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s390/ap: Support AP card SCLP config and deconfig operations

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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>
This commit is contained in:
Harald Freudenberger 2020-07-27 14:49:34 +02:00 committed by Vasily Gorbik
parent 0671cc1048
commit 5caa2af971
1 changed files with 24 additions and 1 deletions
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25
drivers/s390/crypto/ap_card.c
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@ -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,