From: Harald Freudenberger <freude@linux.ibm.com>
Date: Mon, 27 Jul 2020 14:49:34 +0200
Subject: s390/ap: Support AP card SCLP config and deconfig operations
Git-commit: 5caa2af97118308c79f29cc9876aec3ed504f9b0
Patch-mainline: v5.10-rc1
References: jsc#SLE-13815 bsc#1178402 LTC#186349

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/crypto/ap_card.c |   25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

--- 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
 	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,