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[SCSI] libsas: async ata-eh

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Once sas_ata_hard_reset() starts honoring the 'deadline' parameter a
pathological configuration could take 25 seconds per ata device
(serialized) to recover.  Run per-port recoveries in parallel.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams 2011-12-04 01:06:24 -08:00 committed by James Bottomley
parent 89d3cf6ac3
commit 50824d6c56
1 changed files with 14 additions and 3 deletions
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17
drivers/scsi/libsas/sas_ata.c
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@ -23,6 +23,7 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/async.h>
#include <scsi/sas_ata.h>
#include "sas_internal.h"
@ -605,10 +606,21 @@ int sas_discover_sata(struct domain_device *dev)
return 0;
}
static void async_sas_ata_eh(void *data, async_cookie_t cookie)
{
struct domain_device *dev = data;
struct ata_port *ap = dev->sata_dev.ap;
struct sas_ha_struct *ha = dev->port->ha;
ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
ata_scsi_port_error_handler(ha->core.shost, ap);
}
void sas_ata_strategy_handler(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
LIST_HEAD(async);
/* it's ok to defer revalidation events during ata eh, these
* disks are in one of three states:
@ -622,14 +634,13 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
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);
async_schedule_domain(async_sas_ata_eh, ddev, &async);
}
async_synchronize_full_domain(&async);
sas_enable_revalidation(sas_ha);
}