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linux/drivers/ata/libata-eh.c
Niklas Cassel e5dd410acb ata: libata: Clear DID_TIME_OUT for ATA PT commands with sense data 
When ata_qc_complete() schedules a command for EH using
ata_qc_schedule_eh(), blk_abort_request() will be called, which leads to
req->q->mq_ops->timeout() / scsi_timeout() being called.

scsi_timeout(), if the LLDD has no abort handler (libata has no abort
handler), will set host byte to DID_TIME_OUT, and then call
scsi_eh_scmd_add() to add the command to EH.

Thus, when commands first enter libata's EH strategy_handler, all the
commands that have been added to EH will have DID_TIME_OUT set.

libata has its own flag (AC_ERR_TIMEOUT), that it sets for commands that
have not received a completion at the time of entering EH.

Thus, libata doesn't really care about DID_TIME_OUT at all, and currently
clears the host byte at the end of EH, in ata_scsi_qc_complete(), before
scsi_eh_finish_cmd() is called.

However, this clearing in ata_scsi_qc_complete() is currently only done
for commands that are not ATA passthrough commands.

Since the host byte is visible in the completion that we return to user
space for ATA passthrough commands, for ATA passthrough commands that got
completed via EH (commands with sense data), the user will incorrectly see:
ATA pass-through(16): transport error: Host_status=0x03 [DID_TIME_OUT]

Fix this by moving the clearing of the host byte (which is currently only
done for commands that are not ATA passthrough commands) from
ata_scsi_qc_complete() to the start of EH (regardless if the command is
ATA passthrough or not).

While at it, use the proper helper function to clear the host byte, rather
than open coding the clearing.

This will make sure that we:
-Correctly clear DID_TIME_OUT for both ATA passthrough commands and
 commands that are not ATA passthrough commands.
-Do not needlessly clear the host byte for commands that did not go via EH.
 ata_scsi_qc_complete() is called both for commands that are completed
 normally (without going via EH), and for commands that went via EH,
 however, only commands that went via EH will have DID_TIME_OUT set.

Fixes: 24aeebbf8e ("scsi: ata: libata: Change ata_eh_request_sense() to not set CHECK_CONDITION")
Reported-by: Igor Pylypiv <ipylypiv@google.com>
Closes: https://lore.kernel.org/linux-ide/ZttIN8He8TOZ7Lct@google.com/
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Tested-by: Igor Pylypiv <ipylypiv@google.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
2024-09-11 08:03:43 +09:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* libata-eh.c - libata error handling
*
* Copyright 2006 Tejun Heo <htejun@gmail.com>
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/driver-api/libata.rst
*
* Hardware documentation available from http://www.t13.org/ and
* http://www.sata-io.org/
*/
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include "../scsi/scsi_transport_api.h"
#include <linux/libata.h>
#include <trace/events/libata.h>
#include "libata.h"
enum {
/* speed down verdicts */
ATA_EH_SPDN_NCQ_OFF = (1 << 0),
ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
/* error flags */
ATA_EFLAG_IS_IO = (1 << 0),
ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
ATA_EFLAG_OLD_ER = (1 << 31),
/* error categories */
ATA_ECAT_NONE = 0,
ATA_ECAT_ATA_BUS = 1,
ATA_ECAT_TOUT_HSM = 2,
ATA_ECAT_UNK_DEV = 3,
ATA_ECAT_DUBIOUS_NONE = 4,
ATA_ECAT_DUBIOUS_ATA_BUS = 5,
ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
ATA_ECAT_DUBIOUS_UNK_DEV = 7,
ATA_ECAT_NR = 8,
ATA_EH_CMD_DFL_TIMEOUT = 5000,
/* always put at least this amount of time between resets */
ATA_EH_RESET_COOL_DOWN = 5000,
/* Waiting in ->prereset can never be reliable. It's
* sometimes nice to wait there but it can't be depended upon;
* otherwise, we wouldn't be resetting. Just give it enough
* time for most drives to spin up.
*/
ATA_EH_PRERESET_TIMEOUT = 10000,
ATA_EH_FASTDRAIN_INTERVAL = 3000,
ATA_EH_UA_TRIES = 5,
/* probe speed down parameters, see ata_eh_schedule_probe() */
ATA_EH_PROBE_TRIAL_INTERVAL = 60000, /* 1 min */
ATA_EH_PROBE_TRIALS = 2,
};
/* The following table determines how we sequence resets. Each entry
* represents timeout for that try. The first try can be soft or
* hardreset. All others are hardreset if available. In most cases
* the first reset w/ 10sec timeout should succeed. Following entries
* are mostly for error handling, hotplug and those outlier devices that
* take an exceptionally long time to recover from reset.
*/
static const unsigned int ata_eh_reset_timeouts[] = {
10000, /* most drives spin up by 10sec */
10000, /* > 99% working drives spin up before 20sec */
35000, /* give > 30 secs of idleness for outlier devices */
5000, /* and sweet one last chance */
UINT_MAX, /* > 1 min has elapsed, give up */
};
static const unsigned int ata_eh_identify_timeouts[] = {
5000, /* covers > 99% of successes and not too boring on failures */
10000, /* combined time till here is enough even for media access */
30000, /* for true idiots */
UINT_MAX,
};
static const unsigned int ata_eh_revalidate_timeouts[] = {
15000, /* Some drives are slow to read log pages when waking-up */
15000, /* combined time till here is enough even for media access */
UINT_MAX,
};
static const unsigned int ata_eh_flush_timeouts[] = {
15000, /* be generous with flush */
15000, /* ditto */
30000, /* and even more generous */
UINT_MAX,
};
static const unsigned int ata_eh_other_timeouts[] = {
5000, /* same rationale as identify timeout */
10000, /* ditto */
/* but no merciful 30sec for other commands, it just isn't worth it */
UINT_MAX,
};
struct ata_eh_cmd_timeout_ent {
const u8 *commands;
const unsigned int *timeouts;
};
/* The following table determines timeouts to use for EH internal
* commands. Each table entry is a command class and matches the
* commands the entry applies to and the timeout table to use.
*
* On the retry after a command timed out, the next timeout value from
* the table is used. If the table doesn't contain further entries,
* the last value is used.
*
* ehc->cmd_timeout_idx keeps track of which timeout to use per
* command class, so if SET_FEATURES times out on the first try, the
* next try will use the second timeout value only for that class.
*/
#define CMDS(cmds...) (const u8 []){ cmds, 0 }
static const struct ata_eh_cmd_timeout_ent
ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
{ .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
.timeouts = ata_eh_identify_timeouts, },
{ .commands = CMDS(ATA_CMD_READ_LOG_EXT, ATA_CMD_READ_LOG_DMA_EXT),
.timeouts = ata_eh_revalidate_timeouts, },
{ .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
.timeouts = ata_eh_other_timeouts, },
{ .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
.timeouts = ata_eh_other_timeouts, },
{ .commands = CMDS(ATA_CMD_SET_FEATURES),
.timeouts = ata_eh_other_timeouts, },
{ .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
.timeouts = ata_eh_other_timeouts, },
{ .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
.timeouts = ata_eh_flush_timeouts },
{ .commands = CMDS(ATA_CMD_VERIFY),
.timeouts = ata_eh_reset_timeouts },
};
#undef CMDS
static void __ata_port_freeze(struct ata_port *ap);
static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
struct ata_device **r_failed_dev);
#ifdef CONFIG_PM
static void ata_eh_handle_port_suspend(struct ata_port *ap);
static void ata_eh_handle_port_resume(struct ata_port *ap);
#else /* CONFIG_PM */
static void ata_eh_handle_port_suspend(struct ata_port *ap)
{ }
static void ata_eh_handle_port_resume(struct ata_port *ap)
{ }
#endif /* CONFIG_PM */
static __printf(2, 0) void __ata_ehi_pushv_desc(struct ata_eh_info *ehi,
const char *fmt, va_list args)
{
ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
ATA_EH_DESC_LEN - ehi->desc_len,
fmt, args);
}
/**
* __ata_ehi_push_desc - push error description without adding separator
* @ehi: target EHI
* @fmt: printf format string
*
* Format string according to @fmt and append it to @ehi->desc.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
__ata_ehi_pushv_desc(ehi, fmt, args);
va_end(args);
}
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
/**
* ata_ehi_push_desc - push error description with separator
* @ehi: target EHI
* @fmt: printf format string
*
* Format string according to @fmt and append it to @ehi->desc.
