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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Recognize and maintain s390 storage class memory.
4 *
5 * Copyright IBM Corp. 2012
6 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
7 */
8
9#include <linux/device.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/err.h>
15#include <asm/eadm.h>
16#include "chsc.h"
17
18static struct device *scm_root;
19
20#define to_scm_dev(n) container_of(n, struct scm_device, dev)
21#define to_scm_drv(d) container_of(d, struct scm_driver, drv)
22
23static int scmdev_probe(struct device *dev)
24{
25 struct scm_device *scmdev = to_scm_dev(dev);
26 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
27
28 return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV;
29}
30
31static void scmdev_remove(struct device *dev)
32{
33 struct scm_device *scmdev = to_scm_dev(dev);
34 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
35
36 if (scmdrv->remove)
37 scmdrv->remove(scmdev);
38}
39
40static int scmdev_uevent(const struct device *dev, struct kobj_uevent_env *env)
41{
42 return add_uevent_var(env, "MODALIAS=scm:scmdev");
43}
44
45static struct bus_type scm_bus_type = {
46 .name = "scm",
47 .probe = scmdev_probe,
48 .remove = scmdev_remove,
49 .uevent = scmdev_uevent,
50};
51
52/**
53 * scm_driver_register() - register a scm driver
54 * @scmdrv: driver to be registered
55 */
56int scm_driver_register(struct scm_driver *scmdrv)
57{
58 struct device_driver *drv = &scmdrv->drv;
59
60 drv->bus = &scm_bus_type;
61
62 return driver_register(drv);
63}
64EXPORT_SYMBOL_GPL(scm_driver_register);
65
66/**
67 * scm_driver_unregister() - deregister a scm driver
68 * @scmdrv: driver to be deregistered
69 */
70void scm_driver_unregister(struct scm_driver *scmdrv)
71{
72 driver_unregister(&scmdrv->drv);
73}
74EXPORT_SYMBOL_GPL(scm_driver_unregister);
75
76void scm_irq_handler(struct aob *aob, blk_status_t error)
77{
78 struct aob_rq_header *aobrq = (void *) aob->request.data;
79 struct scm_device *scmdev = aobrq->scmdev;
80 struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);
81
82 scmdrv->handler(scmdev, aobrq->data, error);
83}
84EXPORT_SYMBOL_GPL(scm_irq_handler);
85
86#define scm_attr(name) \
87static ssize_t show_##name(struct device *dev, \
88 struct device_attribute *attr, char *buf) \
89{ \
90 struct scm_device *scmdev = to_scm_dev(dev); \
91 int ret; \
92 \
93 device_lock(dev); \
94 ret = sprintf(buf, "%u\n", scmdev->attrs.name); \
95 device_unlock(dev); \
96 \
97 return ret; \
98} \
99static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
100
101scm_attr(persistence);
102scm_attr(oper_state);
103scm_attr(data_state);
104scm_attr(rank);
105scm_attr(release);
106scm_attr(res_id);
107
108static struct attribute *scmdev_attrs[] = {
109 &dev_attr_persistence.attr,
110 &dev_attr_oper_state.attr,
111 &dev_attr_data_state.attr,
112 &dev_attr_rank.attr,
113 &dev_attr_release.attr,
114 &dev_attr_res_id.attr,
115 NULL,
116};
117
118static struct attribute_group scmdev_attr_group = {
119 .attrs = scmdev_attrs,
120};
121
122static const struct attribute_group *scmdev_attr_groups[] = {
123 &scmdev_attr_group,
124 NULL,
125};
126
127static void scmdev_release(struct device *dev)
128{
129 struct scm_device *scmdev = to_scm_dev(dev);
130
131 kfree(scmdev);
132}
133
134static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
135 unsigned int size, unsigned int max_blk_count)
136{
137 dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
138 scmdev->nr_max_block = max_blk_count;
139 scmdev->address = sale->sa;
140 scmdev->size = 1UL << size;
141 scmdev->attrs.rank = sale->rank;
142 scmdev->attrs.persistence = sale->p;
143 scmdev->attrs.oper_state = sale->op_state;
144 scmdev->attrs.data_state = sale->data_state;
145 scmdev->attrs.rank = sale->rank;
146 scmdev->attrs.release = sale->r;
147 scmdev->attrs.res_id = sale->rid;
148 scmdev->dev.parent = scm_root;
149 scmdev->dev.bus = &scm_bus_type;
150 scmdev->dev.release = scmdev_release;
151 scmdev->dev.groups = scmdev_attr_groups;
152}
153
154/*
155 * Check for state-changes, notify the driver and userspace.
