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 | ef45cb6 | 2008-04-08 17:41:51 -0700 | [diff] [blame] | 11 | * -- Return sense now that rq allows it (we always auto-sense anyway). |
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 | * -- verify the 13 conditions and do bulk resets |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 15 | * -- highmem |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * -- move top_sense and work_bcs into separate allocations (if they survive) |
| 17 | * for cache purists and esoteric architectures. |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 18 | * -- 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] | 19 | * -- prune comments, they are too volumnous |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * -- Resove XXX's |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 21 | * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/usb.h> |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 26 | #include <linux/usb_usual.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/blkdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/timer.h> |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 29 | #include <linux/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <scsi/scsi.h> |
| 31 | |
| 32 | #define DRV_NAME "ub" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #define UB_MAJOR 180 |
| 35 | |
| 36 | /* |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 37 | * The command state machine is the key model for understanding of this driver. |
| 38 | * |
| 39 | * The general rule is that all transitions are done towards the bottom |
| 40 | * of the diagram, thus preventing any loops. |
| 41 | * |
| 42 | * An exception to that is how the STAT state is handled. A counter allows it |
| 43 | * to be re-entered along the path marked with [C]. |
| 44 | * |
| 45 | * +--------+ |
| 46 | * ! INIT ! |
| 47 | * +--------+ |
| 48 | * ! |
| 49 | * ub_scsi_cmd_start fails ->--------------------------------------\ |
| 50 | * ! ! |
| 51 | * V ! |
| 52 | * +--------+ ! |
| 53 | * ! CMD ! ! |
| 54 | * +--------+ ! |
| 55 | * ! +--------+ ! |
| 56 | * was -EPIPE -->-------------------------------->! CLEAR ! ! |
| 57 | * ! +--------+ ! |
| 58 | * ! ! ! |
| 59 | * was error -->------------------------------------- ! --------->\ |
| 60 | * ! ! ! |
| 61 | * /--<-- cmd->dir == NONE ? ! ! |
| 62 | * ! ! ! ! |
| 63 | * ! V ! ! |
| 64 | * ! +--------+ ! ! |
| 65 | * ! ! DATA ! ! ! |
| 66 | * ! +--------+ ! ! |
| 67 | * ! ! +---------+ ! ! |
| 68 | * ! was -EPIPE -->--------------->! CLR2STS ! ! ! |
| 69 | * ! ! +---------+ ! ! |
| 70 | * ! ! ! ! ! |
| 71 | * ! ! was error -->---- ! --------->\ |
| 72 | * ! was error -->--------------------- ! ------------- ! --------->\ |
| 73 | * ! ! ! ! ! |
| 74 | * ! V ! ! ! |
| 75 | * \--->+--------+ ! ! ! |
| 76 | * ! STAT !<--------------------------/ ! ! |
| 77 | * /--->+--------+ ! ! |
| 78 | * ! ! ! ! |
| 79 | * [C] was -EPIPE -->-----------\ ! ! |
| 80 | * ! ! ! ! ! |
| 81 | * +<---- len == 0 ! ! ! |
| 82 | * ! ! ! ! ! |
| 83 | * ! was error -->--------------------------------------!---------->\ |
| 84 | * ! ! ! ! ! |
| 85 | * +<---- bad CSW ! ! ! |
| 86 | * +<---- bad tag ! ! ! |
| 87 | * ! ! V ! ! |
| 88 | * ! ! +--------+ ! ! |
| 89 | * ! ! ! CLRRS ! ! ! |
| 90 | * ! ! +--------+ ! ! |
| 91 | * ! ! ! ! ! |
| 92 | * \------- ! --------------------[C]--------\ ! ! |
| 93 | * ! ! ! ! |
| 94 | * cmd->error---\ +--------+ ! ! |
| 95 | * ! +--------------->! SENSE !<----------/ ! |
| 96 | * STAT_FAIL----/ +--------+ ! |
| 97 | * ! ! V |
| 98 | * ! V +--------+ |
| 99 | * \--------------------------------\--------------------->! DONE ! |
| 100 | * +--------+ |
| 101 | */ |
| 102 | |
| 103 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 104 | * This many LUNs per USB device. |
| 105 | * Every one of them takes a host, see UB_MAX_HOSTS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | */ |
Pete Zaitcev | 9f793d2 | 2005-06-06 13:54:59 -0700 | [diff] [blame] | 107 | #define UB_MAX_LUNS 9 |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 108 | |
| 109 | /* |
| 110 | */ |
| 111 | |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 112 | #define UB_PARTS_PER_LUN 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ |
| 115 | |
| 116 | #define UB_SENSE_SIZE 18 |
| 117 | |
| 118 | /* |
| 119 | */ |
| 120 | |
| 121 | /* command block wrapper */ |
| 122 | struct bulk_cb_wrap { |
| 123 | __le32 Signature; /* contains 'USBC' */ |
| 124 | u32 Tag; /* unique per command id */ |
| 125 | __le32 DataTransferLength; /* size of data */ |
| 126 | u8 Flags; /* direction in bit 0 */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 127 | u8 Lun; /* LUN */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | u8 Length; /* of of the CDB */ |
| 129 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ |
| 130 | }; |
| 131 | |
| 132 | #define US_BULK_CB_WRAP_LEN 31 |
| 133 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ |
| 134 | #define US_BULK_FLAG_IN 1 |
| 135 | #define US_BULK_FLAG_OUT 0 |
| 136 | |
| 137 | /* command status wrapper */ |
| 138 | struct bulk_cs_wrap { |
| 139 | __le32 Signature; /* should = 'USBS' */ |
| 140 | u32 Tag; /* same as original command */ |
| 141 | __le32 Residue; /* amount not transferred */ |
| 142 | u8 Status; /* see below */ |
| 143 | }; |
| 144 | |
| 145 | #define US_BULK_CS_WRAP_LEN 13 |
| 146 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | #define US_BULK_STAT_OK 0 |
| 148 | #define US_BULK_STAT_FAIL 1 |
| 149 | #define US_BULK_STAT_PHASE 2 |
| 150 | |
| 151 | /* bulk-only class specific requests */ |
| 152 | #define US_BULK_RESET_REQUEST 0xff |
| 153 | #define US_BULK_GET_MAX_LUN 0xfe |
| 154 | |
| 155 | /* |
| 156 | */ |
| 157 | struct ub_dev; |
| 158 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 159 | #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] | 160 | #define UB_MAX_SECTORS 64 |
| 161 | |
| 162 | /* |
| 163 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) |
| 164 | * even if a webcam hogs the bus, but some devices need time to spin up. |
| 165 | */ |
| 166 | #define UB_URB_TIMEOUT (HZ*2) |
| 167 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ |
| 168 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ |
| 169 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ |
| 170 | |
| 171 | /* |
| 172 | * An instance of a SCSI command in transit. |
| 173 | */ |
| 174 | #define UB_DIR_NONE 0 |
| 175 | #define UB_DIR_READ 1 |
| 176 | #define UB_DIR_ILLEGAL2 2 |
| 177 | #define UB_DIR_WRITE 3 |
| 178 | |
| 179 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ |
| 180 | (((c)==UB_DIR_READ)? 'r': 'n')) |
| 181 | |
| 182 | enum ub_scsi_cmd_state { |
| 183 | UB_CMDST_INIT, /* Initial state */ |
| 184 | UB_CMDST_CMD, /* Command submitted */ |
| 185 | UB_CMDST_DATA, /* Data phase */ |
| 186 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ |
| 187 | UB_CMDST_STAT, /* Status phase */ |
| 188 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 189 | UB_CMDST_CLRRS, /* Clearing before retrying status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | UB_CMDST_SENSE, /* Sending Request Sense */ |
| 191 | UB_CMDST_DONE /* Final state */ |
| 192 | }; |
| 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | struct ub_scsi_cmd { |
| 195 | unsigned char cdb[UB_MAX_CDB_SIZE]; |
| 196 | unsigned char cdb_len; |
| 197 | |
| 198 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | enum ub_scsi_cmd_state state; |
| 200 | unsigned int tag; |
| 201 | struct ub_scsi_cmd *next; |
| 202 | |
| 203 | int error; /* Return code - valid upon done */ |
| 204 | unsigned int act_len; /* Return size */ |
| 205 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ |
| 206 | |
| 207 | int stat_count; /* Retries getting status. */ |
Pete Zaitcev | 2c51ae7 | 2008-04-19 14:32:18 -0700 | [diff] [blame] | 208 | unsigned int timeo; /* jiffies until rq->timeout changes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | unsigned int len; /* Requested length */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 211 | unsigned int current_sg; |
| 212 | unsigned int nsg; /* sgv[nsg] */ |
| 213 | struct scatterlist sgv[UB_MAX_REQ_SG]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 215 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); |
| 217 | void *back; |
| 218 | }; |
| 219 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 220 | struct ub_request { |
| 221 | struct request *rq; |
| 222 | unsigned int current_try; |
| 223 | unsigned int nsg; /* sgv[nsg] */ |
| 224 | struct scatterlist sgv[UB_MAX_REQ_SG]; |
| 225 | }; |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | /* |
| 228 | */ |
| 229 | struct ub_capacity { |
| 230 | unsigned long nsec; /* Linux size - 512 byte sectors */ |
| 231 | unsigned int bsize; /* Linux hardsect_size */ |
| 232 | unsigned int bshift; /* Shift between 512 and hard sects */ |
| 233 | }; |
| 234 | |
| 235 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | * This is a direct take-off from linux/include/completion.h |
| 237 | * The difference is that I do not wait on this thing, just poll. |
| 238 | * When I want to wait (ub_probe), I just use the stock completion. |
| 239 | * |
| 240 | * Note that INIT_COMPLETION takes no lock. It is correct. But why |
| 241 | * in the bloody hell that thing takes struct instead of pointer to struct |
| 242 | * is quite beyond me. I just copied it from the stock completion. |
| 243 | */ |
| 244 | struct ub_completion { |
| 245 | unsigned int done; |
| 246 | spinlock_t lock; |
| 247 | }; |
| 248 | |
| 249 | static inline void ub_init_completion(struct ub_completion *x) |
| 250 | { |
| 251 | x->done = 0; |
| 252 | spin_lock_init(&x->lock); |
| 253 | } |
| 254 | |
| 255 | #define UB_INIT_COMPLETION(x) ((x).done = 0) |
| 256 | |
| 257 | static void ub_complete(struct ub_completion *x) |
| 258 | { |
| 259 | unsigned long flags; |
| 260 | |
| 261 | spin_lock_irqsave(&x->lock, flags); |
| 262 | x->done++; |
| 263 | spin_unlock_irqrestore(&x->lock, flags); |
| 264 | } |
| 265 | |
| 266 | static int ub_is_completed(struct ub_completion *x) |
| 267 | { |
| 268 | unsigned long flags; |
| 269 | int ret; |
| 270 | |
| 271 | spin_lock_irqsave(&x->lock, flags); |
| 272 | ret = x->done; |
| 273 | spin_unlock_irqrestore(&x->lock, flags); |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | */ |
| 279 | struct ub_scsi_cmd_queue { |
| 280 | int qlen, qmax; |
| 281 | struct ub_scsi_cmd *head, *tail; |
| 282 | }; |
| 283 | |
| 284 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 285 | * The block device instance (one per LUN). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 287 | struct ub_lun { |
| 288 | struct ub_dev *udev; |
| 289 | struct list_head link; |
| 290 | struct gendisk *disk; |
| 291 | int id; /* Host index */ |
| 292 | int num; /* LUN number */ |
| 293 | char name[16]; |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | int changed; /* Media was changed */ |
| 296 | int removable; |
| 297 | int readonly; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 298 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 299 | struct ub_request urq; |
| 300 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 301 | /* Use Ingo's mempool if or when we have more than one command. */ |
| 302 | /* |
| 303 | * Currently we never need more than one command for the whole device. |
| 304 | * However, giving every LUN a command is a cheap and automatic way |
| 305 | * to enforce fairness between them. |
| 306 | */ |
| 307 | int cmda[1]; |
| 308 | struct ub_scsi_cmd cmdv[1]; |
| 309 | |
| 310 | struct ub_capacity capacity; |
| 311 | }; |
| 312 | |
| 313 | /* |
| 314 | * The USB device instance. |
| 315 | */ |
| 316 | struct ub_dev { |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 317 | spinlock_t *lock; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 318 | atomic_t poison; /* The USB device is disconnected */ |
| 319 | int openc; /* protected by ub_lock! */ |
| 320 | /* kref is too implicit for our taste */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 321 | int reset; /* Reset is running */ |
Pete Zaitcev | 0da13c8 | 2008-04-19 14:42:49 -0700 | [diff] [blame] | 322 | int bad_resid; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 323 | unsigned int tagcnt; |
| 324 | char name[12]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | struct usb_device *dev; |
| 326 | struct usb_interface *intf; |
| 327 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 328 | struct list_head luns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | unsigned int send_bulk_pipe; /* cached pipe values */ |
| 331 | unsigned int recv_bulk_pipe; |
| 332 | unsigned int send_ctrl_pipe; |
| 333 | unsigned int recv_ctrl_pipe; |
| 334 | |
| 335 | struct tasklet_struct tasklet; |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | struct ub_scsi_cmd_queue cmd_queue; |
| 338 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ |
| 339 | unsigned char top_sense[UB_SENSE_SIZE]; |
| 340 | |
| 341 | struct ub_completion work_done; |
| 342 | struct urb work_urb; |
| 343 | struct timer_list work_timer; |
