2006-04-02 09:51:53 +00:00
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/*
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* libata-eh.c - libata error handling
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*
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* Maintained by: Jeff Garzik <jgarzik@pobox.com>
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* Please ALWAYS copy linux-ide@vger.kernel.org
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* on emails.
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*
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* Copyright 2006 Tejun Heo <htejun@gmail.com>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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*
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* libata documentation is available via 'make {ps|pdf}docs',
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* as Documentation/DocBook/libata.*
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*
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* Hardware documentation available from http://www.t13.org/ and
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* http://www.sata-io.org/
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*
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_cmnd.h>
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#include <linux/libata.h>
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#include "libata.h"
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2006-05-15 11:58:12 +00:00
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static void __ata_port_freeze(struct ata_port *ap);
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2006-04-02 09:51:53 +00:00
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/**
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* ata_scsi_timed_out - SCSI layer time out callback
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* @cmd: timed out SCSI command
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*
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* Handles SCSI layer timeout. We race with normal completion of
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* the qc for @cmd. If the qc is already gone, we lose and let
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* the scsi command finish (EH_HANDLED). Otherwise, the qc has
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* timed out and EH should be invoked. Prevent ata_qc_complete()
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* from finishing it by setting EH_SCHEDULED and return
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* EH_NOT_HANDLED.
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*
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2006-05-15 11:58:12 +00:00
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* TODO: kill this function once old EH is gone.
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*
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2006-04-02 09:51:53 +00:00
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* LOCKING:
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* Called from timer context
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*
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* RETURNS:
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* EH_HANDLED or EH_NOT_HANDLED
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*/
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enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
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{
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struct Scsi_Host *host = cmd->device->host;
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2006-04-11 17:12:34 +00:00
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struct ata_port *ap = ata_shost_to_port(host);
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2006-04-02 09:51:53 +00:00
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unsigned long flags;
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struct ata_queued_cmd *qc;
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2006-05-15 11:58:12 +00:00
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enum scsi_eh_timer_return ret;
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2006-04-02 09:51:53 +00:00
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DPRINTK("ENTER\n");
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2006-05-15 11:58:12 +00:00
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if (ap->ops->error_handler) {
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ret = EH_NOT_HANDLED;
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goto out;
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}
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ret = EH_HANDLED;
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2006-04-02 09:51:53 +00:00
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spin_lock_irqsave(&ap->host_set->lock, flags);
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qc = ata_qc_from_tag(ap, ap->active_tag);
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if (qc) {
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WARN_ON(qc->scsicmd != cmd);
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qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
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qc->err_mask |= AC_ERR_TIMEOUT;
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ret = EH_NOT_HANDLED;
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}
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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2006-05-15 11:58:12 +00:00
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out:
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2006-04-02 09:51:53 +00:00
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DPRINTK("EXIT, ret=%d\n", ret);
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return ret;
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}
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/**
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* ata_scsi_error - SCSI layer error handler callback
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* @host: SCSI host on which error occurred
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*
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* Handles SCSI-layer-thrown error events.
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*
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* LOCKING:
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* Inherited from SCSI layer (none, can sleep)
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*
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* RETURNS:
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* Zero.
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*/
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2006-04-11 17:04:39 +00:00
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void ata_scsi_error(struct Scsi_Host *host)
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2006-04-02 09:51:53 +00:00
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{
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2006-04-11 17:12:34 +00:00
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struct ata_port *ap = ata_shost_to_port(host);
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2006-05-15 11:58:12 +00:00
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spinlock_t *hs_lock = &ap->host_set->lock;
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int i, repeat_cnt = ATA_EH_MAX_REPEAT;
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unsigned long flags;
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2006-04-02 09:51:53 +00:00
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DPRINTK("ENTER\n");
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2006-05-15 11:58:12 +00:00
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/* synchronize with port task */
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2006-04-02 09:51:53 +00:00
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ata_port_flush_task(ap);
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2006-05-15 11:58:12 +00:00
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/* synchronize with host_set lock and sort out timeouts */
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/* For new EH, all qcs are finished in one of three ways -
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* normal completion, error completion, and SCSI timeout.
