3440 lines
87 KiB
C
3440 lines
87 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 <linux/blkdev.h>
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#include <linux/pci.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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/* speed down verdicts */
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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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ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
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/* error flags */
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ATA_EFLAG_IS_IO = (1 << 0),
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ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
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/* error categories */
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ATA_ECAT_NONE = 0,
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ATA_ECAT_ATA_BUS = 1,
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ATA_ECAT_TOUT_HSM = 2,
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ATA_ECAT_UNK_DEV = 3,
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ATA_ECAT_DUBIOUS_NONE = 4,
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ATA_ECAT_DUBIOUS_ATA_BUS = 5,
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ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
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ATA_ECAT_DUBIOUS_UNK_DEV = 7,
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ATA_ECAT_NR = 8,
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ATA_EH_CMD_DFL_TIMEOUT = 5000,
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/* always put at least this amount of time between resets */
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ATA_EH_RESET_COOL_DOWN = 5000,
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/* Waiting in ->prereset can never be reliable. It's
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* sometimes nice to wait there but it can't be depended upon;
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* otherwise, we wouldn't be resetting. Just give it enough
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* time for most drives to spin up.
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*/
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ATA_EH_PRERESET_TIMEOUT = 10000,
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ATA_EH_FASTDRAIN_INTERVAL = 3000,
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ATA_EH_UA_TRIES = 5,
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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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10000, /* most drives spin up by 10sec */
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10000, /* > 99% working drives spin up before 20sec */
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35000, /* give > 30 secs of idleness for retarded devices */
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5000, /* and sweet one last chance */
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ULONG_MAX, /* > 1 min has elapsed, give up */
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};
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static const unsigned long ata_eh_identify_timeouts[] = {
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5000, /* covers > 99% of successes and not too boring on failures */
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10000, /* combined time till here is enough even for media access */
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30000, /* for true idiots */
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ULONG_MAX,
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};
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static const unsigned long ata_eh_other_timeouts[] = {
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5000, /* same rationale as identify timeout */
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10000, /* ditto */
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/* but no merciful 30sec for other commands, it just isn't worth it */
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ULONG_MAX,
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};
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struct ata_eh_cmd_timeout_ent {
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const u8 *commands;
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const unsigned long *timeouts;
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};
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/* The following table determines timeouts to use for EH internal
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* commands. Each table entry is a command class and matches the
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* commands the entry applies to and the timeout table to use.
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*
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* On the retry after a command timed out, the next timeout value from
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* the table is used. If the table doesn't contain further entries,
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* the last value is used.
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*
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* ehc->cmd_timeout_idx keeps track of which timeout to use per
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* command class, so if SET_FEATURES times out on the first try, the
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* next try will use the second timeout value only for that class.
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*/
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#define CMDS(cmds...) (const u8 []){ cmds, 0 }
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static const struct ata_eh_cmd_timeout_ent
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ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
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{ .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
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.timeouts = ata_eh_identify_timeouts, },
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{ .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
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.timeouts = ata_eh_other_timeouts, },
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{ .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
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.timeouts = ata_eh_other_timeouts, },
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{ .commands = CMDS(ATA_CMD_SET_FEATURES),
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.timeouts = ata_eh_other_timeouts, },
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{ .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
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.timeouts = ata_eh_other_timeouts, },
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};
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#undef CMDS
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static void __ata_port_freeze(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_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
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va_list args)
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{
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ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
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ATA_EH_DESC_LEN - ehi->desc_len,
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fmt, args);
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}
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/**
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* __ata_ehi_push_desc - push error description without adding separator
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* @ehi: target EHI
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* @fmt: printf format string
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*
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* Format string according to @fmt and append it to @ehi->desc.
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*/
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void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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__ata_ehi_pushv_desc(ehi, fmt, args);
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va_end(args);
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}
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/**
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* ata_ehi_push_desc - push error description with separator
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* @ehi: target EHI
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* @fmt: printf format string
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*
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* Format string according to @fmt and append it to @ehi->desc.
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* If @ehi->desc is not empty, ", " is added in-between.
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*/
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void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
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{
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va_list args;
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if (ehi->desc_len)
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__ata_ehi_push_desc(ehi, ", ");
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va_start(args, fmt);
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__ata_ehi_pushv_desc(ehi, fmt, args);
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va_end(args);
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}
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/**
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* ata_ehi_clear_desc - clean error description
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* @ehi: target EHI
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*
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* Clear @ehi->desc.
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*/
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void ata_ehi_clear_desc(struct ata_eh_info *ehi)
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{
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ehi->desc[0] = '\0';
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ehi->desc_len = 0;
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}
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/**
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* ata_port_desc - append port description
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* @ap: target ATA port
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* @fmt: printf format string
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*
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* Format string according to @fmt and append it to port
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* description. If port description is not empty, " " is added
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* in-between. This function is to be used while initializing
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* ata_host. The description is printed on host registration.
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*
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* LOCKING:
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* None.
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*/
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void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
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{
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va_list args;
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WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
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if (ap->link.eh_info.desc_len)
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__ata_ehi_push_desc(&ap->link.eh_info, " ");
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va_start(args, fmt);
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__ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
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va_end(args);
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}
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#ifdef CONFIG_PCI
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/**
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* ata_port_pbar_desc - append PCI BAR description
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* @ap: target ATA port
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* @bar: target PCI BAR
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* @offset: offset into PCI BAR
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* @name: name of the area
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*
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* If @offset is negative, this function formats a string which
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* contains the name, address, size and type of the BAR and
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* appends it to the port description. If @offset is zero or
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* positive, only name and offsetted address is appended.
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*
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* LOCKING:
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* None.
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*/
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void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
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const char *name)
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{
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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char *type = "";
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unsigned long long start, len;
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if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
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type = "m";
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else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
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type = "i";
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start = (unsigned long long)pci_resource_start(pdev, bar);
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len = (unsigned long long)pci_resource_len(pdev, bar);
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if (offset < 0)
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ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
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else
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ata_port_desc(ap, "%s 0x%llx", name,
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start + (unsigned long long)offset);
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}
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#endif /* CONFIG_PCI */
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static int ata_lookup_timeout_table(u8 cmd)
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{
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int i;
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for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
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const u8 *cur;
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for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
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if (*cur == cmd)
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return i;
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}
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return -1;
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}
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/**
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* ata_internal_cmd_timeout - determine timeout for an internal command
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* @dev: target device
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* @cmd: internal command to be issued
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*
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* Determine timeout for internal command @cmd for @dev.
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*
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* LOCKING:
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* EH context.
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*
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* RETURNS:
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* Determined timeout.
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*/
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unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
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{
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struct ata_eh_context *ehc = &dev->link->eh_context;
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int ent = ata_lookup_timeout_table(cmd);
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int idx;
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if (ent < 0)
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return ATA_EH_CMD_DFL_TIMEOUT;
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idx = ehc->cmd_timeout_idx[dev->devno][ent];
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return ata_eh_cmd_timeout_table[ent].timeouts[idx];
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}
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/**
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* ata_internal_cmd_timed_out - notification for internal command timeout
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* @dev: target device
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* @cmd: internal command which timed out
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*
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* Notify EH that internal command @cmd for @dev timed out. This
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* function should be called only for commands whose timeouts are
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* determined using ata_internal_cmd_timeout().
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*
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* LOCKING:
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* EH context.
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*/
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void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
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{
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struct ata_eh_context *ehc = &dev->link->eh_context;
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int ent = ata_lookup_timeout_table(cmd);
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int idx;
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if (ent < 0)
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return;
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idx = ehc->cmd_timeout_idx[dev->devno][ent];
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if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
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ehc->cmd_timeout_idx[dev->devno][ent]++;
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}
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static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
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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->eflags = eflags;
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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 ent;
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return NULL;
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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->link->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_link *link, struct ata_device *dev,
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struct ata_eh_info *ehi, unsigned int action)
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{
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struct ata_device *tdev;
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if (!dev) {
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ehi->action &= ~action;
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ata_for_each_dev(tdev, link, ALL)
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ehi->dev_action[tdev->devno] &= ~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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ata_for_each_dev(tdev, link, ALL)
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ehi->dev_action[tdev->devno] |=
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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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/**
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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 blk_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 blk_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 = BLK_EH_NOT_HANDLED;
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goto out;
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}
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ret = BLK_EH_HANDLED;
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spin_lock_irqsave(ap->lock, flags);
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qc = ata_qc_from_tag(ap, ap->link.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 = BLK_EH_NOT_HANDLED;
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}
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spin_unlock_irqrestore(ap->lock, flags);
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|
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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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|
|
static void ata_eh_unload(struct ata_port *ap)
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|
{
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struct ata_link *link;
|
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struct ata_device *dev;
|
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unsigned long flags;
|
|
|
|
/* Restore SControl IPM and SPD for the next driver and
|
|
* disable attached devices.
|
|
*/
|
|
ata_for_each_link(link, ap, PMP_FIRST) {
|
|
sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
|
|
ata_for_each_dev(dev, link, ALL)
|
|
ata_dev_disable(dev);
|
|
}
|
|
|
|
/* freeze and set UNLOADED */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
ata_port_freeze(ap); /* won't be thawed */
|
|
ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
|
|
ap->pflags |= ATA_PFLAG_UNLOADED;
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_error - SCSI layer error handler callback
|
|
* @host: SCSI host on which error occurred
|
|
*
|
|
* Handles SCSI-layer-thrown error events.
