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 | * -- Do resets with usb_device_reset (needs a thread context, use khubd) |
13 | * -- set readonly flag for CDs, set removable flag for CF readers | |
14 | * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch) | |
1da177e4 LT |
15 | * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries |
16 | * -- verify the 13 conditions and do bulk resets | |
1da177e4 LT |
17 | * -- kill last_pipe and simply do two-state clearing on both pipes |
18 | * -- verify protocol (bulk) from USB descriptors (maybe...) | |
19 | * -- highmem and sg | |
20 | * -- move top_sense and work_bcs into separate allocations (if they survive) | |
21 | * for cache purists and esoteric architectures. | |
22 | * -- prune comments, they are too volumnous | |
23 | * -- Exterminate P3 printks | |
24 | * -- Resove XXX's | |
25 | * -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=? | |
1872bceb | 26 | * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. |
1da177e4 LT |
27 | */ |
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/usb.h> | |
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 LT |
108 | /* |
109 | * Definitions which have to be scattered once we understand the layout better. | |
110 | */ | |
111 | ||
112 | /* Transport (despite PR in the name) */ | |
113 | #define US_PR_BULK 0x50 /* bulk only */ | |
114 | ||
115 | /* Protocol */ | |
116 | #define US_SC_SCSI 0x06 /* Transparent */ | |
117 | ||
118 | /* | |
f4800078 PZ |
119 | * This many LUNs per USB device. |
120 | * Every one of them takes a host, see UB_MAX_HOSTS. | |
1da177e4 | 121 | */ |
9f793d2c | 122 | #define UB_MAX_LUNS 9 |
f4800078 PZ |
123 | |
124 | /* | |
125 | */ | |
126 | ||
1da177e4 LT |
127 | #define UB_MINORS_PER_MAJOR 8 |
128 | ||
129 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ | |
130 | ||
131 | #define UB_SENSE_SIZE 18 | |
132 | ||
133 | /* | |
134 | */ | |
135 | ||
136 | /* command block wrapper */ | |
137 | struct bulk_cb_wrap { | |
138 | __le32 Signature; /* contains 'USBC' */ | |
139 | u32 Tag; /* unique per command id */ | |
140 | __le32 DataTransferLength; /* size of data */ | |
141 | u8 Flags; /* direction in bit 0 */ | |
f4800078 | 142 | u8 Lun; /* LUN */ |
1da177e4 LT |
143 | u8 Length; /* of of the CDB */ |
144 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ | |
145 | }; | |
146 | ||
147 | #define US_BULK_CB_WRAP_LEN 31 | |
148 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ | |
149 | #define US_BULK_FLAG_IN 1 | |
150 | #define US_BULK_FLAG_OUT 0 | |
151 | ||
152 | /* command status wrapper */ | |
153 | struct bulk_cs_wrap { | |
154 | __le32 Signature; /* should = 'USBS' */ | |
155 | u32 Tag; /* same as original command */ | |
156 | __le32 Residue; /* amount not transferred */ | |
157 | u8 Status; /* see below */ | |
158 | }; | |
159 | ||
160 | #define US_BULK_CS_WRAP_LEN 13 | |
161 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ | |
1da177e4 LT |
162 | #define US_BULK_STAT_OK 0 |
163 | #define US_BULK_STAT_FAIL 1 | |
164 | #define US_BULK_STAT_PHASE 2 | |
165 | ||
166 | /* bulk-only class specific requests */ | |
167 | #define US_BULK_RESET_REQUEST 0xff | |
168 | #define US_BULK_GET_MAX_LUN 0xfe | |
169 | ||
170 | /* | |
171 | */ | |
172 | struct ub_dev; | |
173 | ||
174 | #define UB_MAX_REQ_SG 1 | |
175 | #define UB_MAX_SECTORS 64 | |
176 | ||
177 | /* | |
178 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) | |
179 | * even if a webcam hogs the bus, but some devices need time to spin up. | |
180 | */ | |
181 | #define UB_URB_TIMEOUT (HZ*2) | |
182 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ | |
183 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ | |
184 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ | |
185 | ||
186 | /* | |
187 | * An instance of a SCSI command in transit. | |
188 | */ | |
189 | #define UB_DIR_NONE 0 | |
190 | #define UB_DIR_READ 1 | |
191 | #define UB_DIR_ILLEGAL2 2 | |
192 | #define UB_DIR_WRITE 3 | |
193 | ||
194 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ | |
195 | (((c)==UB_DIR_READ)? 'r': 'n')) | |
196 | ||
197 | enum ub_scsi_cmd_state { | |
198 | UB_CMDST_INIT, /* Initial state */ | |
199 | UB_CMDST_CMD, /* Command submitted */ | |
200 | UB_CMDST_DATA, /* Data phase */ | |
201 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ | |
202 | UB_CMDST_STAT, /* Status phase */ | |
203 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ | |
1872bceb | 204 | UB_CMDST_CLRRS, /* Clearing before retrying status */ |
1da177e4 LT |
205 | UB_CMDST_SENSE, /* Sending Request Sense */ |
206 | UB_CMDST_DONE /* Final state */ | |
207 | }; | |
208 | ||
209 | static char *ub_scsi_cmd_stname[] = { | |
210 | ". ", | |
211 | "Cmd", | |
212 | "dat", | |
213 | "c2s", | |
214 | "sts", | |
215 | "clr", | |
1872bceb | 216 | "crs", |
1da177e4 LT |
217 | "Sen", |
218 | "fin" | |
219 | }; | |
220 | ||
221 | struct ub_scsi_cmd { | |
222 | unsigned char cdb[UB_MAX_CDB_SIZE]; | |
223 | unsigned char cdb_len; | |
224 | ||
225 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ | |
226 | unsigned char trace_index; | |
227 | enum ub_scsi_cmd_state state; | |
228 | unsigned int tag; | |
229 | struct ub_scsi_cmd *next; | |
230 | ||
231 | int error; /* Return code - valid upon done */ | |
232 | unsigned int act_len; /* Return size */ | |
233 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ | |
234 | ||
235 | int stat_count; /* Retries getting status. */ | |
236 | ||
237 | /* | |
238 | * We do not support transfers from highmem pages | |
239 | * because the underlying USB framework does not do what we need. | |
240 | */ | |
241 | char *data; /* Requested buffer */ | |
242 | unsigned int len; /* Requested length */ | |
243 | // struct scatterlist sgv[UB_MAX_REQ_SG]; | |
244 | ||
f4800078 | 245 | struct ub_lun *lun; |
1da177e4 LT |
246 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); |
247 | void *back; | |
248 | }; | |
249 | ||
250 | /* | |
251 | */ | |
252 | struct ub_capacity { | |
253 | unsigned long nsec; /* Linux size - 512 byte sectors */ | |
254 | unsigned int bsize; /* Linux hardsect_size */ | |
255 | unsigned int bshift; /* Shift between 512 and hard sects */ | |
256 | }; | |
257 | ||
258 | /* | |
259 | * The SCSI command tracing structure. | |
260 | */ | |
261 | ||
262 | #define SCMD_ST_HIST_SZ 8 | |
263 | #define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */ | |
264 | ||
265 | struct ub_scsi_cmd_trace { | |
266 | int hcur; | |
267 | unsigned int tag; | |
268 | unsigned int req_size, act_size; | |
269 | unsigned char op; | |
270 | unsigned char dir; | |
271 | unsigned char key, asc, ascq; | |
272 | char st_hst[SCMD_ST_HIST_SZ]; | |
273 | }; | |
274 | ||
275 | struct ub_scsi_trace { | |
276 | int cur; | |
277 | struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ]; | |
278 | }; | |
279 | ||
280 | /* | |
281 | * This is a direct take-off from linux/include/completion.h | |
282 | * The difference is that I do not wait on this thing, just poll. | |
283 | * When I want to wait (ub_probe), I just use the stock completion. | |
284 | * | |
285 | * Note that INIT_COMPLETION takes no lock. It is correct. But why | |
286 | * in the bloody hell that thing takes struct instead of pointer to struct | |
287 | * is quite beyond me. I just copied it from the stock completion. | |
288 | */ | |
289 | struct ub_completion { | |
290 | unsigned int done; | |
291 | spinlock_t lock; | |
292 | }; | |
293 | ||
294 | static inline void ub_init_completion(struct ub_completion *x) | |
295 | { | |
296 | x->done = 0; | |
297 | spin_lock_init(&x->lock); | |
298 | } | |
299 | ||
300 | #define UB_INIT_COMPLETION(x) ((x).done = 0) | |
301 | ||
302 | static void ub_complete(struct ub_completion *x) | |
303 | { | |
304 | unsigned long flags; | |
305 | ||
306 | spin_lock_irqsave(&x->lock, flags); | |
307 | x->done++; | |
308 | spin_unlock_irqrestore(&x->lock, flags); | |
309 | } | |
310 | ||
311 | static int ub_is_completed(struct ub_completion *x) | |
312 | { | |
313 | unsigned long flags; | |
314 | int ret; | |
315 | ||
316 | spin_lock_irqsave(&x->lock, flags); | |
317 | ret = x->done; | |
318 | spin_unlock_irqrestore(&x->lock, flags); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | /* | |
323 | */ | |
324 | struct ub_scsi_cmd_queue { | |
325 | int qlen, qmax; | |
326 | struct ub_scsi_cmd *head, *tail; | |
327 | }; | |
328 | ||
329 | /* | |
f4800078 PZ |
330 | * The block device instance (one per LUN). |
331 | */ | |
332 | struct ub_lun { | |
333 | struct ub_dev *udev; | |
334 | struct list_head link; | |
335 | struct gendisk *disk; | |
336 | int id; /* Host index */ | |
337 | int num; /* LUN number */ | |
338 | char name[16]; | |
339 | ||
340 | int changed; /* Media was changed */ | |
341 | int removable; | |
342 | int readonly; | |
343 | int first_open; /* Kludge. See ub_bd_open. */ | |
344 | ||
345 | /* Use Ingo's mempool if or when we have more than one command. */ | |
346 | /* | |
347 | * Currently we never need more than one command for the whole device. | |
348 | * However, giving every LUN a command is a cheap and automatic way | |
349 | * to enforce fairness between them. | |
350 | */ | |
351 | int cmda[1]; | |
352 | struct ub_scsi_cmd cmdv[1]; | |
353 | ||
354 | struct ub_capacity capacity; | |
355 | }; | |
356 | ||
357 | /* | |
358 | * The USB device instance. | |
1da177e4 LT |
359 | */ |
360 | struct ub_dev { | |
361 | spinlock_t lock; | |
1da177e4 LT |
362 | atomic_t poison; /* The USB device is disconnected */ |
363 | int openc; /* protected by ub_lock! */ | |
364 | /* kref is too implicit for our taste */ | |
365 | unsigned int tagcnt; | |
f4800078 | 366 | char name[12]; |
1da177e4 LT |
367 | struct usb_device *dev; |
368 | struct usb_interface *intf; | |
369 | ||
f4800078 | 370 | struct list_head luns; |
1da177e4 LT |
371 | |
372 | unsigned int send_bulk_pipe; /* cached pipe values */ | |
373 | unsigned int recv_bulk_pipe; | |
374 | unsigned int send_ctrl_pipe; | |
375 | unsigned int recv_ctrl_pipe; | |
376 | ||
377 | struct tasklet_struct tasklet; | |
378 | ||
1da177e4 LT |
379 | struct ub_scsi_cmd_queue cmd_queue; |
380 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ | |
381 | unsigned char top_sense[UB_SENSE_SIZE]; | |
382 | ||
