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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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914616a3c2
When EH gives up after repeated exceptions, it doesn't't clear the PENDING bit on exit which leaves PENDING bit set without EH actually scheduled. This makes ata_port_wait_eh() to wait forever makes rmmod hang on such port. Fix it by clearing the flag. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
2220 lines
54 KiB
C
2220 lines
54 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/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/scsi_transport_api.h"
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#include <linux/libata.h>
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#include "libata.h"
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enum {
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ATA_EH_SPDN_NCQ_OFF = (1 << 0),
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ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
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ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
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};
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/* Waiting in ->prereset can never be reliable. It's sometimes nice
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* to wait there but it can't be depended upon; otherwise, we wouldn't
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* be resetting. Just give it enough time for most drives to spin up.
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*/
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enum {
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ATA_EH_PRERESET_TIMEOUT = 10 * HZ,
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};
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/* The following table determines how we sequence resets. Each entry
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* represents timeout for that try. The first try can be soft or
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* hardreset. All others are hardreset if available. In most cases
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* the first reset w/ 10sec timeout should succeed. Following entries
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* are mostly for error handling, hotplug and retarded devices.
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*/
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static const unsigned long ata_eh_reset_timeouts[] = {
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10 * HZ, /* most drives spin up by 10sec */
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10 * HZ, /* > 99% working drives spin up before 20sec */
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35 * HZ, /* give > 30 secs of idleness for retarded devices */
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5 * HZ, /* and sweet one last chance */
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/* > 1 min has elapsed, give up */
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};
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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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#ifdef CONFIG_PM
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static void ata_eh_handle_port_suspend(struct ata_port *ap);
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static void ata_eh_handle_port_resume(struct ata_port *ap);
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#else /* CONFIG_PM */
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static void ata_eh_handle_port_suspend(struct ata_port *ap)
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{ }
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static void ata_eh_handle_port_resume(struct ata_port *ap)
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{ }
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#endif /* CONFIG_PM */
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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 void ata_ering_clear(struct ata_ering *ering)
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{
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memset(ering, 0, sizeof(*ering));
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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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static unsigned int ata_eh_dev_action(struct ata_device *dev)
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{
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struct ata_eh_context *ehc = &dev->ap->eh_context;
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return ehc->i.action | ehc->i.dev_action[dev->devno];
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}
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static void ata_eh_clear_action(struct ata_device *dev,
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struct ata_eh_info *ehi, unsigned int action)
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{
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int i;
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if (!dev) {
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ehi->action &= ~action;
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for (i = 0; i < ATA_MAX_DEVICES; i++)
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ehi->dev_action[i] &= ~action;
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} else {
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/* doesn't make sense for port-wide EH actions */
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WARN_ON(!(action & ATA_EH_PERDEV_MASK));
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/* break ehi->action into ehi->dev_action */
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if (ehi->action & action) {
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for (i = 0; i < ATA_MAX_DEVICES; i++)
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ehi->dev_action[i] |= ehi->action & action;
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ehi->action &= ~action;
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}
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/* turn off the specified per-dev action */
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ehi->dev_action[dev->devno] &= ~action;
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}
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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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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 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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/* process port resume request */
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ata_eh_handle_port_resume(ap);
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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->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
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ap->pflags &= ~ATA_PFLAG_EH_PENDING;
