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s390/ap: enable sysfs attribute scans to force AP bus rescan

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This patch switches the sysfs attribute /sys/bus/ap/scans
from read-only to read-write. If there is something written
to this attribute, an AP bus rescan is forced. If an AP
bus scan is triggered this way a debug feature entry line
reports this in /sys/kernel/debug/s390dbf/ap/sprintf.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Jakob Naucke <naucke@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Harald Freudenberger 2022-02-16 12:30:34 +01:00 committed by Vasily Gorbik
parent 283915850a
commit 8944d05f9b
1 changed files with 11 additions and 1 deletions
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12
drivers/s390/crypto/ap_bus.c
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@ -1472,7 +1472,17 @@ static ssize_t scans_show(struct bus_type *bus, char *buf)
atomic64_read(&ap_scan_bus_count));
}
static BUS_ATTR_RO(scans);
static ssize_t scans_store(struct bus_type *bus, const char *buf,
size_t count)
{
AP_DBF_INFO("%s force AP bus rescan\n", __func__);
ap_bus_force_rescan();
return count;
}
static BUS_ATTR_RW(scans);
static ssize_t bindings_show(struct bus_type *bus, char *buf)
{