383 | struct ub_completion work_done; | |
384 | struct urb work_urb; | |
385 | struct timer_list work_timer; | |
386 | int last_pipe; /* What might need clearing */ | |
1872bceb | 387 | __le32 signature; /* Learned signature */ |
1da177e4 LT |
388 | struct bulk_cb_wrap work_bcb; |
389 | struct bulk_cs_wrap work_bcs; | |
390 | struct usb_ctrlrequest work_cr; | |
391 | ||
392 | struct ub_scsi_trace tr; | |
393 | }; | |
394 | ||
395 | /* | |
396 | */ | |
397 | static void ub_cleanup(struct ub_dev *sc); | |
f4800078 PZ |
398 | static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq); |
399 | static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, | |
400 | struct ub_scsi_cmd *cmd, struct request *rq); | |
1da177e4 LT |
401 | static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
402 | struct request *rq); | |
403 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
404 | static void ub_end_rq(struct request *rq, int uptodate); | |
405 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
406 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt); | |
407 | static void ub_scsi_action(unsigned long _dev); | |
408 | static void ub_scsi_dispatch(struct ub_dev *sc); | |
409 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
410 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); | |
1872bceb | 411 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1da177e4 | 412 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1872bceb | 413 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
1da177e4 LT |
414 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
415 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
416 | int stalled_pipe); | |
417 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); | |
f4800078 PZ |
418 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); |
419 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, | |
420 | struct ub_capacity *ret); | |
421 | static int ub_probe_lun(struct ub_dev *sc, int lnum); | |
1da177e4 LT |
422 | |
423 | /* | |
424 | */ | |
425 | static struct usb_device_id ub_usb_ids[] = { | |
426 | // { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) }, /* SDDR-31 */ | |
427 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, | |
428 | { } | |
429 | }; | |
430 | ||
431 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); | |
432 | ||
433 | /* | |
434 | * Find me a way to identify "next free minor" for add_disk(), | |
435 | * and the array disappears the next day. However, the number of | |
436 | * hosts has something to do with the naming and /proc/partitions. | |
437 | * This has to be thought out in detail before changing. | |
438 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. | |
439 | */ | |
440 | #define UB_MAX_HOSTS 26 | |
441 | static char ub_hostv[UB_MAX_HOSTS]; | |
f4800078 | 442 | |
1da177e4 LT |
443 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ |
444 | ||
445 | /* | |
446 | * The SCSI command tracing procedures. | |
447 | */ | |
448 | ||
449 | static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
450 | { | |
451 | int n; | |
452 | struct ub_scsi_cmd_trace *t; | |
453 | ||
454 | if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0; | |
455 | t = &sc->tr.vec[n]; | |
456 | ||
457 | memset(t, 0, sizeof(struct ub_scsi_cmd_trace)); | |
458 | t->tag = cmd->tag; | |
459 | t->op = cmd->cdb[0]; | |
460 | t->dir = cmd->dir; | |
461 | t->req_size = cmd->len; | |
462 | t->st_hst[0] = cmd->state; | |
463 | ||
464 | sc->tr.cur = n; | |
465 | cmd->trace_index = n; | |
466 | } | |
467 | ||
468 | static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
469 | { | |
470 | int n; | |
471 | struct ub_scsi_cmd_trace *t; | |
472 | ||
473 | t = &sc->tr.vec[cmd->trace_index]; | |
474 | if (t->tag == cmd->tag) { | |
475 | if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0; | |
476 | t->st_hst[n] = cmd->state; | |
477 | t->hcur = n; | |
478 | } | |
479 | } | |
480 | ||
481 | static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
482 | { | |
483 | struct ub_scsi_cmd_trace *t; | |
484 | ||
485 | t = &sc->tr.vec[cmd->trace_index]; | |
486 | if (t->tag == cmd->tag) | |
487 | t->act_size = cmd->act_len; | |
488 | } | |
489 | ||
490 | static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
491 | unsigned char *sense) | |
492 | { | |
493 | struct ub_scsi_cmd_trace *t; | |
494 | ||
495 | t = &sc->tr.vec[cmd->trace_index]; | |
496 | if (t->tag == cmd->tag) { | |
497 | t->key = sense[2] & 0x0F; | |
498 | t->asc = sense[12]; | |
499 | t->ascq = sense[13]; | |
500 | } | |
501 | } | |
502 | ||
74880c06 | 503 | static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr, char *page) |
1da177e4 LT |
504 | { |
505 | struct usb_interface *intf; | |
506 | struct ub_dev *sc; | |
f4800078 PZ |
507 | struct list_head *p; |
508 | struct ub_lun *lun; | |
1da177e4 LT |
509 | int cnt; |
510 | unsigned long flags; | |
511 | int nc, nh; | |
512 | int i, j; | |
513 | struct ub_scsi_cmd_trace *t; | |
514 | ||
515 | intf = to_usb_interface(dev); | |
516 | sc = usb_get_intfdata(intf); | |
517 | if (sc == NULL) | |
518 | return 0; | |
519 | ||
520 | cnt = 0; | |
521 | spin_lock_irqsave(&sc->lock, flags); | |
522 | ||
523 | cnt += sprintf(page + cnt, | |
f4800078 PZ |
524 | "qlen %d qmax %d\n", |
525 | sc->cmd_queue.qlen, sc->cmd_queue.qmax); | |
526 | ||
527 | list_for_each (p, &sc->luns) { | |
528 | lun = list_entry(p, struct ub_lun, link); | |
529 | cnt += sprintf(page + cnt, | |
530 | "lun %u changed %d removable %d readonly %d\n", | |
531 | lun->num, lun->changed, lun->removable, lun->readonly); | |
532 | } | |
1da177e4 LT |
533 | |
534 | if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0; | |
535 | for (j = 0; j < SCMD_TRACE_SZ; j++) { | |
536 | t = &sc->tr.vec[nc]; | |
537 | ||
538 | cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op); | |
539 | if (t->op == REQUEST_SENSE) { | |
540 | cnt += sprintf(page + cnt, " [sense %x %02x %02x]", | |
541 | t->key, t->asc, t->ascq); | |
542 | } else { | |
543 | cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir)); | |
544 | cnt += sprintf(page + cnt, " [%5d %5d]", | |
545 | t->req_size, t->act_size); | |
546 | } | |
547 | if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0; | |
548 | for (i = 0; i < SCMD_ST_HIST_SZ; i++) { | |
549 | cnt += sprintf(page + cnt, " %s", | |
550 | ub_scsi_cmd_stname[(int)t->st_hst[nh]]); | |
551 | if (++nh == SCMD_ST_HIST_SZ) nh = 0; | |
552 | } | |
553 | cnt += sprintf(page + cnt, "\n"); | |
554 | ||
555 | if (++nc == SCMD_TRACE_SZ) nc = 0; | |
556 | } | |
557 | ||
558 | spin_unlock_irqrestore(&sc->lock, flags); | |
559 | return cnt; | |
560 | } | |
561 | ||
562 | static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */ | |
563 | ||
564 | /* | |
565 | * The id allocator. | |
566 | * | |
567 | * This also stores the host for indexing by minor, which is somewhat dirty. | |
568 | */ | |
569 | static int ub_id_get(void) | |
570 | { | |
571 | unsigned long flags; | |
572 | int i; | |
573 | ||
574 | spin_lock_irqsave(&ub_lock, flags); | |
575 | for (i = 0; i < UB_MAX_HOSTS; i++) { | |
576 | if (ub_hostv[i] == 0) { | |
577 | ub_hostv[i] = 1; | |
578 | spin_unlock_irqrestore(&ub_lock, flags); | |
579 | return i; | |
580 | } | |
581 | } | |
582 | spin_unlock_irqrestore(&ub_lock, flags); | |
583 | return -1; | |
584 | } | |
585 | ||
586 | static void ub_id_put(int id) | |
587 | { | |
588 | unsigned long flags; | |
589 | ||
590 | if (id < 0 || id >= UB_MAX_HOSTS) { | |
591 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); | |
592 | return; | |
593 | } | |
594 | ||
595 | spin_lock_irqsave(&ub_lock, flags); | |
596 | if (ub_hostv[id] == 0) { | |
597 | spin_unlock_irqrestore(&ub_lock, flags); | |
598 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); | |
599 | return; | |
600 | } | |
601 | ub_hostv[id] = 0; | |
602 | spin_unlock_irqrestore(&ub_lock, flags); | |
603 | } | |
604 | ||
605 | /* | |
606 | * Downcount for deallocation. This rides on two assumptions: | |
607 | * - once something is poisoned, its refcount cannot grow | |
608 | * - opens cannot happen at this time (del_gendisk was done) | |
609 | * If the above is true, we can drop the lock, which we need for | |
610 | * blk_cleanup_queue(): the silly thing may attempt to sleep. | |
611 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] | |
612 | */ | |
613 | static void ub_put(struct ub_dev *sc) | |
614 | { | |
615 | unsigned long flags; | |
616 | ||
617 | spin_lock_irqsave(&ub_lock, flags); | |
618 | --sc->openc; | |
619 | if (sc->openc == 0 && atomic_read(&sc->poison)) { | |
620 | spin_unlock_irqrestore(&ub_lock, flags); | |
621 | ub_cleanup(sc); | |
622 | } else { | |
623 | spin_unlock_irqrestore(&ub_lock, flags); | |
624 | } | |
625 | } | |
626 | ||
627 | /* | |
628 | * Final cleanup and deallocation. | |
629 | */ | |
630 | static void ub_cleanup(struct ub_dev *sc) | |
631 | { | |
f4800078 PZ |
632 | struct list_head *p; |
633 | struct ub_lun *lun; | |
1da177e4 LT |
634 | request_queue_t *q; |
635 | ||
f4800078 PZ |
636 | while (!list_empty(&sc->luns)) { |
637 | p = sc->luns.next; | |
638 | lun = list_entry(p, struct ub_lun, link); | |
639 | list_del(p); | |
1da177e4 | 640 | |
f4800078 PZ |
641 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ |
642 | if ((q = lun->disk->queue) != NULL) | |
643 | blk_cleanup_queue(q); | |
644 | /* | |
645 | * If we zero disk->private_data BEFORE put_disk, we have | |
646 | * to check for NULL all over the place in open, release, | |
647 | * check_media and revalidate, because the block level | |
648 | * semaphore is well inside the put_disk. | |
649 | * But we cannot zero after the call, because *disk is gone. | |
650 | * The sd.c is blatantly racy in this area. | |
651 | */ | |
652 | /* disk->private_data = NULL; */ | |
653 | put_disk(lun->disk); | |
654 | lun->disk = NULL; | |
655 | ||
656 | ub_id_put(lun->id); | |
657 | kfree(lun); | |
658 | } | |
1da177e4 | 659 | |
1da177e4 LT |
660 | kfree(sc); |
661 | } | |
662 | ||
663 | /* | |
664 | * The "command allocator". | |
665 | */ | |
f4800078 | 666 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) |
1da177e4 LT |
667 | { |
668 | struct ub_scsi_cmd *ret; | |
669 | ||
f4800078 | 670 | if (lun->cmda[0]) |
1da177e4 | 671 | return NULL; |
