drivers/s390/block/scm_drv.c

   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
  17 static 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
  36 static 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
  59 out:
  60         return ret;
  61 }
  62
  63 static int 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         return 0;
  72 }
  73
  74 static struct scm_driver scm_drv = {
  75         .drv = {
  76                 .name = "scm_block",
  77                 .owner = THIS_MODULE,
  78         },
  79         .notify = scm_notify,
  80         .probe = scm_probe,
  81         .remove = scm_remove,
  82         .handler = scm_blk_irq,
  83 };
  84
  85 int __init scm_drv_init(void)
  86 {
  87         return scm_driver_register(&scm_drv);
  88 }
  89
  90 void scm_drv_cleanup(void)
  91 {
  92         scm_driver_unregister(&scm_drv);
  93 }