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->raw_hwtype);
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->queue_depth);
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->functions);
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,int queue_depth,int raw_type,int comp_type,unsigned int functions,int ml)232 struct 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(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