ide-eh.c revision 6902a5331256e1b9f4cef95a1e3622252113b260
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.b.recalibrate = 1; 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); 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 ide_end_request(drive, err ? err : 1, 0); 151} 152 153/* needed below */ 154static ide_startstop_t do_reset1(ide_drive_t *, int); 155 156/* 157 * atapi_reset_pollfunc() gets invoked to poll the interface for completion 158 * every 50ms during an atapi drive reset operation. If the drive has not yet 159 * responded, and we have not yet hit our maximum waiting time, then the timer 160 * is restarted for another 50ms. 161 */ 162static ide_startstop_t atapi_reset_pollfunc(ide_drive_t *drive) 163{ 164 ide_hwif_t *hwif = drive->hwif; 165 u8 stat; 166 167 SELECT_DRIVE(drive); 168 udelay(10); 169 stat = hwif->tp_ops->read_status(hwif); 170 171 if (OK_STAT(stat, 0, ATA_BUSY)) 172 printk(KERN_INFO "%s: ATAPI reset complete\n", drive->name); 173 else { 174 if (time_before(jiffies, hwif->poll_timeout)) { 175 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, 176 NULL); 177 /* continue polling */ 178 return ide_started; 179 } 180 /* end of polling */ 181 hwif->polling = 0; 182 printk(KERN_ERR "%s: ATAPI reset timed-out, status=0x%02x\n", 183 drive->name, stat); 184 /* do it the old fashioned way */ 185 return do_reset1(drive, 1); 186 } 187 /* done polling */ 188 hwif->polling = 0; 189 ide_complete_drive_reset(drive, 0); 190 return ide_stopped; 191} 192 193static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) 194{ 195 static const char *err_master_vals[] = 196 { NULL, "passed", "formatter device error", 197 "sector buffer error", "ECC circuitry error", 198 "controlling MPU error" }; 199 200 u8 err_master = err & 0x7f; 201 202 printk(KERN_ERR "%s: reset: master: ", hwif->name); 203 if (err_master && err_master < 6) 204 printk(KERN_CONT "%s", err_master_vals[err_master]); 205 else 206 printk(KERN_CONT "error (0x%02x?)", err); 207 if (err & 0x80) 208 printk(KERN_CONT "; slave: failed"); 209 printk(KERN_CONT "\n"); 210} 211 212/* 213 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms 214 * during an ide reset operation. If the drives have not yet responded, 215 * and we have not yet hit our maximum waiting time, then the timer is restarted 216 * for another 50ms. 217 */ 218static ide_startstop_t reset_pollfunc(ide_drive_t *drive) 219{ 220 ide_hwif_t *hwif = drive->hwif; 221 const struct ide_port_ops *port_ops = hwif->port_ops; 222 u8 tmp; 223 int err = 0; 224 225 if (port_ops && port_ops->reset_poll) { 226 err = port_ops->reset_poll(drive); 227 if (err) { 228 printk(KERN_ERR "%s: host reset_poll failure for %s.\n", 229 hwif->name, drive->name); 230 goto out; 231 } 232 } 233 234 tmp = hwif->tp_ops->read_status(hwif); 235 236 if (!OK_STAT(tmp, 0, ATA_BUSY)) { 237 if (time_before(jiffies, hwif->poll_timeout)) { 238 ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 239 /* continue polling */ 240 return ide_started; 241 } 242 printk(KERN_ERR "%s: reset timed-out, status=0x%02x\n", 243 hwif->name, tmp); 244 drive->failures++; 245 err = -EIO; 246 } else { 247 tmp = ide_read_error(drive); 248 249 if (tmp == 1) { 250 printk(KERN_INFO "%s: reset: success\n", hwif->name); 251 drive->failures = 0; 252 } else { 253 ide_reset_report_error(hwif, tmp); 254 drive->failures++; 255 err = -EIO; 256 } 257 } 258out: 259 hwif->polling = 0; /* done polling */ 260 ide_complete_drive_reset(drive, err); 261 return ide_stopped; 262} 263 264static void ide_disk_pre_reset(ide_drive_t *drive) 265{ 266 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; 267 268 drive->special.all = 0; 269 drive->special.b.set_geometry = legacy; 270 drive->special.b.recalibrate = legacy; 271 272 drive->mult_count = 0; 273 drive->dev_flags &= ~IDE_DFLAG_PARKED; 274 275 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && 276 (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) 277 drive->mult_req = 0; 278 279 if (drive->mult_req != drive->mult_count) 280 drive->special.b.set_multmode = 1; 281} 282 283static void pre_reset(ide_drive_t *drive) 284{ 285 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 286 287 if (drive->media == ide_disk) 288 ide_disk_pre_reset(drive); 289 else 290 drive->dev_flags |= IDE_DFLAG_POST_RESET; 291 292 if (drive->dev_flags & IDE_DFLAG_USING_DMA) { 293 if (drive->crc_count) 294 ide_check_dma_crc(drive); 295 else 296 ide_dma_off(drive); 297 } 298 299 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { 300 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { 301 drive->dev_flags &= ~IDE_DFLAG_UNMASK; 302 drive->io_32bit = 0; 303 } 304 return; 305 } 306 307 if (port_ops && port_ops->pre_reset) 308 port_ops->pre_reset(drive); 309 310 if (drive->current_speed != 0xff) 311 drive->desired_speed = drive->current_speed; 312 drive->current_speed = 0xff; 313} 314 315/* 316 * do_reset1() attempts to recover a confused drive by resetting it. 317 * Unfortunately, resetting a disk drive actually resets all devices on 318 * the same interface, so it can really be thought of as resetting the 319 * interface rather than resetting the drive. 