* If @ehi->desc is not empty, ", " is added in-between.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
{
va_list args;
if (ehi->desc_len)
__ata_ehi_push_desc(ehi, ", ");
va_start(args, fmt);
__ata_ehi_pushv_desc(ehi, fmt, args);
va_end(args);
}
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
/**
* ata_ehi_clear_desc - clean error description
* @ehi: target EHI
*
* Clear @ehi->desc.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_ehi_clear_desc(struct ata_eh_info *ehi)
{
ehi->desc[0] = '\0';
ehi->desc_len = 0;
}
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
/**
* ata_port_desc - append port description
* @ap: target ATA port
* @fmt: printf format string
*
* Format string according to @fmt and append it to port
* description. If port description is not empty, " " is added
* in-between. This function is to be used while initializing
* ata_host. The description is printed on host registration.
*
* LOCKING:
* None.
*/
void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
{
va_list args;
WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
if (ap->link.eh_info.desc_len)
__ata_ehi_push_desc(&ap->link.eh_info, " ");
va_start(args, fmt);
__ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
va_end(args);
}
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
/**
* ata_port_pbar_desc - append PCI BAR description
* @ap: target ATA port
* @bar: target PCI BAR
* @offset: offset into PCI BAR
* @name: name of the area
*
* If @offset is negative, this function formats a string which
* contains the name, address, size and type of the BAR and
* appends it to the port description. If @offset is zero or
* positive, only name and offsetted address is appended.
*
* LOCKING:
* None.
*/
void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
const char *name)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
char *type = "";
unsigned long long start, len;
if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
type = "m";
else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
type = "i";
start = (unsigned long long)pci_resource_start(pdev, bar);
len = (unsigned long long)pci_resource_len(pdev, bar);
if (offset < 0)
ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
else
ata_port_desc(ap, "%s 0x%llx", name,
start + (unsigned long long)offset);
}
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
static int ata_lookup_timeout_table(u8 cmd)
{
int i;
for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
const u8 *cur;
for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
if (*cur == cmd)
return i;
}
return -1;
}
/**
* ata_internal_cmd_timeout - determine timeout for an internal command
* @dev: target device
* @cmd: internal command to be issued
*
* Determine timeout for internal command @cmd for @dev.
*
* LOCKING:
* EH context.
*
* RETURNS:
* Determined timeout.
*/
unsigned int ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
int ent = ata_lookup_timeout_table(cmd);
int idx;
if (ent < 0)
return ATA_EH_CMD_DFL_TIMEOUT;
idx = ehc->cmd_timeout_idx[dev->devno][ent];
return ata_eh_cmd_timeout_table[ent].timeouts[idx];
}
/**
* ata_internal_cmd_timed_out - notification for internal command timeout
* @dev: target device
* @cmd: internal command which timed out
*
* Notify EH that internal command @cmd for @dev timed out. This
* function should be called only for commands whose timeouts are
* determined using ata_internal_cmd_timeout().
*
* LOCKING:
* EH context.
*/
void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
int ent = ata_lookup_timeout_table(cmd);
int idx;
if (ent < 0)
return;
idx = ehc->cmd_timeout_idx[dev->devno][ent];
if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != UINT_MAX)
ehc->cmd_timeout_idx[dev->devno][ent]++;
}
static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
unsigned int err_mask)
{
struct ata_ering_entry *ent;
WARN_ON(!err_mask);
ering->cursor++;
ering->cursor %= ATA_ERING_SIZE;
ent = &ering->ring[ering->cursor];
ent->eflags = eflags;
ent->err_mask = err_mask;
ent->timestamp = get_jiffies_64();
}
static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
{
struct ata_ering_entry *ent = &ering->ring[ering->cursor];
if (ent->err_mask)
return ent;
return NULL;
}
int ata_ering_map(struct ata_ering *ering,
int (*map_fn)(struct ata_ering_entry *, void *),
void *arg)
{
int idx, rc = 0;
struct ata_ering_entry *ent;
idx = ering->cursor;
do {
ent = &ering->ring[idx];
if (!ent->err_mask)
break;
rc = map_fn(ent, arg);
if (rc)
break;
idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
} while (idx != ering->cursor);
return rc;
}
static int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
{
ent->eflags |= ATA_EFLAG_OLD_ER;
return 0;
}
static void ata_ering_clear(struct ata_ering *ering)
{
ata_ering_map(ering, ata_ering_clear_cb, NULL);
}
static unsigned int ata_eh_dev_action(struct ata_device *dev)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
return ehc->i.action | ehc->i.dev_action[dev->devno];
}
static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
struct ata_eh_info *ehi, unsigned int action)
{
struct ata_device *tdev;
if (!dev) {
ehi->action &= ~action;
ata_for_each_dev(tdev, link, ALL)
ehi->dev_action[tdev->devno] &= ~action;
} else {
/* doesn't make sense for port-wide EH actions */
WARN_ON(!(action & ATA_EH_PERDEV_MASK));
/* break ehi->action into ehi->dev_action */
if (ehi->action & action) {
ata_for_each_dev(tdev, link, ALL)
ehi->dev_action[tdev->devno] |=
ehi->action & action;
ehi->action &= ~action;
}
/* turn off the specified per-dev action */
ehi->dev_action[dev->devno] &= ~action;
}
}
/**
* ata_eh_acquire - acquire EH ownership
* @ap: ATA port to acquire EH ownership for
*
* Acquire EH ownership for @ap. This is the basic exclusion
* mechanism for ports sharing a host. Only one port hanging off
* the same host can claim the ownership of EH.
*
* LOCKING:
* EH context.
*/
void ata_eh_acquire(struct ata_port *ap)
{
mutex_lock(&ap->host->eh_mutex);
WARN_ON_ONCE(ap->host->eh_owner);
ap->host->eh_owner = current;
}
/**
* ata_eh_release - release EH ownership
* @ap: ATA port to release EH ownership for
*
* Release EH ownership for @ap if the caller. The caller must
* have acquired EH ownership using ata_eh_acquire() previously.
*
* LOCKING:
* EH context.
*/
void ata_eh_release(struct ata_port *ap)
{
WARN_ON_ONCE(ap->host->eh_owner != current);
ap->host->eh_owner = NULL;
mutex_unlock(&ap->host->eh_mutex);
}
static void ata_eh_dev_disable(struct ata_device *dev)
{
ata_acpi_on_disable(dev);
ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
dev->class++;
/*
* From now till the next successful probe, ering is used to
* track probe failures. Clear accumulated device error info.
*/
ata_ering_clear(&dev->ering);
ata_dev_free_resources(dev);
}
static void ata_eh_unload(struct ata_port *ap)
{
struct ata_link *link;
struct ata_device *dev;
unsigned long flags;
/*
* Unless we are restarting, transition all enabled devices to
* standby power mode.
*/
if (system_state != SYSTEM_RESTART) {
ata_for_each_link(link, ap, PMP_FIRST) {
ata_for_each_dev(dev, link, ENABLED)
ata_dev_power_set_standby(dev);
}
}
/*
* 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, ENABLED)
ata_eh_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);
unsigned long flags;
LIST_HEAD(eh_work_q);
spin_lock_irqsave(host->host_lock, flags);
list_splice_init(&host->eh_cmd_q, &eh_work_q);
spin_unlock_irqrestore(host->host_lock, flags);
ata_scsi_cmd_error_handler(host, ap, &eh_work_q);
/* If we timed raced normal completion and there is nothing to
recover nr_timedout == 0 why exactly are we doing error recovery ? */
ata_scsi_port_error_handler(host, ap);
/* finish or retry handled scmd's and clean up */
WARN_ON(!list_empty(&eh_work_q));
}
/**
* ata_scsi_cmd_error_handler - error callback for a list of commands
* @host: scsi host containing the port
* @ap: ATA port within the host
* @eh_work_q: list of commands to process
*
* process the given list of commands and return those finished to the
* ap->eh_done_q. This function is the first part of the libata error
* handler which processes a given list of failed commands.
