1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright IBM Corp. 2016
  4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
  5 *
  6 * Adjunct processor bus, card related code.
  7 */
  8
  9#define KMSG_COMPONENT "ap"
 10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 11
 12#include <linux/init.h>
 13#include <linux/slab.h>
 14#include <asm/facility.h>
 15
 16#include "ap_bus.h"
 17
 18/*
 19 * AP card related attributes.
 20 */
 21static ssize_t hwtype_show(struct device *dev,
 22			   struct device_attribute *attr, char *buf)
 23{
 24	struct ap_card *ac = to_ap_card(dev);
 25
 26	return snprintf(buf, PAGE_SIZE, "%d\n", ac->ap_dev.device_type);
 27}
 28
 29static DEVICE_ATTR_RO(hwtype);
 30
 31static ssize_t raw_hwtype_show(struct device *dev,
 32			       struct device_attribute *attr, char *buf)
 33{
 34	struct ap_card *ac = to_ap_card(dev);
 35
 36	return snprintf(buf, PAGE_SIZE, "%d\n", ac->raw_hwtype);
 37}
 38
 39static DEVICE_ATTR_RO(raw_hwtype);
 40
 41static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
 42			  char *buf)
 43{
 44	struct ap_card *ac = to_ap_card(dev);
 45
 46	return snprintf(buf, PAGE_SIZE, "%d\n", ac->queue_depth);
 47}
 48
 49static DEVICE_ATTR_RO(depth);
 50
 51static ssize_t ap_functions_show(struct device *dev,
 52				 struct device_attribute *attr, char *buf)
 53{
 54	struct ap_card *ac = to_ap_card(dev);
 55
 56	return snprintf(buf, PAGE_SIZE, "0x%08X\n", ac->functions);
 57}
 58
 59static DEVICE_ATTR_RO(ap_functions);
 60
 61static ssize_t request_count_show(struct device *dev,
 62				  struct device_attribute *attr,
 63				  char *buf)
 64{
 65	struct ap_card *ac = to_ap_card(dev);
 66	unsigned int req_cnt;
 67
 68	req_cnt = 0;
 69	spin_lock_bh(&ap_list_lock);
 70	req_cnt = atomic_read(&ac->total_request_count);
 71	spin_unlock_bh(&ap_list_lock);
 72	return snprintf(buf, PAGE_SIZE, "%d\n", req_cnt);
 73}
 74
 75static ssize_t request_count_store(struct device *dev,
 76				   struct device_attribute *attr,
 77				   const char *buf, size_t count)
 78{
 79	struct ap_card *ac = to_ap_card(dev);
 80	struct ap_queue *aq;
 81
 82	spin_lock_bh(&ap_list_lock);
 83	for_each_ap_queue(aq, ac)
 84		aq->total_request_count = 0;
 85	spin_unlock_bh(&ap_list_lock);
 86	atomic_set(&ac->total_request_count, 0);
 87
 88	return count;
 89}
 90
 91static DEVICE_ATTR_RW(request_count);
 92
 93static ssize_t requestq_count_show(struct device *dev,
 94				   struct device_attribute *attr, char *buf)
 95{
 96	struct ap_card *ac = to_ap_card(dev);
 97	struct ap_queue *aq;
 98	unsigned int reqq_cnt;
 99
100	reqq_cnt = 0;
101	spin_lock_bh(&ap_list_lock);
102	for_each_ap_queue(aq, ac)
103		reqq_cnt += aq->requestq_count;
104	spin_unlock_bh(&ap_list_lock);
105	return snprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
106}
107
108static DEVICE_ATTR_RO(requestq_count);
109
110static ssize_t pendingq_count_show(struct device *dev,
111				   struct device_attribute *attr, char *buf)
112{
113	struct ap_card *ac = to_ap_card(dev);
114	struct ap_queue *aq;
115	unsigned int penq_cnt;
116
117	penq_cnt = 0;
118	spin_lock_bh(&ap_list_lock);
119	for_each_ap_queue(aq, ac)
120		penq_cnt += aq->pendingq_count;
121	spin_unlock_bh(&ap_list_lock);
122	return snprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
123}
124
125static DEVICE_ATTR_RO(pendingq_count);
126
127static ssize_t modalias_show(struct device *dev,
128			     struct device_attribute *attr, char *buf)
129{
130	return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
131}
132
133static DEVICE_ATTR_RO(modalias);
134
135static struct attribute *ap_card_dev_attrs[] = {
136	&dev_attr_hwtype.attr,
137	&dev_attr_raw_hwtype.attr,
138	&dev_attr_depth.attr,
139	&dev_attr_ap_functions.attr,
140	&dev_attr_request_count.attr,
141	&dev_attr_requestq_count.attr,
142	&dev_attr_pendingq_count.attr,
143	&dev_attr_modalias.attr,
144	NULL
145};
146
147static struct attribute_group ap_card_dev_attr_group = {
148	.attrs = ap_card_dev_attrs
149};
150
151static const struct attribute_group *ap_card_dev_attr_groups[] = {
152	&ap_card_dev_attr_group,
153	NULL
154};
155
156static struct device_type ap_card_type = {
157	.name = "ap_card",
158	.groups = ap_card_dev_attr_groups,
159};
160
161static void ap_card_device_release(struct device *dev)
162{
163	struct ap_card *ac = to_ap_card(dev);
164
165	if (!list_empty(&ac->list)) {
166		spin_lock_bh(&ap_list_lock);
167		list_del_init(&ac->list);
168		spin_unlock_bh(&ap_list_lock);
169	}
170	kfree(ac);
171}
172
173struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
174			       int comp_type, unsigned int functions)
175{
176	struct ap_card *ac;
177
178	ac = kzalloc(sizeof(*ac), GFP_KERNEL);
179	if (!ac)
180		return NULL;
181	INIT_LIST_HEAD(&ac->list);
182	INIT_LIST_HEAD(&ac->queues);
183	ac->ap_dev.device.release = ap_card_device_release;
184	ac->ap_dev.device.type = &ap_card_type;
185	ac->ap_dev.device_type = comp_type;
186	ac->raw_hwtype = raw_type;
187	ac->queue_depth = queue_depth;
188	ac->functions = functions;
189	ac->id = id;
190	return ac;
191}