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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) | |
11 | * -- Return sense now that rq allows it (we always auto-sense anyway). | |
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) | |
14 | * -- verify the 13 conditions and do bulk resets | |
15 | * -- highmem | |
16 | * -- move top_sense and work_bcs into separate allocations (if they survive) | |
17 | * for cache purists and esoteric architectures. | |
18 | * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ? | |
19 | * -- prune comments, they are too volumnous | |
20 | * -- Resove XXX's | |
21 | * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. | |
22 | */ | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/usb.h> | |
26 | #include <linux/usb_usual.h> | |
27 | #include <linux/blkdev.h> | |
28 | #include <linux/timer.h> | |
29 | #include <linux/scatterlist.h> | |
30 | #include <scsi/scsi.h> | |
31 | ||
32 | #define DRV_NAME "ub" | |
33 | ||
34 | #define UB_MAJOR 180 | |
35 | ||
36 | /* | |
37 | * The command state machine is the key model for understanding of this driver. | |
38 | * | |
39 | * The general rule is that all transitions are done towards the bottom | |
40 | * of the diagram, thus preventing any loops. | |
41 | * | |
42 | * An exception to that is how the STAT state is handled. A counter allows it | |
43 | * to be re-entered along the path marked with [C]. | |
44 | * | |
45 | * +--------+ | |
46 | * ! INIT ! | |
47 | * +--------+ | |
48 | * ! | |
49 | * ub_scsi_cmd_start fails ->--------------------------------------\ | |
50 | * ! ! | |
51 | * V ! | |
52 | * +--------+ ! | |
53 | * ! CMD ! ! | |
54 | * +--------+ ! | |
55 | * ! +--------+ ! | |
56 | * was -EPIPE -->-------------------------------->! CLEAR ! ! | |
57 | * ! +--------+ ! | |
58 | * ! ! ! | |
59 | * was error -->------------------------------------- ! --------->\ | |
60 | * ! ! ! | |
61 | * /--<-- cmd->dir == NONE ? ! ! | |
62 | * ! ! ! ! | |
63 | * ! V ! ! | |
64 | * ! +--------+ ! ! | |
65 | * ! ! DATA ! ! ! | |
66 | * ! +--------+ ! ! | |
67 | * ! ! +---------+ ! ! | |
68 | * ! was -EPIPE -->--------------->! CLR2STS ! ! ! | |
69 | * ! ! +---------+ ! ! | |
70 | * ! ! ! ! ! | |
71 | * ! ! was error -->---- ! --------->\ | |
72 | * ! was error -->--------------------- ! ------------- ! --------->\ | |
73 | * ! ! ! ! ! | |
74 | * ! V ! ! ! | |
75 | * \--->+--------+ ! ! ! | |
76 | * ! STAT !<--------------------------/ ! ! | |
77 | * /--->+--------+ ! ! | |
78 | * ! ! ! ! | |
79 | * [C] was -EPIPE -->-----------\ ! ! | |
80 | * ! ! ! ! ! | |
81 | * +<---- len == 0 ! ! ! | |
82 | * ! ! ! ! ! | |
83 | * ! was error -->--------------------------------------!---------->\ | |
84 | * ! ! ! ! ! | |
85 | * +<---- bad CSW ! ! ! | |
86 | * +<---- bad tag ! ! ! | |
87 | * ! ! V ! ! | |
88 | * ! ! +--------+ ! ! | |
89 | * ! ! ! CLRRS ! ! ! | |
90 | * ! ! +--------+ ! ! | |
91 | * ! ! ! ! ! | |
92 | * \------- ! --------------------[C]--------\ ! ! | |
93 | * ! ! ! ! | |
94 | * cmd->error---\ +--------+ ! ! | |
95 | * ! +--------------->! SENSE !<----------/ ! | |
96 | * STAT_FAIL----/ +--------+ ! | |
97 | * ! ! V | |
98 | * ! V +--------+ | |
99 | * \--------------------------------\--------------------->! DONE ! | |
100 | * +--------+ | |
101 | */ | |
102 | ||
103 | /* | |
104 | * This many LUNs per USB device. | |
105 | * Every one of them takes a host, see UB_MAX_HOSTS. | |
106 | */ | |
107 | #define UB_MAX_LUNS 9 | |
108 | ||
109 | /* | |
110 | */ | |
111 | ||
112 | #define UB_PARTS_PER_LUN 8 | |
113 | ||
114 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ | |
115 | ||
116 | #define UB_SENSE_SIZE 18 | |
117 | ||
118 | /* | |
119 | */ | |
120 | ||
121 | /* command block wrapper */ | |
122 | struct bulk_cb_wrap { | |
123 | __le32 Signature; /* contains 'USBC' */ | |
124 | u32 Tag; /* unique per command id */ | |
125 | __le32 DataTransferLength; /* size of data */ | |
126 | u8 Flags; /* direction in bit 0 */ | |
127 | u8 Lun; /* LUN */ | |
128 | u8 Length; /* of of the CDB */ | |
129 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ | |
130 | }; | |
131 | ||
132 | #define US_BULK_CB_WRAP_LEN 31 | |
133 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ | |
134 | #define US_BULK_FLAG_IN 1 | |
135 | #define US_BULK_FLAG_OUT 0 | |
136 | ||
137 | /* command status wrapper */ | |
138 | struct bulk_cs_wrap { | |
139 | __le32 Signature; /* should = 'USBS' */ | |
140 | u32 Tag; /* same as original command */ | |
141 | __le32 Residue; /* amount not transferred */ | |
142 | u8 Status; /* see below */ | |
143 | }; | |
144 | ||
145 | #define US_BULK_CS_WRAP_LEN 13 | |
146 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ | |
147 | #define US_BULK_STAT_OK 0 | |
148 | #define US_BULK_STAT_FAIL 1 | |
149 | #define US_BULK_STAT_PHASE 2 | |
150 | ||
151 | /* bulk-only class specific requests */ | |
152 | #define US_BULK_RESET_REQUEST 0xff | |
153 | #define US_BULK_GET_MAX_LUN 0xfe | |
154 | ||
155 | /* | |
156 | */ | |
157 | struct ub_dev; | |
158 | ||
159 | #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */ | |
160 | #define UB_MAX_SECTORS 64 | |
161 | ||
162 | /* | |
163 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) | |
164 | * even if a webcam hogs the bus, but some devices need time to spin up. | |
165 | */ | |
166 | #define UB_URB_TIMEOUT (HZ*2) | |
167 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ | |
168 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ | |
169 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ | |
170 | ||
171 | /* | |
172 | * An instance of a SCSI command in transit. | |
173 | */ | |
174 | #define UB_DIR_NONE 0 | |
175 | #define UB_DIR_READ 1 | |
176 | #define UB_DIR_ILLEGAL2 2 | |
177 | #define UB_DIR_WRITE 3 | |
178 | ||
179 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ | |
180 | (((c)==UB_DIR_READ)? 'r': 'n')) | |
181 | ||
182 | enum ub_scsi_cmd_state { | |
183 | UB_CMDST_INIT, /* Initial state */ | |
184 | UB_CMDST_CMD, /* Command submitted */ | |
185 | UB_CMDST_DATA, /* Data phase */ | |
186 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ | |
187 | UB_CMDST_STAT, /* Status phase */ | |
188 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ | |
189 | UB_CMDST_CLRRS, /* Clearing before retrying status */ | |
190 | UB_CMDST_SENSE, /* Sending Request Sense */ | |
191 | UB_CMDST_DONE /* Final state */ | |
192 | }; | |
193 | ||
194 | struct ub_scsi_cmd { | |
195 | unsigned char cdb[UB_MAX_CDB_SIZE]; | |
196 | unsigned char cdb_len; | |
197 | ||
198 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ | |
199 | enum ub_scsi_cmd_state state; | |
200 | unsigned int tag; | |
201 | struct ub_scsi_cmd *next; | |
202 | ||
203 | int error; /* Return code - valid upon done */ | |
204 | unsigned int act_len; /* Return size */ | |
205 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ | |
206 | ||
207 | int stat_count; /* Retries getting status. */ | |
208 | unsigned int timeo; /* jiffies until rq->timeout changes */ | |
209 | ||
210 | unsigned int len; /* Requested length */ | |
211 | unsigned int current_sg; | |
212 | unsigned int nsg; /* sgv[nsg] */ | |
213 | struct scatterlist sgv[UB_MAX_REQ_SG]; | |
214 | ||
215 | struct ub_lun *lun; | |
216 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); | |
217 | void *back; | |
218 | }; | |
219 | ||
220 | struct ub_request { | |
221 | struct request *rq; | |
222 | unsigned int current_try; | |
223 | unsigned int nsg; /* sgv[nsg] */ | |
224 | struct scatterlist sgv[UB_MAX_REQ_SG]; | |
225 | }; | |
226 | ||
227 | /* | |
228 | */ | |
229 | struct ub_capacity { | |
230 | unsigned long nsec; /* Linux size - 512 byte sectors */ | |
231 | unsigned int bsize; /* Linux hardsect_size */ | |
232 | unsigned int bshift; /* Shift between 512 and hard sects */ | |
233 | }; | |
234 | ||
235 | /* | |
236 | * This is a direct take-off from linux/include/completion.h | |
237 | * The difference is that I do not wait on this thing, just poll. | |
238 | * When I want to wait (ub_probe), I just use the stock completion. | |
239 | * | |
240 | * Note that INIT_COMPLETION takes no lock. It is correct. But why | |
241 | * in the bloody hell that thing takes struct instead of pointer to struct | |
242 | * is quite beyond me. I just copied it from the stock completion. | |
243 | */ | |
244 | struct ub_completion { | |
245 | unsigned int done; | |
246 | spinlock_t lock; | |
247 | }; | |
248 | ||
249 | static inline void ub_init_completion(struct ub_completion *x) | |
250 | { | |
251 | x->done = 0; | |
252 | spin_lock_init(&x->lock); | |
253 | } | |
254 | ||
255 | #define UB_INIT_COMPLETION(x) ((x).done = 0) | |
256 | ||
257 | static void ub_complete(struct ub_completion *x) | |
258 | { | |
259 | unsigned long flags; | |
260 | ||
261 | spin_lock_irqsave(&x->lock, flags); | |
262 | x->done++; | |
263 | spin_unlock_irqrestore(&x->lock, flags); | |
264 | } | |
265 | ||
266 | static int ub_is_completed(struct ub_completion *x) | |
267 | { | |
268 | unsigned long flags; | |
269 | int ret; | |
270 | ||
271 | spin_lock_irqsave(&x->lock, flags); | |
272 | ret = x->done; | |
273 | spin_unlock_irqrestore(&x->lock, flags); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | /* | |
278 | */ | |
279 | struct ub_scsi_cmd_queue { | |
280 | int qlen, qmax; | |
281 | struct ub_scsi_cmd *head, *tail; | |
282 | }; | |
283 | ||
284 | /* | |
285 | * The block device instance (one per LUN). | |
286 | */ | |
287 | struct ub_lun { | |
288 | struct ub_dev *udev; | |
289 | struct list_head link; | |
290 | struct gendisk *disk; | |
291 | int id; /* Host index */ | |
292 | int num; /* LUN number */ | |
293 | char name[16]; | |
294 | ||
295 | int changed; /* Media was changed */ | |
296 | int removable; | |
297 | int readonly; | |
298 | ||
299 | struct ub_request urq; | |
300 | ||
301 | /* Use Ingo's mempool if or when we have more than one command. */ | |
302 | /* | |
303 | * Currently we never need more than one command for the whole device. | |
304 | * However, giving every LUN a command is a cheap and automatic way | |
305 | * to enforce fairness between them. | |
306 | */ | |
307 | int cmda[1]; | |
308 | struct ub_scsi_cmd cmdv[1]; | |
309 | ||
