Quelle  scm_drv.c   Sprache: 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 void 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);
}

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);
}