projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
rsxx: Fix possible kernel panic with invalid config.
[deliverable/linux.git] / drivers / block / skd_main.c
CommitLineData
e67f86b3
AB		 1/* Copyright 2012 STEC, Inc.
2 *
3 * This file is licensed under the terms of the 3-clause
4 * BSD License (http://opensource.org/licenses/BSD-3-Clause)
5 * or the GNU GPL-2.0 (http://www.gnu.org/licenses/gpl-2.0.html),
6 * at your option. Both licenses are also available in the LICENSE file
7 * distributed with this project. This file may not be copied, modified,
8 * or distributed except in accordance with those terms.
9 * Gordoni Waidhofer <gwaidhofer@stec-inc.com>
10 * Initial Driver Design!
11 * Thomas Swann <tswann@stec-inc.com>
12 * Interrupt handling.
13 * Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
14 * biomode implementation.
15 * Akhil Bhansali <abhansali@stec-inc.com>
16 * Added support for DISCARD / FLUSH and FUA.
17 */
18
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/pci.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25#include <linux/blkdev.h>
26#include <linux/sched.h>
27#include <linux/interrupt.h>
28#include <linux/compiler.h>
29#include <linux/workqueue.h>
30#include <linux/bitops.h>
31#include <linux/delay.h>
32#include <linux/time.h>
33#include <linux/hdreg.h>
34#include <linux/dma-mapping.h>
35#include <linux/completion.h>
36#include <linux/scatterlist.h>
37#include <linux/version.h>
38#include <linux/err.h>
39#include <linux/scatterlist.h>
40#include <linux/aer.h>
41#include <linux/ctype.h>
42#include <linux/wait.h>
43#include <linux/uio.h>
44#include <scsi/scsi.h>
45#include <scsi/scsi_host.h>
46#include <scsi/scsi_tcq.h>
47#include <scsi/scsi_cmnd.h>
48#include <scsi/sg.h>
49#include <linux/io.h>
50#include <linux/uaccess.h>
51#include <asm-generic/unaligned.h>
52
53#include "skd_s1120.h"
54
55static int skd_dbg_level;
56static int skd_isr_comp_limit = 4;
57
58enum {
59 STEC_LINK_2_5GTS = 0,
60 STEC_LINK_5GTS = 1,
61 STEC_LINK_8GTS = 2,
62 STEC_LINK_UNKNOWN = 0xFF
63};
64
65enum {
66 SKD_FLUSH_INITIALIZER,
67 SKD_FLUSH_ZERO_SIZE_FIRST,
68 SKD_FLUSH_DATA_SECOND,
69};
70
71#define DPRINTK(skdev, fmt, args ...) \
72 do { \
73 if (unlikely((skdev)->dbg_level > 0)) { \
74 pr_err("%s:%s:%d " fmt, (skdev)->name, \
75 __func__, __LINE__, ## args); \
76 } \
77 } while (0)
78
79#define SKD_ASSERT(expr) \
80 do { \
81 if (unlikely(!(expr))) { \
82 pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
83 # expr, __FILE__, __func__, __LINE__); \
84 } \
85 } while (0)
86
87#define VPRINTK(skdev, fmt, args ...) \
88 do { \
89 if (unlikely((skdev)->dbg_level > 1)) { \
90 pr_err("%s:%s:%d " fmt, (skdev)->name, \
91 __func__, __LINE__, ## args); \
92 } \
93 } while (0)
94
95
96#define DRV_NAME "skd"
97#define DRV_VERSION "2.2.1"
98#define DRV_BUILD_ID "0260"
99#define PFX DRV_NAME ": "
100#define DRV_BIN_VERSION 0x100
101#define DRV_VER_COMPL "2.2.1." DRV_BUILD_ID
102
103MODULE_AUTHOR("bug-reports: support@stec-inc.com");
104MODULE_LICENSE("Dual BSD/GPL");
105
106MODULE_DESCRIPTION("STEC s1120 PCIe SSD block/BIO driver (b" DRV_BUILD_ID ")");
107MODULE_VERSION(DRV_VERSION "-" DRV_BUILD_ID);
108
109#define PCI_VENDOR_ID_STEC 0x1B39
110#define PCI_DEVICE_ID_S1120 0x0001
111
112#define SKD_FUA_NV (1 << 1)
113#define SKD_MINORS_PER_DEVICE 16
114
115#define SKD_MAX_QUEUE_DEPTH 200u
116
117#define SKD_PAUSE_TIMEOUT (5 * 1000)
118
119#define SKD_N_FITMSG_BYTES (512u)
120
121#define SKD_N_SPECIAL_CONTEXT 32u
122#define SKD_N_SPECIAL_FITMSG_BYTES (128u)
123
124/* SG elements are 32 bytes, so we can make this 4096 and still be under the
125 * 128KB limit. That allows 4096*4K = 16M xfer size
126 */
127#define SKD_N_SG_PER_REQ_DEFAULT 256u
128#define SKD_N_SG_PER_SPECIAL 256u
129
130#define SKD_N_COMPLETION_ENTRY 256u
131#define SKD_N_READ_CAP_BYTES (8u)
132
133#define SKD_N_INTERNAL_BYTES (512u)
134
135/* 5 bits of uniqifier, 0xF800 */
136#define SKD_ID_INCR (0x400)
137#define SKD_ID_TABLE_MASK (3u << 8u)
138#define SKD_ID_RW_REQUEST (0u << 8u)
139#define SKD_ID_INTERNAL (1u << 8u)
140#define SKD_ID_SPECIAL_REQUEST (2u << 8u)
141#define SKD_ID_FIT_MSG (3u << 8u)
142#define SKD_ID_SLOT_MASK 0x00FFu
143#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
144
145#define SKD_N_TIMEOUT_SLOT 4u
146#define SKD_TIMEOUT_SLOT_MASK 3u
147
148#define SKD_N_MAX_SECTORS 2048u
149
150#define SKD_MAX_RETRIES 2u
151
152#define SKD_TIMER_SECONDS(seconds) (seconds)
153#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
154
155#define INQ_STD_NBYTES 36
156#define SKD_DISCARD_CDB_LENGTH 24
157
158enum skd_drvr_state {
159 SKD_DRVR_STATE_LOAD,
160 SKD_DRVR_STATE_IDLE,
161 SKD_DRVR_STATE_BUSY,
162 SKD_DRVR_STATE_STARTING,
163 SKD_DRVR_STATE_ONLINE,
164 SKD_DRVR_STATE_PAUSING,
165 SKD_DRVR_STATE_PAUSED,
166 SKD_DRVR_STATE_DRAINING_TIMEOUT,
167 SKD_DRVR_STATE_RESTARTING,
168 SKD_DRVR_STATE_RESUMING,
169 SKD_DRVR_STATE_STOPPING,
170 SKD_DRVR_STATE_FAULT,
171 SKD_DRVR_STATE_DISAPPEARED,
172 SKD_DRVR_STATE_PROTOCOL_MISMATCH,
173 SKD_DRVR_STATE_BUSY_ERASE,
174 SKD_DRVR_STATE_BUSY_SANITIZE,
175 SKD_DRVR_STATE_BUSY_IMMINENT,
176 SKD_DRVR_STATE_WAIT_BOOT,
177 SKD_DRVR_STATE_SYNCING,
178};
179
180#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
181#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
182#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
183#define SKD_DRAINING_TIMO SKD_TIMER_SECONDS(6u)
184#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
185#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
186#define SKD_START_WAIT_SECONDS 90u
187
188enum skd_req_state {
189 SKD_REQ_STATE_IDLE,
190 SKD_REQ_STATE_SETUP,
191 SKD_REQ_STATE_BUSY,
192 SKD_REQ_STATE_COMPLETED,
193 SKD_REQ_STATE_TIMEOUT,
194 SKD_REQ_STATE_ABORTED,
195};
196
197enum skd_fit_msg_state {
198 SKD_MSG_STATE_IDLE,
199 SKD_MSG_STATE_BUSY,
200};
201
202enum skd_check_status_action {
203 SKD_CHECK_STATUS_REPORT_GOOD,
204 SKD_CHECK_STATUS_REPORT_SMART_ALERT,
205 SKD_CHECK_STATUS_REQUEUE_REQUEST,
206 SKD_CHECK_STATUS_REPORT_ERROR,
207 SKD_CHECK_STATUS_BUSY_IMMINENT,
208};
209
210struct skd_fitmsg_context {
211 enum skd_fit_msg_state state;
212
213 struct skd_fitmsg_context *next;
214
215 u32 id;
216 u16 outstanding;
217
218 u32 length;
219 u32 offset;
220
221 u8 *msg_buf;
222 dma_addr_t mb_dma_address;
223};
224
225struct skd_request_context {
226 enum skd_req_state state;
227
228 struct skd_request_context *next;
229
230 u16 id;
231 u32 fitmsg_id;
232
233 struct request *req;
234 struct bio *bio;
235 unsigned long start_time;
236 u8 flush_cmd;
237 u8 discard_page;
238
239 u32 timeout_stamp;
240 u8 sg_data_dir;
241 struct scatterlist *sg;
242 u32 n_sg;
243 u32 sg_byte_count;
244
245 struct fit_sg_descriptor *sksg_list;
246 dma_addr_t sksg_dma_address;
247
248 struct fit_completion_entry_v1 completion;
249
250 struct fit_comp_error_info err_info;
251
252};
253#define SKD_DATA_DIR_HOST_TO_CARD 1
254#define SKD_DATA_DIR_CARD_TO_HOST 2
255#define SKD_DATA_DIR_NONE 3 /* especially for DISCARD requests. */
256
257struct skd_special_context {
258 struct skd_request_context req;
259
260 u8 orphaned;
261
262 void *data_buf;
263 dma_addr_t db_dma_address;
264
265 u8 *msg_buf;
266 dma_addr_t mb_dma_address;
267};
268
269struct skd_sg_io {
270 fmode_t mode;
271 void __user *argp;
272
273 struct sg_io_hdr sg;
274
275 u8 cdb[16];
276
277 u32 dxfer_len;
278 u32 iovcnt;
279 struct sg_iovec *iov;
280 struct sg_iovec no_iov_iov;
281
282 struct skd_special_context *skspcl;
283};
284
285typedef enum skd_irq_type {
286 SKD_IRQ_LEGACY,
287 SKD_IRQ_MSI,
288 SKD_IRQ_MSIX
289} skd_irq_type_t;
290
291#define SKD_MAX_BARS 2
292
293struct skd_device {
294 volatile void __iomem *mem_map[SKD_MAX_BARS];
295 resource_size_t mem_phys[SKD_MAX_BARS];
296 u32 mem_size[SKD_MAX_BARS];
297
298 skd_irq_type_t irq_type;
299 u32 msix_count;
300 struct skd_msix_entry *msix_entries;
301
302 struct pci_dev *pdev;
303 int pcie_error_reporting_is_enabled;
304
305 spinlock_t lock;
306 struct gendisk *disk;
307 struct request_queue *queue;
308 struct device *class_dev;
309 int gendisk_on;
310 int sync_done;
311
312 atomic_t device_count;
313 u32 devno;
314 u32 major;
315 char name[32];
316 char isr_name[30];
317
318 enum skd_drvr_state state;
319 u32 drive_state;
320
321 u32 in_flight;
322 u32 cur_max_queue_depth;
323 u32 queue_low_water_mark;
324 u32 dev_max_queue_depth;
325
326 u32 num_fitmsg_context;
327 u32 num_req_context;
328
329 u32 timeout_slot[SKD_N_TIMEOUT_SLOT];
330 u32 timeout_stamp;
331 struct skd_fitmsg_context *skmsg_free_list;
332 struct skd_fitmsg_context *skmsg_table;
333
334 struct skd_request_context *skreq_free_list;
335 struct skd_request_context *skreq_table;
336
337 struct skd_special_context *skspcl_free_list;
338 struct skd_special_context *skspcl_table;
339
340 struct skd_special_context internal_skspcl;
341 u32 read_cap_blocksize;
342 u32 read_cap_last_lba;
343 int read_cap_is_valid;
344 int inquiry_is_valid;
345 u8 inq_serial_num[13]; /*12 chars plus null term */
346 u8 id_str[80]; /* holds a composite name (pci + sernum) */
347
348 u8 skcomp_cycle;
349 u32 skcomp_ix;
350 struct fit_completion_entry_v1 *skcomp_table;
351 struct fit_comp_error_info *skerr_table;
352 dma_addr_t cq_dma_address;
353
354 wait_queue_head_t waitq;
355
356 struct timer_list timer;
357 u32 timer_countdown;
358 u32 timer_substate;
359
360 int n_special;
361 int sgs_per_request;
362 u32 last_mtd;
363
364 u32 proto_ver;
365
366 int dbg_level;
367 u32 connect_time_stamp;
368 int connect_retries;
369#define SKD_MAX_CONNECT_RETRIES 16
370 u32 drive_jiffies;
371
372 u32 timo_slot;
373
374
375 struct work_struct completion_worker;
376
377 struct bio_list bio_queue;
378 int queue_stopped;
379
380 struct list_head flush_list;
381};
382
383#define SKD_FLUSH_JOB "skd-flush-jobs"
384struct kmem_cache *skd_flush_slab;
385
386/*
387 * These commands hold "nonzero size FLUSH bios",
388 * which are enqueud in skdev->flush_list during
389 * completion of "zero size FLUSH commands".
390 * It will be active in biomode.
391 */
392struct skd_flush_cmd {
393 void *cmd;
394 struct list_head flist;
395};
396
397#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
398#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
399#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
400
401static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
402{
403 u32 val;
404
405 if (likely(skdev->dbg_level < 2))
406 return readl(skdev->mem_map[1] + offset);
407 else {
408 barrier();
409 val = readl(skdev->mem_map[1] + offset);
410 barrier();
411 VPRINTK(skdev, "offset %x = %x\n", offset, val);
412 return val;
413 }
414
415}
416
417static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
418 u32 offset)
419{
420 if (likely(skdev->dbg_level < 2)) {
421 writel(val, skdev->mem_map[1] + offset);
422 barrier();
423 readl(skdev->mem_map[1] + offset);
424 barrier();
425 } else {
426 barrier();
427 writel(val, skdev->mem_map[1] + offset);
428 barrier();
429 readl(skdev->mem_map[1] + offset);
430 barrier();
431 VPRINTK(skdev, "offset %x = %x\n", offset, val);
432 }
433}
434
435static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
436 u32 offset)
437{
438 if (likely(skdev->dbg_level < 2)) {
439 writeq(val, skdev->mem_map[1] + offset);
440 barrier();
441 readq(skdev->mem_map[1] + offset);
442 barrier();
443 } else {
444 barrier();
445 writeq(val, skdev->mem_map[1] + offset);
446 barrier();
447 readq(skdev->mem_map[1] + offset);
448 barrier();
449 VPRINTK(skdev, "offset %x = %016llx\n", offset, val);
450 }
451}
452
453
454#define SKD_IRQ_DEFAULT SKD_IRQ_MSI
455static int skd_isr_type = SKD_IRQ_DEFAULT;
456
457module_param(skd_isr_type, int, 0444);
458MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
459 " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
460
461#define SKD_MAX_REQ_PER_MSG_DEFAULT 1
462static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
463
464module_param(skd_max_req_per_msg, int, 0444);
465MODULE_PARM_DESC(skd_max_req_per_msg,
466 "Maximum SCSI requests packed in a single message."
467 " (1-14, default==1)");
468
469#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
470#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
471static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
472
473module_param(skd_max_queue_depth, int, 0444);
474MODULE_PARM_DESC(skd_max_queue_depth,
475 "Maximum SCSI requests issued to s1120."
476 " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
477
478static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
479module_param(skd_sgs_per_request, int, 0444);
480MODULE_PARM_DESC(skd_sgs_per_request,
481 "Maximum SG elements per block request."
482 " (1-4096, default==256)");
483
484static int skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
485module_param(skd_max_pass_thru, int, 0444);
486MODULE_PARM_DESC(skd_max_pass_thru,
487 "Maximum SCSI pass-thru at a time." " (1-50, default==32)");
488
489module_param(skd_dbg_level, int, 0444);
490MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
491
492module_param(skd_isr_comp_limit, int, 0444);
493MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
494
495static int skd_bio;
496module_param(skd_bio, int, 0444);
497MODULE_PARM_DESC(skd_bio,
498 "Register as a bio device instead of block (0, 1) default=0");
499
500/* Major device number dynamically assigned. */
501static u32 skd_major;
502
503static struct skd_device *skd_construct(struct pci_dev *pdev);
504static void skd_destruct(struct skd_device *skdev);
505static const struct block_device_operations skd_blockdev_ops;
506static void skd_send_fitmsg(struct skd_device *skdev,
507 struct skd_fitmsg_context *skmsg);
508static void skd_send_special_fitmsg(struct skd_device *skdev,
509 struct skd_special_context *skspcl);
510static void skd_request_fn(struct request_queue *rq);
511static void skd_end_request(struct skd_device *skdev,
512 struct skd_request_context *skreq, int error);
513static int skd_preop_sg_list(struct skd_device *skdev,
514 struct skd_request_context *skreq);
515static void skd_postop_sg_list(struct skd_device *skdev,
516 struct skd_request_context *skreq);
517
518static void skd_restart_device(struct skd_device *skdev);
519static int skd_quiesce_dev(struct skd_device *skdev);
520static int skd_unquiesce_dev(struct skd_device *skdev);
521static void skd_release_special(struct skd_device *skdev,
522 struct skd_special_context *skspcl);
523static void skd_disable_interrupts(struct skd_device *skdev);
524static void skd_isr_fwstate(struct skd_device *skdev);
525static void skd_recover_requests(struct skd_device *skdev, int requeue);
526static void skd_soft_reset(struct skd_device *skdev);
527
528static const char *skd_name(struct skd_device *skdev);
529const char *skd_drive_state_to_str(int state);
530const char *skd_skdev_state_to_str(enum skd_drvr_state state);
531static void skd_log_skdev(struct skd_device *skdev, const char *event);
532static void skd_log_skmsg(struct skd_device *skdev,
533 struct skd_fitmsg_context *skmsg, const char *event);
534static void skd_log_skreq(struct skd_device *skdev,
535 struct skd_request_context *skreq, const char *event);
536
537/* FLUSH FUA flag handling. */
538static int skd_flush_cmd_enqueue(struct skd_device *, void *);
539static void *skd_flush_cmd_dequeue(struct skd_device *);
540
541
542/*
543 *****************************************************************************
544 * READ/WRITE REQUESTS
545 *****************************************************************************
546 */
547static void skd_stop_queue(struct skd_device *skdev)
548{
549 if (!skd_bio)
550 blk_stop_queue(skdev->queue);
551 else
552 skdev->queue_stopped = 1;
553}
554
555static void skd_unstop_queue(struct skd_device *skdev)
556{
557 if (!skd_bio)
558 queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue);
559 else
560 skdev->queue_stopped = 0;
561}
562
563static void skd_start_queue(struct skd_device *skdev)
564{
565 if (!skd_bio) {
566 blk_start_queue(skdev->queue);
567 } else {
568 pr_err("(%s): Starting queue\n", skd_name(skdev));
569 skdev->queue_stopped = 0;
570 skd_request_fn(skdev->queue);
571 }
572}
573
574static int skd_queue_stopped(struct skd_device *skdev)
575{
576 if (!skd_bio)
577 return blk_queue_stopped(skdev->queue);
578 else
579 return skdev->queue_stopped;
580}
581
582static void skd_fail_all_pending_blk(struct skd_device *skdev)
583{
584 struct request_queue *q = skdev->queue;
585 struct request *req;
586
587 for (;; ) {
588 req = blk_peek_request(q);
589 if (req == NULL)
590 break;
591 blk_start_request(req);
592 __blk_end_request_all(req, -EIO);
593 }
594}
595
596static void skd_fail_all_pending_bio(struct skd_device *skdev)
597{
598 struct bio *bio;
599 int error = -EIO;
600
601 for (;; ) {
602 bio = bio_list_pop(&skdev->bio_queue);
603
604 if (bio == NULL)
605 break;
606
607 bio_endio(bio, error);
608 }
609}
610
611static void skd_fail_all_pending(struct skd_device *skdev)
612{
613 if (!skd_bio)
614 skd_fail_all_pending_blk(skdev);
615 else
616 skd_fail_all_pending_bio(skdev);
617}
618
619static void skd_make_request(struct request_queue *q, struct bio *bio)
620{
621 struct skd_device *skdev = q->queuedata;
622 unsigned long flags;
623
624 spin_lock_irqsave(&skdev->lock, flags);
625
626 bio_list_add(&skdev->bio_queue, bio);
627 skd_request_fn(skdev->queue);
628
629 spin_unlock_irqrestore(&skdev->lock, flags);
630}
631
632static void
633skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
634 int data_dir, unsigned lba,
635 unsigned count)
636{
637 if (data_dir == READ)
638 scsi_req->cdb[0] = 0x28;
639 else
640 scsi_req->cdb[0] = 0x2a;
641
642 scsi_req->cdb[1] = 0;
643 scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
644 scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
645 scsi_req->cdb[4] = (lba & 0xff00) >> 8;
646 scsi_req->cdb[5] = (lba & 0xff);
647 scsi_req->cdb[6] = 0;
648 scsi_req->cdb[7] = (count & 0xff00) >> 8;
649 scsi_req->cdb[8] = count & 0xff;
650 scsi_req->cdb[9] = 0;
651}
652
653static void
654skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
655 struct skd_request_context *skreq)
656{
657 skreq->flush_cmd = 1;
658
659 scsi_req->cdb[0] = 0x35;
660 scsi_req->cdb[1] = 0;
661 scsi_req->cdb[2] = 0;
662 scsi_req->cdb[3] = 0;
663 scsi_req->cdb[4] = 0;
664 scsi_req->cdb[5] = 0;
665 scsi_req->cdb[6] = 0;
666 scsi_req->cdb[7] = 0;
667 scsi_req->cdb[8] = 0;
668 scsi_req->cdb[9] = 0;
669}
670
671static void
672skd_prep_discard_cdb(struct skd_scsi_request *scsi_req,
673 struct skd_request_context *skreq,
674 struct page *page,
675 u32 lba, u32 count)
676{
677 char *buf;
678 unsigned long len;
679 struct request *req;
680
681 buf = page_address(page);
682 len = SKD_DISCARD_CDB_LENGTH;
683
684 scsi_req->cdb[0] = UNMAP;
685 scsi_req->cdb[8] = len;
686
687 put_unaligned_be16(6 + 16, &buf[0]);
688 put_unaligned_be16(16, &buf[2]);
689 put_unaligned_be64(lba, &buf[8]);
690 put_unaligned_be32(count, &buf[16]);
691
692 if (!skd_bio) {
693 req = skreq->req;
694 blk_add_request_payload(req, page, len);
695 req->buffer = buf;
696 } else {
697 skreq->bio->bi_io_vec->bv_page = page;
698 skreq->bio->bi_io_vec->bv_offset = 0;
699 skreq->bio->bi_io_vec->bv_len = len;
700
701 skreq->bio->bi_vcnt = 1;
702 skreq->bio->bi_phys_segments = 1;
703 }
704}
705
706static void skd_request_fn_not_online(struct request_queue *q);
707
708static void skd_request_fn(struct request_queue *q)
709{
710 struct skd_device *skdev = q->queuedata;
711 struct skd_fitmsg_context *skmsg = NULL;
712 struct fit_msg_hdr *fmh = NULL;
713 struct skd_request_context *skreq;
714 struct request *req = NULL;
715 struct bio *bio = NULL;
716 struct skd_scsi_request *scsi_req;
717 struct page *page;
718 unsigned long io_flags;
719 int error;
720 u32 lba;
721 u32 count;
722 int data_dir;
723 u32 be_lba;
724 u32 be_count;
725 u64 be_dmaa;
726 u64 cmdctxt;
727 u32 timo_slot;
728 void *cmd_ptr;
729 int flush, fua;
730
731 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
732 skd_request_fn_not_online(q);
733 return;
734 }
735
736 if (skd_queue_stopped(skdev)) {
737 if (skdev->skmsg_free_list == NULL ||
738 skdev->skreq_free_list == NULL ||
739 skdev->in_flight >= skdev->queue_low_water_mark)
740 /* There is still some kind of shortage */
741 return;
742
743 skd_unstop_queue(skdev);
744 }
745
746 /*
747 * Stop conditions:
748 * - There are no more native requests
749 * - There are already the maximum number of requests in progress
750 * - There are no more skd_request_context entries
751 * - There are no more FIT msg buffers
752 */
753 for (;; ) {
754
755 flush = fua = 0;
756
757 if (!skd_bio) {
758 req = blk_peek_request(q);
759
760 /* Are there any native requests to start? */
761 if (req == NULL)
762 break;
763
764 lba = (u32)blk_rq_pos(req);
765 count = blk_rq_sectors(req);
766 data_dir = rq_data_dir(req);
767 io_flags = req->cmd_flags;
768
769 if (io_flags & REQ_FLUSH)
770 flush++;
771
772 if (io_flags & REQ_FUA)
773 fua++;
774
775 VPRINTK(skdev,
776 "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
777 req, lba, lba, count, count, data_dir);
778 } else {
779 if (!list_empty(&skdev->flush_list)) {
780 /* Process data part of FLUSH request. */
781 bio = (struct bio *)skd_flush_cmd_dequeue(skdev);
782 flush++;
783 VPRINTK(skdev, "processing FLUSH request with data.\n");
784 } else {
785 /* peek at our bio queue */
786 bio = bio_list_peek(&skdev->bio_queue);
787 }
788
789 /* Are there any native requests to start? */
790 if (bio == NULL)
791 break;
792
793 lba = (u32)bio->bi_sector;
794 count = bio_sectors(bio);
795 data_dir = bio_data_dir(bio);
796 io_flags = bio->bi_rw;
797
798 VPRINTK(skdev,
799 "new bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
800 bio, lba, lba, count, count, data_dir);
801
802 if (io_flags & REQ_FLUSH)
803 flush++;
804
805 if (io_flags & REQ_FUA)
806 fua++;
807 }
808
809 /* At this point we know there is a request
810 * (from our bio q or req q depending on the way
811 * the driver is built do checks for resources.
