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Commit 1d1c8f78 authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

s390: add scm bus driver 



Bus driver to manage Storage Class Memory.

Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 184b08af

arch/s390/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -433,6 +433,13 @@ config CHSC_SCH 


	  If unsure, say N.



config SCM_BUS

	def_bool y

	depends on 64BIT

	prompt "SCM bus driver"

	help

	  Bus driver for Storage Class Memory.



endmenu



menu "Dump support"

arch/s390/include/asm/eadm.h

+51 −0
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
#define _ASM_S390_EADM_H



#include <linux/types.h>

#include <linux/device.h>

#include <linux/spinlock.h>



struct arqb {

	u64 data;
@@ -71,4 +73,53 @@ struct aob { 
	struct msb msb[AOB_NR_MSB];

} __packed __aligned(PAGE_SIZE);



struct aob_rq_header {

	struct scm_device *scmdev;

	char data[0];

};



struct scm_device {

	u64 address;

	u64 size;

	unsigned int nr_max_block;

	struct device dev;

	spinlock_t lock;

	struct {

		unsigned int persistence:4;

		unsigned int oper_state:4;

		unsigned int data_state:4;

		unsigned int rank:4;

		unsigned int release:1;

		unsigned int res_id:8;

	} __packed attrs;

};



#define OP_STATE_GOOD		1

#define OP_STATE_TEMP_ERR	2

#define OP_STATE_PERM_ERR	3



struct scm_driver {

	struct device_driver drv;

	int (*probe) (struct scm_device *scmdev);

	int (*remove) (struct scm_device *scmdev);

	void (*handler) (struct scm_device *scmdev, void *data, int error);

};



int scm_driver_register(struct scm_driver *scmdrv);

void scm_driver_unregister(struct scm_driver *scmdrv);



int scm_start_aob(struct aob *aob);

void scm_irq_handler(struct aob *aob, int error);



struct eadm_ops {

	int (*eadm_start) (struct aob *aob);

	struct module *owner;

};



int scm_get_ref(void);

void scm_put_ref(void);



void register_eadm_ops(struct eadm_ops *ops);

void unregister_eadm_ops(struct eadm_ops *ops);



#endif /* _ASM_S390_EADM_H */

drivers/s390/cio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ ccw_device-objs += device.o device_fsm.o device_ops.o 
ccw_device-objs += device_id.o device_pgid.o device_status.o

obj-y += ccw_device.o cmf.o

obj-$(CONFIG_CHSC_SCH) += chsc_sch.o

obj-$(CONFIG_SCM_BUS) += scm.o

obj-$(CONFIG_CCWGROUP) += ccwgroup.o



qdio-objs := qdio_main.o qdio_thinint.o qdio_debug.o qdio_setup.o

drivers/s390/cio/scm.c

0 → 100644
+271 −0
Original line number Diff line number Diff line 
/*

 * Recognize and maintain s390 storage class memory.

 *

 * Copyright IBM Corp. 2012

 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>

 */



#include <linux/spinlock.h>

#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;

static struct eadm_ops *eadm_ops;

static DEFINE_MUTEX(eadm_ops_mutex);



#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);



int scm_get_ref(void)

{

	int ret = 0;



	mutex_lock(&eadm_ops_mutex);

	if (!eadm_ops || !try_module_get(eadm_ops->owner))

		ret = -ENOENT;

	mutex_unlock(&eadm_ops_mutex);



	return ret;

}

EXPORT_SYMBOL_GPL(scm_get_ref);



void scm_put_ref(void)

{

	mutex_lock(&eadm_ops_mutex);

	module_put(eadm_ops->owner);

	mutex_unlock(&eadm_ops_mutex);

}

EXPORT_SYMBOL_GPL(scm_put_ref);



void register_eadm_ops(struct eadm_ops *ops)

{

	mutex_lock(&eadm_ops_mutex);

	eadm_ops = ops;

	mutex_unlock(&eadm_ops_mutex);

}

EXPORT_SYMBOL_GPL(register_eadm_ops);



void unregister_eadm_ops(struct eadm_ops *ops)

{

	mutex_lock(&eadm_ops_mutex);

	eadm_ops = NULL;

	mutex_unlock(&eadm_ops_mutex);

}

EXPORT_SYMBOL_GPL(unregister_eadm_ops);



int scm_start_aob(struct aob *aob)

{

	return eadm_ops->eadm_start(aob);

}

EXPORT_SYMBOL_GPL(scm_start_aob);



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;							\

									\

	spin_lock(&scmdev->lock);					\

	ret = sprintf(buf, "%u\n", scmdev->attrs.name);			\

	spin_unlock(&scmdev->lock);					\

									\

	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;

	spin_lock_init(&scmdev->lock);

}



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 = 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;

}



static 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 __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);