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[SCSI] hptiop: fix sense_buffer access bug
[deliverable/linux.git] / drivers / ata / libata-scsi.c
CommitLineData
1da177e4 1/*
af36d7f0
JG		 2 * libata-scsi.c - helper library for ATA
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
33 *
1da177e4
LT		 34 */
35
36#include <linux/kernel.h>
37#include <linux/blkdev.h>
38#include <linux/spinlock.h>
39#include <scsi/scsi.h>
1da177e4 40#include <scsi/scsi_host.h>
beb40487 41#include <scsi/scsi_cmnd.h>
85837ebd 42#include <scsi/scsi_eh.h>
005a5a06 43#include <scsi/scsi_device.h>
a6e6ce8e 44#include <scsi/scsi_tcq.h>
30afc84c 45#include <scsi/scsi_transport.h>
1da177e4 46#include <linux/libata.h>
b095518e 47#include <linux/hdreg.h>
2dcb407e 48#include <linux/uaccess.h>
1da177e4
LT		 49
50#include "libata.h"
51
b095518e
JG		 52#define SECTOR_SIZE 512
53
ad706991 54typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
ab5b3a5b 55
2dcb407e 56static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 57 const struct scsi_device *scsidev);
2dcb407e 58static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
ab5b3a5b 59 const struct scsi_device *scsidev);
83c47bcb
TH		 60static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
61 unsigned int id, unsigned int lun);
ab5b3a5b 62
1da177e4 63
00ac37f5
DG		 64#define RW_RECOVERY_MPAGE 0x1
65#define RW_RECOVERY_MPAGE_LEN 12
66#define CACHE_MPAGE 0x8
67#define CACHE_MPAGE_LEN 20
68#define CONTROL_MPAGE 0xa
69#define CONTROL_MPAGE_LEN 12
70#define ALL_MPAGES 0x3f
71#define ALL_SUB_MPAGES 0xff
72
73
24f75686 74static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
00ac37f5
DG		 75 RW_RECOVERY_MPAGE,
76 RW_RECOVERY_MPAGE_LEN - 2,
24f75686 77 (1 << 7), /* AWRE */
00ac37f5
DG		 78 0, /* read retry count */
79 0, 0, 0, 0,
80 0, /* write retry count */
81 0, 0, 0
82};
83
84static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
85 CACHE_MPAGE,
86 CACHE_MPAGE_LEN - 2,
87 0, /* contains WCE, needs to be 0 for logic */
88 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, /* contains DRA, needs to be 0 for logic */
90 0, 0, 0, 0, 0, 0, 0
91};
92
93static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
94 CONTROL_MPAGE,
95 CONTROL_MPAGE_LEN - 2,
96 2, /* DSENSE=0, GLTSD=1 */
97 0, /* [QAM+QERR may be 1, see 05-359r1] */
98 0, 0, 0, 0, 0xff, 0xff,
99 0, 30 /* extended self test time, see 05-359r1 */
100};
101
30afc84c
TH		 102/*
103 * libata transport template. libata doesn't do real transport stuff.
104 * It just needs the eh_timed_out hook.
105 */
f3187195 106static struct scsi_transport_template ata_scsi_transport_template = {
9227c33d 107 .eh_strategy_handler = ata_scsi_error,
30afc84c 108 .eh_timed_out = ata_scsi_timed_out,
ccf68c34 109 .user_scan = ata_scsi_user_scan,
30afc84c
TH		 110};
111
1da177e4 112
ca77329f
KCA		 113static const struct {
114 enum link_pm value;
115 const char *name;
116} link_pm_policy[] = {
117 { NOT_AVAILABLE, "max_performance" },
118 { MIN_POWER, "min_power" },
119 { MAX_PERFORMANCE, "max_performance" },
120 { MEDIUM_POWER, "medium_power" },
121};
122
a2d6ed14 123static const char *ata_scsi_lpm_get(enum link_pm policy)
ca77329f
KCA		 124{
125 int i;
126
127 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
128 if (link_pm_policy[i].value == policy)
129 return link_pm_policy[i].name;
130
131 return NULL;
132}
133
134static ssize_t ata_scsi_lpm_put(struct class_device *class_dev,
135 const char *buf, size_t count)
136{
137 struct Scsi_Host *shost = class_to_shost(class_dev);
138 struct ata_port *ap = ata_shost_to_port(shost);
139 enum link_pm policy = 0;
140 int i;
141
142 /*
143 * we are skipping array location 0 on purpose - this
144 * is because a value of NOT_AVAILABLE is displayed
145 * to the user as max_performance, but when the user
146 * writes "max_performance", they actually want the
147 * value to match MAX_PERFORMANCE.
148 */
149 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
150 const int len = strlen(link_pm_policy[i].name);
151 if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
152 buf[len] == '\n') {
153 policy = link_pm_policy[i].value;
154 break;
155 }
156 }
157 if (!policy)
158 return -EINVAL;
159
160 ata_lpm_schedule(ap, policy);
161 return count;
162}
163
164static ssize_t
165ata_scsi_lpm_show(struct class_device *class_dev, char *buf)
166{
167 struct Scsi_Host *shost = class_to_shost(class_dev);
168 struct ata_port *ap = ata_shost_to_port(shost);
169 const char *policy =
170 ata_scsi_lpm_get(ap->pm_policy);
171
172 if (!policy)
173 return -EINVAL;
174
175 return snprintf(buf, 23, "%s\n", policy);
176}
177CLASS_DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
178 ata_scsi_lpm_show, ata_scsi_lpm_put);
179EXPORT_SYMBOL_GPL(class_device_attr_link_power_management_policy);
180
ae006510
DG		 181static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
182 void (*done)(struct scsi_cmnd *))
183{
184 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
185 /* "Invalid field in cbd" */
186 done(cmd);
187}
188
1da177e4
LT		 189/**
190 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
191 * @sdev: SCSI device for which BIOS geometry is to be determined
192 * @bdev: block device associated with @sdev
193 * @capacity: capacity of SCSI device
194 * @geom: location to which geometry will be output
195 *
196 * Generic bios head/sector/cylinder calculator
197 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
198 * mapping. Some situations may arise where the disk is not
199 * bootable if this is not used.
200 *
201 * LOCKING:
202 * Defined by the SCSI layer. We don't really care.
203 *
204 * RETURNS:
205 * Zero.
206 */
207int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
208 sector_t capacity, int geom[])
209{
210 geom[0] = 255;
211 geom[1] = 63;
212 sector_div(capacity, 255*63);
213 geom[2] = capacity;
214
215 return 0;
216}
217
5924b74c
TH		 218/**
219 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
220 * @sdev: SCSI device to get identify data for
221 * @arg: User buffer area for identify data
222 *
223 * LOCKING:
224 * Defined by the SCSI layer. We don't really care.
225 *
226 * RETURNS:
227 * Zero on success, negative errno on error.
228 */
229static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
230{
231 struct ata_port *ap = ata_shost_to_port(sdev->host);
232 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
233 u16 __user *dst = arg;
234 char buf[40];
235
236 if (!dev)
237 return -ENOMSG;
238
239 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
240 return -EFAULT;
241
242 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
243 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
244 return -EFAULT;
245
246 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
247 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
248 return -EFAULT;
249
250 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
251 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
252 return -EFAULT;
253
254 return 0;
255}
256
b095518e
JG		 257/**
258 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
8e8b77dd 259 * @scsidev: Device to which we are issuing command
b095518e
JG		 260 * @arg: User provided data for issuing command
261 *
262 * LOCKING:
263 * Defined by the SCSI layer. We don't really care.
264 *
265 * RETURNS:
266 * Zero on success, negative errno on error.
267 */
b095518e
JG		 268int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
269{
270 int rc = 0;
271 u8 scsi_cmd[MAX_COMMAND_SIZE];
bbe1fe7e 272 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
b095518e 273 int argsize = 0;
85837ebd 274 enum dma_data_direction data_dir;
bbe1fe7e 275 int cmd_result;
b095518e 276
c893a3ae 277 if (arg == NULL)
b095518e
JG		 278 return -EINVAL;
279
280 if (copy_from_user(args, arg, sizeof(args)))
281 return -EFAULT;
282
bbe1fe7e
ET		 283 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
284 if (!sensebuf)
285 return -ENOMEM;
286
b095518e
JG		 287 memset(scsi_cmd, 0, sizeof(scsi_cmd));
288
289 if (args[3]) {
290 argsize = SECTOR_SIZE * args[3];
291 argbuf = kmalloc(argsize, GFP_KERNEL);
54dac83c
JR		 292 if (argbuf == NULL) {
293 rc = -ENOMEM;
294 goto error;
295 }
b095518e
JG		 296
297 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
298 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
2dcb407e 299 block count in sector count field */
85837ebd 300 data_dir = DMA_FROM_DEVICE;
b095518e
JG		 301 } else {
302 scsi_cmd[1] = (3 << 1); /* Non-data */
bbe1fe7e 303 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
85837ebd 304 data_dir = DMA_NONE;
b095518e
JG		 305 }
306
307 scsi_cmd[0] = ATA_16;
308
309 scsi_cmd[4] = args[2];
310 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
311 scsi_cmd[6] = args[3];
312 scsi_cmd[8] = args[1];
313 scsi_cmd[10] = 0x4f;
314 scsi_cmd[12] = 0xc2;
315 } else {
316 scsi_cmd[6] = args[1];
317 }
318 scsi_cmd[14] = args[0];
319
320 /* Good values for timeout and retries? Values below
321 from scsi_ioctl_send_command() for default case... */
bbe1fe7e 322 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
2dcb407e 323 sensebuf, (10*HZ), 5, 0);
bbe1fe7e
ET		 324
325 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
326 u8 *desc = sensebuf + 8;
327 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
328
329 /* If we set cc then ATA pass-through will cause a
330 * check condition even if no error. Filter that. */
331 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
332 struct scsi_sense_hdr sshdr;
333 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
2dcb407e
JG		 334 &sshdr);
335 if (sshdr.sense_key == 0 &&
336 sshdr.asc == 0 && sshdr.ascq == 0)
bbe1fe7e
ET		 337 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
338 }
339
340 /* Send userspace a few ATA registers (same as drivers/ide) */
2dcb407e
JG		 341 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
342 desc[0] == 0x09) { /* code is "ATA Descriptor" */
343 args[0] = desc[13]; /* status */
344 args[1] = desc[3]; /* error */
345 args[2] = desc[5]; /* sector count (0:7) */
bbe1fe7e
ET		 346 if (copy_to_user(arg, args, sizeof(args)))
347 rc = -EFAULT;
348 }
349 }
350
351
352 if (cmd_result) {
b095518e
JG		 353 rc = -EIO;
354 goto error;
355 }
356
b095518e 357 if ((argbuf)
c893a3ae 358 && copy_to_user(arg + sizeof(args), argbuf, argsize))
b095518e
JG		 359 rc = -EFAULT;
360error:
bbe1fe7e 361 kfree(sensebuf);
8f760780 362 kfree(argbuf);
b095518e
JG		 363 return rc;
364}
365
366/**
367 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
8e8b77dd 368 * @scsidev: Device to which we are issuing command
b095518e
JG		 369 * @arg: User provided data for issuing command
370 *
371 * LOCKING:
372 * Defined by the SCSI layer. We don't really care.
373 *
374 * RETURNS:
375 * Zero on success, negative errno on error.
376 */
377int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
378{
379 int rc = 0;
380 u8 scsi_cmd[MAX_COMMAND_SIZE];
af068bd1
DM		 381 u8 args[7], *sensebuf = NULL;
382 int cmd_result;
b095518e 383
c893a3ae 384 if (arg == NULL)
b095518e
JG		 385 return -EINVAL;
386
387 if (copy_from_user(args, arg, sizeof(args)))
388 return -EFAULT;
389
af068bd1
DM		 390 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
391 if (!sensebuf)
392 return -ENOMEM;
393
b095518e
JG		 394 memset(scsi_cmd, 0, sizeof(scsi_cmd));
395 scsi_cmd[0] = ATA_16;
396 scsi_cmd[1] = (3 << 1); /* Non-data */
af068bd1 397 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
b095518e
JG		 398 scsi_cmd[4] = args[1];
399 scsi_cmd[6] = args[2];
400 scsi_cmd[8] = args[3];
401 scsi_cmd[10] = args[4];
402 scsi_cmd[12] = args[5];
277239f2 403 scsi_cmd[13] = args[6] & 0x4f;
b095518e
JG		 404 scsi_cmd[14] = args[0];
405
b095518e 406 /* Good values for timeout and retries? Values below
2e9edbf8 407 from scsi_ioctl_send_command() for default case... */
af068bd1
DM		 408 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
409 sensebuf, (10*HZ), 5, 0);
410
411 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
412 u8 *desc = sensebuf + 8;
413 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
414
415 /* If we set cc then ATA pass-through will cause a
416 * check condition even if no error. Filter that. */
417 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
418 struct scsi_sense_hdr sshdr;
419 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
420 &sshdr);
2dcb407e
JG		 421 if (sshdr.sense_key == 0 &&
422 sshdr.asc == 0 && sshdr.ascq == 0)
af068bd1
DM		 423 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
424 }
425
426 /* Send userspace ATA registers */
427 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
428 desc[0] == 0x09) {/* code is "ATA Descriptor" */
429 args[0] = desc[13]; /* status */
430 args[1] = desc[3]; /* error */
431 args[2] = desc[5]; /* sector count (0:7) */
432 args[3] = desc[7]; /* lbal */
433 args[4] = desc[9]; /* lbam */
434 args[5] = desc[11]; /* lbah */
435 args[6] = desc[12]; /* select */
436 if (copy_to_user(arg, args, sizeof(args)))
437 rc = -EFAULT;
438 }
439 }
440
441 if (cmd_result) {
b095518e 442 rc = -EIO;
af068bd1
DM		 443 goto error;
444 }
b095518e 445
af068bd1
DM		 446 error:
447 kfree(sensebuf);
b095518e
JG		 448 return rc;
449}
450
1da177e4
LT		 451int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
452{
1da177e4
LT		 453 int val = -EINVAL, rc = -EINVAL;
454
1da177e4
LT		 455 switch (cmd) {
456 case ATA_IOC_GET_IO32:
457 val = 0;
458 if (copy_to_user(arg, &val, 1))
459 return -EFAULT;
460 return 0;
461
462 case ATA_IOC_SET_IO32:
463 val = (unsigned long) arg;
464 if (val != 0)
465 return -EINVAL;
466 return 0;
467
5924b74c
TH		 468 case HDIO_GET_IDENTITY:
469 return ata_get_identity(scsidev, arg);
470
b095518e
JG		 471 case HDIO_DRIVE_CMD:
472 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
473 return -EACCES;
474 return ata_cmd_ioctl(scsidev, arg);
475
476 case HDIO_DRIVE_TASK:
477 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
478 return -EACCES;
479 return ata_task_ioctl(scsidev, arg);
480
1da177e4
LT		 481 default:
482 rc = -ENOTTY;
483 break;
484 }
485
1da177e4
LT		 486 return rc;
487}
488
489/**
490 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
1da177e4
LT		 491 * @dev: ATA device to which the new command is attached
492 * @cmd: SCSI command that originated this ATA command
493 * @done: SCSI command completion function
494 *
495 * Obtain a reference to an unused ata_queued_cmd structure,
496 * which is the basic libata structure representing a single
497 * ATA command sent to the hardware.
498 *
499 * If a command was available, fill in the SCSI-specific
500 * portions of the structure with information on the
501 * current command.
502 *
503 * LOCKING:
cca3974e 504 * spin_lock_irqsave(host lock)
1da177e4
LT		 505 *
506 * RETURNS:
507 * Command allocated, or %NULL if none available.
508 */
7102d230
AB		 509static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
510 struct scsi_cmnd *cmd,
511 void (*done)(struct scsi_cmnd *))
1da177e4
LT		 512{
513 struct ata_queued_cmd *qc;
514
3373efd8 515 qc = ata_qc_new_init(dev);
1da177e4
LT		 516 if (qc) {
517 qc->scsicmd = cmd;
518 qc->scsidone = done;
519
ff2aeb1e 520 qc->sg = scsi_sglist(cmd);
7120165c 521 qc->n_elem = scsi_sg_count(cmd);
1da177e4
LT		 522 } else {
523 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
524 done(cmd);
525 }
526
527 return qc;
528}
529
b095518e
JG		 530/**
531 * ata_dump_status - user friendly display of error info
532 * @id: id of the port in question
533 * @tf: ptr to filled out taskfile
534 *
535 * Decode and dump the ATA error/status registers for the user so
536 * that they have some idea what really happened at the non
537 * make-believe layer.
