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s390/sclp: add timeout for queued requests

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This patch adds a timeout option for queued requests and introduces
sclp_sync_request_timeout() to use this timer. With this, blocking the
system too long, e.g. during an SE reboot, can be avoided in critical
situations like CPU and memory hotplug.
Since there is no way to cancel a running request, this timeout only
applies to queued requests that have not yet been started.

Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
2014-03-31 16:18:29 +02:00
committed by Martin Schwidefsky
parent 1b6a19b34d
commit 9f0128f9e7
3 changed files with 104 additions and 4 deletions
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17
drivers/s390/char/sclp_cmd.c
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@@ -36,6 +36,11 @@ static void sclp_sync_callback(struct sclp_req *req, void *data)
}
int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
{
return sclp_sync_request_timeout(cmd, sccb, 0);
}
int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
{
struct completion completion;
struct sclp_req *request;
@@ -44,6 +49,8 @@ int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
request = kzalloc(sizeof(*request), GFP_KERNEL);
if (!request)
return -ENOMEM;
if (timeout)
request->queue_timeout = timeout;
request->command = cmd;
request->sccb = sccb;
request->status = SCLP_REQ_FILLED;
@@ -110,7 +117,8 @@ int sclp_get_cpu_info(struct sclp_cpu_info *info)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
SCLP_QUEUE_INTERVAL);
if (rc)
goto out;
if (sccb->header.response_code != 0x0010) {
@@ -144,7 +152,7 @@ static int do_cpu_configure(sclp_cmdw_t cmd)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = sclp_sync_request(cmd, sccb);
rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
if (rc)
goto out;
switch (sccb->header.response_code) {
@@ -214,7 +222,7 @@ static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
return -ENOMEM;
sccb->header.length = PAGE_SIZE;
sccb->rn = rn;
rc = sclp_sync_request(cmd, sccb);
rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
if (rc)
goto out;
switch (sccb->header.response_code) {
@@ -269,7 +277,8 @@ static int sclp_attach_storage(u8 id)
if (!sccb)
return -ENOMEM;
sccb->header.length = PAGE_SIZE;
rc = sclp_sync_request(0x00080001 | id << 8, sccb);
rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
SCLP_QUEUE_INTERVAL);
if (rc)
goto out;
switch (sccb->header.response_code) {