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![Jeff Garzik](/assets/img/avatar_default.png)
Prepare for changes required to support SATA devices attached to SAS HBAs. For these devices we don't want to use host_set at all, since libata will not be the owner of struct scsi_host. Signed-off-by: Brian King <brking@us.ibm.com> (with slight merge modifications made by...) Signed-off-by: Jeff Garzik <jeff@garzik.org>
1907 lines
45 KiB
C
1907 lines
45 KiB
C
/*
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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 "scsi_transport_api.h"
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#include <linux/libata.h>
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#include "libata.h"
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static void __ata_port_freeze(struct ata_port *ap);
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static void ata_eh_finish(struct ata_port *ap);
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static void ata_ering_record(struct ata_ering *ering, int is_io,
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unsigned int err_mask)
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{
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struct ata_ering_entry *ent;
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WARN_ON(!err_mask);
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ering->cursor++;
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ering->cursor %= ATA_ERING_SIZE;
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ent = &ering->ring[ering->cursor];
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ent->is_io = is_io;
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ent->err_mask = err_mask;
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ent->timestamp = get_jiffies_64();
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}
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static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
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{
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struct ata_ering_entry *ent = &ering->ring[ering->cursor];
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if (!ent->err_mask)
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return NULL;
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return ent;
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}
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static int ata_ering_map(struct ata_ering *ering,
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int (*map_fn)(struct ata_ering_entry *, void *),
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void *arg)
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{
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int idx, rc = 0;
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struct ata_ering_entry *ent;
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idx = ering->cursor;
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do {
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ent = &ering->ring[idx];
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if (!ent->err_mask)
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break;
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rc = map_fn(ent, arg);
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if (rc)
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break;
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idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
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} while (idx != ering->cursor);
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return rc;
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}
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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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* TODO: kill this function once old EH is gone.
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*
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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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struct ata_port *ap = ata_shost_to_port(host);
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unsigned long flags;
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struct ata_queued_cmd *qc;
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enum scsi_eh_timer_return ret;
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DPRINTK("ENTER\n");
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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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spin_lock_irqsave(ap->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->lock, flags);
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out:
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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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void ata_scsi_error(struct Scsi_Host *host)
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{
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struct ata_port *ap = ata_shost_to_port(host);
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spinlock_t *ap_lock = ap->lock;
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int i, repeat_cnt = ATA_EH_MAX_REPEAT;
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unsigned long flags;
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DPRINTK("ENTER\n");
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/* synchronize with port task */
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ata_port_flush_task(ap);
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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(ap_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(ap_lock, flags);
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} else
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spin_unlock_wait(ap_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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/* fetch & clear EH info */
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spin_lock_irqsave(ap_lock, flags);
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memset(&ap->eh_context, 0, sizeof(ap->eh_context));
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ap->eh_context.i = ap->eh_info;
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memset(&ap->eh_info, 0, sizeof(ap->eh_info));
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ap->flags |= ATA_FLAG_EH_IN_PROGRESS;
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ap->flags &= ~ATA_FLAG_EH_PENDING;
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spin_unlock_irqrestore(ap_lock, flags);
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/* invoke EH. if unloading, just finish failed qcs */
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if (!(ap->flags & ATA_FLAG_UNLOADING))
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ap->ops->error_handler(ap);
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else
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ata_eh_finish(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(ap_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(ap_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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/* this run is complete, make sure EH info is clear */
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memset(&ap->eh_info, 0, sizeof(ap->eh_info));
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/* Clear host_eh_scheduled while holding ap_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(ap_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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/* finish or retry handled scmd's and clean up */
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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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/* clean up */
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spin_lock_irqsave(ap_lock, flags);
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if (ap->flags & ATA_FLAG_LOADING) {
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ap->flags &= ~ATA_FLAG_LOADING;
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} else {
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if (ap->flags & ATA_FLAG_SCSI_HOTPLUG)
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queue_work(ata_aux_wq, &ap->hotplug_task);
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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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}
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ap->flags &= ~(ATA_FLAG_SCSI_HOTPLUG | ATA_FLAG_RECOVERED);
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/* tell wait_eh that we're done */
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ap->flags &= ~ATA_FLAG_EH_IN_PROGRESS;
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wake_up_all(&ap->eh_wait_q);
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spin_unlock_irqrestore(ap_lock, flags);
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DPRINTK("EXIT\n");
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}
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/**
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* ata_port_wait_eh - Wait for the currently pending EH to complete
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* @ap: Port to wait EH for
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*
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* Wait until the currently pending EH is complete.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*/
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void ata_port_wait_eh(struct ata_port *ap)
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{
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unsigned long flags;
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DEFINE_WAIT(wait);
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retry:
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spin_lock_irqsave(ap->lock, flags);
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while (ap->flags & (ATA_FLAG_EH_PENDING | ATA_FLAG_EH_IN_PROGRESS)) {
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prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
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spin_unlock_irqrestore(ap->lock, flags);
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schedule();
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spin_lock_irqsave(ap->lock, flags);
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}
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finish_wait(&ap->eh_wait_q, &wait);
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spin_unlock_irqrestore(ap->lock, flags);
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/* make sure SCSI EH is complete */
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if (scsi_host_in_recovery(ap->host)) {
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msleep(10);
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goto retry;
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}
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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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* TODO: kill this function once old EH is gone.
