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#include <asm/sclp.h>
16
17#include "ap_bus.h"
18
19/*
20 * AP card related attributes.
21 */
22static ssize_t hwtype_show(struct device *dev,
23 struct device_attribute *attr, char *buf)
24{
25 struct ap_card *ac = to_ap_card(dev);
26
27 return sysfs_emit(buf, fmt: "%d\n", ac->ap_dev.device_type);
28}
29
30static DEVICE_ATTR_RO(hwtype);
31
32static ssize_t raw_hwtype_show(struct device *dev,
33 struct device_attribute *attr, char *buf)
34{
35 struct ap_card *ac = to_ap_card(dev);
36
37 return sysfs_emit(buf, fmt: "%d\n", ac->raw_hwtype);
38}
39
40static DEVICE_ATTR_RO(raw_hwtype);
41
42static ssize_t depth_show(struct device *dev, struct device_attribute *attr,
43 char *buf)
44{
45 struct ap_card *ac = to_ap_card(dev);
46
47 return sysfs_emit(buf, fmt: "%d\n", ac->queue_depth);
48}
49
50static DEVICE_ATTR_RO(depth);
51
52static ssize_t ap_functions_show(struct device *dev,
53 struct device_attribute *attr, char *buf)
54{
55 struct ap_card *ac = to_ap_card(dev);
56
57 return sysfs_emit(buf, fmt: "0x%08X\n", ac->functions);
58}
59
60static DEVICE_ATTR_RO(ap_functions);
61
62static ssize_t request_count_show(struct device *dev,
63 struct device_attribute *attr,
64 char *buf)
65{
66 struct ap_card *ac = to_ap_card(dev);
67 u64 req_cnt;
68
69 req_cnt = 0;
70 spin_lock_bh(lock: &ap_queues_lock);
71 req_cnt = atomic64_read(v: &ac->total_request_count);
72 spin_unlock_bh(lock: &ap_queues_lock);
73 return sysfs_emit(buf, fmt: "%llu\n", req_cnt);
74}
75
76static ssize_t request_count_store(struct device *dev,
77 struct device_attribute *attr,
78 const char *buf, size_t count)
79{
80 int bkt;
81 struct ap_queue *aq;
82 struct ap_card *ac = to_ap_card(dev);
83
84 spin_lock_bh(lock: &ap_queues_lock);
85 hash_for_each(ap_queues, bkt, aq, hnode)
86 if (ac == aq->card)
87 aq->total_request_count = 0;
88 spin_unlock_bh(lock: &ap_queues_lock);
89 atomic64_set(v: &ac->total_request_count, i: 0);
90
91 return count;
92}
93
94static DEVICE_ATTR_RW(request_count);
95
96static ssize_t requestq_count_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
98{
99 int bkt;
100 struct ap_queue *aq;
101 unsigned int reqq_cnt;
102 struct ap_card *ac = to_ap_card(dev);
103
104 reqq_cnt = 0;
105 spin_lock_bh(lock: &ap_queues_lock);
106 hash_for_each(ap_queues, bkt, aq, hnode)
107 if (ac == aq->card)
108 reqq_cnt += aq->requestq_count;
109 spin_unlock_bh(lock: &ap_queues_lock);
110 return sysfs_emit(buf, fmt: "%d\n", reqq_cnt);
111}
112
113static DEVICE_ATTR_RO(requestq_count);
114
115static ssize_t pendingq_count_show(struct device *dev,
116 struct device_attribute *attr, char *buf)
117{
118 int bkt;
119 struct ap_queue *aq;
120 unsigned int penq_cnt;
121 struct ap_card *ac = to_ap_card(dev);
122
123 penq_cnt = 0;
124 spin_lock_bh(lock: &ap_queues_lock);
125 hash_for_each(ap_queues, bkt, aq, hnode)
126 if (ac == aq->card)
127 penq_cnt += aq->pendingq_count;
128 spin_unlock_bh(lock: &ap_queues_lock);
129 return sysfs_emit(buf, fmt: "%d\n", penq_cnt);
130}
131
132static DEVICE_ATTR_RO(pendingq_count);
133