538 *
539 * LOCKING:
540 * inherited from caller
541 */
7102d230 542static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
b095518e
JG		 543{
544 u8 stat = tf->command, err = tf->feature;
545
546 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
547 if (stat & ATA_BUSY) {
548 printk("Busy }\n"); /* Data is not valid in this case */
549 } else {
550 if (stat & 0x40) printk("DriveReady ");
551 if (stat & 0x20) printk("DeviceFault ");
552 if (stat & 0x10) printk("SeekComplete ");
553 if (stat & 0x08) printk("DataRequest ");
554 if (stat & 0x04) printk("CorrectedError ");
555 if (stat & 0x02) printk("Index ");
556 if (stat & 0x01) printk("Error ");
557 printk("}\n");
558
559 if (err) {
560 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
561 if (err & 0x04) printk("DriveStatusError ");
562 if (err & 0x80) {
563 if (err & 0x04) printk("BadCRC ");
564 else printk("Sector ");
565 }
566 if (err & 0x40) printk("UncorrectableError ");
567 if (err & 0x10) printk("SectorIdNotFound ");
568 if (err & 0x02) printk("TrackZeroNotFound ");
569 if (err & 0x01) printk("AddrMarkNotFound ");
570 printk("}\n");
571 }
572 }
573}
574
1da177e4
LT		 575/**
576 * ata_to_sense_error - convert ATA error to SCSI error
8e8b77dd 577 * @id: ATA device number
1da177e4 578 * @drv_stat: value contained in ATA status register
b095518e
JG		 579 * @drv_err: value contained in ATA error register
580 * @sk: the sense key we'll fill out
581 * @asc: the additional sense code we'll fill out
582 * @ascq: the additional sense code qualifier we'll fill out
246619da 583 * @verbose: be verbose
1da177e4 584 *
b095518e
JG		 585 * Converts an ATA error into a SCSI error. Fill out pointers to
586 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
587 * format sense blocks.
1da177e4
LT		 588 *
589 * LOCKING:
cca3974e 590 * spin_lock_irqsave(host lock)
1da177e4 591 */
7102d230
AB		 592static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
593 u8 *asc, u8 *ascq, int verbose)
1da177e4 594{
b095518e 595 int i;
ffe75ef6 596
1da177e4 597 /* Based on the 3ware driver translation table */
98ac62de 598 static const unsigned char sense_table[][4] = {
1da177e4
LT		 599 /* BBD|ECC|ID|MAR */
600 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
601 /* BBD|ECC|ID */
602 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
603 /* ECC|MC|MARK */
604 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
605 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
606 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
607 /* MC|ID|ABRT|TRK0|MARK */
608 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
609 /* MCR|MARK */
610 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
611 /* Bad address mark */
612 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
613 /* TRK0 */
614 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
615 /* Abort & !ICRC */
616 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
617 /* Media change request */
618 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
619 /* SRV */
620 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
621 /* Media change */
622 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
623 /* ECC */
624 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
625 /* BBD - block marked bad */
626 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
627 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
628 };
98ac62de 629 static const unsigned char stat_table[][4] = {
1da177e4
LT		 630 /* Must be first because BUSY means no other bits valid */
631 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
632 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
633 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
634 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
635 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
636 };
1da177e4 637
1da177e4
LT		 638 /*
639 * Is this an error we can process/parse
640 */
b095518e
JG		 641 if (drv_stat & ATA_BUSY) {
642 drv_err = 0; /* Ignore the err bits, they're invalid */
1da177e4 643 }
b095518e
JG		 644
645 if (drv_err) {
646 /* Look for drv_err */
647 for (i = 0; sense_table[i][0] != 0xFF; i++) {
648 /* Look for best matches first */
2e9edbf8 649 if ((sense_table[i][0] & drv_err) ==
b095518e
JG		 650 sense_table[i][0]) {
651 *sk = sense_table[i][1];
652 *asc = sense_table[i][2];
653 *ascq = sense_table[i][3];
654 goto translate_done;
655 }
656 }
657 /* No immediate match */
246619da
TH		 658 if (verbose)
659 printk(KERN_WARNING "ata%u: no sense translation for "
660 "error 0x%02x\n", id, drv_err);
1da177e4 661 }
b095518e
JG		 662
663 /* Fall back to interpreting status bits */
664 for (i = 0; stat_table[i][0] != 0xFF; i++) {
665 if (stat_table[i][0] & drv_stat) {
666 *sk = stat_table[i][1];
667 *asc = stat_table[i][2];
668 *ascq = stat_table[i][3];
669 goto translate_done;
1da177e4 670 }
b095518e
JG		 671 }
672 /* No error? Undecoded? */
246619da
TH		 673 if (verbose)
674 printk(KERN_WARNING "ata%u: no sense translation for "
675 "status: 0x%02x\n", id, drv_stat);
b095518e 676
2d202024
AC		 677 /* We need a sensible error return here, which is tricky, and one
678 that won't cause people to do things like return a disk wrongly */
679 *sk = ABORTED_COMMAND;
680 *asc = 0x00;
681 *ascq = 0x00;
b095518e
JG		 682
683 translate_done:
246619da
TH		 684 if (verbose)
685 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
686 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
687 id, drv_stat, drv_err, *sk, *asc, *ascq);
b095518e
JG		 688 return;
689}
690
691/*
750426aa 692 * ata_gen_passthru_sense - Generate check condition sense block.
b095518e
JG		 693 * @qc: Command that completed.
694 *
695 * This function is specific to the ATA descriptor format sense
696 * block specified for the ATA pass through commands. Regardless
697 * of whether the command errored or not, return a sense
698 * block. Copy all controller registers into the sense
699 * block. Clear sense key, ASC & ASCQ if there is no error.
700 *
701 * LOCKING:
750426aa 702 * None.
b095518e 703 */
750426aa 704static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518e
JG		 705{
706 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 707 struct ata_taskfile *tf = &qc->result_tf;
b095518e
JG		 708 unsigned char *sb = cmd->sense_buffer;
709 unsigned char *desc = sb + 8;
246619da 710 int verbose = qc->ap->ops->error_handler == NULL;
b095518e
JG		 711
712 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
713
0e5dec47 714 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 715
b095518e
JG		 716 /*
717 * Use ata_to_sense_error() to map status register bits
718 * onto sense key, asc & ascq.
719 */
058e55e1
TH		 720 if (qc->err_mask ||
721 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 722 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
246619da 723 &sb[1], &sb[2], &sb[3], verbose);
b095518e 724 sb[1] &= 0x0f;
1da177e4
LT		 725 }
726
b095518e
JG		 727 /*
728 * Sense data is current and format is descriptor.
729 */
730 sb[0] = 0x72;
1da177e4 731
b095518e
JG		 732 desc[0] = 0x09;
733
f38621b3
TH		 734 /* set length of additional sense data */
735 sb[7] = 14;
736 desc[1] = 12;
b095518e
JG		 737
738 /*
739 * Copy registers into sense buffer.
740 */
741 desc[2] = 0x00;
742 desc[3] = tf->feature; /* == error reg */
743 desc[5] = tf->nsect;
744 desc[7] = tf->lbal;
745 desc[9] = tf->lbam;
746 desc[11] = tf->lbah;
747 desc[12] = tf->device;
748 desc[13] = tf->command; /* == status reg */
749
750 /*
751 * Fill in Extend bit, and the high order bytes
752 * if applicable.
753 */
754 if (tf->flags & ATA_TFLAG_LBA48) {
755 desc[2] |= 0x01;
756 desc[4] = tf->hob_nsect;
757 desc[6] = tf->hob_lbal;
758 desc[8] = tf->hob_lbam;
759 desc[10] = tf->hob_lbah;
1da177e4 760 }
b095518e 761}
1da177e4 762
b095518e 763/**
750426aa 764 * ata_gen_ata_sense - generate a SCSI fixed sense block
b095518e
JG		 765 * @qc: Command that we are erroring out
766 *
d25614ba
TH		 767 * Generate sense block for a failed ATA command @qc. Descriptor
768 * format is used to accomodate LBA48 block address.
b095518e
JG		 769 *
770 * LOCKING:
750426aa 771 * None.
b095518e 772 */
750426aa 773static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
b095518e 774{
d25614ba 775 struct ata_device *dev = qc->dev;
b095518e 776 struct scsi_cmnd *cmd = qc->scsicmd;
e61e0672 777 struct ata_taskfile *tf = &qc->result_tf;
b095518e 778 unsigned char *sb = cmd->sense_buffer;
d25614ba 779 unsigned char *desc = sb + 8;
246619da 780 int verbose = qc->ap->ops->error_handler == NULL;
d25614ba 781 u64 block;
b095518e
JG		 782
783 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
784
0e5dec47 785 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
b095518e 786
d25614ba
TH		 787 /* sense data is current and format is descriptor */
788 sb[0] = 0x72;
789
790 /* Use ata_to_sense_error() to map status register bits
b095518e
JG		 791 * onto sense key, asc & ascq.
792 */
058e55e1
TH		 793 if (qc->err_mask ||
794 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
44877b4e 795 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
d25614ba
TH		 796 &sb[1], &sb[2], &sb[3], verbose);
797 sb[1] &= 0x0f;
1da177e4 798 }
1da177e4 799
d25614ba 800 block = ata_tf_read_block(&qc->result_tf, dev);
a7dac447 801
d25614ba
TH		 802 /* information sense data descriptor */
803 sb[7] = 12;
804 desc[0] = 0x00;
805 desc[1] = 10;
a7dac447 806
d25614ba
TH		 807 desc[2] |= 0x80; /* valid */
808 desc[6] = block >> 40;
809 desc[7] = block >> 32;
810 desc[8] = block >> 24;
811 desc[9] = block >> 16;
812 desc[10] = block >> 8;
813 desc[11] = block;
1da177e4
LT		 814}
815
a6cce2a7
BK		 816static void ata_scsi_sdev_config(struct scsi_device *sdev)
817{
818 sdev->use_10_for_rw = 1;
819 sdev->use_10_for_ms = 1;
31cc23b3
TH		 820
821 /* Schedule policy is determined by ->qc_defer() callback and
822 * it needs to see every deferred qc. Set dev_blocked to 1 to
823 * prevent SCSI midlayer from automatically deferring
824 * requests.
825 */
826 sdev->max_device_blocked = 1;
a6cce2a7
BK		 827}
828
829static void ata_scsi_dev_config(struct scsi_device *sdev,
830 struct ata_device *dev)
831{
914ed354
TH		 832 /* configure max sectors */
833 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
a6cce2a7 834
914ed354 835 /* SATA DMA transfers must be multiples of 4 byte, so
a6cce2a7
BK		 836 * we need to pad ATAPI transfers using an extra sg.
837 * Decrement max hw segments accordingly.
838 */
839 if (dev->class == ATA_DEV_ATAPI) {
165125e1 840 struct request_queue *q = sdev->request_queue;
a6cce2a7 841 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
d0ad3bc9
JB		 842
843 /* set the min alignment */
844 blk_queue_update_dma_alignment(sdev->request_queue,
845 ATA_DMA_PAD_SZ - 1);
846 } else
847 /* ATA devices must be sector aligned */
848 blk_queue_update_dma_alignment(sdev->request_queue,
849 ATA_SECT_SIZE - 1);
a6e6ce8e 850
d8cf5389
TH		 851 if (dev->class == ATA_DEV_ATA)
852 sdev->manage_start_stop = 1;
853
f26792d5
JG		 854 if (dev->flags & ATA_DFLAG_AN)
855 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
856
a6e6ce8e
TH		 857 if (dev->flags & ATA_DFLAG_NCQ) {
858 int depth;
859
860 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
861 depth = min(ATA_MAX_QUEUE - 1, depth);
862 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
863 }
a6cce2a7
BK		 864}
865
1da177e4
LT		 866/**
867 * ata_scsi_slave_config - Set SCSI device attributes
868 * @sdev: SCSI device to examine
869 *
870 * This is called before we actually start reading
871 * and writing to the device, to configure certain
872 * SCSI mid-layer behaviors.
873 *
874 * LOCKING:
875 * Defined by SCSI layer. We don't really care.
876 */
877
878int ata_scsi_slave_config(struct scsi_device *sdev)
879{
31534363
TH		 880 struct ata_port *ap = ata_shost_to_port(sdev->host);
881 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
882
a6cce2a7 883 ata_scsi_sdev_config(sdev);
1da177e4 884
31534363 885 if (dev)
a6cce2a7 886 ata_scsi_dev_config(sdev, dev);
1da177e4 887
465ff318 888 return 0;
1da177e4
LT		 889}
890
83c47bcb
TH		 891/**
892 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
893 * @sdev: SCSI device to be destroyed
894 *
895 * @sdev is about to be destroyed for hot/warm unplugging. If
896 * this unplugging was initiated by libata as indicated by NULL
897 * dev->sdev, this function doesn't have to do anything.
898 * Otherwise, SCSI layer initiated warm-unplug is in progress.
899 * Clear dev->sdev, schedule the device for ATA detach and invoke
900 * EH.
901 *
902 * LOCKING:
903 * Defined by SCSI layer. We don't really care.
904 */
905void ata_scsi_slave_destroy(struct scsi_device *sdev)
906{
907 struct ata_port *ap = ata_shost_to_port(sdev->host);
908 unsigned long flags;
909 struct ata_device *dev;
910
911 if (!ap->ops->error_handler)
912 return;
913
ba6a1308 914 spin_lock_irqsave(ap->lock, flags);
83c47bcb
TH		 915 dev = __ata_scsi_find_dev(ap, sdev);
916 if (dev && dev->sdev) {
917 /* SCSI device already in CANCEL state, no need to offline it */
918 dev->sdev = NULL;
919 dev->flags |= ATA_DFLAG_DETACH;
920 ata_port_schedule_eh(ap);
921 }
ba6a1308 922 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 923}
924
a6e6ce8e
TH		 925/**
926 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
927 * @sdev: SCSI device to configure queue depth for
928 * @queue_depth: new queue depth
929 *
930 * This is libata standard hostt->change_queue_depth callback.
931 * SCSI will call into this callback when user tries to set queue
932 * depth via sysfs.
933 *
934 * LOCKING:
935 * SCSI layer (we don't care)
936 *
937 * RETURNS:
938 * Newly configured queue depth.
939 */
940int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
941{
942 struct ata_port *ap = ata_shost_to_port(sdev->host);
943 struct ata_device *dev;
360f654e 944 unsigned long flags;
a6e6ce8e 945
c3c70c44 946 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
a6e6ce8e
TH		 947 return sdev->queue_depth;
948
949 dev = ata_scsi_find_dev(ap, sdev);
950 if (!dev || !ata_dev_enabled(dev))
951 return sdev->queue_depth;
952
c3c70c44 953 /* NCQ enabled? */
360f654e 954 spin_lock_irqsave(ap->lock, flags);
c3c70c44
TH		 955 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
956 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
360f654e 957 dev->flags |= ATA_DFLAG_NCQ_OFF;
c3c70c44
TH		 958 queue_depth = 1;
959 }
360f654e
TH		 960 spin_unlock_irqrestore(ap->lock, flags);
961
c3c70c44
TH		 962 /* limit and apply queue depth */
963 queue_depth = min(queue_depth, sdev->host->can_queue);
964 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
965 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
966
967 if (sdev->queue_depth == queue_depth)
968 return -EINVAL;
969
970 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
a6e6ce8e
TH		 971 return queue_depth;
972}
973
d9aca22c 974/* XXX: for spindown warning */
da071b42
TH		 975static void ata_delayed_done_timerfn(unsigned long arg)
976{
977 struct scsi_cmnd *scmd = (void *)arg;
978
979 scmd->scsi_done(scmd);
980}
981
d9aca22c 982/* XXX: for spindown warning */
da071b42
TH		 983static void ata_delayed_done(struct scsi_cmnd *scmd)
984{
985 static struct timer_list timer;
986
987 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
988 mod_timer(&timer, jiffies + 5 * HZ);
989}
990
972dcafb
DG		 991/**
992 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
993 * @qc: Storage for translated ATA taskfile
972dcafb
DG		 994 *
995 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
996 * (to start). Perhaps these commands should be preceded by
997 * CHECK POWER MODE to see what power mode the device is already in.
