Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 1 | /* |
| 2 | * libata-eh.c - libata error handling |
| 3 | * |
| 4 | * Maintained by: Jeff Garzik <jgarzik@pobox.com> |
| 5 | * Please ALWAYS copy linux-ide@vger.kernel.org |
| 6 | * on emails. |
| 7 | * |
| 8 | * Copyright 2006 Tejun Heo <htejun@gmail.com> |
| 9 | * |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | * General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; see the file COPYING. If not, write to |
| 23 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, |
| 24 | * USA. |
| 25 | * |
| 26 | * |
| 27 | * libata documentation is available via 'make {ps|pdf}docs', |
| 28 | * as Documentation/DocBook/libata.* |
| 29 | * |
| 30 | * Hardware documentation available from http://www.t13.org/ and |
| 31 | * http://www.sata-io.org/ |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | #include <linux/config.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <scsi/scsi.h> |
| 38 | #include <scsi/scsi_host.h> |
| 39 | #include <scsi/scsi_eh.h> |
| 40 | #include <scsi/scsi_device.h> |
| 41 | #include <scsi/scsi_cmnd.h> |
| 42 | |
| 43 | #include <linux/libata.h> |
| 44 | |
| 45 | #include "libata.h" |
| 46 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 47 | static void __ata_port_freeze(struct ata_port *ap); |
| 48 | |
Tejun Heo | 0c247c5 | 2006-05-15 20:58:19 +0900 | [diff] [blame] | 49 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
| 50 | unsigned int err_mask) |
| 51 | { |
| 52 | struct ata_ering_entry *ent; |
| 53 | |
| 54 | WARN_ON(!err_mask); |
| 55 | |
| 56 | ering->cursor++; |
| 57 | ering->cursor %= ATA_ERING_SIZE; |
| 58 | |
| 59 | ent = &ering->ring[ering->cursor]; |
| 60 | ent->is_io = is_io; |
| 61 | ent->err_mask = err_mask; |
| 62 | ent->timestamp = get_jiffies_64(); |
| 63 | } |
| 64 | |
| 65 | static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering) |
| 66 | { |
| 67 | struct ata_ering_entry *ent = &ering->ring[ering->cursor]; |
| 68 | if (!ent->err_mask) |
| 69 | return NULL; |
| 70 | return ent; |
| 71 | } |
| 72 | |
| 73 | static int ata_ering_map(struct ata_ering *ering, |
| 74 | int (*map_fn)(struct ata_ering_entry *, void *), |
| 75 | void *arg) |
| 76 | { |
| 77 | int idx, rc = 0; |
| 78 | struct ata_ering_entry *ent; |
| 79 | |
| 80 | idx = ering->cursor; |
| 81 | do { |
| 82 | ent = &ering->ring[idx]; |
| 83 | if (!ent->err_mask) |
| 84 | break; |
| 85 | rc = map_fn(ent, arg); |
| 86 | if (rc) |
| 87 | break; |
| 88 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; |
| 89 | } while (idx != ering->cursor); |
| 90 | |
| 91 | return rc; |
| 92 | } |
| 93 | |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 94 | /** |
| 95 | * ata_scsi_timed_out - SCSI layer time out callback |
| 96 | * @cmd: timed out SCSI command |
| 97 | * |
| 98 | * Handles SCSI layer timeout. We race with normal completion of |
| 99 | * the qc for @cmd. If the qc is already gone, we lose and let |
| 100 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has |
| 101 | * timed out and EH should be invoked. Prevent ata_qc_complete() |
| 102 | * from finishing it by setting EH_SCHEDULED and return |
| 103 | * EH_NOT_HANDLED. |
| 104 | * |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 105 | * TODO: kill this function once old EH is gone. |
| 106 | * |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 107 | * LOCKING: |
| 108 | * Called from timer context |
| 109 | * |
| 110 | * RETURNS: |
| 111 | * EH_HANDLED or EH_NOT_HANDLED |
| 112 | */ |
| 113 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) |
| 114 | { |
| 115 | struct Scsi_Host *host = cmd->device->host; |
Jeff Garzik | 35bb94b | 2006-04-11 13:12:34 -0400 | [diff] [blame] | 116 | struct ata_port *ap = ata_shost_to_port(host); |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 117 | unsigned long flags; |