134static ssize_t modalias_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
136{
137 return sysfs_emit(buf, fmt: "ap:t%02X\n", to_ap_dev(dev)->device_type);
138}
139
140static DEVICE_ATTR_RO(modalias);
141
142static ssize_t config_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
144{
145 struct ap_card *ac = to_ap_card(dev);
146
147 return sysfs_emit(buf, fmt: "%d\n", ac->config ? 1 : 0);
148}
149
150static ssize_t config_store(struct device *dev,
151 struct device_attribute *attr,
152 const char *buf, size_t count)
153{
154 int rc = 0, cfg;
155 struct ap_card *ac = to_ap_card(dev);
156
157 if (sscanf(buf, "%d\n", &cfg) != 1 || cfg < 0 || cfg > 1)
158 return -EINVAL;
159
160 if (cfg && !ac->config)
161 rc = sclp_ap_configure(ac->id);
162 else if (!cfg && ac->config)
163 rc = sclp_ap_deconfigure(ac->id);
164 if (rc)
165 return rc;
166
167 ac->config = cfg ? true : false;
168
169 ap_send_config_uevent(ap_dev: &ac->ap_dev, cfg: ac->config);
170
171 return count;
172}
173
174static DEVICE_ATTR_RW(config);
175
176static ssize_t chkstop_show(struct device *dev,
177 struct device_attribute *attr, char *buf)
178{
179 struct ap_card *ac = to_ap_card(dev);
180
181 return sysfs_emit(buf, fmt: "%d\n", ac->chkstop ? 1 : 0);
182}
183
184static DEVICE_ATTR_RO(chkstop);
185
186static ssize_t max_msg_size_show(struct device *dev,
187 struct device_attribute *attr, char *buf)
188{
189 struct ap_card *ac = to_ap_card(dev);
190
191 return sysfs_emit(buf, fmt: "%u\n", ac->maxmsgsize);
192}
193
194static DEVICE_ATTR_RO(max_msg_size);
195
196static struct attribute *ap_card_dev_attrs[] = {
197 &dev_attr_hwtype.attr,
198 &dev_attr_raw_hwtype.attr,
199 &dev_attr_depth.attr,
200 &dev_attr_ap_functions.attr,
201 &dev_attr_request_count.attr,
202 &dev_attr_requestq_count.attr,
203 &dev_attr_pendingq_count.attr,
204 &dev_attr_modalias.attr,
205 &dev_attr_config.attr,
206 &dev_attr_chkstop.attr,
207 &dev_attr_max_msg_size.attr,
208 NULL
209};
210
211static struct attribute_group ap_card_dev_attr_group = {
212 .attrs = ap_card_dev_attrs
213};
214
215static const struct attribute_group *ap_card_dev_attr_groups[] = {
216 &ap_card_dev_attr_group,
217 NULL
218};
219
220static struct device_type ap_card_type = {
221 .name = "ap_card",
222 .groups = ap_card_dev_attr_groups,
223};
224
225static void ap_card_device_release(struct device *dev)
226{
227 struct ap_card *ac = to_ap_card(dev);
228
229 kfree(objp: ac);
230}
231
232struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
233 int comp_type, unsigned int functions, int ml)
234{
235 struct ap_card *ac;
236
237 ac = kzalloc(size: sizeof(*ac), GFP_KERNEL);
238 if (!ac)
239 return NULL;
240 ac->ap_dev.device.release = ap_card_device_release;
241 ac->ap_dev.device.type = &ap_card_type;
242 ac->ap_dev.device_type = comp_type;
243 ac->raw_hwtype = raw_type;
244 ac->queue_depth = queue_depth;
245 ac->functions = functions;
246 ac->id = id;
247 ac->maxmsgsize = ml > 0 ?
248 ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
249
250 return ac;
251}
252

source code of linux/drivers/s390/crypto/ap_card.c