Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale |
| 3 | * |
| 4 | * SCSI error/timeout handling |
| 5 | * Initial versions: Eric Youngdale. Based upon conversations with |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * ideas originating from all over the place. |
| 8 | * |
| 9 | * Restructured scsi_unjam_host and associated functions. |
| 10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) |
| 11 | * |
| 12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 13 | * minor cleanups. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/timer.h> |
| 21 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 23 | #include <linux/freezer.h> |
Christoph Hellwig | c5478de | 2005-09-06 14:04:26 +0200 | [diff] [blame] | 24 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
| 26 | #include <linux/blkdev.h> |
| 27 | #include <linux/delay.h> |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 28 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | #include <scsi/scsi.h> |
Christoph Hellwig | beb4048 | 2006-06-10 18:01:03 +0200 | [diff] [blame] | 31 | #include <scsi/scsi_cmnd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <scsi/scsi_dbg.h> |
| 33 | #include <scsi/scsi_device.h> |
Martin K. Petersen | 18a4d0a | 2012-02-09 13:48:53 -0500 | [diff] [blame] | 34 | #include <scsi/scsi_driver.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <scsi/scsi_eh.h> |
Sagi Grimberg | 7708c16 | 2015-07-08 17:58:52 +0300 | [diff] [blame] | 36 | #include <scsi/scsi_common.h> |
James Smart | c829c39 | 2006-03-13 08:28:57 -0500 | [diff] [blame] | 37 | #include <scsi/scsi_transport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <scsi/scsi_host.h> |
| 39 | #include <scsi/scsi_ioctl.h> |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 40 | #include <scsi/scsi_dh.h> |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 41 | #include <scsi/sg.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #include "scsi_priv.h" |
| 44 | #include "scsi_logging.h" |
Adrian Bunk | 79ee830 | 2007-08-10 14:50:42 -0700 | [diff] [blame] | 45 | #include "scsi_transport_api.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Kei Tokunaga | bf81623 | 2010-04-01 20:41:40 +0900 | [diff] [blame] | 47 | #include <trace/events/scsi.h> |
| 48 | |
James Bottomley | 1421656 | 2012-07-25 23:55:55 +0400 | [diff] [blame] | 49 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* |
| 52 | * These should *probably* be handled by the host itself. |
| 53 | * Since it is allowed to sleep, it probably should. |
| 54 | */ |
| 55 | #define BUS_RESET_SETTLE_TIME (10) |
| 56 | #define HOST_RESET_SETTLE_TIME (10) |
| 57 | |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 58 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 59 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
| 60 | struct scsi_cmnd *); |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | /* called with shost->host_lock held */ |
| 63 | void scsi_eh_wakeup(struct Scsi_Host *shost) |
| 64 | { |
Christoph Hellwig | 7466501 | 2014-01-22 15:29:29 +0100 | [diff] [blame] | 65 | if (atomic_read(&shost->host_busy) == shost->host_failed) { |
Kei Tokunaga | bf81623 | 2010-04-01 20:41:40 +0900 | [diff] [blame] | 66 | trace_scsi_eh_wakeup(shost); |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 67 | wake_up_process(shost->ehandler); |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 68 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
| 69 | "Waking error handler thread\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | } |
Tejun Heo | f8bbfc2 | 2006-05-19 21:07:05 +0900 | [diff] [blame] | 72 | |
| 73 | /** |
| 74 | * scsi_schedule_eh - schedule EH for SCSI host |
| 75 | * @shost: SCSI host to invoke error handling on. |
| 76 | * |
| 77 | * Schedule SCSI EH without scmd. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 78 | */ |
Tejun Heo | f8bbfc2 | 2006-05-19 21:07:05 +0900 | [diff] [blame] | 79 | void scsi_schedule_eh(struct Scsi_Host *shost) |
| 80 | { |
| 81 | unsigned long flags; |
| 82 | |
| 83 | spin_lock_irqsave(shost->host_lock, flags); |
| 84 | |
| 85 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || |
| 86 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { |
| 87 | shost->host_eh_scheduled++; |
| 88 | scsi_eh_wakeup(shost); |
| 89 | } |
| 90 | |
| 91 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 92 | } |
| 93 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 95 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
| 96 | { |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 97 | if (!shost->last_reset || shost->eh_deadline == -1) |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 98 | return 0; |
| 99 | |
Hannes Reinecke | 76ad3e5 | 2013-11-11 13:44:55 +0100 | [diff] [blame] | 100 | /* |
| 101 | * 32bit accesses are guaranteed to be atomic |
| 102 | * (on all supported architectures), so instead |
| 103 | * of using a spinlock we can as well double check |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 104 | * if eh_deadline has been set to 'off' during the |
Hannes Reinecke | 76ad3e5 | 2013-11-11 13:44:55 +0100 | [diff] [blame] | 105 | * time_before call. |
| 106 | */ |
| 107 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 108 | shost->eh_deadline > -1) |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 109 | return 0; |
| 110 | |
| 111 | return 1; |
| 112 | } |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | /** |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 115 | * scmd_eh_abort_handler - Handle command aborts |
| 116 | * @work: command to be aborted. |
| 117 | */ |
| 118 | void |
| 119 | scmd_eh_abort_handler(struct work_struct *work) |
| 120 | { |
| 121 | struct scsi_cmnd *scmd = |
| 122 | container_of(work, struct scsi_cmnd, abort_work.work); |
| 123 | struct scsi_device *sdev = scmd->device; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 124 | int rtn; |
| 125 | |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 126 | if (scsi_host_eh_past_deadline(sdev->host)) { |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 127 | SCSI_LOG_ERROR_RECOVERY(3, |
| 128 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 129 | "eh timeout, not aborting\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 130 | } else { |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 131 | SCSI_LOG_ERROR_RECOVERY(3, |
| 132 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 133 | "aborting command\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 134 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
| 135 | if (rtn == SUCCESS) { |
Ulrich Obergfell | 8922a90 | 2014-06-04 13:34:57 +0200 | [diff] [blame] | 136 | set_host_byte(scmd, DID_TIME_OUT); |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 137 | if (scsi_host_eh_past_deadline(sdev->host)) { |
| 138 | SCSI_LOG_ERROR_RECOVERY(3, |
| 139 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 140 | "eh timeout, not retrying " |
| 141 | "aborted command\n")); |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 142 | } else if (!scsi_noretry_cmd(scmd) && |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 143 | (++scmd->retries <= scmd->allowed)) { |
| 144 | SCSI_LOG_ERROR_RECOVERY(3, |
| 145 | scmd_printk(KERN_WARNING, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 146 | "retry aborted command\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 147 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 148 | return; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 149 | } else { |
| 150 | SCSI_LOG_ERROR_RECOVERY(3, |
| 151 | scmd_printk(KERN_WARNING, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 152 | "finish aborted command\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 153 | scsi_finish_command(scmd); |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 154 | return; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 155 | } |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 156 | } else { |
| 157 | SCSI_LOG_ERROR_RECOVERY(3, |
| 158 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 159 | "cmd abort %s\n", |
Hannes Reinecke | 883a030 | 2014-10-24 14:27:04 +0200 | [diff] [blame] | 160 | (rtn == FAST_IO_FAIL) ? |
| 161 | "not send" : "failed")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 162 | } |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | if (!scsi_eh_scmd_add(scmd, 0)) { |
| 166 | SCSI_LOG_ERROR_RECOVERY(3, |
| 167 | scmd_printk(KERN_WARNING, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 168 | "terminate aborted command\n")); |
Ulrich Obergfell | 8922a90 | 2014-06-04 13:34:57 +0200 | [diff] [blame] | 169 | set_host_byte(scmd, DID_TIME_OUT); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 170 | scsi_finish_command(scmd); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * scsi_abort_command - schedule a command abort |
| 176 | * @scmd: scmd to abort. |
| 177 | * |
| 178 | * We only need to abort commands after a command timeout |
| 179 | */ |
| 180 | static int |
| 181 | scsi_abort_command(struct scsi_cmnd *scmd) |
| 182 | { |
| 183 | struct scsi_device *sdev = scmd->device; |
| 184 | struct Scsi_Host *shost = sdev->host; |
| 185 | unsigned long flags; |
| 186 | |
| 187 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { |
| 188 | /* |
| 189 | * Retry after abort failed, escalate to next level. |
| 190 | */ |
Hannes Reinecke | 7daf480 | 2014-03-31 16:37:34 +0200 | [diff] [blame] | 191 | scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 192 | SCSI_LOG_ERROR_RECOVERY(3, |
| 193 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 194 | "previous abort failed\n")); |
Bart Van Assche | fcc95a7 | 2014-06-02 11:50:52 +0200 | [diff] [blame] | 195 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 196 | return FAILED; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Do not try a command abort if |
| 201 | * SCSI EH has already started. |
| 202 | */ |
| 203 | spin_lock_irqsave(shost->host_lock, flags); |
| 204 | if (scsi_host_in_recovery(shost)) { |
| 205 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 206 | SCSI_LOG_ERROR_RECOVERY(3, |
| 207 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 208 | "not aborting, host in recovery\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 209 | return FAILED; |
| 210 | } |
| 211 | |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 212 | if (shost->eh_deadline != -1 && !shost->last_reset) |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 213 | shost->last_reset = jiffies; |
| 214 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 215 | |
| 216 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; |
| 217 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 218 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 219 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
| 220 | return SUCCESS; |
| 221 | } |
| 222 | |
| 223 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | * scsi_eh_scmd_add - add scsi cmd to error handling. |
| 225 | * @scmd: scmd to run eh on. |
| 226 | * @eh_flag: optional SCSI_EH flag. |
| 227 | * |
| 228 | * Return value: |
| 229 | * 0 on failure. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 230 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
| 232 | { |
| 233 | struct Scsi_Host *shost = scmd->device->host; |
| 234 | unsigned long flags; |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 235 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 237 | if (!shost->ehandler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | return 0; |
| 239 | |
| 240 | spin_lock_irqsave(shost->host_lock, flags); |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 241 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
| 242 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) |
| 243 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 245 | if (shost->eh_deadline != -1 && !shost->last_reset) |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 246 | shost->last_reset = jiffies; |
| 247 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 248 | ret = 1; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 249 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
| 250 | eh_flag &= ~SCSI_EH_CANCEL_CMD; |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 251 | scmd->eh_eflags |= eh_flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | shost->host_failed++; |
| 254 | scsi_eh_wakeup(shost); |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 255 | out_unlock: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | spin_unlock_irqrestore(shost->host_lock, flags); |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 257 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | * scsi_times_out - Timeout function for normal scsi commands. |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 262 | * @req: request that is timing out. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | * |
| 264 | * Notes: |
| 265 | * We do not need to lock this. There is the potential for a race |
| 266 | * only in that the normal completion handling might run, but if the |
| 267 | * normal completion function determines that the timer has already |
| 268 | * fired, then it mustn't do anything. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 269 | */ |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 270 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 272 | struct scsi_cmnd *scmd = req->special; |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 273 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 274 | struct Scsi_Host *host = scmd->device->host; |
James Bottomley | 6c5f8ce | 2007-03-16 17:44:41 -0500 | [diff] [blame] | 275 | |
Kei Tokunaga | bf81623 | 2010-04-01 20:41:40 +0900 | [diff] [blame] | 276 | trace_scsi_dispatch_cmd_timeout(scmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
| 278 | |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 279 | if (host->eh_deadline != -1 && !host->last_reset) |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 280 | host->last_reset = jiffies; |
| 281 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 282 | if (host->transportt->eh_timed_out) |
| 283 | rtn = host->transportt->eh_timed_out(scmd); |
| 284 | else if (host->hostt->eh_timed_out) |
| 285 | rtn = host->hostt->eh_timed_out(scmd); |
James Bottomley | 6c5f8ce | 2007-03-16 17:44:41 -0500 | [diff] [blame] | 286 | |
Hannes Reinecke | a33c070 | 2014-06-13 14:01:45 +0200 | [diff] [blame] | 287 | if (rtn == BLK_EH_NOT_HANDLED) { |
| 288 | if (!host->hostt->no_async_abort && |
| 289 | scsi_abort_command(scmd) == SUCCESS) |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 290 | return BLK_EH_NOT_HANDLED; |
| 291 | |
Hannes Reinecke | a33c070 | 2014-06-13 14:01:45 +0200 | [diff] [blame] | 292 | set_host_byte(scmd, DID_TIME_OUT); |
| 293 | if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) |
| 294 | rtn = BLK_EH_HANDLED; |
| 295 | } |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 296 | |
Christoph Hellwig | fa99078 | 2008-11-05 15:03:15 +0100 | [diff] [blame] | 297 | return rtn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | /** |
| 301 | * scsi_block_when_processing_errors - Prevent cmds from being queued. |
| 302 | * @sdev: Device on which we are performing recovery. |
| 303 | * |
| 304 | * Description: |
| 305 | * We block until the host is out of error recovery, and then check to |
| 306 | * see whether the host or the device is offline. |
| 307 | * |
| 308 | * Return value: |
| 309 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 310 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
| 312 | { |
| 313 | int online; |
| 314 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 315 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | online = scsi_device_online(sdev); |