| 344 | int last_pipe; /* What might need clearing */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 345 | __le32 signature; /* Learned signature */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | struct bulk_cb_wrap work_bcb; |
| 347 | struct bulk_cs_wrap work_bcs; |
| 348 | struct usb_ctrlrequest work_cr; |
| 349 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 350 | struct work_struct reset_work; |
| 351 | wait_queue_head_t reset_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | }; |
| 353 | |
| 354 | /* |
| 355 | */ |
| 356 | static void ub_cleanup(struct ub_dev *sc); |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 357 | 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] | 358 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
| 359 | struct ub_scsi_cmd *cmd, struct ub_request *urq); |
| 360 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, |
| 361 | struct ub_scsi_cmd *cmd, struct ub_request *urq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 363 | static void ub_end_rq(struct request *rq, unsigned int status); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 364 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
| 365 | struct ub_request *urq, struct ub_scsi_cmd *cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 367 | static void ub_urb_complete(struct urb *urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | static void ub_scsi_action(unsigned long _dev); |
| 369 | static void ub_scsi_dispatch(struct ub_dev *sc); |
| 370 | 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] | 371 | 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] | 372 | 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] | 373 | 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] | 374 | 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] | 375 | 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] | 376 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); |
| 377 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
| 378 | int stalled_pipe); |
| 379 | 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] | 380 | static void ub_reset_enter(struct ub_dev *sc, int try); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 381 | static void ub_reset_task(struct work_struct *work); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 382 | static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun); |
| 383 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
| 384 | struct ub_capacity *ret); |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 385 | static int ub_sync_reset(struct ub_dev *sc); |
| 386 | 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] | 387 | static int ub_probe_lun(struct ub_dev *sc, int lnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | /* |
| 390 | */ |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 391 | #ifdef CONFIG_USB_LIBUSUAL |
| 392 | |
Alan Stern | e6e244b | 2009-02-12 14:47:44 -0500 | [diff] [blame] | 393 | #define ub_usb_ids usb_storage_usb_ids |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 394 | #else |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | static struct usb_device_id ub_usb_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, |
| 398 | { } |
| 399 | }; |
| 400 | |
| 401 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 402 | #endif /* CONFIG_USB_LIBUSUAL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | /* |
| 405 | * Find me a way to identify "next free minor" for add_disk(), |
| 406 | * and the array disappears the next day. However, the number of |
| 407 | * hosts has something to do with the naming and /proc/partitions. |
| 408 | * This has to be thought out in detail before changing. |
| 409 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. |
| 410 | */ |
| 411 | #define UB_MAX_HOSTS 26 |
| 412 | static char ub_hostv[UB_MAX_HOSTS]; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 413 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 414 | #define UB_QLOCK_NUM 5 |
| 415 | static spinlock_t ub_qlockv[UB_QLOCK_NUM]; |
| 416 | static int ub_qlock_next = 0; |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ |
| 419 | |
| 420 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | * The id allocator. |
| 422 | * |
| 423 | * This also stores the host for indexing by minor, which is somewhat dirty. |
| 424 | */ |
| 425 | static int ub_id_get(void) |
| 426 | { |
| 427 | unsigned long flags; |
| 428 | int i; |
| 429 | |
| 430 | spin_lock_irqsave(&ub_lock, flags); |
| 431 | for (i = 0; i < UB_MAX_HOSTS; i++) { |
| 432 | if (ub_hostv[i] == 0) { |
| 433 | ub_hostv[i] = 1; |
| 434 | spin_unlock_irqrestore(&ub_lock, flags); |
| 435 | return i; |
| 436 | } |
| 437 | } |
| 438 | spin_unlock_irqrestore(&ub_lock, flags); |
| 439 | return -1; |
| 440 | } |
| 441 | |
| 442 | static void ub_id_put(int id) |
| 443 | { |
| 444 | unsigned long flags; |
| 445 | |
| 446 | if (id < 0 || id >= UB_MAX_HOSTS) { |
| 447 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | spin_lock_irqsave(&ub_lock, flags); |
| 452 | if (ub_hostv[id] == 0) { |
| 453 | spin_unlock_irqrestore(&ub_lock, flags); |
| 454 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); |
| 455 | return; |
| 456 | } |
| 457 | ub_hostv[id] = 0; |
| 458 | spin_unlock_irqrestore(&ub_lock, flags); |
| 459 | } |
| 460 | |
| 461 | /* |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 462 | * This is necessitated by the fact that blk_cleanup_queue does not |
| 463 | * necesserily destroy the queue. Instead, it may merely decrease q->refcnt. |
| 464 | * Since our blk_init_queue() passes a spinlock common with ub_dev, |
| 465 | * we have life time issues when ub_cleanup frees ub_dev. |
| 466 | */ |
| 467 | static spinlock_t *ub_next_lock(void) |
| 468 | { |
| 469 | unsigned long flags; |
| 470 | spinlock_t *ret; |
| 471 | |
| 472 | spin_lock_irqsave(&ub_lock, flags); |
| 473 | ret = &ub_qlockv[ub_qlock_next]; |
| 474 | ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM; |
| 475 | spin_unlock_irqrestore(&ub_lock, flags); |
| 476 | return ret; |
| 477 | } |
| 478 | |
| 479 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | * Downcount for deallocation. This rides on two assumptions: |
| 481 | * - once something is poisoned, its refcount cannot grow |
| 482 | * - opens cannot happen at this time (del_gendisk was done) |
| 483 | * If the above is true, we can drop the lock, which we need for |
| 484 | * blk_cleanup_queue(): the silly thing may attempt to sleep. |
| 485 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] |
| 486 | */ |
| 487 | static void ub_put(struct ub_dev *sc) |
| 488 | { |
| 489 | unsigned long flags; |
| 490 | |
| 491 | spin_lock_irqsave(&ub_lock, flags); |
| 492 | --sc->openc; |
| 493 | if (sc->openc == 0 && atomic_read(&sc->poison)) { |
| 494 | spin_unlock_irqrestore(&ub_lock, flags); |
| 495 | ub_cleanup(sc); |
| 496 | } else { |
| 497 | spin_unlock_irqrestore(&ub_lock, flags); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Final cleanup and deallocation. |
| 503 | */ |
| 504 | static void ub_cleanup(struct ub_dev *sc) |
| 505 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 506 | struct list_head *p; |
| 507 | struct ub_lun *lun; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 508 | struct request_queue *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 510 | while (!list_empty(&sc->luns)) { |
| 511 | p = sc->luns.next; |
| 512 | lun = list_entry(p, struct ub_lun, link); |
| 513 | list_del(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 515 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ |
| 516 | if ((q = lun->disk->queue) != NULL) |
| 517 | blk_cleanup_queue(q); |
| 518 | /* |
| 519 | * If we zero disk->private_data BEFORE put_disk, we have |
| 520 | * to check for NULL all over the place in open, release, |
| 521 | * check_media and revalidate, because the block level |
| 522 | * semaphore is well inside the put_disk. |
| 523 | * But we cannot zero after the call, because *disk is gone. |
| 524 | * The sd.c is blatantly racy in this area. |
| 525 | */ |
| 526 | /* disk->private_data = NULL; */ |
| 527 | put_disk(lun->disk); |
| 528 | lun->disk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 530 | ub_id_put(lun->id); |
| 531 | kfree(lun); |
| 532 | } |
| 533 | |
Pete Zaitcev | 77ef6c4 | 2006-05-03 00:16:00 -0700 | [diff] [blame] | 534 | usb_set_intfdata(sc->intf, NULL); |
| 535 | usb_put_intf(sc->intf); |
| 536 | usb_put_dev(sc->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | kfree(sc); |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * The "command allocator". |
| 542 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 543 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | { |
| 545 | struct ub_scsi_cmd *ret; |
| 546 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 547 | if (lun->cmda[0]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return NULL; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 549 | ret = &lun->cmdv[0]; |
| 550 | lun->cmda[0] = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return ret; |
| 552 | } |
| 553 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 554 | 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] | 555 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 556 | if (cmd != &lun->cmdv[0]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 558 | lun->name, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | return; |
| 560 | } |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 561 | if (!lun->cmda[0]) { |
| 562 | printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | return; |
| 564 | } |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 565 | lun->cmda[0] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
| 567 | |
| 568 | /* |
| 569 | * The command queue. |
| 570 | */ |
| 571 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 572 | { |
| 573 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 574 | |
| 575 | if (t->qlen++ == 0) { |
| 576 | t->head = cmd; |
| 577 | t->tail = cmd; |
| 578 | } else { |
| 579 | t->tail->next = cmd; |
| 580 | t->tail = cmd; |
| 581 | } |
| 582 | |
| 583 | if (t->qlen > t->qmax) |
| 584 | t->qmax = t->qlen; |
| 585 | } |
| 586 | |
| 587 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 588 | { |
| 589 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 590 | |
| 591 | if (t->qlen++ == 0) { |
| 592 | t->head = cmd; |
| 593 | t->tail = cmd; |
| 594 | } else { |
| 595 | cmd->next = t->head; |
| 596 | t->head = cmd; |
| 597 | } |
| 598 | |
| 599 | if (t->qlen > t->qmax) |
| 600 | t->qmax = t->qlen; |
| 601 | } |
| 602 | |
| 603 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) |
| 604 | { |
| 605 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; |
| 606 | struct ub_scsi_cmd *cmd; |
| 607 | |
| 608 | if (t->qlen == 0) |
| 609 | return NULL; |
| 610 | if (--t->qlen == 0) |
| 611 | t->tail = NULL; |
| 612 | cmd = t->head; |
| 613 | t->head = cmd->next; |
| 614 | cmd->next = NULL; |
| 615 | return cmd; |
| 616 | } |
| 617 | |
| 618 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) |
| 619 | |
| 620 | /* |
| 621 | * The request function is our main entry point |
| 622 | */ |
| 623 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 624 | static void ub_request_fn(struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 626 | struct ub_lun *lun = q->queuedata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | struct request *rq; |
| 628 | |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 629 | while ((rq = blk_peek_request(q)) != NULL) { |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 630 | if (ub_request_fn_1(lun, rq) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | blk_stop_queue(q); |
| 632 | break; |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | |
Pete Zaitcev | 6c1eb8c | 2005-07-30 22:51:52 -0700 | [diff] [blame] | 637 | 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] | 638 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 639 | struct ub_dev *sc = lun->udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | struct ub_scsi_cmd *cmd; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 641 | struct ub_request *urq; |
| 642 | int n_elem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 644 | if (atomic_read(&sc->poison)) { |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 645 | blk_start_request(rq); |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 646 | ub_end_rq(rq, DID_NO_CONNECT << 16); |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | if (lun->changed && !blk_pc_request(rq)) { |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 651 | blk_start_request(rq); |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 652 | ub_end_rq(rq, SAM_STAT_CHECK_CONDITION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | return 0; |
| 654 | } |
| 655 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 656 | if (lun->urq.rq != NULL) |
| 657 | return -1; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 658 | if ((cmd = ub_get_cmd(lun)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | return -1; |
| 660 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); |