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spin_unlock_irqrestore(ap->lock, flags);
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/* invoke EH, skip if unloading or suspended */
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if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
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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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/* process port suspend request */
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ata_eh_handle_port_suspend(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->pflags & ATA_PFLAG_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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ap->pflags &= ~ATA_PFLAG_EH_PENDING;
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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->pflags & ATA_PFLAG_LOADING)
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ap->pflags &= ~ATA_PFLAG_LOADING;
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else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
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queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0);
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if (ap->pflags & ATA_PFLAG_RECOVERED)
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ata_port_printk(ap, KERN_INFO, "EH complete\n");
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ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
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/* tell wait_eh that we're done */
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ap->pflags &= ~ATA_PFLAG_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->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_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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|
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spin_unlock_irqrestore(ap->lock, flags);
|
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|
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/* make sure SCSI EH is complete */
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if (scsi_host_in_recovery(ap->scsi_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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* ata_qc_timeout - Handle timeout of queued command
|
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* @qc: Command that timed out
|
|
*
|
|
* Some part of the kernel (currently, only the SCSI layer)
|
|
* 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.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from SCSI layer (none, can sleep)
|
|
*/
|
|
static void ata_qc_timeout(struct ata_queued_cmd *qc)
|
|
{
|
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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);
|
|
|
|
switch (qc->tf.protocol) {
|
|
|
|
case ATA_PROT_DMA:
|
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case ATA_PROT_ATAPI_DMA:
|
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host_stat = ap->ops->bmdma_status(ap);
|
|
|
|
/* before we do anything else, clear DMA-Start bit */
|
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ap->ops->bmdma_stop(qc);
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|
|
|
/* fall through */
|
|
|
|
default:
|
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ata_altstatus(ap);
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drv_stat = ata_chk_status(ap);
|
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|
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/* ack bmdma irq events */
|
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ap->ops->irq_clear(ap);
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|
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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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|
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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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|
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spin_unlock_irqrestore(ap->lock, flags);
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|
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ata_eh_qc_complete(qc);
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|
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DPRINTK("EXIT\n");
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}
|
|
|
|
/**
|
|
* ata_eng_timeout - Handle timeout of queued command
|
|
* @ap: Port on which timed-out command is active
|
|
*
|
|
* Some part of the kernel (currently, only the SCSI layer)
|
|
* 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.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from SCSI layer (none, can sleep)
|
|
*/
|
|
void ata_eng_timeout(struct ata_port *ap)
|
|
{
|
|
DPRINTK("ENTER\n");
|
|
|
|
ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
|
|
|
|
DPRINTK("EXIT\n");
|
|
}
|
|
|
|
/**
|
|
* ata_qc_schedule_eh - schedule qc for error handling
|
|
* @qc: command to schedule error handling for
|
|
*
|
|
* Schedule error handling for @qc. EH will kick in as soon as
|
|
* other commands are drained.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host lock)
|
|
*/
|
|
void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
|
|
{
|
|
struct ata_port *ap = qc->ap;
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
qc->flags |= ATA_QCFLAG_FAILED;
|
|
qc->ap->pflags |= ATA_PFLAG_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);
|
|
}
|
|
|
|
/**
|
|
* 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 lock)
|
|
*/
|
|
void ata_port_schedule_eh(struct ata_port *ap)
|
|
{
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
if (ap->pflags & ATA_PFLAG_INITIALIZING)
|
|
return;
|
|
|
|
ap->pflags |= ATA_PFLAG_EH_PENDING;
|
|
scsi_schedule_eh(ap->scsi_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 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;
|
|
}
|
|
|
|
/**
|
|
* __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 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->pflags |= ATA_PFLAG_FROZEN;
|
|
|
|
DPRINTK("ata%u port frozen\n", ap->print_id);
|
|
}
|
|
|
|
/**
|
|
* ata_port_freeze - abort & freeze port
|
|
* @ap: ATA port to freeze
|
|
*
|
|
* Abort and freeze @ap.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host 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->pflags &= ~ATA_PFLAG_FROZEN;
|
|
|
|
if (ap->ops->thaw)
|
|
ap->ops->thaw(ap);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
DPRINTK("ata%u port thawed\n", ap->print_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->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
|
|
}
|
|
|
|
/* clear per-dev EH actions */
|
|
ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK);
|
|
ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
struct ata_eh_info *ehi = &ap->eh_info;
|
|
struct ata_eh_context *ehc = &ap->eh_context;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
/* Reset is represented by combination of actions and EHI
|
|
* flags. Suck in all related bits before clearing eh_info to
|
|
* avoid losing requested action.