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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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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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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(ap->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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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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/* complete taskfile transaction */
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qc->err_mask |= AC_ERR_TIMEOUT;
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break;
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}
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spin_unlock_irqrestore(ap->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
|
|
* completed after a specified length of time. Handle this
|
|
* condition by disabling DMA (if necessary) and completing
|
|
* transactions, with error if necessary.
|
|
*
|
|
* This also handles the case of the "lost interrupt", where
|
|
* for some reason (possibly hardware bug, possibly driver bug)
|
|
* an interrupt was not delivered to the driver, even though the
|
|
* transaction completed successfully.
|
|
*
|
|
* TODO: kill this function once old EH is gone.
|
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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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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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|
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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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{
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struct ata_port *ap = qc->ap;
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WARN_ON(!ap->ops->error_handler);
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qc->flags |= ATA_QCFLAG_FAILED;
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qc->ap->flags |= ATA_FLAG_EH_PENDING;
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|
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/* The following will fail if timeout has already expired.
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* ata_scsi_error() takes care of such scmds on EH entry.
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* Note that ATA_QCFLAG_FAILED is unconditionally set after
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* this function completes.
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*/
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scsi_req_abort_cmd(qc->scsicmd);
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}
|
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|
|
/**
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|
* ata_port_schedule_eh - schedule error handling without a qc
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|
* @ap: ATA port to schedule EH for
|
|
*
|
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* Schedule error handling for @ap. EH will kick in as soon as
|
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* all 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_port_schedule_eh(struct ata_port *ap)
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{
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WARN_ON(!ap->ops->error_handler);
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ap->flags |= ATA_FLAG_EH_PENDING;
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scsi_schedule_eh(ap->host);
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DPRINTK("port EH scheduled\n");
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}
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|
|
/**
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|
* ata_port_abort - abort all qc's on the port
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|
* @ap: ATA port to abort qc's for
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*
|
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* Abort all active qc's of @ap and schedule EH.
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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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* RETURNS:
|
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* Number of aborted qc's.
|
|
*/
|
|
int ata_port_abort(struct ata_port *ap)
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{
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int tag, nr_aborted = 0;
|
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|
|
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;
|
|
}
|
|
|
|
/**
|
|
* __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->lock, flags);
|
|
__ata_port_freeze(ap);
|
|
spin_unlock_irqrestore(ap->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->lock, flags);
|
|
|
|
ap->flags &= ~ATA_FLAG_FROZEN;
|
|
|
|
if (ap->ops->thaw)
|
|
ap->ops->thaw(ap);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
DPRINTK("ata%u port thawed\n", ap->id);
|
|
}
|
|
|
|
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->lock, flags);
|
|
qc->scsidone = ata_eh_scsidone;
|
|
__ata_qc_complete(qc);
|
|
WARN_ON(ata_tag_valid(qc->tag));
|
|
spin_unlock_irqrestore(ap->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);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_detach_dev - detach ATA device
|
|
* @dev: ATA device to detach
|
|
*
|
|
* Detach @dev.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_detach_dev(struct ata_device *dev)
|
|
{
|
|
struct ata_port *ap = dev->ap;
|
|
unsigned long flags;
|
|
|
|
ata_dev_disable(dev);
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
dev->flags &= ~ATA_DFLAG_DETACH;
|
|
|
|
if (ata_scsi_offline_dev(dev)) {
|
|
dev->flags |= ATA_DFLAG_DETACHED;
|
|
ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
|
|
}
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
static void ata_eh_clear_action(struct ata_device *dev,
|
|
struct ata_eh_info *ehi, unsigned int action)
|
|
{
|
|
int i;
|
|
|
|
if (!dev) {
|
|
ehi->action &= ~action;
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
ehi->dev_action[i] &= ~action;
|
|
} else {
|
|
/* doesn't make sense for port-wide EH actions */
|
|
WARN_ON(!(action & ATA_EH_PERDEV_MASK));
|
|
|
|
/* break ehi->action into ehi->dev_action */
|
|
if (ehi->action & action) {
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
ehi->dev_action[i] |= ehi->action & action;
|
|
ehi->action &= ~action;
|
|
}
|
|
|
|
/* turn off the specified per-dev action */
|
|
ehi->dev_action[dev->devno] &= ~action;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ata_eh_about_to_do - about to perform eh_action
|
|
* @ap: target ATA port
|
|
* @dev: target ATA dev for per-dev action (can be NULL)
|
|
* @action: action about to be performed
|
|
*
|
|
* Called just before performing EH actions to clear related bits
|
|
* in @ap->eh_info such that eh actions are not unnecessarily
|
|
* repeated.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
|
|
unsigned int action)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ata_eh_clear_action(dev, &ap->eh_info, action);
|
|
ap->flags |= ATA_FLAG_RECOVERED;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_done - EH action complete
|
|
* @ap: target ATA port
|
|
* @dev: target ATA dev for per-dev action (can be NULL)
|
|
* @action: action just completed
|
|
*
|
|
* Called right after performing EH actions to clear related bits
|
|
* in @ap->eh_context.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
|
|
unsigned int action)
|
|
{
|
|
ata_eh_clear_action(dev, &ap->eh_context.i, action);
|
|
}
|
|
|
|
/**
|
|
* ata_err_string - convert err_mask to descriptive string
|
|
* @err_mask: error mask to convert to string
|
|
*
|
|
* Convert @err_mask to descriptive string. Errors are
|
|
* prioritized according to severity and only the most severe
|
|
* error is reported.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*
|
|
* RETURNS:
|
|
* Descriptive string for @err_mask
|
|
*/
|
|
static const char * ata_err_string(unsigned int err_mask)
|
|
{
|
|
if (err_mask & AC_ERR_HOST_BUS)
|
|
return "host bus error";
|
|
if (err_mask & AC_ERR_ATA_BUS)
|
|
return "ATA bus error";
|
|
if (err_mask & AC_ERR_TIMEOUT)
|
|
return "timeout";
|
|
if (err_mask & AC_ERR_HSM)
|
|
return "HSM violation";
|
|
if (err_mask & AC_ERR_SYSTEM)
|
|
return "internal error";
|
|
if (err_mask & AC_ERR_MEDIA)
|
|
return "media error";
|
|
if (err_mask & AC_ERR_INVALID)
|
|
return "invalid argument";
|
|
if (err_mask & AC_ERR_DEV)
|
|
return "device error";
|
|
return "unknown error";
|
|
}
|
|
|
|
/**
|
|
* ata_read_log_page - read a specific log page
|
|
* @dev: target device
|
|
* @page: page to read
|
|
* @buf: buffer to store read page
|
|
* @sectors: number of sectors to read
|
|
*
|
|
* Read log page using READ_LOG_EXT command.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, AC_ERR_* mask otherwise.