|
|
*
|
|
* LOCKING:
|
|
* Inherited from SCSI layer (none, can sleep)
|
|
*
|
|
* RETURNS:
|
|
* Zero.
|
|
*/
|
|
void ata_scsi_error(struct Scsi_Host *host)
|
|
{
|
|
struct ata_port *ap = ata_shost_to_port(host);
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
/* synchronize with port task */
|
|
ata_port_flush_task(ap);
|
|
|
|
/* synchronize with host lock and sort out timeouts */
|
|
|
|
/* For new EH, all qcs are finished in one of three ways -
|
|
* normal completion, error completion, and SCSI timeout.
|
|
* Both cmpletions can race against SCSI timeout. When normal
|
|
* completion wins, the qc never reaches EH. When error
|
|
* completion wins, the qc has ATA_QCFLAG_FAILED set.
|
|
*
|
|
* When SCSI timeout wins, things are a bit more complex.
|
|
* Normal or error completion can occur after the timeout but
|
|
* before this point. In such cases, both types of
|
|
* completions are honored. A scmd is determined to have
|
|
* timed out iff its associated qc is active and not failed.
|
|
*/
|
|
if (ap->ops->error_handler) {
|
|
struct scsi_cmnd *scmd, *tmp;
|
|
int nr_timedout = 0;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
|
|
struct ata_queued_cmd *qc;
|
|
|
|
for (i = 0; i < ATA_MAX_QUEUE; i++) {
|
|
qc = __ata_qc_from_tag(ap, i);
|
|
if (qc->flags & ATA_QCFLAG_ACTIVE &&
|
|
qc->scsicmd == scmd)
|
|
break;
|
|
}
|
|
|
|
if (i < ATA_MAX_QUEUE) {
|
|
/* the scmd has an associated qc */
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED)) {
|
|
/* which hasn't failed yet, timeout */
|
|
qc->err_mask |= AC_ERR_TIMEOUT;
|
|
qc->flags |= ATA_QCFLAG_FAILED;
|
|
nr_timedout++;
|
|
}
|
|
} else {
|
|
/* Normal completion occurred after
|
|
* SCSI timeout but before this point.
|
|
* Successfully complete it.
|
|
*/
|
|
scmd->retries = scmd->allowed;
|
|
scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
|
|
}
|
|
}
|
|
|
|
/* If we have timed out qcs. They belong to EH from
|
|
* this point but the state of the controller is
|
|
* unknown. Freeze the port to make sure the IRQ
|
|
* handler doesn't diddle with those qcs. This must
|
|
* be done atomically w.r.t. setting QCFLAG_FAILED.
|
|
*/
|
|
if (nr_timedout)
|
|
__ata_port_freeze(ap);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
/* initialize eh_tries */
|
|
ap->eh_tries = ATA_EH_MAX_TRIES;
|
|
} else
|
|
spin_unlock_wait(ap->lock);
|
|
|
|
repeat:
|
|
/* invoke error handler */
|
|
if (ap->ops->error_handler) {
|
|
struct ata_link *link;
|
|
|
|
/* kill fast drain timer */
|
|
del_timer_sync(&ap->fastdrain_timer);
|
|
|
|
/* process port resume request */
|
|
ata_eh_handle_port_resume(ap);
|
|
|
|
/* fetch & clear EH info */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
ata_for_each_link(link, ap, HOST_FIRST) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_device *dev;
|
|
|
|
memset(&link->eh_context, 0, sizeof(link->eh_context));
|
|
link->eh_context.i = link->eh_info;
|
|
memset(&link->eh_info, 0, sizeof(link->eh_info));
|
|
|
|
ata_for_each_dev(dev, link, ENABLED) {
|
|
int devno = dev->devno;
|
|
|
|
ehc->saved_xfer_mode[devno] = dev->xfer_mode;
|
|
if (ata_ncq_enabled(dev))
|
|
ehc->saved_ncq_enabled |= 1 << devno;
|
|
}
|
|
}
|
|
|
|
ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
|
|
ap->pflags &= ~ATA_PFLAG_EH_PENDING;
|
|
ap->excl_link = NULL; /* don't maintain exclusion over EH */
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
/* invoke EH, skip if unloading or suspended */
|
|
if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
|
|
ap->ops->error_handler(ap);
|
|
else {
|
|
/* if unloading, commence suicide */
|
|
if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
|
|
!(ap->pflags & ATA_PFLAG_UNLOADED))
|
|
ata_eh_unload(ap);
|
|
ata_eh_finish(ap);
|
|
}
|
|
|
|
/* process port suspend request */
|
|
ata_eh_handle_port_suspend(ap);
|
|
|
|
/* Exception might have happend after ->error_handler
|
|
* recovered the port but before this point. Repeat
|
|
* EH in such case.
|
|
*/
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
if (ap->pflags & ATA_PFLAG_EH_PENDING) {
|
|
if (--ap->eh_tries) {
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
goto repeat;
|
|
}
|
|
ata_port_printk(ap, KERN_ERR, "EH pending after %d "
|
|
"tries, giving up\n", ATA_EH_MAX_TRIES);
|
|
ap->pflags &= ~ATA_PFLAG_EH_PENDING;
|
|
}
|
|
|
|
/* this run is complete, make sure EH info is clear */
|
|
ata_for_each_link(link, ap, HOST_FIRST)
|
|
memset(&link->eh_info, 0, sizeof(link->eh_info));
|
|
|
|
/* Clear host_eh_scheduled while holding ap->lock such
|
|
* that if exception occurs after this point but
|
|
* before EH completion, SCSI midlayer will
|
|
* re-initiate EH.
|
|
*/
|
|
host->host_eh_scheduled = 0;
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
} else {
|
|
WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
|
|
ap->ops->eng_timeout(ap);
|
|
}
|
|
|
|
/* finish or retry handled scmd's and clean up */
|
|
WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
|
|
|
|
scsi_eh_flush_done_q(&ap->eh_done_q);
|
|
|
|
/* clean up */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
if (ap->pflags & ATA_PFLAG_LOADING)
|
|
ap->pflags &= ~ATA_PFLAG_LOADING;
|
|
else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
|
|
queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0);
|
|
|
|
if (ap->pflags & ATA_PFLAG_RECOVERED)
|
|
ata_port_printk(ap, KERN_INFO, "EH complete\n");
|
|
|
|
ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
|
|
|
|
/* tell wait_eh that we're done */
|
|
ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
|
|
wake_up_all(&ap->eh_wait_q);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
DPRINTK("EXIT\n");
|
|
}
|
|
|
|
/**
|
|
* ata_port_wait_eh - Wait for the currently pending EH to complete
|
|
* @ap: Port to wait EH for
|
|
*
|
|
* Wait until the currently pending EH is complete.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
void ata_port_wait_eh(struct ata_port *ap)
|
|
{
|
|
unsigned long flags;
|
|
DEFINE_WAIT(wait);
|
|
|
|
retry:
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
|
|
prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
schedule();
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
}
|
|
finish_wait(&ap->eh_wait_q, &wait);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
/* make sure SCSI EH is complete */
|
|
if (scsi_host_in_recovery(ap->scsi_host)) {
|
|
msleep(10);
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
static int ata_eh_nr_in_flight(struct ata_port *ap)
|
|
{
|
|
unsigned int tag;
|
|
int nr = 0;
|
|
|
|
/* count only non-internal commands */
|
|
for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
|
|
if (ata_qc_from_tag(ap, tag))
|
|
nr++;
|
|
|
|
return nr;
|
|
}
|
|
|
|
void ata_eh_fastdrain_timerfn(unsigned long arg)
|
|
{
|
|
struct ata_port *ap = (void *)arg;
|
|
unsigned long flags;
|
|
int cnt;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
cnt = ata_eh_nr_in_flight(ap);
|
|
|
|
/* are we done? */
|
|
if (!cnt)
|
|
goto out_unlock;
|
|
|
|
if (cnt == ap->fastdrain_cnt) {
|
|
unsigned int tag;
|
|
|
|
/* No progress during the last interval, tag all
|
|
* in-flight qcs as timed out and freeze the port.
|
|
*/
|
|
for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
|
|
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
|
|
if (qc)
|
|
qc->err_mask |= AC_ERR_TIMEOUT;
|
|
}
|
|
|
|
ata_port_freeze(ap);
|
|
} else {
|
|
/* some qcs have finished, give it another chance */
|
|
ap->fastdrain_cnt = cnt;
|
|
ap->fastdrain_timer.expires =
|
|
ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
|
|
add_timer(&ap->fastdrain_timer);
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
|
|
* @ap: target ATA port
|
|
* @fastdrain: activate fast drain
|
|
*
|
|
* Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
|
|
* is non-zero and EH wasn't pending before. Fast drain ensures
|
|
* that EH kicks in in timely manner.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host lock)
|
|
*/
|
|
static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
|
|
{
|
|
int cnt;
|
|
|
|
/* already scheduled? */
|
|
if (ap->pflags & ATA_PFLAG_EH_PENDING)
|
|
return;
|
|
|
|
ap->pflags |= ATA_PFLAG_EH_PENDING;
|
|
|
|
if (!fastdrain)
|
|
return;
|
|
|
|
/* do we have in-flight qcs? */
|
|
cnt = ata_eh_nr_in_flight(ap);
|
|
if (!cnt)
|
|
return;
|
|
|
|
/* activate fast drain */
|
|
ap->fastdrain_cnt = cnt;
|
|
ap->fastdrain_timer.expires =
|
|
ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
|
|
add_timer(&ap->fastdrain_timer);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
ata_eh_set_pending(ap, 1);
|
|
|
|
/* 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.
