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drivers/scsi/scsi_error.c
58.8 KB
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/* * scsi_error.c Copyright (C) 1997 Eric Youngdale * * SCSI error/timeout handling * Initial versions: Eric Youngdale. Based upon conversations with |
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* Leonard Zubkoff and David Miller at Linux Expo, |
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* ideas originating from all over the place. * * Restructured scsi_unjam_host and associated functions. * September 04, 2002 Mike Anderson (andmike@us.ibm.com) * * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and |
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* minor cleanups. |
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* September 30, 2002 Mike Anderson (andmike@us.ibm.com) */ #include <linux/module.h> #include <linux/sched.h> |
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#include <linux/gfp.h> |
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#include <linux/timer.h> #include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/freezer.h> |
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#include <linux/kthread.h> |
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#include <linux/interrupt.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <scsi/scsi.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_dbg.h> #include <scsi/scsi_device.h> #include <scsi/scsi_eh.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_host.h> #include <scsi/scsi_ioctl.h> |
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#include "scsi_priv.h" #include "scsi_logging.h" |
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#include "scsi_transport_api.h" |
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|
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#include <trace/events/scsi.h> |
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#define SENSE_TIMEOUT (10*HZ) |
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/* * These should *probably* be handled by the host itself. * Since it is allowed to sleep, it probably should. */ #define BUS_RESET_SETTLE_TIME (10) #define HOST_RESET_SETTLE_TIME (10) |
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static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
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/* called with shost->host_lock held */ void scsi_eh_wakeup(struct Scsi_Host *shost) { if (shost->host_busy == shost->host_failed) { |
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trace_scsi_eh_wakeup(shost); |
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wake_up_process(shost->ehandler); |
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SCSI_LOG_ERROR_RECOVERY(5, printk("Waking error handler thread ")); } } |
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/** * scsi_schedule_eh - schedule EH for SCSI host * @shost: SCSI host to invoke error handling on. * * Schedule SCSI EH without scmd. |
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*/ |
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void scsi_schedule_eh(struct Scsi_Host *shost) { unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { shost->host_eh_scheduled++; scsi_eh_wakeup(shost); } spin_unlock_irqrestore(shost->host_lock, flags); } EXPORT_SYMBOL_GPL(scsi_schedule_eh); |
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/** * scsi_eh_scmd_add - add scsi cmd to error handling. * @scmd: scmd to run eh on. * @eh_flag: optional SCSI_EH flag. * * Return value: * 0 on failure. |
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*/ |
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int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) { struct Scsi_Host *shost = scmd->device->host; unsigned long flags; |
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int ret = 0; |
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|
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if (!shost->ehandler) |
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return 0; spin_lock_irqsave(shost->host_lock, flags); |
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if (scsi_host_set_state(shost, SHOST_RECOVERY)) if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) goto out_unlock; |
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|
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ret = 1; |
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scmd->eh_eflags |= eh_flag; |
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list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
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shost->host_failed++; scsi_eh_wakeup(shost); |
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out_unlock: |
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spin_unlock_irqrestore(shost->host_lock, flags); |
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return ret; |
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} /** |
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* scsi_times_out - Timeout function for normal scsi commands. |
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* @req: request that is timing out. |
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* * Notes: * We do not need to lock this. There is the potential for a race * only in that the normal completion handling might run, but if the * normal completion function determines that the timer has already * fired, then it mustn't do anything. |
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*/ |
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enum blk_eh_timer_return scsi_times_out(struct request *req) |
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{ |
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struct scsi_cmnd *scmd = req->special; |
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enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
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struct Scsi_Host *host = scmd->device->host; |
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|
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trace_scsi_dispatch_cmd_timeout(scmd); |
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scsi_log_completion(scmd, TIMEOUT_ERROR); |
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if (host->transportt->eh_timed_out) rtn = host->transportt->eh_timed_out(scmd); else if (host->hostt->eh_timed_out) rtn = host->hostt->eh_timed_out(scmd); |
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|
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if (unlikely(rtn == BLK_EH_NOT_HANDLED && !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { |
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scmd->result |= DID_TIME_OUT << 16; |
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rtn = BLK_EH_HANDLED; |
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} |
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|
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return rtn; |
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} /** * scsi_block_when_processing_errors - Prevent cmds from being queued. * @sdev: Device on which we are performing recovery. * * Description: * We block until the host is out of error recovery, and then check to * see whether the host or the device is offline. * * Return value: * 0 when dev was taken offline by error recovery. 1 OK to proceed. |
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*/ |
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int scsi_block_when_processing_errors(struct scsi_device *sdev) { int online; |
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wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
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online = scsi_device_online(sdev); |
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SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d ", __func__, |
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online)); return online; } EXPORT_SYMBOL(scsi_block_when_processing_errors); #ifdef CONFIG_SCSI_LOGGING /** * scsi_eh_prt_fail_stats - Log info on failures. * @shost: scsi host being recovered. * @work_q: Queue of scsi cmds to process. |
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*/ |
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static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, struct list_head *work_q) { struct scsi_cmnd *scmd; struct scsi_device *sdev; int total_failures = 0; int cmd_failed = 0; int cmd_cancel = 0; int devices_failed = 0; shost_for_each_device(sdev, shost) { list_for_each_entry(scmd, work_q, eh_entry) { if (scmd->device == sdev) { ++total_failures; |
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if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
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++cmd_cancel; |
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else |
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++cmd_failed; } } if (cmd_cancel || cmd_failed) { SCSI_LOG_ERROR_RECOVERY(3, |
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sdev_printk(KERN_INFO, sdev, "%s: cmds failed: %d, cancel: %d ", |
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__func__, cmd_failed, |
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cmd_cancel)); |
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cmd_cancel = 0; cmd_failed = 0; ++devices_failed; } } SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" " devices require eh work ", |
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total_failures, devices_failed)); |
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} #endif /** * scsi_check_sense - Examine scsi cmd sense * @scmd: Cmd to have sense checked. * * Return value: |
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* SUCCESS or FAILED or NEEDS_RETRY or TARGET_ERROR |
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* * Notes: * When a deferred error is detected the current command has * not been executed and needs retrying. |
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*/ |
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static int scsi_check_sense(struct scsi_cmnd *scmd) { |
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struct scsi_device *sdev = scmd->device; |
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struct scsi_sense_hdr sshdr; if (! scsi_command_normalize_sense(scmd, &sshdr)) return FAILED; /* no valid sense data */ if (scsi_sense_is_deferred(&sshdr)) return NEEDS_RETRY; |
