Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 11 | * -- Kill first_open (Al Viro fixed the block layer now) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries |
| 15 | * -- verify the 13 conditions and do bulk resets |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * -- kill last_pipe and simply do two-state clearing on both pipes |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 17 | * -- highmem |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * -- move top_sense and work_bcs into separate allocations (if they survive) |
| 19 | * for cache purists and esoteric architectures. |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 20 | * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * -- prune comments, they are too volumnous |
| 22 | * -- Exterminate P3 printks |
| 23 | * -- Resove XXX's |
| 24 | * -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=? |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 25 | * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | */ |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/usb.h> |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 30 | #include <linux/usb_usual.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 41 | /* |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 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 | |
| 108 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 109 | * This many LUNs per USB device. |
| 110 | * Every one of them takes a host, see UB_MAX_HOSTS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | */ |
Pete Zaitcev | 9f793d2 | 2005-06-06 13:54:59 -0700 | [diff] [blame] | 112 | #define UB_MAX_LUNS 9 |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | */ |
| 116 | |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 117 | #define UB_PARTS_PER_LUN 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ |
| 120 | |
| 121 | #define UB_SENSE_SIZE 18 |
| 122 | |
| 123 | /* |
| 124 | */ |
| 125 | |
| 126 | /* command block wrapper */ |
| 127 | struct bulk_cb_wrap { |
| 128 | __le32 Signature; /* contains 'USBC' */ |
| 129 | u32 Tag; /* unique per command id */ |
| 130 | __le32 DataTransferLength; /* size of data */ |
| 131 | u8 Flags; /* direction in bit 0 */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 132 | u8 Lun; /* LUN */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | u8 Length; /* of of the CDB */ |
| 134 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ |
| 135 | }; |
| 136 | |
| 137 | #define US_BULK_CB_WRAP_LEN 31 |
| 138 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ |
| 139 | #define US_BULK_FLAG_IN 1 |
| 140 | #define US_BULK_FLAG_OUT 0 |
| 141 | |
| 142 | /* command status wrapper */ |
| 143 | struct bulk_cs_wrap { |
| 144 | __le32 Signature; /* should = 'USBS' */ |
| 145 | u32 Tag; /* same as original command */ |
| 146 | __le32 Residue; /* amount not transferred */ |
| 147 | u8 Status; /* see below */ |
| 148 | }; |
| 149 | |
| 150 | #define US_BULK_CS_WRAP_LEN 13 |
| 151 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | #define US_BULK_STAT_OK 0 |
| 153 | #define US_BULK_STAT_FAIL 1 |
| 154 | #define US_BULK_STAT_PHASE 2 |
| 155 | |
| 156 | /* bulk-only class specific requests */ |
| 157 | #define US_BULK_RESET_REQUEST 0xff |
| 158 | #define US_BULK_GET_MAX_LUN 0xfe |
| 159 | |
| 160 | /* |
| 161 | */ |
| 162 | struct ub_dev; |
| 163 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 164 | #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | #define UB_MAX_SECTORS 64 |
| 166 | |
| 167 | /* |
| 168 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) |
| 169 | * even if a webcam hogs the bus, but some devices need time to spin up. |
| 170 | */ |
| 171 | #define UB_URB_TIMEOUT (HZ*2) |
| 172 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ |
| 173 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ |
| 174 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ |
| 175 | |
| 176 | /* |
| 177 | * An instance of a SCSI command in transit. |
| 178 | */ |
| 179 | #define UB_DIR_NONE 0 |
| 180 | #define UB_DIR_READ 1 |
| 181 | #define UB_DIR_ILLEGAL2 2 |
| 182 | #define UB_DIR_WRITE 3 |
| 183 | |
| 184 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ |
| 185 | (((c)==UB_DIR_READ)? 'r': 'n')) |
| 186 | |
| 187 | enum ub_scsi_cmd_state { |
| 188 | UB_CMDST_INIT, /* Initial state */ |
| 189 | UB_CMDST_CMD, /* Command submitted */ |
| 190 | UB_CMDST_DATA, /* Data phase */ |
| 191 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ |
| 192 | UB_CMDST_STAT, /* Status phase */ |
| 193 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 194 | UB_CMDST_CLRRS, /* Clearing before retrying status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | UB_CMDST_SENSE, /* Sending Request Sense */ |
| 196 | UB_CMDST_DONE /* Final state */ |
| 197 | }; |
| 198 | |
| 199 | static char *ub_scsi_cmd_stname[] = { |
| 200 | ". ", |
| 201 | "Cmd", |
| 202 | "dat", |
| 203 | "c2s", |
| 204 | "sts", |
| 205 | "clr", |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 206 | "crs", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | "Sen", |
| 208 | "fin" |
| 209 | }; |
| 210 | |
| 211 | struct ub_scsi_cmd { |
| 212 | unsigned char cdb[UB_MAX_CDB_SIZE]; |
| 213 | unsigned char cdb_len; |
| 214 | |
| 215 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ |
| 216 | unsigned char trace_index; |
| 217 | enum ub_scsi_cmd_state state; |
| 218 | unsigned int tag; |
| 219 | struct ub_scsi_cmd *next; |
| 220 | |
| 221 | int error; /* Return code - valid upon done */ |
| 222 | unsigned int act_len; /* Return size */ |
| 223 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ |
| 224 | |
| 225 | int stat_count; /* Retries getting status. */ |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | unsigned int len; /* Requested length */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 228 | unsigned int current_sg; |
| 229 | unsigned int nsg; /* sgv[nsg] */ |
| 230 | struct scatterlist sgv[UB_MAX_REQ_SG]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 232 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); |
| 234 | void *back; |
| 235 | }; |
| 236 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 237 | struct ub_request { |
| 238 | struct request *rq; |
| 239 | unsigned int current_try; |
| 240 | unsigned int nsg; /* sgv[nsg] */ |
| 241 | struct scatterlist sgv[UB_MAX_REQ_SG]; |
| 242 | }; |
| 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | /* |
| 245 | */ |
| 246 | struct ub_capacity { |
| 247 | unsigned long nsec; /* Linux size - 512 byte sectors */ |
| 248 | unsigned int bsize; /* Linux hardsect_size */ |
| 249 | unsigned int bshift; /* Shift between 512 and hard sects */ |
| 250 | }; |
| 251 | |
| 252 | /* |
| 253 | * The SCSI command tracing structure. |
| 254 | */ |
| 255 | |
| 256 | #define SCMD_ST_HIST_SZ 8 |
| 257 | #define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */ |
| 258 | |
| 259 | struct ub_scsi_cmd_trace { |
| 260 | int hcur; |
| 261 | unsigned int tag; |
| 262 | unsigned int req_size, act_size; |
| 263 | unsigned char op; |
| 264 | unsigned char dir; |
| 265 | unsigned char key, asc, ascq; |
| 266 | char st_hst[SCMD_ST_HIST_SZ]; |
| 267 | }; |
| 268 | |
| 269 | struct ub_scsi_trace { |
| 270 | int cur; |
| 271 | struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ]; |
| 272 | }; |
| 273 | |
| 274 | /* |
| 275 | * This is a direct take-off from linux/include/completion.h |
| 276 | * The difference is that I do not wait on this thing, just poll. |
| 277 | * When I want to wait (ub_probe), I just use the stock completion. |
| 278 | * |
| 279 | * Note that INIT_COMPLETION takes no lock. It is correct. But why |
| 280 | * in the bloody hell that thing takes struct instead of pointer to struct |
| 281 | * is quite beyond me. I just copied it from the stock completion. |
| 282 | */ |
| 283 | struct ub_completion { |
| 284 | unsigned int done; |
| 285 | spinlock_t lock; |
| 286 | }; |
| 287 | |
| 288 | static inline void ub_init_completion(struct ub_completion *x) |
| 289 | { |
| 290 | x->done = 0; |
| 291 | spin_lock_init(&x->lock); |
| 292 | } |
| 293 | |
| 294 | #define UB_INIT_COMPLETION(x) ((x).done = 0) |
| 295 | |
| 296 | static void ub_complete(struct ub_completion *x) |
| 297 | { |
| 298 | unsigned long flags; |
| 299 | |
| 300 | spin_lock_irqsave(&x->lock, flags); |
| 301 | x->done++; |
| 302 | spin_unlock_irqrestore(&x->lock, flags); |
| 303 | } |
| 304 | |
| 305 | static int ub_is_completed(struct ub_completion *x) |
| 306 | { |
| 307 | unsigned long flags; |
| 308 | int ret; |
| 309 | |
| 310 | spin_lock_irqsave(&x->lock, flags); |
| 311 | ret = x->done; |
| 312 | spin_unlock_irqrestore(&x->lock, flags); |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | */ |
| 318 | struct ub_scsi_cmd_queue { |
| 319 | int qlen, qmax; |
| 320 | struct ub_scsi_cmd *head, *tail; |
| 321 | }; |
| 322 | |
| 323 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 324 | * The block device instance (one per LUN). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 326 | struct ub_lun { |
| 327 | struct ub_dev *udev; |
| 328 | struct list_head link; |
| 329 | struct gendisk *disk; |
| 330 | int id; /* Host index */ |
| 331 | int num; /* LUN number */ |
| 332 | char name[16]; |
| 333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | int changed; /* Media was changed */ |
| 335 | int removable; |
| 336 | int readonly; |
| 337 | int first_open; /* Kludge. See ub_bd_open. */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 338 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 339 | struct ub_request urq; |
| 340 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 341 | /* Use Ingo's mempool if or when we have more than one command. */ |
| 342 | /* |
| 343 | * Currently we never need more than one command for the whole device. |
| 344 | * However, giving every LUN a command is a cheap and automatic way |
| 345 | * to enforce fairness between them. |
| 346 | */ |
| 347 | int cmda[1]; |
| 348 | struct ub_scsi_cmd cmdv[1]; |
| 349 | |
| 350 | struct ub_capacity capacity; |
| 351 | }; |
| 352 | |
| 353 | /* |
| 354 | * The USB device instance. |
| 355 | */ |
| 356 | struct ub_dev { |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 357 | spinlock_t *lock; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 358 | atomic_t poison; /* The USB device is disconnected */ |
| 359 | int openc; /* protected by ub_lock! */ |
| 360 | /* kref is too implicit for our taste */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 361 | int reset; /* Reset is running */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 362 | unsigned int tagcnt; |
| 363 | char name[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | struct usb_device *dev; |
| 365 | struct usb_interface *intf; |
| 366 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 367 | struct list_head luns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | unsigned int send_bulk_pipe; /* cached pipe values */ |
| 370 | unsigned int recv_bulk_pipe; |
| 371 | unsigned int send_ctrl_pipe; |
| 372 | unsigned int recv_ctrl_pipe; |
| 373 | |
| 374 | struct tasklet_struct tasklet; |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | struct ub_scsi_cmd_queue cmd_queue; |
| 377 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ |
| 378 | unsigned char top_sense[UB_SENSE_SIZE]; |
| 379 | |
| 380 | struct ub_completion work_done; |
| 381 | struct urb work_urb; |
| 382 | struct timer_list work_timer; |
| 383 | int last_pipe; /* What might need clearing */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 384 | __le32 signature; /* Learned signature */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | struct bulk_cb_wrap work_bcb; |
| 386 | struct bulk_cs_wrap work_bcs; |
| 387 | struct usb_ctrlrequest work_cr; |
| 388 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 389 | struct work_struct reset_work; |
| 390 | wait_queue_head_t reset_wait; |
| 391 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 392 | int sg_stat[6]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | struct ub_scsi_trace tr; |
| 394 | }; |
| 395 | |
| 396 | /* |
| 397 | */ |
| 398 | static void ub_cleanup(struct ub_dev *sc); |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 399 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 400 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
| 401 | struct ub_scsi_cmd *cmd, struct ub_request *urq); |
| 402 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, |
| 403 | struct ub_scsi_cmd *cmd, struct ub_request *urq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
| 405 | static void ub_end_rq(struct request *rq, int uptodate); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 406 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
| 407 | struct ub_request *urq, struct ub_scsi_cmd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
| 409 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt); |
| 410 | static void ub_scsi_action(unsigned long _dev); |