*/
void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
struct list_head *eh_work_q)
{
int i;
unsigned long flags;
struct scsi_cmnd *scmd, *tmp;
int nr_timedout = 0;
/* make sure sff pio task is not running */
ata_sff_flush_pio_task(ap);
/* synchronize with host lock and sort out timeouts */
/*
* For EH, all qcs are finished in one of three ways -
* normal completion, error completion, and SCSI timeout.
* Both completions can race against SCSI timeout. When normal
* completion wins, the qc never reaches EH. When error
* completion wins, the qc has ATA_QCFLAG_EH 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.
*/
spin_lock_irqsave(ap->lock, flags);
/*
* This must occur under the ap->lock as we don't want
* a polled recovery to race the real interrupt handler
*
* The lost_interrupt handler checks for any completed but
* non-notified command and completes much like an IRQ handler.
*
* We then fall into the error recovery code which will treat
* this as if normal completion won the race
*/
if (ap->ops->lost_interrupt)
ap->ops->lost_interrupt(ap);
list_for_each_entry_safe(scmd, tmp, eh_work_q, eh_entry) {
struct ata_queued_cmd *qc;
/*
* If the scmd was added to EH, via ata_qc_schedule_eh() ->
* scsi_timeout() -> scsi_eh_scmd_add(), scsi_timeout() will
* have set DID_TIME_OUT (since libata does not have an abort
* handler). Thus, to clear DID_TIME_OUT, clear the host byte.
*/
set_host_byte(scmd, DID_OK);
ata_qc_for_each_raw(ap, qc, 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_EH)) {
/* which hasn't failed yet, timeout */
qc->err_mask |= AC_ERR_TIMEOUT;
qc->flags |= ATA_QCFLAG_EH;
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 ATA_QCFLAG_EH.
*/
if (nr_timedout)
__ata_port_freeze(ap);
/* initialize eh_tries */
ap->eh_tries = ATA_EH_MAX_TRIES;
spin_unlock_irqrestore(ap->lock, flags);
}
EXPORT_SYMBOL(ata_scsi_cmd_error_handler);
/**
* ata_scsi_port_error_handler - recover the port after the commands
* @host: SCSI host containing the port
* @ap: the ATA port
*
* Handle the recovery of the port @ap after all the commands
* have been recovered.
*/
void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
{
unsigned long flags;
struct ata_link *link;
/* acquire EH ownership */
ata_eh_acquire(ap);
repeat:
/* 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;
/* If we are resuming, wake up the device */
if (ap->pflags & ATA_PFLAG_RESUMING) {
dev->flags |= ATA_DFLAG_RESUMING;
ehc->i.dev_action[devno] |= ATA_EH_SET_ACTIVE;
}
}
}
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 happened 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_err(ap,
"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));
/*
* end eh (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.
*/
ap->ops->end_eh(ap);
spin_unlock_irqrestore(ap->lock, flags);
ata_eh_release(ap);
scsi_eh_flush_done_q(&ap->eh_done_q);
/* clean up */
spin_lock_irqsave(ap->lock, flags);
ap->pflags &= ~ATA_PFLAG_RESUMING;
if (ap->pflags & ATA_PFLAG_LOADING)
ap->pflags &= ~ATA_PFLAG_LOADING;
else if ((ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) &&
!(ap->flags & ATA_FLAG_SAS_HOST))
schedule_delayed_work(&ap->hotplug_task, 0);
if (ap->pflags & ATA_PFLAG_RECOVERED)
ata_port_info(ap, "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);
}
EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler);
/**
* 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)) {
ata_msleep(ap, 10);
goto retry;
}
}
EXPORT_SYMBOL_GPL(ata_port_wait_eh);
static unsigned int ata_eh_nr_in_flight(struct ata_port *ap)
{
struct ata_queued_cmd *qc;
unsigned int tag;
unsigned int nr = 0;
/* count only non-internal commands */
ata_qc_for_each(ap, qc, tag) {
if (qc)
nr++;
}
return nr;
}
void ata_eh_fastdrain_timerfn(struct timer_list *t)
{
struct ata_port *ap = from_timer(ap, t, fastdrain_timer);
unsigned long flags;
unsigned 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) {
struct ata_queued_cmd *qc;
unsigned int tag;
/* No progress during the last interval, tag all
* in-flight qcs as timed out and freeze the port.
*/
ata_qc_for_each(ap, qc, 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)
{
unsigned 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;
qc->flags |= ATA_QCFLAG_EH;
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_EH is unconditionally set after
* this function completes.
*/
blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
}
/**
* ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
* @ap: ATA port to schedule EH for
*
* LOCKING: inherited from ata_port_schedule_eh
* spin_lock_irqsave(host lock)
*/
void ata_std_sched_eh(struct ata_port *ap)
{
if (ap->pflags & ATA_PFLAG_INITIALIZING)
return;
ata_eh_set_pending(ap, 1);
scsi_schedule_eh(ap->scsi_host);
trace_ata_std_sched_eh(ap);
}
EXPORT_SYMBOL_GPL(ata_std_sched_eh);
/**
* ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
* @ap: ATA port to end EH for
*
* In the libata object model there is a 1:1 mapping of ata_port to
* shost, so host fields can be directly manipulated under ap->lock, in
* the libsas case we need to hold a lock at the ha->level to coordinate
* these events.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*/
void ata_std_end_eh(struct ata_port *ap)
{
struct Scsi_Host *host = ap->scsi_host;
host->host_eh_scheduled = 0;
}
EXPORT_SYMBOL(ata_std_end_eh);
/**
* 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)
{
/* see: ata_std_sched_eh, unless you know better */
ap->ops->sched_eh(ap);
}
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
{
struct ata_queued_cmd *qc;
int tag, nr_aborted = 0;
/* we're gonna abort all commands, no need for fast drain */
ata_eh_set_pending(ap, 0);
/* include internal tag in iteration */
ata_qc_for_each_with_internal(ap, qc, tag) {
if (qc && (!link || qc->dev->link == link)) {
qc->flags |= ATA_QCFLAG_EH;
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);
}
EXPORT_SYMBOL_GPL(ata_link_abort);
/**
* 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);
}
EXPORT_SYMBOL_GPL(ata_port_abort);
/**
* __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)
{
if (ap->ops->freeze)
ap->ops->freeze(ap);
ap->pflags |= ATA_PFLAG_FROZEN;
trace_ata_port_freeze(ap);
}
/**
* ata_port_freeze - abort & freeze port
* @ap: ATA port to freeze
*
* Abort and freeze @ap. The freeze operation must be called
* first, because some hardware requires special operations
* before the taskfile registers are accessible.
*
* LOCKING:
* spin_lock_irqsave(host lock)
*
* RETURNS:
* Number of aborted commands.
*/
int ata_port_freeze(struct ata_port *ap)
{
__ata_port_freeze(ap);
return ata_port_abort(ap);
}
EXPORT_SYMBOL_GPL(ata_port_freeze);
/**
* 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;
spin_lock_irqsave(ap->lock, flags);
__ata_port_freeze(ap);
spin_unlock_irqrestore(ap->lock, flags);
}
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
/**
* ata_eh_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;
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);
trace_ata_port_thaw(ap);
}
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->allowed is incremented 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->allowed++;
__ata_eh_qc_complete(qc);
}
/**
* ata_dev_disable - disable ATA device
* @dev: ATA device to disable
*
* Disable @dev.
*
* Locking:
* EH context.
*/
void ata_dev_disable(struct ata_device *dev)
{
if (!ata_dev_enabled(dev))
return;
ata_dev_warn(dev, "disable device\n");
ata_eh_dev_disable(dev);
}
EXPORT_SYMBOL_GPL(ata_dev_disable);
/**
* 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;
/*
* If the device is still enabled, transition it to standby power mode
* (i.e. spin down HDDs) and disable it.
