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scsi: ibmvscsi: redo driver work thread to use enum action states 

The current implemenation relies on two flags in the driver's private host
structure to signal the need for a host reset or to reenable the CRQ after
a LPAR migration. This patch does away with those flags and introduces a
single action flag and defined enums for the supported kthread work
actions. Lastly, the if/else logic is replaced with a switch statement.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tyrel Datwyler 2019-05-02 19:50:57 -05:00 committed by Martin K. Petersen
parent 2e22520475
commit 6e40de8b6b
2 changed files with 49 additions and 21 deletions
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61
drivers/scsi/ibmvscsi/ibmvscsi.c
View File

@ -828,7 +828,7 @@ static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
atomic_set(&hostdata->request_limit, 0);
purge_requests(hostdata, DID_ERROR);
hostdata->reset_crq = 1;
hostdata->action = IBMVSCSI_HOST_ACTION_RESET;
wake_up(&hostdata->work_wait_q);
}
@ -1797,7 +1797,7 @@ static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
/* We need to re-setup the interpartition connection */
dev_info(hostdata->dev, "Re-enabling adapter!\n");
hostdata->client_migrated = 1;
hostdata->reenable_crq = 1;
hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE;
purge_requests(hostdata, DID_REQUEUE);
wake_up(&hostdata->work_wait_q);
} else {
@ -2116,48 +2116,71 @@ static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
{
unsigned long flags;
int rc;
char *action = "reset";
if (hostdata->reset_crq) {
smp_rmb();
hostdata->reset_crq = 0;
spin_lock_irqsave(hostdata->host->host_lock, flags);
switch (hostdata->action) {
case IBMVSCSI_HOST_ACTION_NONE:
break;
case IBMVSCSI_HOST_ACTION_RESET:
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
spin_lock_irqsave(hostdata->host->host_lock, flags);
if (!rc)
rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
vio_enable_interrupts(to_vio_dev(hostdata->dev));
} else if (hostdata->reenable_crq) {
smp_rmb();
break;
case IBMVSCSI_HOST_ACTION_REENABLE:
action = "enable";
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
hostdata->reenable_crq = 0;
spin_lock_irqsave(hostdata->host->host_lock, flags);
if (!rc)
rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
} else
return;
break;
default:
break;
}
hostdata->action = IBMVSCSI_HOST_ACTION_NONE;
if (rc) {
atomic_set(&hostdata->request_limit, -1);
dev_err(hostdata->dev, "error after %s\n", action);
}
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
scsi_unblock_requests(hostdata->host);
}
static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
{
if (kthread_should_stop())
return 1;
else if (hostdata->reset_crq) {
smp_rmb();
return 1;
} else if (hostdata->reenable_crq) {
smp_rmb();
return 1;
switch (hostdata->action) {
case IBMVSCSI_HOST_ACTION_NONE:
return 0;
case IBMVSCSI_HOST_ACTION_RESET:
case IBMVSCSI_HOST_ACTION_REENABLE:
default:
break;
}
return 0;
return 1;
}
static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
{
unsigned long flags;
int rc;
spin_lock_irqsave(hostdata->host->host_lock, flags);
rc = __ibmvscsi_work_to_do(hostdata);
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
return rc;
}
static int ibmvscsi_work(void *data)

9
drivers/scsi/ibmvscsi/ibmvscsi.h
View File

@ -88,13 +88,18 @@ struct event_pool {
dma_addr_t iu_token;
};
enum ibmvscsi_host_action {
IBMVSCSI_HOST_ACTION_NONE = 0,
IBMVSCSI_HOST_ACTION_RESET,
IBMVSCSI_HOST_ACTION_REENABLE,
};
/* all driver data associated with a host adapter */
struct ibmvscsi_host_data {
struct list_head host_list;
atomic_t request_limit;
int client_migrated;
int reset_crq;
int reenable_crq;
enum ibmvscsi_host_action action;
struct device *dev;
struct event_pool pool;
struct crq_queue queue;