Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * The low performance USB storage driver (ub). | |
3 | * | |
4 | * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
5 | * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com) | |
6 | * | |
7 | * This work is a part of Linux kernel, is derived from it, | |
8 | * and is not licensed separately. See file COPYING for details. | |
9 | * | |
10 | * TODO (sorted by decreasing priority) | |
f4800078 | 11 | * -- Kill first_open (Al Viro fixed the block layer now) |
1da177e4 LT |
12 | * -- set readonly flag for CDs, set removable flag for CF readers |
13 | * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch) | |
1da177e4 LT |
14 | * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries |
15 | * -- verify the 13 conditions and do bulk resets | |
1da177e4 | 16 | * -- kill last_pipe and simply do two-state clearing on both pipes |
ba6abf13 | 17 | * -- highmem |
1da177e4 LT |
18 | * -- move top_sense and work_bcs into separate allocations (if they survive) |
19 | * for cache purists and esoteric architectures. | |
ba6abf13 | 20 | * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ? |
1da177e4 LT |
21 | * -- prune comments, they are too volumnous |
22 | * -- Exterminate P3 printks | |
23 | * -- Resove XXX's | |
24 | * -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=? | |
1872bceb | 25 | * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. |
1da177e4 LT |
26 | */ |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/usb.h> | |
a00828e9 | 30 | #include <linux/usb_usual.h> |
1da177e4 LT |
31 | #include <linux/blkdev.h> |
32 | #include <linux/devfs_fs_kernel.h> | |
33 | #include <linux/timer.h> | |
34 | #include <scsi/scsi.h> | |
35 | ||
36 | #define DRV_NAME "ub" | |
37 | #define DEVFS_NAME DRV_NAME | |
38 | ||
39 | #define UB_MAJOR 180 | |
40 | ||
1872bceb PZ |
41 | /* |
42 | * The command state machine is the key model for understanding of this driver. | |
43 | * | |
44 | * The general rule is that all transitions are done towards the bottom | |
45 | * of the diagram, thus preventing any loops. | |
46 | * | |
47 | * An exception to that is how the STAT state is handled. A counter allows it | |
48 | * to be re-entered along the path marked with [C]. | |
49 | * | |
50 | * +--------+ | |
51 | * ! INIT ! | |
52 | * +--------+ | |
53 | * ! | |
54 | * ub_scsi_cmd_start fails ->--------------------------------------\ | |
55 | * ! ! | |
56 | * V ! | |
57 | * +--------+ ! | |
58 | * ! CMD ! ! | |
59 | * +--------+ ! | |
60 | * ! +--------+ ! | |
61 | * was -EPIPE -->-------------------------------->! CLEAR ! ! | |
62 | * ! +--------+ ! | |
63 | * ! ! ! | |
64 | * was error -->------------------------------------- ! --------->\ | |
65 | * ! ! ! | |
66 | * /--<-- cmd->dir == NONE ? ! ! | |
67 | * ! ! ! ! | |
68 | * ! V ! ! | |
69 | * ! +--------+ ! ! | |
70 | * ! ! DATA ! ! ! | |
71 | * ! +--------+ ! ! | |
72 | * ! ! +---------+ ! ! | |
73 | * ! was -EPIPE -->--------------->! CLR2STS ! ! ! | |
74 | * ! ! +---------+ ! ! | |
75 | * ! ! ! ! ! | |
76 | * ! ! was error -->---- ! --------->\ | |
77 | * ! was error -->--------------------- ! ------------- ! --------->\ | |
78 | * ! ! ! ! ! | |
79 | * ! V ! ! ! | |
80 | * \--->+--------+ ! ! ! | |
81 | * ! STAT !<--------------------------/ ! ! | |
82 | * /--->+--------+ ! ! | |
83 | * ! ! ! ! | |
84 | * [C] was -EPIPE -->-----------\ ! ! | |
85 | * ! ! ! ! ! | |
86 | * +<---- len == 0 ! ! ! | |
87 | * ! ! ! ! ! | |
88 | * ! was error -->--------------------------------------!---------->\ | |
89 | * ! ! ! ! ! | |
90 | * +<---- bad CSW ! ! ! | |
91 | * +<---- bad tag ! ! ! | |
92 | * ! ! V ! ! | |
93 | * ! ! +--------+ ! ! | |
94 | * ! ! ! CLRRS ! ! ! | |
95 | * ! ! +--------+ ! ! | |
96 | * ! ! ! ! ! | |
97 | * \------- ! --------------------[C]--------\ ! ! | |
98 | * ! ! ! ! | |
99 | * cmd->error---\ +--------+ ! ! | |
100 | * ! +--------------->! SENSE !<----------/ ! | |
101 | * STAT_FAIL----/ +--------+ ! | |
102 | * ! ! V | |
103 | * ! V +--------+ | |
104 | * \--------------------------------\--------------------->! DONE ! | |
105 | * +--------+ | |
106 | */ | |
107 | ||
1da177e4 | 108 | /* |
f4800078 PZ |
109 | * This many LUNs per USB device. |
110 | * Every one of them takes a host, see UB_MAX_HOSTS. | |
1da177e4 | 111 | */ |
9f793d2c | 112 | #define UB_MAX_LUNS 9 |
f4800078 PZ |
113 | |
114 | /* | |
115 | */ | |
116 | ||
4fb729f5 | 117 | #define UB_PARTS_PER_LUN 8 |
1da177e4 LT |
118 | |
119 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ | |
120 | ||
121 | #define UB_SENSE_SIZE 18 | |
122 | ||
123 | /* | |
124 | */ | |
125 | ||
126 | /* command block wrapper */ | |
127 | struct bulk_cb_wrap { | |
128 | __le32 Signature; /* contains 'USBC' */ | |
129 | u32 Tag; /* unique per command id */ | |
130 | __le32 DataTransferLength; /* size of data */ | |
131 | u8 Flags; /* direction in bit 0 */ | |
f4800078 | 132 | u8 Lun; /* LUN */ |
1da177e4 LT |
133 | u8 Length; /* of of the CDB */ |
134 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ | |
135 | }; | |
136 | ||
137 | #define US_BULK_CB_WRAP_LEN 31 | |
138 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ | |
139 | #define US_BULK_FLAG_IN 1 | |
140 | #define US_BULK_FLAG_OUT 0 | |
141 | ||
142 | /* command status wrapper */ | |
143 | struct bulk_cs_wrap { | |
144 | __le32 Signature; /* should = 'USBS' */ | |
145 | u32 Tag; /* same as original command */ | |
146 | __le32 Residue; /* amount not transferred */ | |
147 | u8 Status; /* see below */ | |
148 | }; | |
149 | ||
150 | #define US_BULK_CS_WRAP_LEN 13 | |
151 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ | |
1da177e4 LT |
152 | #define US_BULK_STAT_OK 0 |
153 | #define US_BULK_STAT_FAIL 1 | |
154 | #define US_BULK_STAT_PHASE 2 | |
155 | ||
156 | /* bulk-only class specific requests */ | |
157 | #define US_BULK_RESET_REQUEST 0xff | |
158 | #define US_BULK_GET_MAX_LUN 0xfe | |
159 | ||
160 | /* | |
161 | */ | |
162 | struct ub_dev; | |
163 | ||
64bd8453 | 164 | #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */ |
1da177e4 LT |
165 | #define UB_MAX_SECTORS 64 |
166 | ||
167 | /* | |
168 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) | |
169 | * even if a webcam hogs the bus, but some devices need time to spin up. | |
170 | */ | |
171 | #define UB_URB_TIMEOUT (HZ*2) | |
172 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ | |
173 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ | |
174 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ | |
175 | ||
176 | /* | |
177 | * An instance of a SCSI command in transit. | |
178 | */ | |
179 | #define UB_DIR_NONE 0 | |
180 | #define UB_DIR_READ 1 | |
181 | #define UB_DIR_ILLEGAL2 2 | |
182 | #define UB_DIR_WRITE 3 | |
183 | ||
184 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ | |
185 | (((c)==UB_DIR_READ)? 'r': 'n')) | |
186 | ||
187 | enum ub_scsi_cmd_state { | |
188 | UB_CMDST_INIT, /* Initial state */ | |
189 | UB_CMDST_CMD, /* Command submitted */ | |
190 | UB_CMDST_DATA, /* Data phase */ | |
191 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ | |
192 | UB_CMDST_STAT, /* Status phase */ | |
193 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ | |
1872bceb | 194 | UB_CMDST_CLRRS, /* Clearing before retrying status */ |
1da177e4 LT |
195 | UB_CMDST_SENSE, /* Sending Request Sense */ |
196 | UB_CMDST_DONE /* Final state */ | |
197 | }; | |
198 | ||
199 | static char *ub_scsi_cmd_stname[] = { | |
200 | ". ", | |
201 | "Cmd", | |
202 | "dat", | |
203 | "c2s", | |
204 | "sts", | |
205 | "clr", | |
1872bceb | 206 | "crs", |
1da177e4 LT |
207 | "Sen", |
208 | "fin" | |
209 | }; | |
210 | ||
211 | struct ub_scsi_cmd { | |
212 | unsigned char cdb[UB_MAX_CDB_SIZE]; | |
213 | unsigned char cdb_len; | |
214 | ||
215 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ | |
216 | unsigned char trace_index; | |
217 | enum ub_scsi_cmd_state state; | |
218 | unsigned int tag; | |
219 | struct ub_scsi_cmd *next; | |
220 | ||
221 | int error; /* Return code - valid upon done */ | |
222 | unsigned int act_len; /* Return size */ | |
223 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ | |
224 | ||
225 | int stat_count; /* Retries getting status. */ | |
226 | ||
1da177e4 | 227 | unsigned int len; /* Requested length */ |
a1cf96ef PZ |
228 | unsigned int current_sg; |
229 | unsigned int nsg; /* sgv[nsg] */ | |
230 | struct scatterlist sgv[UB_MAX_REQ_SG]; | |
1da177e4 | 231 | |
f4800078 | 232 | struct ub_lun *lun; |
1da177e4 LT |
233 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); |
234 | void *back; | |
235 | }; | |
236 | ||
2c26c9e6 PZ |
237 | struct ub_request { |
238 | struct request *rq; | |
239 | unsigned int current_try; | |
240 | unsigned int nsg; /* sgv[nsg] */ | |
241 | struct scatterlist sgv[UB_MAX_REQ_SG]; | |
242 | }; | |
243 | ||
1da177e4 LT |
244 | /* |
245 | */ | |
246 | struct ub_capacity { | |
247 | unsigned long nsec; /* Linux size - 512 byte sectors */ | |
248 | unsigned int bsize; /* Linux hardsect_size */ | |
249 | unsigned int bshift; /* Shift between 512 and hard sects */ | |
250 | }; | |
251 | ||
252 | /* | |
253 | * The SCSI command tracing structure. | |
254 | */ | |
255 | ||
256 | #define SCMD_ST_HIST_SZ 8 | |
257 | #define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */ | |
258 | ||
259 | struct ub_scsi_cmd_trace { | |
260 | int hcur; | |
261 | unsigned int tag; | |
262 | unsigned int req_size, act_size; | |
263 | unsigned char op; | |
264 | unsigned char dir; | |
265 | unsigned char key, asc, ascq; | |
266 | char st_hst[SCMD_ST_HIST_SZ]; | |
267 | }; | |
268 | ||
269 | struct ub_scsi_trace { | |
270 | int cur; | |
271 | struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ]; | |
272 | }; | |
273 | ||
274 | /* | |
275 | * This is a direct take-off from linux/include/completion.h | |
276 | * The difference is that I do not wait on this thing, just poll. | |
277 | * When I want to wait (ub_probe), I just use the stock completion. | |
278 | * | |
279 | * Note that INIT_COMPLETION takes no lock. It is correct. But why | |
280 | * in the bloody hell that thing takes struct instead of pointer to struct | |
281 | * is quite beyond me. I just copied it from the stock completion. | |
282 | */ | |
283 | struct ub_completion { | |
284 | unsigned int done; | |
285 | spinlock_t lock; | |
286 | }; | |
287 | ||
288 | static inline void ub_init_completion(struct ub_completion *x) | |
289 | { | |
290 | x->done = 0; | |
291 | spin_lock_init(&x->lock); | |
292 | } | |
293 | ||
294 | #define UB_INIT_COMPLETION(x) ((x).done = 0) | |
295 | ||
296 | static void ub_complete(struct ub_completion *x) | |
297 | { | |
298 | unsigned long flags; | |
299 | ||
300 | spin_lock_irqsave(&x->lock, flags); | |
301 | x->done++; | |
302 | spin_unlock_irqrestore(&x->lock, flags); | |
303 | } | |
304 | ||
305 | static int ub_is_completed(struct ub_completion *x) | |
306 | { | |
307 | unsigned long flags; | |
308 | int ret; | |
309 | ||
310 | spin_lock_irqsave(&x->lock, flags); | |
311 | ret = x->done; | |
312 | spin_unlock_irqrestore(&x->lock, flags); | |
313 | return ret; | |
314 | } | |
315 | ||
316 | /* | |
317 | */ | |
318 | struct ub_scsi_cmd_queue { | |
319 | int qlen, qmax; | |
320 | struct ub_scsi_cmd *head, *tail; | |
321 | }; | |
322 | ||
323 | /* | |
f4800078 PZ |
324 | * The block device instance (one per LUN). |
325 | */ | |
326 | struct ub_lun { | |
327 | struct ub_dev *udev; | |
328 | struct list_head link; | |
329 | struct gendisk *disk; | |
330 | int id; /* Host index */ | |
331 | int num; /* LUN number */ | |
332 | char name[16]; | |
333 | ||
334 | int changed; /* Media was changed */ | |
335 | int removable; | |
336 | int readonly; | |
337 | int first_open; /* Kludge. See ub_bd_open. */ | |
338 | ||
2c26c9e6 PZ |
339 | struct ub_request urq; |
340 | ||
f4800078 PZ |
341 | /* Use Ingo's mempool if or when we have more than one command. */ |
342 | /* | |
343 | * Currently we never need more than one command for the whole device. | |
344 | * However, giving every LUN a command is a cheap and automatic way | |
