94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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\n",
|
|
(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);
|
|
}
|