| 411 | static void ub_scsi_dispatch(struct ub_dev *sc); |
| 412 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 413 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 415 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 417 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
| 419 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
| 420 | int stalled_pipe); |
| 421 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 422 | static void ub_reset_enter(struct ub_dev *sc, int try); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 423 | static void ub_reset_task(void *arg); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 424 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); |
| 425 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
| 426 | struct ub_capacity *ret); |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 427 | static int ub_sync_reset(struct ub_dev *sc); |
| 428 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 429 | static int ub_probe_lun(struct ub_dev *sc, int lnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | /* |
| 432 | */ |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 433 | #ifdef CONFIG_USB_LIBUSUAL |
| 434 | |
| 435 | #define ub_usb_ids storage_usb_ids |
| 436 | #else |
| 437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | static struct usb_device_id ub_usb_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, |
| 440 | { } |
| 441 | }; |
| 442 | |
| 443 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 444 | #endif /* CONFIG_USB_LIBUSUAL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | /* |
| 447 | * Find me a way to identify "next free minor" for add_disk(), |
| 448 | * and the array disappears the next day. However, the number of |
| 449 | * hosts has something to do with the naming and /proc/partitions. |
| 450 | * This has to be thought out in detail before changing. |
| 451 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. |
| 452 | */ |
| 453 | #define UB_MAX_HOSTS 26 |
| 454 | static char ub_hostv[UB_MAX_HOSTS]; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 455 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 456 | #define UB_QLOCK_NUM 5 |
| 457 | static spinlock_t ub_qlockv[UB_QLOCK_NUM]; |
| 458 | static int ub_qlock_next = 0; |
| 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ |
| 461 | |
| 462 | /* |
| 463 | * The SCSI command tracing procedures. |
| 464 | */ |
| 465 | |
| 466 | static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 467 | { |
| 468 | int n; |
| 469 | struct ub_scsi_cmd_trace *t; |
| 470 | |
| 471 | if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0; |
| 472 | t = &sc->tr.vec[n]; |
| 473 | |
| 474 | memset(t, 0, sizeof(struct ub_scsi_cmd_trace)); |
| 475 | t->tag = cmd->tag; |
| 476 | t->op = cmd->cdb[0]; |
| 477 | t->dir = cmd->dir; |
| 478 | t->req_size = cmd->len; |
| 479 | t->st_hst[0] = cmd->state; |
| 480 | |
| 481 | sc->tr.cur = n; |
| 482 | cmd->trace_index = n; |
| 483 | } |
| 484 | |
| 485 | static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 486 | { |
| 487 | int n; |
| 488 | struct ub_scsi_cmd_trace *t; |
| 489 | |
| 490 | t = &sc->tr.vec[cmd->trace_index]; |
| 491 | if (t->tag == cmd->tag) { |
| 492 | if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0; |
| 493 | t->st_hst[n] = cmd->state; |
| 494 | t->hcur = n; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 499 | { |
| 500 | struct ub_scsi_cmd_trace *t; |
| 501 | |
| 502 | t = &sc->tr.vec[cmd->trace_index]; |
| 503 | if (t->tag == cmd->tag) |
| 504 | t->act_size = cmd->act_len; |
| 505 | } |
| 506 | |
| 507 | static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
| 508 | unsigned char *sense) |
| 509 | { |
| 510 | struct ub_scsi_cmd_trace *t; |
| 511 | |
| 512 | t = &sc->tr.vec[cmd->trace_index]; |
| 513 | if (t->tag == cmd->tag) { |
| 514 | t->key = sense[2] & 0x0F; |
| 515 | t->asc = sense[12]; |
| 516 | t->ascq = sense[13]; |
| 517 | } |
| 518 | } |
| 519 | |
Pete Zaitcev | 07d4fd2 | 2005-07-30 22:51:45 -0700 | [diff] [blame] | 520 | static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr, |
| 521 | char *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
| 523 | struct usb_interface *intf; |
| 524 | struct ub_dev *sc; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 525 | struct list_head *p; |
| 526 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | int cnt; |
| 528 | unsigned long flags; |
| 529 | int nc, nh; |
| 530 | int i, j; |
| 531 | struct ub_scsi_cmd_trace *t; |
| 532 | |
| 533 | intf = to_usb_interface(dev); |
| 534 | sc = usb_get_intfdata(intf); |
| 535 | if (sc == NULL) |
| 536 | return 0; |
| 537 | |
| 538 | cnt = 0; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 539 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | cnt += sprintf(page + cnt, |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 542 | "poison %d reset %d\n", |
| 543 | atomic_read(&sc->poison), sc->reset); |
| 544 | cnt += sprintf(page + cnt, |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 545 | "qlen %d qmax %d\n", |
| 546 | sc->cmd_queue.qlen, sc->cmd_queue.qmax); |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 547 | cnt += sprintf(page + cnt, |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 548 | "sg %d %d %d %d %d .. %d\n", |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 549 | sc->sg_stat[0], |
| 550 | sc->sg_stat[1], |
| 551 | sc->sg_stat[2], |
| 552 | sc->sg_stat[3], |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 553 | sc->sg_stat[4], |
| 554 | sc->sg_stat[5]); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 555 | |
| 556 | list_for_each (p, &sc->luns) { |
| 557 | lun = list_entry(p, struct ub_lun, link); |
| 558 | cnt += sprintf(page + cnt, |
| 559 | "lun %u changed %d removable %d readonly %d\n", |
| 560 | lun->num, lun->changed, lun->removable, lun->readonly); |
| 561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0; |
| 564 | for (j = 0; j < SCMD_TRACE_SZ; j++) { |
| 565 | t = &sc->tr.vec[nc]; |
| 566 | |
| 567 | cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op); |
| 568 | if (t->op == REQUEST_SENSE) { |
| 569 | cnt += sprintf(page + cnt, " [sense %x %02x %02x]", |
| 570 | t->key, t->asc, t->ascq); |
| 571 | } else { |
| 572 | cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir)); |
| 573 | cnt += sprintf(page + cnt, " [%5d %5d]", |
| 574 | t->req_size, t->act_size); |
| 575 | } |
| 576 | if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0; |
| 577 | for (i = 0; i < SCMD_ST_HIST_SZ; i++) { |
| 578 | cnt += sprintf(page + cnt, " %s", |
| 579 | ub_scsi_cmd_stname[(int)t->st_hst[nh]]); |
| 580 | if (++nh == SCMD_ST_HIST_SZ) nh = 0; |
| 581 | } |
| 582 | cnt += sprintf(page + cnt, "\n"); |
| 583 | |
| 584 | if (++nc == SCMD_TRACE_SZ) nc = 0; |
| 585 | } |
| 586 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 587 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | return cnt; |
| 589 | } |
| 590 | |
| 591 | static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */ |
| 592 | |
| 593 | /* |
| 594 | * The id allocator. |
| 595 | * |
| 596 | * This also stores the host for indexing by minor, which is somewhat dirty. |
| 597 | */ |
| 598 | static int ub_id_get(void) |
| 599 | { |
| 600 | unsigned long flags; |
| 601 | int i; |
| 602 | |
| 603 | spin_lock_irqsave(&ub_lock, flags); |
| 604 | for (i = 0; i < UB_MAX_HOSTS; i++) { |
| 605 | if (ub_hostv[i] == 0) { |
| 606 | ub_hostv[i] = 1; |
| 607 | spin_unlock_irqrestore(&ub_lock, flags); |
| 608 | return i; |
| 609 | } |
| 610 | } |
| 611 | spin_unlock_irqrestore(&ub_lock, flags); |
| 612 | return -1; |
| 613 | } |
| 614 | |
| 615 | static void ub_id_put(int id) |
| 616 | { |
| 617 | unsigned long flags; |
| 618 | |
| 619 | if (id < 0 || id >= UB_MAX_HOSTS) { |
| 620 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); |
| 621 | return; |
| 622 | } |
| 623 | |
| 624 | spin_lock_irqsave(&ub_lock, flags); |
| 625 | if (ub_hostv[id] == 0) { |
| 626 | spin_unlock_irqrestore(&ub_lock, flags); |
| 627 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); |
| 628 | return; |
| 629 | } |
| 630 | ub_hostv[id] = 0; |
| 631 | spin_unlock_irqrestore(&ub_lock, flags); |
| 632 | } |
| 633 | |
| 634 | /* |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 635 | * This is necessitated by the fact that blk_cleanup_queue does not |
| 636 | * necesserily destroy the queue. Instead, it may merely decrease q->refcnt. |
| 637 | * Since our blk_init_queue() passes a spinlock common with ub_dev, |
| 638 | * we have life time issues when ub_cleanup frees ub_dev. |
| 639 | */ |
| 640 | static spinlock_t *ub_next_lock(void) |
| 641 | { |
| 642 | unsigned long flags; |
| 643 | spinlock_t *ret; |
| 644 | |
| 645 | spin_lock_irqsave(&ub_lock, flags); |
| 646 | ret = &ub_qlockv[ub_qlock_next]; |
| 647 | ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM; |
| 648 | spin_unlock_irqrestore(&ub_lock, flags); |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | * Downcount for deallocation. This rides on two assumptions: |
| 654 | * - once something is poisoned, its refcount cannot grow |
| 655 | * - opens cannot happen at this time (del_gendisk was done) |
| 656 | * If the above is true, we can drop the lock, which we need for |
| 657 | * blk_cleanup_queue(): the silly thing may attempt to sleep. |
| 658 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] |
| 659 | */ |
| 660 | static void ub_put(struct ub_dev *sc) |
| 661 | { |
| 662 | unsigned long flags; |
| 663 | |
| 664 | spin_lock_irqsave(&ub_lock, flags); |
| 665 | --sc->openc; |
| 666 | if (sc->openc == 0 && atomic_read(&sc->poison)) { |
| 667 | spin_unlock_irqrestore(&ub_lock, flags); |
| 668 | ub_cleanup(sc); |
| 669 | } else { |
| 670 | spin_unlock_irqrestore(&ub_lock, flags); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* |
| 675 | * Final cleanup and deallocation. |
| 676 | */ |
| 677 | static void ub_cleanup(struct ub_dev *sc) |
| 678 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 679 | struct list_head *p; |
| 680 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | request_queue_t *q; |
| 682 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 683 | while (!list_empty(&sc->luns)) { |
| 684 | p = sc->luns.next; |
| 685 | lun = list_entry(p, struct ub_lun, link); |
| 686 | list_del(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 688 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ |
| 689 | if ((q = lun->disk->queue) != NULL) |
| 690 | blk_cleanup_queue(q); |
| 691 | /* |
| 692 | * If we zero disk->private_data BEFORE put_disk, we have |
| 693 | * to check for NULL all over the place in open, release, |
| 694 | * check_media and revalidate, because the block level |
| 695 | * semaphore is well inside the put_disk. |
| 696 | * But we cannot zero after the call, because *disk is gone. |
| 697 | * The sd.c is blatantly racy in this area. |
| 698 | */ |
| 699 | /* disk->private_data = NULL; */ |
| 700 | put_disk(lun->disk); |
| 701 | lun->disk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 703 | ub_id_put(lun->id); |
| 704 | kfree(lun); |
| 705 | } |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | kfree(sc); |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * The "command allocator". |
| 712 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 713 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | { |
| 715 | struct ub_scsi_cmd *ret; |
| 716 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 717 | if (lun->cmda[0]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | return NULL; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 719 | ret = &lun->cmdv[0]; |
| 720 | lun->cmda[0] = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | return ret; |
| 722 | } |
| 723 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 724 | static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 726 | if (cmd != &lun->cmdv[0]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 728 | lun->name, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | return; |
| 730 | } |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 731 | if (!lun->cmda[0]) { |
| 732 | printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | return; |
| 734 | } |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 735 | lun->cmda[0] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | /* |
| 739 | * The command queue. |
| 740 | */ |
| 741 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 742 | { |
| 743 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 744 | |
| 745 | if (t->qlen++ == 0) { |
| 746 | t->head = cmd; |
| 747 | t->tail = cmd; |
| 748 | } else { |
| 749 | t->tail->next = cmd; |
| 750 | t->tail = cmd; |
| 751 | } |
| 752 | |
| 753 | if (t->qlen > t->qmax) |
| 754 | t->qmax = t->qlen; |
| 755 | } |
| 756 | |
| 757 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 758 | { |
| 759 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 760 | |
| 761 | if (t->qlen++ == 0) { |
| 762 | t->head = cmd; |
| 763 | t->tail = cmd; |
| 764 | } else { |
| 765 | cmd->next = t->head; |