156 */
157static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
158{
159 struct scm_driver *scmdrv;
160 bool changed;
161
162 device_lock(&scmdev->dev);
163 changed = scmdev->attrs.rank != sale->rank ||
164 scmdev->attrs.oper_state != sale->op_state;
165 scmdev->attrs.rank = sale->rank;
166 scmdev->attrs.oper_state = sale->op_state;
167 if (!scmdev->dev.driver)
168 goto out;
169 scmdrv = to_scm_drv(scmdev->dev.driver);
170 if (changed && scmdrv->notify)
171 scmdrv->notify(scmdev, SCM_CHANGE);
172out:
173 device_unlock(&scmdev->dev);
174 if (changed)
175 kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
176}
177
178static int check_address(struct device *dev, const void *data)
179{
180 struct scm_device *scmdev = to_scm_dev(dev);
181 const struct sale *sale = data;
182
183 return scmdev->address == sale->sa;
184}
185
186static struct scm_device *scmdev_find(struct sale *sale)
187{
188 struct device *dev;
189
190 dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);
191
192 return dev ? to_scm_dev(dev) : NULL;
193}
194
195static int scm_add(struct chsc_scm_info *scm_info, size_t num)
196{
197 struct sale *sale, *scmal = scm_info->scmal;
198 struct scm_device *scmdev;
199 int ret;
200
201 for (sale = scmal; sale < scmal + num; sale++) {
202 scmdev = scmdev_find(sale);
203 if (scmdev) {
204 scmdev_update(scmdev, sale);
205 /* Release reference from scm_find(). */
206 put_device(&scmdev->dev);
207 continue;
208 }
209 scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
210 if (!scmdev)
211 return -ENODEV;
212 scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
213 ret = device_register(&scmdev->dev);
214 if (ret) {
215 /* Release reference from device_initialize(). */
216 put_device(&scmdev->dev);
217 return ret;
218 }
219 }
220
221 return 0;
222}
223
224int scm_update_information(void)
225{
226 struct chsc_scm_info *scm_info;
227 u64 token = 0;
228 size_t num;
229 int ret;
230
231 scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
232 if (!scm_info)
233 return -ENOMEM;
234
235 do {
236 ret = chsc_scm_info(scm_info, token);
237 if (ret)
238 break;
239
240 num = (scm_info->response.length -
241 (offsetof(struct chsc_scm_info, scmal) -
242 offsetof(struct chsc_scm_info, response))
243 ) / sizeof(struct sale);
244
245 ret = scm_add(scm_info, num);
246 if (ret)
247 break;
248
249 token = scm_info->restok;
250 } while (token);
251
252 free_page((unsigned long)scm_info);
253
254 return ret;
255}
256
257static int scm_dev_avail(struct device *dev, void *unused)
258{
259 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
260 struct scm_device *scmdev = to_scm_dev(dev);
261
262 if (dev->driver && scmdrv->notify)
263 scmdrv->notify(scmdev, SCM_AVAIL);
264
265 return 0;
266}
267
268int scm_process_availability_information(void)
269{
270 return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
271}
272
273static int __init scm_init(void)
274{
275 int ret;
276
277 ret = bus_register(&scm_bus_type);
278 if (ret)
279 return ret;
280
281 scm_root = root_device_register("scm");
282 if (IS_ERR(scm_root)) {
283 bus_unregister(&scm_bus_type);
284 return PTR_ERR(scm_root);
285 }
286
287 scm_update_information();
288 return 0;
289}
290subsys_initcall_sync(scm_init);
1/*
2 * Recognize and maintain s390 storage class memory.