998 * [See SAT revision 5 at www.t10.org]
999 *
1000 * LOCKING:
cca3974e 1001 * spin_lock_irqsave(host lock)
972dcafb
DG		 1002 *
1003 * RETURNS:
1004 * Zero on success, non-zero on error.
1005 */
ad706991 1006static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
972dcafb 1007{
542b1444 1008 struct scsi_cmnd *scmd = qc->scsicmd;
972dcafb 1009 struct ata_taskfile *tf = &qc->tf;
ad706991 1010 const u8 *cdb = scmd->cmnd;
972dcafb 1011
2e5704f6
TH		 1012 if (scmd->cmd_len < 5)
1013 goto invalid_fld;
1014
972dcafb
DG		 1015 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1016 tf->protocol = ATA_PROT_NODATA;
542b1444 1017 if (cdb[1] & 0x1) {
972dcafb
DG		 1018 ; /* ignore IMMED bit, violates sat-r05 */
1019 }
542b1444 1020 if (cdb[4] & 0x2)
ae006510 1021 goto invalid_fld; /* LOEJ bit set not supported */
542b1444 1022 if (((cdb[4] >> 4) & 0xf) != 0)
ae006510 1023 goto invalid_fld; /* power conditions not supported */
e31e8531
TH		 1024
1025 if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) {
1026 /* the device lacks PM support, finish without doing anything */
1027 scmd->result = SAM_STAT_GOOD;
1028 return 1;
1029 }
1030
542b1444 1031 if (cdb[4] & 0x1) {
972dcafb 1032 tf->nsect = 1; /* 1 sector, lba=0 */
9d5b1302
AL		 1033
1034 if (qc->dev->flags & ATA_DFLAG_LBA) {
c44078c0 1035 tf->flags |= ATA_TFLAG_LBA;
9d5b1302
AL		 1036
1037 tf->lbah = 0x0;
1038 tf->lbam = 0x0;
1039 tf->lbal = 0x0;
1040 tf->device |= ATA_LBA;
1041 } else {
1042 /* CHS */
1043 tf->lbal = 0x1; /* sect */
1044 tf->lbam = 0x0; /* cyl low */
1045 tf->lbah = 0x0; /* cyl high */
1046 }
1047
972dcafb 1048 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
920a4b10
TH		 1049 } else {
1050 /* XXX: This is for backward compatibility, will be
1051 * removed. Read Documentation/feature-removal-schedule.txt
1052 * for more info.
1053 */
d9aca22c 1054 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
920a4b10
TH		 1055 (system_state == SYSTEM_HALT ||
1056 system_state == SYSTEM_POWER_OFF)) {
2dcb407e 1057 static unsigned long warned;
920a4b10 1058
da071b42 1059 if (!test_and_set_bit(0, &warned)) {
920a4b10
TH		 1060 ata_dev_printk(qc->dev, KERN_WARNING,
1061 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1062 "UPDATE SHUTDOWN UTILITY\n");
1063 ata_dev_printk(qc->dev, KERN_WARNING,
1064 "For more info, visit "
1065 "http://linux-ata.org/shutdown.html\n");
da071b42
TH		 1066
1067 /* ->scsi_done is not used, use it for
1068 * delayed completion.
1069 */
1070 scmd->scsi_done = qc->scsidone;
1071 qc->scsidone = ata_delayed_done;
920a4b10
TH		 1072 }
1073 scmd->result = SAM_STAT_GOOD;
1074 return 1;
1075 }
1076
78981a7c
RH		 1077 /* Issue ATA STANDBY IMMEDIATE command */
1078 tf->command = ATA_CMD_STANDBYNOW1;
920a4b10 1079 }
78981a7c 1080
972dcafb
DG		 1081 /*
1082 * Standby and Idle condition timers could be implemented but that
1083 * would require libata to implement the Power condition mode page
1084 * and allow the user to change it. Changing mode pages requires
1085 * MODE SELECT to be implemented.
1086 */
1087
1088 return 0;
ae006510
DG		 1089
1090invalid_fld:
542b1444 1091 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1092 /* "Invalid field in cbd" */
1093 return 1;
972dcafb
DG		 1094}
1095
1096
1da177e4
LT		 1097/**
1098 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1099 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1100 *
1101 * Sets up an ATA taskfile to issue FLUSH CACHE or
1102 * FLUSH CACHE EXT.
1103 *
1104 * LOCKING:
cca3974e 1105 * spin_lock_irqsave(host lock)
1da177e4
LT		 1106 *
1107 * RETURNS:
1108 * Zero on success, non-zero on error.
1109 */
ad706991 1110static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1da177e4
LT		 1111{
1112 struct ata_taskfile *tf = &qc->tf;
1113
1114 tf->flags |= ATA_TFLAG_DEVICE;
1115 tf->protocol = ATA_PROT_NODATA;
1116
6fc49adb 1117 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1da177e4
LT		 1118 tf->command = ATA_CMD_FLUSH_EXT;
1119 else
1120 tf->command = ATA_CMD_FLUSH;
1121
b666da35
TH		 1122 /* flush is critical for IO integrity, consider it an IO command */
1123 qc->flags |= ATA_QCFLAG_IO;
1124
1da177e4
LT		 1125 return 0;
1126}
1127
3aef5231
AL		 1128/**
1129 * scsi_6_lba_len - Get LBA and transfer length
542b1444 1130 * @cdb: SCSI command to translate
3aef5231
AL		 1131 *
1132 * Calculate LBA and transfer length for 6-byte commands.
1133 *
1134 * RETURNS:
1135 * @plba: the LBA
1136 * @plen: the transfer length
1137 */
542b1444 1138static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1139{
1140 u64 lba = 0;
6c7b7d2b 1141 u32 len;
3aef5231
AL		 1142
1143 VPRINTK("six-byte command\n");
1144
6c7b7d2b 1145 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
542b1444
TH		 1146 lba |= ((u64)cdb[2]) << 8;
1147 lba |= ((u64)cdb[3]);
3aef5231 1148
6c7b7d2b 1149 len = cdb[4];
3aef5231
AL		 1150
1151 *plba = lba;
1152 *plen = len;
1153}
1154
1155/**
1156 * scsi_10_lba_len - Get LBA and transfer length
542b1444 1157 * @cdb: SCSI command to translate
3aef5231
AL		 1158 *
1159 * Calculate LBA and transfer length for 10-byte commands.
1160 *
1161 * RETURNS:
1162 * @plba: the LBA
1163 * @plen: the transfer length
1164 */
542b1444 1165static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1166{
1167 u64 lba = 0;
1168 u32 len = 0;
1169
1170 VPRINTK("ten-byte command\n");
1171
542b1444
TH		 1172 lba |= ((u64)cdb[2]) << 24;
1173 lba |= ((u64)cdb[3]) << 16;
1174 lba |= ((u64)cdb[4]) << 8;
1175 lba |= ((u64)cdb[5]);
3aef5231 1176
542b1444
TH		 1177 len |= ((u32)cdb[7]) << 8;
1178 len |= ((u32)cdb[8]);
3aef5231
AL		 1179
1180 *plba = lba;
1181 *plen = len;
1182}
1183
1184/**
1185 * scsi_16_lba_len - Get LBA and transfer length
542b1444 1186 * @cdb: SCSI command to translate
3aef5231
AL		 1187 *
1188 * Calculate LBA and transfer length for 16-byte commands.
1189 *
1190 * RETURNS:
1191 * @plba: the LBA
1192 * @plen: the transfer length
1193 */
542b1444 1194static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
3aef5231
AL		 1195{
1196 u64 lba = 0;
1197 u32 len = 0;
1198
1199 VPRINTK("sixteen-byte command\n");
1200
542b1444
TH		 1201 lba |= ((u64)cdb[2]) << 56;
1202 lba |= ((u64)cdb[3]) << 48;
1203 lba |= ((u64)cdb[4]) << 40;
1204 lba |= ((u64)cdb[5]) << 32;
1205 lba |= ((u64)cdb[6]) << 24;
1206 lba |= ((u64)cdb[7]) << 16;
1207 lba |= ((u64)cdb[8]) << 8;
1208 lba |= ((u64)cdb[9]);
3aef5231 1209
542b1444
TH		 1210 len |= ((u32)cdb[10]) << 24;
1211 len |= ((u32)cdb[11]) << 16;
1212 len |= ((u32)cdb[12]) << 8;
1213 len |= ((u32)cdb[13]);
3aef5231
AL		 1214
1215 *plba = lba;
1216 *plen = len;
1217}
1218
1da177e4
LT		 1219/**
1220 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1221 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1222 *
1223 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1224 *
1225 * LOCKING:
cca3974e 1226 * spin_lock_irqsave(host lock)
1da177e4
LT		 1227 *
1228 * RETURNS:
1229 * Zero on success, non-zero on error.
1230 */
ad706991 1231static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1da177e4 1232{
542b1444 1233 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4 1234 struct ata_taskfile *tf = &qc->tf;
8bf62ece 1235 struct ata_device *dev = qc->dev;
1da177e4 1236 u64 dev_sectors = qc->dev->n_sectors;
ad706991 1237 const u8 *cdb = scmd->cmnd;
3aef5231
AL		 1238 u64 block;
1239 u32 n_block;
1da177e4
LT		 1240
1241 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1242 tf->protocol = ATA_PROT_NODATA;
1da177e4 1243
2e5704f6
TH		 1244 if (cdb[0] == VERIFY) {
1245 if (scmd->cmd_len < 10)
1246 goto invalid_fld;
542b1444 1247 scsi_10_lba_len(cdb, &block, &n_block);
2e5704f6
TH		 1248 } else if (cdb[0] == VERIFY_16) {
1249 if (scmd->cmd_len < 16)
1250 goto invalid_fld;
542b1444 1251 scsi_16_lba_len(cdb, &block, &n_block);
2e5704f6 1252 } else
ae006510 1253 goto invalid_fld;
1da177e4 1254
8bf62ece 1255 if (!n_block)
ae006510 1256 goto nothing_to_do;
8bf62ece 1257 if (block >= dev_sectors)
ae006510 1258 goto out_of_range;
8bf62ece 1259 if ((block + n_block) > dev_sectors)
ae006510 1260 goto out_of_range;
1da177e4 1261
07506697
AL		 1262 if (dev->flags & ATA_DFLAG_LBA) {
1263 tf->flags |= ATA_TFLAG_LBA;
1264
c6a33e24
AL		 1265 if (lba_28_ok(block, n_block)) {
1266 /* use LBA28 */
1267 tf->command = ATA_CMD_VERIFY;
1268 tf->device |= (block >> 24) & 0xf;
1269 } else if (lba_48_ok(block, n_block)) {
1270 if (!(dev->flags & ATA_DFLAG_LBA48))
1271 goto out_of_range;
07506697
AL		 1272
1273 /* use LBA48 */
1274 tf->flags |= ATA_TFLAG_LBA48;
8bf62ece 1275 tf->command = ATA_CMD_VERIFY_EXT;
1da177e4 1276
8bf62ece 1277 tf->hob_nsect = (n_block >> 8) & 0xff;
1da177e4 1278
8bf62ece
AL		 1279 tf->hob_lbah = (block >> 40) & 0xff;
1280 tf->hob_lbam = (block >> 32) & 0xff;
1281 tf->hob_lbal = (block >> 24) & 0xff;
c6a33e24
AL		 1282 } else
1283 /* request too large even for LBA48 */
1284 goto out_of_range;
8bf62ece
AL		 1285
1286 tf->nsect = n_block & 0xff;
1da177e4 1287
8bf62ece
AL		 1288 tf->lbah = (block >> 16) & 0xff;
1289 tf->lbam = (block >> 8) & 0xff;
1290 tf->lbal = block & 0xff;
1da177e4 1291
8bf62ece
AL		 1292 tf->device |= ATA_LBA;
1293 } else {
1294 /* CHS */
1295 u32 sect, head, cyl, track;
1296
c6a33e24
AL		 1297 if (!lba_28_ok(block, n_block))
1298 goto out_of_range;
07506697 1299
8bf62ece
AL		 1300 /* Convert LBA to CHS */
1301 track = (u32)block / dev->sectors;
1302 cyl = track / dev->heads;
1303 head = track % dev->heads;
1304 sect = (u32)block % dev->sectors + 1;
1305
c187c4b5
AL		 1306 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1307 (u32)block, track, cyl, head, sect);
2e9edbf8
JG		 1308
1309 /* Check whether the converted CHS can fit.
1310 Cylinder: 0-65535
8bf62ece
AL		 1311 Head: 0-15
1312 Sector: 1-255*/
2e9edbf8 1313 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
ae006510 1314 goto out_of_range;
2e9edbf8 1315
8bf62ece
AL		 1316 tf->command = ATA_CMD_VERIFY;
1317 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1318 tf->lbal = sect;
1319 tf->lbam = cyl;
1320 tf->lbah = cyl >> 8;
1321 tf->device |= head;
1322 }
1da177e4
LT		 1323
1324 return 0;
ae006510
DG		 1325
1326invalid_fld:
542b1444 1327 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1328 /* "Invalid field in cbd" */
1329 return 1;
1330
1331out_of_range:
542b1444 1332 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1333 /* "Logical Block Address out of range" */
1334 return 1;
1335
1336nothing_to_do:
542b1444 1337 scmd->result = SAM_STAT_GOOD;
ae006510 1338 return 1;
1da177e4
LT		 1339}
1340
1341/**
1342 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1343 * @qc: Storage for translated ATA taskfile
1da177e4
LT		 1344 *
1345 * Converts any of six SCSI read/write commands into the
1346 * ATA counterpart, including starting sector (LBA),
1347 * sector count, and taking into account the device's LBA48
1348 * support.
1349 *
1350 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1351 * %WRITE_16 are currently supported.
1352 *
1353 * LOCKING:
cca3974e 1354 * spin_lock_irqsave(host lock)
1da177e4
LT		 1355 *
1356 * RETURNS:
1357 * Zero on success, non-zero on error.
1358 */
ad706991 1359static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1da177e4 1360{
542b1444 1361 struct scsi_cmnd *scmd = qc->scsicmd;
ad706991 1362 const u8 *cdb = scmd->cmnd;
bd056d7e 1363 unsigned int tf_flags = 0;
3aef5231
AL		 1364 u64 block;
1365 u32 n_block;
bd056d7e 1366 int rc;
1da177e4 1367
542b1444 1368 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
bd056d7e 1369 tf_flags |= ATA_TFLAG_WRITE;
1da177e4 1370
9a3dccc4 1371 /* Calculate the SCSI LBA, transfer length and FUA. */
542b1444 1372 switch (cdb[0]) {
3aef5231
AL		 1373 case READ_10:
1374 case WRITE_10:
2e5704f6
TH		 1375 if (unlikely(scmd->cmd_len < 10))
1376 goto invalid_fld;
542b1444
TH		 1377 scsi_10_lba_len(cdb, &block, &n_block);
1378 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1379 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1380 break;
1381 case READ_6:
1382 case WRITE_6:
2e5704f6
TH		 1383 if (unlikely(scmd->cmd_len < 6))
1384 goto invalid_fld;
542b1444 1385 scsi_6_lba_len(cdb, &block, &n_block);
c187c4b5
AL		 1386
1387 /* for 6-byte r/w commands, transfer length 0
1388 * means 256 blocks of data, not 0 block.
1389 */
76b2bf9b
JG		 1390 if (!n_block)
1391 n_block = 256;
3aef5231
AL		 1392 break;
1393 case READ_16:
1394 case WRITE_16:
2e5704f6
TH		 1395 if (unlikely(scmd->cmd_len < 16))
1396 goto invalid_fld;
542b1444
TH		 1397 scsi_16_lba_len(cdb, &block, &n_block);
1398 if (unlikely(cdb[1] & (1 << 3)))
bd056d7e 1399 tf_flags |= ATA_TFLAG_FUA;
3aef5231
AL		 1400 break;
1401 default:
8bf62ece 1402 DPRINTK("no-byte command\n");
ae006510 1403 goto invalid_fld;
1da177e4
LT		 1404 }
1405
8bf62ece
AL		 1406 /* Check and compose ATA command */
1407 if (!n_block)
c187c4b5
AL		 1408 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1409 * length 0 means transfer 0 block of data.