| 661 | |
Tejun Heo | 9934c8c | 2009-05-08 11:54:16 +0900 | [diff] [blame] | 662 | blk_start_request(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 664 | urq = &lun->urq; |
| 665 | memset(urq, 0, sizeof(struct ub_request)); |
| 666 | urq->rq = rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | /* |
| 669 | * get scatterlist from block layer |
| 670 | */ |
Pete Zaitcev | 541645b | 2008-02-09 00:10:17 -0800 | [diff] [blame] | 671 | sg_init_table(&urq->sgv[0], UB_MAX_REQ_SG); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 672 | n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]); |
| 673 | if (n_elem < 0) { |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 674 | /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */ |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 675 | printk(KERN_INFO "%s: failed request map (%d)\n", |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 676 | lun->name, n_elem); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 677 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 679 | if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | printk(KERN_WARNING "%s: request with %d segments\n", |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 681 | lun->name, n_elem); |
| 682 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 684 | urq->nsg = n_elem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 686 | if (blk_pc_request(rq)) { |
| 687 | ub_cmd_build_packet(sc, lun, cmd, urq); |
| 688 | } else { |
| 689 | ub_cmd_build_block(sc, lun, cmd, urq); |
| 690 | } |
| 691 | cmd->state = UB_CMDST_INIT; |
| 692 | cmd->lun = lun; |
| 693 | cmd->done = ub_rw_cmd_done; |
| 694 | cmd->back = urq; |
| 695 | |
| 696 | cmd->tag = sc->tagcnt++; |
| 697 | if (ub_submit_scsi(sc, cmd) != 0) |
| 698 | goto drop; |
| 699 | |
| 700 | return 0; |
| 701 | |
| 702 | drop: |
| 703 | ub_put_cmd(lun, cmd); |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 704 | ub_end_rq(rq, DID_ERROR << 16); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 705 | return 0; |
| 706 | } |
| 707 | |
| 708 | static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun, |
| 709 | struct ub_scsi_cmd *cmd, struct ub_request *urq) |
| 710 | { |
| 711 | struct request *rq = urq->rq; |
| 712 | unsigned int block, nblks; |
| 713 | |
| 714 | if (rq_data_dir(rq) == WRITE) |
| 715 | cmd->dir = UB_DIR_WRITE; |
| 716 | else |
| 717 | cmd->dir = UB_DIR_READ; |
| 718 | |
| 719 | cmd->nsg = urq->nsg; |
| 720 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); |
| 721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | /* |
| 723 | * build the command |
| 724 | * |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 725 | * The call to blk_queue_logical_block_size() guarantees that request |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | * is aligned, but it is given in terms of 512 byte units, always. |
| 727 | */ |
Tejun Heo | 83096eb | 2009-05-07 22:24:39 +0900 | [diff] [blame] | 728 | block = blk_rq_pos(rq) >> lun->capacity.bshift; |
| 729 | nblks = blk_rq_sectors(rq) >> lun->capacity.bshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 731 | cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ |
| 733 | cmd->cdb[2] = block >> 24; |
| 734 | cmd->cdb[3] = block >> 16; |
| 735 | cmd->cdb[4] = block >> 8; |
| 736 | cmd->cdb[5] = block; |
| 737 | cmd->cdb[7] = nblks >> 8; |
| 738 | cmd->cdb[8] = nblks; |
| 739 | cmd->cdb_len = 10; |
| 740 | |
Tejun Heo | 1011c1b | 2009-05-07 22:24:45 +0900 | [diff] [blame] | 741 | cmd->len = blk_rq_bytes(rq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 744 | static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun, |
| 745 | struct ub_scsi_cmd *cmd, struct ub_request *urq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 747 | struct request *rq = urq->rq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Tejun Heo | b079041 | 2009-05-07 22:24:42 +0900 | [diff] [blame] | 749 | if (blk_rq_bytes(rq) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | cmd->dir = UB_DIR_NONE; |
| 751 | } else { |
| 752 | if (rq_data_dir(rq) == WRITE) |
| 753 | cmd->dir = UB_DIR_WRITE; |
| 754 | else |
| 755 | cmd->dir = UB_DIR_READ; |
| 756 | } |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 757 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 758 | cmd->nsg = urq->nsg; |
| 759 | memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 760 | |
| 761 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); |
| 762 | cmd->cdb_len = rq->cmd_len; |
| 763 | |
Tejun Heo | b079041 | 2009-05-07 22:24:42 +0900 | [diff] [blame] | 764 | cmd->len = blk_rq_bytes(rq); |
Pete Zaitcev | 2c51ae7 | 2008-04-19 14:32:18 -0700 | [diff] [blame] | 765 | |
| 766 | /* |
| 767 | * To reapply this to every URB is not as incorrect as it looks. |
| 768 | * In return, we avoid any complicated tracking calculations. |
| 769 | */ |
| 770 | cmd->timeo = rq->timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 774 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 775 | struct ub_lun *lun = cmd->lun; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 776 | struct ub_request *urq = cmd->back; |
| 777 | struct request *rq; |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 778 | unsigned int scsi_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 780 | rq = urq->rq; |
| 781 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 782 | if (cmd->error == 0) { |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 783 | if (blk_pc_request(rq)) { |
Tejun Heo | 5f49f63 | 2009-05-19 18:33:05 +0900 | [diff] [blame] | 784 | if (cmd->act_len >= rq->resid_len) |
| 785 | rq->resid_len = 0; |
| 786 | else |
| 787 | rq->resid_len -= cmd->act_len; |
Pete Zaitcev | ef45cb6 | 2008-04-08 17:41:51 -0700 | [diff] [blame] | 788 | scsi_status = 0; |
| 789 | } else { |
| 790 | if (cmd->act_len != cmd->len) { |
Pete Zaitcev | ef45cb6 | 2008-04-08 17:41:51 -0700 | [diff] [blame] | 791 | scsi_status = SAM_STAT_CHECK_CONDITION; |
| 792 | } else { |
| 793 | scsi_status = 0; |
| 794 | } |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 795 | } |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 796 | } else { |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 797 | if (blk_pc_request(rq)) { |
| 798 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ |
| 799 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); |
| 800 | rq->sense_len = UB_SENSE_SIZE; |
| 801 | if (sc->top_sense[0] != 0) |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 802 | scsi_status = SAM_STAT_CHECK_CONDITION; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 803 | else |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 804 | scsi_status = DID_ERROR << 16; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 805 | } else { |
Pete Zaitcev | 82fe26b | 2008-04-19 14:35:30 -0700 | [diff] [blame] | 806 | if (cmd->error == -EIO && |
| 807 | (cmd->key == 0 || |
| 808 | cmd->key == MEDIUM_ERROR || |
| 809 | cmd->key == UNIT_ATTENTION)) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 810 | if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0) |
| 811 | return; |
| 812 | } |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 813 | scsi_status = SAM_STAT_CHECK_CONDITION; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 814 | } |
| 815 | } |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 816 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 817 | urq->rq = NULL; |
| 818 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 819 | ub_put_cmd(lun, cmd); |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 820 | ub_end_rq(rq, scsi_status); |
Pete Zaitcev | ba6abf1 | 2005-07-30 22:38:30 -0700 | [diff] [blame] | 821 | blk_start_queue(lun->disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 824 | static void ub_end_rq(struct request *rq, unsigned int scsi_status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
Kiyoshi Ueda | 7d699ba | 2007-12-11 17:46:47 -0500 | [diff] [blame] | 826 | int error; |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 827 | |
| 828 | if (scsi_status == 0) { |
Kiyoshi Ueda | 7d699ba | 2007-12-11 17:46:47 -0500 | [diff] [blame] | 829 | error = 0; |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 830 | } else { |
Kiyoshi Ueda | 7d699ba | 2007-12-11 17:46:47 -0500 | [diff] [blame] | 831 | error = -EIO; |
Pete Zaitcev | d1ad4ea | 2006-09-07 16:54:22 -0700 | [diff] [blame] | 832 | rq->errors = scsi_status; |
| 833 | } |
Tejun Heo | 3755100 | 2009-05-19 18:33:04 +0900 | [diff] [blame] | 834 | __blk_end_request_all(rq, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 837 | static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun, |
| 838 | struct ub_request *urq, struct ub_scsi_cmd *cmd) |
| 839 | { |
| 840 | |
| 841 | if (atomic_read(&sc->poison)) |
| 842 | return -ENXIO; |
| 843 | |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 844 | ub_reset_enter(sc, urq->current_try); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 845 | |
| 846 | if (urq->current_try >= 3) |
| 847 | return -EIO; |
| 848 | urq->current_try++; |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 849 | |
| 850 | /* Remove this if anyone complains of flooding. */ |
| 851 | printk(KERN_DEBUG "%s: dir %c len/act %d/%d " |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 852 | "[sense %x %02x %02x] retry %d\n", |
| 853 | sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len, |
| 854 | cmd->key, cmd->asc, cmd->ascq, urq->current_try); |
| 855 | |
| 856 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); |
| 857 | ub_cmd_build_block(sc, lun, cmd, urq); |
| 858 | |
| 859 | cmd->state = UB_CMDST_INIT; |
| 860 | cmd->lun = lun; |
| 861 | cmd->done = ub_rw_cmd_done; |
| 862 | cmd->back = urq; |
| 863 | |
| 864 | cmd->tag = sc->tagcnt++; |
| 865 | |
| 866 | #if 0 /* Wasteful */ |
| 867 | return ub_submit_scsi(sc, cmd); |
| 868 | #else |
| 869 | ub_cmdq_add(sc, cmd); |
| 870 | return 0; |
| 871 | #endif |
| 872 | } |
| 873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | /* |
| 875 | * Submit a regular SCSI operation (not an auto-sense). |
| 876 | * |
| 877 | * The Iron Law of Good Submit Routine is: |
| 878 | * Zero return - callback is done, Nonzero return - callback is not done. |
| 879 | * No exceptions. |
| 880 | * |
| 881 | * Host is assumed locked. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | */ |
| 883 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 884 | { |
| 885 | |
| 886 | if (cmd->state != UB_CMDST_INIT || |
| 887 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { |
| 888 | return -EINVAL; |
| 889 | } |
| 890 | |
| 891 | ub_cmdq_add(sc, cmd); |
| 892 | /* |
| 893 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little |
| 894 | * safer to jump to a tasklet, in case upper layers do something silly. |
| 895 | */ |
| 896 | tasklet_schedule(&sc->tasklet); |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Submit the first URB for the queued command. |
| 902 | * This function does not deal with queueing in any way. |
| 903 | */ |
| 904 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 905 | { |
| 906 | struct bulk_cb_wrap *bcb; |
| 907 | int rc; |
| 908 | |
| 909 | bcb = &sc->work_bcb; |
| 910 | |
| 911 | /* |
| 912 | * ``If the allocation length is eighteen or greater, and a device |
| 913 | * server returns less than eithteen bytes of data, the application |
| 914 | * client should assume that the bytes not transferred would have been |
| 915 | * zeroes had the device server returned those bytes.'' |
| 916 | * |
| 917 | * We zero sense for all commands so that when a packet request |
| 918 | * fails it does not return a stale sense. |
| 919 | */ |
| 920 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); |
| 921 | |
| 922 | /* set up the command wrapper */ |
| 923 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); |
| 924 | bcb->Tag = cmd->tag; /* Endianness is not important */ |
| 925 | bcb->DataTransferLength = cpu_to_le32(cmd->len); |
| 926 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 927 | bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | bcb->Length = cmd->cdb_len; |
| 929 | |
| 930 | /* copy the command payload */ |
| 931 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); |
| 932 | |
| 933 | UB_INIT_COMPLETION(sc->work_done); |
| 934 | |
| 935 | sc->last_pipe = sc->send_bulk_pipe; |
| 936 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, |
| 937 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 940 | /* XXX Clear stalls */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | ub_complete(&sc->work_done); |
| 942 | return rc; |
| 943 | } |
| 944 | |
| 945 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; |
| 946 | add_timer(&sc->work_timer); |
| 947 | |
| 948 | cmd->state = UB_CMDST_CMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | /* |
| 953 | * Timeout handler. |
| 954 | */ |
| 955 | static void ub_urb_timeout(unsigned long arg) |
| 956 | { |
| 957 | struct ub_dev *sc = (struct ub_dev *) arg; |
| 958 | unsigned long flags; |
| 959 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 960 | spin_lock_irqsave(sc->lock, flags); |
