1 files changed, 252 insertions, 0 deletions

diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c
new file mode 100644
index 000000000..6b2170cf1
--- /dev/null
+++ b/drivers/s390/crypto/ap_card.c
@@ -0,0 +1,252 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2016
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ *
+ * Adjunct processor bus, card related code.
+ */
+
+#define KMSG_COMPONENT "ap"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <asm/facility.h>
+#include <asm/sclp.h>
+
+#include "ap_bus.h"
+
+/*
+ * AP card related attributes.
+ */
+static ssize_t hwtype_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
+}
+
+static DEVICE_ATTR_RO(hwtype);
+
+static ssize_t raw_hwtype_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
+}
+
+static DEVICE_ATTR_RO(raw_hwtype);
+
+static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
+}
+
+static DEVICE_ATTR_RO(depth);
+
+static ssize_t ap_functions_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
+}
+
+static DEVICE_ATTR_RO(ap_functions);
+
+static ssize_t request_count_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+	u64 req_cnt;
+
+	req_cnt = 0;
+	spin_lock_bh(&ap_queues_lock);
+	req_cnt = atomic64_read(&ac->total_request_count);
+	spin_unlock_bh(&ap_queues_lock);
+	return scnprintf(buf, PAGE_SIZE, "%llu\n", req_cnt);
+}
+
+static ssize_t request_count_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t count)
+{
+	int bkt;
+	struct ap_queue *aq;
+	struct ap_card *ac = to_ap_card(dev);
+
+	spin_lock_bh(&ap_queues_lock);
+	hash_for_each(ap_queues, bkt, aq, hnode)
+		if (ac == aq->card)
+			aq->total_request_count = 0;
+	spin_unlock_bh(&ap_queues_lock);
+	atomic64_set(&ac->total_request_count, 0);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(request_count);
+
+static ssize_t requestq_count_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	int bkt;
+	struct ap_queue *aq;
+	unsigned int reqq_cnt;
+	struct ap_card *ac = to_ap_card(dev);
+
+	reqq_cnt = 0;
+	spin_lock_bh(&ap_queues_lock);
+	hash_for_each(ap_queues, bkt, aq, hnode)
+		if (ac == aq->card)
+			reqq_cnt += aq->requestq_count;
+	spin_unlock_bh(&ap_queues_lock);
+	return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
+}
+
+static DEVICE_ATTR_RO(requestq_count);
+
+static ssize_t pendingq_count_show(struct device *dev,
+				   struct device_attribute *attr, char *buf)
+{
+	int bkt;
+	struct ap_queue *aq;
+	unsigned int penq_cnt;
+	struct ap_card *ac = to_ap_card(dev);
+
+	penq_cnt = 0;
+	spin_lock_bh(&ap_queues_lock);
+	hash_for_each(ap_queues, bkt, aq, hnode)
+		if (ac == aq->card)
+			penq_cnt += aq->pendingq_count;
+	spin_unlock_bh(&ap_queues_lock);
+	return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
+}
+
+static DEVICE_ATTR_RO(pendingq_count);
+
+static ssize_t modalias_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "ap:t%02X\n",
+			 to_ap_dev(dev)->device_type);
+}
+
+static DEVICE_ATTR_RO(modalias);
+
+static ssize_t config_show(struct device *dev,
+			   struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->config ? 1 : 0);
+}
+
+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;
+
+	ap_send_config_uevent(&ac->ap_dev, ac->config);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(config);
+
+static ssize_t chkstop_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", ac->chkstop ? 1 : 0);
+}
+
+static DEVICE_ATTR_RO(chkstop);
+
+static ssize_t max_msg_size_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", ac->maxmsgsize);
+}
+
+static DEVICE_ATTR_RO(max_msg_size);
+
+static struct attribute *ap_card_dev_attrs[] = {
+	&dev_attr_hwtype.attr,
+	&dev_attr_raw_hwtype.attr,
+	&dev_attr_depth.attr,
+	&dev_attr_ap_functions.attr,
+	&dev_attr_request_count.attr,
+	&dev_attr_requestq_count.attr,
+	&dev_attr_pendingq_count.attr,
+	&dev_attr_modalias.attr,
+	&dev_attr_config.attr,
+	&dev_attr_chkstop.attr,
+	&dev_attr_max_msg_size.attr,
+	NULL
+};
+
+static struct attribute_group ap_card_dev_attr_group = {
+	.attrs = ap_card_dev_attrs
+};
+
+static const struct attribute_group *ap_card_dev_attr_groups[] = {
+	&ap_card_dev_attr_group,
+	NULL
+};
+
+static struct device_type ap_card_type = {
+	.name = "ap_card",
+	.groups = ap_card_dev_attr_groups,
+};
+
+static void ap_card_device_release(struct device *dev)
+{
+	struct ap_card *ac = to_ap_card(dev);
+
+	kfree(ac);
+}
+
+struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
+			       int comp_type, unsigned int functions, int ml)
+{
+	struct ap_card *ac;
+
+	ac = kzalloc(sizeof(*ac), GFP_KERNEL);
+	if (!ac)
+		return NULL;
+	ac->ap_dev.device.release = ap_card_device_release;
+	ac->ap_dev.device.type = &ap_card_type;
+	ac->ap_dev.device_type = comp_type;
+	ac->raw_hwtype = raw_type;
+	ac->queue_depth = queue_depth;
+	ac->functions = functions;
+	ac->id = id;
+	ac->maxmsgsize = ml > 0 ?
+		ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
+
+	return ac;
+}