812 */
813
814 /* Are too many requets already in progress? */
815 if (skdev->in_flight >= skdev->cur_max_queue_depth) {
816 VPRINTK(skdev, "qdepth %d, limit %d\n",
817 skdev->in_flight, skdev->cur_max_queue_depth);
818 break;
819 }
820
821 /* Is a skd_request_context available? */
822 skreq = skdev->skreq_free_list;
823 if (skreq == NULL) {
824 VPRINTK(skdev, "Out of req=%p\n", q);
825 break;
826 }
827 SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
828 SKD_ASSERT((skreq->id & SKD_ID_INCR) == 0);
829
830 /* Now we check to see if we can get a fit msg */
831 if (skmsg == NULL) {
832 if (skdev->skmsg_free_list == NULL) {
833 VPRINTK(skdev, "Out of msg\n");
834 break;
835 }
836 }
837
838 skreq->flush_cmd = 0;
839 skreq->n_sg = 0;
840 skreq->sg_byte_count = 0;
841 skreq->discard_page = 0;
842
843 /*
844 * OK to now dequeue request from either bio or q.
845 *
846 * At this point we are comitted to either start or reject
847 * the native request. Note that skd_request_context is
848 * available but is still at the head of the free list.
849 */
850 if (!skd_bio) {
851 blk_start_request(req);
852 skreq->req = req;
853 skreq->fitmsg_id = 0;
854 } else {
855 if (unlikely(flush == SKD_FLUSH_DATA_SECOND)) {
856 skreq->bio = bio;
857 } else {
858 skreq->bio = bio_list_pop(&skdev->bio_queue);
859 SKD_ASSERT(skreq->bio == bio);
860 skreq->start_time = jiffies;
861 part_inc_in_flight(&skdev->disk->part0,
862 bio_data_dir(bio));
863 }
864
865 skreq->fitmsg_id = 0;
866 }
867
868 /* Either a FIT msg is in progress or we have to start one. */
869 if (skmsg == NULL) {
870 /* Are there any FIT msg buffers available? */
871 skmsg = skdev->skmsg_free_list;
872 if (skmsg == NULL) {
873 VPRINTK(skdev, "Out of msg skdev=%p\n", skdev);
874 break;
875 }
876 SKD_ASSERT(skmsg->state == SKD_MSG_STATE_IDLE);
877 SKD_ASSERT((skmsg->id & SKD_ID_INCR) == 0);
878
879 skdev->skmsg_free_list = skmsg->next;
880
881 skmsg->state = SKD_MSG_STATE_BUSY;
882 skmsg->id += SKD_ID_INCR;
883
884 /* Initialize the FIT msg header */
885 fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
886 memset(fmh, 0, sizeof(*fmh));
887 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
888 skmsg->length = sizeof(*fmh);
889 }
890
891 skreq->fitmsg_id = skmsg->id;
892
893 /*
894 * Note that a FIT msg may have just been started
895 * but contains no SoFIT requests yet.
896 */
897
898 /*
899 * Transcode the request, checking as we go. The outcome of
900 * the transcoding is represented by the error variable.
901 */
902 cmd_ptr = &skmsg->msg_buf[skmsg->length];
903 memset(cmd_ptr, 0, 32);
904
905 be_lba = cpu_to_be32(lba);
906 be_count = cpu_to_be32(count);
907 be_dmaa = cpu_to_be64((u64)skreq->sksg_dma_address);
908 cmdctxt = skreq->id + SKD_ID_INCR;
909
910 scsi_req = cmd_ptr;
911 scsi_req->hdr.tag = cmdctxt;
912 scsi_req->hdr.sg_list_dma_address = be_dmaa;
913
914 if (data_dir == READ)
915 skreq->sg_data_dir = SKD_DATA_DIR_CARD_TO_HOST;
916 else
917 skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD;
918
919 if (io_flags & REQ_DISCARD) {
920 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
921 if (!page) {
922 pr_err("request_fn:Page allocation failed.\n");
923 skd_end_request(skdev, skreq, -ENOMEM);
924 break;
925 }
926 skreq->discard_page = 1;
927 skd_prep_discard_cdb(scsi_req, skreq, page, lba, count);
928
929 } else if (flush == SKD_FLUSH_ZERO_SIZE_FIRST) {
930 skd_prep_zerosize_flush_cdb(scsi_req, skreq);
931 SKD_ASSERT(skreq->flush_cmd == 1);
932
933 } else {
934 skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
935 }
936
937 if (fua)
938 scsi_req->cdb[1] |= SKD_FUA_NV;
939
940 if ((!skd_bio && !req->bio) ||
941 (skd_bio && flush == SKD_FLUSH_ZERO_SIZE_FIRST))
942 goto skip_sg;
943
944 error = skd_preop_sg_list(skdev, skreq);
945
946 if (error != 0) {
947 /*
948 * Complete the native request with error.
949 * Note that the request context is still at the
950 * head of the free list, and that the SoFIT request
951 * was encoded into the FIT msg buffer but the FIT
952 * msg length has not been updated. In short, the
953 * only resource that has been allocated but might
954 * not be used is that the FIT msg could be empty.
955 */
956 DPRINTK(skdev, "error Out\n");
957 skd_end_request(skdev, skreq, error);
958 continue;
959 }
960
961skip_sg:
962 scsi_req->hdr.sg_list_len_bytes =
963 cpu_to_be32(skreq->sg_byte_count);
964
965 /* Complete resource allocations. */
966 skdev->skreq_free_list = skreq->next;
967 skreq->state = SKD_REQ_STATE_BUSY;
968 skreq->id += SKD_ID_INCR;
969
970 skmsg->length += sizeof(struct skd_scsi_request);
971 fmh->num_protocol_cmds_coalesced++;
972
973 /*
974 * Update the active request counts.
975 * Capture the timeout timestamp.
976 */
977 skreq->timeout_stamp = skdev->timeout_stamp;
978 timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
979 skdev->timeout_slot[timo_slot]++;
980 skdev->in_flight++;
981 VPRINTK(skdev, "req=0x%x busy=%d\n",
982 skreq->id, skdev->in_flight);
983
984 /*
985 * If the FIT msg buffer is full send it.
986 */
987 if (skmsg->length >= SKD_N_FITMSG_BYTES ||
988 fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
989 skd_send_fitmsg(skdev, skmsg);
990 skmsg = NULL;
991 fmh = NULL;
992 }
993 }
994
995 /*
996 * Is a FIT msg in progress? If it is empty put the buffer back
997 * on the free list. If it is non-empty send what we got.
998 * This minimizes latency when there are fewer requests than
999 * what fits in a FIT msg.
1000 */
1001 if (skmsg != NULL) {
1002 /* Bigger than just a FIT msg header? */
1003 if (skmsg->length > sizeof(struct fit_msg_hdr)) {
1004 VPRINTK(skdev, "sending msg=%p, len %d\n",
1005 skmsg, skmsg->length);
1006 skd_send_fitmsg(skdev, skmsg);
1007 } else {
1008 /*
1009 * The FIT msg is empty. It means we got started
1010 * on the msg, but the requests were rejected.
1011 */
1012 skmsg->state = SKD_MSG_STATE_IDLE;
1013 skmsg->id += SKD_ID_INCR;
1014 skmsg->next = skdev->skmsg_free_list;
1015 skdev->skmsg_free_list = skmsg;
1016 }
1017 skmsg = NULL;
1018 fmh = NULL;
1019 }
1020
1021 /*
1022 * If req is non-NULL it means there is something to do but
1023 * we are out of a resource.
1024 */
1025 if (((!skd_bio) && req) ||
1026 ((skd_bio) && bio_list_peek(&skdev->bio_queue)))
1027 skd_stop_queue(skdev);
1028}
1029
1030static void skd_end_request_blk(struct skd_device *skdev,
1031 struct skd_request_context *skreq, int error)
1032{
1033 struct request *req = skreq->req;
1034 unsigned int io_flags = req->cmd_flags;
1035
1036 if ((io_flags & REQ_DISCARD) &&
1037 (skreq->discard_page == 1)) {
1038 VPRINTK(skdev, "skd_end_request_blk, free the page!");
1039 free_page((unsigned long)req->buffer);
1040 req->buffer = NULL;
1041 }
1042
1043 if (unlikely(error)) {
1044 struct request *req = skreq->req;
1045 char *cmd = (rq_data_dir(req) == READ) ? "read" : "write";
1046 u32 lba = (u32)blk_rq_pos(req);
1047 u32 count = blk_rq_sectors(req);
1048
1049 pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
1050 skd_name(skdev), cmd, lba, count, skreq->id);
1051 } else
1052 VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
1053
1054 __blk_end_request_all(skreq->req, error);
1055}
1056
1057static int skd_preop_sg_list_blk(struct skd_device *skdev,
1058 struct skd_request_context *skreq)
1059{
1060 struct request *req = skreq->req;
1061 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1062 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1063 struct scatterlist *sg = &skreq->sg[0];
1064 int n_sg;
1065 int i;
1066
1067 skreq->sg_byte_count = 0;
1068
1069 /* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD ||
1070 skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */
1071
1072 n_sg = blk_rq_map_sg(skdev->queue, req, sg);
1073 if (n_sg <= 0)
1074 return -EINVAL;
1075
1076 /*
1077 * Map scatterlist to PCI bus addresses.
1078 * Note PCI might change the number of entries.
1079 */
1080 n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir);
1081 if (n_sg <= 0)
1082 return -EINVAL;
1083
1084 SKD_ASSERT(n_sg <= skdev->sgs_per_request);
1085
1086 skreq->n_sg = n_sg;
1087
1088 for (i = 0; i < n_sg; i++) {
1089 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1090 u32 cnt = sg_dma_len(&sg[i]);
1091 uint64_t dma_addr = sg_dma_address(&sg[i]);
1092
1093 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
1094 sgd->byte_count = cnt;
1095 skreq->sg_byte_count += cnt;
1096 sgd->host_side_addr = dma_addr;
1097 sgd->dev_side_addr = 0;
1098 }
1099
1100 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
1101 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
1102
1103 if (unlikely(skdev->dbg_level > 1)) {
1104 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1105 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1106 for (i = 0; i < n_sg; i++) {
1107 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1108 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1109 "addr=0x%llx next=0x%llx\n",
1110 i, sgd->byte_count, sgd->control,
1111 sgd->host_side_addr, sgd->next_desc_ptr);
1112 }
1113 }
1114
1115 return 0;
1116}
1117
1118static void skd_postop_sg_list_blk(struct skd_device *skdev,
1119 struct skd_request_context *skreq)
1120{
1121 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1122 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1123
1124 /*
1125 * restore the next ptr for next IO request so we
1126 * don't have to set it every time.
1127 */
1128 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
1129 skreq->sksg_dma_address +
1130 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
1131 pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir);
1132}
1133
1134static void skd_end_request_bio(struct skd_device *skdev,
1135 struct skd_request_context *skreq, int error)
1136{
1137 struct bio *bio = skreq->bio;
1138 int rw = bio_data_dir(bio);
1139 unsigned long io_flags = bio->bi_rw;
1140
1141 if ((io_flags & REQ_DISCARD) &&
1142 (skreq->discard_page == 1)) {
1143 VPRINTK(skdev, "biomode: skd_end_request: freeing DISCARD page.\n");
1144 free_page((unsigned long)page_address(bio->bi_io_vec->bv_page));
1145 }
1146
1147 if (unlikely(error)) {
1148 u32 lba = (u32)skreq->bio->bi_sector;
1149 u32 count = bio_sectors(skreq->bio);
1150 char *cmd = (rw == WRITE) ? "write" : "read";
1151 pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
1152 skd_name(skdev), cmd, lba, count, skreq->id);
1153 }
1154 {
1155 int cpu = part_stat_lock();
1156
1157 if (likely(!error)) {
1158 part_stat_inc(cpu, &skdev->disk->part0, ios[rw]);
1159 part_stat_add(cpu, &skdev->disk->part0, sectors[rw],
1160 bio_sectors(bio));
1161 }
1162 part_stat_add(cpu, &skdev->disk->part0, ticks[rw],
1163 jiffies - skreq->start_time);
1164 part_dec_in_flight(&skdev->disk->part0, rw);
1165 part_stat_unlock();
1166 }
1167
1168 VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
1169
1170 bio_endio(skreq->bio, error);
1171}
1172
1173static int skd_preop_sg_list_bio(struct skd_device *skdev,
1174 struct skd_request_context *skreq)
1175{
1176 struct bio *bio = skreq->bio;
1177 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1178 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1179 int n_sg;
1180 int i;
1181 struct bio_vec *vec;
1182 struct fit_sg_descriptor *sgd;
1183 u64 dma_addr;
1184 u32 count;
1185 int errs = 0;
1186 unsigned int io_flags = 0;
1187 io_flags |= bio->bi_rw;
1188
1189 skreq->sg_byte_count = 0;
1190 n_sg = skreq->n_sg = skreq->bio->bi_vcnt;
1191
1192 if (n_sg <= 0)
1193 return -EINVAL;
1194
1195 if (n_sg > skdev->sgs_per_request) {
1196 pr_err("(%s): sg overflow n=%d\n",
1197 skd_name(skdev), n_sg);
1198 skreq->n_sg = 0;
1199 return -EIO;
1200 }
1201
1202 for (i = 0; i < skreq->n_sg; i++) {
1203 vec = bio_iovec_idx(bio, i);
1204 dma_addr = pci_map_page(skdev->pdev,
1205 vec->bv_page,
1206 vec->bv_offset, vec->bv_len, pci_dir);
1207 count = vec->bv_len;
1208
1209 if (count == 0 || count > 64u * 1024u || (count & 3) != 0
1210 || (dma_addr & 3) != 0) {
1211 pr_err(
1212 "(%s): Bad sg ix=%d count=%d addr=0x%llx\n",
1213 skd_name(skdev), i, count, dma_addr);
1214 errs++;
1215 }
1216
1217 sgd = &skreq->sksg_list[i];
1218
1219 sgd->control = FIT_SGD_CONTROL_NOT_LAST;
1220 sgd->byte_count = vec->bv_len;
1221 skreq->sg_byte_count += vec->bv_len;
1222 sgd->host_side_addr = dma_addr;
1223 sgd->dev_side_addr = 0; /* not used */
1224 }
1225
1226 skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
1227 skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
1228
1229
1230 if (!(io_flags & REQ_DISCARD)) {
1231 count = bio_sectors(bio) << 9u;
1232 if (count != skreq->sg_byte_count) {
1233 pr_err("(%s): mismatch count sg=%d req=%d\n",
1234 skd_name(skdev), skreq->sg_byte_count, count);
1235 errs++;
1236 }
1237 }
1238
1239 if (unlikely(skdev->dbg_level > 1)) {
1240 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1241 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1242 for (i = 0; i < n_sg; i++) {
1243 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1244 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1245 "addr=0x%llx next=0x%llx\n",
1246 i, sgd->byte_count, sgd->control,
1247 sgd->host_side_addr, sgd->next_desc_ptr);
1248 }
1249 }
1250
1251 if (errs != 0) {
1252 skd_postop_sg_list(skdev, skreq);
1253 skreq->n_sg = 0;
1254 return -EIO;
1255 }
1256
1257 return 0;
1258}
1259
1260static int skd_preop_sg_list(struct skd_device *skdev,
1261 struct skd_request_context *skreq)
1262{
1263 if (!skd_bio)
1264 return skd_preop_sg_list_blk(skdev, skreq);
1265 else
1266 return skd_preop_sg_list_bio(skdev, skreq);
1267}
1268
1269static void skd_postop_sg_list_bio(struct skd_device *skdev,
1270 struct skd_request_context *skreq)
1271{
1272 int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
1273 int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
1274 int i;
1275 struct fit_sg_descriptor *sgd;
1276
1277 /*
1278 * restore the next ptr for next IO request so we
1279 * don't have to set it every time.
1280 */
1281 skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
1282 skreq->sksg_dma_address +
1283 ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
1284
1285 for (i = 0; i < skreq->n_sg; i++) {
1286 sgd = &skreq->sksg_list[i];
1287 pci_unmap_page(skdev->pdev, sgd->host_side_addr,
1288 sgd->byte_count, pci_dir);
1289 }
1290}
1291
1292static void skd_postop_sg_list(struct skd_device *skdev,
1293 struct skd_request_context *skreq)
1294{
1295 if (!skd_bio)
1296 skd_postop_sg_list_blk(skdev, skreq);
1297 else
1298 skd_postop_sg_list_bio(skdev, skreq);
1299}
1300
1301static void skd_end_request(struct skd_device *skdev,
1302 struct skd_request_context *skreq, int error)
1303{
1304 if (likely(!skd_bio))
1305 skd_end_request_blk(skdev, skreq, error);
1306 else
1307 skd_end_request_bio(skdev, skreq, error);
1308}
1309
1310static void skd_request_fn_not_online(struct request_queue *q)
1311{
1312 struct skd_device *skdev = q->queuedata;
1313 int error;
1314
1315 SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
1316
1317 skd_log_skdev(skdev, "req_not_online");
1318 switch (skdev->state) {
1319 case SKD_DRVR_STATE_PAUSING:
1320 case SKD_DRVR_STATE_PAUSED:
1321 case SKD_DRVR_STATE_STARTING:
1322 case SKD_DRVR_STATE_RESTARTING:
1323 case SKD_DRVR_STATE_WAIT_BOOT:
1324 /* In case of starting, we haven't started the queue,
1325 * so we can't get here... but requests are
1326 * possibly hanging out waiting for us because we
1327 * reported the dev/skd0 already. They'll wait
1328 * forever if connect doesn't complete.
1329 * What to do??? delay dev/skd0 ??
1330 */
1331 case SKD_DRVR_STATE_BUSY:
1332 case SKD_DRVR_STATE_BUSY_IMMINENT:
1333 case SKD_DRVR_STATE_BUSY_ERASE:
1334 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
1335 return;
1336
1337 case SKD_DRVR_STATE_BUSY_SANITIZE:
1338 case SKD_DRVR_STATE_STOPPING:
1339 case SKD_DRVR_STATE_SYNCING:
1340 case SKD_DRVR_STATE_FAULT:
1341 case SKD_DRVR_STATE_DISAPPEARED:
1342 default:
1343 error = -EIO;
1344 break;
1345 }
1346
1347 /* If we get here, terminate all pending block requeusts
1348 * with EIO and any scsi pass thru with appropriate sense
1349 */
1350
1351 skd_fail_all_pending(skdev);
1352}
1353
1354/*
1355 *****************************************************************************
1356 * TIMER
1357 *****************************************************************************
1358 */
1359
1360static void skd_timer_tick_not_online(struct skd_device *skdev);
1361
1362static void skd_timer_tick(ulong arg)
1363{
1364 struct skd_device *skdev = (struct skd_device *)arg;
1365
1366 u32 timo_slot;
1367 u32 overdue_timestamp;
1368 unsigned long reqflags;
1369 u32 state;
1370
1371 if (skdev->state == SKD_DRVR_STATE_FAULT)
1372 /* The driver has declared fault, and we want it to
1373 * stay that way until driver is reloaded.
1374 */
1375 return;
1376
1377 spin_lock_irqsave(&skdev->lock, reqflags);
1378
1379 state = SKD_READL(skdev, FIT_STATUS);
1380 state &= FIT_SR_DRIVE_STATE_MASK;
1381 if (state != skdev->drive_state)
1382 skd_isr_fwstate(skdev);
1383
1384 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
1385 skd_timer_tick_not_online(skdev);
1386 goto timer_func_out;
1387 }
1388 skdev->timeout_stamp++;
1389 timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
1390
1391 /*
1392 * All requests that happened during the previous use of
1393 * this slot should be done by now. The previous use was
1394 * over 7 seconds ago.
1395 */
1396 if (skdev->timeout_slot[timo_slot] == 0)
1397 goto timer_func_out;
1398
1399 /* Something is overdue */
1400 overdue_timestamp = skdev->timeout_stamp - SKD_N_TIMEOUT_SLOT;
1401
1402 DPRINTK(skdev, "found %d timeouts, draining busy=%d\n",
1403 skdev->timeout_slot[timo_slot], skdev->in_flight);
1404 pr_err("(%s): Overdue IOs (%d), busy %d\n",
1405 skd_name(skdev), skdev->timeout_slot[timo_slot],
1406 skdev->in_flight);
1407
1408 skdev->timer_countdown = SKD_DRAINING_TIMO;
1409 skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT;
1410 skdev->timo_slot = timo_slot;
1411 skd_stop_queue(skdev);
1412
1413timer_func_out:
1414 mod_timer(&skdev->timer, (jiffies + HZ));
1415
1416 spin_unlock_irqrestore(&skdev->lock, reqflags);
1417}
1418
1419static void skd_timer_tick_not_online(struct skd_device *skdev)
1420{
1421 switch (skdev->state) {
1422 case SKD_DRVR_STATE_IDLE:
1423 case SKD_DRVR_STATE_LOAD:
1424 break;
1425 case SKD_DRVR_STATE_BUSY_SANITIZE:
1426 VPRINTK(skdev, "drive busy sanitize[%x], driver[%x]\n",
1427 skdev->drive_state, skdev->state);
1428 /* If we've been in sanitize for 3 seconds, we figure we're not
1429 * going to get anymore completions, so recover requests now
1430 */
1431 if (skdev->timer_countdown > 0) {
1432 skdev->timer_countdown--;
1433 return;
1434 }
1435 skd_recover_requests(skdev, 0);
1436 break;
1437
1438 case SKD_DRVR_STATE_BUSY:
1439 case SKD_DRVR_STATE_BUSY_IMMINENT:
1440 case SKD_DRVR_STATE_BUSY_ERASE:
1441 VPRINTK(skdev, "busy[%x], countdown=%d\n",
1442 skdev->state, skdev->timer_countdown);
1443 if (skdev->timer_countdown > 0) {
1444 skdev->timer_countdown--;
1445 return;
1446 }
1447 DPRINTK(skdev, "busy[%x], timedout=%d, restarting device.",
1448 skdev->state, skdev->timer_countdown);
1449 skd_restart_device(skdev);
1450 break;
1451
1452 case SKD_DRVR_STATE_WAIT_BOOT:
1453 case SKD_DRVR_STATE_STARTING:
1454 if (skdev->timer_countdown > 0) {
1455 skdev->timer_countdown--;
1456 return;
1457 }
1458 /* For now, we fault the drive. Could attempt resets to
1459 * revcover at some point. */
1460 skdev->state = SKD_DRVR_STATE_FAULT;
1461
1462 pr_err("(%s): DriveFault Connect Timeout (%x)\n",
1463 skd_name(skdev), skdev->drive_state);
1464
1465 /*start the queue so we can respond with error to requests */
1466 /* wakeup anyone waiting for startup complete */
1467 skd_start_queue(skdev);
1468 skdev->gendisk_on = -1;
1469 wake_up_interruptible(&skdev->waitq);
1470 break;
1471
1472 case SKD_DRVR_STATE_ONLINE:
1473 /* shouldn't get here. */
1474 break;
1475
1476 case SKD_DRVR_STATE_PAUSING:
1477 case SKD_DRVR_STATE_PAUSED:
1478 break;
1479
1480 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
1481 DPRINTK(skdev,
1482 "draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n",
1483 skdev->timo_slot,
1484 skdev->timer_countdown,
1485 skdev->in_flight,
1486 skdev->timeout_slot[skdev->timo_slot]);
1487 /* if the slot has cleared we can let the I/O continue */
1488 if (skdev->timeout_slot[skdev->timo_slot] == 0) {
1489 DPRINTK(skdev, "Slot drained, starting queue.\n");
1490 skdev->state = SKD_DRVR_STATE_ONLINE;
1491 skd_start_queue(skdev);
1492 return;
1493 }
1494 if (skdev->timer_countdown > 0) {
1495 skdev->timer_countdown--;
1496 return;
1497 }
1498 skd_restart_device(skdev);
1499 break;
1500
1501 case SKD_DRVR_STATE_RESTARTING:
1502 if (skdev->timer_countdown > 0) {
1503 skdev->timer_countdown--;
1504 return;
1505 }
1506 /* For now, we fault the drive. Could attempt resets to
1507 * revcover at some point. */
1508 skdev->state = SKD_DRVR_STATE_FAULT;
1509 pr_err("(%s): DriveFault Reconnect Timeout (%x)\n",
1510 skd_name(skdev), skdev->drive_state);
1511
1512 /*
1513 * Recovering does two things:
1514 * 1. completes IO with error
1515 * 2. reclaims dma resources
1516 * When is it safe to recover requests?