Pete Zaitcev | b31f821 | 2006-01-05 00:14:02 -0800 | [diff] [blame] | 961 | if (!ub_is_completed(&sc->work_done)) |
| 962 | usb_unlink_urb(&sc->work_urb); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 963 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | /* |
| 967 | * Completion routine for the work URB. |
| 968 | * |
| 969 | * This can be called directly from usb_submit_urb (while we have |
| 970 | * the sc->lock taken) and from an interrupt (while we do NOT have |
| 971 | * the sc->lock taken). Therefore, bounce this off to a tasklet. |
| 972 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 973 | static void ub_urb_complete(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | { |
| 975 | struct ub_dev *sc = urb->context; |
| 976 | |
| 977 | ub_complete(&sc->work_done); |
| 978 | tasklet_schedule(&sc->tasklet); |
| 979 | } |
| 980 | |
| 981 | static void ub_scsi_action(unsigned long _dev) |
| 982 | { |
| 983 | struct ub_dev *sc = (struct ub_dev *) _dev; |
| 984 | unsigned long flags; |
| 985 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 986 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | ub_scsi_dispatch(sc); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 988 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
| 990 | |
| 991 | static void ub_scsi_dispatch(struct ub_dev *sc) |
| 992 | { |
| 993 | struct ub_scsi_cmd *cmd; |
| 994 | int rc; |
| 995 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 996 | while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | if (cmd->state == UB_CMDST_DONE) { |
| 998 | ub_cmdq_pop(sc); |
| 999 | (*cmd->done)(sc, cmd); |
| 1000 | } else if (cmd->state == UB_CMDST_INIT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) |
| 1002 | break; |
| 1003 | cmd->error = rc; |
| 1004 | cmd->state = UB_CMDST_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | } else { |
| 1006 | if (!ub_is_completed(&sc->work_done)) |
| 1007 | break; |
Pete Zaitcev | b31f821 | 2006-01-05 00:14:02 -0800 | [diff] [blame] | 1008 | del_timer(&sc->work_timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | ub_scsi_urb_compl(sc, cmd); |
| 1010 | } |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1015 | { |
| 1016 | struct urb *urb = &sc->work_urb; |
| 1017 | struct bulk_cs_wrap *bcs; |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1018 | int endp; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1019 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | int rc; |
| 1021 | |
| 1022 | if (atomic_read(&sc->poison)) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1023 | ub_state_done(sc, cmd, -ENODEV); |
| 1024 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | } |
| 1026 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1027 | endp = usb_pipeendpoint(sc->last_pipe); |
| 1028 | if (usb_pipein(sc->last_pipe)) |
| 1029 | endp |= USB_DIR_IN; |
| 1030 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | if (cmd->state == UB_CMDST_CLEAR) { |
| 1032 | if (urb->status == -EPIPE) { |
| 1033 | /* |
| 1034 | * STALL while clearning STALL. |
| 1035 | * The control pipe clears itself - nothing to do. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1037 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1038 | sc->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | goto Bad_End; |
| 1040 | } |
| 1041 | |
| 1042 | /* |
| 1043 | * We ignore the result for the halt clear. |
| 1044 | */ |
| 1045 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1046 | usb_reset_endpoint(sc->dev, endp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
| 1048 | ub_state_sense(sc, cmd); |
| 1049 | |
| 1050 | } else if (cmd->state == UB_CMDST_CLR2STS) { |
| 1051 | if (urb->status == -EPIPE) { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1052 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1053 | sc->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | goto Bad_End; |
| 1055 | } |
| 1056 | |
| 1057 | /* |
| 1058 | * We ignore the result for the halt clear. |
| 1059 | */ |
| 1060 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1061 | usb_reset_endpoint(sc->dev, endp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
| 1063 | ub_state_stat(sc, cmd); |
| 1064 | |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1065 | } else if (cmd->state == UB_CMDST_CLRRS) { |
| 1066 | if (urb->status == -EPIPE) { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1067 | printk(KERN_NOTICE "%s: stall on control pipe\n", |
| 1068 | sc->name); |
| 1069 | goto Bad_End; |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * We ignore the result for the halt clear. |
| 1074 | */ |
| 1075 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 1076 | usb_reset_endpoint(sc->dev, endp); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1077 | |
| 1078 | ub_state_stat_counted(sc, cmd); |
| 1079 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | } else if (cmd->state == UB_CMDST_CMD) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1081 | switch (urb->status) { |
| 1082 | case 0: |
| 1083 | break; |
| 1084 | case -EOVERFLOW: |
| 1085 | goto Bad_End; |
| 1086 | case -EPIPE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1088 | if (rc != 0) { |
| 1089 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1090 | "unable to submit clear (%d)\n", |
| 1091 | sc->name, rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | /* |
| 1093 | * This is typically ENOMEM or some other such shit. |
| 1094 | * Retrying is pointless. Just do Bad End on it... |
| 1095 | */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1096 | ub_state_done(sc, cmd, rc); |
| 1097 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | } |
| 1099 | cmd->state = UB_CMDST_CLEAR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | return; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1101 | case -ESHUTDOWN: /* unplug */ |
| 1102 | case -EILSEQ: /* unplug timeout on uhci */ |
| 1103 | ub_state_done(sc, cmd, -ENODEV); |
| 1104 | return; |
| 1105 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | goto Bad_End; |
| 1107 | } |
| 1108 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | goto Bad_End; |
| 1110 | } |
| 1111 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1112 | if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | ub_state_stat(sc, cmd); |
| 1114 | return; |
| 1115 | } |
| 1116 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1117 | // udelay(125); // usb-storage has this |
| 1118 | ub_data_start(sc, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | } else if (cmd->state == UB_CMDST_DATA) { |
| 1121 | if (urb->status == -EPIPE) { |
| 1122 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1123 | if (rc != 0) { |
| 1124 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1125 | "unable to submit clear (%d)\n", |
| 1126 | sc->name, rc); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1127 | ub_state_done(sc, cmd, rc); |
| 1128 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | } |
| 1130 | cmd->state = UB_CMDST_CLR2STS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | return; |
| 1132 | } |
| 1133 | if (urb->status == -EOVERFLOW) { |
| 1134 | /* |
| 1135 | * A babble? Failure, but we must transfer CSW now. |
| 1136 | */ |
| 1137 | cmd->error = -EOVERFLOW; /* A cheap trick... */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1138 | ub_state_stat(sc, cmd); |
| 1139 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1141 | |
| 1142 | if (cmd->dir == UB_DIR_WRITE) { |
| 1143 | /* |
| 1144 | * Do not continue writes in case of a failure. |
| 1145 | * Doing so would cause sectors to be mixed up, |
| 1146 | * which is worse than sectors lost. |
| 1147 | * |
| 1148 | * We must try to read the CSW, or many devices |
| 1149 | * get confused. |
| 1150 | */ |
| 1151 | len = urb->actual_length; |
| 1152 | if (urb->status != 0 || |
| 1153 | len != cmd->sgv[cmd->current_sg].length) { |
| 1154 | cmd->act_len += len; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1155 | |
| 1156 | cmd->error = -EIO; |
| 1157 | ub_state_stat(sc, cmd); |
| 1158 | return; |
| 1159 | } |
| 1160 | |
| 1161 | } else { |
| 1162 | /* |
| 1163 | * If an error occurs on read, we record it, and |
| 1164 | * continue to fetch data in order to avoid bubble. |
| 1165 | * |
| 1166 | * As a small shortcut, we stop if we detect that |
| 1167 | * a CSW mixed into data. |
| 1168 | */ |
| 1169 | if (urb->status != 0) |
| 1170 | cmd->error = -EIO; |
| 1171 | |
| 1172 | len = urb->actual_length; |
| 1173 | if (urb->status != 0 || |
| 1174 | len != cmd->sgv[cmd->current_sg].length) { |
| 1175 | if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN) |
| 1176 | goto Bad_End; |
| 1177 | } |
| 1178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1180 | cmd->act_len += urb->actual_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1182 | if (++cmd->current_sg < cmd->nsg) { |
| 1183 | ub_data_start(sc, cmd); |
| 1184 | return; |
| 1185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | ub_state_stat(sc, cmd); |
| 1187 | |
| 1188 | } else if (cmd->state == UB_CMDST_STAT) { |
| 1189 | if (urb->status == -EPIPE) { |
| 1190 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); |
| 1191 | if (rc != 0) { |
| 1192 | printk(KERN_NOTICE "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1193 | "unable to submit clear (%d)\n", |
| 1194 | sc->name, rc); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1195 | ub_state_done(sc, cmd, rc); |
| 1196 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | } |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1198 | |
| 1199 | /* |
| 1200 | * Having a stall when getting CSW is an error, so |
| 1201 | * make sure uppper levels are not oblivious to it. |
| 1202 | */ |
| 1203 | cmd->error = -EIO; /* A cheap trick... */ |
| 1204 | |
| 1205 | cmd->state = UB_CMDST_CLRRS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | return; |
| 1207 | } |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1208 | |
| 1209 | /* Catch everything, including -EOVERFLOW and other nasties. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | if (urb->status != 0) |
| 1211 | goto Bad_End; |
| 1212 | |
| 1213 | if (urb->actual_length == 0) { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1214 | ub_state_stat_counted(sc, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return; |
| 1216 | } |
| 1217 | |
| 1218 | /* |
| 1219 | * Check the returned Bulk protocol status. |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1220 | * The status block has to be validated first. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | */ |
| 1222 | |
| 1223 | bcs = &sc->work_bcs; |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1224 | |
| 1225 | if (sc->signature == cpu_to_le32(0)) { |
| 1226 | /* |
| 1227 | * This is the first reply, so do not perform the check. |
| 1228 | * Instead, remember the signature the device uses |
| 1229 | * for future checks. But do not allow a nul. |
| 1230 | */ |
| 1231 | sc->signature = bcs->Signature; |
| 1232 | if (sc->signature == cpu_to_le32(0)) { |
| 1233 | ub_state_stat_counted(sc, cmd); |
| 1234 | return; |
| 1235 | } |
| 1236 | } else { |
| 1237 | if (bcs->Signature != sc->signature) { |
| 1238 | ub_state_stat_counted(sc, cmd); |
| 1239 | return; |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | if (bcs->Tag != cmd->tag) { |
| 1244 | /* |
| 1245 | * This usually happens when we disagree with the |
| 1246 | * device's microcode about something. For instance, |
| 1247 | * a few of them throw this after timeouts. They buffer |
| 1248 | * commands and reply at commands we timed out before. |
| 1249 | * Without flushing these replies we loop forever. |
| 1250 | */ |
| 1251 | ub_state_stat_counted(sc, cmd); |
| 1252 | return; |
| 1253 | } |
| 1254 | |
Pete Zaitcev | 0da13c8 | 2008-04-19 14:42:49 -0700 | [diff] [blame] | 1255 | if (!sc->bad_resid) { |
| 1256 | len = le32_to_cpu(bcs->Residue); |
| 1257 | if (len != cmd->len - cmd->act_len) { |
| 1258 | /* |
| 1259 | * Only start ignoring if this cmd ended well. |
| 1260 | */ |
| 1261 | if (cmd->len == cmd->act_len) { |
| 1262 | printk(KERN_NOTICE "%s: " |
| 1263 | "bad residual %d of %d, ignoring\n", |
| 1264 | sc->name, len, cmd->len); |
| 1265 | sc->bad_resid = 1; |
| 1266 | } |
| 1267 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | switch (bcs->Status) { |
| 1271 | case US_BULK_STAT_OK: |
| 1272 | break; |
| 1273 | case US_BULK_STAT_FAIL: |
| 1274 | ub_state_sense(sc, cmd); |
| 1275 | return; |
| 1276 | case US_BULK_STAT_PHASE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | goto Bad_End; |
| 1278 | default: |
| 1279 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", |
| 1280 | sc->name, bcs->Status); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1281 | ub_state_done(sc, cmd, -EINVAL); |
| 1282 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | } |
| 1284 | |
| 1285 | /* Not zeroing error to preserve a babble indicator */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1286 | if (cmd->error != 0) { |
| 1287 | ub_state_sense(sc, cmd); |
| 1288 | return; |
| 1289 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | cmd->state = UB_CMDST_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | ub_cmdq_pop(sc); |