345 | * to enforce fairness between them. | |
346 | */ | |
347 | int cmda[1]; | |
348 | struct ub_scsi_cmd cmdv[1]; | |
349 | ||
350 | struct ub_capacity capacity; | |
351 | }; | |
352 | ||
353 | /* | |
354 | * The USB device instance. | |
1da177e4 LT |
355 | */ |
356 | struct ub_dev { | |
65b4fe55 | 357 | spinlock_t *lock; |
1da177e4 LT |
358 | atomic_t poison; /* The USB device is disconnected */ |
359 | int openc; /* protected by ub_lock! */ | |
360 | /* kref is too implicit for our taste */ | |
2c26c9e6 | 361 | int reset; /* Reset is running */ |
1da177e4 | 362 | unsigned int tagcnt; |
f4800078 | 363 | char name[12]; |
1da177e4 LT |
364 | struct usb_device *dev; |
365 | struct usb_interface *intf; | |
366 | ||
f4800078 | 367 | struct list_head luns; |
1da177e4 LT |
368 | |
369 | unsigned int send_bulk_pipe; /* cached pipe values */ | |
370 | unsigned int recv_bulk_pipe; | |
371 | unsigned int send_ctrl_pipe; | |
372 | unsigned int recv_ctrl_pipe; | |
373 | ||
374 | struct tasklet_struct tasklet; | |
375 | ||
1da177e4 LT |
376 | struct ub_scsi_cmd_queue cmd_queue; |
377 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ | |
378 | unsigned char top_sense[UB_SENSE_SIZE]; | |
379 | ||
380 | struct ub_completion work_done; | |
381 | struct urb work_urb; | |
382 | struct timer_list work_timer; | |
383 | int last_pipe; /* What might need clearing */ | |
1872bceb | 384 | __le32 signature; /* Learned signature */ |
1da177e4 LT |
385 | struct bulk_cb_wrap work_bcb; |
386 | struct bulk_cs_wrap work_bcs; | |
387 | struct usb_ctrlrequest work_cr; | |
388 | ||
2c26c9e6 PZ |
389 | struct work_struct reset_work; |
390 | wait_queue_head_t reset_wait; | |
391 | ||
64bd8453 | 392 | int sg_stat[6]; |
1da177e4 LT |
393 | struct ub_scsi_trace tr; |
394 | }; | |
395 | ||
396 | /* | |
397 | */ | |
398 | static void ub_cleanup(struct ub_dev *sc); | |
6c1eb8c1 | 399 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq); |
2c26c9e6 PZ |
400 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
401 | struct ub_scsi_cmd *cmd, struct ub_request *urq); | |
402 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, | |
403 | struct ub_scsi_cmd *cmd, struct ub_request *urq); | |
1da177e4 LT |
404 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
405 | static void ub_end_rq(struct request *rq, int uptodate); | |
2c26c9e6 PZ |
406 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
407 | struct ub_request *urq, struct ub_scsi_cmd *cmd); | |
1da177e4 LT |
408 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
409 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt); | |
410 | static void ub_scsi_action(unsigned long _dev); | |
411 | static void ub_scsi_dispatch(struct ub_dev *sc); | |
412 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
a1cf96ef | 413 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1da177e4 | 414 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); |
1872bceb | 415 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1da177e4 | 416 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1872bceb | 417 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1da177e4 LT |
418 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
419 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
420 | int stalled_pipe); | |
421 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); | |
2c2e4a2e | 422 | static void ub_reset_enter(struct ub_dev *sc, int try); |
2c26c9e6 | 423 | static void ub_reset_task(void *arg); |
f4800078 PZ |
424 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); |
425 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, | |
426 | struct ub_capacity *ret); | |
2c2e4a2e PZ |
427 | static int ub_sync_reset(struct ub_dev *sc); |
428 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe); | |
f4800078 | 429 | static int ub_probe_lun(struct ub_dev *sc, int lnum); |
1da177e4 LT |
430 | |
431 | /* | |
432 | */ | |
a00828e9 PZ |
433 | #ifdef CONFIG_USB_LIBUSUAL |
434 | ||
435 | #define ub_usb_ids storage_usb_ids | |
436 | #else | |
437 | ||
1da177e4 | 438 | static struct usb_device_id ub_usb_ids[] = { |
1da177e4 LT |
439 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, |
440 | { } | |
441 | }; | |
442 | ||
443 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); | |
a00828e9 | 444 | #endif /* CONFIG_USB_LIBUSUAL */ |
1da177e4 LT |
445 | |
446 | /* | |
447 | * Find me a way to identify "next free minor" for add_disk(), | |
448 | * and the array disappears the next day. However, the number of | |
449 | * hosts has something to do with the naming and /proc/partitions. | |
450 | * This has to be thought out in detail before changing. | |
451 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. | |
452 | */ | |
453 | #define UB_MAX_HOSTS 26 | |
454 | static char ub_hostv[UB_MAX_HOSTS]; | |
f4800078 | 455 | |
65b4fe55 PZ |
456 | #define UB_QLOCK_NUM 5 |
457 | static spinlock_t ub_qlockv[UB_QLOCK_NUM]; | |
458 | static int ub_qlock_next = 0; | |
459 | ||
1da177e4 LT |
460 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ |
461 | ||
462 | /* | |
463 | * The SCSI command tracing procedures. | |
464 | */ | |
465 | ||
466 | static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
467 | { | |
468 | int n; | |
469 | struct ub_scsi_cmd_trace *t; | |
470 | ||
471 | if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0; | |
472 | t = &sc->tr.vec[n]; | |
473 | ||
474 | memset(t, 0, sizeof(struct ub_scsi_cmd_trace)); | |
475 | t->tag = cmd->tag; | |
476 | t->op = cmd->cdb[0]; | |
477 | t->dir = cmd->dir; | |
478 | t->req_size = cmd->len; | |
479 | t->st_hst[0] = cmd->state; | |
480 | ||
481 | sc->tr.cur = n; | |
482 | cmd->trace_index = n; | |
483 | } | |
484 | ||
485 | static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
486 | { | |
487 | int n; | |
488 | struct ub_scsi_cmd_trace *t; | |
489 | ||
490 | t = &sc->tr.vec[cmd->trace_index]; | |
491 | if (t->tag == cmd->tag) { | |
492 | if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0; | |
493 | t->st_hst[n] = cmd->state; | |
494 | t->hcur = n; | |
495 | } | |
496 | } | |
497 | ||
498 | static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
499 | { | |
500 | struct ub_scsi_cmd_trace *t; | |
501 | ||
502 | t = &sc->tr.vec[cmd->trace_index]; | |
503 | if (t->tag == cmd->tag) | |
504 | t->act_size = cmd->act_len; | |
505 | } | |
506 | ||
507 | static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
508 | unsigned char *sense) | |
509 | { | |
510 | struct ub_scsi_cmd_trace *t; | |
511 | ||
512 | t = &sc->tr.vec[cmd->trace_index]; | |
513 | if (t->tag == cmd->tag) { | |
514 | t->key = sense[2] & 0x0F; | |
515 | t->asc = sense[12]; | |
516 | t->ascq = sense[13]; | |
517 | } | |
518 | } | |
519 | ||
07d4fd25 PZ |
520 | static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr, |
521 | char *page) | |
1da177e4 LT |
522 | { |
523 | struct usb_interface *intf; | |
524 | struct ub_dev *sc; | |
f4800078 PZ |
525 | struct list_head *p; |
526 | struct ub_lun *lun; | |
1da177e4 LT |
527 | int cnt; |
528 | unsigned long flags; | |
529 | int nc, nh; | |
530 | int i, j; | |
531 | struct ub_scsi_cmd_trace *t; | |
532 | ||
533 | intf = to_usb_interface(dev); | |
534 | sc = usb_get_intfdata(intf); | |
535 | if (sc == NULL) | |
536 | return 0; | |
537 | ||
538 | cnt = 0; | |
65b4fe55 | 539 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 | 540 | |
2c26c9e6 PZ |
541 | cnt += sprintf(page + cnt, |
542 | "poison %d reset %d\n", | |
543 | atomic_read(&sc->poison), sc->reset); | |
1da177e4 | 544 | cnt += sprintf(page + cnt, |
f4800078 PZ |
545 | "qlen %d qmax %d\n", |
546 | sc->cmd_queue.qlen, sc->cmd_queue.qmax); | |
ba6abf13 | 547 | cnt += sprintf(page + cnt, |
64bd8453 | 548 | "sg %d %d %d %d %d .. %d\n", |
ba6abf13 PZ |
549 | sc->sg_stat[0], |
550 | sc->sg_stat[1], | |
551 | sc->sg_stat[2], | |
552 | sc->sg_stat[3], | |
64bd8453 PZ |
553 | sc->sg_stat[4], |
554 | sc->sg_stat[5]); | |
f4800078 PZ |
555 | |
556 | list_for_each (p, &sc->luns) { | |
557 | lun = list_entry(p, struct ub_lun, link); | |
558 | cnt += sprintf(page + cnt, | |
559 | "lun %u changed %d removable %d readonly %d\n", | |
560 | lun->num, lun->changed, lun->removable, lun->readonly); | |
561 | } | |
1da177e4 LT |
562 | |
563 | if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0; | |
564 | for (j = 0; j < SCMD_TRACE_SZ; j++) { | |
565 | t = &sc->tr.vec[nc]; | |
566 | ||
567 | cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op); | |
568 | if (t->op == REQUEST_SENSE) { | |
569 | cnt += sprintf(page + cnt, " [sense %x %02x %02x]", | |
570 | t->key, t->asc, t->ascq); | |
571 | } else { | |
572 | cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir)); | |
573 | cnt += sprintf(page + cnt, " [%5d %5d]", | |
574 | t->req_size, t->act_size); | |
575 | } | |
576 | if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0; | |
577 | for (i = 0; i < SCMD_ST_HIST_SZ; i++) { | |
578 | cnt += sprintf(page + cnt, " %s", | |
579 | ub_scsi_cmd_stname[(int)t->st_hst[nh]]); | |
580 | if (++nh == SCMD_ST_HIST_SZ) nh = 0; | |
581 | } | |
582 | cnt += sprintf(page + cnt, "\n"); | |
583 | ||
584 | if (++nc == SCMD_TRACE_SZ) nc = 0; | |
585 | } | |
586 | ||
65b4fe55 | 587 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
588 | return cnt; |
589 | } | |
590 | ||
591 | static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */ | |
592 | ||
593 | /* | |
594 | * The id allocator. | |
595 | * | |
596 | * This also stores the host for indexing by minor, which is somewhat dirty. | |
597 | */ | |
598 | static int ub_id_get(void) | |
599 | { | |
600 | unsigned long flags; | |
601 | int i; | |
602 | ||
603 | spin_lock_irqsave(&ub_lock, flags); | |
604 | for (i = 0; i < UB_MAX_HOSTS; i++) { | |
605 | if (ub_hostv[i] == 0) { | |
606 | ub_hostv[i] = 1; | |
607 | spin_unlock_irqrestore(&ub_lock, flags); | |
608 | return i; | |
609 | } | |
610 | } | |
611 | spin_unlock_irqrestore(&ub_lock, flags); | |
612 | return -1; | |
613 | } | |
614 | ||
615 | static void ub_id_put(int id) | |
616 | { | |
617 | unsigned long flags; | |
618 | ||
619 | if (id < 0 || id >= UB_MAX_HOSTS) { | |
620 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); | |
621 | return; | |
622 | } | |
623 | ||
624 | spin_lock_irqsave(&ub_lock, flags); | |
625 | if (ub_hostv[id] == 0) { | |
626 | spin_unlock_irqrestore(&ub_lock, flags); | |
627 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); | |
628 | return; | |
629 | } | |
630 | ub_hostv[id] = 0; | |
631 | spin_unlock_irqrestore(&ub_lock, flags); | |
632 | } | |
633 | ||
65b4fe55 PZ |
634 | /* |
635 | * This is necessitated by the fact that blk_cleanup_queue does not | |
636 | * necesserily destroy the queue. Instead, it may merely decrease q->refcnt. | |
637 | * Since our blk_init_queue() passes a spinlock common with ub_dev, | |
638 | * we have life time issues when ub_cleanup frees ub_dev. | |
639 | */ | |
640 | static spinlock_t *ub_next_lock(void) | |
641 | { | |
642 | unsigned long flags; | |
643 | spinlock_t *ret; | |
644 | ||
645 | spin_lock_irqsave(&ub_lock, flags); | |
646 | ret = &ub_qlockv[ub_qlock_next]; | |
647 | ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM; | |
648 | spin_unlock_irqrestore(&ub_lock, flags); | |
649 | return ret; | |
650 | } | |
651 | ||
1da177e4 LT |
652 | /* |
653 | * Downcount for deallocation. This rides on two assumptions: | |
654 | * - once something is poisoned, its refcount cannot grow | |
655 | * - opens cannot happen at this time (del_gendisk was done) | |
656 | * If the above is true, we can drop the lock, which we need for | |
657 | * blk_cleanup_queue(): the silly thing may attempt to sleep. | |
658 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] | |
659 | */ | |
660 | static void ub_put(struct ub_dev *sc) | |
661 | { | |
662 | unsigned long flags; | |
663 | ||
664 | spin_lock_irqsave(&ub_lock, flags); | |
665 | --sc->openc; | |
666 | if (sc->openc == 0 && atomic_read(&sc->poison)) { | |
667 | spin_unlock_irqrestore(&ub_lock, flags); | |
668 | ub_cleanup(sc); | |
669 | } else { | |