*/
if (ata_dev_enabled(dev)) {
ata_dev_power_set_standby(dev);
ata_eh_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;
trace_ata_eh_about_to_do(link, dev ? dev->devno : 0, action);
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
* @link: ATA link for which EH actions are complete
* @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;
trace_ata_eh_done(link, dev ? dev->devno : 0, action);
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";
if (err_mask & AC_ERR_NCQ)
return "NCQ error";
if (err_mask & AC_ERR_NODEV_HINT)
return "Polling detection error";
return "unknown error";
}
/**
* 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.
*/
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.error >> 4;
return err_mask;
}
/**
* ata_eh_decide_disposition - Disposition a qc based on sense data
* @qc: qc to examine
*
* For a regular SCSI command, the SCSI completion callback (scsi_done())
* will call scsi_complete(), which will call scsi_decide_disposition(),
* which will call scsi_check_sense(). scsi_complete() finally calls
* scsi_finish_command(). This is fine for SCSI, since any eventual sense
* data is usually returned in the completion itself (without invoking SCSI
* EH). However, for a QC, we always need to fetch the sense data
* explicitly using SCSI EH.
*
* A command that is completed via SCSI EH will instead be completed using
* scsi_eh_flush_done_q(), which will call scsi_finish_command() directly
* (without ever calling scsi_check_sense()).
*
* For a command that went through SCSI EH, it is the responsibility of the
* SCSI EH strategy handler to call scsi_decide_disposition(), see e.g. how
* scsi_eh_get_sense() calls scsi_decide_disposition() for SCSI LLDDs that
* do not get the sense data as part of the completion.
*
* Thus, for QC commands that went via SCSI EH, we need to call
* scsi_check_sense() ourselves, similar to how scsi_eh_get_sense() calls
* scsi_decide_disposition(), which calls scsi_check_sense(), in order to
* set the correct SCSI ML byte (if any).
*
* LOCKING:
* EH context.
*
* RETURNS:
* SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE
*/
enum scsi_disposition ata_eh_decide_disposition(struct ata_queued_cmd *qc)
{
return scsi_check_sense(qc->scsicmd);
}
/**
* ata_eh_request_sense - perform REQUEST_SENSE_DATA_EXT
* @qc: qc to perform REQUEST_SENSE_SENSE_DATA_EXT to
*
* Perform REQUEST_SENSE_DATA_EXT after the device reported CHECK
* SENSE. This function is an EH helper.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* true if sense data could be fetched, false otherwise.
*/
static bool ata_eh_request_sense(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
struct ata_device *dev = qc->dev;
struct ata_taskfile tf;
unsigned int err_mask;
if (ata_port_is_frozen(qc->ap)) {
ata_dev_warn(dev, "sense data available but port frozen\n");
return false;
}
if (!ata_id_sense_reporting_enabled(dev->id)) {
ata_dev_warn(qc->dev, "sense data reporting disabled\n");
return false;
}
ata_tf_init(dev, &tf);
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf.flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
tf.command = ATA_CMD_REQ_SENSE_DATA;
tf.protocol = ATA_PROT_NODATA;
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
/* Ignore err_mask; ATA_ERR might be set */
if (tf.status & ATA_SENSE) {
if (ata_scsi_sense_is_valid(tf.lbah, tf.lbam, tf.lbal)) {
/* Set sense without also setting scsicmd->result */
scsi_build_sense_buffer(dev->flags & ATA_DFLAG_D_SENSE,
cmd->sense_buffer, tf.lbah,
tf.lbam, tf.lbal);
qc->flags |= ATA_QCFLAG_SENSE_VALID;
return true;
}
} else {
ata_dev_warn(dev, "request sense failed stat %02x emask %x\n",
tf.status, err_mask);
}
return false;
}
/**
* 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
*/
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;
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.
*/
if (link->lpm_policy > ATA_LPM_MAX_POWER)
hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
else 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_tf - analyze taskfile of a failed qc
* @qc: qc to analyze
*
* Analyze taskfile of @qc and further determine cause of
* failure. This function also requests ATAPI sense data if
* available.
*
* 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 = &qc->result_tf;
unsigned int tmp, action = 0;
u8 stat = tf->status, err = tf->error;
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;
/*
* Sense data reporting does not work if the
* device fault bit is set.
*/
if (stat & ATA_DF)
stat &= ~ATA_SENSE;
} else {
return 0;
}
switch (qc->dev->class) {
case ATA_DEV_ATA:
case ATA_DEV_ZAC:
/*
* Fetch the sense data explicitly if:
* -It was a non-NCQ command that failed, or
* -It was a NCQ command that failed, but the sense data
* was not included in the NCQ command error log
* (i.e. NCQ autosense is not supported by the device).
*/
if (!(qc->flags & ATA_QCFLAG_SENSE_VALID) &&
(stat & ATA_SENSE) && ata_eh_request_sense(qc))
set_status_byte(qc->scsicmd, SAM_STAT_CHECK_CONDITION);
if (err & ATA_ICRC)
qc->err_mask |= AC_ERR_ATA_BUS;
if (err & (ATA_UNC | ATA_AMNF))
qc->err_mask |= AC_ERR_MEDIA;
if (err & ATA_IDNF)
qc->err_mask |= AC_ERR_INVALID;
break;
case ATA_DEV_ATAPI:
if (!ata_port_is_frozen(qc->ap)) {
tmp = atapi_eh_request_sense(qc->dev,
qc->scsicmd->sense_buffer,
qc->result_tf.error >> 4);
if (!tmp)
qc->flags |= ATA_QCFLAG_SENSE_VALID;
else
qc->err_mask |= tmp;
}
}
if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
enum scsi_disposition ret = ata_eh_decide_disposition(qc);
/*
* SUCCESS here means that the sense code could be
* evaluated and should be passed to the upper layers
* for correct evaluation.
* FAILED means the sense code could not be interpreted
* and the device would need to be reset.
* NEEDS_RETRY and ADD_TO_MLQUEUE means that the
* command would need to be retried.
*/
if (ret == NEEDS_RETRY || ret == ADD_TO_MLQUEUE) {
qc->flags |= ATA_QCFLAG_RETRY;
qc->err_mask |= AC_ERR_OTHER;
} else if (ret != SUCCESS) {
qc->err_mask |= AC_ERR_HSM;
}
}
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->eflags & ATA_EFLAG_OLD_ER) || (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 following 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
* occurred 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) && ata_ncq_enabled(dev)) {
dev->flags |= ATA_DFLAG_NCQ_OFF;
ata_dev_warn(dev, "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) == 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_worth_retry - analyze error and decide whether to retry
* @qc: qc to possibly retry
*
* Look at the cause of the error and decide if a retry
* might be useful or not. We don't want to retry media errors
* because the drive itself has probably already taken 10-30 seconds
* doing its own internal retries before reporting the failure.
*/
static inline int ata_eh_worth_retry(struct ata_queued_cmd *qc)
{
if (qc->err_mask & AC_ERR_MEDIA)
return 0; /* don't retry media errors */
if (qc->flags & ATA_QCFLAG_IO)
return 1; /* otherwise retry anything from fs stack */
if (qc->err_mask & AC_ERR_INVALID)
return 0; /* don't retry these */
return qc->err_mask != AC_ERR_DEV; /* retry if not dev error */
}
/**
* ata_eh_quiet - check if we need to be quiet about a command error
* @qc: qc to check
*
* Look at the qc flags anbd its scsi command request flags to determine
* if we need to be quiet about the command failure.
*/
static inline bool ata_eh_quiet(struct ata_queued_cmd *qc)
{
if (qc->scsicmd && scsi_cmd_to_rq(qc->scsicmd)->rq_flags & RQF_QUIET)
qc->flags |= ATA_QCFLAG_QUIET;
return qc->flags & ATA_QCFLAG_QUIET;
}
static int ata_eh_get_non_ncq_success_sense(struct ata_link *link)
{
struct ata_port *ap = link->ap;
struct ata_queued_cmd *qc;
qc = __ata_qc_from_tag(ap, link->active_tag);
if (!qc)
return -EIO;
if (!(qc->flags & ATA_QCFLAG_EH) ||
!(qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD) ||
qc->err_mask)
return -EIO;
if (!ata_eh_request_sense(qc))
return -EIO;
/*
* No point in checking the return value, since the command has already
* completed successfully.
