ide-eh.c revision 734affdcae20af4fec95e46a64fb29f063a15c19
1 2#include <linux/kernel.h> 3#include <linux/ide.h> 4#include <linux/delay.h> 5 6static ide_startstop_t ide_ata_error(ide_drive_t *drive, struct request *rq, 7 u8 stat, u8 err) 8{ 9 ide_hwif_t *hwif = drive->hwif; 10 11 if ((stat & ATA_BUSY) || 12 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { 13 /* other bits are useless when BUSY */ 14 rq->errors |= ERROR_RESET; 15 } else if (stat & ATA_ERR) { 16 /* err has different meaning on cdrom and tape */ 17 if (err == ATA_ABORTED) { 18 if ((drive->dev_flags & IDE_DFLAG_LBA) && 19 /* some newer drives don't support ATA_CMD_INIT_DEV_PARAMS */ 20 hwif->tp_ops->read_status(hwif) == ATA_CMD_INIT_DEV_PARAMS) 21 return ide_stopped; 22 } else if ((err & BAD_CRC) == BAD_CRC) { 23 /* UDMA crc error, just retry the operation */ 24 drive->crc_count++; 25 } else if (err & (ATA_BBK | ATA_UNC)) { 26 /* retries won't help these */ 27 rq->errors = ERROR_MAX; 28 } else if (err & ATA_TRK0NF) { 29 /* help it find track zero */ 30 rq->errors |= ERROR_RECAL; 31 } 32 } 33 34 if ((stat & ATA_DRQ) && rq_data_dir(rq) == READ && 35 (hwif->host_flags & IDE_HFLAG_ERROR_STOPS_FIFO) == 0) { 36 int nsect = drive->mult_count ? drive->mult_count : 1; 37 38 ide_pad_transfer(drive, READ, nsect * SECTOR_SIZE); 39 } 40 41 if (rq->errors >= ERROR_MAX || blk_noretry_request(rq)) { 42 ide_kill_rq(drive, rq); 43 return ide_stopped; 44 } 45 46 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) 47 rq->errors |= ERROR_RESET; 48 49 if ((rq->errors & ERROR_RESET) == ERROR_RESET) { 50 ++rq->errors; 51 return ide_do_reset(drive); 52 } 53 54 if ((rq->errors & ERROR_RECAL) == ERROR_RECAL) 55 drive->special_flags |= IDE_SFLAG_RECALIBRATE; 56 57 ++rq->errors; 58 59 return ide_stopped; 60} 61 62static ide_startstop_t ide_atapi_error(ide_drive_t *drive, struct request *rq, 63 u8 stat, u8 err) 64{ 65 ide_hwif_t *hwif = drive->hwif; 66 67 if ((stat & ATA_BUSY) || 68 ((stat & ATA_DF) && (drive->dev_flags & IDE_DFLAG_NOWERR) == 0)) { 69 /* other bits are useless when BUSY */ 70 rq->errors |= ERROR_RESET; 71 } else { 72 /* add decoding error stuff */ 73 } 74 75 if (hwif->tp_ops->read_status(hwif) & (ATA_BUSY | ATA_DRQ)) 76 /* force an abort */ 77 hwif->tp_ops->exec_command(hwif, ATA_CMD_IDLEIMMEDIATE); 78 79 if (rq->errors >= ERROR_MAX) { 80 ide_kill_rq(drive, rq); 81 } else { 82 if ((rq->errors & ERROR_RESET) == ERROR_RESET) { 83 ++rq->errors; 84 return ide_do_reset(drive); 85 } 86 ++rq->errors; 87 } 88 89 return ide_stopped; 90} 91 92static ide_startstop_t __ide_error(ide_drive_t *drive, struct request *rq, 93 u8 stat, u8 err) 94{ 95 if (drive->media == ide_disk) 96 return ide_ata_error(drive, rq, stat, err); 97 return ide_atapi_error(drive, rq, stat, err); 98} 99 100/** 101 * ide_error - handle an error on the IDE 102 * @drive: drive the error occurred on 103 * @msg: message to report 104 * @stat: status bits 105 * 106 * ide_error() takes action based on the error returned by the drive. 107 * For normal I/O that may well include retries. We deal with 108 * both new-style (taskfile) and old style command handling here. 109 * In the case of taskfile command handling there is work left to 110 * do 111 */ 112 113ide_startstop_t ide_error(ide_drive_t *drive, const char *msg, u8 stat) 114{ 115 struct request *rq; 116 u8 err; 117 118 err = ide_dump_status(drive, msg, stat); 119 120 rq = drive->hwif->rq; 121 if (rq == NULL) 122 return ide_stopped; 123 124 /* retry only "normal" I/O: */ 125 if (!blk_fs_request(rq)) { 126 if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) { 127 struct ide_cmd *cmd = rq->special; 128 129 if (cmd) 130 ide_complete_cmd(drive, cmd, stat, err); 131 } else if (blk_pm_request(rq)) { 132 rq->errors = 1; 133 ide_complete_pm_rq(drive, rq); 134 return ide_stopped; 135 } 136 rq->errors = err; 137 ide_complete_rq(drive, err ? -EIO : 0, blk_rq_bytes(rq)); 138 return ide_stopped; 139 } 140 141 return __ide_error(drive, rq, stat, err); 142} 143EXPORT_SYMBOL_GPL(ide_error); 144 145static inline void ide_complete_drive_reset(ide_drive_t *drive, int err) 146{ 147 struct request *rq = drive->hwif->rq; 148 149 if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET) { 150 if (err <= 0 && rq->errors == 0) 151 rq->errors = -EIO; 152 ide_complete_rq(drive, err ? err : 0, ide_rq_bytes(rq)); 153 } 154} 155 156/* needed below */ 157static ide_startstop_t do_reset1(ide_drive_t *, int); 