|
|
*/
|
|
static unsigned int ata_read_log_page(struct ata_device *dev,
|
|
u8 page, void *buf, unsigned int sectors)
|
|
{
|
|
struct ata_taskfile tf;
|
|
unsigned int err_mask;
|
|
|
|
DPRINTK("read log page - page %d\n", page);
|
|
|
|
ata_tf_init(dev, &tf);
|
|
tf.command = ATA_CMD_READ_LOG_EXT;
|
|
tf.lbal = page;
|
|
tf.nsect = sectors;
|
|
tf.hob_nsect = sectors >> 8;
|
|
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
|
|
tf.protocol = ATA_PROT_PIO;
|
|
|
|
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
|
|
buf, sectors * ATA_SECT_SIZE);
|
|
|
|
DPRINTK("EXIT, err_mask=%x\n", err_mask);
|
|
return err_mask;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_read_log_10h - Read log page 10h for NCQ error details
|
|
* @dev: Device to read log page 10h from
|
|
* @tag: Resulting tag of the failed command
|
|
* @tf: Resulting taskfile registers of the failed command
|
|
*
|
|
* Read log page 10h to obtain NCQ error details and clear error
|
|
* condition.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, -errno otherwise.
|
|
*/
|
|
static int ata_eh_read_log_10h(struct ata_device *dev,
|
|
int *tag, struct ata_taskfile *tf)
|
|
{
|
|
u8 *buf = dev->ap->sector_buf;
|
|
unsigned int err_mask;
|
|
u8 csum;
|
|
int i;
|
|
|
|
err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
|
|
if (err_mask)
|
|
return -EIO;
|
|
|
|
csum = 0;
|
|
for (i = 0; i < ATA_SECT_SIZE; i++)
|
|
csum += buf[i];
|
|
if (csum)
|
|
ata_dev_printk(dev, KERN_WARNING,
|
|
"invalid checksum 0x%x on log page 10h\n", csum);
|
|
|
|
if (buf[0] & 0x80)
|
|
return -ENOENT;
|
|
|
|
*tag = buf[0] & 0x1f;
|
|
|
|
tf->command = buf[2];
|
|
tf->feature = buf[3];
|
|
tf->lbal = buf[4];
|
|
tf->lbam = buf[5];
|
|
tf->lbah = buf[6];
|
|
tf->device = buf[7];
|
|
tf->hob_lbal = buf[8];
|
|
tf->hob_lbam = buf[9];
|
|
tf->hob_lbah = buf[10];
|
|
tf->nsect = buf[12];
|
|
tf->hob_nsect = buf[13];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
|
|
* @dev: device to perform REQUEST_SENSE to
|
|
* @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
|
|
*
|
|
* Perform ATAPI REQUEST_SENSE after the device reported CHECK
|
|
* SENSE. This function is EH helper.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, AC_ERR_* mask on failure
|
|
*/
|
|
static unsigned int atapi_eh_request_sense(struct ata_device *dev,
|
|
unsigned char *sense_buf)
|
|
{
|
|
struct ata_port *ap = dev->ap;
|
|
struct ata_taskfile tf;
|
|
u8 cdb[ATAPI_CDB_LEN];
|
|
|
|
DPRINTK("ATAPI request sense\n");
|
|
|
|
ata_tf_init(dev, &tf);
|
|
|
|
/* FIXME: is this needed? */
|
|
memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
|
|
|
|
/* XXX: why tf_read here? */
|
|
ap->ops->tf_read(ap, &tf);
|
|
|
|
/* fill these in, for the case where they are -not- overwritten */
|
|
sense_buf[0] = 0x70;
|
|
sense_buf[2] = tf.feature >> 4;
|
|
|
|
memset(cdb, 0, ATAPI_CDB_LEN);
|
|
cdb[0] = REQUEST_SENSE;
|
|
cdb[4] = SCSI_SENSE_BUFFERSIZE;
|
|
|
|
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
|
|
tf.command = ATA_CMD_PACKET;
|
|
|
|
/* is it pointless to prefer PIO for "safety reasons"? */
|
|
if (ap->flags & ATA_FLAG_PIO_DMA) {
|
|
tf.protocol = ATA_PROT_ATAPI_DMA;
|
|
tf.feature |= ATAPI_PKT_DMA;
|
|
} else {
|
|
tf.protocol = ATA_PROT_ATAPI;
|
|
tf.lbam = (8 * 1024) & 0xff;
|
|
tf.lbah = (8 * 1024) >> 8;
|
|
}
|
|
|
|
return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
|
|
sense_buf, SCSI_SENSE_BUFFERSIZE);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_analyze_serror - analyze SError for a failed port
|
|
* @ap: ATA port to analyze SError for
|
|
*
|
|
* Analyze SError if available and further determine cause of
|
|
* failure.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_analyze_serror(struct ata_port *ap)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
u32 serror = ehc->i.serror;
|
|
unsigned int err_mask = 0, action = 0;
|
|
|
|
if (serror & SERR_PERSISTENT) {
|
|
err_mask |= AC_ERR_ATA_BUS;
|
|
action |= ATA_EH_HARDRESET;
|
|
}
|
|
if (serror &
|
|
(SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) {
|
|
err_mask |= AC_ERR_ATA_BUS;
|
|
action |= ATA_EH_SOFTRESET;
|
|
}
|
|
if (serror & SERR_PROTOCOL) {
|
|
err_mask |= AC_ERR_HSM;
|
|
action |= ATA_EH_SOFTRESET;
|
|
}
|
|
if (serror & SERR_INTERNAL) {
|
|
err_mask |= AC_ERR_SYSTEM;
|
|
action |= ATA_EH_SOFTRESET;
|
|
}
|
|