1517 * - if the drive state is faulted
1518 * - if the state is still soft reset after out timeout
1519 * - if the drive registers are dead (state = FF)
1520 * If it is "unsafe", we still need to recover, so we will
1521 * disable pci bus mastering and disable our interrupts.
1522 */
1523
1524 if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
1525 (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
1526 (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
1527 /* It never came out of soft reset. Try to
1528 * recover the requests and then let them
1529 * fail. This is to mitigate hung processes. */
1530 skd_recover_requests(skdev, 0);
1531 else {
1532 pr_err("(%s): Disable BusMaster (%x)\n",
1533 skd_name(skdev), skdev->drive_state);
1534 pci_disable_device(skdev->pdev);
1535 skd_disable_interrupts(skdev);
1536 skd_recover_requests(skdev, 0);
1537 }
1538
1539 /*start the queue so we can respond with error to requests */
1540 /* wakeup anyone waiting for startup complete */
1541 skd_start_queue(skdev);
1542 skdev->gendisk_on = -1;
1543 wake_up_interruptible(&skdev->waitq);
1544 break;
1545
1546 case SKD_DRVR_STATE_RESUMING:
1547 case SKD_DRVR_STATE_STOPPING:
1548 case SKD_DRVR_STATE_SYNCING:
1549 case SKD_DRVR_STATE_FAULT:
1550 case SKD_DRVR_STATE_DISAPPEARED:
1551 default:
1552 break;
1553 }
1554}
1555
1556static int skd_start_timer(struct skd_device *skdev)
1557{
1558 int rc;
1559
1560 init_timer(&skdev->timer);
1561 setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev);
1562
1563 rc = mod_timer(&skdev->timer, (jiffies + HZ));
1564 if (rc)
1565 pr_err("%s: failed to start timer %d\n",
1566 __func__, rc);
1567 return rc;
1568}
1569
1570static void skd_kill_timer(struct skd_device *skdev)
1571{
1572 del_timer_sync(&skdev->timer);
1573}
1574
1575/*
1576 *****************************************************************************
1577 * IOCTL
1578 *****************************************************************************
1579 */
1580static int skd_ioctl_sg_io(struct skd_device *skdev,
1581 fmode_t mode, void __user *argp);
1582static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
1583 struct skd_sg_io *sksgio);
1584static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
1585 struct skd_sg_io *sksgio);
1586static int skd_sg_io_prep_buffering(struct skd_device *skdev,
1587 struct skd_sg_io *sksgio);
1588static int skd_sg_io_copy_buffer(struct skd_device *skdev,
1589 struct skd_sg_io *sksgio, int dxfer_dir);
1590static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
1591 struct skd_sg_io *sksgio);
1592static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio);
1593static int skd_sg_io_release_skspcl(struct skd_device *skdev,
1594 struct skd_sg_io *sksgio);
1595static int skd_sg_io_put_status(struct skd_device *skdev,
1596 struct skd_sg_io *sksgio);
1597
1598static void skd_complete_special(struct skd_device *skdev,
1599 volatile struct fit_completion_entry_v1
1600 *skcomp,
1601 volatile struct fit_comp_error_info *skerr,
1602 struct skd_special_context *skspcl);
1603
1604static int skd_bdev_ioctl(struct block_device *bdev, fmode_t mode,
1605 uint cmd_in, ulong arg)
1606{
1607 int rc = 0;
1608 struct gendisk *disk = bdev->bd_disk;
1609 struct skd_device *skdev = disk->private_data;
1610 void __user *p = (void *)arg;
1611
1612 DPRINTK(skdev, "%s: CMD[%s] ioctl mode 0x%x, cmd 0x%x arg %0lx\n",
1613 disk->disk_name, current->comm, mode, cmd_in, arg);
1614
1615 if (!capable(CAP_SYS_ADMIN))
1616 return -EPERM;
1617
1618 switch (cmd_in) {
1619 case SG_SET_TIMEOUT:
1620 case SG_GET_TIMEOUT:
1621 case SG_GET_VERSION_NUM:
1622 rc = scsi_cmd_ioctl(disk->queue, disk, mode, cmd_in, p);
1623 break;
1624 case SG_IO:
1625 rc = skd_ioctl_sg_io(skdev, mode, p);
1626 break;
1627
1628 default:
1629 rc = -ENOTTY;
1630 break;
1631 }
1632
1633 DPRINTK(skdev, "%s: completion rc %d\n", disk->disk_name, rc);
1634 return rc;
1635}
1636
1637static int skd_ioctl_sg_io(struct skd_device *skdev, fmode_t mode,
1638 void __user *argp)
1639{
1640 int rc;
1641 struct skd_sg_io sksgio;
1642
1643 memset(&sksgio, 0, sizeof(sksgio));
1644 sksgio.mode = mode;
1645 sksgio.argp = argp;
1646 sksgio.iov = &sksgio.no_iov_iov;
1647
1648 switch (skdev->state) {
1649 case SKD_DRVR_STATE_ONLINE:
1650 case SKD_DRVR_STATE_BUSY_IMMINENT:
1651 break;
1652
1653 default:
1654 DPRINTK(skdev, "drive not online\n");
1655 rc = -ENXIO;
1656 goto out;
1657 }
1658
1659 if ((rc = skd_sg_io_get_and_check_args(skdev, &sksgio)) ||
1660 (rc = skd_sg_io_obtain_skspcl(skdev, &sksgio)) ||
1661 (rc = skd_sg_io_prep_buffering(skdev, &sksgio)) ||
1662 (rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_TO_DEV)))
1663 goto out;
1664
1665 if ((rc = skd_sg_io_send_fitmsg(skdev, &sksgio)) ||
1666 (rc = skd_sg_io_await(skdev, &sksgio)))
1667 goto out;
1668
1669 if ((rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_FROM_DEV)) ||
1670 (rc = skd_sg_io_put_status(skdev, &sksgio)))
1671 goto out;
1672
1673 rc = 0;
1674
1675out:
1676 skd_sg_io_release_skspcl(skdev, &sksgio);
1677
1678 if (sksgio.iov != NULL && sksgio.iov != &sksgio.no_iov_iov)
1679 kfree(sksgio.iov);
1680 return rc;
1681}
1682
1683static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
1684 struct skd_sg_io *sksgio)
1685{
1686 struct sg_io_hdr *sgp = &sksgio->sg;
1687 int i, acc;
1688
1689 if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) {
1690 DPRINTK(skdev, "access sg failed %p\n", sksgio->argp);
1691 return -EFAULT;
1692 }
1693
1694 if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) {
1695 DPRINTK(skdev, "copy_from_user sg failed %p\n", sksgio->argp);
1696 return -EFAULT;
1697 }
1698
1699 if (sgp->interface_id != SG_INTERFACE_ID_ORIG) {
1700 DPRINTK(skdev, "interface_id invalid 0x%x\n",
1701 sgp->interface_id);
1702 return -EINVAL;
1703 }
1704
1705 if (sgp->cmd_len > sizeof(sksgio->cdb)) {
1706 DPRINTK(skdev, "cmd_len invalid %d\n", sgp->cmd_len);
1707 return -EINVAL;
1708 }
1709
1710 if (sgp->iovec_count > 256) {
1711 DPRINTK(skdev, "iovec_count invalid %d\n", sgp->iovec_count);
1712 return -EINVAL;
1713 }
1714
1715 if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) {
1716 DPRINTK(skdev, "dxfer_len invalid %d\n", sgp->dxfer_len);
1717 return -EINVAL;
1718 }
1719
1720 switch (sgp->dxfer_direction) {
1721 case SG_DXFER_NONE:
1722 acc = -1;
1723 break;
1724
1725 case SG_DXFER_TO_DEV:
1726 acc = VERIFY_READ;
1727 break;
1728
1729 case SG_DXFER_FROM_DEV:
1730 case SG_DXFER_TO_FROM_DEV:
1731 acc = VERIFY_WRITE;
1732 break;
1733
1734 default:
1735 DPRINTK(skdev, "dxfer_dir invalid %d\n", sgp->dxfer_direction);
1736 return -EINVAL;
1737 }
1738
1739 if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) {
1740 DPRINTK(skdev, "copy_from_user cmdp failed %p\n", sgp->cmdp);
1741 return -EFAULT;
1742 }
1743
1744 if (sgp->mx_sb_len != 0) {
1745 if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) {
1746 DPRINTK(skdev, "access sbp failed %p\n", sgp->sbp);
1747 return -EFAULT;
1748 }
1749 }
1750
1751 if (sgp->iovec_count == 0) {
1752 sksgio->iov[0].iov_base = sgp->dxferp;
1753 sksgio->iov[0].iov_len = sgp->dxfer_len;
1754 sksgio->iovcnt = 1;
1755 sksgio->dxfer_len = sgp->dxfer_len;
1756 } else {
1757 struct sg_iovec *iov;
1758 uint nbytes = sizeof(*iov) * sgp->iovec_count;
1759 size_t iov_data_len;
1760
1761 iov = kmalloc(nbytes, GFP_KERNEL);
1762 if (iov == NULL) {
1763 DPRINTK(skdev, "alloc iovec failed %d\n",
1764 sgp->iovec_count);
1765 return -ENOMEM;
1766 }
1767 sksgio->iov = iov;
1768 sksgio->iovcnt = sgp->iovec_count;
1769
1770 if (copy_from_user(iov, sgp->dxferp, nbytes)) {
1771 DPRINTK(skdev, "copy_from_user iovec failed %p\n",
1772 sgp->dxferp);
1773 return -EFAULT;
1774 }
1775
1776 /*
1777 * Sum up the vecs, making sure they don't overflow
1778 */
1779 iov_data_len = 0;
1780 for (i = 0; i < sgp->iovec_count; i++) {
1781 if (iov_data_len + iov[i].iov_len < iov_data_len)
1782 return -EINVAL;
1783 iov_data_len += iov[i].iov_len;
1784 }
1785
1786 /* SG_IO howto says that the shorter of the two wins */
1787 if (sgp->dxfer_len < iov_data_len) {
1788 sksgio->iovcnt = iov_shorten((struct iovec *)iov,
1789 sgp->iovec_count,
1790 sgp->dxfer_len);
1791 sksgio->dxfer_len = sgp->dxfer_len;
1792 } else
1793 sksgio->dxfer_len = iov_data_len;
1794 }
1795
1796 if (sgp->dxfer_direction != SG_DXFER_NONE) {
1797 struct sg_iovec *iov = sksgio->iov;
1798 for (i = 0; i < sksgio->iovcnt; i++, iov++) {
1799 if (!access_ok(acc, iov->iov_base, iov->iov_len)) {
1800 DPRINTK(skdev, "access data failed %p/%d\n",
1801 iov->iov_base, (int)iov->iov_len);
1802 return -EFAULT;
1803 }
1804 }
1805 }
1806
1807 return 0;
1808}
1809
1810static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
1811 struct skd_sg_io *sksgio)
1812{
1813 struct skd_special_context *skspcl = NULL;
1814 int rc;
1815
1816 for (;; ) {
1817 ulong flags;
1818
1819 spin_lock_irqsave(&skdev->lock, flags);
1820 skspcl = skdev->skspcl_free_list;
1821 if (skspcl != NULL) {
1822 skdev->skspcl_free_list =
1823 (struct skd_special_context *)skspcl->req.next;
1824 skspcl->req.id += SKD_ID_INCR;
1825 skspcl->req.state = SKD_REQ_STATE_SETUP;
1826 skspcl->orphaned = 0;
1827 skspcl->req.n_sg = 0;
1828 }
1829 spin_unlock_irqrestore(&skdev->lock, flags);
1830
1831 if (skspcl != NULL) {
1832 rc = 0;
1833 break;
1834 }
1835
1836 DPRINTK(skdev, "blocking\n");
1837
1838 rc = wait_event_interruptible_timeout(
1839 skdev->waitq,
1840 (skdev->skspcl_free_list != NULL),
1841 msecs_to_jiffies(sksgio->sg.timeout));
1842
1843 DPRINTK(skdev, "unblocking, rc=%d\n", rc);
1844
1845 if (rc <= 0) {
1846 if (rc == 0)
1847 rc = -ETIMEDOUT;
1848 else
1849 rc = -EINTR;
1850 break;
1851 }
1852 /*
1853 * If we get here rc > 0 meaning the timeout to
1854 * wait_event_interruptible_timeout() had time left, hence the
1855 * sought event -- non-empty free list -- happened.
1856 * Retry the allocation.
1857 */
1858 }
1859 sksgio->skspcl = skspcl;
1860
1861 return rc;
1862}
1863
1864static int skd_skreq_prep_buffering(struct skd_device *skdev,
1865 struct skd_request_context *skreq,
1866 u32 dxfer_len)
1867{
1868 u32 resid = dxfer_len;
1869
1870 /*
1871 * The DMA engine must have aligned addresses and byte counts.
1872 */
1873 resid += (-resid) & 3;
1874 skreq->sg_byte_count = resid;
1875
1876 skreq->n_sg = 0;
1877
1878 while (resid > 0) {
1879 u32 nbytes = PAGE_SIZE;
1880 u32 ix = skreq->n_sg;
1881 struct scatterlist *sg = &skreq->sg[ix];
1882 struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
1883 struct page *page;
1884
1885 if (nbytes > resid)
1886 nbytes = resid;
1887
1888 page = alloc_page(GFP_KERNEL);
1889 if (page == NULL)
1890 return -ENOMEM;
1891
1892 sg_set_page(sg, page, nbytes, 0);
1893
1894 /* TODO: This should be going through a pci_???()
1895 * routine to do proper mapping. */
1896 sksg->control = FIT_SGD_CONTROL_NOT_LAST;
1897 sksg->byte_count = nbytes;
1898
1899 sksg->host_side_addr = sg_phys(sg);
1900
1901 sksg->dev_side_addr = 0;
1902 sksg->next_desc_ptr = skreq->sksg_dma_address +
1903 (ix + 1) * sizeof(*sksg);
1904
1905 skreq->n_sg++;
1906 resid -= nbytes;
1907 }
1908
1909 if (skreq->n_sg > 0) {
1910 u32 ix = skreq->n_sg - 1;
1911 struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
1912
1913 sksg->control = FIT_SGD_CONTROL_LAST;
1914 sksg->next_desc_ptr = 0;
1915 }
1916
1917 if (unlikely(skdev->dbg_level > 1)) {
1918 u32 i;
1919
1920 VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
1921 skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
1922 for (i = 0; i < skreq->n_sg; i++) {
1923 struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
1924
1925 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
1926 "addr=0x%llx next=0x%llx\n",
1927 i, sgd->byte_count, sgd->control,
1928 sgd->host_side_addr, sgd->next_desc_ptr);
1929 }
1930 }
1931
1932 return 0;
1933}
1934
1935static int skd_sg_io_prep_buffering(struct skd_device *skdev,
1936 struct skd_sg_io *sksgio)
1937{
1938 struct skd_special_context *skspcl = sksgio->skspcl;
1939 struct skd_request_context *skreq = &skspcl->req;
1940 u32 dxfer_len = sksgio->dxfer_len;
1941 int rc;
1942
1943 rc = skd_skreq_prep_buffering(skdev, skreq, dxfer_len);
1944 /*
1945 * Eventually, errors or not, skd_release_special() is called
1946 * to recover allocations including partial allocations.
1947 */
1948 return rc;
1949}
1950
1951static int skd_sg_io_copy_buffer(struct skd_device *skdev,
1952 struct skd_sg_io *sksgio, int dxfer_dir)
1953{
1954 struct skd_special_context *skspcl = sksgio->skspcl;
1955 u32 iov_ix = 0;
1956 struct sg_iovec curiov;
1957 u32 sksg_ix = 0;
1958 u8 *bufp = NULL;
1959 u32 buf_len = 0;
1960 u32 resid = sksgio->dxfer_len;
1961 int rc;
1962
1963 curiov.iov_len = 0;
1964 curiov.iov_base = NULL;
1965
1966 if (dxfer_dir != sksgio->sg.dxfer_direction) {
1967 if (dxfer_dir != SG_DXFER_TO_DEV ||
1968 sksgio->sg.dxfer_direction != SG_DXFER_TO_FROM_DEV)
1969 return 0;
1970 }
1971
1972 while (resid > 0) {
1973 u32 nbytes = PAGE_SIZE;
1974
1975 if (curiov.iov_len == 0) {
1976 curiov = sksgio->iov[iov_ix++];
1977 continue;
1978 }
1979
1980 if (buf_len == 0) {
1981 struct page *page;
1982 page = sg_page(&skspcl->req.sg[sksg_ix++]);
1983 bufp = page_address(page);
1984 buf_len = PAGE_SIZE;
1985 }
1986
1987 nbytes = min_t(u32, nbytes, resid);
1988 nbytes = min_t(u32, nbytes, curiov.iov_len);
1989 nbytes = min_t(u32, nbytes, buf_len);
1990
1991 if (dxfer_dir == SG_DXFER_TO_DEV)
1992 rc = __copy_from_user(bufp, curiov.iov_base, nbytes);
1993 else
1994 rc = __copy_to_user(curiov.iov_base, bufp, nbytes);
1995
1996 if (rc)
1997 return -EFAULT;
1998
1999 resid -= nbytes;
2000 curiov.iov_len -= nbytes;
2001 curiov.iov_base += nbytes;
2002 buf_len -= nbytes;
2003 }
2004
2005 return 0;
2006}
2007
2008static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
2009 struct skd_sg_io *sksgio)
2010{
2011 struct skd_special_context *skspcl = sksgio->skspcl;
2012 struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
2013 struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
2014
2015 memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
2016
2017 /* Initialize the FIT msg header */
2018 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
2019 fmh->num_protocol_cmds_coalesced = 1;
2020
2021 /* Initialize the SCSI request */
2022 if (sksgio->sg.dxfer_direction != SG_DXFER_NONE)
2023 scsi_req->hdr.sg_list_dma_address =
2024 cpu_to_be64(skspcl->req.sksg_dma_address);
2025 scsi_req->hdr.tag = skspcl->req.id;
2026 scsi_req->hdr.sg_list_len_bytes =
2027 cpu_to_be32(skspcl->req.sg_byte_count);
2028 memcpy(scsi_req->cdb, sksgio->cdb, sizeof(scsi_req->cdb));
2029
2030 skspcl->req.state = SKD_REQ_STATE_BUSY;
2031 skd_send_special_fitmsg(skdev, skspcl);
2032
2033 return 0;
2034}
2035
2036static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio)
2037{
2038 unsigned long flags;
2039 int rc;
2040
2041 rc = wait_event_interruptible_timeout(skdev->waitq,
2042 (sksgio->skspcl->req.state !=
2043 SKD_REQ_STATE_BUSY),
2044 msecs_to_jiffies(sksgio->sg.
2045 timeout));
2046
2047 spin_lock_irqsave(&skdev->lock, flags);
2048
2049 if (sksgio->skspcl->req.state == SKD_REQ_STATE_ABORTED) {
2050 DPRINTK(skdev, "skspcl %p aborted\n", sksgio->skspcl);
2051
2052 /* Build check cond, sense and let command finish. */
2053 /* For a timeout, we must fabricate completion and sense
2054 * data to complete the command */
2055 sksgio->skspcl->req.completion.status =
2056 SAM_STAT_CHECK_CONDITION;
2057
2058 memset(&sksgio->skspcl->req.err_info, 0,
2059 sizeof(sksgio->skspcl->req.err_info));
2060 sksgio->skspcl->req.err_info.type = 0x70;
2061 sksgio->skspcl->req.err_info.key = ABORTED_COMMAND;
2062 sksgio->skspcl->req.err_info.code = 0x44;
2063 sksgio->skspcl->req.err_info.qual = 0;
2064 rc = 0;
2065 } else if (sksgio->skspcl->req.state != SKD_REQ_STATE_BUSY)
2066 /* No longer on the adapter. We finish. */
2067 rc = 0;
2068 else {
2069 /* Something's gone wrong. Still busy. Timeout or
2070 * user interrupted (control-C). Mark as an orphan
2071 * so it will be disposed when completed. */
2072 sksgio->skspcl->orphaned = 1;
2073 sksgio->skspcl = NULL;
2074 if (rc == 0) {
2075 DPRINTK(skdev, "timed out %p (%u ms)\n", sksgio,
2076 sksgio->sg.timeout);
2077 rc = -ETIMEDOUT;
2078 } else {
2079 DPRINTK(skdev, "cntlc %p\n", sksgio);
2080 rc = -EINTR;
2081 }
2082 }
2083
2084 spin_unlock_irqrestore(&skdev->lock, flags);
2085
2086 return rc;
2087}
2088
2089static int skd_sg_io_put_status(struct skd_device *skdev,
2090 struct skd_sg_io *sksgio)
2091{
2092 struct sg_io_hdr *sgp = &sksgio->sg;
2093 struct skd_special_context *skspcl = sksgio->skspcl;
2094 int resid = 0;
2095
2096 u32 nb = be32_to_cpu(skspcl->req.completion.num_returned_bytes);
2097
2098 sgp->status = skspcl->req.completion.status;
2099 resid = sksgio->dxfer_len - nb;
2100
2101 sgp->masked_status = sgp->status & STATUS_MASK;
2102 sgp->msg_status = 0;
2103 sgp->host_status = 0;
2104 sgp->driver_status = 0;
2105 sgp->resid = resid;
2106 if (sgp->masked_status || sgp->host_status || sgp->driver_status)
2107 sgp->info |= SG_INFO_CHECK;
2108
2109 DPRINTK(skdev, "status %x masked %x resid 0x%x\n", sgp->status,
2110 sgp->masked_status, sgp->resid);
2111
2112 if (sgp->masked_status == SAM_STAT_CHECK_CONDITION) {
2113 if (sgp->mx_sb_len > 0) {
2114 struct fit_comp_error_info *ei = &skspcl->req.err_info;
2115 u32 nbytes = sizeof(*ei);
2116
2117 nbytes = min_t(u32, nbytes, sgp->mx_sb_len);
2118
2119 sgp->sb_len_wr = nbytes;
2120
2121 if (__copy_to_user(sgp->sbp, ei, nbytes)) {
2122 DPRINTK(skdev, "copy_to_user sense failed %p\n",
2123 sgp->sbp);
2124 return -EFAULT;
2125 }
2126 }
2127 }
2128
2129 if (__copy_to_user(sksgio->argp, sgp, sizeof(sg_io_hdr_t))) {
2130 DPRINTK(skdev, "copy_to_user sg failed %p\n", sksgio->argp);
2131 return -EFAULT;
2132 }
2133
2134 return 0;
2135}
2136
2137static int skd_sg_io_release_skspcl(struct skd_device *skdev,
2138 struct skd_sg_io *sksgio)
2139{
2140 struct skd_special_context *skspcl = sksgio->skspcl;
2141
2142 if (skspcl != NULL) {
2143 ulong flags;
2144
2145 sksgio->skspcl = NULL;
2146
2147 spin_lock_irqsave(&skdev->lock, flags);
2148 skd_release_special(skdev, skspcl);
2149 spin_unlock_irqrestore(&skdev->lock, flags);
2150 }
2151
2152 return 0;
2153}
2154
2155/*
2156 *****************************************************************************
2157 * INTERNAL REQUESTS -- generated by driver itself
2158 *****************************************************************************
2159 */
2160
2161static int skd_format_internal_skspcl(struct skd_device *skdev)
2162{
2163 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2164 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
2165 struct fit_msg_hdr *fmh;
2166 uint64_t dma_address;
2167 struct skd_scsi_request *scsi;
2168
2169 fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
2170 fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
2171 fmh->num_protocol_cmds_coalesced = 1;
2172
2173 scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
2174 memset(scsi, 0, sizeof(*scsi));
2175 dma_address = skspcl->req.sksg_dma_address;
2176 scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
2177 sgd->control = FIT_SGD_CONTROL_LAST;
2178 sgd->byte_count = 0;
2179 sgd->host_side_addr = skspcl->db_dma_address;
2180 sgd->dev_side_addr = 0;
2181 sgd->next_desc_ptr = 0LL;
2182
2183 return 1;
2184}
2185
2186#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
2187
2188static void skd_send_internal_skspcl(struct skd_device *skdev,
2189 struct skd_special_context *skspcl,
2190 u8 opcode)
2191{
2192 struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
2193 struct skd_scsi_request *scsi;
2194 unsigned char *buf = skspcl->data_buf;
2195 int i;
2196
2197 if (skspcl->req.state != SKD_REQ_STATE_IDLE)
2198 /*
2199 * A refresh is already in progress.
2200 * Just wait for it to finish.