310 | struct ub_capacity capacity; | |
311 | }; | |
312 | ||
313 | /* | |
314 | * The USB device instance. | |
315 | */ | |
316 | struct ub_dev { | |
317 | spinlock_t *lock; | |
318 | atomic_t poison; /* The USB device is disconnected */ | |
319 | int openc; /* protected by ub_lock! */ | |
320 | /* kref is too implicit for our taste */ | |
321 | int reset; /* Reset is running */ | |
322 | int bad_resid; | |
323 | unsigned int tagcnt; | |
324 | char name[12]; | |
325 | struct usb_device *dev; | |
326 | struct usb_interface *intf; | |
327 | ||
328 | struct list_head luns; | |
329 | ||
330 | unsigned int send_bulk_pipe; /* cached pipe values */ | |
331 | unsigned int recv_bulk_pipe; | |
332 | unsigned int send_ctrl_pipe; | |
333 | unsigned int recv_ctrl_pipe; | |
334 | ||
335 | struct tasklet_struct tasklet; | |
336 | ||
337 | struct ub_scsi_cmd_queue cmd_queue; | |
338 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ | |
339 | unsigned char top_sense[UB_SENSE_SIZE]; | |
340 | ||
341 | struct ub_completion work_done; | |
342 | struct urb work_urb; | |
343 | struct timer_list work_timer; | |
344 | int last_pipe; /* What might need clearing */ | |
345 | __le32 signature; /* Learned signature */ | |
346 | struct bulk_cb_wrap work_bcb; | |
347 | struct bulk_cs_wrap work_bcs; | |
348 | struct usb_ctrlrequest work_cr; | |
349 | ||
350 | struct work_struct reset_work; | |
351 | wait_queue_head_t reset_wait; | |
352 | }; | |
353 | ||
354 | /* | |
355 | */ | |
356 | static void ub_cleanup(struct ub_dev *sc); | |
357 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq); | |
358 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, | |
359 | struct ub_scsi_cmd *cmd, struct ub_request *urq); | |
360 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, | |
361 | struct ub_scsi_cmd *cmd, struct ub_request *urq); | |
362 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
363 | static void ub_end_rq(struct request *rq, unsigned int status, | |
364 | unsigned int cmd_len); | |
365 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, | |
366 | struct ub_request *urq, struct ub_scsi_cmd *cmd); | |
367 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
368 | static void ub_urb_complete(struct urb *urb); | |
369 | static void ub_scsi_action(unsigned long _dev); | |
370 | static void ub_scsi_dispatch(struct ub_dev *sc); | |
371 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
372 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
373 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); | |
374 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
375 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
376 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
377 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
378 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
379 | int stalled_pipe); | |
380 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); | |
381 | static void ub_reset_enter(struct ub_dev *sc, int try); | |
382 | static void ub_reset_task(struct work_struct *work); | |
383 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); | |
384 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, | |
385 | struct ub_capacity *ret); | |
386 | static int ub_sync_reset(struct ub_dev *sc); | |
387 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe); | |
388 | static int ub_probe_lun(struct ub_dev *sc, int lnum); | |
389 | ||
390 | /* | |
391 | */ | |
392 | #ifdef CONFIG_USB_LIBUSUAL | |
393 | ||
394 | #define ub_usb_ids usb_storage_usb_ids | |
395 | #else | |
396 | ||
397 | static struct usb_device_id ub_usb_ids[] = { | |
398 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, | |
399 | { } | |
400 | }; | |
401 | ||
402 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); | |
403 | #endif /* CONFIG_USB_LIBUSUAL */ | |
404 | ||
405 | /* | |
406 | * Find me a way to identify "next free minor" for add_disk(), | |
407 | * and the array disappears the next day. However, the number of | |
408 | * hosts has something to do with the naming and /proc/partitions. | |
409 | * This has to be thought out in detail before changing. | |
410 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. | |
411 | */ | |
412 | #define UB_MAX_HOSTS 26 | |
413 | static char ub_hostv[UB_MAX_HOSTS]; | |
414 | ||
415 | #define UB_QLOCK_NUM 5 | |
416 | static spinlock_t ub_qlockv[UB_QLOCK_NUM]; | |
417 | static int ub_qlock_next = 0; | |
418 | ||
419 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ | |
420 | ||
421 | /* | |
422 | * The id allocator. | |
423 | * | |
424 | * This also stores the host for indexing by minor, which is somewhat dirty. | |
425 | */ | |
426 | static int ub_id_get(void) | |
427 | { | |
428 | unsigned long flags; | |
429 | int i; | |
430 | ||
431 | spin_lock_irqsave(&ub_lock, flags); | |
432 | for (i = 0; i < UB_MAX_HOSTS; i++) { | |
433 | if (ub_hostv[i] == 0) { | |
434 | ub_hostv[i] = 1; | |
435 | spin_unlock_irqrestore(&ub_lock, flags); | |
436 | return i; | |
437 | } | |
438 | } | |
439 | spin_unlock_irqrestore(&ub_lock, flags); | |
440 | return -1; | |
441 | } | |
442 | ||
443 | static void ub_id_put(int id) | |
444 | { | |
445 | unsigned long flags; | |
446 | ||
447 | if (id < 0 || id >= UB_MAX_HOSTS) { | |
448 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); | |
449 | return; | |
450 | } | |
451 | ||
452 | spin_lock_irqsave(&ub_lock, flags); | |
453 | if (ub_hostv[id] == 0) { | |
454 | spin_unlock_irqrestore(&ub_lock, flags); | |
455 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); | |
456 | return; | |
457 | } | |
458 | ub_hostv[id] = 0; | |
459 | spin_unlock_irqrestore(&ub_lock, flags); | |
460 | } | |
461 | ||
462 | /* | |
463 | * This is necessitated by the fact that blk_cleanup_queue does not | |
464 | * necesserily destroy the queue. Instead, it may merely decrease q->refcnt. | |
465 | * Since our blk_init_queue() passes a spinlock common with ub_dev, | |
466 | * we have life time issues when ub_cleanup frees ub_dev. | |
467 | */ | |
468 | static spinlock_t *ub_next_lock(void) | |
469 | { | |
470 | unsigned long flags; | |
471 | spinlock_t *ret; | |
472 | ||
473 | spin_lock_irqsave(&ub_lock, flags); | |
474 | ret = &ub_qlockv[ub_qlock_next]; | |
475 | ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM; | |
476 | spin_unlock_irqrestore(&ub_lock, flags); | |
477 | return ret; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Downcount for deallocation. This rides on two assumptions: | |
482 | * - once something is poisoned, its refcount cannot grow | |
483 | * - opens cannot happen at this time (del_gendisk was done) | |
484 | * If the above is true, we can drop the lock, which we need for | |
485 | * blk_cleanup_queue(): the silly thing may attempt to sleep. | |
486 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] | |
487 | */ | |
488 | static void ub_put(struct ub_dev *sc) | |
489 | { | |
490 | unsigned long flags; | |
491 | ||
492 | spin_lock_irqsave(&ub_lock, flags); | |
493 | --sc->openc; | |
494 | if (sc->openc == 0 && atomic_read(&sc->poison)) { | |
495 | spin_unlock_irqrestore(&ub_lock, flags); | |
496 | ub_cleanup(sc); | |
497 | } else { | |
498 | spin_unlock_irqrestore(&ub_lock, flags); | |
499 | } | |
500 | } | |
501 | ||
502 | /* | |
503 | * Final cleanup and deallocation. | |
504 | */ | |
505 | static void ub_cleanup(struct ub_dev *sc) | |
506 | { | |
507 | struct list_head *p; | |
508 | struct ub_lun *lun; | |
509 | struct request_queue *q; | |
510 | ||
511 | while (!list_empty(&sc->luns)) { | |
512 | p = sc->luns.next; | |
513 | lun = list_entry(p, struct ub_lun, link); | |
514 | list_del(p); | |
515 | ||
516 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ | |
517 | if ((q = lun->disk->queue) != NULL) | |
518 | blk_cleanup_queue(q); | |
519 | /* | |
520 | * If we zero disk->private_data BEFORE put_disk, we have | |
521 | * to check for NULL all over the place in open, release, | |
522 | * check_media and revalidate, because the block level | |
523 | * semaphore is well inside the put_disk. | |
524 | * But we cannot zero after the call, because *disk is gone. | |
525 | * The sd.c is blatantly racy in this area. | |
526 | */ | |
527 | /* disk->private_data = NULL; */ | |
528 | put_disk(lun->disk); | |
529 | lun->disk = NULL; | |
530 | ||
531 | ub_id_put(lun->id); | |
532 | kfree(lun); | |
533 | } | |
534 | ||
535 | usb_set_intfdata(sc->intf, NULL); | |
536 | usb_put_intf(sc->intf); | |
537 | usb_put_dev(sc->dev); | |
538 | kfree(sc); | |
539 | } | |
540 | ||
541 | /* | |
542 | * The "command allocator". | |
543 | */ | |
544 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) | |
545 | { | |
546 | struct ub_scsi_cmd *ret; | |
547 | ||
548 | if (lun->cmda[0]) | |
549 | return NULL; | |
550 | ret = &lun->cmdv[0]; | |
551 | lun->cmda[0] = 1; | |
552 | return ret; | |
553 | } | |
554 | ||
555 | static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) | |
556 | { | |
557 | if (cmd != &lun->cmdv[0]) { | |
558 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", | |
559 | lun->name, cmd); | |
560 | return; | |
561 | } | |
562 | if (!lun->cmda[0]) { | |
563 | printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); | |
564 | return; | |
565 | } | |
566 | lun->cmda[0] = 0; | |
567 | } | |
568 | ||
569 | /* | |
570 | * The command queue. | |
571 | */ | |
572 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
573 | { | |
574 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
575 | ||
576 | if (t->qlen++ == 0) { | |
577 | t->head = cmd; | |
578 | t->tail = cmd; | |
579 | } else { | |
580 | t->tail->next = cmd; | |
581 | t->tail = cmd; | |
582 | } | |
583 | ||
584 | if (t->qlen > t->qmax) | |
585 | t->qmax = t->qlen; | |
586 | } | |
587 | ||
588 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
589 | { | |
590 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
591 | ||
592 | if (t->qlen++ == 0) { | |
593 | t->head = cmd; | |
594 | t->tail = cmd; | |
595 | } else { | |
596 | cmd->next = t->head; | |
597 | t->head = cmd; | |
598 | } | |
599 | ||
600 | if (t->qlen > t->qmax) | |
601 | t->qmax = t->qlen; | |
602 | } | |
603 | ||
604 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) | |
605 | { | |
606 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