| 766 | t->head = cmd; |
| 767 | } |
| 768 | |
| 769 | if (t->qlen > t->qmax) |
| 770 | t->qmax = t->qlen; |
| 771 | } |
| 772 | |
| 773 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) |
| 774 | { |
| 775 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 776 | struct ub_scsi_cmd *cmd; |
| 777 | |
| 778 | if (t->qlen == 0) |
| 779 | return NULL; |
| 780 | if (--t->qlen == 0) |
| 781 | t->tail = NULL; |
| 782 | cmd = t->head; |
| 783 | t->head = cmd->next; |
| 784 | cmd->next = NULL; |
| 785 | return cmd; |
| 786 | } |
| 787 | |
| 788 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) |
| 789 | |
| 790 | /* |
| 791 | * The request function is our main entry point |
| 792 | */ |
| 793 | |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 794 | static void ub_request_fn(request_queue_t *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 796 | struct ub_lun *lun = q->queuedata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | struct request *rq; |
| 798 | |
| 799 | while ((rq = elv_next_request(q)) != NULL) { |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 800 | if (ub_request_fn_1(lun, rq) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | blk_stop_queue(q); |
| 802 | break; |
| 803 | } |
| 804 | } |
| 805 | } |
| 806 | |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 807 | static int ub_request_fn_1(struct ub_lun *lun, struct request *rq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 809 | struct ub_dev *sc = lun->udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | struct ub_scsi_cmd *cmd; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 811 | struct ub_request *urq; |
| 812 | int n_elem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 814 | if (atomic_read(&sc->poison) || lun->changed) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | blkdev_dequeue_request(rq); |
| 816 | ub_end_rq(rq, 0); |
| 817 | return 0; |
| 818 | } |
| 819 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 820 | if (lun->urq.rq != NULL) |
| 821 | return -1; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 822 | if ((cmd = ub_get_cmd(lun)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | return -1; |
| 824 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); |
| 825 | |
| 826 | blkdev_dequeue_request(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 828 | urq = &lun->urq; |
| 829 | memset(urq, 0, sizeof(struct ub_request)); |
| 830 | urq->rq = rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | /* |
| 833 | * get scatterlist from block layer |
| 834 | */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 835 | n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]); |
| 836 | if (n_elem < 0) { |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 837 | printk(KERN_INFO "%s: failed request map (%d)\n", |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 838 | lun->name, n_elem); /* P3 */ |
| 839 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 841 | if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | printk(KERN_WARNING "%s: request with %d segments\n", |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 843 | lun->name, n_elem); |
| 844 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 846 | urq->nsg = n_elem; |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 847 | sc->sg_stat[n_elem < 5 ? n_elem : 5]++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 849 | if (blk_pc_request(rq)) { |
| 850 | ub_cmd_build_packet(sc, lun, cmd, urq); |
| 851 | } else { |
| 852 | ub_cmd_build_block(sc, lun, cmd, urq); |
| 853 | } |
| 854 | cmd->state = UB_CMDST_INIT; |
| 855 | cmd->lun = lun; |
| 856 | cmd->done = ub_rw_cmd_done; |
| 857 | cmd->back = urq; |
| 858 | |
| 859 | cmd->tag = sc->tagcnt++; |
| 860 | if (ub_submit_scsi(sc, cmd) != 0) |
| 861 | goto drop; |
| 862 | |
| 863 | return 0; |
| 864 | |
| 865 | drop: |
| 866 | ub_put_cmd(lun, cmd); |
| 867 | ub_end_rq(rq, 0); |
| 868 | return 0; |
| 869 | } |
| 870 | |
| 871 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
| 872 | struct ub_scsi_cmd *cmd, struct ub_request *urq) |
| 873 | { |
| 874 | struct request *rq = urq->rq; |
| 875 | unsigned int block, nblks; |
| 876 | |
| 877 | if (rq_data_dir(rq) == WRITE) |
| 878 | cmd->dir = UB_DIR_WRITE; |
| 879 | else |
| 880 | cmd->dir = UB_DIR_READ; |
| 881 | |
| 882 | cmd->nsg = urq->nsg; |
| 883 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); |
| 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | /* |
| 886 | * build the command |
| 887 | * |
| 888 | * The call to blk_queue_hardsect_size() guarantees that request |
| 889 | * is aligned, but it is given in terms of 512 byte units, always. |
| 890 | */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 891 | block = rq->sector >> lun->capacity.bshift; |
| 892 | nblks = rq->nr_sectors >> lun->capacity.bshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 894 | cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ |
| 896 | cmd->cdb[2] = block >> 24; |
| 897 | cmd->cdb[3] = block >> 16; |
| 898 | cmd->cdb[4] = block >> 8; |
| 899 | cmd->cdb[5] = block; |
| 900 | cmd->cdb[7] = nblks >> 8; |
| 901 | cmd->cdb[8] = nblks; |
| 902 | cmd->cdb_len = 10; |
| 903 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 904 | cmd->len = rq->nr_sectors * 512; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | } |
| 906 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 907 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, |
| 908 | struct ub_scsi_cmd *cmd, struct ub_request *urq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 910 | struct request *rq = urq->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
| 912 | if (rq->data_len == 0) { |
| 913 | cmd->dir = UB_DIR_NONE; |
| 914 | } else { |
| 915 | if (rq_data_dir(rq) == WRITE) |
| 916 | cmd->dir = UB_DIR_WRITE; |
| 917 | else |
| 918 | cmd->dir = UB_DIR_READ; |
| 919 | } |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 920 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 921 | cmd->nsg = urq->nsg; |
| 922 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 923 | |
| 924 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); |
| 925 | cmd->cdb_len = rq->cmd_len; |
| 926 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | cmd->len = rq->data_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 931 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 932 | struct ub_lun *lun = cmd->lun; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 933 | struct ub_request *urq = cmd->back; |
| 934 | struct request *rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | int uptodate; |
| 936 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 937 | rq = urq->rq; |
| 938 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 939 | if (cmd->error == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | uptodate = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 942 | if (blk_pc_request(rq)) { |
| 943 | if (cmd->act_len >= rq->data_len) |
| 944 | rq->data_len = 0; |
| 945 | else |
| 946 | rq->data_len -= cmd->act_len; |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 947 | } |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 948 | } else { |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 949 | uptodate = 0; |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 950 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 951 | if (blk_pc_request(rq)) { |
| 952 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ |
| 953 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); |
| 954 | rq->sense_len = UB_SENSE_SIZE; |
| 955 | if (sc->top_sense[0] != 0) |
| 956 | rq->errors = SAM_STAT_CHECK_CONDITION; |
| 957 | else |
| 958 | rq->errors = DID_ERROR << 16; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 959 | } else { |
| 960 | if (cmd->error == -EIO) { |
| 961 | if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0) |
| 962 | return; |
| 963 | } |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 964 | } |
| 965 | } |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 966 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 967 | urq->rq = NULL; |
| 968 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 969 | ub_put_cmd(lun, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | ub_end_rq(rq, uptodate); |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 971 | blk_start_queue(lun->disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | static void ub_end_rq(struct request *rq, int uptodate) |
| 975 | { |
Daniel Marjamaki | ab93091 | 2005-12-17 02:38:46 -0800 | [diff] [blame] | 976 | end_that_request_first(rq, uptodate, rq->hard_nr_sectors); |
Tejun Heo | 8ffdc65 | 2006-01-06 09:49:03 +0100 | [diff] [blame] | 977 | end_that_request_last(rq, uptodate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | } |
| 979 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 980 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
| 981 | struct ub_request *urq, struct ub_scsi_cmd *cmd) |
| 982 | { |
| 983 | |
| 984 | if (atomic_read(&sc->poison)) |
| 985 | return -ENXIO; |
| 986 | |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 987 | ub_reset_enter(sc, urq->current_try); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 988 | |
| 989 | if (urq->current_try >= 3) |
| 990 | return -EIO; |
| 991 | urq->current_try++; |
| 992 | /* P3 */ printk("%s: dir %c len/act %d/%d " |
| 993 | "[sense %x %02x %02x] retry %d\n", |
| 994 | sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len, |
| 995 | cmd->key, cmd->asc, cmd->ascq, urq->current_try); |
| 996 | |
| 997 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); |
| 998 | ub_cmd_build_block(sc, lun, cmd, urq); |
| 999 | |
| 1000 | cmd->state = UB_CMDST_INIT; |
| 1001 | cmd->lun = lun; |
| 1002 | cmd->done = ub_rw_cmd_done; |
| 1003 | cmd->back = urq; |
| 1004 | |
| 1005 | cmd->tag = sc->tagcnt++; |
| 1006 | |
| 1007 | #if 0 /* Wasteful */ |
| 1008 | return ub_submit_scsi(sc, cmd); |
| 1009 | #else |
| 1010 | ub_cmdq_add(sc, cmd); |
| 1011 | return 0; |
| 1012 | #endif |
| 1013 | } |
| 1014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | /* |
| 1016 | * Submit a regular SCSI operation (not an auto-sense). |
| 1017 | * |
| 1018 | * The Iron Law of Good Submit Routine is: |
| 1019 | * Zero return - callback is done, Nonzero return - callback is not done. |
| 1020 | * No exceptions. |
| 1021 | * |
| 1022 | * Host is assumed locked. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | */ |
| 1024 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1025 | { |
| 1026 | |
| 1027 | if (cmd->state != UB_CMDST_INIT || |
| 1028 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { |
| 1029 | return -EINVAL; |
| 1030 | } |
| 1031 | |
| 1032 | ub_cmdq_add(sc, cmd); |
| 1033 | /* |
| 1034 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little |
| 1035 | * safer to jump to a tasklet, in case upper layers do something silly. |
| 1036 | */ |
| 1037 | tasklet_schedule(&sc->tasklet); |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * Submit the first URB for the queued command. |
| 1043 | * This function does not deal with queueing in any way. |
| 1044 | */ |
| 1045 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1046 | { |
| 1047 | struct bulk_cb_wrap *bcb; |
| 1048 | int rc; |
| 1049 | |
| 1050 | bcb = &sc->work_bcb; |
| 1051 | |
| 1052 | /* |
| 1053 | * ``If the allocation length is eighteen or greater, and a device |
| 1054 | * server returns less than eithteen bytes of data, the application |
| 1055 | * client should assume that the bytes not transferred would have been |
| 1056 | * zeroes had the device server returned those bytes.'' |
| 1057 | * |
| 1058 | * We zero sense for all commands so that when a packet request |
| 1059 | * fails it does not return a stale sense. |
| 1060 | */ |
| 1061 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); |
| 1062 | |
| 1063 | /* set up the command wrapper */ |
| 1064 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); |
| 1065 | bcb->Tag = cmd->tag; /* Endianness is not important */ |
| 1066 | bcb->DataTransferLength = cpu_to_le32(cmd->len); |
| 1067 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1068 | bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | bcb->Length = cmd->cdb_len; |
| 1070 | |
| 1071 | /* copy the command payload */ |
| 1072 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); |
| 1073 | |
| 1074 | UB_INIT_COMPLETION(sc->work_done); |
| 1075 | |
| 1076 | sc->last_pipe = sc->send_bulk_pipe; |
| 1077 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, |
| 1078 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
| 1080 | /* Fill what we shouldn't be filling, because usb-storage did so. */ |
| 1081 | sc->work_urb.actual_length = 0; |
| 1082 | sc->work_urb.error_count = 0; |
| 1083 | sc->work_urb.status = 0; |
| 1084 | |
| 1085 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1086 | /* XXX Clear stalls */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | ub_complete(&sc->work_done); |
| 1088 | return rc; |
