diff options
Diffstat (limited to 'drivers/ata/libata-eh.c')
| -rw-r--r-- | drivers/ata/libata-eh.c | 3423 |
1 files changed, 3423 insertions, 0 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c new file mode 100644 index 0000000..97a7dbc --- /dev/null +++ b/drivers/ata/libata-eh.c @@ -0,0 +1,3423 @@ +/* + * libata-eh.c - libata error handling + * + * Maintained by: Jeff Garzik <jgarzik@pobox.com> + * 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/DocBook/libata.* + * + * Hardware documentation available from http://www.t13.org/ and + * http://www.sata-io.org/ + * + */ + +#include <linux/kernel.h> +#include <linux/blkdev.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_transport_api.h" + +#include <linux/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), + + /* 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, +}; + +/* 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 retarded devices. + */ +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 retarded 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_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, }, +}; +#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 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; +} + +static void ata_ering_clear(struct ata_ering *ering) +{ + memset(ering, 0, sizeof(*ering)); +} + +static 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 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_link_for_each_dev(tdev, link) + 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_link_for_each_dev(tdev, link) + 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_scsi_timed_out - SCSI layer time out callback + * @cmd: timed out SCSI command + * + * Handles SCSI layer timeout. We race with normal completion of + * the qc for @cmd. If the qc is already gone, we lose and let + * the scsi command finish (EH_HANDLED). Otherwise, the qc has + * timed out and EH should be invoked. Prevent ata_qc_complete() + * from finishing it by setting EH_SCHEDULED and return + * EH_NOT_HANDLED. + * + * TODO: kill this function once old EH is gone. + * + * LOCKING: + * Called from timer context + * + * RETURNS: + * EH_HANDLED or EH_NOT_HANDLED + */ +enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) +{ + struct Scsi_Host *host = cmd->device->host; + struct ata_port *ap = ata_shost_to_port(host); + unsigned long flags; + struct ata_queued_cmd *qc; + enum blk_eh_timer_return ret; + + DPRINTK("ENTER\n"); + + if (ap->ops->error_handler) { + ret = BLK_EH_NOT_HANDLED; + goto out; + } + + ret = BLK_EH_HANDLED; + spin_lock_irqsave(ap->lock, flags); + qc = ata_qc_from_tag(ap, ap->link.active_tag); + if (qc) { + WARN_ON(qc->scsicmd != cmd); + qc->flags |= ATA_QCFLAG_EH_SCHEDULED; + qc->err_mask |= AC_ERR_TIMEOUT; + ret = BLK_EH_NOT_HANDLED; + } + spin_unlock_irqrestore(ap->lock, flags); + + out: + DPRINTK("EXIT, ret=%d\n", ret); + return ret; +} + +/** + * ata_scsi_error - SCSI layer error handler callback + * @host: SCSI host on which error occurred + * + * Handles SCSI-layer-thrown error events. + * + * LOCKING: + * Inherited from SCSI layer (none, can sleep) + * + * RETURNS: + * Zero. + */ +void ata_scsi_error(struct Scsi_Host *host) +{ + struct ata_port *ap = ata_shost_to_port(host); + int i; + unsigned long flags; + + DPRINTK("ENTER\n"); + + /* synchronize with port task */ + ata_port_flush_task(ap); + + /* synchronize with host lock and sort out timeouts */ + + /* For new EH, all qcs are finished in one of three ways - + * normal completion, error completion, and SCSI timeout. + * Both cmpletions can race against SCSI timeout. When normal + * completion wins, the qc never reaches EH. When error + * completion wins, the qc has ATA_QCFLAG_FAILED set. + * + * When SCSI timeout wins, things are a bit more complex. + * Normal or error completion can occur after the timeout but + * before this point. In such cases, both types of + * completions are honored. A scmd is determined to have + * timed out iff its associated qc is active and not failed. + */ + if (ap->ops->error_handler) { + struct scsi_cmnd *scmd, *tmp; + int nr_timedout = 0; + + spin_lock_irqsave(ap->lock, flags); + + list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { + struct ata_queued_cmd *qc; + + for (i = 0; i < ATA_MAX_QUEUE; i++) { + qc = __ata_qc_from_tag(ap, i); + if (qc->flags & ATA_QCFLAG_ACTIVE && + qc->scsicmd == scmd) + break; + } + + if (i < ATA_MAX_QUEUE) { + /* the scmd has an associated qc */ + if (!(qc->flags & ATA_QCFLAG_FAILED)) { + /* which hasn't failed yet, timeout */ + qc->err_mask |= AC_ERR_TIMEOUT; + qc->flags |= ATA_QCFLAG_FAILED; + nr_timedout++; + } + } else { + /* Normal completion occurred after + * SCSI timeout but before this point. + * Successfully complete it. + */ + scmd->retries = scmd->allowed; + scsi_eh_finish_cmd(scmd, &ap->eh_done_q); + } + } + + /* If we have timed out qcs. They belong to EH from + * this point but the state of the controller is + * unknown. Freeze the port to make sure the IRQ + * handler doesn't diddle with those qcs. This must + * be done atomically w.r.t. setting QCFLAG_FAILED. + */ + if (nr_timedout) + __ata_port_freeze(ap); + + spin_unlock_irqrestore(ap->lock, flags); + + /* initialize eh_tries */ + ap->eh_tries = ATA_EH_MAX_TRIES; + } else + spin_unlock_wait(ap->lock); + + repeat: + /* invoke error handler */ + if (ap->ops->error_handler) { + struct ata_link *link; + + /* kill fast drain timer */ + del_timer_sync(&ap->fastdrain_timer); + + /* process port resume request */ + ata_eh_handle_port_resume(ap); + + /* fetch & clear EH info */ + spin_lock_irqsave(ap->lock, flags); + + __ata_port_for_each_link(link, ap) { + 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_link_for_each_dev(dev, link) { + int devno = dev->devno; + + if (!ata_dev_enabled(dev)) + continue; + + 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 + ata_eh_finish(ap); + + /* process port suspend request */ + ata_eh_handle_port_suspend(ap); + + /* Exception might have happend after ->error_handler + * recovered the port but before this point. Repeat + * EH in such case. + */ + spin_lock_irqsave(ap->lock, flags); + + if (ap->pflags & ATA_PFLAG_EH_PENDING) { + if (--ap->eh_tries) { + spin_unlock_irqrestore(ap->lock, flags); + goto repeat; + } + ata_port_printk(ap, KERN_ERR, "EH pending after %d " + "tries, giving up\n", ATA_EH_MAX_TRIES); + ap->pflags &= ~ATA_PFLAG_EH_PENDING; + } + + /* this run is complete, make sure EH info is clear */ + __ata_port_for_each_link(link, ap) + memset(&link->eh_info, 0, sizeof(link->eh_info)); + + /* Clear host_eh_scheduled while holding ap->lock such + * that if exception occurs after this point but + * before EH completion, SCSI midlayer will + * re-initiate EH. + */ + host->host_eh_scheduled = 0; + + spin_unlock_irqrestore(ap->lock, flags); + } else { + WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL); + ap->ops->eng_timeout(ap); + } + + /* finish or retry handled scmd's and clean up */ + WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); + + scsi_eh_flush_done_q(&ap->eh_done_q); + + /* clean up */ + spin_lock_irqsave(ap->lock, flags); + + if (ap->pflags & ATA_PFLAG_LOADING) + ap->pflags &= ~ATA_PFLAG_LOADING; + else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) + queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); + + if (ap->pflags & ATA_PFLAG_RECOVERED) + ata_port_printk(ap, KERN_INFO, "EH complete\n"); + + ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); + + /* tell wait_eh that we're done */ + ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; + wake_up_all(&ap->eh_wait_q); + + spin_unlock_irqrestore(ap->lock, flags); + + DPRINTK("EXIT\n"); +} + +/** + * ata_port_wait_eh - Wait for the currently pending EH to complete + * @ap: Port to wait EH for + * + * Wait until the currently pending EH is complete. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_port_wait_eh(struct ata_port *ap) +{ + unsigned long flags; + DEFINE_WAIT(wait); + + retry: + spin_lock_irqsave(ap->lock, flags); + + while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { + prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); + spin_unlock_irqrestore(ap->lock, flags); + schedule(); + spin_lock_irqsave(ap->lock, flags); + } + finish_wait(&ap->eh_wait_q, &wait); + + spin_unlock_irqrestore(ap->lock, flags); + + /* make sure SCSI EH is complete */ + if (scsi_host_in_recovery(ap->scsi_host)) { + msleep(10); + goto retry; + } +} + +static int ata_eh_nr_in_flight(struct ata_port *ap) +{ + unsigned int tag; + int nr = 0; + + /* count only non-internal commands */ + for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) + if (ata_qc_from_tag(ap, tag)) + nr++; + + return nr; +} + +void ata_eh_fastdrain_timerfn(unsigned long arg) +{ + struct ata_port *ap = (void *)arg; + unsigned long flags; + int cnt; + + spin_lock_irqsave(ap->lock, flags); + + cnt = ata_eh_nr_in_flight(ap); + + /* are we done? */ + if (!cnt) + goto out_unlock; + + if (cnt == ap->fastdrain_cnt) { + unsigned int tag; + + /* No progress during the last interval, tag all + * in-flight qcs as timed out and freeze the port. + */ + for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) { + struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); + if (qc) + qc->err_mask |= AC_ERR_TIMEOUT; + } + + ata_port_freeze(ap); + } else { + /* some qcs have finished, give it another chance */ + ap->fastdrain_cnt = cnt; + ap->fastdrain_timer.expires = + ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL); + add_timer(&ap->fastdrain_timer); + } + + out_unlock: + spin_unlock_irqrestore(ap->lock, flags); +} + +/** + * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain + * @ap: target ATA port + * @fastdrain: activate fast drain + * + * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain + * is non-zero and EH wasn't pending before. Fast drain ensures + * that EH kicks in in timely manner. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) +{ + int cnt; + + /* already scheduled? */ + if (ap->pflags & ATA_PFLAG_EH_PENDING) + return; + + ap->pflags |= ATA_PFLAG_EH_PENDING; + + if (!fastdrain) + return; + + /* do we have in-flight qcs? */ + cnt = ata_eh_nr_in_flight(ap); + if (!cnt) + return; + + /* activate fast drain */ + ap->fastdrain_cnt = cnt; + ap->fastdrain_timer.expires = + ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL); + add_timer(&ap->fastdrain_timer); +} + +/** + * ata_qc_schedule_eh - schedule qc for error handling + * @qc: command to schedule error handling for + * + * Schedule error handling for @qc. EH will kick in as soon as + * other commands are drained. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +void ata_qc_schedule_eh(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + + WARN_ON(!ap->ops->error_handler); + + qc->flags |= ATA_QCFLAG_FAILED; + ata_eh_set_pending(ap, 1); + + /* The following will fail if timeout has already expired. + * ata_scsi_error() takes care of such scmds on EH entry. + * Note that ATA_QCFLAG_FAILED is unconditionally set after + * this function completes. + */ + blk_abort_request(qc->scsicmd->request); +} + +/** + * ata_port_schedule_eh - schedule error handling without a qc + * @ap: ATA port to schedule EH for + * + * Schedule error handling for @ap. EH will kick in as soon as + * all commands are drained. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +void ata_port_schedule_eh(struct ata_port *ap) +{ + WARN_ON(!ap->ops->error_handler); + + if (ap->pflags & ATA_PFLAG_INITIALIZING) + return; + + ata_eh_set_pending(ap, 1); + scsi_schedule_eh(ap->scsi_host); + + DPRINTK("port EH scheduled\n"); +} + +static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link) +{ + int tag, nr_aborted = 0; + + WARN_ON(!ap->ops->error_handler); + + /* we're gonna abort all commands, no need for fast drain */ + ata_eh_set_pending(ap, 0); + + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); + + if (qc && (!link || qc->dev->link == link)) { + qc->flags |= ATA_QCFLAG_FAILED; + ata_qc_complete(qc); + nr_aborted++; + } + } + + if (!nr_aborted) + ata_port_schedule_eh(ap); + + return nr_aborted; +} + +/** + * ata_link_abort - abort all qc's on the link + * @link: ATA link to abort qc's for + * + * Abort all active qc's active on @link and schedule EH. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Number of aborted qc's. + */ +int ata_link_abort(struct ata_link *link) +{ + return ata_do_link_abort(link->ap, link); +} + +/** + * ata_port_abort - abort all qc's on the port + * @ap: ATA port to abort qc's for + * + * Abort all active qc's of @ap and schedule EH. + * + * LOCKING: + * spin_lock_irqsave(host_set lock) + * + * RETURNS: + * Number of aborted qc's. + */ +int ata_port_abort(struct ata_port *ap) +{ + return ata_do_link_abort(ap, NULL); +} + +/** + * __ata_port_freeze - freeze port + * @ap: ATA port to freeze + * + * This function is called when HSM violation or some other + * condition disrupts normal operation of the port. Frozen port + * is not allowed to perform any operation until the port is + * thawed, which usually follows a successful reset. + * + * ap->ops->freeze() callback can be used for freezing the port + * hardware-wise (e.g. mask interrupt and stop DMA engine). If a + * port cannot be frozen hardware-wise, the interrupt handler + * must ack and clear interrupts unconditionally while the port + * is frozen. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static void __ata_port_freeze(struct ata_port *ap) +{ + WARN_ON(!ap->ops->error_handler); + + if (ap->ops->freeze) + ap->ops->freeze(ap); + + ap->pflags |= ATA_PFLAG_FROZEN; + + DPRINTK("ata%u port frozen\n", ap->print_id); +} + +/** + * ata_port_freeze - abort & freeze port + * @ap: ATA port to freeze + * + * Abort and freeze @ap. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Number of aborted commands. + */ +int ata_port_freeze(struct ata_port *ap) +{ + int nr_aborted; + + WARN_ON(!ap->ops->error_handler); + + nr_aborted = ata_port_abort(ap); + __ata_port_freeze(ap); + + return nr_aborted; +} + +/** + * sata_async_notification - SATA async notification handler + * @ap: ATA port where async notification is received + * + * Handler to be called when async notification via SDB FIS is + * received. This function schedules EH if necessary. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * 1 if EH is scheduled, 0 otherwise. + */ +int sata_async_notification(struct ata_port *ap) +{ + u32 sntf; + int rc; + + if (!(ap->flags & ATA_FLAG_AN)) + return 0; + + rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); + if (rc == 0) + sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); + + if (!sata_pmp_attached(ap) || rc) { + /* PMP is not attached or SNTF is not available */ + if (!sata_pmp_attached(ap)) { + /* PMP is not attached. Check whether ATAPI + * AN is configured. If so, notify media + * change. + */ + struct ata_device *dev = ap->link.device; + + if ((dev->class == ATA_DEV_ATAPI) && + (dev->flags & ATA_DFLAG_AN)) + ata_scsi_media_change_notify(dev); + return 0; + } else { + /* PMP is attached but SNTF is not available. + * ATAPI async media change notification is + * not used. The PMP must be reporting PHY + * status change, schedule EH. + */ + ata_port_schedule_eh(ap); + return 1; + } + } else { + /* PMP is attached and SNTF is available */ + struct ata_link *link; + + /* check and notify ATAPI AN */ + ata_port_for_each_link(link, ap) { + if (!(sntf & (1 << link->pmp))) + continue; + + if ((link->device->class == ATA_DEV_ATAPI) && + (link->device->flags & ATA_DFLAG_AN)) + ata_scsi_media_change_notify(link->device); + } + + /* If PMP is reporting that PHY status of some + * downstream ports has changed, schedule EH. + */ + if (sntf & (1 << SATA_PMP_CTRL_PORT)) { + ata_port_schedule_eh(ap); + return 1; + } + + return 0; + } +} + +/** + * ata_eh_freeze_port - EH helper to freeze port + * @ap: ATA port to freeze + * + * Freeze @ap. + * + * LOCKING: + * None. + */ +void ata_eh_freeze_port(struct ata_port *ap) +{ + unsigned long flags; + + if (!ap->ops->error_handler) + return; + + spin_lock_irqsave(ap->lock, flags); + __ata_port_freeze(ap); + spin_unlock_irqrestore(ap->lock, flags); +} + +/** + * ata_port_thaw_port - EH helper to thaw port + * @ap: ATA port to thaw + * + * Thaw frozen port @ap. + * + * LOCKING: + * None. + */ +void ata_eh_thaw_port(struct ata_port *ap) +{ + unsigned long flags; + + if (!ap->ops->error_handler) + return; + + spin_lock_irqsave(ap->lock, flags); + + ap->pflags &= ~ATA_PFLAG_FROZEN; + + if (ap->ops->thaw) + ap->ops->thaw(ap); + + spin_unlock_irqrestore(ap->lock, flags); + + DPRINTK("ata%u port thawed\n", ap->print_id); +} + +static void ata_eh_scsidone(struct scsi_cmnd *scmd) +{ + /* nada */ +} + +static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct scsi_cmnd *scmd = qc->scsicmd; + unsigned long flags; + + spin_lock_irqsave(ap->lock, flags); + qc->scsidone = ata_eh_scsidone; + __ata_qc_complete(qc); + WARN_ON(ata_tag_valid(qc->tag)); + spin_unlock_irqrestore(ap->lock, flags); + + scsi_eh_finish_cmd(scmd, &ap->eh_done_q); +} + +/** + * ata_eh_qc_complete - Complete an active ATA command from EH + * @qc: Command to complete + * + * Indicate to the mid and upper layers that an ATA command has + * completed. To be used from EH. + */ +void ata_eh_qc_complete(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + scmd->retries = scmd->allowed; + __ata_eh_qc_complete(qc); +} + +/** + * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH + * @qc: Command to retry + * + * Indicate to the mid and upper layers that an ATA command + * should be retried. To be used from EH. + * + * SCSI midlayer limits the number of retries to scmd->allowed. + * scmd->retries is decremented for commands which get retried + * due to unrelated failures (qc->err_mask is zero). + */ +void ata_eh_qc_retry(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + if (!qc->err_mask && scmd->retries) + scmd->retries--; + __ata_eh_qc_complete(qc); +} + +/** + * ata_eh_detach_dev - detach ATA device + * @dev: ATA device to detach + * + * Detach @dev. + * + * LOCKING: + * None. + */ +void ata_eh_detach_dev(struct ata_device *dev) +{ + struct ata_link *link = dev->link; + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + unsigned long flags; + + ata_dev_disable(dev); + + spin_lock_irqsave(ap->lock, flags); + + dev->flags &= ~ATA_DFLAG_DETACH; + + if (ata_scsi_offline_dev(dev)) { + dev->flags |= ATA_DFLAG_DETACHED; + ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; + } + + /* clear per-dev EH info */ + ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK); + ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK); + ehc->saved_xfer_mode[dev->devno] = 0; + ehc->saved_ncq_enabled &= ~(1 << dev->devno); + + spin_unlock_irqrestore(ap->lock, flags); +} + +/** + * ata_eh_about_to_do - about to perform eh_action + * @link: target ATA link + * @dev: target ATA dev for per-dev action (can be NULL) + * @action: action about to be performed + * + * Called just before performing EH actions to clear related bits + * in @link->eh_info such that eh actions are not unnecessarily + * repeated. + * + * LOCKING: + * None. + */ +void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev, + unsigned int action) +{ + struct ata_port *ap = link->ap; + struct ata_eh_info *ehi = &link->eh_info; + struct ata_eh_context *ehc = &link->eh_context; + unsigned long flags; + + spin_lock_irqsave(ap->lock, flags); + + ata_eh_clear_action(link, dev, ehi, action); + + /* About to take EH action, set RECOVERED. Ignore actions on + * slave links as master will do them again. + */ + if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link) + ap->pflags |= ATA_PFLAG_RECOVERED; + + spin_unlock_irqrestore(ap->lock, flags); +} + +/** + * ata_eh_done - EH action complete +* @ap: target ATA port + * @dev: target ATA dev for per-dev action (can be NULL) + * @action: action just completed + * + * Called right after performing EH actions to clear related bits + * in @link->eh_context. + * + * LOCKING: + * None. + */ +void ata_eh_done(struct ata_link *link, struct ata_device *dev, + unsigned int action) +{ + struct ata_eh_context *ehc = &link->eh_context; + + ata_eh_clear_action(link, dev, &ehc->i, action); +} + +/** + * ata_err_string - convert err_mask to descriptive string + * @err_mask: error mask to convert to string + * + * Convert @err_mask to descriptive string. Errors are + * prioritized according to severity and only the most severe + * error is reported. + * + * LOCKING: + * None. + * + * RETURNS: + * Descriptive string for @err_mask + */ +static const char *ata_err_string(unsigned int err_mask) +{ + if (err_mask & AC_ERR_HOST_BUS) + return "host bus error"; + if (err_mask & AC_ERR_ATA_BUS) + return "ATA bus error"; + if (err_mask & AC_ERR_TIMEOUT) + return "timeout"; + if (err_mask & AC_ERR_HSM) + return "HSM violation"; + if (err_mask & AC_ERR_SYSTEM) + return "internal error"; + if (err_mask & AC_ERR_MEDIA) + return "media error"; + if (err_mask & AC_ERR_INVALID) + return "invalid argument"; + if (err_mask & AC_ERR_DEV) + return "device error"; + return "unknown error"; +} + +/** + * ata_read_log_page - read a specific log page + * @dev: target device + * @page: page to read + * @buf: buffer to store read page + * @sectors: number of sectors to read + * + * Read log page using READ_LOG_EXT command. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, AC_ERR_* mask otherwise. + */ +static unsigned int ata_read_log_page(struct ata_device *dev, + u8 page, void *buf, unsigned int sectors) +{ + struct ata_taskfile tf; + unsigned int err_mask; + + DPRINTK("read log page - page %d\n", page); + + ata_tf_init(dev, &tf); + tf.command = ATA_CMD_READ_LOG_EXT; + tf.lbal = page; + tf.nsect = sectors; + tf.hob_nsect = sectors >> 8; + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; + tf.protocol = ATA_PROT_PIO; + + err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, + buf, sectors * ATA_SECT_SIZE, 0); + + DPRINTK("EXIT, err_mask=%x\n", err_mask); + return err_mask; +} + +/** + * ata_eh_read_log_10h - Read log page 10h for NCQ error details + * @dev: Device to read log page 10h from + * @tag: Resulting tag of the failed command + * @tf: Resulting taskfile registers of the failed command + * + * Read log page 10h to obtain NCQ error details and clear error + * condition. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, -errno otherwise. + */ +static int ata_eh_read_log_10h(struct ata_device *dev, + int *tag, struct ata_taskfile *tf) +{ + u8 *buf = dev->link->ap->sector_buf; + unsigned int err_mask; + u8 csum; + int i; + + err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); + if (err_mask) + return -EIO; + + csum = 0; + for (i = 0; i < ATA_SECT_SIZE; i++) + csum += buf[i]; + if (csum) + ata_dev_printk(dev, KERN_WARNING, + "invalid checksum 0x%x on log page 10h\n", csum); + + if (buf[0] & 0x80) + return -ENOENT; + + *tag = buf[0] & 0x1f; + + tf->command = buf[2]; + tf->feature = buf[3]; + tf->lbal = buf[4]; + tf->lbam = buf[5]; + tf->lbah = buf[6]; + tf->device = buf[7]; + tf->hob_lbal = buf[8]; + tf->hob_lbam = buf[9]; + tf->hob_lbah = buf[10]; + tf->nsect = buf[12]; + tf->hob_nsect = buf[13]; + + return 0; +} + +/** + * atapi_eh_tur - perform ATAPI TEST_UNIT_READY + * @dev: target ATAPI device + * @r_sense_key: out parameter for sense_key + * + * Perform ATAPI TEST_UNIT_READY. + * + * LOCKING: + * EH context (may sleep). + * + * RETURNS: + * 0 on success, AC_ERR_* mask on failure. + */ +static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key) +{ + u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 }; + struct ata_taskfile tf; + unsigned int err_mask; + + ata_tf_init(dev, &tf); + + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + tf.command = ATA_CMD_PACKET; + tf.protocol = ATAPI_PROT_NODATA; + + err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0); + if (err_mask == AC_ERR_DEV) + *r_sense_key = tf.feature >> 4; + return err_mask; +} + +/** + * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE + * @dev: device to perform REQUEST_SENSE to + * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) + * @dfl_sense_key: default sense key to use + * + * Perform ATAPI REQUEST_SENSE after the device reported CHECK + * SENSE. This function is EH helper. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, AC_ERR_* mask on failure + */ +static unsigned int atapi_eh_request_sense(struct ata_device *dev, + u8 *sense_buf, u8 dfl_sense_key) +{ + u8 cdb[ATAPI_CDB_LEN] = + { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 }; + struct ata_port *ap = dev->link->ap; + struct ata_taskfile tf; + + DPRINTK("ATAPI request sense\n"); + + /* FIXME: is this needed? */ + memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); + + /* initialize sense_buf with the error register, + * for the case where they are -not- overwritten + */ + sense_buf[0] = 0x70; + sense_buf[2] = dfl_sense_key; + + /* some devices time out if garbage left in tf */ + ata_tf_init(dev, &tf); + + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + tf.command = ATA_CMD_PACKET; + + /* is it pointless to prefer PIO for "safety reasons"? */ + if (ap->flags & ATA_FLAG_PIO_DMA) { + tf.protocol = ATAPI_PROT_DMA; + tf.feature |= ATAPI_PKT_DMA; + } else { + tf.protocol = ATAPI_PROT_PIO; + tf.lbam = SCSI_SENSE_BUFFERSIZE; + tf.lbah = 0; + } + + return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, + sense_buf, SCSI_SENSE_BUFFERSIZE, 0); +} + +/** + * ata_eh_analyze_serror - analyze SError for a failed port + * @link: ATA link to analyze SError for + * + * Analyze SError if available and further determine cause of + * failure. + * + * LOCKING: + * None. + */ +static void ata_eh_analyze_serror(struct ata_link *link) +{ + struct ata_eh_context *ehc = &link->eh_context; + u32 serror = ehc->i.serror; + unsigned int err_mask = 0, action = 0; + u32 hotplug_mask; + + if (serror & (SERR_PERSISTENT | SERR_DATA)) { + err_mask |= AC_ERR_ATA_BUS; + action |= ATA_EH_RESET; + } + if (serror & SERR_PROTOCOL) { + err_mask |= AC_ERR_HSM; + action |= ATA_EH_RESET; + } + if (serror & SERR_INTERNAL) { + err_mask |= AC_ERR_SYSTEM; + action |= ATA_EH_RESET; + } + + /* Determine whether a hotplug event has occurred. Both + * SError.N/X are considered hotplug events for enabled or + * host links. For disabled PMP links, only N bit is + * considered as X bit is left at 1 for link plugging. + */ + hotplug_mask = 0; + + if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link)) + hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG; + else + hotplug_mask = SERR_PHYRDY_CHG; + + if (serror & hotplug_mask) + ata_ehi_hotplugged(&ehc->i); + + ehc->i.err_mask |= err_mask; + ehc->i.action |= action; +} + +/** + * ata_eh_analyze_ncq_error - analyze NCQ error + * @link: ATA link to analyze NCQ error for + * + * Read log page 10h, determine the offending qc and acquire + * error status TF. For NCQ device errors, all LLDDs have to do + * is setting AC_ERR_DEV in ehi->err_mask. This function takes + * care of the rest. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_eh_analyze_ncq_error(struct ata_link *link) +{ + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + struct ata_device *dev = link->device; + struct ata_queued_cmd *qc; + struct ata_taskfile tf; + int tag, rc; + + /* if frozen, we can't do much */ + if (ap->pflags & ATA_PFLAG_FROZEN) + return; + + /* is it NCQ device error? */ + if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) + return; + + /* has LLDD analyzed already? */ + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + qc = __ata_qc_from_tag(ap, tag); + + if (!(qc->flags & ATA_QCFLAG_FAILED)) + continue; + + if (qc->err_mask) + return; + } + + /* okay, this error is ours */ + rc = ata_eh_read_log_10h(dev, &tag, &tf); + if (rc) { + ata_link_printk(link, KERN_ERR, "failed to read log page 10h " + "(errno=%d)\n", rc); + return; + } + + if (!(link->sactive & (1 << tag))) { + ata_link_printk(link, KERN_ERR, "log page 10h reported " + "inactive tag %d\n", tag); + return; + } + + /* we've got the perpetrator, condemn it */ + qc = __ata_qc_from_tag(ap, tag); + memcpy(&qc->result_tf, &tf, sizeof(tf)); + qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48; + qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; + ehc->i.err_mask &= ~AC_ERR_DEV; +} + +/** + * ata_eh_analyze_tf - analyze taskfile of a failed qc + * @qc: qc to analyze + * @tf: Taskfile registers to analyze + * + * Analyze taskfile of @qc and further determine cause of + * failure. This function also requests ATAPI sense data if + * avaliable. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * Determined recovery action + */ +static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, + const struct ata_taskfile *tf) +{ + unsigned int tmp, action = 0; + u8 stat = tf->command, err = tf->feature; + + if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { + qc->err_mask |= AC_ERR_HSM; + return ATA_EH_RESET; + } + + if (stat & (ATA_ERR | ATA_DF)) + qc->err_mask |= AC_ERR_DEV; + else + return 0; + + switch (qc->dev->class) { + case ATA_DEV_ATA: + if (err & ATA_ICRC) + qc->err_mask |= AC_ERR_ATA_BUS; + if (err & ATA_UNC) + qc->err_mask |= AC_ERR_MEDIA; + if (err & ATA_IDNF) + qc->err_mask |= AC_ERR_INVALID; + break; + + case ATA_DEV_ATAPI: + if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { + tmp = atapi_eh_request_sense(qc->dev, + qc->scsicmd->sense_buffer, + qc->result_tf.feature >> 4); + if (!tmp) { + /* ATA_QCFLAG_SENSE_VALID is used to + * tell atapi_qc_complete() that sense + * data is already valid. + * + * TODO: interpret sense data and set + * appropriate err_mask. + */ + qc->flags |= ATA_QCFLAG_SENSE_VALID; + } else + qc->err_mask |= tmp; + } + } + + if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) + action |= ATA_EH_RESET; + + return action; +} + +static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask, + int *xfer_ok) +{ + int base = 0; + + if (!(eflags & ATA_EFLAG_DUBIOUS_XFER)) + *xfer_ok = 1; + + if (!*xfer_ok) + base = ATA_ECAT_DUBIOUS_NONE; + + if (err_mask & AC_ERR_ATA_BUS) + return base + ATA_ECAT_ATA_BUS; + + if (err_mask & AC_ERR_TIMEOUT) + return base + ATA_ECAT_TOUT_HSM; + + if (eflags & ATA_EFLAG_IS_IO) { + if (err_mask & AC_ERR_HSM) + return base + ATA_ECAT_TOUT_HSM; + if ((err_mask & + (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) + return base + ATA_ECAT_UNK_DEV; + } + + return 0; +} + +struct speed_down_verdict_arg { + u64 since; + int xfer_ok; + int nr_errors[ATA_ECAT_NR]; +}; + +static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) +{ + struct speed_down_verdict_arg *arg = void_arg; + int cat; + + if (ent->timestamp < arg->since) + return -1; + + cat = ata_eh_categorize_error(ent->eflags, ent->err_mask, + &arg->xfer_ok); + arg->nr_errors[cat]++; + + return 0; +} + +/** + * ata_eh_speed_down_verdict - Determine speed down verdict + * @dev: Device of interest + * + * This function examines error ring of @dev and determines + * whether NCQ needs to be turned off, transfer speed should be + * stepped down, or falling back to PIO is necessary. + * + * ECAT_ATA_BUS : ATA_BUS error for any command + * + * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for + * IO commands + * + * ECAT_UNK_DEV : Unknown DEV error for IO commands + * + * ECAT_DUBIOUS_* : Identical to above three but occurred while + * data transfer hasn't been verified. + * + * Verdicts are + * + * NCQ_OFF : Turn off NCQ. + * + * SPEED_DOWN : Speed down transfer speed but don't fall back + * to PIO. + * + * FALLBACK_TO_PIO : Fall back to PIO. + * + * Even if multiple verdicts are returned, only one action is + * taken per error. An action triggered by non-DUBIOUS errors + * clears ering, while one triggered by DUBIOUS_* errors doesn't. + * This is to expedite speed down decisions right after device is + * initially configured. + * + * The followings are speed down rules. #1 and #2 deal with + * DUBIOUS errors. + * + * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors + * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO. + * + * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors + * occurred during last 5 mins, NCQ_OFF. + * + * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors + * ocurred during last 5 mins, FALLBACK_TO_PIO + * + * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred + * during last 10 mins, NCQ_OFF. + * + * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6 + * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN. + * + * LOCKING: + * Inherited from caller. + * + * RETURNS: + * OR of ATA_EH_SPDN_* flags. + */ +static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) +{ + const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; + u64 j64 = get_jiffies_64(); + struct speed_down_verdict_arg arg; + unsigned int verdict = 0; + + /* scan past 5 mins of error history */ + memset(&arg, 0, sizeof(arg)); + arg.since = j64 - min(j64, j5mins); + ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); + + if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] + + arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1) + verdict |= ATA_EH_SPDN_SPEED_DOWN | + ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS; + + if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] + + arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1) + verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS; + + if (arg.nr_errors[ATA_ECAT_ATA_BUS] + + arg.nr_errors[ATA_ECAT_TOUT_HSM] + + arg.nr_errors[ATA_ECAT_UNK_DEV] > 6) + verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; + + /* scan past 10 mins of error history */ + memset(&arg, 0, sizeof(arg)); + arg.since = j64 - min(j64, j10mins); + ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); + + if (arg.nr_errors[ATA_ECAT_TOUT_HSM] + + arg.nr_errors[ATA_ECAT_UNK_DEV] > 3) + verdict |= ATA_EH_SPDN_NCQ_OFF; + + if (arg.nr_errors[ATA_ECAT_ATA_BUS] + + arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 || + arg.nr_errors[ATA_ECAT_UNK_DEV] > 6) + verdict |= ATA_EH_SPDN_SPEED_DOWN; + + return verdict; +} + +/** + * ata_eh_speed_down - record error and speed down if necessary + * @dev: Failed device + * @eflags: mask of ATA_EFLAG_* flags + * @err_mask: err_mask of the error + * + * Record error and examine error history to determine whether + * adjusting transmission speed is necessary. It also sets + * transmission limits appropriately if such adjustment is + * necessary. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * Determined recovery action. + */ +static unsigned int ata_eh_speed_down(struct ata_device *dev, + unsigned int eflags, unsigned int err_mask) +{ + struct ata_link *link = ata_dev_phys_link(dev); + int xfer_ok = 0; + unsigned int verdict; + unsigned int action = 0; + + /* don't bother if Cat-0 error */ + if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0) + return 0; + + /* record error and determine whether speed down is necessary */ + ata_ering_record(&dev->ering, eflags, err_mask); + verdict = ata_eh_speed_down_verdict(dev); + + /* turn off NCQ? */ + if ((verdict & ATA_EH_SPDN_NCQ_OFF) && + (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | + ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { + dev->flags |= ATA_DFLAG_NCQ_OFF; + ata_dev_printk(dev, KERN_WARNING, + "NCQ disabled due to excessive errors\n"); + goto done; + } + + /* speed down? */ + if (verdict & ATA_EH_SPDN_SPEED_DOWN) { + /* speed down SATA link speed if possible */ + if (sata_down_spd_limit(link) == 0) { + action |= ATA_EH_RESET; + goto done; + } + + /* lower transfer mode */ + if (dev->spdn_cnt < 2) { + static const int dma_dnxfer_sel[] = + { ATA_DNXFER_DMA, ATA_DNXFER_40C }; + static const int pio_dnxfer_sel[] = + { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; + int sel; + + if (dev->xfer_shift != ATA_SHIFT_PIO) + sel = dma_dnxfer_sel[dev->spdn_cnt]; + else + sel = pio_dnxfer_sel[dev->spdn_cnt]; + + dev->spdn_cnt++; + + if (ata_down_xfermask_limit(dev, sel) == 0) { + action |= ATA_EH_RESET; + goto done; + } + } + } + + /* Fall back to PIO? Slowing down to PIO is meaningless for + * SATA ATA devices. Consider it only for PATA and SATAPI. + */ + if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && + (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) && + (dev->xfer_shift != ATA_SHIFT_PIO)) { + if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { + dev->spdn_cnt = 0; + action |= ATA_EH_RESET; + goto done; + } + } + + return 0; + done: + /* device has been slowed down, blow error history */ + if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS)) + ata_ering_clear(&dev->ering); + return action; +} + +/** + * ata_eh_link_autopsy - analyze error and determine recovery action + * @link: host link to perform autopsy on + * + * Analyze why @link failed and determine which recovery actions + * are needed. This function also sets more detailed AC_ERR_* + * values and fills sense data for ATAPI CHECK SENSE. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +static void ata_eh_link_autopsy(struct ata_link *link) +{ + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + struct ata_device *dev; + unsigned int all_err_mask = 0, eflags = 0; + int tag; + u32 serror; + int rc; + + DPRINTK("ENTER\n"); + + if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) + return; + + /* obtain and analyze SError */ + rc = sata_scr_read(link, SCR_ERROR, &serror); + if (rc == 0) { + ehc->i.serror |= serror; + ata_eh_analyze_serror(link); + } else if (rc != -EOPNOTSUPP) { + /* SError read failed, force reset and probing */ + ehc->i.probe_mask |= ATA_ALL_DEVICES; + ehc->i.action |= ATA_EH_RESET; + ehc->i.err_mask |= AC_ERR_OTHER; + } + + /* analyze NCQ failure */ + ata_eh_analyze_ncq_error(link); + + /* any real error trumps AC_ERR_OTHER */ + if (ehc->i.err_mask & ~AC_ERR_OTHER) + ehc->i.err_mask &= ~AC_ERR_OTHER; + + all_err_mask |= ehc->i.err_mask; + + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); + + if (!(qc->flags & ATA_QCFLAG_FAILED) || + ata_dev_phys_link(qc->dev) != link) + continue; + + /* inherit upper level err_mask */ + qc->err_mask |= ehc->i.err_mask; + + /* analyze TF */ + ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); + + /* DEV errors are probably spurious in case of ATA_BUS error */ + if (qc->err_mask & AC_ERR_ATA_BUS) + qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | + AC_ERR_INVALID); + + /* any real error trumps unknown error */ + if (qc->err_mask & ~AC_ERR_OTHER) + qc->err_mask &= ~AC_ERR_OTHER; + + /* SENSE_VALID trumps dev/unknown error and revalidation */ + if (qc->flags & ATA_QCFLAG_SENSE_VALID) + qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); + + /* determine whether the command is worth retrying */ + if (!