607 | struct ub_scsi_cmd *cmd; | |
608 | ||
609 | if (t->qlen == 0) | |
610 | return NULL; | |
611 | if (--t->qlen == 0) | |
612 | t->tail = NULL; | |
613 | cmd = t->head; | |
614 | t->head = cmd->next; | |
615 | cmd->next = NULL; | |
616 | return cmd; | |
617 | } | |
618 | ||
619 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) | |
620 | ||
621 | /* | |
622 | * The request function is our main entry point | |
623 | */ | |
624 | ||
625 | static void ub_request_fn(struct request_queue *q) | |
626 | { | |
627 | struct ub_lun *lun = q->queuedata; | |
628 | struct request *rq; | |
629 | ||
630 | while ((rq = elv_next_request(q)) != NULL) { | |
631 | if (ub_request_fn_1(lun, rq) != 0) { | |
632 | blk_stop_queue(q); | |
633 | break; | |
634 | } | |
635 | } | |
636 | } | |
637 | ||
638 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq) | |
639 | { | |
640 | struct ub_dev *sc = lun->udev; | |
641 | struct ub_scsi_cmd *cmd; | |
642 | struct ub_request *urq; | |
643 | int n_elem; | |
644 | ||
645 | if (atomic_read(&sc->poison)) { | |
646 | blkdev_dequeue_request(rq); | |
647 | ub_end_rq(rq, DID_NO_CONNECT << 16, blk_rq_bytes(rq)); | |
648 | return 0; | |
649 | } | |
650 | ||
651 | if (lun->changed && !blk_pc_request(rq)) { | |
652 | blkdev_dequeue_request(rq); | |
653 | ub_end_rq(rq, SAM_STAT_CHECK_CONDITION, blk_rq_bytes(rq)); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | if (lun->urq.rq != NULL) | |
658 | return -1; | |
659 | if ((cmd = ub_get_cmd(lun)) == NULL) | |
660 | return -1; | |
661 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
662 | ||
663 | blkdev_dequeue_request(rq); | |
664 | ||
665 | urq = &lun->urq; | |
666 | memset(urq, 0, sizeof(struct ub_request)); | |
667 | urq->rq = rq; | |
668 | ||
669 | /* | |
670 | * get scatterlist from block layer | |
671 | */ | |
672 | sg_init_table(&urq->sgv[0], UB_MAX_REQ_SG); | |
673 | n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]); | |
674 | if (n_elem < 0) { | |
675 | /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */ | |
676 | printk(KERN_INFO "%s: failed request map (%d)\n", | |
677 | lun->name, n_elem); | |
678 | goto drop; | |
679 | } | |
680 | if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */ | |
681 | printk(KERN_WARNING "%s: request with %d segments\n", | |
682 | lun->name, n_elem); | |
683 | goto drop; | |
684 | } | |
685 | urq->nsg = n_elem; | |
686 | ||
687 | if (blk_pc_request(rq)) { | |
688 | ub_cmd_build_packet(sc, lun, cmd, urq); | |
689 | } else { | |
690 | ub_cmd_build_block(sc, lun, cmd, urq); | |
691 | } | |
692 | cmd->state = UB_CMDST_INIT; | |
693 | cmd->lun = lun; | |
694 | cmd->done = ub_rw_cmd_done; | |
695 | cmd->back = urq; | |
696 | ||
697 | cmd->tag = sc->tagcnt++; | |
698 | if (ub_submit_scsi(sc, cmd) != 0) | |
699 | goto drop; | |
700 | ||
701 | return 0; | |
702 | ||
703 | drop: | |
704 | ub_put_cmd(lun, cmd); | |
705 | ub_end_rq(rq, DID_ERROR << 16, blk_rq_bytes(rq)); | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, | |
710 | struct ub_scsi_cmd *cmd, struct ub_request *urq) | |
711 | { | |
712 | struct request *rq = urq->rq; | |
713 | unsigned int block, nblks; | |
714 | ||
715 | if (rq_data_dir(rq) == WRITE) | |
716 | cmd->dir = UB_DIR_WRITE; | |
717 | else | |
718 | cmd->dir = UB_DIR_READ; | |
719 | ||
720 | cmd->nsg = urq->nsg; | |
721 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); | |
722 | ||
723 | /* | |
724 | * build the command | |
725 | * | |
726 | * The call to blk_queue_hardsect_size() guarantees that request | |
727 | * is aligned, but it is given in terms of 512 byte units, always. | |
728 | */ | |
729 | block = rq->sector >> lun->capacity.bshift; | |
730 | nblks = rq->nr_sectors >> lun->capacity.bshift; | |
731 | ||
732 | cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10; | |
733 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ | |
734 | cmd->cdb[2] = block >> 24; | |
735 | cmd->cdb[3] = block >> 16; | |
736 | cmd->cdb[4] = block >> 8; | |
737 | cmd->cdb[5] = block; | |
738 | cmd->cdb[7] = nblks >> 8; | |
739 | cmd->cdb[8] = nblks; | |
740 | cmd->cdb_len = 10; | |
741 | ||
742 | cmd->len = rq->nr_sectors * 512; | |
743 | } | |
744 | ||
745 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, | |
746 | struct ub_scsi_cmd *cmd, struct ub_request *urq) | |
747 | { | |
748 | struct request *rq = urq->rq; | |
749 | ||
750 | if (rq->data_len == 0) { | |
751 | cmd->dir = UB_DIR_NONE; | |
752 | } else { | |
753 | if (rq_data_dir(rq) == WRITE) | |
754 | cmd->dir = UB_DIR_WRITE; | |
755 | else | |
756 | cmd->dir = UB_DIR_READ; | |
757 | } | |
758 | ||
759 | cmd->nsg = urq->nsg; | |
760 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); | |
761 | ||
762 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); | |
763 | cmd->cdb_len = rq->cmd_len; | |
764 | ||
765 | cmd->len = rq->data_len; | |
766 | ||
767 | /* | |
768 | * To reapply this to every URB is not as incorrect as it looks. | |
769 | * In return, we avoid any complicated tracking calculations. | |
770 | */ | |
771 | cmd->timeo = rq->timeout; | |
772 | } | |
773 | ||
774 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
775 | { | |
776 | struct ub_lun *lun = cmd->lun; | |
777 | struct ub_request *urq = cmd->back; | |
778 | struct request *rq; | |
779 | unsigned int scsi_status; | |
780 | unsigned int cmd_len; | |
781 | ||
782 | rq = urq->rq; | |
783 | ||
784 | if (cmd->error == 0) { | |
785 | if (blk_pc_request(rq)) { | |
786 | if (cmd->act_len >= rq->data_len) | |
787 | rq->data_len = 0; | |
788 | else | |
789 | rq->data_len -= cmd->act_len; | |
790 | scsi_status = 0; | |
791 | } else { | |
792 | if (cmd->act_len != cmd->len) { | |
793 | scsi_status = SAM_STAT_CHECK_CONDITION; | |
794 | } else { | |
795 | scsi_status = 0; | |
796 | } | |
797 | } | |
798 | } else { | |
799 | if (blk_pc_request(rq)) { | |
800 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ | |
801 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); | |
802 | rq->sense_len = UB_SENSE_SIZE; | |
803 | if (sc->top_sense[0] != 0) | |
804 | scsi_status = SAM_STAT_CHECK_CONDITION; | |
805 | else | |
806 | scsi_status = DID_ERROR << 16; | |
807 | } else { | |
808 | if (cmd->error == -EIO && | |
809 | (cmd->key == 0 || | |
810 | cmd->key == MEDIUM_ERROR || | |
811 | cmd->key == UNIT_ATTENTION)) { | |
812 | if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0) | |
813 | return; | |
814 | } | |
815 | scsi_status = SAM_STAT_CHECK_CONDITION; | |
816 | } | |
817 | } | |
818 | ||
819 | urq->rq = NULL; | |
820 | ||
821 | cmd_len = cmd->len; | |
822 | ub_put_cmd(lun, cmd); | |
823 | ub_end_rq(rq, scsi_status, cmd_len); | |
824 | blk_start_queue(lun->disk->queue); | |
825 | } | |
826 | ||
827 | static void ub_end_rq(struct request *rq, unsigned int scsi_status, | |
828 | unsigned int cmd_len) | |
829 | { | |
830 | int error; | |
831 | long rqlen; | |
832 | ||
833 | if (scsi_status == 0) { | |
834 | error = 0; | |
835 | } else { | |
836 | error = -EIO; | |
837 | rq->errors = scsi_status; | |
838 | } | |
839 | rqlen = blk_rq_bytes(rq); /* Oddly enough, this is the residue. */ | |
840 | if (__blk_end_request(rq, error, cmd_len)) { | |
841 | printk(KERN_WARNING DRV_NAME | |
842 | ": __blk_end_request blew, %s-cmd total %u rqlen %ld\n", | |
843 | blk_pc_request(rq)? "pc": "fs", cmd_len, rqlen); | |
844 | } | |
845 | } | |
846 | ||
847 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, | |
848 | struct ub_request *urq, struct ub_scsi_cmd *cmd) | |
849 | { | |
850 | ||
851 | if (atomic_read(&sc->poison)) | |
852 | return -ENXIO; | |
853 | ||
854 | ub_reset_enter(sc, urq->current_try); | |
855 | ||
856 | if (urq->current_try >= 3) | |
857 | return -EIO; | |
858 | urq->current_try++; | |
859 | ||
860 | /* Remove this if anyone complains of flooding. */ | |
861 | printk(KERN_DEBUG "%s: dir %c len/act %d/%d " | |
862 | "[sense %x %02x %02x] retry %d\n", | |
863 | sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len, | |
864 | cmd->key, cmd->asc, cmd->ascq, urq->current_try); | |
865 | ||
866 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
867 | ub_cmd_build_block(sc, lun, cmd, urq); | |
868 | ||
869 | cmd->state = UB_CMDST_INIT; | |
870 | cmd->lun = lun; | |
871 | cmd->done = ub_rw_cmd_done; | |
872 | cmd->back = urq; | |
873 | ||
874 | cmd->tag = sc->tagcnt++; | |
875 | ||
876 | #if 0 /* Wasteful */ | |
877 | return ub_submit_scsi(sc, cmd); | |
878 | #else | |
879 | ub_cmdq_add(sc, cmd); | |
880 | return 0; | |
881 | #endif | |
882 | } | |
883 | ||
884 | /* | |
885 | * Submit a regular SCSI operation (not an auto-sense). | |
886 | * | |
887 | * The Iron Law of Good Submit Routine is: | |
888 | * Zero return - callback is done, Nonzero return - callback is not done. | |
889 | * No exceptions. | |
890 | * | |
891 | * Host is assumed locked. | |
892 | */ | |
893 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
894 | { | |
895 | ||
896 | if (cmd->state != UB_CMDST_INIT || | |
897 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { | |
898 | return -EINVAL; | |
899 | } | |
900 | ||
901 | ub_cmdq_add(sc, cmd); | |
902 | /* | |
903 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little | |
904 | * safer to jump to a tasklet, in case upper layers do something silly. | |
905 | */ | |
906 | tasklet_schedule(&sc->tasklet); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /* | |
911 | * Submit the first URB for the queued command. | |
912 | * This function does not deal with queueing in any way. | |
913 | */ | |
914 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
915 | { | |
916 | struct bulk_cb_wrap *bcb; | |
917 | int rc; | |
918 | ||
919 | bcb = &sc->work_bcb; | |
920 | ||
921 | /* | |
922 | * ``If the allocation length is eighteen or greater, and a device | |
923 | * server returns less than eithteen bytes of data, the application | |
924 | * client should assume that the bytes not transferred would have been | |
925 | * zeroes had the device server returned those bytes.'' | |
926 | * | |
927 | * We zero sense for all commands so that when a packet request | |
928 | * fails it does not return a stale sense. | |
929 | */ | |
930 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); | |
931 | ||
