LXR linux/drivers/s390/block/scm

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Device driver for s390 storage class memory.
   4 *
   5 * Copyright IBM Corp. 2012
   6 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
   7 */
   8
   9#define KMSG_COMPONENT "scm_block"
  10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12#include <linux/module.h>
  13#include <linux/slab.h>
  14#include <asm/eadm.h>
  15#include "scm_blk.h"
  16
  17static void scm_notify(struct scm_device *scmdev, enum scm_event event)
  18{
  19        struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
  20
  21        switch (event) {
  22        case SCM_CHANGE:
  23                pr_info("%lx: The capabilities of the SCM increment changed\n",
  24                        (unsigned long) scmdev->address);
  25                SCM_LOG(2, "State changed");
  26                SCM_LOG_STATE(2, scmdev);
  27                break;
  28        case SCM_AVAIL:
  29                SCM_LOG(2, "Increment available");
  30                SCM_LOG_STATE(2, scmdev);
  31                scm_blk_set_available(bdev);
  32                break;
  33        }
  34}
  35
  36static int scm_probe(struct scm_device *scmdev)
  37{
  38        struct scm_blk_dev *bdev;
  39        int ret;
  40
  41        SCM_LOG(2, "probe");
  42        SCM_LOG_STATE(2, scmdev);
  43
  44        if (scmdev->attrs.oper_state != OP_STATE_GOOD)
  45                return -EINVAL;
  46
  47        bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
  48        if (!bdev)
  49                return -ENOMEM;
  50
  51        dev_set_drvdata(&scmdev->dev, bdev);
  52        ret = scm_blk_dev_setup(bdev, scmdev);
  53        if (ret) {
  54                dev_set_drvdata(&scmdev->dev, NULL);
  55                kfree(bdev);
  56                goto out;
  57        }
  58
  59out:
  60        return ret;
  61}
  62
  63static void scm_remove(struct scm_device *scmdev)
  64{
  65        struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
  66
  67        scm_blk_dev_cleanup(bdev);
  68        dev_set_drvdata(&scmdev->dev, NULL);
  69        kfree(bdev);
  70}
  71
  72static struct scm_driver scm_drv = {
  73        .drv = {
  74                .name = "scm_block",
  75                .owner = THIS_MODULE,
  76        },
  77        .notify = scm_notify,
  78        .probe = scm_probe,
  79        .remove = scm_remove,
  80        .handler = scm_blk_irq,
  81};
  82
  83int __init scm_drv_init(void)
  84{
  85        return scm_driver_register(&scm_drv);
  86}
  87
  88void scm_drv_cleanup(void)
  89{
  90        scm_driver_unregister(&scm_drv);
  91}
  92