670 | spin_unlock_irqrestore(&ub_lock, flags); | |
671 | } | |
672 | } | |
673 | ||
674 | /* | |
675 | * Final cleanup and deallocation. | |
676 | */ | |
677 | static void ub_cleanup(struct ub_dev *sc) | |
678 | { | |
f4800078 PZ |
679 | struct list_head *p; |
680 | struct ub_lun *lun; | |
1da177e4 LT |
681 | request_queue_t *q; |
682 | ||
f4800078 PZ |
683 | while (!list_empty(&sc->luns)) { |
684 | p = sc->luns.next; | |
685 | lun = list_entry(p, struct ub_lun, link); | |
686 | list_del(p); | |
1da177e4 | 687 | |
f4800078 PZ |
688 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ |
689 | if ((q = lun->disk->queue) != NULL) | |
690 | blk_cleanup_queue(q); | |
691 | /* | |
692 | * If we zero disk->private_data BEFORE put_disk, we have | |
693 | * to check for NULL all over the place in open, release, | |
694 | * check_media and revalidate, because the block level | |
695 | * semaphore is well inside the put_disk. | |
696 | * But we cannot zero after the call, because *disk is gone. | |
697 | * The sd.c is blatantly racy in this area. | |
698 | */ | |
699 | /* disk->private_data = NULL; */ | |
700 | put_disk(lun->disk); | |
701 | lun->disk = NULL; | |
702 | ||
703 | ub_id_put(lun->id); | |
704 | kfree(lun); | |
705 | } | |
1da177e4 | 706 | |
1da177e4 LT |
707 | kfree(sc); |
708 | } | |
709 | ||
710 | /* | |
711 | * The "command allocator". | |
712 | */ | |
f4800078 | 713 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) |
1da177e4 LT |
714 | { |
715 | struct ub_scsi_cmd *ret; | |
716 | ||
f4800078 | 717 | if (lun->cmda[0]) |
1da177e4 | 718 | return NULL; |
f4800078 PZ |
719 | ret = &lun->cmdv[0]; |
720 | lun->cmda[0] = 1; | |
1da177e4 LT |
721 | return ret; |
722 | } | |
723 | ||
f4800078 | 724 | static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) |
1da177e4 | 725 | { |
f4800078 | 726 | if (cmd != &lun->cmdv[0]) { |
1da177e4 | 727 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", |
f4800078 | 728 | lun->name, cmd); |
1da177e4 LT |
729 | return; |
730 | } | |
f4800078 PZ |
731 | if (!lun->cmda[0]) { |
732 | printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); | |
1da177e4 LT |
733 | return; |
734 | } | |
f4800078 | 735 | lun->cmda[0] = 0; |
1da177e4 LT |
736 | } |
737 | ||
738 | /* | |
739 | * The command queue. | |
740 | */ | |
741 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
742 | { | |
743 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
744 | ||
745 | if (t->qlen++ == 0) { | |
746 | t->head = cmd; | |
747 | t->tail = cmd; | |
748 | } else { | |
749 | t->tail->next = cmd; | |
750 | t->tail = cmd; | |
751 | } | |
752 | ||
753 | if (t->qlen > t->qmax) | |
754 | t->qmax = t->qlen; | |
755 | } | |
756 | ||
757 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
758 | { | |
759 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
760 | ||
761 | if (t->qlen++ == 0) { | |
762 | t->head = cmd; | |
763 | t->tail = cmd; | |
764 | } else { | |
765 | cmd->next = t->head; | |
766 | t->head = cmd; | |
767 | } | |
768 | ||
769 | if (t->qlen > t->qmax) | |
770 | t->qmax = t->qlen; | |
771 | } | |
772 | ||
773 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) | |
774 | { | |
775 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
776 | struct ub_scsi_cmd *cmd; | |
777 | ||
778 | if (t->qlen == 0) | |
779 | return NULL; | |
780 | if (--t->qlen == 0) | |
781 | t->tail = NULL; | |
782 | cmd = t->head; | |
783 | t->head = cmd->next; | |
784 | cmd->next = NULL; | |
785 | return cmd; | |
786 | } | |
787 | ||
788 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) | |
789 | ||
790 | /* | |
791 | * The request function is our main entry point | |
792 | */ | |
793 | ||
6c1eb8c1 | 794 | static void ub_request_fn(request_queue_t *q) |
1da177e4 | 795 | { |
f4800078 | 796 | struct ub_lun *lun = q->queuedata; |
1da177e4 LT |
797 | struct request *rq; |
798 | ||
799 | while ((rq = elv_next_request(q)) != NULL) { | |
6c1eb8c1 | 800 | if (ub_request_fn_1(lun, rq) != 0) { |
1da177e4 LT |
801 | blk_stop_queue(q); |
802 | break; | |
803 | } | |
804 | } | |
805 | } | |
806 | ||
6c1eb8c1 | 807 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq) |
1da177e4 | 808 | { |
f4800078 | 809 | struct ub_dev *sc = lun->udev; |
1da177e4 | 810 | struct ub_scsi_cmd *cmd; |
2c26c9e6 PZ |
811 | struct ub_request *urq; |
812 | int n_elem; | |
1da177e4 | 813 | |
f4800078 | 814 | if (atomic_read(&sc->poison) || lun->changed) { |
1da177e4 LT |
815 | blkdev_dequeue_request(rq); |
816 | ub_end_rq(rq, 0); | |
817 | return 0; | |
818 | } | |
819 | ||
2c26c9e6 PZ |
820 | if (lun->urq.rq != NULL) |
821 | return -1; | |
f4800078 | 822 | if ((cmd = ub_get_cmd(lun)) == NULL) |
1da177e4 LT |
823 | return -1; |
824 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
825 | ||
826 | blkdev_dequeue_request(rq); | |
2c26c9e6 PZ |
827 | |
828 | urq = &lun->urq; | |
829 | memset(urq, 0, sizeof(struct ub_request)); | |
830 | urq->rq = rq; | |
831 | ||
832 | /* | |
833 | * get scatterlist from block layer | |
834 | */ | |
835 | n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]); | |
836 | if (n_elem < 0) { | |
837 | printk(KERN_INFO "%s: failed request map (%d)\n", | |
838 | lun->name, n_elem); /* P3 */ | |
839 | goto drop; | |
840 | } | |
841 | if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */ | |
842 | printk(KERN_WARNING "%s: request with %d segments\n", | |
843 | lun->name, n_elem); | |
844 | goto drop; | |
845 | } | |
846 | urq->nsg = n_elem; | |
847 | sc->sg_stat[n_elem < 5 ? n_elem : 5]++; | |
848 | ||
1da177e4 | 849 | if (blk_pc_request(rq)) { |
2c26c9e6 | 850 | ub_cmd_build_packet(sc, lun, cmd, urq); |
1da177e4 | 851 | } else { |
2c26c9e6 | 852 | ub_cmd_build_block(sc, lun, cmd, urq); |
1da177e4 | 853 | } |
1da177e4 | 854 | cmd->state = UB_CMDST_INIT; |
f4800078 | 855 | cmd->lun = lun; |
1da177e4 | 856 | cmd->done = ub_rw_cmd_done; |
2c26c9e6 | 857 | cmd->back = urq; |
1da177e4 LT |
858 | |
859 | cmd->tag = sc->tagcnt++; | |
2c26c9e6 PZ |
860 | if (ub_submit_scsi(sc, cmd) != 0) |
861 | goto drop; | |
862 | ||
863 | return 0; | |
1da177e4 | 864 | |
2c26c9e6 PZ |
865 | drop: |
866 | ub_put_cmd(lun, cmd); | |
867 | ub_end_rq(rq, 0); | |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
2c26c9e6 PZ |
871 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
872 | struct ub_scsi_cmd *cmd, struct ub_request *urq) | |
1da177e4 | 873 | { |
2c26c9e6 | 874 | struct request *rq = urq->rq; |
a1cf96ef | 875 | unsigned int block, nblks; |
1da177e4 LT |
876 | |
877 | if (rq_data_dir(rq) == WRITE) | |
2c26c9e6 | 878 | cmd->dir = UB_DIR_WRITE; |
1da177e4 | 879 | else |
2c26c9e6 | 880 | cmd->dir = UB_DIR_READ; |
1da177e4 | 881 | |
2c26c9e6 PZ |
882 | cmd->nsg = urq->nsg; |
883 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); | |
1da177e4 LT |
884 | |
885 | /* | |
886 | * build the command | |
887 | * | |
888 | * The call to blk_queue_hardsect_size() guarantees that request | |
889 | * is aligned, but it is given in terms of 512 byte units, always. | |
890 | */ | |
a1cf96ef PZ |
891 | block = rq->sector >> lun->capacity.bshift; |
892 | nblks = rq->nr_sectors >> lun->capacity.bshift; | |
ba6abf13 | 893 | |
2c26c9e6 | 894 | cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10; |
1da177e4 LT |
895 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ |
896 | cmd->cdb[2] = block >> 24; | |
897 | cmd->cdb[3] = block >> 16; | |
898 | cmd->cdb[4] = block >> 8; | |
899 | cmd->cdb[5] = block; | |
900 | cmd->cdb[7] = nblks >> 8; | |
901 | cmd->cdb[8] = nblks; | |
902 | cmd->cdb_len = 10; | |
903 | ||
a1cf96ef | 904 | cmd->len = rq->nr_sectors * 512; |
1da177e4 LT |
905 | } |
906 | ||
2c26c9e6 PZ |
907 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, |
908 | struct ub_scsi_cmd *cmd, struct ub_request *urq) | |
1da177e4 | 909 | { |
2c26c9e6 | 910 | struct request *rq = urq->rq; |
1da177e4 LT |
911 | |
912 | if (rq->data_len == 0) { | |
913 | cmd->dir = UB_DIR_NONE; | |
914 | } else { | |
915 | if (rq_data_dir(rq) == WRITE) | |
916 | cmd->dir = UB_DIR_WRITE; | |
917 | else | |
918 | cmd->dir = UB_DIR_READ; | |
919 | } | |
a1cf96ef | 920 | |
2c26c9e6 PZ |
921 | cmd->nsg = urq->nsg; |
922 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); | |
a1cf96ef PZ |
923 | |
924 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); | |
925 | cmd->cdb_len = rq->cmd_len; | |
926 | ||
1da177e4 | 927 | cmd->len = rq->data_len; |
1da177e4 LT |
928 | } |
929 | ||
930 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
931 | { | |
f4800078 | 932 | struct ub_lun *lun = cmd->lun; |
2c26c9e6 PZ |
933 | struct ub_request *urq = cmd->back; |
934 | struct request *rq; | |
1da177e4 LT |
935 | int uptodate; |
936 | ||
2c26c9e6 PZ |
937 | rq = urq->rq; |
938 | ||
a1cf96ef | 939 | if (cmd->error == 0) { |
1da177e4 | 940 | uptodate = 1; |
1da177e4 | 941 | |
a1cf96ef PZ |
942 | if (blk_pc_request(rq)) { |
943 | if (cmd->act_len >= rq->data_len) | |
944 | rq->data_len = 0; | |
945 | else | |
946 | rq->data_len -= cmd->act_len; | |
ba6abf13 | 947 | } |
a1cf96ef | 948 | } else { |
ba6abf13 | 949 | uptodate = 0; |
ba6abf13 | 950 | |
a1cf96ef PZ |
951 | if (blk_pc_request(rq)) { |
952 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ | |
953 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); | |
954 | rq->sense_len = UB_SENSE_SIZE; | |
955 | if (sc->top_sense[0] != 0) | |
956 | rq->errors = SAM_STAT_CHECK_CONDITION; | |
957 | else | |
958 | rq->errors = DID_ERROR << 16; | |
2c26c9e6 PZ |
959 | } else { |
960 | if (cmd->error == -EIO) { | |
961 | if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0) | |
962 | return; | |
963 | } | |
a1cf96ef PZ |
964 | } |
965 | } | |
ba6abf13 | 966 | |
2c26c9e6 PZ |
967 | urq->rq = NULL; |
968 | ||
f4800078 | 969 | ub_put_cmd(lun, cmd); |
1da177e4 | 970 | ub_end_rq(rq, uptodate); |
ba6abf13 | 971 | blk_start_queue(lun->disk->queue); |
1da177e4 LT |
972 | } |
973 | ||
974 | static void ub_end_rq(struct request *rq, int uptodate) | |
975 | { | |
ab93091d | 976 | end_that_request_first(rq, uptodate, rq->hard_nr_sectors); |
8ffdc655 | 977 | end_that_request_last(rq, uptodate); |
1da177e4 LT |
978 | } |
979 | ||
2c26c9e6 PZ |
980 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
981 | struct ub_request *urq, struct ub_scsi_cmd *cmd) | |
982 | { | |
983 | ||
984 | if (atomic_read(&sc->poison)) | |
985 | return -ENXIO; | |
986 | ||
2c2e4a2e | 987 | ub_reset_enter(sc, urq->current_try); |
2c26c9e6 PZ |
988 | |
989 | if (urq->current_try >= 3) | |
990 | return -EIO; | |
991 | urq->current_try++; | |
992 | /* P3 */ printk("%s: dir %c len/act %d/%d " | |
993 | "[sense %x %02x %02x] retry %d\n", | |
994 | sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len, | |
995 | cmd->key, cmd->asc, cmd->ascq, urq->current_try); | |
996 | ||
997 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
998 | ub_cmd_build_block(sc, lun, cmd, urq); | |
999 | ||
1000 | cmd->state = UB_CMDST_INIT; | |
1001 | cmd->lun = lun; | |
1002 | cmd->done = ub_rw_cmd_done; | |
1003 | cmd->back = urq; | |
1004 | ||
1005 | cmd->tag = sc->tagcnt++; | |
1006 | ||
1007 | #if 0 /* Wasteful */ | |
1008 | return ub_submit_scsi(sc, cmd); | |
1009 | #else | |
1010 | ub_cmdq_add(sc, cmd); | |
1011 | return 0; | |
1012 | #endif | |
1013 | } | |
1014 | ||
1da177e4 LT |
1015 | /* |
1016 | * Submit a regular SCSI operation (not an auto-sense). | |
1017 | * | |
1018 | * The Iron Law of Good Submit Routine is: | |
1019 | * Zero return - callback is done, Nonzero return - callback is not done. | |
1020 | * No exceptions. | |
1021 | * | |
1022 | * Host is assumed locked. | |
1da177e4 LT |
1023 | */ |
1024 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1025 | { | |
1026 | ||
1027 | if (cmd->state != UB_CMDST_INIT || | |
1028 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { | |
1029 | return -EINVAL; | |
1030 | } | |
1031 | ||
1032 | ub_cmdq_add(sc, cmd); | |
1033 | /* | |
1034 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little | |
1035 | * safer to jump to a tasklet, in case upper layers do something silly. | |
