Commit f456393e authored by Darrick J. Wong's avatar Darrick J. Wong Committed by James Bottomley

[SCSI] libsas: modify error handler to use scsi_eh_* functions

This patch adds an EH done queue to sas_ha, converts the error handling
strategy function and the sas_scsi_task_done functions in libsas to use
the scsi_eh_* commands for error'd commands, and adds checks for the
INITIATOR_ABORTED flag so that we do the right thing if a sas_task has
been aborted by the initiator.
Signed-off-by: default avatarDarrick J. Wong <djwong@us.ibm.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent b4d38e38
......@@ -112,6 +112,8 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
}
}
INIT_LIST_HEAD(&sas_ha->eh_done_q);
return 0;
Undo_ports:
......
......@@ -29,6 +29,7 @@
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"
......@@ -46,6 +47,7 @@ static void sas_scsi_task_done(struct sas_task *task)
{
struct task_status_struct *ts = &task->task_status;
struct scsi_cmnd *sc = task->uldd_task;
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
unsigned ts_flags = task->task_state_flags;
int hs = 0, stat = 0;
......@@ -116,7 +118,7 @@ static void sas_scsi_task_done(struct sas_task *task)
sas_free_task(task);
/* This is very ugly but this is how SCSI Core works. */
if (ts_flags & SAS_TASK_STATE_ABORTED)
scsi_finish_command(sc);
scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
else
sc->scsi_done(sc);
}
......@@ -307,6 +309,15 @@ static enum task_disposition sas_scsi_find_task(struct sas_task *task)
spin_unlock_irqrestore(&core->task_queue_lock, flags);
}
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("%s: task 0x%p already aborted\n",
__FUNCTION__, task);
return TASK_IS_ABORTED;
}
spin_unlock_irqrestore(&task->task_state_lock, flags);
for (i = 0; i < 5; i++) {
SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
res = si->dft->lldd_abort_task(task);
......@@ -409,13 +420,16 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
SAS_DPRINTK("going over list...\n");
list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
struct sas_task *task = TO_SAS_TASK(cmd);
list_del_init(&cmd->eh_entry);
if (!task) {
SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
continue;
}
SAS_DPRINTK("trying to find task 0x%p\n", task);
list_del_init(&cmd->eh_entry);
res = sas_scsi_find_task(task);
cmd->eh_eflags = 0;
shost->host_failed--;
switch (res) {
case TASK_IS_DONE:
......@@ -491,6 +505,7 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
}
}
out:
scsi_eh_flush_done_q(&ha->eh_done_q);
SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
return;
clear_q:
......@@ -508,12 +523,18 @@ enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
unsigned long flags;
if (!task) {
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
cmd, task);
return EH_HANDLED;
}
spin_lock_irqsave(&task->task_state_lock, flags);
if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
"EH_NOT_HANDLED\n", cmd, task);
return EH_NOT_HANDLED;
}
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
spin_unlock_irqrestore(&task->task_state_lock, flags);
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
......
......@@ -338,6 +338,8 @@ struct sas_ha_struct {
void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);
void *lldd_ha; /* not touched by sas class code */
struct list_head eh_done_q;
};
#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
......@@ -530,9 +532,10 @@ struct sas_task {
#define SAS_TASK_STATE_PENDING 1
#define SAS_TASK_STATE_DONE 2
#define SAS_TASK_STATE_ABORTED 4
#define SAS_TASK_STATE_PENDING 1
#define SAS_TASK_STATE_DONE 2
#define SAS_TASK_STATE_ABORTED 4
#define SAS_TASK_INITIATOR_ABORTED 8
static inline struct sas_task *sas_alloc_task(gfp_t flags)
{
......
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