if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
|
|
ata_ehi_hotplugged(&ehc->i);
|
|
|
|
ehc->i.err_mask |= err_mask;
|
|
ehc->i.action |= action;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_analyze_ncq_error - analyze NCQ error
|
|
* @ap: ATA port to analyze NCQ error for
|
|
*
|
|
* Read log page 10h, determine the offending qc and acquire
|
|
* error status TF. For NCQ device errors, all LLDDs have to do
|
|
* is setting AC_ERR_DEV in ehi->err_mask. This function takes
|
|
* care of the rest.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
static void ata_eh_analyze_ncq_error(struct ata_port *ap)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
struct ata_device *dev = ap->device;
|
|
struct ata_queued_cmd *qc;
|
|
struct ata_taskfile tf;
|
|
int tag, rc;
|
|
|
|
/* if frozen, we can't do much */
|
|
if (ap->flags & ATA_FLAG_FROZEN)
|
|
return;
|
|
|
|
/* is it NCQ device error? */
|
|
if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
|
|
return;
|
|
|
|
/* has LLDD analyzed already? */
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
qc = __ata_qc_from_tag(ap, tag);
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED))
|
|
continue;
|
|
|
|
if (qc->err_mask)
|
|
return;
|
|
}
|
|
|
|
/* okay, this error is ours */
|
|
rc = ata_eh_read_log_10h(dev, &tag, &tf);
|
|
if (rc) {
|
|
ata_port_printk(ap, KERN_ERR, "failed to read log page 10h "
|
|
"(errno=%d)\n", rc);
|
|
return;
|
|
}
|
|
|
|
if (!(ap->sactive & (1 << tag))) {
|
|
ata_port_printk(ap, KERN_ERR, "log page 10h reported "
|
|
"inactive tag %d\n", tag);
|
|
return;
|
|
}
|
|
|
|
/* we've got the perpetrator, condemn it */
|
|
qc = __ata_qc_from_tag(ap, tag);
|
|
memcpy(&qc->result_tf, &tf, sizeof(tf));
|
|
qc->err_mask |= AC_ERR_DEV;
|
|
ehc->i.err_mask &= ~AC_ERR_DEV;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_analyze_tf - analyze taskfile of a failed qc
|
|
* @qc: qc to analyze
|
|
* @tf: Taskfile registers to analyze
|
|
*
|
|
* Analyze taskfile of @qc and further determine cause of
|
|
* failure. This function also requests ATAPI sense data if
|
|
* avaliable.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* Determined recovery action
|
|
*/
|
|
static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
|
|
const struct ata_taskfile *tf)
|
|
{
|
|
unsigned int tmp, action = 0;
|
|
u8 stat = tf->command, err = tf->feature;
|
|
|
|
if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
|
|
qc->err_mask |= AC_ERR_HSM;
|
|
return ATA_EH_SOFTRESET;
|
|
}
|
|
|
|
if (!(qc->err_mask & AC_ERR_DEV))
|
|
return 0;
|
|
|
|
switch (qc->dev->class) {
|
|
case ATA_DEV_ATA:
|
|
if (err & ATA_ICRC)
|
|
qc->err_mask |= AC_ERR_ATA_BUS;
|
|
if (err & ATA_UNC)
|
|
qc->err_mask |= AC_ERR_MEDIA;
|
|
if (err & ATA_IDNF)
|
|
qc->err_mask |= AC_ERR_INVALID;
|
|
break;
|
|
|
|
case ATA_DEV_ATAPI:
|
|
tmp = atapi_eh_request_sense(qc->dev,
|
|
qc->scsicmd->sense_buffer);
|
|
if (!tmp) {
|
|
/* ATA_QCFLAG_SENSE_VALID is used to tell
|
|
* atapi_qc_complete() that sense data is
|
|
* already valid.
|
|
*
|
|
* TODO: interpret sense data and set
|
|
* appropriate err_mask.
|
|
*/
|
|
qc->flags |= ATA_QCFLAG_SENSE_VALID;
|
|
} else
|
|
qc->err_mask |= tmp;
|
|
}
|
|
|
|
if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
|
|
action |= ATA_EH_SOFTRESET;
|
|
|
|
return action;
|
|
}
|
|
|
|
static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent)
|
|
{
|
|
if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT))
|
|
return 1;
|
|
|
|
if (ent->is_io) {
|
|
if (ent->err_mask & AC_ERR_HSM)
|
|
return 1;
|
|
if ((ent->err_mask &
|
|
(AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
|
|
return 2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct speed_down_needed_arg {
|
|
u64 since;
|
|
int nr_errors[3];
|
|
};
|
|
|
|
static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg)
|
|
{
|
|
struct speed_down_needed_arg *arg = void_arg;
|
|
|
|
if (ent->timestamp < arg->since)
|
|
return -1;
|
|
|
|
arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_speed_down_needed - Determine wheter speed down is necessary
|
|
* @dev: Device of interest
|
|
*
|
|
* This function examines error ring of @dev and determines
|
|
* whether speed down is necessary. Speed down is necessary if
|
|
* there have been more than 3 of Cat-1 errors or 10 of Cat-2
|
|
* errors during last 15 minutes.