932 | /* set up the command wrapper */ | |
933 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
934 | bcb->Tag = cmd->tag; /* Endianness is not important */ | |
935 | bcb->DataTransferLength = cpu_to_le32(cmd->len); | |
936 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; | |
937 | bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; | |
938 | bcb->Length = cmd->cdb_len; | |
939 | ||
940 | /* copy the command payload */ | |
941 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); | |
942 | ||
943 | UB_INIT_COMPLETION(sc->work_done); | |
944 | ||
945 | sc->last_pipe = sc->send_bulk_pipe; | |
946 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, | |
947 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); | |
948 | ||
949 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
950 | /* XXX Clear stalls */ | |
951 | ub_complete(&sc->work_done); | |
952 | return rc; | |
953 | } | |
954 | ||
955 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; | |
956 | add_timer(&sc->work_timer); | |
957 | ||
958 | cmd->state = UB_CMDST_CMD; | |
959 | return 0; | |
960 | } | |
961 | ||
962 | /* | |
963 | * Timeout handler. | |
964 | */ | |
965 | static void ub_urb_timeout(unsigned long arg) | |
966 | { | |
967 | struct ub_dev *sc = (struct ub_dev *) arg; | |
968 | unsigned long flags; | |
969 | ||
970 | spin_lock_irqsave(sc->lock, flags); | |
971 | if (!ub_is_completed(&sc->work_done)) | |
972 | usb_unlink_urb(&sc->work_urb); | |
973 | spin_unlock_irqrestore(sc->lock, flags); | |
974 | } | |
975 | ||
976 | /* | |
977 | * Completion routine for the work URB. | |
978 | * | |
979 | * This can be called directly from usb_submit_urb (while we have | |
980 | * the sc->lock taken) and from an interrupt (while we do NOT have | |
981 | * the sc->lock taken). Therefore, bounce this off to a tasklet. | |
982 | */ | |
983 | static void ub_urb_complete(struct urb *urb) | |
984 | { | |
985 | struct ub_dev *sc = urb->context; | |
986 | ||
987 | ub_complete(&sc->work_done); | |
988 | tasklet_schedule(&sc->tasklet); | |
989 | } | |
990 | ||
991 | static void ub_scsi_action(unsigned long _dev) | |
992 | { | |
993 | struct ub_dev *sc = (struct ub_dev *) _dev; | |
994 | unsigned long flags; | |
995 | ||
996 | spin_lock_irqsave(sc->lock, flags); | |
997 | ub_scsi_dispatch(sc); | |
998 | spin_unlock_irqrestore(sc->lock, flags); | |
999 | } | |
1000 | ||
1001 | static void ub_scsi_dispatch(struct ub_dev *sc) | |
1002 | { | |
1003 | struct ub_scsi_cmd *cmd; | |
1004 | int rc; | |
1005 | ||
1006 | while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) { | |
1007 | if (cmd->state == UB_CMDST_DONE) { | |
1008 | ub_cmdq_pop(sc); | |
1009 | (*cmd->done)(sc, cmd); | |
1010 | } else if (cmd->state == UB_CMDST_INIT) { | |
1011 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) | |
1012 | break; | |
1013 | cmd->error = rc; | |
1014 | cmd->state = UB_CMDST_DONE; | |
1015 | } else { | |
1016 | if (!ub_is_completed(&sc->work_done)) | |
1017 | break; | |
1018 | del_timer(&sc->work_timer); | |
1019 | ub_scsi_urb_compl(sc, cmd); | |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1025 | { | |
1026 | struct urb *urb = &sc->work_urb; | |
1027 | struct bulk_cs_wrap *bcs; | |
1028 | int endp; | |
1029 | int len; | |
1030 | int rc; | |
1031 | ||
1032 | if (atomic_read(&sc->poison)) { | |
1033 | ub_state_done(sc, cmd, -ENODEV); | |
1034 | return; | |
1035 | } | |
1036 | ||
1037 | endp = usb_pipeendpoint(sc->last_pipe); | |
1038 | if (usb_pipein(sc->last_pipe)) | |
1039 | endp |= USB_DIR_IN; | |
1040 | ||
1041 | if (cmd->state == UB_CMDST_CLEAR) { | |
1042 | if (urb->status == -EPIPE) { | |
1043 | /* | |
1044 | * STALL while clearning STALL. | |
1045 | * The control pipe clears itself - nothing to do. | |
1046 | */ | |
1047 | printk(KERN_NOTICE "%s: stall on control pipe\n", | |
1048 | sc->name); | |
1049 | goto Bad_End; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * We ignore the result for the halt clear. | |
1054 | */ | |
1055 | ||
1056 | usb_reset_endpoint(sc->dev, endp); | |
1057 | ||
1058 | ub_state_sense(sc, cmd); | |
1059 | ||
1060 | } else if (cmd->state == UB_CMDST_CLR2STS) { | |
1061 | if (urb->status == -EPIPE) { | |
1062 | printk(KERN_NOTICE "%s: stall on control pipe\n", | |
1063 | sc->name); | |
1064 | goto Bad_End; | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * We ignore the result for the halt clear. | |
1069 | */ | |
1070 | ||
1071 | usb_reset_endpoint(sc->dev, endp); | |
1072 | ||
1073 | ub_state_stat(sc, cmd); | |
1074 | ||
1075 | } else if (cmd->state == UB_CMDST_CLRRS) { | |
1076 | if (urb->status == -EPIPE) { | |
1077 | printk(KERN_NOTICE "%s: stall on control pipe\n", | |
1078 | sc->name); | |
1079 | goto Bad_End; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * We ignore the result for the halt clear. | |
1084 | */ | |
1085 | ||
1086 | usb_reset_endpoint(sc->dev, endp); | |
1087 | ||
1088 | ub_state_stat_counted(sc, cmd); | |
1089 | ||
1090 | } else if (cmd->state == UB_CMDST_CMD) { | |
1091 | switch (urb->status) { | |
1092 | case 0: | |
1093 | break; | |
1094 | case -EOVERFLOW: | |
1095 | goto Bad_End; | |
1096 | case -EPIPE: | |
1097 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1098 | if (rc != 0) { | |
1099 | printk(KERN_NOTICE "%s: " | |
1100 | "unable to submit clear (%d)\n", | |
1101 | sc->name, rc); | |
1102 | /* | |
1103 | * This is typically ENOMEM or some other such shit. | |
1104 | * Retrying is pointless. Just do Bad End on it... | |
1105 | */ | |
1106 | ub_state_done(sc, cmd, rc); | |
1107 | return; | |
1108 | } | |
1109 | cmd->state = UB_CMDST_CLEAR; | |
1110 | return; | |
1111 | case -ESHUTDOWN: /* unplug */ | |
1112 | case -EILSEQ: /* unplug timeout on uhci */ | |
1113 | ub_state_done(sc, cmd, -ENODEV); | |
1114 | return; | |
1115 | default: | |
1116 | goto Bad_End; | |
1117 | } | |
1118 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { | |
1119 | goto Bad_End; | |
1120 | } | |
1121 | ||
1122 | if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) { | |
1123 | ub_state_stat(sc, cmd); | |
1124 | return; | |
1125 | } | |
1126 | ||
1127 | // udelay(125); // usb-storage has this | |
1128 | ub_data_start(sc, cmd); | |
1129 | ||
1130 | } else if (cmd->state == UB_CMDST_DATA) { | |
1131 | if (urb->status == -EPIPE) { | |
1132 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1133 | if (rc != 0) { | |
1134 | printk(KERN_NOTICE "%s: " | |
1135 | "unable to submit clear (%d)\n", | |
1136 | sc->name, rc); | |
1137 | ub_state_done(sc, cmd, rc); | |
1138 | return; | |
1139 | } | |
1140 | cmd->state = UB_CMDST_CLR2STS; | |
1141 | return; | |
1142 | } | |
1143 | if (urb->status == -EOVERFLOW) { | |
1144 | /* | |
1145 | * A babble? Failure, but we must transfer CSW now. | |
1146 | */ | |
1147 | cmd->error = -EOVERFLOW; /* A cheap trick... */ | |
1148 | ub_state_stat(sc, cmd); | |
1149 | return; | |
1150 | } | |
1151 | ||
1152 | if (cmd->dir == UB_DIR_WRITE) { | |
1153 | /* | |
1154 | * Do not continue writes in case of a failure. | |
1155 | * Doing so would cause sectors to be mixed up, | |
1156 | * which is worse than sectors lost. | |
1157 | * | |
1158 | * We must try to read the CSW, or many devices | |
1159 | * get confused. | |
1160 | */ | |
1161 | len = urb->actual_length; | |
1162 | if (urb->status != 0 || | |
1163 | len != cmd->sgv[cmd->current_sg].length) { | |
1164 | cmd->act_len += len; | |
1165 | ||
1166 | cmd->error = -EIO; | |
1167 | ub_state_stat(sc, cmd); | |
1168 | return; | |
1169 | } | |
1170 | ||
1171 | } else { | |
1172 | /* | |
1173 | * If an error occurs on read, we record it, and | |
1174 | * continue to fetch data in order to avoid bubble. | |
1175 | * | |
1176 | * As a small shortcut, we stop if we detect that | |
1177 | * a CSW mixed into data. | |
1178 | */ | |
1179 | if (urb->status != 0) | |
1180 | cmd->error = -EIO; | |
1181 | ||
1182 | len = urb->actual_length; | |
1183 | if (urb->status != 0 || | |
1184 | len != cmd->sgv[cmd->current_sg].length) { | |
1185 | if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN) | |
1186 | goto Bad_End; | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | cmd->act_len += urb->actual_length; | |
1191 | ||
1192 | if (++cmd->current_sg < cmd->nsg) { | |
1193 | ub_data_start(sc, cmd); | |
1194 | return; | |
1195 | } | |
1196 | ub_state_stat(sc, cmd); | |
1197 | ||
1198 | } else if (cmd->state == UB_CMDST_STAT) { | |
1199 | if (urb->status == -EPIPE) { | |
1200 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1201 | if (rc != 0) { | |
1202 | printk(KERN_NOTICE "%s: " | |
1203 | "unable to submit clear (%d)\n", | |
1204 | sc->name, rc); | |
1205 | ub_state_done(sc, cmd, rc); | |
1206 | return; | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Having a stall when getting CSW is an error, so | |
1211 | * make sure uppper levels are not oblivious to it. | |
1212 | */ | |
1213 | cmd->error = -EIO; /* A cheap trick... */ | |
1214 | ||
1215 | cmd->state = UB_CMDST_CLRRS; | |
1216 | return; | |
1217 | } | |
1218 | ||
1219 | /* Catch everything, including -EOVERFLOW and other nasties. */ | |
1220 | if (urb->status != 0) | |
1221 | goto Bad_End; | |
1222 | ||
1223 | if (urb->actual_length == 0) { | |
1224 | ub_state_stat_counted(sc, cmd); | |
1225 | return; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * Check the returned Bulk protocol status. | |
1230 | * The status block has to be validated first. | |
1231 | */ | |
1232 | ||
1233 | bcs = &sc->work_bcs; | |
1234 | ||
1235 | if (sc->signature == cpu_to_le32(0)) { | |
1236 | /* | |
1237 | * This is the first reply, so do not perform the check. | |
1238 | * Instead, remember the signature the device uses | |
1239 | * for future checks. But do not allow a nul. | |
1240 | */ | |
1241 | sc->signature = bcs->Signature; | |
1242 | if (sc->signature == cpu_to_le32(0)) { | |
1243 | ub_state_stat_counted(sc, cmd); | |
1244 | return; | |
1245 | } | |
1246 | } else { | |
1247 | if (bcs->Signature != sc->signature) { | |
1248 | ub_state_stat_counted(sc, cmd); | |
1249 | return; | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | if (bcs->Tag != cmd->tag) { | |
1254 | /* | |
1255 | * This usually happens when we disagree with the | |
1256 | * device's microcode about something. For instance, | |