3 *
4 * Copyright IBM Corp. 2012
5 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
6 */
7
8#include <linux/device.h>
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/slab.h>
12#include <linux/init.h>
13#include <linux/err.h>
14#include <asm/eadm.h>
15#include "chsc.h"
16
17static struct device *scm_root;
18
19#define to_scm_dev(n) container_of(n, struct scm_device, dev)
20#define to_scm_drv(d) container_of(d, struct scm_driver, drv)
21
22static int scmdev_probe(struct device *dev)
23{
24 struct scm_device *scmdev = to_scm_dev(dev);
25 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
26
27 return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV;
28}
29
30static int scmdev_remove(struct device *dev)
31{
32 struct scm_device *scmdev = to_scm_dev(dev);
33 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
34
35 return scmdrv->remove ? scmdrv->remove(scmdev) : -ENODEV;
36}
37
38static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
39{
40 return add_uevent_var(env, "MODALIAS=scm:scmdev");
41}
42
43static struct bus_type scm_bus_type = {
44 .name = "scm",
45 .probe = scmdev_probe,
46 .remove = scmdev_remove,
47 .uevent = scmdev_uevent,
48};
49
50/**
51 * scm_driver_register() - register a scm driver
52 * @scmdrv: driver to be registered
53 */
54int scm_driver_register(struct scm_driver *scmdrv)
55{
56 struct device_driver *drv = &scmdrv->drv;
57
58 drv->bus = &scm_bus_type;
59
60 return driver_register(drv);
61}
62EXPORT_SYMBOL_GPL(scm_driver_register);
63
64/**
65 * scm_driver_unregister() - deregister a scm driver
66 * @scmdrv: driver to be deregistered
67 */
68void scm_driver_unregister(struct scm_driver *scmdrv)
69{
70 driver_unregister(&scmdrv->drv);
71}
72EXPORT_SYMBOL_GPL(scm_driver_unregister);
73
74void scm_irq_handler(struct aob *aob, int error)
75{
76 struct aob_rq_header *aobrq = (void *) aob->request.data;
77 struct scm_device *scmdev = aobrq->scmdev;
78 struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);
79
80 scmdrv->handler(scmdev, aobrq->data, error);
81}
82EXPORT_SYMBOL_GPL(scm_irq_handler);
83
84#define scm_attr(name) \
85static ssize_t show_##name(struct device *dev, \
86 struct device_attribute *attr, char *buf) \
87{ \
88 struct scm_device *scmdev = to_scm_dev(dev); \
89 int ret; \
90 \
91 device_lock(dev); \
92 ret = sprintf(buf, "%u\n", scmdev->attrs.name); \
93 device_unlock(dev); \
94 \
95 return ret; \
96} \
97static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
98
99scm_attr(persistence);
100scm_attr(oper_state);
101scm_attr(data_state);
102scm_attr(rank);
103scm_attr(release);
104scm_attr(res_id);
105
106static struct attribute *scmdev_attrs[] = {
107 &dev_attr_persistence.attr,
108 &dev_attr_oper_state.attr,
109 &dev_attr_data_state.attr,
110 &dev_attr_rank.attr,
111 &dev_attr_release.attr,
112 &dev_attr_res_id.attr,
113 NULL,
114};
115
116static struct attribute_group scmdev_attr_group = {
117 .attrs = scmdev_attrs,
118};
119
120static const struct attribute_group *scmdev_attr_groups[] = {
121 &scmdev_attr_group,
122 NULL,
123};
124
125static void scmdev_release(struct device *dev)
126{
127 struct scm_device *scmdev = to_scm_dev(dev);
128
129 kfree(scmdev);
130}
131
132static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
133 unsigned int size, unsigned int max_blk_count)
134{
135 dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
136 scmdev->nr_max_block = max_blk_count;
137 scmdev->address = sale->sa;
138 scmdev->size = 1UL << size;
139 scmdev->attrs.rank = sale->rank;
140 scmdev->attrs.persistence = sale->p;
141 scmdev->attrs.oper_state = sale->op_state;
142 scmdev->attrs.data_state = sale->data_state;
143 scmdev->attrs.rank = sale->rank;
144 scmdev->attrs.release = sale->r;
145 scmdev->attrs.res_id = sale->rid;
146 scmdev->dev.parent = scm_root;
147 scmdev->dev.bus = &scm_bus_type;
148 scmdev->dev.release = scmdev_release;
149 scmdev->dev.groups = scmdev_attr_groups;
150}
151
152/*
153 * Check for state-changes, notify the driver and userspace.