|
|
*
|
|
* Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM
|
|
* violation for known supported commands.
|
|
*
|
|
* Cat-2 errors are unclassified DEV error for known supported
|
|
* command.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from caller.
|
|
*
|
|
* RETURNS:
|
|
* 1 if speed down is necessary, 0 otherwise
|
|
*/
|
|
static int ata_eh_speed_down_needed(struct ata_device *dev)
|
|
{
|
|
const u64 interval = 15LLU * 60 * HZ;
|
|
static const int err_limits[3] = { -1, 3, 10 };
|
|
struct speed_down_needed_arg arg;
|
|
struct ata_ering_entry *ent;
|
|
int err_cat;
|
|
u64 j64;
|
|
|
|
ent = ata_ering_top(&dev->ering);
|
|
if (!ent)
|
|
return 0;
|
|
|
|
err_cat = ata_eh_categorize_ering_entry(ent);
|
|
if (err_cat == 0)
|
|
return 0;
|
|
|
|
memset(&arg, 0, sizeof(arg));
|
|
|
|
j64 = get_jiffies_64();
|
|
if (j64 >= interval)
|
|
arg.since = j64 - interval;
|
|
else
|
|
arg.since = 0;
|
|
|
|
ata_ering_map(&dev->ering, speed_down_needed_cb, &arg);
|
|
|
|
return arg.nr_errors[err_cat] > err_limits[err_cat];
|
|
}
|
|
|
|
/**
|
|
* ata_eh_speed_down - record error and speed down if necessary
|
|
* @dev: Failed device
|
|
* @is_io: Did the device fail during normal IO?
|
|
* @err_mask: err_mask of the error
|
|
*
|
|
* Record error and examine error history to determine whether
|
|
* adjusting transmission speed is necessary. It also sets
|
|
* transmission limits appropriately if such adjustment is
|
|
* necessary.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, -errno otherwise
|
|
*/
|
|
static int ata_eh_speed_down(struct ata_device *dev, int is_io,
|
|
unsigned int err_mask)
|
|
{
|
|
if (!err_mask)
|
|
return 0;
|
|
|
|
/* record error and determine whether speed down is necessary */
|
|
ata_ering_record(&dev->ering, is_io, err_mask);
|
|
|
|
if (!ata_eh_speed_down_needed(dev))
|
|
return 0;
|
|
|
|
/* speed down SATA link speed if possible */
|
|
if (sata_down_spd_limit(dev->ap) == 0)
|
|
return ATA_EH_HARDRESET;
|
|
|
|
/* lower transfer mode */
|
|
if (ata_down_xfermask_limit(dev, 0) == 0)
|
|
return ATA_EH_SOFTRESET;
|
|
|
|
ata_dev_printk(dev, KERN_ERR,
|
|
"speed down requested but no transfer mode left\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_autopsy - analyze error and determine recovery action
|
|
* @ap: ATA port to perform autopsy on
|
|
*
|
|
* Analyze why @ap failed and determine which recovery action is
|
|
* needed. This function also sets more detailed AC_ERR_* values
|
|
* and fills sense data for ATAPI CHECK SENSE.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
static void ata_eh_autopsy(struct ata_port *ap)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
unsigned int action = ehc->i.action;
|
|
struct ata_device *failed_dev = NULL;
|
|
unsigned int all_err_mask = 0;
|
|
int tag, is_io = 0;
|
|
u32 serror;
|
|
int rc;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
/* obtain and analyze SError */
|
|
rc = sata_scr_read(ap, SCR_ERROR, &serror);
|
|
if (rc == 0) {
|
|
ehc->i.serror |= serror;
|
|
ata_eh_analyze_serror(ap);
|
|
} else if (rc != -EOPNOTSUPP)
|
|
action |= ATA_EH_HARDRESET;
|
|
|
|
/* analyze NCQ failure */
|
|
ata_eh_analyze_ncq_error(ap);
|
|
|
|
/* any real error trumps AC_ERR_OTHER */
|
|
if (ehc->i.err_mask & ~AC_ERR_OTHER)
|
|
ehc->i.err_mask &= ~AC_ERR_OTHER;
|
|
|
|
all_err_mask |= ehc->i.err_mask;
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED))
|
|
continue;
|
|
|
|
/* inherit upper level err_mask */
|
|
qc->err_mask |= ehc->i.err_mask;
|
|
|
|
/* analyze TF */
|
|
action |= ata_eh_analyze_tf(qc, &qc->result_tf);
|
|
|
|
/* DEV errors are probably spurious in case of ATA_BUS error */
|
|
if (qc->err_mask & AC_ERR_ATA_BUS)
|
|
qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
|
|
AC_ERR_INVALID);
|
|
|
|
/* any real error trumps unknown error */
|
|
if (qc->err_mask & ~AC_ERR_OTHER)
|
|
qc->err_mask &= ~AC_ERR_OTHER;
|
|
|
|
/* SENSE_VALID trumps dev/unknown error and revalidation */
|
|
if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