| 1089 | } |
| 1090 | |
| 1091 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; |
| 1092 | add_timer(&sc->work_timer); |
| 1093 | |
| 1094 | cmd->state = UB_CMDST_CMD; |
| 1095 | ub_cmdtr_state(sc, cmd); |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | /* |
| 1100 | * Timeout handler. |
| 1101 | */ |
| 1102 | static void ub_urb_timeout(unsigned long arg) |
| 1103 | { |
| 1104 | struct ub_dev *sc = (struct ub_dev *) arg; |
| 1105 | unsigned long flags; |
| 1106 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1107 | spin_lock_irqsave(sc->lock, flags); |
Pete Zaitcev | b31f821 | 2006-01-05 00:14:02 -0800 | [diff] [blame] | 1108 | if (!ub_is_completed(&sc->work_done)) |
| 1109 | usb_unlink_urb(&sc->work_urb); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1110 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
| 1113 | /* |
| 1114 | * Completion routine for the work URB. |
| 1115 | * |
| 1116 | * This can be called directly from usb_submit_urb (while we have |
| 1117 | * the sc->lock taken) and from an interrupt (while we do NOT have |
| 1118 | * the sc->lock taken). Therefore, bounce this off to a tasklet. |
| 1119 | */ |
| 1120 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt) |
| 1121 | { |
| 1122 | struct ub_dev *sc = urb->context; |
| 1123 | |
| 1124 | ub_complete(&sc->work_done); |
| 1125 | tasklet_schedule(&sc->tasklet); |
| 1126 | } |
| 1127 | |
| 1128 | static void ub_scsi_action(unsigned long _dev) |
| 1129 | { |
| 1130 | struct ub_dev *sc = (struct ub_dev *) _dev; |
| 1131 | unsigned long flags; |
| 1132 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1133 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | ub_scsi_dispatch(sc); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1135 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | } |
| 1137 | |
| 1138 | static void ub_scsi_dispatch(struct ub_dev *sc) |
| 1139 | { |
| 1140 | struct ub_scsi_cmd *cmd; |
| 1141 | int rc; |
| 1142 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1143 | while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (cmd->state == UB_CMDST_DONE) { |
| 1145 | ub_cmdq_pop(sc); |
| 1146 | (*cmd->done)(sc, cmd); |
| 1147 | } else if (cmd->state == UB_CMDST_INIT) { |
| 1148 | ub_cmdtr_new(sc, cmd); |
| 1149 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) |
| 1150 | break; |
| 1151 | cmd->error = rc; |
| 1152 | cmd->state = UB_CMDST_DONE; |
| 1153 | ub_cmdtr_state(sc, cmd); |
| 1154 | } else { |
| 1155 | if (!ub_is_completed(&sc->work_done)) |
| 1156 | break; |
Pete Zaitcev | b31f821 | 2006-01-05 00:14:02 -0800 | [diff] [blame] | 1157 | del_timer(&sc->work_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | ub_scsi_urb_compl(sc, cmd); |
| 1159 | } |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1164 | { |
| 1165 | struct urb *urb = &sc->work_urb; |
| 1166 | struct bulk_cs_wrap *bcs; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1167 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | int rc; |
| 1169 | |
| 1170 | if (atomic_read(&sc->poison)) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1171 | ub_state_done(sc, cmd, -ENODEV); |
| 1172 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | if (cmd->state == UB_CMDST_CLEAR) { |
| 1176 | if (urb->status == -EPIPE) { |
| 1177 | /* |
| 1178 | * STALL while clearning STALL. |
| 1179 | * The control pipe clears itself - nothing to do. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1181 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1182 | sc->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | goto Bad_End; |
| 1184 | } |
| 1185 | |
| 1186 | /* |
| 1187 | * We ignore the result for the halt clear. |
| 1188 | */ |
| 1189 | |
| 1190 | /* reset the endpoint toggle */ |
| 1191 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), |
| 1192 | usb_pipeout(sc->last_pipe), 0); |
| 1193 | |
| 1194 | ub_state_sense(sc, cmd); |
| 1195 | |
| 1196 | } else if (cmd->state == UB_CMDST_CLR2STS) { |
| 1197 | if (urb->status == -EPIPE) { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1198 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1199 | sc->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | goto Bad_End; |
| 1201 | } |
| 1202 | |
| 1203 | /* |
| 1204 | * We ignore the result for the halt clear. |
| 1205 | */ |
| 1206 | |
| 1207 | /* reset the endpoint toggle */ |
| 1208 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), |
| 1209 | usb_pipeout(sc->last_pipe), 0); |
| 1210 | |
| 1211 | ub_state_stat(sc, cmd); |
| 1212 | |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1213 | } else if (cmd->state == UB_CMDST_CLRRS) { |
| 1214 | if (urb->status == -EPIPE) { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1215 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1216 | sc->name); |
| 1217 | goto Bad_End; |
| 1218 | } |
| 1219 | |
| 1220 | /* |
| 1221 | * We ignore the result for the halt clear. |
| 1222 | */ |
| 1223 | |
| 1224 | /* reset the endpoint toggle */ |
| 1225 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), |
| 1226 | usb_pipeout(sc->last_pipe), 0); |
| 1227 | |
| 1228 | ub_state_stat_counted(sc, cmd); |
| 1229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | } else if (cmd->state == UB_CMDST_CMD) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1231 | switch (urb->status) { |
| 1232 | case 0: |
| 1233 | break; |
| 1234 | case -EOVERFLOW: |
| 1235 | goto Bad_End; |
| 1236 | case -EPIPE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1238 | if (rc != 0) { |
| 1239 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1240 | "unable to submit clear (%d)\n", |
| 1241 | sc->name, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | /* |
| 1243 | * This is typically ENOMEM or some other such shit. |
| 1244 | * Retrying is pointless. Just do Bad End on it... |
| 1245 | */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1246 | ub_state_done(sc, cmd, rc); |
| 1247 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
| 1249 | cmd->state = UB_CMDST_CLEAR; |
| 1250 | ub_cmdtr_state(sc, cmd); |
| 1251 | return; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1252 | case -ESHUTDOWN: /* unplug */ |
| 1253 | case -EILSEQ: /* unplug timeout on uhci */ |
| 1254 | ub_state_done(sc, cmd, -ENODEV); |
| 1255 | return; |
| 1256 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | goto Bad_End; |
| 1258 | } |
| 1259 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | goto Bad_End; |
| 1261 | } |
| 1262 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1263 | if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | ub_state_stat(sc, cmd); |
| 1265 | return; |
| 1266 | } |
| 1267 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1268 | // udelay(125); // usb-storage has this |
| 1269 | ub_data_start(sc, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
| 1271 | } else if (cmd->state == UB_CMDST_DATA) { |
| 1272 | if (urb->status == -EPIPE) { |
| 1273 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1274 | if (rc != 0) { |
| 1275 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1276 | "unable to submit clear (%d)\n", |
| 1277 | sc->name, rc); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1278 | ub_state_done(sc, cmd, rc); |
| 1279 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | } |
| 1281 | cmd->state = UB_CMDST_CLR2STS; |
| 1282 | ub_cmdtr_state(sc, cmd); |
| 1283 | return; |
| 1284 | } |
| 1285 | if (urb->status == -EOVERFLOW) { |
| 1286 | /* |
| 1287 | * A babble? Failure, but we must transfer CSW now. |
| 1288 | */ |
| 1289 | cmd->error = -EOVERFLOW; /* A cheap trick... */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1290 | ub_state_stat(sc, cmd); |
| 1291 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1293 | |
| 1294 | if (cmd->dir == UB_DIR_WRITE) { |
| 1295 | /* |
| 1296 | * Do not continue writes in case of a failure. |
| 1297 | * Doing so would cause sectors to be mixed up, |
| 1298 | * which is worse than sectors lost. |
| 1299 | * |
| 1300 | * We must try to read the CSW, or many devices |
| 1301 | * get confused. |
| 1302 | */ |
| 1303 | len = urb->actual_length; |
| 1304 | if (urb->status != 0 || |
| 1305 | len != cmd->sgv[cmd->current_sg].length) { |
| 1306 | cmd->act_len += len; |
| 1307 | ub_cmdtr_act_len(sc, cmd); |
| 1308 | |
| 1309 | cmd->error = -EIO; |
| 1310 | ub_state_stat(sc, cmd); |
| 1311 | return; |
| 1312 | } |
| 1313 | |
| 1314 | } else { |
| 1315 | /* |
| 1316 | * If an error occurs on read, we record it, and |
| 1317 | * continue to fetch data in order to avoid bubble. |
| 1318 | * |
| 1319 | * As a small shortcut, we stop if we detect that |
| 1320 | * a CSW mixed into data. |
| 1321 | */ |
| 1322 | if (urb->status != 0) |
| 1323 | cmd->error = -EIO; |
| 1324 | |
| 1325 | len = urb->actual_length; |
| 1326 | if (urb->status != 0 || |
| 1327 | len != cmd->sgv[cmd->current_sg].length) { |
| 1328 | if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN) |
| 1329 | goto Bad_End; |
| 1330 | } |
| 1331 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1333 | cmd->act_len += urb->actual_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | ub_cmdtr_act_len(sc, cmd); |
| 1335 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1336 | if (++cmd->current_sg < cmd->nsg) { |
| 1337 | ub_data_start(sc, cmd); |
| 1338 | return; |
| 1339 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | ub_state_stat(sc, cmd); |
| 1341 | |
| 1342 | } else if (cmd->state == UB_CMDST_STAT) { |
| 1343 | if (urb->status == -EPIPE) { |
| 1344 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1345 | if (rc != 0) { |
| 1346 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1347 | "unable to submit clear (%d)\n", |
| 1348 | sc->name, rc); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1349 | ub_state_done(sc, cmd, rc); |
| 1350 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | } |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1352 | |
| 1353 | /* |
| 1354 | * Having a stall when getting CSW is an error, so |
| 1355 | * make sure uppper levels are not oblivious to it. |
| 1356 | */ |
| 1357 | cmd->error = -EIO; /* A cheap trick... */ |
| 1358 | |
| 1359 | cmd->state = UB_CMDST_CLRRS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | ub_cmdtr_state(sc, cmd); |
| 1361 | return; |
| 1362 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1363 | |
| 1364 | /* Catch everything, including -EOVERFLOW and other nasties. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | if (urb->status != 0) |
| 1366 | goto Bad_End; |
| 1367 | |
| 1368 | if (urb->actual_length == 0) { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1369 | ub_state_stat_counted(sc, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return; |
| 1371 | } |
| 1372 | |
| 1373 | /* |
| 1374 | * Check the returned Bulk protocol status. |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1375 | * The status block has to be validated first. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | */ |
| 1377 | |
| 1378 | bcs = &sc->work_bcs; |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1379 | |
| 1380 | if (sc->signature == cpu_to_le32(0)) { |
| 1381 | /* |
| 1382 | * This is the first reply, so do not perform the check. |
| 1383 | * Instead, remember the signature the device uses |
| 1384 | * for future checks. But do not allow a nul. |
| 1385 | */ |
| 1386 | sc->signature = bcs->Signature; |
| 1387 | if (sc->signature == cpu_to_le32(0)) { |
| 1388 | ub_state_stat_counted(sc, cmd); |
| 1389 | return; |
| 1390 | } |
| 1391 | } else { |
| 1392 | if (bcs->Signature != sc->signature) { |
| 1393 | ub_state_stat_counted(sc, cmd); |
| 1394 | return; |
| 1395 | } |
| 1396 | } |
| 1397 | |
| 1398 | if (bcs->Tag != cmd->tag) { |
| 1399 | /* |
| 1400 | * This usually happens when we disagree with the |
| 1401 | * device's microcode about something. For instance, |
| 1402 | * a few of them throw this after timeouts. They buffer |
| 1403 | * commands and reply at commands we timed out before. |
| 1404 | * Without flushing these replies we loop forever. |
| 1405 | */ |
| 1406 | ub_state_stat_counted(sc, cmd); |
| 1407 | return; |
| 1408 | } |
| 1409 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1410 | len = le32_to_cpu(bcs->Residue); |
| 1411 | if (len != cmd->len - cmd->act_len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | /* |
| 1413 | * It is all right to transfer less, the caller has |
| 1414 | * to check. But it's not all right if the device |
| 1415 | * counts disagree with our counts. |
| 1416 | */ |
| 1417 | /* P3 */ printk("%s: resid %d len %d act %d\n", |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1418 | sc->name, len, cmd->len, cmd->act_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | goto Bad_End; |
| 1420 | } |
| 1421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | switch (bcs->Status) { |
| 1423 | case US_BULK_STAT_OK: |
| 1424 | break; |
| 1425 | case US_BULK_STAT_FAIL: |
| 1426 | ub_state_sense(sc, cmd); |
| 1427 | return; |