*/
ata_eh_decide_disposition(qc);
return 0;
}
static void ata_eh_get_success_sense(struct ata_link *link)
{
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev = link->device;
struct ata_port *ap = link->ap;
struct ata_queued_cmd *qc;
int tag, ret = 0;
if (!(ehc->i.dev_action[dev->devno] & ATA_EH_GET_SUCCESS_SENSE))
return;
/* if frozen, we can't do much */
if (ata_port_is_frozen(ap)) {
ata_dev_warn(dev,
"successful sense data available but port frozen\n");
goto out;
}
/*
* If the link has sactive set, then we have outstanding NCQ commands
* and have to read the Successful NCQ Commands log to get the sense
* data. Otherwise, we are dealing with a non-NCQ command and use
* request sense ext command to retrieve the sense data.
*/
if (link->sactive)
ret = ata_eh_get_ncq_success_sense(link);
else
ret = ata_eh_get_non_ncq_success_sense(link);
if (ret)
goto out;
ata_eh_done(link, dev, ATA_EH_GET_SUCCESS_SENSE);
return;
out:
/*
* If we failed to get sense data for a successful command that ought to
* have sense data, we cannot simply return BLK_STS_OK to user space.
* This is because we can't know if the sense data that we couldn't get
* was actually "DATA CURRENTLY UNAVAILABLE". Reporting such a command
* as success to user space would result in a silent data corruption.
* Thus, add a bogus ABORTED_COMMAND sense data to such commands, such
* that SCSI will report these commands as BLK_STS_IOERR to user space.
*/
ata_qc_for_each_raw(ap, qc, tag) {
if (!(qc->flags & ATA_QCFLAG_EH) ||
!(qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD) ||
qc->err_mask ||
ata_dev_phys_link(qc->dev) != link)
continue;
/* We managed to get sense for this success command, skip. */
if (qc->flags & ATA_QCFLAG_SENSE_VALID)
continue;
/* This success command did not have any sense data, skip. */
if (!(qc->result_tf.status & ATA_SENSE))
continue;
/* This success command had sense data, but we failed to get. */
ata_scsi_set_sense(dev, qc->scsicmd, ABORTED_COMMAND, 0, 0);
qc->flags |= ATA_QCFLAG_SENSE_VALID;
}
ata_eh_done(link, dev, ATA_EH_GET_SUCCESS_SENSE);
}
/**
* 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_queued_cmd *qc;
struct ata_device *dev;
unsigned int all_err_mask = 0, eflags = 0;
int tag, nr_failed = 0, nr_quiet = 0;
u32 serror;
int rc;
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);
/*
* Check if this was a successful command that simply needs sense data.
* Since the sense data is not part of the completion, we need to fetch
* it using an additional command. Since this can't be done from irq
* context, the sense data for successful commands are fetched by EH.
*/
ata_eh_get_success_sense(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;
ata_qc_for_each_raw(ap, qc, tag) {
if (!(qc->flags & ATA_QCFLAG_EH) ||
qc->flags & ATA_QCFLAG_RETRY ||
qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD ||
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);
/* 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. Upper
* layers will determine whether the command is worth retrying
* based on the sense data and device class/type. Otherwise,
* determine directly if the command is worth retrying using its
* error mask and flags.
*/
if (qc->flags & ATA_QCFLAG_SENSE_VALID)
qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
else if (ata_eh_worth_retry(qc))
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;
trace_ata_eh_link_autopsy_qc(qc);
/* Count quiet errors */
if (ata_eh_quiet(qc))
nr_quiet++;
nr_failed++;
}
/* If all failed commands requested silence, then be quiet */
if (nr_quiet == nr_failed)
ehc->i.flags |= ATA_EHI_QUIET;
/* enforce default EH actions */
if (ata_port_is_frozen(ap) ||
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);
trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
}
}
/**
* 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_get_cmd_name - get name for ATA command
* @command: ATA command code to get name for
*
* Return a textual name of the given command or "unknown"
*
* LOCKING:
* None
*/
const char *ata_get_cmd_name(u8 command)
{
#ifdef CONFIG_ATA_VERBOSE_ERROR
static const struct
{
u8 command;
const char *text;
} cmd_descr[] = {
{ ATA_CMD_DEV_RESET, "DEVICE RESET" },
{ ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
{ ATA_CMD_STANDBY, "STANDBY" },
{ ATA_CMD_IDLE, "IDLE" },
{ ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
{ ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
{ ATA_CMD_DOWNLOAD_MICRO_DMA, "DOWNLOAD MICROCODE DMA" },
{ ATA_CMD_NOP, "NOP" },
{ ATA_CMD_FLUSH, "FLUSH CACHE" },
{ ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
{ ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
{ ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
{ ATA_CMD_SERVICE, "SERVICE" },
{ ATA_CMD_READ, "READ DMA" },
{ ATA_CMD_READ_EXT, "READ DMA EXT" },
{ ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
{ ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
{ ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
{ ATA_CMD_WRITE, "WRITE DMA" },
{ ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
{ ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
{ ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
{ ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
{ ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
{ ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
{ ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
{ ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
{ ATA_CMD_NCQ_NON_DATA, "NCQ NON-DATA" },
{ ATA_CMD_FPDMA_SEND, "SEND FPDMA QUEUED" },
{ ATA_CMD_FPDMA_RECV, "RECEIVE FPDMA QUEUED" },
{ ATA_CMD_PIO_READ, "READ SECTOR(S)" },
{ ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
{ ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
{ ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
{ ATA_CMD_READ_MULTI, "READ MULTIPLE" },
{ ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
{ ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
{ ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
{ ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
{ ATA_CMD_SET_FEATURES, "SET FEATURES" },
{ ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
{ ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
{ ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
{ ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
{ ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
{ ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
{ ATA_CMD_SLEEP, "SLEEP" },
{ ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
{ ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
{ ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
{ ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
{ ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
{ ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
{ ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
{ ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
{ ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
{ ATA_CMD_TRUSTED_NONDATA, "TRUSTED NON-DATA" },
{ ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
{ ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
{ ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
{ ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
{ ATA_CMD_PMP_READ, "READ BUFFER" },
{ ATA_CMD_PMP_READ_DMA, "READ BUFFER DMA" },
{ ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
{ ATA_CMD_PMP_WRITE_DMA, "WRITE BUFFER DMA" },
{ ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
{ ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
{ ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
{ ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
{ ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
{ ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
{ ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
{ ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
{ ATA_CMD_SMART, "SMART" },
{ ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
{ ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
{ ATA_CMD_DSM, "DATA SET MANAGEMENT" },
{ ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
{ ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
{ ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
{ ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
{ ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
{ ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
{ ATA_CMD_REQ_SENSE_DATA, "REQUEST SENSE DATA EXT" },