|
|
*/
|
|
blk_abort_request(qc->scsicmd->request);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
ata_eh_set_pending(ap, 1);
|
|
scsi_schedule_eh(ap->scsi_host);
|
|
|
|
DPRINTK("port EH scheduled\n");
|
|
}
|
|
|
|
static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
|
|
{
|
|
int tag, nr_aborted = 0;
|
|
|
|
WARN_ON(!ap->ops->error_handler);
|
|
|
|
/* we're gonna abort all commands, no need for fast drain */
|
|
ata_eh_set_pending(ap, 0);
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
|
|
|
|
if (qc && (!link || qc->dev->link == link)) {
|
|
qc->flags |= ATA_QCFLAG_FAILED;
|
|
ata_qc_complete(qc);
|
|
nr_aborted++;
|
|
}
|
|
}
|
|
|
|
if (!nr_aborted)
|
|
ata_port_schedule_eh(ap);
|
|
|
|
return nr_aborted;
|
|
}
|
|
|
|
/**
|
|
* ata_link_abort - abort all qc's on the link
|
|
* @link: ATA link to abort qc's for
|
|
*
|
|
* Abort all active qc's active on @link and schedule EH.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host lock)
|
|
*
|
|
* RETURNS:
|
|
* Number of aborted qc's.
|
|
*/
|
|
int ata_link_abort(struct ata_link *link)
|
|
{
|
|
return ata_do_link_abort(link->ap, link);
|
|
}
|
|
|
|
/**
|
|
* ata_port_abort - abort all qc's on the port
|
|
* @ap: ATA port to abort qc's for
|
|
*
|
|
* Abort all active qc's of @ap and schedule EH.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*
|
|
* RETURNS:
|
|
* Number of aborted qc's.
|
|
*/
|
|
int ata_port_abort(struct ata_port *ap)
|
|
{
|
|
return ata_do_link_abort(ap, NULL);
|
|
}
|
|
|
|
/**
|
|
* __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;
|
|
}
|
|
|
|
/**
|
|
* sata_async_notification - SATA async notification handler
|
|
* @ap: ATA port where async notification is received
|
|
*
|
|
* Handler to be called when async notification via SDB FIS is
|
|
* received. This function schedules EH if necessary.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host lock)
|
|
*
|
|
* RETURNS:
|
|
* 1 if EH is scheduled, 0 otherwise.
|
|
*/
|
|
int sata_async_notification(struct ata_port *ap)
|
|
{
|
|
u32 sntf;
|
|
int rc;
|
|
|
|
if (!(ap->flags & ATA_FLAG_AN))
|
|
return 0;
|
|
|
|
rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
|
|
if (rc == 0)
|
|
sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
|
|
|
|
if (!sata_pmp_attached(ap) || rc) {
|
|
/* PMP is not attached or SNTF is not available */
|
|
if (!sata_pmp_attached(ap)) {
|
|
/* PMP is not attached. Check whether ATAPI
|
|
* AN is configured. If so, notify media
|
|
* change.
|
|
*/
|
|
struct ata_device *dev = ap->link.device;
|
|
|
|
if ((dev->class == ATA_DEV_ATAPI) &&
|
|
(dev->flags & ATA_DFLAG_AN))
|
|
ata_scsi_media_change_notify(dev);
|
|
return 0;
|
|
} else {
|
|
/* PMP is attached but SNTF is not available.
|
|
* ATAPI async media change notification is
|
|
* not used. The PMP must be reporting PHY
|
|
* status change, schedule EH.
|
|
*/
|
|
ata_port_schedule_eh(ap);
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* PMP is attached and SNTF is available */
|
|
struct ata_link *link;
|
|
|
|
/* check and notify ATAPI AN */
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
if (!(sntf & (1 << link->pmp)))
|
|
continue;
|
|
|
|
if ((link->device->class == ATA_DEV_ATAPI) &&
|
|
(link->device->flags & ATA_DFLAG_AN))
|
|
ata_scsi_media_change_notify(link->device);
|
|
}
|
|
|
|
/* If PMP is reporting that PHY status of some
|
|
* downstream ports has changed, schedule EH.
|
|
*/
|
|
if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
|
|
ata_port_schedule_eh(ap);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
void ata_eh_detach_dev(struct ata_device *dev)
|
|
{
|
|
struct ata_link *link = dev->link;
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
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 info */
|
|
ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
|
|
ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
|
|
ehc->saved_xfer_mode[dev->devno] = 0;
|
|
ehc->saved_ncq_enabled &= ~(1 << dev->devno);
|
|
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_about_to_do - about to perform eh_action
|
|
* @link: target ATA link
|
|
* @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 @link->eh_info such that eh actions are not unnecessarily
|
|
* repeated.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
|
|
unsigned int action)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_info *ehi = &link->eh_info;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
ata_eh_clear_action(link, dev, ehi, action);
|
|
|
|
/* About to take EH action, set RECOVERED. Ignore actions on
|
|
* slave links as master will do them again.
|
|
*/
|
|
if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
|
|
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 @link->eh_context.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
void ata_eh_done(struct ata_link *link, struct ata_device *dev,
|
|
unsigned int action)
|
|
{
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
|
|
ata_eh_clear_action(link, dev, &ehc->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, 0);
|
|
|
|
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->link->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_tur - perform ATAPI TEST_UNIT_READY
|
|
* @dev: target ATAPI device
|
|
* @r_sense_key: out parameter for sense_key
|
|
*
|
|
* Perform ATAPI TEST_UNIT_READY.
|
|
*
|
|
* LOCKING:
|
|
* EH context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, AC_ERR_* mask on failure.
|
|
*/
|
|
static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
|
|
{
|
|
u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
|
|
struct ata_taskfile tf;
|
|
unsigned int err_mask;
|
|
|
|
ata_tf_init(dev, &tf);
|
|
|
|
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
|
|
tf.command = ATA_CMD_PACKET;
|
|
tf.protocol = ATAPI_PROT_NODATA;
|
|
|
|
err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
|
|
if (err_mask == AC_ERR_DEV)
|
|
*r_sense_key = tf.feature >> 4;
|
|
return err_mask;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
* @dfl_sense_key: default sense key to use
|
|
*
|
|
* 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,
|
|
u8 *sense_buf, u8 dfl_sense_key)
|
|
{
|
|
u8 cdb[ATAPI_CDB_LEN] =
|
|
{ REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
|
|
struct ata_port *ap = dev->link->ap;
|
|
struct ata_taskfile tf;
|
|
|
|
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] = dfl_sense_key;
|
|
|
|
/* some devices time out if garbage left in tf */
|
|
ata_tf_init(dev, &tf);
|
|
|
|
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 = ATAPI_PROT_DMA;
|
|
tf.feature |= ATAPI_PKT_DMA;
|
|
} else {
|
|
tf.protocol = ATAPI_PROT_PIO;
|
|
tf.lbam = SCSI_SENSE_BUFFERSIZE;
|
|
tf.lbah = 0;
|
|
}
|
|
|
|
return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
|
|
sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_analyze_serror - analyze SError for a failed port
|
|
* @link: ATA link to analyze SError for
|
|
*
|
|
* Analyze SError if available and further determine cause of
|
|
* failure.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_analyze_serror(struct ata_link *link)
|
|
{
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
u32 serror = ehc->i.serror;
|
|
unsigned int err_mask = 0, action = 0;
|
|
u32 hotplug_mask;
|
|
|
|
if (serror & (SERR_PERSISTENT | SERR_DATA)) {
|
|
err_mask |= AC_ERR_ATA_BUS;
|
|
action |= ATA_EH_RESET;
|
|
}
|
|
if (serror & SERR_PROTOCOL) {
|
|
err_mask |= AC_ERR_HSM;
|
|
action |= ATA_EH_RESET;
|
|
}
|
|
if (serror & SERR_INTERNAL) {
|
|
err_mask |= AC_ERR_SYSTEM;
|
|
action |= ATA_EH_RESET;
|
|
}
|
|
|
|
/* Determine whether a hotplug event has occurred. Both
|
|
* SError.N/X are considered hotplug events for enabled or
|
|
* host links. For disabled PMP links, only N bit is
|
|
* considered as X bit is left at 1 for link plugging.
|
|
*/
|
|
hotplug_mask = 0;
|
|
|
|
if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
|
|
hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
|
|
else
|
|
hotplug_mask = SERR_PHYRDY_CHG;
|
|
|
|
if (serror & hotplug_mask)
|
|
ata_ehi_hotplugged(&ehc->i);
|
|
|
|
ehc->i.err_mask |= err_mask;
|
|
ehc->i.action |= action;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_analyze_ncq_error - analyze NCQ error
|
|
* @link: ATA link 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).