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if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && sdev->scsi_dh_data->scsi_dh->check_sense) { int rc; rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); if (rc != SCSI_RETURN_NOT_HANDLED) return rc; /* handler does not care. Drop down to default handling */ } |
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/* * Previous logic looked for FILEMARK, EOM or ILI which are * mainly associated with tapes and returned SUCCESS. */ if (sshdr.response_code == 0x70) { /* fixed format */ if (scmd->sense_buffer[2] & 0xe0) return SUCCESS; } else { /* * descriptor format: look for "stream commands sense data * descriptor" (see SSC-3). Assume single sense data * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. */ if ((sshdr.additional_length > 3) && (scmd->sense_buffer[8] == 0x4) && (scmd->sense_buffer[11] & 0xe0)) return SUCCESS; } switch (sshdr.sense_key) { case NO_SENSE: return SUCCESS; case RECOVERED_ERROR: return /* soft_error */ SUCCESS; case ABORTED_COMMAND: |
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if (sshdr.asc == 0x10) /* DIF */ return SUCCESS; |
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return NEEDS_RETRY; case NOT_READY: case UNIT_ATTENTION: /* * if we are expecting a cc/ua because of a bus reset that we * performed, treat this just as a retry. otherwise this is * information that we should pass up to the upper-level driver * so that we can deal with it there. */ if (scmd->device->expecting_cc_ua) { |
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/* * Because some device does not queue unit * attentions correctly, we carefully check * additional sense code and qualifier so as * not to squash media change unit attention. */ if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { scmd->device->expecting_cc_ua = 0; return NEEDS_RETRY; } |
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} /* |
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* if the device is in the process of becoming ready, we |
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* should retry. */ if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) return NEEDS_RETRY; /* * if the device is not started, we need to wake * the error handler to start the motor */ if (scmd->device->allow_restart && (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) return FAILED; |
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|
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if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) scmd_printk(KERN_WARNING, scmd, "Warning! Received an indication that the " "LUN assignments on this target have " "changed. The Linux SCSI layer does not " "automatically remap LUN assignments. "); else if (sshdr.asc == 0x3f) scmd_printk(KERN_WARNING, scmd, "Warning! Received an indication that the " "operating parameters on this target have " "changed. The Linux SCSI layer does not " "automatically adjust these parameters. "); |
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if (sshdr.asc == 0x38 && sshdr.ascq == 0x07) scmd_printk(KERN_WARNING, scmd, "Warning! Received an indication that the " "LUN reached a thin provisioning soft " "threshold. "); |
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/* * Pass the UA upwards for a determination in the completion * functions. */ return SUCCESS; |
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|
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/* these are not supported */ |
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case COPY_ABORTED: case VOLUME_OVERFLOW: case MISCOMPARE: |
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case BLANK_CHECK: case DATA_PROTECT: return TARGET_ERROR; |
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case MEDIUM_ERROR: |
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if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ sshdr.asc == 0x13 || /* AMNF DATA FIELD */ sshdr.asc == 0x14) { /* RECORD NOT FOUND */ |
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return TARGET_ERROR; |
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} |
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return NEEDS_RETRY; case HARDWARE_ERROR: if (scmd->device->retry_hwerror) |
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return ADD_TO_MLQUEUE; |
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else |
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return TARGET_ERROR; |
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case ILLEGAL_REQUEST: |
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default: return SUCCESS; } } |
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static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) { struct scsi_host_template *sht = sdev->host->hostt; struct scsi_device *tmp_sdev; if (!sht->change_queue_depth || sdev->queue_depth >= sdev->max_queue_depth) return; if (time_before(jiffies, sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) return; if (time_before(jiffies, sdev->last_queue_full_time + sdev->queue_ramp_up_period)) return; /* * Walk all devices of a target and do * ramp up on them. */ shost_for_each_device(tmp_sdev, sdev->host) { if (tmp_sdev->channel != sdev->channel || tmp_sdev->id != sdev->id || tmp_sdev->queue_depth == sdev->max_queue_depth) continue; /* * call back into LLD to increase queue_depth by one * with ramp up reason code. */ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, SCSI_QDEPTH_RAMP_UP); sdev->last_queue_ramp_up = jiffies; } } |
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static void scsi_handle_queue_full(struct scsi_device *sdev) { struct scsi_host_template *sht = sdev->host->hostt; struct scsi_device *tmp_sdev; if (!sht->change_queue_depth) return; shost_for_each_device(tmp_sdev, sdev->host) { if (tmp_sdev->channel != sdev->channel || tmp_sdev->id != sdev->id) continue; /* * We do not know the number of commands that were at * the device when we got the queue full so we start * from the highest possible value and work our way down. */ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, SCSI_QDEPTH_QFULL); } } |
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/** * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. * @scmd: SCSI cmd to examine. * * Notes: * This is *only* called when we are examining the status of commands * queued during error recovery. the main difference here is that we * don't allow for the possibility of retries here, and we are a lot * more restrictive about what we consider acceptable. |
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*/ |
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static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) { /* * first check the host byte, to see if there is anything in there * that would indicate what we need to do. */ if (host_byte(scmd->result) == DID_RESET) { /* * rats. we are already in the error handler, so we now * get to try and figure out what to do next. if the sense * is valid, we have a pretty good idea of what to do. * if not, we mark it as FAILED. */ return scsi_check_sense(scmd); } if (host_byte(scmd->result) != DID_OK) return FAILED; /* * next, check the message byte. */ if (msg_byte(scmd->result) != COMMAND_COMPLETE) return FAILED; /* * now, check the status byte to see if this indicates * anything special. */ switch (status_byte(scmd->result)) { case GOOD: |
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scsi_handle_queue_ramp_up(scmd->device); |
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case COMMAND_TERMINATED: return SUCCESS; case CHECK_CONDITION: return scsi_check_sense(scmd); case CONDITION_GOOD: case INTERMEDIATE_GOOD: case INTERMEDIATE_C_GOOD: /* * who knows? FIXME(eric) */ return SUCCESS; |
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case RESERVATION_CONFLICT: |
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if (scmd->cmnd[0] == TEST_UNIT_READY) /* it is a success, we probed the device and * found it */ return SUCCESS; /* otherwise, we failed to send the command */ return FAILED; |
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case QUEUE_FULL: |
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scsi_handle_queue_full(scmd->device); /* fall through */ case BUSY: |
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return NEEDS_RETRY; |
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default: return FAILED; } return FAILED; } /** |
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* scsi_eh_done - Completion function for error handling. * @scmd: Cmd that is done. |
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*/ |
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static void scsi_eh_done(struct scsi_cmnd *scmd) { |
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struct completion *eh_action; |
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|
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SCSI_LOG_ERROR_RECOVERY(3, printk("%s scmd: %p result: %x ", |
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__func__, scmd, scmd->result)); |
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eh_action = scmd->device->host->eh_action; if (eh_action) complete(eh_action); |
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} /** |
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* scsi_try_host_reset - ask host adapter to reset itself * @scmd: SCSI cmd to send hsot reset. |
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*/ |
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static int scsi_try_host_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
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struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
292148f8b [SCSI] scsi_error... |
523 524 525 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST ", |
cadbd4a5e [SCSI] replace __... |
526 |
__func__)); |
292148f8b [SCSI] scsi_error... |
527 |
|
0bf8c8697 Reduce sequential... |
528 |
if (!hostt->eh_host_reset_handler) |
292148f8b [SCSI] scsi_error... |
529 |
return FAILED; |
0bf8c8697 Reduce sequential... |
530 |
rtn = hostt->eh_host_reset_handler(scmd); |
292148f8b [SCSI] scsi_error... |
531 532 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
533 |
if (!hostt->skip_settle_delay) |
292148f8b [SCSI] scsi_error... |
534 |
ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c8697 Reduce sequential... |
535 536 537 |
