5113f6f70
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kernel add
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/*
* Device driver for s390 storage class memory.
*
* Copyright IBM Corp. 2012
* Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
*/
#define KMSG_COMPONENT "scm_block"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/eadm.h>
#include "scm_blk.h"
static void scm_notify(struct scm_device *scmdev, enum scm_event event)
{
struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
switch (event) {
case SCM_CHANGE:
pr_info("%lx: The capabilities of the SCM increment changed
",
(unsigned long) scmdev->address);
SCM_LOG(2, "State changed");
SCM_LOG_STATE(2, scmdev);
break;
case SCM_AVAIL:
SCM_LOG(2, "Increment available");
SCM_LOG_STATE(2, scmdev);
scm_blk_set_available(bdev);
break;
}
}
static int scm_probe(struct scm_device *scmdev)
{
struct scm_blk_dev *bdev;
int ret;
SCM_LOG(2, "probe");
SCM_LOG_STATE(2, scmdev);
if (scmdev->attrs.oper_state != OP_STATE_GOOD)
return -EINVAL;
bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
if (!bdev)
return -ENOMEM;
dev_set_drvdata(&scmdev->dev, bdev);
ret = scm_blk_dev_setup(bdev, scmdev);
if (ret) {
dev_set_drvdata(&scmdev->dev, NULL);
kfree(bdev);
goto out;
}
out:
return ret;
}
static int scm_remove(struct scm_device *scmdev)
{
struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
scm_blk_dev_cleanup(bdev);
dev_set_drvdata(&scmdev->dev, NULL);
kfree(bdev);
return 0;
}
static struct scm_driver scm_drv = {
.drv = {
.name = "scm_block",
.owner = THIS_MODULE,
},
.notify = scm_notify,
.probe = scm_probe,
.remove = scm_remove,
.handler = scm_blk_irq,
};
int __init scm_drv_init(void)
{
return scm_driver_register(&scm_drv);
}
void scm_drv_cleanup(void)
{
scm_driver_unregister(&scm_drv);
}
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