|
|
*/
|
|
if (action & ATA_EH_RESET_MASK) {
|
|
ehc->i.action |= ehi->action & ATA_EH_RESET_MASK;
|
|
ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK;
|
|
|
|
/* make sure all reset actions are cleared & clear EHI flags */
|
|
action |= ATA_EH_RESET_MASK;
|
|
ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
|
|
}
|
|
|
|
ata_eh_clear_action(dev, ehi, action);
|
|
|
|
if (!(ehc->i.flags & ATA_EHI_QUIET))
|
|
ap->pflags |= ATA_PFLAG_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)
|
|
{
|
|
/* if reset is complete, clear all reset actions & reset modifier */
|
|
if (action & ATA_EH_RESET_MASK) {
|
|
action |= ATA_EH_RESET_MASK;
|
|
ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
|
|
}
|
|
|
|
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_queued_cmd *qc)
|
|
{
|
|
struct ata_device *dev = qc->dev;
|
|
unsigned char *sense_buf = qc->scsicmd->sense_buffer;
|
|
struct ata_port *ap = dev->ap;
|
|
struct ata_taskfile tf;
|
|
u8 cdb[ATAPI_CDB_LEN];
|
|
|
|
DPRINTK("ATAPI request sense\n");
|
|
|
|
/* FIXME: is this needed? */
|
|
memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
|
|
|
|
/* initialize sense_buf with the error register,
|
|
* for the case where they are -not- overwritten
|
|
*/
|
|
sense_buf[0] = 0x70;
|
|
sense_buf[2] = qc->result_tf.feature >> 4;
|
|
|
|
/* some devices time out if garbage left in tf */
|
|
ata_tf_init(dev, &tf);
|
|
|
|
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_HARDRESET;
|
|
}
|
|
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->pflags & ATA_PFLAG_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 (stat & (ATA_ERR | ATA_DF))
|
|
qc->err_mask |= AC_ERR_DEV;
|
|
else
|
|
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:
|
|
if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
|
|
tmp = atapi_eh_request_sense(qc);
|
|
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_error(int is_io, unsigned int err_mask)
|
|
{
|
|
if (err_mask & AC_ERR_ATA_BUS)
|
|
return 1;
|
|
|
|
if (err_mask & AC_ERR_TIMEOUT)
|
|
return 2;
|
|
|
|
if (is_io) {
|
|
if (err_mask & AC_ERR_HSM)
|
|
return 2;
|
|
if ((err_mask &
|
|
(AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
|
|
return 3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct speed_down_verdict_arg {
|
|
u64 since;
|
|
int nr_errors[4];
|
|
};
|
|
|
|
static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
|
|
{
|
|
struct speed_down_verdict_arg *arg = void_arg;
|
|
int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask);
|
|
|
|
if (ent->timestamp < arg->since)
|
|
return -1;
|
|
|
|
arg->nr_errors[cat]++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_speed_down_verdict - Determine speed down verdict
|
|
* @dev: Device of interest
|
|
*
|
|
* This function examines error ring of @dev and determines
|
|
* whether NCQ needs to be turned off, transfer speed should be
|
|
* stepped down, or falling back to PIO is necessary.
|
|
*
|
|
* Cat-1 is ATA_BUS error for any command.
|
|
*
|
|
* Cat-2 is TIMEOUT for any command or HSM violation for known
|
|
* supported commands.
|
|
*
|
|
* Cat-3 is is unclassified DEV error for known supported
|
|
* command.
|
|
*
|
|
* NCQ needs to be turned off if there have been more than 3
|
|
* Cat-2 + Cat-3 errors during last 10 minutes.
|
|
*
|
|
* Speed down is necessary if there have been more than 3 Cat-1 +
|
|
* Cat-2 errors or 10 Cat-3 errors during last 10 minutes.