| 318 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 319 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, |
| 320 | "%s: rtn: %d\n", __func__, online)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | return online; |
| 323 | } |
| 324 | EXPORT_SYMBOL(scsi_block_when_processing_errors); |
| 325 | |
| 326 | #ifdef CONFIG_SCSI_LOGGING |
| 327 | /** |
| 328 | * scsi_eh_prt_fail_stats - Log info on failures. |
| 329 | * @shost: scsi host being recovered. |
| 330 | * @work_q: Queue of scsi cmds to process. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 331 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
| 333 | struct list_head *work_q) |
| 334 | { |
| 335 | struct scsi_cmnd *scmd; |
| 336 | struct scsi_device *sdev; |
| 337 | int total_failures = 0; |
| 338 | int cmd_failed = 0; |
| 339 | int cmd_cancel = 0; |
| 340 | int devices_failed = 0; |
| 341 | |
| 342 | shost_for_each_device(sdev, shost) { |
| 343 | list_for_each_entry(scmd, work_q, eh_entry) { |
| 344 | if (scmd->device == sdev) { |
| 345 | ++total_failures; |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 346 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | ++cmd_cancel; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 348 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | ++cmd_failed; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | if (cmd_cancel || cmd_failed) { |
| 354 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a3a790d | 2014-10-24 14:27:03 +0200 | [diff] [blame] | 355 | shost_printk(KERN_INFO, shost, |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 356 | "%s: cmds failed: %d, cancel: %d\n", |
Harvey Harrison | cadbd4a | 2008-07-03 23:47:27 -0700 | [diff] [blame] | 357 | __func__, cmd_failed, |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 358 | cmd_cancel)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | cmd_cancel = 0; |
| 360 | cmd_failed = 0; |
| 361 | ++devices_failed; |
| 362 | } |
| 363 | } |
| 364 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 365 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
| 366 | "Total of %d commands on %d" |
| 367 | " devices require eh work\n", |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 368 | total_failures, devices_failed)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | #endif |
| 371 | |
Ewan D. Milne | 279afdf | 2013-08-08 15:07:48 -0400 | [diff] [blame] | 372 | /** |
| 373 | * scsi_report_lun_change - Set flag on all *other* devices on the same target |
| 374 | * to indicate that a UNIT ATTENTION is expected. |
| 375 | * @sdev: Device reporting the UNIT ATTENTION |
| 376 | */ |
| 377 | static void scsi_report_lun_change(struct scsi_device *sdev) |
| 378 | { |
| 379 | sdev->sdev_target->expecting_lun_change = 1; |
| 380 | } |
| 381 | |
| 382 | /** |
| 383 | * scsi_report_sense - Examine scsi sense information and log messages for |
| 384 | * certain conditions, also issue uevents for some of them. |
| 385 | * @sdev: Device reporting the sense code |
| 386 | * @sshdr: sshdr to be examined |
| 387 | */ |
| 388 | static void scsi_report_sense(struct scsi_device *sdev, |
| 389 | struct scsi_sense_hdr *sshdr) |
| 390 | { |
| 391 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ |
| 392 | |
| 393 | if (sshdr->sense_key == UNIT_ATTENTION) { |
| 394 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { |
| 395 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; |
| 396 | sdev_printk(KERN_WARNING, sdev, |
| 397 | "Inquiry data has changed"); |
| 398 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { |
| 399 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; |
| 400 | scsi_report_lun_change(sdev); |
| 401 | sdev_printk(KERN_WARNING, sdev, |
| 402 | "Warning! Received an indication that the " |
| 403 | "LUN assignments on this target have " |
| 404 | "changed. The Linux SCSI layer does not " |
| 405 | "automatically remap LUN assignments.\n"); |
| 406 | } else if (sshdr->asc == 0x3f) |
| 407 | sdev_printk(KERN_WARNING, sdev, |
| 408 | "Warning! Received an indication that the " |
| 409 | "operating parameters on this target have " |
| 410 | "changed. The Linux SCSI layer does not " |
| 411 | "automatically adjust these parameters.\n"); |
| 412 | |
| 413 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { |
| 414 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; |
| 415 | sdev_printk(KERN_WARNING, sdev, |
| 416 | "Warning! Received an indication that the " |
| 417 | "LUN reached a thin provisioning soft " |
| 418 | "threshold.\n"); |
| 419 | } |
| 420 | |
| 421 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { |
| 422 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; |
| 423 | sdev_printk(KERN_WARNING, sdev, |
| 424 | "Mode parameters changed"); |
Hannes Reinecke | 14c3e67 | 2015-07-06 13:41:53 +0200 | [diff] [blame] | 425 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
| 426 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; |
| 427 | sdev_printk(KERN_WARNING, sdev, |
| 428 | "Asymmetric access state changed"); |
Ewan D. Milne | 279afdf | 2013-08-08 15:07:48 -0400 | [diff] [blame] | 429 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
| 430 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; |
| 431 | sdev_printk(KERN_WARNING, sdev, |
| 432 | "Capacity data has changed"); |
| 433 | } else if (sshdr->asc == 0x2a) |
| 434 | sdev_printk(KERN_WARNING, sdev, |
| 435 | "Parameters changed"); |
| 436 | } |
| 437 | |
| 438 | if (evt_type != SDEV_EVT_MAXBITS) { |
| 439 | set_bit(evt_type, sdev->pending_events); |
| 440 | schedule_work(&sdev->event_work); |
| 441 | } |
| 442 | } |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | /** |
| 445 | * scsi_check_sense - Examine scsi cmd sense |
| 446 | * @scmd: Cmd to have sense checked. |
| 447 | * |
| 448 | * Return value: |
Hannes Reinecke | 87f14e6 | 2013-07-01 15:16:24 +0200 | [diff] [blame] | 449 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | * |
| 451 | * Notes: |
| 452 | * When a deferred error is detected the current command has |
| 453 | * not been executed and needs retrying. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 454 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
| 456 | { |
Chandra Seetharaman | a6a8d9f | 2008-05-01 14:49:46 -0700 | [diff] [blame] | 457 | struct scsi_device *sdev = scmd->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | struct scsi_sense_hdr sshdr; |
| 459 | |
| 460 | if (! scsi_command_normalize_sense(scmd, &sshdr)) |
| 461 | return FAILED; /* no valid sense data */ |
| 462 | |
Ewan D. Milne | 279afdf | 2013-08-08 15:07:48 -0400 | [diff] [blame] | 463 | scsi_report_sense(sdev, &sshdr); |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (scsi_sense_is_deferred(&sshdr)) |
| 466 | return NEEDS_RETRY; |
| 467 | |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 468 | if (sdev->handler && sdev->handler->check_sense) { |
Chandra Seetharaman | a6a8d9f | 2008-05-01 14:49:46 -0700 | [diff] [blame] | 469 | int rc; |
| 470 | |
Christoph Hellwig | ee14c67 | 2015-08-27 14:16:59 +0200 | [diff] [blame] | 471 | rc = sdev->handler->check_sense(sdev, &sshdr); |
Chandra Seetharaman | a6a8d9f | 2008-05-01 14:49:46 -0700 | [diff] [blame] | 472 | if (rc != SCSI_RETURN_NOT_HANDLED) |
| 473 | return rc; |
| 474 | /* handler does not care. Drop down to default handling */ |
| 475 | } |
| 476 | |
Christoph Hellwig | e925cc4 | 2014-11-06 15:11:22 -0600 | [diff] [blame] | 477 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
| 478 | /* |
| 479 | * nasty: for mid-layer issued TURs, we need to return the |
| 480 | * actual sense data without any recovery attempt. For eh |
| 481 | * issued ones, we need to try to recover and interpret |
| 482 | */ |
| 483 | return SUCCESS; |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | /* |
| 486 | * Previous logic looked for FILEMARK, EOM or ILI which are |
| 487 | * mainly associated with tapes and returned SUCCESS. |
| 488 | */ |
| 489 | if (sshdr.response_code == 0x70) { |
| 490 | /* fixed format */ |
| 491 | if (scmd->sense_buffer[2] & 0xe0) |
| 492 | return SUCCESS; |
| 493 | } else { |
| 494 | /* |
| 495 | * descriptor format: look for "stream commands sense data |
| 496 | * descriptor" (see SSC-3). Assume single sense data |
| 497 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. |
| 498 | */ |
| 499 | if ((sshdr.additional_length > 3) && |
| 500 | (scmd->sense_buffer[8] == 0x4) && |
| 501 | (scmd->sense_buffer[11] & 0xe0)) |
| 502 | return SUCCESS; |
| 503 | } |
| 504 | |
| 505 | switch (sshdr.sense_key) { |
| 506 | case NO_SENSE: |
| 507 | return SUCCESS; |
| 508 | case RECOVERED_ERROR: |
| 509 | return /* soft_error */ SUCCESS; |
| 510 | |
| 511 | case ABORTED_COMMAND: |
Martin K. Petersen | 511e44f | 2008-07-17 04:28:33 -0400 | [diff] [blame] | 512 | if (sshdr.asc == 0x10) /* DIF */ |
| 513 | return SUCCESS; |
| 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | return NEEDS_RETRY; |
| 516 | case NOT_READY: |
| 517 | case UNIT_ATTENTION: |
| 518 | /* |
| 519 | * if we are expecting a cc/ua because of a bus reset that we |
| 520 | * performed, treat this just as a retry. otherwise this is |
| 521 | * information that we should pass up to the upper-level driver |
| 522 | * so that we can deal with it there. |
| 523 | */ |
| 524 | if (scmd->device->expecting_cc_ua) { |
TARUISI Hiroaki | dfcf777 | 2011-08-11 20:25:20 +0900 | [diff] [blame] | 525 | /* |
| 526 | * Because some device does not queue unit |
| 527 | * attentions correctly, we carefully check |
| 528 | * additional sense code and qualifier so as |
| 529 | * not to squash media change unit attention. |
| 530 | */ |
| 531 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { |
| 532 | scmd->device->expecting_cc_ua = 0; |
| 533 | return NEEDS_RETRY; |
| 534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | /* |
Ewan D. Milne | 279afdf | 2013-08-08 15:07:48 -0400 | [diff] [blame] | 537 | * we might also expect a cc/ua if another LUN on the target |
| 538 | * reported a UA with an ASC/ASCQ of 3F 0E - |
| 539 | * REPORTED LUNS DATA HAS CHANGED. |
| 540 | */ |
| 541 | if (scmd->device->sdev_target->expecting_lun_change && |
| 542 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
| 543 | return NEEDS_RETRY; |
| 544 | /* |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 545 | * if the device is in the process of becoming ready, we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | * should retry. |
| 547 | */ |
| 548 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) |
| 549 | return NEEDS_RETRY; |
| 550 | /* |
| 551 | * if the device is not started, we need to wake |
| 552 | * the error handler to start the motor |
| 553 | */ |
| 554 | if (scmd->device->allow_restart && |
| 555 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) |
| 556 | return FAILED; |
Christoph Hellwig | 02e031c | 2010-11-10 14:54:09 +0100 | [diff] [blame] | 557 | /* |
| 558 | * Pass the UA upwards for a determination in the completion |
| 559 | * functions. |
| 560 | */ |
| 561 | return SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Hannes Reinecke | 63583cc | 2011-01-18 10:13:11 +0100 | [diff] [blame] | 563 | /* these are not supported */ |
Hannes Reinecke | a9d6ceb8 | 2013-07-01 15:16:25 +0200 | [diff] [blame] | 564 | case DATA_PROTECT: |
| 565 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { |
| 566 | /* Thin provisioning hard threshold reached */ |
| 567 | set_host_byte(scmd, DID_ALLOC_FAILURE); |
| 568 | return SUCCESS; |
| 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | case COPY_ABORTED: |
| 571 | case VOLUME_OVERFLOW: |
| 572 | case MISCOMPARE: |
Hannes Reinecke | 63583cc | 2011-01-18 10:13:11 +0100 | [diff] [blame] | 573 | case BLANK_CHECK: |
Hannes Reinecke | 87f14e6 | 2013-07-01 15:16:24 +0200 | [diff] [blame] | 574 | set_host_byte(scmd, DID_TARGET_FAILURE); |
| 575 | return SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | case MEDIUM_ERROR: |
Luben Tuikov | fd1b494 | 2006-11-29 19:45:23 -0800 | [diff] [blame] | 578 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
| 579 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ |
| 580 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ |
Hannes Reinecke | 7e782af | 2013-07-01 15:16:26 +0200 | [diff] [blame] | 581 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
Hannes Reinecke | 87f14e6 | 2013-07-01 15:16:24 +0200 | [diff] [blame] | 582 | return SUCCESS; |
Luben Tuikov | fd1b494 | 2006-11-29 19:45:23 -0800 | [diff] [blame] | 583 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | return NEEDS_RETRY; |
| 585 | |
| 586 | case HARDWARE_ERROR: |
| 587 | if (scmd->device->retry_hwerror) |
Mike Anderson | bb0003c | 2008-08-12 12:11:58 -0700 | [diff] [blame] | 588 | return ADD_TO_MLQUEUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | else |
Hannes Reinecke | 87f14e6 | 2013-07-01 15:16:24 +0200 | [diff] [blame] | 590 | set_host_byte(scmd, DID_TARGET_FAILURE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
| 592 | case ILLEGAL_REQUEST: |
Mike Snitzer | 47ac56d | 2012-02-13 18:35:11 -0500 | [diff] [blame] | 593 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
| 594 | sshdr.asc == 0x21 || /* Logical block address out of range */ |
| 595 | sshdr.asc == 0x24 || /* Invalid field in cdb */ |
| 596 | sshdr.asc == 0x26) { /* Parameter value invalid */ |
Hannes Reinecke | 87f14e6 | 2013-07-01 15:16:24 +0200 | [diff] [blame] | 597 | set_host_byte(scmd, DID_TARGET_FAILURE); |
Mike Snitzer | 47ac56d | 2012-02-13 18:35:11 -0500 | [diff] [blame] | 598 | } |
| 599 | return SUCCESS; |
| 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | default: |
| 602 | return SUCCESS; |
| 603 | } |
| 604 | } |
| 605 | |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 606 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
| 607 | { |
| 608 | struct scsi_host_template *sht = sdev->host->hostt; |
| 609 | struct scsi_device *tmp_sdev; |
| 610 | |
Christoph Hellwig | c40ecc1 | 2014-11-13 14:25:11 +0100 | [diff] [blame] | 611 | if (!sht->track_queue_depth || |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 612 | sdev->queue_depth >= sdev->max_queue_depth) |
| 613 | return; |
| 614 | |
| 615 | if (time_before(jiffies, |
| 616 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) |
| 617 | return; |
| 618 | |
| 619 | if (time_before(jiffies, |
| 620 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) |
| 621 | return; |
| 622 | |
| 623 | /* |
| 624 | * Walk all devices of a target and do |
| 625 | * ramp up on them. |
| 626 | */ |
| 627 | shost_for_each_device(tmp_sdev, sdev->host) { |
| 628 | if (tmp_sdev->channel != sdev->channel || |
| 629 | tmp_sdev->id != sdev->id || |
| 630 | tmp_sdev->queue_depth == sdev->max_queue_depth) |
| 631 | continue; |
Christoph Hellwig | c40ecc1 | 2014-11-13 14:25:11 +0100 | [diff] [blame] | 632 | |
Christoph Hellwig | db5ed4d | 2014-11-13 15:08:42 +0100 | [diff] [blame] | 633 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 634 | sdev->last_queue_ramp_up = jiffies; |
| 635 | } |
| 636 | } |
| 637 | |
Mike Christie | 42a6a91 | 2009-10-15 17:46:44 -0700 | [diff] [blame] | 638 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
| 639 | { |
| 640 | struct scsi_host_template *sht = sdev->host->hostt; |
| 641 | struct scsi_device *tmp_sdev; |
| 642 | |
Christoph Hellwig | c40ecc1 | 2014-11-13 14:25:11 +0100 | [diff] [blame] | 643 | if (!sht->track_queue_depth) |
Mike Christie | 42a6a91 | 2009-10-15 17:46:44 -0700 | [diff] [blame] | 644 | return; |
| 645 | |
| 646 | shost_for_each_device(tmp_sdev, sdev->host) { |
| 647 | if (tmp_sdev->channel != sdev->channel || |
| 648 | tmp_sdev->id != sdev->id) |
| 649 | continue; |
| 650 | /* |
| 651 | * We do not know the number of commands that were at |
| 652 | * the device when we got the queue full so we start |