320 * 321 * ATAPI devices have their own reset mechanism which allows them to be 322 * individually reset without clobbering other devices on the same interface. 323 * 324 * Unfortunately, the IDE interface does not generate an interrupt to let 325 * us know when the reset operation has finished, so we must poll for this. 326 * Equally poor, though, is the fact that this may a very long time to complete, 327 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, 328 * we set a timer to poll at 50ms intervals. 329 */ 330static ide_startstop_t do_reset1(ide_drive_t *drive, int do_not_try_atapi) 331{ 332 ide_hwif_t *hwif = drive->hwif; 333 struct ide_io_ports *io_ports = &hwif->io_ports; 334 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 335 const struct ide_port_ops *port_ops; 336 ide_drive_t *tdrive; 337 unsigned long flags, timeout; 338 int i; 339 DEFINE_WAIT(wait); 340 341 spin_lock_irqsave(&hwif->lock, flags); 342 343 /* We must not reset with running handlers */ 344 BUG_ON(hwif->handler != NULL); 345 346 /* For an ATAPI device, first try an ATAPI SRST. */ 347 if (drive->media != ide_disk && !do_not_try_atapi) { 348 pre_reset(drive); 349 SELECT_DRIVE(drive); 350 udelay(20); 351 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); 352 ndelay(400); 353 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 354 hwif->polling = 1; 355 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); 356 spin_unlock_irqrestore(&hwif->lock, flags); 357 return ide_started; 358 } 359 360 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */ 361 do { 362 unsigned long now; 363 364 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); 365 timeout = jiffies; 366 ide_port_for_each_present_dev(i, tdrive, hwif) { 367 if ((tdrive->dev_flags & IDE_DFLAG_PARKED) && 368 time_after(tdrive->sleep, timeout)) 369 timeout = tdrive->sleep; 370 } 371 372 now = jiffies; 373 if (time_before_eq(timeout, now)) 374 break; 375 376 spin_unlock_irqrestore(&hwif->lock, flags); 377 timeout = schedule_timeout_uninterruptible(timeout - now); 378 spin_lock_irqsave(&hwif->lock, flags); 379 } while (timeout); 380 finish_wait(&ide_park_wq, &wait); 381 382 /* 383 * First, reset any device state data we were maintaining 384 * for any of the drives on this interface. 385 */ 386 ide_port_for_each_dev(i, tdrive, hwif) 387 pre_reset(tdrive); 388 389 if (io_ports->ctl_addr == 0) { 390 spin_unlock_irqrestore(&hwif->lock, flags); 391 ide_complete_drive_reset(drive, -ENXIO); 392 return ide_stopped; 393 } 394 395 /* 396 * Note that we also set nIEN while resetting the device, 397 * to mask unwanted interrupts from the interface during the reset. 398 * However, due to the design of PC hardware, this will cause an 399 * immediate interrupt due to the edge transition it produces. 400 * This single interrupt gives us a "fast poll" for drives that 401 * recover from reset very quickly, saving us the first 50ms wait time. 402 * 403 * TODO: add ->softreset method and stop abusing ->set_irq 404 */ 405 /* set SRST and nIEN */ 406 tp_ops->set_irq(hwif, 4); 407 /* more than enough time */ 408 udelay(10); 409 /* clear SRST, leave nIEN (unless device is on the quirk list) */ 410 tp_ops->set_irq(hwif, drive->quirk_list == 2); 411 /* more than enough time */ 412 udelay(10); 413 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 414 hwif->polling = 1; 415 __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 416 417 /* 418 * Some weird controller like resetting themselves to a strange 419 * state when the disks are reset this way. At least, the Winbond 420 * 553 documentation says that 421 */ 422 port_ops = hwif->port_ops; 423 if (port_ops && port_ops->resetproc) 424 port_ops->resetproc(drive); 425 426 spin_unlock_irqrestore(&hwif->lock, flags); 427 return ide_started; 428} 429 430/* 431 * ide_do_reset() is the entry point to the drive/interface reset code. 432 */ 433 434ide_startstop_t ide_do_reset(ide_drive_t *drive) 435{ 436 return do_reset1(drive, 0); 437} 438EXPORT_SYMBOL(ide_do_reset); 439