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[SCSI] ibmvscsi: treat busy and error conditions separately 

This patch fixes a condition where ibmvscsi treats a transport error as a
"busy" condition, so no errors were returned to the scsi mid-layer.
In a RAID environment this means that I/O hung rather than failing
over.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Dave C Boutcher 2006-06-12 21:22:51 -05:00 committed by James Bottomley
parent c65b1445d1
commit cefbda2d6c
2 changed files with 52 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/scsi/ibmvscsi/ibmvscsi.c
View File

@ -535,6 +535,7 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
struct ibmvscsi_host_data *hostdata)
{
u64 *crq_as_u64 = (u64 *) &evt_struct->crq;
int request_status;
int rc;
/* If we have exhausted our request limit, just fail this request.
@ -542,9 +543,18 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
* (such as task management requests) that the mid layer may think we
* can handle more requests (can_queue) when we actually can't
*/
if ((evt_struct->crq.format == VIOSRP_SRP_FORMAT) &&
(atomic_dec_if_positive(&hostdata->request_limit) < 0))
goto send_error;
if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
request_status =
atomic_dec_if_positive(&hostdata->request_limit);
/* If request limit was -1 when we started, it is now even
* less than that
*/
if (request_status < -1)
goto send_error;
/* Otherwise, if we have run out of requests */
else if (request_status < 0)
goto send_busy;
}
/* Copy the IU into the transfer area */
*evt_struct->xfer_iu = evt_struct->iu;
@ -567,11 +577,23 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
return 0;
send_error:
send_busy:
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
free_event_struct(&hostdata->pool, evt_struct);
return SCSI_MLQUEUE_HOST_BUSY;
send_error:
unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
if (evt_struct->cmnd != NULL) {
evt_struct->cmnd->result = DID_ERROR << 16;
evt_struct->cmnd_done(evt_struct->cmnd);
} else if (evt_struct->done)
evt_struct->done(evt_struct);
free_event_struct(&hostdata->pool, evt_struct);
return 0;
}
/**
@ -1184,27 +1206,37 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
return;
case 0xFF: /* Hypervisor telling us the connection is closed */
scsi_block_requests(hostdata->host);
atomic_set(&hostdata->request_limit, 0);
if (crq->format == 0x06) {
/* We need to re-setup the interpartition connection */
printk(KERN_INFO
"ibmvscsi: Re-enabling adapter!\n");
atomic_set(&hostdata->request_limit, -1);
purge_requests(hostdata, DID_REQUEUE);
if (ibmvscsi_reenable_crq_queue(&hostdata->queue,
hostdata) == 0)
if (ibmvscsi_send_crq(hostdata,
0xC001000000000000LL, 0))
if ((ibmvscsi_reenable_crq_queue(&hostdata->queue,
hostdata) == 0) ||
(ibmvscsi_send_crq(hostdata,
0xC001000000000000LL, 0))) {
atomic_set(&hostdata->request_limit,
-1);
printk(KERN_ERR
"ibmvscsi: transmit error after"
"ibmvscsi: error after"
" enable\n");
}
} else {
printk(KERN_INFO
"ibmvscsi: Virtual adapter failed rc %d!\n",
crq->format);
atomic_set(&hostdata->request_limit, -1);
purge_requests(hostdata, DID_ERROR);
ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
if ((ibmvscsi_reset_crq_queue(&hostdata->queue,
hostdata)) ||
(ibmvscsi_send_crq(hostdata,
0xC001000000000000LL, 0))) {
atomic_set(&hostdata->request_limit,
-1);
printk(KERN_ERR
"ibmvscsi: error after reset\n");
}
}
scsi_unblock_requests(hostdata->host);
return;
@ -1467,6 +1499,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
struct Scsi_Host *host;
struct device *dev = &vdev->dev;
unsigned long wait_switch = 0;
int rc;
vdev->dev.driver_data = NULL;
@ -1484,8 +1517,8 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
atomic_set(&hostdata->request_limit, -1);
hostdata->host->max_sectors = 32 * 8; /* default max I/O 32 pages */
if (ibmvscsi_init_crq_queue(&hostdata->queue, hostdata,
max_requests) != 0) {
rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_requests);
if (rc != 0 && rc != H_RESOURCE) {
printk(KERN_ERR "ibmvscsi: couldn't initialize crq\n");
goto init_crq_failed;
}
@ -1505,7 +1538,8 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
* to fail if the other end is not acive. In that case we don't
* want to scan
*/
if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0) {
if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
|| rc == H_RESOURCE) {
/*
* Wait around max init_timeout secs for the adapter to finish
* initializing. When we are done initializing, we will have a

5
drivers/scsi/ibmvscsi/rpa_vscsi.c
View File

@ -208,6 +208,7 @@ int ibmvscsi_init_crq_queue(struct crq_queue *queue,
int max_requests)
{
int rc;
int retrc;
struct vio_dev *vdev = to_vio_dev(hostdata->dev);
queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
@ -226,7 +227,7 @@ int ibmvscsi_init_crq_queue(struct crq_queue *queue,
gather_partition_info();
set_adapter_info(hostdata);
rc = plpar_hcall_norets(H_REG_CRQ,
retrc = rc = plpar_hcall_norets(H_REG_CRQ,
vdev->unit_address,
queue->msg_token, PAGE_SIZE);
if (rc == H_RESOURCE)
@ -263,7 +264,7 @@ int ibmvscsi_init_crq_queue(struct crq_queue *queue,
tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
(unsigned long)hostdata);
return 0;
return retrc;
req_irq_failed:
do {