spin_lock_irqsave(host->host_lock, flags); scsi_report_bus_reset(host, scmd_channel(scmd)); spin_unlock_irqrestore(host->host_lock, flags); |
292148f8b [SCSI] scsi_error... |
538 539 540 541 542 543 544 545 |
} return rtn; } /** * scsi_try_bus_reset - ask host to perform a bus reset * @scmd: SCSI cmd to send bus reset. |
dc8875e10 [SCSI] docbook an... |
546 |
*/ |
292148f8b [SCSI] scsi_error... |
547 548 549 550 |
static int scsi_try_bus_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
0bf8c8697 Reduce sequential... |
551 552 |
struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
292148f8b [SCSI] scsi_error... |
553 554 555 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST ", |
cadbd4a5e [SCSI] replace __... |
556 |
__func__)); |
292148f8b [SCSI] scsi_error... |
557 |
|
0bf8c8697 Reduce sequential... |
558 |
if (!hostt->eh_bus_reset_handler) |
292148f8b [SCSI] scsi_error... |
559 |
return FAILED; |
0bf8c8697 Reduce sequential... |
560 |
rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8b [SCSI] scsi_error... |
561 562 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
563 |
if (!hostt->skip_settle_delay) |
292148f8b [SCSI] scsi_error... |
564 |
ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c8697 Reduce sequential... |
565 566 567 |
spin_lock_irqsave(host->host_lock, flags); scsi_report_bus_reset(host, scmd_channel(scmd)); spin_unlock_irqrestore(host->host_lock, flags); |
292148f8b [SCSI] scsi_error... |
568 569 570 571 |
} return rtn; } |
30bd7df8c [SCSI] scsi_error... |
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 |
static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) { sdev->was_reset = 1; sdev->expecting_cc_ua = 1; } /** * scsi_try_target_reset - Ask host to perform a target reset * @scmd: SCSI cmd used to send a target reset * * Notes: * There is no timeout for this operation. if this operation is * unreliable for a given host, then the host itself needs to put a * timer on it, and set the host back to a consistent state prior to * returning. */ static int scsi_try_target_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
0bf8c8697 Reduce sequential... |
592 593 |
struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
30bd7df8c [SCSI] scsi_error... |
594 |
|
0bf8c8697 Reduce sequential... |
595 |
if (!hostt->eh_target_reset_handler) |
30bd7df8c [SCSI] scsi_error... |
596 |
return FAILED; |
0bf8c8697 Reduce sequential... |
597 |
rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8c [SCSI] scsi_error... |
598 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
599 |
spin_lock_irqsave(host->host_lock, flags); |
30bd7df8c [SCSI] scsi_error... |
600 601 |
__starget_for_each_device(scsi_target(scmd->device), NULL, __scsi_report_device_reset); |
0bf8c8697 Reduce sequential... |
602 |
spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8c [SCSI] scsi_error... |
603 604 605 606 |
} return rtn; } |
292148f8b [SCSI] scsi_error... |
607 608 609 610 611 612 613 614 615 |
/** * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev * @scmd: SCSI cmd used to send BDR * * Notes: * There is no timeout for this operation. if this operation is * unreliable for a given host, then the host itself needs to put a * timer on it, and set the host back to a consistent state prior to * returning. |
dc8875e10 [SCSI] docbook an... |
616 |
*/ |
292148f8b [SCSI] scsi_error... |
617 618 619 |
static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) { int rtn; |
0bf8c8697 Reduce sequential... |
620 |
struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8b [SCSI] scsi_error... |
621 |
|
0bf8c8697 Reduce sequential... |
622 |
if (!hostt->eh_device_reset_handler) |
292148f8b [SCSI] scsi_error... |
623 |
return FAILED; |
0bf8c8697 Reduce sequential... |
624 |
rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8c [SCSI] scsi_error... |
625 626 |
if (rtn == SUCCESS) __scsi_report_device_reset(scmd->device, NULL); |
292148f8b [SCSI] scsi_error... |
627 628 |
return rtn; } |
0bf8c8697 Reduce sequential... |
629 |
static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8b [SCSI] scsi_error... |
630 |
{ |
0bf8c8697 Reduce sequential... |
631 |
if (!hostt->eh_abort_handler) |
292148f8b [SCSI] scsi_error... |
632 |
return FAILED; |
0bf8c8697 Reduce sequential... |
633 |
return hostt->eh_abort_handler(scmd); |
292148f8b [SCSI] scsi_error... |
634 |
} |
292148f8b [SCSI] scsi_error... |
635 636 |
static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) { |
0bf8c8697 Reduce sequential... |
637 |
if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8b [SCSI] scsi_error... |
638 |
if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8c [SCSI] scsi_error... |
639 640 641 |
if (scsi_try_target_reset(scmd) != SUCCESS) if (scsi_try_bus_reset(scmd) != SUCCESS) scsi_try_host_reset(scmd); |
292148f8b [SCSI] scsi_error... |
642 643 644 |
} /** |
e1c234685 [SCSI] scsi_error... |
645 |
* scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de5 [SCSI] use one-el... |
646 |
* @scmd: SCSI command structure to hijack |
e1c234685 [SCSI] scsi_error... |
647 |
* @ses: structure to save restore information |
55db6c1b8 [SCSI] scsi_error... |
648 |
* @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b244 [SCSI] Let scsi_c... |
649 |
* @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b8 [SCSI] scsi_error... |
650 |
* @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de5 [SCSI] use one-el... |
651 |
* |
e1c234685 [SCSI] scsi_error... |
652 |
* This function is used to save a scsi command information before re-execution |
55db6c1b8 [SCSI] scsi_error... |
653 654 655 656 |
* as part of the error recovery process. If @sense_bytes is 0 the command * sent must be one that does not transfer any data. If @sense_bytes != 0 * @cmnd is ignored and this functions sets up a REQUEST_SENSE command * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. |
dc8875e10 [SCSI] docbook an... |
657 |
*/ |
e1c234685 [SCSI] scsi_error... |
658 659 |
void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) |
1da177e4c Linux-2.6.12-rc2 |
660 |
{ |
f59114b7b [PATCH] scsi: scs... |
661 |
struct scsi_device *sdev = scmd->device; |
1da177e4c Linux-2.6.12-rc2 |
662 |
|
631c228cd [SCSI] hide EH ba... |
663 664 665 666 667 668 669 |
/* * We need saved copies of a number of fields - this is because * error handling may need to overwrite these with different values * to run different commands, and once error handling is complete, * we will need to restore these values prior to running the actual * command. */ |
e1c234685 [SCSI] scsi_error... |
670 |
ses->cmd_len = scmd->cmd_len; |
64a87b244 [SCSI] Let scsi_c... |
671 |
ses->cmnd = scmd->cmnd; |
e1c234685 [SCSI] scsi_error... |
672 |
ses->data_direction = scmd->sc_data_direction; |
30b0c37b2 [SCSI] implement ... |
673 |
ses->sdb = scmd->sdb; |
6f9a35e2d [SCSI] bidirectio... |
674 |
ses->next_rq = scmd->request->next_rq; |
e1c234685 [SCSI] scsi_error... |
675 |
ses->result = scmd->result; |
12265709a [SCSI] scsi_eh_pr... |
676 |
ses->underflow = scmd->underflow; |
db007fc5e [SCSI] Command pr... |
677 |
ses->prot_op = scmd->prot_op; |
631c228cd [SCSI] hide EH ba... |
678 |
|
db007fc5e [SCSI] Command pr... |
679 |
scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b244 [SCSI] Let scsi_c... |
680 681 |
scmd->cmnd = ses->eh_cmnd; memset(scmd->cmnd, 0, BLK_MAX_CDB); |
30b0c37b2 [SCSI] implement ... |
682 |
memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2d [SCSI] bidirectio... |
683 |
scmd->request->next_rq = NULL; |
30b0c37b2 [SCSI] implement ... |
684 |
|
55db6c1b8 [SCSI] scsi_error... |
685 |
if (sense_bytes) { |
30b0c37b2 [SCSI] implement ... |
686 687 |
scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, sense_bytes); |
e1c234685 [SCSI] scsi_error... |
688 |
sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b2 [SCSI] implement ... |
689 690 |
scmd->sdb.length); scmd->sdb.table.sgl = &ses->sense_sgl; |
55db6c1b8 [SCSI] scsi_error... |
691 |
scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b2 [SCSI] implement ... |
692 |
scmd->sdb.table.nents = 1; |
55db6c1b8 [SCSI] scsi_error... |
693 |
scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b2 [SCSI] implement ... |
694 |
scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b8 [SCSI] scsi_error... |
695 |
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228cd [SCSI] hide EH ba... |
696 |
} else { |
631c228cd [SCSI] hide EH ba... |
697 |
scmd->sc_data_direction = DMA_NONE; |
55db6c1b8 [SCSI] scsi_error... |
698 |
if (cmnd) { |
64a87b244 [SCSI] Let scsi_c... |
699 |
BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b8 [SCSI] scsi_error... |
700 701 702 |
memcpy(scmd->cmnd, cmnd, cmnd_size); scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); } |
631c228cd [SCSI] hide EH ba... |
703 704 705 |
} scmd->underflow = 0; |
631c228cd [SCSI] hide EH ba... |
706 |
|
55db6c1b8 [SCSI] scsi_error... |
707 |
if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4c Linux-2.6.12-rc2 |
708 |
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7b [PATCH] scsi: scs... |
709 |
(sdev->lun << 5 & 0xe0); |
1da177e4c Linux-2.6.12-rc2 |
710 |
|
631c228cd [SCSI] hide EH ba... |
711 712 713 714 |
/* * Zero the sense buffer. The scsi spec mandates that any * untransferred sense data should be interpreted as being zero. */ |
b80ca4f7e [SCSI] replace si... |
715 |
memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c234685 [SCSI] scsi_error... |
716 717 718 719 720 721 |
} EXPORT_SYMBOL(scsi_eh_prep_cmnd); /** * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory * @scmd: SCSI command structure to restore |
477e608c0 [SCSI] fix docume... |
722 |
* @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c234685 [SCSI] scsi_error... |
723 |
* |
477e608c0 [SCSI] fix docume... |
724 |
* Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e10 [SCSI] docbook an... |
725 |
*/ |
e1c234685 [SCSI] scsi_error... |
726 727 728 729 730 731 |
void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) { /* * Restore original data */ scmd->cmd_len = ses->cmd_len; |
64a87b244 [SCSI] Let scsi_c... |
732 |
scmd->cmnd = ses->cmnd; |
e1c234685 [SCSI] scsi_error... |
733 |
scmd->sc_data_direction = ses->data_direction; |
30b0c37b2 [SCSI] implement ... |
734 |
scmd->sdb = ses->sdb; |
6f9a35e2d [SCSI] bidirectio... |
735 |
scmd->request->next_rq = ses->next_rq; |
e1c234685 [SCSI] scsi_error... |
736 |
scmd->result = ses->result; |
12265709a [SCSI] scsi_eh_pr... |
737 |
scmd->underflow = ses->underflow; |
db007fc5e [SCSI] Command pr... |
738 |