(qc->err_mask & AC_ERR_INVALID) && + ((qc->flags & ATA_QCFLAG_IO) || qc->err_mask != AC_ERR_DEV)) + qc->flags |= ATA_QCFLAG_RETRY; + + /* accumulate error info */ + ehc->i.dev = qc->dev; + all_err_mask |= qc->err_mask; + if (qc->flags & ATA_QCFLAG_IO) + eflags |= ATA_EFLAG_IS_IO; + } + + /* enforce default EH actions */ + if (ap->pflags & ATA_PFLAG_FROZEN || + all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) + ehc->i.action |= ATA_EH_RESET; + else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) || + (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV))) + ehc->i.action |= ATA_EH_REVALIDATE; + + /* If we have offending qcs and the associated failed device, + * perform per-dev EH action only on the offending device. + */ + if (ehc->i.dev) { + ehc->i.dev_action[ehc->i.dev->devno] |= + ehc->i.action & ATA_EH_PERDEV_MASK; + ehc->i.action &= ~ATA_EH_PERDEV_MASK; + } + + /* propagate timeout to host link */ + if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link)) + ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT; + + /* record error and consider speeding down */ + dev = ehc->i.dev; + if (!dev && ((ata_link_max_devices(link) == 1 && + ata_dev_enabled(link->device)))) + dev = link->device; + + if (dev) { + if (dev->flags & ATA_DFLAG_DUBIOUS_XFER) + eflags |= ATA_EFLAG_DUBIOUS_XFER; + ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask); + } + + DPRINTK("EXIT\n"); +} + +/** + * ata_eh_autopsy - analyze error and determine recovery action + * @ap: host port to perform autopsy on + * + * Analyze all links of @ap and determine why they failed and + * which recovery actions are needed. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_eh_autopsy(struct ata_port *ap) +{ + struct ata_link *link; + + ata_port_for_each_link(link, ap) + ata_eh_link_autopsy(link); + + /* Handle the frigging slave link. Autopsy is done similarly + * but actions and flags are transferred over to the master + * link and handled from there. + */ + if (ap->slave_link) { + struct ata_eh_context *mehc = &ap->link.eh_context; + struct ata_eh_context *sehc = &ap->slave_link->eh_context; + + /* transfer control flags from master to slave */ + sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK; + + /* perform autopsy on the slave link */ + ata_eh_link_autopsy(ap->slave_link); + + /* transfer actions from slave to master and clear slave */ + ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS); + mehc->i.action |= sehc->i.action; + mehc->i.dev_action[1] |= sehc->i.dev_action[1]; + mehc->i.flags |= sehc->i.flags; + ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS); + } + + /* Autopsy of fanout ports can affect host link autopsy. + * Perform host link autopsy last. + */ + if (sata_pmp_attached(ap)) + ata_eh_link_autopsy(&ap->link); +} + +/** + * ata_eh_link_report - report error handling to user + * @link: ATA link EH is going on + * + * Report EH to user. + * + * LOCKING: + * None. + */ +static void ata_eh_link_report(struct ata_link *link) +{ + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + const char *frozen, *desc; + char tries_buf[6]; + int tag, nr_failed = 0; + + if (ehc->i.flags & ATA_EHI_QUIET) + return; + + desc = NULL; + if (ehc->i.desc[0] != '\0') + desc = ehc->i.desc; + + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); + + if (!(qc->flags & ATA_QCFLAG_FAILED) || + ata_dev_phys_link(qc->dev) != link || + ((qc->flags & ATA_QCFLAG_QUIET) && + qc->err_mask == AC_ERR_DEV)) + continue; + if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) + continue; + + nr_failed++; + } + + if (!nr_failed && !ehc->i.err_mask) + return; + + frozen = ""; + if (ap->pflags & ATA_PFLAG_FROZEN) + frozen = " frozen"; + + memset(tries_buf, 0, sizeof(tries_buf)); + if (ap->eh_tries < ATA_EH_MAX_TRIES) + snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d", + ap->eh_tries); + + if (ehc->i.dev) { + ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " + "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", + ehc->i.err_mask, link->sactive, ehc->i.serror, + ehc->i.action, frozen, tries_buf); + if (desc) + ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); + } else { + ata_link_printk(link, KERN_ERR, "exception Emask 0x%x " + "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", + ehc->i.err_mask, link->sactive, ehc->i.serror, + ehc->i.action, frozen, tries_buf); + if (desc) + ata_link_printk(link, KERN_ERR, "%s\n", desc); + } + + if (ehc->i.serror) + ata_link_printk(link, KERN_ERR, + "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n", + ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "", + ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "", + ehc->i.serror & SERR_DATA ? "UnrecovData " : "", + ehc->i.serror & SERR_PERSISTENT ? "Persist " : "", + ehc->i.serror & SERR_PROTOCOL ? "Proto " : "", + ehc->i.serror & SERR_INTERNAL ? "HostInt " : "", + ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "", + ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "", + ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "", + ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "", + ehc->i.serror & SERR_DISPARITY ? "Dispar " : "", + ehc->i.serror & SERR_CRC ? "BadCRC " : "", + ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "", + ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "", + ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "", + ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "", + ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : ""); + + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); + struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; + const u8 *cdb = qc->cdb; + char data_buf[20] = ""; + char cdb_buf[70] = ""; + + if (!(qc->flags & ATA_QCFLAG_FAILED) || + ata_dev_phys_link(qc->dev) != link || !qc->err_mask) + continue; + + if (qc->dma_dir != DMA_NONE) { + static const char *dma_str[] = { + [DMA_BIDIRECTIONAL] = "bidi", + [DMA_TO_DEVICE] = "out", + [DMA_FROM_DEVICE] = "in", + }; + static const char *prot_str[] = { + [ATA_PROT_PIO] = "pio", + [ATA_PROT_DMA] = "dma", + [ATA_PROT_NCQ] = "ncq", + [ATAPI_PROT_PIO] = "pio", + [ATAPI_PROT_DMA] = "dma", + }; + + snprintf(data_buf, sizeof(data_buf), " %s %u %s", + prot_str[qc->tf.protocol], qc->nbytes, + dma_str[qc->dma_dir]); + } + + if (ata_is_atapi(qc->tf.protocol)) + snprintf(cdb_buf, sizeof(cdb_buf), + "cdb %02x %02x %02x %02x %02x %02x %02x %02x " + "%02x %02x %02x %02x %02x %02x %02x %02x\n ", + cdb[0], cdb[1], cdb[2], cdb[3], + cdb[4], cdb[5], cdb[6], cdb[7], + cdb[8], cdb[9], cdb[10], cdb[11], + cdb[12], cdb[13], cdb[14], cdb[15]); + + ata_dev_printk(qc->dev, KERN_ERR, + "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " + "tag %d%s\n %s" + "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " + "Emask 0x%x (%s)%s\n", + cmd->command, cmd->feature, cmd->nsect, + cmd->lbal, cmd->lbam, cmd->lbah, + cmd->hob_feature, cmd->hob_nsect, + cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, + cmd->device, qc->tag, data_buf, cdb_buf, + res->command, res->feature, res->nsect, + res->lbal, res->lbam, res->lbah, + res->hob_feature, res->hob_nsect, + res->hob_lbal, res->hob_lbam, res->hob_lbah, + res->device, qc->err_mask, ata_err_string(qc->err_mask), + qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); + + if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | + ATA_ERR)) { + if (res->command & ATA_BUSY) + ata_dev_printk(qc->dev, KERN_ERR, + "status: { Busy }\n"); + else + ata_dev_printk(qc->dev, KERN_ERR, + "status: { %s%s%s%s}\n", + res->command & ATA_DRDY ? "DRDY " : "", + res->command & ATA_DF ? "DF " : "", + res->command & ATA_DRQ ? "DRQ " : "", + res->command & ATA_ERR ? "ERR " : ""); + } + + if (cmd->command != ATA_CMD_PACKET && + (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF | + ATA_ABORTED))) + ata_dev_printk(qc->dev, KERN_ERR, + "error: { %s%s%s%s}\n", + res->feature & ATA_ICRC ? "ICRC " : "", + res->feature & ATA_UNC ? "UNC " : "", + res->feature & ATA_IDNF ? "IDNF " : "", + res->feature & ATA_ABORTED ? "ABRT " : ""); + } +} + +/** + * ata_eh_report - report error handling to user + * @ap: ATA port to report EH about + * + * Report EH to user. + * + * LOCKING: + * None. + */ +void ata_eh_report(struct ata_port *ap) +{ + struct ata_link *link; + + __ata_port_for_each_link(link, ap) + 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_link_for_each_dev(dev, link) + classes[dev->devno] = ATA_DEV_UNKNOWN; + + return reset(link, classes, deadline); +} + +static int ata_eh_followup_srst_needed(struct ata_link *link, + int rc, const unsigned int *classes) +{ + if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link)) + return 0; + if (rc == -EAGAIN) + return 1; + if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) + return 1; + return 0; +} + +int ata_eh_reset(struct ata_link *link, int classify, + ata_prereset_fn_t prereset, ata_reset_fn_t softreset, + ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) +{ + struct ata_port *ap = link->ap; + struct ata_link *slave = ap->slave_link; + struct ata_eh_context *ehc = &link->eh_context; + struct ata_eh_context *sehc = &slave->eh_context; + unsigned int *classes = ehc->classes; + unsigned int lflags = link->flags; + int verbose = !