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authorHarald Freudenberger <freude@linux.ibm.com>2020-07-27 15:49:34 +0300
committerVasily Gorbik <gor@linux.ibm.com>2020-10-07 22:50:01 +0300
commit5caa2af97118308c79f29cc9876aec3ed504f9b0 (patch)
tree347518c4f2bfe103deed2365d5f7fa45eb2783f0 /drivers/s390/crypto/ap_card.c
parent0671cc1048744c9a6f1c896baa85966a5abc42a0 (diff)
downloadlinux-5caa2af97118308c79f29cc9876aec3ed504f9b0.tar.xz
s390/ap: Support AP card SCLP config and deconfig operations
Support SCLP AP adapter config and deconfig operations: The sysfs deconfig attribute /sys/devices/ap/cardxx/deconfig for each AP card is now read-write. Writing in a '1' triggers a synchronous SCLP request to configure the adapter, writing in a '0' sends a synchronous SCLP deconfigure request. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/ap_card.c')
-rw-r--r--drivers/s390/crypto/ap_card.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c
index bf1e964b0048..d98bdd28d23e 100644
--- a/drivers/s390/crypto/ap_card.c
+++ b/drivers/s390/crypto/ap_card.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <asm/facility.h>
+#include <asm/sclp.h>
#include "ap_bus.h"
@@ -147,7 +148,29 @@ static ssize_t config_show(struct device *dev,
return scnprintf(buf, PAGE_SIZE, "%d\n", ac->config ? 1 : 0);
}
-static DEVICE_ATTR_RO(config);
+static ssize_t config_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc = 0, cfg;
+ struct ap_card *ac = to_ap_card(dev);
+
+ if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
+ return -EINVAL;
+
+ if (cfg && !ac->config)
+ rc = sclp_ap_configure(ac->id);
+ else if (!cfg && ac->config)
+ rc = sclp_ap_deconfigure(ac->id);
+ if (rc)
+ return rc;
+
+ ac->config = cfg ? true : false;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(config);
static struct attribute *ap_card_dev_attrs[] = {
&dev_attr_hwtype.attr,