scmd->prot_op = ses->prot_op; |
e1c234685 [SCSI] scsi_error... |
739 740 |
} EXPORT_SYMBOL(scsi_eh_restore_cmnd); |
631c228cd [SCSI] hide EH ba... |
741 |
|
e1c234685 [SCSI] scsi_error... |
742 743 744 745 746 747 748 749 750 751 752 753 754 |
/** * scsi_send_eh_cmnd - submit a scsi command as part of error recory * @scmd: SCSI command structure to hijack * @cmnd: CDB to send * @cmnd_size: size in bytes of @cmnd * @timeout: timeout for this request * @sense_bytes: size of sense data to copy or 0 * * This function is used to send a scsi command down to a target device * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. * * Return value: * SUCCESS or FAILED or NEEDS_RETRY |
dc8875e10 [SCSI] docbook an... |
755 |
*/ |
e1c234685 [SCSI] scsi_error... |
756 757 758 759 760 761 762 |
static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, int cmnd_size, int timeout, unsigned sense_bytes) { struct scsi_device *sdev = scmd->device; struct Scsi_Host *shost = sdev->host; DECLARE_COMPLETION_ONSTACK(done); unsigned long timeleft; |
e1c234685 [SCSI] scsi_error... |
763 764 765 766 |
struct scsi_eh_save ses; int rtn; scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a52 [SCSI] use a comp... |
767 |
shost->eh_action = &done; |
1da177e4c Linux-2.6.12-rc2 |
768 |
|
1da177e4c Linux-2.6.12-rc2 |
769 |
scsi_log_send(scmd); |
f281233d3 SCSI host lock pu... |
770 771 |
scmd->scsi_done = scsi_eh_done; shost->hostt->queuecommand(shost, scmd); |
1da177e4c Linux-2.6.12-rc2 |
772 |
|
7dfdc9a52 [SCSI] use a comp... |
773 |
timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4c Linux-2.6.12-rc2 |
774 |
|
f59114b7b [PATCH] scsi: scs... |
775 |
shost->eh_action = NULL; |
1da177e4c Linux-2.6.12-rc2 |
776 |
|
7dfdc9a52 [SCSI] use a comp... |
777 |
scsi_log_completion(scmd, SUCCESS); |
1da177e4c Linux-2.6.12-rc2 |
778 |
|
7dfdc9a52 [SCSI] use a comp... |
779 780 781 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd: %p, timeleft: %ld ", |
cadbd4a5e [SCSI] replace __... |
782 |
__func__, scmd, timeleft)); |
1da177e4c Linux-2.6.12-rc2 |
783 784 |
/* |
7dfdc9a52 [SCSI] use a comp... |
785 786 787 788 |
* If there is time left scsi_eh_done got called, and we will * examine the actual status codes to see whether the command * actually did complete normally, else tell the host to forget * about this command. |
1da177e4c Linux-2.6.12-rc2 |
789 |
*/ |
7dfdc9a52 [SCSI] use a comp... |
790 |
if (timeleft) { |
1da177e4c Linux-2.6.12-rc2 |
791 792 793 794 |
rtn = scsi_eh_completed_normally(scmd); SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scsi_eh_completed_normally %x ", |
cadbd4a5e [SCSI] replace __... |
795 |
__func__, rtn)); |
7dfdc9a52 [SCSI] use a comp... |
796 |
|
1da177e4c Linux-2.6.12-rc2 |
797 798 799 800 |
switch (rtn) { case SUCCESS: case NEEDS_RETRY: case FAILED: |
63583cca7 [SCSI] Add detail... |
801 |
case TARGET_ERROR: |
1da177e4c Linux-2.6.12-rc2 |
802 |
break; |
6e883b0e4 [SCSI] Retry ADD_... |
803 804 805 |
case ADD_TO_MLQUEUE: rtn = NEEDS_RETRY; break; |
1da177e4c Linux-2.6.12-rc2 |
806 807 808 809 |
default: rtn = FAILED; break; } |
7dfdc9a52 [SCSI] use a comp... |
810 |
} else { |
292148f8b [SCSI] scsi_error... |
811 |
scsi_abort_eh_cmnd(scmd); |
7dfdc9a52 [SCSI] use a comp... |
812 |
rtn = FAILED; |
1da177e4c Linux-2.6.12-rc2 |
813 |
} |
e1c234685 [SCSI] scsi_error... |
814 |
scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4c Linux-2.6.12-rc2 |
815 816 817 818 819 820 821 822 823 824 825 |
return rtn; } /** * scsi_request_sense - Request sense data from a particular target. * @scmd: SCSI cmd for request sense. * * Notes: * Some hosts automatically obtain this information, others require * that we obtain it on our own. This function will *not* return until * the command either times out, or it completes. |
dc8875e10 [SCSI] docbook an... |
826 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
827 828 |
static int scsi_request_sense(struct scsi_cmnd *scmd) { |
55db6c1b8 [SCSI] scsi_error... |
829 |
return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 834 835 836 837 838 839 |
} /** * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. * @scmd: Original SCSI cmd that eh has finished. * @done_q: Queue for processed commands. * * Notes: * We don't want to use the normal command completion while we are are * still handling errors - it may cause other commands to be queued, |
eb44820c2 [SCSI] Add Docume... |
840 |
* and that would disturb what we are doing. Thus we really want to |
1da177e4c Linux-2.6.12-rc2 |
841 842 |
* keep a list of pending commands for final completion, and once we * are ready to leave error handling we handle completion for real. |
dc8875e10 [SCSI] docbook an... |
843 |
*/ |
041c5fc33 [PATCH] SCSI: exp... |
844 |
void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
845 846 |
{ scmd->device->host->host_failed--; |
3111b0d16 [SCSI] remove scs... |
847 |
scmd->eh_eflags = 0; |
1da177e4c Linux-2.6.12-rc2 |
848 849 |
list_move_tail(&scmd->eh_entry, done_q); } |
041c5fc33 [PATCH] SCSI: exp... |
850 |
EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 854 |
/** * scsi_eh_get_sense - Get device sense data. * @work_q: Queue of commands to process. |
eb44820c2 [SCSI] Add Docume... |
855 |
* @done_q: Queue of processed commands. |
1da177e4c Linux-2.6.12-rc2 |
856 857 858 |
* * Description: * See if we need to request sense information. if so, then get it |
0bf8c8697 Reduce sequential... |
859 |
* now, so we have a better idea of what to do. |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 |
* * Notes: * This has the unfortunate side effect that if a shost adapter does |
eb44820c2 [SCSI] Add Docume... |
863 |
* not automatically request sense information, we end up shutting |
1da177e4c Linux-2.6.12-rc2 |
864 865 866 867 868 869 870 |
* it down before we request it. * * All drivers should request sense information internally these days, * so for now all I have to say is tough noogies if you end up in here. * * XXX: Long term this code should go away, but that needs an audit of * all LLDDs first. |
dc8875e10 [SCSI] docbook an... |
871 |
*/ |
dca84e469 [SCSI] scsi_error... |
872 873 |
int scsi_eh_get_sense(struct list_head *work_q, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
874 |
{ |
937abeaad [SCSI] use list_f... |
875 |
struct scsi_cmnd *scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
876 |
int rtn; |
937abeaad [SCSI] use list_f... |
877 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d16 [SCSI] remove scs... |
878 |
if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4c Linux-2.6.12-rc2 |
879 880 |
SCSI_SENSE_VALID(scmd)) continue; |
3bf743e7c [SCSI] use {sdev,... |
881 882 883 884 |
SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, "%s: requesting sense ", current->comm)); |
1da177e4c Linux-2.6.12-rc2 |
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 |
rtn = scsi_request_sense(scmd); if (rtn != SUCCESS) continue; SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" " result %x ", scmd, scmd->result)); SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); rtn = scsi_decide_disposition(scmd); /* * if the result was normal, then just pass it along to the * upper level. */ if (rtn == SUCCESS) /* we don't want this command reissued, just * finished with the sense data, so set * retries to the max allowed to ensure it * won't get reissued */ scmd->retries = scmd->allowed; else if (rtn != NEEDS_RETRY) continue; scsi_eh_finish_cmd(scmd, done_q); } return list_empty(work_q); } |
dca84e469 [SCSI] scsi_error... |
915 |
EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4c Linux-2.6.12-rc2 |
916 917 |
/** |
1da177e4c Linux-2.6.12-rc2 |
918 |
* scsi_eh_tur - Send TUR to device. |
eb44820c2 [SCSI] Add Docume... |
919 |
* @scmd: &scsi_cmnd to send TUR |
1da177e4c Linux-2.6.12-rc2 |
920 921 922 |
* * Return value: * 0 - Device is ready. 1 - Device NOT ready. |
dc8875e10 [SCSI] docbook an... |
923 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
924 925 926 927 928 929 |
static int scsi_eh_tur(struct scsi_cmnd *scmd) { static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; int retry_cnt = 1, rtn; retry_tur: |
0db99e335 [SCSI] fix scsi_s... |
930 |
rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4c Linux-2.6.12-rc2 |
931 |
|
1da177e4c Linux-2.6.12-rc2 |
932 933 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x ", |
cadbd4a5e [SCSI] replace __... |
934 |
__func__, scmd, rtn)); |
631c228cd [SCSI] hide EH ba... |
935 936 937 |
switch (rtn) { case NEEDS_RETRY: |
1da177e4c Linux-2.6.12-rc2 |
938 939 |
if (retry_cnt--) goto retry_tur; |
631c228cd [SCSI] hide EH ba... |
940 941 |
/*FALLTHRU*/ case SUCCESS: |
e47373ec1 [SCSI] return suc... |
942 |
return 0; |
631c228cd [SCSI] hide EH ba... |
943 944 |
default: return 1; |
e47373ec1 [SCSI] return suc... |
945 |
} |
1da177e4c Linux-2.6.12-rc2 |
946 947 948 |
} /** |
3eef6257d [SCSI] Reduce err... |
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 |
* scsi_eh_test_devices - check if devices are responding from error recovery. * @cmd_list: scsi commands in error recovery. * @work_q: queue for commands which still need more error recovery * @done_q: queue for commands which are finished * @try_stu: boolean on if a STU command should be tried in addition to TUR. * * Decription: * Tests if devices are in a working state. Commands to devices now in * a working state are sent to the done_q while commands to devices which * are still failing to respond are returned to the work_q for more * processing. **/ static int scsi_eh_test_devices(struct list_head *cmd_list, struct list_head *work_q, struct list_head *done_q, int try_stu) { struct scsi_cmnd *scmd, *next; struct scsi_device *sdev; int finish_cmds; while (!list_empty(cmd_list)) { scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); sdev = scmd->device; finish_cmds = !scsi_device_online(scmd->device) || (try_stu && !scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || !scsi_eh_tur(scmd); list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) if (scmd->device == sdev) { if (finish_cmds) scsi_eh_finish_cmd(scmd, done_q); else list_move_tail(&scmd->eh_entry, work_q); } } return list_empty(work_q); } /** |
eb44820c2 [SCSI] Add Docume... |
991 992 993 |
* scsi_eh_abort_cmds - abort pending commands. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
994 995 996 |
* * Decription: * Try and see whether or not it makes sense to try and abort the |
eb44820c2 [SCSI] Add Docume... |
997 998 |