| 653 | * from the highest possible value and work our way down. |
| 654 | */ |
Christoph Hellwig | c40ecc1 | 2014-11-13 14:25:11 +0100 | [diff] [blame] | 655 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
Mike Christie | 42a6a91 | 2009-10-15 17:46:44 -0700 | [diff] [blame] | 656 | } |
| 657 | } |
| 658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | /** |
| 660 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. |
| 661 | * @scmd: SCSI cmd to examine. |
| 662 | * |
| 663 | * Notes: |
| 664 | * This is *only* called when we are examining the status of commands |
| 665 | * queued during error recovery. the main difference here is that we |
| 666 | * don't allow for the possibility of retries here, and we are a lot |
| 667 | * more restrictive about what we consider acceptable. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 668 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
| 670 | { |
| 671 | /* |
| 672 | * first check the host byte, to see if there is anything in there |
| 673 | * that would indicate what we need to do. |
| 674 | */ |
| 675 | if (host_byte(scmd->result) == DID_RESET) { |
| 676 | /* |
| 677 | * rats. we are already in the error handler, so we now |
| 678 | * get to try and figure out what to do next. if the sense |
| 679 | * is valid, we have a pretty good idea of what to do. |
| 680 | * if not, we mark it as FAILED. |
| 681 | */ |
| 682 | return scsi_check_sense(scmd); |
| 683 | } |
| 684 | if (host_byte(scmd->result) != DID_OK) |
| 685 | return FAILED; |
| 686 | |
| 687 | /* |
| 688 | * next, check the message byte. |
| 689 | */ |
| 690 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) |
| 691 | return FAILED; |
| 692 | |
| 693 | /* |
| 694 | * now, check the status byte to see if this indicates |
| 695 | * anything special. |
| 696 | */ |
| 697 | switch (status_byte(scmd->result)) { |
| 698 | case GOOD: |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 699 | scsi_handle_queue_ramp_up(scmd->device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | case COMMAND_TERMINATED: |
| 701 | return SUCCESS; |
| 702 | case CHECK_CONDITION: |
| 703 | return scsi_check_sense(scmd); |
| 704 | case CONDITION_GOOD: |
| 705 | case INTERMEDIATE_GOOD: |
| 706 | case INTERMEDIATE_C_GOOD: |
| 707 | /* |
| 708 | * who knows? FIXME(eric) |
| 709 | */ |
| 710 | return SUCCESS; |
Michael Reed | 5f91bb0 | 2009-08-10 11:59:28 -0500 | [diff] [blame] | 711 | case RESERVATION_CONFLICT: |
James Bottomley | 67110df | 2010-08-06 15:17:24 -0500 | [diff] [blame] | 712 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
| 713 | /* it is a success, we probed the device and |
| 714 | * found it */ |
| 715 | return SUCCESS; |
| 716 | /* otherwise, we failed to send the command */ |
| 717 | return FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | case QUEUE_FULL: |
Mike Christie | 42a6a91 | 2009-10-15 17:46:44 -0700 | [diff] [blame] | 719 | scsi_handle_queue_full(scmd->device); |
| 720 | /* fall through */ |
| 721 | case BUSY: |
Hannes Reinecke | 3eb3a92 | 2010-07-29 10:10:16 +0200 | [diff] [blame] | 722 | return NEEDS_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | default: |
| 724 | return FAILED; |
| 725 | } |
| 726 | return FAILED; |
| 727 | } |
| 728 | |
| 729 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | * scsi_eh_done - Completion function for error handling. |
| 731 | * @scmd: Cmd that is done. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 732 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
| 734 | { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 735 | struct completion *eh_action; |
Michael Reed | 8563167 | 2005-12-07 21:46:27 -0600 | [diff] [blame] | 736 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 737 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 738 | "%s result: %x\n", __func__, scmd->result)); |
Michael Reed | 8563167 | 2005-12-07 21:46:27 -0600 | [diff] [blame] | 739 | |
| 740 | eh_action = scmd->device->host->eh_action; |
| 741 | if (eh_action) |
| 742 | complete(eh_action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | /** |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 746 | * scsi_try_host_reset - ask host adapter to reset itself |
Geert Uytterhoeven | c2b3ebd | 2013-05-17 13:22:29 +0200 | [diff] [blame] | 747 | * @scmd: SCSI cmd to send host reset. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 748 | */ |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 749 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
| 750 | { |
| 751 | unsigned long flags; |
| 752 | int rtn; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 753 | struct Scsi_Host *host = scmd->device->host; |
| 754 | struct scsi_host_template *hostt = host->hostt; |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 755 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 756 | SCSI_LOG_ERROR_RECOVERY(3, |
| 757 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 758 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 759 | if (!hostt->eh_host_reset_handler) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 760 | return FAILED; |
| 761 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 762 | rtn = hostt->eh_host_reset_handler(scmd); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 763 | |
| 764 | if (rtn == SUCCESS) { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 765 | if (!hostt->skip_settle_delay) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 766 | ssleep(HOST_RESET_SETTLE_TIME); |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 767 | spin_lock_irqsave(host->host_lock, flags); |
| 768 | scsi_report_bus_reset(host, scmd_channel(scmd)); |
| 769 | spin_unlock_irqrestore(host->host_lock, flags); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | return rtn; |
| 773 | } |
| 774 | |
| 775 | /** |
| 776 | * scsi_try_bus_reset - ask host to perform a bus reset |
| 777 | * @scmd: SCSI cmd to send bus reset. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 778 | */ |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 779 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
| 780 | { |
| 781 | unsigned long flags; |
| 782 | int rtn; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 783 | struct Scsi_Host *host = scmd->device->host; |
| 784 | struct scsi_host_template *hostt = host->hostt; |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 785 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 786 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
| 787 | "%s: Snd Bus RST\n", __func__)); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 788 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 789 | if (!hostt->eh_bus_reset_handler) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 790 | return FAILED; |
| 791 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 792 | rtn = hostt->eh_bus_reset_handler(scmd); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 793 | |
| 794 | if (rtn == SUCCESS) { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 795 | if (!hostt->skip_settle_delay) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 796 | ssleep(BUS_RESET_SETTLE_TIME); |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 797 | spin_lock_irqsave(host->host_lock, flags); |
| 798 | scsi_report_bus_reset(host, scmd_channel(scmd)); |
| 799 | spin_unlock_irqrestore(host->host_lock, flags); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | return rtn; |
| 803 | } |
| 804 | |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 805 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
| 806 | { |
| 807 | sdev->was_reset = 1; |
| 808 | sdev->expecting_cc_ua = 1; |
| 809 | } |
| 810 | |
| 811 | /** |
| 812 | * scsi_try_target_reset - Ask host to perform a target reset |
| 813 | * @scmd: SCSI cmd used to send a target reset |
| 814 | * |
| 815 | * Notes: |
| 816 | * There is no timeout for this operation. if this operation is |
| 817 | * unreliable for a given host, then the host itself needs to put a |
| 818 | * timer on it, and set the host back to a consistent state prior to |
| 819 | * returning. |
| 820 | */ |
| 821 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) |
| 822 | { |
| 823 | unsigned long flags; |
| 824 | int rtn; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 825 | struct Scsi_Host *host = scmd->device->host; |
| 826 | struct scsi_host_template *hostt = host->hostt; |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 827 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 828 | if (!hostt->eh_target_reset_handler) |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 829 | return FAILED; |
| 830 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 831 | rtn = hostt->eh_target_reset_handler(scmd); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 832 | if (rtn == SUCCESS) { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 833 | spin_lock_irqsave(host->host_lock, flags); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 834 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
| 835 | __scsi_report_device_reset); |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 836 | spin_unlock_irqrestore(host->host_lock, flags); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | return rtn; |
| 840 | } |
| 841 | |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 842 | /** |
| 843 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev |
| 844 | * @scmd: SCSI cmd used to send BDR |
| 845 | * |
| 846 | * Notes: |
| 847 | * There is no timeout for this operation. if this operation is |
| 848 | * unreliable for a given host, then the host itself needs to put a |
| 849 | * timer on it, and set the host back to a consistent state prior to |
| 850 | * returning. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 851 | */ |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 852 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
| 853 | { |
| 854 | int rtn; |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 855 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 856 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 857 | if (!hostt->eh_device_reset_handler) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 858 | return FAILED; |
| 859 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 860 | rtn = hostt->eh_device_reset_handler(scmd); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 861 | if (rtn == SUCCESS) |
| 862 | __scsi_report_device_reset(scmd->device, NULL); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 863 | return rtn; |
| 864 | } |
| 865 | |
Hannes Reinecke | 883a030 | 2014-10-24 14:27:04 +0200 | [diff] [blame] | 866 | /** |
| 867 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command |
Randy Dunlap | 6583f6f | 2014-12-29 09:40:56 -0800 | [diff] [blame] | 868 | * @hostt: SCSI driver host template |
Hannes Reinecke | 883a030 | 2014-10-24 14:27:04 +0200 | [diff] [blame] | 869 | * @scmd: SCSI cmd used to send a target reset |
| 870 | * |
| 871 | * Return value: |
| 872 | * SUCCESS, FAILED, or FAST_IO_FAIL |
| 873 | * |
| 874 | * Notes: |
| 875 | * SUCCESS does not necessarily indicate that the command |
| 876 | * has been aborted; it only indicates that the LLDDs |
| 877 | * has cleared all references to that command. |
| 878 | * LLDDs should return FAILED only if an abort was required |
| 879 | * but could not be executed. LLDDs should return FAST_IO_FAIL |
| 880 | * if the device is temporarily unavailable (eg due to a |
| 881 | * link down on FibreChannel) |
| 882 | */ |
| 883 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, |
| 884 | struct scsi_cmnd *scmd) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 885 | { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 886 | if (!hostt->eh_abort_handler) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 887 | return FAILED; |
| 888 | |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 889 | return hostt->eh_abort_handler(scmd); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 890 | } |
| 891 | |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 892 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
| 893 | { |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 894 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 895 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 896 | if (scsi_try_target_reset(scmd) != SUCCESS) |
| 897 | if (scsi_try_bus_reset(scmd) != SUCCESS) |
| 898 | scsi_try_host_reset(scmd); |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | /** |
Santosh Y | 3b729f7 | 2012-04-08 18:47:09 +0530 | [diff] [blame] | 902 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
Christoph Hellwig | 2dc611d | 2006-11-04 20:04:21 +0100 | [diff] [blame] | 903 | * @scmd: SCSI command structure to hijack |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 904 | * @ses: structure to save restore information |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 905 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 906 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 907 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
Christoph Hellwig | 2dc611d | 2006-11-04 20:04:21 +0100 | [diff] [blame] | 908 | * |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 909 | * This function is used to save a scsi command information before re-execution |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 910 | * as part of the error recovery process. If @sense_bytes is 0 the command |
| 911 | * sent must be one that does not transfer any data. If @sense_bytes != 0 |
| 912 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command |
| 913 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 914 | */ |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 915 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
| 916 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
| f59114b | 2005-04-17 15:00:23 -0500 | [diff] [blame] | 918 | struct scsi_device *sdev = scmd->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 920 | /* |
| 921 | * We need saved copies of a number of fields - this is because |
| 922 | * error handling may need to overwrite these with different values |
| 923 | * to run different commands, and once error handling is complete, |
| 924 | * we will need to restore these values prior to running the actual |
| 925 | * command. |
| 926 | */ |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 927 | ses->cmd_len = scmd->cmd_len; |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 928 | ses->cmnd = scmd->cmnd; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 929 | ses->data_direction = scmd->sc_data_direction; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 930 | ses->sdb = scmd->sdb; |
Boaz Harrosh | 6f9a35e | 2007-12-13 13:50:53 +0200 | [diff] [blame] | 931 | ses->next_rq = scmd->request->next_rq; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 932 | ses->result = scmd->result; |
Alan Stern | 1226570 | 2008-07-21 10:25:52 -0400 | [diff] [blame] | 933 | ses->underflow = scmd->underflow; |
Martin K. Petersen | db007fc | 2008-07-17 04:28:31 -0400 | [diff] [blame] | 934 | ses->prot_op = scmd->prot_op; |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 935 | |
Martin K. Petersen | db007fc | 2008-07-17 04:28:31 -0400 | [diff] [blame] | 936 | scmd->prot_op = SCSI_PROT_NORMAL; |
James Bottomley | c69e6f8 | 2014-04-10 13:36:11 -0700 | [diff] [blame] | 937 | scmd->eh_eflags = 0; |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 938 | scmd->cmnd = ses->eh_cmnd; |
| 939 | memset(scmd->cmnd, 0, BLK_MAX_CDB); |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 940 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
Boaz Harrosh | 6f9a35e | 2007-12-13 13:50:53 +0200 | [diff] [blame] | 941 | scmd->request->next_rq = NULL; |