1410 * However, for ATA R/W commands, sector count 0 means
1411 * 256 or 65536 sectors, not 0 sectors as in SCSI.
f51750d5
AC		 1412 *
1413 * WARNING: one or two older ATA drives treat 0 as 0...
c187c4b5 1414 */
ae006510 1415 goto nothing_to_do;
1da177e4 1416
bd056d7e 1417 qc->flags |= ATA_QCFLAG_IO;
726f0785 1418 qc->nbytes = n_block * ATA_SECT_SIZE;
1da177e4 1419
bd056d7e
TH		 1420 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1421 qc->tag);
1422 if (likely(rc == 0))
1423 return 0;
ae006510 1424
bd056d7e
TH		 1425 if (rc == -ERANGE)
1426 goto out_of_range;
1427 /* treat all other errors as -EINVAL, fall through */
ae006510 1428invalid_fld:
542b1444 1429 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
ae006510
DG		 1430 /* "Invalid field in cbd" */
1431 return 1;
1432
1433out_of_range:
542b1444 1434 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
ae006510
DG		 1435 /* "Logical Block Address out of range" */
1436 return 1;
1437
1438nothing_to_do:
542b1444 1439 scmd->result = SAM_STAT_GOOD;
ae006510 1440 return 1;
1da177e4
LT		 1441}
1442
77853bf2 1443static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1da177e4 1444{
c31f571d 1445 struct ata_port *ap = qc->ap;
1da177e4 1446 struct scsi_cmnd *cmd = qc->scsicmd;
a7dac447 1447 u8 *cdb = cmd->cmnd;
2dcb407e 1448 int need_sense = (qc->err_mask != 0);
b095518e
JG		 1449
1450 /* For ATA pass thru (SAT) commands, generate a sense block if
1451 * user mandated it or if there's an error. Note that if we
1452 * generate because the user forced us to, a check condition
1453 * is generated and the ATA register values are returned
1454 * whether the command completed successfully or not. If there
1455 * was no error, SK, ASC and ASCQ will all be zero.
1456 */
a7dac447 1457 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
2dcb407e 1458 ((cdb[2] & 0x20) || need_sense)) {
750426aa 1459 ata_gen_passthru_sense(qc);
b095518e
JG		 1460 } else {
1461 if (!need_sense) {
1462 cmd->result = SAM_STAT_GOOD;
1463 } else {
1464 /* TODO: decide which descriptor format to use
1465 * for 48b LBA devices and call that here
1466 * instead of the fixed desc, which is only
1467 * good for smaller LBA (and maybe CHS?)
1468 * devices.
1469 */
750426aa 1470 ata_gen_ata_sense(qc);
b095518e
JG		 1471 }
1472 }
1da177e4 1473
d9aca22c 1474 /* XXX: track spindown state for spindown skipping and warning */
13b8d09f
TH		 1475 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1476 qc->tf.command == ATA_CMD_STANDBYNOW1))
1477 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1478 else if (likely(system_state != SYSTEM_HALT &&
1479 system_state != SYSTEM_POWER_OFF))
1480 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1481
c31f571d 1482 if (need_sense && !ap->ops->error_handler)
44877b4e 1483 ata_dump_status(ap->print_id, &qc->result_tf);
1da177e4
LT		 1484
1485 qc->scsidone(cmd);
1486
77853bf2 1487 ata_qc_free(qc);
1da177e4
LT		 1488}
1489
1490/**
1491 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1da177e4
LT		 1492 * @dev: ATA device to which the command is addressed
1493 * @cmd: SCSI command to execute
1494 * @done: SCSI command completion function
1495 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1496 *
1497 * Our ->queuecommand() function has decided that the SCSI
1498 * command issued can be directly translated into an ATA
1499 * command, rather than handled internally.
1500 *
1501 * This function sets up an ata_queued_cmd structure for the
1502 * SCSI command, and sends that ata_queued_cmd to the hardware.
1503 *
ae006510
DG		 1504 * The xlat_func argument (actor) returns 0 if ready to execute
1505 * ATA command, else 1 to finish translation. If 1 is returned
1506 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1507 * to be set reflecting an error condition or clean (early)
1508 * termination.
1509 *
1da177e4 1510 * LOCKING:
cca3974e 1511 * spin_lock_irqsave(host lock)
2115ea94
TH		 1512 *
1513 * RETURNS:
1514 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1515 * needs to be deferred.
1da177e4 1516 */
2115ea94
TH		 1517static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1518 void (*done)(struct scsi_cmnd *),
1519 ata_xlat_func_t xlat_func)
1da177e4 1520{
31cc23b3 1521 struct ata_port *ap = dev->link->ap;
1da177e4 1522 struct ata_queued_cmd *qc;
31cc23b3 1523 int rc;
1da177e4
LT		 1524
1525 VPRINTK("ENTER\n");
1526
3373efd8 1527 qc = ata_scsi_qc_new(dev, cmd, done);
1da177e4 1528 if (!qc)
ae006510 1529 goto err_mem;
1da177e4
LT		 1530
1531 /* data is present; dma-map it */
be7db055 1532 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1533 cmd->sc_data_direction == DMA_TO_DEVICE) {
7120165c 1534 if (unlikely(scsi_bufflen(cmd) < 1)) {
f15a1daf
TH		 1535 ata_dev_printk(dev, KERN_WARNING,
1536 "WARNING: zero len r/w req\n");
ae006510 1537 goto err_did;
1da177e4
LT		 1538 }
1539
7120165c 1540 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1da177e4
LT		 1541
1542 qc->dma_dir = cmd->sc_data_direction;
1543 }
1544
1545 qc->complete_fn = ata_scsi_qc_complete;
1546
ad706991 1547 if (xlat_func(qc))
ae006510 1548 goto early_finish;
1da177e4 1549
31cc23b3
TH		 1550 if (ap->ops->qc_defer) {
1551 if ((rc = ap->ops->qc_defer(qc)))
1552 goto defer;
1553 }
1554
1da177e4 1555 /* select device, send command to hardware */
8e0e694a 1556 ata_qc_issue(qc);
1da177e4
LT		 1557
1558 VPRINTK("EXIT\n");
2115ea94 1559 return 0;
1da177e4 1560
ae006510 1561early_finish:
2dcb407e 1562 ata_qc_free(qc);
da071b42 1563 qc->scsidone(cmd);
ae006510 1564 DPRINTK("EXIT - early finish (good or error)\n");
2115ea94 1565 return 0;
ae006510
DG		 1566
1567err_did:
1da177e4 1568 ata_qc_free(qc);
ae006510 1569 cmd->result = (DID_ERROR << 16);
da071b42 1570 qc->scsidone(cmd);
253b92ec 1571err_mem:
ae006510 1572 DPRINTK("EXIT - internal\n");
2115ea94 1573 return 0;
3dc1d881
TH		 1574
1575defer:
31cc23b3 1576 ata_qc_free(qc);
3dc1d881 1577 DPRINTK("EXIT - defer\n");
31cc23b3
TH		 1578 if (rc == ATA_DEFER_LINK)
1579 return SCSI_MLQUEUE_DEVICE_BUSY;
1580 else
1581 return SCSI_MLQUEUE_HOST_BUSY;
1da177e4
LT		 1582}
1583
1584/**
1585 * ata_scsi_rbuf_get - Map response buffer.
1586 * @cmd: SCSI command containing buffer to be mapped.
1587 * @buf_out: Pointer to mapped area.
1588 *
1589 * Maps buffer contained within SCSI command @cmd.
1590 *
1591 * LOCKING:
cca3974e 1592 * spin_lock_irqsave(host lock)
1da177e4
LT		 1593 *
1594 * RETURNS:
1595 * Length of response buffer.
1596 */
1597
1598static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1599{
1600 u8 *buf;
1601 unsigned int buflen;
1602
7120165c 1603 struct scatterlist *sg = scsi_sglist(cmd);
1da177e4 1604
e10b8c3f 1605 if (sg) {
45711f1a 1606 buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
1da177e4
LT		 1607 buflen = sg->length;
1608 } else {
e10b8c3f
BH		 1609 buf = NULL;
1610 buflen = 0;
1da177e4
LT		 1611 }
1612
1613 *buf_out = buf;
1614 return buflen;
1615}
1616
1617/**
1618 * ata_scsi_rbuf_put - Unmap response buffer.
1619 * @cmd: SCSI command containing buffer to be unmapped.
1620 * @buf: buffer to unmap
1621 *
1622 * Unmaps response buffer contained within @cmd.
1623 *
1624 * LOCKING:
cca3974e 1625 * spin_lock_irqsave(host lock)
1da177e4
LT		 1626 */
1627
1628static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1629{
7120165c 1630 struct scatterlist *sg = scsi_sglist(cmd);
e10b8c3f 1631 if (sg)
da02d2a1 1632 kunmap_atomic(buf - sg->offset, KM_IRQ0);
1da177e4
LT		 1633}
1634
1635/**
1636 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1637 * @args: device IDENTIFY data / SCSI command of interest.
1638 * @actor: Callback hook for desired SCSI command simulator
1639 *
1640 * Takes care of the hard work of simulating a SCSI command...
1641 * Mapping the response buffer, calling the command's handler,
1642 * and handling the handler's return value. This return value
1643 * indicates whether the handler wishes the SCSI command to be
ae006510
DG		 1644 * completed successfully (0), or not (in which case cmd->result
1645 * and sense buffer are assumed to be set).
1da177e4
LT		 1646 *
1647 * LOCKING:
cca3974e 1648 * spin_lock_irqsave(host lock)
1da177e4
LT		 1649 */
1650
1651void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
2dcb407e
JG		 1652 unsigned int (*actor) (struct ata_scsi_args *args,
1653 u8 *rbuf, unsigned int buflen))
1da177e4
LT		 1654{
1655 u8 *rbuf;
1656 unsigned int buflen, rc;
1657 struct scsi_cmnd *cmd = args->cmd;
1658
1659 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1660 memset(rbuf, 0, buflen);
1661 rc = actor(args, rbuf, buflen);
1662 ata_scsi_rbuf_put(cmd, rbuf);
1663
ae006510 1664 if (rc == 0)
1da177e4 1665 cmd->result = SAM_STAT_GOOD;
ae006510 1666 args->done(cmd);
1da177e4
LT		 1667}
1668
6a36261e
TH		 1669/**
1670 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
1671 * @idx: byte index into SCSI response buffer
1672 * @val: value to set
1673 *
1674 * To be used by SCSI command simulator functions. This macros
1675 * expects two local variables, u8 *rbuf and unsigned int buflen,
1676 * are in scope.
1677 *
1678 * LOCKING:
1679 * None.
1680 */
1681#define ATA_SCSI_RBUF_SET(idx, val) do { \
1682 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
1683 } while (0)
1684
1da177e4
LT		 1685/**
1686 * ata_scsiop_inq_std - Simulate INQUIRY command
1687 * @args: device IDENTIFY data / SCSI command of interest.
1688 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1689 * @buflen: Response buffer length.
1690 *
1691 * Returns standard device identification data associated
b142eb65 1692 * with non-VPD INQUIRY command output.
1da177e4
LT		 1693 *
1694 * LOCKING:
cca3974e 1695 * spin_lock_irqsave(host lock)
1da177e4
LT		 1696 */
1697
1698unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1699 unsigned int buflen)
1700{
1701 u8 hdr[] = {
1702 TYPE_DISK,
1703 0,
1704 0x5, /* claim SPC-3 version compatibility */
1705 2,
1706 95 - 4
1707 };
1708
1709 /* set scsi removeable (RMB) bit per ata bit */
1710 if (ata_id_removeable(args->id))
1711 hdr[1] |= (1 << 7);
1712
1713 VPRINTK("ENTER\n");
1714
1715 memcpy(rbuf, hdr, sizeof(hdr));
1716
1717 if (buflen > 35) {
1718 memcpy(&rbuf[8], "ATA ", 8);
a0cf733b
TH		 1719 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1720 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1da177e4
LT		 1721 if (rbuf[32] == 0 || rbuf[32] == ' ')
1722 memcpy(&rbuf[32], "n/a ", 4);
1723 }
1724
1725 if (buflen > 63) {
1726 const u8 versions[] = {
1727 0x60, /* SAM-3 (no version claimed) */
1728
1729 0x03,
1730 0x20, /* SBC-2 (no version claimed) */
1731
1732 0x02,
1733 0x60 /* SPC-3 (no version claimed) */
1734 };
1735
1736 memcpy(rbuf + 59, versions, sizeof(versions));
1737 }
1738
1739 return 0;
1740}
1741
1742/**
b142eb65 1743 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1da177e4
LT		 1744 * @args: device IDENTIFY data / SCSI command of interest.
1745 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1746 * @buflen: Response buffer length.
1747 *
b142eb65 1748 * Returns list of inquiry VPD pages available.
1da177e4
LT		 1749 *
1750 * LOCKING:
cca3974e 1751 * spin_lock_irqsave(host lock)
1da177e4
LT		 1752 */
1753
1754unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1755 unsigned int buflen)
1756{
1757 const u8 pages[] = {
1758 0x00, /* page 0x00, this page */
1759 0x80, /* page 0x80, unit serial no page */
1760 0x83 /* page 0x83, device ident page */
1761 };
b142eb65 1762 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1da177e4
LT		 1763
1764 if (buflen > 6)
1765 memcpy(rbuf + 4, pages, sizeof(pages));
1766
1767 return 0;
1768}
1769
1770/**
b142eb65 1771 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1da177e4
LT		 1772 * @args: device IDENTIFY data / SCSI command of interest.
1773 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1774 * @buflen: Response buffer length.
1775 *
1776 * Returns ATA device serial number.
1777 *
1778 * LOCKING:
cca3974e 1779 * spin_lock_irqsave(host lock)
1da177e4
LT		 1780 */
1781
1782unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1783 unsigned int buflen)
1784{
1785 const u8 hdr[] = {
1786 0,
1787 0x80, /* this page code */
1788 0,
a0cf733b 1789 ATA_ID_SERNO_LEN, /* page len */
1da177e4
LT		 1790 };
1791 memcpy(rbuf, hdr, sizeof(hdr));
1792
a0cf733b 1793 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
6a62a04d 1794 ata_id_string(args->id, (unsigned char *) &rbuf[4],
a0cf733b 1795 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1da177e4
LT		 1796
1797 return 0;
1798}
1799
1da177e4 1800/**
b142eb65 1801 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1da177e4
LT		 1802 * @args: device IDENTIFY data / SCSI command of interest.
1803 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1804 * @buflen: Response buffer length.
1805 *
b142eb65
JG		 1806 * Yields two logical unit device identification designators:
1807 * - vendor specific ASCII containing the ATA serial number
1808 * - SAT defined "t10 vendor id based" containing ASCII vendor
1809 * name ("ATA "), model and serial numbers.
1da177e4
LT		 1810 *
1811 * LOCKING:
cca3974e 1812 * spin_lock_irqsave(host lock)
1da177e4
LT		 1813 */
1814
1815unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1816 unsigned int buflen)
1817{
b142eb65
JG		 1818 int num;
1819 const int sat_model_serial_desc_len = 68;
1da177e4 1820
b142eb65
JG		 1821 rbuf[1] = 0x83; /* this page code */
1822 num = 4;
1823
a0cf733b 1824 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
b142eb65 1825 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2e9edbf8 1826 rbuf[num + 0] = 2;
a0cf733b 1827 rbuf[num + 3] = ATA_ID_SERNO_LEN;
b142eb65
JG		 1828 num += 4;
1829 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1830 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1831 num += ATA_ID_SERNO_LEN;
1da177e4 1832 }
b142eb65
JG		 1833 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1834 /* SAT defined lu model and serial numbers descriptor */
1835 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2e9edbf8
JG		 1836 rbuf[num + 0] = 2;
1837 rbuf[num + 1] = 1;
b142eb65
JG		 1838 rbuf[num + 3] = sat_model_serial_desc_len;
1839 num += 4;
1840 memcpy(rbuf + num, "ATA ", 8);
1841 num += 8;
1842 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1843 ATA_ID_PROD, ATA_ID_PROD_LEN);
1844 num += ATA_ID_PROD_LEN;
b142eb65 1845 ata_id_string(args->id, (unsigned char *) rbuf + num,
a0cf733b
TH		 1846 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1847 num += ATA_ID_SERNO_LEN;
b142eb65
JG		 1848 }
1849 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1da177e4
LT		 1850 return 0;
1851}
1852
ad355b46
JG		 1853/**
1854 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
1855 * @args: device IDENTIFY data / SCSI command of interest.