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* Both cmpletions can race against SCSI timeout. When normal
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* completion wins, the qc never reaches EH. When error
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* completion wins, the qc has ATA_QCFLAG_FAILED set.
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*
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* When SCSI timeout wins, things are a bit more complex.
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* Normal or error completion can occur after the timeout but
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* before this point. In such cases, both types of
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* completions are honored. A scmd is determined to have
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* timed out iff its associated qc is active and not failed.
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*/
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if (ap->ops->error_handler) {
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struct scsi_cmnd *scmd, *tmp;
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int nr_timedout = 0;
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spin_lock_irqsave(hs_lock, flags);
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list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
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struct ata_queued_cmd *qc;
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for (i = 0; i < ATA_MAX_QUEUE; i++) {
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qc = __ata_qc_from_tag(ap, i);
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if (qc->flags & ATA_QCFLAG_ACTIVE &&
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qc->scsicmd == scmd)
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break;
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}
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if (i < ATA_MAX_QUEUE) {
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/* the scmd has an associated qc */
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if (!(qc->flags & ATA_QCFLAG_FAILED)) {
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/* which hasn't failed yet, timeout */
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qc->err_mask |= AC_ERR_TIMEOUT;
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qc->flags |= ATA_QCFLAG_FAILED;
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nr_timedout++;
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}
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} else {
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/* Normal completion occurred after
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* SCSI timeout but before this point.
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* Successfully complete it.
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*/
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scmd->retries = scmd->allowed;
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scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
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}
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}
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/* If we have timed out qcs. They belong to EH from
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* this point but the state of the controller is
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* unknown. Freeze the port to make sure the IRQ
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* handler doesn't diddle with those qcs. This must
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* be done atomically w.r.t. setting QCFLAG_FAILED.
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*/
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if (nr_timedout)
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__ata_port_freeze(ap);
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spin_unlock_irqrestore(hs_lock, flags);
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} else
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spin_unlock_wait(hs_lock);
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repeat:
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/* invoke error handler */
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if (ap->ops->error_handler) {
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/* clear EH pending */
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spin_lock_irqsave(hs_lock, flags);
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ap->flags &= ~ATA_FLAG_EH_PENDING;
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spin_unlock_irqrestore(hs_lock, flags);
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/* invoke EH */
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ap->ops->error_handler(ap);
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/* Exception might have happend after ->error_handler
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* recovered the port but before this point. Repeat
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* EH in such case.
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*/
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spin_lock_irqsave(hs_lock, flags);
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if (ap->flags & ATA_FLAG_EH_PENDING) {
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if (--repeat_cnt) {
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ata_port_printk(ap, KERN_INFO,
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"EH pending after completion, "
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"repeating EH (cnt=%d)\n", repeat_cnt);
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spin_unlock_irqrestore(hs_lock, flags);
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goto repeat;
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}
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ata_port_printk(ap, KERN_ERR, "EH pending after %d "
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"tries, giving up\n", ATA_EH_MAX_REPEAT);
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}
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/* Clear host_eh_scheduled while holding hs_lock such
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* that if exception occurs after this point but
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* before EH completion, SCSI midlayer will
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* re-initiate EH.