Alan Stern | 644373a | 2014-03-28 10:51:15 -0700 | [diff] [blame] | 942 | scmd->result = 0; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 943 | |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 944 | if (sense_bytes) { |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 945 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
| 946 | sense_bytes); |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 947 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 948 | scmd->sdb.length); |
| 949 | scmd->sdb.table.sgl = &ses->sense_sgl; |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 950 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
Tony Battersby | 0c958ec | 2015-07-16 11:40:41 -0400 | [diff] [blame] | 951 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 952 | scmd->cmnd[0] = REQUEST_SENSE; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 953 | scmd->cmnd[4] = scmd->sdb.length; |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 954 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 955 | } else { |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 956 | scmd->sc_data_direction = DMA_NONE; |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 957 | if (cmnd) { |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 958 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 959 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
| 960 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
| 961 | } |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | scmd->underflow = 0; |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 965 | |
Boaz Harrosh | 55db6c1 | 2007-10-08 16:35:19 +0200 | [diff] [blame] | 966 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
| f59114b | 2005-04-17 15:00:23 -0500 | [diff] [blame] | 968 | (sdev->lun << 5 & 0xe0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 970 | /* |
| 971 | * Zero the sense buffer. The scsi spec mandates that any |
| 972 | * untransferred sense data should be interpreted as being zero. |
| 973 | */ |
FUJITA Tomonori | b80ca4f | 2008-01-13 15:46:13 +0900 | [diff] [blame] | 974 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 975 | } |
| 976 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 977 | |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 978 | /** |
Santosh Y | 3b729f7 | 2012-04-08 18:47:09 +0530 | [diff] [blame] | 979 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 980 | * @scmd: SCSI command structure to restore |
Bartlomiej Zolnierkiewicz | 477e608 | 2009-04-27 20:54:22 +0200 | [diff] [blame] | 981 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 982 | * |
Bartlomiej Zolnierkiewicz | 477e608 | 2009-04-27 20:54:22 +0200 | [diff] [blame] | 983 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 984 | */ |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 985 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
| 986 | { |
| 987 | /* |
| 988 | * Restore original data |
| 989 | */ |
| 990 | scmd->cmd_len = ses->cmd_len; |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 991 | scmd->cmnd = ses->cmnd; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 992 | scmd->sc_data_direction = ses->data_direction; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 993 | scmd->sdb = ses->sdb; |
Boaz Harrosh | 6f9a35e | 2007-12-13 13:50:53 +0200 | [diff] [blame] | 994 | scmd->request->next_rq = ses->next_rq; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 995 | scmd->result = ses->result; |
Alan Stern | 1226570 | 2008-07-21 10:25:52 -0400 | [diff] [blame] | 996 | scmd->underflow = ses->underflow; |
Martin K. Petersen | db007fc | 2008-07-17 04:28:31 -0400 | [diff] [blame] | 997 | scmd->prot_op = ses->prot_op; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 998 | } |
| 999 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); |
| 1000 | |
| 1001 | /** |
Santosh Y | 3b729f7 | 2012-04-08 18:47:09 +0530 | [diff] [blame] | 1002 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1003 | * @scmd: SCSI command structure to hijack |
| 1004 | * @cmnd: CDB to send |
| 1005 | * @cmnd_size: size in bytes of @cmnd |
| 1006 | * @timeout: timeout for this request |
| 1007 | * @sense_bytes: size of sense data to copy or 0 |
| 1008 | * |
| 1009 | * This function is used to send a scsi command down to a target device |
| 1010 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. |
| 1011 | * |
| 1012 | * Return value: |
| 1013 | * SUCCESS or FAILED or NEEDS_RETRY |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1014 | */ |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1015 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
| 1016 | int cmnd_size, int timeout, unsigned sense_bytes) |
| 1017 | { |
| 1018 | struct scsi_device *sdev = scmd->device; |
| 1019 | struct Scsi_Host *shost = sdev->host; |
| 1020 | DECLARE_COMPLETION_ONSTACK(done); |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1021 | unsigned long timeleft = timeout; |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1022 | struct scsi_eh_save ses; |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1023 | const unsigned long stall_for = msecs_to_jiffies(100); |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1024 | int rtn; |
| 1025 | |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1026 | retry: |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1027 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 1028 | shost->eh_action = &done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | scsi_log_send(scmd); |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 1031 | scmd->scsi_done = scsi_eh_done; |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1032 | rtn = shost->hostt->queuecommand(shost, scmd); |
| 1033 | if (rtn) { |
| 1034 | if (timeleft > stall_for) { |
| 1035 | scsi_eh_restore_cmnd(scmd, &ses); |
| 1036 | timeleft -= stall_for; |
| 1037 | msleep(jiffies_to_msecs(stall_for)); |
| 1038 | goto retry; |
| 1039 | } |
| 1040 | /* signal not to enter either branch of the if () below */ |
| 1041 | timeleft = 0; |
Alan Stern | 511833a | 2014-11-21 10:44:49 -0500 | [diff] [blame] | 1042 | rtn = FAILED; |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1043 | } else { |
| 1044 | timeleft = wait_for_completion_timeout(&done, timeout); |
Hannes Reinecke | ac61d19 | 2014-05-08 08:09:56 +0200 | [diff] [blame] | 1045 | rtn = SUCCESS; |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
| f59114b | 2005-04-17 15:00:23 -0500 | [diff] [blame] | 1048 | shost->eh_action = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1050 | scsi_log_completion(scmd, rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1052 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 1053 | "%s timeleft: %ld\n", |
| 1054 | __func__, timeleft)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
| 1056 | /* |
Hannes Reinecke | fc73648 | 2013-04-25 08:10:00 +0200 | [diff] [blame] | 1057 | * If there is time left scsi_eh_done got called, and we will examine |
| 1058 | * the actual status codes to see whether the command actually did |
| 1059 | * complete normally, else if we have a zero return and no time left, |
| 1060 | * the command must still be pending, so abort it and return FAILED. |
| 1061 | * If we never actually managed to issue the command, because |
| 1062 | * ->queuecommand() kept returning non zero, use the rtn = FAILED |
| 1063 | * value above (so don't execute either branch of the if) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | */ |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 1065 | if (timeleft) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | rtn = scsi_eh_completed_normally(scmd); |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1067 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
| 1068 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 1069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | switch (rtn) { |
| 1071 | case SUCCESS: |
| 1072 | case NEEDS_RETRY: |
| 1073 | case FAILED: |
| 1074 | break; |
Hannes Reinecke | 6e883b0 | 2009-09-17 17:00:26 +0200 | [diff] [blame] | 1075 | case ADD_TO_MLQUEUE: |
| 1076 | rtn = NEEDS_RETRY; |
| 1077 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | default: |
| 1079 | rtn = FAILED; |
| 1080 | break; |
| 1081 | } |
Alan Stern | 511833a | 2014-11-21 10:44:49 -0500 | [diff] [blame] | 1082 | } else if (rtn != FAILED) { |
Brian King | 292148f | 2007-01-30 17:51:17 -0600 | [diff] [blame] | 1083 | scsi_abort_eh_cmnd(scmd); |
Christoph Hellwig | 7dfdc9a | 2005-10-31 18:49:52 +0100 | [diff] [blame] | 1084 | rtn = FAILED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | } |
| 1086 | |
Boaz Harrosh | e1c2346 | 2007-10-08 16:36:45 +0200 | [diff] [blame] | 1087 | scsi_eh_restore_cmnd(scmd, &ses); |
Martin K. Petersen | 18a4d0a | 2012-02-09 13:48:53 -0500 | [diff] [blame] | 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | return rtn; |
| 1090 | } |
| 1091 | |
| 1092 | /** |
| 1093 | * scsi_request_sense - Request sense data from a particular target. |
| 1094 | * @scmd: SCSI cmd for request sense. |
| 1095 | * |
| 1096 | * Notes: |
| 1097 | * Some hosts automatically obtain this information, others require |
| 1098 | * that we obtain it on our own. This function will *not* return until |
| 1099 | * the command either times out, or it completes. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1100 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
| 1102 | { |
Martin K. Petersen | 0816c92 | 2013-05-10 10:36:04 -0400 | [diff] [blame] | 1103 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | } |
| 1105 | |
James Bottomley | 2451079 | 2013-11-11 13:44:53 +0100 | [diff] [blame] | 1106 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
| 1107 | { |
| 1108 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
| 1109 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
| 1110 | if (sdrv->eh_action) |
| 1111 | rtn = sdrv->eh_action(scmd, rtn); |
| 1112 | } |
| 1113 | return rtn; |
| 1114 | } |
| 1115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | /** |
| 1117 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. |
| 1118 | * @scmd: Original SCSI cmd that eh has finished. |
| 1119 | * @done_q: Queue for processed commands. |
| 1120 | * |
| 1121 | * Notes: |
| 1122 | * We don't want to use the normal command completion while we are are |
| 1123 | * still handling errors - it may cause other commands to be queued, |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1124 | * and that would disturb what we are doing. Thus we really want to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | * keep a list of pending commands for final completion, and once we |
| 1126 | * are ready to leave error handling we handle completion for real. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1127 | */ |
Tejun Heo | 041c5fc | 2006-01-23 13:09:36 +0900 | [diff] [blame] | 1128 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | { |
| 1130 | scmd->device->host->host_failed--; |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 1131 | scmd->eh_eflags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | list_move_tail(&scmd->eh_entry, done_q); |
| 1133 | } |
Tejun Heo | 041c5fc | 2006-01-23 13:09:36 +0900 | [diff] [blame] | 1134 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
| 1136 | /** |
| 1137 | * scsi_eh_get_sense - Get device sense data. |
| 1138 | * @work_q: Queue of commands to process. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1139 | * @done_q: Queue of processed commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | * |
| 1141 | * Description: |
| 1142 | * See if we need to request sense information. if so, then get it |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1143 | * now, so we have a better idea of what to do. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | * |
| 1145 | * Notes: |
| 1146 | * This has the unfortunate side effect that if a shost adapter does |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1147 | * not automatically request sense information, we end up shutting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | * it down before we request it. |
| 1149 | * |
| 1150 | * All drivers should request sense information internally these days, |
| 1151 | * so for now all I have to say is tough noogies if you end up in here. |
| 1152 | * |
| 1153 | * XXX: Long term this code should go away, but that needs an audit of |
| 1154 | * all LLDDs first. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1155 | */ |
Darrick J. Wong | dca84e4 | 2007-01-26 14:08:49 -0800 | [diff] [blame] | 1156 | int scsi_eh_get_sense(struct list_head *work_q, |
| 1157 | struct list_head *done_q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1159 | struct scsi_cmnd *scmd, *next; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1160 | struct Scsi_Host *shost; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | int rtn; |
| 1162 | |
jiang.biao2@zte.com.cn | 709c75b | 2015-07-31 17:52:10 +0800 | [diff] [blame] | 1163 | /* |
| 1164 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, |
| 1165 | * should not get sense. |
| 1166 | */ |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1167 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 1168 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
jiang.biao2@zte.com.cn | 709c75b | 2015-07-31 17:52:10 +0800 | [diff] [blame] | 1169 | (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | SCSI_SENSE_VALID(scmd)) |
| 1171 | continue; |
| 1172 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1173 | shost = scmd->device->host; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1174 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1175 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1176 | scmd_printk(KERN_INFO, scmd, |
| 1177 | "%s: skip request sense, past eh deadline\n", |
| 1178 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1179 | break; |
| 1180 | } |
James Bottomley | d555a2a | 2014-03-28 10:50:17 -0700 | [diff] [blame] | 1181 | if (status_byte(scmd->result) != CHECK_CONDITION) |
| 1182 | /* |
| 1183 | * don't request sense if there's no check condition |
| 1184 | * status because the error we're processing isn't one |
| 1185 | * that has a sense code (and some devices get |
| 1186 | * confused by sense requests out of the blue) |
| 1187 | */ |
| 1188 | continue; |
| 1189 | |
Jeff Garzik | 3bf743e | 2005-10-24 18:04:06 -0400 | [diff] [blame] | 1190 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
| 1191 | "%s: requesting sense\n", |
| 1192 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | rtn = scsi_request_sense(scmd); |
| 1194 | if (rtn != SUCCESS) |
| 1195 | continue; |
| 1196 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1197 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 1198 | "sense requested, result %x\n", scmd->result)); |
Hannes Reinecke | d811b84 | 2014-10-24 14:26:45 +0200 | [diff] [blame] | 1199 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | |
| 1201 | rtn = scsi_decide_disposition(scmd); |
| 1202 | |
| 1203 | /* |
| 1204 | * if the result was normal, then just pass it along to the |
| 1205 | * upper level. |
| 1206 | */ |
| 1207 | if (rtn == SUCCESS) |
| 1208 | /* we don't want this command reissued, just |
| 1209 | * finished with the sense data, so set |
| 1210 | * retries to the max allowed to ensure it |
| 1211 | * won't get reissued */ |
| 1212 | scmd->retries = scmd->allowed; |
| 1213 | else if (rtn != NEEDS_RETRY) |
| 1214 | continue; |
| 1215 | |
| 1216 | scsi_eh_finish_cmd(scmd, done_q); |
| 1217 | } |
| 1218 | |
| 1219 | return list_empty(work_q); |
| 1220 | } |
Darrick J. Wong | dca84e4 | 2007-01-26 14:08:49 -0800 | [diff] [blame] | 1221 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | |
| 1223 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | * scsi_eh_tur - Send TUR to device. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1225 | * @scmd: &scsi_cmnd to send TUR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | * |
| 1227 | * Return value: |
| 1228 | * 0 - Device is ready. 1 - Device NOT ready. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1229 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
| 1231 | { |
| 1232 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; |
| 1233 | int retry_cnt = 1, rtn; |
| 1234 | |
| 1235 | retry_tur: |
Martin K. Petersen | 0816c92 | 2013-05-10 10:36:04 -0400 | [diff] [blame] | 1236 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
| 1237 | scmd->device->eh_timeout, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1239 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 1240 | "%s return: %x\n", __func__, rtn)); |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 1241 | |
| 1242 | switch (rtn) { |
| 1243 | case NEEDS_RETRY: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | if (retry_cnt--) |
| 1245 | goto retry_tur; |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 1246 | /*FALLTHRU*/ |
| 1247 | case SUCCESS: |
Alan Stern | e47373e | 2005-03-30 15:05:45 -0500 | [diff] [blame] | 1248 | return 0; |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 1249 | default: |
| 1250 | return 1; |
Alan Stern | e47373e | 2005-03-30 15:05:45 -0500 | [diff] [blame] | 1251 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | /** |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1255 | * scsi_eh_test_devices - check if devices are responding from error recovery. |
| 1256 | * @cmd_list: scsi commands in error recovery. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1257 | * @work_q: queue for commands which still need more error recovery |
| 1258 | * @done_q: queue for commands which are finished |
| 1259 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1260 | * |
| 1261 | * Decription: |
| 1262 | * Tests if devices are in a working state. Commands to devices now in |
| 1263 | * a working state are sent to the done_q while commands to devices which |
| 1264 | * are still failing to respond are returned to the work_q for more |
| 1265 | * processing. |
| 1266 | **/ |
| 1267 | static int scsi_eh_test_devices(struct list_head *cmd_list, |
| 1268 | struct list_head *work_q, |
| 1269 | struct list_head *done_q, int try_stu) |
| 1270 | { |
| 1271 | struct scsi_cmnd *scmd, *next; |
| 1272 | struct scsi_device *sdev; |
| 1273 | int finish_cmds; |
| 1274 | |
| 1275 | while (!list_empty(cmd_list)) { |
| 1276 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); |
| 1277 | sdev = scmd->device; |
| 1278 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1279 | if (!try_stu) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1280 | if (scsi_host_eh_past_deadline(sdev->host)) { |
| 1281 | /* Push items back onto work_q */ |
| 1282 | list_splice_init(cmd_list, work_q); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1283 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1284 | sdev_printk(KERN_INFO, sdev, |
| 1285 | "%s: skip test device, past eh deadline", |
| 1286 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1287 | break; |
| 1288 | } |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1289 | } |
| 1290 | |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1291 | finish_cmds = !scsi_device_online(scmd->device) || |
| 1292 | (try_stu && !scsi_eh_try_stu(scmd) && |
| 1293 | !scsi_eh_tur(scmd)) || |
| 1294 | !scsi_eh_tur(scmd); |
| 1295 | |
| 1296 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) |
| 1297 | if (scmd->device == sdev) { |
James Bottomley | 2451079 | 2013-11-11 13:44:53 +0100 | [diff] [blame] | 1298 | if (finish_cmds && |
| 1299 | (try_stu || |
| 1300 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1301 | scsi_eh_finish_cmd(scmd, done_q); |
| 1302 | else |
| 1303 | list_move_tail(&scmd->eh_entry, work_q); |
| 1304 | } |
| 1305 | } |
| 1306 | return list_empty(work_q); |
| 1307 | } |
| 1308 | |
| 1309 | |
| 1310 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1311 | * scsi_eh_abort_cmds - abort pending commands. |
| 1312 | * @work_q: &list_head for pending commands. |
| 1313 | * @done_q: &list_head for processed commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | * |
| 1315 | * Decription: |
| 1316 | * Try and see whether or not it makes sense to try and abort the |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1317 | * running command. This only works out to be the case if we have one |
| 1318 | * command that has timed out. If the command simply failed, it makes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | * no sense to try and abort the command, since as far as the shost |
| 1320 | * adapter is concerned, it isn't running. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1321 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
| 1323 | struct list_head *done_q) |
| 1324 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1325 | struct scsi_cmnd *scmd, *next; |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1326 | LIST_HEAD(check_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | int rtn; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1328 | struct Scsi_Host *shost; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1330 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 1331 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | continue; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1333 | shost = scmd->device->host; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1334 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1335 | list_splice_init(&check_list, work_q); |
| 1336 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1337 | scmd_printk(KERN_INFO, scmd, |
| 1338 | "%s: skip aborting cmd, past eh deadline\n", |
| 1339 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1340 | return list_empty(work_q); |
| 1341 | } |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1342 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1343 | scmd_printk(KERN_INFO, scmd, |
| 1344 | "%s: aborting cmd\n", current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1345 | rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
Hannes Reinecke | 6fd046f | 2013-10-23 10:51:22 +0200 | [diff] [blame] | 1346 | if (rtn == FAILED) { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1347 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1348 | scmd_printk(KERN_INFO, scmd, |
| 1349 | "%s: aborting cmd failed\n", |
| 1350 | current->comm)); |
Hannes Reinecke | 6fd046f | 2013-10-23 10:51:22 +0200 | [diff] [blame] | 1351 | list_splice_init(&check_list, work_q); |
| 1352 | return list_empty(work_q); |
| 1353 | } |
| 1354 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
| 1355 | if (rtn == FAST_IO_FAIL) |
| 1356 | scsi_eh_finish_cmd(scmd, done_q); |
| 1357 | else |
| 1358 | list_move_tail(&scmd->eh_entry, &check_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | } |
| 1360 | |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1361 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | |
| 1364 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | * scsi_eh_try_stu - Send START_UNIT to device. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1366 | * @scmd: &scsi_cmnd to send START_UNIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | * |
| 1368 | * Return value: |
| 1369 | * 0 - Device is ready. 1 - Device NOT ready. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1370 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
| 1372 | { |
| 1373 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 1375 | if (scmd->device->allow_restart) { |
Brian King | ed773e6 | 2007-03-29 15:25:52 -0500 | [diff] [blame] | 1376 | int i, rtn = NEEDS_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
Brian King | ed773e6 | 2007-03-29 15:25:52 -0500 | [diff] [blame] | 1378 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) |
James Bottomley | 9728c08 | 2008-11-30 10:32:26 -0600 | [diff] [blame] | 1379 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
Brian King | ed773e6 | 2007-03-29 15:25:52 -0500 | [diff] [blame] | 1380 | |
Christoph Hellwig | 631c228 | 2006-07-08 20:42:15 +0200 | [diff] [blame] | 1381 | if (rtn == SUCCESS) |
| 1382 | return 0; |
| 1383 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | return 1; |
| 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * scsi_eh_stu - send START_UNIT if needed |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1390 | * @shost: &scsi host being recovered. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1391 | * @work_q: &list_head for pending commands. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1392 | * @done_q: &list_head for processed commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | * |
| 1394 | * Notes: |
| 1395 | * If commands are failing due to not ready, initializing command required, |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1396 | * try revalidating the device, which will end up sending a start unit. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1397 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | static int scsi_eh_stu(struct Scsi_Host *shost, |
| 1399 | struct list_head *work_q, |
| 1400 | struct list_head *done_q) |
| 1401 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1402 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | struct scsi_device *sdev; |
| 1404 | |
| 1405 | shost_for_each_device(sdev, shost) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1406 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1407 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1408 | sdev_printk(KERN_INFO, sdev, |
| 1409 | "%s: skip START_UNIT, past eh deadline\n", |
| 1410 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1411 | break; |
| 1412 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | stu_scmd = NULL; |
| 1414 | list_for_each_entry(scmd, work_q, eh_entry) |
| 1415 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && |
| 1416 | scsi_check_sense(scmd) == FAILED ) { |
| 1417 | stu_scmd = scmd; |
| 1418 | break; |
| 1419 | } |
| 1420 | |
| 1421 | if (!stu_scmd) |
| 1422 | continue; |
| 1423 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1424 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1425 | sdev_printk(KERN_INFO, sdev, |
| 1426 | "%s: Sending START_UNIT\n", |
| 1427 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
| 1429 | if (!scsi_eh_try_stu(stu_scmd)) { |
| 1430 | if (!scsi_device_online(sdev) || |
| 1431 | !scsi_eh_tur(stu_scmd)) { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1432 | list_for_each_entry_safe(scmd, next, |
| 1433 | work_q, eh_entry) { |
James Bottomley | 2451079 | 2013-11-11 13:44:53 +0100 | [diff] [blame] | 1434 | if (scmd->device == sdev && |
| 1435 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | scsi_eh_finish_cmd(scmd, done_q); |
| 1437 | } |
| 1438 | } |
| 1439 | } else { |
| 1440 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1441 | sdev_printk(KERN_INFO, sdev, |
| 1442 | "%s: START_UNIT failed\n", |
| 1443 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | } |
| 1445 | } |
| 1446 | |
| 1447 | return list_empty(work_q); |
| 1448 | } |
| 1449 | |
| 1450 | |
| 1451 | /** |
| 1452 | * scsi_eh_bus_device_reset - send bdr if needed |
| 1453 | * @shost: scsi host being recovered. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1454 | * @work_q: &list_head for pending commands. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1455 | * @done_q: &list_head for processed commands. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | * |
| 1457 | * Notes: |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1458 | * Try a bus device reset. Still, look to see whether we have multiple |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | * devices that are jammed or not - if we have multiple devices, it |
| 1460 | * makes no sense to try bus_device_reset - we really would need to try |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1461 | * a bus_reset instead. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1462 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
| 1464 | struct list_head *work_q, |
| 1465 | struct list_head *done_q) |
| 1466 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1467 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | struct scsi_device *sdev; |
| 1469 | int rtn; |
| 1470 | |
| 1471 | shost_for_each_device(sdev, shost) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1472 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1473 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1474 | sdev_printk(KERN_INFO, sdev, |
| 1475 | "%s: skip BDR, past eh deadline\n", |
| 1476 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1477 | break; |
| 1478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | bdr_scmd = NULL; |
| 1480 | list_for_each_entry(scmd, work_q, eh_entry) |
| 1481 | if (scmd->device == sdev) { |
| 1482 | bdr_scmd = scmd; |
| 1483 | break; |
| 1484 | } |
| 1485 | |
| 1486 | if (!bdr_scmd) |
| 1487 | continue; |
| 1488 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1489 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1490 | sdev_printk(KERN_INFO, sdev, |
| 1491 | "%s: Sending BDR\n", current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
Christof Schmitt | 2f2eb58 | 2010-03-24 16:50:30 +0100 | [diff] [blame] | 1493 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | if (!scsi_device_online(sdev) || |
Christof Schmitt | 2f2eb58 | 2010-03-24 16:50:30 +0100 | [diff] [blame] | 1495 | rtn == FAST_IO_FAIL || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | !scsi_eh_tur(bdr_scmd)) { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1497 | list_for_each_entry_safe(scmd, next, |
| 1498 | work_q, eh_entry) { |
James Bottomley | 2451079 | 2013-11-11 13:44:53 +0100 | [diff] [blame] | 1499 | if (scmd->device == sdev && |
| 1500 | scsi_eh_action(scmd, rtn) != FAILED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | scsi_eh_finish_cmd(scmd, |
| 1502 | done_q); |
| 1503 | } |
| 1504 | } |
| 1505 | } else { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1506 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1507 | sdev_printk(KERN_INFO, sdev, |
| 1508 | "%s: BDR failed\n", current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | } |
| 1510 | } |
| 1511 | |
| 1512 | return list_empty(work_q); |
| 1513 | } |
| 1514 | |
| 1515 | /** |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1516 | * scsi_eh_target_reset - send target reset if needed |
| 1517 | * @shost: scsi host being recovered. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1518 | * @work_q: &list_head for pending commands. |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1519 | * @done_q: &list_head for processed commands. |
| 1520 | * |
| 1521 | * Notes: |
| 1522 | * Try a target reset. |
| 1523 | */ |
| 1524 | static int scsi_eh_target_reset(struct Scsi_Host *shost, |
| 1525 | struct list_head *work_q, |
| 1526 | struct list_head *done_q) |
| 1527 | { |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1528 | LIST_HEAD(tmp_list); |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1529 | LIST_HEAD(check_list); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1530 | |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1531 | list_splice_init(work_q, &tmp_list); |
| 1532 | |
| 1533 | while (!list_empty(&tmp_list)) { |
| 1534 | struct scsi_cmnd *next, *scmd; |
| 1535 | int rtn; |
| 1536 | unsigned int id; |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1537 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1538 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1539 | /* push back on work queue for further processing */ |