|
|
*/
|
|
void ata_eh_analyze_ncq_error(struct ata_link *link)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_device *dev = link->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 (!link->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_link_printk(link, KERN_ERR, "failed to read log page 10h "
|
|
"(errno=%d)\n", rc);
|
|
return;
|
|
}
|
|
|
|
if (!(link->sactive & (1 << tag))) {
|
|
ata_link_printk(link, 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->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
|
|
qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
|
|
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_RESET;
|
|
}
|
|
|
|
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->dev,
|
|
qc->scsicmd->sense_buffer,
|
|
qc->result_tf.feature >> 4);
|
|
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_RESET;
|
|
|
|
return action;
|
|
}
|
|
|
|
static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
|
|
int *xfer_ok)
|
|
{
|
|
int base = 0;
|
|
|
|
if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
|
|
*xfer_ok = 1;
|
|
|
|
if (!*xfer_ok)
|
|
base = ATA_ECAT_DUBIOUS_NONE;
|
|
|
|
if (err_mask & AC_ERR_ATA_BUS)
|
|
return base + ATA_ECAT_ATA_BUS;
|
|
|
|
if (err_mask & AC_ERR_TIMEOUT)
|
|
return base + ATA_ECAT_TOUT_HSM;
|
|
|
|
if (eflags & ATA_EFLAG_IS_IO) {
|
|
if (err_mask & AC_ERR_HSM)
|
|
return base + ATA_ECAT_TOUT_HSM;
|
|
if ((err_mask &
|
|
(AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
|
|
return base + ATA_ECAT_UNK_DEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct speed_down_verdict_arg {
|
|
u64 since;
|
|
int xfer_ok;
|
|
int nr_errors[ATA_ECAT_NR];
|
|
};
|
|
|
|
static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
|
|
{
|
|
struct speed_down_verdict_arg *arg = void_arg;
|
|
int cat;
|
|
|
|
if (ent->timestamp < arg->since)
|
|
return -1;
|
|
|
|
cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
|
|
&arg->xfer_ok);
|
|
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.
|
|
*
|
|
* ECAT_ATA_BUS : ATA_BUS error for any command
|
|
*
|
|
* ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
|
|
* IO commands
|
|
*
|
|
* ECAT_UNK_DEV : Unknown DEV error for IO commands
|
|
*
|
|
* ECAT_DUBIOUS_* : Identical to above three but occurred while
|
|
* data transfer hasn't been verified.
|
|
*
|
|
* Verdicts are
|
|
*
|
|
* NCQ_OFF : Turn off NCQ.
|
|
*
|
|
* SPEED_DOWN : Speed down transfer speed but don't fall back
|
|
* to PIO.
|
|
*
|
|
* FALLBACK_TO_PIO : Fall back to PIO.
|
|
*
|
|
* Even if multiple verdicts are returned, only one action is
|
|
* taken per error. An action triggered by non-DUBIOUS errors
|
|
* clears ering, while one triggered by DUBIOUS_* errors doesn't.
|
|
* This is to expedite speed down decisions right after device is
|
|
* initially configured.
|
|
*
|
|
* The followings are speed down rules. #1 and #2 deal with
|
|
* DUBIOUS errors.
|
|
*
|
|
* 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
|
|
* occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
|
|
*
|
|
* 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
|
|
* occurred during last 5 mins, NCQ_OFF.
|
|
*
|
|
* 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
|
|
* ocurred during last 5 mins, FALLBACK_TO_PIO
|
|
*
|
|
* 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
|
|
* during last 10 mins, NCQ_OFF.
|
|
*
|
|
* 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
|
|
* UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
|
|
*
|
|
* 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 5 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[ATA_ECAT_DUBIOUS_ATA_BUS] +
|
|
arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
|
|
verdict |= ATA_EH_SPDN_SPEED_DOWN |
|
|
ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
|
|
|
|
if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
|
|
arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
|
|
verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
|
|
|
|
if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
|
|
arg.nr_errors[ATA_ECAT_TOUT_HSM] +
|
|
arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
|
|
verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
|
|
|
|
/* 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[ATA_ECAT_TOUT_HSM] +
|
|
arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
|
|
verdict |= ATA_EH_SPDN_NCQ_OFF;
|
|
|
|
if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
|
|
arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
|
|
arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
|
|
verdict |= ATA_EH_SPDN_SPEED_DOWN;
|
|
|
|
return verdict;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_speed_down - record error and speed down if necessary
|
|
* @dev: Failed device
|
|
* @eflags: mask of ATA_EFLAG_* flags
|
|
* @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,
|
|
unsigned int eflags, unsigned int err_mask)
|
|
{
|
|
struct ata_link *link = ata_dev_phys_link(dev);
|
|
int xfer_ok = 0;
|
|
unsigned int verdict;
|
|
unsigned int action = 0;
|
|
|
|
/* don't bother if Cat-0 error */
|
|
if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
|
|
return 0;
|
|
|
|
/* record error and determine whether speed down is necessary */
|
|
ata_ering_record(&dev->ering, eflags, 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(link) == 0) {
|
|
action |= ATA_EH_RESET;
|
|
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_RESET;
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Fall back to PIO? Slowing down to PIO is meaningless for
|
|
* SATA ATA devices. Consider it only for PATA and SATAPI.
|
|
*/
|
|
if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
|
|
(link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
|
|
(dev->xfer_shift != ATA_SHIFT_PIO)) {
|
|
if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
|
|
dev->spdn_cnt = 0;
|
|
action |= ATA_EH_RESET;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
done:
|
|
/* device has been slowed down, blow error history */
|
|
if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
|
|
ata_ering_clear(&dev->ering);
|
|
return action;
|
|
}
|
|
|
|
/**
|
|
* ata_eh_link_autopsy - analyze error and determine recovery action
|
|
* @link: host link to perform autopsy on
|
|
*
|
|
* Analyze why @link failed and determine which recovery actions
|
|
* are 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_link_autopsy(struct ata_link *link)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_device *dev;
|
|
unsigned int all_err_mask = 0, eflags = 0;
|
|
int tag;
|
|
u32 serror;
|
|
int rc;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
|
|
return;
|
|
|
|
/* obtain and analyze SError */
|
|
rc = sata_scr_read(link, SCR_ERROR, &serror);
|
|
if (rc == 0) {
|
|
ehc->i.serror |= serror;
|
|
ata_eh_analyze_serror(link);
|
|
} else if (rc != -EOPNOTSUPP) {
|
|
/* SError read failed, force reset and probing */
|
|
ehc->i.probe_mask |= ATA_ALL_DEVICES;
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
ehc->i.err_mask |= AC_ERR_OTHER;
|
|
}
|
|
|
|
/* analyze NCQ failure */
|
|
ata_eh_analyze_ncq_error(link);
|
|
|
|
/* 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) ||
|
|
ata_dev_phys_link(qc->dev) != link)
|
|
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);
|
|
|
|
/* determine whether the command is worth retrying */
|
|
if (!(qc->err_mask & AC_ERR_INVALID) &&
|
|
((qc->flags & ATA_QCFLAG_IO) || qc->err_mask != AC_ERR_DEV))
|
|
qc->flags |= ATA_QCFLAG_RETRY;
|
|
|
|
/* accumulate error info */
|
|
ehc->i.dev = qc->dev;
|
|
all_err_mask |= qc->err_mask;
|
|
if (qc->flags & ATA_QCFLAG_IO)
|
|
eflags |= ATA_EFLAG_IS_IO;
|
|
}
|
|
|
|
/* enforce default EH actions */
|
|
if (ap->pflags & ATA_PFLAG_FROZEN ||
|
|
all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
|
|
(!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
|
|
ehc->i.action |= ATA_EH_REVALIDATE;
|
|
|
|
/* If we have offending qcs and the associated failed device,
|
|
* perform per-dev EH action only on the offending device.
|
|
*/
|
|
if (ehc->i.dev) {
|
|
ehc->i.dev_action[ehc->i.dev->devno] |=
|
|
ehc->i.action & ATA_EH_PERDEV_MASK;
|
|
ehc->i.action &= ~ATA_EH_PERDEV_MASK;
|
|
}
|
|
|
|
/* propagate timeout to host link */
|
|
if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
|
|
ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
|
|
|
|
/* record error and consider speeding down */
|
|
dev = ehc->i.dev;
|
|
if (!dev && ((ata_link_max_devices(link) == 1 &&
|
|
ata_dev_enabled(link->device))))
|
|
dev = link->device;
|
|
|
|
if (dev) {
|
|
if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
|
|
eflags |= ATA_EFLAG_DUBIOUS_XFER;
|
|
ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
|
|
}
|
|
|
|
DPRINTK("EXIT\n");
|
|
}
|
|
|
|
/**
|
|
* ata_eh_autopsy - analyze error and determine recovery action
|
|
* @ap: host port to perform autopsy on
|
|
*
|
|
* Analyze all links of @ap and determine why they failed and
|
|
* which recovery actions are needed.