| 1428 | case US_BULK_STAT_PHASE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | /* P3 */ printk("%s: status PHASE\n", sc->name); |
| 1430 | goto Bad_End; |
| 1431 | default: |
| 1432 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", |
| 1433 | sc->name, bcs->Status); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1434 | ub_state_done(sc, cmd, -EINVAL); |
| 1435 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | } |
| 1437 | |
| 1438 | /* Not zeroing error to preserve a babble indicator */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1439 | if (cmd->error != 0) { |
| 1440 | ub_state_sense(sc, cmd); |
| 1441 | return; |
| 1442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | cmd->state = UB_CMDST_DONE; |
| 1444 | ub_cmdtr_state(sc, cmd); |
| 1445 | ub_cmdq_pop(sc); |
| 1446 | (*cmd->done)(sc, cmd); |
| 1447 | |
| 1448 | } else if (cmd->state == UB_CMDST_SENSE) { |
| 1449 | ub_state_done(sc, cmd, -EIO); |
| 1450 | |
| 1451 | } else { |
| 1452 | printk(KERN_WARNING "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1453 | "wrong command state %d\n", |
| 1454 | sc->name, cmd->state); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1455 | ub_state_done(sc, cmd, -EINVAL); |
| 1456 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | } |
| 1458 | return; |
| 1459 | |
| 1460 | Bad_End: /* Little Excel is dead */ |
| 1461 | ub_state_done(sc, cmd, -EIO); |
| 1462 | } |
| 1463 | |
| 1464 | /* |
| 1465 | * Factorization helper for the command state machine: |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1466 | * Initiate a data segment transfer. |
| 1467 | */ |
| 1468 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1469 | { |
| 1470 | struct scatterlist *sg = &cmd->sgv[cmd->current_sg]; |
| 1471 | int pipe; |
| 1472 | int rc; |
| 1473 | |
| 1474 | UB_INIT_COMPLETION(sc->work_done); |
| 1475 | |
| 1476 | if (cmd->dir == UB_DIR_READ) |
| 1477 | pipe = sc->recv_bulk_pipe; |
| 1478 | else |
| 1479 | pipe = sc->send_bulk_pipe; |
| 1480 | sc->last_pipe = pipe; |
| 1481 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, |
| 1482 | page_address(sg->page) + sg->offset, sg->length, |
| 1483 | ub_urb_complete, sc); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1484 | sc->work_urb.actual_length = 0; |
| 1485 | sc->work_urb.error_count = 0; |
| 1486 | sc->work_urb.status = 0; |
| 1487 | |
| 1488 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1489 | /* XXX Clear stalls */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1490 | ub_complete(&sc->work_done); |
| 1491 | ub_state_done(sc, cmd, rc); |
| 1492 | return; |
| 1493 | } |
| 1494 | |
| 1495 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; |
| 1496 | add_timer(&sc->work_timer); |
| 1497 | |
| 1498 | cmd->state = UB_CMDST_DATA; |
| 1499 | ub_cmdtr_state(sc, cmd); |
| 1500 | } |
| 1501 | |
| 1502 | /* |
| 1503 | * Factorization helper for the command state machine: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | * Finish the command. |
| 1505 | */ |
| 1506 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) |
| 1507 | { |
| 1508 | |
| 1509 | cmd->error = rc; |
| 1510 | cmd->state = UB_CMDST_DONE; |
| 1511 | ub_cmdtr_state(sc, cmd); |
| 1512 | ub_cmdq_pop(sc); |
| 1513 | (*cmd->done)(sc, cmd); |
| 1514 | } |
| 1515 | |
| 1516 | /* |
| 1517 | * Factorization helper for the command state machine: |
| 1518 | * Submit a CSW read. |
| 1519 | */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1520 | static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | { |
| 1522 | int rc; |
| 1523 | |
| 1524 | UB_INIT_COMPLETION(sc->work_done); |
| 1525 | |
| 1526 | sc->last_pipe = sc->recv_bulk_pipe; |
| 1527 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, |
| 1528 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | sc->work_urb.actual_length = 0; |
| 1530 | sc->work_urb.error_count = 0; |
| 1531 | sc->work_urb.status = 0; |
| 1532 | |
| 1533 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1534 | /* XXX Clear stalls */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | ub_complete(&sc->work_done); |
| 1536 | ub_state_done(sc, cmd, rc); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1537 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
| 1540 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; |
| 1541 | add_timer(&sc->work_timer); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1542 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | } |
| 1544 | |
| 1545 | /* |
| 1546 | * Factorization helper for the command state machine: |
| 1547 | * Submit a CSW read and go to STAT state. |
| 1548 | */ |
| 1549 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1550 | { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1551 | |
| 1552 | if (__ub_state_stat(sc, cmd) != 0) |
| 1553 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | |
| 1555 | cmd->stat_count = 0; |
| 1556 | cmd->state = UB_CMDST_STAT; |
| 1557 | ub_cmdtr_state(sc, cmd); |
| 1558 | } |
| 1559 | |
| 1560 | /* |
| 1561 | * Factorization helper for the command state machine: |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1562 | * Submit a CSW read and go to STAT state with counter (along [C] path). |
| 1563 | */ |
| 1564 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1565 | { |
| 1566 | |
| 1567 | if (++cmd->stat_count >= 4) { |
| 1568 | ub_state_sense(sc, cmd); |
| 1569 | return; |
| 1570 | } |
| 1571 | |
| 1572 | if (__ub_state_stat(sc, cmd) != 0) |
| 1573 | return; |
| 1574 | |
| 1575 | cmd->state = UB_CMDST_STAT; |
| 1576 | ub_cmdtr_state(sc, cmd); |
| 1577 | } |
| 1578 | |
| 1579 | /* |
| 1580 | * Factorization helper for the command state machine: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | * Submit a REQUEST SENSE and go to SENSE state. |
| 1582 | */ |
| 1583 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1584 | { |
| 1585 | struct ub_scsi_cmd *scmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1586 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | int rc; |
| 1588 | |
| 1589 | if (cmd->cdb[0] == REQUEST_SENSE) { |
| 1590 | rc = -EPIPE; |
| 1591 | goto error; |
| 1592 | } |
| 1593 | |
| 1594 | scmd = &sc->top_rqs_cmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1595 | memset(scmd, 0, sizeof(struct ub_scsi_cmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | scmd->cdb[0] = REQUEST_SENSE; |
| 1597 | scmd->cdb[4] = UB_SENSE_SIZE; |
| 1598 | scmd->cdb_len = 6; |
| 1599 | scmd->dir = UB_DIR_READ; |
| 1600 | scmd->state = UB_CMDST_INIT; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1601 | scmd->nsg = 1; |
| 1602 | sg = &scmd->sgv[0]; |
| 1603 | sg->page = virt_to_page(sc->top_sense); |
Pete Zaitcev | 38ffdd6 | 2005-09-24 13:10:16 -0700 | [diff] [blame] | 1604 | sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1605 | sg->length = UB_SENSE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | scmd->len = UB_SENSE_SIZE; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1607 | scmd->lun = cmd->lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | scmd->done = ub_top_sense_done; |
| 1609 | scmd->back = cmd; |
| 1610 | |
| 1611 | scmd->tag = sc->tagcnt++; |
| 1612 | |
| 1613 | cmd->state = UB_CMDST_SENSE; |
| 1614 | ub_cmdtr_state(sc, cmd); |
| 1615 | |
| 1616 | ub_cmdq_insert(sc, scmd); |
| 1617 | return; |
| 1618 | |
| 1619 | error: |
| 1620 | ub_state_done(sc, cmd, rc); |
| 1621 | } |
| 1622 | |
| 1623 | /* |
| 1624 | * A helper for the command's state machine: |
| 1625 | * Submit a stall clear. |
| 1626 | */ |
| 1627 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
| 1628 | int stalled_pipe) |
| 1629 | { |
| 1630 | int endp; |
| 1631 | struct usb_ctrlrequest *cr; |
| 1632 | int rc; |
| 1633 | |
| 1634 | endp = usb_pipeendpoint(stalled_pipe); |
| 1635 | if (usb_pipein (stalled_pipe)) |
| 1636 | endp |= USB_DIR_IN; |
| 1637 | |
| 1638 | cr = &sc->work_cr; |
| 1639 | cr->bRequestType = USB_RECIP_ENDPOINT; |
| 1640 | cr->bRequest = USB_REQ_CLEAR_FEATURE; |
| 1641 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); |
| 1642 | cr->wIndex = cpu_to_le16(endp); |
| 1643 | cr->wLength = cpu_to_le16(0); |
| 1644 | |
| 1645 | UB_INIT_COMPLETION(sc->work_done); |
| 1646 | |
| 1647 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 1648 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | sc->work_urb.actual_length = 0; |
| 1650 | sc->work_urb.error_count = 0; |
| 1651 | sc->work_urb.status = 0; |
| 1652 | |
| 1653 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1654 | ub_complete(&sc->work_done); |
| 1655 | return rc; |
| 1656 | } |
| 1657 | |
| 1658 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 1659 | add_timer(&sc->work_timer); |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
| 1663 | /* |
| 1664 | */ |
| 1665 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) |
| 1666 | { |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1667 | unsigned char *sense = sc->top_sense; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | struct ub_scsi_cmd *cmd; |
| 1669 | |
| 1670 | /* |
| 1671 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. |
| 1672 | */ |
| 1673 | ub_cmdtr_sense(sc, scmd, sense); |
| 1674 | |
| 1675 | /* |
| 1676 | * Find the command which triggered the unit attention or a check, |
| 1677 | * save the sense into it, and advance its state machine. |
| 1678 | */ |
| 1679 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { |
| 1680 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); |
| 1681 | return; |
| 1682 | } |
| 1683 | if (cmd != scmd->back) { |
| 1684 | printk(KERN_WARNING "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1685 | "sense done for wrong command 0x%x\n", |
| 1686 | sc->name, cmd->tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | return; |
| 1688 | } |
| 1689 | if (cmd->state != UB_CMDST_SENSE) { |
| 1690 | printk(KERN_WARNING "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1691 | "sense done with bad cmd state %d\n", |
| 1692 | sc->name, cmd->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | return; |
| 1694 | } |
| 1695 | |
| 1696 | cmd->key = sense[2] & 0x0F; |
| 1697 | cmd->asc = sense[12]; |
| 1698 | cmd->ascq = sense[13]; |
| 1699 | |
| 1700 | ub_scsi_urb_compl(sc, cmd); |
| 1701 | } |
| 1702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | /* |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1704 | * Reset management |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 1705 | * XXX Move usb_reset_device to khubd. Hogging kevent is not a good thing. |
| 1706 | * XXX Make usb_sync_reset asynchronous. |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1707 | */ |
| 1708 | |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 1709 | static void ub_reset_enter(struct ub_dev *sc, int try) |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1710 | { |
| 1711 | |
| 1712 | if (sc->reset) { |
| 1713 | /* This happens often on multi-LUN devices. */ |
| 1714 | return; |
| 1715 | } |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 1716 | sc->reset = try + 1; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1717 | |
| 1718 | #if 0 /* Not needed because the disconnect waits for us. */ |
| 1719 | unsigned long flags; |
| 1720 | spin_lock_irqsave(&ub_lock, flags); |
| 1721 | sc->openc++; |
| 1722 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1723 | #endif |
| 1724 | |
| 1725 | #if 0 /* We let them stop themselves. */ |
| 1726 | struct list_head *p; |
| 1727 | struct ub_lun *lun; |
| 1728 | list_for_each(p, &sc->luns) { |
| 1729 | lun = list_entry(p, struct ub_lun, link); |
| 1730 | blk_stop_queue(lun->disk->queue); |
| 1731 | } |
| 1732 | #endif |
| 1733 | |
| 1734 | schedule_work(&sc->reset_work); |
| 1735 | } |
| 1736 | |
| 1737 | static void ub_reset_task(void *arg) |
| 1738 | { |
| 1739 | struct ub_dev *sc = arg; |
| 1740 | unsigned long flags; |
| 1741 | struct list_head *p; |
| 1742 | struct ub_lun *lun; |
| 1743 | int lkr, rc; |
| 1744 | |
| 1745 | if (!sc->reset) { |
| 1746 | printk(KERN_WARNING "%s: Running reset unrequested\n", |
| 1747 | sc->name); |
| 1748 | return; |
| 1749 | } |
| 1750 | |
| 1751 | if (atomic_read(&sc->poison)) { |
| 1752 | printk(KERN_NOTICE "%s: Not resetting disconnected device\n", |
| 1753 | sc->name); /* P3 This floods. Remove soon. XXX */ |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 1754 | } else if ((sc->reset & 1) == 0) { |
| 1755 | ub_sync_reset(sc); |
| 1756 | msleep(700); /* usb-storage sleeps 6s (!) */ |
| 1757 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
| 1758 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1759 | } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) { |
| 1760 | printk(KERN_NOTICE "%s: Not resetting multi-interface device\n", |
| 1761 | sc->name); /* P3 This floods. Remove soon. XXX */ |
| 1762 | } else { |
| 1763 | if ((lkr = usb_lock_device_for_reset(sc->dev, sc->intf)) < 0) { |
| 1764 | printk(KERN_NOTICE |
| 1765 | "%s: usb_lock_device_for_reset failed (%d)\n", |
| 1766 | sc->name, lkr); |
| 1767 | } else { |
| 1768 | rc = usb_reset_device(sc->dev); |
| 1769 | if (rc < 0) { |
