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authorJames Bottomley <James.Bottomley@suse.de>2011-01-23 18:44:12 +0300
committerJeff Garzik <jgarzik@redhat.com>2011-03-02 10:36:45 +0300
commit00dd4998a60599d98b4d6635820a1fbeafa5b021 (patch)
tree6a7ecd27007856691964399eec8882b8d8ca8560 /drivers/scsi/libsas
parent0e0b494ca8c54a7297d0cc549405091019b3b77e (diff)
downloadlinux-00dd4998a60599d98b4d6635820a1fbeafa5b021.tar.xz
libsas: convert to libata new error handler
The conversion is quite complex given that the libata new error handler has to be hooked into the current libsas timeout and error handling. The way this is done is to process all the failed commands via libsas first, but if they have no underlying sas task (and they're on a sata device) assume they are destined for the libata error handler and send them accordingly. Finally, activate the port recovery of the libata error handler for each port known to the host. This is somewhat suboptimal, since that port may not need recovering, but given the current architecture of the libata error handler, it's the only way; and the spurious activation is harmless. Signed-off-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_ata.c87
-rw-r--r--drivers/scsi/libsas/sas_scsi_host.c14
2 files changed, 93 insertions, 8 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index e1a395b438ee..8f56d5fbf6ec 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -238,37 +238,43 @@ static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
return true;
}
-static void sas_ata_phy_reset(struct ata_port *ap)
+static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
{
+ struct ata_port *ap = link->ap;
struct domain_device *dev = ap->private_data;
struct sas_internal *i =
to_sas_internal(dev->port->ha->core.shost->transportt);
int res = TMF_RESP_FUNC_FAILED;
+ int ret = 0;
if (i->dft->lldd_I_T_nexus_reset)
res = i->dft->lldd_I_T_nexus_reset(dev);
- if (res != TMF_RESP_FUNC_COMPLETE)
+ if (res != TMF_RESP_FUNC_COMPLETE) {
SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
+ ret = -EAGAIN;
+ }
switch (dev->sata_dev.command_set) {
case ATA_COMMAND_SET:
SAS_DPRINTK("%s: Found ATA device.\n", __func__);
- ap->link.device[0].class = ATA_DEV_ATA;
+ *class = ATA_DEV_ATA;
break;
case ATAPI_COMMAND_SET:
SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
- ap->link.device[0].class = ATA_DEV_ATAPI;
+ *class = ATA_DEV_ATAPI;
break;
default:
SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
__func__,
dev->sata_dev.command_set);
- ap->link.device[0].class = ATA_DEV_UNKNOWN;
+ *class = ATA_DEV_UNKNOWN;
break;
}
ap->cbl = ATA_CBL_SATA;
+ return ret;
}
static void sas_ata_post_internal(struct ata_queued_cmd *qc)
@@ -349,7 +355,11 @@ static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
}
static struct ata_port_operations sas_sata_ops = {
- .phy_reset = sas_ata_phy_reset,
+ .prereset = ata_std_prereset,
+ .softreset = NULL,
+ .hardreset = sas_ata_hard_reset,
+ .postreset = ata_std_postreset,
+ .error_handler = ata_std_error_handler,
.post_internal_cmd = sas_ata_post_internal,
.qc_defer = ata_std_qc_defer,
.qc_prep = ata_noop_qc_prep,
@@ -781,3 +791,68 @@ int sas_discover_sata(struct domain_device *dev)
return res;
}
+
+void sas_ata_strategy_handler(struct Scsi_Host *shost)
+{
+ struct scsi_device *sdev;
+
+ shost_for_each_device(sdev, shost) {
+ struct domain_device *ddev = sdev_to_domain_dev(sdev);
+ struct ata_port *ap = ddev->sata_dev.ap;
+
+ if (!dev_is_sata(ddev))
+ continue;
+
+ ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
+ ata_scsi_port_error_handler(shost, ap);
+ }
+}
+
+int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
+ enum blk_eh_timer_return *rtn)
+{
+ struct domain_device *ddev = cmd_to_domain_dev(cmd);
+
+ if (!dev_is_sata(ddev) || task)
+ return 0;
+
+ /* we're a sata device with no task, so this must be a libata
+ * eh timeout. Ideally should hook into libata timeout
+ * handling, but there's no point, it just wants to activate
+ * the eh thread */
+ *rtn = BLK_EH_NOT_HANDLED;
+ return 1;
+}
+
+int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
+ struct list_head *done_q)
+{
+ int rtn = 0;
+ struct scsi_cmnd *cmd, *n;
+ struct ata_port *ap;
+
+ do {
+ LIST_HEAD(sata_q);
+
+ ap = NULL;
+
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
+ struct domain_device *ddev = cmd_to_domain_dev(cmd);
+
+ if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
+ continue;
+ if(ap && ap != ddev->sata_dev.ap)
+ continue;
+ ap = ddev->sata_dev.ap;
+ rtn = 1;
+ list_move(&cmd->eh_entry, &sata_q);
+ }
+
+ if (!list_empty(&sata_q)) {
+ ata_port_printk(ap, KERN_DEBUG,"sas eh calling libata cmd error handler\n");
+ ata_scsi_cmd_error_handler(shost, ap, &sata_q);
+ }
+ } while (ap);
+
+ return rtn;
+}
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 9a7aaf5f1311..67758ea8eb7f 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -663,11 +663,16 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
* scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
* command we see here has no sas_task and is thus unknown to the HA.
*/
- if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
- scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
+ if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
+ if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
+ scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
out:
+ /* now link into libata eh --- if we have any ata devices */
+ sas_ata_strategy_handler(shost);
+
scsi_eh_flush_done_q(&ha->eh_done_q);
+
SAS_DPRINTK("--- Exit %s\n", __func__);
return;
}
@@ -676,6 +681,11 @@ enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
{
struct sas_task *task = TO_SAS_TASK(cmd);
unsigned long flags;
+ enum blk_eh_timer_return rtn;
+
+ if (sas_ata_timed_out(cmd, task, &rtn))
+ return rtn;
+
if (!task) {
cmd->request->timeout /= 2;