drivers/s390/crypto/ap_card.c

Source file repositories/reference/linux-study-clean/drivers/s390/crypto/ap_card.c

File Facts

System
Linux kernel
Corpus path
drivers/s390/crypto/ap_card.c
Extension
.c
Size
5660 bytes
Lines
249
Domain
Driver Families
Bucket
drivers/s390
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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 pr_fmt(fmt) "ap: " 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%d\n", ac->hwinfo.at);
}

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 sysfs_emit(buf, "%d\n", ac->hwinfo.qd + 1);
}

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 sysfs_emit(buf, "0x%08X\n", ac->hwinfo.fac);
}

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 sysfs_emit(buf, "%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;

Annotation

Implementation Notes