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
void ata_eh_autopsy(struct ata_port *ap)
|
|
{
|
|
struct ata_link *link;
|
|
|
|
ata_for_each_link(link, ap, EDGE)
|
|
ata_eh_link_autopsy(link);
|
|
|
|
/* Handle the frigging slave link. Autopsy is done similarly
|
|
* but actions and flags are transferred over to the master
|
|
* link and handled from there.
|
|
*/
|
|
if (ap->slave_link) {
|
|
struct ata_eh_context *mehc = &ap->link.eh_context;
|
|
struct ata_eh_context *sehc = &ap->slave_link->eh_context;
|
|
|
|
/* transfer control flags from master to slave */
|
|
sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
|
|
|
|
/* perform autopsy on the slave link */
|
|
ata_eh_link_autopsy(ap->slave_link);
|
|
|
|
/* transfer actions from slave to master and clear slave */
|
|
ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
|
|
mehc->i.action |= sehc->i.action;
|
|
mehc->i.dev_action[1] |= sehc->i.dev_action[1];
|
|
mehc->i.flags |= sehc->i.flags;
|
|
ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
|
|
}
|
|
|
|
/* Autopsy of fanout ports can affect host link autopsy.
|
|
* Perform host link autopsy last.
|
|
*/
|
|
if (sata_pmp_attached(ap))
|
|
ata_eh_link_autopsy(&ap->link);
|
|
}
|
|
|
|
/**
|
|
* ata_eh_link_report - report error handling to user
|
|
* @link: ATA link EH is going on
|
|
*
|
|
* Report EH to user.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
static void ata_eh_link_report(struct ata_link *link)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
const char *frozen, *desc;
|
|
char tries_buf[6];
|
|
int tag, nr_failed = 0;
|
|
|
|
if (ehc->i.flags & ATA_EHI_QUIET)
|
|
return;
|
|
|
|
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) ||
|
|
ata_dev_phys_link(qc->dev) != link ||
|
|
((qc->flags & ATA_QCFLAG_QUIET) &&
|
|
qc->err_mask == AC_ERR_DEV))
|
|
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";
|
|
|
|
memset(tries_buf, 0, sizeof(tries_buf));
|
|
if (ap->eh_tries < ATA_EH_MAX_TRIES)
|
|
snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d",
|
|
ap->eh_tries);
|
|
|
|
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%s\n",
|
|
ehc->i.err_mask, link->sactive, ehc->i.serror,
|
|
ehc->i.action, frozen, tries_buf);
|
|
if (desc)
|
|
ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc);
|
|
} else {
|
|
ata_link_printk(link, KERN_ERR, "exception Emask 0x%x "
|
|
"SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
|
|
ehc->i.err_mask, link->sactive, ehc->i.serror,
|
|
ehc->i.action, frozen, tries_buf);
|
|
if (desc)
|
|
ata_link_printk(link, KERN_ERR, "%s\n", desc);
|
|
}
|
|
|
|
if (ehc->i.serror)
|
|
ata_link_printk(link, KERN_ERR,
|
|
"SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
|
|
ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
|
|
ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
|
|
ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
|
|
ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
|
|
ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
|
|
ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
|
|
ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
|
|
ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
|
|
ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
|
|
ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
|
|
ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
|
|
ehc->i.serror & SERR_CRC ? "BadCRC " : "",
|
|
ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
|
|
ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
|
|
ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
|
|
ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
|
|
ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
|
|
|
|
for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
|
|
struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
|
|
struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
|
|
const u8 *cdb = qc->cdb;
|
|
char data_buf[20] = "";
|
|
char cdb_buf[70] = "";
|
|
|
|
if (!(qc->flags & ATA_QCFLAG_FAILED) ||
|
|
ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
|
|
continue;
|
|
|
|
if (qc->dma_dir != DMA_NONE) {
|
|
static const char *dma_str[] = {
|
|
[DMA_BIDIRECTIONAL] = "bidi",
|
|
[DMA_TO_DEVICE] = "out",
|
|
[DMA_FROM_DEVICE] = "in",
|
|
};
|
|
static const char *prot_str[] = {
|
|
[ATA_PROT_PIO] = "pio",
|
|
[ATA_PROT_DMA] = "dma",
|
|
[ATA_PROT_NCQ] = "ncq",
|
|
[ATAPI_PROT_PIO] = "pio",
|
|
[ATAPI_PROT_DMA] = "dma",
|
|
};
|
|
|
|
snprintf(data_buf, sizeof(data_buf), " %s %u %s",
|
|
prot_str[qc->tf.protocol], qc->nbytes,
|
|
dma_str[qc->dma_dir]);
|
|
}
|
|
|
|
if (ata_is_atapi(qc->tf.protocol))
|
|
snprintf(cdb_buf, sizeof(cdb_buf),
|
|
"cdb %02x %02x %02x %02x %02x %02x %02x %02x "
|
|
"%02x %02x %02x %02x %02x %02x %02x %02x\n ",
|
|
cdb[0], cdb[1], cdb[2], cdb[3],
|
|
cdb[4], cdb[5], cdb[6], cdb[7],
|
|
cdb[8], cdb[9], cdb[10], cdb[11],
|
|
cdb[12], cdb[13], cdb[14], cdb[15]);
|
|
|
|
ata_dev_printk(qc->dev, KERN_ERR,
|
|
"cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
|
|
"tag %d%s\n %s"
|
|
"res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
|
|
"Emask 0x%x (%s)%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, data_buf, cdb_buf,
|
|
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),
|
|
qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
|
|
|
|
if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
|
|
ATA_ERR)) {
|
|
if (res->command & ATA_BUSY)
|
|
ata_dev_printk(qc->dev, KERN_ERR,
|
|
"status: { Busy }\n");
|
|
else
|
|
ata_dev_printk(qc->dev, KERN_ERR,
|
|
"status: { %s%s%s%s}\n",
|
|
res->command & ATA_DRDY ? "DRDY " : "",
|
|
res->command & ATA_DF ? "DF " : "",
|
|
res->command & ATA_DRQ ? "DRQ " : "",
|
|
res->command & ATA_ERR ? "ERR " : "");
|
|
}
|
|
|
|
if (cmd->command != ATA_CMD_PACKET &&
|
|
(res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF |
|
|
ATA_ABORTED)))
|
|
ata_dev_printk(qc->dev, KERN_ERR,
|
|
"error: { %s%s%s%s}\n",
|
|
res->feature & ATA_ICRC ? "ICRC " : "",
|
|
res->feature & ATA_UNC ? "UNC " : "",
|
|
res->feature & ATA_IDNF ? "IDNF " : "",
|
|
res->feature & ATA_ABORTED ? "ABRT " : "");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ata_eh_report - report error handling to user
|
|
* @ap: ATA port to report EH about
|
|
*
|
|
* Report EH to user.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
void ata_eh_report(struct ata_port *ap)
|
|
{
|
|
struct ata_link *link;
|
|
|
|
ata_for_each_link(link, ap, HOST_FIRST)
|
|
ata_eh_link_report(link);
|
|
}
|
|
|
|
static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
|
|
unsigned int *classes, unsigned long deadline,
|
|
bool clear_classes)
|
|
{
|
|
struct ata_device *dev;
|
|
|
|
if (clear_classes)
|
|
ata_for_each_dev(dev, link, ALL)
|
|
classes[dev->devno] = ATA_DEV_UNKNOWN;
|
|
|
|
return reset(link, classes, deadline);
|
|
}
|
|
|
|
static int ata_eh_followup_srst_needed(struct ata_link *link,
|
|
int rc, const unsigned int *classes)
|
|
{
|
|
if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
|
|
return 0;
|
|
if (rc == -EAGAIN)
|
|
return 1;
|
|
if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
int ata_eh_reset(struct ata_link *link, int classify,
|
|
ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
|
|
ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_link *slave = ap->slave_link;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_eh_context *sehc = &slave->eh_context;
|
|
unsigned int *classes = ehc->classes;
|
|
unsigned int lflags = link->flags;
|
|
int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
|
|
int max_tries = 0, try = 0;
|
|
struct ata_link *failed_link;
|
|
struct ata_device *dev;
|
|
unsigned long deadline, now;
|
|
ata_reset_fn_t reset;
|
|
unsigned long flags;
|
|
u32 sstatus;
|
|
int nr_unknown, rc;
|
|
|
|
/*
|
|
* Prepare to reset
|
|
*/
|
|
while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
|
|
max_tries++;
|
|
if (link->flags & ATA_LFLAG_NO_HRST)
|
|
hardreset = NULL;
|
|
if (link->flags & ATA_LFLAG_NO_SRST)
|
|
softreset = NULL;
|
|
|
|
/* make sure each reset attemp is at least COOL_DOWN apart */
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET) {
|
|
now = jiffies;
|
|
WARN_ON(time_after(ehc->last_reset, now));
|
|
deadline = ata_deadline(ehc->last_reset,
|
|
ATA_EH_RESET_COOL_DOWN);
|
|
if (time_before(now, deadline))
|
|
schedule_timeout_uninterruptible(deadline - now);
|
|
}
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ap->pflags |= ATA_PFLAG_RESETTING;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
|
|
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
/* If we issue an SRST then an ATA drive (not ATAPI)
|
|
* may change configuration and be in PIO0 timing. If
|
|
* we do a hard reset (or are coming from power on)
|
|
* this is true for ATA or ATAPI. Until we've set a
|
|
* suitable controller mode we should not touch the
|
|
* bus as we may be talking too fast.
|
|
*/
|
|
dev->pio_mode = XFER_PIO_0;
|
|
|
|
/* If the controller has a pio mode setup function
|
|
* then use it to set the chipset to rights. Don't
|
|
* touch the DMA setup as that will be dealt with when
|
|
* configuring devices.