f4800078 PZ |
672 | ret = &lun->cmdv[0]; |
673 | lun->cmda[0] = 1; | |
1da177e4 LT |
674 | return ret; |
675 | } | |
676 | ||
f4800078 | 677 | static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) |
1da177e4 | 678 | { |
f4800078 | 679 | if (cmd != &lun->cmdv[0]) { |
1da177e4 | 680 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", |
f4800078 | 681 | lun->name, cmd); |
1da177e4 LT |
682 | return; |
683 | } | |
f4800078 PZ |
684 | if (!lun->cmda[0]) { |
685 | printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); | |
1da177e4 LT |
686 | return; |
687 | } | |
f4800078 | 688 | lun->cmda[0] = 0; |
1da177e4 LT |
689 | } |
690 | ||
691 | /* | |
692 | * The command queue. | |
693 | */ | |
694 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
695 | { | |
696 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
697 | ||
698 | if (t->qlen++ == 0) { | |
699 | t->head = cmd; | |
700 | t->tail = cmd; | |
701 | } else { | |
702 | t->tail->next = cmd; | |
703 | t->tail = cmd; | |
704 | } | |
705 | ||
706 | if (t->qlen > t->qmax) | |
707 | t->qmax = t->qlen; | |
708 | } | |
709 | ||
710 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
711 | { | |
712 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
713 | ||
714 | if (t->qlen++ == 0) { | |
715 | t->head = cmd; | |
716 | t->tail = cmd; | |
717 | } else { | |
718 | cmd->next = t->head; | |
719 | t->head = cmd; | |
720 | } | |
721 | ||
722 | if (t->qlen > t->qmax) | |
723 | t->qmax = t->qlen; | |
724 | } | |
725 | ||
726 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) | |
727 | { | |
728 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
729 | struct ub_scsi_cmd *cmd; | |
730 | ||
731 | if (t->qlen == 0) | |
732 | return NULL; | |
733 | if (--t->qlen == 0) | |
734 | t->tail = NULL; | |
735 | cmd = t->head; | |
736 | t->head = cmd->next; | |
737 | cmd->next = NULL; | |
738 | return cmd; | |
739 | } | |
740 | ||
741 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) | |
742 | ||
743 | /* | |
744 | * The request function is our main entry point | |
745 | */ | |
746 | ||
747 | static void ub_bd_rq_fn(request_queue_t *q) | |
748 | { | |
f4800078 | 749 | struct ub_lun *lun = q->queuedata; |
1da177e4 LT |
750 | struct request *rq; |
751 | ||
752 | while ((rq = elv_next_request(q)) != NULL) { | |
f4800078 | 753 | if (ub_bd_rq_fn_1(lun, rq) != 0) { |
1da177e4 LT |
754 | blk_stop_queue(q); |
755 | break; | |
756 | } | |
757 | } | |
758 | } | |
759 | ||
f4800078 | 760 | static int ub_bd_rq_fn_1(struct ub_lun *lun, struct request *rq) |
1da177e4 | 761 | { |
f4800078 | 762 | struct ub_dev *sc = lun->udev; |
1da177e4 LT |
763 | struct ub_scsi_cmd *cmd; |
764 | int rc; | |
765 | ||
f4800078 | 766 | if (atomic_read(&sc->poison) || lun->changed) { |
1da177e4 LT |
767 | blkdev_dequeue_request(rq); |
768 | ub_end_rq(rq, 0); | |
769 | return 0; | |
770 | } | |
771 | ||
f4800078 | 772 | if ((cmd = ub_get_cmd(lun)) == NULL) |
1da177e4 LT |
773 | return -1; |
774 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
775 | ||
776 | blkdev_dequeue_request(rq); | |
777 | ||
778 | if (blk_pc_request(rq)) { | |
779 | rc = ub_cmd_build_packet(sc, cmd, rq); | |
780 | } else { | |
f4800078 | 781 | rc = ub_cmd_build_block(sc, lun, cmd, rq); |
1da177e4 LT |
782 | } |
783 | if (rc != 0) { | |
f4800078 | 784 | ub_put_cmd(lun, cmd); |
1da177e4 | 785 | ub_end_rq(rq, 0); |
1da177e4 LT |
786 | return 0; |
787 | } | |
1da177e4 | 788 | cmd->state = UB_CMDST_INIT; |
f4800078 | 789 | cmd->lun = lun; |
1da177e4 LT |
790 | cmd->done = ub_rw_cmd_done; |
791 | cmd->back = rq; | |
792 | ||
793 | cmd->tag = sc->tagcnt++; | |
794 | if ((rc = ub_submit_scsi(sc, cmd)) != 0) { | |
f4800078 | 795 | ub_put_cmd(lun, cmd); |
1da177e4 | 796 | ub_end_rq(rq, 0); |
1da177e4 LT |
797 | return 0; |
798 | } | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
f4800078 PZ |
803 | static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
804 | struct ub_scsi_cmd *cmd, struct request *rq) | |
1da177e4 LT |
805 | { |
806 | int ub_dir; | |
807 | #if 0 /* We use rq->buffer for now */ | |
808 | struct scatterlist *sg; | |
809 | int n_elem; | |
810 | #endif | |
811 | unsigned int block, nblks; | |
812 | ||
813 | if (rq_data_dir(rq) == WRITE) | |
814 | ub_dir = UB_DIR_WRITE; | |
815 | else | |
816 | ub_dir = UB_DIR_READ; | |
817 | ||
818 | /* | |
819 | * get scatterlist from block layer | |
820 | */ | |
821 | #if 0 /* We use rq->buffer for now */ | |
822 | sg = &cmd->sgv[0]; | |
823 | n_elem = blk_rq_map_sg(q, rq, sg); | |
824 | if (n_elem <= 0) { | |
f4800078 | 825 | ub_put_cmd(lun, cmd); |
1da177e4 LT |
826 | ub_end_rq(rq, 0); |
827 | blk_start_queue(q); | |
828 | return 0; /* request with no s/g entries? */ | |
829 | } | |
830 | ||
831 | if (n_elem != 1) { /* Paranoia */ | |
832 | printk(KERN_WARNING "%s: request with %d segments\n", | |
833 | sc->name, n_elem); | |
f4800078 | 834 | ub_put_cmd(lun, cmd); |
1da177e4 LT |
835 | ub_end_rq(rq, 0); |
836 | blk_start_queue(q); | |
837 | return 0; | |
838 | } | |
839 | #endif | |
840 | ||
841 | /* | |
842 | * XXX Unfortunately, this check does not work. It is quite possible | |
843 | * to get bogus non-null rq->buffer if you allow sg by mistake. | |
844 | */ | |
845 | if (rq->buffer == NULL) { | |
846 | /* | |
847 | * This must not happen if we set the queue right. | |
848 | * The block level must create bounce buffers for us. | |
849 | */ | |
850 | static int do_print = 1; | |
851 | if (do_print) { | |
852 | printk(KERN_WARNING "%s: unmapped block request" | |
853 | " flags 0x%lx sectors %lu\n", | |
854 | sc->name, rq->flags, rq->nr_sectors); | |
855 | do_print = 0; | |
856 | } | |
857 | return -1; | |
858 | } | |
859 | ||
860 | /* | |
861 | * build the command | |
862 | * | |
863 | * The call to blk_queue_hardsect_size() guarantees that request | |
864 | * is aligned, but it is given in terms of 512 byte units, always. | |
865 | */ | |
f4800078 PZ |
866 | block = rq->sector >> lun->capacity.bshift; |
867 | nblks = rq->nr_sectors >> lun->capacity.bshift; | |
1da177e4 LT |
868 | |
869 | cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10; | |
870 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ | |
871 | cmd->cdb[2] = block >> 24; | |
872 | cmd->cdb[3] = block >> 16; | |
873 | cmd->cdb[4] = block >> 8; | |
874 | cmd->cdb[5] = block; | |
875 | cmd->cdb[7] = nblks >> 8; | |
876 | cmd->cdb[8] = nblks; | |
877 | cmd->cdb_len = 10; | |
878 | ||
879 | cmd->dir = ub_dir; | |
880 | cmd->data = rq->buffer; | |
881 | cmd->len = rq->nr_sectors * 512; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
887 | struct request *rq) | |
888 | { | |
889 | ||
890 | if (rq->data_len != 0 && rq->data == NULL) { | |
891 | static int do_print = 1; | |
892 | if (do_print) { | |
893 | printk(KERN_WARNING "%s: unmapped packet request" | |
894 | " flags 0x%lx length %d\n", | |
895 | sc->name, rq->flags, rq->data_len); | |
896 | do_print = 0; | |
897 | } | |
898 | return -1; | |
899 | } | |
900 | ||
901 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); | |
902 | cmd->cdb_len = rq->cmd_len; | |
903 | ||
904 | if (rq->data_len == 0) { | |
905 | cmd->dir = UB_DIR_NONE; | |
906 | } else { | |
907 | if (rq_data_dir(rq) == WRITE) | |
908 | cmd->dir = UB_DIR_WRITE; | |
909 | else | |
910 | cmd->dir = UB_DIR_READ; | |
911 | } | |
912 | cmd->data = rq->data; | |
913 | cmd->len = rq->data_len; | |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
918 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
919 | { | |
920 | struct request *rq = cmd->back; | |
f4800078 PZ |
921 | struct ub_lun *lun = cmd->lun; |
922 | struct gendisk *disk = lun->disk; | |
1da177e4 LT |
923 | request_queue_t *q = disk->queue; |
924 | int uptodate; | |
925 | ||
926 | if (blk_pc_request(rq)) { | |
927 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ | |
928 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); | |
929 | rq->sense_len = UB_SENSE_SIZE; | |
930 | } | |
931 | ||
932 | if (cmd->error == 0) | |
933 | uptodate = 1; | |
934 | else | |
935 | uptodate = 0; | |
936 | ||
f4800078 | 937 | ub_put_cmd(lun, cmd); |
1da177e4 LT |
938 | ub_end_rq(rq, uptodate); |
939 | blk_start_queue(q); | |
940 | } | |
941 | ||
942 | static void ub_end_rq(struct request *rq, int uptodate) | |
943 | { | |
944 | int rc; | |
945 | ||
946 | rc = end_that_request_first(rq, uptodate, rq->hard_nr_sectors); | |
947 | // assert(rc == 0); | |
948 | end_that_request_last(rq); | |
949 | } | |
950 | ||
951 | /* | |
952 | * Submit a regular SCSI operation (not an auto-sense). | |
953 | * | |
954 | * The Iron Law of Good Submit Routine is: | |
955 | * Zero return - callback is done, Nonzero return - callback is not done. | |
956 | * No exceptions. | |
957 | * | |
958 | * Host is assumed locked. | |
959 | * | |
960 | * XXX We only support Bulk for the moment. | |
961 | */ | |
962 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
963 | { | |
964 | ||
965 | if (cmd->state != UB_CMDST_INIT || | |
966 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { | |
967 | return -EINVAL; | |
968 | } | |
969 | ||
970 | ub_cmdq_add(sc, cmd); | |
971 | /* | |
972 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little | |
973 | * safer to jump to a tasklet, in case upper layers do something silly. | |
974 | */ | |
975 | tasklet_schedule(&sc->tasklet); | |
976 | return 0; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Submit the first URB for the queued command. | |
981 | * This function does not deal with queueing in any way. | |
982 | */ | |
983 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
984 | { | |
985 | struct bulk_cb_wrap *bcb; | |
986 | int rc; | |
987 | ||
988 | bcb = &sc->work_bcb; | |
989 | ||
990 | /* | |
991 | * ``If the allocation length is eighteen or greater, and a device | |
992 | * server returns less than eithteen bytes of data, the application | |
993 | * client should assume that the bytes not transferred would have been | |
994 | * zeroes had the device server returned those bytes.'' | |
995 | * | |
996 | * We zero sense for all commands so that when a packet request | |
997 | * fails it does not return a stale sense. | |
998 | */ | |
999 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); | |
1000 | ||