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*/
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host->host_eh_scheduled = 0;
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spin_unlock_irqrestore(hs_lock, flags);
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} else {
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WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
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ap->ops->eng_timeout(ap);
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}
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2006-04-02 09:51:53 +00:00
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2006-05-15 11:58:12 +00:00
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/* finish or retry handled scmd's and clean up */
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2006-04-02 09:51:53 +00:00
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WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
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scsi_eh_flush_done_q(&ap->eh_done_q);
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2006-05-15 11:58:12 +00:00
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/* clean up */
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spin_lock_irqsave(hs_lock, flags);
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if (ap->flags & ATA_FLAG_RECOVERED)
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ata_port_printk(ap, KERN_INFO, "EH complete\n");
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ap->flags &= ~ATA_FLAG_RECOVERED;
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spin_unlock_irqrestore(hs_lock, flags);
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2006-04-02 09:51:53 +00:00
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DPRINTK("EXIT\n");
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}
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/**
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* ata_qc_timeout - Handle timeout of queued command
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* @qc: Command that timed out
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*
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* Some part of the kernel (currently, only the SCSI layer)
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* has noticed that the active command on port @ap has not
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* completed after a specified length of time. Handle this
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* condition by disabling DMA (if necessary) and completing
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* transactions, with error if necessary.
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*
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* This also handles the case of the "lost interrupt", where
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* for some reason (possibly hardware bug, possibly driver bug)
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* an interrupt was not delivered to the driver, even though the
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* transaction completed successfully.
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*
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2006-05-15 11:58:12 +00:00
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* TODO: kill this function once old EH is gone.
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*
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2006-04-02 09:51:53 +00:00
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* LOCKING:
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* Inherited from SCSI layer (none, can sleep)
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*/
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static void ata_qc_timeout(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct ata_host_set *host_set = ap->host_set;
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u8 host_stat = 0, drv_stat;
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unsigned long flags;
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DPRINTK("ENTER\n");
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ap->hsm_task_state = HSM_ST_IDLE;
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spin_lock_irqsave(&host_set->lock, flags);
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switch (qc->tf.protocol) {
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case ATA_PROT_DMA:
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case ATA_PROT_ATAPI_DMA:
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host_stat = ap->ops->bmdma_status(ap);
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/* before we do anything else, clear DMA-Start bit */
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ap->ops->bmdma_stop(qc);
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/* fall through */
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default:
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ata_altstatus(ap);
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drv_stat = ata_chk_status(ap);
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/* ack bmdma irq events */
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ap->ops->irq_clear(ap);
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2006-05-15 11:57:56 +00:00
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ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, "
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"stat 0x%x host_stat 0x%x\n",
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qc->tf.command, drv_stat, host_stat);
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2006-04-02 09:51:53 +00:00
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/* complete taskfile transaction */
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qc->err_mask |= ac_err_mask(drv_stat);
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break;
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}
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spin_unlock_irqrestore(&host_set->lock, flags);
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ata_eh_qc_complete(qc);
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DPRINTK("EXIT\n");
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}
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/**
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* ata_eng_timeout - Handle timeout of queued command
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* @ap: Port on which timed-out command is active
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*
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* Some part of the kernel (currently, only the SCSI layer)
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* has noticed that the active command on port @ap has not
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* completed after a specified length of time. Handle this
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* condition by disabling DMA (if necessary) and completing
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* transactions, with error if necessary.
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*
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* This also handles the case of the "lost interrupt", where
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* for some reason (possibly hardware bug, possibly driver bug)
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* an interrupt was not delivered to the driver, even though the
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* transaction completed successfully.
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*
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2006-05-15 11:58:12 +00:00
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* TODO: kill this function once old EH is gone.
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*
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2006-04-02 09:51:53 +00:00
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* LOCKING:
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* Inherited from SCSI layer (none, can sleep)
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*/
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void ata_eng_timeout(struct ata_port *ap)
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{
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DPRINTK("ENTER\n");
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ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
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DPRINTK("EXIT\n");
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}
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2006-05-15 11:58:05 +00:00
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/**
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* ata_qc_schedule_eh - schedule qc for error handling
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* @qc: command to schedule error handling for
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*
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* Schedule error handling for @qc. EH will kick in as soon as
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* other commands are drained.