(ehc->i.flags & ATA_EHI_QUIET); + int max_tries = 0, try = 0; + struct ata_link *failed_link; + struct ata_device *dev; + unsigned long deadline, now; + ata_reset_fn_t reset; + unsigned long flags; + u32 sstatus; + int nr_unknown, rc; + + /* + * Prepare to reset + */ + while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX) + max_tries++; + if (link->flags & ATA_LFLAG_NO_HRST) + hardreset = NULL; + if (link->flags & ATA_LFLAG_NO_SRST) + softreset = NULL; + + /* make sure each reset attemp is at least COOL_DOWN apart */ + if (ehc->i.flags & ATA_EHI_DID_RESET) { + now = jiffies; + WARN_ON(time_after(ehc->last_reset, now)); + deadline = ata_deadline(ehc->last_reset, + ATA_EH_RESET_COOL_DOWN); + if (time_before(now, deadline)) + schedule_timeout_uninterruptible(deadline - now); + } + + spin_lock_irqsave(ap->lock, flags); + ap->pflags |= ATA_PFLAG_RESETTING; + spin_unlock_irqrestore(ap->lock, flags); + + ata_eh_about_to_do(link, NULL, ATA_EH_RESET); + + ata_link_for_each_dev(dev, link) { + /* If we issue an SRST then an ATA drive (not ATAPI) + * may change configuration and be in PIO0 timing. If + * we do a hard reset (or are coming from power on) + * this is true for ATA or ATAPI. Until we've set a + * suitable controller mode we should not touch the + * bus as we may be talking too fast. + */ + dev->pio_mode = XFER_PIO_0; + + /* If the controller has a pio mode setup function + * then use it to set the chipset to rights. Don't + * touch the DMA setup as that will be dealt with when + * configuring devices. + */ + if (ap->ops->set_piomode) + ap->ops->set_piomode(ap, dev); + } + + /* prefer hardreset */ + reset = NULL; + ehc->i.action &= ~ATA_EH_RESET; + if (hardreset) { + reset = hardreset; + ehc->i.action |= ATA_EH_HARDRESET; + } else if (softreset) { + reset = softreset; + ehc->i.action |= ATA_EH_SOFTRESET; + } + + if (prereset) { + unsigned long deadline = ata_deadline(jiffies, + ATA_EH_PRERESET_TIMEOUT); + + if (slave) { + sehc->i.action &= ~ATA_EH_RESET; + sehc->i.action |= ehc->i.action; + } + + rc = prereset(link, deadline); + + /* If present, do prereset on slave link too. Reset + * is skipped iff both master and slave links report + * -ENOENT or clear ATA_EH_RESET. + */ + if (slave && (rc == 0 || rc == -ENOENT)) { + int tmp; + + tmp = prereset(slave, deadline); + if (tmp != -ENOENT) + rc = tmp; + + ehc->i.action |= sehc->i.action; + } + + if (rc) { + if (rc == -ENOENT) { + ata_link_printk(link, KERN_DEBUG, + "port disabled. ignoring.\n"); + ehc->i.action &= ~ATA_EH_RESET; + + ata_link_for_each_dev(dev, link) + classes[dev->devno] = ATA_DEV_NONE; + + rc = 0; + } else + ata_link_printk(link, KERN_ERR, + "prereset failed (errno=%d)\n", rc); + goto out; + } + + /* prereset() might have cleared ATA_EH_RESET. If so, + * bang classes, thaw and return. + */ + if (reset && !(ehc->i.action & ATA_EH_RESET)) { + ata_link_for_each_dev(dev, link) + 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_printk(link, KERN_INFO, "%s resetting link\n", + reset == softreset ? "soft" : "hard"); + + /* mark that this EH session started with reset */ + ehc->last_reset = jiffies; + if (reset == hardreset) + ehc->i.flags |= ATA_EHI_DID_HARDRESET; + else + ehc->i.flags |= ATA_EHI_DID_SOFTRESET; + + rc = ata_do_reset(link, reset, classes, deadline, true); + if (rc && rc != -EAGAIN) { + failed_link = link; + goto fail; + } + + /* hardreset slave link if existent */ + if (slave && reset == hardreset) { + int tmp; + + if (verbose) + ata_link_printk(slave, KERN_INFO, + "hard resetting link\n"); + + ata_eh_about_to_do(slave, NULL, ATA_EH_RESET); + tmp = ata_do_reset(slave, reset, classes, deadline, + false); + switch (tmp) { + case -EAGAIN: + rc = -EAGAIN; + case 0: + break; + default: + failed_link = slave; + rc = tmp; + goto fail; + } + } + + /* perform follow-up SRST if necessary */ + if (reset == hardreset && + ata_eh_followup_srst_needed(link, rc, classes)) { + reset = softreset; + + if (!reset) { + ata_link_printk(link, KERN_ERR, + "follow-up softreset required " + "but no softreset avaliable\n"); + failed_link = link; + rc = -EINVAL; + goto fail; + } + + ata_eh_about_to_do(link, NULL, ATA_EH_RESET); + rc = ata_do_reset(link, reset, classes, deadline, true); + } + } else { + if (verbose) + ata_link_printk(link, KERN_INFO, "no reset method " + "available, skipping reset\n"); + if (!(lflags & ATA_LFLAG_ASSUME_CLASS)) + lflags |= ATA_LFLAG_ASSUME_ATA; + } + + /* + * Post-reset processing + */ + ata_link_for_each_dev(dev, link) { + /* After the reset, the device state is PIO 0 and the + * controller state is undefined. Reset also wakes up + * drives from sleeping mode. + */ + dev->pio_mode = XFER_PIO_0; + dev->flags &= ~ATA_DFLAG_SLEEPING; + + if (!ata_phys_link_offline(ata_dev_phys_link(dev))) { + /* apply class override */ + if (lflags & ATA_LFLAG_ASSUME_ATA) + classes[dev->devno] = ATA_DEV_ATA; + else if (lflags & ATA_LFLAG_ASSUME_SEMB) + classes[dev->devno] = ATA_DEV_SEMB_UNSUP; + } else + classes[dev->devno] = ATA_DEV_NONE; + } + + /* record current link speed */ + if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0) + link->sata_spd = (sstatus >> 4) & 0xf; + if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0) + slave->sata_spd = (sstatus >> 4) & 0xf; + + /* thaw the port */ + if (ata_is_host_link(link)) + ata_eh_thaw_port(ap); + + /* postreset() should clear hardware SError. Although SError + * is cleared during link resume, clearing SError here is + * necessary as some PHYs raise hotplug events after SRST. + * This introduces race condition where hotplug occurs between + * reset and here. This race is mediated by cross checking + * link onlineness and classification result later. + */ + if (postreset) { + postreset(link, classes); + if (slave) + postreset(slave, classes); + } + + /* clear cached SError */ + spin_lock_irqsave(link->ap->lock, flags); + link->eh_info.serror = 0; + if (slave) + slave->eh_info.serror = 0; + spin_unlock_irqrestore(link->ap->lock, flags); + + /* Make sure onlineness and classification result correspond. + * Hotplug could have happened during reset and some + * controllers fail to wait while a drive is spinning up after + * being hotplugged causing misdetection. By cross checking + * link onlineness and classification result, those conditions + * can be reliably detected and retried. + */ + nr_unknown = 0; + ata_link_for_each_dev(dev, link) { + /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */ + if (classes[dev->devno] == ATA_DEV_UNKNOWN) { + classes[dev->devno] = ATA_DEV_NONE; + if (ata_phys_link_online(ata_dev_phys_link(dev))) + nr_unknown++; + } + } + + if (classify && nr_unknown) { + if (try < max_tries) { + ata_link_printk(link, KERN_WARNING, "link online but " + "device misclassified, retrying\n"); + failed_link = link; + rc = -EAGAIN; + goto fail; + } + ata_link_printk(link, KERN_WARNING, + "link online but device misclassified, " + "device detection might fail\n"); + } + + /* reset successful, schedule revalidation */ + ata_eh_done(link, NULL, ATA_EH_RESET); + if (slave) + ata_eh_done(slave, NULL, ATA_EH_RESET); + ehc->last_reset = jiffies; /* update to completion time */ + ehc->i.action |= ATA_EH_REVALIDATE; + + rc = 0; + out: + /* clear hotplug flag */ + ehc->i.flags &= ~ATA_EHI_HOTPLUGGED; + if (slave) + sehc->i.flags &= ~ATA_EHI_HOTPLUGGED; + + spin_lock_irqsave(ap->lock, flags); + ap->pflags &= ~ATA_PFLAG_RESETTING; + spin_unlock_irqrestore(ap->lock, flags); + + return rc; + + fail: + /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */ + if (!ata_is_host_link(link) && + sata_scr_read(link, SCR_STATUS, &sstatus)) + rc = -ERESTART; + + if (rc == -ERESTART || try >= max_tries) + goto out; + + now = jiffies; + if (time_before(now, deadline)) { + unsigned long delta = deadline - now; + + ata_link_printk(failed_link, KERN_WARNING, + "reset failed (errno=%d), retrying in %u secs\n", + rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000)); + + while (delta) + delta = schedule_timeout_uninterruptible(delta); + } + + if (try == max_tries - 1) { + sata_down_spd_limit(link); + if (slave) + sata_down_spd_limit(slave); + } else if (rc == -EPIPE) + sata_down_spd_limit(failed_link); + + if (hardreset) + reset = hardreset; + goto retry; +} + +static inline void ata_eh_pull_park_action(struct ata_port *ap) +{ + struct ata_link *link; + struct ata_device *dev; + unsigned long flags; + + /* + * This function can be thought of as an extended version of + * ata_eh_about_to_do() specially crafted to accommodate the + * requirements of ATA_EH_PARK handling. Since the EH thread + * does not leave the do {} while () loop in ata_eh_recover as + * long as the timeout for a park request to *one* device on + * the port has not expired, and since we still want to pick + * up park requests to other devices on the same port or + * timeout updates for the same device, we have to pull + * ATA_EH_PARK actions from eh_info into eh_context.i + * ourselves at the beginning of each pass over the loop. + * + * Additionally, all write accesses to &ap->park_req_pending + * through INIT_COMPLETION() (see below) or complete_all() + * (see ata_scsi_park_store()) are protected by the host lock. + * As a result we have that park_req_pending.done is zero on + * exit from this function, i.e. when ATA_EH_PARK actions for + * *all* devices on port ap have been pulled into the + * respective eh_context structs. If, and only if, + * park_req_pending.done is non-zero by the time we reach + * wait_for_completion_timeout(), another ATA_EH_PARK action + * has been scheduled for at least one of the devices on port + * ap and we have to cycle over the do {} while () loop in + * ata_eh_recover() again. + */ + + spin_lock_irqsave(ap->lock, flags); + INIT_COMPLETION(ap->park_req_pending); + ata_port_for_each_link(link, ap) { + ata_link_for_each_dev(dev, link) { + struct ata_eh_info *ehi = &link->eh_info; + + link->eh_context.i.dev_action[dev->devno] |= + ehi->dev_action[dev->devno] & ATA_EH_PARK; + ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK); + } + } + spin_unlock_irqrestore(ap->lock, flags); +} + +static void ata_eh_park_issue_cmd(struct ata_device *dev, int park) +{ + struct ata_eh_context *ehc = &dev->link->eh_context; + struct ata_taskfile tf; + unsigned int err_mask; + + ata_tf_init(dev, &tf); + if (park) { + ehc->unloaded_mask |= 1 << dev->devno; + tf.command = ATA_CMD_IDLEIMMEDIATE; + tf.feature = 0x44; + tf.lbal = 0x4c; + tf.lbam = 0x4e; + tf.lbah = 0x55; + } else { + ehc->unloaded_mask &= ~(1 << dev->devno); + tf.command = ATA_CMD_CHK_POWER; + } + + tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; + tf.protocol |= ATA_PROT_NODATA; + err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); + if (park && (err_mask || tf.lbal != 0xc4)) { + ata_dev_printk(dev, KERN_ERR, "head unload failed!