158 159/* 160 * atapi_reset_pollfunc() gets invoked to poll the interface for completion 161 * every 50ms during an atapi drive reset operation. If the drive has not yet 162 * responded, and we have not yet hit our maximum waiting time, then the timer 163 * is restarted for another 50ms. 164 */ 165static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive) 166{ 167 ide_hwif_t *hwif = drive->hwif; 168 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 169 u8 stat; 170 171 tp_ops->dev_select(drive); 172 udelay(10); 173 stat = tp_ops->read_status(hwif); 174 175 if (OK_STAT(stat, 0, ATA_BUSY)) 176 printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name); 177 else { 178 if (time_before(jiffies, hwif->poll_timeout)) { 179 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); 180 /* continue polling */ 181 return ide_started; 182 } 183 /* end of polling */ 184 hwif->polling = 0; 185 printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n", 186 drive->name, stat); 187 /* do it the old fashioned way */ 188 return do_reset1(drive, 1); 189 } 190 /* done polling */ 191 hwif->polling = 0; 192 ide_complete_drive_reset(drive, 0); 193 return ide_stopped; 194} 195 196static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) 197{ 198 static const char *err_master_vals[] = 199 { NULL, "passed", "formatter device error", 200 "sector buffer error", "ECC circuitry error", 201 "controlling MPU error" }; 202 203 u8 err_master = err & 0x7f; 204 205 printk(KERN_ERR "%s: reset: master: ", hwif->name); 206 if (err_master && err_master < 6) 207 printk(KERN_CONT "%s", err_master_vals[err_master]); 208 else 209 printk(KERN_CONT "error (0x%02x?)", err); 210 if (err & 0x80) 211 printk(KERN_CONT "; slave: failed"); 212 printk(KERN_CONT "\n"); 213} 214 215/* 216 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms 217 * during an ide reset operation. If the drives have not yet responded, 218 * and we have not yet hit our maximum waiting time, then the timer is restarted 219 * for another 50ms. 220 */ 221static ide_startstop_t reset_pollfunc(ide_drive_t *drive) 222{ 223 ide_hwif_t *hwif = drive->hwif; 224 const struct ide_port_ops *port_ops = hwif->port_ops; 225 u8 tmp; 226 int err = 0; 227 228 if (port_ops && port_ops->reset_poll) { 229 err = port_ops->reset_poll(drive); 230 if (err) { 231 printk(KERN_ERR "%s: host reset_poll failure for %s.\n", 232 hwif->name, drive->name); 233 goto out; 234 } 235 } 236 237 tmp = hwif->tp_ops->read_status(hwif); 238 239 if (!OK_STAT(tmp, 0, ATA_BUSY)) { 240 if (time_before(jiffies, hwif->poll_timeout)) { 241 ide_set_handler(drive, &reset_pollfunc, HZ/20); 242 /* continue polling */ 243 return ide_started; 244 } 245 printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n", 246 hwif->name, tmp); 247 drive->failures++; 248 err = -EIO; 249 } else { 250 tmp = ide_read_error(drive); 251 252 if (tmp == 1) { 253 printk(KERN_INFO "%s: reset: success\n", hwif->name); 254 drive->failures = 0; 255 } else { 256 ide_reset_report_error(hwif, tmp); 257 drive->failures++; 258 err = -EIO; 259 } 260 } 261out: 262 hwif->polling = 0; /* done polling */ 263 ide_complete_drive_reset(drive, err); 264 return ide_stopped; 265} 266 267static void ide_disk_pre_reset(ide_drive_t *drive) 268{ 269 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; 270 271 drive->special_flags = 272 legacy ? (IDE_SFLAG_SET_GEOMETRY | IDE_SFLAG_RECALIBRATE) : 0; 273 274 drive->mult_count = 0; 275 drive->dev_flags &= ~IDE_DFLAG_PARKED; 276 277 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && 278 (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) 279 drive->mult_req = 0; 280 281 if (drive->mult_req != drive->mult_count) 282 drive->special_flags |= IDE_SFLAG_SET_MULTMODE; 283} 284 285static void pre_reset(ide_drive_t *drive) 286{ 287 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 288 289 if (drive->media == ide_disk) 290 ide_disk_pre_reset(drive); 291 else 292 drive->dev_flags |= IDE_DFLAG_POST_RESET; 293 294 if (drive->dev_flags & IDE_DFLAG_USING_DMA) { 295 if (drive->crc_count) 296 ide_check_dma_crc(drive); 297 else 298 ide_dma_off(drive); 299 } 300 301 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { 302 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { 303 drive->dev_flags &= ~IDE_DFLAG_UNMASK; 304 drive->io_32bit = 0; 305 } 306 return; 307 } 308 309 if (port_ops && port_ops->pre_reset) 310 port_ops->pre_reset(drive); 311 312 if (drive->current_speed != 0xff) 313 drive->desired_speed = drive->current_speed; 314 drive->current_speed = 0xff; 315} 316 317/* 318 * do_reset1() attempts to recover a confused drive by resetting it. 319 * Unfortunately, resetting a disk drive actually resets all devices on 320 * the same interface, so it can really be thought of as resetting the 321 * interface rather than resetting the drive. 