| 1540 | list_splice_init(&check_list, work_q); |
| 1541 | list_splice_init(&tmp_list, work_q); |
| 1542 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1543 | shost_printk(KERN_INFO, shost, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1544 | "%s: Skip target reset, past eh deadline\n", |
| 1545 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1546 | return list_empty(work_q); |
| 1547 | } |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1548 | |
| 1549 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); |
| 1550 | id = scmd_id(scmd); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1551 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1552 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1553 | shost_printk(KERN_INFO, shost, |
| 1554 | "%s: Sending target reset to target %d\n", |
| 1555 | current->comm, id)); |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1556 | rtn = scsi_try_target_reset(scmd); |
| 1557 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1558 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1559 | shost_printk(KERN_INFO, shost, |
| 1560 | "%s: Target reset failed" |
| 1561 | " target: %d\n", |
| 1562 | current->comm, id)); |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1563 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
| 1564 | if (scmd_id(scmd) != id) |
| 1565 | continue; |
| 1566 | |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1567 | if (rtn == SUCCESS) |
| 1568 | list_move_tail(&scmd->eh_entry, &check_list); |
| 1569 | else if (rtn == FAST_IO_FAIL) |
James Bottomley | 98db519 | 2010-10-25 15:53:41 -0500 | [diff] [blame] | 1570 | scsi_eh_finish_cmd(scmd, done_q); |
| 1571 | else |
| 1572 | /* push back on work queue for further processing */ |
| 1573 | list_move(&scmd->eh_entry, work_q); |
| 1574 | } |
| 1575 | } |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1576 | |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1577 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 1578 | } |
| 1579 | |
| 1580 | /** |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1581 | * scsi_eh_bus_reset - send a bus reset |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1582 | * @shost: &scsi host being recovered. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1583 | * @work_q: &list_head for pending commands. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1584 | * @done_q: &list_head for processed commands. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1585 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
| 1587 | struct list_head *work_q, |
| 1588 | struct list_head *done_q) |
| 1589 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1590 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1591 | LIST_HEAD(check_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | unsigned int channel; |
| 1593 | int rtn; |
| 1594 | |
| 1595 | /* |
| 1596 | * we really want to loop over the various channels, and do this on |
| 1597 | * a channel by channel basis. we should also check to see if any |
| 1598 | * of the failed commands are on soft_reset devices, and if so, skip |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1599 | * the reset. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | */ |
| 1601 | |
| 1602 | for (channel = 0; channel <= shost->max_channel; channel++) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1603 | if (scsi_host_eh_past_deadline(shost)) { |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1604 | list_splice_init(&check_list, work_q); |
| 1605 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1606 | shost_printk(KERN_INFO, shost, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 1607 | "%s: skip BRST, past eh deadline\n", |
| 1608 | current->comm)); |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1609 | return list_empty(work_q); |
| 1610 | } |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | chan_scmd = NULL; |
| 1613 | list_for_each_entry(scmd, work_q, eh_entry) { |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1614 | if (channel == scmd_channel(scmd)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | chan_scmd = scmd; |
| 1616 | break; |
| 1617 | /* |
| 1618 | * FIXME add back in some support for |
| 1619 | * soft_reset devices. |
| 1620 | */ |
| 1621 | } |
| 1622 | } |
| 1623 | |
| 1624 | if (!chan_scmd) |
| 1625 | continue; |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1626 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1627 | shost_printk(KERN_INFO, shost, |
| 1628 | "%s: Sending BRST chan: %d\n", |
| 1629 | current->comm, channel)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | rtn = scsi_try_bus_reset(chan_scmd); |
Christof Schmitt | 2f2eb58 | 2010-03-24 16:50:30 +0100 | [diff] [blame] | 1631 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1632 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1633 | if (channel == scmd_channel(scmd)) { |
| 1634 | if (rtn == FAST_IO_FAIL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | scsi_eh_finish_cmd(scmd, |
| 1636 | done_q); |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1637 | else |
| 1638 | list_move_tail(&scmd->eh_entry, |
| 1639 | &check_list); |
| 1640 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | } |
| 1642 | } else { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1643 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1644 | shost_printk(KERN_INFO, shost, |
| 1645 | "%s: BRST failed chan: %d\n", |
| 1646 | current->comm, channel)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | } |
| 1648 | } |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1649 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
| 1652 | /** |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1653 | * scsi_eh_host_reset - send a host reset |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1654 | * @shost: host to be reset. |
| 1655 | * @work_q: &list_head for pending commands. |
| 1656 | * @done_q: &list_head for processed commands. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1657 | */ |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1658 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
| 1659 | struct list_head *work_q, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | struct list_head *done_q) |
| 1661 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1662 | struct scsi_cmnd *scmd, *next; |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1663 | LIST_HEAD(check_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | int rtn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | |
| 1666 | if (!list_empty(work_q)) { |
| 1667 | scmd = list_entry(work_q->next, |
| 1668 | struct scsi_cmnd, eh_entry); |
| 1669 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1670 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1671 | shost_printk(KERN_INFO, shost, |
| 1672 | "%s: Sending HRST\n", |
| 1673 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | |
| 1675 | rtn = scsi_try_host_reset(scmd); |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1676 | if (rtn == SUCCESS) { |
| 1677 | list_splice_init(work_q, &check_list); |
| 1678 | } else if (rtn == FAST_IO_FAIL) { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1679 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | scsi_eh_finish_cmd(scmd, done_q); |
| 1681 | } |
| 1682 | } else { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1683 | SCSI_LOG_ERROR_RECOVERY(3, |
| 1684 | shost_printk(KERN_INFO, shost, |
| 1685 | "%s: HRST failed\n", |
| 1686 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | } |
| 1688 | } |
David Jeffery | 3eef625 | 2011-05-19 14:41:12 -0400 | [diff] [blame] | 1689 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | } |
| 1691 | |
| 1692 | /** |
| 1693 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 1694 | * @work_q: &list_head for pending commands. |
| 1695 | * @done_q: &list_head for processed commands. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1696 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
| 1698 | struct list_head *done_q) |
| 1699 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1700 | struct scsi_cmnd *scmd, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 1702 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
Matthew Wilcox | 31765d7 | 2007-08-17 11:02:10 -0600 | [diff] [blame] | 1703 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
| 1704 | "not ready after error recovery\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
Christoph Hellwig | 3111b0d | 2005-06-19 13:43:26 +0200 | [diff] [blame] | 1706 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | /* |
| 1708 | * FIXME: Handle lost cmds. |
| 1709 | */ |
| 1710 | } |
| 1711 | scsi_eh_finish_cmd(scmd, done_q); |
| 1712 | } |
| 1713 | return; |
| 1714 | } |
| 1715 | |
| 1716 | /** |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1717 | * scsi_noretry_cmd - determine if command should be failed fast |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1718 | * @scmd: SCSI cmd to examine. |
| 1719 | */ |
| 1720 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) |
| 1721 | { |
| 1722 | switch (host_byte(scmd->result)) { |
| 1723 | case DID_OK: |
| 1724 | break; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1725 | case DID_TIME_OUT: |
| 1726 | goto check_type; |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1727 | case DID_BUS_BUSY: |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 1728 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1729 | case DID_PARITY: |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 1730 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1731 | case DID_ERROR: |
| 1732 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && |
| 1733 | status_byte(scmd->result) == RESERVATION_CONFLICT) |
| 1734 | return 0; |
| 1735 | /* fall through */ |
| 1736 | case DID_SOFT_ERROR: |
Christoph Hellwig | 33659eb | 2010-08-07 18:17:56 +0200 | [diff] [blame] | 1737 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1738 | } |
| 1739 | |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1740 | if (status_byte(scmd->result) != CHECK_CONDITION) |
| 1741 | return 0; |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1742 | |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1743 | check_type: |
| 1744 | /* |
| 1745 | * assume caller has checked sense and determined |
| 1746 | * the check condition was retryable. |
| 1747 | */ |
| 1748 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
| 1749 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) |
| 1750 | return 1; |
| 1751 | else |
| 1752 | return 0; |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1753 | } |
| 1754 | |
| 1755 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | * scsi_decide_disposition - Disposition a cmd on return from LLD. |
| 1757 | * @scmd: SCSI cmd to examine. |
| 1758 | * |
| 1759 | * Notes: |
| 1760 | * This is *only* called when we are examining the status after sending |
| 1761 | * out the actual data command. any commands that are queued for error |
| 1762 | * recovery (e.g. test_unit_ready) do *not* come through here. |
| 1763 | * |
| 1764 | * When this routine returns failed, it means the error handler thread |
| 1765 | * is woken. In cases where the error code indicates an error that |
| 1766 | * doesn't require the error handler read (i.e. we don't need to |
| 1767 | * abort/reset), this function should return SUCCESS. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1768 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
| 1770 | { |
| 1771 | int rtn; |
| 1772 | |
| 1773 | /* |
| 1774 | * if the device is offline, then we clearly just pass the result back |
| 1775 | * up to the top level. |
| 1776 | */ |
| 1777 | if (!scsi_device_online(scmd->device)) { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 1778 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
| 1779 | "%s: device offline - report as SUCCESS\n", __func__)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | return SUCCESS; |
| 1781 | } |
| 1782 | |
| 1783 | /* |
| 1784 | * first check the host byte, to see if there is anything in there |
| 1785 | * that would indicate what we need to do. |
| 1786 | */ |
| 1787 | switch (host_byte(scmd->result)) { |
| 1788 | case DID_PASSTHROUGH: |
| 1789 | /* |
| 1790 | * no matter what, pass this through to the upper layer. |
| 1791 | * nuke this special code so that it looks like we are saying |
| 1792 | * did_ok. |
| 1793 | */ |
| 1794 | scmd->result &= 0xff00ffff; |
| 1795 | return SUCCESS; |
| 1796 | case DID_OK: |
| 1797 | /* |
| 1798 | * looks good. drop through, and check the next byte. |
| 1799 | */ |
| 1800 | break; |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1801 | case DID_ABORT: |
| 1802 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { |
Ulrich Obergfell | 8922a90 | 2014-06-04 13:34:57 +0200 | [diff] [blame] | 1803 | set_host_byte(scmd, DID_TIME_OUT); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 1804 | return SUCCESS; |
| 1805 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | case DID_NO_CONNECT: |
| 1807 | case DID_BAD_TARGET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | /* |
| 1809 | * note - this means that we just report the status back |
| 1810 | * to the top level driver, not that we actually think |
| 1811 | * that it indicates SUCCESS. |
| 1812 | */ |
| 1813 | return SUCCESS; |
| 1814 | /* |
| 1815 | * when the low level driver returns did_soft_error, |
Jesper Juhl | 0bf8c86 | 2011-03-21 20:47:31 +0100 | [diff] [blame] | 1816 | * it is responsible for keeping an internal retry counter |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | * in order to avoid endless loops (db) |
| 1818 | * |
| 1819 | * actually this is a bug in this function here. we should |
| 1820 | * be mindful of the maximum number of retries specified |
| 1821 | * and not get stuck in a loop. |
| 1822 | */ |
| 1823 | case DID_SOFT_ERROR: |
| 1824 | goto maybe_retry; |
| 1825 | case DID_IMM_RETRY: |
| 1826 | return NEEDS_RETRY; |
| 1827 | |
| bf34191 | 2005-04-12 17:49:09 -0500 | [diff] [blame] | 1828 | case DID_REQUEUE: |
| 1829 | return ADD_TO_MLQUEUE; |
Mike Christie | a4dfaa6 | 2008-08-19 18:45:25 -0500 | [diff] [blame] | 1830 | case DID_TRANSPORT_DISRUPTED: |
| 1831 | /* |
| 1832 | * LLD/transport was disrupted during processing of the IO. |
| 1833 | * The transport class is now blocked/blocking, |
| 1834 | * and the transport will decide what to do with the IO |
Mike Christie | 939c228 | 2008-11-04 19:47:19 -0600 | [diff] [blame] | 1835 | * based on its timers and recovery capablilities if |
| 1836 | * there are enough retries. |
Mike Christie | a4dfaa6 | 2008-08-19 18:45:25 -0500 | [diff] [blame] | 1837 | */ |
Mike Christie | 939c228 | 2008-11-04 19:47:19 -0600 | [diff] [blame] | 1838 | goto maybe_retry; |
Mike Christie | a4dfaa6 | 2008-08-19 18:45:25 -0500 | [diff] [blame] | 1839 | case DID_TRANSPORT_FAILFAST: |
| 1840 | /* |
| 1841 | * The transport decided to failfast the IO (most likely |
| 1842 | * the fast io fail tmo fired), so send IO directly upwards. |
| 1843 | */ |
| 1844 | return SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | case DID_ERROR: |
| 1846 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && |
| 1847 | status_byte(scmd->result) == RESERVATION_CONFLICT) |
| 1848 | /* |
| 1849 | * execute reservation conflict processing code |
| 1850 | * lower down |
| 1851 | */ |
| 1852 | break; |
| 1853 | /* fallthrough */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | case DID_BUS_BUSY: |
| 1855 | case DID_PARITY: |
| 1856 | goto maybe_retry; |
| 1857 | case DID_TIME_OUT: |
| 1858 | /* |
| 1859 | * when we scan the bus, we get timeout messages for |