1257 | * a few of them throw this after timeouts. They buffer | |
1258 | * commands and reply at commands we timed out before. | |
1259 | * Without flushing these replies we loop forever. | |
1260 | */ | |
1261 | ub_state_stat_counted(sc, cmd); | |
1262 | return; | |
1263 | } | |
1264 | ||
1265 | if (!sc->bad_resid) { | |
1266 | len = le32_to_cpu(bcs->Residue); | |
1267 | if (len != cmd->len - cmd->act_len) { | |
1268 | /* | |
1269 | * Only start ignoring if this cmd ended well. | |
1270 | */ | |
1271 | if (cmd->len == cmd->act_len) { | |
1272 | printk(KERN_NOTICE "%s: " | |
1273 | "bad residual %d of %d, ignoring\n", | |
1274 | sc->name, len, cmd->len); | |
1275 | sc->bad_resid = 1; | |
1276 | } | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | switch (bcs->Status) { | |
1281 | case US_BULK_STAT_OK: | |
1282 | break; | |
1283 | case US_BULK_STAT_FAIL: | |
1284 | ub_state_sense(sc, cmd); | |
1285 | return; | |
1286 | case US_BULK_STAT_PHASE: | |
1287 | goto Bad_End; | |
1288 | default: | |
1289 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", | |
1290 | sc->name, bcs->Status); | |
1291 | ub_state_done(sc, cmd, -EINVAL); | |
1292 | return; | |
1293 | } | |
1294 | ||
1295 | /* Not zeroing error to preserve a babble indicator */ | |
1296 | if (cmd->error != 0) { | |
1297 | ub_state_sense(sc, cmd); | |
1298 | return; | |
1299 | } | |
1300 | cmd->state = UB_CMDST_DONE; | |
1301 | ub_cmdq_pop(sc); | |
1302 | (*cmd->done)(sc, cmd); | |
1303 | ||
1304 | } else if (cmd->state == UB_CMDST_SENSE) { | |
1305 | ub_state_done(sc, cmd, -EIO); | |
1306 | ||
1307 | } else { | |
1308 | printk(KERN_WARNING "%s: wrong command state %d\n", | |
1309 | sc->name, cmd->state); | |
1310 | ub_state_done(sc, cmd, -EINVAL); | |
1311 | return; | |
1312 | } | |
1313 | return; | |
1314 | ||
1315 | Bad_End: /* Little Excel is dead */ | |
1316 | ub_state_done(sc, cmd, -EIO); | |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * Factorization helper for the command state machine: | |
1321 | * Initiate a data segment transfer. | |
1322 | */ | |
1323 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1324 | { | |
1325 | struct scatterlist *sg = &cmd->sgv[cmd->current_sg]; | |
1326 | int pipe; | |
1327 | int rc; | |
1328 | ||
1329 | UB_INIT_COMPLETION(sc->work_done); | |
1330 | ||
1331 | if (cmd->dir == UB_DIR_READ) | |
1332 | pipe = sc->recv_bulk_pipe; | |
1333 | else | |
1334 | pipe = sc->send_bulk_pipe; | |
1335 | sc->last_pipe = pipe; | |
1336 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, sg_virt(sg), | |
1337 | sg->length, ub_urb_complete, sc); | |
1338 | ||
1339 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1340 | /* XXX Clear stalls */ | |
1341 | ub_complete(&sc->work_done); | |
1342 | ub_state_done(sc, cmd, rc); | |
1343 | return; | |
1344 | } | |
1345 | ||
1346 | if (cmd->timeo) | |
1347 | sc->work_timer.expires = jiffies + cmd->timeo; | |
1348 | else | |
1349 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; | |
1350 | add_timer(&sc->work_timer); | |
1351 | ||
1352 | cmd->state = UB_CMDST_DATA; | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * Factorization helper for the command state machine: | |
1357 | * Finish the command. | |
1358 | */ | |
1359 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) | |
1360 | { | |
1361 | ||
1362 | cmd->error = rc; | |
1363 | cmd->state = UB_CMDST_DONE; | |
1364 | ub_cmdq_pop(sc); | |
1365 | (*cmd->done)(sc, cmd); | |
1366 | } | |
1367 | ||
1368 | /* | |
1369 | * Factorization helper for the command state machine: | |
1370 | * Submit a CSW read. | |
1371 | */ | |
1372 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1373 | { | |
1374 | int rc; | |
1375 | ||
1376 | UB_INIT_COMPLETION(sc->work_done); | |
1377 | ||
1378 | sc->last_pipe = sc->recv_bulk_pipe; | |
1379 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, | |
1380 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); | |
1381 | ||
1382 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1383 | /* XXX Clear stalls */ | |
1384 | ub_complete(&sc->work_done); | |
1385 | ub_state_done(sc, cmd, rc); | |
1386 | return -1; | |
1387 | } | |
1388 | ||
1389 | if (cmd->timeo) | |
1390 | sc->work_timer.expires = jiffies + cmd->timeo; | |
1391 | else | |
1392 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; | |
1393 | add_timer(&sc->work_timer); | |
1394 | return 0; | |
1395 | } | |
1396 | ||
1397 | /* | |
1398 | * Factorization helper for the command state machine: | |
1399 | * Submit a CSW read and go to STAT state. | |
1400 | */ | |
1401 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1402 | { | |
1403 | ||
1404 | if (__ub_state_stat(sc, cmd) != 0) | |
1405 | return; | |
1406 | ||
1407 | cmd->stat_count = 0; | |
1408 | cmd->state = UB_CMDST_STAT; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Factorization helper for the command state machine: | |
1413 | * Submit a CSW read and go to STAT state with counter (along [C] path). | |
1414 | */ | |
1415 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1416 | { | |
1417 | ||
1418 | if (++cmd->stat_count >= 4) { | |
1419 | ub_state_sense(sc, cmd); | |
1420 | return; | |
1421 | } | |
1422 | ||
1423 | if (__ub_state_stat(sc, cmd) != 0) | |
1424 | return; | |
1425 | ||
1426 | cmd->state = UB_CMDST_STAT; | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * Factorization helper for the command state machine: | |
1431 | * Submit a REQUEST SENSE and go to SENSE state. | |
1432 | */ | |
1433 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1434 | { | |
1435 | struct ub_scsi_cmd *scmd; | |
1436 | struct scatterlist *sg; | |
1437 | int rc; | |
1438 | ||
1439 | if (cmd->cdb[0] == REQUEST_SENSE) { | |
1440 | rc = -EPIPE; | |
1441 | goto error; | |
1442 | } | |
1443 | ||
1444 | scmd = &sc->top_rqs_cmd; | |
1445 | memset(scmd, 0, sizeof(struct ub_scsi_cmd)); | |
1446 | scmd->cdb[0] = REQUEST_SENSE; | |
1447 | scmd->cdb[4] = UB_SENSE_SIZE; | |
1448 | scmd->cdb_len = 6; | |
1449 | scmd->dir = UB_DIR_READ; | |
1450 | scmd->state = UB_CMDST_INIT; | |
1451 | scmd->nsg = 1; | |
1452 | sg = &scmd->sgv[0]; | |
1453 | sg_init_table(sg, UB_MAX_REQ_SG); | |
1454 | sg_set_page(sg, virt_to_page(sc->top_sense), UB_SENSE_SIZE, | |
1455 | (unsigned long)sc->top_sense & (PAGE_SIZE-1)); | |
1456 | scmd->len = UB_SENSE_SIZE; | |
1457 | scmd->lun = cmd->lun; | |
1458 | scmd->done = ub_top_sense_done; | |
1459 | scmd->back = cmd; | |
1460 | ||
1461 | scmd->tag = sc->tagcnt++; | |
1462 | ||
1463 | cmd->state = UB_CMDST_SENSE; | |
1464 | ||
1465 | ub_cmdq_insert(sc, scmd); | |
1466 | return; | |
1467 | ||
1468 | error: | |
1469 | ub_state_done(sc, cmd, rc); | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * A helper for the command's state machine: | |
1474 | * Submit a stall clear. | |
1475 | */ | |
1476 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
1477 | int stalled_pipe) | |
1478 | { | |
1479 | int endp; | |
1480 | struct usb_ctrlrequest *cr; | |
1481 | int rc; | |
1482 | ||
1483 | endp = usb_pipeendpoint(stalled_pipe); | |
1484 | if (usb_pipein (stalled_pipe)) | |
1485 | endp |= USB_DIR_IN; | |
1486 | ||
1487 | cr = &sc->work_cr; | |
1488 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
1489 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
1490 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
1491 | cr->wIndex = cpu_to_le16(endp); | |
1492 | cr->wLength = cpu_to_le16(0); | |
1493 | ||
1494 | UB_INIT_COMPLETION(sc->work_done); | |
1495 | ||
1496 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1497 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); | |
1498 | ||
1499 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1500 | ub_complete(&sc->work_done); | |
1501 | return rc; | |
1502 | } | |
1503 | ||
1504 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1505 | add_timer(&sc->work_timer); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | */ | |
1511 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) | |
1512 | { | |
1513 | unsigned char *sense = sc->top_sense; | |
1514 | struct ub_scsi_cmd *cmd; | |
1515 | ||
1516 | /* | |
1517 | * Find the command which triggered the unit attention or a check, | |
1518 | * save the sense into it, and advance its state machine. | |
1519 | */ | |
1520 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { | |
1521 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); | |
1522 | return; | |
1523 | } | |
1524 | if (cmd != scmd->back) { | |
1525 | printk(KERN_WARNING "%s: " | |
1526 | "sense done for wrong command 0x%x\n", | |
1527 | sc->name, cmd->tag); | |
1528 | return; | |
1529 | } | |
1530 | if (cmd->state != UB_CMDST_SENSE) { | |
1531 | printk(KERN_WARNING "%s: sense done with bad cmd state %d\n", | |
1532 | sc->name, cmd->state); | |
1533 | return; | |
1534 | } | |
1535 | ||
1536 | /* | |
1537 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. | |
1538 | */ | |
1539 | cmd->key = sense[2] & 0x0F; | |
1540 | cmd->asc = sense[12]; | |
1541 | cmd->ascq = sense[13]; | |
1542 | ||
1543 | ub_scsi_urb_compl(sc, cmd); | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * Reset management | |
1548 | */ | |
1549 | ||
1550 | static void ub_reset_enter(struct ub_dev *sc, int try) | |
1551 | { | |
1552 | ||
1553 | if (sc->reset) { | |
1554 | /* This happens often on multi-LUN devices. */ | |
1555 | return; | |
1556 | } | |
1557 | sc->reset = try + 1; | |
1558 | ||
1559 | #if 0 /* Not needed because the disconnect waits for us. */ | |
1560 | unsigned long flags; | |
1561 | spin_lock_irqsave(&ub_lock, flags); | |
1562 | sc->openc++; | |
1563 | spin_unlock_irqrestore(&ub_lock, flags); | |
1564 | #endif | |
1565 | ||
1566 | #if 0 /* We let them stop themselves. */ | |
1567 | struct ub_lun *lun; | |
1568 | list_for_each_entry(lun, &sc->luns, link) { | |
1569 | blk_stop_queue(lun->disk->queue); | |
1570 | } | |
1571 | #endif | |
1572 | ||
1573 | schedule_work(&sc->reset_work); | |
1574 | } | |
1575 | ||
1576 | static void ub_reset_task(struct work_struct *work) | |
1577 | { | |
1578 | struct ub_dev *sc = container_of(work, struct ub_dev, reset_work); | |
1579 | unsigned long flags; | |
1580 | struct ub_lun *lun; | |
1581 | int rc; | |
1582 | ||
1583 | if (!sc->reset) { | |
