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v6.8
  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);
v5.4
  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 int 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	return scmdrv->remove ? scmdrv->remove(scmdev) : -ENODEV;
 
 37}
 38
 39static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
 40{
 41	return add_uevent_var(env, "MODALIAS=scm:scmdev");
 42}
 43
 44static struct bus_type scm_bus_type = {
 45	.name  = "scm",
 46	.probe = scmdev_probe,
 47	.remove = scmdev_remove,
 48	.uevent = scmdev_uevent,
 49};
 50
 51/**
 52 * scm_driver_register() - register a scm driver
 53 * @scmdrv: driver to be registered
 54 */
 55int scm_driver_register(struct scm_driver *scmdrv)
 56{
 57	struct device_driver *drv = &scmdrv->drv;
 58
 59	drv->bus = &scm_bus_type;
 60
 61	return driver_register(drv);
 62}
 63EXPORT_SYMBOL_GPL(scm_driver_register);
 64
 65/**
 66 * scm_driver_unregister() - deregister a scm driver
 67 * @scmdrv: driver to be deregistered
 68 */
 69void scm_driver_unregister(struct scm_driver *scmdrv)
 70{
 71	driver_unregister(&scmdrv->drv);
 72}
 73EXPORT_SYMBOL_GPL(scm_driver_unregister);
 74
 75void scm_irq_handler(struct aob *aob, blk_status_t error)
 76{
 77	struct aob_rq_header *aobrq = (void *) aob->request.data;
 78	struct scm_device *scmdev = aobrq->scmdev;
 79	struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);
 80
 81	scmdrv->handler(scmdev, aobrq->data, error);
 82}
 83EXPORT_SYMBOL_GPL(scm_irq_handler);
 84
 85#define scm_attr(name)							\
 86static ssize_t show_##name(struct device *dev,				\
 87	       struct device_attribute *attr, char *buf)		\
 88{									\
 89	struct scm_device *scmdev = to_scm_dev(dev);			\
 90	int ret;							\
 91									\
 92	device_lock(dev);						\
 93	ret = sprintf(buf, "%u\n", scmdev->attrs.name);			\
 94	device_unlock(dev);						\
 95									\
 96	return ret;							\
 97}									\
 98static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 99
100scm_attr(persistence);
101scm_attr(oper_state);
102scm_attr(data_state);
103scm_attr(rank);
104scm_attr(release);
105scm_attr(res_id);
106
107static struct attribute *scmdev_attrs[] = {
108	&dev_attr_persistence.attr,
109	&dev_attr_oper_state.attr,
110	&dev_attr_data_state.attr,
111	&dev_attr_rank.attr,
112	&dev_attr_release.attr,
113	&dev_attr_res_id.attr,
114	NULL,
115};
116
117static struct attribute_group scmdev_attr_group = {
118	.attrs = scmdev_attrs,
119};
120
121static const struct attribute_group *scmdev_attr_groups[] = {
122	&scmdev_attr_group,
123	NULL,
124};
125
126static void scmdev_release(struct device *dev)
127{
128	struct scm_device *scmdev = to_scm_dev(dev);
129
130	kfree(scmdev);
131}
132
133static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
134			 unsigned int size, unsigned int max_blk_count)
135{
136	dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
137	scmdev->nr_max_block = max_blk_count;
138	scmdev->address = sale->sa;
139	scmdev->size = 1UL << size;
140	scmdev->attrs.rank = sale->rank;
141	scmdev->attrs.persistence = sale->p;
142	scmdev->attrs.oper_state = sale->op_state;
143	scmdev->attrs.data_state = sale->data_state;
144	scmdev->attrs.rank = sale->rank;
145	scmdev->attrs.release = sale->r;
146	scmdev->attrs.res_id = sale->rid;
147	scmdev->dev.parent = scm_root;
148	scmdev->dev.bus = &scm_bus_type;
149	scmdev->dev.release = scmdev_release;
150	scmdev->dev.groups = scmdev_attr_groups;
151}
152
153/*
154 * Check for state-changes, notify the driver and userspace.
155 */
156static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
157{
158	struct scm_driver *scmdrv;
159	bool changed;
160
161	device_lock(&scmdev->dev);
162	changed = scmdev->attrs.rank != sale->rank ||
163		  scmdev->attrs.oper_state != sale->op_state;
164	scmdev->attrs.rank = sale->rank;
165	scmdev->attrs.oper_state = sale->op_state;
166	if (!scmdev->dev.driver)
167		goto out;
168	scmdrv = to_scm_drv(scmdev->dev.driver);
169	if (changed && scmdrv->notify)
170		scmdrv->notify(scmdev, SCM_CHANGE);
171out:
172	device_unlock(&scmdev->dev);
173	if (changed)
174		kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
175}
176
177static int check_address(struct device *dev, const void *data)
178{
179	struct scm_device *scmdev = to_scm_dev(dev);
180	const struct sale *sale = data;
181
182	return scmdev->address == sale->sa;
183}
184
185static struct scm_device *scmdev_find(struct sale *sale)
186{
187	struct device *dev;
188
189	dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);
190
191	return dev ? to_scm_dev(dev) : NULL;
192}
193
194static int scm_add(struct chsc_scm_info *scm_info, size_t num)
195{
196	struct sale *sale, *scmal = scm_info->scmal;
197	struct scm_device *scmdev;
198	int ret;
199
200	for (sale = scmal; sale < scmal + num; sale++) {
201		scmdev = scmdev_find(sale);
202		if (scmdev) {
203			scmdev_update(scmdev, sale);
204			/* Release reference from scm_find(). */
205			put_device(&scmdev->dev);
206			continue;
207		}
208		scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
209		if (!scmdev)
210			return -ENODEV;
211		scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
212		ret = device_register(&scmdev->dev);
213		if (ret) {
214			/* Release reference from device_initialize(). */
215			put_device(&scmdev->dev);
216			return ret;
217		}
218	}
219
220	return 0;
221}
222
223int scm_update_information(void)
224{
225	struct chsc_scm_info *scm_info;
226	u64 token = 0;
227	size_t num;
228	int ret;
229
230	scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
231	if (!scm_info)
232		return -ENOMEM;
233
234	do {
235		ret = chsc_scm_info(scm_info, token);
236		if (ret)
237			break;
238
239		num = (scm_info->response.length -
240		       (offsetof(struct chsc_scm_info, scmal) -
241			offsetof(struct chsc_scm_info, response))
242		      ) / sizeof(struct sale);
243
244		ret = scm_add(scm_info, num);
245		if (ret)
246			break;
247
248		token = scm_info->restok;
249	} while (token);
250
251	free_page((unsigned long)scm_info);
252
253	return ret;
254}
255
256static int scm_dev_avail(struct device *dev, void *unused)
257{
258	struct scm_driver *scmdrv = to_scm_drv(dev->driver);
259	struct scm_device *scmdev = to_scm_dev(dev);
260
261	if (dev->driver && scmdrv->notify)
262		scmdrv->notify(scmdev, SCM_AVAIL);
263
264	return 0;
265}
266
267int scm_process_availability_information(void)
268{
269	return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
270}
271
272static int __init scm_init(void)
273{
274	int ret;
275
276	ret = bus_register(&scm_bus_type);
277	if (ret)
278		return ret;
279
280	scm_root = root_device_register("scm");
281	if (IS_ERR(scm_root)) {
282		bus_unregister(&scm_bus_type);
283		return PTR_ERR(scm_root);
284	}
285
286	scm_update_information();
287	return 0;
288}
289subsys_initcall_sync(scm_init);