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*
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* LOCKING:
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* spin_lock_irqsave(host_set lock)
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*/
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void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
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{
|
|
|
|
struct ata_port *ap = qc->ap;
|
|
|
|
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
|
|
|
|
qc->flags |= ATA_QCFLAG_FAILED;
|
|
|
|
qc->ap->flags |= ATA_FLAG_EH_PENDING;
|
|
|
|
|
|
|
|
/* The following will fail if timeout has already expired.
|
|
|
|
* ata_scsi_error() takes care of such scmds on EH entry.
|
|
|
|
* Note that ATA_QCFLAG_FAILED is unconditionally set after
|
|
|
|
* this function completes.
|
|
|
|
*/
|
|
|
|
scsi_req_abort_cmd(qc->scsicmd);
|
|
|
|
}
|
|
|
|
|
2006-05-15 11:58:07 +00:00
|
|
|
/**
|
|
|
|
* ata_port_schedule_eh - schedule error handling without a qc
|
|
|
|
* @ap: ATA port to schedule EH for
|
|
|
|
*
|
|
|
|
* Schedule error handling for @ap. EH will kick in as soon as
|
|
|
|
* all commands are drained.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* spin_lock_irqsave(host_set lock)
|
|
|
|
*/
|
|
|
|
void ata_port_schedule_eh(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
|
|
|
|
ap->flags |= ATA_FLAG_EH_PENDING;
|
|
|
|
ata_schedule_scsi_eh(ap->host);
|
|
|
|
|
|
|
|
DPRINTK("port EH scheduled\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_port_abort - abort all qc's on the port
|
|
|
|
* @ap: ATA port to abort qc's for
|
|
|
|
*
|
|
|
|
* Abort all active qc's of @ap and schedule EH.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* spin_lock_irqsave(host_set lock)
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Number of aborted qc's.
|
|
|
|
*/
|
|
|
|
int ata_port_abort(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
int tag, nr_aborted = 0;
|
|
|
|
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
|
|
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
|
|
|
|
|
|
|
|
if (qc) {
|
|
|
|
qc->flags |= ATA_QCFLAG_FAILED;
|
|
|
|
ata_qc_complete(qc);
|
|
|
|
nr_aborted++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!nr_aborted)
|
|
|
|
ata_port_schedule_eh(ap);
|
|
|
|
|
|
|
|
return nr_aborted;
|
|
|
|
}
|
|
|
|
|
2006-05-15 11:58:09 +00:00
|
|
|
/**
|
|
|
|
* __ata_port_freeze - freeze port
|
|
|
|
* @ap: ATA port to freeze
|
|
|
|
*
|
|
|
|
* This function is called when HSM violation or some other
|
|
|
|
* condition disrupts normal operation of the port. Frozen port
|
|
|
|
* is not allowed to perform any operation until the port is
|
|
|
|
* thawed, which usually follows a successful reset.
|
|
|
|
*
|
|
|
|
* ap->ops->freeze() callback can be used for freezing the port
|
|
|
|
* hardware-wise (e.g. mask interrupt and stop DMA engine). If a
|
|
|
|
* port cannot be frozen hardware-wise, the interrupt handler
|
|
|
|
* must ack and clear interrupts unconditionally while the port
|
|
|
|
* is frozen.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* spin_lock_irqsave(host_set lock)
|
|
|
|
*/
|
|
|
|
static void __ata_port_freeze(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
|
|
|
|
if (ap->ops->freeze)
|
|
|
|
ap->ops->freeze(ap);
|
|
|
|
|
|
|
|
ap->flags |= ATA_FLAG_FROZEN;
|
|
|
|
|
|
|
|
DPRINTK("ata%u port frozen\n", ap->id);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_port_freeze - abort & freeze port
|
|
|
|
* @ap: ATA port to freeze
|
|
|
|
*
|
|
|
|
* Abort and freeze @ap.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* spin_lock_irqsave(host_set lock)
|
|
|
|
*
|
|
|
|
* RETURNS:
|
|
|
|
* Number of aborted commands.