1001 | /* set up the command wrapper */ | |
1002 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1003 | bcb->Tag = cmd->tag; /* Endianness is not important */ | |
1004 | bcb->DataTransferLength = cpu_to_le32(cmd->len); | |
1005 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; | |
f4800078 | 1006 | bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; |
1da177e4 LT |
1007 | bcb->Length = cmd->cdb_len; |
1008 | ||
1009 | /* copy the command payload */ | |
1010 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); | |
1011 | ||
1012 | UB_INIT_COMPLETION(sc->work_done); | |
1013 | ||
1014 | sc->last_pipe = sc->send_bulk_pipe; | |
1015 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, | |
1016 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); | |
1017 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1018 | ||
1019 | /* Fill what we shouldn't be filling, because usb-storage did so. */ | |
1020 | sc->work_urb.actual_length = 0; | |
1021 | sc->work_urb.error_count = 0; | |
1022 | sc->work_urb.status = 0; | |
1023 | ||
1024 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1025 | /* XXX Clear stalls */ | |
1026 | printk("ub: cmd #%d start failed (%d)\n", cmd->tag, rc); /* P3 */ | |
1027 | ub_complete(&sc->work_done); | |
1028 | return rc; | |
1029 | } | |
1030 | ||
1031 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; | |
1032 | add_timer(&sc->work_timer); | |
1033 | ||
1034 | cmd->state = UB_CMDST_CMD; | |
1035 | ub_cmdtr_state(sc, cmd); | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Timeout handler. | |
1041 | */ | |
1042 | static void ub_urb_timeout(unsigned long arg) | |
1043 | { | |
1044 | struct ub_dev *sc = (struct ub_dev *) arg; | |
1045 | unsigned long flags; | |
1046 | ||
1047 | spin_lock_irqsave(&sc->lock, flags); | |
1048 | usb_unlink_urb(&sc->work_urb); | |
1049 | spin_unlock_irqrestore(&sc->lock, flags); | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Completion routine for the work URB. | |
1054 | * | |
1055 | * This can be called directly from usb_submit_urb (while we have | |
1056 | * the sc->lock taken) and from an interrupt (while we do NOT have | |
1057 | * the sc->lock taken). Therefore, bounce this off to a tasklet. | |
1058 | */ | |
1059 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt) | |
1060 | { | |
1061 | struct ub_dev *sc = urb->context; | |
1062 | ||
1063 | ub_complete(&sc->work_done); | |
1064 | tasklet_schedule(&sc->tasklet); | |
1065 | } | |
1066 | ||
1067 | static void ub_scsi_action(unsigned long _dev) | |
1068 | { | |
1069 | struct ub_dev *sc = (struct ub_dev *) _dev; | |
1070 | unsigned long flags; | |
1071 | ||
1072 | spin_lock_irqsave(&sc->lock, flags); | |
1073 | del_timer(&sc->work_timer); | |
1074 | ub_scsi_dispatch(sc); | |
1075 | spin_unlock_irqrestore(&sc->lock, flags); | |
1076 | } | |
1077 | ||
1078 | static void ub_scsi_dispatch(struct ub_dev *sc) | |
1079 | { | |
1080 | struct ub_scsi_cmd *cmd; | |
1081 | int rc; | |
1082 | ||
1083 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { | |
1084 | if (cmd->state == UB_CMDST_DONE) { | |
1085 | ub_cmdq_pop(sc); | |
1086 | (*cmd->done)(sc, cmd); | |
1087 | } else if (cmd->state == UB_CMDST_INIT) { | |
1088 | ub_cmdtr_new(sc, cmd); | |
1089 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) | |
1090 | break; | |
1091 | cmd->error = rc; | |
1092 | cmd->state = UB_CMDST_DONE; | |
1093 | ub_cmdtr_state(sc, cmd); | |
1094 | } else { | |
1095 | if (!ub_is_completed(&sc->work_done)) | |
1096 | break; | |
1097 | ub_scsi_urb_compl(sc, cmd); | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1103 | { | |
1104 | struct urb *urb = &sc->work_urb; | |
1105 | struct bulk_cs_wrap *bcs; | |
1106 | int pipe; | |
1107 | int rc; | |
1108 | ||
1109 | if (atomic_read(&sc->poison)) { | |
1110 | /* A little too simplistic, I feel... */ | |
1111 | goto Bad_End; | |
1112 | } | |
1113 | ||
1114 | if (cmd->state == UB_CMDST_CLEAR) { | |
1115 | if (urb->status == -EPIPE) { | |
1116 | /* | |
1117 | * STALL while clearning STALL. | |
1118 | * The control pipe clears itself - nothing to do. | |
1119 | * XXX Might try to reset the device here and retry. | |
1120 | */ | |
f4800078 PZ |
1121 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
1122 | sc->name); | |
1da177e4 LT |
1123 | goto Bad_End; |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * We ignore the result for the halt clear. | |
1128 | */ | |
1129 | ||
1130 | /* reset the endpoint toggle */ | |
1131 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1132 | usb_pipeout(sc->last_pipe), 0); | |
1133 | ||
1134 | ub_state_sense(sc, cmd); | |
1135 | ||
1136 | } else if (cmd->state == UB_CMDST_CLR2STS) { | |
1137 | if (urb->status == -EPIPE) { | |
1138 | /* | |
1139 | * STALL while clearning STALL. | |
1140 | * The control pipe clears itself - nothing to do. | |
1141 | * XXX Might try to reset the device here and retry. | |
1142 | */ | |
f4800078 PZ |
1143 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
1144 | sc->name); | |
1da177e4 LT |
1145 | goto Bad_End; |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * We ignore the result for the halt clear. | |
1150 | */ | |
1151 | ||
1152 | /* reset the endpoint toggle */ | |
1153 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1154 | usb_pipeout(sc->last_pipe), 0); | |
1155 | ||
1156 | ub_state_stat(sc, cmd); | |
1157 | ||
1872bceb PZ |
1158 | } else if (cmd->state == UB_CMDST_CLRRS) { |
1159 | if (urb->status == -EPIPE) { | |
1160 | /* | |
1161 | * STALL while clearning STALL. | |
1162 | * The control pipe clears itself - nothing to do. | |
1163 | * XXX Might try to reset the device here and retry. | |
1164 | */ | |
1165 | printk(KERN_NOTICE "%s: stall on control pipe\n", | |
1166 | sc->name); | |
1167 | goto Bad_End; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * We ignore the result for the halt clear. | |
1172 | */ | |
1173 | ||
1174 | /* reset the endpoint toggle */ | |
1175 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1176 | usb_pipeout(sc->last_pipe), 0); | |
1177 | ||
1178 | ub_state_stat_counted(sc, cmd); | |
1179 | ||
1da177e4 LT |
1180 | } else if (cmd->state == UB_CMDST_CMD) { |
1181 | if (urb->status == -EPIPE) { | |
1182 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1183 | if (rc != 0) { | |
1184 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1185 | "unable to submit clear (%d)\n", |
1186 | sc->name, rc); | |
1da177e4 LT |
1187 | /* |
1188 | * This is typically ENOMEM or some other such shit. | |
1189 | * Retrying is pointless. Just do Bad End on it... | |
1190 | */ | |
1191 | goto Bad_End; | |
1192 | } | |
1193 | cmd->state = UB_CMDST_CLEAR; | |
1194 | ub_cmdtr_state(sc, cmd); | |
1195 | return; | |
1196 | } | |
1197 | if (urb->status != 0) { | |
1198 | printk("ub: cmd #%d cmd status (%d)\n", cmd->tag, urb->status); /* P3 */ | |
1199 | goto Bad_End; | |
1200 | } | |
1201 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { | |
1202 | printk("ub: cmd #%d xferred %d\n", cmd->tag, urb->actual_length); /* P3 */ | |
1203 | /* XXX Must do reset here to unconfuse the device */ | |
1204 | goto Bad_End; | |
1205 | } | |
1206 | ||
1207 | if (cmd->dir == UB_DIR_NONE) { | |
1208 | ub_state_stat(sc, cmd); | |
1209 | return; | |
1210 | } | |
1211 | ||
1212 | UB_INIT_COMPLETION(sc->work_done); | |
1213 | ||
1214 | if (cmd->dir == UB_DIR_READ) | |
1215 | pipe = sc->recv_bulk_pipe; | |
1216 | else | |
1217 | pipe = sc->send_bulk_pipe; | |
1218 | sc->last_pipe = pipe; | |
1219 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, | |
1220 | cmd->data, cmd->len, ub_urb_complete, sc); | |
1221 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1222 | sc->work_urb.actual_length = 0; | |
1223 | sc->work_urb.error_count = 0; | |
1224 | sc->work_urb.status = 0; | |
1225 | ||
1226 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1227 | /* XXX Clear stalls */ | |
1228 | printk("ub: data #%d submit failed (%d)\n", cmd->tag, rc); /* P3 */ | |
1229 | ub_complete(&sc->work_done); | |
1230 | ub_state_done(sc, cmd, rc); | |
1231 | return; | |
1232 | } | |
1233 | ||
1234 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; | |
1235 | add_timer(&sc->work_timer); | |
1236 | ||
1237 | cmd->state = UB_CMDST_DATA; | |
1238 | ub_cmdtr_state(sc, cmd); | |
1239 | ||
1240 | } else if (cmd->state == UB_CMDST_DATA) { | |
1241 | if (urb->status == -EPIPE) { | |
1242 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1243 | if (rc != 0) { | |
1244 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1245 | "unable to submit clear (%d)\n", |
1246 | sc->name, rc); | |
1da177e4 LT |
1247 | /* |
1248 | * This is typically ENOMEM or some other such shit. | |
1249 | * Retrying is pointless. Just do Bad End on it... | |
1250 | */ | |
1251 | goto Bad_End; | |
1252 | } | |
1253 | cmd->state = UB_CMDST_CLR2STS; | |
1254 | ub_cmdtr_state(sc, cmd); | |
1255 | return; | |
1256 | } | |
1257 | if (urb->status == -EOVERFLOW) { | |
1258 | /* | |
1259 | * A babble? Failure, but we must transfer CSW now. | |
1260 | */ | |
1261 | cmd->error = -EOVERFLOW; /* A cheap trick... */ | |
1262 | } else { | |
1263 | if (urb->status != 0) | |
1264 | goto Bad_End; | |
1265 | } | |
1266 | ||
1267 | cmd->act_len = urb->actual_length; | |
1268 | ub_cmdtr_act_len(sc, cmd); | |
1269 | ||
1270 | ub_state_stat(sc, cmd); | |
1271 | ||
1272 | } else if (cmd->state == UB_CMDST_STAT) { | |
1273 | if (urb->status == -EPIPE) { | |
1274 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1275 | if (rc != 0) { | |
1276 | printk(KERN_NOTICE "%s: " | |
f4800078 PZ |
1277 | "unable to submit clear (%d)\n", |
1278 | sc->name, rc); | |
1da177e4 LT |
1279 | /* |
1280 | * This is typically ENOMEM or some other such shit. | |
1281 | * Retrying is pointless. Just do Bad End on it... | |
1282 | */ | |
1283 | goto Bad_End; | |
1284 | } | |
1872bceb PZ |
1285 | |
1286 | /* | |
1287 | * Having a stall when getting CSW is an error, so | |
1288 | * make sure uppper levels are not oblivious to it. | |
1289 | */ | |
1290 | cmd->error = -EIO; /* A cheap trick... */ | |
1291 | ||
1292 | cmd->state = UB_CMDST_CLRRS; | |
1da177e4 LT |
1293 | ub_cmdtr_state(sc, cmd); |
1294 | return; | |
1295 | } | |
1872bceb PZ |
1296 | if (urb->status == -EOVERFLOW) { |
1297 | /* | |