|
|
*
|
|
* Falling back to PIO mode is necessary if there have been more
|
|
* than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from caller.
|
|
*
|
|
* RETURNS:
|
|
* OR of ATA_EH_SPDN_* flags.
|
|
*/
|
|
static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
|
|
{
|
|
const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
|
|
u64 j64 = get_jiffies_64();
|
|
struct speed_down_verdict_arg arg;
|
|
unsigned int verdict = 0;
|
|
|
|
/* scan past 10 mins of error history */
|
|
memset(&arg, 0, sizeof(arg));
|
|
arg.since = j64 - min(j64, j10mins);
|
|
ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
|
|
|
|
if (arg.nr_errors[2] + arg.nr_errors[3] > 3)
|
|
verdict |= ATA_EH_SPDN_NCQ_OFF;
|
|
if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10)
|
|
verdict |= ATA_EH_SPDN_SPEED_DOWN;
|
|
|
|
/* scan past 3 mins of error history */
|
|
memset(&arg, 0, sizeof(arg));
|
|
arg.since = j64 - min(j64, j5mins);
|
|
ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
|
|
|
|
if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10)
|
|
verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
|
|
|
|
return verdict;
|
|
}
|
|
|
|
/**
|
|
* 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:
|
|
* Determined recovery action.
|
|
*/
|
|
static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
|
|
unsigned int err_mask)
|
|
{
|
|
unsigned int verdict;
|
|
unsigned int action = 0;
|
|
|
|
/* don't bother if Cat-0 error */
|
|
if (ata_eh_categorize_error(is_io, err_mask) == 0)
|
|
return 0;
|
|
|
|
/* record error and determine whether speed down is necessary */
|
|
ata_ering_record(&dev->ering, is_io, err_mask);
|
|
verdict = ata_eh_speed_down_verdict(dev);
|
|
|
|
/* turn off NCQ? */
|
|
if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
|
|
(dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
|
|
ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
|
|
dev->flags |= ATA_DFLAG_NCQ_OFF;
|
|
ata_dev_printk(dev, KERN_WARNING,
|
|
"NCQ disabled due to excessive errors\n");
|
|
goto done;
|
|
}
|
|
|
|
/* speed down? */
|
|
if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
|
|
/* speed down SATA link speed if possible */
|
|
if (sata_down_spd_limit(dev->ap) == 0) {
|
|
action |= ATA_EH_HARDRESET;
|
|
goto done;
|
|
}
|
|
|
|
/* lower transfer mode */
|
|
if (dev->spdn_cnt < 2) {
|
|
static const int dma_dnxfer_sel[] =
|
|
{ ATA_DNXFER_DMA, ATA_DNXFER_40C };
|
|
static const int pio_dnxfer_sel[] =
|
|
{ ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
|
|
int sel;
|
|
|
|
if (dev->xfer_shift != ATA_SHIFT_PIO)
|
|
sel = dma_dnxfer_sel[dev->spdn_cnt];
|
|
else
|
|
sel = pio_dnxfer_sel[dev->spdn_cnt];
|
|
|
|
dev->spdn_cnt++;
|
|
|
|
if (ata_down_xfermask_limit(dev, sel) == 0) {
|
|
action |= ATA_EH_SOFTRESET;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fall back to PIO? Slowing down to PIO is meaningless for
|
|
* SATA. Consider it only for PATA.