1036 | */ | |
1037 | tasklet_schedule(&sc->tasklet); | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * Submit the first URB for the queued command. | |
1043 | * This function does not deal with queueing in any way. | |
1044 | */ | |
1045 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1046 | { | |
1047 | struct bulk_cb_wrap *bcb; | |
1048 | int rc; | |
1049 | ||
1050 | bcb = &sc->work_bcb; | |
1051 | ||
1052 | /* | |
1053 | * ``If the allocation length is eighteen or greater, and a device | |
1054 | * server returns less than eithteen bytes of data, the application | |
1055 | * client should assume that the bytes not transferred would have been | |
1056 | * zeroes had the device server returned those bytes.'' | |
1057 | * | |
1058 | * We zero sense for all commands so that when a packet request | |
1059 | * fails it does not return a stale sense. | |
1060 | */ | |
1061 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); | |
1062 | ||
1063 | /* set up the command wrapper */ | |
1064 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1065 | bcb->Tag = cmd->tag; /* Endianness is not important */ | |
1066 | bcb->DataTransferLength = cpu_to_le32(cmd->len); | |
1067 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; | |
f4800078 | 1068 | bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; |
1da177e4 LT |
1069 | bcb->Length = cmd->cdb_len; |
1070 | ||
1071 | /* copy the command payload */ | |
1072 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); | |
1073 | ||
1074 | UB_INIT_COMPLETION(sc->work_done); | |
1075 | ||
1076 | sc->last_pipe = sc->send_bulk_pipe; | |
1077 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, | |
1078 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); | |
1da177e4 LT |
1079 | |
1080 | /* Fill what we shouldn't be filling, because usb-storage did so. */ | |
1081 | sc->work_urb.actual_length = 0; | |
1082 | sc->work_urb.error_count = 0; | |
1083 | sc->work_urb.status = 0; | |
1084 | ||
1085 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1086 | /* XXX Clear stalls */ | |
1da177e4 LT |
1087 | ub_complete(&sc->work_done); |
1088 | return rc; | |
1089 | } | |
1090 | ||
1091 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; | |
1092 | add_timer(&sc->work_timer); | |
1093 | ||
1094 | cmd->state = UB_CMDST_CMD; | |
1095 | ub_cmdtr_state(sc, cmd); | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | /* | |
1100 | * Timeout handler. | |
1101 | */ | |
1102 | static void ub_urb_timeout(unsigned long arg) | |
1103 | { | |
1104 | struct ub_dev *sc = (struct ub_dev *) arg; | |
1105 | unsigned long flags; | |
1106 | ||
65b4fe55 | 1107 | spin_lock_irqsave(sc->lock, flags); |
b31f821c PZ |
1108 | if (!ub_is_completed(&sc->work_done)) |
1109 | usb_unlink_urb(&sc->work_urb); | |
65b4fe55 | 1110 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | /* | |
1114 | * Completion routine for the work URB. | |
1115 | * | |
1116 | * This can be called directly from usb_submit_urb (while we have | |
1117 | * the sc->lock taken) and from an interrupt (while we do NOT have | |
1118 | * the sc->lock taken). Therefore, bounce this off to a tasklet. | |
1119 | */ | |
1120 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt) | |
1121 | { | |
1122 | struct ub_dev *sc = urb->context; | |
1123 | ||
1124 | ub_complete(&sc->work_done); | |
1125 | tasklet_schedule(&sc->tasklet); | |
1126 | } | |
1127 | ||
1128 | static void ub_scsi_action(unsigned long _dev) | |
1129 | { | |
1130 | struct ub_dev *sc = (struct ub_dev *) _dev; | |
1131 | unsigned long flags; | |
1132 | ||
65b4fe55 | 1133 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 | 1134 | ub_scsi_dispatch(sc); |
65b4fe55 | 1135 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | static void ub_scsi_dispatch(struct ub_dev *sc) | |
1139 | { | |
1140 | struct ub_scsi_cmd *cmd; | |
1141 | int rc; | |
1142 | ||
2c26c9e6 | 1143 | while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) { |
1da177e4 LT |
1144 | if (cmd->state == UB_CMDST_DONE) { |
1145 | ub_cmdq_pop(sc); | |
1146 | (*cmd->done)(sc, cmd); | |
1147 | } else if (cmd->state == UB_CMDST_INIT) { | |
1148 | ub_cmdtr_new(sc, cmd); | |
1149 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) | |
1150 | break; | |
1151 | cmd->error = rc; | |
1152 | cmd->state = UB_CMDST_DONE; | |
1153 | ub_cmdtr_state(sc, cmd); | |
1154 | } else { | |
1155 | if (!ub_is_completed(&sc->work_done)) | |
1156 | break; | |
b31f821c | 1157 | del_timer(&sc->work_timer); |
1da177e4 LT |
1158 | ub_scsi_urb_compl(sc, cmd); |
1159 | } | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1164 | { | |
1165 | struct urb *urb = &sc->work_urb; | |
1166 | struct bulk_cs_wrap *bcs; | |
2c26c9e6 | 1167 | int len; |
1da177e4 LT |
1168 | int rc; |
1169 | ||
1170 | if (atomic_read(&sc->poison)) { | |
2c26c9e6 PZ |
1171 | ub_state_done(sc, cmd, -ENODEV); |
1172 | return; | |
1da177e4 LT |
1173 | } |
1174 | ||
1175 | if (cmd->state == UB_CMDST_CLEAR) { | |
1176 | if (urb->status == -EPIPE) { | |
1177 | /* | |
1178 | * STALL while clearning STALL. | |
1179 | * The control pipe clears itself - nothing to do. | |
1da177e4 | 1180 | */ |
f4800078 PZ |
1181 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
1182 | sc->name); | |
1da177e4 LT |
1183 | goto Bad_End; |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * We ignore the result for the halt clear. | |
1188 | */ | |
1189 | ||
1190 | /* reset the endpoint toggle */ | |
1191 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1192 | usb_pipeout(sc->last_pipe), 0); | |
1193 | ||
1194 | ub_state_sense(sc, cmd); | |
1195 | ||
1196 | } else if (cmd->state == UB_CMDST_CLR2STS) { | |
1197 | if (urb->status == -EPIPE) { | |
f4800078 PZ |
1198 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
1199 | sc->name); | |
1da177e4 LT |
1200 | goto Bad_End; |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * We ignore the result for the halt clear. | |
1205 | */ | |
1206 | ||
1207 | /* reset the endpoint toggle */ | |
1208 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1209 | usb_pipeout(sc->last_pipe), 0); | |
1210 | ||
1211 | ub_state_stat(sc, cmd); | |
1212 | ||
1872bceb PZ |
1213 | } else if (cmd->state == UB_CMDST_CLRRS) { |
1214 | if (urb->status == -EPIPE) { | |
1872bceb PZ |
1215 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
1216 | sc->name); | |
1217 | goto Bad_End; | |
1218 | } | |
1219 | ||
1220 | /* | |
1221 | * We ignore the result for the halt clear. | |
1222 | */ | |
1223 | ||
1224 | /* reset the endpoint toggle */ | |
1225 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1226 | usb_pipeout(sc->last_pipe), 0); | |
1227 | ||
1228 | ub_state_stat_counted(sc, cmd); | |
1229 | ||
1da177e4 | 1230 | } else if (cmd->state == UB_CMDST_CMD) { |
2c26c9e6 PZ |
1231 | switch (urb->status) { |
1232 | case 0: | |
1233 | break; | |
1234 | case -EOVERFLOW: | |
1235 | goto Bad_End; | |
1236 | case -EPIPE: | |
1da177e4 LT |
1237 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
1238 | if (rc != 0) { | |
1239 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1240 | "unable to submit clear (%d)\n", |
1241 | sc->name, rc); | |
1da177e4 LT |
1242 | /* |
1243 | * This is typically ENOMEM or some other such shit. | |
1244 | * Retrying is pointless. Just do Bad End on it... | |
1245 | */ | |
2c26c9e6 PZ |
1246 | ub_state_done(sc, cmd, rc); |
1247 | return; | |
1da177e4 LT |
1248 | } |
1249 | cmd->state = UB_CMDST_CLEAR; | |
1250 | ub_cmdtr_state(sc, cmd); | |
1251 | return; | |
2c26c9e6 PZ |
1252 | case -ESHUTDOWN: /* unplug */ |
1253 | case -EILSEQ: /* unplug timeout on uhci */ | |
1254 | ub_state_done(sc, cmd, -ENODEV); | |
1255 | return; | |
1256 | default: | |
1da177e4 LT |
1257 | goto Bad_End; |
1258 | } | |
1259 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { | |
1da177e4 LT |
1260 | goto Bad_End; |
1261 | } | |
1262 | ||
a1cf96ef | 1263 | if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) { |
1da177e4 LT |
1264 | ub_state_stat(sc, cmd); |
1265 | return; | |
1266 | } | |
1267 | ||
a1cf96ef PZ |
1268 | // udelay(125); // usb-storage has this |
1269 | ub_data_start(sc, cmd); | |
1da177e4 LT |
1270 | |
1271 | } else if (cmd->state == UB_CMDST_DATA) { | |
1272 | if (urb->status == -EPIPE) { | |
1273 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1274 | if (rc != 0) { | |
1275 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1276 | "unable to submit clear (%d)\n", |
1277 | sc->name, rc); | |
2c26c9e6 PZ |
1278 | ub_state_done(sc, cmd, rc); |
1279 | return; | |
1da177e4 LT |
1280 | } |
1281 | cmd->state = UB_CMDST_CLR2STS; | |
1282 | ub_cmdtr_state(sc, cmd); | |
1283 | return; | |
1284 | } | |
1285 | if (urb->status == -EOVERFLOW) { | |
1286 | /* | |
1287 | * A babble? Failure, but we must transfer CSW now. | |
1288 | */ | |
1289 | cmd->error = -EOVERFLOW; /* A cheap trick... */ | |
a1cf96ef PZ |
1290 | ub_state_stat(sc, cmd); |
1291 | return; | |
1da177e4 | 1292 | } |
2c26c9e6 PZ |
1293 | |
1294 | if (cmd->dir == UB_DIR_WRITE) { | |
1295 | /* | |
1296 | * Do not continue writes in case of a failure. | |
1297 | * Doing so would cause sectors to be mixed up, | |
1298 | * which is worse than sectors lost. | |
1299 | * | |
1300 | * We must try to read the CSW, or many devices | |
1301 | * get confused. | |
1302 | */ | |
1303 | len = urb->actual_length; | |
1304 | if (urb->status != 0 || | |
1305 | len != cmd->sgv[cmd->current_sg].length) { | |
1306 | cmd->act_len += len; | |
1307 | ub_cmdtr_act_len(sc, cmd); | |
1308 | ||
1309 | cmd->error = -EIO; | |
1310 | ub_state_stat(sc, cmd); | |
1311 | return; | |
1312 | } | |
1313 | ||
1314 | } else { | |
1315 | /* | |
1316 | * If an error occurs on read, we record it, and | |
1317 | * continue to fetch data in order to avoid bubble. | |
1318 | * | |
1319 | * As a small shortcut, we stop if we detect that | |
1320 | * a CSW mixed into data. | |
1321 | */ | |
1322 | if (urb->status != 0) | |
1323 | cmd->error = -EIO; | |
1324 | ||
1325 | len = urb->actual_length; | |
1326 | if (urb->status != 0 || | |
1327 | len != cmd->sgv[cmd->current_sg].length) { | |
1328 | if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN) | |
1329 | goto Bad_End; | |
1330 | } | |
1331 | } | |
1da177e4 | 1332 | |
a1cf96ef | 1333 | cmd->act_len += urb->actual_length; |
1da177e4 LT |
1334 | ub_cmdtr_act_len(sc, cmd); |
1335 | ||
a1cf96ef PZ |
1336 | if (++cmd->current_sg < cmd->nsg) { |
1337 | ub_data_start(sc, cmd); | |
1338 | return; | |
1339 | } | |
1da177e4 LT |
1340 | ub_state_stat(sc, cmd); |
1341 | ||
1342 | } else if (cmd->state == UB_CMDST_STAT) { | |
1343 | if (urb->status == -EPIPE) { | |
1344 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1345 | if (rc != 0) { | |
1346 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1347 | "unable to submit clear (%d)\n", |
1348 | sc->name, rc); | |
2c26c9e6 PZ |
1349 | ub_state_done(sc, cmd, rc); |
1350 | return; | |
1da177e4 | 1351 | } |
1872bceb PZ |
1352 | |
1353 | /* | |
1354 | * Having a stall when getting CSW is an error, so | |
1355 | * make sure uppper levels are not oblivious to it. | |
1356 | */ | |
1357 | cmd->error = -EIO; /* A cheap trick... */ | |
1358 | ||
1359 | cmd->state = UB_CMDST_CLRRS; | |
1da177e4 LT |
1360 | ub_cmdtr_state(sc, cmd); |
1361 | return; | |
1362 | } | |
2c26c9e6 PZ |
1363 | |
1364 | /* Catch everything, including -EOVERFLOW and other nasties. */ | |
1da177e4 LT |
1365 | if (urb->status != 0) |
1366 | goto Bad_End; | |
1367 | ||
1368 | if (urb->actual_length == 0) { | |
1872bceb | 1369 | ub_state_stat_counted(sc, cmd); |
1da177e4 LT |
1370 | return; |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Check the returned Bulk protocol status. | |
1872bceb | 1375 | * The status block has to be validated first. |
1da177e4 LT |
1376 | */ |
1377 | ||
1378 | bcs = &sc->work_bcs; | |
1872bceb PZ |
1379 | |
1380 | if (sc->signature == cpu_to_le32(0)) { | |
1da177e4 | 1381 | /* |
1872bceb PZ |
1382 | * This is the first reply, so do not perform the check. |
1383 | * Instead, remember the signature the device uses | |