322 * 323 * ATAPI devices have their own reset mechanism which allows them to be 324 * individually reset without clobbering other devices on the same interface. 325 * 326 * Unfortunately, the IDE interface does not generate an interrupt to let 327 * us know when the reset operation has finished, so we must poll for this. 328 * Equally poor, though, is the fact that this may a very long time to complete, 329 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, 330 * we set a timer to poll at 50ms intervals. 331 */ 332static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi) 333{ 334 ide_hwif_t *hwif = drive->hwif; 335 struct ide_io_ports *io_ports = &hwif->io_ports; 336 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 337 const struct ide_port_ops *port_ops; 338 ide_drive_t *tdrive; 339 unsigned long flags, timeout; 340 int i; 341 DEFINE_WAIT(wait); 342 343 spin_lock_irqsave(&hwif->lock, flags); 344 345 /* We must not reset with running handlers */ 346 BUG_ON(hwif->handler != NULL); 347 348 /* For an ATAPI device, first try an ATAPI SRST. */ 349 if (drive->media != ide_disk && !do_not_try_atapi) { 350 pre_reset(drive); 351 tp_ops->dev_select(drive); 352 udelay(20); 353 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); 354 ndelay(400); 355 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 356 hwif->polling = 1; 357 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20); 358 spin_unlock_irqrestore(&hwif->lock, flags); 359 return ide_started; 360 } 361 362 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */ 363 do { 364 unsigned long now; 365 366 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); 367 timeout = jiffies; 368 ide_port_for_each_present_dev(i, tdrive, hwif) { 369 if ((tdrive->dev_flags & IDE_DFLAG_PARKED) && 370 time_after(tdrive->sleep, timeout)) 371 timeout = tdrive->sleep; 372 } 373 374 now = jiffies; 375 if (time_before_eq(timeout, now)) 376 break; 377 378 spin_unlock_irqrestore(&hwif->lock, flags); 379 timeout = schedule_timeout_uninterruptible(timeout - now); 380 spin_lock_irqsave(&hwif->lock, flags); 381 } while (timeout); 382 finish_wait(&ide_park_wq, &wait); 383 384 /* 385 * First, reset any device state data we were maintaining 386 * for any of the drives on this interface. 387 */ 388 ide_port_for_each_dev(i, tdrive, hwif) 389 pre_reset(tdrive); 390 391 if (io_ports->ctl_addr == 0) { 392 spin_unlock_irqrestore(&hwif->lock, flags); 393 ide_complete_drive_reset(drive, -ENXIO); 394 return ide_stopped; 395 } 396 397 /* 398 * Note that we also set nIEN while resetting the device, 399 * to mask unwanted interrupts from the interface during the reset. 400 * However, due to the design of PC hardware, this will cause an 401 * immediate interrupt due to the edge transition it produces. 402 * This single interrupt gives us a "fast poll" for drives that 403 * recover from reset very quickly, saving us the first 50ms wait time. 404 */ 405 /* set SRST and nIEN */ 406 tp_ops->write_devctl(hwif, ATA_SRST | ATA_NIEN | ATA_DEVCTL_OBS); 407 /* more than enough time */ 408 udelay(10); 409 /* clear SRST, leave nIEN (unless device is on the quirk list) */ 410 tp_ops->write_devctl(hwif, 411 ((drive->dev_flags & IDE_DFLAG_NIEN_QUIRK) ? 0 : ATA_NIEN) | 412 ATA_DEVCTL_OBS); 413 /* more than enough time */ 414 udelay(10); 415 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 416 hwif->polling = 1; 417 __ide_set_handler(drive, &reset_pollfunc, HZ/20); 418 419 /* 420 * Some weird controller like resetting themselves to a strange 421 * state when the disks are reset this way. At least, the Winbond 422 * 553 documentation says that 423 */ 424 port_ops = hwif->port_ops; 425 if (port_ops && port_ops->resetproc) 426 port_ops->resetproc(drive); 427 428 spin_unlock_irqrestore(&hwif->lock, flags); 429 return ide_started; 430} 431 432/* 433 * ide_do_reset() is the entry point to the drive/interface reset code. 434 */ 435 436ide_startstop_t ide_do_reset(ide_drive_t *drive) 437{ 438 return do_reset1(drive, 0); 439} 440EXPORT_SYMBOL(ide_do_reset); 441