| 1292 | (*cmd->done)(sc, cmd); |
| 1293 | |
| 1294 | } else if (cmd->state == UB_CMDST_SENSE) { |
| 1295 | ub_state_done(sc, cmd, -EIO); |
| 1296 | |
| 1297 | } else { |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 1298 | printk(KERN_WARNING "%s: wrong command state %d\n", |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1299 | sc->name, cmd->state); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1300 | ub_state_done(sc, cmd, -EINVAL); |
| 1301 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | } |
| 1303 | return; |
| 1304 | |
| 1305 | Bad_End: /* Little Excel is dead */ |
| 1306 | ub_state_done(sc, cmd, -EIO); |
| 1307 | } |
| 1308 | |
| 1309 | /* |
| 1310 | * Factorization helper for the command state machine: |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1311 | * Initiate a data segment transfer. |
| 1312 | */ |
| 1313 | static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1314 | { |
| 1315 | struct scatterlist *sg = &cmd->sgv[cmd->current_sg]; |
| 1316 | int pipe; |
| 1317 | int rc; |
| 1318 | |
| 1319 | UB_INIT_COMPLETION(sc->work_done); |
| 1320 | |
| 1321 | if (cmd->dir == UB_DIR_READ) |
| 1322 | pipe = sc->recv_bulk_pipe; |
| 1323 | else |
| 1324 | pipe = sc->send_bulk_pipe; |
| 1325 | sc->last_pipe = pipe; |
Jens Axboe | 45711f1 | 2007-10-22 21:19:53 +0200 | [diff] [blame] | 1326 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, sg_virt(sg), |
| 1327 | sg->length, ub_urb_complete, sc); |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1328 | |
| 1329 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1330 | /* XXX Clear stalls */ |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1331 | ub_complete(&sc->work_done); |
| 1332 | ub_state_done(sc, cmd, rc); |
| 1333 | return; |
| 1334 | } |
| 1335 | |
Pete Zaitcev | 2c51ae7 | 2008-04-19 14:32:18 -0700 | [diff] [blame] | 1336 | if (cmd->timeo) |
| 1337 | sc->work_timer.expires = jiffies + cmd->timeo; |
| 1338 | else |
| 1339 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1340 | add_timer(&sc->work_timer); |
| 1341 | |
| 1342 | cmd->state = UB_CMDST_DATA; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1343 | } |
| 1344 | |
| 1345 | /* |
| 1346 | * Factorization helper for the command state machine: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | * Finish the command. |
| 1348 | */ |
| 1349 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) |
| 1350 | { |
| 1351 | |
| 1352 | cmd->error = rc; |
| 1353 | cmd->state = UB_CMDST_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | ub_cmdq_pop(sc); |
| 1355 | (*cmd->done)(sc, cmd); |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * Factorization helper for the command state machine: |
| 1360 | * Submit a CSW read. |
| 1361 | */ |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1362 | 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] | 1363 | { |
| 1364 | int rc; |
| 1365 | |
| 1366 | UB_INIT_COMPLETION(sc->work_done); |
| 1367 | |
| 1368 | sc->last_pipe = sc->recv_bulk_pipe; |
| 1369 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, |
| 1370 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | |
| 1372 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1373 | /* XXX Clear stalls */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | ub_complete(&sc->work_done); |
| 1375 | ub_state_done(sc, cmd, rc); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1376 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | } |
| 1378 | |
Pete Zaitcev | 2c51ae7 | 2008-04-19 14:32:18 -0700 | [diff] [blame] | 1379 | if (cmd->timeo) |
| 1380 | sc->work_timer.expires = jiffies + cmd->timeo; |
| 1381 | else |
| 1382 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | add_timer(&sc->work_timer); |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1384 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | } |
| 1386 | |
| 1387 | /* |
| 1388 | * Factorization helper for the command state machine: |
| 1389 | * Submit a CSW read and go to STAT state. |
| 1390 | */ |
| 1391 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1392 | { |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1393 | |
| 1394 | if (__ub_state_stat(sc, cmd) != 0) |
| 1395 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | |
| 1397 | cmd->stat_count = 0; |
| 1398 | cmd->state = UB_CMDST_STAT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | } |
| 1400 | |
| 1401 | /* |
| 1402 | * Factorization helper for the command state machine: |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1403 | * Submit a CSW read and go to STAT state with counter (along [C] path). |
| 1404 | */ |
| 1405 | static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1406 | { |
| 1407 | |
| 1408 | if (++cmd->stat_count >= 4) { |
| 1409 | ub_state_sense(sc, cmd); |
| 1410 | return; |
| 1411 | } |
| 1412 | |
| 1413 | if (__ub_state_stat(sc, cmd) != 0) |
| 1414 | return; |
| 1415 | |
| 1416 | cmd->state = UB_CMDST_STAT; |
Pete Zaitcev | 1872bce | 2005-07-27 11:43:51 -0700 | [diff] [blame] | 1417 | } |
| 1418 | |
| 1419 | /* |
| 1420 | * Factorization helper for the command state machine: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | * Submit a REQUEST SENSE and go to SENSE state. |
| 1422 | */ |
| 1423 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1424 | { |
| 1425 | struct ub_scsi_cmd *scmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1426 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | int rc; |
| 1428 | |
| 1429 | if (cmd->cdb[0] == REQUEST_SENSE) { |
| 1430 | rc = -EPIPE; |
| 1431 | goto error; |
| 1432 | } |
| 1433 | |
| 1434 | scmd = &sc->top_rqs_cmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1435 | memset(scmd, 0, sizeof(struct ub_scsi_cmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | scmd->cdb[0] = REQUEST_SENSE; |
| 1437 | scmd->cdb[4] = UB_SENSE_SIZE; |
| 1438 | scmd->cdb_len = 6; |
| 1439 | scmd->dir = UB_DIR_READ; |
| 1440 | scmd->state = UB_CMDST_INIT; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1441 | scmd->nsg = 1; |
| 1442 | sg = &scmd->sgv[0]; |
FUJITA Tomonori | 4f33a9d | 2007-10-25 09:17:03 +0200 | [diff] [blame] | 1443 | sg_init_table(sg, UB_MAX_REQ_SG); |
Jens Axboe | 642f149 | 2007-10-24 11:20:47 +0200 | [diff] [blame] | 1444 | sg_set_page(sg, virt_to_page(sc->top_sense), UB_SENSE_SIZE, |
| 1445 | (unsigned long)sc->top_sense & (PAGE_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | scmd->len = UB_SENSE_SIZE; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1447 | scmd->lun = cmd->lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | scmd->done = ub_top_sense_done; |
| 1449 | scmd->back = cmd; |
| 1450 | |
| 1451 | scmd->tag = sc->tagcnt++; |
| 1452 | |
| 1453 | cmd->state = UB_CMDST_SENSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
| 1455 | ub_cmdq_insert(sc, scmd); |
| 1456 | return; |
| 1457 | |
| 1458 | error: |
| 1459 | ub_state_done(sc, cmd, rc); |
| 1460 | } |
| 1461 | |
| 1462 | /* |
| 1463 | * A helper for the command's state machine: |
| 1464 | * Submit a stall clear. |
| 1465 | */ |
| 1466 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, |
| 1467 | int stalled_pipe) |
| 1468 | { |
| 1469 | int endp; |
| 1470 | struct usb_ctrlrequest *cr; |
| 1471 | int rc; |
| 1472 | |
| 1473 | endp = usb_pipeendpoint(stalled_pipe); |
| 1474 | if (usb_pipein (stalled_pipe)) |
| 1475 | endp |= USB_DIR_IN; |
| 1476 | |
| 1477 | cr = &sc->work_cr; |
| 1478 | cr->bRequestType = USB_RECIP_ENDPOINT; |
| 1479 | cr->bRequest = USB_REQ_CLEAR_FEATURE; |
| 1480 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); |
| 1481 | cr->wIndex = cpu_to_le16(endp); |
| 1482 | cr->wLength = cpu_to_le16(0); |
| 1483 | |
| 1484 | UB_INIT_COMPLETION(sc->work_done); |
| 1485 | |
| 1486 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 1487 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { |
| 1490 | ub_complete(&sc->work_done); |
| 1491 | return rc; |
| 1492 | } |
| 1493 | |
| 1494 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 1495 | add_timer(&sc->work_timer); |
| 1496 | return 0; |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | */ |
| 1501 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) |
| 1502 | { |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1503 | unsigned char *sense = sc->top_sense; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | struct ub_scsi_cmd *cmd; |
| 1505 | |
| 1506 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | * Find the command which triggered the unit attention or a check, |
| 1508 | * save the sense into it, and advance its state machine. |
| 1509 | */ |
| 1510 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { |
| 1511 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); |
| 1512 | return; |
| 1513 | } |
| 1514 | if (cmd != scmd->back) { |
| 1515 | printk(KERN_WARNING "%s: " |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1516 | "sense done for wrong command 0x%x\n", |
| 1517 | sc->name, cmd->tag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | return; |
| 1519 | } |
| 1520 | if (cmd->state != UB_CMDST_SENSE) { |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 1521 | printk(KERN_WARNING "%s: sense done with bad cmd state %d\n", |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1522 | sc->name, cmd->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | return; |
| 1524 | } |
| 1525 | |
Pete Zaitcev | 952ba22 | 2006-03-02 16:42:59 -0800 | [diff] [blame] | 1526 | /* |
| 1527 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. |
| 1528 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | cmd->key = sense[2] & 0x0F; |
| 1530 | cmd->asc = sense[12]; |
| 1531 | cmd->ascq = sense[13]; |
| 1532 | |
| 1533 | ub_scsi_urb_compl(sc, cmd); |
| 1534 | } |
| 1535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | /* |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1537 | * Reset management |
| 1538 | */ |
| 1539 | |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 1540 | static void ub_reset_enter(struct ub_dev *sc, int try) |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1541 | { |
| 1542 | |
| 1543 | if (sc->reset) { |
| 1544 | /* This happens often on multi-LUN devices. */ |
| 1545 | return; |
| 1546 | } |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 1547 | sc->reset = try + 1; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1548 | |
| 1549 | #if 0 /* Not needed because the disconnect waits for us. */ |
| 1550 | unsigned long flags; |
| 1551 | spin_lock_irqsave(&ub_lock, flags); |
| 1552 | sc->openc++; |
| 1553 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1554 | #endif |
| 1555 | |
| 1556 | #if 0 /* We let them stop themselves. */ |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1557 | struct ub_lun *lun; |
Matthias Kaehlcke | a69228d | 2007-07-09 12:03:07 -0700 | [diff] [blame] | 1558 | list_for_each_entry(lun, &sc->luns, link) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1559 | blk_stop_queue(lun->disk->queue); |
| 1560 | } |
| 1561 | #endif |
| 1562 | |
| 1563 | schedule_work(&sc->reset_work); |
| 1564 | } |
| 1565 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1566 | static void ub_reset_task(struct work_struct *work) |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1567 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1568 | struct ub_dev *sc = container_of(work, struct ub_dev, reset_work); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1569 | unsigned long flags; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1570 | struct ub_lun *lun; |
Alan Stern | 011b15d | 2008-11-04 11:29:27 -0500 | [diff] [blame] | 1571 | int rc; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1572 | |
| 1573 | if (!sc->reset) { |
| 1574 | printk(KERN_WARNING "%s: Running reset unrequested\n", |
| 1575 | sc->name); |
| 1576 | return; |
| 1577 | } |
| 1578 | |
| 1579 | if (atomic_read(&sc->poison)) { |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 1580 | ; |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 1581 | } else if ((sc->reset & 1) == 0) { |
| 1582 | ub_sync_reset(sc); |
| 1583 | msleep(700); /* usb-storage sleeps 6s (!) */ |
| 1584 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
| 1585 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1586 | } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) { |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 1587 | ; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1588 | } else { |
Alan Stern | 011b15d | 2008-11-04 11:29:27 -0500 | [diff] [blame] | 1589 | rc = usb_lock_device_for_reset(sc->dev, sc->intf); |
| 1590 | if (rc < 0) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1591 | printk(KERN_NOTICE |
| 1592 | "%s: usb_lock_device_for_reset failed (%d)\n", |
Alan Stern | 011b15d | 2008-11-04 11:29:27 -0500 | [diff] [blame] | 1593 | sc->name, rc); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1594 | } else { |
| 1595 | rc = usb_reset_device(sc->dev); |
| 1596 | if (rc < 0) { |
| 1597 | printk(KERN_NOTICE "%s: " |
| 1598 | "usb_lock_device_for_reset failed (%d)\n", |
| 1599 | sc->name, rc); |
| 1600 | } |