{ ATA_CMD_SANITIZE_DEVICE, "SANITIZE DEVICE" },
{ ATA_CMD_ZAC_MGMT_IN, "ZAC MANAGEMENT IN" },
{ ATA_CMD_ZAC_MGMT_OUT, "ZAC MANAGEMENT OUT" },
{ ATA_CMD_READ_LONG, "READ LONG (with retries)" },
{ ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
{ ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
{ ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
{ ATA_CMD_RESTORE, "RECALIBRATE" },
{ 0, NULL } /* terminate list */
};
unsigned int i;
for (i = 0; cmd_descr[i].text; i++)
if (cmd_descr[i].command == command)
return cmd_descr[i].text;
#endif
return "unknown";
}
EXPORT_SYMBOL_GPL(ata_get_cmd_name);
/**
* 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;
struct ata_queued_cmd *qc;
const char *frozen, *desc;
char tries_buf[16] = "";
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;
ata_qc_for_each_raw(ap, qc, tag) {
if (!(qc->flags & ATA_QCFLAG_EH) ||
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 (ata_port_is_frozen(ap))
frozen = " frozen";
if (ap->eh_tries < ATA_EH_MAX_TRIES)
snprintf(tries_buf, sizeof(tries_buf), " t%d",
ap->eh_tries);
if (ehc->i.dev) {
ata_dev_err(ehc->i.dev, "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_err(ehc->i.dev, "%s\n", desc);
} else {
ata_link_err(link, "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_err(link, "%s\n", desc);
}
#ifdef CONFIG_ATA_VERBOSE_ERROR
if (ehc->i.serror)
ata_link_err(link,
"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 " : "");
#endif
ata_qc_for_each_raw(ap, qc, tag) {
struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
char data_buf[20] = "";
char cdb_buf[70] = "";
if (!(qc->flags & ATA_QCFLAG_EH) ||
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",
};
const char *prot_str = NULL;
switch (qc->tf.protocol) {
case ATA_PROT_UNKNOWN:
prot_str = "unknown";
break;
case ATA_PROT_NODATA:
prot_str = "nodata";
break;
case ATA_PROT_PIO:
prot_str = "pio";
break;
case ATA_PROT_DMA:
prot_str = "dma";
break;
case ATA_PROT_NCQ:
prot_str = "ncq dma";
break;
case ATA_PROT_NCQ_NODATA:
prot_str = "ncq nodata";
break;
case ATAPI_PROT_NODATA:
prot_str = "nodata";
break;
case ATAPI_PROT_PIO:
prot_str = "pio";
break;
case ATAPI_PROT_DMA:
prot_str = "dma";
break;
}
snprintf(data_buf, sizeof(data_buf), " %s %u %s",
prot_str, qc->nbytes, dma_str[qc->dma_dir]);
}
if (ata_is_atapi(qc->tf.protocol)) {
const u8 *cdb = qc->cdb;
size_t cdb_len = qc->dev->cdb_len;
if (qc->scsicmd) {
cdb = qc->scsicmd->cmnd;
cdb_len = qc->scsicmd->cmd_len;
}
__scsi_format_command(cdb_buf, sizeof(cdb_buf),
cdb, cdb_len);
} else
ata_dev_err(qc->dev, "failed command: %s\n",
ata_get_cmd_name(cmd->command));
ata_dev_err(qc->dev,
"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->status, res->error, 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>" : "");
#ifdef CONFIG_ATA_VERBOSE_ERROR
if (res->status & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
ATA_SENSE | ATA_ERR)) {
if (res->status & ATA_BUSY)
ata_dev_err(qc->dev, "status: { Busy }\n");
else
ata_dev_err(qc->dev, "status: { %s%s%s%s%s}\n",
res->status & ATA_DRDY ? "DRDY " : "",
res->status & ATA_DF ? "DF " : "",
res->status & ATA_DRQ ? "DRQ " : "",
res->status & ATA_SENSE ? "SENSE " : "",
res->status & ATA_ERR ? "ERR " : "");
}
if (cmd->command != ATA_CMD_PACKET &&
(res->error & (ATA_ICRC | ATA_UNC | ATA_AMNF | ATA_IDNF |
ATA_ABORTED)))
ata_dev_err(qc->dev, "error: { %s%s%s%s%s}\n",
res->error & ATA_ICRC ? "ICRC " : "",
res->error & ATA_UNC ? "UNC " : "",
res->error & ATA_AMNF ? "AMNF " : "",
res->error & ATA_IDNF ? "IDNF " : "",
res->error & ATA_ABORTED ? "ABRT " : "");
#endif
}
}
/**
* 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)
{
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 ? &slave->eh_context : NULL;
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] != UINT_MAX)
max_tries++;
if (link->flags & ATA_LFLAG_RST_ONCE)
max_tries = 1;
if (link->flags & ATA_LFLAG_NO_HRST)
hardreset = NULL;
if (link->flags & ATA_LFLAG_NO_SRST)
softreset = NULL;
/* make sure each reset attempt 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;
dev->dma_mode = 0xff;
/* 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_dbg(link, "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_err(link,
"prereset failed (errno=%d)\n",
rc);
goto out;
}
/* prereset() might have cleared ATA_EH_RESET. If so,
* bang classes, thaw and return.
*/
if (reset && !(ehc->i.action & ATA_EH_RESET)) {
ata_for_each_dev(dev, link, ALL)
classes[dev->devno] = ATA_DEV_NONE;
if (ata_port_is_frozen(ap) && ata_is_host_link(link))
ata_eh_thaw_port(ap);
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_info(link, "%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;
trace_ata_link_hardreset_begin(link, classes, deadline);
} else {
ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
trace_ata_link_softreset_begin(link, classes, deadline);
}
rc = ata_do_reset(link, reset, classes, deadline, true);
if (reset == hardreset)
trace_ata_link_hardreset_end(link, classes, rc);
else
trace_ata_link_softreset_end(link, classes, rc);
if (rc && rc != -EAGAIN) {
failed_link = link;
goto fail;
}
/* hardreset slave link if existent */
if (slave && reset == hardreset) {
int tmp;
if (verbose)
ata_link_info(slave, "hard resetting link\n");
ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
trace_ata_slave_hardreset_begin(slave, classes,
deadline);
tmp = ata_do_reset(slave, reset, classes, deadline,
false);
trace_ata_slave_hardreset_end(slave, classes, tmp);
switch (tmp) {
case -EAGAIN:
rc = -EAGAIN;
break;
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)) {
reset = softreset;
if (!reset) {
ata_link_err(link,
"follow-up softreset required but no softreset available\n");
failed_link = link;
rc = -EINVAL;
goto fail;
}
ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
trace_ata_link_softreset_begin(link, classes, deadline);
rc = ata_do_reset(link, reset, classes, deadline, true);
trace_ata_link_softreset_end(link, classes, rc);
if (rc) {
failed_link = link;
goto fail;
}
}
} else {
if (verbose)
ata_link_info(link,
"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)))
continue;
/* 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;
}
/* 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);
trace_ata_link_postreset(link, classes, rc);
if (slave) {
postreset(slave, classes);
trace_ata_slave_postreset(slave, classes, rc);
}
}
/* 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 on/offlineness and classification result, those
* conditions can be reliably detected and retried.
*/
nr_unknown = 0;
ata_for_each_dev(dev, link, ALL) {
if (ata_phys_link_online(ata_dev_phys_link(dev))) {
if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
ata_dev_dbg(dev, "link online but device misclassified\n");
classes[dev->devno] = ATA_DEV_NONE;
nr_unknown++;
}
} else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
if (ata_class_enabled(classes[dev->devno]))
ata_dev_dbg(dev,
"link offline, clearing class %d to NONE\n",
classes[dev->devno]);
classes[dev->devno] = ATA_DEV_NONE;
} else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
ata_dev_dbg(dev,
"link status unknown, clearing UNKNOWN to NONE\n");
classes[dev->devno] = ATA_DEV_NONE;
}
}
if (classify && nr_unknown) {
if (try < max_tries) {
ata_link_warn(link,
"link online but %d devices misclassified, retrying\n",
nr_unknown);
failed_link = link;
rc = -EAGAIN;
goto fail;
}
ata_link_warn(link,
"link online but %d devices misclassified, "
"device detection might fail\n", nr_unknown);
}
/* 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;
link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
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 (try >= max_tries) {
/*
* Thaw host port even if reset failed, so that the port
* can be retried on the next phy event. This risks
* repeated EH runs but seems to be a better tradeoff than
* shutting down a port after a botched hotplug attempt.
*/
if (ata_is_host_link(link))
ata_eh_thaw_port(ap);
ata_link_warn(link, "%s failed\n",
reset == hardreset ? "hardreset" : "softreset");
goto out;
}
now = jiffies;
if (time_before(now, deadline)) {
unsigned long delta = deadline - now;
ata_link_warn(failed_link,
"reset failed (errno=%d), retrying in %u secs\n",
rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
ata_eh_release(ap);
while (delta)
delta = schedule_timeout_uninterruptible(delta);
ata_eh_acquire(ap);
}
/*
* While disks spinup behind PMP, some controllers fail sending SRST.