|
|
|
|
*/
|
|
|
|
int ata_port_freeze(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
int nr_aborted;
|
|
|
|
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
|
|
|
|
nr_aborted = ata_port_abort(ap);
|
|
|
|
__ata_port_freeze(ap);
|
|
|
|
|
|
|
|
return nr_aborted;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_eh_freeze_port - EH helper to freeze port
|
|
|
|
* @ap: ATA port to freeze
|
|
|
|
*
|
|
|
|
* Freeze @ap.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* None.
|
|
|
|
*/
|
|
|
|
void ata_eh_freeze_port(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (!ap->ops->error_handler)
|
|
|
|
return;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&ap->host_set->lock, flags);
|
|
|
|
__ata_port_freeze(ap);
|
|
|
|
spin_unlock_irqrestore(&ap->host_set->lock, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_port_thaw_port - EH helper to thaw port
|
|
|
|
* @ap: ATA port to thaw
|
|
|
|
*
|
|
|
|
* Thaw frozen port @ap.
|
|
|
|
*
|
|
|
|
* LOCKING:
|
|
|
|
* None.
|
|
|
|
*/
|
|
|
|
void ata_eh_thaw_port(struct ata_port *ap)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
if (!ap->ops->error_handler)
|
|
|
|
return;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&ap->host_set->lock, flags);
|
|
|
|
|
|
|
|
ap->flags &= ~ATA_FLAG_FROZEN;
|
|
|
|
|
|
|
|
if (ap->ops->thaw)
|
|
|
|
ap->ops->thaw(ap);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&ap->host_set->lock, flags);
|
|
|
|
|
|
|
|
DPRINTK("ata%u port thawed\n", ap->id);
|
|
|
|
}
|
|
|
|
|
2006-04-02 09:51:53 +00:00
|
|
|
static void ata_eh_scsidone(struct scsi_cmnd *scmd)
|
|
|
|
{
|
|
|
|
/* nada */
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
|
|
|
|
{
|
|
|
|
struct ata_port *ap = qc->ap;
|
|
|
|
struct scsi_cmnd *scmd = qc->scsicmd;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&ap->host_set->lock, flags);
|
|
|
|
qc->scsidone = ata_eh_scsidone;
|
|
|
|
__ata_qc_complete(qc);
|
|
|
|
WARN_ON(ata_tag_valid(qc->tag));
|
|
|
|
spin_unlock_irqrestore(&ap->host_set->lock, flags);
|
|
|
|
|
|
|
|
scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_eh_qc_complete - Complete an active ATA command from EH
|
|
|
|
* @qc: Command to complete
|
|
|
|
*
|
|
|
|
* Indicate to the mid and upper layers that an ATA command has
|
|
|
|
* completed. To be used from EH.
|
|
|
|
*/
|
|
|
|
void ata_eh_qc_complete(struct ata_queued_cmd *qc)
|
|
|
|
{
|
|
|
|
struct scsi_cmnd *scmd = qc->scsicmd;
|
|
|
|
scmd->retries = scmd->allowed;
|
|
|
|
__ata_eh_qc_complete(qc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
|
|
|
|
* @qc: Command to retry
|
|
|
|
*
|
|
|
|
* Indicate to the mid and upper layers that an ATA command
|
|
|
|
* should be retried. To be used from EH.
|
|
|
|
*
|
|
|
|
* SCSI midlayer limits the number of retries to scmd->allowed.
|
|
|
|
* scmd->retries is decremented for commands which get retried
|
|
|
|
* due to unrelated failures (qc->err_mask is zero).
|
|
|
|
*/
|
|
|
|
void ata_eh_qc_retry(struct ata_queued_cmd *qc)
|
|
|
|
{
|
|
|
|
struct scsi_cmnd *scmd = qc->scsicmd;
|
|
|
|
if (!qc->err_mask && scmd->retries)
|
|
|
|
scmd->retries--;
|
|
|
|
__ata_eh_qc_complete(qc);
|
|
|
|
}
|