Alan Stern | 011b15d | 2008-11-04 11:29:27 -0500 | [diff] [blame] | 1601 | usb_unlock_device(sc->dev); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | /* |
| 1606 | * In theory, no commands can be running while reset is active, |
| 1607 | * so nobody can ask for another reset, and so we do not need any |
| 1608 | * queues of resets or anything. We do need a spinlock though, |
| 1609 | * to interact with block layer. |
| 1610 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1611 | spin_lock_irqsave(sc->lock, flags); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1612 | sc->reset = 0; |
| 1613 | tasklet_schedule(&sc->tasklet); |
Matthias Kaehlcke | a69228d | 2007-07-09 12:03:07 -0700 | [diff] [blame] | 1614 | list_for_each_entry(lun, &sc->luns, link) { |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1615 | blk_start_queue(lun->disk->queue); |
| 1616 | } |
| 1617 | wake_up(&sc->reset_wait); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1618 | spin_unlock_irqrestore(sc->lock, flags); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 1619 | } |
| 1620 | |
| 1621 | /* |
Pete Zaitcev | d73b7af | 2008-11-10 21:11:11 -0700 | [diff] [blame] | 1622 | * XXX Reset brackets are too much hassle to implement, so just stub them |
| 1623 | * in order to prevent forced unbinding (which deadlocks solid when our |
| 1624 | * ->disconnect method waits for the reset to complete and this kills keventd). |
| 1625 | * |
| 1626 | * XXX Tell Alan to move usb_unlock_device inside of usb_reset_device, |
| 1627 | * or else the post_reset is invoked, and restats I/O on a locked device. |
| 1628 | */ |
| 1629 | static int ub_pre_reset(struct usb_interface *iface) { |
| 1630 | return 0; |
| 1631 | } |
| 1632 | |
| 1633 | static int ub_post_reset(struct usb_interface *iface) { |
| 1634 | return 0; |
| 1635 | } |
| 1636 | |
| 1637 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | * This is called from a process context. |
| 1639 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1640 | static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | { |
| 1642 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1643 | lun->readonly = 0; /* XXX Query this from the device */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1645 | lun->capacity.nsec = 0; |
| 1646 | lun->capacity.bsize = 512; |
| 1647 | lun->capacity.bshift = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1649 | if (ub_sync_tur(sc, lun) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | return; /* Not ready */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1651 | lun->changed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1653 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | /* |
| 1655 | * The retry here means something is wrong, either with the |
| 1656 | * device, with the transport, or with our code. |
| 1657 | * We keep this because sd.c has retries for capacity. |
| 1658 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1659 | if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) { |
| 1660 | lun->capacity.nsec = 0; |
| 1661 | lun->capacity.bsize = 512; |
| 1662 | lun->capacity.bshift = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | /* |
| 1668 | * The open funcion. |
| 1669 | * This is mostly needed to keep refcounting, but also to support |
| 1670 | * media checks on removable media drives. |
| 1671 | */ |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1672 | static int ub_bd_open(struct block_device *bdev, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | { |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1674 | struct ub_lun *lun = bdev->bd_disk->private_data; |
Pete Zaitcev | 41fea55 | 2006-04-28 20:45:49 -0700 | [diff] [blame] | 1675 | struct ub_dev *sc = lun->udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | unsigned long flags; |
| 1677 | int rc; |
| 1678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | spin_lock_irqsave(&ub_lock, flags); |
| 1680 | if (atomic_read(&sc->poison)) { |
| 1681 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1682 | return -ENXIO; |
| 1683 | } |
| 1684 | sc->openc++; |
| 1685 | spin_unlock_irqrestore(&ub_lock, flags); |
| 1686 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1687 | if (lun->removable || lun->readonly) |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1688 | check_disk_change(bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | |
| 1690 | /* |
| 1691 | * The sd.c considers ->media_present and ->changed not equivalent, |
| 1692 | * under some pretty murky conditions (a failure of READ CAPACITY). |
| 1693 | * We may need it one day. |
| 1694 | */ |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1695 | if (lun->removable && lun->changed && !(mode & FMODE_NDELAY)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | rc = -ENOMEDIUM; |
| 1697 | goto err_open; |
| 1698 | } |
| 1699 | |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1700 | if (lun->readonly && (mode & FMODE_WRITE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | rc = -EROFS; |
| 1702 | goto err_open; |
| 1703 | } |
| 1704 | |
| 1705 | return 0; |
| 1706 | |
| 1707 | err_open: |
| 1708 | ub_put(sc); |
| 1709 | return rc; |
| 1710 | } |
| 1711 | |
| 1712 | /* |
| 1713 | */ |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1714 | static int ub_bd_release(struct gendisk *disk, fmode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1716 | struct ub_lun *lun = disk->private_data; |
| 1717 | struct ub_dev *sc = lun->udev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
| 1719 | ub_put(sc); |
| 1720 | return 0; |
| 1721 | } |
| 1722 | |
| 1723 | /* |
| 1724 | * The ioctl interface. |
| 1725 | */ |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1726 | static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | unsigned int cmd, unsigned long arg) |
| 1728 | { |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1729 | struct gendisk *disk = bdev->bd_disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | void __user *usermem = (void __user *) arg; |
| 1731 | |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1732 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | /* |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 1736 | * This is called by check_disk_change if we reported a media change. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1737 | * The main onjective here is to discover the features of the media such as |
| 1738 | * the capacity, read-only status, etc. USB storage generally does not |
| 1739 | * need to be spun up, but if we needed it, this would be the place. |
| 1740 | * |
| 1741 | * This call can sleep. |
| 1742 | * |
| 1743 | * The return code is not used. |
| 1744 | */ |
| 1745 | static int ub_bd_revalidate(struct gendisk *disk) |
| 1746 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1747 | struct ub_lun *lun = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1749 | ub_revalidate(lun->udev, lun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | |
| 1751 | /* XXX Support sector size switching like in sr.c */ |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 1752 | blk_queue_logical_block_size(disk->queue, lun->capacity.bsize); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1753 | set_capacity(disk, lun->capacity.nsec); |
| 1754 | // set_disk_ro(sdkp->disk, lun->readonly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
| 1756 | return 0; |
| 1757 | } |
| 1758 | |
| 1759 | /* |
| 1760 | * The check is called by the block layer to verify if the media |
| 1761 | * is still available. It is supposed to be harmless, lightweight and |
| 1762 | * non-intrusive in case the media was not changed. |
| 1763 | * |
| 1764 | * This call can sleep. |
| 1765 | * |
| 1766 | * The return code is bool! |
| 1767 | */ |
| 1768 | static int ub_bd_media_changed(struct gendisk *disk) |
| 1769 | { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1770 | struct ub_lun *lun = disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1772 | if (!lun->removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | return 0; |
| 1774 | |
| 1775 | /* |
| 1776 | * We clean checks always after every command, so this is not |
| 1777 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, |
| 1778 | * the device is actually not ready with operator or software |
| 1779 | * intervention required. One dangerous item might be a drive which |
| 1780 | * spins itself down, and come the time to write dirty pages, this |
| 1781 | * will fail, then block layer discards the data. Since we never |
| 1782 | * spin drives up, such devices simply cannot be used with ub anyway. |
| 1783 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1784 | if (ub_sync_tur(lun->udev, lun) != 0) { |
| 1785 | lun->changed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | return 1; |
| 1787 | } |
| 1788 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1789 | return lun->changed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | } |
| 1791 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame^] | 1792 | static const struct block_device_operations ub_bd_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | .owner = THIS_MODULE, |
Al Viro | 4099a96 | 2008-03-02 10:21:43 -0500 | [diff] [blame] | 1794 | .open = ub_bd_open, |
| 1795 | .release = ub_bd_release, |
| 1796 | .locked_ioctl = ub_bd_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | .media_changed = ub_bd_media_changed, |
| 1798 | .revalidate_disk = ub_bd_revalidate, |
| 1799 | }; |
| 1800 | |
| 1801 | /* |
| 1802 | * Common ->done routine for commands executed synchronously. |
| 1803 | */ |
| 1804 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) |
| 1805 | { |
| 1806 | struct completion *cop = cmd->back; |
| 1807 | complete(cop); |
| 1808 | } |
| 1809 | |
| 1810 | /* |
| 1811 | * Test if the device has a check condition on it, synchronously. |
| 1812 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1813 | 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] | 1814 | { |
| 1815 | struct ub_scsi_cmd *cmd; |
| 1816 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; |
| 1817 | unsigned long flags; |
| 1818 | struct completion compl; |
| 1819 | int rc; |
| 1820 | |
| 1821 | init_completion(&compl); |
| 1822 | |
| 1823 | rc = -ENOMEM; |
Pete Zaitcev | 29da793 | 2006-02-13 20:35:57 -0800 | [diff] [blame] | 1824 | if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | goto err_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | |
| 1827 | cmd->cdb[0] = TEST_UNIT_READY; |
| 1828 | cmd->cdb_len = 6; |
| 1829 | cmd->dir = UB_DIR_NONE; |
| 1830 | cmd->state = UB_CMDST_INIT; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1831 | cmd->lun = lun; /* This may be NULL, but that's ok */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | cmd->done = ub_probe_done; |
| 1833 | cmd->back = &compl; |
| 1834 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1835 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | cmd->tag = sc->tagcnt++; |
| 1837 | |
| 1838 | rc = ub_submit_scsi(sc, cmd); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1839 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 1841 | if (rc != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | goto err_submit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | wait_for_completion(&compl); |
| 1845 | |
| 1846 | rc = cmd->error; |
| 1847 | |
| 1848 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ |
| 1849 | rc = cmd->key; |
| 1850 | |
| 1851 | err_submit: |
| 1852 | kfree(cmd); |
| 1853 | err_alloc: |
| 1854 | return rc; |
| 1855 | } |
| 1856 | |
| 1857 | /* |
| 1858 | * Read the SCSI capacity synchronously (for probing). |
| 1859 | */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1860 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun, |
| 1861 | struct ub_capacity *ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | { |
| 1863 | struct ub_scsi_cmd *cmd; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1864 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | char *p; |
| 1866 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; |
| 1867 | unsigned long flags; |
| 1868 | unsigned int bsize, shift; |
| 1869 | unsigned long nsec; |
| 1870 | struct completion compl; |
| 1871 | int rc; |
| 1872 | |
| 1873 | init_completion(&compl); |
| 1874 | |
| 1875 | rc = -ENOMEM; |
Pete Zaitcev | 29da793 | 2006-02-13 20:35:57 -0800 | [diff] [blame] | 1876 | if ((cmd = kzalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | goto err_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); |
| 1879 | |
| 1880 | cmd->cdb[0] = 0x25; |
| 1881 | cmd->cdb_len = 10; |
| 1882 | cmd->dir = UB_DIR_READ; |
| 1883 | cmd->state = UB_CMDST_INIT; |
Pete Zaitcev | a1cf96e | 2005-08-14 21:16:03 -0700 | [diff] [blame] | 1884 | cmd->nsg = 1; |
| 1885 | sg = &cmd->sgv[0]; |
FUJITA Tomonori | 4f33a9d | 2007-10-25 09:17:03 +0200 | [diff] [blame] | 1886 | sg_init_table(sg, UB_MAX_REQ_SG); |
Jens Axboe | 642f149 | 2007-10-24 11:20:47 +0200 | [diff] [blame] | 1887 | sg_set_page(sg, virt_to_page(p), 8, (unsigned long)p & (PAGE_SIZE-1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | cmd->len = 8; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1889 | cmd->lun = lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | cmd->done = ub_probe_done; |