* running command. This only works out to be the case if we have one * command that has timed out. If the command simply failed, it makes |
1da177e4c Linux-2.6.12-rc2 |
999 1000 |
* no sense to try and abort the command, since as far as the shost * adapter is concerned, it isn't running. |
dc8875e10 [SCSI] docbook an... |
1001 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 |
static int scsi_eh_abort_cmds(struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1005 |
struct scsi_cmnd *scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1006 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1007 |
int rtn; |
937abeaad [SCSI] use list_f... |
1008 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d16 [SCSI] remove scs... |
1009 |
if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4c Linux-2.6.12-rc2 |
1010 1011 1012 1013 1014 |
continue; SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" "0x%p ", current->comm, scmd)); |
0bf8c8697 Reduce sequential... |
1015 |
rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb5876 [SCSI] Allow FC ... |
1016 |
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d16 [SCSI] remove scs... |
1017 |
scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257d [SCSI] Reduce err... |
1018 |
if (rtn == FAST_IO_FAIL) |
1da177e4c Linux-2.6.12-rc2 |
1019 |
scsi_eh_finish_cmd(scmd, done_q); |
3eef6257d [SCSI] Reduce err... |
1020 1021 |
else list_move_tail(&scmd->eh_entry, &check_list); |
1da177e4c Linux-2.6.12-rc2 |
1022 1023 1024 1025 1026 1027 1028 1029 |
} else SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" " cmd failed:" "0x%p ", current->comm, scmd)); } |
3eef6257d [SCSI] Reduce err... |
1030 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 |
} /** |
1da177e4c Linux-2.6.12-rc2 |
1034 |
* scsi_eh_try_stu - Send START_UNIT to device. |
eb44820c2 [SCSI] Add Docume... |
1035 |
* @scmd: &scsi_cmnd to send START_UNIT |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 |
* * Return value: * 0 - Device is ready. 1 - Device NOT ready. |
dc8875e10 [SCSI] docbook an... |
1039 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 |
static int scsi_eh_try_stu(struct scsi_cmnd *scmd) { static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; |
1da177e4c Linux-2.6.12-rc2 |
1043 |
|
631c228cd [SCSI] hide EH ba... |
1044 |
if (scmd->device->allow_restart) { |
ed773e664 [SCSI] scsi_error... |
1045 1046 1047 |
int i, rtn = NEEDS_RETRY; for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) |
9728c0814 [SCSI] make scsi_... |
1048 |
rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4c Linux-2.6.12-rc2 |
1049 |
|
631c228cd [SCSI] hide EH ba... |
1050 1051 1052 |
if (rtn == SUCCESS) return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1053 |
|
1da177e4c Linux-2.6.12-rc2 |
1054 1055 1056 1057 1058 |
return 1; } /** * scsi_eh_stu - send START_UNIT if needed |
eb44820c2 [SCSI] Add Docume... |
1059 1060 1061 |
* @shost: &scsi host being recovered. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 1064 |
* * Notes: * If commands are failing due to not ready, initializing command required, |
0bf8c8697 Reduce sequential... |
1065 |
* try revalidating the device, which will end up sending a start unit. |
dc8875e10 [SCSI] docbook an... |
1066 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 1069 1070 |
static int scsi_eh_stu(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1071 |
struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 |
struct scsi_device *sdev; shost_for_each_device(sdev, shost) { stu_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && scsi_check_sense(scmd) == FAILED ) { stu_scmd = scmd; break; } if (!stu_scmd) continue; SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" " 0x%p ", current->comm, sdev)); if (!scsi_eh_try_stu(stu_scmd)) { if (!scsi_device_online(sdev) || !scsi_eh_tur(stu_scmd)) { |
937abeaad [SCSI] use list_f... |
1093 1094 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
if (scmd->device == sdev) scsi_eh_finish_cmd(scmd, done_q); } } } else { SCSI_LOG_ERROR_RECOVERY(3, printk("%s: START_UNIT failed to sdev:" " 0x%p ", current->comm, sdev)); } } return list_empty(work_q); } /** * scsi_eh_bus_device_reset - send bdr if needed * @shost: scsi host being recovered. |
eb44820c2 [SCSI] Add Docume... |
1114 1115 |
* @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1116 1117 |
* * Notes: |
eb44820c2 [SCSI] Add Docume... |
1118 |
* Try a bus device reset. Still, look to see whether we have multiple |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 |
* devices that are jammed or not - if we have multiple devices, it * makes no sense to try bus_device_reset - we really would need to try |
0bf8c8697 Reduce sequential... |
1121 |
* a bus_reset instead. |
dc8875e10 [SCSI] docbook an... |
1122 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1123 1124 1125 1126 |
static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1127 |
struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 |
struct scsi_device *sdev; int rtn; shost_for_each_device(sdev, shost) { bdr_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev) { bdr_scmd = scmd; break; } if (!bdr_scmd) continue; SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" " 0x%p ", current->comm, sdev)); rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb5876 [SCSI] Allow FC ... |
1147 |
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4c Linux-2.6.12-rc2 |
1148 |
if (!scsi_device_online(sdev) || |
2f2eb5876 [SCSI] Allow FC ... |
1149 |
rtn == FAST_IO_FAIL || |
1da177e4c Linux-2.6.12-rc2 |
1150 |
!scsi_eh_tur(bdr_scmd)) { |
937abeaad [SCSI] use list_f... |
1151 1152 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4c Linux-2.6.12-rc2 |
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 |
if (scmd->device == sdev) scsi_eh_finish_cmd(scmd, done_q); } } } else { SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" " failed sdev:" "0x%p ", current->comm, sdev)); } } return list_empty(work_q); } /** |
30bd7df8c [SCSI] scsi_error... |
1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 |
* scsi_eh_target_reset - send target reset if needed * @shost: scsi host being recovered. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. * * Notes: * Try a target reset. */ static int scsi_eh_target_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
98db51957 [SCSI] fix id com... |
1184 |
LIST_HEAD(tmp_list); |
3eef6257d [SCSI] Reduce err... |
1185 |
LIST_HEAD(check_list); |
30bd7df8c [SCSI] scsi_error... |
1186 |
|
98db51957 [SCSI] fix id com... |
1187 1188 1189 1190 1191 1192 1193 1194 1195 |
list_splice_init(work_q, &tmp_list); while (!list_empty(&tmp_list)) { struct scsi_cmnd *next, *scmd; int rtn; unsigned int id; scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); id = scmd_id(scmd); |
30bd7df8c [SCSI] scsi_error... |
1196 1197 1198 1199 1200 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " "to target %d ", current->comm, id)); |
98db51957 [SCSI] fix id com... |
1201 1202 |
rtn = scsi_try_target_reset(scmd); if (rtn != SUCCESS && rtn != FAST_IO_FAIL) |
30bd7df8c [SCSI] scsi_error... |
1203 1204 1205 1206 1207 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" " failed target: " "%d ", current->comm, id)); |
98db51957 [SCSI] fix id com... |
1208 1209 1210 |
list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { if (scmd_id(scmd) != id) continue; |
3eef6257d [SCSI] Reduce err... |
1211 1212 1213 |
if (rtn == SUCCESS) list_move_tail(&scmd->eh_entry, &check_list); else if (rtn == FAST_IO_FAIL) |
98db51957 [SCSI] fix id com... |
1214 1215 1216 1217 1218 1219 |
scsi_eh_finish_cmd(scmd, done_q); else /* push back on work queue for further processing */ list_move(&scmd->eh_entry, work_q); } } |
30bd7df8c [SCSI] scsi_error... |
1220 |
|
3eef6257d [SCSI] Reduce err... |
1221 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8c [SCSI] scsi_error... |
1222 1223 1224 |
} /** |
0bf8c8697 Reduce sequential... |
1225 |
* scsi_eh_bus_reset - send a bus reset |
eb44820c2 [SCSI] Add Docume... |
1226 1227 1228 |
* @shost: &scsi host being recovered. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1229 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 |
static int scsi_eh_bus_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1234 |
struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1235 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 1242 |
unsigned int channel; int rtn; /* * we really want to loop over the various channels, and do this on * a channel by channel basis. we should also check to see if any * of the failed commands are on soft_reset devices, and if so, skip |
0bf8c8697 Reduce sequential... |
1243 |
* the reset. |
1da177e4c Linux-2.6.12-rc2 |
1244 1245 1246 1247 1248 |
*/ for (channel = 0; channel <= shost->max_channel; channel++) { chan_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) { |
422c0d61d [SCSI] use scmd_i... |
1249 |
if (channel == scmd_channel(scmd)) { |
1da177e4c Linux-2.6.12-rc2 |
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 |
chan_scmd = scmd; break; /* * FIXME add back in some support for * soft_reset devices. */ } } if (!chan_scmd) continue; SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" " %d ", current->comm, channel)); rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb5876 [SCSI] Allow FC ... |
1266 |
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaad [SCSI] use list_f... |
1267 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257d [SCSI] Reduce err... |
1268 1269 |
if (channel == scmd_channel(scmd)) { if (rtn == FAST_IO_FAIL) |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 |
scsi_eh_finish_cmd(scmd, done_q); |
3eef6257d [SCSI] Reduce err... |
1272 1273 1274 1275 |
else list_move_tail(&scmd->eh_entry, &check_list); } |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 1278 1279 1280 1281 1282 1283 1284 |
} } else { SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" " failed chan: %d ", current->comm, channel)); } } |
3eef6257d [SCSI] Reduce err... |
1285 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 1288 |
} /** |
0bf8c8697 Reduce sequential... |
1289 |
* scsi_eh_host_reset - send a host reset |
1da177e4c Linux-2.6.12-rc2 |
1290 1291 |
* @work_q: list_head for processed commands. * @done_q: list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1292 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1293 1294 1295 |
static int scsi_eh_host_reset(struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1296 |