|
|
*/
|
|
if (ap->ops->set_piomode)
|
|
ap->ops->set_piomode(ap, dev);
|
|
}
|
|
|
|
/* prefer hardreset */
|
|
reset = NULL;
|
|
ehc->i.action &= ~ATA_EH_RESET;
|
|
if (hardreset) {
|
|
reset = hardreset;
|
|
ehc->i.action |= ATA_EH_HARDRESET;
|
|
} else if (softreset) {
|
|
reset = softreset;
|
|
ehc->i.action |= ATA_EH_SOFTRESET;
|
|
}
|
|
|
|
if (prereset) {
|
|
unsigned long deadline = ata_deadline(jiffies,
|
|
ATA_EH_PRERESET_TIMEOUT);
|
|
|
|
if (slave) {
|
|
sehc->i.action &= ~ATA_EH_RESET;
|
|
sehc->i.action |= ehc->i.action;
|
|
}
|
|
|
|
rc = prereset(link, deadline);
|
|
|
|
/* If present, do prereset on slave link too. Reset
|
|
* is skipped iff both master and slave links report
|
|
* -ENOENT or clear ATA_EH_RESET.
|
|
*/
|
|
if (slave && (rc == 0 || rc == -ENOENT)) {
|
|
int tmp;
|
|
|
|
tmp = prereset(slave, deadline);
|
|
if (tmp != -ENOENT)
|
|
rc = tmp;
|
|
|
|
ehc->i.action |= sehc->i.action;
|
|
}
|
|
|
|
if (rc) {
|
|
if (rc == -ENOENT) {
|
|
ata_link_printk(link, KERN_DEBUG,
|
|
"port disabled. ignoring.\n");
|
|
ehc->i.action &= ~ATA_EH_RESET;
|
|
|
|
ata_for_each_dev(dev, link, ALL)
|
|
classes[dev->devno] = ATA_DEV_NONE;
|
|
|
|
rc = 0;
|
|
} else
|
|
ata_link_printk(link, KERN_ERR,
|
|
"prereset failed (errno=%d)\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
/* prereset() might have cleared ATA_EH_RESET. If so,
|
|
* bang classes and return.
|
|
*/
|
|
if (reset && !(ehc->i.action & ATA_EH_RESET)) {
|
|
ata_for_each_dev(dev, link, ALL)
|
|
classes[dev->devno] = ATA_DEV_NONE;
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
retry:
|
|
/*
|
|
* Perform reset
|
|
*/
|
|
if (ata_is_host_link(link))
|
|
ata_eh_freeze_port(ap);
|
|
|
|
deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
|
|
|
|
if (reset) {
|
|
if (verbose)
|
|
ata_link_printk(link, KERN_INFO, "%s resetting link\n",
|
|
reset == softreset ? "soft" : "hard");
|
|
|
|
/* mark that this EH session started with reset */
|
|
ehc->last_reset = jiffies;
|
|
if (reset == hardreset)
|
|
ehc->i.flags |= ATA_EHI_DID_HARDRESET;
|
|
else
|
|
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
|
|
|
|
rc = ata_do_reset(link, reset, classes, deadline, true);
|
|
if (rc && rc != -EAGAIN) {
|
|
failed_link = link;
|
|
goto fail;
|
|
}
|
|
|
|
/* hardreset slave link if existent */
|
|
if (slave && reset == hardreset) {
|
|
int tmp;
|
|
|
|
if (verbose)
|
|
ata_link_printk(slave, KERN_INFO,
|
|
"hard resetting link\n");
|
|
|
|
ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
|
|
tmp = ata_do_reset(slave, reset, classes, deadline,
|
|
false);
|
|
switch (tmp) {
|
|
case -EAGAIN:
|
|
rc = -EAGAIN;
|
|
case 0:
|
|
break;
|
|
default:
|
|
failed_link = slave;
|
|
rc = tmp;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* perform follow-up SRST if necessary */
|
|
if (reset == hardreset &&
|
|
ata_eh_followup_srst_needed(link, rc, classes)) {
|
|
reset = softreset;
|
|
|
|
if (!reset) {
|
|
ata_link_printk(link, KERN_ERR,
|
|
"follow-up softreset required "
|
|
"but no softreset avaliable\n");
|
|
failed_link = link;
|
|
rc = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
|
|
rc = ata_do_reset(link, reset, classes, deadline, true);
|
|
}
|
|
} else {
|
|
if (verbose)
|
|
ata_link_printk(link, KERN_INFO, "no reset method "
|
|
"available, skipping reset\n");
|
|
if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
|
|
lflags |= ATA_LFLAG_ASSUME_ATA;
|
|
}
|
|
|
|
/*
|
|
* Post-reset processing
|
|
*/
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
/* After the reset, the device state is PIO 0 and the
|
|
* controller state is undefined. Reset also wakes up
|
|
* drives from sleeping mode.
|
|
*/
|
|
dev->pio_mode = XFER_PIO_0;
|
|
dev->flags &= ~ATA_DFLAG_SLEEPING;
|
|
|
|
if (!ata_phys_link_offline(ata_dev_phys_link(dev))) {
|
|
/* apply class override */
|
|
if (lflags & ATA_LFLAG_ASSUME_ATA)
|
|
classes[dev->devno] = ATA_DEV_ATA;
|
|
else if (lflags & ATA_LFLAG_ASSUME_SEMB)
|
|
classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
|
|
} else
|
|
classes[dev->devno] = ATA_DEV_NONE;
|
|
}
|
|
|
|
/* record current link speed */
|
|
if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
|
|
link->sata_spd = (sstatus >> 4) & 0xf;
|
|
if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
|
|
slave->sata_spd = (sstatus >> 4) & 0xf;
|
|
|
|
/* thaw the port */
|
|
if (ata_is_host_link(link))
|
|
ata_eh_thaw_port(ap);
|
|
|
|
/* postreset() should clear hardware SError. Although SError
|
|
* is cleared during link resume, clearing SError here is
|
|
* necessary as some PHYs raise hotplug events after SRST.
|
|
* This introduces race condition where hotplug occurs between
|
|
* reset and here. This race is mediated by cross checking
|
|
* link onlineness and classification result later.
|
|
*/
|
|
if (postreset) {
|
|
postreset(link, classes);
|
|
if (slave)
|
|
postreset(slave, classes);
|
|
}
|
|
|
|
/* clear cached SError */
|
|
spin_lock_irqsave(link->ap->lock, flags);
|
|
link->eh_info.serror = 0;
|
|
if (slave)
|
|
slave->eh_info.serror = 0;
|
|
spin_unlock_irqrestore(link->ap->lock, flags);
|
|
|
|
/* Make sure onlineness and classification result correspond.
|
|
* Hotplug could have happened during reset and some
|
|
* controllers fail to wait while a drive is spinning up after
|
|
* being hotplugged causing misdetection. By cross checking
|
|
* link onlineness and classification result, those conditions
|
|
* can be reliably detected and retried.
|
|
*/
|
|
nr_unknown = 0;
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
/* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
|
|
if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
|
|
classes[dev->devno] = ATA_DEV_NONE;
|
|
if (ata_phys_link_online(ata_dev_phys_link(dev)))
|
|
nr_unknown++;
|
|
}
|
|
}
|
|
|
|
if (classify && nr_unknown) {
|
|
if (try < max_tries) {
|
|
ata_link_printk(link, KERN_WARNING, "link online but "
|
|
"device misclassified, retrying\n");
|
|
failed_link = link;
|
|
rc = -EAGAIN;
|
|
goto fail;
|
|
}
|
|
ata_link_printk(link, KERN_WARNING,
|
|
"link online but device misclassified, "
|
|
"device detection might fail\n");
|
|
}
|
|
|
|
/* reset successful, schedule revalidation */
|
|
ata_eh_done(link, NULL, ATA_EH_RESET);
|
|
if (slave)
|
|
ata_eh_done(slave, NULL, ATA_EH_RESET);
|
|
ehc->last_reset = jiffies; /* update to completion time */
|
|
ehc->i.action |= ATA_EH_REVALIDATE;
|
|
|
|
rc = 0;
|
|
out:
|
|
/* clear hotplug flag */
|
|
ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
|
|
if (slave)
|
|
sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
ap->pflags &= ~ATA_PFLAG_RESETTING;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
|
|
return rc;
|
|
|
|
fail:
|
|
/* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
|
|
if (!ata_is_host_link(link) &&
|
|
sata_scr_read(link, SCR_STATUS, &sstatus))
|
|
rc = -ERESTART;
|
|
|
|
if (rc == -ERESTART || try >= max_tries)
|
|
goto out;
|
|
|
|
now = jiffies;
|
|
if (time_before(now, deadline)) {
|
|
unsigned long delta = deadline - now;
|
|
|
|
ata_link_printk(failed_link, KERN_WARNING,
|
|
"reset failed (errno=%d), retrying in %u secs\n",
|
|
rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
|
|
|
|
while (delta)
|
|
delta = schedule_timeout_uninterruptible(delta);
|
|
}
|
|
|
|
if (try == max_tries - 1) {
|
|
sata_down_spd_limit(link);
|
|
if (slave)
|
|
sata_down_spd_limit(slave);
|
|
} else if (rc == -EPIPE)
|
|
sata_down_spd_limit(failed_link);
|
|
|
|
if (hardreset)
|
|
reset = hardreset;
|
|
goto retry;
|
|
}
|
|
|
|
static inline void ata_eh_pull_park_action(struct ata_port *ap)
|
|
{
|
|
struct ata_link *link;
|
|
struct ata_device *dev;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* This function can be thought of as an extended version of
|
|
* ata_eh_about_to_do() specially crafted to accommodate the
|
|
* requirements of ATA_EH_PARK handling. Since the EH thread
|
|
* does not leave the do {} while () loop in ata_eh_recover as
|
|
* long as the timeout for a park request to *one* device on
|
|
* the port has not expired, and since we still want to pick
|
|
* up park requests to other devices on the same port or
|
|
* timeout updates for the same device, we have to pull
|
|
* ATA_EH_PARK actions from eh_info into eh_context.i
|
|
* ourselves at the beginning of each pass over the loop.