2201 */
2202 return;
2203
2204 SKD_ASSERT((skspcl->req.id & SKD_ID_INCR) == 0);
2205 skspcl->req.state = SKD_REQ_STATE_BUSY;
2206 skspcl->req.id += SKD_ID_INCR;
2207
2208 scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
2209 scsi->hdr.tag = skspcl->req.id;
2210
2211 memset(scsi->cdb, 0, sizeof(scsi->cdb));
2212
2213 switch (opcode) {
2214 case TEST_UNIT_READY:
2215 scsi->cdb[0] = TEST_UNIT_READY;
2216 sgd->byte_count = 0;
2217 scsi->hdr.sg_list_len_bytes = 0;
2218 break;
2219
2220 case READ_CAPACITY:
2221 scsi->cdb[0] = READ_CAPACITY;
2222 sgd->byte_count = SKD_N_READ_CAP_BYTES;
2223 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2224 break;
2225
2226 case INQUIRY:
2227 scsi->cdb[0] = INQUIRY;
2228 scsi->cdb[1] = 0x01; /* evpd */
2229 scsi->cdb[2] = 0x80; /* serial number page */
2230 scsi->cdb[4] = 0x10;
2231 sgd->byte_count = 16;
2232 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2233 break;
2234
2235 case SYNCHRONIZE_CACHE:
2236 scsi->cdb[0] = SYNCHRONIZE_CACHE;
2237 sgd->byte_count = 0;
2238 scsi->hdr.sg_list_len_bytes = 0;
2239 break;
2240
2241 case WRITE_BUFFER:
2242 scsi->cdb[0] = WRITE_BUFFER;
2243 scsi->cdb[1] = 0x02;
2244 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
2245 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
2246 sgd->byte_count = WR_BUF_SIZE;
2247 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2248 /* fill incrementing byte pattern */
2249 for (i = 0; i < sgd->byte_count; i++)
2250 buf[i] = i & 0xFF;
2251 break;
2252
2253 case READ_BUFFER:
2254 scsi->cdb[0] = READ_BUFFER;
2255 scsi->cdb[1] = 0x02;
2256 scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
2257 scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
2258 sgd->byte_count = WR_BUF_SIZE;
2259 scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
2260 memset(skspcl->data_buf, 0, sgd->byte_count);
2261 break;
2262
2263 default:
2264 SKD_ASSERT("Don't know what to send");
2265 return;
2266
2267 }
2268 skd_send_special_fitmsg(skdev, skspcl);
2269}
2270
2271static void skd_refresh_device_data(struct skd_device *skdev)
2272{
2273 struct skd_special_context *skspcl = &skdev->internal_skspcl;
2274
2275 skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
2276}
2277
2278static int skd_chk_read_buf(struct skd_device *skdev,
2279 struct skd_special_context *skspcl)
2280{
2281 unsigned char *buf = skspcl->data_buf;
2282 int i;
2283
2284 /* check for incrementing byte pattern */
2285 for (i = 0; i < WR_BUF_SIZE; i++)
2286 if (buf[i] != (i & 0xFF))
2287 return 1;
2288
2289 return 0;
2290}
2291
2292static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
2293 u8 code, u8 qual, u8 fruc)
2294{
2295 /* If the check condition is of special interest, log a message */
2296 if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
2297 && (code == 0x04) && (qual == 0x06)) {
2298 pr_err("(%s): *** LOST_WRITE_DATA ERROR *** key/asc/"
2299 "ascq/fruc %02x/%02x/%02x/%02x\n",
2300 skd_name(skdev), key, code, qual, fruc);
2301 }
2302}
2303
2304static void skd_complete_internal(struct skd_device *skdev,
2305 volatile struct fit_completion_entry_v1
2306 *skcomp,
2307 volatile struct fit_comp_error_info *skerr,
2308 struct skd_special_context *skspcl)
2309{
2310 u8 *buf = skspcl->data_buf;
2311 u8 status;
2312 int i;
2313 struct skd_scsi_request *scsi =
2314 (struct skd_scsi_request *)&skspcl->msg_buf[64];
2315
2316 SKD_ASSERT(skspcl == &skdev->internal_skspcl);
2317
2318 DPRINTK(skdev, "complete internal %x\n", scsi->cdb[0]);
2319
2320 skspcl->req.completion = *skcomp;
2321 skspcl->req.state = SKD_REQ_STATE_IDLE;
2322 skspcl->req.id += SKD_ID_INCR;
2323
2324 status = skspcl->req.completion.status;
2325
2326 skd_log_check_status(skdev, status, skerr->key, skerr->code,
2327 skerr->qual, skerr->fruc);
2328
2329 switch (scsi->cdb[0]) {
2330 case TEST_UNIT_READY:
2331 if (status == SAM_STAT_GOOD)
2332 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
2333 else if ((status == SAM_STAT_CHECK_CONDITION) &&
2334 (skerr->key == MEDIUM_ERROR))
2335 skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
2336 else {
2337 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2338 VPRINTK(skdev, "TUR failed, don't send anymore"
2339 "state 0x%x\n", skdev->state);
2340 return;
2341 }
2342 DPRINTK(skdev, "**** TUR failed, retry skerr\n");
2343 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2344 }
2345 break;
2346
2347 case WRITE_BUFFER:
2348 if (status == SAM_STAT_GOOD)
2349 skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
2350 else {
2351 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2352 VPRINTK(skdev, "write buffer failed, don't send"
2353 " anymore state 0x%x\n", skdev->state);
2354 return;
2355 }
2356 DPRINTK(skdev,
2357 "**** write buffer failed, retry skerr\n");
2358 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2359 }
2360 break;
2361
2362 case READ_BUFFER:
2363 if (status == SAM_STAT_GOOD) {
2364 if (skd_chk_read_buf(skdev, skspcl) == 0)
2365 skd_send_internal_skspcl(skdev, skspcl,
2366 READ_CAPACITY);
2367 else {
2368 pr_err(
2369 "(%s):*** W/R Buffer mismatch %d ***\n",
2370 skd_name(skdev), skdev->connect_retries);
2371 if (skdev->connect_retries <
2372 SKD_MAX_CONNECT_RETRIES) {
2373 skdev->connect_retries++;
2374 skd_soft_reset(skdev);
2375 } else {
2376 pr_err(
2377 "(%s): W/R Buffer Connect Error\n",
2378 skd_name(skdev));
2379 return;
2380 }
2381 }
2382
2383 } else {
2384 if (skdev->state == SKD_DRVR_STATE_STOPPING) {
2385 VPRINTK(skdev,
2386 "read buffer failed, don't send anymore"
2387 "state 0x%x\n", skdev->state);
2388 return;
2389 }
2390 DPRINTK(skdev,
2391 "**** read buffer failed, retry skerr\n");
2392 skd_send_internal_skspcl(skdev, skspcl, 0x00);
2393 }
2394 break;
2395
2396 case READ_CAPACITY:
2397 skdev->read_cap_is_valid = 0;
2398 if (status == SAM_STAT_GOOD) {
2399 skdev->read_cap_last_lba =
2400 (buf[0] << 24) | (buf[1] << 16) |
2401 (buf[2] << 8) | buf[3];
2402 skdev->read_cap_blocksize =
2403 (buf[4] << 24) | (buf[5] << 16) |
2404 (buf[6] << 8) | buf[7];
2405
2406 DPRINTK(skdev, "last lba %d, bs %d\n",
2407 skdev->read_cap_last_lba,
2408 skdev->read_cap_blocksize);
2409
2410 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
2411
2412 skdev->read_cap_is_valid = 1;
2413
2414 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
2415 } else if ((status == SAM_STAT_CHECK_CONDITION) &&
2416 (skerr->key == MEDIUM_ERROR)) {
2417 skdev->read_cap_last_lba = ~0;
2418 set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
2419 DPRINTK(skdev,
2420 "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
2421 skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
2422 } else {
2423 DPRINTK(skdev, "**** READCAP failed, retry TUR\n");
2424 skd_send_internal_skspcl(skdev, skspcl,
2425 TEST_UNIT_READY);
2426 }
2427 break;
2428
2429 case INQUIRY:
2430 skdev->inquiry_is_valid = 0;
2431 if (status == SAM_STAT_GOOD) {
2432 skdev->inquiry_is_valid = 1;
2433
2434 for (i = 0; i < 12; i++)
2435 skdev->inq_serial_num[i] = buf[i + 4];
2436 skdev->inq_serial_num[12] = 0;
2437 }
2438
2439 if (skd_unquiesce_dev(skdev) < 0)
2440 DPRINTK(skdev, "**** failed, to ONLINE device\n");
2441 /* connection is complete */
2442 skdev->connect_retries = 0;
2443 break;
2444
2445 case SYNCHRONIZE_CACHE:
2446 if (status == SAM_STAT_GOOD)
2447 skdev->sync_done = 1;
2448 else
2449 skdev->sync_done = -1;
2450 wake_up_interruptible(&skdev->waitq);
2451 break;
2452
2453 default:
2454 SKD_ASSERT("we didn't send this");
2455 }
2456}
2457
2458/*
2459 *****************************************************************************
2460 * FIT MESSAGES
2461 *****************************************************************************
2462 */
2463
2464static void skd_send_fitmsg(struct skd_device *skdev,
2465 struct skd_fitmsg_context *skmsg)
2466{
2467 u64 qcmd;
2468 struct fit_msg_hdr *fmh;
2469
2470 VPRINTK(skdev, "dma address 0x%llx, busy=%d\n",
2471 skmsg->mb_dma_address, skdev->in_flight);
2472 VPRINTK(skdev, "msg_buf 0x%p, offset %x\n",
2473 skmsg->msg_buf, skmsg->offset);
2474
2475 qcmd = skmsg->mb_dma_address;
2476 qcmd |= FIT_QCMD_QID_NORMAL;
2477
2478 fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
2479 skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
2480
2481 if (unlikely(skdev->dbg_level > 1)) {
2482 u8 *bp = (u8 *)skmsg->msg_buf;
2483 int i;
2484 for (i = 0; i < skmsg->length; i += 8) {
2485 VPRINTK(skdev, " msg[%2d] %02x %02x %02x %02x "
2486 "%02x %02x %02x %02x\n",
2487 i, bp[i + 0], bp[i + 1], bp[i + 2],
2488 bp[i + 3], bp[i + 4], bp[i + 5],
2489 bp[i + 6], bp[i + 7]);
2490 if (i == 0)
2491 i = 64 - 8;
2492 }
2493 }
2494
2495 if (skmsg->length > 256)
2496 qcmd |= FIT_QCMD_MSGSIZE_512;
2497 else if (skmsg->length > 128)
2498 qcmd |= FIT_QCMD_MSGSIZE_256;
2499 else if (skmsg->length > 64)
2500 qcmd |= FIT_QCMD_MSGSIZE_128;
2501 else
2502 /*
2503 * This makes no sense because the FIT msg header is
2504 * 64 bytes. If the msg is only 64 bytes long it has
2505 * no payload.
2506 */
2507 qcmd |= FIT_QCMD_MSGSIZE_64;
2508
2509 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
2510
2511}
2512
2513static void skd_send_special_fitmsg(struct skd_device *skdev,
2514 struct skd_special_context *skspcl)
2515{
2516 u64 qcmd;
2517
2518 if (unlikely(skdev->dbg_level > 1)) {
2519 u8 *bp = (u8 *)skspcl->msg_buf;
2520 int i;
2521
2522 for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
2523 VPRINTK(skdev,
2524 " spcl[%2d] %02x %02x %02x %02x "
2525 "%02x %02x %02x %02x\n", i,
2526 bp[i + 0], bp[i + 1], bp[i + 2], bp[i + 3],
2527 bp[i + 4], bp[i + 5], bp[i + 6], bp[i + 7]);
2528 if (i == 0)
2529 i = 64 - 8;
2530 }
2531
2532 VPRINTK(skdev, "skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n",
2533 skspcl, skspcl->req.id, skspcl->req.sksg_list,
2534 skspcl->req.sksg_dma_address);
2535 for (i = 0; i < skspcl->req.n_sg; i++) {
2536 struct fit_sg_descriptor *sgd =
2537 &skspcl->req.sksg_list[i];
2538
2539 VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
2540 "addr=0x%llx next=0x%llx\n",
2541 i, sgd->byte_count, sgd->control,
2542 sgd->host_side_addr, sgd->next_desc_ptr);
2543 }
2544 }
2545
2546 /*
2547 * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
2548 * and one 64-byte SSDI command.
2549 */
2550 qcmd = skspcl->mb_dma_address;
2551 qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
2552
2553 SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
2554}
2555
2556/*
2557 *****************************************************************************
2558 * COMPLETION QUEUE
2559 *****************************************************************************
2560 */
2561
2562static void skd_complete_other(struct skd_device *skdev,
2563 volatile struct fit_completion_entry_v1 *skcomp,
2564 volatile struct fit_comp_error_info *skerr);
2565
2566
2567static void skd_requeue_request(struct skd_device *skdev,
2568 struct skd_request_context *skreq);
2569
2570struct sns_info {
2571 u8 type;
2572 u8 stat;
2573 u8 key;
2574 u8 asc;
2575 u8 ascq;
2576 u8 mask;
2577 enum skd_check_status_action action;
2578};
2579
2580static struct sns_info skd_chkstat_table[] = {
2581 /* Good */
2582 { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
2583 SKD_CHECK_STATUS_REPORT_GOOD },
2584
2585 /* Smart alerts */
2586 { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
2587 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2588 { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
2589 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2590 { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
2591 SKD_CHECK_STATUS_REPORT_SMART_ALERT },
2592
2593 /* Retry (with limits) */
2594 { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
2595 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2596 { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
2597 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2598 { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
2599 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2600 { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
2601 SKD_CHECK_STATUS_REQUEUE_REQUEST },
2602
2603 /* Busy (or about to be) */
2604 { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
2605 SKD_CHECK_STATUS_BUSY_IMMINENT },
2606};
2607
2608/*
2609 * Look up status and sense data to decide how to handle the error
2610 * from the device.
2611 * mask says which fields must match e.g., mask=0x18 means check
2612 * type and stat, ignore key, asc, ascq.
2613 */
2614
2615static enum skd_check_status_action skd_check_status(struct skd_device *skdev,
2616 u8 cmp_status,
2617 volatile struct fit_comp_error_info *skerr)
2618{
2619 int i, n;
2620
2621 pr_err("(%s): key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
2622 skd_name(skdev), skerr->key, skerr->code, skerr->qual,
2623 skerr->fruc);
2624
2625 VPRINTK(skdev, "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x "
2626 "fruc=%02x\n", skerr->type, cmp_status, skerr->key,
2627 skerr->code, skerr->qual, skerr->fruc);
2628
2629 /* Does the info match an entry in the good category? */
2630 n = sizeof(skd_chkstat_table) / sizeof(skd_chkstat_table[0]);
2631 for (i = 0; i < n; i++) {
2632 struct sns_info *sns = &skd_chkstat_table[i];
2633
2634 if (sns->mask & 0x10)
2635 if (skerr->type != sns->type)
2636 continue;
2637
2638 if (sns->mask & 0x08)
2639 if (cmp_status != sns->stat)
2640 continue;
2641
2642 if (sns->mask & 0x04)
2643 if (skerr->key != sns->key)
2644 continue;
2645
2646 if (sns->mask & 0x02)
2647 if (skerr->code != sns->asc)
2648 continue;
2649
2650 if (sns->mask & 0x01)
2651 if (skerr->qual != sns->ascq)
2652 continue;
2653
2654 if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
2655 pr_err("(%s): SMART Alert: sense key/asc/ascq "
2656 "%02x/%02x/%02x\n",
2657 skd_name(skdev), skerr->key,
2658 skerr->code, skerr->qual);
2659 }
2660 return sns->action;
2661 }
2662
2663 /* No other match, so nonzero status means error,
2664 * zero status means good
2665 */
2666 if (cmp_status) {
2667 DPRINTK(skdev, "status check: error\n");
2668 return SKD_CHECK_STATUS_REPORT_ERROR;
2669 }
2670
2671 DPRINTK(skdev, "status check good default\n");
2672 return SKD_CHECK_STATUS_REPORT_GOOD;
2673}
2674
2675static void skd_resolve_req_exception(struct skd_device *skdev,
2676 struct skd_request_context *skreq)
2677{
2678 u8 cmp_status = skreq->completion.status;
2679
2680 switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
2681 case SKD_CHECK_STATUS_REPORT_GOOD:
2682 case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
2683 skd_end_request(skdev, skreq, 0);
2684 break;
2685
2686 case SKD_CHECK_STATUS_BUSY_IMMINENT:
2687 skd_log_skreq(skdev, skreq, "retry(busy)");
2688 skd_requeue_request(skdev, skreq);
2689 pr_info("(%s) drive BUSY imminent\n", skd_name(skdev));
2690 skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
2691 skdev->timer_countdown = SKD_TIMER_MINUTES(20);
2692 skd_quiesce_dev(skdev);
2693 break;
2694
2695 case SKD_CHECK_STATUS_REQUEUE_REQUEST:
2696 if (!skd_bio) {
2697 if ((unsigned long) ++skreq->req->special <
2698 SKD_MAX_RETRIES) {
2699 skd_log_skreq(skdev, skreq, "retry");
2700 skd_requeue_request(skdev, skreq);
2701 break;
2702 }
2703 }
2704 /* fall through to report error */
2705
2706 case SKD_CHECK_STATUS_REPORT_ERROR:
2707 default:
2708 skd_end_request(skdev, skreq, -EIO);
2709 break;
2710 }
2711}
2712
2713static void skd_requeue_request(struct skd_device *skdev,
2714 struct skd_request_context *skreq)
2715{
2716 if (!skd_bio) {
2717 blk_requeue_request(skdev->queue, skreq->req);
2718 } else {
2719 bio_list_add_head(&skdev->bio_queue, skreq->bio);
2720 skreq->bio = NULL;
2721 }
2722}
2723
2724
2725
2726/* assume spinlock is already held */
2727static void skd_release_skreq(struct skd_device *skdev,
2728 struct skd_request_context *skreq)
2729{
2730 u32 msg_slot;
2731 struct skd_fitmsg_context *skmsg;
2732
2733 u32 timo_slot;
2734
2735 /*
2736 * Reclaim the FIT msg buffer if this is
2737 * the first of the requests it carried to
2738 * be completed. The FIT msg buffer used to
2739 * send this request cannot be reused until
2740 * we are sure the s1120 card has copied
2741 * it to its memory. The FIT msg might have
2742 * contained several requests. As soon as
2743 * any of them are completed we know that
2744 * the entire FIT msg was transferred.
2745 * Only the first completed request will
2746 * match the FIT msg buffer id. The FIT
2747 * msg buffer id is immediately updated.
2748 * When subsequent requests complete the FIT
2749 * msg buffer id won't match, so we know
2750 * quite cheaply that it is already done.
2751 */
2752 msg_slot = skreq->fitmsg_id & SKD_ID_SLOT_MASK;
2753 SKD_ASSERT(msg_slot < skdev->num_fitmsg_context);
2754
2755 skmsg = &skdev->skmsg_table[msg_slot];
2756 if (skmsg->id == skreq->fitmsg_id) {
2757 SKD_ASSERT(skmsg->state == SKD_MSG_STATE_BUSY);
2758 SKD_ASSERT(skmsg->outstanding > 0);
2759 skmsg->outstanding--;
2760 if (skmsg->outstanding == 0) {
2761 skmsg->state = SKD_MSG_STATE_IDLE;
2762 skmsg->id += SKD_ID_INCR;
2763 skmsg->next = skdev->skmsg_free_list;
2764 skdev->skmsg_free_list = skmsg;
2765 }
2766 }
2767
2768 /*
2769 * Decrease the number of active requests.
2770 * Also decrements the count in the timeout slot.
2771 */
2772 SKD_ASSERT(skdev->in_flight > 0);
2773 skdev->in_flight -= 1;
2774
2775 timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
2776 SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0);
2777 skdev->timeout_slot[timo_slot] -= 1;
2778
2779 /*
2780 * Reset backpointer
2781 */
2782 if (likely(!skd_bio))
2783 skreq->req = NULL;
2784 else
2785 skreq->bio = NULL;
2786
2787
2788 /*
2789 * Reclaim the skd_request_context
2790 */
2791 skreq->state = SKD_REQ_STATE_IDLE;
2792 skreq->id += SKD_ID_INCR;
2793 skreq->next = skdev->skreq_free_list;
2794 skdev->skreq_free_list = skreq;
2795}
2796
2797#define DRIVER_INQ_EVPD_PAGE_CODE 0xDA
2798
2799static void skd_do_inq_page_00(struct skd_device *skdev,
2800 volatile struct fit_completion_entry_v1 *skcomp,
2801 volatile struct fit_comp_error_info *skerr,
2802 uint8_t *cdb, uint8_t *buf)
2803{
2804 uint16_t insert_pt, max_bytes, drive_pages, drive_bytes, new_size;
2805
2806 /* Caller requested "supported pages". The driver needs to insert
2807 * its page.
2808 */
2809 VPRINTK(skdev, "skd_do_driver_inquiry: modify supported pages.\n");
2810
2811 /* If the device rejected the request because the CDB was
2812 * improperly formed, then just leave.
2813 */
2814 if (skcomp->status == SAM_STAT_CHECK_CONDITION &&
2815 skerr->key == ILLEGAL_REQUEST && skerr->code == 0x24)
2816 return;
2817
2818 /* Get the amount of space the caller allocated */
2819 max_bytes = (cdb[3] << 8) | cdb[4];
2820
2821 /* Get the number of pages actually returned by the device */
2822 drive_pages = (buf[2] << 8) | buf[3];
2823 drive_bytes = drive_pages + 4;
2824 new_size = drive_pages + 1;
2825
2826 /* Supported pages must be in numerical order, so find where
2827 * the driver page needs to be inserted into the list of
2828 * pages returned by the device.
