[linux-2.6-block.git] / drivers / s390 / cio / scm.c

/*
 * Recognize and maintain s390 storage class memory.
 *
 * Copyright IBM Corp. 2012
 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <asm/eadm.h>
#include "chsc.h"

static struct device *scm_root;

#define to_scm_dev(n) container_of(n, struct scm_device, dev)
#define	to_scm_drv(d) container_of(d, struct scm_driver, drv)

static int scmdev_probe(struct device *dev)
{
	struct scm_device *scmdev = to_scm_dev(dev);
	struct scm_driver *scmdrv = to_scm_drv(dev->driver);

	return scmdrv->probe ? scmdrv->probe(scmdev) : -ENODEV;
}

static int scmdev_remove(struct device *dev)
{
	struct scm_device *scmdev = to_scm_dev(dev);
	struct scm_driver *scmdrv = to_scm_drv(dev->driver);

	return scmdrv->remove ? scmdrv->remove(scmdev) : -ENODEV;
}

static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	return add_uevent_var(env, "MODALIAS=scm:scmdev");
}

static struct bus_type scm_bus_type = {
	.name  = "scm",
	.probe = scmdev_probe,
	.remove = scmdev_remove,
	.uevent = scmdev_uevent,
};

/**
 * scm_driver_register() - register a scm driver
 * @scmdrv: driver to be registered
 */
int scm_driver_register(struct scm_driver *scmdrv)
{
	struct device_driver *drv = &scmdrv->drv;

	drv->bus = &scm_bus_type;

	return driver_register(drv);
}
EXPORT_SYMBOL_GPL(scm_driver_register);

/**
 * scm_driver_unregister() - deregister a scm driver
 * @scmdrv: driver to be deregistered
 */
void scm_driver_unregister(struct scm_driver *scmdrv)
{
	driver_unregister(&scmdrv->drv);
}
EXPORT_SYMBOL_GPL(scm_driver_unregister);

void scm_irq_handler(struct aob *aob, int error)
{
	struct aob_rq_header *aobrq = (void *) aob->request.data;
	struct scm_device *scmdev = aobrq->scmdev;
	struct scm_driver *scmdrv = to_scm_drv(scmdev->dev.driver);

	scmdrv->handler(scmdev, aobrq->data, error);
}
EXPORT_SYMBOL_GPL(scm_irq_handler);

#define scm_attr(name)							\
static ssize_t show_##name(struct device *dev,				\
	       struct device_attribute *attr, char *buf)		\
{									\
	struct scm_device *scmdev = to_scm_dev(dev);			\
	int ret;							\
									\
	device_lock(dev);						\
	ret = sprintf(buf, "%u\n", scmdev->attrs.name);			\
	device_unlock(dev);						\
									\
	return ret;							\
}									\
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);

scm_attr(persistence);
scm_attr(oper_state);
scm_attr(data_state);
scm_attr(rank);
scm_attr(release);
scm_attr(res_id);

static struct attribute *scmdev_attrs[] = {
	&dev_attr_persistence.attr,
	&dev_attr_oper_state.attr,
	&dev_attr_data_state.attr,
	&dev_attr_rank.attr,
	&dev_attr_release.attr,
	&dev_attr_res_id.attr,
	NULL,
};

static struct attribute_group scmdev_attr_group = {
	.attrs = scmdev_attrs,
};

static const struct attribute_group *scmdev_attr_groups[] = {
	&scmdev_attr_group,
	NULL,
};

static void scmdev_release(struct device *dev)
{
	struct scm_device *scmdev = to_scm_dev(dev);

	kfree(scmdev);
}

static void scmdev_setup(struct scm_device *scmdev, struct sale *sale,
			 unsigned int size, unsigned int max_blk_count)
{
	dev_set_name(&scmdev->dev, "%016llx", (unsigned long long) sale->sa);
	scmdev->nr_max_block = max_blk_count;
	scmdev->address = sale->sa;
	scmdev->size = 1UL << size;
	scmdev->attrs.rank = sale->rank;
	scmdev->attrs.persistence = sale->p;
	scmdev->attrs.oper_state = sale->op_state;
	scmdev->attrs.data_state = sale->data_state;
	scmdev->attrs.rank = sale->rank;
	scmdev->attrs.release = sale->r;
	scmdev->attrs.res_id = sale->rid;
	scmdev->dev.parent = scm_root;
	scmdev->dev.bus = &scm_bus_type;
	scmdev->dev.release = scmdev_release;
	scmdev->dev.groups = scmdev_attr_groups;
}

/*
 * Check for state-changes, notify the driver and userspace.
 */
static void scmdev_update(struct scm_device *scmdev, struct sale *sale)
{
	struct scm_driver *scmdrv;
	bool changed;

	device_lock(&scmdev->dev);
	changed = scmdev->attrs.rank != sale->rank ||
		  scmdev->attrs.oper_state != sale->op_state;
	scmdev->attrs.rank = sale->rank;
	scmdev->attrs.oper_state = sale->op_state;
	if (!scmdev->dev.driver)
		goto out;
	scmdrv = to_scm_drv(scmdev->dev.driver);
	if (changed && scmdrv->notify)
		scmdrv->notify(scmdev, SCM_CHANGE);
out:
	device_unlock(&scmdev->dev);
	if (changed)
		kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
}

static int check_address(struct device *dev, void *data)
{
	struct scm_device *scmdev = to_scm_dev(dev);
	struct sale *sale = data;

	return scmdev->address == sale->sa;
}

static struct scm_device *scmdev_find(struct sale *sale)
{
	struct device *dev;