154 */
155static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
156{
157 struct scm_driver *scmdrv;
158 bool changed;
159
160 device_lock(&scmdev->dev);
161 changed = scmdev->attrs.rank != sale->rank ||
162 scmdev->attrs.oper_state != sale->op_state;
163 scmdev->attrs.rank = sale->rank;
164 scmdev->attrs.oper_state = sale->op_state;
165 if (!scmdev->dev.driver)
166 goto out;
167 scmdrv = to_scm_drv(scmdev->dev.driver);
168 if (changed && scmdrv->notify)
169 scmdrv->notify(scmdev, SCM_CHANGE);
170out:
171 device_unlock(&scmdev->dev);
172 if (changed)
173 kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
174}
175
176static int check_address(struct device *dev, void *data)
177{
178 struct scm_device *scmdev = to_scm_dev(dev);
179 struct sale *sale = data;
180
181 return scmdev->address == sale->sa;
182}
183
184static struct scm_device *scmdev_find(struct sale *sale)
185{
186 struct device *dev;
187
188 dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);
189
190 return dev ? to_scm_dev(dev) : NULL;
191}
192
193static int scm_add(struct chsc_scm_info *scm_info, size_t num)
194{
195 struct sale *sale, *scmal = scm_info->scmal;
196 struct scm_device *scmdev;
197 int ret;
198
199 for (sale = scmal; sale < scmal + num; sale++) {
200 scmdev = scmdev_find(sale);
201 if (scmdev) {
202 scmdev_update(scmdev, sale);
203 /* Release reference from scm_find(). */
204 put_device(&scmdev->dev);
205 continue;
206 }
207 scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
208 if (!scmdev)
209 return -ENODEV;
210 scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
211 ret = device_register(&scmdev->dev);
212 if (ret) {
213 /* Release reference from device_initialize(). */
214 put_device(&scmdev->dev);
215 return ret;
216 }
217 }
218
219 return 0;
220}
221
222int scm_update_information(void)
223{
224 struct chsc_scm_info *scm_info;
225 u64 token = 0;
226 size_t num;
227 int ret;
228
229 scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
230 if (!scm_info)
231 return -ENOMEM;
232
233 do {
234 ret = chsc_scm_info(scm_info, token);
235 if (ret)
236 break;
237
238 num = (scm_info->response.length -
239 (offsetof(struct chsc_scm_info, scmal) -
240 offsetof(struct chsc_scm_info, response))
241 ) / sizeof(struct sale);
242
243 ret = scm_add(scm_info, num);
244 if (ret)
245 break;
246
247 token = scm_info->restok;
248 } while (token);
249
250 free_page((unsigned long)scm_info);
251
252 return ret;
253}
254
255static int scm_dev_avail(struct device *dev, void *unused)
256{
257 struct scm_driver *scmdrv = to_scm_drv(dev->driver);
258 struct scm_device *scmdev = to_scm_dev(dev);
259
260 if (dev->driver && scmdrv->notify)
261 scmdrv->notify(scmdev, SCM_AVAIL);
262
263 return 0;
264}
265
266int scm_process_availability_information(void)
267{
268 return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
269}
270
271static int __init scm_init(void)
272{
273 int ret;
274
275 ret = bus_register(&scm_bus_type);
276 if (ret)
277 return ret;
278
279 scm_root = root_device_register("scm");
280 if (IS_ERR(scm_root)) {
281 bus_unregister(&scm_bus_type);
282 return PTR_ERR(scm_root);
283 }
284
285 scm_update_information();
286 return 0;
287}
288subsys_initcall_sync(scm_init);