2829 */
2830 for (insert_pt = 4; insert_pt < drive_bytes; insert_pt++) {
2831 if (buf[insert_pt] == DRIVER_INQ_EVPD_PAGE_CODE)
2832 return; /* Device using this page code. abort */
2833 else if (buf[insert_pt] > DRIVER_INQ_EVPD_PAGE_CODE)
2834 break;
2835 }
2836
2837 if (insert_pt < max_bytes) {
2838 uint16_t u;
2839
2840 /* Shift everything up one byte to make room. */
2841 for (u = new_size + 3; u > insert_pt; u--)
2842 buf[u] = buf[u - 1];
2843 buf[insert_pt] = DRIVER_INQ_EVPD_PAGE_CODE;
2844
2845 /* SCSI byte order increment of num_returned_bytes by 1 */
2846 skcomp->num_returned_bytes =
2847 be32_to_cpu(skcomp->num_returned_bytes) + 1;
2848 skcomp->num_returned_bytes =
2849 be32_to_cpu(skcomp->num_returned_bytes);
2850 }
2851
2852 /* update page length field to reflect the driver's page too */
2853 buf[2] = (uint8_t)((new_size >> 8) & 0xFF);
2854 buf[3] = (uint8_t)((new_size >> 0) & 0xFF);
2855}
2856
2857static void skd_get_link_info(struct pci_dev *pdev, u8 *speed, u8 *width)
2858{
2859 int pcie_reg;
2860 u16 pci_bus_speed;
2861 u8 pci_lanes;
2862
2863 pcie_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
2864 if (pcie_reg) {
2865 u16 linksta;
2866 pci_read_config_word(pdev, pcie_reg + PCI_EXP_LNKSTA, &linksta);
2867
2868 pci_bus_speed = linksta & 0xF;
2869 pci_lanes = (linksta & 0x3F0) >> 4;
2870 } else {
2871 *speed = STEC_LINK_UNKNOWN;
2872 *width = 0xFF;
2873 return;
2874 }
2875
2876 switch (pci_bus_speed) {
2877 case 1:
2878 *speed = STEC_LINK_2_5GTS;
2879 break;
2880 case 2:
2881 *speed = STEC_LINK_5GTS;
2882 break;
2883 case 3:
2884 *speed = STEC_LINK_8GTS;
2885 break;
2886 default:
2887 *speed = STEC_LINK_UNKNOWN;
2888 break;
2889 }
2890
2891 if (pci_lanes <= 0x20)
2892 *width = pci_lanes;
2893 else
2894 *width = 0xFF;
2895}
2896
2897static void skd_do_inq_page_da(struct skd_device *skdev,
2898 volatile struct fit_completion_entry_v1 *skcomp,
2899 volatile struct fit_comp_error_info *skerr,
2900 uint8_t *cdb, uint8_t *buf)
2901{
2902 unsigned max_bytes;
2903 struct driver_inquiry_data inq;
2904 u16 val;
2905
2906 VPRINTK(skdev, "skd_do_driver_inquiry: return driver page\n");
2907
2908 memset(&inq, 0, sizeof(inq));
2909
2910 inq.page_code = DRIVER_INQ_EVPD_PAGE_CODE;
2911
2912 if (skdev->pdev && skdev->pdev->bus) {
2913 skd_get_link_info(skdev->pdev,
2914 &inq.pcie_link_speed, &inq.pcie_link_lanes);
2915 inq.pcie_bus_number = cpu_to_be16(skdev->pdev->bus->number);
2916 inq.pcie_device_number = PCI_SLOT(skdev->pdev->devfn);
2917 inq.pcie_function_number = PCI_FUNC(skdev->pdev->devfn);
2918
2919 pci_read_config_word(skdev->pdev, PCI_VENDOR_ID, &val);
2920 inq.pcie_vendor_id = cpu_to_be16(val);
2921
2922 pci_read_config_word(skdev->pdev, PCI_DEVICE_ID, &val);
2923 inq.pcie_device_id = cpu_to_be16(val);
2924
2925 pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_VENDOR_ID,
2926 &val);
2927 inq.pcie_subsystem_vendor_id = cpu_to_be16(val);
2928
2929 pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_ID, &val);
2930 inq.pcie_subsystem_device_id = cpu_to_be16(val);
2931 } else {
2932 inq.pcie_bus_number = 0xFFFF;
2933 inq.pcie_device_number = 0xFF;
2934 inq.pcie_function_number = 0xFF;
2935 inq.pcie_link_speed = 0xFF;
2936 inq.pcie_link_lanes = 0xFF;
2937 inq.pcie_vendor_id = 0xFFFF;
2938 inq.pcie_device_id = 0xFFFF;
2939 inq.pcie_subsystem_vendor_id = 0xFFFF;
2940 inq.pcie_subsystem_device_id = 0xFFFF;
2941 }
2942
2943 /* Driver version, fixed lenth, padded with spaces on the right */
2944 inq.driver_version_length = sizeof(inq.driver_version);
2945 memset(&inq.driver_version, ' ', sizeof(inq.driver_version));
2946 memcpy(inq.driver_version, DRV_VER_COMPL,
2947 min(sizeof(inq.driver_version), strlen(DRV_VER_COMPL)));
2948
2949 inq.page_length = cpu_to_be16((sizeof(inq) - 4));
2950
2951 /* Clear the error set by the device */
2952 skcomp->status = SAM_STAT_GOOD;
2953 memset((void *)skerr, 0, sizeof(*skerr));
2954
2955 /* copy response into output buffer */
2956 max_bytes = (cdb[3] << 8) | cdb[4];
2957 memcpy(buf, &inq, min_t(unsigned, max_bytes, sizeof(inq)));
2958
2959 skcomp->num_returned_bytes =
2960 be32_to_cpu(min_t(uint16_t, max_bytes, sizeof(inq)));
2961}
2962
2963static void skd_do_driver_inq(struct skd_device *skdev,
2964 volatile struct fit_completion_entry_v1 *skcomp,
2965 volatile struct fit_comp_error_info *skerr,
2966 uint8_t *cdb, uint8_t *buf)
2967{
2968 if (!buf)
2969 return;
2970 else if (cdb[0] != INQUIRY)
2971 return; /* Not an INQUIRY */
2972 else if ((cdb[1] & 1) == 0)
2973 return; /* EVPD not set */
2974 else if (cdb[2] == 0)
2975 /* Need to add driver's page to supported pages list */
2976 skd_do_inq_page_00(skdev, skcomp, skerr, cdb, buf);
2977 else if (cdb[2] == DRIVER_INQ_EVPD_PAGE_CODE)
2978 /* Caller requested driver's page */
2979 skd_do_inq_page_da(skdev, skcomp, skerr, cdb, buf);
2980}
2981
2982static unsigned char *skd_sg_1st_page_ptr(struct scatterlist *sg)
2983{
2984 if (!sg)
2985 return NULL;
2986 if (!sg_page(sg))
2987 return NULL;
2988 return sg_virt(sg);
2989}
2990
2991static void skd_process_scsi_inq(struct skd_device *skdev,
2992 volatile struct fit_completion_entry_v1
2993 *skcomp,
2994 volatile struct fit_comp_error_info *skerr,
2995 struct skd_special_context *skspcl)
2996{
2997 uint8_t *buf;
2998 struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
2999 struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
3000
3001 dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
3002 skspcl->req.sg_data_dir);
3003 buf = skd_sg_1st_page_ptr(skspcl->req.sg);
3004
3005 if (buf)
3006 skd_do_driver_inq(skdev, skcomp, skerr, scsi_req->cdb, buf);
3007}
3008
3009
3010static int skd_isr_completion_posted(struct skd_device *skdev,
3011 int limit, int *enqueued)
3012{
3013 volatile struct fit_completion_entry_v1 *skcmp = NULL;
3014 volatile struct fit_comp_error_info *skerr;
3015 u16 req_id;
3016 u32 req_slot;
3017 struct skd_request_context *skreq;
3018 u16 cmp_cntxt = 0;
3019 u8 cmp_status = 0;
3020 u8 cmp_cycle = 0;
3021 u32 cmp_bytes = 0;
3022 int rc = 0;
3023 int processed = 0;
3024 int ret;
3025
3026
3027 for (;; ) {
3028 SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
3029
3030 skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
3031 cmp_cycle = skcmp->cycle;
3032 cmp_cntxt = skcmp->tag;
3033 cmp_status = skcmp->status;
3034 cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
3035
3036 skerr = &skdev->skerr_table[skdev->skcomp_ix];
3037
3038 VPRINTK(skdev,
3039 "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d "
3040 "busy=%d rbytes=0x%x proto=%d\n", skdev->skcomp_cycle,
3041 skdev->skcomp_ix, cmp_cycle, cmp_cntxt, cmp_status,
3042 skdev->in_flight, cmp_bytes, skdev->proto_ver);
3043
3044 if (cmp_cycle != skdev->skcomp_cycle) {
3045 VPRINTK(skdev, "end of completions\n");
3046 break;
3047 }
3048 /*
3049 * Update the completion queue head index and possibly
3050 * the completion cycle count. 8-bit wrap-around.
3051 */
3052 skdev->skcomp_ix++;
3053 if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
3054 skdev->skcomp_ix = 0;
3055 skdev->skcomp_cycle++;
3056 }
3057
3058 /*
3059 * The command context is a unique 32-bit ID. The low order
3060 * bits help locate the request. The request is usually a
3061 * r/w request (see skd_start() above) or a special request.
3062 */
3063 req_id = cmp_cntxt;
3064 req_slot = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
3065
3066 /* Is this other than a r/w request? */
3067 if (req_slot >= skdev->num_req_context) {
3068 /*
3069 * This is not a completion for a r/w request.
3070 */
3071 skd_complete_other(skdev, skcmp, skerr);
3072 continue;
3073 }
3074
3075 skreq = &skdev->skreq_table[req_slot];
3076
3077 /*
3078 * Make sure the request ID for the slot matches.
3079 */
3080 if (skreq->id != req_id) {
3081 DPRINTK(skdev, "mismatch comp_id=0x%x req_id=0x%x\n",
3082 req_id, skreq->id);
3083 {
3084 u16 new_id = cmp_cntxt;
3085 pr_err("(%s): Completion mismatch "
3086 "comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
3087 skd_name(skdev), req_id,
3088 skreq->id, new_id);
3089
3090 continue;
3091 }
3092 }
3093
3094 SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
3095
3096 if (skreq->state == SKD_REQ_STATE_ABORTED) {
3097 DPRINTK(skdev, "reclaim req %p id=%04x\n",
3098 skreq, skreq->id);
3099 /* a previously timed out command can
3100 * now be cleaned up */
3101 skd_release_skreq(skdev, skreq);
3102 continue;
3103 }
3104
3105 skreq->completion = *skcmp;
3106 if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
3107 skreq->err_info = *skerr;
3108 skd_log_check_status(skdev, cmp_status, skerr->key,
3109 skerr->code, skerr->qual,
3110 skerr->fruc);
3111 }
3112 /* Release DMA resources for the request. */
3113 if (skreq->n_sg > 0)
3114 skd_postop_sg_list(skdev, skreq);
3115
3116 if (((!skd_bio) && !skreq->req) ||
3117 ((skd_bio) && !skreq->bio)) {
3118 DPRINTK(skdev, "NULL backptr skdreq %p, "
3119 "req=0x%x req_id=0x%x\n",
3120 skreq, skreq->id, req_id);
3121 } else {
3122 /*
3123 * Capture the outcome and post it back to the
3124 * native request.
3125 */
3126 if (likely(cmp_status == SAM_STAT_GOOD)) {
3127 if (unlikely(skreq->flush_cmd)) {
3128 if (skd_bio) {
3129 /* if empty size bio, we are all done */
3130 if (bio_sectors(skreq->bio) == 0) {
3131 skd_end_request(skdev, skreq, 0);
3132 } else {
3133 ret = skd_flush_cmd_enqueue(skdev, (void *)skreq->bio);
3134 if (ret != 0) {
3135 pr_err("Failed to enqueue flush bio with Data. Err=%d.\n", ret);
3136 skd_end_request(skdev, skreq, ret);
3137 } else {
3138 ((*enqueued)++);
3139 }
3140 }
3141 } else {
3142 skd_end_request(skdev, skreq, 0);
3143 }
3144 } else {
3145 skd_end_request(skdev, skreq, 0);
3146 }
3147 } else {
3148 skd_resolve_req_exception(skdev, skreq);
3149 }
3150 }
3151
3152 /*
3153 * Release the skreq, its FIT msg (if one), timeout slot,
3154 * and queue depth.
3155 */
3156 skd_release_skreq(skdev, skreq);
3157
3158 /* skd_isr_comp_limit equal zero means no limit */
3159 if (limit) {
3160 if (++processed >= limit) {
3161 rc = 1;
3162 break;
3163 }
3164 }
3165 }
3166
3167 if ((skdev->state == SKD_DRVR_STATE_PAUSING)
3168 && (skdev->in_flight) == 0) {
3169 skdev->state = SKD_DRVR_STATE_PAUSED;
3170 wake_up_interruptible(&skdev->waitq);
3171 }
3172
3173 return rc;
3174}
3175
3176static void skd_complete_other(struct skd_device *skdev,
3177 volatile struct fit_completion_entry_v1 *skcomp,
3178 volatile struct fit_comp_error_info *skerr)
3179{
3180 u32 req_id = 0;
3181 u32 req_table;
3182 u32 req_slot;
3183 struct skd_special_context *skspcl;
3184
3185 req_id = skcomp->tag;
3186 req_table = req_id & SKD_ID_TABLE_MASK;
3187 req_slot = req_id & SKD_ID_SLOT_MASK;
3188
3189 DPRINTK(skdev, "table=0x%x id=0x%x slot=%d\n", req_table, req_id,
3190 req_slot);
3191
3192 /*
3193 * Based on the request id, determine how to dispatch this completion.
3194 * This swich/case is finding the good cases and forwarding the
3195 * completion entry. Errors are reported below the switch.
3196 */
3197 switch (req_table) {
3198 case SKD_ID_RW_REQUEST:
3199 /*
3200 * The caller, skd_completion_posted_isr() above,
3201 * handles r/w requests. The only way we get here
3202 * is if the req_slot is out of bounds.
3203 */
3204 break;
3205
3206 case SKD_ID_SPECIAL_REQUEST:
3207 /*
3208 * Make sure the req_slot is in bounds and that the id
3209 * matches.
3210 */
3211 if (req_slot < skdev->n_special) {
3212 skspcl = &skdev->skspcl_table[req_slot];
3213 if (skspcl->req.id == req_id &&
3214 skspcl->req.state == SKD_REQ_STATE_BUSY) {
3215 skd_complete_special(skdev,
3216 skcomp, skerr, skspcl);
3217 return;
3218 }
3219 }
3220 break;
3221
3222 case SKD_ID_INTERNAL:
3223 if (req_slot == 0) {
3224 skspcl = &skdev->internal_skspcl;
3225 if (skspcl->req.id == req_id &&
3226 skspcl->req.state == SKD_REQ_STATE_BUSY) {
3227 skd_complete_internal(skdev,
3228 skcomp, skerr, skspcl);
3229 return;
3230 }
3231 }
3232 break;
3233
3234 case SKD_ID_FIT_MSG:
3235 /*
3236 * These id's should never appear in a completion record.
3237 */
3238 break;
3239
3240 default:
3241 /*
3242 * These id's should never appear anywhere;
3243 */
3244 break;
3245 }
3246
3247 /*
3248 * If we get here it is a bad or stale id.
3249 */
3250}
3251
3252static void skd_complete_special(struct skd_device *skdev,
3253 volatile struct fit_completion_entry_v1
3254 *skcomp,
3255 volatile struct fit_comp_error_info *skerr,
3256 struct skd_special_context *skspcl)
3257{
3258 DPRINTK(skdev, " completing special request %p\n", skspcl);
3259 if (skspcl->orphaned) {
3260 /* Discard orphaned request */
3261 /* ?: Can this release directly or does it need
3262 * to use a worker? */
3263 DPRINTK(skdev, "release orphaned %p\n", skspcl);
3264 skd_release_special(skdev, skspcl);
3265 return;
3266 }
3267
3268 skd_process_scsi_inq(skdev, skcomp, skerr, skspcl);
3269
3270 skspcl->req.state = SKD_REQ_STATE_COMPLETED;
3271 skspcl->req.completion = *skcomp;
3272 skspcl->req.err_info = *skerr;
3273
3274 skd_log_check_status(skdev, skspcl->req.completion.status, skerr->key,
3275 skerr->code, skerr->qual, skerr->fruc);
3276
3277 wake_up_interruptible(&skdev->waitq);
3278}
3279
3280/* assume spinlock is already held */
3281static void skd_release_special(struct skd_device *skdev,
3282 struct skd_special_context *skspcl)
3283{
3284 int i, was_depleted;
3285
3286 for (i = 0; i < skspcl->req.n_sg; i++) {
3287
3288 struct page *page = sg_page(&skspcl->req.sg[i]);
3289 __free_page(page);
3290 }
3291
3292 was_depleted = (skdev->skspcl_free_list == NULL);
3293
3294 skspcl->req.state = SKD_REQ_STATE_IDLE;
3295 skspcl->req.id += SKD_ID_INCR;
3296 skspcl->req.next =
3297 (struct skd_request_context *)skdev->skspcl_free_list;
3298 skdev->skspcl_free_list = (struct skd_special_context *)skspcl;
3299
3300 if (was_depleted) {
3301 DPRINTK(skdev, "skspcl was depleted\n");
3302 /* Free list was depleted. Their might be waiters. */
3303 wake_up_interruptible(&skdev->waitq);
3304 }
3305}
3306
3307static void skd_reset_skcomp(struct skd_device *skdev)
3308{
3309 u32 nbytes;
3310 struct fit_completion_entry_v1 *skcomp;
3311
3312 nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
3313 nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
3314
3315 memset(skdev->skcomp_table, 0, nbytes);
3316
3317 skdev->skcomp_ix = 0;
3318 skdev->skcomp_cycle = 1;
3319}
3320
3321/*
3322 *****************************************************************************
3323 * INTERRUPTS
3324 *****************************************************************************
3325 */
3326static void skd_completion_worker(struct work_struct *work)
3327{
3328 struct skd_device *skdev =
3329 container_of(work, struct skd_device, completion_worker);
3330 unsigned long flags;
3331 int flush_enqueued = 0;
3332
3333 spin_lock_irqsave(&skdev->lock, flags);
3334
3335 /*
3336 * pass in limit=0, which means no limit..
3337 * process everything in compq
3338 */
3339 skd_isr_completion_posted(skdev, 0, &flush_enqueued);
3340 skd_request_fn(skdev->queue);
3341
3342 spin_unlock_irqrestore(&skdev->lock, flags);
3343}
3344
3345static void skd_isr_msg_from_dev(struct skd_device *skdev);
3346
3347irqreturn_t
3348static skd_isr(int irq, void *ptr)
3349{
3350 struct skd_device *skdev;
3351 u32 intstat;
3352 u32 ack;
3353 int rc = 0;
3354 int deferred = 0;
3355 int flush_enqueued = 0;
3356
3357 skdev = (struct skd_device *)ptr;
3358 spin_lock(&skdev->lock);
3359
3360 for (;; ) {
3361 intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
3362
3363 ack = FIT_INT_DEF_MASK;
3364 ack &= intstat;
3365
3366 VPRINTK(skdev, "intstat=0x%x ack=0x%x\n", intstat, ack);
3367
3368 /* As long as there is an int pending on device, keep
3369 * running loop. When none, get out, but if we've never
3370 * done any processing, call completion handler?
3371 */
3372 if (ack == 0) {
3373 /* No interrupts on device, but run the completion
3374 * processor anyway?
3375 */
3376 if (rc == 0)
3377 if (likely (skdev->state
3378 == SKD_DRVR_STATE_ONLINE))
3379 deferred = 1;
3380 break;
3381 }
3382
3383 rc = IRQ_HANDLED;
3384
3385 SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
3386
3387 if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
3388 (skdev->state != SKD_DRVR_STATE_STOPPING))) {
3389 if (intstat & FIT_ISH_COMPLETION_POSTED) {
3390 /*
3391 * If we have already deferred completion
3392 * processing, don't bother running it again
3393 */
3394 if (deferred == 0)
3395 deferred =
3396 skd_isr_completion_posted(skdev,
3397 skd_isr_comp_limit, &flush_enqueued);
3398 }
3399
3400 if (intstat & FIT_ISH_FW_STATE_CHANGE) {
3401 skd_isr_fwstate(skdev);
3402 if (skdev->state == SKD_DRVR_STATE_FAULT ||
3403 skdev->state ==
3404 SKD_DRVR_STATE_DISAPPEARED) {
3405 spin_unlock(&skdev->lock);
3406 return rc;
3407 }
3408 }
3409
3410 if (intstat & FIT_ISH_MSG_FROM_DEV)
3411 skd_isr_msg_from_dev(skdev);
3412 }
3413 }
3414
3415 if (unlikely(flush_enqueued))
3416 skd_request_fn(skdev->queue);
3417
3418 if (deferred)
3419 schedule_work(&skdev->completion_worker);
3420 else if (!flush_enqueued)
3421 skd_request_fn(skdev->queue);
3422
3423 spin_unlock(&skdev->lock);
3424
3425 return rc;
3426}
3427
3428
3429static void skd_drive_fault(struct skd_device *skdev)
3430{
3431 skdev->state = SKD_DRVR_STATE_FAULT;
3432 pr_err("(%s): Drive FAULT\n", skd_name(skdev));
3433}
3434
3435static void skd_drive_disappeared(struct skd_device *skdev)
3436{
3437 skdev->state = SKD_DRVR_STATE_DISAPPEARED;
3438 pr_err("(%s): Drive DISAPPEARED\n", skd_name(skdev));
3439}
3440
3441static void skd_isr_fwstate(struct skd_device *skdev)
3442{
3443 u32 sense;
3444 u32 state;
3445 u32 mtd;
3446 int prev_driver_state = skdev->state;
3447
3448 sense = SKD_READL(skdev, FIT_STATUS);
3449 state = sense & FIT_SR_DRIVE_STATE_MASK;
3450
3451 pr_err("(%s): s1120 state %s(%d)=>%s(%d)\n",
3452 skd_name(skdev),
3453 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
3454 skd_drive_state_to_str(state), state);
3455
3456 skdev->drive_state = state;
3457
3458 switch (skdev->drive_state) {
3459 case FIT_SR_DRIVE_INIT:
3460 if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
3461 skd_disable_interrupts(skdev);
3462 break;
3463 }
3464 if (skdev->state == SKD_DRVR_STATE_RESTARTING)
3465 skd_recover_requests(skdev, 0);
3466 if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
3467 skdev->timer_countdown = SKD_STARTING_TIMO;
3468 skdev->state = SKD_DRVR_STATE_STARTING;
3469 skd_soft_reset(skdev);
3470 break;
3471 }
3472 mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
3473 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3474 skdev->last_mtd = mtd;
3475 break;
3476
3477 case FIT_SR_DRIVE_ONLINE:
3478 skdev->cur_max_queue_depth = skd_max_queue_depth;
3479 if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
3480 skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
3481
3482 skdev->queue_low_water_mark =
3483 skdev->cur_max_queue_depth * 2 / 3 + 1;
3484 if (skdev->queue_low_water_mark < 1)
3485 skdev->queue_low_water_mark = 1;
3486 pr_info(
3487 "(%s): Queue depth limit=%d dev=%d lowat=%d\n",
3488 skd_name(skdev),
3489 skdev->cur_max_queue_depth,
3490 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
3491
3492 skd_refresh_device_data(skdev);
3493 break;
3494
3495 case FIT_SR_DRIVE_BUSY:
3496 skdev->state = SKD_DRVR_STATE_BUSY;
3497 skdev->timer_countdown = SKD_BUSY_TIMO;
3498 skd_quiesce_dev(skdev);
3499 break;
3500 case FIT_SR_DRIVE_BUSY_SANITIZE:
3501 /* set timer for 3 seconds, we'll abort any unfinished
3502 * commands after that expires
3503 */
3504 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
3505 skdev->timer_countdown = SKD_TIMER_SECONDS(3);
3506 skd_start_queue(skdev);
3507 break;
3508 case FIT_SR_DRIVE_BUSY_ERASE:
3509 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
3510 skdev->timer_countdown = SKD_BUSY_TIMO;
3511 break;
3512 case FIT_SR_DRIVE_OFFLINE:
3513 skdev->state = SKD_DRVR_STATE_IDLE;
3514 break;
3515 case FIT_SR_DRIVE_SOFT_RESET:
3516 switch (skdev->state) {
3517 case SKD_DRVR_STATE_STARTING:
3518 case SKD_DRVR_STATE_RESTARTING:
3519 /* Expected by a caller of skd_soft_reset() */
3520 break;
3521 default:
3522 skdev->state = SKD_DRVR_STATE_RESTARTING;
3523 break;
3524 }
3525 break;
3526 case FIT_SR_DRIVE_FW_BOOTING:
3527 VPRINTK(skdev, "ISR FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
3528 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
3529 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
3530 break;
3531
3532 case FIT_SR_DRIVE_DEGRADED:
3533 case FIT_SR_PCIE_LINK_DOWN:
3534 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
3535 break;
3536
3537 case FIT_SR_DRIVE_FAULT:
3538 skd_drive_fault(skdev);
3539 skd_recover_requests(skdev, 0);
3540 skd_start_queue(skdev);
3541 break;
3542
3543 /* PCIe bus returned all Fs? */
3544 case 0xFF:
3545 pr_info("(%s): state=0x%x sense=0x%x\n",
3546 skd_name(skdev), state, sense);
3547 skd_drive_disappeared(skdev);
3548 skd_recover_requests(skdev, 0);
3549 skd_start_queue(skdev);
3550 break;
3551 default:
3552 /*
3553 * Uknown FW State. Wait for a state we recognize.