|
|
qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
|
|
action &= ~ATA_EH_REVALIDATE;
|
|
}
|
|
|
|
/* accumulate error info */
|
|
failed_dev = qc->dev;
|
|
all_err_mask |= qc->err_mask;
|
|
if (qc->flags & ATA_QCFLAG_IO)
|
|
is_io = 1;
|
|
}
|
|
|
|
/* enforce default EH actions */
|
|
if (ap->flags & ATA_FLAG_FROZEN ||
|
|
all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
|
|
action |= ATA_EH_SOFTRESET;
|
|
else if (all_err_mask)
|
|
action |= ATA_EH_REVALIDATE;
|
|
|
|
/* if we have offending qcs and the associated failed device */
|
|
if (failed_dev) {
|
|
/* speed down */
|
|
action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask);
|
|
|
|
/* perform per-dev EH action only on the offending device */
|
|
ehc->i.dev_action[failed_dev->devno] |=
|
|
action & ATA_EH_PERDEV_MASK;
|
|
action &= ~ATA_EH_PERDEV_MASK;
|
|
}
|
|
|
|
/* record autopsy result */
|
|
ehc->i.dev = failed_dev;
|
|
ehc->i.action = action;
|
|
|
|
DPRINTK("EXIT\n");
|
|
}
|
|
|
|
/**
|
|
* ata_eh_report - report error handling to user
|
|
* @ap: ATA port EH is going on
|
|
*
|
|
* Report EH to user.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_report(struct ata_port *ap)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
const char *frozen, *desc;
|
|
int tag, nr_failed = 0;
|
|
|
|
desc = NULL;
|
|
if (ehc->i.desc[0] != '\0')
|
|
desc = ehc->i.desc;
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED))
|
|
continue;
|
|
if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
|
|
continue;
|
|
|
|
nr_failed++;
|
|
}
|
|
|
|
if (!nr_failed && !ehc->i.err_mask)
|
|
return;
|
|
|
|
frozen = "";
|
|
if (ap->flags & ATA_FLAG_FROZEN)
|
|
frozen = " frozen";
|
|
|
|
if (ehc->i.dev) {
|
|
ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
|
|
"SAct 0x%x SErr 0x%x action 0x%x%s\n",
|
|
ehc->i.err_mask, ap->sactive, ehc->i.serror,
|
|
ehc->i.action, frozen);
|
|
if (desc)
|
|
ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc);
|
|
} else {
|
|
ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x "
|
|
"SAct 0x%x SErr 0x%x action 0x%x%s\n",
|
|
ehc->i.err_mask, ap->sactive, ehc->i.serror,
|
|
ehc->i.action, frozen);
|
|
if (desc)
|
|
ata_port_printk(ap, KERN_ERR, "(%s)\n", desc);
|
|
}
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
|
|
continue;
|
|
|
|
ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x "
|
|
"Emask 0x%x stat 0x%x err 0x%x (%s)\n",
|
|
qc->tag, qc->tf.command, qc->err_mask,
|
|
qc->result_tf.command, qc->result_tf.feature,
|
|
ata_err_string(qc->err_mask));
|
|
}
|
|
}
|
|
|
|
static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
|
|
unsigned int *classes)
|
|
{
|
|
int i, rc;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
classes[i] = ATA_DEV_UNKNOWN;
|
|
|
|
rc = reset(ap, classes);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* If any class isn't ATA_DEV_UNKNOWN, consider classification
|
|
* is complete and convert all ATA_DEV_UNKNOWN to
|
|
* ATA_DEV_NONE.
|
|
*/
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
if (classes[i] != ATA_DEV_UNKNOWN)
|
|
break;
|
|
|
|
if (i < ATA_MAX_DEVICES)
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
if (classes[i] == ATA_DEV_UNKNOWN)
|
|
classes[i] = ATA_DEV_NONE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ata_eh_followup_srst_needed(int rc, int classify,
|
|
const unsigned int *classes)
|
|
{
|
|
if (rc == -EAGAIN)
|
|
return 1;
|
|
if (rc != 0)
|
|
return 0;
|
|
if (classify && classes[0] == ATA_DEV_UNKNOWN)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int ata_eh_reset(struct ata_port *ap, int classify,
|
|
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
|
|
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
unsigned int *classes = ehc->classes;
|
|
int tries = ATA_EH_RESET_TRIES;
|
|
int verbose = !(ap->flags & ATA_FLAG_LOADING);
|
|
unsigned int action;
|
|
ata_reset_fn_t reset;
|
|
int i, did_followup_srst, rc;
|
|
|
|
/* Determine which reset to use and record in ehc->i.action.
|
|
* prereset() may examine and modify it.