1856 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1857 * @buflen: Response buffer length.
1858 *
1859 * Yields SAT-specified ATA VPD page.
1860 *
1861 * LOCKING:
1862 * spin_lock_irqsave(host lock)
1863 */
1864
1865unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf,
1866 unsigned int buflen)
1867{
1868 u8 pbuf[60];
1869 struct ata_taskfile tf;
1870 unsigned int i;
1871
1872 if (!buflen)
1873 return 0;
1874
1875 memset(&pbuf, 0, sizeof(pbuf));
1876 memset(&tf, 0, sizeof(tf));
1877
1878 pbuf[1] = 0x89; /* our page code */
1879 pbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
1880 pbuf[3] = (0x238 & 0xff);
1881
c78968bb
JG		 1882 memcpy(&pbuf[8], "linux ", 8);
1883 memcpy(&pbuf[16], "libata ", 16);
1884 memcpy(&pbuf[32], DRV_VERSION, 4);
ad355b46
JG		 1885 ata_id_string(args->id, &pbuf[32], ATA_ID_FW_REV, 4);
1886
1887 /* we don't store the ATA device signature, so we fake it */
1888
1889 tf.command = ATA_DRDY; /* really, this is Status reg */
1890 tf.lbal = 0x1;
1891 tf.nsect = 0x1;
1892
1893 ata_tf_to_fis(&tf, 0, 1, &pbuf[36]); /* TODO: PMP? */
1894 pbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
1895
1896 pbuf[56] = ATA_CMD_ID_ATA;
1897
1898 i = min(buflen, 60U);
1899 memcpy(rbuf, &pbuf[0], i);
1900 buflen -= i;
1901
1902 if (!buflen)
1903 return 0;
1904
1905 memcpy(&rbuf[60], &args->id[0], min(buflen, 512U));
1906 return 0;
1907}
1908
1da177e4 1909/**
0cba632b 1910 * ata_scsiop_noop - Command handler that simply returns success.
1da177e4
LT		 1911 * @args: device IDENTIFY data / SCSI command of interest.
1912 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1913 * @buflen: Response buffer length.
1914 *
1915 * No operation. Simply returns success to caller, to indicate
1916 * that the caller should successfully complete this SCSI command.
1917 *
1918 * LOCKING:
cca3974e 1919 * spin_lock_irqsave(host lock)
1da177e4
LT		 1920 */
1921
1922unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1923 unsigned int buflen)
1924{
1925 VPRINTK("ENTER\n");
1926 return 0;
1927}
1928
1929/**
1930 * ata_msense_push - Push data onto MODE SENSE data output buffer
1931 * @ptr_io: (input/output) Location to store more output data
1932 * @last: End of output data buffer
1933 * @buf: Pointer to BLOB being added to output buffer
1934 * @buflen: Length of BLOB
1935 *
1936 * Store MODE SENSE data on an output buffer.
1937 *
1938 * LOCKING:
1939 * None.
1940 */
1941
1942static void ata_msense_push(u8 **ptr_io, const u8 *last,
1943 const u8 *buf, unsigned int buflen)
1944{
1945 u8 *ptr = *ptr_io;
1946
1947 if ((ptr + buflen - 1) > last)
1948 return;
1949
1950 memcpy(ptr, buf, buflen);
1951
1952 ptr += buflen;
1953
1954 *ptr_io = ptr;
1955}
1956
1957/**
1958 * ata_msense_caching - Simulate MODE SENSE caching info page
1959 * @id: device IDENTIFY data
1960 * @ptr_io: (input/output) Location to store more output data
1961 * @last: End of output data buffer
1962 *
1963 * Generate a caching info page, which conditionally indicates
1964 * write caching to the SCSI layer, depending on device
1965 * capabilities.
1966 *
1967 * LOCKING:
1968 * None.
1969 */
1970
1971static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1972 const u8 *last)
1973{
00ac37f5 1974 u8 page[CACHE_MPAGE_LEN];
1da177e4 1975
00ac37f5 1976 memcpy(page, def_cache_mpage, sizeof(page));
1da177e4
LT		 1977 if (ata_id_wcache_enabled(id))
1978 page[2] |= (1 << 2); /* write cache enable */
1979 if (!ata_id_rahead_enabled(id))
1980 page[12] |= (1 << 5); /* disable read ahead */
1981
1982 ata_msense_push(ptr_io, last, page, sizeof(page));
1983 return sizeof(page);
1984}
1985
1986/**
1987 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1988 * @dev: Device associated with this MODE SENSE command
1989 * @ptr_io: (input/output) Location to store more output data
1990 * @last: End of output data buffer
1991 *
1992 * Generate a generic MODE SENSE control mode page.
1993 *
1994 * LOCKING:
1995 * None.
1996 */
1997
1998static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1999{
00ac37f5
DG		 2000 ata_msense_push(ptr_io, last, def_control_mpage,
2001 sizeof(def_control_mpage));
2002 return sizeof(def_control_mpage);
1da177e4
LT		 2003}
2004
2005/**
2006 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2007 * @dev: Device associated with this MODE SENSE command
2008 * @ptr_io: (input/output) Location to store more output data
2009 * @last: End of output data buffer
2010 *
2011 * Generate a generic MODE SENSE r/w error recovery page.
2012 *
2013 * LOCKING:
2014 * None.
2015 */
2016
2017static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
2018{
1da177e4 2019
00ac37f5
DG		 2020 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
2021 sizeof(def_rw_recovery_mpage));
2022 return sizeof(def_rw_recovery_mpage);
1da177e4
LT		 2023}
2024
48bdc8ec
JA		 2025/*
2026 * We can turn this into a real blacklist if it's needed, for now just
2027 * blacklist any Maxtor BANC1G10 revision firmware
2028 */
2029static int ata_dev_supports_fua(u16 *id)
2030{
a0cf733b 2031 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
48bdc8ec 2032
c3c013a2
JG		 2033 if (!libata_fua)
2034 return 0;
48bdc8ec
JA		 2035 if (!ata_id_has_fua(id))
2036 return 0;
2037
a0cf733b
TH		 2038 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2039 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
48bdc8ec 2040
2e02671d 2041 if (strcmp(model, "Maxtor"))
48bdc8ec 2042 return 1;
2e02671d 2043 if (strcmp(fw, "BANC1G10"))
48bdc8ec
JA		 2044 return 1;
2045
2046 return 0; /* blacklisted */
2047}
2048
1da177e4
LT		 2049/**
2050 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2051 * @args: device IDENTIFY data / SCSI command of interest.
2052 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2053 * @buflen: Response buffer length.
2054 *
00ac37f5
DG		 2055 * Simulate MODE SENSE commands. Assume this is invoked for direct
2056 * access devices (e.g. disks) only. There should be no block
2057 * descriptor for other device types.
1da177e4
LT		 2058 *
2059 * LOCKING:
cca3974e 2060 * spin_lock_irqsave(host lock)
1da177e4
LT		 2061 */
2062
2063unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2064 unsigned int buflen)
2065{
9a3dccc4 2066 struct ata_device *dev = args->dev;
1da177e4 2067 u8 *scsicmd = args->cmd->cmnd, *p, *last;
00ac37f5
DG		 2068 const u8 sat_blk_desc[] = {
2069 0, 0, 0, 0, /* number of blocks: sat unspecified */
2070 0,
2071 0, 0x2, 0x0 /* block length: 512 bytes */
2072 };
2073 u8 pg, spg;
2074 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
9a3dccc4 2075 u8 dpofua;
1da177e4
LT		 2076
2077 VPRINTK("ENTER\n");
2078
2079 six_byte = (scsicmd[0] == MODE_SENSE);
00ac37f5
DG		 2080 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2081 /*
2082 * LLBA bit in msense(10) ignored (compliant)
1da177e4 2083 */
00ac37f5 2084
1da177e4 2085 page_control = scsicmd[2] >> 6;
ae006510
DG		 2086 switch (page_control) {
2087 case 0: /* current */
2088 break; /* supported */
2089 case 3: /* saved */
2090 goto saving_not_supp;
2091 case 1: /* changeable */
2092 case 2: /* defaults */
2093 default:
2094 goto invalid_fld;
2095 }
1da177e4 2096
00ac37f5
DG		 2097 if (six_byte) {
2098 output_len = 4 + (ebd ? 8 : 0);
2099 alloc_len = scsicmd[4];
2100 } else {
2101 output_len = 8 + (ebd ? 8 : 0);
2102 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2103 }
2104 minlen = (alloc_len < buflen) ? alloc_len : buflen;
1da177e4
LT		 2105
2106 p = rbuf + output_len;
00ac37f5 2107 last = rbuf + minlen - 1;
1da177e4 2108
00ac37f5
DG		 2109 pg = scsicmd[2] & 0x3f;
2110 spg = scsicmd[3];
2111 /*
2112 * No mode subpages supported (yet) but asking for _all_
2113 * subpages may be valid
2114 */
2115 if (spg && (spg != ALL_SUB_MPAGES))
2116 goto invalid_fld;
2117
2118 switch(pg) {
2119 case RW_RECOVERY_MPAGE:
1da177e4
LT		 2120 output_len += ata_msense_rw_recovery(&p, last);
2121 break;
2122
00ac37f5 2123 case CACHE_MPAGE:
1da177e4
LT		 2124 output_len += ata_msense_caching(args->id, &p, last);
2125 break;
2126
00ac37f5 2127 case CONTROL_MPAGE: {
1da177e4
LT		 2128 output_len += ata_msense_ctl_mode(&p, last);
2129 break;
2130 }
2131
00ac37f5 2132 case ALL_MPAGES:
1da177e4
LT		 2133 output_len += ata_msense_rw_recovery(&p, last);
2134 output_len += ata_msense_caching(args->id, &p, last);
2135 output_len += ata_msense_ctl_mode(&p, last);
2136 break;
2137
2138 default: /* invalid page code */
ae006510 2139 goto invalid_fld;
1da177e4
LT		 2140 }
2141
00ac37f5
DG		 2142 if (minlen < 1)
2143 return 0;
9a3dccc4
TH		 2144
2145 dpofua = 0;
f79d409f 2146 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
9a3dccc4
TH		 2147 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2148 dpofua = 1 << 4;
2149
1da177e4
LT		 2150 if (six_byte) {
2151 output_len--;
2152 rbuf[0] = output_len;
9a3dccc4
TH		 2153 if (minlen > 2)
2154 rbuf[2] |= dpofua;
00ac37f5
DG		 2155 if (ebd) {
2156 if (minlen > 3)
2157 rbuf[3] = sizeof(sat_blk_desc);
2158 if (minlen > 11)
2159 memcpy(rbuf + 4, sat_blk_desc,
2160 sizeof(sat_blk_desc));
2161 }
1da177e4
LT		 2162 } else {
2163 output_len -= 2;
2164 rbuf[0] = output_len >> 8;
00ac37f5
DG		 2165 if (minlen > 1)
2166 rbuf[1] = output_len;
9a3dccc4
TH		 2167 if (minlen > 3)
2168 rbuf[3] |= dpofua;
00ac37f5
DG		 2169 if (ebd) {
2170 if (minlen > 7)
2171 rbuf[7] = sizeof(sat_blk_desc);
2172 if (minlen > 15)
2173 memcpy(rbuf + 8, sat_blk_desc,
2174 sizeof(sat_blk_desc));
2175 }
1da177e4 2176 }
1da177e4 2177 return 0;
ae006510
DG		 2178
2179invalid_fld:
2180 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2181 /* "Invalid field in cbd" */
2182 return 1;
2183
2184saving_not_supp:
2185 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2186 /* "Saving parameters not supported" */
2187 return 1;
1da177e4
LT		 2188}
2189
2190/**
2191 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2192 * @args: device IDENTIFY data / SCSI command of interest.
2193 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2194 * @buflen: Response buffer length.
2195 *
2196 * Simulate READ CAPACITY commands.
2197 *
2198 * LOCKING:
6a36261e 2199 * None.
1da177e4 2200 */
1da177e4 2201unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2dcb407e 2202 unsigned int buflen)
1da177e4 2203{
6a36261e 2204 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
1da177e4
LT		 2205
2206 VPRINTK("ENTER\n");
2207
1da177e4 2208 if (args->cmd->cmnd[0] == READ_CAPACITY) {
6a36261e
TH		 2209 if (last_lba >= 0xffffffffULL)
2210 last_lba = 0xffffffff;
0c144d0d 2211
1da177e4 2212 /* sector count, 32-bit */
6a36261e
TH		 2213 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
2214 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
2215 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
2216 ATA_SCSI_RBUF_SET(3, last_lba);
1da177e4
LT		 2217
2218 /* sector size */
6a36261e 2219 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
4ca4e439 2220 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE & 0xff);
1da177e4
LT		 2221 } else {
2222 /* sector count, 64-bit */
6a36261e
TH		 2223 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
2224 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
2225 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
2226 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
2227 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
2228 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
2229 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
2230 ATA_SCSI_RBUF_SET(7, last_lba);
1da177e4
LT		 2231
2232 /* sector size */
6a36261e 2233 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
4ca4e439 2234 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE & 0xff);
1da177e4
LT		 2235 }
2236
2237 return 0;
2238}
2239
2240/**
2241 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2242 * @args: device IDENTIFY data / SCSI command of interest.
2243 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2244 * @buflen: Response buffer length.
2245 *
2246 * Simulate REPORT LUNS command.
2247 *
2248 * LOCKING:
cca3974e 2249 * spin_lock_irqsave(host lock)
1da177e4
LT		 2250 */
2251
2252unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2253 unsigned int buflen)
2254{
2255 VPRINTK("ENTER\n");
2256 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2257
2258 return 0;
2259}
2260
845c5834
DG		 2261/**
2262 * ata_scsi_set_sense - Set SCSI sense data and status
2263 * @cmd: SCSI request to be handled
2264 * @sk: SCSI-defined sense key
2265 * @asc: SCSI-defined additional sense code
2266 * @ascq: SCSI-defined additional sense code qualifier
2267 *
2268 * Helper function that builds a valid fixed format, current
2269 * response code and the given sense key (sk), additional sense
2270 * code (asc) and additional sense code qualifier (ascq) with
2271 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2272 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2273 *
2274 * LOCKING:
2275 * Not required
2276 */
2277
2278void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2279{
2280 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2281
2282 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2283 cmd->sense_buffer[2] = sk;
2284 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2285 cmd->sense_buffer[12] = asc;
2286 cmd->sense_buffer[13] = ascq;
2287}
2288
1da177e4
LT		 2289/**
2290 * ata_scsi_badcmd - End a SCSI request with an error
2291 * @cmd: SCSI request to be handled
2292 * @done: SCSI command completion function
2293 * @asc: SCSI-defined additional sense code
2294 * @ascq: SCSI-defined additional sense code qualifier
2295 *
2296 * Helper function that completes a SCSI command with
2297 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2298 * and the specified additional sense codes.