struct scsi_cmnd *scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1297 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1298 |
int rtn; |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 |
if (!list_empty(work_q)) { scmd = list_entry(work_q->next, struct scsi_cmnd, eh_entry); SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST " , current->comm)); rtn = scsi_try_host_reset(scmd); |
3eef6257d [SCSI] Reduce err... |
1309 1310 1311 |
if (rtn == SUCCESS) { list_splice_init(work_q, &check_list); } else if (rtn == FAST_IO_FAIL) { |
937abeaad [SCSI] use list_f... |
1312 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4c Linux-2.6.12-rc2 |
1313 1314 1315 1316 1317 1318 1319 1320 1321 |
scsi_eh_finish_cmd(scmd, done_q); } } else { SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" " failed ", current->comm)); } } |
3eef6257d [SCSI] Reduce err... |
1322 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4c Linux-2.6.12-rc2 |
1323 1324 1325 1326 1327 1328 |
} /** * scsi_eh_offline_sdevs - offline scsi devices that fail to recover * @work_q: list_head for processed commands. * @done_q: list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1329 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 |
static void scsi_eh_offline_sdevs(struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1333 |
struct scsi_cmnd *scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1334 |
|
937abeaad [SCSI] use list_f... |
1335 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d3 [SCSI] Improve er... |
1336 1337 1338 |
sdev_printk(KERN_INFO, scmd->device, "Device offlined - " "not ready after error recovery "); |
1da177e4c Linux-2.6.12-rc2 |
1339 |
scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d16 [SCSI] remove scs... |
1340 |
if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 |
/* * FIXME: Handle lost cmds. */ } scsi_eh_finish_cmd(scmd, done_q); } return; } /** |
4a27446f3 [SCSI] modify scs... |
1351 1352 1353 1354 1355 1356 1357 1358 1359 |
* scsi_noretry_cmd - determinte if command should be failed fast * @scmd: SCSI cmd to examine. */ int scsi_noretry_cmd(struct scsi_cmnd *scmd) { switch (host_byte(scmd->result)) { case DID_OK: break; case DID_BUS_BUSY: |
33659ebba block: remove wra... |
1360 |
return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f3 [SCSI] modify scs... |
1361 |
case DID_PARITY: |
33659ebba block: remove wra... |
1362 |
return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f3 [SCSI] modify scs... |
1363 1364 1365 1366 1367 1368 |
case DID_ERROR: if (msg_byte(scmd->result) == COMMAND_COMPLETE && status_byte(scmd->result) == RESERVATION_CONFLICT) return 0; /* fall through */ case DID_SOFT_ERROR: |
33659ebba block: remove wra... |
1369 |
return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f3 [SCSI] modify scs... |
1370 1371 1372 1373 1374 1375 1376 1377 |
} switch (status_byte(scmd->result)) { case CHECK_CONDITION: /* * assume caller has checked sense and determinted * the check condition was retryable. */ |
e96f6abe0 scsi: use REQ_TYP... |
1378 1379 1380 |
if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) return 1; |
4a27446f3 [SCSI] modify scs... |
1381 1382 1383 1384 1385 1386 |
} return 0; } /** |
1da177e4c Linux-2.6.12-rc2 |
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 |
* scsi_decide_disposition - Disposition a cmd on return from LLD. * @scmd: SCSI cmd to examine. * * Notes: * This is *only* called when we are examining the status after sending * out the actual data command. any commands that are queued for error * recovery (e.g. test_unit_ready) do *not* come through here. * * When this routine returns failed, it means the error handler thread * is woken. In cases where the error code indicates an error that * doesn't require the error handler read (i.e. we don't need to * abort/reset), this function should return SUCCESS. |
dc8875e10 [SCSI] docbook an... |
1399 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 |
int scsi_decide_disposition(struct scsi_cmnd *scmd) { int rtn; /* * if the device is offline, then we clearly just pass the result back * up to the top level. */ if (!scsi_device_online(scmd->device)) { SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" " as SUCCESS ", |
cadbd4a5e [SCSI] replace __... |
1412 |
__func__)); |
1da177e4c Linux-2.6.12-rc2 |
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 |
return SUCCESS; } /* * first check the host byte, to see if there is anything in there * that would indicate what we need to do. */ switch (host_byte(scmd->result)) { case DID_PASSTHROUGH: /* * no matter what, pass this through to the upper layer. * nuke this special code so that it looks like we are saying * did_ok. */ scmd->result &= 0xff00ffff; return SUCCESS; case DID_OK: /* * looks good. drop through, and check the next byte. */ break; case DID_NO_CONNECT: case DID_BAD_TARGET: case DID_ABORT: /* * note - this means that we just report the status back * to the top level driver, not that we actually think * that it indicates SUCCESS. */ return SUCCESS; /* * when the low level driver returns did_soft_error, |
0bf8c8697 Reduce sequential... |
1445 |
* it is responsible for keeping an internal retry counter |
1da177e4c Linux-2.6.12-rc2 |
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 |
* in order to avoid endless loops (db) * * actually this is a bug in this function here. we should * be mindful of the maximum number of retries specified * and not get stuck in a loop. */ case DID_SOFT_ERROR: goto maybe_retry; case DID_IMM_RETRY: return NEEDS_RETRY; |
bf341919d scsi: add DID_REQ... |
1456 1457 |
case DID_REQUEUE: return ADD_TO_MLQUEUE; |
a4dfaa6f2 [SCSI] scsi: add ... |
1458 1459 1460 1461 1462 |
case DID_TRANSPORT_DISRUPTED: /* * LLD/transport was disrupted during processing of the IO. * The transport class is now blocked/blocking, * and the transport will decide what to do with the IO |
939c2288c [SCSI] scsi_error... |
1463 1464 |
* based on its timers and recovery capablilities if * there are enough retries. |
a4dfaa6f2 [SCSI] scsi: add ... |
1465 |
*/ |
939c2288c [SCSI] scsi_error... |
1466 |
goto maybe_retry; |
a4dfaa6f2 [SCSI] scsi: add ... |
1467 1468 1469 1470 1471 1472 |
case DID_TRANSPORT_FAILFAST: /* * The transport decided to failfast the IO (most likely * the fast io fail tmo fired), so send IO directly upwards. */ return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
1473 1474 1475 1476 1477 1478 1479 1480 1481 |
case DID_ERROR: if (msg_byte(scmd->result) == COMMAND_COMPLETE && status_byte(scmd->result) == RESERVATION_CONFLICT) /* * execute reservation conflict processing code * lower down */ break; /* fallthrough */ |
1da177e4c Linux-2.6.12-rc2 |
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 |
case DID_BUS_BUSY: case DID_PARITY: goto maybe_retry; case DID_TIME_OUT: /* * when we scan the bus, we get timeout messages for * these commands if there is no device available. * other hosts report did_no_connect for the same thing. */ if ((scmd->cmnd[0] == TEST_UNIT_READY || scmd->cmnd[0] == INQUIRY)) { return SUCCESS; } else { return FAILED; } case DID_RESET: return SUCCESS; default: return FAILED; } /* * next, check the message byte. */ if (msg_byte(scmd->result) != COMMAND_COMPLETE) return FAILED; /* * check the status byte to see if this indicates anything special. */ switch (status_byte(scmd->result)) { case QUEUE_FULL: |
42a6a9183 [SCSI] scsi error... |
1514 |
scsi_handle_queue_full(scmd->device); |
1da177e4c Linux-2.6.12-rc2 |
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 |
/* * the case of trying to send too many commands to a * tagged queueing device. */ case BUSY: /* * device can't talk to us at the moment. Should only * occur (SAM-3) when the task queue is empty, so will cause * the empty queue handling to trigger a stall in the * device. */ return ADD_TO_MLQUEUE; case GOOD: |
4a84067db [SCSI] add queue_... |
1528 |
scsi_handle_queue_ramp_up(scmd->device); |
1da177e4c Linux-2.6.12-rc2 |
1529 |
case COMMAND_TERMINATED: |
1da177e4c Linux-2.6.12-rc2 |
1530 |
return SUCCESS; |
a9b589d90 [SCSI] scsi_error... |
1531 1532 |
case TASK_ABORTED: goto maybe_retry; |
1da177e4c Linux-2.6.12-rc2 |
1533 1534 1535 1536 |
case CHECK_CONDITION: rtn = scsi_check_sense(scmd); if (rtn == NEEDS_RETRY) goto maybe_retry; |
63583cca7 [SCSI] Add detail... |
1537 1538 1539 1540 1541 1542 1543 1544 |
else if (rtn == TARGET_ERROR) { /* * Need to modify host byte to signal a * permanent target failure */ scmd->result |= (DID_TARGET_FAILURE << 16); rtn = SUCCESS; } |
1da177e4c Linux-2.6.12-rc2 |
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 |
/* if rtn == FAILED, we have no sense information; * returning FAILED will wake the error handler thread * to collect the sense and redo the decide * disposition */ return rtn; case CONDITION_GOOD: case INTERMEDIATE_GOOD: case INTERMEDIATE_C_GOOD: case ACA_ACTIVE: /* * who knows? FIXME(eric) */ return SUCCESS; case RESERVATION_CONFLICT: |
9ccfc756a [SCSI] move the m... |
1560 1561 1562 |
sdev_printk(KERN_INFO, scmd->device, "reservation conflict "); |
63583cca7 [SCSI] Add detail... |
1563 |
scmd->result |= (DID_NEXUS_FAILURE << 16); |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 |
return SUCCESS; /* causes immediate i/o error */ default: return FAILED; } return FAILED; maybe_retry: /* we requeue for retry because the error was retryable, and * the request was not marked fast fail. Note that above, * even if the request is marked fast fail, we still requeue * for queue congestion conditions (QUEUE_FULL or BUSY) */ |
8884efab1 [SCSI] scsi: scsi... |
1576 |
if ((++scmd->retries) <= scmd->allowed |
4a27446f3 [SCSI] modify scs... |
1577 |
&& !scsi_noretry_cmd(scmd)) { |
1da177e4c Linux-2.6.12-rc2 |
1578 1579 1580 1581 1582 1583 1584 1585 |
return NEEDS_RETRY; } else { /* * no more retries - report this one back to upper level. */ return SUCCESS; } } |
f078727b2 [SCSI] remove scs... |
1586 1587 1588 1589 |
static void eh_lock_door_done(struct request *req, int uptodate) { __blk_put_request(req->q, req); } |
1da177e4c Linux-2.6.12-rc2 |
1590 |
/** |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 1593 1594 |
* scsi_eh_lock_door - Prevent medium removal for the specified device * @sdev: SCSI device to prevent medium removal * * Locking: |
91bc31fb3 [SCSI] fix up scs... |
1595 |
* We must be called from process context. |
1da177e4c Linux-2.6.12-rc2 |
1596 1597 1598 1599 |
* * Notes: * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the * head of the devices request queue, and continue. |
dc8875e10 [SCSI] docbook an... |