|
|
*
|
|
* Additionally, all write accesses to &ap->park_req_pending
|
|
* through INIT_COMPLETION() (see below) or complete_all()
|
|
* (see ata_scsi_park_store()) are protected by the host lock.
|
|
* As a result we have that park_req_pending.done is zero on
|
|
* exit from this function, i.e. when ATA_EH_PARK actions for
|
|
* *all* devices on port ap have been pulled into the
|
|
* respective eh_context structs. If, and only if,
|
|
* park_req_pending.done is non-zero by the time we reach
|
|
* wait_for_completion_timeout(), another ATA_EH_PARK action
|
|
* has been scheduled for at least one of the devices on port
|
|
* ap and we have to cycle over the do {} while () loop in
|
|
* ata_eh_recover() again.
|
|
*/
|
|
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
INIT_COMPLETION(ap->park_req_pending);
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
struct ata_eh_info *ehi = &link->eh_info;
|
|
|
|
link->eh_context.i.dev_action[dev->devno] |=
|
|
ehi->dev_action[dev->devno] & ATA_EH_PARK;
|
|
ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
}
|
|
|
|
static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
|
|
{
|
|
struct ata_eh_context *ehc = &dev->link->eh_context;
|
|
struct ata_taskfile tf;
|
|
unsigned int err_mask;
|
|
|
|
ata_tf_init(dev, &tf);
|
|
if (park) {
|
|
ehc->unloaded_mask |= 1 << dev->devno;
|
|
tf.command = ATA_CMD_IDLEIMMEDIATE;
|
|
tf.feature = 0x44;
|
|
tf.lbal = 0x4c;
|
|
tf.lbam = 0x4e;
|
|
tf.lbah = 0x55;
|
|
} else {
|
|
ehc->unloaded_mask &= ~(1 << dev->devno);
|
|
tf.command = ATA_CMD_CHK_POWER;
|
|
}
|
|
|
|
tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
|
|
tf.protocol |= ATA_PROT_NODATA;
|
|
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
|
|
if (park && (err_mask || tf.lbal != 0xc4)) {
|
|
ata_dev_printk(dev, KERN_ERR, "head unload failed!\n");
|
|
ehc->unloaded_mask &= ~(1 << dev->devno);
|
|
}
|
|
}
|
|
|
|
static int ata_eh_revalidate_and_attach(struct ata_link *link,
|
|
struct ata_device **r_failed_dev)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_device *dev;
|
|
unsigned int new_mask = 0;
|
|
unsigned long flags;
|
|
int 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.
|
|
*/
|
|
ata_for_each_dev(dev, link, ALL_REVERSE) {
|
|
unsigned int action = ata_eh_dev_action(dev);
|
|
unsigned int readid_flags = 0;
|
|
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET)
|
|
readid_flags |= ATA_READID_POSTRESET;
|
|
|
|
if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
|
|
WARN_ON(dev->class == ATA_DEV_PMP);
|
|
|
|
if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
|
|
rc = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
|
|
rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
|
|
readid_flags);
|
|
if (rc)
|
|
goto err;
|
|
|
|
ata_eh_done(link, 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];
|
|
|
|
if (dev->class == ATA_DEV_PMP)
|
|
rc = sata_pmp_attach(dev);
|
|
else
|
|
rc = ata_dev_read_id(dev, &dev->class,
|
|
readid_flags, dev->id);
|
|
switch (rc) {
|
|
case 0:
|
|
new_mask |= 1 << dev->devno;
|
|
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) && ata_is_host_link(link)) {
|
|
if (ap->ops->cable_detect)
|
|
ap->cbl = ap->ops->cable_detect(ap);
|
|
ata_force_cbl(ap);
|
|
}
|
|
|
|
/* Configure new devices forward such that user doesn't see
|
|
* device detection messages backwards.
|
|
*/
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
if (!(new_mask & (1 << dev->devno)) ||
|
|
dev->class == ATA_DEV_PMP)
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* ata_set_mode - Program timings and issue SET FEATURES - XFER
|
|
* @link: link on which timings will be programmed
|
|
* @r_failed_dev: out paramter for failed device
|
|
*
|
|
* Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
|
|
* ata_set_mode() fails, pointer to the failing device is
|
|
* returned in @r_failed_dev.
|
|
*
|
|
* LOCKING:
|
|
* PCI/etc. bus probe sem.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, negative errno otherwise
|
|
*/
|
|
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_device *dev;
|
|
int rc;
|
|
|
|
/* if data transfer is verified, clear DUBIOUS_XFER on ering top */
|
|
ata_for_each_dev(dev, link, ENABLED) {
|
|
if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
|
|
struct ata_ering_entry *ent;
|
|
|
|
ent = ata_ering_top(&dev->ering);
|
|
if (ent)
|
|
ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
|
|
}
|
|
}
|
|
|
|
/* has private set_mode? */
|
|
if (ap->ops->set_mode)
|
|
rc = ap->ops->set_mode(link, r_failed_dev);
|
|
else
|
|
rc = ata_do_set_mode(link, r_failed_dev);
|
|
|
|
/* if transfer mode has changed, set DUBIOUS_XFER on device */
|
|
ata_for_each_dev(dev, link, ENABLED) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
|
|
u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
|
|
|
|
if (dev->xfer_mode != saved_xfer_mode ||
|
|
ata_ncq_enabled(dev) != saved_ncq)
|
|
dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
|
|
* @dev: ATAPI device to clear UA for
|
|
*
|
|
* Resets and other operations can make an ATAPI device raise
|
|
* UNIT ATTENTION which causes the next operation to fail. This
|
|
* function clears UA.
|
|
*
|
|
* LOCKING:
|
|
* EH context (may sleep).
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, -errno on failure.
|
|
*/
|
|
static int atapi_eh_clear_ua(struct ata_device *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ATA_EH_UA_TRIES; i++) {
|
|
u8 sense_buffer[SCSI_SENSE_BUFFERSIZE];
|
|
u8 sense_key = 0;
|
|
unsigned int err_mask;
|
|
|
|
err_mask = atapi_eh_tur(dev, &sense_key);
|
|
if (err_mask != 0 && err_mask != AC_ERR_DEV) {
|
|
ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY "
|
|
"failed (err_mask=0x%x)\n", err_mask);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!err_mask || sense_key != UNIT_ATTENTION)
|
|
return 0;
|
|
|
|
err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
|
|
if (err_mask) {
|
|
ata_dev_printk(dev, KERN_WARNING, "failed to clear "
|
|
"UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
ata_dev_printk(dev, KERN_WARNING,
|
|
"UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ata_link_nr_enabled(struct ata_link *link)
|
|
{
|
|
struct ata_device *dev;
|
|
int cnt = 0;
|
|
|
|
ata_for_each_dev(dev, link, ENABLED)
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
static int ata_link_nr_vacant(struct ata_link *link)
|
|
{
|
|
struct ata_device *dev;
|
|
int cnt = 0;
|
|
|
|
ata_for_each_dev(dev, link, ALL)
|
|
if (dev->class == ATA_DEV_UNKNOWN)
|
|
cnt++;
|
|
return cnt;
|
|
}
|
|
|
|
static int ata_eh_skip_recovery(struct ata_link *link)
|
|
{
|
|
struct ata_port *ap = link->ap;
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
struct ata_device *dev;
|
|
|
|
/* skip disabled links */
|
|
if (link->flags & ATA_LFLAG_DISABLED)
|
|
return 1;
|
|
|
|
/* thaw frozen port and recover failed devices */
|
|
if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
|
|
return 0;
|
|
|
|
/* reset at least once if reset is requested */
|
|
if ((ehc->i.action & ATA_EH_RESET) &&
|
|
!(ehc->i.flags & ATA_EHI_DID_RESET))
|
|
return 0;
|
|
|
|
/* skip if class codes for all vacant slots are ATA_DEV_NONE */
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
if (dev->class == ATA_DEV_UNKNOWN &&
|
|
ehc->classes[dev->devno] != ATA_DEV_NONE)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ata_eh_schedule_probe(struct ata_device *dev)
|
|
{
|
|
struct ata_eh_context *ehc = &dev->link->eh_context;
|
|
|
|
if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
|
|
(ehc->did_probe_mask & (1 << dev->devno)))
|
|
return 0;
|
|
|
|
ata_eh_detach_dev(dev);
|
|
ata_dev_init(dev);
|
|
ehc->did_probe_mask |= (1 << dev->devno);
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
ehc->saved_xfer_mode[dev->devno] = 0;
|
|
ehc->saved_ncq_enabled &= ~(1 << dev->devno);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
|
|
{
|
|
struct ata_eh_context *ehc = &dev->link->eh_context;
|
|
|
|
ehc->tries[dev->devno]--;
|
|
|
|
switch (err) {
|
|
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 && dev->pio_mode > XFER_PIO_0) {
|
|
/* This is the last chance, better to slow
|
|
* down than lose it.