* They need to be reset - as well as the PMP - before retrying.
*/
if (rc == -ERESTART) {
if (ata_is_host_link(link))
ata_eh_thaw_port(ap);
goto out;
}
if (try == max_tries - 1) {
sata_down_spd_limit(link, 0);
if (slave)
sata_down_spd_limit(slave, 0);
} else if (rc == -EPIPE)
sata_down_spd_limit(failed_link, 0);
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 reinit_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);
reinit_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_err(dev, "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;
/* 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);
/*
* The link may be in a deep sleep, wake it up.
*
* If the link is in deep sleep, ata_phys_link_offline()
* will return true, causing the revalidation to fail,
* which leads to a (potentially) needless hard reset.
*
* ata_eh_recover() will later restore the link policy
* to ap->target_lpm_policy after revalidation is done.
*/
if (link->lpm_policy > ATA_LPM_MAX_POWER) {
rc = ata_eh_set_lpm(link, ATA_LPM_MAX_POWER,
r_failed_dev);
if (rc)
goto err;
}
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 */
schedule_delayed_work(&ap->scsi_rescan_task, 0);
} else if (dev->class == ATA_DEV_UNKNOWN &&
ehc->tries[dev->devno] &&
ata_class_enabled(ehc->classes[dev->devno])) {
/* Temporarily set dev->class, it will be
* permanently set once all configurations are
* complete. This is necessary because new
* device configuration is done in two
* separate loops.
*/
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);
/* read_id might have changed class, store and reset */
ehc->classes[dev->devno] = dev->class;
dev->class = ATA_DEV_UNKNOWN;
switch (rc) {
case 0:
/* clear error info accumulated during probe */
ata_ering_clear(&dev->ering);
new_mask |= 1 << dev->devno;
break;
case -ENOENT:
/* IDENTIFY was issued to non-existent
* device. No need to reset. Just
* thaw and ignore the device.
*/
ata_eh_thaw_port(ap);
break;
default:
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)))
continue;
dev->class = ehc->classes[dev->devno];
if (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) {
dev->class = ATA_DEV_UNKNOWN;
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:
dev->flags &= ~ATA_DFLAG_RESUMING;
*r_failed_dev = dev;
return rc;
}
/**
* ata_set_mode - Program timings and issue SET FEATURES - XFER
* @link: link on which timings will be programmed
* @r_failed_dev: out parameter 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 = dev->sector_buf;
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_warn(dev,
"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_warn(dev, "failed to clear "
"UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
return -EIO;
}
}
ata_dev_warn(dev, "UNIT ATTENTION persists after %d tries\n",
ATA_EH_UA_TRIES);
return 0;
}
/**
* ata_eh_maybe_retry_flush - Retry FLUSH if necessary
* @dev: ATA device which may need FLUSH retry
*
* If @dev failed FLUSH, it needs to be reported upper layer
* immediately as it means that @dev failed to remap and already
* lost at least a sector and further FLUSH retrials won't make
* any difference to the lost sector. However, if FLUSH failed
* for other reasons, for example transmission error, FLUSH needs
* to be retried.
*
* This function determines whether FLUSH failure retry is
* necessary and performs it if so.
*
* RETURNS:
* 0 if EH can continue, -errno if EH needs to be repeated.
*/
static int ata_eh_maybe_retry_flush(struct ata_device *dev)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
struct ata_queued_cmd *qc;
struct ata_taskfile tf;
unsigned int err_mask;
int rc = 0;
/* did flush fail for this device? */
if (!ata_tag_valid(link->active_tag))
return 0;
qc = __ata_qc_from_tag(ap, link->active_tag);
if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
qc->tf.command != ATA_CMD_FLUSH))
return 0;
/* if the device failed it, it should be reported to upper layers */
if (qc->err_mask & AC_ERR_DEV)
return 0;
/* flush failed for some other reason, give it another shot */
ata_tf_init(dev, &tf);
tf.command = qc->tf.command;
tf.flags |= ATA_TFLAG_DEVICE;
tf.protocol = ATA_PROT_NODATA;
ata_dev_warn(dev, "retrying FLUSH 0x%x Emask 0x%x\n",
tf.command, qc->err_mask);
err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
if (!err_mask) {
/*
* FLUSH is complete but there's no way to
* successfully complete a failed command from EH.
* Making sure retry is allowed at least once and
* retrying it should do the trick - whatever was in
* the cache is already on the platter and this won't
* cause infinite loop.
*/
qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
} else {
ata_dev_warn(dev, "FLUSH failed Emask 0x%x\n",
err_mask);
rc = -EIO;
/* if device failed it, report it to upper layers */
if (err_mask & AC_ERR_DEV) {
qc->err_mask |= AC_ERR_DEV;
qc->result_tf = tf;
if (!ata_port_is_frozen(ap))
rc = 0;
}
}
return rc;
}
/**
* ata_eh_set_lpm - configure SATA interface power management
* @link: link to configure power management
* @policy: the link power management policy
* @r_failed_dev: out parameter for failed device
*
* Enable SATA Interface power management. This will enable
* Device Interface Power Management (DIPM) for min_power and
* medium_power_with_dipm policies, and then call driver specific
* callbacks for enabling Host Initiated Power management.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
struct ata_device **r_failed_dev)
{
struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
enum ata_lpm_policy old_policy = link->lpm_policy;
bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM;
unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
unsigned int err_mask;
int rc;
/* if the link or host doesn't do LPM, noop */
if (!IS_ENABLED(CONFIG_SATA_HOST) ||
(link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
return 0;
/*
* DIPM is enabled only for MIN_POWER as some devices
* misbehave when the host NACKs transition to SLUMBER. Order
* device and link configurations such that the host always
* allows DIPM requests.
*/
ata_for_each_dev(dev, link, ENABLED) {
bool hipm = ata_id_has_hipm(dev->id);
bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
/* find the first enabled and LPM enabled devices */
if (!link_dev)
link_dev = dev;
if (!lpm_dev && (hipm || dipm))
lpm_dev = dev;
hints &= ~ATA_LPM_EMPTY;
if (!hipm)
hints &= ~ATA_LPM_HIPM;
/* disable DIPM before changing link config */
if (policy < ATA_LPM_MED_POWER_WITH_DIPM && dipm) {
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_DISABLE, SATA_DIPM);
if (err_mask && err_mask != AC_ERR_DEV) {
ata_dev_warn(dev,
"failed to disable DIPM, Emask 0x%x\n",
err_mask);
rc = -EIO;
goto fail;
}
}
}
if (ap) {
rc = ap->ops->set_lpm(link, policy, hints);
if (!rc && ap->slave_link)
rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
} else
rc = sata_pmp_set_lpm(link, policy, hints);
/*
* Attribute link config failure to the first (LPM) enabled
* device on the link.
*/
if (rc) {
if (rc == -EOPNOTSUPP) {
link->flags |= ATA_LFLAG_NO_LPM;
return 0;
}
dev = lpm_dev ? lpm_dev : link_dev;
goto fail;
}
/*
* Low level driver acked the transition. Issue DIPM command
* with the new policy set.