1384 | * for future checks. But do not allow a nul. | |
1da177e4 | 1385 | */ |
1872bceb PZ |
1386 | sc->signature = bcs->Signature; |
1387 | if (sc->signature == cpu_to_le32(0)) { | |
1388 | ub_state_stat_counted(sc, cmd); | |
1389 | return; | |
1390 | } | |
1391 | } else { | |
1392 | if (bcs->Signature != sc->signature) { | |
1393 | ub_state_stat_counted(sc, cmd); | |
1394 | return; | |
1395 | } | |
1da177e4 | 1396 | } |
1da177e4 LT |
1397 | |
1398 | if (bcs->Tag != cmd->tag) { | |
1399 | /* | |
1400 | * This usually happens when we disagree with the | |
1401 | * device's microcode about something. For instance, | |
1402 | * a few of them throw this after timeouts. They buffer | |
1403 | * commands and reply at commands we timed out before. | |
1404 | * Without flushing these replies we loop forever. | |
1405 | */ | |
1872bceb | 1406 | ub_state_stat_counted(sc, cmd); |
1da177e4 LT |
1407 | return; |
1408 | } | |
1409 | ||
2c26c9e6 PZ |
1410 | len = le32_to_cpu(bcs->Residue); |
1411 | if (len != cmd->len - cmd->act_len) { | |
1872bceb PZ |
1412 | /* |
1413 | * It is all right to transfer less, the caller has | |
1414 | * to check. But it's not all right if the device | |
1415 | * counts disagree with our counts. | |
1416 | */ | |
1417 | /* P3 */ printk("%s: resid %d len %d act %d\n", | |
2c26c9e6 | 1418 | sc->name, len, cmd->len, cmd->act_len); |
1872bceb PZ |
1419 | goto Bad_End; |
1420 | } | |
1421 | ||
1da177e4 LT |
1422 | switch (bcs->Status) { |
1423 | case US_BULK_STAT_OK: | |
1424 | break; | |
1425 | case US_BULK_STAT_FAIL: | |
1426 | ub_state_sense(sc, cmd); | |
1427 | return; | |
1428 | case US_BULK_STAT_PHASE: | |
1da177e4 LT |
1429 | /* P3 */ printk("%s: status PHASE\n", sc->name); |
1430 | goto Bad_End; | |
1431 | default: | |
1432 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", | |
1433 | sc->name, bcs->Status); | |
2c26c9e6 PZ |
1434 | ub_state_done(sc, cmd, -EINVAL); |
1435 | return; | |
1da177e4 LT |
1436 | } |
1437 | ||
1438 | /* Not zeroing error to preserve a babble indicator */ | |
1872bceb PZ |
1439 | if (cmd->error != 0) { |
1440 | ub_state_sense(sc, cmd); | |
1441 | return; | |
1442 | } | |
1da177e4 LT |
1443 | cmd->state = UB_CMDST_DONE; |
1444 | ub_cmdtr_state(sc, cmd); | |
1445 | ub_cmdq_pop(sc); | |
1446 | (*cmd->done)(sc, cmd); | |
1447 | ||
1448 | } else if (cmd->state == UB_CMDST_SENSE) { | |
1449 | ub_state_done(sc, cmd, -EIO); | |
1450 | ||
1451 | } else { | |
1452 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1453 | "wrong command state %d\n", |
1454 | sc->name, cmd->state); | |
2c26c9e6 PZ |
1455 | ub_state_done(sc, cmd, -EINVAL); |
1456 | return; | |
1da177e4 LT |
1457 | } |
1458 | return; | |
1459 | ||
1460 | Bad_End: /* Little Excel is dead */ | |
1461 | ub_state_done(sc, cmd, -EIO); | |
1462 | } | |
1463 | ||
a1cf96ef PZ |
1464 | /* |
1465 | * Factorization helper for the command state machine: | |
1466 | * Initiate a data segment transfer. | |
1467 | */ | |
1468 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1469 | { | |
1470 | struct scatterlist *sg = &cmd->sgv[cmd->current_sg]; | |
1471 | int pipe; | |
1472 | int rc; | |
1473 | ||
1474 | UB_INIT_COMPLETION(sc->work_done); | |
1475 | ||
1476 | if (cmd->dir == UB_DIR_READ) | |
1477 | pipe = sc->recv_bulk_pipe; | |
1478 | else | |
1479 | pipe = sc->send_bulk_pipe; | |
1480 | sc->last_pipe = pipe; | |
1481 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, | |
1482 | page_address(sg->page) + sg->offset, sg->length, | |
1483 | ub_urb_complete, sc); | |
a1cf96ef PZ |
1484 | sc->work_urb.actual_length = 0; |
1485 | sc->work_urb.error_count = 0; | |
1486 | sc->work_urb.status = 0; | |
1487 | ||
1488 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1489 | /* XXX Clear stalls */ | |
a1cf96ef PZ |
1490 | ub_complete(&sc->work_done); |
1491 | ub_state_done(sc, cmd, rc); | |
1492 | return; | |
1493 | } | |
1494 | ||
1495 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; | |
1496 | add_timer(&sc->work_timer); | |
1497 | ||
1498 | cmd->state = UB_CMDST_DATA; | |
1499 | ub_cmdtr_state(sc, cmd); | |
1500 | } | |
1501 | ||
1da177e4 LT |
1502 | /* |
1503 | * Factorization helper for the command state machine: | |
1504 | * Finish the command. | |
1505 | */ | |
1506 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) | |
1507 | { | |
1508 | ||
1509 | cmd->error = rc; | |
1510 | cmd->state = UB_CMDST_DONE; | |
1511 | ub_cmdtr_state(sc, cmd); | |
1512 | ub_cmdq_pop(sc); | |
1513 | (*cmd->done)(sc, cmd); | |
1514 | } | |
1515 | ||
1516 | /* | |
1517 | * Factorization helper for the command state machine: | |
1518 | * Submit a CSW read. | |
1519 | */ | |
1872bceb | 1520 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
1da177e4 LT |
1521 | { |
1522 | int rc; | |
1523 | ||
1524 | UB_INIT_COMPLETION(sc->work_done); | |
1525 | ||
1526 | sc->last_pipe = sc->recv_bulk_pipe; | |
1527 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, | |
1528 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); | |
1da177e4 LT |
1529 | sc->work_urb.actual_length = 0; |
1530 | sc->work_urb.error_count = 0; | |
1531 | sc->work_urb.status = 0; | |
1532 | ||
1533 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1534 | /* XXX Clear stalls */ | |
1da177e4 LT |
1535 | ub_complete(&sc->work_done); |
1536 | ub_state_done(sc, cmd, rc); | |
1872bceb | 1537 | return -1; |
1da177e4 LT |
1538 | } |
1539 | ||
1540 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; | |
1541 | add_timer(&sc->work_timer); | |
1872bceb | 1542 | return 0; |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | /* | |
1546 | * Factorization helper for the command state machine: | |
1547 | * Submit a CSW read and go to STAT state. | |
1548 | */ | |
1549 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1550 | { | |
1872bceb PZ |
1551 | |
1552 | if (__ub_state_stat(sc, cmd) != 0) | |
1553 | return; | |
1da177e4 LT |
1554 | |
1555 | cmd->stat_count = 0; | |
1556 | cmd->state = UB_CMDST_STAT; | |
1872bceb PZ |
1557 | ub_cmdtr_state(sc, cmd); |
1558 | } | |
1559 | ||
1560 | /* | |
1561 | * Factorization helper for the command state machine: | |
1562 | * Submit a CSW read and go to STAT state with counter (along [C] path). | |
1563 | */ | |
1564 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1565 | { | |
1566 | ||
1567 | if (++cmd->stat_count >= 4) { | |
1568 | ub_state_sense(sc, cmd); | |
1569 | return; | |
1570 | } | |
1571 | ||
1572 | if (__ub_state_stat(sc, cmd) != 0) | |
1573 | return; | |
1574 | ||
1575 | cmd->state = UB_CMDST_STAT; | |
1da177e4 LT |
1576 | ub_cmdtr_state(sc, cmd); |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * Factorization helper for the command state machine: | |
1581 | * Submit a REQUEST SENSE and go to SENSE state. | |
1582 | */ | |
1583 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1584 | { | |
1585 | struct ub_scsi_cmd *scmd; | |
a1cf96ef | 1586 | struct scatterlist *sg; |
1da177e4 LT |
1587 | int rc; |
1588 | ||
1589 | if (cmd->cdb[0] == REQUEST_SENSE) { | |
1590 | rc = -EPIPE; | |
1591 | goto error; | |
1592 | } | |
1593 | ||
1594 | scmd = &sc->top_rqs_cmd; | |
a1cf96ef | 1595 | memset(scmd, 0, sizeof(struct ub_scsi_cmd)); |
1da177e4 LT |
1596 | scmd->cdb[0] = REQUEST_SENSE; |
1597 | scmd->cdb[4] = UB_SENSE_SIZE; | |
1598 | scmd->cdb_len = 6; | |
1599 | scmd->dir = UB_DIR_READ; | |
1600 | scmd->state = UB_CMDST_INIT; | |
a1cf96ef PZ |
1601 | scmd->nsg = 1; |
1602 | sg = &scmd->sgv[0]; | |
1603 | sg->page = virt_to_page(sc->top_sense); | |
38ffdd62 | 1604 | sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1); |
a1cf96ef | 1605 | sg->length = UB_SENSE_SIZE; |
1da177e4 | 1606 | scmd->len = UB_SENSE_SIZE; |
f4800078 | 1607 | scmd->lun = cmd->lun; |
1da177e4 LT |
1608 | scmd->done = ub_top_sense_done; |
1609 | scmd->back = cmd; | |
1610 | ||
1611 | scmd->tag = sc->tagcnt++; | |
1612 | ||
1613 | cmd->state = UB_CMDST_SENSE; | |
1614 | ub_cmdtr_state(sc, cmd); | |
1615 | ||
1616 | ub_cmdq_insert(sc, scmd); | |
1617 | return; | |
1618 | ||
1619 | error: | |
1620 | ub_state_done(sc, cmd, rc); | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * A helper for the command's state machine: | |
1625 | * Submit a stall clear. | |
1626 | */ | |
1627 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
1628 | int stalled_pipe) | |
1629 | { | |
1630 | int endp; | |
1631 | struct usb_ctrlrequest *cr; | |
1632 | int rc; | |
1633 | ||
1634 | endp = usb_pipeendpoint(stalled_pipe); | |
1635 | if (usb_pipein (stalled_pipe)) | |
1636 | endp |= USB_DIR_IN; | |
1637 | ||
1638 | cr = &sc->work_cr; | |
1639 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
1640 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
1641 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
1642 | cr->wIndex = cpu_to_le16(endp); | |
1643 | cr->wLength = cpu_to_le16(0); | |
1644 | ||
1645 | UB_INIT_COMPLETION(sc->work_done); | |
1646 | ||
1647 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1648 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); | |
1da177e4 LT |
1649 | sc->work_urb.actual_length = 0; |
1650 | sc->work_urb.error_count = 0; | |
1651 | sc->work_urb.status = 0; | |
1652 | ||
1653 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1654 | ub_complete(&sc->work_done); | |
1655 | return rc; | |
1656 | } | |
1657 | ||
1658 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1659 | add_timer(&sc->work_timer); | |
1660 | return 0; | |
1661 | } | |
1662 | ||
1663 | /* | |
1664 | */ | |
1665 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) | |
1666 | { | |
a1cf96ef | 1667 | unsigned char *sense = sc->top_sense; |
1da177e4 LT |
1668 | struct ub_scsi_cmd *cmd; |
1669 | ||
1670 | /* | |
1671 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. | |
1672 | */ | |
1673 | ub_cmdtr_sense(sc, scmd, sense); | |
1674 | ||
1675 | /* | |
1676 | * Find the command which triggered the unit attention or a check, | |
1677 | * save the sense into it, and advance its state machine. | |
1678 | */ | |
1679 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { | |
1680 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); | |
1681 | return; | |
1682 | } | |
1683 | if (cmd != scmd->back) { | |
1684 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1685 | "sense done for wrong command 0x%x\n", |
1686 | sc->name, cmd->tag); | |
1da177e4 LT |
1687 | return; |
1688 | } | |
1689 | if (cmd->state != UB_CMDST_SENSE) { | |
1690 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1691 | "sense done with bad cmd state %d\n", |
1692 | sc->name, cmd->state); | |
1da177e4 LT |
1693 | return; |
1694 | } | |
1695 | ||
1696 | cmd->key = sense[2] & 0x0F; | |
1697 | cmd->asc = sense[12]; | |
1698 | cmd->ascq = sense[13]; | |
1699 | ||
1700 | ub_scsi_urb_compl(sc, cmd); | |
1701 | } | |
1702 | ||
2c26c9e6 PZ |
1703 | /* |
1704 | * Reset management | |
2c2e4a2e PZ |
1705 | * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing. |
1706 | * XXX Make usb_sync_reset asynchronous. | |
2c26c9e6 PZ |
1707 | */ |
1708 | ||
2c2e4a2e | 1709 | static void ub_reset_enter(struct ub_dev *sc, int try) |
2c26c9e6 PZ |
1710 | { |
1711 | ||
1712 | if (sc->reset) { | |
1713 | /* This happens often on multi-LUN devices. */ | |
1714 | return; | |
1715 | } | |
2c2e4a2e | 1716 | sc->reset = try + 1; |
2c26c9e6 PZ |
1717 | |
1718 | #if 0 /* Not needed because the disconnect waits for us. */ | |
1719 | unsigned long flags; | |
1720 | spin_lock_irqsave(&ub_lock, flags); | |
1721 | sc->openc++; | |
1722 | spin_unlock_irqrestore(&ub_lock, flags); | |
1723 | #endif | |
1724 | ||
1725 | #if 0 /* We let them stop themselves. */ | |
1726 | struct list_head *p; | |
1727 | struct ub_lun *lun; | |
1728 | list_for_each(p, &sc->luns) { | |
1729 | lun = list_entry(p, struct ub_lun, link); | |
1730 | blk_stop_queue(lun->disk->queue); | |
1731 | } | |
1732 | #endif | |
1733 | ||
1734 | schedule_work(&sc->reset_work); | |
1735 | } | |
1736 | ||
1737 | static void ub_reset_task(void *arg) | |
1738 | { | |
1739 | struct ub_dev *sc = arg; | |
1740 | unsigned long flags; | |
