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fsi: sbefifo: Add sysfs file indicating a timeout error 

The SBEFIFO timeout error requires special handling in userspace
to do recovery operations. Add a sysfs file to indicate a timeout
error, and notify pollers when a timeout occurs.

This will be used by the openpower-occ-control application.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20211019211749.38059-3-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Eddie James 2021-10-19 16:17:49 -05:00 committed by Joel Stanley
parent 9a93de620e
commit 826280348e
1 changed files with 16 additions and 0 deletions
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16
drivers/fsi/fsi-sbefifo.c
View File

@ -124,6 +124,7 @@ struct sbefifo {
bool broken;
bool dead;
bool async_ffdc;
bool timed_out;
};
struct sbefifo_user {
@ -136,6 +137,14 @@ struct sbefifo_user {
static DEFINE_MUTEX(sbefifo_ffdc_mutex);
static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sbefifo *sbefifo = container_of(dev, struct sbefifo, dev);
return sysfs_emit(buf, "%d\n", sbefifo->timed_out ? 1 : 0);
}
static DEVICE_ATTR_RO(timeout);
static void __sbefifo_dump_ffdc(struct device *dev, const __be32 *ffdc,
size_t ffdc_sz, bool internal)
@ -462,11 +471,14 @@ static int sbefifo_wait(struct sbefifo *sbefifo, bool up,
break;
}
if (!ready) {
sysfs_notify(&sbefifo->dev.kobj, NULL, dev_attr_timeout.attr.name);
sbefifo->timed_out = true;
dev_err(dev, "%s FIFO Timeout ! status=%08x\n", up ? "UP" : "DOWN", sts);
return -ETIMEDOUT;
}
dev_vdbg(dev, "End of wait status: %08x\n", sts);
sbefifo->timed_out = false;
*status = sts;
return 0;
@ -993,6 +1005,8 @@ static int sbefifo_probe(struct device *dev)
child_name);
}
device_create_file(&sbefifo->dev, &dev_attr_timeout);
return 0;
err_free_minor:
fsi_free_minor(sbefifo->dev.devt);
@ -1018,6 +1032,8 @@ static int sbefifo_remove(struct device *dev)
dev_dbg(dev, "Removing sbefifo device...\n");
device_remove_file(&sbefifo->dev, &dev_attr_timeout);
mutex_lock(&sbefifo->lock);
sbefifo->dead = true;
mutex_unlock(&sbefifo->lock);