|
|
*/
|
|
action = ehc->i.action;
|
|
ehc->i.action &= ~ATA_EH_RESET_MASK;
|
|
if (softreset && (!hardreset || (!sata_set_spd_needed(ap) &&
|
|
!(action & ATA_EH_HARDRESET))))
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
else
|
|
ehc->i.action |= ATA_EH_HARDRESET;
|
|
|
|
if (prereset) {
|
|
rc = prereset(ap);
|
|
if (rc) {
|
|
ata_port_printk(ap, KERN_ERR,
|
|
"prereset failed (errno=%d)\n", rc);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* prereset() might have modified ehc->i.action */
|
|
if (ehc->i.action & ATA_EH_HARDRESET)
|
|
reset = hardreset;
|
|
else if (ehc->i.action & ATA_EH_SOFTRESET)
|
|
reset = softreset;
|
|
else {
|
|
/* prereset told us not to reset, bang classes and return */
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
classes[i] = ATA_DEV_NONE;
|
|
return 0;
|
|
}
|
|
|
|
/* did prereset() screw up? if so, fix up to avoid oopsing */
|
|
if (!reset) {
|
|
ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested "
|
|
"invalid reset type\n");
|
|
if (softreset)
|
|
reset = softreset;
|
|
else
|
|
reset = hardreset;
|
|
}
|
|
|
|
retry:
|
|
/* shut up during boot probing */
|
|
if (verbose)
|
|
ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
|
|
reset == softreset ? "soft" : "hard");
|
|
|
|
/* reset */
|
|
ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
|
|
ehc->i.flags |= ATA_EHI_DID_RESET;
|
|
|
|
rc = ata_do_reset(ap, reset, classes);
|
|
|
|
did_followup_srst = 0;
|
|
if (reset == hardreset &&
|
|
ata_eh_followup_srst_needed(rc, classify, classes)) {
|
|
/* okay, let's do follow-up softreset */
|
|
did_followup_srst = 1;
|
|
reset = softreset;
|
|
|
|
if (!reset) {
|
|
ata_port_printk(ap, KERN_ERR,
|
|
"follow-up softreset required "
|
|
"but no softreset avaliable\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
|
|
rc = ata_do_reset(ap, reset, classes);
|
|
|
|
if (rc == 0 && classify &&
|
|
classes[0] == ATA_DEV_UNKNOWN) {
|
|
ata_port_printk(ap, KERN_ERR,
|
|
"classification failed\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (rc && --tries) {
|
|
const char *type;
|
|
|
|
if (reset == softreset) {
|
|
if (did_followup_srst)
|
|
type = "follow-up soft";
|
|
else
|
|
type = "soft";
|
|
} else
|
|
type = "hard";
|
|
|
|
ata_port_printk(ap, KERN_WARNING,
|
|
"%sreset failed, retrying in 5 secs\n", type);
|
|
ssleep(5);
|
|
|
|
if (reset == hardreset)
|
|
sata_down_spd_limit(ap);
|
|
if (hardreset)
|
|
reset = hardreset;
|
|
goto retry;
|
|
}
|
|
|
|
if (rc == 0) {
|
|
/* After the reset, the device state is PIO 0 and the
|
|
* controller state is undefined. Record the mode.
|
|
*/
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
ap->device[i].pio_mode = XFER_PIO_0;
|
|
|
|
if (postreset)
|
|
postreset(ap, classes);
|
|
|
|
/* reset successful, schedule revalidation */
|
|
ata_eh_done(ap, NULL, ATA_EH_RESET_MASK);
|
|
ehc->i.action |= ATA_EH_REVALIDATE;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int ata_eh_revalidate_and_attach(struct ata_port *ap,
|
|
struct ata_device **r_failed_dev)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
struct ata_device *dev;
|
|
unsigned long flags;
|
|
int i, rc = 0;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++) {
|
|
unsigned int action;
|
|
|
|
dev = &ap->device[i];
|
|
action = ehc->i.action | ehc->i.dev_action[dev->devno];
|
|
|
|
if (action & ATA_EH_REVALIDATE && ata_dev_enabled(dev)) {
|
|
if (ata_port_offline(ap)) {
|
|
rc = -EIO;
|
|
break;
|
|
}
|
|
|
|
ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
|
|
rc = ata_dev_revalidate(dev,
|
|
ehc->i.flags & ATA_EHI_DID_RESET);
|
|
if (rc)
|
|
break;
|
|
|
|
ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
|
|
|
|
/* schedule the scsi_rescan_device() here */
|
|
queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
|
|
} else if (dev->class == ATA_DEV_UNKNOWN &&
|
|
ehc->tries[dev->devno] &&
|
|
ata_class_enabled(ehc->classes[dev->devno])) {
|
|
dev->class = ehc->classes[dev->devno];
|
|
|
|
rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
|
|
if (rc == 0)
|
|
rc = ata_dev_configure(dev, 1);
|
|
|
|
if (rc) {
|
|
dev->class = ATA_DEV_UNKNOWN;
|
|
break;
|
|
}
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ap->flags |= ATA_FLAG_SCSI_HOTPLUG;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
}
|
|
|
|
if (rc)
|
|
*r_failed_dev = dev;
|
|
|
|
DPRINTK("EXIT\n");
|
|
return rc;
|
|
}
|
|
|
|
static int ata_port_nr_enabled(struct ata_port *ap)
|
|
{
|
|
int i, cnt = 0;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
if (ata_dev_enabled(&ap->device[i]))
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
static int ata_port_nr_vacant(struct ata_port *ap)
|
|
{
|
|
int i, cnt = 0;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
if (ap->device[i].class == ATA_DEV_UNKNOWN)
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
static int ata_eh_skip_recovery(struct ata_port *ap)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
int i;
|
|
|
|
if (ap->flags & ATA_FLAG_FROZEN || ata_port_nr_enabled(ap))
|
|
return 0;
|
|
|
|
/* skip if class codes for all vacant slots are ATA_DEV_NONE */
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++) {
|
|
struct ata_device *dev = &ap->device[i];
|
|
|
|
if (dev->class == ATA_DEV_UNKNOWN &&
|
|
ehc->classes[dev->devno] != ATA_DEV_NONE)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_recover - recover host port after error
|
|
* @ap: host port to recover
|
|
* @prereset: prereset method (can be NULL)
|
|
* @softreset: softreset method (can be NULL)
|
|
* @hardreset: hardreset method (can be NULL)
|
|
* @postreset: postreset method (can be NULL)
|
|
*
|
|
* This is the alpha and omega, eum and yang, heart and soul of
|
|
* libata exception handling. On entry, actions required to
|
|
* recover the port and hotplug requests are recorded in
|
|
* eh_context. This function executes all the operations with
|
|
* appropriate retrials and fallbacks to resurrect failed
|
|
* devices, detach goners and greet newcomers.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, -errno on failure.