1741 | struct list_head *p; | |
1742 | struct ub_lun *lun; | |
1743 | int lkr, rc; | |
1744 | ||
1745 | if (!sc->reset) { | |
1746 | printk(KERN_WARNING "%s: Running reset unrequested\n", | |
1747 | sc->name); | |
1748 | return; | |
1749 | } | |
1750 | ||
1751 | if (atomic_read(&sc->poison)) { | |
1752 | printk(KERN_NOTICE "%s: Not resetting disconnected device\n", | |
1753 | sc->name); /* P3 This floods. Remove soon. XXX */ | |
2c2e4a2e PZ |
1754 | } else if ((sc->reset & 1) == 0) { |
1755 | ub_sync_reset(sc); | |
1756 | msleep(700); /* usb-storage sleeps 6s (!) */ | |
1757 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
1758 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
2c26c9e6 PZ |
1759 | } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) { |
1760 | printk(KERN_NOTICE "%s: Not resetting multi-interface device\n", | |
1761 | sc->name); /* P3 This floods. Remove soon. XXX */ | |
1762 | } else { | |
1763 | if ((lkr = usb_lock_device_for_reset(sc->dev, sc->intf)) < 0) { | |
1764 | printk(KERN_NOTICE | |
1765 | "%s: usb_lock_device_for_reset failed (%d)\n", | |
1766 | sc->name, lkr); | |
1767 | } else { | |
1768 | rc = usb_reset_device(sc->dev); | |
1769 | if (rc < 0) { | |
1770 | printk(KERN_NOTICE "%s: " | |
1771 | "usb_lock_device_for_reset failed (%d)\n", | |
1772 | sc->name, rc); | |
1773 | } | |
1774 | ||
1775 | if (lkr) | |
1776 | usb_unlock_device(sc->dev); | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | /* | |
1781 | * In theory, no commands can be running while reset is active, | |
1782 | * so nobody can ask for another reset, and so we do not need any | |
1783 | * queues of resets or anything. We do need a spinlock though, | |
1784 | * to interact with block layer. | |
1785 | */ | |
65b4fe55 | 1786 | spin_lock_irqsave(sc->lock, flags); |
2c26c9e6 PZ |
1787 | sc->reset = 0; |
1788 | tasklet_schedule(&sc->tasklet); | |
1789 | list_for_each(p, &sc->luns) { | |
1790 | lun = list_entry(p, struct ub_lun, link); | |
1791 | blk_start_queue(lun->disk->queue); | |
1792 | } | |
1793 | wake_up(&sc->reset_wait); | |
65b4fe55 | 1794 | spin_unlock_irqrestore(sc->lock, flags); |
2c26c9e6 PZ |
1795 | } |
1796 | ||
1da177e4 LT |
1797 | /* |
1798 | * This is called from a process context. | |
1799 | */ | |
f4800078 | 1800 | static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) |
1da177e4 LT |
1801 | { |
1802 | ||
f4800078 | 1803 | lun->readonly = 0; /* XXX Query this from the device */ |
1da177e4 | 1804 | |
f4800078 PZ |
1805 | lun->capacity.nsec = 0; |
1806 | lun->capacity.bsize = 512; | |
1807 | lun->capacity.bshift = 0; | |
1da177e4 | 1808 | |
f4800078 | 1809 | if (ub_sync_tur(sc, lun) != 0) |
1da177e4 | 1810 | return; /* Not ready */ |
f4800078 | 1811 | lun->changed = 0; |
1da177e4 | 1812 | |
f4800078 | 1813 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
1da177e4 LT |
1814 | /* |
1815 | * The retry here means something is wrong, either with the | |
1816 | * device, with the transport, or with our code. | |
1817 | * We keep this because sd.c has retries for capacity. | |
1818 | */ | |
f4800078 PZ |
1819 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
1820 | lun->capacity.nsec = 0; | |
1821 | lun->capacity.bsize = 512; | |
1822 | lun->capacity.bshift = 0; | |
1da177e4 LT |
1823 | } |
1824 | } | |
1825 | } | |
1826 | ||
1827 | /* | |
1828 | * The open funcion. | |
1829 | * This is mostly needed to keep refcounting, but also to support | |
1830 | * media checks on removable media drives. | |
1831 | */ | |
1832 | static int ub_bd_open(struct inode *inode, struct file *filp) | |
1833 | { | |
1834 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
f4800078 | 1835 | struct ub_lun *lun; |
1da177e4 LT |
1836 | struct ub_dev *sc; |
1837 | unsigned long flags; | |
1838 | int rc; | |
1839 | ||
f4800078 | 1840 | if ((lun = disk->private_data) == NULL) |
1da177e4 | 1841 | return -ENXIO; |
f4800078 PZ |
1842 | sc = lun->udev; |
1843 | ||
1da177e4 LT |
1844 | spin_lock_irqsave(&ub_lock, flags); |
1845 | if (atomic_read(&sc->poison)) { | |
1846 | spin_unlock_irqrestore(&ub_lock, flags); | |
1847 | return -ENXIO; | |
1848 | } | |
1849 | sc->openc++; | |
1850 | spin_unlock_irqrestore(&ub_lock, flags); | |
1851 | ||
1852 | /* | |
1853 | * This is a workaround for a specific problem in our block layer. | |
1854 | * In 2.6.9, register_disk duplicates the code from rescan_partitions. | |
1855 | * However, if we do add_disk with a device which persistently reports | |
1856 | * a changed media, add_disk calls register_disk, which does do_open, | |
1857 | * which will call rescan_paritions for changed media. After that, | |
1858 | * register_disk attempts to do it all again and causes double kobject | |
1859 | * registration and a eventually an oops on module removal. | |
1860 | * | |
1861 | * The bottom line is, Al Viro says that we should not allow | |
1862 | * bdev->bd_invalidated to be set when doing add_disk no matter what. | |
1863 | */ | |
f4800078 PZ |
1864 | if (lun->first_open) { |
1865 | lun->first_open = 0; | |
1866 | if (lun->changed) { | |
1da177e4 LT |
1867 | rc = -ENOMEDIUM; |
1868 | goto err_open; | |
1869 | } | |
1870 | } | |
1871 | ||
f4800078 | 1872 | if (lun->removable || lun->readonly) |
1da177e4 LT |
1873 | check_disk_change(inode->i_bdev); |
1874 | ||
1875 | /* | |
1876 | * The sd.c considers ->media_present and ->changed not equivalent, | |
1877 | * under some pretty murky conditions (a failure of READ CAPACITY). | |
1878 | * We may need it one day. | |
1879 | */ | |
f4800078 | 1880 | if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) { |
1da177e4 LT |
1881 | rc = -ENOMEDIUM; |
1882 | goto err_open; | |
1883 | } | |
1884 | ||
f4800078 | 1885 | if (lun->readonly && (filp->f_mode & FMODE_WRITE)) { |
1da177e4 LT |
1886 | rc = -EROFS; |
1887 | goto err_open; | |
1888 | } | |
1889 | ||
1890 | return 0; | |
1891 | ||
1892 | err_open: | |
1893 | ub_put(sc); | |
1894 | return rc; | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | */ | |
1899 | static int ub_bd_release(struct inode *inode, struct file *filp) | |
1900 | { | |
1901 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
f4800078 PZ |
1902 | struct ub_lun *lun = disk->private_data; |
1903 | struct ub_dev *sc = lun->udev; | |
1da177e4 LT |
1904 | |
1905 | ub_put(sc); | |
1906 | return 0; | |
1907 | } | |
1908 | ||
1909 | /* | |
1910 | * The ioctl interface. | |
1911 | */ | |
1912 | static int ub_bd_ioctl(struct inode *inode, struct file *filp, | |
1913 | unsigned int cmd, unsigned long arg) | |
1914 | { | |
1915 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
1916 | void __user *usermem = (void __user *) arg; | |
1917 | ||
1918 | return scsi_cmd_ioctl(filp, disk, cmd, usermem); | |
1919 | } | |
1920 | ||
1921 | /* | |
1922 | * This is called once a new disk was seen by the block layer or by ub_probe(). | |
1923 | * The main onjective here is to discover the features of the media such as | |
1924 | * the capacity, read-only status, etc. USB storage generally does not | |
1925 | * need to be spun up, but if we needed it, this would be the place. | |
1926 | * | |
1927 | * This call can sleep. | |
1928 | * | |
1929 | * The return code is not used. | |
1930 | */ | |
1931 | static int ub_bd_revalidate(struct gendisk *disk) | |
1932 | { | |
f4800078 PZ |
1933 | struct ub_lun *lun = disk->private_data; |
1934 | ||
1935 | ub_revalidate(lun->udev, lun); | |
1da177e4 LT |
1936 | |
1937 | /* XXX Support sector size switching like in sr.c */ | |
f4800078 PZ |
1938 | blk_queue_hardsect_size(disk->queue, lun->capacity.bsize); |
1939 | set_capacity(disk, lun->capacity.nsec); | |
1940 | // set_disk_ro(sdkp->disk, lun->readonly); | |
1da177e4 LT |
1941 | |
1942 | return 0; | |
1943 | } | |
1944 | ||
1945 | /* | |
1946 | * The check is called by the block layer to verify if the media | |
1947 | * is still available. It is supposed to be harmless, lightweight and | |
1948 | * non-intrusive in case the media was not changed. | |
1949 | * | |
1950 | * This call can sleep. | |
1951 | * | |
1952 | * The return code is bool! | |
1953 | */ | |
1954 | static int ub_bd_media_changed(struct gendisk *disk) | |
1955 | { | |
f4800078 | 1956 | struct ub_lun *lun = disk->private_data; |
1da177e4 | 1957 | |
f4800078 | 1958 | if (!lun->removable) |
1da177e4 LT |
1959 | return 0; |
1960 | ||
1961 | /* | |
1962 | * We clean checks always after every command, so this is not | |
1963 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, | |
1964 | * the device is actually not ready with operator or software | |
1965 | * intervention required. One dangerous item might be a drive which | |
1966 | * spins itself down, and come the time to write dirty pages, this | |
1967 | * will fail, then block layer discards the data. Since we never | |
1968 | * spin drives up, such devices simply cannot be used with ub anyway. | |
1969 | */ | |
f4800078 PZ |
1970 | if (ub_sync_tur(lun->udev, lun) != 0) { |
1971 | lun->changed = 1; | |
1da177e4 LT |
1972 | return 1; |
1973 | } | |
1974 | ||
f4800078 | 1975 | return lun->changed; |
1da177e4 LT |
1976 | } |
1977 | ||
1978 | static struct block_device_operations ub_bd_fops = { | |
1979 | .owner = THIS_MODULE, | |
1980 | .open = ub_bd_open, | |
1981 | .release = ub_bd_release, | |
1982 | .ioctl = ub_bd_ioctl, | |
1983 | .media_changed = ub_bd_media_changed, | |
1984 | .revalidate_disk = ub_bd_revalidate, | |
1985 | }; | |
1986 | ||
1987 | /* | |
1988 | * Common ->done routine for commands executed synchronously. | |
1989 | */ | |
1990 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1991 | { | |
1992 | struct completion *cop = cmd->back; | |
1993 | complete(cop); | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Test if the device has a check condition on it, synchronously. | |
1998 | */ | |
f4800078 | 1999 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) |
1da177e4 LT |
2000 | { |
2001 | struct ub_scsi_cmd *cmd; | |
2002 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; | |
2003 | unsigned long flags; | |
2004 | struct completion compl; | |
2005 | int rc; | |
2006 | ||
2007 | init_completion(&compl); | |
2008 | ||
2009 | rc = -ENOMEM; | |
2010 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
2011 | goto err_alloc; | |
2012 | memset(cmd, 0, ALLOC_SIZE); | |
2013 | ||
2014 | cmd->cdb[0] = TEST_UNIT_READY; | |
2015 | cmd->cdb_len = 6; | |
2016 | cmd->dir = UB_DIR_NONE; | |
2017 | cmd->state = UB_CMDST_INIT; | |
f4800078 | 2018 | cmd->lun = lun; /* This may be NULL, but that's ok */ |
1da177e4 LT |
2019 | cmd->done = ub_probe_done; |
2020 | cmd->back = &compl; | |
2021 | ||
65b4fe55 | 2022 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 LT |
2023 | cmd->tag = sc->tagcnt++; |
2024 | ||
2025 | rc = ub_submit_scsi(sc, cmd); | |
65b4fe55 | 2026 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
2027 | |
2028 | if (rc != 0) { | |
2029 | printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */ | |
2030 | goto err_submit; | |
2031 | } | |
2032 | ||
2033 | wait_for_completion(&compl); | |
2034 | ||
2035 | rc = cmd->error; | |
2036 | ||
2037 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ | |
2038 | rc = cmd->key; | |
2039 | ||
2040 | err_submit: | |
2041 | kfree(cmd); | |
2042 | err_alloc: | |
2043 | return rc; | |
2044 | } | |
2045 | ||
2046 | /* | |
2047 | * Read the SCSI capacity synchronously (for probing). | |
2048 | */ | |
f4800078 PZ |
2049 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
2050 | struct ub_capacity *ret) | |
1da177e4 LT |
2051 | { |
2052 | struct ub_scsi_cmd *cmd; | |
a1cf96ef | 2053 | struct scatterlist *sg; |
1da177e4 LT |
2054 | char *p; |
2055 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; | |
2056 | unsigned long flags; | |
2057 | unsigned int bsize, shift; | |
2058 | unsigned long nsec; | |
2059 | struct completion compl; | |
2060 | int rc; | |
2061 | ||
2062 | init_completion(&compl); | |
2063 | ||
2064 | rc = -ENOMEM; | |
2065 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
2066 | goto err_alloc; | |
2067 | memset(cmd, 0, ALLOC_SIZE); | |
