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 scnprintf(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 scnprintf(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 scnprintf(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 scnprintf(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	u64 req_cnt;
 67
 68	req_cnt = 0;
 69	spin_lock_bh(&ap_queues_lock);
 70	req_cnt = atomic64_read(&ac->total_request_count);
 71	spin_unlock_bh(&ap_queues_lock);
 72	return scnprintf(buf, PAGE_SIZE, "%llu\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	int bkt;
 80	struct ap_queue *aq;
 81	struct ap_card *ac = to_ap_card(dev);
 82
 83	spin_lock_bh(&ap_queues_lock);
 84	hash_for_each(ap_queues, bkt, aq, hnode)
 85		if (ac == aq->card)
 86			aq->total_request_count = 0;
 87	spin_unlock_bh(&ap_queues_lock);
 88	atomic64_set(&ac->total_request_count, 0);
 89
 90	return count;
 91}
 92
 93static DEVICE_ATTR_RW(request_count);
 94
 95static ssize_t requestq_count_show(struct device *dev,
 96				   struct device_attribute *attr, char *buf)
 97{
 98	int bkt;
 99	struct ap_queue *aq;
100	unsigned int reqq_cnt;
101	struct ap_card *ac = to_ap_card(dev);
102
103	reqq_cnt = 0;
104	spin_lock_bh(&ap_queues_lock);
105	hash_for_each(ap_queues, bkt, aq, hnode)
106		if (ac == aq->card)
107			reqq_cnt += aq->requestq_count;
108	spin_unlock_bh(&ap_queues_lock);
109	return scnprintf(buf, PAGE_SIZE, "%d\n", reqq_cnt);
110}
111
112static DEVICE_ATTR_RO(requestq_count);
113
114static ssize_t pendingq_count_show(struct device *dev,
115				   struct device_attribute *attr, char *buf)
116{
117	int bkt;
118	struct ap_queue *aq;
119	unsigned int penq_cnt;
120	struct ap_card *ac = to_ap_card(dev);
121
122	penq_cnt = 0;
123	spin_lock_bh(&ap_queues_lock);
124	hash_for_each(ap_queues, bkt, aq, hnode)
125		if (ac == aq->card)
126			penq_cnt += aq->pendingq_count;
127	spin_unlock_bh(&ap_queues_lock);
128	return scnprintf(buf, PAGE_SIZE, "%d\n", penq_cnt);
129}
130
131static DEVICE_ATTR_RO(pendingq_count);
132
133static ssize_t modalias_show(struct device *dev,
134			     struct device_attribute *attr, char *buf)
135{
136	return scnprintf(buf, PAGE_SIZE, "ap:t%02X\n",
137			 to_ap_dev(dev)->device_type);
138}
139
140static DEVICE_ATTR_RO(modalias);
141
142static struct attribute *ap_card_dev_attrs[] = {
143	&dev_attr_hwtype.attr,
144	&dev_attr_raw_hwtype.attr,
145	&dev_attr_depth.attr,
146	&dev_attr_ap_functions.attr,
147	&dev_attr_request_count.attr,
148	&dev_attr_requestq_count.attr,
149	&dev_attr_pendingq_count.attr,
150	&dev_attr_modalias.attr,
151	NULL
152};
153
154static struct attribute_group ap_card_dev_attr_group = {
155	.attrs = ap_card_dev_attrs
156};
157
158static const struct attribute_group *ap_card_dev_attr_groups[] = {
159	&ap_card_dev_attr_group,
160	NULL
161};
162
163static struct device_type ap_card_type = {
164	.name = "ap_card",
165	.groups = ap_card_dev_attr_groups,
166};
167
168static void ap_card_device_release(struct device *dev)
169{
170	struct ap_card *ac = to_ap_card(dev);
171
172	kfree(ac);
173}
174
175struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
176			       int comp_type, unsigned int functions)
177{
178	struct ap_card *ac;
179
180	ac = kzalloc(sizeof(*ac), GFP_KERNEL);
181	if (!ac)
182		return NULL;
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}