\n"); + ehc->unloaded_mask &= ~(1 << dev->devno); + } +} + +static int ata_eh_revalidate_and_attach(struct ata_link *link, + struct ata_device **r_failed_dev) +{ + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + struct ata_device *dev; + unsigned int new_mask = 0; + unsigned long flags; + int rc = 0; + + DPRINTK("ENTER\n"); + + /* For PATA drive side cable detection to work, IDENTIFY must + * be done backwards such that PDIAG- is released by the slave + * device before the master device is identified. + */ + ata_link_for_each_dev_reverse(dev, link) { + unsigned int action = ata_eh_dev_action(dev); + unsigned int readid_flags = 0; + + if (ehc->i.flags & ATA_EHI_DID_RESET) + readid_flags |= ATA_READID_POSTRESET; + + if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { + WARN_ON(dev->class == ATA_DEV_PMP); + + if (ata_phys_link_offline(ata_dev_phys_link(dev))) { + rc = -EIO; + goto err; + } + + ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE); + rc = ata_dev_revalidate(dev, ehc->classes[dev->devno], + readid_flags); + if (rc) + goto err; + + ata_eh_done(link, dev, ATA_EH_REVALIDATE); + + /* Configuration may have changed, reconfigure + * transfer mode. + */ + ehc->i.flags |= ATA_EHI_SETMODE; + + /* schedule the scsi_rescan_device() here */ + queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); + } else if (dev->class == ATA_DEV_UNKNOWN && + ehc->tries[dev->devno] && + ata_class_enabled(ehc->classes[dev->devno])) { + dev->class = ehc->classes[dev->devno]; + + if (dev->class == ATA_DEV_PMP) + rc = sata_pmp_attach(dev); + else + rc = ata_dev_read_id(dev, &dev->class, + readid_flags, dev->id); + switch (rc) { + case 0: + new_mask |= 1 << dev->devno; + break; + case -ENOENT: + /* IDENTIFY was issued to non-existent + * device. No need to reset. Just + * thaw and kill the device. + */ + ata_eh_thaw_port(ap); + dev->class = ATA_DEV_UNKNOWN; + break; + default: + dev->class = ATA_DEV_UNKNOWN; + goto err; + } + } + } + + /* PDIAG- should have been released, ask cable type if post-reset */ + if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) { + if (ap->ops->cable_detect) + ap->cbl = ap->ops->cable_detect(ap); + ata_force_cbl(ap); + } + + /* Configure new devices forward such that user doesn't see + * device detection messages backwards. + */ + ata_link_for_each_dev(dev, link) { + if (!(new_mask & (1 << dev->devno)) || + dev->class == ATA_DEV_PMP) + continue; + + ehc->i.flags |= ATA_EHI_PRINTINFO; + rc = ata_dev_configure(dev); + ehc->i.flags &= ~ATA_EHI_PRINTINFO; + if (rc) + goto err; + + spin_lock_irqsave(ap->lock, flags); + ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; + spin_unlock_irqrestore(ap->lock, flags); + + /* new device discovered, configure xfermode */ + ehc->i.flags |= ATA_EHI_SETMODE; + } + + return 0; + + err: + *r_failed_dev = dev; + DPRINTK("EXIT rc=%d\n", rc); + return rc; +} + +/** + * ata_set_mode - Program timings and issue SET FEATURES - XFER + * @link: link on which timings will be programmed + * @r_failed_dev: out paramter for failed device + * + * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If + * ata_set_mode() fails, pointer to the failing device is + * returned in @r_failed_dev. + * + * LOCKING: + * PCI/etc. bus probe sem. + * + * RETURNS: + * 0 on success, negative errno otherwise + */ +int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) +{ + struct ata_port *ap = link->ap; + struct ata_device *dev; + int rc; + + /* if data transfer is verified, clear DUBIOUS_XFER on ering top */ + ata_link_for_each_dev(dev, link) { + if (!ata_dev_enabled(dev)) + continue; + + if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) { + struct ata_ering_entry *ent; + + ent = ata_ering_top(&dev->ering); + if (ent) + ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER; + } + } + + /* has private set_mode? */ + if (ap->ops->set_mode) + rc = ap->ops->set_mode(link, r_failed_dev); + else + rc = ata_do_set_mode(link, r_failed_dev); + + /* if transfer mode has changed, set DUBIOUS_XFER on device */ + ata_link_for_each_dev(dev, link) { + struct ata_eh_context *ehc = &link->eh_context; + u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno]; + u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno)); + + if (!ata_dev_enabled(dev)) + continue; + + if (dev->xfer_mode != saved_xfer_mode || + ata_ncq_enabled(dev) != saved_ncq) + dev->flags |= ATA_DFLAG_DUBIOUS_XFER; + } + + return rc; +} + +/** + * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset + * @dev: ATAPI device to clear UA for + * + * Resets and other operations can make an ATAPI device raise + * UNIT ATTENTION which causes the next operation to fail. This + * function clears UA. + * + * LOCKING: + * EH context (may sleep). + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static int atapi_eh_clear_ua(struct ata_device *dev) +{ + int i; + + for (i = 0; i < ATA_EH_UA_TRIES; i++) { + u8 sense_buffer[SCSI_SENSE_BUFFERSIZE]; + u8 sense_key = 0; + unsigned int err_mask; + + err_mask = atapi_eh_tur(dev, &sense_key); + if (err_mask != 0 && err_mask != AC_ERR_DEV) { + ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY " + "failed (err_mask=0x%x)\n", err_mask); + return -EIO; + } + + if (!err_mask || sense_key != UNIT_ATTENTION) + return 0; + + err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key); + if (err_mask) { + ata_dev_printk(dev, KERN_WARNING, "failed to clear " + "UNIT ATTENTION (err_mask=0x%x)\n", err_mask); + return -EIO; + } + } + + ata_dev_printk(dev, KERN_WARNING, + "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES); + + return 0; +} + +static int ata_link_nr_enabled(struct ata_link *link) +{ + struct ata_device *dev; + int cnt = 0; + + ata_link_for_each_dev(dev, link) + if (ata_dev_enabled(dev)) + cnt++; + return cnt; +} + +static int ata_link_nr_vacant(struct ata_link *link) +{ + struct ata_device *dev; + int cnt = 0; + + ata_link_for_each_dev(dev, link) + if (dev->class == ATA_DEV_UNKNOWN) + cnt++; + return cnt; +} + +static int ata_eh_skip_recovery(struct ata_link *link) +{ + struct ata_port *ap = link->ap; + struct ata_eh_context *ehc = &link->eh_context; + struct ata_device *dev; + + /* skip disabled links */ + if (link->flags & ATA_LFLAG_DISABLED) + return 1; + + /* thaw frozen port and recover failed devices */ + if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link)) + return 0; + + /* reset at least once if reset is requested */ + if ((ehc->i.action & ATA_EH_RESET) && + !(ehc->i.flags & ATA_EHI_DID_RESET)) + return 0; + + /* skip if class codes for all vacant slots are ATA_DEV_NONE */ + ata_link_for_each_dev(dev, link) { + if (dev->class == ATA_DEV_UNKNOWN && + ehc->classes[dev->devno] != ATA_DEV_NONE) + return 0; + } + + return 1; +} + +static int ata_eh_schedule_probe(struct ata_device *dev) +{ + struct ata_eh_context *ehc = &dev->link->eh_context; + + if (!(ehc->i.probe_mask & (1 << dev->devno)) || + (ehc->did_probe_mask & (1 << dev->devno))) + return 0; + + ata_eh_detach_dev(dev); + ata_dev_init(dev); + ehc->did_probe_mask |= (1 << dev->devno); + ehc->i.action |= ATA_EH_RESET; + ehc->saved_xfer_mode[dev->devno] = 0; + ehc->saved_ncq_enabled &= ~(1 << dev->devno); + + return 1; +} + +static int ata_eh_handle_dev_fail(struct ata_device *dev, int err) +{ + struct ata_eh_context *ehc = &dev->link->eh_context; + + ehc->tries[dev->devno]--; + + switch (err) { + case -ENODEV: + /* device missing or wrong IDENTIFY data, schedule probing */ + ehc->i.probe_mask |= (1 << dev->devno); + case -EINVAL: + /* give it just one more chance */ + ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); + case -EIO: + if (ehc->tries[dev->devno] == 1) { + /* This is the last chance, better to slow + * down than lose it. + */ + sata_down_spd_limit(ata_dev_phys_link(dev)); + if (dev->pio_mode > XFER_PIO_0) + ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); + } + } + + if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { + /* disable device if it has used up all its chances */ + ata_dev_disable(dev); + + /* detach if offline */ + if (ata_phys_link_offline(ata_dev_phys_link(dev))) + ata_eh_detach_dev(dev); + + /* schedule probe if necessary */ + if (ata_eh_schedule_probe(dev)) { + ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; + memset(ehc->cmd_timeout_idx[dev->devno], 0, + sizeof(ehc->cmd_timeout_idx[dev->devno])); + } + + return 1; + } else { + ehc->i.action |= ATA_EH_RESET; + return 0; + } +} + +/** + * ata_eh_recover - recover host port after error + * @ap: host port to recover + * @prereset: prereset method (can be NULL) + * @softreset: softreset method (can be NULL) + * @hardreset: hardreset method (can be NULL) + * @postreset: postreset method (can be NULL) + * @r_failed_link: out parameter for failed link + * + * This is the alpha and