linux/drivers/s390/crypto/ap_card.c
Harald Freudenberger bc4b295e87 s390/ap: introduce new ap function ap_get_qdev()
Provide a new interface function to be used by the ap drivers:
  struct ap_queue *ap_get_qdev(ap_qid_t qid);
Returns ptr to the struct ap_queue device or NULL if there
was no ap_queue device with this qid found. When something is
found, the reference count of the embedded device is increased.
So the caller has to decrease the reference count after use
with a call to put_device(&aq->ap_dev.device).

With this patch also the ap_card_list is removed from the
ap core code and a new hashtable is introduced which stores
hnodes of all the ap queues known to the ap bus.

The hashtable approach and a first implementation of this
interface comes from a previous patch from
Anthony Krowiak and an idea from Halil Pasic.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Suggested-by: Tony Krowiak <akrowiak@linux.ibm.com>
Suggested-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-05-20 10:22:51 +02:00

192 lines
4.4 KiB
C

// 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 "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 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,
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)
{
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;
return ac;
}