|
|
*/
|
|
if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
|
|
(dev->ap->cbl != ATA_CBL_SATA) &&
|
|
(dev->xfer_shift != ATA_SHIFT_PIO)) {
|
|
if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
|
|
dev->spdn_cnt = 0;
|
|
action |= ATA_EH_SOFTRESET;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
done:
|
|
/* device has been slowed down, blow error history */
|
|
ata_ering_clear(&dev->ering);
|
|
return action;
|
|
}
|
|
|
|
/**
|
|
* 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 all_err_mask = 0;
|
|
int tag, is_io = 0;
|
|
u32 serror;
|
|
int rc;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
|
|
return;
|
|
|
|
/* 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)
|
|
ehc->i.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 */
|
|
ehc->i.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);
|
|
ehc->i.action &= ~ATA_EH_REVALIDATE;
|
|
}
|
|
|
|
/* accumulate error info */
|
|
ehc->i.dev = qc->dev;
|
|
all_err_mask |= qc->err_mask;
|
|
if (qc->flags & ATA_QCFLAG_IO)
|
|
is_io = 1;
|
|
}
|
|
|
|
/* enforce default EH actions */
|
|
if (ap->pflags & ATA_PFLAG_FROZEN ||
|
|
all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
else if (all_err_mask)
|
|
ehc->i.action |= ATA_EH_REVALIDATE;
|
|
|
|
/* if we have offending qcs and the associated failed device */
|
|
if (ehc->i.dev) {
|
|
/* speed down */
|
|
ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
|
|
all_err_mask);
|
|
|
|
/* perform per-dev EH action only on the offending device */
|
|
ehc->i.dev_action[ehc->i.dev->devno] |=
|
|
ehc->i.action & ATA_EH_PERDEV_MASK;
|
|
ehc->i.action &= ~ATA_EH_PERDEV_MASK;
|
|
}
|
|
|
|
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->pflags & ATA_PFLAG_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++) {
|
|
static const char *dma_str[] = {
|
|
[DMA_BIDIRECTIONAL] = "bidi",
|
|
[DMA_TO_DEVICE] = "out",
|
|
[DMA_FROM_DEVICE] = "in",
|
|
[DMA_NONE] = "",
|
|
};
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
|
|
continue;
|
|
|
|
ata_dev_printk(qc->dev, KERN_ERR,
|
|
"cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
|
|
"tag %d cdb 0x%x data %u %s\n "
|
|
"res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
|
|
"Emask 0x%x (%s)\n",
|
|
cmd->command, cmd->feature, cmd->nsect,
|
|
cmd->lbal, cmd->lbam, cmd->lbah,
|
|
cmd->hob_feature, cmd->hob_nsect,
|
|
cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
|
|
cmd->device, qc->tag, qc->cdb[0], qc->nbytes,
|
|
dma_str[qc->dma_dir],
|
|
res->command, res->feature, res->nsect,
|
|
res->lbal, res->lbam, res->lbah,
|
|
res->hob_feature, res->hob_nsect,
|
|
res->hob_lbal, res->hob_lbam, res->hob_lbah,
|
|
res->device, qc->err_mask, ata_err_string(qc->err_mask));
|
|
}
|
|
}
|
|
|
|
static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
|
|
unsigned int *classes, unsigned long deadline)
|
|
{
|
|
int i, rc;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
classes[i] = ATA_DEV_UNKNOWN;
|
|
|
|
rc = reset(ap, classes, deadline);
|
|
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 verbose = !(ehc->i.flags & ATA_EHI_QUIET);
|
|
int try = 0;
|
|
unsigned long deadline;
|
|
unsigned int action;
|
|
ata_reset_fn_t reset;
|
|
int i, rc;
|
|
|
|
/* about to reset */
|
|
ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK);
|
|
|
|
/* 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, jiffies + ATA_EH_PRERESET_TIMEOUT);
|
|
if (rc) {
|
|
if (rc == -ENOENT) {
|
|
ata_port_printk(ap, KERN_DEBUG,
|
|
"port disabled. ignoring.\n");