2299 *
2300 * LOCKING:
cca3974e 2301 * spin_lock_irqsave(host lock)
1da177e4
LT		 2302 */
2303
2304void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2305{
2306 DPRINTK("ENTER\n");
ae006510 2307 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
1da177e4
LT		 2308
2309 done(cmd);
2310}
2311
77853bf2 2312static void atapi_sense_complete(struct ata_queued_cmd *qc)
a939c963 2313{
74e6c8c3 2314 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
c6e6e666
JG		 2315 /* FIXME: not quite right; we don't want the
2316 * translation of taskfile registers into
2317 * a sense descriptors, since that's only
2318 * correct for ATA, not ATAPI
2319 */
750426aa 2320 ata_gen_passthru_sense(qc);
74e6c8c3 2321 }
a939c963 2322
c6e6e666 2323 qc->scsidone(qc->scsicmd);
77853bf2 2324 ata_qc_free(qc);
c6e6e666 2325}
a939c963 2326
c6e6e666
JG		 2327/* is it pointless to prefer PIO for "safety reasons"? */
2328static inline int ata_pio_use_silly(struct ata_port *ap)
2329{
2330 return (ap->flags & ATA_FLAG_PIO_DMA);
2331}
2332
2333static void atapi_request_sense(struct ata_queued_cmd *qc)
2334{
2335 struct ata_port *ap = qc->ap;
2336 struct scsi_cmnd *cmd = qc->scsicmd;
2337
2338 DPRINTK("ATAPI request sense\n");
a939c963
JG		 2339
2340 /* FIXME: is this needed? */
7ccd720d 2341 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
a939c963 2342
c6e6e666
JG		 2343 ap->ops->tf_read(ap, &qc->tf);
2344
2345 /* fill these in, for the case where they are -not- overwritten */
2346 cmd->sense_buffer[0] = 0x70;
2347 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2348
2349 ata_qc_reinit(qc);
2350
93f8fecb 2351 /* setup sg table and init transfer direction */
cadb7345 2352 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
93f8fecb 2353 ata_sg_init(qc, &qc->sgent, 1);
a939c963
JG		 2354 qc->dma_dir = DMA_FROM_DEVICE;
2355
6e7846e9 2356 memset(&qc->cdb, 0, qc->dev->cdb_len);
a939c963
JG		 2357 qc->cdb[0] = REQUEST_SENSE;
2358 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2359
2360 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2361 qc->tf.command = ATA_CMD_PACKET;
2362
c6e6e666 2363 if (ata_pio_use_silly(ap)) {
0dc36888 2364 qc->tf.protocol = ATAPI_PROT_DMA;
c6e6e666
JG		 2365 qc->tf.feature |= ATAPI_PKT_DMA;
2366 } else {
0dc36888 2367 qc->tf.protocol = ATAPI_PROT_PIO;
2db78dd3
AC		 2368 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2369 qc->tf.lbah = 0;
c6e6e666 2370 }
a939c963
JG		 2371 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2372
c6e6e666 2373 qc->complete_fn = atapi_sense_complete;
a939c963 2374
8e0e694a 2375 ata_qc_issue(qc);
a939c963
JG		 2376
2377 DPRINTK("EXIT\n");
2378}
2379
77853bf2 2380static void atapi_qc_complete(struct ata_queued_cmd *qc)
1da177e4
LT		 2381{
2382 struct scsi_cmnd *cmd = qc->scsicmd;
a22e2eb0 2383 unsigned int err_mask = qc->err_mask;
1da177e4 2384
a7dac447 2385 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
e12669e7 2386
246619da
TH		 2387 /* handle completion from new EH */
2388 if (unlikely(qc->ap->ops->error_handler &&
2389 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2390
2391 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2392 /* FIXME: not quite right; we don't want the
2393 * translation of taskfile registers into a
2394 * sense descriptors, since that's only
2395 * correct for ATA, not ATAPI
2396 */
750426aa 2397 ata_gen_passthru_sense(qc);
246619da
TH		 2398 }
2399
22aac089
TH		 2400 /* SCSI EH automatically locks door if sdev->locked is
2401 * set. Sometimes door lock request continues to
2402 * fail, for example, when no media is present. This
2403 * creates a loop - SCSI EH issues door lock which
2404 * fails and gets invoked again to acquire sense data
2405 * for the failed command.
2406 *
2407 * If door lock fails, always clear sdev->locked to
2408 * avoid this infinite loop.
2409 */
2410 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2411 qc->dev->sdev->locked = 0;
2412
246619da
TH		 2413 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2414 qc->scsidone(cmd);
2415 ata_qc_free(qc);
2416 return;
2417 }
2418
2419 /* successful completion or old EH failure path */
a7dac447 2420 if (unlikely(err_mask & AC_ERR_DEV)) {
1da177e4 2421 cmd->result = SAM_STAT_CHECK_CONDITION;
c6e6e666 2422 atapi_request_sense(qc);
77853bf2 2423 return;
74e6c8c3 2424 } else if (unlikely(err_mask)) {
a7dac447
JG		 2425 /* FIXME: not quite right; we don't want the
2426 * translation of taskfile registers into
2427 * a sense descriptors, since that's only
2428 * correct for ATA, not ATAPI
2429 */
750426aa 2430 ata_gen_passthru_sense(qc);
74e6c8c3 2431 } else {
1da177e4
LT		 2432 u8 *scsicmd = cmd->cmnd;
2433
fd71da46 2434 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
1da177e4
LT		 2435 u8 *buf = NULL;
2436 unsigned int buflen;
2437
2438 buflen = ata_scsi_rbuf_get(cmd, &buf);
a15dbeb4
JG		 2439
2440 /* ATAPI devices typically report zero for their SCSI version,
2441 * and sometimes deviate from the spec WRT response data
2442 * format. If SCSI version is reported as zero like normal,
2443 * then we make the following fixups: 1) Fake MMC-5 version,
2444 * to indicate to the Linux scsi midlayer this is a modern
2445 * device. 2) Ensure response data format / ATAPI information
2446 * are always correct.
a15dbeb4
JG		 2447 */
2448 if (buf[2] == 0) {
2449 buf[2] = 0x5;
2450 buf[3] = 0x32;
2451 }
2452
1da177e4
LT		 2453 ata_scsi_rbuf_put(cmd, buf);
2454 }
a15dbeb4 2455
1da177e4
LT		 2456 cmd->result = SAM_STAT_GOOD;
2457 }
2458
2459 qc->scsidone(cmd);
77853bf2 2460 ata_qc_free(qc);
1da177e4
LT		 2461}
2462/**
2463 * atapi_xlat - Initialize PACKET taskfile
2464 * @qc: command structure to be initialized
1da177e4
LT		 2465 *
2466 * LOCKING:
cca3974e 2467 * spin_lock_irqsave(host lock)
1da177e4
LT		 2468 *
2469 * RETURNS:
2470 * Zero on success, non-zero on failure.
2471 */
ad706991 2472static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
1da177e4 2473{
542b1444 2474 struct scsi_cmnd *scmd = qc->scsicmd;
1da177e4
LT		 2475 struct ata_device *dev = qc->dev;
2476 int using_pio = (dev->flags & ATA_DFLAG_PIO);
542b1444 2477 int nodata = (scmd->sc_data_direction == DMA_NONE);
2db78dd3 2478 unsigned int nbytes;
1da177e4 2479
2e5704f6
TH		 2480 memset(qc->cdb, 0, dev->cdb_len);
2481 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
1da177e4
LT		 2482
2483 qc->complete_fn = atapi_qc_complete;
2484
2485 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
542b1444 2486 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1da177e4
LT		 2487 qc->tf.flags |= ATA_TFLAG_WRITE;
2488 DPRINTK("direction: write\n");
2489 }
2490
2491 qc->tf.command = ATA_CMD_PACKET;
7120165c 2492 qc->nbytes = scsi_bufflen(scmd);
e00f1ff3
TH		 2493
2494 /* check whether ATAPI DMA is safe */
2495 if (!using_pio && ata_check_atapi_dma(qc))
2496 using_pio = 1;
1da177e4 2497
e190222d
TH		 2498 /* Some controller variants snoop this value for Packet
2499 * transfers to do state machine and FIFO management. Thus we
2500 * want to set it properly, and for DMA where it is
2501 * effectively meaningless.
2502 */
2db78dd3
AC		 2503 nbytes = min(qc->nbytes, (unsigned int)63 * 1024);
2504
e190222d
TH		 2505 /* Most ATAPI devices which honor transfer chunk size don't
2506 * behave according to the spec when odd chunk size which
2507 * matches the transfer length is specified. If the number of
2508 * bytes to transfer is 2n+1. According to the spec, what
2509 * should happen is to indicate that 2n+1 is going to be
2510 * transferred and transfer 2n+2 bytes where the last byte is
2511 * padding.
2512 *
2513 * In practice, this doesn't happen. ATAPI devices first
2514 * indicate and transfer 2n bytes and then indicate and
2515 * transfer 2 bytes where the last byte is padding.
2516 *
2517 * This inconsistency confuses several controllers which
2518 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2519 * These controllers use actual number of transferred bytes to
2520 * update DMA poitner and transfer of 4n+2 bytes make those
2521 * controller push DMA pointer by 4n+4 bytes because SATA data
2522 * FISes are aligned to 4 bytes. This causes data corruption
2523 * and buffer overrun.
2524 *
2525 * Always setting nbytes to even number solves this problem
2526 * because then ATAPI devices don't have to split data at 2n
2527 * boundaries.
2528 */
2529 if (nbytes & 0x1)
2530 nbytes++;
2531
2db78dd3
AC		 2532 qc->tf.lbam = (nbytes & 0xFF);
2533 qc->tf.lbah = (nbytes >> 8);
2534
1da177e4 2535 if (using_pio || nodata) {
e00f1ff3 2536 /* no data, or PIO data xfer */
1da177e4 2537 if (nodata)
0dc36888 2538 qc->tf.protocol = ATAPI_PROT_NODATA;
1da177e4 2539 else
0dc36888 2540 qc->tf.protocol = ATAPI_PROT_PIO;
e00f1ff3
TH		 2541 } else {
2542 /* DMA data xfer */
0dc36888 2543 qc->tf.protocol = ATAPI_PROT_DMA;
1da177e4
LT		 2544 qc->tf.feature |= ATAPI_PKT_DMA;
2545
542b1444 2546 if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
95de719a 2547 /* some SATA bridges need us to indicate data xfer direction */
1da177e4 2548 qc->tf.feature |= ATAPI_DMADIR;
1da177e4
LT		 2549 }
2550
2db78dd3
AC		 2551
2552 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2553 as ATAPI tape drives don't get this right otherwise */
1da177e4
LT		 2554 return 0;
2555}
2556
2dcb407e 2557static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
ab5b3a5b 2558{
41bda9c9
TH		 2559 if (ap->nr_pmp_links == 0) {
2560 if (likely(devno < ata_link_max_devices(&ap->link)))
2561 return &ap->link.device[devno];
2562 } else {
2563 if (likely(devno < ap->nr_pmp_links))
2564 return &ap->pmp_link[devno].device[0];
2565 }
2566
ab5b3a5b
TH		 2567 return NULL;
2568}
2569
2dcb407e
JG		 2570static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2571 const struct scsi_device *scsidev)
ab5b3a5b 2572{
41bda9c9
TH		 2573 int devno;
2574
ab5b3a5b 2575 /* skip commands not addressed to targets we simulate */
41bda9c9
TH		 2576 if (ap->nr_pmp_links == 0) {
2577 if (unlikely(scsidev->channel || scsidev->lun))
2578 return NULL;
2579 devno = scsidev->id;
2580 } else {
2581 if (unlikely(scsidev->id || scsidev->lun))
2582 return NULL;
2583 devno = scsidev->channel;
2584 }
ab5b3a5b 2585
41bda9c9 2586 return ata_find_dev(ap, devno);
ab5b3a5b
TH		 2587}
2588
99ba9e09
BK		 2589/**
2590 * ata_scsi_dev_enabled - determine if device is enabled
2591 * @dev: ATA device
2592 *
2593 * Determine if commands should be sent to the specified device.
2594 *
2595 * LOCKING:
cca3974e 2596 * spin_lock_irqsave(host lock)
99ba9e09
BK		 2597 *
2598 * RETURNS:
2599 * 0 if commands are not allowed / 1 if commands are allowed
2600 */
2601
2602static int ata_scsi_dev_enabled(struct ata_device *dev)
2603{
2604 if (unlikely(!ata_dev_enabled(dev)))
2605 return 0;
2606
9af5c9c9 2607 if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
99ba9e09
BK		 2608 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2609 ata_dev_printk(dev, KERN_WARNING,
2610 "WARNING: ATAPI is %s, device ignored.\n",
2611 atapi_enabled ? "not supported with this driver" : "disabled");
2612 return 0;
2613 }
2614 }
2615
2616 return 1;
2617}
2618
1da177e4
LT		 2619/**
2620 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2621 * @ap: ATA port to which the device is attached
2622 * @scsidev: SCSI device from which we derive the ATA device
2623 *
2624 * Given various information provided in struct scsi_cmnd,
2625 * map that onto an ATA bus, and using that mapping
2626 * determine which ata_device is associated with the
2627 * SCSI command to be sent.
2628 *
2629 * LOCKING:
cca3974e 2630 * spin_lock_irqsave(host lock)
1da177e4
LT		 2631 *
2632 * RETURNS:
2633 * Associated ATA device, or %NULL if not found.
2634 */
1da177e4 2635static struct ata_device *
057ace5e 2636ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1da177e4 2637{
ab5b3a5b 2638 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
1da177e4 2639
99ba9e09 2640 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
1da177e4
LT		 2641 return NULL;
2642
1da177e4
LT		 2643 return dev;
2644}
2645
b095518e
JG		 2646/*
2647 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2648 * @byte1: Byte 1 from pass-thru CDB.
2649 *
2650 * RETURNS:
2651 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2652 */
2653static u8
2654ata_scsi_map_proto(u8 byte1)
2655{
2656 switch((byte1 & 0x1e) >> 1) {
2dcb407e
JG		 2657 case 3: /* Non-data */
2658 return ATA_PROT_NODATA;
2659
2660 case 6: /* DMA */
2661 case 10: /* UDMA Data-in */
2662 case 11: /* UDMA Data-Out */
2663 return ATA_PROT_DMA;
2664
2665 case 4: /* PIO Data-in */
2666 case 5: /* PIO Data-out */
2667 return ATA_PROT_PIO;
2668
2669 case 0: /* Hard Reset */
2670 case 1: /* SRST */
2671 case 8: /* Device Diagnostic */
2672 case 9: /* Device Reset */
2673 case 7: /* DMA Queued */
2674 case 12: /* FPDMA */
2675 case 15: /* Return Response Info */
2676 default: /* Reserved */
2677 break;
b095518e
JG		 2678 }
2679
2680 return ATA_PROT_UNKNOWN;
2681}
2682
2683/**
2684 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2685 * @qc: command structure to be initialized
b095518e
JG		 2686 *
2687 * Handles either 12 or 16-byte versions of the CDB.
2688 *
2689 * RETURNS:
2690 * Zero on success, non-zero on failure.
2691 */
ad706991 2692static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
b095518e
JG		 2693{
2694 struct ata_taskfile *tf = &(qc->tf);
542b1444 2695 struct scsi_cmnd *scmd = qc->scsicmd;
f79d409f 2696 struct ata_device *dev = qc->dev;
ad706991 2697 const u8 *cdb = scmd->cmnd;
b095518e 2698
542b1444 2699 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
9a405257 2700 goto invalid_fld;
8190bdb9 2701
ae8d4ee7
AC		 2702 /*
2703 * Filter TPM commands by default. These provide an
2704 * essentially uncontrolled encrypted "back door" between
2705 * applications and the disk. Set libata.allow_tpm=1 if you
2706 * have a real reason for wanting to use them. This ensures
2707 * that installed software cannot easily mess stuff up without
2708 * user intent. DVR type users will probably ship with this enabled
2709 * for movie content management.
2710 *
2711 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2712 * for this and should do in future but that it is not sufficient as
2713 * DCS is an optional feature set. Thus we also do the software filter
2714 * so that we comply with the TC consortium stated goal that the user
2715 * can turn off TC features of their system.
2716 */
2717 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2718 goto invalid_fld;
2719
f79d409f
AC		 2720 /* We may not issue DMA commands if no DMA mode is set */
2721 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2722 goto invalid_fld;
b095518e
JG		 2723
2724 /*
2725 * 12 and 16 byte CDBs use different offsets to
2726 * provide the various register values.
2727 */
542b1444 2728 if (cdb[0] == ATA_16) {
b095518e
JG		 2729 /*
2730 * 16-byte CDB - may contain extended commands.
2731 *
2732 * If that is the case, copy the upper byte register values.
2733 */
542b1444
TH		 2734 if (cdb[1] & 0x01) {
2735 tf->hob_feature = cdb[3];
2736 tf->hob_nsect = cdb[5];
2737 tf->hob_lbal = cdb[7];
2738 tf->hob_lbam = cdb[9];
2739 tf->hob_lbah = cdb[11];
b095518e
JG		 2740 tf->flags |= ATA_TFLAG_LBA48;
2741 } else
2742 tf->flags &= ~ATA_TFLAG_LBA48;
2743
2744 /*
2745 * Always copy low byte, device and command registers.
