ap_card.c

  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 pr_fmt(fmt) "ap: " fmt
 10
 11#include <linux/init.h>
 12#include <linux/slab.h>
 13#include <asm/facility.h>
 14#include <asm/sclp.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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%d\n", ac->hwinfo.at);
 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 sysfs_emit(buf, "%d\n", ac->hwinfo.qd + 1);
 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 sysfs_emit(buf, "0x%08X\n", ac->hwinfo.fac);
 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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 sysfs_emit(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
137}
138
139static DEVICE_ATTR_RO(modalias);
140
141static ssize_t config_show(struct device *dev,
142			   struct device_attribute *attr, char *buf)
143{
144	struct ap_card *ac = to_ap_card(dev);
145
146	return sysfs_emit(buf, "%d\n", ac->config ? 1 : 0);
147}
148
149static ssize_t config_store(struct device *dev,
150			    struct device_attribute *attr,
151			    const char *buf, size_t count)
152{
153	int rc = 0, cfg;
154	struct ap_card *ac = to_ap_card(dev);
155
156	if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
157		return -EINVAL;
158
159	if (cfg && !ac->config)
160		rc = sclp_ap_configure(ac->id);
161	else if (!cfg && ac->config)
162		rc = sclp_ap_deconfigure(ac->id);
163	if (rc)
164		return rc;
165
166	ac->config = cfg ? true : false;
167
168	ap_send_config_uevent(&ac->ap_dev, ac->config);
169
170	return count;
171}
172
173static DEVICE_ATTR_RW(config);
174
175static ssize_t chkstop_show(struct device *dev,
176			    struct device_attribute *attr, char *buf)
177{
178	struct ap_card *ac = to_ap_card(dev);
179
180	return sysfs_emit(buf, "%d\n", ac->chkstop ? 1 : 0);
181}
182
183static DEVICE_ATTR_RO(chkstop);
184
185static ssize_t max_msg_size_show(struct device *dev,
186				 struct device_attribute *attr, char *buf)
187{
188	struct ap_card *ac = to_ap_card(dev);
189
190	return sysfs_emit(buf, "%u\n", ac->maxmsgsize);
191}
192
193static DEVICE_ATTR_RO(max_msg_size);
194
195static struct attribute *ap_card_dev_attrs[] = {
196	&dev_attr_hwtype.attr,
197	&dev_attr_raw_hwtype.attr,
198	&dev_attr_depth.attr,
199	&dev_attr_ap_functions.attr,
200	&dev_attr_request_count.attr,
201	&dev_attr_requestq_count.attr,
202	&dev_attr_pendingq_count.attr,
203	&dev_attr_modalias.attr,
204	&dev_attr_config.attr,
205	&dev_attr_chkstop.attr,
206	&dev_attr_max_msg_size.attr,
207	NULL
208};
209
210static struct attribute_group ap_card_dev_attr_group = {
211	.attrs = ap_card_dev_attrs
212};
213
214static const struct attribute_group *ap_card_dev_attr_groups[] = {
215	&ap_card_dev_attr_group,
216	NULL
217};
218
219static struct device_type ap_card_type = {
220	.name = "ap_card",
221	.groups = ap_card_dev_attr_groups,
222};
223
224static void ap_card_device_release(struct device *dev)
225{
226	struct ap_card *ac = to_ap_card(dev);
227
228	kfree(ac);
229}
230
231struct ap_card *ap_card_create(int id, struct ap_tapq_hwinfo hwinfo,
232			       int comp_type)
233{
234	struct ap_card *ac;
235
236	ac = kzalloc(sizeof(*ac), GFP_KERNEL);
237	if (!ac)
238		return NULL;
239	ac->ap_dev.device.release = ap_card_device_release;
240	ac->ap_dev.device.type = &ap_card_type;
241	ac->ap_dev.device_type = comp_type;
242	ac->hwinfo = hwinfo;
243	ac->id = id;
244	ac->maxmsgsize = hwinfo.ml > 0 ?
245		hwinfo.ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
246
247	return ac;
248}