3554 */
3555 break;
3556 }
3557 pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
3558 skd_name(skdev),
3559 skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
3560 skd_skdev_state_to_str(skdev->state), skdev->state);
3561}
3562
3563static void skd_recover_requests(struct skd_device *skdev, int requeue)
3564{
3565 int i;
3566
3567 for (i = 0; i < skdev->num_req_context; i++) {
3568 struct skd_request_context *skreq = &skdev->skreq_table[i];
3569
3570 if (skreq->state == SKD_REQ_STATE_BUSY) {
3571 skd_log_skreq(skdev, skreq, "recover");
3572
3573 SKD_ASSERT((skreq->id & SKD_ID_INCR) != 0);
3574 if (!skd_bio)
3575 SKD_ASSERT(skreq->req != NULL);
3576 else
3577 SKD_ASSERT(skreq->bio != NULL);
3578
3579 /* Release DMA resources for the request. */
3580 if (skreq->n_sg > 0)
3581 skd_postop_sg_list(skdev, skreq);
3582
3583 if (!skd_bio) {
3584 if (requeue &&
3585 (unsigned long) ++skreq->req->special <
3586 SKD_MAX_RETRIES)
3587 skd_requeue_request(skdev, skreq);
3588 else
3589 skd_end_request(skdev, skreq, -EIO);
3590 } else
3591 skd_end_request(skdev, skreq, -EIO);
3592
3593 if (!skd_bio)
3594 skreq->req = NULL;
3595 else
3596 skreq->bio = NULL;
3597
3598 skreq->state = SKD_REQ_STATE_IDLE;
3599 skreq->id += SKD_ID_INCR;
3600
3601
3602 }
3603 if (i > 0)
3604 skreq[-1].next = skreq;
3605 skreq->next = NULL;
3606 }
3607 skdev->skreq_free_list = skdev->skreq_table;
3608
3609 for (i = 0; i < skdev->num_fitmsg_context; i++) {
3610 struct skd_fitmsg_context *skmsg = &skdev->skmsg_table[i];
3611
3612 if (skmsg->state == SKD_MSG_STATE_BUSY) {
3613 skd_log_skmsg(skdev, skmsg, "salvaged");
3614 SKD_ASSERT((skmsg->id & SKD_ID_INCR) != 0);
3615 skmsg->state = SKD_MSG_STATE_IDLE;
3616 skmsg->id += SKD_ID_INCR;
3617 }
3618 if (i > 0)
3619 skmsg[-1].next = skmsg;
3620 skmsg->next = NULL;
3621 }
3622 skdev->skmsg_free_list = skdev->skmsg_table;
3623
3624 for (i = 0; i < skdev->n_special; i++) {
3625 struct skd_special_context *skspcl = &skdev->skspcl_table[i];
3626
3627 /* If orphaned, reclaim it because it has already been reported
3628 * to the process as an error (it was just waiting for
3629 * a completion that didn't come, and now it will never come)
3630 * If busy, change to a state that will cause it to error
3631 * out in the wait routine and let it do the normal
3632 * reporting and reclaiming
3633 */
3634 if (skspcl->req.state == SKD_REQ_STATE_BUSY) {
3635 if (skspcl->orphaned) {
3636 DPRINTK(skdev, "orphaned %p\n", skspcl);
3637 skd_release_special(skdev, skspcl);
3638 } else {
3639 DPRINTK(skdev, "not orphaned %p\n", skspcl);
3640 skspcl->req.state = SKD_REQ_STATE_ABORTED;
3641 }
3642 }
3643 }
3644 skdev->skspcl_free_list = skdev->skspcl_table;
3645
3646 for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++)
3647 skdev->timeout_slot[i] = 0;
3648
3649 skdev->in_flight = 0;
3650}
3651
3652static void skd_isr_msg_from_dev(struct skd_device *skdev)
3653{
3654 u32 mfd;
3655 u32 mtd;
3656 u32 data;
3657
3658 mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
3659
3660 DPRINTK(skdev, "mfd=0x%x last_mtd=0x%x\n", mfd, skdev->last_mtd);
3661
3662 /* ignore any mtd that is an ack for something we didn't send */
3663 if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
3664 return;
3665
3666 switch (FIT_MXD_TYPE(mfd)) {
3667 case FIT_MTD_FITFW_INIT:
3668 skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
3669
3670 if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
3671 pr_err("(%s): protocol mismatch\n",
3672 skdev->name);
3673 pr_err("(%s): got=%d support=%d\n",
3674 skdev->name, skdev->proto_ver,
3675 FIT_PROTOCOL_VERSION_1);
3676 pr_err("(%s): please upgrade driver\n",
3677 skdev->name);
3678 skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
3679 skd_soft_reset(skdev);
3680 break;
3681 }
3682 mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
3683 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3684 skdev->last_mtd = mtd;
3685 break;
3686
3687 case FIT_MTD_GET_CMDQ_DEPTH:
3688 skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
3689 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
3690 SKD_N_COMPLETION_ENTRY);
3691 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3692 skdev->last_mtd = mtd;
3693 break;
3694
3695 case FIT_MTD_SET_COMPQ_DEPTH:
3696 SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
3697 mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
3698 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3699 skdev->last_mtd = mtd;
3700 break;
3701
3702 case FIT_MTD_SET_COMPQ_ADDR:
3703 skd_reset_skcomp(skdev);
3704 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
3705 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3706 skdev->last_mtd = mtd;
3707 break;
3708
3709 case FIT_MTD_CMD_LOG_HOST_ID:
3710 skdev->connect_time_stamp = get_seconds();
3711 data = skdev->connect_time_stamp & 0xFFFF;
3712 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
3713 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3714 skdev->last_mtd = mtd;
3715 break;
3716
3717 case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
3718 skdev->drive_jiffies = FIT_MXD_DATA(mfd);
3719 data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
3720 mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
3721 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3722 skdev->last_mtd = mtd;
3723 break;
3724
3725 case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
3726 skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
3727 mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
3728 SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
3729 skdev->last_mtd = mtd;
3730
3731 pr_err("(%s): Time sync driver=0x%x device=0x%x\n",
3732 skd_name(skdev),
3733 skdev->connect_time_stamp, skdev->drive_jiffies);
3734 break;
3735
3736 case FIT_MTD_ARM_QUEUE:
3737 skdev->last_mtd = 0;
3738 /*
3739 * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
3740 */
3741 break;
3742
3743 default:
3744 break;
3745 }
3746}
3747
3748static void skd_disable_interrupts(struct skd_device *skdev)
3749{
3750 u32 sense;
3751
3752 sense = SKD_READL(skdev, FIT_CONTROL);
3753 sense &= ~FIT_CR_ENABLE_INTERRUPTS;
3754 SKD_WRITEL(skdev, sense, FIT_CONTROL);
3755 DPRINTK(skdev, "sense 0x%x\n", sense);
3756
3757 /* Note that the 1s is written. A 1-bit means
3758 * disable, a 0 means enable.
3759 */
3760 SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
3761}
3762
3763static void skd_enable_interrupts(struct skd_device *skdev)
3764{
3765 u32 val;
3766
3767 /* unmask interrupts first */
3768 val = FIT_ISH_FW_STATE_CHANGE +
3769 FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
3770
3771 /* Note that the compliment of mask is written. A 1-bit means
3772 * disable, a 0 means enable. */
3773 SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
3774 DPRINTK(skdev, "interrupt mask=0x%x\n", ~val);
3775
3776 val = SKD_READL(skdev, FIT_CONTROL);
3777 val |= FIT_CR_ENABLE_INTERRUPTS;
3778 DPRINTK(skdev, "control=0x%x\n", val);
3779 SKD_WRITEL(skdev, val, FIT_CONTROL);
3780}
3781
3782/*
3783 *****************************************************************************
3784 * START, STOP, RESTART, QUIESCE, UNQUIESCE
3785 *****************************************************************************
3786 */
3787
3788static void skd_soft_reset(struct skd_device *skdev)
3789{
3790 u32 val;
3791
3792 val = SKD_READL(skdev, FIT_CONTROL);
3793 val |= (FIT_CR_SOFT_RESET);
3794 DPRINTK(skdev, "control=0x%x\n", val);
3795 SKD_WRITEL(skdev, val, FIT_CONTROL);
3796}
3797
3798static void skd_start_device(struct skd_device *skdev)
3799{
3800 unsigned long flags;
3801 u32 sense;
3802 u32 state;
3803
3804 spin_lock_irqsave(&skdev->lock, flags);
3805
3806 /* ack all ghost interrupts */
3807 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
3808
3809 sense = SKD_READL(skdev, FIT_STATUS);
3810
3811 DPRINTK(skdev, "initial status=0x%x\n", sense);
3812
3813 state = sense & FIT_SR_DRIVE_STATE_MASK;
3814 skdev->drive_state = state;
3815 skdev->last_mtd = 0;
3816
3817 skdev->state = SKD_DRVR_STATE_STARTING;
3818 skdev->timer_countdown = SKD_STARTING_TIMO;
3819
3820 skd_enable_interrupts(skdev);
3821
3822 switch (skdev->drive_state) {
3823 case FIT_SR_DRIVE_OFFLINE:
3824 pr_err("(%s): Drive offline...\n", skd_name(skdev));
3825 break;
3826
3827 case FIT_SR_DRIVE_FW_BOOTING:
3828 VPRINTK(skdev, "FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
3829 skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
3830 skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
3831 break;
3832
3833 case FIT_SR_DRIVE_BUSY_SANITIZE:
3834 pr_info("(%s): Start: BUSY_SANITIZE\n",
3835 skd_name(skdev));
3836 skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
3837 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3838 break;
3839
3840 case FIT_SR_DRIVE_BUSY_ERASE:
3841 pr_info("(%s): Start: BUSY_ERASE\n", skd_name(skdev));
3842 skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
3843 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3844 break;
3845
3846 case FIT_SR_DRIVE_INIT:
3847 case FIT_SR_DRIVE_ONLINE:
3848 skd_soft_reset(skdev);
3849 break;
3850
3851 case FIT_SR_DRIVE_BUSY:
3852 pr_err("(%s): Drive Busy...\n", skd_name(skdev));
3853 skdev->state = SKD_DRVR_STATE_BUSY;
3854 skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
3855 break;
3856
3857 case FIT_SR_DRIVE_SOFT_RESET:
3858 pr_err("(%s) drive soft reset in prog\n",
3859 skd_name(skdev));
3860 break;
3861
3862 case FIT_SR_DRIVE_FAULT:
3863 /* Fault state is bad...soft reset won't do it...
3864 * Hard reset, maybe, but does it work on device?
3865 * For now, just fault so the system doesn't hang.
3866 */
3867 skd_drive_fault(skdev);
3868 /*start the queue so we can respond with error to requests */
3869 VPRINTK(skdev, "starting %s queue\n", skdev->name);
3870 skd_start_queue(skdev);
3871 skdev->gendisk_on = -1;
3872 wake_up_interruptible(&skdev->waitq);
3873 break;
3874
3875 case 0xFF:
3876 /* Most likely the device isn't there or isn't responding
3877 * to the BAR1 addresses. */
3878 skd_drive_disappeared(skdev);
3879 /*start the queue so we can respond with error to requests */
3880 VPRINTK(skdev, "starting %s queue to error-out reqs\n",
3881 skdev->name);
3882 skd_start_queue(skdev);
3883 skdev->gendisk_on = -1;
3884 wake_up_interruptible(&skdev->waitq);
3885 break;
3886
3887 default:
3888 pr_err("(%s) Start: unknown state %x\n",
3889 skd_name(skdev), skdev->drive_state);
3890 break;
3891 }
3892
3893 state = SKD_READL(skdev, FIT_CONTROL);
3894 DPRINTK(skdev, "FIT Control Status=0x%x\n", state);
3895
3896 state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
3897 DPRINTK(skdev, "Intr Status=0x%x\n", state);
3898
3899 state = SKD_READL(skdev, FIT_INT_MASK_HOST);
3900 DPRINTK(skdev, "Intr Mask=0x%x\n", state);
3901
3902 state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
3903 DPRINTK(skdev, "Msg from Dev=0x%x\n", state);
3904
3905 state = SKD_READL(skdev, FIT_HW_VERSION);
3906 DPRINTK(skdev, "HW version=0x%x\n", state);
3907
3908 spin_unlock_irqrestore(&skdev->lock, flags);
3909}
3910
3911static void skd_stop_device(struct skd_device *skdev)
3912{
3913 unsigned long flags;
3914 struct skd_special_context *skspcl = &skdev->internal_skspcl;
3915 u32 dev_state;
3916 int i;
3917
3918 spin_lock_irqsave(&skdev->lock, flags);
3919
3920 if (skdev->state != SKD_DRVR_STATE_ONLINE) {
3921 pr_err("(%s): skd_stop_device not online no sync\n",
3922 skd_name(skdev));
3923 goto stop_out;
3924 }
3925
3926 if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
3927 pr_err("(%s): skd_stop_device no special\n",
3928 skd_name(skdev));
3929 goto stop_out;
3930 }
3931
3932 skdev->state = SKD_DRVR_STATE_SYNCING;
3933 skdev->sync_done = 0;
3934
3935 skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
3936
3937 spin_unlock_irqrestore(&skdev->lock, flags);
3938
3939 wait_event_interruptible_timeout(skdev->waitq,
3940 (skdev->sync_done), (10 * HZ));
3941
3942 spin_lock_irqsave(&skdev->lock, flags);
3943
3944 switch (skdev->sync_done) {
3945 case 0:
3946 pr_err("(%s): skd_stop_device no sync\n",
3947 skd_name(skdev));
3948 break;
3949 case 1:
3950 pr_err("(%s): skd_stop_device sync done\n",
3951 skd_name(skdev));
3952 break;
3953 default:
3954 pr_err("(%s): skd_stop_device sync error\n",
3955 skd_name(skdev));
3956 }
3957
3958stop_out:
3959 skdev->state = SKD_DRVR_STATE_STOPPING;
3960 spin_unlock_irqrestore(&skdev->lock, flags);
3961
3962 skd_kill_timer(skdev);
3963
3964 spin_lock_irqsave(&skdev->lock, flags);
3965 skd_disable_interrupts(skdev);
3966
3967 /* ensure all ints on device are cleared */
3968 /* soft reset the device to unload with a clean slate */
3969 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
3970 SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
3971
3972 spin_unlock_irqrestore(&skdev->lock, flags);
3973
3974 /* poll every 100ms, 1 second timeout */
3975 for (i = 0; i < 10; i++) {
3976 dev_state =
3977 SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
3978 if (dev_state == FIT_SR_DRIVE_INIT)
3979 break;
3980 set_current_state(TASK_INTERRUPTIBLE);
3981 schedule_timeout(msecs_to_jiffies(100));
3982 }
3983
3984 if (dev_state != FIT_SR_DRIVE_INIT)
3985 pr_err("(%s): skd_stop_device state error 0x%02x\n",
3986 skd_name(skdev), dev_state);
3987}
3988
3989/* assume spinlock is held */
3990static void skd_restart_device(struct skd_device *skdev)
3991{
3992 u32 state;
3993
3994 /* ack all ghost interrupts */
3995 SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
3996
3997 state = SKD_READL(skdev, FIT_STATUS);
3998
3999 DPRINTK(skdev, "drive status=0x%x\n", state);
4000
4001 state &= FIT_SR_DRIVE_STATE_MASK;
4002 skdev->drive_state = state;
4003 skdev->last_mtd = 0;
4004
4005 skdev->state = SKD_DRVR_STATE_RESTARTING;
4006 skdev->timer_countdown = SKD_RESTARTING_TIMO;
4007
4008 skd_soft_reset(skdev);
4009}
4010
4011/* assume spinlock is held */
4012static int skd_quiesce_dev(struct skd_device *skdev)
4013{
4014 int rc = 0;
4015
4016 switch (skdev->state) {
4017 case SKD_DRVR_STATE_BUSY:
4018 case SKD_DRVR_STATE_BUSY_IMMINENT:
4019 VPRINTK(skdev, "stopping %s queue\n", skdev->name);
4020 skd_stop_queue(skdev);
4021 break;
4022 case SKD_DRVR_STATE_ONLINE:
4023 case SKD_DRVR_STATE_STOPPING:
4024 case SKD_DRVR_STATE_SYNCING:
4025 case SKD_DRVR_STATE_PAUSING:
4026 case SKD_DRVR_STATE_PAUSED:
4027 case SKD_DRVR_STATE_STARTING:
4028 case SKD_DRVR_STATE_RESTARTING:
4029 case SKD_DRVR_STATE_RESUMING:
4030 default:
4031 rc = -EINVAL;
4032 VPRINTK(skdev, "state [%d] not implemented\n", skdev->state);
4033 }
4034 return rc;
4035}
4036
4037/* assume spinlock is held */
4038static int skd_unquiesce_dev(struct skd_device *skdev)
4039{
4040 int prev_driver_state = skdev->state;
4041
4042 skd_log_skdev(skdev, "unquiesce");
4043 if (skdev->state == SKD_DRVR_STATE_ONLINE) {
4044 DPRINTK(skdev, "**** device already ONLINE\n");
4045 return 0;
4046 }
4047 if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
4048 /*
4049 * If there has been an state change to other than
4050 * ONLINE, we will rely on controller state change
4051 * to come back online and restart the queue.
4052 * The BUSY state means that driver is ready to
4053 * continue normal processing but waiting for controller
4054 * to become available.
4055 */
4056 skdev->state = SKD_DRVR_STATE_BUSY;
4057 DPRINTK(skdev, "drive BUSY state\n");
4058 return 0;
4059 }
4060
4061 /*
4062 * Drive has just come online, driver is either in startup,
4063 * paused performing a task, or bust waiting for hardware.
4064 */
4065 switch (skdev->state) {
4066 case SKD_DRVR_STATE_PAUSED:
4067 case SKD_DRVR_STATE_BUSY:
4068 case SKD_DRVR_STATE_BUSY_IMMINENT:
4069 case SKD_DRVR_STATE_BUSY_ERASE:
4070 case SKD_DRVR_STATE_STARTING:
4071 case SKD_DRVR_STATE_RESTARTING:
4072 case SKD_DRVR_STATE_FAULT:
4073 case SKD_DRVR_STATE_IDLE:
4074 case SKD_DRVR_STATE_LOAD:
4075 skdev->state = SKD_DRVR_STATE_ONLINE;
4076 pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
4077 skd_name(skdev),
4078 skd_skdev_state_to_str(prev_driver_state),
4079 prev_driver_state, skd_skdev_state_to_str(skdev->state),
4080 skdev->state);
4081 DPRINTK(skdev, "**** device ONLINE...starting block queue\n");
4082 VPRINTK(skdev, "starting %s queue\n", skdev->name);
4083 pr_info("(%s): STEC s1120 ONLINE\n", skd_name(skdev));
4084 skd_start_queue(skdev);
4085 skdev->gendisk_on = 1;
4086 wake_up_interruptible(&skdev->waitq);
4087 break;
4088
4089 case SKD_DRVR_STATE_DISAPPEARED:
4090 default:
4091 DPRINTK(skdev, "**** driver state %d, not implemented \n",
4092 skdev->state);
4093 return -EBUSY;
4094 }
4095 return 0;
4096}
4097
4098/*
4099 *****************************************************************************
4100 * PCIe MSI/MSI-X INTERRUPT HANDLERS
4101 *****************************************************************************
4102 */
4103
4104static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
4105{
4106 struct skd_device *skdev = skd_host_data;
4107 unsigned long flags;
4108
4109 spin_lock_irqsave(&skdev->lock, flags);
4110 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4111 pr_err("(%s): MSIX reserved irq %d = 0x%x\n", skd_name(skdev),
4112 irq, SKD_READL(skdev, FIT_INT_STATUS_HOST));
4113 SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
4114 spin_unlock_irqrestore(&skdev->lock, flags);
4115 return IRQ_HANDLED;
4116}
4117
4118static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
4119{
4120 struct skd_device *skdev = skd_host_data;
4121 unsigned long flags;
4122
4123 spin_lock_irqsave(&skdev->lock, flags);
4124 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4125 SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
4126 skd_isr_fwstate(skdev);
4127 spin_unlock_irqrestore(&skdev->lock, flags);
4128 return IRQ_HANDLED;
4129}
4130
4131static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
4132{
4133 struct skd_device *skdev = skd_host_data;
4134 unsigned long flags;
4135 int flush_enqueued = 0;
4136 int deferred;
4137
4138 spin_lock_irqsave(&skdev->lock, flags);
4139 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4140 SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
4141 deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
4142 &flush_enqueued);
4143
4144 if (flush_enqueued)
4145 skd_request_fn(skdev->queue);
4146
4147 if (deferred)
4148 schedule_work(&skdev->completion_worker);
4149 else if (!flush_enqueued)
4150 skd_request_fn(skdev->queue);
4151
4152 spin_unlock_irqrestore(&skdev->lock, flags);
4153
4154 return IRQ_HANDLED;
4155}
4156
4157static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
4158{
4159 struct skd_device *skdev = skd_host_data;
4160 unsigned long flags;
4161
4162 spin_lock_irqsave(&skdev->lock, flags);
4163 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4164 SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
4165 skd_isr_msg_from_dev(skdev);
4166 spin_unlock_irqrestore(&skdev->lock, flags);
4167 return IRQ_HANDLED;
4168}
4169
4170static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
4171{
4172 struct skd_device *skdev = skd_host_data;
4173 unsigned long flags;
4174
4175 spin_lock_irqsave(&skdev->lock, flags);
4176 VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
4177 SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
4178 spin_unlock_irqrestore(&skdev->lock, flags);
4179 return IRQ_HANDLED;
4180}
4181
4182/*
4183 *****************************************************************************
4184 * PCIe MSI/MSI-X SETUP
4185 *****************************************************************************
4186 */
4187
4188struct skd_msix_entry {
4189 int have_irq;
4190 u32 vector;
4191 u32 entry;
4192 struct skd_device *rsp;
4193 char isr_name[30];
4194};
4195
4196struct skd_init_msix_entry {
4197 const char *name;
4198 irq_handler_t handler;
4199};
4200
4201#define SKD_MAX_MSIX_COUNT 13
4202#define SKD_MIN_MSIX_COUNT 7
4203#define SKD_BASE_MSIX_IRQ 4
4204
4205static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
4206 { "(DMA 0)", skd_reserved_isr },
4207 { "(DMA 1)", skd_reserved_isr },
4208 { "(DMA 2)", skd_reserved_isr },
4209 { "(DMA 3)", skd_reserved_isr },
4210 { "(State Change)", skd_statec_isr },
4211 { "(COMPL_Q)", skd_comp_q },
4212 { "(MSG)", skd_msg_isr },
4213 { "(Reserved)", skd_reserved_isr },
4214 { "(Reserved)", skd_reserved_isr },
4215 { "(Queue Full 0)", skd_qfull_isr },
4216 { "(Queue Full 1)", skd_qfull_isr },
4217 { "(Queue Full 2)", skd_qfull_isr },
4218 { "(Queue Full 3)", skd_qfull_isr },
4219};
4220
4221static void skd_release_msix(struct skd_device *skdev)
4222{
4223 struct skd_msix_entry *qentry;
4224 int i;
4225
4226 if (skdev->msix_entries == NULL)
4227 return;
4228 for (i = 0; i < skdev->msix_count; i++) {
4229 qentry = &skdev->msix_entries[i];
4230 skdev = qentry->rsp;
4231
4232 if (qentry->have_irq)
4233 devm_free_irq(&skdev->pdev->dev,
4234 qentry->vector, qentry->rsp);
4235 }
4236 pci_disable_msix(skdev->pdev);
4237 kfree(skdev->msix_entries);
4238 skdev->msix_count = 0;
4239 skdev->msix_entries = NULL;
4240}
4241
4242static int skd_acquire_msix(struct skd_device *skdev)
4243{
4244 int i, rc;
4245 struct pci_dev *pdev;
4246 struct msix_entry *entries = NULL;
4247 struct skd_msix_entry *qentry;
4248
4249 pdev = skdev->pdev;
4250 skdev->msix_count = SKD_MAX_MSIX_COUNT;
