s390: add scm bus driver

Bus driver to manage Storage Class Memory.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2012-08-28 16:46:26 +02:00 committed by Martin Schwidefsky
parent 184b08afb5
commit 1d1c8f78be
4 changed files with 330 additions and 0 deletions

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@ -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"

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@ -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 */

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@ -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

271
drivers/s390/cio/scm.c Normal file
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@ -0,0 +1,271 @@
/*
* 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);