| 1770 | printk(KERN_NOTICE "%s: " |
| 1771 | "usb_lock_device_for_reset failed (%d)\n", |
| 1772 | sc->name, rc); |
| 1773 | } |
| 1774 | |
| 1775 | if (lkr) |
| 1776 | usb_unlock_device(sc->dev); |
| 1777 | } |
| 1778 | } |
| 1779 | |
| 1780 | /* |
| 1781 | * In theory, no commands can be running while reset is active, |
| 1782 | * so nobody can ask for another reset, and so we do not need any |
| 1783 | * queues of resets or anything. We do need a spinlock though, |
| 1784 | * to interact with block layer. |
| 1785 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1786 | spin_lock_irqsave(sc->lock, flags); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1787 | sc->reset = 0; |
| 1788 | tasklet_schedule(&sc->tasklet); |
| 1789 | list_for_each(p, &sc->luns) { |
| 1790 | lun = list_entry(p, struct ub_lun, link); |
| 1791 | blk_start_queue(lun->disk->queue); |
| 1792 | } |
| 1793 | wake_up(&sc->reset_wait); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1794 | spin_unlock_irqrestore(sc->lock, flags); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1795 | } |
| 1796 | |
| 1797 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | * This is called from a process context. |
| 1799 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1800 | static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | { |
| 1802 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1803 | lun->readonly = 0; /* XXX Query this from the device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1805 | lun->capacity.nsec = 0; |
| 1806 | lun->capacity.bsize = 512; |
| 1807 | lun->capacity.bshift = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1809 | if (ub_sync_tur(sc, lun) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | return; /* Not ready */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1811 | lun->changed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1813 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | /* |
| 1815 | * The retry here means something is wrong, either with the |
| 1816 | * device, with the transport, or with our code. |
| 1817 | * We keep this because sd.c has retries for capacity. |
| 1818 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1819 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
| 1820 | lun->capacity.nsec = 0; |
| 1821 | lun->capacity.bsize = 512; |
| 1822 | lun->capacity.bshift = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | } |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | /* |
| 1828 | * The open funcion. |
| 1829 | * This is mostly needed to keep refcounting, but also to support |
| 1830 | * media checks on removable media drives. |
| 1831 | */ |
| 1832 | static int ub_bd_open(struct inode *inode, struct file *filp) |
| 1833 | { |
| 1834 | struct gendisk *disk = inode->i_bdev->bd_disk; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1835 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | struct ub_dev *sc; |
| 1837 | unsigned long flags; |
| 1838 | int rc; |
| 1839 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1840 | if ((lun = disk->private_data) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | return -ENXIO; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1842 | sc = lun->udev; |
| 1843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | spin_lock_irqsave(&ub_lock, flags); |
| 1845 | if (atomic_read(&sc->poison)) { |
| 1846 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1847 | return -ENXIO; |
| 1848 | } |
| 1849 | sc->openc++; |
| 1850 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1851 | |
| 1852 | /* |
| 1853 | * This is a workaround for a specific problem in our block layer. |
| 1854 | * In 2.6.9, register_disk duplicates the code from rescan_partitions. |
| 1855 | * However, if we do add_disk with a device which persistently reports |
| 1856 | * a changed media, add_disk calls register_disk, which does do_open, |
| 1857 | * which will call rescan_paritions for changed media. After that, |
| 1858 | * register_disk attempts to do it all again and causes double kobject |
| 1859 | * registration and a eventually an oops on module removal. |
| 1860 | * |
| 1861 | * The bottom line is, Al Viro says that we should not allow |
| 1862 | * bdev->bd_invalidated to be set when doing add_disk no matter what. |
| 1863 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1864 | if (lun->first_open) { |
| 1865 | lun->first_open = 0; |
| 1866 | if (lun->changed) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | rc = -ENOMEDIUM; |
| 1868 | goto err_open; |
| 1869 | } |
| 1870 | } |
| 1871 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1872 | if (lun->removable || lun->readonly) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | check_disk_change(inode->i_bdev); |
| 1874 | |
| 1875 | /* |
| 1876 | * The sd.c considers ->media_present and ->changed not equivalent, |
| 1877 | * under some pretty murky conditions (a failure of READ CAPACITY). |
| 1878 | * We may need it one day. |
| 1879 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1880 | if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | rc = -ENOMEDIUM; |
| 1882 | goto err_open; |
| 1883 | } |
| 1884 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1885 | if (lun->readonly && (filp->f_mode & FMODE_WRITE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | rc = -EROFS; |
| 1887 | goto err_open; |
| 1888 | } |
| 1889 | |
| 1890 | return 0; |
| 1891 | |
| 1892 | err_open: |
| 1893 | ub_put(sc); |
| 1894 | return rc; |
| 1895 | } |
| 1896 | |
| 1897 | /* |
| 1898 | */ |
| 1899 | static int ub_bd_release(struct inode *inode, struct file *filp) |
| 1900 | { |
| 1901 | struct gendisk *disk = inode->i_bdev->bd_disk; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1902 | struct ub_lun *lun = disk->private_data; |
| 1903 | struct ub_dev *sc = lun->udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | |
| 1905 | ub_put(sc); |
| 1906 | return 0; |
| 1907 | } |
| 1908 | |
| 1909 | /* |
| 1910 | * The ioctl interface. |
| 1911 | */ |
| 1912 | static int ub_bd_ioctl(struct inode *inode, struct file *filp, |
| 1913 | unsigned int cmd, unsigned long arg) |
| 1914 | { |
| 1915 | struct gendisk *disk = inode->i_bdev->bd_disk; |
| 1916 | void __user *usermem = (void __user *) arg; |
| 1917 | |
| 1918 | return scsi_cmd_ioctl(filp, disk, cmd, usermem); |
| 1919 | } |
| 1920 | |
| 1921 | /* |
| 1922 | * This is called once a new disk was seen by the block layer or by ub_probe(). |
| 1923 | * The main onjective here is to discover the features of the media such as |
| 1924 | * the capacity, read-only status, etc. USB storage generally does not |
| 1925 | * need to be spun up, but if we needed it, this would be the place. |
| 1926 | * |
| 1927 | * This call can sleep. |
| 1928 | * |
| 1929 | * The return code is not used. |
| 1930 | */ |
| 1931 | static int ub_bd_revalidate(struct gendisk *disk) |
| 1932 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1933 | struct ub_lun *lun = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1935 | ub_revalidate(lun->udev, lun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | |
| 1937 | /* XXX Support sector size switching like in sr.c */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1938 | blk_queue_hardsect_size(disk->queue, lun->capacity.bsize); |
| 1939 | set_capacity(disk, lun->capacity.nsec); |
| 1940 | // set_disk_ro(sdkp->disk, lun->readonly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
| 1942 | return 0; |
| 1943 | } |
| 1944 | |
| 1945 | /* |
| 1946 | * The check is called by the block layer to verify if the media |
| 1947 | * is still available. It is supposed to be harmless, lightweight and |
| 1948 | * non-intrusive in case the media was not changed. |
| 1949 | * |
| 1950 | * This call can sleep. |
| 1951 | * |
| 1952 | * The return code is bool! |
| 1953 | */ |
| 1954 | static int ub_bd_media_changed(struct gendisk *disk) |
| 1955 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1956 | struct ub_lun *lun = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1958 | if (!lun->removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | return 0; |
| 1960 | |
| 1961 | /* |
| 1962 | * We clean checks always after every command, so this is not |
| 1963 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, |
| 1964 | * the device is actually not ready with operator or software |
| 1965 | * intervention required. One dangerous item might be a drive which |
| 1966 | * spins itself down, and come the time to write dirty pages, this |
| 1967 | * will fail, then block layer discards the data. Since we never |
| 1968 | * spin drives up, such devices simply cannot be used with ub anyway. |
| 1969 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1970 | if (ub_sync_tur(lun->udev, lun) != 0) { |
| 1971 | lun->changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | return 1; |
| 1973 | } |
| 1974 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1975 | return lun->changed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | } |
| 1977 | |
| 1978 | static struct block_device_operations ub_bd_fops = { |
| 1979 | .owner = THIS_MODULE, |
| 1980 | .open = ub_bd_open, |
| 1981 | .release = ub_bd_release, |
| 1982 | .ioctl = ub_bd_ioctl, |
| 1983 | .media_changed = ub_bd_media_changed, |
| 1984 | .revalidate_disk = ub_bd_revalidate, |
| 1985 | }; |
| 1986 | |
| 1987 | /* |
| 1988 | * Common ->done routine for commands executed synchronously. |
| 1989 | */ |
| 1990 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1991 | { |
| 1992 | struct completion *cop = cmd->back; |
| 1993 | complete(cop); |
| 1994 | } |
| 1995 | |
| 1996 | /* |
| 1997 | * Test if the device has a check condition on it, synchronously. |
| 1998 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1999 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | { |
| 2001 | struct ub_scsi_cmd *cmd; |
| 2002 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; |
| 2003 | unsigned long flags; |
| 2004 | struct completion compl; |
| 2005 | int rc; |
| 2006 | |
| 2007 | init_completion(&compl); |
| 2008 | |
| 2009 | rc = -ENOMEM; |
| 2010 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
| 2011 | goto err_alloc; |
| 2012 | memset(cmd, 0, ALLOC_SIZE); |
| 2013 | |
| 2014 | cmd->cdb[0] = TEST_UNIT_READY; |
| 2015 | cmd->cdb_len = 6; |
| 2016 | cmd->dir = UB_DIR_NONE; |
| 2017 | cmd->state = UB_CMDST_INIT; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2018 | cmd->lun = lun; /* This may be NULL, but that's ok */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | cmd->done = ub_probe_done; |
| 2020 | cmd->back = &compl; |
| 2021 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2022 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | cmd->tag = sc->tagcnt++; |
| 2024 | |
| 2025 | rc = ub_submit_scsi(sc, cmd); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2026 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | |
| 2028 | if (rc != 0) { |
| 2029 | printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */ |
| 2030 | goto err_submit; |
| 2031 | } |
| 2032 | |
| 2033 | wait_for_completion(&compl); |
| 2034 | |
| 2035 | rc = cmd->error; |
| 2036 | |
| 2037 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ |
| 2038 | rc = cmd->key; |
| 2039 | |
| 2040 | err_submit: |
| 2041 | kfree(cmd); |
| 2042 | err_alloc: |
| 2043 | return rc; |
| 2044 | } |
| 2045 | |
| 2046 | /* |
| 2047 | * Read the SCSI capacity synchronously (for probing). |
| 2048 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2049 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
| 2050 | struct ub_capacity *ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | { |
| 2052 | struct ub_scsi_cmd *cmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 2053 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | char *p; |
| 2055 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; |
| 2056 | unsigned long flags; |
| 2057 | unsigned int bsize, shift; |
| 2058 | unsigned long nsec; |
| 2059 | struct completion compl; |
| 2060 | int rc; |
| 2061 | |
| 2062 | init_completion(&compl); |
| 2063 | |
| 2064 | rc = -ENOMEM; |
| 2065 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
| 2066 | goto err_alloc; |
| 2067 | memset(cmd, 0, ALLOC_SIZE); |
| 2068 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); |
| 2069 | |
| 2070 | cmd->cdb[0] = 0x25; |
| 2071 | cmd->cdb_len = 10; |
| 2072 | cmd->dir = UB_DIR_READ; |
| 2073 | cmd->state = UB_CMDST_INIT; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 2074 | cmd->nsg = 1; |
| 2075 | sg = &cmd->sgv[0]; |
| 2076 | sg->page = virt_to_page(p); |
Pete Zaitcev | 38ffdd6 | 2005-09-24 13:10:16 -0700 | [diff] [blame] | 2077 | sg->offset = (unsigned long)p & (PAGE_SIZE-1); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 2078 | sg->length = 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | cmd->len = 8; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2080 | cmd->lun = lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | cmd->done = ub_probe_done; |
| 2082 | cmd->back = &compl; |