2746 */
542b1444
TH		 2747 tf->feature = cdb[4];
2748 tf->nsect = cdb[6];
2749 tf->lbal = cdb[8];
2750 tf->lbam = cdb[10];
2751 tf->lbah = cdb[12];
2752 tf->device = cdb[13];
2753 tf->command = cdb[14];
b095518e
JG		 2754 } else {
2755 /*
2756 * 12-byte CDB - incapable of extended commands.
2757 */
2758 tf->flags &= ~ATA_TFLAG_LBA48;
2759
542b1444
TH		 2760 tf->feature = cdb[3];
2761 tf->nsect = cdb[4];
2762 tf->lbal = cdb[5];
2763 tf->lbam = cdb[6];
2764 tf->lbah = cdb[7];
2765 tf->device = cdb[8];
2766 tf->command = cdb[9];
b095518e 2767 }
fa4453c4
AL		 2768
2769 /* enforce correct master/slave bit */
2770 tf->device = dev->devno ?
2771 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
b095518e 2772
1dce589c
AL		 2773 /* sanity check for pio multi commands */
2774 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2775 goto invalid_fld;
2776
2777 if (is_multi_taskfile(tf)) {
2778 unsigned int multi_count = 1 << (cdb[1] >> 5);
2779
2780 /* compare the passed through multi_count
2781 * with the cached multi_count of libata
2782 */
2783 if (multi_count != dev->multi_count)
2784 ata_dev_printk(dev, KERN_WARNING,
2785 "invalid multi_count %u ignored\n",
2786 multi_count);
d26fc955 2787 }
1dce589c 2788
5a5dbd18
ML		 2789 /* READ/WRITE LONG use a non-standard sect_size */
2790 qc->sect_size = ATA_SECT_SIZE;
2791 switch (tf->command) {
2792 case ATA_CMD_READ_LONG:
2793 case ATA_CMD_READ_LONG_ONCE:
2794 case ATA_CMD_WRITE_LONG:
2795 case ATA_CMD_WRITE_LONG_ONCE:
2796 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2797 goto invalid_fld;
7120165c 2798 qc->sect_size = scsi_bufflen(scmd);
5a5dbd18
ML		 2799 }
2800
b095518e
JG		 2801 /*
2802 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2803 * SET_FEATURES - XFER MODE must be preceded/succeeded
2804 * by an update to hardware-specific registers for each
2805 * controller (i.e. the reason for ->set_piomode(),
2806 * ->set_dmamode(), and ->post_set_mode() hooks).
2807 */
2808 if ((tf->command == ATA_CMD_SET_FEATURES)
2809 && (tf->feature == SETFEATURES_XFER))
9a405257 2810 goto invalid_fld;
b095518e
JG		 2811
2812 /*
2813 * Set flags so that all registers will be written,
2814 * and pass on write indication (used for PIO/DMA
2815 * setup.)
2816 */
2817 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2818
542b1444 2819 if (scmd->sc_data_direction == DMA_TO_DEVICE)
b095518e
JG		 2820 tf->flags |= ATA_TFLAG_WRITE;
2821
2822 /*
2823 * Set transfer length.
2824 *
2825 * TODO: find out if we need to do more here to
2826 * cover scatter/gather case.
2827 */
7120165c 2828 qc->nbytes = scsi_bufflen(scmd);
b095518e 2829
e027bd36
TH		 2830 /* request result TF and be quiet about device error */
2831 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
e61e0672 2832
b095518e 2833 return 0;
9a405257
TH		 2834
2835 invalid_fld:
542b1444 2836 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
9a405257
TH		 2837 /* "Invalid field in cdb" */
2838 return 1;
b095518e
JG		 2839}
2840
1da177e4
LT		 2841/**
2842 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2843 * @dev: ATA device
2844 * @cmd: SCSI command opcode to consider
2845 *
2846 * Look up the SCSI command given, and determine whether the
2847 * SCSI command is to be translated or simulated.
2848 *
2849 * RETURNS:
2850 * Pointer to translation function if possible, %NULL if not.
2851 */
2852
2853static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2854{
2855 switch (cmd) {
2856 case READ_6:
2857 case READ_10:
2858 case READ_16:
2859
2860 case WRITE_6:
2861 case WRITE_10:
2862 case WRITE_16:
2863 return ata_scsi_rw_xlat;
2864
2865 case SYNCHRONIZE_CACHE:
2866 if (ata_try_flush_cache(dev))
2867 return ata_scsi_flush_xlat;
2868 break;
2869
2870 case VERIFY:
2871 case VERIFY_16:
2872 return ata_scsi_verify_xlat;
b095518e
JG		 2873
2874 case ATA_12:
2875 case ATA_16:
2876 return ata_scsi_pass_thru;
da61396d 2877
972dcafb
DG		 2878 case START_STOP:
2879 return ata_scsi_start_stop_xlat;
1da177e4
LT		 2880 }
2881
2882 return NULL;
2883}
2884
2885/**
2886 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2887 * @ap: ATA port to which the command was being sent
2888 * @cmd: SCSI command to dump
2889 *
2890 * Prints the contents of a SCSI command via printk().
2891 */
2892
2893static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2894 struct scsi_cmnd *cmd)
2895{
2896#ifdef ATA_DEBUG
2897 struct scsi_device *scsidev = cmd->device;
2898 u8 *scsicmd = cmd->cmnd;
2899
2900 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
44877b4e 2901 ap->print_id,
1da177e4
LT		 2902 scsidev->channel, scsidev->id, scsidev->lun,
2903 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2904 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2905 scsicmd[8]);
2906#endif
2907}
2908
542b1444 2909static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2115ea94
TH		 2910 void (*done)(struct scsi_cmnd *),
2911 struct ata_device *dev)
eb3f0f9c 2912{
baf4fdfa
ML		 2913 u8 scsi_op = scmd->cmnd[0];
2914 ata_xlat_func_t xlat_func;
2115ea94
TH		 2915 int rc = 0;
2916
eb3f0f9c 2917 if (dev->class == ATA_DEV_ATA) {
baf4fdfa
ML		 2918 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2919 goto bad_cdb_len;
eb3f0f9c 2920
baf4fdfa
ML		 2921 xlat_func = ata_get_xlat_func(dev, scsi_op);
2922 } else {
2923 if (unlikely(!scmd->cmd_len))
2924 goto bad_cdb_len;
2925
2926 xlat_func = NULL;
2927 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2928 /* relay SCSI command to ATAPI device */
607126c2
ML		 2929 int len = COMMAND_SIZE(scsi_op);
2930 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
baf4fdfa
ML		 2931 goto bad_cdb_len;
2932
2933 xlat_func = atapi_xlat;
2934 } else {
2935 /* ATA_16 passthru, treat as an ATA command */
2936 if (unlikely(scmd->cmd_len > 16))
2937 goto bad_cdb_len;
2938
2939 xlat_func = ata_get_xlat_func(dev, scsi_op);
2940 }
2941 }
2942
2943 if (xlat_func)
2944 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2945 else
2946 ata_scsi_simulate(dev, scmd, done);
2115ea94
TH		 2947
2948 return rc;
baf4fdfa
ML		 2949
2950 bad_cdb_len:
2951 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2952 scmd->cmd_len, scsi_op, dev->cdb_len);
2953 scmd->result = DID_ERROR << 16;
2954 done(scmd);
2955 return 0;
eb3f0f9c
BK		 2956}
2957
1da177e4
LT		 2958/**
2959 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2960 * @cmd: SCSI command to be sent
2961 * @done: Completion function, called when command is complete
2962 *
2963 * In some cases, this function translates SCSI commands into
2964 * ATA taskfiles, and queues the taskfiles to be sent to
2965 * hardware. In other cases, this function simulates a
2966 * SCSI device by evaluating and responding to certain
2967 * SCSI commands. This creates the overall effect of
2968 * ATA and ATAPI devices appearing as SCSI devices.
2969 *
2970 * LOCKING:
cca3974e 2971 * Releases scsi-layer-held lock, and obtains host lock.
1da177e4
LT		 2972 *
2973 * RETURNS:
2115ea94
TH		 2974 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2975 * 0 otherwise.
1da177e4 2976 */
1da177e4
LT		 2977int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2978{
2979 struct ata_port *ap;
2980 struct ata_device *dev;
2981 struct scsi_device *scsidev = cmd->device;
005a5a06 2982 struct Scsi_Host *shost = scsidev->host;
2115ea94 2983 int rc = 0;
1da177e4 2984
35bb94b1 2985 ap = ata_shost_to_port(shost);
005a5a06
JG		 2986
2987 spin_unlock(shost->host_lock);
ba6a1308 2988 spin_lock(ap->lock);
1da177e4
LT		 2989
2990 ata_scsi_dump_cdb(ap, cmd);
2991
2992 dev = ata_scsi_find_dev(ap, scsidev);
eb3f0f9c 2993 if (likely(dev))
2115ea94 2994 rc = __ata_scsi_queuecmd(cmd, done, dev);
eb3f0f9c 2995 else {
1da177e4
LT		 2996 cmd->result = (DID_BAD_TARGET << 16);
2997 done(cmd);
1da177e4
LT		 2998 }
2999
ba6a1308 3000 spin_unlock(ap->lock);
005a5a06 3001 spin_lock(shost->host_lock);
2115ea94 3002 return rc;
1da177e4
LT		 3003}
3004
3005/**
3006 * ata_scsi_simulate - simulate SCSI command on ATA device
c893a3ae 3007 * @dev: the target device
1da177e4
LT		 3008 * @cmd: SCSI command being sent to device.
3009 * @done: SCSI command completion function.
3010 *
3011 * Interprets and directly executes a select list of SCSI commands
3012 * that can be handled internally.
3013 *
3014 * LOCKING:
cca3974e 3015 * spin_lock_irqsave(host lock)
1da177e4
LT		 3016 */
3017
3373efd8 3018void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
1da177e4
LT		 3019 void (*done)(struct scsi_cmnd *))
3020{
3021 struct ata_scsi_args args;
057ace5e 3022 const u8 *scsicmd = cmd->cmnd;
45394145 3023 u8 tmp8;
1da177e4 3024
9a3dccc4
TH		 3025 args.dev = dev;
3026 args.id = dev->id;
1da177e4
LT		 3027 args.cmd = cmd;
3028 args.done = done;
3029
3030 switch(scsicmd[0]) {
2dcb407e
JG		 3031 /* TODO: worth improving? */
3032 case FORMAT_UNIT:
3033 ata_scsi_invalid_field(cmd, done);
3034 break;
3035
3036 case INQUIRY:
3037 if (scsicmd[1] & 2) /* is CmdDt set? */
00bd0202 3038 ata_scsi_invalid_field(cmd, done);
2dcb407e
JG		 3039 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3040 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3041 else switch (scsicmd[2]) {
3042 case 0x00:
3043 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1da177e4 3044 break;
2dcb407e
JG		 3045 case 0x80:
3046 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1da177e4 3047 break;
2dcb407e
JG		 3048 case 0x83:
3049 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1da177e4 3050 break;
2dcb407e
JG		 3051 case 0x89:
3052 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3053 break;
3054 default:
ae006510 3055 ata_scsi_invalid_field(cmd, done);
1da177e4 3056 break;
2dcb407e
JG		 3057 }
3058 break;
3059
3060 case MODE_SENSE:
3061 case MODE_SENSE_10:
3062 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3063 break;
3064
3065 case MODE_SELECT: /* unconditionally return */
3066 case MODE_SELECT_10: /* bad-field-in-cdb */
3067 ata_scsi_invalid_field(cmd, done);
3068 break;
1da177e4 3069
2dcb407e
JG		 3070 case READ_CAPACITY:
3071 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3072 break;
3073
3074 case SERVICE_ACTION_IN:
3075 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1da177e4 3076 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2dcb407e
JG		 3077 else
3078 ata_scsi_invalid_field(cmd, done);
3079 break;
1da177e4 3080
2dcb407e
JG		 3081 case REPORT_LUNS:
3082 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3083 break;
1da177e4 3084
2dcb407e
JG		 3085 case REQUEST_SENSE:
3086 ata_scsi_set_sense(cmd, 0, 0, 0);
3087 cmd->result = (DRIVER_SENSE << 24);
3088 done(cmd);
3089 break;
1da177e4 3090
2dcb407e
JG		 3091 /* if we reach this, then writeback caching is disabled,
3092 * turning this into a no-op.
3093 */
3094 case SYNCHRONIZE_CACHE:
3095 /* fall through */
3096
3097 /* no-op's, complete with success */
3098 case REZERO_UNIT:
3099 case SEEK_6:
3100 case SEEK_10:
3101 case TEST_UNIT_READY:
3102 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3103 break;
45394145 3104
2dcb407e
JG		 3105 case SEND_DIAGNOSTIC:
3106 tmp8 = scsicmd[1] & ~(1 << 3);
3107 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
00bd0202 3108 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2dcb407e
JG		 3109 else
3110 ata_scsi_invalid_field(cmd, done);
3111 break;
1da177e4 3112
2dcb407e
JG		 3113 /* all other commands */
3114 default:
3115 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3116 /* "Invalid command operation code" */
3117 done(cmd);
3118 break;
1da177e4
LT		 3119 }
3120}
3121
f3187195
TH		 3122int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3123{
3124 int i, rc;
3125
3126 for (i = 0; i < host->n_ports; i++) {
3127 struct ata_port *ap = host->ports[i];
3128 struct Scsi_Host *shost;
3129
3130 rc = -ENOMEM;
3131 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3132 if (!shost)
3133 goto err_alloc;
3134
3135 *(struct ata_port **)&shost->hostdata[0] = ap;
3136 ap->scsi_host = shost;
3137
3138 shost->transportt = &ata_scsi_transport_template;
3139 shost->unique_id = ap->print_id;
3140 shost->max_id = 16;
3141 shost->max_lun = 1;
3142 shost->max_channel = 1;
3143 shost->max_cmd_len = 16;
3144
31cc23b3
TH		 3145 /* Schedule policy is determined by ->qc_defer()
3146 * callback and it needs to see every deferred qc.
3147 * Set host_blocked to 1 to prevent SCSI midlayer from
3148 * automatically deferring requests.
3149 */
3150 shost->max_host_blocked = 1;
3151
f3187195
TH		 3152 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3153 if (rc)
3154 goto err_add;
3155 }
3156
3157 return 0;
3158
3159 err_add:
3160 scsi_host_put(host->ports[i]->scsi_host);
3161 err_alloc:
3162 while (--i >= 0) {
3163 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3164
3165 scsi_remove_host(shost);
3166 scsi_host_put(shost);
3167 }
3168 return rc;
3169}
3170
1ae46317 3171void ata_scsi_scan_host(struct ata_port *ap, int sync)
644dd0cc 3172{
1ae46317
TH		 3173 int tries = 5;
3174 struct ata_device *last_failed_dev = NULL;
41bda9c9 3175 struct ata_link *link;
1ae46317 3176 struct ata_device *dev;
644dd0cc 3177
198e0fed 3178 if (ap->flags & ATA_FLAG_DISABLED)
644dd0cc
JG		 3179 return;
3180
1ae46317 3181 repeat:
41bda9c9
TH		 3182 ata_port_for_each_link(link, ap) {
3183 ata_link_for_each_dev(dev, link) {
3184 struct scsi_device *sdev;
3185 int channel = 0, id = 0;
3edebac4 3186
41bda9c9
TH		 3187 if (!ata_dev_enabled(dev) || dev->sdev)
3188 continue;
3f19ee8c 3189
41bda9c9
TH		 3190 if (ata_is_host_link(link))
3191 id = dev->devno;
3192 else
3193 channel = link->pmp;
3194
3195 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3196 NULL);
3197 if (!IS_ERR(sdev)) {
3198 dev->sdev = sdev;
3199 scsi_device_put(sdev);
3200 }
3edebac4 3201 }
3f19ee8c 3202 }
1ae46317
TH		 3203
3204 /* If we scanned while EH was in progress or allocation
3205 * failure occurred, scan would have failed silently. Check
3206 * whether all devices are attached.
3207 */
41bda9c9
TH		 3208 ata_port_for_each_link(link, ap) {
3209 ata_link_for_each_dev(dev, link) {
3210 if (ata_dev_enabled(dev) && !dev->sdev)
3211 goto exit_loop;
3212 }
1ae46317 3213 }
41bda9c9
TH		 3214 exit_loop:
3215 if (!link)
1ae46317
TH		 3216 return;
3217
3218 /* we're missing some SCSI devices */
3219 if (sync) {
3220 /* If caller requested synchrnous scan && we've made
3221 * any progress, sleep briefly and repeat.