| 118 | struct ata_queued_cmd *qc; |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 119 | enum scsi_eh_timer_return ret; |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 120 | |
| 121 | DPRINTK("ENTER\n"); |
| 122 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 123 | if (ap->ops->error_handler) { |
| 124 | ret = EH_NOT_HANDLED; |
| 125 | goto out; |
| 126 | } |
| 127 | |
| 128 | ret = EH_HANDLED; |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 129 | spin_lock_irqsave(&ap->host_set->lock, flags); |
| 130 | qc = ata_qc_from_tag(ap, ap->active_tag); |
| 131 | if (qc) { |
| 132 | WARN_ON(qc->scsicmd != cmd); |
| 133 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; |
| 134 | qc->err_mask |= AC_ERR_TIMEOUT; |
| 135 | ret = EH_NOT_HANDLED; |
| 136 | } |
| 137 | spin_unlock_irqrestore(&ap->host_set->lock, flags); |
| 138 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 139 | out: |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 140 | DPRINTK("EXIT, ret=%d\n", ret); |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * ata_scsi_error - SCSI layer error handler callback |
| 146 | * @host: SCSI host on which error occurred |
| 147 | * |
| 148 | * Handles SCSI-layer-thrown error events. |
| 149 | * |
| 150 | * LOCKING: |
| 151 | * Inherited from SCSI layer (none, can sleep) |
| 152 | * |
| 153 | * RETURNS: |
| 154 | * Zero. |
| 155 | */ |
Jeff Garzik | 381544b | 2006-04-11 13:04:39 -0400 | [diff] [blame] | 156 | void ata_scsi_error(struct Scsi_Host *host) |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 157 | { |
Jeff Garzik | 35bb94b | 2006-04-11 13:12:34 -0400 | [diff] [blame] | 158 | struct ata_port *ap = ata_shost_to_port(host); |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 159 | spinlock_t *hs_lock = &ap->host_set->lock; |
| 160 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
| 161 | unsigned long flags; |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 162 | |
| 163 | DPRINTK("ENTER\n"); |
| 164 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 165 | /* synchronize with port task */ |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 166 | ata_port_flush_task(ap); |
| 167 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 168 | /* synchronize with host_set lock and sort out timeouts */ |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 169 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 170 | /* For new EH, all qcs are finished in one of three ways - |
| 171 | * normal completion, error completion, and SCSI timeout. |
| 172 | * Both cmpletions can race against SCSI timeout. When normal |
| 173 | * completion wins, the qc never reaches EH. When error |
| 174 | * completion wins, the qc has ATA_QCFLAG_FAILED set. |
| 175 | * |
| 176 | * When SCSI timeout wins, things are a bit more complex. |
| 177 | * Normal or error completion can occur after the timeout but |
| 178 | * before this point. In such cases, both types of |
| 179 | * completions are honored. A scmd is determined to have |
| 180 | * timed out iff its associated qc is active and not failed. |
| 181 | */ |
| 182 | if (ap->ops->error_handler) { |
| 183 | struct scsi_cmnd *scmd, *tmp; |
| 184 | int nr_timedout = 0; |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 185 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 186 | spin_lock_irqsave(hs_lock, flags); |
| 187 | |
| 188 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { |
| 189 | struct ata_queued_cmd *qc; |
| 190 | |
| 191 | for (i = 0; i < ATA_MAX_QUEUE; i++) { |
| 192 | qc = __ata_qc_from_tag(ap, i); |
| 193 | if (qc->flags & ATA_QCFLAG_ACTIVE && |
| 194 | qc->scsicmd == scmd) |
| 195 | break; |
| 196 | } |
| 197 | |
| 198 | if (i < ATA_MAX_QUEUE) { |
| 199 | /* the scmd has an associated qc */ |