1298 | * XXX We are screwed here. Retrying is pointless, | |
1299 | * because the pipelined data will not get in until | |
1300 | * we read with a big enough buffer. We must reset XXX. | |
1301 | */ | |
1302 | goto Bad_End; | |
1303 | } | |
1da177e4 LT |
1304 | if (urb->status != 0) |
1305 | goto Bad_End; | |
1306 | ||
1307 | if (urb->actual_length == 0) { | |
1872bceb | 1308 | ub_state_stat_counted(sc, cmd); |
1da177e4 LT |
1309 | return; |
1310 | } | |
1311 | ||
1312 | /* | |
1313 | * Check the returned Bulk protocol status. | |
1872bceb | 1314 | * The status block has to be validated first. |
1da177e4 LT |
1315 | */ |
1316 | ||
1317 | bcs = &sc->work_bcs; | |
1872bceb PZ |
1318 | |
1319 | if (sc->signature == cpu_to_le32(0)) { | |
1da177e4 | 1320 | /* |
1872bceb PZ |
1321 | * This is the first reply, so do not perform the check. |
1322 | * Instead, remember the signature the device uses | |
1323 | * for future checks. But do not allow a nul. | |
1da177e4 | 1324 | */ |
1872bceb PZ |
1325 | sc->signature = bcs->Signature; |
1326 | if (sc->signature == cpu_to_le32(0)) { | |
1327 | ub_state_stat_counted(sc, cmd); | |
1328 | return; | |
1329 | } | |
1330 | } else { | |
1331 | if (bcs->Signature != sc->signature) { | |
1332 | ub_state_stat_counted(sc, cmd); | |
1333 | return; | |
1334 | } | |
1da177e4 | 1335 | } |
1da177e4 LT |
1336 | |
1337 | if (bcs->Tag != cmd->tag) { | |
1338 | /* | |
1339 | * This usually happens when we disagree with the | |
1340 | * device's microcode about something. For instance, | |
1341 | * a few of them throw this after timeouts. They buffer | |
1342 | * commands and reply at commands we timed out before. | |
1343 | * Without flushing these replies we loop forever. | |
1344 | */ | |
1872bceb | 1345 | ub_state_stat_counted(sc, cmd); |
1da177e4 LT |
1346 | return; |
1347 | } | |
1348 | ||
1872bceb PZ |
1349 | rc = le32_to_cpu(bcs->Residue); |
1350 | if (rc != cmd->len - cmd->act_len) { | |
1351 | /* | |
1352 | * It is all right to transfer less, the caller has | |
1353 | * to check. But it's not all right if the device | |
1354 | * counts disagree with our counts. | |
1355 | */ | |
1356 | /* P3 */ printk("%s: resid %d len %d act %d\n", | |
1357 | sc->name, rc, cmd->len, cmd->act_len); | |
1358 | goto Bad_End; | |
1359 | } | |
1360 | ||
1da177e4 LT |
1361 | switch (bcs->Status) { |
1362 | case US_BULK_STAT_OK: | |
1363 | break; | |
1364 | case US_BULK_STAT_FAIL: | |
1365 | ub_state_sense(sc, cmd); | |
1366 | return; | |
1367 | case US_BULK_STAT_PHASE: | |
1368 | /* XXX We must reset the transport here */ | |
1369 | /* P3 */ printk("%s: status PHASE\n", sc->name); | |
1370 | goto Bad_End; | |
1371 | default: | |
1372 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", | |
1373 | sc->name, bcs->Status); | |
1374 | goto Bad_End; | |
1375 | } | |
1376 | ||
1377 | /* Not zeroing error to preserve a babble indicator */ | |
1872bceb PZ |
1378 | if (cmd->error != 0) { |
1379 | ub_state_sense(sc, cmd); | |
1380 | return; | |
1381 | } | |
1da177e4 LT |
1382 | cmd->state = UB_CMDST_DONE; |
1383 | ub_cmdtr_state(sc, cmd); | |
1384 | ub_cmdq_pop(sc); | |
1385 | (*cmd->done)(sc, cmd); | |
1386 | ||
1387 | } else if (cmd->state == UB_CMDST_SENSE) { | |
1388 | ub_state_done(sc, cmd, -EIO); | |
1389 | ||
1390 | } else { | |
1391 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1392 | "wrong command state %d\n", |
1393 | sc->name, cmd->state); | |
1da177e4 LT |
1394 | goto Bad_End; |
1395 | } | |
1396 | return; | |
1397 | ||
1398 | Bad_End: /* Little Excel is dead */ | |
1399 | ub_state_done(sc, cmd, -EIO); | |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Factorization helper for the command state machine: | |
1404 | * Finish the command. | |
1405 | */ | |
1406 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) | |
1407 | { | |
1408 | ||
1409 | cmd->error = rc; | |
1410 | cmd->state = UB_CMDST_DONE; | |
1411 | ub_cmdtr_state(sc, cmd); | |
1412 | ub_cmdq_pop(sc); | |
1413 | (*cmd->done)(sc, cmd); | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * Factorization helper for the command state machine: | |
1418 | * Submit a CSW read. | |
1419 | */ | |
1872bceb | 1420 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
1da177e4 LT |
1421 | { |
1422 | int rc; | |
1423 | ||
1424 | UB_INIT_COMPLETION(sc->work_done); | |
1425 | ||
1426 | sc->last_pipe = sc->recv_bulk_pipe; | |
1427 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, | |
1428 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); | |
1429 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1430 | sc->work_urb.actual_length = 0; | |
1431 | sc->work_urb.error_count = 0; | |
1432 | sc->work_urb.status = 0; | |
1433 | ||
1434 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1435 | /* XXX Clear stalls */ | |
1da177e4 LT |
1436 | ub_complete(&sc->work_done); |
1437 | ub_state_done(sc, cmd, rc); | |
1872bceb | 1438 | return -1; |
1da177e4 LT |
1439 | } |
1440 | ||
1441 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; | |
1442 | add_timer(&sc->work_timer); | |
1872bceb | 1443 | return 0; |
1da177e4 LT |
1444 | } |
1445 | ||
1446 | /* | |
1447 | * Factorization helper for the command state machine: | |
1448 | * Submit a CSW read and go to STAT state. | |
1449 | */ | |
1450 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1451 | { | |
1872bceb PZ |
1452 | |
1453 | if (__ub_state_stat(sc, cmd) != 0) | |
1454 | return; | |
1da177e4 LT |
1455 | |
1456 | cmd->stat_count = 0; | |
1457 | cmd->state = UB_CMDST_STAT; | |
1872bceb PZ |
1458 | ub_cmdtr_state(sc, cmd); |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Factorization helper for the command state machine: | |
1463 | * Submit a CSW read and go to STAT state with counter (along [C] path). | |
1464 | */ | |
1465 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1466 | { | |
1467 | ||
1468 | if (++cmd->stat_count >= 4) { | |
1469 | ub_state_sense(sc, cmd); | |
1470 | return; | |
1471 | } | |
1472 | ||
1473 | if (__ub_state_stat(sc, cmd) != 0) | |
1474 | return; | |
1475 | ||
1476 | cmd->state = UB_CMDST_STAT; | |
1da177e4 LT |
1477 | ub_cmdtr_state(sc, cmd); |
1478 | } | |
1479 | ||
1480 | /* | |
1481 | * Factorization helper for the command state machine: | |
1482 | * Submit a REQUEST SENSE and go to SENSE state. | |
1483 | */ | |
1484 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1485 | { | |
1486 | struct ub_scsi_cmd *scmd; | |
1487 | int rc; | |
1488 | ||
1489 | if (cmd->cdb[0] == REQUEST_SENSE) { | |
1490 | rc = -EPIPE; | |
1491 | goto error; | |
1492 | } | |
1493 | ||
1494 | scmd = &sc->top_rqs_cmd; | |
1495 | scmd->cdb[0] = REQUEST_SENSE; | |
1496 | scmd->cdb[4] = UB_SENSE_SIZE; | |
1497 | scmd->cdb_len = 6; | |
1498 | scmd->dir = UB_DIR_READ; | |
1499 | scmd->state = UB_CMDST_INIT; | |
1500 | scmd->data = sc->top_sense; | |
1501 | scmd->len = UB_SENSE_SIZE; | |
f4800078 | 1502 | scmd->lun = cmd->lun; |
1da177e4 LT |
1503 | scmd->done = ub_top_sense_done; |
1504 | scmd->back = cmd; | |
1505 | ||
1506 | scmd->tag = sc->tagcnt++; | |
1507 | ||
1508 | cmd->state = UB_CMDST_SENSE; | |
1509 | ub_cmdtr_state(sc, cmd); | |
1510 | ||
1511 | ub_cmdq_insert(sc, scmd); | |
1512 | return; | |
1513 | ||
1514 | error: | |
1515 | ub_state_done(sc, cmd, rc); | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * A helper for the command's state machine: | |
1520 | * Submit a stall clear. | |
1521 | */ | |
1522 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
1523 | int stalled_pipe) | |
1524 | { | |
1525 | int endp; | |
1526 | struct usb_ctrlrequest *cr; | |
1527 | int rc; | |
1528 | ||
1529 | endp = usb_pipeendpoint(stalled_pipe); | |
1530 | if (usb_pipein (stalled_pipe)) | |
1531 | endp |= USB_DIR_IN; | |
1532 | ||
1533 | cr = &sc->work_cr; | |
1534 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
1535 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
1536 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
1537 | cr->wIndex = cpu_to_le16(endp); | |
1538 | cr->wLength = cpu_to_le16(0); | |
1539 | ||
1540 | UB_INIT_COMPLETION(sc->work_done); | |
1541 | ||
1542 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1543 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); | |
1544 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1545 | sc->work_urb.actual_length = 0; | |
1546 | sc->work_urb.error_count = 0; | |
1547 | sc->work_urb.status = 0; | |
1548 | ||
1549 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1550 | ub_complete(&sc->work_done); | |
1551 | return rc; | |
1552 | } | |
1553 | ||
1554 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1555 | add_timer(&sc->work_timer); | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | */ | |
1561 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) | |
1562 | { | |
1563 | unsigned char *sense = scmd->data; | |
1564 | struct ub_scsi_cmd *cmd; | |
1565 | ||
1566 | /* | |
1567 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. | |
1568 | */ | |
1569 | ub_cmdtr_sense(sc, scmd, sense); | |
1570 | ||
1571 | /* | |
1572 | * Find the command which triggered the unit attention or a check, | |
1573 | * save the sense into it, and advance its state machine. | |
1574 | */ | |
1575 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { | |
1576 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); | |
1577 | return; | |
1578 | } | |
1579 | if (cmd != scmd->back) { | |
1580 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1581 | "sense done for wrong command 0x%x\n", |
1582 | sc->name, cmd->tag); | |
1da177e4 LT |
1583 | return; |
1584 | } | |
1585 | if (cmd->state != UB_CMDST_SENSE) { | |
1586 | printk(KERN_WARNING "%s: " | |
f4800078 PZ |
1587 | "sense done with bad cmd state %d\n", |
1588 | sc->name, cmd->state); | |
1da177e4 LT |
1589 | return; |
1590 | } | |
1591 | ||
1592 | cmd->key = sense[2] & 0x0F; | |
1593 | cmd->asc = sense[12]; | |
1594 | cmd->ascq = sense[13]; | |
1595 | ||
1596 | ub_scsi_urb_compl(sc, cmd); | |
1597 | } | |
1598 | ||
1da177e4 LT |
1599 | /* |
1600 | * This is called from a process context. | |
1601 | */ | |
f4800078 | 1602 | static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) |
1da177e4 LT |
1603 | { |
1604 | ||
f4800078 | 1605 | lun->readonly = 0; /* XXX Query this from the device */ |
1da177e4 | 1606 | |