	dev = bus_find_device(&scm_bus_type, NULL, sale, check_address);

	return dev ? to_scm_dev(dev) : NULL;
}

static int scm_add(struct chsc_scm_info *scm_info, size_t num)
{
	struct sale *sale, *scmal = scm_info->scmal;
	struct scm_device *scmdev;
	int ret;

	for (sale = scmal; sale < scmal + num; sale++) {
		scmdev = scmdev_find(sale);
		if (scmdev) {
			scmdev_update(scmdev, sale);
			/* Release reference from scm_find(). */
			put_device(&scmdev->dev);
			continue;
		}
		scmdev = kzalloc(sizeof(*scmdev), GFP_KERNEL);
		if (!scmdev)
			return -ENODEV;
		scmdev_setup(scmdev, sale, scm_info->is, scm_info->mbc);
		ret = device_register(&scmdev->dev);
		if (ret) {
			/* Release reference from device_initialize(). */
			put_device(&scmdev->dev);
			return ret;
		}
	}

	return 0;
}

int scm_update_information(void)
{
	struct chsc_scm_info *scm_info;
	u64 token = 0;
	size_t num;
	int ret;

	scm_info = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
	if (!scm_info)
		return -ENOMEM;

	do {
		ret = chsc_scm_info(scm_info, token);
		if (ret)
			break;

		num = (scm_info->response.length -
		       (offsetof(struct chsc_scm_info, scmal) -
			offsetof(struct chsc_scm_info, response))
		      ) / sizeof(struct sale);

		ret = scm_add(scm_info, num);
		if (ret)
			break;

		token = scm_info->restok;
	} while (token);

	free_page((unsigned long)scm_info);

	return ret;
}

static int scm_dev_avail(struct device *dev, void *unused)
{
	struct scm_driver *scmdrv = to_scm_drv(dev->driver);
	struct scm_device *scmdev = to_scm_dev(dev);

	if (dev->driver && scmdrv->notify)
		scmdrv->notify(scmdev, SCM_AVAIL);

	return 0;
}

int scm_process_availability_information(void)
{
	return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
}

static int __init scm_init(void)
{
	int ret;

	ret = bus_register(&scm_bus_type);
	if (ret)
		return ret;

	scm_root = root_device_register("scm");
	if (IS_ERR(scm_root)) {
		bus_unregister(&scm_bus_type);
		return PTR_ERR(scm_root);
	}

	scm_update_information();
	return 0;
}
subsys_initcall_sync(scm_init);
Commit	Line	Data
1d1c8f78 SO	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
1d1c8f78 SO	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
	17	static struct device *scm_root;
1d1c8f78 SO	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
	22	static 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
	30	static 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
	38	static int scmdev_uevent(struct device dev, struct kobj_uevent_env env)
	39	{
	40	return add_uevent_var(env, "MODALIAS=scm:scmdev");
	41	}
	42
	43	static 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	*/
	54	int 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	}
	62	EXPORT_SYMBOL_GPL(scm_driver_register);
	63
	64	/**
	65	* scm_driver_unregister() - deregister a scm driver
	66	* @scmdrv: driver to be deregistered
	67	*/
	68	void scm_driver_unregister(struct scm_driver *scmdrv)
	69	{
	70	driver_unregister(&scmdrv->drv);
	71	}
	72	EXPORT_SYMBOL_GPL(scm_driver_unregister);
	73
1d1c8f78 SO	74	void 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	}
	82	EXPORT_SYMBOL_GPL(scm_irq_handler);
	83
	84	#define scm_attr(name) \
	85	static 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	\
c3e6d407	91	device_lock(dev); \
1d1c8f78	92	ret = sprintf(buf, "%u\n", scmdev->attrs.name); \
c3e6d407	93	device_unlock(dev); \
1d1c8f78 SO	94	\
	95	return ret; \
	96	} \
	97	static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
	98
	99	scm_attr(persistence);
	100	scm_attr(oper_state);
	101	scm_attr(data_state);
	102	scm_attr(rank);
	103	scm_attr(release);
	104	scm_attr(res_id);
	105
	106	static 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
	116	static struct attribute_group scmdev_attr_group = {
	117	.attrs = scmdev_attrs,
	118	};
	119
	120	static const struct attribute_group *scmdev_attr_groups[] = {
	121	&scmdev_attr_group,
	122	NULL,
	123	};
	124
	125	static void scmdev_release(struct device *dev)
	126	{
	127	struct scm_device *scmdev = to_scm_dev(dev);
	128
	129	kfree(scmdev);
	130	}
	131
	132	static 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;
1d1c8f78 SO	150	}
1d1c8f78 SO	151
40ff4cc0 SO	152	/*
	153	* Check for state-changes, notify the driver and userspace.
	154	*/
	155	static 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)
93481c90	169	scmdrv->notify(scmdev, SCM_CHANGE);
40ff4cc0 SO	170	out:
	171	device_unlock(&scmdev->dev);
	172	if (changed)
	173	kobject_uevent(&scmdev->dev.kobj, KOBJ_CHANGE);
	174	}
	175
	176	static 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
	184	static 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
1d1c8f78 SO	193	static 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++) {
40ff4cc0 SO	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	}
1d1c8f78 SO	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
40ff4cc0	222	int scm_update_information(void)
1d1c8f78 SO	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
aebfa669 SO	255	static 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
	266	int scm_process_availability_information(void)
	267	{
	268	return bus_for_each_dev(&scm_bus_type, NULL, NULL, scm_dev_avail);
	269	}
	270
1d1c8f78 SO	271	static 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	}
	288	subsys_initcall_sync(scm_init);