1584 | printk(KERN_WARNING "%s: Running reset unrequested\n", | |
1585 | sc->name); | |
1586 | return; | |
1587 | } | |
1588 | ||
1589 | if (atomic_read(&sc->poison)) { | |
1590 | ; | |
1591 | } else if ((sc->reset & 1) == 0) { | |
1592 | ub_sync_reset(sc); | |
1593 | msleep(700); /* usb-storage sleeps 6s (!) */ | |
1594 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
1595 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
1596 | } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) { | |
1597 | ; | |
1598 | } else { | |
1599 | rc = usb_lock_device_for_reset(sc->dev, sc->intf); | |
1600 | if (rc < 0) { | |
1601 | printk(KERN_NOTICE | |
1602 | "%s: usb_lock_device_for_reset failed (%d)\n", | |
1603 | sc->name, rc); | |
1604 | } else { | |
1605 | rc = usb_reset_device(sc->dev); | |
1606 | if (rc < 0) { | |
1607 | printk(KERN_NOTICE "%s: " | |
1608 | "usb_lock_device_for_reset failed (%d)\n", | |
1609 | sc->name, rc); | |
1610 | } | |
1611 | usb_unlock_device(sc->dev); | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * In theory, no commands can be running while reset is active, | |
1617 | * so nobody can ask for another reset, and so we do not need any | |
1618 | * queues of resets or anything. We do need a spinlock though, | |
1619 | * to interact with block layer. | |
1620 | */ | |
1621 | spin_lock_irqsave(sc->lock, flags); | |
1622 | sc->reset = 0; | |
1623 | tasklet_schedule(&sc->tasklet); | |
1624 | list_for_each_entry(lun, &sc->luns, link) { | |
1625 | blk_start_queue(lun->disk->queue); | |
1626 | } | |
1627 | wake_up(&sc->reset_wait); | |
1628 | spin_unlock_irqrestore(sc->lock, flags); | |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * XXX Reset brackets are too much hassle to implement, so just stub them | |
1633 | * in order to prevent forced unbinding (which deadlocks solid when our | |
1634 | * ->disconnect method waits for the reset to complete and this kills keventd). | |
1635 | * | |
1636 | * XXX Tell Alan to move usb_unlock_device inside of usb_reset_device, | |
1637 | * or else the post_reset is invoked, and restats I/O on a locked device. | |
1638 | */ | |
1639 | static int ub_pre_reset(struct usb_interface *iface) { | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | static int ub_post_reset(struct usb_interface *iface) { | |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * This is called from a process context. | |
1649 | */ | |
1650 | static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) | |
1651 | { | |
1652 | ||
1653 | lun->readonly = 0; /* XXX Query this from the device */ | |
1654 | ||
1655 | lun->capacity.nsec = 0; | |
1656 | lun->capacity.bsize = 512; | |
1657 | lun->capacity.bshift = 0; | |
1658 | ||
1659 | if (ub_sync_tur(sc, lun) != 0) | |
1660 | return; /* Not ready */ | |
1661 | lun->changed = 0; | |
1662 | ||
1663 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { | |
1664 | /* | |
1665 | * The retry here means something is wrong, either with the | |
1666 | * device, with the transport, or with our code. | |
1667 | * We keep this because sd.c has retries for capacity. | |
1668 | */ | |
1669 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { | |
1670 | lun->capacity.nsec = 0; | |
1671 | lun->capacity.bsize = 512; | |
1672 | lun->capacity.bshift = 0; | |
1673 | } | |
1674 | } | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * The open funcion. | |
1679 | * This is mostly needed to keep refcounting, but also to support | |
1680 | * media checks on removable media drives. | |
1681 | */ | |
1682 | static int ub_bd_open(struct block_device *bdev, fmode_t mode) | |
1683 | { | |
1684 | struct ub_lun *lun = bdev->bd_disk->private_data; | |
1685 | struct ub_dev *sc = lun->udev; | |
1686 | unsigned long flags; | |
1687 | int rc; | |
1688 | ||
1689 | spin_lock_irqsave(&ub_lock, flags); | |
1690 | if (atomic_read(&sc->poison)) { | |
1691 | spin_unlock_irqrestore(&ub_lock, flags); | |
1692 | return -ENXIO; | |
1693 | } | |
1694 | sc->openc++; | |
1695 | spin_unlock_irqrestore(&ub_lock, flags); | |
1696 | ||
1697 | if (lun->removable || lun->readonly) | |
1698 | check_disk_change(bdev); | |
1699 | ||
1700 | /* | |
1701 | * The sd.c considers ->media_present and ->changed not equivalent, | |
1702 | * under some pretty murky conditions (a failure of READ CAPACITY). | |
1703 | * We may need it one day. | |
1704 | */ | |
1705 | if (lun->removable && lun->changed && !(mode & FMODE_NDELAY)) { | |
1706 | rc = -ENOMEDIUM; | |
1707 | goto err_open; | |
1708 | } | |
1709 | ||
1710 | if (lun->readonly && (mode & FMODE_WRITE)) { | |
1711 | rc = -EROFS; | |
1712 | goto err_open; | |
1713 | } | |
1714 | ||
1715 | return 0; | |
1716 | ||
1717 | err_open: | |
1718 | ub_put(sc); | |
1719 | return rc; | |
1720 | } | |
1721 | ||
1722 | /* | |
1723 | */ | |
1724 | static int ub_bd_release(struct gendisk *disk, fmode_t mode) | |
1725 | { | |
1726 | struct ub_lun *lun = disk->private_data; | |
1727 | struct ub_dev *sc = lun->udev; | |
1728 | ||
1729 | ub_put(sc); | |
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * The ioctl interface. | |
1735 | */ | |
1736 | static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode, | |
1737 | unsigned int cmd, unsigned long arg) | |
1738 | { | |
1739 | struct gendisk *disk = bdev->bd_disk; | |
1740 | void __user *usermem = (void __user *) arg; | |
1741 | ||
1742 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem); | |
1743 | } | |
1744 | ||
1745 | /* | |
1746 | * This is called by check_disk_change if we reported a media change. | |
1747 | * The main onjective here is to discover the features of the media such as | |
1748 | * the capacity, read-only status, etc. USB storage generally does not | |
1749 | * need to be spun up, but if we needed it, this would be the place. | |
1750 | * | |
1751 | * This call can sleep. | |
1752 | * | |
1753 | * The return code is not used. | |
1754 | */ | |
1755 | static int ub_bd_revalidate(struct gendisk *disk) | |
1756 | { | |
1757 | struct ub_lun *lun = disk->private_data; | |
1758 | ||
1759 | ub_revalidate(lun->udev, lun); | |
1760 | ||
1761 | /* XXX Support sector size switching like in sr.c */ | |
1762 | blk_queue_hardsect_size(disk->queue, lun->capacity.bsize); | |
1763 | set_capacity(disk, lun->capacity.nsec); | |
1764 | // set_disk_ro(sdkp->disk, lun->readonly); | |
1765 | ||
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | /* | |
1770 | * The check is called by the block layer to verify if the media | |
1771 | * is still available. It is supposed to be harmless, lightweight and | |
1772 | * non-intrusive in case the media was not changed. | |
1773 | * | |
1774 | * This call can sleep. | |
1775 | * | |
1776 | * The return code is bool! | |
1777 | */ | |
1778 | static int ub_bd_media_changed(struct gendisk *disk) | |
1779 | { | |
1780 | struct ub_lun *lun = disk->private_data; | |
1781 | ||
1782 | if (!lun->removable) | |
1783 | return 0; | |
1784 | ||
1785 | /* | |
1786 | * We clean checks always after every command, so this is not | |
1787 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, | |
1788 | * the device is actually not ready with operator or software | |
1789 | * intervention required. One dangerous item might be a drive which | |
1790 | * spins itself down, and come the time to write dirty pages, this | |
1791 | * will fail, then block layer discards the data. Since we never | |
1792 | * spin drives up, such devices simply cannot be used with ub anyway. | |
1793 | */ | |
1794 | if (ub_sync_tur(lun->udev, lun) != 0) { | |
1795 | lun->changed = 1; | |
1796 | return 1; | |
1797 | } | |
1798 | ||
1799 | return lun->changed; | |
1800 | } | |
1801 | ||
1802 | static struct block_device_operations ub_bd_fops = { | |
1803 | .owner = THIS_MODULE, | |
1804 | .open = ub_bd_open, | |
1805 | .release = ub_bd_release, | |
1806 | .locked_ioctl = ub_bd_ioctl, | |
1807 | .media_changed = ub_bd_media_changed, | |
1808 | .revalidate_disk = ub_bd_revalidate, | |
1809 | }; | |
1810 | ||
1811 | /* | |
1812 | * Common ->done routine for commands executed synchronously. | |
1813 | */ | |
1814 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1815 | { | |
1816 | struct completion *cop = cmd->back; | |
1817 | complete(cop); | |
1818 | } | |
1819 | ||
1820 | /* | |
1821 | * Test if the device has a check condition on it, synchronously. | |
1822 | */ | |
1823 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) | |
1824 | { | |
1825 | struct ub_scsi_cmd *cmd; | |
1826 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; | |
1827 | unsigned long flags; | |
1828 | struct completion compl; | |
1829 | int rc; | |
1830 | ||
1831 | init_completion(&compl); | |
1832 | ||
1833 | rc = -ENOMEM; | |
1834 | if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1835 | goto err_alloc; | |
1836 | ||
1837 | cmd->cdb[0] = TEST_UNIT_READY; | |
1838 | cmd->cdb_len = 6; | |
1839 | cmd->dir = UB_DIR_NONE; | |
1840 | cmd->state = UB_CMDST_INIT; | |
1841 | cmd->lun = lun; /* This may be NULL, but that's ok */ | |
1842 | cmd->done = ub_probe_done; | |
1843 | cmd->back = &compl; | |
1844 | ||
1845 | spin_lock_irqsave(sc->lock, flags); | |
1846 | cmd->tag = sc->tagcnt++; | |
1847 | ||
1848 | rc = ub_submit_scsi(sc, cmd); | |
1849 | spin_unlock_irqrestore(sc->lock, flags); | |
1850 | ||
1851 | if (rc != 0) | |
1852 | goto err_submit; | |
1853 | ||
1854 | wait_for_completion(&compl); | |
1855 | ||
1856 | rc = cmd->error; | |
1857 | ||
1858 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ | |
1859 | rc = cmd->key; | |
1860 | ||
1861 | err_submit: | |
1862 | kfree(cmd); | |
1863 | err_alloc: | |
1864 | return rc; | |
1865 | } | |
1866 | ||
1867 | /* | |
1868 | * Read the SCSI capacity synchronously (for probing). | |
1869 | */ | |
1870 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, | |
1871 | struct ub_capacity *ret) | |
1872 | { | |
1873 | struct ub_scsi_cmd *cmd; | |
1874 | struct scatterlist *sg; | |
1875 | char *p; | |
1876 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; | |
1877 | unsigned long flags; | |
1878 | unsigned int bsize, shift; | |
1879 | unsigned long nsec; | |
1880 | struct completion compl; | |
1881 | int rc; | |
1882 | ||
1883 | init_completion(&compl); | |
1884 | ||