|
|
*/
|
|
static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
|
|
ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
|
|
ata_postreset_fn_t postreset)
|
|
{
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
struct ata_device *dev;
|
|
int down_xfermask, i, rc;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
/* prep for recovery */
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++) {
|
|
dev = &ap->device[i];
|
|
|
|
ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
|
|
|
|
/* process hotplug request */
|
|
if (dev->flags & ATA_DFLAG_DETACH)
|
|
ata_eh_detach_dev(dev);
|
|
|
|
if (!ata_dev_enabled(dev) &&
|
|
((ehc->i.probe_mask & (1 << dev->devno)) &&
|
|
!(ehc->did_probe_mask & (1 << dev->devno)))) {
|
|
ata_eh_detach_dev(dev);
|
|
ata_dev_init(dev);
|
|
ehc->did_probe_mask |= (1 << dev->devno);
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
}
|
|
}
|
|
|
|
retry:
|
|
down_xfermask = 0;
|
|
rc = 0;
|
|
|
|
/* if UNLOADING, finish immediately */
|
|
if (ap->flags & ATA_FLAG_UNLOADING)
|
|
goto out;
|
|
|
|
/* skip EH if possible. */
|
|
if (ata_eh_skip_recovery(ap))
|
|
ehc->i.action = 0;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
ehc->classes[i] = ATA_DEV_UNKNOWN;
|
|
|
|
/* reset */
|
|
if (ehc->i.action & ATA_EH_RESET_MASK) {
|
|
ata_eh_freeze_port(ap);
|
|
|
|
rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset,
|
|
softreset, hardreset, postreset);
|
|
if (rc) {
|
|
ata_port_printk(ap, KERN_ERR,
|
|
"reset failed, giving up\n");
|
|
goto out;
|
|
}
|
|
|
|
ata_eh_thaw_port(ap);
|
|
}
|
|
|
|
/* revalidate existing devices and attach new ones */
|
|
rc = ata_eh_revalidate_and_attach(ap, &dev);
|
|
if (rc)
|
|
goto dev_fail;
|
|
|
|
/* configure transfer mode if the port has been reset */
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET) {
|
|
rc = ata_set_mode(ap, &dev);
|
|
if (rc) {
|
|
down_xfermask = 1;
|
|
goto dev_fail;
|
|
}
|
|
}
|
|
|
|
goto out;
|
|
|
|
dev_fail:
|
|
switch (rc) {
|
|
case -ENODEV:
|
|
/* device missing, schedule probing */
|
|
ehc->i.probe_mask |= (1 << dev->devno);
|
|
case -EINVAL:
|
|
ehc->tries[dev->devno] = 0;
|
|
break;
|
|
case -EIO:
|
|
sata_down_spd_limit(ap);
|
|
default:
|
|
ehc->tries[dev->devno]--;
|
|
if (down_xfermask &&
|
|
ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1))
|
|
ehc->tries[dev->devno] = 0;
|
|
}
|
|
|
|
if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
|
|
/* disable device if it has used up all its chances */
|
|
ata_dev_disable(dev);
|
|
|
|
/* detach if offline */
|
|
if (ata_port_offline(ap))
|
|
ata_eh_detach_dev(dev);
|
|
|
|
/* probe if requested */
|
|
if ((ehc->i.probe_mask & (1 << dev->devno)) &&
|
|
!(ehc->did_probe_mask & (1 << dev->devno))) {
|
|
ata_eh_detach_dev(dev);
|
|
ata_dev_init(dev);
|
|
|
|
ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
|
|
ehc->did_probe_mask |= (1 << dev->devno);
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
}
|
|
} else {
|
|
/* soft didn't work? be haaaaard */
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET)
|
|
ehc->i.action |= ATA_EH_HARDRESET;
|
|
else
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
}
|
|
|
|
if (ata_port_nr_enabled(ap)) {
|
|
ata_port_printk(ap, KERN_WARNING, "failed to recover some "
|
|
"devices, retrying in 5 secs\n");
|
|
ssleep(5);
|
|
} else {
|
|
/* no device left, repeat fast */
|
|
msleep(500);
|
|
}
|
|
|
|
goto retry;
|
|
|
|
out:
|
|
if (rc) {
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
ata_dev_disable(&ap->device[i]);
|
|
}
|
|
|
|
DPRINTK("EXIT, rc=%d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_finish - finish up EH
|
|
* @ap: host port to finish EH for
|
|
*
|
|
* Recovery is complete. Clean up EH states and retry or finish
|
|
* failed qcs.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_finish(struct ata_port *ap)
|
|
{
|
|
int tag;
|
|
|
|
/* retry or finish qcs */
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED))
|
|
continue;
|
|
|
|
if (qc->err_mask) {
|
|
/* FIXME: Once EH migration is complete,
|
|
* generate sense data in this function,
|
|
* considering both err_mask and tf.
|
|
*/
|
|
if (qc->err_mask & AC_ERR_INVALID)
|
|
ata_eh_qc_complete(qc);
|
|
else
|
|
ata_eh_qc_retry(qc);
|
|
} else {
|
|
if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
|
|
ata_eh_qc_complete(qc);
|
|
} else {
|
|
/* feed zero TF to sense generation */
|
|
memset(&qc->result_tf, 0, sizeof(qc->result_tf));
|
|
ata_eh_qc_retry(qc);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ata_do_eh - do standard error handling
|
|
* @ap: host port to handle error for
|
|
* @prereset: prereset method (can be NULL)
|
|
* @softreset: softreset method (can be NULL)
|
|
* @hardreset: hardreset method (can be NULL)
|
|
* @postreset: postreset method (can be NULL)
|
|
*
|
|
* Perform standard error handling sequence.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
|
|
ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
|
|
ata_postreset_fn_t postreset)
|
|
{
|
|
if (!(ap->flags & ATA_FLAG_LOADING)) {
|
|
ata_eh_autopsy(ap);
|
|
ata_eh_report(ap);
|
|
}
|
|
|
|
ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
|
|
ata_eh_finish(ap);
|
|
}
|