| 200 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { |
| 201 | /* which hasn't failed yet, timeout */ |
| 202 | qc->err_mask |= AC_ERR_TIMEOUT; |
| 203 | qc->flags |= ATA_QCFLAG_FAILED; |
| 204 | nr_timedout++; |
| 205 | } |
| 206 | } else { |
| 207 | /* Normal completion occurred after |
| 208 | * SCSI timeout but before this point. |
| 209 | * Successfully complete it. |
| 210 | */ |
| 211 | scmd->retries = scmd->allowed; |
| 212 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /* If we have timed out qcs. They belong to EH from |
| 217 | * this point but the state of the controller is |
| 218 | * unknown. Freeze the port to make sure the IRQ |
| 219 | * handler doesn't diddle with those qcs. This must |
| 220 | * be done atomically w.r.t. setting QCFLAG_FAILED. |
| 221 | */ |
| 222 | if (nr_timedout) |
| 223 | __ata_port_freeze(ap); |
| 224 | |
| 225 | spin_unlock_irqrestore(hs_lock, flags); |
| 226 | } else |
| 227 | spin_unlock_wait(hs_lock); |
| 228 | |
| 229 | repeat: |
| 230 | /* invoke error handler */ |
| 231 | if (ap->ops->error_handler) { |
Tejun Heo | f3e81b1 | 2006-05-15 20:58:21 +0900 | [diff] [blame^] | 232 | /* fetch & clear EH info */ |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 233 | spin_lock_irqsave(hs_lock, flags); |
Tejun Heo | f3e81b1 | 2006-05-15 20:58:21 +0900 | [diff] [blame^] | 234 | |
| 235 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); |
| 236 | ap->eh_context.i = ap->eh_info; |
| 237 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); |
| 238 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 239 | ap->flags &= ~ATA_FLAG_EH_PENDING; |
Tejun Heo | f3e81b1 | 2006-05-15 20:58:21 +0900 | [diff] [blame^] | 240 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 241 | spin_unlock_irqrestore(hs_lock, flags); |
| 242 | |
| 243 | /* invoke EH */ |
| 244 | ap->ops->error_handler(ap); |
| 245 | |
| 246 | /* Exception might have happend after ->error_handler |
| 247 | * recovered the port but before this point. Repeat |
| 248 | * EH in such case. |
| 249 | */ |
| 250 | spin_lock_irqsave(hs_lock, flags); |
| 251 | |
| 252 | if (ap->flags & ATA_FLAG_EH_PENDING) { |
| 253 | if (--repeat_cnt) { |
| 254 | ata_port_printk(ap, KERN_INFO, |
| 255 | "EH pending after completion, " |
| 256 | "repeating EH (cnt=%d)\n", repeat_cnt); |
| 257 | spin_unlock_irqrestore(hs_lock, flags); |
| 258 | goto repeat; |
| 259 | } |
| 260 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " |
| 261 | "tries, giving up\n", ATA_EH_MAX_REPEAT); |
| 262 | } |
| 263 | |
Tejun Heo | f3e81b1 | 2006-05-15 20:58:21 +0900 | [diff] [blame^] | 264 | /* this run is complete, make sure EH info is clear */ |
| 265 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); |
| 266 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 267 | /* Clear host_eh_scheduled while holding hs_lock such |
| 268 | * that if exception occurs after this point but |
| 269 | * before EH completion, SCSI midlayer will |
| 270 | * re-initiate EH. |
| 271 | */ |
| 272 | host->host_eh_scheduled = 0; |
| 273 | |
| 274 | spin_unlock_irqrestore(hs_lock, flags); |
| 275 | } else { |
| 276 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); |
| 277 | ap->ops->eng_timeout(ap); |
| 278 | } |
| 279 | |
| 280 | /* finish or retry handled scmd's and clean up */ |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 281 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
| 282 | |
| 283 | scsi_eh_flush_done_q(&ap->eh_done_q); |
| 284 | |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 285 | /* clean up */ |
| 286 | spin_lock_irqsave(hs_lock, flags); |
| 287 | |
| 288 | if (ap->flags & ATA_FLAG_RECOVERED) |
| 289 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); |
| 290 | ap->flags &= ~ATA_FLAG_RECOVERED; |
| 291 | |
| 292 | spin_unlock_irqrestore(hs_lock, flags); |
