drivers/s390/block/scm_drv.c

   1 /*
   2  * Device driver for s390 storage class memory.
   3  *
   4  * Copyright IBM Corp. 2012
   5  * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
   6  */
   7
   8 #define KMSG_COMPONENT "scm_block"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <asm/eadm.h>
  14 #include "scm_blk.h"
  15
  16 static void notify(struct scm_device *scmdev)
  17 {
  18         pr_info("%lu: The capabilities of the SCM increment changed\n",
  19                 (unsigned long) scmdev->address);
  20         SCM_LOG(2, "State changed");
  21         SCM_LOG_STATE(2, scmdev);
  22 }
  23
  24 static int scm_probe(struct scm_device *scmdev)
  25 {
  26         struct scm_blk_dev *bdev;
  27         int ret;
  28
  29         SCM_LOG(2, "probe");
  30         SCM_LOG_STATE(2, scmdev);
  31
  32         if (scmdev->attrs.oper_state != OP_STATE_GOOD)
  33                 return -EINVAL;
  34
  35         bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
  36         if (!bdev)
  37                 return -ENOMEM;
  38
  39         dev_set_drvdata(&scmdev->dev, bdev);
  40         ret = scm_blk_dev_setup(bdev, scmdev);
  41         if (ret) {
  42                 dev_set_drvdata(&scmdev->dev, NULL);
  43                 kfree(bdev);
  44                 goto out;
  45         }
  46
  47 out:
  48         return ret;
  49 }
  50
  51 static int scm_remove(struct scm_device *scmdev)
  52 {
  53         struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
  54
  55         scm_blk_dev_cleanup(bdev);
  56         dev_set_drvdata(&scmdev->dev, NULL);
  57         kfree(bdev);
  58
  59         return 0;
  60 }
  61
  62 static struct scm_driver scm_drv = {
  63         .drv = {
  64                 .name = "scm_block",
  65                 .owner = THIS_MODULE,
  66         },
  67         .notify = notify,
  68         .probe = scm_probe,
  69         .remove = scm_remove,
  70         .handler = scm_blk_irq,
  71 };
  72
  73 int __init scm_drv_init(void)
  74 {
  75         return scm_driver_register(&scm_drv);
  76 }
  77
  78 void scm_drv_cleanup(void)
  79 {
  80         scm_driver_unregister(&scm_drv);
  81 }