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// 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 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_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;
}
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