| 293 | |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 294 | DPRINTK("EXIT\n"); |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | /** |
| 298 | * ata_qc_timeout - Handle timeout of queued command |
| 299 | * @qc: Command that timed out |
| 300 | * |
| 301 | * Some part of the kernel (currently, only the SCSI layer) |
| 302 | * has noticed that the active command on port @ap has not |
| 303 | * completed after a specified length of time. Handle this |
| 304 | * condition by disabling DMA (if necessary) and completing |
| 305 | * transactions, with error if necessary. |
| 306 | * |
| 307 | * This also handles the case of the "lost interrupt", where |
| 308 | * for some reason (possibly hardware bug, possibly driver bug) |
| 309 | * an interrupt was not delivered to the driver, even though the |
| 310 | * transaction completed successfully. |
| 311 | * |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 312 | * TODO: kill this function once old EH is gone. |
| 313 | * |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 314 | * LOCKING: |
| 315 | * Inherited from SCSI layer (none, can sleep) |
| 316 | */ |
| 317 | static void ata_qc_timeout(struct ata_queued_cmd *qc) |
| 318 | { |
| 319 | struct ata_port *ap = qc->ap; |
| 320 | struct ata_host_set *host_set = ap->host_set; |
| 321 | u8 host_stat = 0, drv_stat; |
| 322 | unsigned long flags; |
| 323 | |
| 324 | DPRINTK("ENTER\n"); |
| 325 | |
| 326 | ap->hsm_task_state = HSM_ST_IDLE; |
| 327 | |
| 328 | spin_lock_irqsave(&host_set->lock, flags); |
| 329 | |
| 330 | switch (qc->tf.protocol) { |
| 331 | |
| 332 | case ATA_PROT_DMA: |
| 333 | case ATA_PROT_ATAPI_DMA: |
| 334 | host_stat = ap->ops->bmdma_status(ap); |
| 335 | |
| 336 | /* before we do anything else, clear DMA-Start bit */ |
| 337 | ap->ops->bmdma_stop(qc); |
| 338 | |
| 339 | /* fall through */ |
| 340 | |
| 341 | default: |
| 342 | ata_altstatus(ap); |
| 343 | drv_stat = ata_chk_status(ap); |
| 344 | |
| 345 | /* ack bmdma irq events */ |
| 346 | ap->ops->irq_clear(ap); |
| 347 | |
Tejun Heo | f15a1da | 2006-05-15 20:57:56 +0900 | [diff] [blame] | 348 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
| 349 | "stat 0x%x host_stat 0x%x\n", |
| 350 | qc->tf.command, drv_stat, host_stat); |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 351 | |
| 352 | /* complete taskfile transaction */ |
| 353 | qc->err_mask |= ac_err_mask(drv_stat); |
| 354 | break; |
| 355 | } |
| 356 | |
| 357 | spin_unlock_irqrestore(&host_set->lock, flags); |
| 358 | |
| 359 | ata_eh_qc_complete(qc); |
| 360 | |
| 361 | DPRINTK("EXIT\n"); |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * ata_eng_timeout - Handle timeout of queued command |
| 366 | * @ap: Port on which timed-out command is active |
| 367 | * |
| 368 | * Some part of the kernel (currently, only the SCSI layer) |
| 369 | * has noticed that the active command on port @ap has not |
| 370 | * completed after a specified length of time. Handle this |
| 371 | * condition by disabling DMA (if necessary) and completing |
| 372 | * transactions, with error if necessary. |
| 373 | * |
| 374 | * This also handles the case of the "lost interrupt", where |
| 375 | * for some reason (possibly hardware bug, possibly driver bug) |
| 376 | * an interrupt was not delivered to the driver, even though the |
| 377 | * transaction completed successfully. |
| 378 | * |
Tejun Heo | ad9e276 | 2006-05-15 20:58:12 +0900 | [diff] [blame] | 379 | * TODO: kill this function once old EH is gone. |
| 380 | * |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 381 | * LOCKING: |
| 382 | * Inherited from SCSI layer (none, can sleep) |
| 383 | */ |
| 384 | void ata_eng_timeout(struct ata_port *ap) |
| 385 | { |
| 386 | DPRINTK("ENTER\n"); |
| 387 | |
| 388 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); |