| 1891 | cmd->back = &compl; |
| 1892 | |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1893 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | cmd->tag = sc->tagcnt++; |
| 1895 | |
| 1896 | rc = ub_submit_scsi(sc, cmd); |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 1897 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 1899 | if (rc != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | goto err_submit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
| 1902 | wait_for_completion(&compl); |
| 1903 | |
| 1904 | if (cmd->error != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | rc = -EIO; |
| 1906 | goto err_read; |
| 1907 | } |
| 1908 | if (cmd->act_len != 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | rc = -EIO; |
| 1910 | goto err_read; |
| 1911 | } |
| 1912 | |
| 1913 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ |
| 1914 | nsec = be32_to_cpu(*(__be32 *)p) + 1; |
| 1915 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); |
| 1916 | switch (bsize) { |
| 1917 | case 512: shift = 0; break; |
| 1918 | case 1024: shift = 1; break; |
| 1919 | case 2048: shift = 2; break; |
| 1920 | case 4096: shift = 3; break; |
| 1921 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | rc = -EDOM; |
| 1923 | goto err_inv_bsize; |
| 1924 | } |
| 1925 | |
| 1926 | ret->bsize = bsize; |
| 1927 | ret->bshift = shift; |
| 1928 | ret->nsec = nsec << shift; |
| 1929 | rc = 0; |
| 1930 | |
| 1931 | err_inv_bsize: |
| 1932 | err_read: |
| 1933 | err_submit: |
| 1934 | kfree(cmd); |
| 1935 | err_alloc: |
| 1936 | return rc; |
| 1937 | } |
| 1938 | |
| 1939 | /* |
| 1940 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1941 | static void ub_probe_urb_complete(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | { |
| 1943 | struct completion *cop = urb->context; |
| 1944 | complete(cop); |
| 1945 | } |
| 1946 | |
| 1947 | static void ub_probe_timeout(unsigned long arg) |
| 1948 | { |
| 1949 | struct completion *cop = (struct completion *) arg; |
| 1950 | complete(cop); |
| 1951 | } |
| 1952 | |
| 1953 | /* |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 1954 | * Reset with a Bulk reset. |
| 1955 | */ |
| 1956 | static int ub_sync_reset(struct ub_dev *sc) |
| 1957 | { |
| 1958 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; |
| 1959 | struct usb_ctrlrequest *cr; |
| 1960 | struct completion compl; |
| 1961 | struct timer_list timer; |
| 1962 | int rc; |
| 1963 | |
| 1964 | init_completion(&compl); |
| 1965 | |
| 1966 | cr = &sc->work_cr; |
| 1967 | cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE; |
| 1968 | cr->bRequest = US_BULK_RESET_REQUEST; |
| 1969 | cr->wValue = cpu_to_le16(0); |
| 1970 | cr->wIndex = cpu_to_le16(ifnum); |
| 1971 | cr->wLength = cpu_to_le16(0); |
| 1972 | |
| 1973 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 1974 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); |
Pete Zaitcev | 2c2e4a2 | 2006-01-05 00:26:30 -0800 | [diff] [blame] | 1975 | |
| 1976 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { |
| 1977 | printk(KERN_WARNING |
| 1978 | "%s: Unable to submit a bulk reset (%d)\n", sc->name, rc); |
| 1979 | return rc; |
| 1980 | } |
| 1981 | |
| 1982 | init_timer(&timer); |
| 1983 | timer.function = ub_probe_timeout; |
| 1984 | timer.data = (unsigned long) &compl; |
| 1985 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 1986 | add_timer(&timer); |
| 1987 | |
| 1988 | wait_for_completion(&compl); |
| 1989 | |
| 1990 | del_timer_sync(&timer); |
| 1991 | usb_kill_urb(&sc->work_urb); |
| 1992 | |
| 1993 | return sc->work_urb.status; |
| 1994 | } |
| 1995 | |
| 1996 | /* |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 1997 | * Get number of LUNs by the way of Bulk GetMaxLUN command. |
| 1998 | */ |
| 1999 | static int ub_sync_getmaxlun(struct ub_dev *sc) |
| 2000 | { |
| 2001 | int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber; |
| 2002 | unsigned char *p; |
| 2003 | enum { ALLOC_SIZE = 1 }; |
| 2004 | struct usb_ctrlrequest *cr; |
| 2005 | struct completion compl; |
| 2006 | struct timer_list timer; |
| 2007 | int nluns; |
| 2008 | int rc; |
| 2009 | |
| 2010 | init_completion(&compl); |
| 2011 | |
| 2012 | rc = -ENOMEM; |
| 2013 | if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) |
| 2014 | goto err_alloc; |
| 2015 | *p = 55; |
| 2016 | |
| 2017 | cr = &sc->work_cr; |
| 2018 | cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE; |
| 2019 | cr->bRequest = US_BULK_GET_MAX_LUN; |
| 2020 | cr->wValue = cpu_to_le16(0); |
| 2021 | cr->wIndex = cpu_to_le16(ifnum); |
| 2022 | cr->wLength = cpu_to_le16(1); |
| 2023 | |
| 2024 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe, |
| 2025 | (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2026 | |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 2027 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2028 | goto err_submit; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2029 | |
| 2030 | init_timer(&timer); |
| 2031 | timer.function = ub_probe_timeout; |
| 2032 | timer.data = (unsigned long) &compl; |
| 2033 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 2034 | add_timer(&timer); |
| 2035 | |
| 2036 | wait_for_completion(&compl); |
| 2037 | |
| 2038 | del_timer_sync(&timer); |
| 2039 | usb_kill_urb(&sc->work_urb); |
| 2040 | |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 2041 | if ((rc = sc->work_urb.status) < 0) |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2042 | goto err_io; |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2043 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2044 | if (sc->work_urb.actual_length != 1) { |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2045 | nluns = 0; |
| 2046 | } else { |
| 2047 | if ((nluns = *p) == 55) { |
| 2048 | nluns = 0; |
| 2049 | } else { |
| 2050 | /* GetMaxLUN returns the maximum LUN number */ |
| 2051 | nluns += 1; |
| 2052 | if (nluns > UB_MAX_LUNS) |
| 2053 | nluns = UB_MAX_LUNS; |
| 2054 | } |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2055 | } |
| 2056 | |
| 2057 | kfree(p); |
| 2058 | return nluns; |
| 2059 | |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2060 | err_io: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2061 | err_submit: |
| 2062 | kfree(p); |
| 2063 | err_alloc: |
| 2064 | return rc; |
| 2065 | } |
| 2066 | |
| 2067 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | * Clear initial stalls. |
| 2069 | */ |
| 2070 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) |
| 2071 | { |
| 2072 | int endp; |
| 2073 | struct usb_ctrlrequest *cr; |
| 2074 | struct completion compl; |
| 2075 | struct timer_list timer; |
| 2076 | int rc; |
| 2077 | |
| 2078 | init_completion(&compl); |
| 2079 | |
| 2080 | endp = usb_pipeendpoint(stalled_pipe); |
| 2081 | if (usb_pipein (stalled_pipe)) |
| 2082 | endp |= USB_DIR_IN; |
| 2083 | |
| 2084 | cr = &sc->work_cr; |
| 2085 | cr->bRequestType = USB_RECIP_ENDPOINT; |
| 2086 | cr->bRequest = USB_REQ_CLEAR_FEATURE; |
| 2087 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); |
| 2088 | cr->wIndex = cpu_to_le16(endp); |
| 2089 | cr->wLength = cpu_to_le16(0); |
| 2090 | |
| 2091 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, |
| 2092 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
| 2094 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { |
| 2095 | printk(KERN_WARNING |
| 2096 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); |
| 2097 | return rc; |
| 2098 | } |
| 2099 | |
| 2100 | init_timer(&timer); |
| 2101 | timer.function = ub_probe_timeout; |
| 2102 | timer.data = (unsigned long) &compl; |
| 2103 | timer.expires = jiffies + UB_CTRL_TIMEOUT; |
| 2104 | add_timer(&timer); |
| 2105 | |
| 2106 | wait_for_completion(&compl); |
| 2107 | |
| 2108 | del_timer_sync(&timer); |
| 2109 | usb_kill_urb(&sc->work_urb); |
| 2110 | |
David Vrabel | 3444b26 | 2009-04-08 17:36:28 +0000 | [diff] [blame] | 2111 | usb_reset_endpoint(sc->dev, endp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | |
| 2113 | return 0; |
| 2114 | } |
| 2115 | |
| 2116 | /* |
| 2117 | * Get the pipe settings. |
| 2118 | */ |
| 2119 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, |
| 2120 | struct usb_interface *intf) |
| 2121 | { |
| 2122 | struct usb_host_interface *altsetting = intf->cur_altsetting; |
| 2123 | struct usb_endpoint_descriptor *ep_in = NULL; |
| 2124 | struct usb_endpoint_descriptor *ep_out = NULL; |
| 2125 | struct usb_endpoint_descriptor *ep; |
| 2126 | int i; |
| 2127 | |
| 2128 | /* |
| 2129 | * Find the endpoints we need. |
| 2130 | * We are expecting a minimum of 2 endpoints - in and out (bulk). |
| 2131 | * We will ignore any others. |
| 2132 | */ |
| 2133 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { |
| 2134 | ep = &altsetting->endpoint[i].desc; |
| 2135 | |
| 2136 | /* Is it a BULK endpoint? */ |
Julia Lawall | db5e6df | 2008-12-29 11:19:10 +0100 | [diff] [blame] | 2137 | if (usb_endpoint_xfer_bulk(ep)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | /* BULK in or out? */ |
Julia Lawall | db5e6df | 2008-12-29 11:19:10 +0100 | [diff] [blame] | 2139 | if (usb_endpoint_dir_in(ep)) { |
Pete Zaitcev | 643616e | 2007-03-08 19:56:23 -0800 | [diff] [blame] | 2140 | if (ep_in == NULL) |
| 2141 | ep_in = ep; |
| 2142 | } else { |
| 2143 | if (ep_out == NULL) |
| 2144 | ep_out = ep; |
| 2145 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | } |
| 2147 | } |
| 2148 | |
| 2149 | if (ep_in == NULL || ep_out == NULL) { |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 2150 | printk(KERN_NOTICE "%s: failed endpoint check\n", sc->name); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2151 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | } |
| 2153 | |
| 2154 | /* Calculate and store the pipe values */ |
| 2155 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); |
| 2156 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); |
| 2157 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, |
Julia Lawall | db5e6df | 2008-12-29 11:19:10 +0100 | [diff] [blame] | 2158 | usb_endpoint_num(ep_out)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, |
Julia Lawall | db5e6df | 2008-12-29 11:19:10 +0100 | [diff] [blame] | 2160 | usb_endpoint_num(ep_in)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | |
| 2162 | return 0; |
| 2163 | } |
| 2164 | |
| 2165 | /* |
| 2166 | * Probing is done in the process context, which allows us to cheat |
| 2167 | * and not to build a state machine for the discovery. |
| 2168 | */ |
| 2169 | static int ub_probe(struct usb_interface *intf, |
| 2170 | const struct usb_device_id *dev_id) |
| 2171 | { |
| 2172 | struct ub_dev *sc; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2173 | int nluns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | int rc; |
| 2175 | int i; |
| 2176 | |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2177 | if (usb_usual_check_type(dev_id, USB_US_TYPE_UB)) |
| 2178 | return -ENXIO; |
| 2179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | rc = -ENOMEM; |
Pete Zaitcev | 29da793 | 2006-02-13 20:35:57 -0800 | [diff] [blame] | 2181 | if ((sc = kzalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | goto err_core; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2183 | sc->lock = ub_next_lock(); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2184 | INIT_LIST_HEAD(&sc->luns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | usb_init_urb(&sc->work_urb); |
| 2186 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); |
| 2187 | atomic_set(&sc->poison, 0); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2188 | INIT_WORK(&sc->reset_work, ub_reset_task); |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2189 | init_waitqueue_head(&sc->reset_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | |
| 2191 | init_timer(&sc->work_timer); |
| 2192 | sc->work_timer.data = (unsigned long) sc; |
| 2193 | sc->work_timer.function = ub_urb_timeout; |
| 2194 | |
| 2195 | ub_init_completion(&sc->work_done); |
| 2196 | sc->work_done.done = 1; /* A little yuk, but oh well... */ |
| 2197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | sc->dev = interface_to_usbdev(intf); |
| 2199 | sc->intf = intf; |
| 2200 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2201 | usb_set_intfdata(intf, sc); |
| 2202 | usb_get_dev(sc->dev); |
Pete Zaitcev | 77ef6c4 | 2006-05-03 00:16:00 -0700 | [diff] [blame] | 2203 | /* |
| 2204 | * Since we give the interface struct to the block level through |
| 2205 | * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent |
| 2206 | * oopses on close after a disconnect (kernels 2.6.16 and up). |
| 2207 | */ |
| 2208 | usb_get_intf(sc->intf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2210 | snprintf(sc->name, 12, DRV_NAME "(%d.%d)", |
| 2211 | sc->dev->bus->busnum, sc->dev->devnum); |
| 2212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2213 | /* XXX Verify that we can handle the device (from descriptors) */ |
| 2214 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2215 | if (ub_get_pipes(sc, sc->dev, intf) != 0) |