f4800078 PZ |
1607 | lun->capacity.nsec = 0; |
1608 | lun->capacity.bsize = 512; | |
1609 | lun->capacity.bshift = 0; | |
1da177e4 | 1610 | |
f4800078 | 1611 | if (ub_sync_tur(sc, lun) != 0) |
1da177e4 | 1612 | return; /* Not ready */ |
f4800078 | 1613 | lun->changed = 0; |
1da177e4 | 1614 | |
f4800078 | 1615 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
1da177e4 LT |
1616 | /* |
1617 | * The retry here means something is wrong, either with the | |
1618 | * device, with the transport, or with our code. | |
1619 | * We keep this because sd.c has retries for capacity. | |
1620 | */ | |
f4800078 PZ |
1621 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
1622 | lun->capacity.nsec = 0; | |
1623 | lun->capacity.bsize = 512; | |
1624 | lun->capacity.bshift = 0; | |
1da177e4 LT |
1625 | } |
1626 | } | |
1627 | } | |
1628 | ||
1629 | /* | |
1630 | * The open funcion. | |
1631 | * This is mostly needed to keep refcounting, but also to support | |
1632 | * media checks on removable media drives. | |
1633 | */ | |
1634 | static int ub_bd_open(struct inode *inode, struct file *filp) | |
1635 | { | |
1636 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
f4800078 | 1637 | struct ub_lun *lun; |
1da177e4 LT |
1638 | struct ub_dev *sc; |
1639 | unsigned long flags; | |
1640 | int rc; | |
1641 | ||
f4800078 | 1642 | if ((lun = disk->private_data) == NULL) |
1da177e4 | 1643 | return -ENXIO; |
f4800078 PZ |
1644 | sc = lun->udev; |
1645 | ||
1da177e4 LT |
1646 | spin_lock_irqsave(&ub_lock, flags); |
1647 | if (atomic_read(&sc->poison)) { | |
1648 | spin_unlock_irqrestore(&ub_lock, flags); | |
1649 | return -ENXIO; | |
1650 | } | |
1651 | sc->openc++; | |
1652 | spin_unlock_irqrestore(&ub_lock, flags); | |
1653 | ||
1654 | /* | |
1655 | * This is a workaround for a specific problem in our block layer. | |
1656 | * In 2.6.9, register_disk duplicates the code from rescan_partitions. | |
1657 | * However, if we do add_disk with a device which persistently reports | |
1658 | * a changed media, add_disk calls register_disk, which does do_open, | |
1659 | * which will call rescan_paritions for changed media. After that, | |
1660 | * register_disk attempts to do it all again and causes double kobject | |
1661 | * registration and a eventually an oops on module removal. | |
1662 | * | |
1663 | * The bottom line is, Al Viro says that we should not allow | |
1664 | * bdev->bd_invalidated to be set when doing add_disk no matter what. | |
1665 | */ | |
f4800078 PZ |
1666 | if (lun->first_open) { |
1667 | lun->first_open = 0; | |
1668 | if (lun->changed) { | |
1da177e4 LT |
1669 | rc = -ENOMEDIUM; |
1670 | goto err_open; | |
1671 | } | |
1672 | } | |
1673 | ||
f4800078 | 1674 | if (lun->removable || lun->readonly) |
1da177e4 LT |
1675 | check_disk_change(inode->i_bdev); |
1676 | ||
1677 | /* | |
1678 | * The sd.c considers ->media_present and ->changed not equivalent, | |
1679 | * under some pretty murky conditions (a failure of READ CAPACITY). | |
1680 | * We may need it one day. | |
1681 | */ | |
f4800078 | 1682 | if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) { |
1da177e4 LT |
1683 | rc = -ENOMEDIUM; |
1684 | goto err_open; | |
1685 | } | |
1686 | ||
f4800078 | 1687 | if (lun->readonly && (filp->f_mode & FMODE_WRITE)) { |
1da177e4 LT |
1688 | rc = -EROFS; |
1689 | goto err_open; | |
1690 | } | |
1691 | ||
1692 | return 0; | |
1693 | ||
1694 | err_open: | |
1695 | ub_put(sc); | |
1696 | return rc; | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | */ | |
1701 | static int ub_bd_release(struct inode *inode, struct file *filp) | |
1702 | { | |
1703 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
f4800078 PZ |
1704 | struct ub_lun *lun = disk->private_data; |
1705 | struct ub_dev *sc = lun->udev; | |
1da177e4 LT |
1706 | |
1707 | ub_put(sc); | |
1708 | return 0; | |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * The ioctl interface. | |
1713 | */ | |
1714 | static int ub_bd_ioctl(struct inode *inode, struct file *filp, | |
1715 | unsigned int cmd, unsigned long arg) | |
1716 | { | |
1717 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
1718 | void __user *usermem = (void __user *) arg; | |
1719 | ||
1720 | return scsi_cmd_ioctl(filp, disk, cmd, usermem); | |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * This is called once a new disk was seen by the block layer or by ub_probe(). | |
1725 | * The main onjective here is to discover the features of the media such as | |
1726 | * the capacity, read-only status, etc. USB storage generally does not | |
1727 | * need to be spun up, but if we needed it, this would be the place. | |
1728 | * | |
1729 | * This call can sleep. | |
1730 | * | |
1731 | * The return code is not used. | |
1732 | */ | |
1733 | static int ub_bd_revalidate(struct gendisk *disk) | |
1734 | { | |
f4800078 PZ |
1735 | struct ub_lun *lun = disk->private_data; |
1736 | ||
1737 | ub_revalidate(lun->udev, lun); | |
1da177e4 LT |
1738 | |
1739 | /* XXX Support sector size switching like in sr.c */ | |
f4800078 PZ |
1740 | blk_queue_hardsect_size(disk->queue, lun->capacity.bsize); |
1741 | set_capacity(disk, lun->capacity.nsec); | |
1742 | // set_disk_ro(sdkp->disk, lun->readonly); | |
1da177e4 LT |
1743 | |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * The check is called by the block layer to verify if the media | |
1749 | * is still available. It is supposed to be harmless, lightweight and | |
1750 | * non-intrusive in case the media was not changed. | |
1751 | * | |
1752 | * This call can sleep. | |
1753 | * | |
1754 | * The return code is bool! | |
1755 | */ | |
1756 | static int ub_bd_media_changed(struct gendisk *disk) | |
1757 | { | |
f4800078 | 1758 | struct ub_lun *lun = disk->private_data; |
1da177e4 | 1759 | |
f4800078 | 1760 | if (!lun->removable) |
1da177e4 LT |
1761 | return 0; |
1762 | ||
1763 | /* | |
1764 | * We clean checks always after every command, so this is not | |
1765 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, | |
1766 | * the device is actually not ready with operator or software | |
1767 | * intervention required. One dangerous item might be a drive which | |
1768 | * spins itself down, and come the time to write dirty pages, this | |
1769 | * will fail, then block layer discards the data. Since we never | |
1770 | * spin drives up, such devices simply cannot be used with ub anyway. | |
1771 | */ | |
f4800078 PZ |
1772 | if (ub_sync_tur(lun->udev, lun) != 0) { |
1773 | lun->changed = 1; | |
1da177e4 LT |
1774 | return 1; |
1775 | } | |
1776 | ||
f4800078 | 1777 | return lun->changed; |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | static struct block_device_operations ub_bd_fops = { | |
1781 | .owner = THIS_MODULE, | |
1782 | .open = ub_bd_open, | |
1783 | .release = ub_bd_release, | |
1784 | .ioctl = ub_bd_ioctl, | |
1785 | .media_changed = ub_bd_media_changed, | |
1786 | .revalidate_disk = ub_bd_revalidate, | |
1787 | }; | |
1788 | ||
1789 | /* | |
1790 | * Common ->done routine for commands executed synchronously. | |
1791 | */ | |
1792 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1793 | { | |
1794 | struct completion *cop = cmd->back; | |
1795 | complete(cop); | |
1796 | } | |
1797 | ||
1798 | /* | |
1799 | * Test if the device has a check condition on it, synchronously. | |
1800 | */ | |
f4800078 | 1801 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) |
1da177e4 LT |
1802 | { |
1803 | struct ub_scsi_cmd *cmd; | |
1804 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; | |
1805 | unsigned long flags; | |
1806 | struct completion compl; | |
1807 | int rc; | |
1808 | ||
1809 | init_completion(&compl); | |
1810 | ||
1811 | rc = -ENOMEM; | |
1812 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1813 | goto err_alloc; | |
1814 | memset(cmd, 0, ALLOC_SIZE); | |
1815 | ||
1816 | cmd->cdb[0] = TEST_UNIT_READY; | |
1817 | cmd->cdb_len = 6; | |
1818 | cmd->dir = UB_DIR_NONE; | |
1819 | cmd->state = UB_CMDST_INIT; | |
f4800078 | 1820 | cmd->lun = lun; /* This may be NULL, but that's ok */ |
1da177e4 LT |
1821 | cmd->done = ub_probe_done; |
1822 | cmd->back = &compl; | |
1823 | ||
1824 | spin_lock_irqsave(&sc->lock, flags); | |
1825 | cmd->tag = sc->tagcnt++; | |
1826 | ||
1827 | rc = ub_submit_scsi(sc, cmd); | |
1828 | spin_unlock_irqrestore(&sc->lock, flags); | |
1829 | ||
1830 | if (rc != 0) { | |
1831 | printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */ | |
1832 | goto err_submit; | |
1833 | } | |
1834 | ||
1835 | wait_for_completion(&compl); | |
1836 | ||
1837 | rc = cmd->error; | |
1838 | ||
1839 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ | |
1840 | rc = cmd->key; | |
1841 | ||
1842 | err_submit: | |
1843 | kfree(cmd); | |
1844 | err_alloc: | |
1845 | return rc; | |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * Read the SCSI capacity synchronously (for probing). | |
1850 | */ | |
f4800078 PZ |
1851 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
1852 | struct ub_capacity *ret) | |
1da177e4 LT |
1853 | { |
1854 | struct ub_scsi_cmd *cmd; | |
1855 | char *p; | |
1856 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; | |
1857 | unsigned long flags; | |
1858 | unsigned int bsize, shift; | |
1859 | unsigned long nsec; | |
1860 | struct completion compl; | |
1861 | int rc; | |
1862 | ||
1863 | init_completion(&compl); | |
1864 | ||
1865 | rc = -ENOMEM; | |
1866 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1867 | goto err_alloc; | |
1868 | memset(cmd, 0, ALLOC_SIZE); | |
1869 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); | |
1870 | ||
1871 | cmd->cdb[0] = 0x25; | |
1872 | cmd->cdb_len = 10; | |
1873 | cmd->dir = UB_DIR_READ; | |
1874 | cmd->state = UB_CMDST_INIT; | |
1875 | cmd->data = p; | |
1876 | cmd->len = 8; | |
f4800078 | 1877 | cmd->lun = lun; |
1da177e4 LT |
1878 | cmd->done = ub_probe_done; |
1879 | cmd->back = &compl; | |
1880 | ||
1881 | spin_lock_irqsave(&sc->lock, flags); | |
1882 | cmd->tag = sc->tagcnt++; | |
1883 | ||
1884 | rc = ub_submit_scsi(sc, cmd); | |
1885 | spin_unlock_irqrestore(&sc->lock, flags); | |
1886 | ||
1887 | if (rc != 0) { | |
1888 | printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */ | |
1889 | goto err_submit; | |
1890 | } | |
1891 | ||