2068 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); | |
2069 | ||
2070 | cmd->cdb[0] = 0x25; | |
2071 | cmd->cdb_len = 10; | |
2072 | cmd->dir = UB_DIR_READ; | |
2073 | cmd->state = UB_CMDST_INIT; | |
a1cf96ef PZ |
2074 | cmd->nsg = 1; |
2075 | sg = &cmd->sgv[0]; | |
2076 | sg->page = virt_to_page(p); | |
38ffdd62 | 2077 | sg->offset = (unsigned long)p & (PAGE_SIZE-1); |
a1cf96ef | 2078 | sg->length = 8; |
1da177e4 | 2079 | cmd->len = 8; |
f4800078 | 2080 | cmd->lun = lun; |
1da177e4 LT |
2081 | cmd->done = ub_probe_done; |
2082 | cmd->back = &compl; | |
2083 | ||
65b4fe55 | 2084 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 LT |
2085 | cmd->tag = sc->tagcnt++; |
2086 | ||
2087 | rc = ub_submit_scsi(sc, cmd); | |
65b4fe55 | 2088 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
2089 | |
2090 | if (rc != 0) { | |
2091 | printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */ | |
2092 | goto err_submit; | |
2093 | } | |
2094 | ||
2095 | wait_for_completion(&compl); | |
2096 | ||
2097 | if (cmd->error != 0) { | |
2098 | printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */ | |
2099 | rc = -EIO; | |
2100 | goto err_read; | |
2101 | } | |
2102 | if (cmd->act_len != 8) { | |
2103 | printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */ | |
2104 | rc = -EIO; | |
2105 | goto err_read; | |
2106 | } | |
2107 | ||
2108 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ | |
2109 | nsec = be32_to_cpu(*(__be32 *)p) + 1; | |
2110 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); | |
2111 | switch (bsize) { | |
2112 | case 512: shift = 0; break; | |
2113 | case 1024: shift = 1; break; | |
2114 | case 2048: shift = 2; break; | |
2115 | case 4096: shift = 3; break; | |
2116 | default: | |
2117 | printk("ub: Bad sector size %u\n", bsize); /* P3 */ | |
2118 | rc = -EDOM; | |
2119 | goto err_inv_bsize; | |
2120 | } | |
2121 | ||
2122 | ret->bsize = bsize; | |
2123 | ret->bshift = shift; | |
2124 | ret->nsec = nsec << shift; | |
2125 | rc = 0; | |
2126 | ||
2127 | err_inv_bsize: | |
2128 | err_read: | |
2129 | err_submit: | |
2130 | kfree(cmd); | |
2131 | err_alloc: | |
2132 | return rc; | |
2133 | } | |
2134 | ||
2135 | /* | |
2136 | */ | |
2137 | static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt) | |
2138 | { | |
2139 | struct completion *cop = urb->context; | |
2140 | complete(cop); | |
2141 | } | |
2142 | ||
2143 | static void ub_probe_timeout(unsigned long arg) | |
2144 | { | |
2145 | struct completion *cop = (struct completion *) arg; | |
2146 | complete(cop); | |
2147 | } | |
2148 | ||
2c2e4a2e PZ |
2149 | /* |
2150 | * Reset with a Bulk reset. | |
2151 | */ | |
2152 | static int ub_sync_reset(struct ub_dev *sc) | |
2153 | { | |
2154 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; | |
2155 | struct usb_ctrlrequest *cr; | |
2156 | struct completion compl; | |
2157 | struct timer_list timer; | |
2158 | int rc; | |
2159 | ||
2160 | init_completion(&compl); | |
2161 | ||
2162 | cr = &sc->work_cr; | |
2163 | cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
2164 | cr->bRequest = US_BULK_RESET_REQUEST; | |
2165 | cr->wValue = cpu_to_le16(0); | |
2166 | cr->wIndex = cpu_to_le16(ifnum); | |
2167 | cr->wLength = cpu_to_le16(0); | |
2168 | ||
2169 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
2170 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
2171 | sc->work_urb.actual_length = 0; | |
2172 | sc->work_urb.error_count = 0; | |
2173 | sc->work_urb.status = 0; | |
2174 | ||
2175 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
2176 | printk(KERN_WARNING | |
2177 | "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc); | |
2178 | return rc; | |
2179 | } | |
2180 | ||
2181 | init_timer(&timer); | |
2182 | timer.function = ub_probe_timeout; | |
2183 | timer.data = (unsigned long) &compl; | |
2184 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2185 | add_timer(&timer); | |
2186 | ||
2187 | wait_for_completion(&compl); | |
2188 | ||
2189 | del_timer_sync(&timer); | |
2190 | usb_kill_urb(&sc->work_urb); | |
2191 | ||
2192 | return sc->work_urb.status; | |
2193 | } | |
2194 | ||
f4800078 PZ |
2195 | /* |
2196 | * Get number of LUNs by the way of Bulk GetMaxLUN command. | |
2197 | */ | |
2198 | static int ub_sync_getmaxlun(struct ub_dev *sc) | |
2199 | { | |
2200 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; | |
2201 | unsigned char *p; | |
2202 | enum { ALLOC_SIZE = 1 }; | |
2203 | struct usb_ctrlrequest *cr; | |
2204 | struct completion compl; | |
2205 | struct timer_list timer; | |
2206 | int nluns; | |
2207 | int rc; | |
2208 | ||
2209 | init_completion(&compl); | |
2210 | ||
2211 | rc = -ENOMEM; | |
2212 | if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
2213 | goto err_alloc; | |
2214 | *p = 55; | |
2215 | ||
2216 | cr = &sc->work_cr; | |
2217 | cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
2218 | cr->bRequest = US_BULK_GET_MAX_LUN; | |
2219 | cr->wValue = cpu_to_le16(0); | |
2220 | cr->wIndex = cpu_to_le16(ifnum); | |
2221 | cr->wLength = cpu_to_le16(1); | |
2222 | ||
2223 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, | |
2224 | (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); | |
f4800078 PZ |
2225 | sc->work_urb.actual_length = 0; |
2226 | sc->work_urb.error_count = 0; | |
2227 | sc->work_urb.status = 0; | |
2228 | ||
2229 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
2230 | if (rc == -EPIPE) { | |
64bd8453 | 2231 | printk("%s: Stall submitting GetMaxLUN, using 1 LUN\n", |
f4800078 PZ |
2232 | sc->name); /* P3 */ |
2233 | } else { | |
64bd8453 | 2234 | printk(KERN_NOTICE |
f4800078 PZ |
2235 | "%s: Unable to submit GetMaxLUN (%d)\n", |
2236 | sc->name, rc); | |
2237 | } | |
2238 | goto err_submit; | |
2239 | } | |
2240 | ||
2241 | init_timer(&timer); | |
2242 | timer.function = ub_probe_timeout; | |
2243 | timer.data = (unsigned long) &compl; | |
2244 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2245 | add_timer(&timer); | |
2246 | ||
2247 | wait_for_completion(&compl); | |
2248 | ||
2249 | del_timer_sync(&timer); | |
2250 | usb_kill_urb(&sc->work_urb); | |
2251 | ||
64bd8453 PZ |
2252 | if ((rc = sc->work_urb.status) < 0) { |
2253 | if (rc == -EPIPE) { | |
2254 | printk("%s: Stall at GetMaxLUN, using 1 LUN\n", | |
2255 | sc->name); /* P3 */ | |
2256 | } else { | |
2257 | printk(KERN_NOTICE | |
2258 | "%s: Error at GetMaxLUN (%d)\n", | |
2259 | sc->name, rc); | |
2260 | } | |
2261 | goto err_io; | |
2262 | } | |
2263 | ||
f4800078 PZ |
2264 | if (sc->work_urb.actual_length != 1) { |
2265 | printk("%s: GetMaxLUN returned %d bytes\n", sc->name, | |
2266 | sc->work_urb.actual_length); /* P3 */ | |
2267 | nluns = 0; | |
2268 | } else { | |
2269 | if ((nluns = *p) == 55) { | |
2270 | nluns = 0; | |
2271 | } else { | |
2272 | /* GetMaxLUN returns the maximum LUN number */ | |
2273 | nluns += 1; | |
2274 | if (nluns > UB_MAX_LUNS) | |
2275 | nluns = UB_MAX_LUNS; | |
2276 | } | |
2277 | printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name, | |
2278 | *p, nluns); /* P3 */ | |
2279 | } | |
2280 | ||
2281 | kfree(p); | |
2282 | return nluns; | |
2283 | ||
64bd8453 | 2284 | err_io: |
f4800078 PZ |
2285 | err_submit: |
2286 | kfree(p); | |
2287 | err_alloc: | |
2288 | return rc; | |
2289 | } | |
2290 | ||
1da177e4 LT |
2291 | /* |
2292 | * Clear initial stalls. | |
2293 | */ | |
2294 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) | |
2295 | { | |
2296 | int endp; | |
2297 | struct usb_ctrlrequest *cr; | |
2298 | struct completion compl; | |
2299 | struct timer_list timer; | |
2300 | int rc; | |
2301 | ||
2302 | init_completion(&compl); | |
2303 | ||
2304 | endp = usb_pipeendpoint(stalled_pipe); | |
2305 | if (usb_pipein (stalled_pipe)) | |
2306 | endp |= USB_DIR_IN; | |
2307 | ||
2308 | cr = &sc->work_cr; | |
2309 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
2310 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
2311 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
2312 | cr->wIndex = cpu_to_le16(endp); | |
2313 | cr->wLength = cpu_to_le16(0); | |
2314 | ||
2315 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
2316 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
1da177e4 LT |
2317 | sc->work_urb.actual_length = 0; |
2318 | sc->work_urb.error_count = 0; | |
2319 | sc->work_urb.status = 0; | |
2320 | ||
2321 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
2322 | printk(KERN_WARNING | |
2323 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); | |
2324 | return rc; | |
2325 | } | |
2326 | ||
2327 | init_timer(&timer); | |
2328 | timer.function = ub_probe_timeout; | |
2329 | timer.data = (unsigned long) &compl; | |
2330 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2331 | add_timer(&timer); | |
2332 | ||
2333 | wait_for_completion(&compl); | |
2334 | ||
2335 | del_timer_sync(&timer); | |
2336 | usb_kill_urb(&sc->work_urb); | |
2337 | ||
2338 | /* reset the endpoint toggle */ | |
2339 | usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0); | |
2340 | ||
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * Get the pipe settings. | |
2346 | */ | |
2347 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, | |
2348 | struct usb_interface *intf) | |
2349 | { | |
2350 | struct usb_host_interface *altsetting = intf->cur_altsetting; | |
2351 | struct usb_endpoint_descriptor *ep_in = NULL; | |
2352 | struct usb_endpoint_descriptor *ep_out = NULL; | |
2353 | struct usb_endpoint_descriptor *ep; | |
2354 | int i; | |
2355 | ||
2356 | /* | |
2357 | * Find the endpoints we need. | |
2358 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
2359 | * We will ignore any others. | |
2360 | */ | |
2361 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
2362 | ep = &altsetting->endpoint[i].desc; | |
2363 | ||
2364 | /* Is it a BULK endpoint? */ | |
2365 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
2366 | == USB_ENDPOINT_XFER_BULK) { | |
2367 | /* BULK in or out? */ | |
2368 | if (ep->bEndpointAddress & USB_DIR_IN) | |
2369 | ep_in = ep; | |
2370 | else | |
2371 | ep_out = ep; | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | if (ep_in == NULL || ep_out == NULL) { | |
f4800078 PZ |
2376 | printk(KERN_NOTICE "%s: failed endpoint check\n", |
2377 | sc->name); | |
2c26c9e6 | 2378 | return -ENODEV; |
1da177e4 LT |
2379 | } |
2380 | ||
2381 | /* Calculate and store the pipe values */ | |
2382 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); | |
2383 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); | |
2384 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, | |
2385 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
2386 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, | |
2387 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
2388 | ||
2389 | return 0; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Probing is done in the process context, which allows us to cheat | |
2394 | * and not to build a state machine for the discovery. | |
2395 | */ | |
2396 | static int ub_probe(struct usb_interface *intf, | |
2397 | const struct usb_device_id *dev_id) | |
2398 | { | |
2399 | struct ub_dev *sc; | |
f4800078 | 2400 | int nluns; |
1da177e4 LT |
2401 | int rc; |
2402 | int i; | |
2403 | ||
a00828e9 PZ |
2404 | if (usb_usual_check_type(dev_id, USB_US_TYPE_UB)) |
2405 | return -ENXIO; | |
2406 | ||
1da177e4 LT |
2407 | rc = -ENOMEM; |
2408 | if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) | |
2409 | goto err_core; | |
2410 | memset(sc, 0, sizeof(struct ub_dev)); | |
65b4fe55 | 2411 | sc->lock = ub_next_lock(); |
f4800078 | 2412 | INIT_LIST_HEAD(&sc->luns); |
1da177e4 LT |
2413 | usb_init_urb(&sc->work_urb); |
2414 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); | |
2415 | atomic_set(&sc->poison, 0); | |
2c26c9e6 PZ |
2416 | INIT_WORK(&sc->reset_work, ub_reset_task, sc); |
2417 | init_waitqueue_head(&sc->reset_wait); | |
1da177e4 LT |
2418 | |
2419 | init_timer(&sc->work_timer); | |
2420 | sc->work_timer.data = (unsigned long) sc; | |
2421 | sc->work_timer.function = ub_urb_timeout; | |