| 2216 | goto err_dev_desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | /* |
| 2219 | * At this point, all USB initialization is done, do upper layer. |
| 2220 | * We really hate halfway initialized structures, so from the |
| 2221 | * invariants perspective, this ub_dev is fully constructed at |
| 2222 | * this point. |
| 2223 | */ |
| 2224 | |
| 2225 | /* |
| 2226 | * This is needed to clear toggles. It is a problem only if we do |
| 2227 | * `rmmod ub && modprobe ub` without disconnects, but we like that. |
| 2228 | */ |
Pete Zaitcev | c6c8883 | 2005-09-22 00:49:45 -0700 | [diff] [blame] | 2229 | #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] | 2230 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); |
| 2231 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); |
Pete Zaitcev | c6c8883 | 2005-09-22 00:49:45 -0700 | [diff] [blame] | 2232 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | |
| 2234 | /* |
| 2235 | * The way this is used by the startup code is a little specific. |
| 2236 | * A SCSI check causes a USB stall. Our common case code sees it |
| 2237 | * and clears the check, after which the device is ready for use. |
| 2238 | * But if a check was not present, any command other than |
| 2239 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). |
| 2240 | * |
| 2241 | * If we neglect to clear the SCSI check, the first real command fails |
| 2242 | * (which is the capacity readout). We clear that and retry, but why |
| 2243 | * causing spurious retries for no reason. |
| 2244 | * |
| 2245 | * Revalidation may start with its own TEST_UNIT_READY, but that one |
| 2246 | * has to succeed, so we clear checks with an additional one here. |
| 2247 | * In any case it's not our business how revaliadation is implemented. |
| 2248 | */ |
Pete Zaitcev | b560033 | 2006-05-25 20:08:50 -0700 | [diff] [blame] | 2249 | for (i = 0; i < 3; i++) { /* Retries for the schwag key from KS'04 */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2250 | if ((rc = ub_sync_tur(sc, NULL)) <= 0) break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | if (rc != 0x6) break; |
| 2252 | msleep(10); |
| 2253 | } |
| 2254 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2255 | nluns = 1; |
| 2256 | for (i = 0; i < 3; i++) { |
Pete Zaitcev | 11a223a | 2006-03-02 16:53:00 -0800 | [diff] [blame] | 2257 | if ((rc = ub_sync_getmaxlun(sc)) < 0) |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2258 | break; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2259 | if (rc != 0) { |
| 2260 | nluns = rc; |
| 2261 | break; |
| 2262 | } |
Pete Zaitcev | 9f793d2 | 2005-06-06 13:54:59 -0700 | [diff] [blame] | 2263 | msleep(100); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2264 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2266 | for (i = 0; i < nluns; i++) { |
| 2267 | ub_probe_lun(sc, i); |
| 2268 | } |
| 2269 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2271 | err_dev_desc: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2272 | usb_set_intfdata(intf, NULL); |
Pete Zaitcev | 77ef6c4 | 2006-05-03 00:16:00 -0700 | [diff] [blame] | 2273 | usb_put_intf(sc->intf); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2274 | usb_put_dev(sc->dev); |
| 2275 | kfree(sc); |
| 2276 | err_core: |
| 2277 | return rc; |
| 2278 | } |
| 2279 | |
| 2280 | static int ub_probe_lun(struct ub_dev *sc, int lnum) |
| 2281 | { |
| 2282 | struct ub_lun *lun; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2283 | struct request_queue *q; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2284 | struct gendisk *disk; |
| 2285 | int rc; |
| 2286 | |
| 2287 | rc = -ENOMEM; |
Pete Zaitcev | 29da793 | 2006-02-13 20:35:57 -0800 | [diff] [blame] | 2288 | if ((lun = kzalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL) |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2289 | goto err_alloc; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2290 | lun->num = lnum; |
| 2291 | |
| 2292 | rc = -ENOSR; |
| 2293 | if ((lun->id = ub_id_get()) == -1) |
| 2294 | goto err_id; |
| 2295 | |
| 2296 | lun->udev = sc; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2297 | |
| 2298 | snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)", |
| 2299 | lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num); |
| 2300 | |
| 2301 | lun->removable = 1; /* XXX Query this from the device */ |
| 2302 | lun->changed = 1; /* ub_revalidate clears only */ |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2303 | ub_revalidate(sc, lun); |
| 2304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | rc = -ENOMEM; |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 2306 | if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | goto err_diskalloc; |
| 2308 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2309 | sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | disk->major = UB_MAJOR; |
Pete Zaitcev | 4fb729f | 2005-12-17 02:34:12 -0800 | [diff] [blame] | 2311 | disk->first_minor = lun->id * UB_PARTS_PER_LUN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | disk->fops = &ub_bd_fops; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2313 | disk->private_data = lun; |
Pete Zaitcev | 64bd845 | 2005-09-22 00:48:29 -0700 | [diff] [blame] | 2314 | disk->driverfs_dev = &sc->intf->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | |
| 2316 | rc = -ENOMEM; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2317 | if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | goto err_blkqinit; |
| 2319 | |
| 2320 | disk->queue = q; |
| 2321 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2322 | blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); |
| 2324 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2325 | blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | blk_queue_max_sectors(q, UB_MAX_SECTORS); |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 2327 | blk_queue_logical_block_size(q, lun->capacity.bsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | |
Pete Zaitcev | 688e9fb | 2006-05-25 20:04:54 -0700 | [diff] [blame] | 2329 | lun->disk = disk; |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2330 | q->queuedata = lun; |
Pete Zaitcev | 688e9fb | 2006-05-25 20:04:54 -0700 | [diff] [blame] | 2331 | list_add(&lun->link, &sc->luns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2333 | set_capacity(disk, lun->capacity.nsec); |
| 2334 | if (lun->removable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2335 | disk->flags |= GENHD_FL_REMOVABLE; |
| 2336 | |
| 2337 | add_disk(disk); |
| 2338 | |
| 2339 | return 0; |
| 2340 | |
| 2341 | err_blkqinit: |
| 2342 | put_disk(disk); |
| 2343 | err_diskalloc: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2344 | ub_id_put(lun->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2345 | err_id: |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2346 | kfree(lun); |
| 2347 | err_alloc: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | return rc; |
| 2349 | } |
| 2350 | |
| 2351 | static void ub_disconnect(struct usb_interface *intf) |
| 2352 | { |
| 2353 | struct ub_dev *sc = usb_get_intfdata(intf); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2354 | struct ub_lun *lun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | unsigned long flags; |
| 2356 | |
| 2357 | /* |
| 2358 | * Prevent ub_bd_release from pulling the rug from under us. |
| 2359 | * XXX This is starting to look like a kref. |
| 2360 | * XXX Why not to take this ref at probe time? |
| 2361 | */ |
| 2362 | spin_lock_irqsave(&ub_lock, flags); |
| 2363 | sc->openc++; |
| 2364 | spin_unlock_irqrestore(&ub_lock, flags); |
| 2365 | |
| 2366 | /* |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 2367 | * Fence stall clearings, operations triggered by unlinkings and so on. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2368 | * We do not attempt to unlink any URBs, because we do not trust the |
| 2369 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. |
| 2370 | */ |
| 2371 | atomic_set(&sc->poison, 1); |
| 2372 | |
| 2373 | /* |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2374 | * Wait for reset to end, if any. |
| 2375 | */ |
| 2376 | wait_event(sc->reset_wait, !sc->reset); |
| 2377 | |
| 2378 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | * Blow away queued commands. |
| 2380 | * |
| 2381 | * Actually, this never works, because before we get here |
| 2382 | * the HCD terminates outstanding URB(s). It causes our |
| 2383 | * SCSI command queue to advance, commands fail to submit, |
| 2384 | * and the whole queue drains. So, we just use this code to |
| 2385 | * print warnings. |
| 2386 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2387 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | { |
| 2389 | struct ub_scsi_cmd *cmd; |
| 2390 | int cnt = 0; |
Pete Zaitcev | 2c26c9e | 2005-12-17 02:16:43 -0800 | [diff] [blame] | 2391 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | cmd->error = -ENOTCONN; |
| 2393 | cmd->state = UB_CMDST_DONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | ub_cmdq_pop(sc); |
| 2395 | (*cmd->done)(sc, cmd); |
| 2396 | cnt++; |
| 2397 | } |
| 2398 | if (cnt != 0) { |
| 2399 | printk(KERN_WARNING "%s: " |
| 2400 | "%d was queued after shutdown\n", sc->name, cnt); |
| 2401 | } |
| 2402 | } |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2403 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | |
| 2405 | /* |
| 2406 | * Unregister the upper layer. |
| 2407 | */ |
Matthias Kaehlcke | a69228d | 2007-07-09 12:03:07 -0700 | [diff] [blame] | 2408 | list_for_each_entry(lun, &sc->luns, link) { |
Pete Zaitcev | 688e9fb | 2006-05-25 20:04:54 -0700 | [diff] [blame] | 2409 | del_gendisk(lun->disk); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2410 | /* |
| 2411 | * I wish I could do: |
Nick Piggin | 75ad23b | 2008-04-29 14:48:33 +0200 | [diff] [blame] | 2412 | * queue_flag_set(QUEUE_FLAG_DEAD, q); |
Pete Zaitcev | f480007 | 2005-05-01 16:05:40 -0700 | [diff] [blame] | 2413 | * As it is, we rely on our internal poisoning and let |
| 2414 | * the upper levels to spin furiously failing all the I/O. |
| 2415 | */ |
| 2416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | |
| 2418 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | * Testing for -EINPROGRESS is always a bug, so we are bending |
| 2420 | * the rules a little. |
| 2421 | */ |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2422 | spin_lock_irqsave(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ |
| 2424 | printk(KERN_WARNING "%s: " |
| 2425 | "URB is active after disconnect\n", sc->name); |
| 2426 | } |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2427 | spin_unlock_irqrestore(sc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | |
| 2429 | /* |
Pete Zaitcev | 9029b17 | 2008-04-19 14:45:24 -0700 | [diff] [blame] | 2430 | * There is virtually no chance that other CPU runs a timeout so long |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | * after ub_urb_complete should have called del_timer, but only if HCD |
| 2432 | * didn't forget to deliver a callback on unlink. |
| 2433 | */ |
| 2434 | del_timer_sync(&sc->work_timer); |
| 2435 | |
| 2436 | /* |
| 2437 | * At this point there must be no commands coming from anyone |
| 2438 | * and no URBs left in transit. |
| 2439 | */ |
| 2440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | ub_put(sc); |
| 2442 | } |
| 2443 | |
| 2444 | static struct usb_driver ub_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2445 | .name = "ub", |
| 2446 | .probe = ub_probe, |
| 2447 | .disconnect = ub_disconnect, |
| 2448 | .id_table = ub_usb_ids, |
Pete Zaitcev | d73b7af | 2008-11-10 21:11:11 -0700 | [diff] [blame] | 2449 | .pre_reset = ub_pre_reset, |
| 2450 | .post_reset = ub_post_reset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | }; |
| 2452 | |
| 2453 | static int __init ub_init(void) |
| 2454 | { |
| 2455 | int rc; |
Pete Zaitcev | 65b4fe5 | 2005-12-28 14:22:17 -0800 | [diff] [blame] | 2456 | int i; |
| 2457 | |
| 2458 | for (i = 0; i < UB_QLOCK_NUM; i++) |
| 2459 | spin_lock_init(&ub_qlockv[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) |
| 2462 | goto err_regblkdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | |
| 2464 | if ((rc = usb_register(&ub_driver)) != 0) |
| 2465 | goto err_register; |
| 2466 | |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2467 | usb_usual_set_present(USB_US_TYPE_UB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | return 0; |
| 2469 | |
| 2470 | err_register: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | unregister_blkdev(UB_MAJOR, DRV_NAME); |
| 2472 | err_regblkdev: |
| 2473 | return rc; |
| 2474 | } |
| 2475 | |
| 2476 | static void __exit ub_exit(void) |
| 2477 | { |
| 2478 | usb_deregister(&ub_driver); |
| 2479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | unregister_blkdev(UB_MAJOR, DRV_NAME); |
Pete Zaitcev | a00828e | 2005-10-22 20:15:09 -0700 | [diff] [blame] | 2481 | usb_usual_clear_present(USB_US_TYPE_UB); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | } |
| 2483 | |
| 2484 | module_init(ub_init); |
| 2485 | module_exit(ub_exit); |
| 2486 | |
| 2487 | MODULE_LICENSE("GPL"); |