1892 | wait_for_completion(&compl); | |
1893 | ||
1894 | if (cmd->error != 0) { | |
1895 | printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */ | |
1896 | rc = -EIO; | |
1897 | goto err_read; | |
1898 | } | |
1899 | if (cmd->act_len != 8) { | |
1900 | printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */ | |
1901 | rc = -EIO; | |
1902 | goto err_read; | |
1903 | } | |
1904 | ||
1905 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ | |
1906 | nsec = be32_to_cpu(*(__be32 *)p) + 1; | |
1907 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); | |
1908 | switch (bsize) { | |
1909 | case 512: shift = 0; break; | |
1910 | case 1024: shift = 1; break; | |
1911 | case 2048: shift = 2; break; | |
1912 | case 4096: shift = 3; break; | |
1913 | default: | |
1914 | printk("ub: Bad sector size %u\n", bsize); /* P3 */ | |
1915 | rc = -EDOM; | |
1916 | goto err_inv_bsize; | |
1917 | } | |
1918 | ||
1919 | ret->bsize = bsize; | |
1920 | ret->bshift = shift; | |
1921 | ret->nsec = nsec << shift; | |
1922 | rc = 0; | |
1923 | ||
1924 | err_inv_bsize: | |
1925 | err_read: | |
1926 | err_submit: | |
1927 | kfree(cmd); | |
1928 | err_alloc: | |
1929 | return rc; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | */ | |
1934 | static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt) | |
1935 | { | |
1936 | struct completion *cop = urb->context; | |
1937 | complete(cop); | |
1938 | } | |
1939 | ||
1940 | static void ub_probe_timeout(unsigned long arg) | |
1941 | { | |
1942 | struct completion *cop = (struct completion *) arg; | |
1943 | complete(cop); | |
1944 | } | |
1945 | ||
f4800078 PZ |
1946 | /* |
1947 | * Get number of LUNs by the way of Bulk GetMaxLUN command. | |
1948 | */ | |
1949 | static int ub_sync_getmaxlun(struct ub_dev *sc) | |
1950 | { | |
1951 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; | |
1952 | unsigned char *p; | |
1953 | enum { ALLOC_SIZE = 1 }; | |
1954 | struct usb_ctrlrequest *cr; | |
1955 | struct completion compl; | |
1956 | struct timer_list timer; | |
1957 | int nluns; | |
1958 | int rc; | |
1959 | ||
1960 | init_completion(&compl); | |
1961 | ||
1962 | rc = -ENOMEM; | |
1963 | if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1964 | goto err_alloc; | |
1965 | *p = 55; | |
1966 | ||
1967 | cr = &sc->work_cr; | |
1968 | cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; | |
1969 | cr->bRequest = US_BULK_GET_MAX_LUN; | |
1970 | cr->wValue = cpu_to_le16(0); | |
1971 | cr->wIndex = cpu_to_le16(ifnum); | |
1972 | cr->wLength = cpu_to_le16(1); | |
1973 | ||
1974 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, | |
1975 | (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); | |
1976 | sc->work_urb.transfer_flags = 0; | |
1977 | sc->work_urb.actual_length = 0; | |
1978 | sc->work_urb.error_count = 0; | |
1979 | sc->work_urb.status = 0; | |
1980 | ||
1981 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
1982 | if (rc == -EPIPE) { | |
1983 | printk("%s: Stall at GetMaxLUN, using 1 LUN\n", | |
1984 | sc->name); /* P3 */ | |
1985 | } else { | |
1986 | printk(KERN_WARNING | |
1987 | "%s: Unable to submit GetMaxLUN (%d)\n", | |
1988 | sc->name, rc); | |
1989 | } | |
1990 | goto err_submit; | |
1991 | } | |
1992 | ||
1993 | init_timer(&timer); | |
1994 | timer.function = ub_probe_timeout; | |
1995 | timer.data = (unsigned long) &compl; | |
1996 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1997 | add_timer(&timer); | |
1998 | ||
1999 | wait_for_completion(&compl); | |
2000 | ||
2001 | del_timer_sync(&timer); | |
2002 | usb_kill_urb(&sc->work_urb); | |
2003 | ||
2004 | if (sc->work_urb.actual_length != 1) { | |
2005 | printk("%s: GetMaxLUN returned %d bytes\n", sc->name, | |
2006 | sc->work_urb.actual_length); /* P3 */ | |
2007 | nluns = 0; | |
2008 | } else { | |
2009 | if ((nluns = *p) == 55) { | |
2010 | nluns = 0; | |
2011 | } else { | |
2012 | /* GetMaxLUN returns the maximum LUN number */ | |
2013 | nluns += 1; | |
2014 | if (nluns > UB_MAX_LUNS) | |
2015 | nluns = UB_MAX_LUNS; | |
2016 | } | |
2017 | printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name, | |
2018 | *p, nluns); /* P3 */ | |
2019 | } | |
2020 | ||
2021 | kfree(p); | |
2022 | return nluns; | |
2023 | ||
2024 | err_submit: | |
2025 | kfree(p); | |
2026 | err_alloc: | |
2027 | return rc; | |
2028 | } | |
2029 | ||
1da177e4 LT |
2030 | /* |
2031 | * Clear initial stalls. | |
2032 | */ | |
2033 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) | |
2034 | { | |
2035 | int endp; | |
2036 | struct usb_ctrlrequest *cr; | |
2037 | struct completion compl; | |
2038 | struct timer_list timer; | |
2039 | int rc; | |
2040 | ||
2041 | init_completion(&compl); | |
2042 | ||
2043 | endp = usb_pipeendpoint(stalled_pipe); | |
2044 | if (usb_pipein (stalled_pipe)) | |
2045 | endp |= USB_DIR_IN; | |
2046 | ||
2047 | cr = &sc->work_cr; | |
2048 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
2049 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
2050 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
2051 | cr->wIndex = cpu_to_le16(endp); | |
2052 | cr->wLength = cpu_to_le16(0); | |
2053 | ||
2054 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
2055 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
2056 | sc->work_urb.transfer_flags = 0; | |
2057 | sc->work_urb.actual_length = 0; | |
2058 | sc->work_urb.error_count = 0; | |
2059 | sc->work_urb.status = 0; | |
2060 | ||
2061 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
2062 | printk(KERN_WARNING | |
2063 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); | |
2064 | return rc; | |
2065 | } | |
2066 | ||
2067 | init_timer(&timer); | |
2068 | timer.function = ub_probe_timeout; | |
2069 | timer.data = (unsigned long) &compl; | |
2070 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
2071 | add_timer(&timer); | |
2072 | ||
2073 | wait_for_completion(&compl); | |
2074 | ||
2075 | del_timer_sync(&timer); | |
2076 | usb_kill_urb(&sc->work_urb); | |
2077 | ||
2078 | /* reset the endpoint toggle */ | |
2079 | usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0); | |
2080 | ||
2081 | return 0; | |
2082 | } | |
2083 | ||
2084 | /* | |
2085 | * Get the pipe settings. | |
2086 | */ | |
2087 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, | |
2088 | struct usb_interface *intf) | |
2089 | { | |
2090 | struct usb_host_interface *altsetting = intf->cur_altsetting; | |
2091 | struct usb_endpoint_descriptor *ep_in = NULL; | |
2092 | struct usb_endpoint_descriptor *ep_out = NULL; | |
2093 | struct usb_endpoint_descriptor *ep; | |
2094 | int i; | |
2095 | ||
2096 | /* | |
2097 | * Find the endpoints we need. | |
2098 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
2099 | * We will ignore any others. | |
2100 | */ | |
2101 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
2102 | ep = &altsetting->endpoint[i].desc; | |
2103 | ||
2104 | /* Is it a BULK endpoint? */ | |
2105 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
2106 | == USB_ENDPOINT_XFER_BULK) { | |
2107 | /* BULK in or out? */ | |
2108 | if (ep->bEndpointAddress & USB_DIR_IN) | |
2109 | ep_in = ep; | |
2110 | else | |
2111 | ep_out = ep; | |
2112 | } | |
2113 | } | |
2114 | ||
2115 | if (ep_in == NULL || ep_out == NULL) { | |
f4800078 PZ |
2116 | printk(KERN_NOTICE "%s: failed endpoint check\n", |
2117 | sc->name); | |
1da177e4 LT |
2118 | return -EIO; |
2119 | } | |
2120 | ||
2121 | /* Calculate and store the pipe values */ | |
2122 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); | |
2123 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); | |
2124 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, | |
2125 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
2126 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, | |
2127 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
2128 | ||
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Probing is done in the process context, which allows us to cheat | |
2134 | * and not to build a state machine for the discovery. | |
2135 | */ | |
2136 | static int ub_probe(struct usb_interface *intf, | |
2137 | const struct usb_device_id *dev_id) | |
2138 | { | |
2139 | struct ub_dev *sc; | |
f4800078 | 2140 | int nluns; |
1da177e4 LT |
2141 | int rc; |
2142 | int i; | |
2143 | ||
2144 | rc = -ENOMEM; | |
2145 | if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) | |
2146 | goto err_core; | |
2147 | memset(sc, 0, sizeof(struct ub_dev)); | |
2148 | spin_lock_init(&sc->lock); | |
f4800078 | 2149 | INIT_LIST_HEAD(&sc->luns); |
1da177e4 LT |
2150 | usb_init_urb(&sc->work_urb); |
2151 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); | |
2152 | atomic_set(&sc->poison, 0); | |
2153 | ||
2154 | init_timer(&sc->work_timer); | |
2155 | sc->work_timer.data = (unsigned long) sc; | |
2156 | sc->work_timer.function = ub_urb_timeout; | |
2157 | ||
2158 | ub_init_completion(&sc->work_done); | |
2159 | sc->work_done.done = 1; /* A little yuk, but oh well... */ | |
2160 | ||
1da177e4 LT |
2161 | sc->dev = interface_to_usbdev(intf); |
2162 | sc->intf = intf; | |
2163 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
1da177e4 LT |
2164 | usb_set_intfdata(intf, sc); |
2165 | usb_get_dev(sc->dev); | |
2166 | // usb_get_intf(sc->intf); /* Do we need this? */ | |
2167 | ||
f4800078 PZ |
2168 | snprintf(sc->name, 12, DRV_NAME "(%d.%d)", |
2169 | sc->dev->bus->busnum, sc->dev->devnum); | |
2170 | ||
1da177e4 LT |
2171 | /* XXX Verify that we can handle the device (from descriptors) */ |
2172 | ||
2173 | ub_get_pipes(sc, sc->dev, intf); | |
2174 | ||
2175 | if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0) | |
2176 | goto err_diag; | |
2177 | ||
2178 | /* | |
2179 | * At this point, all USB initialization is done, do upper layer. | |
2180 | * We really hate halfway initialized structures, so from the | |
2181 | * invariants perspective, this ub_dev is fully constructed at | |
2182 | * this point. | |
2183 | */ | |
2184 | ||
2185 | /* | |
2186 | * This is needed to clear toggles. It is a problem only if we do | |
2187 | * `rmmod ub && modprobe ub` without disconnects, but we like that. | |
2188 | */ | |
2189 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
2190 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