1885 | rc = -ENOMEM; | |
1886 | if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1887 | goto err_alloc; | |
1888 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); | |
1889 | ||
1890 | cmd->cdb[0] = 0x25; | |
1891 | cmd->cdb_len = 10; | |
1892 | cmd->dir = UB_DIR_READ; | |
1893 | cmd->state = UB_CMDST_INIT; | |
1894 | cmd->nsg = 1; | |
1895 | sg = &cmd->sgv[0]; | |
1896 | sg_init_table(sg, UB_MAX_REQ_SG); | |
1897 | sg_set_page(sg, virt_to_page(p), 8, (unsigned long)p & (PAGE_SIZE-1)); | |
1898 | cmd->len = 8; | |
1899 | cmd->lun = lun; | |
1900 | cmd->done = ub_probe_done; | |
1901 | cmd->back = &compl; | |
1902 | ||
1903 | spin_lock_irqsave(sc->lock, flags); | |
1904 | cmd->tag = sc->tagcnt++; | |
1905 | ||
1906 | rc = ub_submit_scsi(sc, cmd); | |
1907 | spin_unlock_irqrestore(sc->lock, flags); | |
1908 | ||
1909 | if (rc != 0) | |
1910 | goto err_submit; | |
1911 | ||
1912 | wait_for_completion(&compl); | |
1913 | ||
1914 | if (cmd->error != 0) { | |
1915 | rc = -EIO; | |
1916 | goto err_read; | |
1917 | } | |
1918 | if (cmd->act_len != 8) { | |
1919 | rc = -EIO; | |
1920 | goto err_read; | |
1921 | } | |
1922 | ||
1923 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ | |
1924 | nsec = be32_to_cpu(*(__be32 *)p) + 1; | |
1925 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); | |
1926 | switch (bsize) { | |
1927 | case 512: shift = 0; break; | |
1928 | case 1024: shift = 1; break; | |
1929 | case 2048: shift = 2; break; | |
1930 | case 4096: shift = 3; break; | |
1931 | default: | |
1932 | rc = -EDOM; | |
1933 | goto err_inv_bsize; | |
1934 | } | |
1935 | ||
1936 | ret->bsize = bsize; | |
1937 | ret->bshift = shift; | |
1938 | ret->nsec = nsec << shift; | |
1939 | rc = 0; | |
1940 | ||
1941 | err_inv_bsize: | |
1942 | err_read: | |
1943 | err_submit: | |
1944 | kfree(cmd); | |
1945 | err_alloc: | |
1946 | return rc; | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | */ | |
1951 | static void ub_probe_urb_complete(struct urb *urb) | |
1952 | { | |
1953 | struct completion *cop = urb->context; | |
1954 | complete(cop); | |
1955 | } | |
1956 | ||
1957 | static void ub_probe_timeout(unsigned long arg) | |
1958 | { | |
1959 | struct completion *cop = (struct completion *) arg; | |
1960 | complete(cop); | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * Reset with a Bulk reset. | |
1965 | */ | |
1966 | static int ub_sync_reset(struct ub_dev *sc) | |
1967 | { | |
1968 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; | |
1969 | struct usb_ctrlrequest *cr; | |
1970 | struct completion compl; | |
1971 | struct timer_list timer; | |
1972 | int rc; | |
1973 | ||
1974 | init_completion(&compl); | |
1975 | ||
1976 | cr = &sc->work_cr; | |
1977 | cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
1978 | cr->bRequest = US_BULK_RESET_REQUEST; | |
1979 | cr->wValue = cpu_to_le16(0); | |
1980 | cr->wIndex = cpu_to_le16(ifnum); | |
1981 | cr->wLength = cpu_to_le16(0); | |
1982 | ||
1983 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1984 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
1985 | ||
1986 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
1987 | printk(KERN_WARNING | |
1988 | "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc); | |
1989 | return rc; | |
1990 | } | |
1991 | ||
1992 | init_timer(&timer); | |
1993 | timer.function = ub_probe_timeout; | |
1994 | timer.data = (unsigned long) &compl; | |
1995 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1996 | add_timer(&timer); | |
1997 | ||
1998 | wait_for_completion(&compl); | |
1999 | ||
2000 | del_timer_sync(&timer); | |
2001 | usb_kill_urb(&sc->work_urb); | |
2002 | ||
2003 | return sc->work_urb.status; | |
2004 | } | |
2005 | ||
2006 | /* | |
2007 | * Get number of LUNs by the way of Bulk GetMaxLUN command. | |
2008 | */ | |
2009 | static int ub_sync_getmaxlun(struct ub_dev *sc) | |
2010 | { | |
2011 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; | |
2012 | unsigned char *p; | |
2013 | enum { ALLOC_SIZE = 1 }; | |
2014 | struct usb_ctrlrequest *cr; | |
2015 | struct completion compl; | |
2016 | struct timer_list timer; | |
2017 | int nluns; | |
2018 | int rc; | |
2019 | ||
2020 | init_completion(&compl); | |
2021 | ||
2022 | rc = -ENOMEM; | |
2023 | if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
2024 | goto err_alloc; | |
2025 | *p = 55; | |
2026 | ||
2027 | cr = &sc->work_cr; | |
2028 | cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
2029 | cr->bRequest = US_BULK_GET_MAX_LUN; | |
2030 | cr->wValue = cpu_to_le16(0); | |
2031 | cr->wIndex = cpu_to_le16(ifnum); | |
2032 | cr->wLength = cpu_to_le16(1); | |
2033 | ||
2034 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, | |
2035 | (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); | |
2036 | ||
2037 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) | |
2038 | goto err_submit; | |
2039 | ||
2040 | init_timer(&timer); | |
2041 | timer.function = ub_probe_timeout; | |
2042 | timer.data = (unsigned long) &compl; | |
2043 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2044 | add_timer(&timer); | |
2045 | ||
2046 | wait_for_completion(&compl); | |
2047 | ||
2048 | del_timer_sync(&timer); | |
2049 | usb_kill_urb(&sc->work_urb); | |
2050 | ||
2051 | if ((rc = sc->work_urb.status) < 0) | |
2052 | goto err_io; | |
2053 | ||
2054 | if (sc->work_urb.actual_length != 1) { | |
2055 | nluns = 0; | |
2056 | } else { | |
2057 | if ((nluns = *p) == 55) { | |
2058 | nluns = 0; | |
2059 | } else { | |
2060 | /* GetMaxLUN returns the maximum LUN number */ | |
2061 | nluns += 1; | |
2062 | if (nluns > UB_MAX_LUNS) | |
2063 | nluns = UB_MAX_LUNS; | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | kfree(p); | |
2068 | return nluns; | |
2069 | ||
2070 | err_io: | |
2071 | err_submit: | |
2072 | kfree(p); | |
2073 | err_alloc: | |
2074 | return rc; | |
2075 | } | |
2076 | ||
2077 | /* | |
2078 | * Clear initial stalls. | |
2079 | */ | |
2080 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) | |
2081 | { | |
2082 | int endp; | |
2083 | struct usb_ctrlrequest *cr; | |
2084 | struct completion compl; | |
2085 | struct timer_list timer; | |
2086 | int rc; | |
2087 | ||
2088 | init_completion(&compl); | |
2089 | ||
2090 | endp = usb_pipeendpoint(stalled_pipe); | |
2091 | if (usb_pipein (stalled_pipe)) | |
2092 | endp |= USB_DIR_IN; | |
2093 | ||
2094 | cr = &sc->work_cr; | |
2095 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
2096 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
2097 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
2098 | cr->wIndex = cpu_to_le16(endp); | |
2099 | cr->wLength = cpu_to_le16(0); | |
2100 | ||
2101 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
2102 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
2103 | ||
2104 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
2105 | printk(KERN_WARNING | |
2106 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); | |
2107 | return rc; | |
2108 | } | |
2109 | ||
2110 | init_timer(&timer); | |
2111 | timer.function = ub_probe_timeout; | |
2112 | timer.data = (unsigned long) &compl; | |
2113 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2114 | add_timer(&timer); | |
2115 | ||
2116 | wait_for_completion(&compl); | |
2117 | ||
2118 | del_timer_sync(&timer); | |
2119 | usb_kill_urb(&sc->work_urb); | |
2120 | ||
2121 | usb_reset_endpoint(sc->dev, endp); | |
2122 | ||
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | /* | |
2127 | * Get the pipe settings. | |
2128 | */ | |
2129 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, | |
2130 | struct usb_interface *intf) | |
2131 | { | |
2132 | struct usb_host_interface *altsetting = intf->cur_altsetting; | |
2133 | struct usb_endpoint_descriptor *ep_in = NULL; | |
2134 | struct usb_endpoint_descriptor *ep_out = NULL; | |
2135 | struct usb_endpoint_descriptor *ep; | |
2136 | int i; | |
2137 | ||
2138 | /* | |
2139 | * Find the endpoints we need. | |
2140 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
2141 | * We will ignore any others. | |
2142 | */ | |
2143 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
2144 | ep = &altsetting->endpoint[i].desc; | |
2145 | ||
2146 | /* Is it a BULK endpoint? */ | |
2147 | if (usb_endpoint_xfer_bulk(ep)) { | |
2148 | /* BULK in or out? */ | |
2149 | if (usb_endpoint_dir_in(ep)) { | |
2150 | if (ep_in == NULL) | |
2151 | ep_in = ep; | |
2152 | } else { | |
2153 | if (ep_out == NULL) | |
2154 | ep_out = ep; | |
2155 | } | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | if (ep_in == NULL || ep_out == NULL) { | |
2160 | printk(KERN_NOTICE "%s: failed endpoint check\n", sc->name); | |
2161 | return -ENODEV; | |
2162 | } | |
2163 | ||
2164 | /* Calculate and store the pipe values */ | |
2165 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); | |
2166 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); | |
2167 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, | |
2168 | usb_endpoint_num(ep_out)); | |
2169 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, | |
2170 | usb_endpoint_num(ep_in)); | |
2171 | ||
2172 | return 0; | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * Probing is done in the process context, which allows us to cheat | |
2177 | * and not to build a state machine for the discovery. | |
2178 | */ | |
2179 | static int ub_probe(struct usb_interface *intf, | |
2180 | const struct usb_device_id *dev_id) | |
2181 | { | |
2182 | struct ub_dev *sc; | |
2183 | int nluns; | |
2184 | int rc; | |
2185 | int i; | |
2186 | ||
2187 | if (usb_usual_check_type(dev_id, USB_US_TYPE_UB)) | |
2188 | return -ENXIO; | |
2189 | ||
2190 | rc = -ENOMEM; | |
2191 | if ((sc = kzalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) | |
2192 | goto err_core; | |
2193 | sc->lock = ub_next_lock(); | |
2194 | INIT_LIST_HEAD(&sc->luns); | |
2195 | usb_init_urb(&sc->work_urb); | |
2196 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); | |
2197 | atomic_set(&sc->poison, 0); | |
2198 | INIT_WORK(&sc->reset_work, ub_reset_task); | |
2199 | init_waitqueue_head(&sc->reset_wait); | |
2200 | ||
2201 | init_timer(&sc->work_timer); | |
2202 | sc->work_timer.data = (unsigned long) sc; | |
2203 | sc->work_timer.function = ub_urb_timeout; | |