1600 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1601 1602 |
static void scsi_eh_lock_door(struct scsi_device *sdev) { |
f078727b2 [SCSI] remove scs... |
1603 |
struct request *req; |
1da177e4c Linux-2.6.12-rc2 |
1604 |
|
91bc31fb3 [SCSI] fix up scs... |
1605 1606 1607 1608 |
/* * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a * request becomes available */ |
f078727b2 [SCSI] remove scs... |
1609 |
req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1610 |
|
f078727b2 [SCSI] remove scs... |
1611 1612 1613 1614 1615 1616 |
req->cmd[0] = ALLOW_MEDIUM_REMOVAL; req->cmd[1] = 0; req->cmd[2] = 0; req->cmd[3] = 0; req->cmd[4] = SCSI_REMOVAL_PREVENT; req->cmd[5] = 0; |
1da177e4c Linux-2.6.12-rc2 |
1617 |
|
f078727b2 [SCSI] remove scs... |
1618 1619 1620 1621 1622 1623 1624 1625 1626 |
req->cmd_len = COMMAND_SIZE(req->cmd[0]); req->cmd_type = REQ_TYPE_BLOCK_PC; req->cmd_flags |= REQ_QUIET; req->timeout = 10 * HZ; req->retries = 5; blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); } |
1da177e4c Linux-2.6.12-rc2 |
1627 1628 1629 1630 1631 1632 1633 1634 |
/** * scsi_restart_operations - restart io operations to the specified host. * @shost: Host we are restarting. * * Notes: * When we entered the error handler, we blocked all further i/o to * this device. we need to 'reverse' this process. |
dc8875e10 [SCSI] docbook an... |
1635 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1636 1637 1638 |
static void scsi_restart_operations(struct Scsi_Host *shost) { struct scsi_device *sdev; |
939647ee3 [SCSI] fix oops o... |
1639 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 |
/* * If the door was locked, we need to insert a door lock request * onto the head of the SCSI request queue for the device. There * is no point trying to lock the door of an off-line device. */ shost_for_each_device(sdev, shost) { if (scsi_device_online(sdev) && sdev->locked) scsi_eh_lock_door(sdev); } /* * next free up anything directly waiting upon the host. this * will be requests for character device operations, and also for * ioctls to queued block devices. */ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart ", |
cadbd4a5e [SCSI] replace __... |
1658 |
__func__)); |
1da177e4c Linux-2.6.12-rc2 |
1659 |
|
939647ee3 [SCSI] fix oops o... |
1660 1661 1662 1663 1664 |
spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_set_state(shost, SHOST_RUNNING)) if (scsi_host_set_state(shost, SHOST_CANCEL)) BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 |
wake_up(&shost->host_wait); /* * finally we need to re-initiate requests that may be pending. we will * have had everything blocked while error handling is taking place, and * now that error recovery is done, we will need to ensure that these * requests are started. */ scsi_run_host_queues(shost); } /** * scsi_eh_ready_devs - check device ready state and recover if not. * @shost: host to be recovered. |
eb44820c2 [SCSI] Add Docume... |
1680 1681 |
* @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1682 |
*/ |
dca84e469 [SCSI] scsi_error... |
1683 1684 1685 |
void scsi_eh_ready_devs(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
1686 1687 1688 |
{ if (!scsi_eh_stu(shost, work_q, done_q)) if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) |
30bd7df8c [SCSI] scsi_error... |
1689 1690 1691 1692 1693 |
if (!scsi_eh_target_reset(shost, work_q, done_q)) if (!scsi_eh_bus_reset(shost, work_q, done_q)) if (!scsi_eh_host_reset(work_q, done_q)) scsi_eh_offline_sdevs(work_q, done_q); |
1da177e4c Linux-2.6.12-rc2 |
1694 |
} |
dca84e469 [SCSI] scsi_error... |
1695 |
EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4c Linux-2.6.12-rc2 |
1696 1697 1698 1699 |
/** * scsi_eh_flush_done_q - finish processed commands or retry them. * @done_q: list_head of processed commands. |
dc8875e10 [SCSI] docbook an... |
1700 |
*/ |
041c5fc33 [PATCH] SCSI: exp... |
1701 |
void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
1702 |
{ |
937abeaad [SCSI] use list_f... |
1703 |
struct scsi_cmnd *scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1704 |
|
937abeaad [SCSI] use list_f... |
1705 1706 |
list_for_each_entry_safe(scmd, next, done_q, eh_entry) { list_del_init(&scmd->eh_entry); |
1da177e4c Linux-2.6.12-rc2 |
1707 |
if (scsi_device_online(scmd->device) && |
4a27446f3 [SCSI] modify scs... |
1708 |
!scsi_noretry_cmd(scmd) && |
8884efab1 [SCSI] scsi: scsi... |
1709 |
(++scmd->retries <= scmd->allowed)) { |
1da177e4c Linux-2.6.12-rc2 |
1710 1711 1712 1713 1714 1715 1716 |
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" " retry cmd: %p ", current->comm, scmd)); scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); } else { |
793698ce2 [SCSI] saved and ... |
1717 1718 1719 1720 1721 |
/* * If just we got sense for the device (called * scsi_eh_get_sense), scmd->result is already * set, do not set DRIVER_TIMEOUT. */ |
1da177e4c Linux-2.6.12-rc2 |
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 |
if (!scmd->result) scmd->result |= (DRIVER_TIMEOUT << 24); SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" " cmd: %p ", current->comm, scmd)); scsi_finish_command(scmd); } } } |
041c5fc33 [PATCH] SCSI: exp... |
1732 |
EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 |
/** * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. * @shost: Host to unjam. * * Notes: * When we come in here, we *know* that all commands on the bus have * either completed, failed or timed out. we also know that no further * commands are being sent to the host, so things are relatively quiet * and we have freedom to fiddle with things as we wish. * * This is only the *default* implementation. it is possible for * individual drivers to supply their own version of this function, and * if the maintainer wishes to do this, it is strongly suggested that * this function be taken as a template and modified. this function * was designed to correctly handle problems for about 95% of the * different cases out there, and it should always provide at least a * reasonable amount of error recovery. * * Any command marked 'failed' or 'timeout' must eventually have * scsi_finish_cmd() called for it. we do all of the retry stuff * here, so when we restart the host after we return it should have an * empty queue. |
dc8875e10 [SCSI] docbook an... |
1756 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 |
static void scsi_unjam_host(struct Scsi_Host *shost) { unsigned long flags; LIST_HEAD(eh_work_q); LIST_HEAD(eh_done_q); spin_lock_irqsave(shost->host_lock, flags); list_splice_init(&shost->eh_cmd_q, &eh_work_q); spin_unlock_irqrestore(shost->host_lock, flags); SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); scsi_eh_flush_done_q(&eh_done_q); } /** |
ad42eb1b7 [SCSI] tidy up sc... |
1777 |
* scsi_error_handler - SCSI error handler thread |
1da177e4c Linux-2.6.12-rc2 |
1778 1779 1780 |
* @data: Host for which we are running. * * Notes: |
ad42eb1b7 [SCSI] tidy up sc... |
1781 1782 |
* This is the main error handling loop. This is run as a kernel thread * for every SCSI host and handles all error handling activity. |
dc8875e10 [SCSI] docbook an... |
1783 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1784 1785 |
int scsi_error_handler(void *data) { |
ad42eb1b7 [SCSI] tidy up sc... |
1786 |
struct Scsi_Host *shost = data; |
1da177e4c Linux-2.6.12-rc2 |
1787 |
|
1da177e4c Linux-2.6.12-rc2 |
1788 |
/* |
ad42eb1b7 [SCSI] tidy up sc... |
1789 1790 1791 |
* We use TASK_INTERRUPTIBLE so that the thread is not * counted against the load average as a running process. * We never actually get interrupted because kthread_run |
c03264a79 trivial: fix sing... |
1792 |
* disables signal delivery for the created thread. |
1da177e4c Linux-2.6.12-rc2 |
1793 |
*/ |
3ed7a4704 [SCSI] Fix thread... |
1794 1795 |
set_current_state(TASK_INTERRUPTIBLE); while (!kthread_should_stop()) { |
ee7863bc6 [PATCH] SCSI: imp... |
1796 |
if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a4704 [SCSI] Fix thread... |
1797 |
shost->host_failed != shost->host_busy) { |
ad42eb1b7 [SCSI] tidy up sc... |
1798 1799 1800 1801 |
SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler scsi_eh_%d sleeping ", shost->host_no)); |
3ed7a4704 [SCSI] Fix thread... |
1802 1803 1804 1805 |
schedule(); set_current_state(TASK_INTERRUPTIBLE); continue; } |
1da177e4c Linux-2.6.12-rc2 |
1806 |
|
3ed7a4704 [SCSI] Fix thread... |
1807 |
__set_current_state(TASK_RUNNING); |
ad42eb1b7 [SCSI] tidy up sc... |
1808 1809 1810 1811 |
SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler scsi_eh_%d waking up ", shost->host_no)); |
1da177e4c Linux-2.6.12-rc2 |
1812 |
|
1da177e4c Linux-2.6.12-rc2 |
1813 1814 1815 1816 1817 |
/* * We have a host that is failing for some reason. Figure out * what we need to do to get it up and online again (if we can). * If we fail, we end up taking the thing offline. */ |
ae0751ffc [SCSI] add flag t... |
1818 |
if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f24014 [SCSI] implement ... |
1819 1820 1821 1822 1823 1824 1825 |
SCSI_LOG_ERROR_RECOVERY(1, printk(KERN_ERR "Error handler scsi_eh_%d " "unable to autoresume ", shost->host_no)); continue; } |
9227c33de [PATCH] move ->eh... |
1826 1827 |
if (shost->transportt->eh_strategy_handler) shost->transportt->eh_strategy_handler(shost); |
1da177e4c Linux-2.6.12-rc2 |
1828 1829 |
else scsi_unjam_host(shost); |
1da177e4c Linux-2.6.12-rc2 |
1830 1831 1832 1833 1834 1835 1836 1837 |
/* * Note - if the above fails completely, the action is to take * individual devices offline and flush the queue of any * outstanding requests that may have been pending. When we * restart, we restart any I/O to any other devices on the bus * which are still online. */ scsi_restart_operations(shost); |
ae0751ffc [SCSI] add flag t... |
1838 1839 |
if (!shost->eh_noresume) scsi_autopm_put_host(shost); |
3ed7a4704 [SCSI] Fix thread... |
1840 |
set_current_state(TASK_INTERRUPTIBLE); |
1da177e4c Linux-2.6.12-rc2 |
1841 |
} |
461a0ffbe [PATCH] scsi_erro... |
1842 |
__set_current_state(TASK_RUNNING); |
ad42eb1b7 [SCSI] tidy up sc... |
1843 1844 1845 |
SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler scsi_eh_%d exiting ", shost->host_no)); |
3ed7a4704 [SCSI] Fix thread... |
1846 |
shost->ehandler = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 |