| 389 | |
| 390 | DPRINTK("EXIT\n"); |
| 391 | } |
| 392 | |
Tejun Heo | f686bcb | 2006-05-15 20:58:05 +0900 | [diff] [blame] | 393 | /** |
| 394 | * ata_qc_schedule_eh - schedule qc for error handling |
| 395 | * @qc: command to schedule error handling for |
| 396 | * |
| 397 | * Schedule error handling for @qc. EH will kick in as soon as |
| 398 | * other commands are drained. |
| 399 | * |
| 400 | * LOCKING: |
| 401 | * spin_lock_irqsave(host_set lock) |
| 402 | */ |
| 403 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) |
| 404 | { |
| 405 | struct ata_port *ap = qc->ap; |
| 406 | |
| 407 | WARN_ON(!ap->ops->error_handler); |
| 408 | |
| 409 | qc->flags |= ATA_QCFLAG_FAILED; |
| 410 | qc->ap->flags |= ATA_FLAG_EH_PENDING; |
| 411 | |
| 412 | /* The following will fail if timeout has already expired. |
| 413 | * ata_scsi_error() takes care of such scmds on EH entry. |
| 414 | * Note that ATA_QCFLAG_FAILED is unconditionally set after |
| 415 | * this function completes. |
| 416 | */ |
| 417 | scsi_req_abort_cmd(qc->scsicmd); |
| 418 | } |
| 419 | |
Tejun Heo | 7b70fc0 | 2006-05-15 20:58:07 +0900 | [diff] [blame] | 420 | /** |
| 421 | * ata_port_schedule_eh - schedule error handling without a qc |
| 422 | * @ap: ATA port to schedule EH for |
| 423 | * |
| 424 | * Schedule error handling for @ap. EH will kick in as soon as |
| 425 | * all commands are drained. |
| 426 | * |
| 427 | * LOCKING: |
| 428 | * spin_lock_irqsave(host_set lock) |
| 429 | */ |
| 430 | void ata_port_schedule_eh(struct ata_port *ap) |
| 431 | { |
| 432 | WARN_ON(!ap->ops->error_handler); |
| 433 | |
| 434 | ap->flags |= ATA_FLAG_EH_PENDING; |
| 435 | ata_schedule_scsi_eh(ap->host); |
| 436 | |
| 437 | DPRINTK("port EH scheduled\n"); |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * ata_port_abort - abort all qc's on the port |
| 442 | * @ap: ATA port to abort qc's for |
| 443 | * |
| 444 | * Abort all active qc's of @ap and schedule EH. |
| 445 | * |
| 446 | * LOCKING: |
| 447 | * spin_lock_irqsave(host_set lock) |
| 448 | * |
| 449 | * RETURNS: |
| 450 | * Number of aborted qc's. |
| 451 | */ |
| 452 | int ata_port_abort(struct ata_port *ap) |
| 453 | { |
| 454 | int tag, nr_aborted = 0; |
| 455 | |
| 456 | WARN_ON(!ap->ops->error_handler); |
| 457 | |
| 458 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { |
| 459 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); |
| 460 | |
| 461 | if (qc) { |
| 462 | qc->flags |= ATA_QCFLAG_FAILED; |
| 463 | ata_qc_complete(qc); |
| 464 | nr_aborted++; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | if (!nr_aborted) |
| 469 | ata_port_schedule_eh(ap); |
| 470 | |
| 471 | return nr_aborted; |
| 472 | } |
| 473 | |
Tejun Heo | e318049 | 2006-05-15 20:58:09 +0900 | [diff] [blame] | 474 | /** |
| 475 | * __ata_port_freeze - freeze port |
| 476 | * @ap: ATA port to freeze |
| 477 | * |
| 478 | * This function is called when HSM violation or some other |
| 479 | * condition disrupts normal operation of the port. Frozen port |
| 480 | * is not allowed to perform any operation until the port is |
| 481 | * thawed, which usually follows a successful reset. |
| 482 | * |
| 483 | * ap->ops->freeze() callback can be used for freezing the port |
| 484 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a |
| 485 | * port cannot be frozen hardware-wise, the interrupt handler |
| 486 | * must ack and clear interrupts unconditionally while the port |
| 487 | * is frozen. |
| 488 | * |
| 489 | * LOCKING: |
| 490 | * spin_lock_irqsave(host_set lock) |
| 491 | */ |
| 492 | static void __ata_port_freeze(struct ata_port *ap) |
| 493 | { |
| 494 | WARN_ON(!ap->ops->error_handler); |
| 495 | |
| 496 | if (ap->ops->freeze) |
| 497 | ap->ops->freeze(ap); |
| 498 | |
| 499 | ap->flags |= ATA_FLAG_FROZEN; |
| 500 | |