| 1860 | * these commands if there is no device available. |
| 1861 | * other hosts report did_no_connect for the same thing. |
| 1862 | */ |
| 1863 | if ((scmd->cmnd[0] == TEST_UNIT_READY || |
| 1864 | scmd->cmnd[0] == INQUIRY)) { |
| 1865 | return SUCCESS; |
| 1866 | } else { |
| 1867 | return FAILED; |
| 1868 | } |
| 1869 | case DID_RESET: |
| 1870 | return SUCCESS; |
| 1871 | default: |
| 1872 | return FAILED; |
| 1873 | } |
| 1874 | |
| 1875 | /* |
| 1876 | * next, check the message byte. |
| 1877 | */ |
| 1878 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) |
| 1879 | return FAILED; |
| 1880 | |
| 1881 | /* |
| 1882 | * check the status byte to see if this indicates anything special. |
| 1883 | */ |
| 1884 | switch (status_byte(scmd->result)) { |
| 1885 | case QUEUE_FULL: |
Mike Christie | 42a6a91 | 2009-10-15 17:46:44 -0700 | [diff] [blame] | 1886 | scsi_handle_queue_full(scmd->device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | /* |
| 1888 | * the case of trying to send too many commands to a |
| 1889 | * tagged queueing device. |
| 1890 | */ |
| 1891 | case BUSY: |
| 1892 | /* |
| 1893 | * device can't talk to us at the moment. Should only |
| 1894 | * occur (SAM-3) when the task queue is empty, so will cause |
| 1895 | * the empty queue handling to trigger a stall in the |
| 1896 | * device. |
| 1897 | */ |
| 1898 | return ADD_TO_MLQUEUE; |
| 1899 | case GOOD: |
Ewan D. Milne | 279afdf | 2013-08-08 15:07:48 -0400 | [diff] [blame] | 1900 | if (scmd->cmnd[0] == REPORT_LUNS) |
| 1901 | scmd->device->sdev_target->expecting_lun_change = 0; |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 1902 | scsi_handle_queue_ramp_up(scmd->device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | case COMMAND_TERMINATED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | return SUCCESS; |
Vladislav Bolkhovitin | a9b589d | 2008-11-06 13:57:52 +0300 | [diff] [blame] | 1905 | case TASK_ABORTED: |
| 1906 | goto maybe_retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | case CHECK_CONDITION: |
| 1908 | rtn = scsi_check_sense(scmd); |
| 1909 | if (rtn == NEEDS_RETRY) |
| 1910 | goto maybe_retry; |
| 1911 | /* if rtn == FAILED, we have no sense information; |
| 1912 | * returning FAILED will wake the error handler thread |
| 1913 | * to collect the sense and redo the decide |
| 1914 | * disposition */ |
| 1915 | return rtn; |
| 1916 | case CONDITION_GOOD: |
| 1917 | case INTERMEDIATE_GOOD: |
| 1918 | case INTERMEDIATE_C_GOOD: |
| 1919 | case ACA_ACTIVE: |
| 1920 | /* |
| 1921 | * who knows? FIXME(eric) |
| 1922 | */ |
| 1923 | return SUCCESS; |
| 1924 | |
| 1925 | case RESERVATION_CONFLICT: |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 1926 | sdev_printk(KERN_INFO, scmd->device, |
| 1927 | "reservation conflict\n"); |
Moger, Babu | 2082ebc | 2012-01-24 20:38:46 +0000 | [diff] [blame] | 1928 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | return SUCCESS; /* causes immediate i/o error */ |
| 1930 | default: |
| 1931 | return FAILED; |
| 1932 | } |
| 1933 | return FAILED; |
| 1934 | |
| 1935 | maybe_retry: |
| 1936 | |
| 1937 | /* we requeue for retry because the error was retryable, and |
| 1938 | * the request was not marked fast fail. Note that above, |
| 1939 | * even if the request is marked fast fail, we still requeue |
| 1940 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ |
Brian King | 8884efa | 2006-02-24 17:10:04 -0600 | [diff] [blame] | 1941 | if ((++scmd->retries) <= scmd->allowed |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 1942 | && !scsi_noretry_cmd(scmd)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | return NEEDS_RETRY; |
| 1944 | } else { |
| 1945 | /* |
| 1946 | * no more retries - report this one back to upper level. |
| 1947 | */ |
| 1948 | return SUCCESS; |
| 1949 | } |
| 1950 | } |
| 1951 | |
FUJITA Tomonori | f078727 | 2008-12-14 01:23:45 +0900 | [diff] [blame] | 1952 | static void eh_lock_door_done(struct request *req, int uptodate) |
| 1953 | { |
| 1954 | __blk_put_request(req->q, req); |
| 1955 | } |
| 1956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | * scsi_eh_lock_door - Prevent medium removal for the specified device |
| 1959 | * @sdev: SCSI device to prevent medium removal |
| 1960 | * |
| 1961 | * Locking: |
James Bottomley | 91bc31f | 2009-05-17 09:30:48 -0500 | [diff] [blame] | 1962 | * We must be called from process context. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | * |
| 1964 | * Notes: |
| 1965 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the |
| 1966 | * head of the devices request queue, and continue. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1967 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
| 1969 | { |
FUJITA Tomonori | f078727 | 2008-12-14 01:23:45 +0900 | [diff] [blame] | 1970 | struct request *req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
James Bottomley | 91bc31f | 2009-05-17 09:30:48 -0500 | [diff] [blame] | 1972 | /* |
Mel Gorman | 71baba4 | 2015-11-06 16:28:28 -0800 | [diff] [blame] | 1973 | * blk_get_request with GFP_KERNEL (__GFP_RECLAIM) sleeps until a |
James Bottomley | 91bc31f | 2009-05-17 09:30:48 -0500 | [diff] [blame] | 1974 | * request becomes available |
| 1975 | */ |
FUJITA Tomonori | f078727 | 2008-12-14 01:23:45 +0900 | [diff] [blame] | 1976 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 1977 | if (IS_ERR(req)) |
Joe Lawrence | eb571ee | 2014-07-02 15:35:16 -0400 | [diff] [blame] | 1978 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | |
Jens Axboe | f27b087 | 2014-06-06 07:57:37 -0600 | [diff] [blame] | 1980 | blk_rq_set_block_pc(req); |
| 1981 | |
FUJITA Tomonori | f078727 | 2008-12-14 01:23:45 +0900 | [diff] [blame] | 1982 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
| 1983 | req->cmd[1] = 0; |
| 1984 | req->cmd[2] = 0; |
| 1985 | req->cmd[3] = 0; |
| 1986 | req->cmd[4] = SCSI_REMOVAL_PREVENT; |
| 1987 | req->cmd[5] = 0; |
| 1988 | |
| 1989 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
| 1990 | |
FUJITA Tomonori | f078727 | 2008-12-14 01:23:45 +0900 | [diff] [blame] | 1991 | req->cmd_flags |= REQ_QUIET; |
| 1992 | req->timeout = 10 * HZ; |
| 1993 | req->retries = 5; |
| 1994 | |
| 1995 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | } |
| 1997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | /** |
| 1999 | * scsi_restart_operations - restart io operations to the specified host. |
| 2000 | * @shost: Host we are restarting. |
| 2001 | * |
| 2002 | * Notes: |
| 2003 | * When we entered the error handler, we blocked all further i/o to |
| 2004 | * this device. we need to 'reverse' this process. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2005 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | static void scsi_restart_operations(struct Scsi_Host *shost) |
| 2007 | { |
| 2008 | struct scsi_device *sdev; |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 2009 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | |
| 2011 | /* |
| 2012 | * If the door was locked, we need to insert a door lock request |
| 2013 | * onto the head of the SCSI request queue for the device. There |
| 2014 | * is no point trying to lock the door of an off-line device. |
| 2015 | */ |
| 2016 | shost_for_each_device(sdev, shost) { |
Christoph Hellwig | 4837927 | 2014-11-03 19:36:40 +0100 | [diff] [blame] | 2017 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | scsi_eh_lock_door(sdev); |
Christoph Hellwig | 4837927 | 2014-11-03 19:36:40 +0100 | [diff] [blame] | 2019 | sdev->was_reset = 0; |
| 2020 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } |
| 2022 | |
| 2023 | /* |
| 2024 | * next free up anything directly waiting upon the host. this |
| 2025 | * will be requests for character device operations, and also for |
| 2026 | * ioctls to queued block devices. |
| 2027 | */ |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 2028 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2029 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | |
James Bottomley | 939647e | 2005-09-18 15:05:20 -0500 | [diff] [blame] | 2031 | spin_lock_irqsave(shost->host_lock, flags); |
| 2032 | if (scsi_host_set_state(shost, SHOST_RUNNING)) |
| 2033 | if (scsi_host_set_state(shost, SHOST_CANCEL)) |
| 2034 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); |
| 2035 | spin_unlock_irqrestore(shost->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | |
| 2037 | wake_up(&shost->host_wait); |
| 2038 | |
| 2039 | /* |
| 2040 | * finally we need to re-initiate requests that may be pending. we will |
| 2041 | * have had everything blocked while error handling is taking place, and |
| 2042 | * now that error recovery is done, we will need to ensure that these |
| 2043 | * requests are started. |
| 2044 | */ |
| 2045 | scsi_run_host_queues(shost); |
Dan Williams | 57fc2e3 | 2012-06-21 23:25:32 -0700 | [diff] [blame] | 2046 | |
| 2047 | /* |
| 2048 | * if eh is active and host_eh_scheduled is pending we need to re-run |
| 2049 | * recovery. we do this check after scsi_run_host_queues() to allow |
| 2050 | * everything pent up since the last eh run a chance to make forward |
| 2051 | * progress before we sync again. Either we'll immediately re-run |
| 2052 | * recovery or scsi_device_unbusy() will wake us again when these |
| 2053 | * pending commands complete. |
| 2054 | */ |
| 2055 | spin_lock_irqsave(shost->host_lock, flags); |
| 2056 | if (shost->host_eh_scheduled) |
| 2057 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
| 2058 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); |
| 2059 | spin_unlock_irqrestore(shost->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * scsi_eh_ready_devs - check device ready state and recover if not. |
Randy Dunlap | 74cf298 | 2014-08-16 14:15:11 -0700 | [diff] [blame] | 2064 | * @shost: host to be recovered. |
| 2065 | * @work_q: &list_head for pending commands. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 2066 | * @done_q: &list_head for processed commands. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2067 | */ |
Darrick J. Wong | dca84e4 | 2007-01-26 14:08:49 -0800 | [diff] [blame] | 2068 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
| 2069 | struct list_head *work_q, |
| 2070 | struct list_head *done_q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | { |
| 2072 | if (!scsi_eh_stu(shost, work_q, done_q)) |
| 2073 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2074 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
| 2075 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2076 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2077 | scsi_eh_offline_sdevs(work_q, |
| 2078 | done_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | } |
Darrick J. Wong | dca84e4 | 2007-01-26 14:08:49 -0800 | [diff] [blame] | 2080 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | |
| 2082 | /** |
| 2083 | * scsi_eh_flush_done_q - finish processed commands or retry them. |
| 2084 | * @done_q: list_head of processed commands. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2085 | */ |
Tejun Heo | 041c5fc | 2006-01-23 13:09:36 +0900 | [diff] [blame] | 2086 | void scsi_eh_flush_done_q(struct list_head *done_q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | { |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 2088 | struct scsi_cmnd *scmd, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
Christoph Hellwig | 937abeaa | 2005-06-19 13:43:56 +0200 | [diff] [blame] | 2090 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
| 2091 | list_del_init(&scmd->eh_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | if (scsi_device_online(scmd->device) && |
Mike Christie | 4a27446 | 2008-08-19 18:45:31 -0500 | [diff] [blame] | 2093 | !scsi_noretry_cmd(scmd) && |
Brian King | 8884efa | 2006-02-24 17:10:04 -0600 | [diff] [blame] | 2094 | (++scmd->retries <= scmd->allowed)) { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2095 | SCSI_LOG_ERROR_RECOVERY(3, |
| 2096 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 2097 | "%s: flush retry cmd\n", |
| 2098 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
| 2100 | } else { |
Patrick Mansfield | 793698c | 2005-05-16 17:42:15 -0700 | [diff] [blame] | 2101 | /* |
| 2102 | * If just we got sense for the device (called |
| 2103 | * scsi_eh_get_sense), scmd->result is already |
| 2104 | * set, do not set DRIVER_TIMEOUT. |
| 2105 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | if (!scmd->result) |
| 2107 | scmd->result |= (DRIVER_TIMEOUT << 24); |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2108 | SCSI_LOG_ERROR_RECOVERY(3, |
| 2109 | scmd_printk(KERN_INFO, scmd, |
Hannes Reinecke | 470613b | 2015-01-08 07:43:50 +0100 | [diff] [blame] | 2110 | "%s: flush finish cmd\n", |
| 2111 | current->comm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | scsi_finish_command(scmd); |
| 2113 | } |
| 2114 | } |
| 2115 | } |
Tejun Heo | 041c5fc | 2006-01-23 13:09:36 +0900 | [diff] [blame] | 2116 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | |
| 2118 | /** |
| 2119 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. |
| 2120 | * @shost: Host to unjam. |
| 2121 | * |
| 2122 | * Notes: |
| 2123 | * When we come in here, we *know* that all commands on the bus have |
| 2124 | * either completed, failed or timed out. we also know that no further |
| 2125 | * commands are being sent to the host, so things are relatively quiet |
| 2126 | * and we have freedom to fiddle with things as we wish. |
| 2127 | * |
| 2128 | * This is only the *default* implementation. it is possible for |
| 2129 | * individual drivers to supply their own version of this function, and |
| 2130 | * if the maintainer wishes to do this, it is strongly suggested that |
| 2131 | * this function be taken as a template and modified. this function |
| 2132 | * was designed to correctly handle problems for about 95% of the |
| 2133 | * different cases out there, and it should always provide at least a |
| 2134 | * reasonable amount of error recovery. |
| 2135 | * |
| 2136 | * Any command marked 'failed' or 'timeout' must eventually have |
| 2137 | * scsi_finish_cmd() called for it. we do all of the retry stuff |
| 2138 | * here, so when we restart the host after we return it should have an |
| 2139 | * empty queue. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2140 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | static void scsi_unjam_host(struct Scsi_Host *shost) |
| 2142 | { |
| 2143 | unsigned long flags; |
| 2144 | LIST_HEAD(eh_work_q); |
| 2145 | LIST_HEAD(eh_done_q); |
| 2146 | |
| 2147 | spin_lock_irqsave(shost->host_lock, flags); |
| 2148 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); |
| 2149 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 2150 | |
| 2151 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); |
| 2152 | |
| 2153 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) |
| 2154 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) |
| 2155 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
| 2156 | |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 2157 | spin_lock_irqsave(shost->host_lock, flags); |
Ren Mingxin | bb3b621 | 2013-11-11 13:44:56 +0100 | [diff] [blame] | 2158 | if (shost->eh_deadline != -1) |
Hannes Reinecke | b456202 | 2013-10-23 10:51:21 +0200 | [diff] [blame] | 2159 | shost->last_reset = 0; |
| 2160 | spin_unlock_irqrestore(shost->host_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | scsi_eh_flush_done_q(&eh_done_q); |
| 2162 | } |
| 2163 | |
| 2164 | /** |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2165 | * scsi_error_handler - SCSI error handler thread |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | * @data: Host for which we are running. |
| 2167 | * |
| 2168 | * Notes: |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2169 | * This is the main error handling loop. This is run as a kernel thread |