|
|
*/
|
|
sata_down_spd_limit(ata_dev_phys_link(dev));
|
|
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_phys_link_offline(ata_dev_phys_link(dev)))
|
|
ata_eh_detach_dev(dev);
|
|
|
|
/* schedule probe if necessary */
|
|
if (ata_eh_schedule_probe(dev)) {
|
|
ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
|
|
memset(ehc->cmd_timeout_idx[dev->devno], 0,
|
|
sizeof(ehc->cmd_timeout_idx[dev->devno]));
|
|
}
|
|
|
|
return 1;
|
|
} else {
|
|
ehc->i.action |= ATA_EH_RESET;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
* @r_failed_link: out parameter for failed link
|
|
*
|
|
* This is the alpha and omega, eum and yang, heart and soul of
|
|
* libata exception handling. On entry, actions required to
|
|
* recover each link and hotplug requests are recorded in the
|
|
* link's 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.
|
|
*/
|
|
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_link **r_failed_link)
|
|
{
|
|
struct ata_link *link;
|
|
struct ata_device *dev;
|
|
int nr_failed_devs;
|
|
int rc;
|
|
unsigned long flags, deadline;
|
|
|
|
DPRINTK("ENTER\n");
|
|
|
|
/* prep for recovery */
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
|
|
/* re-enable link? */
|
|
if (ehc->i.action & ATA_EH_ENABLE_LINK) {
|
|
ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
link->flags &= ~ATA_LFLAG_DISABLED;
|
|
spin_unlock_irqrestore(ap->lock, flags);
|
|
ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
|
|
}
|
|
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
if (link->flags & ATA_LFLAG_NO_RETRY)
|
|
ehc->tries[dev->devno] = 1;
|
|
else
|
|
ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
|
|
|
|
/* collect port action mask recorded in dev actions */
|
|
ehc->i.action |= ehc->i.dev_action[dev->devno] &
|
|
~ATA_EH_PERDEV_MASK;
|
|
ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
|
|
|
|
/* process hotplug request */
|
|
if (dev->flags & ATA_DFLAG_DETACH)
|
|
ata_eh_detach_dev(dev);
|
|
|
|
/* schedule probe if necessary */
|
|
if (!ata_dev_enabled(dev))
|
|
ata_eh_schedule_probe(dev);
|
|
}
|
|
}
|
|
|
|
retry:
|
|
rc = 0;
|
|
nr_failed_devs = 0;
|
|
|
|
/* if UNLOADING, finish immediately */
|
|
if (ap->pflags & ATA_PFLAG_UNLOADING)
|
|
goto out;
|
|
|
|
/* prep for EH */
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
|
|
/* skip EH if possible. */
|
|
if (ata_eh_skip_recovery(link))
|
|
ehc->i.action = 0;
|
|
|
|
ata_for_each_dev(dev, link, ALL)
|
|
ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
|
|
}
|
|
|
|
/* reset */
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
|
|
if (!(ehc->i.action & ATA_EH_RESET))
|
|
continue;
|
|
|
|
rc = ata_eh_reset(link, ata_link_nr_vacant(link),
|
|
prereset, softreset, hardreset, postreset);
|
|
if (rc) {
|
|
ata_link_printk(link, KERN_ERR,
|
|
"reset failed, giving up\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
do {
|
|
unsigned long now;
|
|
|
|
/*
|
|
* clears ATA_EH_PARK in eh_info and resets
|
|
* ap->park_req_pending
|
|
*/
|
|
ata_eh_pull_park_action(ap);
|
|
|
|
deadline = jiffies;
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
unsigned long tmp;
|
|
|
|
if (dev->class != ATA_DEV_ATA)
|
|
continue;
|
|
if (!(ehc->i.dev_action[dev->devno] &
|
|
ATA_EH_PARK))
|
|
continue;
|
|
tmp = dev->unpark_deadline;
|
|
if (time_before(deadline, tmp))
|
|
deadline = tmp;
|
|
else if (time_before_eq(tmp, jiffies))
|
|
continue;
|
|
if (ehc->unloaded_mask & (1 << dev->devno))
|
|
continue;
|
|
|
|
ata_eh_park_issue_cmd(dev, 1);
|
|
}
|
|
}
|
|
|
|
now = jiffies;
|
|
if (time_before_eq(deadline, now))
|
|
break;
|
|
|
|
deadline = wait_for_completion_timeout(&ap->park_req_pending,
|
|
deadline - now);
|
|
} while (deadline);
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
if (!(link->eh_context.unloaded_mask &
|
|
(1 << dev->devno)))
|
|
continue;
|
|
|
|
ata_eh_park_issue_cmd(dev, 0);
|
|
ata_eh_done(link, dev, ATA_EH_PARK);
|
|
}
|
|
}
|
|
|
|
/* the rest */
|
|
ata_for_each_link(link, ap, EDGE) {
|
|
struct ata_eh_context *ehc = &link->eh_context;
|
|
|
|
/* revalidate existing devices and attach new ones */
|
|
rc = ata_eh_revalidate_and_attach(link, &dev);
|
|
if (rc)
|
|
goto dev_fail;
|
|
|
|
/* if PMP got attached, return, pmp EH will take care of it */
|
|
if (link->device->class == ATA_DEV_PMP) {
|
|
ehc->i.action = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* configure transfer mode if necessary */
|
|
if (ehc->i.flags & ATA_EHI_SETMODE) {
|
|
rc = ata_set_mode(link, &dev);
|
|
if (rc)
|
|
goto dev_fail;
|
|
ehc->i.flags &= ~ATA_EHI_SETMODE;
|
|
}
|
|
|
|
/* If reset has been issued, clear UA to avoid
|
|
* disrupting the current users of the device.
|
|
*/
|
|
if (ehc->i.flags & ATA_EHI_DID_RESET) {
|
|
ata_for_each_dev(dev, link, ALL) {
|
|
if (dev->class != ATA_DEV_ATAPI)
|
|
continue;
|
|
rc = atapi_eh_clear_ua(dev);
|
|
if (rc)
|
|
goto dev_fail;
|
|
}
|
|
}
|
|
|
|
/* configure link power saving */
|
|
if (ehc->i.action & ATA_EH_LPM)
|
|
ata_for_each_dev(dev, link, ALL)
|
|
ata_dev_enable_pm(dev, ap->pm_policy);
|
|
|
|
/* this link is okay now */
|
|
ehc->i.flags = 0;
|
|
continue;
|
|
|
|
dev_fail:
|
|
nr_failed_devs++;
|
|
ata_eh_handle_dev_fail(dev, rc);
|
|
|
|
if (ap->pflags & ATA_PFLAG_FROZEN) {
|
|
/* PMP reset requires working host port.
|
|
* Can't retry if it's frozen.
|
|
*/
|
|
if (sata_pmp_attached(ap))
|
|
goto out;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (nr_failed_devs)
|
|
goto retry;
|
|
|
|
out:
|
|
if (rc && r_failed_link)
|
|
*r_failed_link = link;
|
|
|
|
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.
|
|
*/
|
|
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->flags & ATA_QCFLAG_RETRY)
|
|
ata_eh_qc_retry(qc);
|
|
else
|
|
ata_eh_qc_complete(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);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* make sure nr_active_links is zero after EH */
|
|
WARN_ON(ap->nr_active_links);
|
|
ap->nr_active_links = 0;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct ata_device *dev;
|
|
int rc;
|
|
|
|
ata_eh_autopsy(ap);
|
|
ata_eh_report(ap);
|
|
|
|
rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
|
|
NULL);
|
|
if (rc) {
|
|
ata_for_each_dev(dev, &ap->link, ALL)
|
|
ata_dev_disable(dev);
|
|
}
|
|
|
|
ata_eh_finish(ap);
|
|
}
|
|
|
|
/**
|
|
* ata_std_error_handler - standard error handler
|
|
* @ap: host port to handle error for
|
|
*
|
|
* Standard error handler
|
|
*
|
|
* LOCKING:
|
|
* Kernel thread context (may sleep).
|
|
*/
|
|
void ata_std_error_handler(struct ata_port *ap)
|
|
{
|
|
struct ata_port_operations *ops = ap->ops;
|
|
ata_reset_fn_t hardreset = ops->hardreset;
|
|
|
|
/* ignore built-in hardreset if SCR access is not available */
|
|
if (ata_is_builtin_hardreset(hardreset) && !sata_scr_valid(&ap->link))
|
|
hardreset = NULL;
|
|
|
|
ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
|
|
}
|
|
|
|
#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);
|
|
|
|
/* tell ACPI we're suspending */
|
|
rc = ata_acpi_on_suspend(ap);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* suspend */
|
|
ata_eh_freeze_port(ap);
|
|
|
|
if (ap->ops->port_suspend)
|
|
rc = ap->ops->port_suspend(ap, ap->pm_mesg);
|
|
|
|
ata_acpi_set_state(ap, PMSG_SUSPEND);
|
|
out:
|
|
/* report result */
|
|
spin_lock_irqsave(ap->lock, flags);
|
|
|
|
ap->pflags &= ~ATA_PFLAG_PM_PENDING;
|
|
if (rc == 0)
|
|
ap->pflags |= ATA_PFLAG_SUSPENDED;
|
|
else if (ap->pflags & ATA_PFLAG_FROZEN)
|
|
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));
|
|
|
|
ata_acpi_set_state(ap, PMSG_ON);
|
|
|
|
if (ap->ops->port_resume)
|
|
rc = ap->ops->port_resume(ap);
|
|
|
|
/* tell ACPI that we're resuming */
|
|
ata_acpi_on_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 */
|