| 2083 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2084 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | cmd->tag = sc->tagcnt++; |
| 2086 | |
| 2087 | rc = ub_submit_scsi(sc, cmd); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2088 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
| 2090 | if (rc != 0) { |
| 2091 | printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */ |
| 2092 | goto err_submit; |
| 2093 | } |
| 2094 | |
| 2095 | wait_for_completion(&compl); |
| 2096 | |
| 2097 | if (cmd->error != 0) { |
| 2098 | printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */ |
| 2099 | rc = -EIO; |
| 2100 | goto err_read; |
| 2101 | } |
| 2102 | if (cmd->act_len != 8) { |
| 2103 | printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */ |
| 2104 | rc = -EIO; |
| 2105 | goto err_read; |
| 2106 | } |
| 2107 | |
| 2108 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ |
| 2109 | nsec = be32_to_cpu(*(__be32 *)p) + 1; |
| 2110 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); |
| 2111 | switch (bsize) { |
| 2112 | case 512: shift = 0; break; |
| 2113 | case 1024: shift = 1; break; |
| 2114 | case 2048: shift = 2; break; |
| 2115 | case 4096: shift = 3; break; |
| 2116 | default: |
| 2117 | printk("ub: Bad sector size %u\n", bsize); /* P3 */ |
| 2118 | rc = -EDOM; |
| 2119 | goto err_inv_bsize; |
| 2120 | } |
| 2121 | |
| 2122 | ret->bsize = bsize; |
| 2123 | ret->bshift = shift; |
| 2124 | ret->nsec = nsec << shift; |
| 2125 | rc = 0; |
| 2126 | |
| 2127 | err_inv_bsize: |
| 2128 | err_read: |
| 2129 | err_submit: |
| 2130 | kfree(cmd); |
| 2131 | err_alloc: |
| 2132 | return rc; |
| 2133 | } |
| 2134 | |
| 2135 | /* |
| 2136 | */ |
| 2137 | static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt) |
| 2138 | { |
| 2139 | struct completion *cop = urb->context; |
| 2140 | complete(cop); |
| 2141 | } |
| 2142 | |
| 2143 | static void ub_probe_timeout(unsigned long arg) |
| 2144 | { |
| 2145 | struct completion *cop = (struct completion *) arg; |
| 2146 | complete(cop); |
| 2147 | } |
| 2148 | |
| 2149 | /* |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame^] | 2150 | * Reset with a Bulk reset. |
| 2151 | */ |
| 2152 | static int ub_sync_reset(struct ub_dev *sc) |
| 2153 | { |
| 2154 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; |
| 2155 | struct usb_ctrlrequest *cr; |
| 2156 | struct completion compl; |
| 2157 | struct timer_list timer; |
| 2158 | int rc; |
| 2159 | |
| 2160 | init_completion(&compl); |
| 2161 | |
| 2162 | cr = &sc->work_cr; |
| 2163 | cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE; |
| 2164 | cr->bRequest = US_BULK_RESET_REQUEST; |
| 2165 | cr->wValue = cpu_to_le16(0); |
| 2166 | cr->wIndex = cpu_to_le16(ifnum); |
| 2167 | cr->wLength = cpu_to_le16(0); |
| 2168 | |
| 2169 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 2170 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); |
| 2171 | sc->work_urb.actual_length = 0; |
| 2172 | sc->work_urb.error_count = 0; |
| 2173 | sc->work_urb.status = 0; |
| 2174 | |
| 2175 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { |
| 2176 | printk(KERN_WARNING |
| 2177 | "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc); |
| 2178 | return rc; |
| 2179 | } |
| 2180 | |
| 2181 | init_timer(&timer); |
| 2182 | timer.function = ub_probe_timeout; |
| 2183 | timer.data = (unsigned long) &compl; |
| 2184 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 2185 | add_timer(&timer); |
| 2186 | |
| 2187 | wait_for_completion(&compl); |
| 2188 | |
| 2189 | del_timer_sync(&timer); |
| 2190 | usb_kill_urb(&sc->work_urb); |
| 2191 | |
| 2192 | return sc->work_urb.status; |
| 2193 | } |
| 2194 | |
| 2195 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2196 | * Get number of LUNs by the way of Bulk GetMaxLUN command. |
| 2197 | */ |
| 2198 | static int ub_sync_getmaxlun(struct ub_dev *sc) |
| 2199 | { |
| 2200 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; |
| 2201 | unsigned char *p; |
| 2202 | enum { ALLOC_SIZE = 1 }; |
| 2203 | struct usb_ctrlrequest *cr; |
| 2204 | struct completion compl; |
| 2205 | struct timer_list timer; |
| 2206 | int nluns; |
| 2207 | int rc; |
| 2208 | |
| 2209 | init_completion(&compl); |
| 2210 | |
| 2211 | rc = -ENOMEM; |
| 2212 | if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
| 2213 | goto err_alloc; |
| 2214 | *p = 55; |
| 2215 | |
| 2216 | cr = &sc->work_cr; |
| 2217 | cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; |
| 2218 | cr->bRequest = US_BULK_GET_MAX_LUN; |
| 2219 | cr->wValue = cpu_to_le16(0); |
| 2220 | cr->wIndex = cpu_to_le16(ifnum); |
| 2221 | cr->wLength = cpu_to_le16(1); |
| 2222 | |
| 2223 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, |
| 2224 | (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2225 | sc->work_urb.actual_length = 0; |
| 2226 | sc->work_urb.error_count = 0; |
| 2227 | sc->work_urb.status = 0; |
| 2228 | |
| 2229 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { |
| 2230 | if (rc == -EPIPE) { |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2231 | printk("%s: Stall submitting GetMaxLUN, using 1 LUN\n", |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2232 | sc->name); /* P3 */ |
| 2233 | } else { |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2234 | printk(KERN_NOTICE |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2235 | "%s: Unable to submit GetMaxLUN (%d)\n", |
| 2236 | sc->name, rc); |
| 2237 | } |
| 2238 | goto err_submit; |
| 2239 | } |
| 2240 | |
| 2241 | init_timer(&timer); |
| 2242 | timer.function = ub_probe_timeout; |
| 2243 | timer.data = (unsigned long) &compl; |
| 2244 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 2245 | add_timer(&timer); |
| 2246 | |
| 2247 | wait_for_completion(&compl); |
| 2248 | |
| 2249 | del_timer_sync(&timer); |
| 2250 | usb_kill_urb(&sc->work_urb); |
| 2251 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2252 | if ((rc = sc->work_urb.status) < 0) { |
| 2253 | if (rc == -EPIPE) { |
| 2254 | printk("%s: Stall at GetMaxLUN, using 1 LUN\n", |
| 2255 | sc->name); /* P3 */ |
| 2256 | } else { |
| 2257 | printk(KERN_NOTICE |
| 2258 | "%s: Error at GetMaxLUN (%d)\n", |
| 2259 | sc->name, rc); |
| 2260 | } |
| 2261 | goto err_io; |
| 2262 | } |
| 2263 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2264 | if (sc->work_urb.actual_length != 1) { |
| 2265 | printk("%s: GetMaxLUN returned %d bytes\n", sc->name, |
| 2266 | sc->work_urb.actual_length); /* P3 */ |
| 2267 | nluns = 0; |
| 2268 | } else { |
| 2269 | if ((nluns = *p) == 55) { |
| 2270 | nluns = 0; |
| 2271 | } else { |
| 2272 | /* GetMaxLUN returns the maximum LUN number */ |
| 2273 | nluns += 1; |
| 2274 | if (nluns > UB_MAX_LUNS) |
| 2275 | nluns = UB_MAX_LUNS; |
| 2276 | } |
| 2277 | printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name, |
| 2278 | *p, nluns); /* P3 */ |
| 2279 | } |
| 2280 | |
| 2281 | kfree(p); |
| 2282 | return nluns; |
| 2283 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2284 | err_io: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2285 | err_submit: |
| 2286 | kfree(p); |
| 2287 | err_alloc: |
| 2288 | return rc; |
| 2289 | } |
| 2290 | |
| 2291 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | * Clear initial stalls. |
| 2293 | */ |
| 2294 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) |
| 2295 | { |
| 2296 | int endp; |
| 2297 | struct usb_ctrlrequest *cr; |
| 2298 | struct completion compl; |
| 2299 | struct timer_list timer; |
| 2300 | int rc; |
| 2301 | |
| 2302 | init_completion(&compl); |
| 2303 | |
| 2304 | endp = usb_pipeendpoint(stalled_pipe); |
| 2305 | if (usb_pipein (stalled_pipe)) |
| 2306 | endp |= USB_DIR_IN; |
| 2307 | |
| 2308 | cr = &sc->work_cr; |
| 2309 | cr->bRequestType = USB_RECIP_ENDPOINT; |
| 2310 | cr->bRequest = USB_REQ_CLEAR_FEATURE; |
| 2311 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); |
| 2312 | cr->wIndex = cpu_to_le16(endp); |
| 2313 | cr->wLength = cpu_to_le16(0); |
| 2314 | |
| 2315 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 2316 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | sc->work_urb.actual_length = 0; |
| 2318 | sc->work_urb.error_count = 0; |
| 2319 | sc->work_urb.status = 0; |
| 2320 | |
| 2321 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { |
| 2322 | printk(KERN_WARNING |
| 2323 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); |
| 2324 | return rc; |
| 2325 | } |
| 2326 | |
| 2327 | init_timer(&timer); |
| 2328 | timer.function = ub_probe_timeout; |
| 2329 | timer.data = (unsigned long) &compl; |
| 2330 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 2331 | add_timer(&timer); |
| 2332 | |
| 2333 | wait_for_completion(&compl); |
| 2334 | |
| 2335 | del_timer_sync(&timer); |
| 2336 | usb_kill_urb(&sc->work_urb); |
| 2337 | |
| 2338 | /* reset the endpoint toggle */ |
| 2339 | usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0); |
| 2340 | |
| 2341 | return 0; |
| 2342 | } |
| 2343 | |
| 2344 | /* |
| 2345 | * Get the pipe settings. |
| 2346 | */ |
| 2347 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, |
| 2348 | struct usb_interface *intf) |
| 2349 | { |
| 2350 | struct usb_host_interface *altsetting = intf->cur_altsetting; |
| 2351 | struct usb_endpoint_descriptor *ep_in = NULL; |
| 2352 | struct usb_endpoint_descriptor *ep_out = NULL; |
| 2353 | struct usb_endpoint_descriptor *ep; |
| 2354 | int i; |
| 2355 | |
| 2356 | /* |
| 2357 | * Find the endpoints we need. |
| 2358 | * We are expecting a minimum of 2 endpoints - in and out (bulk). |
| 2359 | * We will ignore any others. |
| 2360 | */ |
| 2361 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { |
| 2362 | ep = &altsetting->endpoint[i].desc; |
| 2363 | |
| 2364 | /* Is it a BULK endpoint? */ |
| 2365 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| 2366 | == USB_ENDPOINT_XFER_BULK) { |
| 2367 | /* BULK in or out? */ |
| 2368 | if (ep->bEndpointAddress & USB_DIR_IN) |
| 2369 | ep_in = ep; |
| 2370 | else |
| 2371 | ep_out = ep; |
| 2372 | } |
| 2373 | } |
| 2374 | |
| 2375 | if (ep_in == NULL || ep_out == NULL) { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2376 | printk(KERN_NOTICE "%s: failed endpoint check\n", |
| 2377 | sc->name); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2378 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | } |
| 2380 | |
| 2381 | /* Calculate and store the pipe values */ |
| 2382 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); |
| 2383 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); |
| 2384 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, |
| 2385 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 2386 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, |
| 2387 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); |
| 2388 | |
| 2389 | return 0; |
| 2390 | } |
| 2391 | |
| 2392 | /* |
| 2393 | * Probing is done in the process context, which allows us to cheat |
| 2394 | * and not to build a state machine for the discovery. |
| 2395 | */ |
| 2396 | static int ub_probe(struct usb_interface *intf, |
| 2397 | const struct usb_device_id *dev_id) |
| 2398 | { |
| 2399 | struct ub_dev *sc; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2400 | int nluns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | int rc; |
| 2402 | int i; |
| 2403 | |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2404 | if (usb_usual_check_type(dev_id, USB_US_TYPE_UB)) |
| 2405 | return -ENXIO; |
| 2406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | rc = -ENOMEM; |
| 2408 | if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) |
| 2409 | goto err_core; |
| 2410 | memset(sc, 0, sizeof(struct ub_dev)); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2411 | sc->lock = ub_next_lock(); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2412 | INIT_LIST_HEAD(&sc->luns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | usb_init_urb(&sc->work_urb); |
| 2414 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); |
| 2415 | atomic_set(&sc->poison, 0); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2416 | INIT_WORK(&sc->reset_work, ub_reset_task, sc); |
| 2417 | init_waitqueue_head(&sc->reset_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2418 | |
| 2419 | init_timer(&sc->work_timer); |
| 2420 | sc->work_timer.data = (unsigned long) sc; |
| 2421 | sc->work_timer.function = ub_urb_timeout; |
| 2422 | |
| 2423 | ub_init_completion(&sc->work_done); |
| 2424 | sc->work_done.done = 1; /* A little yuk, but oh well... */ |
| 2425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | sc->dev = interface_to_usbdev(intf); |
| 2427 | sc->intf = intf; |
| 2428 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | usb_set_intfdata(intf, sc); |
| 2430 | usb_get_dev(sc->dev); |
| 2431 | // usb_get_intf(sc->intf); /* Do we need this? */ |
| 2432 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2433 | snprintf(sc->name, 12, DRV_NAME "(%d.%d)", |
| 2434 | sc->dev->bus->busnum, sc->dev->devnum); |
| 2435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | /* XXX Verify that we can handle the device (from descriptors) */ |
| 2437 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2438 | if (ub_get_pipes(sc, sc->dev, intf) != 0) |
| 2439 | goto err_dev_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
| 2441 | if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0) |
| 2442 | goto err_diag; |
| 2443 | |
| 2444 | /* |
| 2445 | * At this point, all USB initialization is done, do upper layer. |
| 2446 | * We really hate halfway initialized structures, so from the |
| 2447 | * invariants perspective, this ub_dev is fully constructed at |
| 2448 | * this point. |
| 2449 | */ |
| 2450 | |
| 2451 | /* |
| 2452 | * This is needed to clear toggles. It is a problem only if we do |
| 2453 | * `rmmod ub && modprobe ub` without disconnects, but we like that. |
| 2454 | */ |
Pete Zaitcev | c6c8883 | 2005-09-22 00:49:45 -0700 | [diff] [blame] | 2455 | #if 0 /* iPod Mini fails if we do this (big white iPod works) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
| 2457 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); |
Pete Zaitcev | c6c8883 | 2005-09-22 00:49:45 -0700 | [diff] [blame] | 2458 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2459 | |
| 2460 | /* |
| 2461 | * The way this is used by the startup code is a little specific. |
| 2462 | * A SCSI check causes a USB stall. Our common case code sees it |
| 2463 | * and clears the check, after which the device is ready for use. |
| 2464 | * But if a check was not present, any command other than |
| 2465 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). |
| 2466 | * |
| 2467 | * If we neglect to clear the SCSI check, the first real command fails |
| 2468 | * (which is the capacity readout). We clear that and retry, but why |
| 2469 | * causing spurious retries for no reason. |
| 2470 | * |
| 2471 | * Revalidation may start with its own TEST_UNIT_READY, but that one |
| 2472 | * has to succeed, so we clear checks with an additional one here. |
| 2473 | * In any case it's not our business how revaliadation is implemented. |
| 2474 | */ |
| 2475 | for (i = 0; i < 3; i++) { /* Retries for benh's key */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2476 | if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | if (rc != 0x6) break; |
| 2478 | msleep(10); |
| 2479 | } |
| 2480 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2481 | nluns = 1; |
| 2482 | for (i = 0; i < 3; i++) { |
| 2483 | if ((rc = ub_sync_getmaxlun(sc)) < 0) { |
| 2484 | /* |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2485 | * This segment is taken from usb-storage. They say |
| 2486 | * that ZIP-100 needs this, but my own ZIP-100 works |
| 2487 | * fine without this. |
| 2488 | * Still, it does not seem to hurt anything. |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2489 | */ |
| 2490 | if (rc == -EPIPE) { |
| 2491 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
| 2492 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); |
| 2493 | } |
| 2494 | break; |
| 2495 | } |
| 2496 | if (rc != 0) { |
| 2497 | nluns = rc; |
| 2498 | break; |
| 2499 | } |
Pete Zaitcev | 9f793d2 | 2005-06-06 13:54:59 -0700 | [diff] [blame] | 2500 | msleep(100); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2501 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2503 | for (i = 0; i < nluns; i++) { |
| 2504 | ub_probe_lun(sc, i); |
| 2505 | } |
| 2506 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2507 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2508 | /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */ |
| 2509 | err_diag: |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2510 | err_dev_desc: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2511 | usb_set_intfdata(intf, NULL); |
| 2512 | // usb_put_intf(sc->intf); |
| 2513 | usb_put_dev(sc->dev); |
| 2514 | kfree(sc); |
| 2515 | err_core: |
| 2516 | return rc; |
| 2517 | } |
| 2518 | |
| 2519 | static int ub_probe_lun(struct ub_dev *sc, int lnum) |
| 2520 | { |
| 2521 | struct ub_lun *lun; |
| 2522 | request_queue_t *q; |
| 2523 | struct gendisk *disk; |
| 2524 | int rc; |
| 2525 | |
| 2526 | rc = -ENOMEM; |
| 2527 | if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) |
| 2528 | goto err_alloc; |
| 2529 | memset(lun, 0, sizeof(struct ub_lun)); |
| 2530 | lun->num = lnum; |
| 2531 | |
| 2532 | rc = -ENOSR; |
| 2533 | if ((lun->id = ub_id_get()) == -1) |
| 2534 | goto err_id; |
| 2535 | |
| 2536 | lun->udev = sc; |
| 2537 | list_add(&lun->link, &sc->luns); |
| 2538 | |
| 2539 | snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", |
| 2540 | lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); |
| 2541 | |
| 2542 | lun->removable = 1; /* XXX Query this from the device */ |
| 2543 | lun->changed = 1; /* ub_revalidate clears only */ |
| 2544 | lun->first_open = 1; |
| 2545 | ub_revalidate(sc, lun); |
| 2546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2547 | rc = -ENOMEM; |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 2548 | if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2549 | goto err_diskalloc; |
| 2550 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2551 | lun->disk = disk; |
| 2552 | sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); |
| 2553 | sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | disk->major = UB_MAJOR; |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 2555 | disk->first_minor = lun->id * UB_PARTS_PER_LUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | disk->fops = &ub_bd_fops; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2557 | disk->private_data = lun; |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2558 | disk->driverfs_dev = &sc->intf->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | |
| 2560 | rc = -ENOMEM; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2561 | if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2562 | goto err_blkqinit; |
| 2563 | |
| 2564 | disk->queue = q; |
| 2565 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2566 | blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2567 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); |
| 2568 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2569 | blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2570 | blk_queue_max_sectors(q, UB_MAX_SECTORS); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2571 | blk_queue_hardsect_size(q, lun->capacity.bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2573 | q->queuedata = lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2575 | set_capacity(disk, lun->capacity.nsec); |
| 2576 | if (lun->removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | disk->flags |= GENHD_FL_REMOVABLE; |
| 2578 | |
| 2579 | add_disk(disk); |
| 2580 | |
| 2581 | return 0; |
| 2582 | |
| 2583 | err_blkqinit: |
| 2584 | put_disk(disk); |
| 2585 | err_diskalloc: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2586 | list_del(&lun->link); |
| 2587 | ub_id_put(lun->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | err_id: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2589 | kfree(lun); |
| 2590 | err_alloc: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | return rc; |
| 2592 | } |
| 2593 | |
| 2594 | static void ub_disconnect(struct usb_interface *intf) |
| 2595 | { |
| 2596 | struct ub_dev *sc = usb_get_intfdata(intf); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2597 | struct list_head *p; |
| 2598 | struct ub_lun *lun; |
| 2599 | struct gendisk *disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2600 | unsigned long flags; |
| 2601 | |
| 2602 | /* |
| 2603 | * Prevent ub_bd_release from pulling the rug from under us. |
| 2604 | * XXX This is starting to look like a kref. |
| 2605 | * XXX Why not to take this ref at probe time? |
| 2606 | */ |
| 2607 | spin_lock_irqsave(&ub_lock, flags); |
| 2608 | sc->openc++; |
| 2609 | spin_unlock_irqrestore(&ub_lock, flags); |
| 2610 | |
| 2611 | /* |
| 2612 | * Fence stall clearnings, operations triggered by unlinkings and so on. |
| 2613 | * We do not attempt to unlink any URBs, because we do not trust the |
| 2614 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. |
| 2615 | */ |
| 2616 | atomic_set(&sc->poison, 1); |
| 2617 | |
| 2618 | /* |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2619 | * Wait for reset to end, if any. |
| 2620 | */ |
| 2621 | wait_event(sc->reset_wait, !sc->reset); |
| 2622 | |
| 2623 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | * Blow away queued commands. |
| 2625 | * |
| 2626 | * Actually, this never works, because before we get here |
| 2627 | * the HCD terminates outstanding URB(s). It causes our |
| 2628 | * SCSI command queue to advance, commands fail to submit, |
| 2629 | * and the whole queue drains. So, we just use this code to |
| 2630 | * print warnings. |
| 2631 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2632 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | { |
| 2634 | struct ub_scsi_cmd *cmd; |
| 2635 | int cnt = 0; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2636 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2637 | cmd->error = -ENOTCONN; |
| 2638 | cmd->state = UB_CMDST_DONE; |
| 2639 | ub_cmdtr_state(sc, cmd); |
| 2640 | ub_cmdq_pop(sc); |
| 2641 | (*cmd->done)(sc, cmd); |
| 2642 | cnt++; |
| 2643 | } |
| 2644 | if (cnt != 0) { |
| 2645 | printk(KERN_WARNING "%s: " |
| 2646 | "%d was queued after shutdown\n", sc->name, cnt); |
| 2647 | } |
| 2648 | } |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2649 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2650 | |
| 2651 | /* |
| 2652 | * Unregister the upper layer. |
| 2653 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2654 | list_for_each (p, &sc->luns) { |
| 2655 | lun = list_entry(p, struct ub_lun, link); |
| 2656 | disk = lun->disk; |
| 2657 | if (disk->flags & GENHD_FL_UP) |
| 2658 | del_gendisk(disk); |
| 2659 | /* |
| 2660 | * I wish I could do: |
| 2661 | * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); |
| 2662 | * As it is, we rely on our internal poisoning and let |
| 2663 | * the upper levels to spin furiously failing all the I/O. |
| 2664 | */ |
| 2665 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2666 | |
| 2667 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | * Testing for -EINPROGRESS is always a bug, so we are bending |
| 2669 | * the rules a little. |
| 2670 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2671 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ |
| 2673 | printk(KERN_WARNING "%s: " |
| 2674 | "URB is active after disconnect\n", sc->name); |
| 2675 | } |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2676 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | |
| 2678 | /* |
| 2679 | * There is virtually no chance that other CPU runs times so long |
| 2680 | * after ub_urb_complete should have called del_timer, but only if HCD |
| 2681 | * didn't forget to deliver a callback on unlink. |
| 2682 | */ |
| 2683 | del_timer_sync(&sc->work_timer); |
| 2684 | |
| 2685 | /* |
| 2686 | * At this point there must be no commands coming from anyone |
| 2687 | * and no URBs left in transit. |
| 2688 | */ |
| 2689 | |
| 2690 | device_remove_file(&sc->intf->dev, &dev_attr_diag); |
| 2691 | usb_set_intfdata(intf, NULL); |
| 2692 | // usb_put_intf(sc->intf); |
| 2693 | sc->intf = NULL; |
| 2694 | usb_put_dev(sc->dev); |
| 2695 | sc->dev = NULL; |
| 2696 | |
| 2697 | ub_put(sc); |
| 2698 | } |
| 2699 | |
| 2700 | static struct usb_driver ub_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | .name = "ub", |
| 2702 | .probe = ub_probe, |
| 2703 | .disconnect = ub_disconnect, |
| 2704 | .id_table = ub_usb_ids, |
| 2705 | }; |
| 2706 | |
| 2707 | static int __init ub_init(void) |
| 2708 | { |
| 2709 | int rc; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2710 | int i; |
| 2711 | |
| 2712 | for (i = 0; i < UB_QLOCK_NUM; i++) |
| 2713 | spin_lock_init(&ub_qlockv[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) |
| 2716 | goto err_regblkdev; |
| 2717 | devfs_mk_dir(DEVFS_NAME); |
| 2718 | |
| 2719 | if ((rc = usb_register(&ub_driver)) != 0) |
| 2720 | goto err_register; |
| 2721 | |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2722 | usb_usual_set_present(USB_US_TYPE_UB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | return 0; |
| 2724 | |
| 2725 | err_register: |
| 2726 | devfs_remove(DEVFS_NAME); |
| 2727 | unregister_blkdev(UB_MAJOR, DRV_NAME); |
| 2728 | err_regblkdev: |
| 2729 | return rc; |
| 2730 | } |
| 2731 | |
| 2732 | static void __exit ub_exit(void) |
| 2733 | { |
| 2734 | usb_deregister(&ub_driver); |
| 2735 | |
| 2736 | devfs_remove(DEVFS_NAME); |
| 2737 | unregister_blkdev(UB_MAJOR, DRV_NAME); |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2738 | usb_usual_clear_present(USB_US_TYPE_UB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2739 | } |
| 2740 | |
| 2741 | module_init(ub_init); |
| 2742 | module_exit(ub_exit); |
| 2743 | |
| 2744 | MODULE_LICENSE("GPL"); |