*/
link->lpm_policy = policy;
if (ap && ap->slave_link)
ap->slave_link->lpm_policy = policy;
/* host config updated, enable DIPM if transitioning to MIN_POWER */
ata_for_each_dev(dev, link, ENABLED) {
if (policy >= ATA_LPM_MED_POWER_WITH_DIPM && !no_dipm &&
ata_id_has_dipm(dev->id)) {
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE, SATA_DIPM);
if (err_mask && err_mask != AC_ERR_DEV) {
ata_dev_warn(dev,
"failed to enable DIPM, Emask 0x%x\n",
err_mask);
rc = -EIO;
goto fail;
}
}
}
link->last_lpm_change = jiffies;
link->flags |= ATA_LFLAG_CHANGED;
return 0;
fail:
/* restore the old policy */
link->lpm_policy = old_policy;
if (ap && ap->slave_link)
ap->slave_link->lpm_policy = old_policy;
/* if no device or only one more chance is left, disable LPM */
if (!dev || ehc->tries[dev->devno] <= 2) {
ata_link_warn(link, "disabling LPM on the link\n");
link->flags |= ATA_LFLAG_NO_LPM;
}
if (r_failed_dev)
*r_failed_dev = dev;
return rc;
}
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;
/* skip if explicitly requested */
if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
return 1;
/* thaw frozen port and recover failed devices */
if (ata_port_is_frozen(ap) || 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_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
{
u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
u64 now = get_jiffies_64();
int *trials = void_arg;
if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
(ent->timestamp < now - min(now, interval)))
return -1;
(*trials)++;
return 0;
}
static int ata_eh_schedule_probe(struct ata_device *dev)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
struct ata_link *link = ata_dev_phys_link(dev);
int trials = 0;
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);
/* the link maybe in a deep sleep, wake it up */
if (link->lpm_policy > ATA_LPM_MAX_POWER) {
if (ata_is_host_link(link))
link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
ATA_LPM_EMPTY);
else
sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
ATA_LPM_EMPTY);
}
/* Record and count probe trials on the ering. The specific
* error mask used is irrelevant. Because a successful device
* detection clears the ering, this count accumulates only if
* there are consecutive failed probes.
*
* If the count is equal to or higher than ATA_EH_PROBE_TRIALS
* in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
* forced to 1.5Gbps.
*
* This is to work around cases where failed link speed
* negotiation results in device misdetection leading to
* infinite DEVXCHG or PHRDY CHG events.
*/
ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
if (trials > ATA_EH_PROBE_TRIALS)
sata_down_spd_limit(link, 1);
return 1;
}
static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
{
struct ata_eh_context *ehc = &dev->link->eh_context;
/* -EAGAIN from EH routine indicates retry without prejudice.
* The requester is responsible for ensuring forward progress.
*/
if (err != -EAGAIN)
ehc->tries[dev->devno]--;
switch (err) {
case -ENODEV:
/* device missing or wrong IDENTIFY data, schedule probing */
ehc->i.probe_mask |= (1 << dev->devno);
fallthrough;
case -EINVAL:
/* give it just one more chance */
ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
fallthrough;
case -EIO:
if (ehc->tries[dev->devno] == 1) {
/* This is the last chance, better to slow
* down than lose it.
*/
sata_down_spd_limit(ata_dev_phys_link(dev), 0);
if (dev->pio_mode > XFER_PIO_0)
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 rc, nr_fails;
unsigned long flags, deadline;
/* 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;
/* 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_err(link, "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 &&
dev->class != ATA_DEV_ZAC)
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;
ata_eh_release(ap);
deadline = wait_for_completion_timeout(&ap->park_req_pending,
deadline - now);
ata_eh_acquire(ap);
} 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 */
nr_fails = 0;
ata_for_each_link(link, ap, PMP_FIRST) {
struct ata_eh_context *ehc = &link->eh_context;
if (sata_pmp_attached(ap) && ata_is_host_link(link))
goto config_lpm;
/* revalidate existing devices and attach new ones */
rc = ata_eh_revalidate_and_attach(link, &dev);
if (rc)
goto rest_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 rest_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 rest_fail;
if (zpodd_dev_enabled(dev))
zpodd_post_poweron(dev);
}
}
/*
* Make sure to transition devices to the active power mode
* if needed (e.g. if we were scheduled on system resume).
*/
ata_for_each_dev(dev, link, ENABLED) {
if (ehc->i.dev_action[dev->devno] & ATA_EH_SET_ACTIVE) {
ata_dev_power_set_active(dev);
ata_eh_done(link, dev, ATA_EH_SET_ACTIVE);
}
}
/* retry flush if necessary */
ata_for_each_dev(dev, link, ALL) {
if (dev->class != ATA_DEV_ATA &&
dev->class != ATA_DEV_ZAC)
continue;
rc = ata_eh_maybe_retry_flush(dev);
if (rc)
goto rest_fail;
}
config_lpm:
/* configure link power saving */
if (link->lpm_policy != ap->target_lpm_policy) {
rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
if (rc)
goto rest_fail;
}
/* this link is okay now */
ehc->i.flags = 0;
continue;
rest_fail:
nr_fails++;
if (dev)
ata_eh_handle_dev_fail(dev, rc);
if (ata_port_is_frozen(ap)) {
/* PMP reset requires working host port.
* Can't retry if it's frozen.
*/
if (sata_pmp_attached(ap))
goto out;
break;
}
}
if (nr_fails)
goto retry;
out:
if (rc && r_failed_link)
*r_failed_link = link;
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)
{
struct ata_queued_cmd *qc;
int tag;
/* retry or finish qcs */
ata_qc_for_each_raw(ap, qc, tag) {
if (!(qc->flags & ATA_QCFLAG_EH))
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) {
/*
* Since qc->err_mask is set, ata_eh_qc_retry()
* will not increment scmd->allowed, so upper
* layer will only retry the command if it has
* not already been retried too many times.
*/
ata_eh_qc_retry(qc);
} else {
ata_eh_qc_complete(qc);
}
} else {
if (qc->flags & ATA_QCFLAG_SENSE_VALID ||
qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD) {
ata_eh_qc_complete(qc);
} else {
/* feed zero TF to sense generation */
memset(&qc->result_tf, 0, sizeof(qc->result_tf));
/*
* Since qc->err_mask is not set,
* ata_eh_qc_retry() will increment
* scmd->allowed, so upper layer is guaranteed
* to retry the command.
*/
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 (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
hardreset = NULL;
ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
}
EXPORT_SYMBOL_GPL(ata_std_error_handler);
#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;
struct ata_device *dev;
struct ata_link *link;
/* are we suspending? */
spin_lock_irqsave(ap->lock, flags);
if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
ap->pm_mesg.event & PM_EVENT_RESUME) {
spin_unlock_irqrestore(ap->lock, flags);
return;
}
spin_unlock_irqrestore(ap->lock, flags);
WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
/* Set all devices attached to the port in standby mode */
ata_for_each_link(link, ap, HOST_FIRST) {
ata_for_each_dev(dev, link, ENABLED)
ata_dev_power_set_standby(dev);
}
/*
* If we have a ZPODD attached, check its zero
* power ready status before the port is frozen.
* Only needed for runtime suspend.
*/
if (PMSG_IS_AUTO(ap->pm_mesg)) {
ata_for_each_dev(dev, &ap->link, ENABLED) {
if (zpodd_dev_enabled(dev))
zpodd_on_suspend(dev);
}
}
/* 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, ap->pm_mesg);
/* update the flags */
spin_lock_irqsave(ap->lock, flags);
ap->pflags &= ~ATA_PFLAG_PM_PENDING;
if (rc == 0)
ap->pflags |= ATA_PFLAG_SUSPENDED;
else if (ata_port_is_frozen(ap))
ata_port_schedule_eh(ap);
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)
{
struct ata_link *link;
struct ata_device *dev;
unsigned long flags;
/* are we resuming? */
spin_lock_irqsave(ap->lock, flags);
if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
!(ap->pm_mesg.event & PM_EVENT_RESUME)) {
spin_unlock_irqrestore(ap->lock, flags);
return;
}
spin_unlock_irqrestore(ap->lock, flags);
WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
/*
* Error timestamps are in jiffies which doesn't run while
* suspended and PHY events during resume isn't too uncommon.
* When the two are combined, it can lead to unnecessary speed
* downs if the machine is suspended and resumed repeatedly.
* Clear error history.
*/
ata_for_each_link(link, ap, HOST_FIRST)
ata_for_each_dev(dev, link, ALL)
ata_ering_clear(&dev->ering);
ata_acpi_set_state(ap, ap->pm_mesg);
if (ap->ops->port_resume)
ap->ops->port_resume(ap);
/* tell ACPI that we're resuming */
ata_acpi_on_resume(ap);
/* update the flags */
spin_lock_irqsave(ap->lock, flags);
ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
ap->pflags |= ATA_PFLAG_RESUMING;
spin_unlock_irqrestore(ap->lock, flags);
}
#endif /* CONFIG_PM */
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