| 2170 | * for every SCSI host and handles all error handling activity. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2171 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | int scsi_error_handler(void *data) |
| 2173 | { |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2174 | struct Scsi_Host *shost = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | /* |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2177 | * We use TASK_INTERRUPTIBLE so that the thread is not |
| 2178 | * counted against the load average as a running process. |
| 2179 | * We never actually get interrupted because kthread_run |
Frederik Schwarzer | c03264a | 2008-12-23 00:54:00 +0100 | [diff] [blame] | 2180 | * disables signal delivery for the created thread. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | */ |
Michal Hocko | 537b604 | 2015-08-27 20:16:37 +0200 | [diff] [blame] | 2182 | while (true) { |
| 2183 | /* |
| 2184 | * The sequence in kthread_stop() sets the stop flag first |
| 2185 | * then wakes the process. To avoid missed wakeups, the task |
| 2186 | * should always be in a non running state before the stop |
| 2187 | * flag is checked |
| 2188 | */ |
Dan Williams | b9d5c6b | 2012-06-21 23:25:42 -0700 | [diff] [blame] | 2189 | set_current_state(TASK_INTERRUPTIBLE); |
Michal Hocko | 537b604 | 2015-08-27 20:16:37 +0200 | [diff] [blame] | 2190 | if (kthread_should_stop()) |
| 2191 | break; |
| 2192 | |
Tejun Heo | ee7863b | 2006-05-15 20:57:20 +0900 | [diff] [blame] | 2193 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
Christoph Hellwig | 7466501 | 2014-01-22 15:29:29 +0100 | [diff] [blame] | 2194 | shost->host_failed != atomic_read(&shost->host_busy)) { |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2195 | SCSI_LOG_ERROR_RECOVERY(1, |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2196 | shost_printk(KERN_INFO, shost, |
| 2197 | "scsi_eh_%d: sleeping\n", |
| 2198 | shost->host_no)); |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 2199 | schedule(); |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 2200 | continue; |
| 2201 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 2203 | __set_current_state(TASK_RUNNING); |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2204 | SCSI_LOG_ERROR_RECOVERY(1, |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2205 | shost_printk(KERN_INFO, shost, |
| 2206 | "scsi_eh_%d: waking up %d/%d/%d\n", |
| 2207 | shost->host_no, shost->host_eh_scheduled, |
Christoph Hellwig | 7466501 | 2014-01-22 15:29:29 +0100 | [diff] [blame] | 2208 | shost->host_failed, |
| 2209 | atomic_read(&shost->host_busy))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | /* |
| 2212 | * We have a host that is failing for some reason. Figure out |
| 2213 | * what we need to do to get it up and online again (if we can). |
| 2214 | * If we fail, we end up taking the thing offline. |
| 2215 | */ |
Lin Ming | ae0751f | 2011-12-05 09:20:24 +0800 | [diff] [blame] | 2216 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2217 | SCSI_LOG_ERROR_RECOVERY(1, |
Hannes Reinecke | a222b1e | 2014-10-24 14:27:02 +0200 | [diff] [blame] | 2218 | shost_printk(KERN_ERR, shost, |
| 2219 | "scsi_eh_%d: unable to autoresume\n", |
| 2220 | shost->host_no)); |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2221 | continue; |
| 2222 | } |
| 2223 | |
Christoph Hellwig | 9227c33 | 2006-04-01 19:21:04 +0200 | [diff] [blame] | 2224 | if (shost->transportt->eh_strategy_handler) |
| 2225 | shost->transportt->eh_strategy_handler(shost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | else |
| 2227 | scsi_unjam_host(shost); |
| 2228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2229 | /* |
| 2230 | * Note - if the above fails completely, the action is to take |
| 2231 | * individual devices offline and flush the queue of any |
| 2232 | * outstanding requests that may have been pending. When we |
| 2233 | * restart, we restart any I/O to any other devices on the bus |
| 2234 | * which are still online. |
| 2235 | */ |
| 2236 | scsi_restart_operations(shost); |
Lin Ming | ae0751f | 2011-12-05 09:20:24 +0800 | [diff] [blame] | 2237 | if (!shost->eh_noresume) |
| 2238 | scsi_autopm_put_host(shost); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
Steven Rostedt | 461a0ff | 2005-10-19 08:22:13 -0400 | [diff] [blame] | 2240 | __set_current_state(TASK_RUNNING); |
| 2241 | |
Christoph Hellwig | ad42eb1 | 2005-10-29 01:01:55 +0200 | [diff] [blame] | 2242 | SCSI_LOG_ERROR_RECOVERY(1, |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2243 | shost_printk(KERN_INFO, shost, |
| 2244 | "Error handler scsi_eh_%d exiting\n", |
| 2245 | shost->host_no)); |
James Bottomley | 3ed7a470 | 2005-09-19 09:50:04 -0500 | [diff] [blame] | 2246 | shost->ehandler = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | return 0; |
| 2248 | } |
| 2249 | |
| 2250 | /* |
| 2251 | * Function: scsi_report_bus_reset() |
| 2252 | * |
| 2253 | * Purpose: Utility function used by low-level drivers to report that |
| 2254 | * they have observed a bus reset on the bus being handled. |
| 2255 | * |
| 2256 | * Arguments: shost - Host in question |
| 2257 | * channel - channel on which reset was observed. |
| 2258 | * |
| 2259 | * Returns: Nothing |
| 2260 | * |
| 2261 | * Lock status: Host lock must be held. |
| 2262 | * |
| 2263 | * Notes: This only needs to be called if the reset is one which |
| 2264 | * originates from an unknown location. Resets originated |
| 2265 | * by the mid-level itself don't need to call this, but there |
| 2266 | * should be no harm. |
| 2267 | * |
| 2268 | * The main purpose of this is to make sure that a CHECK_CONDITION |
| 2269 | * is properly treated. |
| 2270 | */ |
| 2271 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) |
| 2272 | { |
| 2273 | struct scsi_device *sdev; |
| 2274 | |
| 2275 | __shost_for_each_device(sdev, shost) { |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2276 | if (channel == sdev_channel(sdev)) |
| 2277 | __scsi_report_device_reset(sdev, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | } |
| 2279 | } |
| 2280 | EXPORT_SYMBOL(scsi_report_bus_reset); |
| 2281 | |
| 2282 | /* |
| 2283 | * Function: scsi_report_device_reset() |
| 2284 | * |
| 2285 | * Purpose: Utility function used by low-level drivers to report that |
| 2286 | * they have observed a device reset on the device being handled. |
| 2287 | * |
| 2288 | * Arguments: shost - Host in question |
| 2289 | * channel - channel on which reset was observed |
| 2290 | * target - target on which reset was observed |
| 2291 | * |
| 2292 | * Returns: Nothing |
| 2293 | * |
| 2294 | * Lock status: Host lock must be held |
| 2295 | * |
| 2296 | * Notes: This only needs to be called if the reset is one which |
| 2297 | * originates from an unknown location. Resets originated |
| 2298 | * by the mid-level itself don't need to call this, but there |
| 2299 | * should be no harm. |
| 2300 | * |
| 2301 | * The main purpose of this is to make sure that a CHECK_CONDITION |
| 2302 | * is properly treated. |
| 2303 | */ |
| 2304 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) |
| 2305 | { |
| 2306 | struct scsi_device *sdev; |
| 2307 | |
| 2308 | __shost_for_each_device(sdev, shost) { |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 2309 | if (channel == sdev_channel(sdev) && |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2310 | target == sdev_id(sdev)) |
| 2311 | __scsi_report_device_reset(sdev, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | } |
| 2313 | } |
| 2314 | EXPORT_SYMBOL(scsi_report_device_reset); |
| 2315 | |
| 2316 | static void |
| 2317 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) |
| 2318 | { |
| 2319 | } |
| 2320 | |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2321 | /** |
| 2322 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device |
| 2323 | * @dev: scsi_device to operate on |
| 2324 | * @arg: reset type (see sg.h) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | */ |
| 2326 | int |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2327 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | { |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2329 | struct scsi_cmnd *scmd; |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2330 | struct Scsi_Host *shost = dev->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2331 | struct request req; |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2332 | unsigned long flags; |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2333 | int error = 0, rtn, val; |
| 2334 | |
| 2335 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
| 2336 | return -EACCES; |
| 2337 | |
| 2338 | error = get_user(val, arg); |
| 2339 | if (error) |
| 2340 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2342 | if (scsi_autopm_get_host(shost) < 0) |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2343 | return -EIO; |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2344 | |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2345 | error = -EIO; |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2346 | scmd = scsi_get_command(dev, GFP_KERNEL); |
Christoph Hellwig | 0f121dd | 2014-09-05 18:00:05 -0700 | [diff] [blame] | 2347 | if (!scmd) |
Christoph Hellwig | 95eeb5f | 2014-05-01 16:51:05 +0200 | [diff] [blame] | 2348 | goto out_put_autopm_host; |
Christoph Hellwig | 95eeb5f | 2014-05-01 16:51:05 +0200 | [diff] [blame] | 2349 | |
FUJITA Tomonori | 4f54eec | 2008-04-29 09:54:37 +0200 | [diff] [blame] | 2350 | blk_rq_init(NULL, &req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | scmd->request = &req; |
Christoph Hellwig | b4edcbc | 2005-06-19 13:40:52 +0200 | [diff] [blame] | 2352 | |
Boaz Harrosh | 64a87b2 | 2008-04-30 11:19:47 +0300 | [diff] [blame] | 2353 | scmd->cmnd = req.cmd; |
| 2354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | scmd->scsi_done = scsi_reset_provider_done_command; |
Boaz Harrosh | 30b0c37 | 2007-12-13 13:47:40 +0200 | [diff] [blame] | 2356 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | |
| 2358 | scmd->cmd_len = 0; |
| 2359 | |
| 2360 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2362 | spin_lock_irqsave(shost->host_lock, flags); |
| 2363 | shost->tmf_in_progress = 1; |
| 2364 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 2365 | |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2366 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
| 2367 | case SG_SCSI_RESET_NOTHING: |
| 2368 | rtn = SUCCESS; |
| 2369 | break; |
| 2370 | case SG_SCSI_RESET_DEVICE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | rtn = scsi_try_bus_device_reset(scmd); |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2372 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | break; |
| 2374 | /* FALLTHROUGH */ |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2375 | case SG_SCSI_RESET_TARGET: |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2376 | rtn = scsi_try_target_reset(scmd); |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2377 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
Mike Christie | 30bd7df | 2008-02-29 18:25:19 -0600 | [diff] [blame] | 2378 | break; |
| 2379 | /* FALLTHROUGH */ |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2380 | case SG_SCSI_RESET_BUS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | rtn = scsi_try_bus_reset(scmd); |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2382 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | break; |
| 2384 | /* FALLTHROUGH */ |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2385 | case SG_SCSI_RESET_HOST: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2386 | rtn = scsi_try_host_reset(scmd); |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2387 | if (rtn == SUCCESS) |
| 2388 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | default: |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2390 | /* FALLTHROUGH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | rtn = FAILED; |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2392 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | } |
| 2394 | |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2395 | error = (rtn == SUCCESS) ? 0 : -EIO; |
| 2396 | |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2397 | spin_lock_irqsave(shost->host_lock, flags); |
| 2398 | shost->tmf_in_progress = 0; |
| 2399 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 2400 | |
| 2401 | /* |
| 2402 | * be sure to wake up anyone who was sleeping or had their queue |
| 2403 | * suspended while we performed the TMF. |
| 2404 | */ |
| 2405 | SCSI_LOG_ERROR_RECOVERY(3, |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 2406 | shost_printk(KERN_INFO, shost, |
| 2407 | "waking up host to restart after TMF\n")); |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2408 | |
| 2409 | wake_up(&shost->host_wait); |
James Smart | d7a1bb0 | 2006-03-08 14:50:12 -0500 | [diff] [blame] | 2410 | scsi_run_host_queues(shost); |
| 2411 | |
Christoph Hellwig | 0f121dd | 2014-09-05 18:00:05 -0700 | [diff] [blame] | 2412 | scsi_put_command(scmd); |
| 2413 | |
Christoph Hellwig | 0479633 | 2014-02-20 14:20:55 -0800 | [diff] [blame] | 2414 | out_put_autopm_host: |
Alan Stern | bc4f240 | 2010-06-17 10:41:42 -0400 | [diff] [blame] | 2415 | scsi_autopm_put_host(shost); |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2416 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2417 | } |
Christoph Hellwig | 176aa9d | 2014-10-11 12:06:47 +0200 | [diff] [blame] | 2418 | EXPORT_SYMBOL(scsi_ioctl_reset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | |
Hannes Reinecke | 4753cbc | 2014-10-24 14:26:52 +0200 | [diff] [blame] | 2420 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
| 2421 | struct scsi_sense_hdr *sshdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | { |
| 2423 | return scsi_normalize_sense(cmd->sense_buffer, |
FUJITA Tomonori | b80ca4f | 2008-01-13 15:46:13 +0900 | [diff] [blame] | 2424 | SCSI_SENSE_BUFFERSIZE, sshdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | } |
| 2426 | EXPORT_SYMBOL(scsi_command_normalize_sense); |
| 2427 | |
| 2428 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 2429 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | * @sense_buffer: byte array of sense data |
| 2431 | * @sb_len: number of valid bytes in sense_buffer |
| 2432 | * @info_out: pointer to 64 integer where 8 or 4 byte information |
| 2433 | * field will be placed if found. |
| 2434 | * |
| 2435 | * Return value: |
| 2436 | * 1 if information field found, 0 if not found. |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 2437 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
| 2439 | u64 * info_out) |
| 2440 | { |
| 2441 | int j; |
| 2442 | const u8 * ucp; |
| 2443 | u64 ull; |
| 2444 | |
| 2445 | if (sb_len < 7) |
| 2446 | return 0; |
| 2447 | switch (sense_buffer[0] & 0x7f) { |
| 2448 | case 0x70: |
| 2449 | case 0x71: |
| 2450 | if (sense_buffer[0] & 0x80) { |
| 2451 | *info_out = (sense_buffer[3] << 24) + |
| 2452 | (sense_buffer[4] << 16) + |
| 2453 | (sense_buffer[5] << 8) + sense_buffer[6]; |
| 2454 | return 1; |
| 2455 | } else |
| 2456 | return 0; |
| 2457 | case 0x72: |
| 2458 | case 0x73: |
| 2459 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, |
| 2460 | 0 /* info desc */); |
| 2461 | if (ucp && (0xa == ucp[1])) { |
| 2462 | ull = 0; |
| 2463 | for (j = 0; j < 8; ++j) { |
| 2464 | if (j > 0) |
| 2465 | ull <<= 8; |
| 2466 | ull |= ucp[4 + j]; |
| 2467 | } |
| 2468 | *info_out = ull; |
| 2469 | return 1; |
| 2470 | } else |
| 2471 | return 0; |
| 2472 | default: |
| 2473 | return 0; |
| 2474 | } |
| 2475 | } |
| 2476 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |