| /* |
| * libata-eh.c - libata error handling |
| * |
| * Maintained by: Tejun Heo <tj@kernel.org> |
| * Please ALWAYS copy linux-ide@vger.kernel.org |
| * on emails. |
| * |
| * Copyright 2006 Tejun Heo <htejun@gmail.com> |
| * |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; see the file COPYING. If not, write to |
| * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, |
| * USA. |
| * |
| * |
| * 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 long 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 */ |
| ULONG_MAX, /* > 1 min has elapsed, give up */ |
| }; |
| |
| static const unsigned long 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 */ |
| ULONG_MAX, |
| }; |
| |
| static const unsigned long ata_eh_flush_timeouts[] = { |
| 15000, /* be generous with flush */ |
| 15000, /* ditto */ |
| 30000, /* and even more generous */ |
| ULONG_MAX, |
| }; |
| |
| static const unsigned long 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 */ |
| ULONG_MAX, |
| }; |
| |
| struct ata_eh_cmd_timeout_ent { |
| const u8 *commands; |
| const unsigned long *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_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 }, |
| }; |
| #undef CMDS |
| |
| static void __ata_port_freeze(struct ata_port *ap); |
| #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); |
| } |
| |
| /** |
| * 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); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| /** |
| * 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); |
| } |
| |
| #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); |
| } |
| |
| #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 long 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] != ULONG_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_unload(struct ata_port *ap) |
| { |
| struct ata_link *link; |
| struct ata_device *dev; |
| unsigned long flags; |
| |
| /* Restore SControl IPM and SPD for the next driver and |
| * disable attached devices. |
| */ |
| ata_for_each_link(link, ap, PMP_FIRST) { |
| sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0); |
| ata_for_each_dev(dev, link, ALL) |
| ata_dev_disable(dev); |
| } |
| |
| /* freeze and set UNLOADED */ |
| spin_lock_irqsave(ap->lock, flags); |
| |
| ata_port_freeze(ap); /* won't be thawed */ |
| ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */ |
| ap->pflags |= ATA_PFLAG_UNLOADED; |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| /** |
| * ata_scsi_error - SCSI layer error handler callback |
| * @host: SCSI host on which error occurred |
| * |
| * Handles SCSI-layer-thrown error events. |
| * |
| * LOCKING: |
| * Inherited from SCSI layer (none, can sleep) |
| * |
| * RETURNS: |
| * Zero. |
| */ |
| void ata_scsi_error(struct Scsi_Host *host) |
| { |
| struct ata_port *ap = ata_shost_to_port(host); |
| unsigned long flags; |
| LIST_HEAD(eh_work_q); |
| |
| DPRINTK("ENTER\n"); |
| |
| 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)); |
| |
| DPRINTK("EXIT\n"); |
| } |
| |
| /** |
| * 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; |
| |
| /* make sure sff pio task is not running */ |
| ata_sff_flush_pio_task(ap); |
| |
| /* synchronize with host lock and sort out timeouts */ |
| |
| /* For new EH, all qcs are finished in one of three ways - |
| * normal completion, error completion, and SCSI timeout. |
| * Both completions can race against SCSI timeout. When normal |
| * completion wins, the qc never reaches EH. When error |
| * completion wins, the qc has ATA_QCFLAG_FAILED set. |
| * |
| * When SCSI timeout wins, things are a bit more complex. |
| * Normal or error completion can occur after the timeout but |
| * before this point. In such cases, both types of |
| * completions are honored. A scmd is determined to have |
| * timed out iff its associated qc is active and not failed. |
| */ |
| spin_lock_irqsave(ap->lock, flags); |
| if (ap->ops->error_handler) { |
| struct scsi_cmnd *scmd, *tmp; |
| int nr_timedout = 0; |
| |
| /* 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; |
| |
| 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_FAILED)) { |
| /* which hasn't failed yet, timeout */ |
| qc->err_mask |= AC_ERR_TIMEOUT; |
| qc->flags |= ATA_QCFLAG_FAILED; |
| nr_timedout++; |
| } |
| } else { |
| /* Normal completion occurred after |
| * SCSI timeout but before this point. |
| * Successfully complete it. |
| */ |
| scmd->retries = scmd->allowed; |
| scsi_eh_finish_cmd(scmd, &ap->eh_done_q); |
| } |
| } |
| |
| /* If we have timed out qcs. They belong to EH from |
| * this point but the state of the controller is |
| * unknown. Freeze the port to make sure the IRQ |
| * handler doesn't diddle with those qcs. This must |
| * be done atomically w.r.t. setting QCFLAG_FAILED. |
| */ |
| if (nr_timedout) |
| __ata_port_freeze(ap); |
| |
| |
| /* 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; |
| |
| /* invoke error handler */ |
| if (ap->ops->error_handler) { |
| 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; |
| } |
| } |
| |
| 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); |
| } else { |
| WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL); |
| ap->ops->eng_timeout(ap); |
| } |
| |
| scsi_eh_flush_done_q(&ap->eh_done_q); |
| |
| /* clean up */ |
| spin_lock_irqsave(ap->lock, flags); |
| |
| if (ap->pflags & ATA_PFLAG_LOADING) |
| ap->pflags &= ~ATA_PFLAG_LOADING; |
| else if ((ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) && |
| !(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 int ata_eh_nr_in_flight(struct ata_port *ap) |
| { |
| struct ata_queued_cmd *qc; |
| unsigned int tag; |
| 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; |
| 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) |
| { |
| 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; |
| struct request_queue *q = qc->scsicmd->device->request_queue; |
| unsigned long flags; |
| |
| WARN_ON(!ap->ops->error_handler); |
| |
| qc->flags |= ATA_QCFLAG_FAILED; |
| ata_eh_set_pending(ap, 1); |
| |
| /* The following will fail if timeout has already expired. |
| * ata_scsi_error() takes care of such scmds on EH entry. |
| * Note that ATA_QCFLAG_FAILED is unconditionally set after |
| * this function completes. |
| */ |
| spin_lock_irqsave(q->queue_lock, flags); |
| blk_abort_request(qc->scsicmd->request); |
| spin_unlock_irqrestore(q->queue_lock, flags); |
| } |
| |
| /** |
| * 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) |
| { |
| WARN_ON(!ap->ops->error_handler); |
| |
| if (ap->pflags & ATA_PFLAG_INITIALIZING) |
| return; |
| |
| ata_eh_set_pending(ap, 1); |
| scsi_schedule_eh(ap->scsi_host); |
| |
| DPRINTK("port EH scheduled\n"); |
| } |
| 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); |
| } |
| |
| static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link) |
| { |
| struct ata_queued_cmd *qc; |
| int tag, nr_aborted = 0; |
| |
| WARN_ON(!ap->ops->error_handler); |
| |
| /* we're gonna abort all commands, no need for fast drain */ |
| ata_eh_set_pending(ap, 0); |
| |
| /* 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_FAILED; |
| ata_qc_complete(qc); |
| nr_aborted++; |
| } |
| } |
| |
| if (!nr_aborted) |
| ata_port_schedule_eh(ap); |
| |
| return nr_aborted; |
| } |
| |
| /** |
| * ata_link_abort - abort all qc's on the link |
| * @link: ATA link to abort qc's for |
| * |
| * Abort all active qc's active on @link and schedule EH. |
| * |
| * LOCKING: |
| * spin_lock_irqsave(host lock) |
| * |
| * RETURNS: |
| * Number of aborted qc's. |
| */ |
| int ata_link_abort(struct ata_link *link) |
| { |
| return ata_do_link_abort(link->ap, link); |
| } |
| |
| /** |
| * ata_port_abort - abort all qc's on the port |
| * @ap: ATA port to abort qc's for |
| * |
| * Abort all active qc's of @ap and schedule EH. |
| * |
| * LOCKING: |
| * spin_lock_irqsave(host_set lock) |
| * |
| * RETURNS: |
| * Number of aborted qc's. |
| */ |
| int ata_port_abort(struct ata_port *ap) |
| { |
| return ata_do_link_abort(ap, NULL); |
| } |
| |
| /** |
| * __ata_port_freeze - freeze port |
| * @ap: ATA port to freeze |
| * |
| * This function is called when HSM violation or some other |
| * condition disrupts normal operation of the port. Frozen port |
| * is not allowed to perform any operation until the port is |
| * thawed, which usually follows a successful reset. |
| * |
| * ap->ops->freeze() callback can be used for freezing the port |
| * hardware-wise (e.g. mask interrupt and stop DMA engine). If a |
| * port cannot be frozen hardware-wise, the interrupt handler |
| * must ack and clear interrupts unconditionally while the port |
| * is frozen. |
| * |
| * LOCKING: |
| * spin_lock_irqsave(host lock) |
| */ |
| static void __ata_port_freeze(struct ata_port *ap) |
| { |
| WARN_ON(!ap->ops->error_handler); |
| |
| if (ap->ops->freeze) |
| ap->ops->freeze(ap); |
| |
| ap->pflags |= ATA_PFLAG_FROZEN; |
| |
| DPRINTK("ata%u port frozen\n", ap->print_id); |
| } |
| |
| /** |
| * ata_port_freeze - abort & freeze port |
| * @ap: ATA port to freeze |
| * |
| * Abort and freeze @ap. 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) |
| { |
| int nr_aborted; |
| |
| WARN_ON(!ap->ops->error_handler); |
| |
| __ata_port_freeze(ap); |
| nr_aborted = ata_port_abort(ap); |
| |
| return nr_aborted; |
| } |
| |
| /** |
| * sata_async_notification - SATA async notification handler |
| * @ap: ATA port where async notification is received |
| * |
| * Handler to be called when async notification via SDB FIS is |
| * received. This function schedules EH if necessary. |
| * |
| * LOCKING: |
| * spin_lock_irqsave(host lock) |
| * |
| * RETURNS: |
| * 1 if EH is scheduled, 0 otherwise. |
| */ |
| int sata_async_notification(struct ata_port *ap) |
| { |
| u32 sntf; |
| int rc; |
| |
| if (!(ap->flags & ATA_FLAG_AN)) |
| return 0; |
| |
| rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); |
| if (rc == 0) |
| sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); |
| |
| if (!sata_pmp_attached(ap) || rc) { |
| /* PMP is not attached or SNTF is not available */ |
| if (!sata_pmp_attached(ap)) { |
| /* PMP is not attached. Check whether ATAPI |
| * AN is configured. If so, notify media |
| * change. |
| */ |
| struct ata_device *dev = ap->link.device; |
| |
| if ((dev->class == ATA_DEV_ATAPI) && |
| (dev->flags & ATA_DFLAG_AN)) |
| ata_scsi_media_change_notify(dev); |
| return 0; |
| } else { |
| /* PMP is attached but SNTF is not available. |
| * ATAPI async media change notification is |
| * not used. The PMP must be reporting PHY |
| * status change, schedule EH. |
| */ |
| ata_port_schedule_eh(ap); |
| return 1; |
| } |
| } else { |
| /* PMP is attached and SNTF is available */ |
| struct ata_link *link; |
| |
| /* check and notify ATAPI AN */ |
| ata_for_each_link(link, ap, EDGE) { |
| if (!(sntf & (1 << link->pmp))) |
| continue; |
| |
| if ((link->device->class == ATA_DEV_ATAPI) && |
| (link->device->flags & ATA_DFLAG_AN)) |
| ata_scsi_media_change_notify(link->device); |
| } |
| |
| /* If PMP is reporting that PHY status of some |
| * downstream ports has changed, schedule EH. |
| */ |
| if (sntf & (1 << SATA_PMP_CTRL_PORT)) { |
| ata_port_schedule_eh(ap); |
| return 1; |
| } |
| |
| return 0; |
| } |
| } |
| |
| /** |
| * ata_eh_freeze_port - EH helper to freeze port |
| * @ap: ATA port to freeze |
| * |
| * Freeze @ap. |
| * |
| * LOCKING: |
| * None. |
| */ |
| void ata_eh_freeze_port(struct ata_port *ap) |
| { |
| unsigned long flags; |
| |
| if (!ap->ops->error_handler) |
| return; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| __ata_port_freeze(ap); |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| /** |
| * ata_port_thaw_port - EH helper to thaw port |
| * @ap: ATA port to thaw |
| * |
| * Thaw frozen port @ap. |
| * |
| * LOCKING: |
| * None. |
| */ |
| void ata_eh_thaw_port(struct ata_port *ap) |
| { |
| unsigned long flags; |
| |
| if (!ap->ops->error_handler) |
| return; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| |
| ap->pflags &= ~ATA_PFLAG_FROZEN; |
| |
| if (ap->ops->thaw) |
| ap->ops->thaw(ap); |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| DPRINTK("ata%u port thawed\n", ap->print_id); |
| } |
| |
| static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
| { |
| /* nada */ |
| } |
| |
| static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) |
| { |
| struct ata_port *ap = qc->ap; |
| struct scsi_cmnd *scmd = qc->scsicmd; |
| unsigned long flags; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| qc->scsidone = ata_eh_scsidone; |
| __ata_qc_complete(qc); |
| WARN_ON(ata_tag_valid(qc->tag)); |
| spin_unlock_irqrestore(ap->lock, flags); |
| |
| scsi_eh_finish_cmd(scmd, &ap->eh_done_q); |
| } |
| |
| /** |
| * ata_eh_qc_complete - Complete an active ATA command from EH |
| * @qc: Command to complete |
| * |
| * Indicate to the mid and upper layers that an ATA command has |
| * completed. To be used from EH. |
| */ |
| void ata_eh_qc_complete(struct ata_queued_cmd *qc) |
| { |
| struct scsi_cmnd *scmd = qc->scsicmd; |
| scmd->retries = scmd->allowed; |
| __ata_eh_qc_complete(qc); |
| } |
| |
| /** |
| * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH |
| * @qc: Command to retry |
| * |
| * Indicate to the mid and upper layers that an ATA command |
| * should be retried. To be used from EH. |
| * |
| * SCSI midlayer limits the number of retries to scmd->allowed. |
| * scmd->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; |
| |
| if (ata_msg_drv(dev->link->ap)) |
| ata_dev_warn(dev, "disabled\n"); |
| 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_eh_detach_dev - detach ATA device |
| * @dev: ATA device to detach |
| * |
| * Detach @dev. |
| * |
| * LOCKING: |
| * None. |
| */ |
| void ata_eh_detach_dev(struct ata_device *dev) |
| { |
| struct ata_link *link = dev->link; |
| struct ata_port *ap = link->ap; |
| struct ata_eh_context *ehc = &link->eh_context; |
| unsigned long flags; |
| |
| ata_dev_disable(dev); |
| |
| spin_lock_irqsave(ap->lock, flags); |
| |
| dev->flags &= ~ATA_DFLAG_DETACH; |
| |
| if (ata_scsi_offline_dev(dev)) { |
| dev->flags |= ATA_DFLAG_DETACHED; |
| ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
| } |
| |
| /* clear per-dev EH info */ |
| ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK); |
| ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK); |
| ehc->saved_xfer_mode[dev->devno] = 0; |
| ehc->saved_ncq_enabled &= ~(1 << dev->devno); |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| /** |
| * ata_eh_about_to_do - about to perform eh_action |
| * @link: target ATA link |
| * @dev: target ATA dev for per-dev action (can be NULL) |
| * @action: action about to be performed |
| * |
| * Called just before performing EH actions to clear related bits |
| * in @link->eh_info such that eh actions are not unnecessarily |
| * repeated. |
| * |
| * LOCKING: |
| * None. |
| */ |
| void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev, |
| unsigned int action) |
| { |
| struct ata_port *ap = link->ap; |
| struct ata_eh_info *ehi = &link->eh_info; |
| struct ata_eh_context *ehc = &link->eh_context; |
| unsigned long flags; |
| |
| spin_lock_irqsave(ap->lock, flags); |
| |
| ata_eh_clear_action(link, dev, ehi, action); |
| |
| /* About to take EH action, set RECOVERED. Ignore actions on |
| * slave links as master will do them again. |
| */ |
| if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link) |
| ap->pflags |= ATA_PFLAG_RECOVERED; |
| |
| spin_unlock_irqrestore(ap->lock, flags); |
| } |
| |
| /** |
| * ata_eh_done - EH action complete |
| * @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; |
| |
| 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"; |
| } |
| |
| /** |
| * ata_eh_read_log_10h - Read log page 10h for NCQ error details |
| * @dev: Device to read log page 10h from |
| * @tag: Resulting tag of the failed command |
| * @tf: Resulting taskfile registers of the failed command |
| * |
| * Read log page 10h to obtain NCQ error details and clear error |
| * condition. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, -errno otherwise. |
| */ |
| static int ata_eh_read_log_10h(struct ata_device *dev, |
| int *tag, struct ata_taskfile *tf) |
| { |
| u8 *buf = dev->link->ap->sector_buf; |
| unsigned int err_mask; |
| u8 csum; |
| int i; |
| |
| err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1); |
| if (err_mask) |
| return -EIO; |
| |
| csum = 0; |
| for (i = 0; i < ATA_SECT_SIZE; i++) |
| csum += buf[i]; |
| if (csum) |
| ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n", |
| csum); |
| |
| if (buf[0] & 0x80) |
| return -ENOENT; |
| |
| *tag = buf[0] & 0x1f; |
| |
| tf->command = buf[2]; |
| tf->feature = buf[3]; |
| tf->lbal = buf[4]; |
| tf->lbam = buf[5]; |
| tf->lbah = buf[6]; |
| tf->device = buf[7]; |
| tf->hob_lbal = buf[8]; |
| tf->hob_lbam = buf[9]; |
| tf->hob_lbah = buf[10]; |
| tf->nsect = buf[12]; |
| tf->hob_nsect = buf[13]; |
| if (dev->class == ATA_DEV_ZAC && ata_id_has_ncq_autosense(dev->id)) |
| tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16]; |
| |
| return 0; |
| } |
| |
| /** |
| * atapi_eh_tur - perform ATAPI TEST_UNIT_READY |
| * @dev: target ATAPI device |
| * @r_sense_key: out parameter for sense_key |
| * |
| * Perform ATAPI TEST_UNIT_READY. |
| * |
| * LOCKING: |
| * EH context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, AC_ERR_* mask on failure. |
| */ |
| unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key) |
| { |
| u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 }; |
| struct ata_taskfile tf; |
| unsigned int err_mask; |
| |
| ata_tf_init(dev, &tf); |
| |
| tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; |
| tf.command = ATA_CMD_PACKET; |
| tf.protocol = ATAPI_PROT_NODATA; |
| |
| err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0); |
| if (err_mask == AC_ERR_DEV) |
| *r_sense_key = tf.feature >> 4; |
| return err_mask; |
| } |
| |
| /** |
| * ata_eh_request_sense - perform REQUEST_SENSE_DATA_EXT |
| * @qc: qc to perform REQUEST_SENSE_SENSE_DATA_EXT to |
| * @cmd: scsi command for which the sense code should be set |
| * |
| * Perform REQUEST_SENSE_DATA_EXT after the device reported CHECK |
| * SENSE. This function is an EH helper. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| */ |
| static void ata_eh_request_sense(struct ata_queued_cmd *qc, |
| struct scsi_cmnd *cmd) |
| { |
| struct ata_device *dev = qc->dev; |
| struct ata_taskfile tf; |
| unsigned int err_mask; |
| |
| if (qc->ap->pflags & ATA_PFLAG_FROZEN) { |
| ata_dev_warn(dev, "sense data available but port frozen\n"); |
| return; |
| } |
| |
| if (!cmd || qc->flags & ATA_QCFLAG_SENSE_VALID) |
| return; |
| |
| if (!ata_id_sense_reporting_enabled(dev->id)) { |
| ata_dev_warn(qc->dev, "sense data reporting disabled\n"); |
| return; |
| } |
| |
| DPRINTK("ATA request sense\n"); |
| |
| 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.command & ATA_SENSE) { |
| ata_scsi_set_sense(dev, cmd, tf.lbah, tf.lbam, tf.lbal); |
| qc->flags |= ATA_QCFLAG_SENSE_VALID; |
| } else { |
| ata_dev_warn(dev, "request sense failed stat %02x emask %x\n", |
| tf.command, err_mask); |
| } |
| } |
| |
| /** |
| * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE |
| * @dev: device to perform REQUEST_SENSE to |
| * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) |
| * @dfl_sense_key: default sense key to use |
| * |
| * Perform ATAPI REQUEST_SENSE after the device reported CHECK |
| * SENSE. This function is EH helper. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| * |
| * RETURNS: |
| * 0 on success, AC_ERR_* mask on failure |
| */ |
| unsigned int atapi_eh_request_sense(struct ata_device *dev, |
| u8 *sense_buf, u8 dfl_sense_key) |
| { |
| u8 cdb[ATAPI_CDB_LEN] = |
| { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 }; |
| struct ata_port *ap = dev->link->ap; |
| struct ata_taskfile tf; |
| |
| DPRINTK("ATAPI request sense\n"); |
| |
| 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_ncq_error - analyze NCQ error |
| * @link: ATA link to analyze NCQ error for |
| * |
| * Read log page 10h, determine the offending qc and acquire |
| * error status TF. For NCQ device errors, all LLDDs have to do |
| * is setting AC_ERR_DEV in ehi->err_mask. This function takes |
| * care of the rest. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| */ |
| void ata_eh_analyze_ncq_error(struct ata_link *link) |
| { |
| struct ata_port *ap = link->ap; |
| struct ata_eh_context *ehc = &link->eh_context; |
| struct ata_device *dev = link->device; |
| struct ata_queued_cmd *qc; |
| struct ata_taskfile tf; |
| int tag, rc; |
| |
| /* if frozen, we can't do much */ |
| if (ap->pflags & ATA_PFLAG_FROZEN) |
| return; |
| |
| /* is it NCQ device error? */ |
| if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) |
| return; |
| |
| /* has LLDD analyzed already? */ |
| ata_qc_for_each_raw(ap, qc, tag) { |
| if (!(qc->flags & ATA_QCFLAG_FAILED)) |
| continue; |
| |
| if (qc->err_mask) |
| return; |
| } |
| |
| /* okay, this error is ours */ |
| memset(&tf, 0, sizeof(tf)); |
| rc = ata_eh_read_log_10h(dev, &tag, &tf); |
| if (rc) { |
| ata_link_err(link, "failed to read log page 10h (errno=%d)\n", |
| rc); |
| return; |
| } |
| |
| if (!(link->sactive & (1 << tag))) { |
| ata_link_err(link, "log page 10h reported inactive tag %d\n", |
| tag); |
| return; |
| } |
| |
| /* we've got the perpetrator, condemn it */ |
| qc = __ata_qc_from_tag(ap, tag); |
| memcpy(&qc->result_tf, &tf, sizeof(tf)); |
| qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48; |
| qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; |
| if (dev->class == ATA_DEV_ZAC && |
| ((qc->result_tf.command & ATA_SENSE) || qc->result_tf.auxiliary)) { |
| char sense_key, asc, ascq; |
| |
| sense_key = (qc->result_tf.auxiliary >> 16) & 0xff; |
| asc = (qc->result_tf.auxiliary >> 8) & 0xff; |
| ascq = qc->result_tf.auxiliary & 0xff; |
| ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc, ascq); |
| ata_scsi_set_sense_information(dev, qc->scsicmd, |
| &qc->result_tf); |
| qc->flags |= ATA_QCFLAG_SENSE_VALID; |
| } |
| |
| ehc->i.err_mask &= ~AC_ERR_DEV; |
| } |
| |
| /** |
| * ata_eh_analyze_tf - analyze taskfile of a failed qc |
| * @qc: qc to analyze |
| * @tf: Taskfile registers to analyze |
| * |
| * Analyze taskfile of @qc and further determine cause of |
| * failure. This function also requests ATAPI sense data if |
| * 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) |
| { |
| unsigned int tmp, action = 0; |
| u8 stat = tf->command, err = tf->feature; |
| |
| if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { |
| qc->err_mask |= AC_ERR_HSM; |
| return ATA_EH_RESET; |
| } |
| |
| if (stat & (ATA_ERR | ATA_DF)) { |
| qc->err_mask |= AC_ERR_DEV; |
| /* |
| * 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_ZAC: |
| if (stat & ATA_SENSE) |
| ata_eh_request_sense(qc, qc->scsicmd); |
| /* fall through */ |
| case ATA_DEV_ATA: |
| 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 (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
| tmp = atapi_eh_request_sense(qc->dev, |
| qc->scsicmd->sense_buffer, |
| qc->result_tf.feature >> 4); |
| if (!tmp) |
| qc->flags |= ATA_QCFLAG_SENSE_VALID; |
| else |
| qc->err_mask |= tmp; |
| } |
| } |
| |
| if (qc->flags & ATA_QCFLAG_SENSE_VALID) { |
| int ret = scsi_check_sense(qc->scsicmd); |
| /* |
| * 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) && |
| (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | |
| ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { |
| 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 && |
| qc->scsicmd->request->rq_flags & RQF_QUIET) |
| qc->flags |= ATA_QCFLAG_QUIET; |
| return qc->flags & ATA_QCFLAG_QUIET; |
| } |
| |
| /** |
| * 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; |
| |
| DPRINTK("ENTER\n"); |
| |
| if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
| return; |
| |
| /* obtain and analyze SError */ |
| rc = sata_scr_read(link, SCR_ERROR, &serror); |
| if (rc == 0) { |
| ehc->i.serror |= serror; |
| ata_eh_analyze_serror(link); |
| } else if (rc != -EOPNOTSUPP) { |
| /* SError read failed, force reset and probing */ |
| ehc->i.probe_mask |= ATA_ALL_DEVICES; |
| ehc->i.action |= ATA_EH_RESET; |
| ehc->i.err_mask |= AC_ERR_OTHER; |
| } |
| |
| /* analyze NCQ failure */ |
| ata_eh_analyze_ncq_error(link); |
| |
| /* any real error trumps AC_ERR_OTHER */ |
| if (ehc->i.err_mask & ~AC_ERR_OTHER) |
| ehc->i.err_mask &= ~AC_ERR_OTHER; |
| |
| all_err_mask |= ehc->i.err_mask; |
| |
| ata_qc_for_each_raw(ap, qc, tag) { |
| if (!(qc->flags & ATA_QCFLAG_FAILED) || |
| ata_dev_phys_link(qc->dev) != link) |
| continue; |
| |
| /* inherit upper level err_mask */ |
| qc->err_mask |= ehc->i.err_mask; |
| |
| /* analyze TF */ |
| ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
| |
| /* DEV errors are probably spurious in case of ATA_BUS error */ |
| if (qc->err_mask & AC_ERR_ATA_BUS) |
| qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | |
| AC_ERR_INVALID); |
| |
| /* any real error trumps unknown error */ |
| if (qc->err_mask & ~AC_ERR_OTHER) |
| qc->err_mask &= ~AC_ERR_OTHER; |
| |
| /* |
| * SENSE_VALID trumps dev/unknown error and revalidation. 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 (ap->pflags & ATA_PFLAG_FROZEN || |
| all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
| ehc->i.action |= ATA_EH_RESET; |
| else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) || |
| (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV))) |
| ehc->i.action |= ATA_EH_REVALIDATE; |
| |
| /* If we have offending qcs and the associated failed device, |
| * perform per-dev EH action only on the offending device. |
| */ |
| if (ehc->i.dev) { |
| ehc->i.dev_action[ehc->i.dev->devno] |= |
| ehc->i.action & ATA_EH_PERDEV_MASK; |
| ehc->i.action &= ~ATA_EH_PERDEV_MASK; |
| } |
| |
| /* propagate timeout to host link */ |
| if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link)) |
| ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT; |
| |
| /* record error and consider speeding down */ |
| dev = ehc->i.dev; |
| if (!dev && ((ata_link_max_devices(link) == 1 && |
| ata_dev_enabled(link->device)))) |
| dev = link->device; |
| |
| if (dev) { |
| if (dev->flags & ATA_DFLAG_DUBIOUS_XFER) |
| eflags |= ATA_EFLAG_DUBIOUS_XFER; |
| ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask); |
| trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask); |
| } |
| DPRINTK("EXIT\n"); |
| } |
| |
| /** |
| * ata_eh_autopsy - analyze error and determine recovery action |
| * @ap: host port to perform autopsy on |
| * |
| * Analyze all links of @ap and determine why they failed and |
| * which recovery actions are needed. |
| * |
| * LOCKING: |
| * Kernel thread context (may sleep). |
| */ |
| void ata_eh_autopsy(struct ata_port *ap) |
| { |
| struct ata_link *link; |
| |
| ata_for_each_link(link, ap, EDGE) |
| ata_eh_link_autopsy(link); |
| |
| /* Handle the frigging slave link. Autopsy is done similarly |
| * but actions and flags are transferred over to the master |
| * link and handled from there. |
| */ |
| if (ap->slave_link) { |
| struct ata_eh_context *mehc = &ap->link.eh_context; |
| struct ata_eh_context *sehc = &ap->slave_link->eh_context; |
| |
| /* transfer control flags from master to slave */ |
| sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK; |
| |
| /* perform autopsy on the slave link */ |
| ata_eh_link_autopsy(ap->slave_link); |
| |
| /* transfer actions from slave to master and clear slave */ |
| ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS); |
| mehc->i.action |= sehc->i.action; |
| mehc->i.dev_action[1] |= sehc->i.dev_action[1]; |
| mehc->i.flags |= sehc->i.flags; |
| ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS); |
| } |
| |
| /* Autopsy of fanout ports can affect host link autopsy. |
| * Perform host link autopsy last. |
| */ |
| if (sata_pmp_attached(ap)) |
| ata_eh_link_autopsy(&ap->link); |
| } |
| |
| /** |
| * ata_get_cmd_descript - get description for ATA command |
| * @command: ATA command code to get description for |
| * |
| * Return a textual description of the given command, or NULL if the |
| * command is not known. |
| * |
| * LOCKING: |
| * None |
| */ |
| const char *ata_get_cmd_descript(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_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 NULL; |
| } |
| EXPORT_SYMBOL_GPL(ata_get_cmd_descript); |
| |
| /** |
| * 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[6] = ""; |
| int tag, nr_failed = 0; |
| |
| if (ehc->i.flags & ATA_EHI_QUIET) |
| return; |
| |
| desc = NULL; |
| if (ehc->i.desc[0] != '\0') |
| desc = ehc->i.desc; |
| |
| ata_qc_for_each_raw(ap, qc, tag) { |
| if (!(qc->flags & ATA_QCFLAG_FAILED) || |
| ata_dev_phys_link(qc->dev) != link || |
| ((qc->flags & ATA_QCFLAG_QUIET) && |
| qc->err_mask == AC_ERR_DEV)) |
| continue; |
| if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) |
| continue; |
| |
| nr_failed++; |
| } |
| |
| if (!nr_failed && !ehc->i.err_mask) |
| return; |
| |
| frozen = ""; |
| if (ap->pflags & ATA_PFLAG_FROZEN) |
| frozen = " frozen"; |
| |
| 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_FAILED) || |
| ata_dev_phys_link(qc->dev) != link || !qc->err_mask) |
| continue; |
| |
| if (qc->dma_dir != DMA_NONE) { |
| static const char *dma_str[] = { |
| [DMA_BIDIRECTIONAL] = "bidi", |
| [DMA_TO_DEVICE] = "out", |
| [DMA_FROM_DEVICE] = "in", |
| }; |
| 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 { |
| const char *descr = ata_get_cmd_descript(cmd->command); |
| if (descr) |
| ata_dev_err(qc->dev, "failed command: %s\n", |
| descr); |
| } |
| |
| 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->command, res->feature, res->nsect, |
| res->lbal, res->lbam, res->lbah, |
| res->hob_feature, res->hob_nsect, |
| res->hob_lbal, res->hob_lbam, res->hob_lbah, |
| res->device, qc->err_mask, ata_err_string(qc->err_mask), |
| qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); |
| |
| #ifdef CONFIG_ATA_VERBOSE_ERROR |
| if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | |
| ATA_SENSE | ATA_ERR)) { |
| if (res->command & ATA_BUSY) |
| ata_dev_err(qc->dev, "status: { Busy }\n"); |
| else |
| ata_dev_err(qc->dev, "status: { %s%s%s%s%s}\n", |
| res->command & ATA_DRDY ? "DRDY " : "", |
| res->command & ATA_DF ? "DF " : "", |
| res->command & ATA_DRQ ? "DRQ " : "", |
| res->command & ATA_SENSE ? "SENSE " : "", |
| res->command & ATA_ERR ? "ERR " : ""); |
| } |
| |
| if (cmd->command != ATA_CMD_PACKET && |
| (res->feature & (ATA_ICRC | ATA_UNC | ATA_AMNF | |
| ATA_IDNF | ATA_ABORTED))) |
| ata_dev_err(qc->dev, "error: { %s%s%s%s%s}\n", |
| res->feature & ATA_ICRC ? "ICRC " : "", |
| res->feature & ATA_UNC ? "UNC " : "", |
| res->feature & ATA_AMNF ? "AMNF " : "", |
| res->feature & ATA_IDNF ? "IDNF " : "", |
| res->feature & 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] != ULONG_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 ((ap->pflags & ATA_PFLAG_FROZEN) && |
| 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; |
| else |
| ehc->i.flags |= ATA_EHI_DID_SOFTRESET; |
| |
| rc = ata_do_reset(link, reset, classes, deadline, true); |
| if (rc && rc != -EAGAIN) { |
| failed_link = link; |
| goto fail; |
| } |
| |
| /* hardreset slave link if existent */ |
| if (slave && reset == hardreset) { |
| int tmp; |
| |
| if (verbose) |
| ata_link_info(slave, "hard resetting link\n"); |
| |
| ata_eh_about_to_do(slave, NULL, ATA_EH_RESET); |
| tmp = ata_do_reset(slave, reset, classes, deadline, |
| false); |
| switch (tmp) { |
| case -EAGAIN: |
| rc = -EAGAIN; |
| case 0: |
| break; |
| default: |
| failed_link = slave; |
| rc = tmp; |
| goto fail; |
| } |
| } |
| |
| /* perform follow-up SRST if necessary */ |
| if (reset == hardreset && |
| ata_eh_followup_srst_needed(link, rc)) { |
| 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); |
| rc = ata_do_reset(link, reset, classes, deadline, true); |
| 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); |
| if (slave) |
| postreset(slave, classes); |
| } |
| |
| /* |
| * Some controllers can't be frozen very well and may set spurious |
| * error conditions during reset. Clear accumulated error |
| * information and re-thaw the port if frozen. As reset is the |
| * final recovery action and we cross check link onlineness against |
| * device classification later, no hotplug event is lost by this. |
| */ |
| spin_lock_irqsave(link->ap->lock, flags); |
| memset(&link->eh_info, 0, sizeof(link->eh_info)); |
| if (slave) |
| memset(&slave->eh_info, 0, sizeof(link->eh_info)); |
| ap->pflags &= ~ATA_PFLAG_EH_PENDING; |
| spin_unlock_irqrestore(link->ap->lock, flags); |
| |
| if (ap->pflags & ATA_PFLAG_FROZEN) |
| ata_eh_thaw_port(ap); |
| |
| /* |
| * 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); |
| 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; |
| |
| DPRINTK("ENTER\n"); |
| |
| /* For PATA drive side cable detection to work, IDENTIFY must |
| * be done backwards such that PDIAG- is released by the slave |
| * device before the master device is identified. |
| */ |
| ata_for_each_dev(dev, link, ALL_REVERSE) { |
| unsigned int action = ata_eh_dev_action(dev); |
| unsigned int readid_flags = 0; |
| |
| if (ehc->i.flags & ATA_EHI_DID_RESET) |
| readid_flags |= ATA_READID_POSTRESET; |
| |
| if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { |
| WARN_ON(dev->class == ATA_DEV_PMP); |
| |
| if (ata_phys_link_offline(ata_dev_phys_link(dev))) { |
| rc = -EIO; |
| goto err; |
| } |
| |
| ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE); |
| rc = ata_dev_revalidate(dev, ehc->classes[dev->devno], |
| readid_flags); |
| if (rc) |
| goto err; |
| |
| ata_eh_done(link, dev, ATA_EH_REVALIDATE); |
| |
| /* Configuration may have changed, reconfigure |
| * transfer mode. |
| */ |
| ehc->i.flags |= ATA_EHI_SETMODE; |
| |
| /* schedule the scsi_rescan_device() here */ |
| schedule_work(&(ap->scsi_rescan_task)); |
| } 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
|