4251 entries = kzalloc(sizeof(struct msix_entry) * SKD_MAX_MSIX_COUNT,
4252 GFP_KERNEL);
4253 if (!entries)
4254 return -ENOMEM;
4255
4256 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++)
4257 entries[i].entry = i;
4258
4259 rc = pci_enable_msix(pdev, entries, SKD_MAX_MSIX_COUNT);
4260 if (rc < 0)
4261 goto msix_out;
4262 if (rc) {
4263 if (rc < SKD_MIN_MSIX_COUNT) {
4264 pr_err("(%s): failed to enable MSI-X %d\n",
4265 skd_name(skdev), rc);
4266 goto msix_out;
4267 }
4268 DPRINTK(skdev, "%s: <%s> allocated %d MSI-X vectors\n",
4269 pci_name(pdev), skdev->name, rc);
4270
4271 skdev->msix_count = rc;
4272 rc = pci_enable_msix(pdev, entries, skdev->msix_count);
4273 if (rc) {
4274 pr_err("(%s): failed to enable MSI-X "
4275 "support (%d) %d\n",
4276 skd_name(skdev), skdev->msix_count, rc);
4277 goto msix_out;
4278 }
4279 }
4280 skdev->msix_entries = kzalloc(sizeof(struct skd_msix_entry) *
4281 skdev->msix_count, GFP_KERNEL);
4282 if (!skdev->msix_entries) {
4283 rc = -ENOMEM;
4284 skdev->msix_count = 0;
4285 pr_err("(%s): msix table allocation error\n",
4286 skd_name(skdev));
4287 goto msix_out;
4288 }
4289
4290 qentry = skdev->msix_entries;
4291 for (i = 0; i < skdev->msix_count; i++) {
4292 qentry->vector = entries[i].vector;
4293 qentry->entry = entries[i].entry;
4294 qentry->rsp = NULL;
4295 qentry->have_irq = 0;
4296 DPRINTK(skdev, "%s: <%s> msix (%d) vec %d, entry %x\n",
4297 pci_name(pdev), skdev->name,
4298 i, qentry->vector, qentry->entry);
4299 qentry++;
4300 }
4301
4302 /* Enable MSI-X vectors for the base queue */
4303 for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
4304 qentry = &skdev->msix_entries[i];
4305 snprintf(qentry->isr_name, sizeof(qentry->isr_name),
4306 "%s%d-msix %s", DRV_NAME, skdev->devno,
4307 msix_entries[i].name);
4308 rc = devm_request_irq(&skdev->pdev->dev, qentry->vector,
4309 msix_entries[i].handler, 0,
4310 qentry->isr_name, skdev);
4311 if (rc) {
4312 pr_err("(%s): Unable to register(%d) MSI-X "
4313 "handler %d: %s\n",
4314 skd_name(skdev), rc, i, qentry->isr_name);
4315 goto msix_out;
4316 } else {
4317 qentry->have_irq = 1;
4318 qentry->rsp = skdev;
4319 }
4320 }
4321 DPRINTK(skdev, "%s: <%s> msix %d irq(s) enabled\n",
4322 pci_name(pdev), skdev->name, skdev->msix_count);
4323 return 0;
4324
4325msix_out:
4326 if (entries)
4327 kfree(entries);
4328 skd_release_msix(skdev);
4329 return rc;
4330}
4331
4332static int skd_acquire_irq(struct skd_device *skdev)
4333{
4334 int rc;
4335 struct pci_dev *pdev;
4336
4337 pdev = skdev->pdev;
4338 skdev->msix_count = 0;
4339
4340RETRY_IRQ_TYPE:
4341 switch (skdev->irq_type) {
4342 case SKD_IRQ_MSIX:
4343 rc = skd_acquire_msix(skdev);
4344 if (!rc)
4345 pr_info("(%s): MSI-X %d irqs enabled\n",
4346 skd_name(skdev), skdev->msix_count);
4347 else {
4348 pr_err(
4349 "(%s): failed to enable MSI-X, re-trying with MSI %d\n",
4350 skd_name(skdev), rc);
4351 skdev->irq_type = SKD_IRQ_MSI;
4352 goto RETRY_IRQ_TYPE;
4353 }
4354 break;
4355 case SKD_IRQ_MSI:
4356 snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d-msi",
4357 DRV_NAME, skdev->devno);
4358 rc = pci_enable_msi(pdev);
4359 if (!rc) {
4360 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, 0,
4361 skdev->isr_name, skdev);
4362 if (rc) {
4363 pci_disable_msi(pdev);
4364 pr_err(
4365 "(%s): failed to allocate the MSI interrupt %d\n",
4366 skd_name(skdev), rc);
4367 goto RETRY_IRQ_LEGACY;
4368 }
4369 pr_info("(%s): MSI irq %d enabled\n",
4370 skd_name(skdev), pdev->irq);
4371 } else {
4372RETRY_IRQ_LEGACY:
4373 pr_err(
4374 "(%s): failed to enable MSI, re-trying with LEGACY %d\n",
4375 skd_name(skdev), rc);
4376 skdev->irq_type = SKD_IRQ_LEGACY;
4377 goto RETRY_IRQ_TYPE;
4378 }
4379 break;
4380 case SKD_IRQ_LEGACY:
4381 snprintf(skdev->isr_name, sizeof(skdev->isr_name),
4382 "%s%d-legacy", DRV_NAME, skdev->devno);
4383 rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
4384 IRQF_SHARED, skdev->isr_name, skdev);
4385 if (!rc)
4386 pr_info("(%s): LEGACY irq %d enabled\n",
4387 skd_name(skdev), pdev->irq);
4388 else
4389 pr_err("(%s): request LEGACY irq error %d\n",
4390 skd_name(skdev), rc);
4391 break;
4392 default:
4393 pr_info("(%s): irq_type %d invalid, re-set to %d\n",
4394 skd_name(skdev), skdev->irq_type, SKD_IRQ_DEFAULT);
4395 skdev->irq_type = SKD_IRQ_LEGACY;
4396 goto RETRY_IRQ_TYPE;
4397 }
4398 return rc;
4399}
4400
4401static void skd_release_irq(struct skd_device *skdev)
4402{
4403 switch (skdev->irq_type) {
4404 case SKD_IRQ_MSIX:
4405 skd_release_msix(skdev);
4406 break;
4407 case SKD_IRQ_MSI:
4408 devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
4409 pci_disable_msi(skdev->pdev);
4410 break;
4411 case SKD_IRQ_LEGACY:
4412 devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
4413 break;
4414 default:
4415 pr_err("(%s): wrong irq type %d!",
4416 skd_name(skdev), skdev->irq_type);
4417 break;
4418 }
4419}
4420
4421/*
4422 *****************************************************************************
4423 * CONSTRUCT
4424 *****************************************************************************
4425 */
4426
4427static int skd_cons_skcomp(struct skd_device *skdev);
4428static int skd_cons_skmsg(struct skd_device *skdev);
4429static int skd_cons_skreq(struct skd_device *skdev);
4430static int skd_cons_skspcl(struct skd_device *skdev);
4431static int skd_cons_sksb(struct skd_device *skdev);
4432static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
4433 u32 n_sg,
4434 dma_addr_t *ret_dma_addr);
4435static int skd_cons_disk(struct skd_device *skdev);
4436
4437#define SKD_N_DEV_TABLE 16u
4438static u32 skd_next_devno;
4439
4440static struct skd_device *skd_construct(struct pci_dev *pdev)
4441{
4442 struct skd_device *skdev;
4443 int blk_major = skd_major;
4444 int rc;
4445
4446 skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
4447
4448 if (!skdev) {
4449 pr_err(PFX "(%s): memory alloc failure\n",
4450 pci_name(pdev));
4451 return NULL;
4452 }
4453
4454 skdev->state = SKD_DRVR_STATE_LOAD;
4455 skdev->pdev = pdev;
4456 skdev->devno = skd_next_devno++;
4457 skdev->major = blk_major;
4458 skdev->irq_type = skd_isr_type;
4459 sprintf(skdev->name, DRV_NAME "%d", skdev->devno);
4460 skdev->dev_max_queue_depth = 0;
4461
4462 skdev->num_req_context = skd_max_queue_depth;
4463 skdev->num_fitmsg_context = skd_max_queue_depth;
4464 skdev->n_special = skd_max_pass_thru;
4465 skdev->cur_max_queue_depth = 1;
4466 skdev->queue_low_water_mark = 1;
4467 skdev->proto_ver = 99;
4468 skdev->sgs_per_request = skd_sgs_per_request;
4469 skdev->dbg_level = skd_dbg_level;
4470
4471 if (skd_bio)
4472 bio_list_init(&skdev->bio_queue);
4473
4474
4475 atomic_set(&skdev->device_count, 0);
4476
4477 spin_lock_init(&skdev->lock);
4478
4479 INIT_WORK(&skdev->completion_worker, skd_completion_worker);
4480 INIT_LIST_HEAD(&skdev->flush_list);
4481
4482 VPRINTK(skdev, "skcomp\n");
4483 rc = skd_cons_skcomp(skdev);
4484 if (rc < 0)
4485 goto err_out;
4486
4487 VPRINTK(skdev, "skmsg\n");
4488 rc = skd_cons_skmsg(skdev);
4489 if (rc < 0)
4490 goto err_out;
4491
4492 VPRINTK(skdev, "skreq\n");
4493 rc = skd_cons_skreq(skdev);
4494 if (rc < 0)
4495 goto err_out;
4496
4497 VPRINTK(skdev, "skspcl\n");
4498 rc = skd_cons_skspcl(skdev);
4499 if (rc < 0)
4500 goto err_out;
4501
4502 VPRINTK(skdev, "sksb\n");
4503 rc = skd_cons_sksb(skdev);
4504 if (rc < 0)
4505 goto err_out;
4506
4507 VPRINTK(skdev, "disk\n");
4508 rc = skd_cons_disk(skdev);
4509 if (rc < 0)
4510 goto err_out;
4511
4512
4513
4514 DPRINTK(skdev, "VICTORY\n");
4515 return skdev;
4516
4517err_out:
4518 DPRINTK(skdev, "construct failed\n");
4519 skd_destruct(skdev);
4520 return NULL;
4521}
4522
4523static int skd_cons_skcomp(struct skd_device *skdev)
4524{
4525 int rc = 0;
4526 struct fit_completion_entry_v1 *skcomp;
4527 u32 nbytes;
4528
4529 nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
4530 nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
4531
4532 VPRINTK(skdev, "comp pci_alloc, total bytes %d entries %d\n", nbytes,
4533 SKD_N_COMPLETION_ENTRY);
4534
4535 skcomp = pci_alloc_consistent(skdev->pdev, nbytes,
4536 &skdev->cq_dma_address);
4537
4538 if (skcomp == NULL) {
4539 rc = -ENOMEM;
4540 goto err_out;
4541 }
4542
4543 memset(skcomp, 0, nbytes);
4544
4545 skdev->skcomp_table = skcomp;
4546 skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
4547 sizeof(*skcomp) *
4548 SKD_N_COMPLETION_ENTRY);
4549
4550err_out:
4551 return rc;
4552}
4553
4554static int skd_cons_skmsg(struct skd_device *skdev)
4555{
4556 int rc = 0;
4557 u32 i;
4558
4559 VPRINTK(skdev, "skmsg_table kzalloc, struct %u, count %u total %lu\n",
4560 sizeof(struct skd_fitmsg_context),
4561 skdev->num_fitmsg_context,
4562 (unsigned long) sizeof(struct skd_fitmsg_context) *
4563 skdev->num_fitmsg_context);
4564
4565 skdev->skmsg_table = kzalloc(sizeof(struct skd_fitmsg_context)
4566 *skdev->num_fitmsg_context, GFP_KERNEL);
4567 if (skdev->skmsg_table == NULL) {
4568 rc = -ENOMEM;
4569 goto err_out;
4570 }
4571
4572 for (i = 0; i < skdev->num_fitmsg_context; i++) {
4573 struct skd_fitmsg_context *skmsg;
4574
4575 skmsg = &skdev->skmsg_table[i];
4576
4577 skmsg->id = i + SKD_ID_FIT_MSG;
4578
4579 skmsg->state = SKD_MSG_STATE_IDLE;
4580 skmsg->msg_buf = pci_alloc_consistent(skdev->pdev,
4581 SKD_N_FITMSG_BYTES + 64,
4582 &skmsg->mb_dma_address);
4583
4584 if (skmsg->msg_buf == NULL) {
4585 rc = -ENOMEM;
4586 goto err_out;
4587 }
4588
4589 skmsg->offset = (u32)((u64)skmsg->msg_buf &
4590 (~FIT_QCMD_BASE_ADDRESS_MASK));
4591 skmsg->msg_buf += ~FIT_QCMD_BASE_ADDRESS_MASK;
4592 skmsg->msg_buf = (u8 *)((u64)skmsg->msg_buf &
4593 FIT_QCMD_BASE_ADDRESS_MASK);
4594 skmsg->mb_dma_address += ~FIT_QCMD_BASE_ADDRESS_MASK;
4595 skmsg->mb_dma_address &= FIT_QCMD_BASE_ADDRESS_MASK;
4596 memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
4597
4598 skmsg->next = &skmsg[1];
4599 }
4600
4601 /* Free list is in order starting with the 0th entry. */
4602 skdev->skmsg_table[i - 1].next = NULL;
4603 skdev->skmsg_free_list = skdev->skmsg_table;
4604
4605err_out:
4606 return rc;
4607}
4608
4609static int skd_cons_skreq(struct skd_device *skdev)
4610{
4611 int rc = 0;
4612 u32 i;
4613
4614 VPRINTK(skdev, "skreq_table kzalloc, struct %u, count %u total %u\n",
4615 sizeof(struct skd_request_context),
4616 skdev->num_req_context,
4617 sizeof(struct skd_request_context) * skdev->num_req_context);
4618
4619 skdev->skreq_table = kzalloc(sizeof(struct skd_request_context)
4620 * skdev->num_req_context, GFP_KERNEL);
4621 if (skdev->skreq_table == NULL) {
4622 rc = -ENOMEM;
4623 goto err_out;
4624 }
4625
4626 VPRINTK(skdev, "alloc sg_table sg_per_req %u scatlist %u total %u\n",
4627 skdev->sgs_per_request, sizeof(struct scatterlist),
4628 skdev->sgs_per_request * sizeof(struct scatterlist));
4629
4630 for (i = 0; i < skdev->num_req_context; i++) {
4631 struct skd_request_context *skreq;
4632
4633 skreq = &skdev->skreq_table[i];
4634
4635 skreq->id = i + SKD_ID_RW_REQUEST;
4636 skreq->state = SKD_REQ_STATE_IDLE;
4637
4638 skreq->sg = kzalloc(sizeof(struct scatterlist) *
4639 skdev->sgs_per_request, GFP_KERNEL);
4640 if (skreq->sg == NULL) {
4641 rc = -ENOMEM;
4642 goto err_out;
4643 }
4644 sg_init_table(skreq->sg, skdev->sgs_per_request);
4645
4646 skreq->sksg_list = skd_cons_sg_list(skdev,
4647 skdev->sgs_per_request,
4648 &skreq->sksg_dma_address);
4649
4650 if (skreq->sksg_list == NULL) {
4651 rc = -ENOMEM;
4652 goto err_out;
4653 }
4654
4655 skreq->next = &skreq[1];
4656 }
4657
4658 /* Free list is in order starting with the 0th entry. */
4659 skdev->skreq_table[i - 1].next = NULL;
4660 skdev->skreq_free_list = skdev->skreq_table;
4661
4662err_out:
4663 return rc;
4664}
4665
4666static int skd_cons_skspcl(struct skd_device *skdev)
4667{
4668 int rc = 0;
4669 u32 i, nbytes;
4670
4671 VPRINTK(skdev, "skspcl_table kzalloc, struct %u, count %u total %u\n",
4672 sizeof(struct skd_special_context),
4673 skdev->n_special,
4674 sizeof(struct skd_special_context) * skdev->n_special);
4675
4676 skdev->skspcl_table = kzalloc(sizeof(struct skd_special_context)
4677 * skdev->n_special, GFP_KERNEL);
4678 if (skdev->skspcl_table == NULL) {
4679 rc = -ENOMEM;
4680 goto err_out;
4681 }
4682
4683 for (i = 0; i < skdev->n_special; i++) {
4684 struct skd_special_context *skspcl;
4685
4686 skspcl = &skdev->skspcl_table[i];
4687
4688 skspcl->req.id = i + SKD_ID_SPECIAL_REQUEST;
4689 skspcl->req.state = SKD_REQ_STATE_IDLE;
4690
4691 skspcl->req.next = &skspcl[1].req;
4692
4693 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
4694
4695 skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4696 &skspcl->mb_dma_address);
4697 if (skspcl->msg_buf == NULL) {
4698 rc = -ENOMEM;
4699 goto err_out;
4700 }
4701
4702 memset(skspcl->msg_buf, 0, nbytes);
4703
4704 skspcl->req.sg = kzalloc(sizeof(struct scatterlist) *
4705 SKD_N_SG_PER_SPECIAL, GFP_KERNEL);
4706 if (skspcl->req.sg == NULL) {
4707 rc = -ENOMEM;
4708 goto err_out;
4709 }
4710
4711 skspcl->req.sksg_list = skd_cons_sg_list(skdev,
4712 SKD_N_SG_PER_SPECIAL,
4713 &skspcl->req.
4714 sksg_dma_address);
4715 if (skspcl->req.sksg_list == NULL) {
4716 rc = -ENOMEM;
4717 goto err_out;
4718 }
4719 }
4720
4721 /* Free list is in order starting with the 0th entry. */
4722 skdev->skspcl_table[i - 1].req.next = NULL;
4723 skdev->skspcl_free_list = skdev->skspcl_table;
4724
4725 return rc;
4726
4727err_out:
4728 return rc;
4729}
4730
4731static int skd_cons_sksb(struct skd_device *skdev)
4732{
4733 int rc = 0;
4734 struct skd_special_context *skspcl;
4735 u32 nbytes;
4736
4737 skspcl = &skdev->internal_skspcl;
4738
4739 skspcl->req.id = 0 + SKD_ID_INTERNAL;
4740 skspcl->req.state = SKD_REQ_STATE_IDLE;
4741
4742 nbytes = SKD_N_INTERNAL_BYTES;
4743
4744 skspcl->data_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4745 &skspcl->db_dma_address);
4746 if (skspcl->data_buf == NULL) {
4747 rc = -ENOMEM;
4748 goto err_out;
4749 }
4750
4751 memset(skspcl->data_buf, 0, nbytes);
4752
4753 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
4754 skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
4755 &skspcl->mb_dma_address);
4756 if (skspcl->msg_buf == NULL) {
4757 rc = -ENOMEM;
4758 goto err_out;
4759 }
4760
4761 memset(skspcl->msg_buf, 0, nbytes);
4762
4763 skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
4764 &skspcl->req.sksg_dma_address);
4765 if (skspcl->req.sksg_list == NULL) {
4766 rc = -ENOMEM;
4767 goto err_out;
4768 }
4769
4770 if (!skd_format_internal_skspcl(skdev)) {
4771 rc = -EINVAL;
4772 goto err_out;
4773 }
4774
4775err_out:
4776 return rc;
4777}
4778
4779static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
4780 u32 n_sg,
4781 dma_addr_t *ret_dma_addr)
4782{
4783 struct fit_sg_descriptor *sg_list;
4784 u32 nbytes;
4785
4786 nbytes = sizeof(*sg_list) * n_sg;
4787
4788 sg_list = pci_alloc_consistent(skdev->pdev, nbytes, ret_dma_addr);
4789
4790 if (sg_list != NULL) {
4791 uint64_t dma_address = *ret_dma_addr;
4792 u32 i;
4793
4794 memset(sg_list, 0, nbytes);
4795
4796 for (i = 0; i < n_sg - 1; i++) {
4797 uint64_t ndp_off;
4798 ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
4799
4800 sg_list[i].next_desc_ptr = dma_address + ndp_off;
4801 }
4802 sg_list[i].next_desc_ptr = 0LL;
4803 }
4804
4805 return sg_list;
4806}
4807
4808static int skd_cons_disk(struct skd_device *skdev)
4809{
4810 int rc = 0;
4811 struct gendisk *disk;
4812 struct request_queue *q;
4813 unsigned long flags;
4814
4815 disk = alloc_disk(SKD_MINORS_PER_DEVICE);
4816 if (!disk) {
4817 rc = -ENOMEM;
4818 goto err_out;
4819 }
4820
4821 skdev->disk = disk;
4822 sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
4823
4824 disk->major = skdev->major;
4825 disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
4826 disk->fops = &skd_blockdev_ops;
4827 disk->private_data = skdev;
4828
4829 if (!skd_bio) {
4830 q = blk_init_queue(skd_request_fn, &skdev->lock);
4831 } else {
4832 q = blk_alloc_queue(GFP_KERNEL);
4833 q->queue_flags = QUEUE_FLAG_IO_STAT | QUEUE_FLAG_STACKABLE;
4834 }
4835
4836 if (!q) {
4837 rc = -ENOMEM;
4838 goto err_out;
4839 }
4840
4841 skdev->queue = q;
4842 disk->queue = q;
4843 q->queuedata = skdev;
4844
4845 if (skd_bio) {
4846 q->queue_lock = &skdev->lock;
4847 blk_queue_make_request(q, skd_make_request);
4848 }
4849
4850 blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
4851 blk_queue_max_segments(q, skdev->sgs_per_request);
4852 blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
4853
4854 /* set sysfs ptimal_io_size to 8K */
4855 blk_queue_io_opt(q, 8192);
4856
4857 /* DISCARD Flag initialization. */
4858 q->limits.discard_granularity = 8192;
4859 q->limits.discard_alignment = 0;
4860 q->limits.max_discard_sectors = UINT_MAX >> 9;
4861 q->limits.discard_zeroes_data = 1;
4862 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
4863 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
4864
4865 spin_lock_irqsave(&skdev->lock, flags);
4866 VPRINTK(skdev, "stopping %s queue\n", skdev->name);
4867 skd_stop_queue(skdev);
4868 spin_unlock_irqrestore(&skdev->lock, flags);
4869
4870err_out:
4871 return rc;
4872}
4873
4874/*
4875 *****************************************************************************
4876 * DESTRUCT (FREE)
4877 *****************************************************************************
4878 */
4879
4880static void skd_free_skcomp(struct skd_device *skdev);
4881static void skd_free_skmsg(struct skd_device *skdev);
4882static void skd_free_skreq(struct skd_device *skdev);
4883static void skd_free_skspcl(struct skd_device *skdev);
4884static void skd_free_sksb(struct skd_device *skdev);
4885static void skd_free_sg_list(struct skd_device *skdev,
4886 struct fit_sg_descriptor *sg_list,
4887 u32 n_sg, dma_addr_t dma_addr);
4888static void skd_free_disk(struct skd_device *skdev);
4889
4890static void skd_destruct(struct skd_device *skdev)
4891{
4892 if (skdev == NULL)
4893 return;
4894
4895
4896 VPRINTK(skdev, "disk\n");
4897 skd_free_disk(skdev);
4898
4899 VPRINTK(skdev, "sksb\n");
4900 skd_free_sksb(skdev);
4901
4902 VPRINTK(skdev, "skspcl\n");
4903 skd_free_skspcl(skdev);
4904
4905 VPRINTK(skdev, "skreq\n");
4906 skd_free_skreq(skdev);
4907
4908 VPRINTK(skdev, "skmsg\n");
4909 skd_free_skmsg(skdev);
4910
4911 VPRINTK(skdev, "skcomp\n");
4912 skd_free_skcomp(skdev);
4913
4914 VPRINTK(skdev, "skdev\n");
4915 kfree(skdev);
4916}
4917
4918static void skd_free_skcomp(struct skd_device *skdev)
4919{
4920 if (skdev->skcomp_table != NULL) {
4921 u32 nbytes;
4922
4923 nbytes = sizeof(skdev->skcomp_table[0]) *
4924 SKD_N_COMPLETION_ENTRY;
4925 pci_free_consistent(skdev->pdev, nbytes,
4926 skdev->skcomp_table, skdev->cq_dma_address);
4927 }
4928
4929 skdev->skcomp_table = NULL;
4930 skdev->cq_dma_address = 0;
4931}
4932
4933static void skd_free_skmsg(struct skd_device *skdev)
4934{
4935 u32 i;
4936
4937 if (skdev->skmsg_table == NULL)
4938 return;
4939
4940 for (i = 0; i < skdev->num_fitmsg_context; i++) {
4941 struct skd_fitmsg_context *skmsg;
4942
4943 skmsg = &skdev->skmsg_table[i];
4944
4945 if (skmsg->msg_buf != NULL) {
4946 skmsg->msg_buf += skmsg->offset;
4947 skmsg->mb_dma_address += skmsg->offset;
4948 pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES,
4949 skmsg->msg_buf,
4950 skmsg->mb_dma_address);
4951 }
4952 skmsg->msg_buf = NULL;
4953 skmsg->mb_dma_address = 0;
4954 }
4955
4956 kfree(skdev->skmsg_table);
4957 skdev->skmsg_table = NULL;
4958}
4959
4960static void skd_free_skreq(struct skd_device *skdev)
4961{
4962 u32 i;
4963
4964 if (skdev->skreq_table == NULL)
4965 return;
4966
4967 for (i = 0; i < skdev->num_req_context; i++) {
4968 struct skd_request_context *skreq;
4969
4970 skreq = &skdev->skreq_table[i];
4971
4972 skd_free_sg_list(skdev, skreq->sksg_list,
4973 skdev->sgs_per_request,
4974 skreq->sksg_dma_address);
4975
4976 skreq->sksg_list = NULL;
4977 skreq->sksg_dma_address = 0;
4978
4979 kfree(skreq->sg);
4980 }
4981
4982 kfree(skdev->skreq_table);
4983 skdev->skreq_table = NULL;
4984}
4985
4986static void skd_free_skspcl(struct skd_device *skdev)
4987{
4988 u32 i;
4989 u32 nbytes;
4990
4991 if (skdev->skspcl_table == NULL)
4992 return;
4993
4994 for (i = 0; i < skdev->n_special; i++) {
4995 struct skd_special_context *skspcl;
4996
4997 skspcl = &skdev->skspcl_table[i];
4998
4999 if (skspcl->msg_buf != NULL) {
5000 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
5001 pci_free_consistent(skdev->pdev, nbytes,
5002 skspcl->msg_buf,
5003 skspcl->mb_dma_address);
5004 }
5005
5006 skspcl->msg_buf = NULL;
5007 skspcl->mb_dma_address = 0;
5008
5009 skd_free_sg_list(skdev, skspcl->req.sksg_list,
5010 SKD_N_SG_PER_SPECIAL,
5011 skspcl->req.sksg_dma_address);
5012
5013 skspcl->req.sksg_list = NULL;
5014 skspcl->req.sksg_dma_address = 0;
5015
5016 kfree(skspcl->req.sg);
5017 }
5018
5019 kfree(skdev->skspcl_table);
5020 skdev->skspcl_table = NULL;
5021}
5022
5023static void skd_free_sksb(struct skd_device *skdev)
5024{
5025 struct skd_special_context *skspcl;
5026 u32 nbytes;
5027
5028 skspcl = &skdev->internal_skspcl;
5029
5030 if (skspcl->data_buf != NULL) {
5031 nbytes = SKD_N_INTERNAL_BYTES;
5032
5033 pci_free_consistent(skdev->pdev, nbytes,
5034 skspcl->data_buf, skspcl->db_dma_address);
5035 }
5036
5037 skspcl->data_buf = NULL;
5038 skspcl->db_dma_address = 0;
5039
5040 if (skspcl->msg_buf != NULL) {
5041 nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
5042 pci_free_consistent(skdev->pdev, nbytes,
5043 skspcl->msg_buf, skspcl->mb_dma_address);
5044 }
5045
5046 skspcl->msg_buf = NULL;
5047 skspcl->mb_dma_address = 0;
5048
5049 skd_free_sg_list(skdev, skspcl->req.sksg_list, 1,
5050 skspcl->req.sksg_dma_address);
5051
5052 skspcl->req.sksg_list = NULL;
5053 skspcl->req.sksg_dma_address = 0;
5054}
5055
5056static void skd_free_sg_list(struct skd_device *skdev,
5057 struct fit_sg_descriptor *sg_list,
5058 u32 n_sg, dma_addr_t dma_addr)
5059{
5060 if (sg_list != NULL) {
5061 u32 nbytes;
5062
5063 nbytes = sizeof(*sg_list) * n_sg;
5064
5065 pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr);
5066 }
5067}
5068
5069static void skd_free_disk(struct skd_device *skdev)
5070{
5071 struct gendisk *disk = skdev->disk;
5072
5073 if (disk != NULL) {
5074 struct request_queue *q = disk->queue;
5075
5076 if (disk->flags & GENHD_FL_UP)
5077 del_gendisk(disk);
5078 if (q)
5079 blk_cleanup_queue(q);
5080 put_disk(disk);
5081 }
5082 skdev->disk = NULL;
5083}
5084
5085
5086
5087/*
5088 *****************************************************************************
5089 * BLOCK DEVICE (BDEV) GLUE
5090 *****************************************************************************
5091 */
5092
5093static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5094{
5095 struct skd_device *skdev;
5096 u64 capacity;
5097
5098 skdev = bdev->bd_disk->private_data;
5099
5100 DPRINTK(skdev, "%s: CMD[%s] getgeo device\n",
5101 bdev->bd_disk->disk_name, current->comm);
5102
5103 if (skdev->read_cap_is_valid) {
5104 capacity = get_capacity(skdev->disk);
5105 geo->heads = 64;
5106 geo->sectors = 255;
5107 geo->cylinders = (capacity) / (255 * 64);
5108
5109 return 0;
5110 }
5111 return -EIO;
5112}
5113
5114static int skd_bdev_attach(struct skd_device *skdev)
5115{
5116 DPRINTK(skdev, "add_disk\n");
5117 add_disk(skdev->disk);
5118 return 0;
5119}
5120
5121static const struct block_device_operations skd_blockdev_ops = {
5122 .owner = THIS_MODULE,
5123 .ioctl = skd_bdev_ioctl,
5124 .getgeo = skd_bdev_getgeo,
5125};
5126
5127
5128/*
5129 *****************************************************************************
5130 * PCIe DRIVER GLUE
5131 *****************************************************************************
5132 */
5133
5134static DEFINE_PCI_DEVICE_TABLE(skd_pci_tbl) = {
5135 { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
5136 PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
5137 { 0 } /* terminate list */
5138};
5139
5140MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
5141
5142static char *skd_pci_info(struct skd_device *skdev, char *str)
5143{
5144 int pcie_reg;
5145
5146 strcpy(str, "PCIe (");
5147 pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
5148
5149 if (pcie_reg) {
5150
5151 char lwstr[6];
5152 uint16_t pcie_lstat, lspeed, lwidth;
5153
5154 pcie_reg += 0x12;
5155 pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
5156 lspeed = pcie_lstat & (0xF);
5157 lwidth = (pcie_lstat & 0x3F0) >> 4;
5158
5159 if (lspeed == 1)
5160 strcat(str, "2.5GT/s ");
5161 else if (lspeed == 2)
5162 strcat(str, "5.0GT/s ");
5163 else
5164 strcat(str, "<unknown> ");
5165 snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
5166 strcat(str, lwstr);
5167 }
5168 return str;
5169}
5170
5171static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
5172{
5173 int i;
5174 int rc = 0;
5175 char pci_str[32];
5176 struct skd_device *skdev;
5177
5178 pr_info("STEC s1120 Driver(%s) version %s-b%s\n",
5179 DRV_NAME, DRV_VERSION, DRV_BUILD_ID);
5180 pr_info("(skd?:??:[%s]): vendor=%04X device=%04x\n",
5181 pci_name(pdev), pdev->vendor, pdev->device);
5182
5183 rc = pci_enable_device(pdev);
5184 if (rc)
5185 return rc;
5186 rc = pci_request_regions(pdev, DRV_NAME);
5187 if (rc)
5188 goto err_out;
5189 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
5190 if (!rc) {
5191 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
5192
5193 pr_err("(%s): consistent DMA mask error %d\n",
5194 pci_name(pdev), rc);
5195 }
5196 } else {
5197 (rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)));
5198 if (rc) {
5199
5200 pr_err("(%s): DMA mask error %d\n",
5201 pci_name(pdev), rc);
5202 goto err_out_regions;
5203 }
5204 }
5205
5206 skdev = skd_construct(pdev);
5207 if (skdev == NULL)
5208 goto err_out_regions;
5209
5210 skd_pci_info(skdev, pci_str);
5211 pr_info("(%s): %s 64bit\n", skd_name(skdev), pci_str);
5212
5213 pci_set_master(pdev);
5214 rc = pci_enable_pcie_error_reporting(pdev);
5215 if (rc) {
5216 pr_err(
5217 "(%s): bad enable of PCIe error reporting rc=%d\n",
5218 skd_name(skdev), rc);
5219 skdev->pcie_error_reporting_is_enabled = 0;
5220 } else
5221 skdev->pcie_error_reporting_is_enabled = 1;
5222
5223
5224 pci_set_drvdata(pdev, skdev);
5225 skdev->pdev = pdev;
5226 skdev->disk->driverfs_dev = &pdev->dev;
5227
5228 for (i = 0; i < SKD_MAX_BARS; i++) {
5229 skdev->mem_phys[i] = pci_resource_start(pdev, i);
5230 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
5231 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
5232 skdev->mem_size[i]);
5233 if (!skdev->mem_map[i]) {
5234 pr_err("(%s): Unable to map adapter memory!\n",
5235 skd_name(skdev));
5236 rc = -ENODEV;
5237 goto err_out_iounmap;
5238 }
5239 DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
5240 skdev->mem_map[i],
5241 (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
5242 }
5243
5244 rc = skd_acquire_irq(skdev);
5245 if (rc) {
5246 pr_err("(%s): interrupt resource error %d\n",
5247 skd_name(skdev), rc);
5248 goto err_out_iounmap;
5249 }
5250
5251 rc = skd_start_timer(skdev);
5252 if (rc)
5253 goto err_out_timer;
5254
5255 init_waitqueue_head(&skdev->waitq);
5256
5257 skd_start_device(skdev);
5258
5259 rc = wait_event_interruptible_timeout(skdev->waitq,
5260 (skdev->gendisk_on),
5261 (SKD_START_WAIT_SECONDS * HZ));
5262 if (skdev->gendisk_on > 0) {
5263 /* device came on-line after reset */
5264 skd_bdev_attach(skdev);
5265 rc = 0;
5266 } else {
5267 /* we timed out, something is wrong with the device,
5268 don't add the disk structure */
5269 pr_err(
5270 "(%s): error: waiting for s1120 timed out %d!\n",
5271 skd_name(skdev), rc);
5272 /* in case of no error; we timeout with ENXIO */
5273 if (!rc)
5274 rc = -ENXIO;
5275 goto err_out_timer;
5276 }
5277
5278
5279#ifdef SKD_VMK_POLL_HANDLER
5280 if (skdev->irq_type == SKD_IRQ_MSIX) {
5281 /* MSIX completion handler is being used for coredump */
5282 vmklnx_scsi_register_poll_handler(skdev->scsi_host,
5283 skdev->msix_entries[5].vector,
5284 skd_comp_q, skdev);
5285 } else {
5286 vmklnx_scsi_register_poll_handler(skdev->scsi_host,
5287 skdev->pdev->irq, skd_isr,
5288 skdev);
5289 }
5290#endif /* SKD_VMK_POLL_HANDLER */
5291
5292 return rc;
5293
5294err_out_timer:
5295 skd_stop_device(skdev);
5296 skd_release_irq(skdev);
5297
5298err_out_iounmap:
5299 for (i = 0; i < SKD_MAX_BARS; i++)
5300 if (skdev->mem_map[i])
5301 iounmap(skdev->mem_map[i]);
5302
5303 if (skdev->pcie_error_reporting_is_enabled)
5304 pci_disable_pcie_error_reporting(pdev);
5305
5306 skd_destruct(skdev);
5307
5308err_out_regions:
5309 pci_release_regions(pdev);
5310
5311err_out:
5312 pci_disable_device(pdev);
5313 pci_set_drvdata(pdev, NULL);
5314 return rc;
5315}
5316
5317static void skd_pci_remove(struct pci_dev *pdev)
5318{
5319 int i;
5320 struct skd_device *skdev;
5321
5322 skdev = pci_get_drvdata(pdev);
5323 if (!skdev) {
5324 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5325 return;
5326 }
5327 skd_stop_device(skdev);
5328 skd_release_irq(skdev);
5329
5330 for (i = 0; i < SKD_MAX_BARS; i++)
5331 if (skdev->mem_map[i])
5332 iounmap((u32 *)skdev->mem_map[i]);
5333
5334 if (skdev->pcie_error_reporting_is_enabled)
5335 pci_disable_pcie_error_reporting(pdev);
5336
5337 skd_destruct(skdev);
5338
5339 pci_release_regions(pdev);
5340 pci_disable_device(pdev);
5341 pci_set_drvdata(pdev, NULL);
5342
5343 return;
5344}
5345
5346static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
5347{
5348 int i;
5349 struct skd_device *skdev;
5350
5351 skdev = pci_get_drvdata(pdev);
5352 if (!skdev) {
5353 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5354 return -EIO;
5355 }
5356
5357 skd_stop_device(skdev);
5358
5359 skd_release_irq(skdev);
5360
5361 for (i = 0; i < SKD_MAX_BARS; i++)
5362 if (skdev->mem_map[i])
5363 iounmap((u32 *)skdev->mem_map[i]);
5364
5365 if (skdev->pcie_error_reporting_is_enabled)
5366 pci_disable_pcie_error_reporting(pdev);
5367
5368 pci_release_regions(pdev);
5369 pci_save_state(pdev);
5370 pci_disable_device(pdev);
5371 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5372 return 0;
5373}
5374
5375static int skd_pci_resume(struct pci_dev *pdev)
5376{
5377 int i;
5378 int rc = 0;
5379 struct skd_device *skdev;
5380
5381 skdev = pci_get_drvdata(pdev);
5382 if (!skdev) {
5383 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5384 return -1;
5385 }
5386
5387 pci_set_power_state(pdev, PCI_D0);
5388 pci_enable_wake(pdev, PCI_D0, 0);
5389 pci_restore_state(pdev);
5390
5391 rc = pci_enable_device(pdev);
5392 if (rc)
5393 return rc;
5394 rc = pci_request_regions(pdev, DRV_NAME);
5395 if (rc)
5396 goto err_out;
5397 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
5398 if (!rc) {
5399 if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
5400
5401 pr_err("(%s): consistent DMA mask error %d\n",
5402 pci_name(pdev), rc);
5403 }
5404 } else {
5405 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5406 if (rc) {
5407
5408 pr_err("(%s): DMA mask error %d\n",
5409 pci_name(pdev), rc);
5410 goto err_out_regions;
5411 }
5412 }
5413
5414 pci_set_master(pdev);
5415 rc = pci_enable_pcie_error_reporting(pdev);
5416 if (rc) {
5417 pr_err("(%s): bad enable of PCIe error reporting rc=%d\n",
5418 skdev->name, rc);
5419 skdev->pcie_error_reporting_is_enabled = 0;
5420 } else
5421 skdev->pcie_error_reporting_is_enabled = 1;
5422
5423 for (i = 0; i < SKD_MAX_BARS; i++) {
5424
5425 skdev->mem_phys[i] = pci_resource_start(pdev, i);
5426 skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
5427 skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
5428 skdev->mem_size[i]);
5429 if (!skdev->mem_map[i]) {
5430 pr_err("(%s): Unable to map adapter memory!\n",
5431 skd_name(skdev));
5432 rc = -ENODEV;
5433 goto err_out_iounmap;
5434 }
5435 DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
5436 skdev->mem_map[i],
5437 (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
5438 }
5439 rc = skd_acquire_irq(skdev);
5440 if (rc) {
5441
5442 pr_err("(%s): interrupt resource error %d\n",
5443 pci_name(pdev), rc);
5444 goto err_out_iounmap;
5445 }
5446
5447 rc = skd_start_timer(skdev);
5448 if (rc)
5449 goto err_out_timer;
5450
5451 init_waitqueue_head(&skdev->waitq);
5452
5453 skd_start_device(skdev);
5454
5455 return rc;
5456
5457err_out_timer:
5458 skd_stop_device(skdev);
5459 skd_release_irq(skdev);
5460
5461err_out_iounmap:
5462 for (i = 0; i < SKD_MAX_BARS; i++)
5463 if (skdev->mem_map[i])
5464 iounmap(skdev->mem_map[i]);
5465
5466 if (skdev->pcie_error_reporting_is_enabled)
5467 pci_disable_pcie_error_reporting(pdev);
5468
5469err_out_regions:
5470 pci_release_regions(pdev);
5471
5472err_out:
5473 pci_disable_device(pdev);
5474 return rc;
5475}
5476
5477static void skd_pci_shutdown(struct pci_dev *pdev)
5478{
5479 struct skd_device *skdev;
5480
5481 pr_err("skd_pci_shutdown called\n");
5482
5483 skdev = pci_get_drvdata(pdev);
5484 if (!skdev) {
5485 pr_err("%s: no device data for PCI\n", pci_name(pdev));
5486 return;
5487 }
5488
5489 pr_err("%s: calling stop\n", skd_name(skdev));
5490 skd_stop_device(skdev);
5491}
5492
5493static struct pci_driver skd_driver = {
5494 .name = DRV_NAME,
5495 .id_table = skd_pci_tbl,
5496 .probe = skd_pci_probe,
5497 .remove = skd_pci_remove,
5498 .suspend = skd_pci_suspend,
5499 .resume = skd_pci_resume,
5500 .shutdown = skd_pci_shutdown,
5501};
5502
5503/*
5504 *****************************************************************************
5505 * LOGGING SUPPORT
5506 *****************************************************************************
5507 */
5508
5509static const char *skd_name(struct skd_device *skdev)
5510{
5511 memset(skdev->id_str, 0, sizeof(skdev->id_str));
5512
5513 if (skdev->inquiry_is_valid)
5514 snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:%s:[%s]",
5515 skdev->name, skdev->inq_serial_num,
5516 pci_name(skdev->pdev));
5517 else
5518 snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:??:[%s]",
5519 skdev->name, pci_name(skdev->pdev));
5520
5521 return skdev->id_str;
5522}
5523
5524const char *skd_drive_state_to_str(int state)
5525{
5526 switch (state) {
5527 case FIT_SR_DRIVE_OFFLINE:
5528 return "OFFLINE";
5529 case FIT_SR_DRIVE_INIT:
5530 return "INIT";
5531 case FIT_SR_DRIVE_ONLINE:
5532 return "ONLINE";
5533 case FIT_SR_DRIVE_BUSY:
5534 return "BUSY";
5535 case FIT_SR_DRIVE_FAULT:
5536 return "FAULT";
5537 case FIT_SR_DRIVE_DEGRADED:
5538 return "DEGRADED";
5539 case FIT_SR_PCIE_LINK_DOWN:
5540 return "INK_DOWN";
5541 case FIT_SR_DRIVE_SOFT_RESET:
5542 return "SOFT_RESET";
5543 case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
5544 return "NEED_FW";
5545 case FIT_SR_DRIVE_INIT_FAULT:
5546 return "INIT_FAULT";
5547 case FIT_SR_DRIVE_BUSY_SANITIZE:
5548 return "BUSY_SANITIZE";
5549 case FIT_SR_DRIVE_BUSY_ERASE:
5550 return "BUSY_ERASE";
5551 case FIT_SR_DRIVE_FW_BOOTING:
5552 return "FW_BOOTING";
5553 default:
5554 return "???";
5555 }
5556}
5557
5558const char *skd_skdev_state_to_str(enum skd_drvr_state state)
5559{
5560 switch (state) {
5561 case SKD_DRVR_STATE_LOAD:
5562 return "LOAD";
5563 case SKD_DRVR_STATE_IDLE:
5564 return "IDLE";
5565 case SKD_DRVR_STATE_BUSY:
5566 return "BUSY";
5567 case SKD_DRVR_STATE_STARTING:
5568 return "STARTING";
5569 case SKD_DRVR_STATE_ONLINE:
5570 return "ONLINE";
5571 case SKD_DRVR_STATE_PAUSING:
5572 return "PAUSING";
5573 case SKD_DRVR_STATE_PAUSED:
5574 return "PAUSED";
5575 case SKD_DRVR_STATE_DRAINING_TIMEOUT:
5576 return "DRAINING_TIMEOUT";
5577 case SKD_DRVR_STATE_RESTARTING:
5578 return "RESTARTING";
5579 case SKD_DRVR_STATE_RESUMING:
5580 return "RESUMING";
5581 case SKD_DRVR_STATE_STOPPING:
5582 return "STOPPING";
5583 case SKD_DRVR_STATE_SYNCING:
5584 return "SYNCING";
5585 case SKD_DRVR_STATE_FAULT:
5586 return "FAULT";
5587 case SKD_DRVR_STATE_DISAPPEARED:
5588 return "DISAPPEARED";
5589 case SKD_DRVR_STATE_BUSY_ERASE:
5590 return "BUSY_ERASE";
5591 case SKD_DRVR_STATE_BUSY_SANITIZE:
5592 return "BUSY_SANITIZE";
5593 case SKD_DRVR_STATE_BUSY_IMMINENT:
5594 return "BUSY_IMMINENT";
5595 case SKD_DRVR_STATE_WAIT_BOOT:
5596 return "WAIT_BOOT";
5597
5598 default:
5599 return "???";
5600 }
5601}
5602
5603const char *skd_skmsg_state_to_str(enum skd_fit_msg_state state)
5604{
5605 switch (state) {
5606 case SKD_MSG_STATE_IDLE:
5607 return "IDLE";
5608 case SKD_MSG_STATE_BUSY:
5609 return "BUSY";
5610 default:
5611 return "???";
5612 }
5613}
5614
5615const char *skd_skreq_state_to_str(enum skd_req_state state)
5616{
5617 switch (state) {
5618 case SKD_REQ_STATE_IDLE:
5619 return "IDLE";
5620 case SKD_REQ_STATE_SETUP:
5621 return "SETUP";
5622 case SKD_REQ_STATE_BUSY:
5623 return "BUSY";
5624 case SKD_REQ_STATE_COMPLETED:
5625 return "COMPLETED";
5626 case SKD_REQ_STATE_TIMEOUT:
5627 return "TIMEOUT";
5628 case SKD_REQ_STATE_ABORTED:
5629 return "ABORTED";
5630 default:
5631 return "???";
5632 }
5633}
5634
5635static void skd_log_skdev(struct skd_device *skdev, const char *event)
5636{
5637 DPRINTK(skdev, "(%s) skdev=%p event='%s'\n", skdev->name, skdev, event);
5638 DPRINTK(skdev, " drive_state=%s(%d) driver_state=%s(%d)\n",
5639 skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
5640 skd_skdev_state_to_str(skdev->state), skdev->state);
5641 DPRINTK(skdev, " busy=%d limit=%d dev=%d lowat=%d\n",
5642 skdev->in_flight, skdev->cur_max_queue_depth,
5643 skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
5644 DPRINTK(skdev, " timestamp=0x%x cycle=%d cycle_ix=%d\n",
5645 skdev->timeout_stamp, skdev->skcomp_cycle, skdev->skcomp_ix);
5646}
5647
5648static void skd_log_skmsg(struct skd_device *skdev,
5649 struct skd_fitmsg_context *skmsg, const char *event)
5650{
5651 DPRINTK(skdev, "(%s) skmsg=%p event='%s'\n", skdev->name, skmsg, event);
5652 DPRINTK(skdev, " state=%s(%d) id=0x%04x length=%d\n",
5653 skd_skmsg_state_to_str(skmsg->state), skmsg->state,
5654 skmsg->id, skmsg->length);
5655}
5656
5657static void skd_log_skreq(struct skd_device *skdev,
5658 struct skd_request_context *skreq, const char *event)
5659{
5660 DPRINTK(skdev, "(%s) skreq=%p event='%s'\n", skdev->name, skreq, event);
5661 DPRINTK(skdev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
5662 skd_skreq_state_to_str(skreq->state), skreq->state,
5663 skreq->id, skreq->fitmsg_id);
5664 DPRINTK(skdev, " timo=0x%x sg_dir=%d n_sg=%d\n",
5665 skreq->timeout_stamp, skreq->sg_data_dir, skreq->n_sg);
5666
5667 if (!skd_bio) {
5668 if (skreq->req != NULL) {
5669 struct request *req = skreq->req;
5670 u32 lba = (u32)blk_rq_pos(req);
5671 u32 count = blk_rq_sectors(req);
5672
5673 DPRINTK(skdev,
5674 " req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
5675 req, lba, lba, count, count,
5676 (int)rq_data_dir(req));
5677 } else
5678 DPRINTK(skdev, " req=NULL\n");
5679 } else {
5680 if (skreq->bio != NULL) {
5681 struct bio *bio = skreq->bio;
5682 u32 lba = (u32)bio->bi_sector;
5683 u32 count = bio_sectors(bio);
5684
5685 DPRINTK(skdev,
5686 " bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
5687 bio, lba, lba, count, count,
5688 (int)bio_data_dir(bio));
5689 } else
5690 DPRINTK(skdev, " req=NULL\n");
5691 }
5692}
5693
5694/*
5695 *****************************************************************************
5696 * MODULE GLUE
5697 *****************************************************************************
5698 */
5699
5700static int __init skd_init(void)
5701{
5702 int rc = 0;
5703
5704 pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);
5705
5706 switch (skd_isr_type) {
5707 case SKD_IRQ_LEGACY:
5708 case SKD_IRQ_MSI:
5709 case SKD_IRQ_MSIX:
5710 break;
5711 default:
5712 pr_info("skd_isr_type %d invalid, re-set to %d\n",
5713 skd_isr_type, SKD_IRQ_DEFAULT);
5714 skd_isr_type = SKD_IRQ_DEFAULT;
5715 }
5716
5717 skd_flush_slab = kmem_cache_create(SKD_FLUSH_JOB,
5718 sizeof(struct skd_flush_cmd),
5719 0, 0, NULL);
5720
5721 if (!skd_flush_slab) {
5722 pr_err("failed to allocated flush slab.\n");
5723 return -ENOMEM;
5724 }
5725
5726 if (skd_max_queue_depth < 1
5727 || skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
5728 pr_info(
5729 "skd_max_queue_depth %d invalid, re-set to %d\n",
5730 skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
5731 skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
5732 }
5733
5734 if (skd_max_req_per_msg < 1 || skd_max_req_per_msg > 14) {
5735 pr_info(
5736 "skd_max_req_per_msg %d invalid, re-set to %d\n",
5737 skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
5738 skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
5739 }
5740
5741 if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
5742 pr_info(
5743 "skd_sg_per_request %d invalid, re-set to %d\n",
5744 skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
5745 skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
5746 }
5747
5748 if (skd_dbg_level < 0 || skd_dbg_level > 2) {
5749 pr_info("skd_dbg_level %d invalid, re-set to %d\n",
5750 skd_dbg_level, 0);
5751 skd_dbg_level = 0;
5752 }
5753
5754 if (skd_isr_comp_limit < 0) {
5755 pr_info("skd_isr_comp_limit %d invalid, set to %d\n",
5756 skd_isr_comp_limit, 0);
5757 skd_isr_comp_limit = 0;
5758 }
5759
5760 if (skd_max_pass_thru < 1 || skd_max_pass_thru > 50) {
5761 pr_info("skd_max_pass_thru %d invalid, re-set to %d\n",
5762 skd_max_pass_thru, SKD_N_SPECIAL_CONTEXT);
5763 skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
5764 }
5765
5766 /* Obtain major device number. */
5767 rc = register_blkdev(0, DRV_NAME);
5768 if (rc < 0)
5769 return rc;
5770
5771 skd_major = rc;
5772
5773 return pci_register_driver(&skd_driver);
5774
5775}
5776
5777static void __exit skd_exit(void)
5778{
5779 pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID);
5780
5781 unregister_blkdev(skd_major, DRV_NAME);
5782 pci_unregister_driver(&skd_driver);
5783
5784 kmem_cache_destroy(skd_flush_slab);
5785}
5786
5787static int
5788skd_flush_cmd_enqueue(struct skd_device *skdev, void *cmd)
5789{
5790 struct skd_flush_cmd *item;
5791
5792 item = kmem_cache_zalloc(skd_flush_slab, GFP_ATOMIC);
5793 if (!item) {
5794 pr_err("skd_flush_cmd_enqueue: Failed to allocated item.\n");
5795 return -ENOMEM;
5796 }
5797
5798 item->cmd = cmd;
5799 list_add_tail(&item->flist, &skdev->flush_list);
5800 return 0;
5801}
5802
5803static void *
5804skd_flush_cmd_dequeue(struct skd_device *skdev)
5805{
5806 void *cmd;
5807 struct skd_flush_cmd *item;
5808
5809 item = list_entry(skdev->flush_list.next, struct skd_flush_cmd, flist);
5810 list_del_init(&item->flist);
5811 cmd = item->cmd;
5812 kmem_cache_free(skd_flush_slab, item);
5813 return cmd;
5814}
5815
5816module_init(skd_init);
5817module_exit(skd_exit);
Linux kernel - Deliverables
This page took 0.229425 seconds and 5 git commands to generate.