return 0; } /* * Function: scsi_report_bus_reset() * * Purpose: Utility function used by low-level drivers to report that * they have observed a bus reset on the bus being handled. * * Arguments: shost - Host in question * channel - channel on which reset was observed. * * Returns: Nothing * * Lock status: Host lock must be held. * * Notes: This only needs to be called if the reset is one which * originates from an unknown location. Resets originated * by the mid-level itself don't need to call this, but there * should be no harm. * * The main purpose of this is to make sure that a CHECK_CONDITION * is properly treated. */ void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) { struct scsi_device *sdev; __shost_for_each_device(sdev, shost) { |
30bd7df8c [SCSI] scsi_error... |
1876 1877 |
if (channel == sdev_channel(sdev)) __scsi_report_device_reset(sdev, NULL); |
1da177e4c Linux-2.6.12-rc2 |
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} } EXPORT_SYMBOL(scsi_report_bus_reset); /* * Function: scsi_report_device_reset() * * Purpose: Utility function used by low-level drivers to report that * they have observed a device reset on the device being handled. * * Arguments: shost - Host in question * channel - channel on which reset was observed * target - target on which reset was observed * * Returns: Nothing * * Lock status: Host lock must be held * * Notes: This only needs to be called if the reset is one which * originates from an unknown location. Resets originated * by the mid-level itself don't need to call this, but there * should be no harm. * * The main purpose of this is to make sure that a CHECK_CONDITION * is properly treated. */ void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) { struct scsi_device *sdev; __shost_for_each_device(sdev, shost) { |
422c0d61d [SCSI] use scmd_i... |
1909 |
if (channel == sdev_channel(sdev) && |
30bd7df8c [SCSI] scsi_error... |
1910 1911 |
target == sdev_id(sdev)) __scsi_report_device_reset(sdev, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 |
} } EXPORT_SYMBOL(scsi_report_device_reset); static void scsi_reset_provider_done_command(struct scsi_cmnd *scmd) { } /* * Function: scsi_reset_provider * * Purpose: Send requested reset to a bus or device at any phase. * * Arguments: device - device to send reset to * flag - reset type (see scsi.h) * * Returns: SUCCESS/FAILURE. * * Notes: This is used by the SCSI Generic driver to provide * Bus/Device reset capability. */ int scsi_reset_provider(struct scsi_device *dev, int flag) { |
bc4f24014 [SCSI] implement ... |
1937 |
struct scsi_cmnd *scmd; |
d7a1bb0a0 [SCSI] Block I/O ... |
1938 |
struct Scsi_Host *shost = dev->host; |
1da177e4c Linux-2.6.12-rc2 |
1939 |
struct request req; |
d7a1bb0a0 [SCSI] Block I/O ... |
1940 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
1941 |
int rtn; |
bc4f24014 [SCSI] implement ... |
1942 1943 1944 1945 |
if (scsi_autopm_get_host(shost) < 0) return FAILED; scmd = scsi_get_command(dev, GFP_KERNEL); |
4f54eec83 block: use blk_rq... |
1946 |
blk_rq_init(NULL, &req); |
1da177e4c Linux-2.6.12-rc2 |
1947 |
scmd->request = &req; |
b4edcbcaf [SCSI] remove scs... |
1948 |
|
64a87b244 [SCSI] Let scsi_c... |
1949 |
scmd->cmnd = req.cmd; |
1da177e4c Linux-2.6.12-rc2 |
1950 |
scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b2 [SCSI] implement ... |
1951 |
memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4c Linux-2.6.12-rc2 |
1952 1953 1954 1955 |
scmd->cmd_len = 0; scmd->sc_data_direction = DMA_BIDIRECTIONAL; |
1da177e4c Linux-2.6.12-rc2 |
1956 |
|
d7a1bb0a0 [SCSI] Block I/O ... |
1957 1958 1959 |
spin_lock_irqsave(shost->host_lock, flags); shost->tmf_in_progress = 1; spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
1960 1961 1962 1963 1964 1965 |
switch (flag) { case SCSI_TRY_RESET_DEVICE: rtn = scsi_try_bus_device_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ |
30bd7df8c [SCSI] scsi_error... |
1966 1967 1968 1969 1970 |
case SCSI_TRY_RESET_TARGET: rtn = scsi_try_target_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ |
1da177e4c Linux-2.6.12-rc2 |
1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 |
case SCSI_TRY_RESET_BUS: rtn = scsi_try_bus_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ case SCSI_TRY_RESET_HOST: rtn = scsi_try_host_reset(scmd); break; default: rtn = FAILED; } |
d7a1bb0a0 [SCSI] Block I/O ... |
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 |
spin_lock_irqsave(shost->host_lock, flags); shost->tmf_in_progress = 0; spin_unlock_irqrestore(shost->host_lock, flags); /* * be sure to wake up anyone who was sleeping or had their queue * suspended while we performed the TMF. */ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart after TMF ", |
cadbd4a5e [SCSI] replace __... |
1993 |
__func__)); |
d7a1bb0a0 [SCSI] Block I/O ... |
1994 1995 1996 1997 |
wake_up(&shost->host_wait); scsi_run_host_queues(shost); |
1da177e4c Linux-2.6.12-rc2 |
1998 |
scsi_next_command(scmd); |
bc4f24014 [SCSI] implement ... |
1999 |
scsi_autopm_put_host(shost); |
1da177e4c Linux-2.6.12-rc2 |
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 |
return rtn; } EXPORT_SYMBOL(scsi_reset_provider); /** * scsi_normalize_sense - normalize main elements from either fixed or * descriptor sense data format into a common format. * * @sense_buffer: byte array containing sense data returned by device * @sb_len: number of valid bytes in sense_buffer * @sshdr: pointer to instance of structure that common * elements are written to. * * Notes: * The "main elements" from sense data are: response_code, sense_key, * asc, ascq and additional_length (only for descriptor format). * * Typically this function can be called after a device has * responded to a SCSI command with the CHECK_CONDITION status. * * Return value: * 1 if valid sense data information found, else 0; |
dc8875e10 [SCSI] docbook an... |
2022 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2023 2024 2025 |
int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, struct scsi_sense_hdr *sshdr) { |
33aa687db [SCSI] convert SP... |
2026 |
if (!sense_buffer || !sb_len) |
1da177e4c Linux-2.6.12-rc2 |
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return 0; memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); sshdr->response_code = (sense_buffer[0] & 0x7f); |
33aa687db [SCSI] convert SP... |
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if (!scsi_sense_valid(sshdr)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
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if (sshdr->response_code >= 0x72) { /* * descriptor format */ if (sb_len > 1) sshdr->sense_key = (sense_buffer[1] & 0xf); if (sb_len > 2) sshdr->asc = sense_buffer[2]; if (sb_len > 3) sshdr->ascq = sense_buffer[3]; if (sb_len > 7) sshdr->additional_length = sense_buffer[7]; } else { |
0bf8c8697 Reduce sequential... |
2048 |
/* |
1da177e4c Linux-2.6.12-rc2 |
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 |
* fixed format */ if (sb_len > 2) sshdr->sense_key = (sense_buffer[2] & 0xf); if (sb_len > 7) { sb_len = (sb_len < (sense_buffer[7] + 8)) ? sb_len : (sense_buffer[7] + 8); if (sb_len > 12) sshdr->asc = sense_buffer[12]; if (sb_len > 13) sshdr->ascq = sense_buffer[13]; } } return 1; } EXPORT_SYMBOL(scsi_normalize_sense); |
1da177e4c Linux-2.6.12-rc2 |
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int scsi_command_normalize_sense(struct scsi_cmnd *cmd, struct scsi_sense_hdr *sshdr) { return scsi_normalize_sense(cmd->sense_buffer, |
b80ca4f7e [SCSI] replace si... |
2070 |
SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4c Linux-2.6.12-rc2 |
2071 2072 2073 2074 |
} EXPORT_SYMBOL(scsi_command_normalize_sense); /** |
eb44820c2 [SCSI] Add Docume... |
2075 |
* scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4c Linux-2.6.12-rc2 |
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 |
* @sense_buffer: byte array of descriptor format sense data * @sb_len: number of valid bytes in sense_buffer * @desc_type: value of descriptor type to find * (e.g. 0 -> information) * * Notes: * only valid when sense data is in descriptor format * * Return value: * pointer to start of (first) descriptor if found else NULL |
dc8875e10 [SCSI] docbook an... |
2086 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 |
const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, int desc_type) { int add_sen_len, add_len, desc_len, k; const u8 * descp; if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) return NULL; if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) return NULL; add_sen_len = (add_sen_len < (sb_len - 8)) ? add_sen_len : (sb_len - 8); descp = &sense_buffer[8]; for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { descp += desc_len; add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; desc_len = add_len + 2; if (descp[0] == desc_type) return descp; if (add_len < 0) // short descriptor ?? break; } return NULL; } EXPORT_SYMBOL(scsi_sense_desc_find); /** |
eb44820c2 [SCSI] Add Docume... |
2114 |
* scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4c Linux-2.6.12-rc2 |
2115 2116 2117 2118 2119 2120 2121 |
* @sense_buffer: byte array of sense data * @sb_len: number of valid bytes in sense_buffer * @info_out: pointer to 64 integer where 8 or 4 byte information * field will be placed if found. * * Return value: * 1 if information field found, 0 if not found. |
dc8875e10 [SCSI] docbook an... |
2122 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 |
int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, u64 * info_out) { int j; const u8 * ucp; u64 ull; if (sb_len < 7) return 0; switch (sense_buffer[0] & 0x7f) { case 0x70: case 0x71: if (sense_buffer[0] & 0x80) { *info_out = (sense_buffer[3] << 24) + (sense_buffer[4] << 16) + (sense_buffer[5] << 8) + sense_buffer[6]; return 1; } else return 0; case 0x72: case 0x73: ucp = scsi_sense_desc_find(sense_buffer, sb_len, 0 /* info desc */); if (ucp && (0xa == ucp[1])) { ull = 0; for (j = 0; j < 8; ++j) { if (j > 0) ull <<= 8; ull |= ucp[4 + j]; } *info_out = ull; return 1; } else return 0; default: return 0; } } EXPORT_SYMBOL(scsi_get_sense_info_fld); |
3bc6a2619 [SCSI] add scsi_b... |
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 |
/** * scsi_build_sense_buffer - build sense data in a buffer * @desc: Sense format (non zero == descriptor format, * 0 == fixed format) * @buf: Where to build sense data * @key: Sense key * @asc: Additional sense code * @ascq: Additional sense code qualifier * **/ void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) { if (desc) { buf[0] = 0x72; /* descriptor, current */ buf[1] = key; buf[2] = asc; buf[3] = ascq; buf[7] = 0; } else { buf[0] = 0x70; /* fixed, current */ buf[2] = key; buf[7] = 0xa; buf[12] = asc; buf[13] = ascq; } } EXPORT_SYMBOL(scsi_build_sense_buffer); |