|
|
ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
|
|
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++)
|
|
classes[i] = ATA_DEV_NONE;
|
|
|
|
rc = 0;
|
|
} else
|
|
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) {
|
|
if (softreset)
|
|
reset = softreset;
|
|
else
|
|
reset = hardreset;
|
|
}
|
|
|
|
retry:
|
|
deadline = jiffies + ata_eh_reset_timeouts[try++];
|
|
|
|
/* shut up during boot probing */
|
|
if (verbose)
|
|
ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
|
|
reset == softreset ? "soft" : "hard");
|
|
|
|
/* mark that this EH session started with reset */
|
|
if (reset == hardreset)
|
|
ehc->i.flags |= ATA_EHI_DID_HARDRESET;
|
|
else
|
|
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
|
|
|
|
rc = ata_do_reset(ap, reset, classes, deadline);
|
|
|
|
if (reset == hardreset &&
|
|
ata_eh_followup_srst_needed(rc, classify, classes)) {
|
|
/* okay, let's do follow-up softreset */
|
|
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, deadline);
|
|
|
|
if (rc == 0 && classify &&
|
|
classes[0] == ATA_DEV_UNKNOWN) {
|
|
ata_port_printk(ap, KERN_ERR,
|
|
"classification failed\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) {
|
|
unsigned long now = jiffies;
|
|
|
|
if (time_before(now, deadline)) {
|
|
unsigned long delta = deadline - jiffies;
|
|
|
|
ata_port_printk(ap, KERN_WARNING, "reset failed "
|
|
"(errno=%d), retrying in %u secs\n",
|
|
rc, (jiffies_to_msecs(delta) + 999) / 1000);
|
|
|
|
schedule_timeout_uninterruptible(delta);
|
|
}
|
|
|
|
if (reset == hardreset &&
|
|
try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1)
|
|
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, ehc->i.action & 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 int new_mask = 0;
|
|
unsigned long flags;
|
|
int i, rc = 0;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
/* For PATA drive side cable detection to work, IDENTIFY must
|
|
* be done backwards such that PDIAG- is released by the slave
|
|
* device before the master device is identified.
|
|
*/
|
|
for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) {
|
|
unsigned int action, readid_flags = 0;
|
|
|
|
dev = &ap->device[i];
|
|
action = ata_eh_dev_action(dev);
|
|
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET)
|
|
readid_flags |= ATA_READID_POSTRESET;
|
|
|
|
if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
|
|
if (ata_port_offline(ap)) {
|
|
rc = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
|
|
rc = ata_dev_revalidate(dev, readid_flags);
|
|
if (rc)
|
|
goto err;
|
|
|
|
ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
|
|
|
|
/* Configuration may have changed, reconfigure
|
|
* transfer mode.
|
|
*/
|
|
ehc->i.flags |= ATA_EHI_SETMODE;
|
|
|
|
/* 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, readid_flags,
|
|
dev->id);
|
|
switch (rc) {
|
|
case 0:
|
|
new_mask |= 1 << i;
|
|
break;
|
|
case -ENOENT:
|
|
/* IDENTIFY was issued to non-existent
|
|
* device. No need to reset. Just
|
|
* thaw and kill the device.
|
|
*/
|
|
ata_eh_thaw_port(ap);
|
|
dev->class = ATA_DEV_UNKNOWN;
|
|
break;
|
|
default:
|
|
dev->class = ATA_DEV_UNKNOWN;
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* PDIAG- should have been released, ask cable type if post-reset */
|
|
if ((ehc->i.flags & ATA_EHI_DID_RESET) && ap->ops->cable_detect)
|
|
ap->cbl = ap->ops->cable_detect(ap);
|
|
|
|
/* Configure new devices forward such that user doesn't see
|
|
* device detection messages backwards.