omega, eum and yang, heart and soul of + * libata exception handling. On entry, actions required to + * recover each link and hotplug requests are recorded in the + * link's eh_context. This function executes all the operations + * with appropriate retrials and fallbacks to resurrect failed + * devices, detach goners and greet newcomers. + * + * LOCKING: + * Kernel thread context (may sleep). + * + * RETURNS: + * 0 on success, -errno on failure. + */ +int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, + ata_reset_fn_t softreset, ata_reset_fn_t hardreset, + ata_postreset_fn_t postreset, + struct ata_link **r_failed_link) +{ + struct ata_link *link; + struct ata_device *dev; + int nr_failed_devs; + int rc; + unsigned long flags, deadline; + + DPRINTK("ENTER\n"); + + /* prep for recovery */ + ata_port_for_each_link(link, ap) { + struct ata_eh_context *ehc = &link->eh_context; + + /* re-enable link? */ + if (ehc->i.action & ATA_EH_ENABLE_LINK) { + ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK); + spin_lock_irqsave(ap->lock, flags); + link->flags &= ~ATA_LFLAG_DISABLED; + spin_unlock_irqrestore(ap->lock, flags); + ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK); + } + + ata_link_for_each_dev(dev, link) { + if (link->flags & ATA_LFLAG_NO_RETRY) + ehc->tries[dev->devno] = 1; + else + ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; + + /* collect port action mask recorded in dev actions */ + ehc->i.action |= ehc->i.dev_action[dev->devno] & + ~ATA_EH_PERDEV_MASK; + ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK; + + /* process hotplug request */ + if (dev->flags & ATA_DFLAG_DETACH) + ata_eh_detach_dev(dev); + + /* schedule probe if necessary */ + if (!ata_dev_enabled(dev)) + ata_eh_schedule_probe(dev); + } + } + + retry: + rc = 0; + nr_failed_devs = 0; + + /* if UNLOADING, finish immediately */ + if (ap->pflags & ATA_PFLAG_UNLOADING) + goto out; + + /* prep for EH */ + ata_port_for_each_link(link, ap) { + struct ata_eh_context *ehc = &link->eh_context; + + /* skip EH if possible. */ + if (ata_eh_skip_recovery(link)) + ehc->i.action = 0; + + ata_link_for_each_dev(dev, link) + ehc->classes[dev->devno] = ATA_DEV_UNKNOWN; + } + + /* reset */ + ata_port_for_each_link(link, ap) { + struct ata_eh_context *ehc = &link->eh_context; + + if (!(ehc->i.action & ATA_EH_RESET)) + continue; + + rc = ata_eh_reset(link, ata_link_nr_vacant(link), + prereset, softreset, hardreset, postreset); + if (rc) { + ata_link_printk(link, KERN_ERR, + "reset failed, giving up\n"); + goto out; + } + } + + do { + unsigned long now; + + /* + * clears ATA_EH_PARK in eh_info and resets + * ap->park_req_pending + */ + ata_eh_pull_park_action(ap); + + deadline = jiffies; + ata_port_for_each_link(link, ap) { + ata_link_for_each_dev(dev, link) { + struct ata_eh_context *ehc = &link->eh_context; + unsigned long tmp; + + if (dev->class != ATA_DEV_ATA) + continue; + if (!(ehc->i.dev_action[dev->devno] & + ATA_EH_PARK)) + continue; + tmp = dev->unpark_deadline; + if (time_before(deadline, tmp)) + deadline = tmp; + else if (time_before_eq(tmp, jiffies)) + continue; + if (ehc->unloaded_mask & (1 << dev->devno)) + continue; + + ata_eh_park_issue_cmd(dev, 1); + } + } + + now = jiffies; + if (time_before_eq(deadline, now)) + break; + + deadline = wait_for_completion_timeout(&ap->park_req_pending, + deadline - now); + } while (deadline); + ata_port_for_each_link(link, ap) { + ata_link_for_each_dev(dev, link) { + if (!(link->eh_context.unloaded_mask & + (1 << dev->devno))) + continue; + + ata_eh_park_issue_cmd(dev, 0); + ata_eh_done(link, dev, ATA_EH_PARK); + } + } + + /* the rest */ + ata_port_for_each_link(link, ap) { + struct ata_eh_context *ehc = &link->eh_context; + + /* revalidate existing devices and attach new ones */ + rc = ata_eh_revalidate_and_attach(link, &dev); + if (rc) + goto dev_fail; + + /* if PMP got attached, return, pmp EH will take care of it */ + if (link->device->class == ATA_DEV_PMP) { + ehc->i.action = 0; + return 0; + } + + /* configure transfer mode if necessary */ + if (ehc->i.flags & ATA_EHI_SETMODE) { + rc = ata_set_mode(link, &dev); + if (rc) + goto dev_fail; + ehc->i.flags &= ~ATA_EHI_SETMODE; + } + + /* If reset has been issued, clear UA to avoid + * disrupting the current users of the device. + */ + if (ehc->i.flags & ATA_EHI_DID_RESET) { + ata_link_for_each_dev(dev, link) { + if (dev->class != ATA_DEV_ATAPI) + continue; + rc = atapi_eh_clear_ua(dev); + if (rc) + goto dev_fail; + } + } + + /* configure link power saving */ + if (ehc->i.action & ATA_EH_LPM) + ata_link_for_each_dev(dev, link) + ata_dev_enable_pm(dev, ap->pm_policy); + + /* this link is okay now */ + ehc->i.flags = 0; + continue; + +dev_fail: + nr_failed_devs++; + ata_eh_handle_dev_fail(dev, rc); + + if (ap->pflags & ATA_PFLAG_FROZEN) { + /* PMP reset requires working host port. + * Can't retry if it's frozen. + */ + if (sata_pmp_attached(ap)) + goto out; + break; + } + } + + if (nr_failed_devs) + goto retry; + + out: + if (rc && r_failed_link) + *r_failed_link = link; + + DPRINTK("EXIT, rc=%d\n", rc); + return rc; +} + +/** + * ata_eh_finish - finish up EH + * @ap: host port to finish EH for + * + * Recovery is complete. Clean up EH states and retry or finish + * failed qcs. + * + * LOCKING: + * None. + */ +void ata_eh_finish(struct ata_port *ap) +{ + int tag; + + /* retry or finish qcs */ + for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { + struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); + + if (!(qc->flags & ATA_QCFLAG_FAILED)) + continue; + + if (qc->err_mask) { + /* FIXME: Once EH migration is complete, + * generate sense data in this function, + * considering both err_mask and tf. + */ + if (qc->flags & ATA_QCFLAG_RETRY) + ata_eh_qc_retry(qc); + else + ata_eh_qc_complete(qc); + } else { + if (qc->flags & ATA_QCFLAG_SENSE_VALID) { + ata_eh_qc_complete(qc); + } else { + /* feed zero TF to sense generation */ + memset(&qc->result_tf, 0, sizeof(qc->result_tf)); + ata_eh_qc_retry(qc); + } + } + } + + /* make sure nr_active_links is zero after EH */ + WARN_ON(ap->nr_active_links); + ap->nr_active_links = 0; +} + +/** + * ata_do_eh - do standard error handling + * @ap: host port to handle error for + * + * @prereset: prereset method (can be NULL) + * @softreset: softreset method (can be NULL) + * @hardreset: hardreset method (can be NULL) + * @postreset: postreset method (can be NULL) + * + * Perform standard error handling sequence. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, + ata_reset_fn_t softreset, ata_reset_fn_t hardreset, + ata_postreset_fn_t postreset) +{ + struct ata_device *dev; + int rc; + + ata_eh_autopsy(ap); + ata_eh_report(ap); + + rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset, + NULL); + if (rc) { + ata_link_for_each_dev(dev, &ap->link) + ata_dev_disable(dev); + } + + ata_eh_finish(ap); +} + +/** + * ata_std_error_handler - standard error handler + * @ap: host port to handle error for + * + * Standard error handler + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_std_error_handler(struct ata_port *ap) +{ + struct ata_port_operations *ops = ap->ops; + ata_reset_fn_t hardreset = ops->hardreset; + + /* ignore built-in hardreset if SCR access is not available */ + if (ata_is_builtin_hardreset(hardreset) && !sata_scr_valid(&ap->link)) + hardreset = NULL; + + ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset); +} + +#ifdef CONFIG_PM +/** + * ata_eh_handle_port_suspend - perform port suspend operation + * @ap: port to suspend + * + * Suspend @ap. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +static void ata_eh_handle_port_suspend(struct ata_port *ap) +{ + unsigned long flags; + int rc = 0; + + /* are we suspending? */ + spin_lock_irqsave(ap->lock, flags); + if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || + ap->pm_mesg.event == PM_EVENT_ON) { + spin_unlock_irqrestore(ap->lock, flags); + return; + } + spin_unlock_irqrestore(ap->lock, flags); + + WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); + + /* tell ACPI we're suspending */ + rc = ata_acpi_on_suspend(ap); + if (rc) + goto out; + + /* suspend */ + ata_eh_freeze_port(ap); + + if (ap->ops->port_suspend) + rc = ap->ops->port_suspend(ap, ap->pm_mesg); + + ata_acpi_set_state(ap, PMSG_SUSPEND); + out: + /* report result */ + spin_lock_irqsave(ap->lock, flags); + + ap->pflags &= ~ATA_PFLAG_PM_PENDING; + if (rc == 0) + ap->pflags |= ATA_PFLAG_SUSPENDED; + else if (ap->pflags & ATA_PFLAG_FROZEN) + ata_port_schedule_eh(ap); + + if (ap->pm_result) { + *ap->pm_result = rc; + ap->pm_result = NULL; + } + + spin_unlock_irqrestore(ap->lock, flags); + + return; +} + +/** + * ata_eh_handle_port_resume - perform port resume operation + * @ap: port to resume + * + * Resume @ap. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +static void ata_eh_handle_port_resume(struct ata_port *ap) +{ + unsigned long flags; + int rc = 0; + + /* are we resuming? */ + spin_lock_irqsave(ap->lock, flags); + if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || + ap->pm_mesg.event != PM_EVENT_ON) { + spin_unlock_irqrestore(ap->lock, flags); + return; + } + spin_unlock_irqrestore(ap->lock, flags); + + WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); + + ata_acpi_set_state(ap, PMSG_ON); + + if (ap->ops->port_resume) + rc = ap->ops->port_resume(ap); + + /* tell ACPI that we're resuming */ + ata_acpi_on_resume(ap); + + /* report result */ + spin_lock_irqsave(ap->lock, flags); + ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); + if (ap->pm_result) { + *ap->pm_result = rc; + ap->pm_result = NULL; + } + spin_unlock_irqrestore(ap->lock, flags); +} +#endif /* CONFIG_PM */ |
