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 */
hwtype_show(struct device * dev,struct device_attribute * attr,char * buf)22 static 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, "%d\n", ac->ap_dev.device_type);
28 }
29
30 static DEVICE_ATTR_RO(hwtype);
31
raw_hwtype_show(struct device * dev,struct device_attribute * attr,char * buf)32 static 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, "%d\n", ac->hwinfo.at);
38 }
39
40 static DEVICE_ATTR_RO(raw_hwtype);
41
depth_show(struct device * dev,struct device_attribute * attr,char * buf)42 static 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, "%d\n", ac->hwinfo.qd);
48 }
49
50 static DEVICE_ATTR_RO(depth);
51
ap_functions_show(struct device * dev,struct device_attribute * attr,char * buf)52 static 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, "0x%08X\n", ac->hwinfo.fac);
58 }
59
60 static DEVICE_ATTR_RO(ap_functions);
61
request_count_show(struct device * dev,struct device_attribute * attr,char * buf)62 static 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(&ap_queues_lock);
71 req_cnt = atomic64_read(&ac->total_request_count);
72 spin_unlock_bh(&ap_queues_lock);
73 return sysfs_emit(buf, "%llu\n", req_cnt);
74 }
75
request_count_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)76 static 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(&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(&ap_queues_lock);
89 atomic64_set(&ac->total_request_count, 0);
90
91 return count;
92 }
93
94 static DEVICE_ATTR_RW(request_count);
95
requestq_count_show(struct device * dev,struct device_attribute * attr,char * buf)96 static 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(&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(&ap_queues_lock);
110 return sysfs_emit(buf, "%d\n", reqq_cnt);
111 }
112
113 static DEVICE_ATTR_RO(requestq_count);
114
pendingq_count_show(struct device * dev,struct device_attribute * attr,char * buf)115 static 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(&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(&ap_queues_lock);
129 return sysfs_emit(buf, "%d\n", penq_cnt);
130 }
131
132 static DEVICE_ATTR_RO(pendingq_count);
133
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)134 static ssize_t modalias_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
136 {
137 return sysfs_emit(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
138 }
139
140 static DEVICE_ATTR_RO(modalias);
141
config_show(struct device * dev,struct device_attribute * attr,char * buf)142 static 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, "%d\n", ac->config ? 1 : 0);
148 }
149
config_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)150 static 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(&ac->ap_dev, ac->config);
170
171 return count;
172 }
173
174 static DEVICE_ATTR_RW(config);
175
chkstop_show(struct device * dev,struct device_attribute * attr,char * buf)176 static 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, "%d\n", ac->chkstop ? 1 : 0);
182 }
183
184 static DEVICE_ATTR_RO(chkstop);
185
max_msg_size_show(struct device * dev,struct device_attribute * attr,char * buf)186 static 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, "%u\n", ac->maxmsgsize);
192 }
193
194 static DEVICE_ATTR_RO(max_msg_size);
195
196 static 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
211 static struct attribute_group ap_card_dev_attr_group = {
212 .attrs = ap_card_dev_attrs
213 };
214
215 static const struct attribute_group *ap_card_dev_attr_groups[] = {
216 &ap_card_dev_attr_group,
217 NULL
218 };
219
220 static struct device_type ap_card_type = {
221 .name = "ap_card",
222 .groups = ap_card_dev_attr_groups,
223 };
224
ap_card_device_release(struct device * dev)225 static void ap_card_device_release(struct device *dev)
226 {
227 struct ap_card *ac = to_ap_card(dev);
228
229 kfree(ac);
230 }
231
ap_card_create(int id,struct ap_tapq_hwinfo hwinfo,int comp_type)232 struct ap_card *ap_card_create(int id, struct ap_tapq_hwinfo hwinfo,
233 int comp_type)
234 {
235 struct ap_card *ac;
236
237 ac = kzalloc(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->hwinfo = hwinfo;
244 ac->id = id;
245 ac->maxmsgsize = hwinfo.ml > 0 ?
246 hwinfo.ml * AP_TAPQ_ML_FIELD_CHUNK_SIZE : AP_DEFAULT_MAX_MSG_SIZE;
247
248 return ac;
249 }
250