| 501 | DPRINTK("ata%u port frozen\n", ap->id); |
| 502 | } |
| 503 | |
| 504 | /** |
| 505 | * ata_port_freeze - abort & freeze port |
| 506 | * @ap: ATA port to freeze |
| 507 | * |
| 508 | * Abort and freeze @ap. |
| 509 | * |
| 510 | * LOCKING: |
| 511 | * spin_lock_irqsave(host_set lock) |
| 512 | * |
| 513 | * RETURNS: |
| 514 | * Number of aborted commands. |
| 515 | */ |
| 516 | int ata_port_freeze(struct ata_port *ap) |
| 517 | { |
| 518 | int nr_aborted; |
| 519 | |
| 520 | WARN_ON(!ap->ops->error_handler); |
| 521 | |
| 522 | nr_aborted = ata_port_abort(ap); |
| 523 | __ata_port_freeze(ap); |
| 524 | |
| 525 | return nr_aborted; |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * ata_eh_freeze_port - EH helper to freeze port |
| 530 | * @ap: ATA port to freeze |
| 531 | * |
| 532 | * Freeze @ap. |
| 533 | * |
| 534 | * LOCKING: |
| 535 | * None. |
| 536 | */ |
| 537 | void ata_eh_freeze_port(struct ata_port *ap) |
| 538 | { |
| 539 | unsigned long flags; |
| 540 | |
| 541 | if (!ap->ops->error_handler) |
| 542 | return; |
| 543 | |
| 544 | spin_lock_irqsave(&ap->host_set->lock, flags); |
| 545 | __ata_port_freeze(ap); |
| 546 | spin_unlock_irqrestore(&ap->host_set->lock, flags); |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * ata_port_thaw_port - EH helper to thaw port |
| 551 | * @ap: ATA port to thaw |
| 552 | * |
| 553 | * Thaw frozen port @ap. |
| 554 | * |
| 555 | * LOCKING: |
| 556 | * None. |
| 557 | */ |
| 558 | void ata_eh_thaw_port(struct ata_port *ap) |
| 559 | { |
| 560 | unsigned long flags; |
| 561 | |
| 562 | if (!ap->ops->error_handler) |
| 563 | return; |
| 564 | |
| 565 | spin_lock_irqsave(&ap->host_set->lock, flags); |
| 566 | |
| 567 | ap->flags &= ~ATA_FLAG_FROZEN; |
| 568 | |
| 569 | if (ap->ops->thaw) |
| 570 | ap->ops->thaw(ap); |
| 571 | |
| 572 | spin_unlock_irqrestore(&ap->host_set->lock, flags); |
| 573 | |
| 574 | DPRINTK("ata%u port thawed\n", ap->id); |
| 575 | } |
| 576 | |
Tejun Heo | ece1d63 | 2006-04-02 18:51:53 +0900 | [diff] [blame] | 577 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
| 578 | { |
| 579 | /* nada */ |
| 580 | } |
| 581 | |
| 582 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) |
| 583 | { |
| 584 | struct ata_port *ap = qc->ap; |
| 585 | struct scsi_cmnd *scmd = qc->scsicmd; |
| 586 | unsigned long flags; |
| 587 | |
| 588 | spin_lock_irqsave(&ap->host_set->lock, flags); |
| 589 | qc->scsidone = ata_eh_scsidone; |
| 590 | __ata_qc_complete(qc); |
| 591 | WARN_ON(ata_tag_valid(qc->tag)); |
| 592 | spin_unlock_irqrestore(&ap->host_set->lock, flags); |
| 593 | |
| 594 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); |
| 595 | } |
| 596 | |
| 597 | /** |
| 598 | * ata_eh_qc_complete - Complete an active ATA command from EH |
| 599 | * @qc: Command to complete |
| 600 | * |
| 601 | * Indicate to the mid and upper layers that an ATA command has |
| 602 | * completed. To be used from EH. |
| 603 | */ |
| 604 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) |
| 605 | { |
| 606 | struct scsi_cmnd *scmd = qc->scsicmd; |
| 607 | scmd->retries = scmd->allowed; |
| 608 | __ata_eh_qc_complete(qc); |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH |
| 613 | * @qc: Command to retry |
| 614 | * |
| 615 | * Indicate to the mid and upper layers that an ATA command |
| 616 | * should be retried. To be used from EH. |
| 617 | * |
| 618 | * SCSI midlayer limits the number of retries to scmd->allowed. |
| 619 | * scmd->retries is decremented for commands which get retried |
| 620 | * due to unrelated failures (qc->err_mask is zero). |
| 621 | */ |
| 622 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) |
| 623 | { |
| 624 | struct scsi_cmnd *scmd = qc->scsicmd; |
| 625 | if (!qc->err_mask && scmd->retries) |
| 626 | scmd->retries--; |
| 627 | __ata_eh_qc_complete(qc); |
| 628 | } |