2204 | ||
2205 | ub_init_completion(&sc->work_done); | |
2206 | sc->work_done.done = 1; /* A little yuk, but oh well... */ | |
2207 | ||
2208 | sc->dev = interface_to_usbdev(intf); | |
2209 | sc->intf = intf; | |
2210 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
2211 | usb_set_intfdata(intf, sc); | |
2212 | usb_get_dev(sc->dev); | |
2213 | /* | |
2214 | * Since we give the interface struct to the block level through | |
2215 | * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent | |
2216 | * oopses on close after a disconnect (kernels 2.6.16 and up). | |
2217 | */ | |
2218 | usb_get_intf(sc->intf); | |
2219 | ||
2220 | snprintf(sc->name, 12, DRV_NAME "(%d.%d)", | |
2221 | sc->dev->bus->busnum, sc->dev->devnum); | |
2222 | ||
2223 | /* XXX Verify that we can handle the device (from descriptors) */ | |
2224 | ||
2225 | if (ub_get_pipes(sc, sc->dev, intf) != 0) | |
2226 | goto err_dev_desc; | |
2227 | ||
2228 | /* | |
2229 | * At this point, all USB initialization is done, do upper layer. | |
2230 | * We really hate halfway initialized structures, so from the | |
2231 | * invariants perspective, this ub_dev is fully constructed at | |
2232 | * this point. | |
2233 | */ | |
2234 | ||
2235 | /* | |
2236 | * This is needed to clear toggles. It is a problem only if we do | |
2237 | * `rmmod ub && modprobe ub` without disconnects, but we like that. | |
2238 | */ | |
2239 | #if 0 /* iPod Mini fails if we do this (big white iPod works) */ | |
2240 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
2241 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
2242 | #endif | |
2243 | ||
2244 | /* | |
2245 | * The way this is used by the startup code is a little specific. | |
2246 | * A SCSI check causes a USB stall. Our common case code sees it | |
2247 | * and clears the check, after which the device is ready for use. | |
2248 | * But if a check was not present, any command other than | |
2249 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). | |
2250 | * | |
2251 | * If we neglect to clear the SCSI check, the first real command fails | |
2252 | * (which is the capacity readout). We clear that and retry, but why | |
2253 | * causing spurious retries for no reason. | |
2254 | * | |
2255 | * Revalidation may start with its own TEST_UNIT_READY, but that one | |
2256 | * has to succeed, so we clear checks with an additional one here. | |
2257 | * In any case it's not our business how revaliadation is implemented. | |
2258 | */ | |
2259 | for (i = 0; i < 3; i++) { /* Retries for the schwag key from KS'04 */ | |
2260 | if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; | |
2261 | if (rc != 0x6) break; | |
2262 | msleep(10); | |
2263 | } | |
2264 | ||
2265 | nluns = 1; | |
2266 | for (i = 0; i < 3; i++) { | |
2267 | if ((rc = ub_sync_getmaxlun(sc)) < 0) | |
2268 | break; | |
2269 | if (rc != 0) { | |
2270 | nluns = rc; | |
2271 | break; | |
2272 | } | |
2273 | msleep(100); | |
2274 | } | |
2275 | ||
2276 | for (i = 0; i < nluns; i++) { | |
2277 | ub_probe_lun(sc, i); | |
2278 | } | |
2279 | return 0; | |
2280 | ||
2281 | err_dev_desc: | |
2282 | usb_set_intfdata(intf, NULL); | |
2283 | usb_put_intf(sc->intf); | |
2284 | usb_put_dev(sc->dev); | |
2285 | kfree(sc); | |
2286 | err_core: | |
2287 | return rc; | |
2288 | } | |
2289 | ||
2290 | static int ub_probe_lun(struct ub_dev *sc, int lnum) | |
2291 | { | |
2292 | struct ub_lun *lun; | |
2293 | struct request_queue *q; | |
2294 | struct gendisk *disk; | |
2295 | int rc; | |
2296 | ||
2297 | rc = -ENOMEM; | |
2298 | if ((lun = kzalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) | |
2299 | goto err_alloc; | |
2300 | lun->num = lnum; | |
2301 | ||
2302 | rc = -ENOSR; | |
2303 | if ((lun->id = ub_id_get()) == -1) | |
2304 | goto err_id; | |
2305 | ||
2306 | lun->udev = sc; | |
2307 | ||
2308 | snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", | |
2309 | lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); | |
2310 | ||
2311 | lun->removable = 1; /* XXX Query this from the device */ | |
2312 | lun->changed = 1; /* ub_revalidate clears only */ | |
2313 | ub_revalidate(sc, lun); | |
2314 | ||
2315 | rc = -ENOMEM; | |
2316 | if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL) | |
2317 | goto err_diskalloc; | |
2318 | ||
2319 | sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); | |
2320 | disk->major = UB_MAJOR; | |
2321 | disk->first_minor = lun->id * UB_PARTS_PER_LUN; | |
2322 | disk->fops = &ub_bd_fops; | |
2323 | disk->private_data = lun; | |
2324 | disk->driverfs_dev = &sc->intf->dev; | |
2325 | ||
2326 | rc = -ENOMEM; | |
2327 | if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL) | |
2328 | goto err_blkqinit; | |
2329 | ||
2330 | disk->queue = q; | |
2331 | ||
2332 | blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); | |
2333 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); | |
2334 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); | |
2335 | blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ | |
2336 | blk_queue_max_sectors(q, UB_MAX_SECTORS); | |
2337 | blk_queue_hardsect_size(q, lun->capacity.bsize); | |
2338 | ||
2339 | lun->disk = disk; | |
2340 | q->queuedata = lun; | |
2341 | list_add(&lun->link, &sc->luns); | |
2342 | ||
2343 | set_capacity(disk, lun->capacity.nsec); | |
2344 | if (lun->removable) | |
2345 | disk->flags |= GENHD_FL_REMOVABLE; | |
2346 | ||
2347 | add_disk(disk); | |
2348 | ||
2349 | return 0; | |
2350 | ||
2351 | err_blkqinit: | |
2352 | put_disk(disk); | |
2353 | err_diskalloc: | |
2354 | ub_id_put(lun->id); | |
2355 | err_id: | |
2356 | kfree(lun); | |
2357 | err_alloc: | |
2358 | return rc; | |
2359 | } | |
2360 | ||
2361 | static void ub_disconnect(struct usb_interface *intf) | |
2362 | { | |
2363 | struct ub_dev *sc = usb_get_intfdata(intf); | |
2364 | struct ub_lun *lun; | |
2365 | unsigned long flags; | |
2366 | ||
2367 | /* | |
2368 | * Prevent ub_bd_release from pulling the rug from under us. | |
2369 | * XXX This is starting to look like a kref. | |
2370 | * XXX Why not to take this ref at probe time? | |
2371 | */ | |
2372 | spin_lock_irqsave(&ub_lock, flags); | |
2373 | sc->openc++; | |
2374 | spin_unlock_irqrestore(&ub_lock, flags); | |
2375 | ||
2376 | /* | |
2377 | * Fence stall clearings, operations triggered by unlinkings and so on. | |
2378 | * We do not attempt to unlink any URBs, because we do not trust the | |
2379 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. | |
2380 | */ | |
2381 | atomic_set(&sc->poison, 1); | |
2382 | ||
2383 | /* | |
2384 | * Wait for reset to end, if any. | |
2385 | */ | |
2386 | wait_event(sc->reset_wait, !sc->reset); | |
2387 | ||
2388 | /* | |
2389 | * Blow away queued commands. | |
2390 | * | |
2391 | * Actually, this never works, because before we get here | |
2392 | * the HCD terminates outstanding URB(s). It causes our | |
2393 | * SCSI command queue to advance, commands fail to submit, | |
2394 | * and the whole queue drains. So, we just use this code to | |
2395 | * print warnings. | |
2396 | */ | |
2397 | spin_lock_irqsave(sc->lock, flags); | |
2398 | { | |
2399 | struct ub_scsi_cmd *cmd; | |
2400 | int cnt = 0; | |
2401 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { | |
2402 | cmd->error = -ENOTCONN; | |
2403 | cmd->state = UB_CMDST_DONE; | |
2404 | ub_cmdq_pop(sc); | |
2405 | (*cmd->done)(sc, cmd); | |
2406 | cnt++; | |
2407 | } | |
2408 | if (cnt != 0) { | |
2409 | printk(KERN_WARNING "%s: " | |
2410 | "%d was queued after shutdown\n", sc->name, cnt); | |
2411 | } | |
2412 | } | |
2413 | spin_unlock_irqrestore(sc->lock, flags); | |
2414 | ||
2415 | /* | |
2416 | * Unregister the upper layer. | |
2417 | */ | |
2418 | list_for_each_entry(lun, &sc->luns, link) { | |
2419 | del_gendisk(lun->disk); | |
2420 | /* | |
2421 | * I wish I could do: | |
2422 | * queue_flag_set(QUEUE_FLAG_DEAD, q); | |
2423 | * As it is, we rely on our internal poisoning and let | |
2424 | * the upper levels to spin furiously failing all the I/O. | |
2425 | */ | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * Testing for -EINPROGRESS is always a bug, so we are bending | |
2430 | * the rules a little. | |
2431 | */ | |
2432 | spin_lock_irqsave(sc->lock, flags); | |
2433 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ | |
2434 | printk(KERN_WARNING "%s: " | |
2435 | "URB is active after disconnect\n", sc->name); | |
2436 | } | |
2437 | spin_unlock_irqrestore(sc->lock, flags); | |
2438 | ||
2439 | /* | |
2440 | * There is virtually no chance that other CPU runs a timeout so long | |
2441 | * after ub_urb_complete should have called del_timer, but only if HCD | |
2442 | * didn't forget to deliver a callback on unlink. | |
2443 | */ | |
2444 | del_timer_sync(&sc->work_timer); | |
2445 | ||
2446 | /* | |
2447 | * At this point there must be no commands coming from anyone | |
2448 | * and no URBs left in transit. | |
2449 | */ | |
2450 | ||
2451 | ub_put(sc); | |
2452 | } | |
2453 | ||
2454 | static struct usb_driver ub_driver = { | |
2455 | .name = "ub", | |
2456 | .probe = ub_probe, | |
2457 | .disconnect = ub_disconnect, | |
2458 | .id_table = ub_usb_ids, | |
2459 | .pre_reset = ub_pre_reset, | |
2460 | .post_reset = ub_post_reset, | |
2461 | }; | |
2462 | ||
2463 | static int __init ub_init(void) | |
2464 | { | |
2465 | int rc; | |
2466 | int i; | |
2467 | ||
2468 | for (i = 0; i < UB_QLOCK_NUM; i++) | |
2469 | spin_lock_init(&ub_qlockv[i]); | |
2470 | ||
2471 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) | |
2472 | goto err_regblkdev; | |
2473 | ||
2474 | if ((rc = usb_register(&ub_driver)) != 0) | |
2475 | goto err_register; | |
2476 | ||
2477 | usb_usual_set_present(USB_US_TYPE_UB); | |
2478 | return 0; | |
2479 | ||
2480 | err_register: | |
2481 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2482 | err_regblkdev: | |
2483 | return rc; | |
2484 | } | |
2485 | ||
2486 | static void __exit ub_exit(void) | |
2487 | { | |
2488 | usb_deregister(&ub_driver); | |
2489 | ||
2490 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2491 | usb_usual_clear_present(USB_US_TYPE_UB); | |
2492 | } | |
2493 | ||
2494 | module_init(ub_init); | |
2495 | module_exit(ub_exit); | |
2496 | ||
2497 | MODULE_LICENSE("GPL"); |