|
|
*/
|
|
for (i = 0; i < ATA_MAX_DEVICES; i++) {
|
|
dev = &ap->device[i];
|
|
|
|
if (!(new_mask & (1 << i)))
|
|
continue;
|
|
|
|
ehc->i.flags |= ATA_EHI_PRINTINFO;
|
|
rc = ata_dev_configure(dev);
|
|
ehc->i.flags &= ~ATA_EHI_PRINTINFO;
|
|
if (rc)
|
|
goto err;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
/* new device discovered, configure xfermode */
|
|
ehc->i.flags |= ATA_EHI_SETMODE;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
*r_failed_dev = dev;
|
|
DPRINTK("EXIT rc=%d\n", rc);
|
|
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;
|
|
|
|
/* thaw frozen port, resume link and recover failed devices */
|
|
if ((ap->pflags & ATA_PFLAG_FROZEN) ||
|
|
(ehc->i.flags & ATA_EHI_RESUME_LINK) || 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 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;
|
|
|
|
/* collect port action mask recorded in dev actions */
|
|
ehc->i.action |= ehc->i.dev_action[i] & ~ATA_EH_PERDEV_MASK;
|
|
ehc->i.dev_action[i] &= ATA_EH_PERDEV_MASK;
|
|
|
|
/* 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:
|
|
rc = 0;
|
|
|
|
/* if UNLOADING, finish immediately */
|
|
if (ap->pflags & ATA_PFLAG_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 necessary */
|
|
if (ehc->i.flags & ATA_EHI_SETMODE) {
|
|
rc = ata_set_mode(ap, &dev);
|
|
if (rc)
|
|
goto dev_fail;
|
|
ehc->i.flags &= ~ATA_EHI_SETMODE;
|
|
}
|
|
|
|
goto out;
|
|
|
|
dev_fail:
|
|
ehc->tries[dev->devno]--;
|
|
|
|
switch (rc) {
|
|
case -ENODEV:
|
|
/* device missing or wrong IDENTIFY data, schedule probing */
|
|
ehc->i.probe_mask |= (1 << dev->devno);
|
|
case -EINVAL:
|
|
/* give it just one more chance */
|
|
ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
|
|
case -EIO:
|
|
if (ehc->tries[dev->devno] == 1) {
|
|
/* This is the last chance, better to slow
|
|
* down than lose it.
|
|
*/
|
|
sata_down_spd_limit(ap);
|
|
ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
ata_eh_autopsy(ap);
|
|
ata_eh_report(ap);
|
|
ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
|
|
ata_eh_finish(ap);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/**
|
|
* ata_eh_handle_port_suspend - perform port suspend operation
|
|
* @ap: port to suspend
|
|
*
|
|
* Suspend @ap.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
static void ata_eh_handle_port_suspend(struct ata_port *ap)
|
|
{
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
/* are we suspending? */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
|
|
ap->pm_mesg.event == PM_EVENT_ON) {
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
return;
|
|
}
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
|
|
|
|
/* suspend */
|
|
ata_eh_freeze_port(ap);
|
|
|
|
if (ap->ops->port_suspend)
|
|
rc = ap->ops->port_suspend(ap, ap->pm_mesg);
|
|
|
|
/* report result */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
ap->pflags &= ~ATA_PFLAG_PM_PENDING;
|
|
if (rc == 0)
|
|
ap->pflags |= ATA_PFLAG_SUSPENDED;
|
|
else
|
|
ata_port_schedule_eh(ap);
|
|
|
|
if (ap->pm_result) {
|
|
*ap->pm_result = rc;
|
|
ap->pm_result = NULL;
|
|
}
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_handle_port_resume - perform port resume operation
|
|
* @ap: port to resume
|
|
*
|
|
* Resume @ap.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
static void ata_eh_handle_port_resume(struct ata_port *ap)
|
|
{
|
|
unsigned long flags;
|
|
int rc = 0;
|
|
|
|
/* are we resuming? */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
|
|
ap->pm_mesg.event != PM_EVENT_ON) {
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
return;
|
|
}
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
|
|
|
|
if (ap->ops->port_resume)
|
|
rc = ap->ops->port_resume(ap);
|
|
|
|
/* report result */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
|
|
if (ap->pm_result) {
|
|
*ap->pm_result = rc;
|
|
ap->pm_result = NULL;
|
|
}
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
#endif /* CONFIG_PM */
|