3222 */
3223 if (dev != last_failed_dev) {
3224 msleep(100);
3225 last_failed_dev = dev;
3226 goto repeat;
3227 }
3228
3229 /* We might be failing to detect boot device, give it
3230 * a few more chances.
3231 */
3232 if (--tries) {
3233 msleep(100);
3234 goto repeat;
3235 }
3236
3237 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3238 "failed without making any progress,\n"
3239 " switching to async\n");
3240 }
3241
3242 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3243 round_jiffies_relative(HZ));
644dd0cc 3244}
0ea035a3
TH		 3245
3246/**
3247 * ata_scsi_offline_dev - offline attached SCSI device
3248 * @dev: ATA device to offline attached SCSI device for
3249 *
3250 * This function is called from ata_eh_hotplug() and responsible
3251 * for taking the SCSI device attached to @dev offline. This
cca3974e 3252 * function is called with host lock which protects dev->sdev
0ea035a3
TH		 3253 * against clearing.
3254 *
3255 * LOCKING:
cca3974e 3256 * spin_lock_irqsave(host lock)
0ea035a3
TH		 3257 *
3258 * RETURNS:
3259 * 1 if attached SCSI device exists, 0 otherwise.
3260 */
3261int ata_scsi_offline_dev(struct ata_device *dev)
3262{
3263 if (dev->sdev) {
3264 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3265 return 1;
3266 }
3267 return 0;
3268}
580b2102
TH		 3269
3270/**
3271 * ata_scsi_remove_dev - remove attached SCSI device
3272 * @dev: ATA device to remove attached SCSI device for
3273 *
3274 * This function is called from ata_eh_scsi_hotplug() and
3275 * responsible for removing the SCSI device attached to @dev.
3276 *
3277 * LOCKING:
3278 * Kernel thread context (may sleep).
3279 */
3280static void ata_scsi_remove_dev(struct ata_device *dev)
3281{
9af5c9c9 3282 struct ata_port *ap = dev->link->ap;
580b2102
TH		 3283 struct scsi_device *sdev;
3284 unsigned long flags;
3285
3286 /* Alas, we need to grab scan_mutex to ensure SCSI device
3287 * state doesn't change underneath us and thus
3288 * scsi_device_get() always succeeds. The mutex locking can
3289 * be removed if there is __scsi_device_get() interface which
3290 * increments reference counts regardless of device state.
3291 */
cca3974e 3292 mutex_lock(&ap->scsi_host->scan_mutex);
ba6a1308 3293 spin_lock_irqsave(ap->lock, flags);
580b2102 3294
cca3974e 3295 /* clearing dev->sdev is protected by host lock */
580b2102
TH		 3296 sdev = dev->sdev;
3297 dev->sdev = NULL;
3298
3299 if (sdev) {
3300 /* If user initiated unplug races with us, sdev can go
cca3974e 3301 * away underneath us after the host lock and
580b2102
TH		 3302 * scan_mutex are released. Hold onto it.
3303 */
3304 if (scsi_device_get(sdev) == 0) {
3305 /* The following ensures the attached sdev is
3306 * offline on return from ata_scsi_offline_dev()
3307 * regardless it wins or loses the race
3308 * against this function.
3309 */
3310 scsi_device_set_state(sdev, SDEV_OFFLINE);
3311 } else {
3312 WARN_ON(1);
3313 sdev = NULL;
3314 }
3315 }
3316
ba6a1308 3317 spin_unlock_irqrestore(ap->lock, flags);
cca3974e 3318 mutex_unlock(&ap->scsi_host->scan_mutex);
580b2102
TH		 3319
3320 if (sdev) {
3321 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3322 sdev->sdev_gendev.bus_id);
3323
3324 scsi_remove_device(sdev);
3325 scsi_device_put(sdev);
3326 }
3327}
3328
41bda9c9
TH		 3329static void ata_scsi_handle_link_detach(struct ata_link *link)
3330{
3331 struct ata_port *ap = link->ap;
3332 struct ata_device *dev;
3333
3334 ata_link_for_each_dev(dev, link) {
3335 unsigned long flags;
3336
3337 if (!(dev->flags & ATA_DFLAG_DETACHED))
3338 continue;
3339
3340 spin_lock_irqsave(ap->lock, flags);
3341 dev->flags &= ~ATA_DFLAG_DETACHED;
3342 spin_unlock_irqrestore(ap->lock, flags);
3343
3344 ata_scsi_remove_dev(dev);
3345 }
3346}
3347
2f294968
KCA		 3348/**
3349 * ata_scsi_media_change_notify - send media change event
c5d0e6a0 3350 * @dev: Pointer to the disk device with media change event
2f294968
KCA		 3351 *
3352 * Tell the block layer to send a media change notification
3353 * event.
3354 *
3355 * LOCKING:
854c73a2 3356 * spin_lock_irqsave(host lock)
2f294968 3357 */
854c73a2 3358void ata_scsi_media_change_notify(struct ata_device *dev)
2f294968 3359{
854c73a2 3360 if (dev->sdev)
f26792d5
JG		 3361 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3362 GFP_ATOMIC);
2f294968 3363}
2f294968 3364
580b2102
TH		 3365/**
3366 * ata_scsi_hotplug - SCSI part of hotplug
65f27f38 3367 * @work: Pointer to ATA port to perform SCSI hotplug on
580b2102
TH		 3368 *
3369 * Perform SCSI part of hotplug. It's executed from a separate
3370 * workqueue after EH completes. This is necessary because SCSI
3371 * hot plugging requires working EH and hot unplugging is
3372 * synchronized with hot plugging with a mutex.
3373 *
3374 * LOCKING:
3375 * Kernel thread context (may sleep).
3376 */
65f27f38 3377void ata_scsi_hotplug(struct work_struct *work)
580b2102 3378{
65f27f38
DH		 3379 struct ata_port *ap =
3380 container_of(work, struct ata_port, hotplug_task.work);
41bda9c9 3381 int i;
580b2102 3382
b51e9e5d 3383 if (ap->pflags & ATA_PFLAG_UNLOADING) {
580b2102
TH		 3384 DPRINTK("ENTER/EXIT - unloading\n");
3385 return;
3386 }
3387
3388 DPRINTK("ENTER\n");
3389
41bda9c9
TH		 3390 /* Unplug detached devices. We cannot use link iterator here
3391 * because PMP links have to be scanned even if PMP is
3392 * currently not attached. Iterate manually.
3393 */
3394 ata_scsi_handle_link_detach(&ap->link);
3395 if (ap->pmp_link)
3396 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3397 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
580b2102
TH		 3398
3399 /* scan for new ones */
1ae46317 3400 ata_scsi_scan_host(ap, 0);
580b2102
TH		 3401
3402 DPRINTK("EXIT\n");
3403}
83c47bcb
TH		 3404
3405/**
3406 * ata_scsi_user_scan - indication for user-initiated bus scan
3407 * @shost: SCSI host to scan
3408 * @channel: Channel to scan
3409 * @id: ID to scan
3410 * @lun: LUN to scan
3411 *
3412 * This function is called when user explicitly requests bus
3413 * scan. Set probe pending flag and invoke EH.
3414 *
3415 * LOCKING:
3416 * SCSI layer (we don't care)
3417 *
3418 * RETURNS:
3419 * Zero.
3420 */
3421static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3422 unsigned int id, unsigned int lun)
3423{
3424 struct ata_port *ap = ata_shost_to_port(shost);
3425 unsigned long flags;
41bda9c9 3426 int devno, rc = 0;
83c47bcb
TH		 3427
3428 if (!ap->ops->error_handler)
3429 return -EOPNOTSUPP;
3430
41bda9c9 3431 if (lun != SCAN_WILD_CARD && lun)
83c47bcb
TH		 3432 return -EINVAL;
3433
41bda9c9
TH		 3434 if (ap->nr_pmp_links == 0) {
3435 if (channel != SCAN_WILD_CARD && channel)
3436 return -EINVAL;
3437 devno = id;
3438 } else {
3439 if (id != SCAN_WILD_CARD && id)
3440 return -EINVAL;
3441 devno = channel;
3442 }
3443
ba6a1308 3444 spin_lock_irqsave(ap->lock, flags);
83c47bcb 3445
41bda9c9
TH		 3446 if (devno == SCAN_WILD_CARD) {
3447 struct ata_link *link;
3448
3449 ata_port_for_each_link(link, ap) {
3450 struct ata_eh_info *ehi = &link->eh_info;
3451 ehi->probe_mask |= (1 << ata_link_max_devices(link)) - 1;
3452 ehi->action |= ATA_EH_SOFTRESET;
3453 }
83c47bcb 3454 } else {
41bda9c9 3455 struct ata_device *dev = ata_find_dev(ap, devno);
83c47bcb
TH		 3456
3457 if (dev) {
41bda9c9 3458 struct ata_eh_info *ehi = &dev->link->eh_info;
9af5c9c9
TH		 3459 ehi->probe_mask |= 1 << dev->devno;
3460 ehi->action |= ATA_EH_SOFTRESET;
3461 ehi->flags |= ATA_EHI_RESUME_LINK;
83c47bcb
TH		 3462 } else
3463 rc = -EINVAL;
3464 }
3465
309afcb5 3466 if (rc == 0) {
83c47bcb 3467 ata_port_schedule_eh(ap);
309afcb5
TH		 3468 spin_unlock_irqrestore(ap->lock, flags);
3469 ata_port_wait_eh(ap);
3470 } else
3471 spin_unlock_irqrestore(ap->lock, flags);
83c47bcb
TH		 3472
3473 return rc;
3474}
3057ac3c 3475
3476/**
d0171269 3477 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
65f27f38 3478 * @work: Pointer to ATA port to perform scsi_rescan_device()
3057ac3c 3479 *
d0171269
TH		 3480 * After ATA pass thru (SAT) commands are executed successfully,
3481 * libata need to propagate the changes to SCSI layer. This
3482 * function must be executed from ata_aux_wq such that sdev
3483 * attach/detach don't race with rescan.
3057ac3c 3484 *
d0171269
TH		 3485 * LOCKING:
3486 * Kernel thread context (may sleep).
3057ac3c 3487 */
65f27f38 3488void ata_scsi_dev_rescan(struct work_struct *work)
3057ac3c 3489{
65f27f38
DH		 3490 struct ata_port *ap =
3491 container_of(work, struct ata_port, scsi_rescan_task);
41bda9c9 3492 struct ata_link *link;
f58229f8 3493 struct ata_device *dev;
f84e7e41 3494 unsigned long flags;
3057ac3c 3495
f84e7e41
TH		 3496 spin_lock_irqsave(ap->lock, flags);
3497
41bda9c9
TH		 3498 ata_port_for_each_link(link, ap) {
3499 ata_link_for_each_dev(dev, link) {
3500 struct scsi_device *sdev = dev->sdev;
3057ac3c 3501
41bda9c9
TH		 3502 if (!ata_dev_enabled(dev) || !sdev)
3503 continue;
3504 if (scsi_device_get(sdev))
3505 continue;
f84e7e41 3506
41bda9c9
TH		 3507 spin_unlock_irqrestore(ap->lock, flags);
3508 scsi_rescan_device(&(sdev->sdev_gendev));
3509 scsi_device_put(sdev);
3510 spin_lock_irqsave(ap->lock, flags);
3511 }
3057ac3c 3512 }
f84e7e41
TH		 3513
3514 spin_unlock_irqrestore(ap->lock, flags);
3057ac3c 3515}
80289167
BK		 3516
3517/**
3518 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4f931374 3519 * @host: ATA host container for all SAS ports
80289167 3520 * @port_info: Information from low-level host driver
cca3974e 3521 * @shost: SCSI host that the scsi device is attached to
80289167
BK		 3522 *
3523 * LOCKING:
3524 * PCI/etc. bus probe sem.
3525 *
3526 * RETURNS:
3527 * ata_port pointer on success / NULL on failure.
3528 */
3529
cca3974e 3530struct ata_port *ata_sas_port_alloc(struct ata_host *host,
80289167 3531 struct ata_port_info *port_info,
cca3974e 3532 struct Scsi_Host *shost)
80289167 3533{
f3187195 3534 struct ata_port *ap;
80289167 3535
f3187195 3536 ap = ata_port_alloc(host);
80289167
BK		 3537 if (!ap)
3538 return NULL;
3539
f3187195 3540 ap->port_no = 0;
cca3974e 3541 ap->lock = shost->host_lock;
f3187195
TH		 3542 ap->pio_mask = port_info->pio_mask;
3543 ap->mwdma_mask = port_info->mwdma_mask;
3544 ap->udma_mask = port_info->udma_mask;
3545 ap->flags |= port_info->flags;
3546 ap->ops = port_info->port_ops;
3547 ap->cbl = ATA_CBL_SATA;
3548
80289167
BK		 3549 return ap;
3550}
3551EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3552
3553/**
3554 * ata_sas_port_start - Set port up for dma.
3555 * @ap: Port to initialize
3556 *
3557 * Called just after data structures for each port are
3558 * initialized. Allocates DMA pad.
3559 *
3560 * May be used as the port_start() entry in ata_port_operations.
3561 *
3562 * LOCKING:
3563 * Inherited from caller.
3564 */
3565int ata_sas_port_start(struct ata_port *ap)
3566{
3567 return ata_pad_alloc(ap, ap->dev);
3568}
3569EXPORT_SYMBOL_GPL(ata_sas_port_start);
3570
3571/**
3572 * ata_port_stop - Undo ata_sas_port_start()
3573 * @ap: Port to shut down
3574 *
3575 * Frees the DMA pad.
3576 *
3577 * May be used as the port_stop() entry in ata_port_operations.
3578 *
3579 * LOCKING:
3580 * Inherited from caller.
3581 */
3582
3583void ata_sas_port_stop(struct ata_port *ap)
3584{
3585 ata_pad_free(ap, ap->dev);
3586}
3587EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3588
3589/**
3590 * ata_sas_port_init - Initialize a SATA device
3591 * @ap: SATA port to initialize
3592 *
3593 * LOCKING:
3594 * PCI/etc. bus probe sem.
3595 *
3596 * RETURNS:
3597 * Zero on success, non-zero on error.
3598 */
3599
3600int ata_sas_port_init(struct ata_port *ap)
3601{
3602 int rc = ap->ops->port_start(ap);
3603
f3187195
TH		 3604 if (!rc) {
3605 ap->print_id = ata_print_id++;
80289167 3606 rc = ata_bus_probe(ap);
f3187195 3607 }
80289167
BK		 3608
3609 return rc;
3610}
3611EXPORT_SYMBOL_GPL(ata_sas_port_init);
3612
3613/**
3614 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3615 * @ap: SATA port to destroy
3616 *
3617 */
3618
3619void ata_sas_port_destroy(struct ata_port *ap)
3620{
f0d36efd
TH		 3621 if (ap->ops->port_stop)
3622 ap->ops->port_stop(ap);
80289167
BK		 3623 kfree(ap);
3624}
3625EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3626
3627/**
3628 * ata_sas_slave_configure - Default slave_config routine for libata devices
3629 * @sdev: SCSI device to configure
3630 * @ap: ATA port to which SCSI device is attached
3631 *
3632 * RETURNS:
3633 * Zero.
3634 */
3635
3636int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3637{
3638 ata_scsi_sdev_config(sdev);
9af5c9c9 3639 ata_scsi_dev_config(sdev, ap->link.device);
80289167
BK		 3640 return 0;
3641}
3642EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3643
3644/**
3645 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3646 * @cmd: SCSI command to be sent
3647 * @done: Completion function, called when command is complete
3648 * @ap: ATA port to which the command is being sent
3649 *
3650 * RETURNS:
08475a19
BK		 3651 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3652 * 0 otherwise.
80289167
BK		 3653 */
3654
3655int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3656 struct ata_port *ap)
3657{
08475a19
BK		 3658 int rc = 0;
3659
80289167
BK		 3660 ata_scsi_dump_cdb(ap, cmd);
3661
9af5c9c9
TH		 3662 if (likely(ata_scsi_dev_enabled(ap->link.device)))
3663 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
80289167
BK		 3664 else {
3665 cmd->result = (DID_BAD_TARGET << 16);
3666 done(cmd);
3667 }
08475a19 3668 return rc;
80289167
BK		 3669}
3670EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
Linux kernel - Deliverables
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