2422 | ||
2423 | ub_init_completion(&sc->work_done); | |
2424 | sc->work_done.done = 1; /* A little yuk, but oh well... */ | |
2425 | ||
1da177e4 LT |
2426 | sc->dev = interface_to_usbdev(intf); |
2427 | sc->intf = intf; | |
2428 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
1da177e4 LT |
2429 | usb_set_intfdata(intf, sc); |
2430 | usb_get_dev(sc->dev); | |
2431 | // usb_get_intf(sc->intf); /* Do we need this? */ | |
2432 | ||
f4800078 PZ |
2433 | snprintf(sc->name, 12, DRV_NAME "(%d.%d)", |
2434 | sc->dev->bus->busnum, sc->dev->devnum); | |
2435 | ||
1da177e4 LT |
2436 | /* XXX Verify that we can handle the device (from descriptors) */ |
2437 | ||
2c26c9e6 PZ |
2438 | if (ub_get_pipes(sc, sc->dev, intf) != 0) |
2439 | goto err_dev_desc; | |
1da177e4 LT |
2440 | |
2441 | if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0) | |
2442 | goto err_diag; | |
2443 | ||
2444 | /* | |
2445 | * At this point, all USB initialization is done, do upper layer. | |
2446 | * We really hate halfway initialized structures, so from the | |
2447 | * invariants perspective, this ub_dev is fully constructed at | |
2448 | * this point. | |
2449 | */ | |
2450 | ||
2451 | /* | |
2452 | * This is needed to clear toggles. It is a problem only if we do | |
2453 | * `rmmod ub && modprobe ub` without disconnects, but we like that. | |
2454 | */ | |
c6c88834 | 2455 | #if 0 /* iPod Mini fails if we do this (big white iPod works) */ |
1da177e4 LT |
2456 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
2457 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
c6c88834 | 2458 | #endif |
1da177e4 LT |
2459 | |
2460 | /* | |
2461 | * The way this is used by the startup code is a little specific. | |
2462 | * A SCSI check causes a USB stall. Our common case code sees it | |
2463 | * and clears the check, after which the device is ready for use. | |
2464 | * But if a check was not present, any command other than | |
2465 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). | |
2466 | * | |
2467 | * If we neglect to clear the SCSI check, the first real command fails | |
2468 | * (which is the capacity readout). We clear that and retry, but why | |
2469 | * causing spurious retries for no reason. | |
2470 | * | |
2471 | * Revalidation may start with its own TEST_UNIT_READY, but that one | |
2472 | * has to succeed, so we clear checks with an additional one here. | |
2473 | * In any case it's not our business how revaliadation is implemented. | |
2474 | */ | |
2475 | for (i = 0; i < 3; i++) { /* Retries for benh's key */ | |
f4800078 | 2476 | if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; |
1da177e4 LT |
2477 | if (rc != 0x6) break; |
2478 | msleep(10); | |
2479 | } | |
2480 | ||
f4800078 PZ |
2481 | nluns = 1; |
2482 | for (i = 0; i < 3; i++) { | |
2483 | if ((rc = ub_sync_getmaxlun(sc)) < 0) { | |
2484 | /* | |
64bd8453 PZ |
2485 | * This segment is taken from usb-storage. They say |
2486 | * that ZIP-100 needs this, but my own ZIP-100 works | |
2487 | * fine without this. | |
2488 | * Still, it does not seem to hurt anything. | |
f4800078 PZ |
2489 | */ |
2490 | if (rc == -EPIPE) { | |
2491 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
2492 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
2493 | } | |
2494 | break; | |
2495 | } | |
2496 | if (rc != 0) { | |
2497 | nluns = rc; | |
2498 | break; | |
2499 | } | |
9f793d2c | 2500 | msleep(100); |
f4800078 | 2501 | } |
1da177e4 | 2502 | |
f4800078 PZ |
2503 | for (i = 0; i < nluns; i++) { |
2504 | ub_probe_lun(sc, i); | |
2505 | } | |
2506 | return 0; | |
2507 | ||
2508 | /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */ | |
2509 | err_diag: | |
2c26c9e6 | 2510 | err_dev_desc: |
f4800078 PZ |
2511 | usb_set_intfdata(intf, NULL); |
2512 | // usb_put_intf(sc->intf); | |
2513 | usb_put_dev(sc->dev); | |
2514 | kfree(sc); | |
2515 | err_core: | |
2516 | return rc; | |
2517 | } | |
2518 | ||
2519 | static int ub_probe_lun(struct ub_dev *sc, int lnum) | |
2520 | { | |
2521 | struct ub_lun *lun; | |
2522 | request_queue_t *q; | |
2523 | struct gendisk *disk; | |
2524 | int rc; | |
2525 | ||
2526 | rc = -ENOMEM; | |
2527 | if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) | |
2528 | goto err_alloc; | |
2529 | memset(lun, 0, sizeof(struct ub_lun)); | |
2530 | lun->num = lnum; | |
2531 | ||
2532 | rc = -ENOSR; | |
2533 | if ((lun->id = ub_id_get()) == -1) | |
2534 | goto err_id; | |
2535 | ||
2536 | lun->udev = sc; | |
2537 | list_add(&lun->link, &sc->luns); | |
2538 | ||
2539 | snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", | |
2540 | lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); | |
2541 | ||
2542 | lun->removable = 1; /* XXX Query this from the device */ | |
2543 | lun->changed = 1; /* ub_revalidate clears only */ | |
2544 | lun->first_open = 1; | |
2545 | ub_revalidate(sc, lun); | |
1da177e4 | 2546 | |
1da177e4 | 2547 | rc = -ENOMEM; |
4fb729f5 | 2548 | if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL) |
1da177e4 LT |
2549 | goto err_diskalloc; |
2550 | ||
f4800078 PZ |
2551 | lun->disk = disk; |
2552 | sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); | |
2553 | sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a'); | |
1da177e4 | 2554 | disk->major = UB_MAJOR; |
4fb729f5 | 2555 | disk->first_minor = lun->id * UB_PARTS_PER_LUN; |
1da177e4 | 2556 | disk->fops = &ub_bd_fops; |
f4800078 | 2557 | disk->private_data = lun; |
64bd8453 | 2558 | disk->driverfs_dev = &sc->intf->dev; |
1da177e4 LT |
2559 | |
2560 | rc = -ENOMEM; | |
65b4fe55 | 2561 | if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL) |
1da177e4 LT |
2562 | goto err_blkqinit; |
2563 | ||
2564 | disk->queue = q; | |
2565 | ||
f4800078 | 2566 | blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); |
1da177e4 LT |
2567 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); |
2568 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); | |
f4800078 | 2569 | blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ |
1da177e4 | 2570 | blk_queue_max_sectors(q, UB_MAX_SECTORS); |
f4800078 | 2571 | blk_queue_hardsect_size(q, lun->capacity.bsize); |
1da177e4 | 2572 | |
f4800078 | 2573 | q->queuedata = lun; |
1da177e4 | 2574 | |
f4800078 PZ |
2575 | set_capacity(disk, lun->capacity.nsec); |
2576 | if (lun->removable) | |
1da177e4 LT |
2577 | disk->flags |= GENHD_FL_REMOVABLE; |
2578 | ||
2579 | add_disk(disk); | |
2580 | ||
2581 | return 0; | |
2582 | ||
2583 | err_blkqinit: | |
2584 | put_disk(disk); | |
2585 | err_diskalloc: | |
f4800078 PZ |
2586 | list_del(&lun->link); |
2587 | ub_id_put(lun->id); | |
1da177e4 | 2588 | err_id: |
f4800078 PZ |
2589 | kfree(lun); |
2590 | err_alloc: | |
1da177e4 LT |
2591 | return rc; |
2592 | } | |
2593 | ||
2594 | static void ub_disconnect(struct usb_interface *intf) | |
2595 | { | |
2596 | struct ub_dev *sc = usb_get_intfdata(intf); | |
f4800078 PZ |
2597 | struct list_head *p; |
2598 | struct ub_lun *lun; | |
2599 | struct gendisk *disk; | |
1da177e4 LT |
2600 | unsigned long flags; |
2601 | ||
2602 | /* | |
2603 | * Prevent ub_bd_release from pulling the rug from under us. | |
2604 | * XXX This is starting to look like a kref. | |
2605 | * XXX Why not to take this ref at probe time? | |
2606 | */ | |
2607 | spin_lock_irqsave(&ub_lock, flags); | |
2608 | sc->openc++; | |
2609 | spin_unlock_irqrestore(&ub_lock, flags); | |
2610 | ||
2611 | /* | |
2612 | * Fence stall clearnings, operations triggered by unlinkings and so on. | |
2613 | * We do not attempt to unlink any URBs, because we do not trust the | |
2614 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. | |
2615 | */ | |
2616 | atomic_set(&sc->poison, 1); | |
2617 | ||
2c26c9e6 PZ |
2618 | /* |
2619 | * Wait for reset to end, if any. | |
2620 | */ | |
2621 | wait_event(sc->reset_wait, !sc->reset); | |
2622 | ||
1da177e4 LT |
2623 | /* |
2624 | * Blow away queued commands. | |
2625 | * | |
2626 | * Actually, this never works, because before we get here | |
2627 | * the HCD terminates outstanding URB(s). It causes our | |
2628 | * SCSI command queue to advance, commands fail to submit, | |
2629 | * and the whole queue drains. So, we just use this code to | |
2630 | * print warnings. | |
2631 | */ | |
65b4fe55 | 2632 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 LT |
2633 | { |
2634 | struct ub_scsi_cmd *cmd; | |
2635 | int cnt = 0; | |
2c26c9e6 | 2636 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { |
1da177e4 LT |
2637 | cmd->error = -ENOTCONN; |
2638 | cmd->state = UB_CMDST_DONE; | |
2639 | ub_cmdtr_state(sc, cmd); | |
2640 | ub_cmdq_pop(sc); | |
2641 | (*cmd->done)(sc, cmd); | |
2642 | cnt++; | |
2643 | } | |
2644 | if (cnt != 0) { | |
2645 | printk(KERN_WARNING "%s: " | |
2646 | "%d was queued after shutdown\n", sc->name, cnt); | |
2647 | } | |
2648 | } | |
65b4fe55 | 2649 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
2650 | |
2651 | /* | |
2652 | * Unregister the upper layer. | |
2653 | */ | |
f4800078 PZ |
2654 | list_for_each (p, &sc->luns) { |
2655 | lun = list_entry(p, struct ub_lun, link); | |
2656 | disk = lun->disk; | |
2657 | if (disk->flags & GENHD_FL_UP) | |
2658 | del_gendisk(disk); | |
2659 | /* | |
2660 | * I wish I could do: | |
2661 | * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); | |
2662 | * As it is, we rely on our internal poisoning and let | |
2663 | * the upper levels to spin furiously failing all the I/O. | |
2664 | */ | |
2665 | } | |
1da177e4 LT |
2666 | |
2667 | /* | |
1da177e4 LT |
2668 | * Testing for -EINPROGRESS is always a bug, so we are bending |
2669 | * the rules a little. | |
2670 | */ | |
65b4fe55 | 2671 | spin_lock_irqsave(sc->lock, flags); |
1da177e4 LT |
2672 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ |
2673 | printk(KERN_WARNING "%s: " | |
2674 | "URB is active after disconnect\n", sc->name); | |
2675 | } | |
65b4fe55 | 2676 | spin_unlock_irqrestore(sc->lock, flags); |
1da177e4 LT |
2677 | |
2678 | /* | |
2679 | * There is virtually no chance that other CPU runs times so long | |
2680 | * after ub_urb_complete should have called del_timer, but only if HCD | |
2681 | * didn't forget to deliver a callback on unlink. | |
2682 | */ | |
2683 | del_timer_sync(&sc->work_timer); | |
2684 | ||
2685 | /* | |
2686 | * At this point there must be no commands coming from anyone | |
2687 | * and no URBs left in transit. | |
2688 | */ | |
2689 | ||
2690 | device_remove_file(&sc->intf->dev, &dev_attr_diag); | |
2691 | usb_set_intfdata(intf, NULL); | |
2692 | // usb_put_intf(sc->intf); | |
2693 | sc->intf = NULL; | |
2694 | usb_put_dev(sc->dev); | |
2695 | sc->dev = NULL; | |
2696 | ||
2697 | ub_put(sc); | |
2698 | } | |
2699 | ||
2700 | static struct usb_driver ub_driver = { | |
1da177e4 LT |
2701 | .name = "ub", |
2702 | .probe = ub_probe, | |
2703 | .disconnect = ub_disconnect, | |
2704 | .id_table = ub_usb_ids, | |
2705 | }; | |
2706 | ||
2707 | static int __init ub_init(void) | |
2708 | { | |
2709 | int rc; | |
65b4fe55 PZ |
2710 | int i; |
2711 | ||
2712 | for (i = 0; i < UB_QLOCK_NUM; i++) | |
2713 | spin_lock_init(&ub_qlockv[i]); | |
1da177e4 | 2714 | |
1da177e4 LT |
2715 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) |
2716 | goto err_regblkdev; | |
2717 | devfs_mk_dir(DEVFS_NAME); | |
2718 | ||
2719 | if ((rc = usb_register(&ub_driver)) != 0) | |
2720 | goto err_register; | |
2721 | ||
a00828e9 | 2722 | usb_usual_set_present(USB_US_TYPE_UB); |
1da177e4 LT |
2723 | return 0; |
2724 | ||
2725 | err_register: | |
2726 | devfs_remove(DEVFS_NAME); | |
2727 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2728 | err_regblkdev: | |
2729 | return rc; | |
2730 | } | |
2731 | ||
2732 | static void __exit ub_exit(void) | |
2733 | { | |
2734 | usb_deregister(&ub_driver); | |
2735 | ||
2736 | devfs_remove(DEVFS_NAME); | |
2737 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
a00828e9 | 2738 | usb_usual_clear_present(USB_US_TYPE_UB); |
1da177e4 LT |
2739 | } |
2740 | ||
2741 | module_init(ub_init); | |
2742 | module_exit(ub_exit); | |
2743 | ||
2744 | MODULE_LICENSE("GPL"); |