2191 | ||
2192 | /* | |
2193 | * The way this is used by the startup code is a little specific. | |
2194 | * A SCSI check causes a USB stall. Our common case code sees it | |
2195 | * and clears the check, after which the device is ready for use. | |
2196 | * But if a check was not present, any command other than | |
2197 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). | |
2198 | * | |
2199 | * If we neglect to clear the SCSI check, the first real command fails | |
2200 | * (which is the capacity readout). We clear that and retry, but why | |
2201 | * causing spurious retries for no reason. | |
2202 | * | |
2203 | * Revalidation may start with its own TEST_UNIT_READY, but that one | |
2204 | * has to succeed, so we clear checks with an additional one here. | |
2205 | * In any case it's not our business how revaliadation is implemented. | |
2206 | */ | |
2207 | for (i = 0; i < 3; i++) { /* Retries for benh's key */ | |
f4800078 | 2208 | if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; |
1da177e4 LT |
2209 | if (rc != 0x6) break; |
2210 | msleep(10); | |
2211 | } | |
2212 | ||
f4800078 PZ |
2213 | nluns = 1; |
2214 | for (i = 0; i < 3; i++) { | |
2215 | if ((rc = ub_sync_getmaxlun(sc)) < 0) { | |
2216 | /* | |
2217 | * Some devices (i.e. Iomega Zip100) need this -- | |
2218 | * apparently the bulk pipes get STALLed when the | |
2219 | * GetMaxLUN request is processed. | |
2220 | * XXX I have a ZIP-100, verify it does this. | |
2221 | */ | |
2222 | if (rc == -EPIPE) { | |
2223 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
2224 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
2225 | } | |
2226 | break; | |
2227 | } | |
2228 | if (rc != 0) { | |
2229 | nluns = rc; | |
2230 | break; | |
2231 | } | |
9f793d2c | 2232 | msleep(100); |
f4800078 | 2233 | } |
1da177e4 | 2234 | |
f4800078 PZ |
2235 | for (i = 0; i < nluns; i++) { |
2236 | ub_probe_lun(sc, i); | |
2237 | } | |
2238 | return 0; | |
2239 | ||
2240 | /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */ | |
2241 | err_diag: | |
2242 | usb_set_intfdata(intf, NULL); | |
2243 | // usb_put_intf(sc->intf); | |
2244 | usb_put_dev(sc->dev); | |
2245 | kfree(sc); | |
2246 | err_core: | |
2247 | return rc; | |
2248 | } | |
2249 | ||
2250 | static int ub_probe_lun(struct ub_dev *sc, int lnum) | |
2251 | { | |
2252 | struct ub_lun *lun; | |
2253 | request_queue_t *q; | |
2254 | struct gendisk *disk; | |
2255 | int rc; | |
2256 | ||
2257 | rc = -ENOMEM; | |
2258 | if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) | |
2259 | goto err_alloc; | |
2260 | memset(lun, 0, sizeof(struct ub_lun)); | |
2261 | lun->num = lnum; | |
2262 | ||
2263 | rc = -ENOSR; | |
2264 | if ((lun->id = ub_id_get()) == -1) | |
2265 | goto err_id; | |
2266 | ||
2267 | lun->udev = sc; | |
2268 | list_add(&lun->link, &sc->luns); | |
2269 | ||
2270 | snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", | |
2271 | lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); | |
2272 | ||
2273 | lun->removable = 1; /* XXX Query this from the device */ | |
2274 | lun->changed = 1; /* ub_revalidate clears only */ | |
2275 | lun->first_open = 1; | |
2276 | ub_revalidate(sc, lun); | |
1da177e4 | 2277 | |
1da177e4 LT |
2278 | rc = -ENOMEM; |
2279 | if ((disk = alloc_disk(UB_MINORS_PER_MAJOR)) == NULL) | |
2280 | goto err_diskalloc; | |
2281 | ||
f4800078 PZ |
2282 | lun->disk = disk; |
2283 | sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); | |
2284 | sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a'); | |
1da177e4 | 2285 | disk->major = UB_MAJOR; |
f4800078 | 2286 | disk->first_minor = lun->id * UB_MINORS_PER_MAJOR; |
1da177e4 | 2287 | disk->fops = &ub_bd_fops; |
f4800078 PZ |
2288 | disk->private_data = lun; |
2289 | disk->driverfs_dev = &sc->intf->dev; /* XXX Many to one ok? */ | |
1da177e4 LT |
2290 | |
2291 | rc = -ENOMEM; | |
2292 | if ((q = blk_init_queue(ub_bd_rq_fn, &sc->lock)) == NULL) | |
2293 | goto err_blkqinit; | |
2294 | ||
2295 | disk->queue = q; | |
2296 | ||
f4800078 | 2297 | blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); |
1da177e4 LT |
2298 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); |
2299 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); | |
f4800078 | 2300 | blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ |
1da177e4 | 2301 | blk_queue_max_sectors(q, UB_MAX_SECTORS); |
f4800078 | 2302 | blk_queue_hardsect_size(q, lun->capacity.bsize); |
1da177e4 | 2303 | |
f4800078 | 2304 | q->queuedata = lun; |
1da177e4 | 2305 | |
f4800078 PZ |
2306 | set_capacity(disk, lun->capacity.nsec); |
2307 | if (lun->removable) | |
1da177e4 LT |
2308 | disk->flags |= GENHD_FL_REMOVABLE; |
2309 | ||
2310 | add_disk(disk); | |
2311 | ||
2312 | return 0; | |
2313 | ||
2314 | err_blkqinit: | |
2315 | put_disk(disk); | |
2316 | err_diskalloc: | |
f4800078 PZ |
2317 | list_del(&lun->link); |
2318 | ub_id_put(lun->id); | |
1da177e4 | 2319 | err_id: |
f4800078 PZ |
2320 | kfree(lun); |
2321 | err_alloc: | |
1da177e4 LT |
2322 | return rc; |
2323 | } | |
2324 | ||
2325 | static void ub_disconnect(struct usb_interface *intf) | |
2326 | { | |
2327 | struct ub_dev *sc = usb_get_intfdata(intf); | |
f4800078 PZ |
2328 | struct list_head *p; |
2329 | struct ub_lun *lun; | |
2330 | struct gendisk *disk; | |
1da177e4 LT |
2331 | unsigned long flags; |
2332 | ||
2333 | /* | |
2334 | * Prevent ub_bd_release from pulling the rug from under us. | |
2335 | * XXX This is starting to look like a kref. | |
2336 | * XXX Why not to take this ref at probe time? | |
2337 | */ | |
2338 | spin_lock_irqsave(&ub_lock, flags); | |
2339 | sc->openc++; | |
2340 | spin_unlock_irqrestore(&ub_lock, flags); | |
2341 | ||
2342 | /* | |
2343 | * Fence stall clearnings, operations triggered by unlinkings and so on. | |
2344 | * We do not attempt to unlink any URBs, because we do not trust the | |
2345 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. | |
2346 | */ | |
2347 | atomic_set(&sc->poison, 1); | |
2348 | ||
2349 | /* | |
2350 | * Blow away queued commands. | |
2351 | * | |
2352 | * Actually, this never works, because before we get here | |
2353 | * the HCD terminates outstanding URB(s). It causes our | |
2354 | * SCSI command queue to advance, commands fail to submit, | |
2355 | * and the whole queue drains. So, we just use this code to | |
2356 | * print warnings. | |
2357 | */ | |
2358 | spin_lock_irqsave(&sc->lock, flags); | |
2359 | { | |
2360 | struct ub_scsi_cmd *cmd; | |
2361 | int cnt = 0; | |
2362 | while ((cmd = ub_cmdq_pop(sc)) != NULL) { | |
2363 | cmd->error = -ENOTCONN; | |
2364 | cmd->state = UB_CMDST_DONE; | |
2365 | ub_cmdtr_state(sc, cmd); | |
2366 | ub_cmdq_pop(sc); | |
2367 | (*cmd->done)(sc, cmd); | |
2368 | cnt++; | |
2369 | } | |
2370 | if (cnt != 0) { | |
2371 | printk(KERN_WARNING "%s: " | |
2372 | "%d was queued after shutdown\n", sc->name, cnt); | |
2373 | } | |
2374 | } | |
2375 | spin_unlock_irqrestore(&sc->lock, flags); | |
2376 | ||
2377 | /* | |
2378 | * Unregister the upper layer. | |
2379 | */ | |
f4800078 PZ |
2380 | list_for_each (p, &sc->luns) { |
2381 | lun = list_entry(p, struct ub_lun, link); | |
2382 | disk = lun->disk; | |
2383 | if (disk->flags & GENHD_FL_UP) | |
2384 | del_gendisk(disk); | |
2385 | /* | |
2386 | * I wish I could do: | |
2387 | * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); | |
2388 | * As it is, we rely on our internal poisoning and let | |
2389 | * the upper levels to spin furiously failing all the I/O. | |
2390 | */ | |
2391 | } | |
1da177e4 LT |
2392 | |
2393 | /* | |
2394 | * Taking a lock on a structure which is about to be freed | |
2395 | * is very nonsensual. Here it is largely a way to do a debug freeze, | |
2396 | * and a bracket which shows where the nonsensual code segment ends. | |
2397 | * | |
2398 | * Testing for -EINPROGRESS is always a bug, so we are bending | |
2399 | * the rules a little. | |
2400 | */ | |
2401 | spin_lock_irqsave(&sc->lock, flags); | |
2402 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ | |
2403 | printk(KERN_WARNING "%s: " | |
2404 | "URB is active after disconnect\n", sc->name); | |
2405 | } | |
2406 | spin_unlock_irqrestore(&sc->lock, flags); | |
2407 | ||
2408 | /* | |
2409 | * There is virtually no chance that other CPU runs times so long | |
2410 | * after ub_urb_complete should have called del_timer, but only if HCD | |
2411 | * didn't forget to deliver a callback on unlink. | |
2412 | */ | |
2413 | del_timer_sync(&sc->work_timer); | |
2414 | ||
2415 | /* | |
2416 | * At this point there must be no commands coming from anyone | |
2417 | * and no URBs left in transit. | |
2418 | */ | |
2419 | ||
2420 | device_remove_file(&sc->intf->dev, &dev_attr_diag); | |
2421 | usb_set_intfdata(intf, NULL); | |
2422 | // usb_put_intf(sc->intf); | |
2423 | sc->intf = NULL; | |
2424 | usb_put_dev(sc->dev); | |
2425 | sc->dev = NULL; | |
2426 | ||
2427 | ub_put(sc); | |
2428 | } | |
2429 | ||
2430 | static struct usb_driver ub_driver = { | |
2431 | .owner = THIS_MODULE, | |
2432 | .name = "ub", | |
2433 | .probe = ub_probe, | |
2434 | .disconnect = ub_disconnect, | |
2435 | .id_table = ub_usb_ids, | |
2436 | }; | |
2437 | ||
2438 | static int __init ub_init(void) | |
2439 | { | |
2440 | int rc; | |
2441 | ||
f4800078 PZ |
2442 | /* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu ub_lun %zu\n", |
2443 | sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev), sizeof(struct ub_lun)); | |
1da177e4 LT |
2444 | |
2445 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) | |
2446 | goto err_regblkdev; | |
2447 | devfs_mk_dir(DEVFS_NAME); | |
2448 | ||
2449 | if ((rc = usb_register(&ub_driver)) != 0) | |
2450 | goto err_register; | |
2451 | ||
2452 | return 0; | |
2453 | ||
2454 | err_register: | |
2455 | devfs_remove(DEVFS_NAME); | |
2456 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2457 | err_regblkdev: | |
2458 | return rc; | |
2459 | } | |
2460 | ||
2461 | static void __exit ub_exit(void) | |
2462 | { | |
2463 | usb_deregister(&ub_driver); | |
2464 | ||
2465 | devfs_remove(DEVFS_NAME); | |
2466 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2467 | } | |
2468 | ||
2469 | module_init(ub_init); | |
2470 | module_exit(ub_exit); | |
2471 | ||
2472 | MODULE_LICENSE("GPL"); |