kernel/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 scm_notify(struct scm_device *scmdev, enum scm_event event)
  17 {
  18         struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
  19
  20         switch (event) {
  21         case SCM_CHANGE:
  22                 pr_info("%lx: The capabilities of the SCM increment changed\n",
  23                         (unsigned long) scmdev->address);
  24                 SCM_LOG(2, "State changed");
  25                 SCM_LOG_STATE(2, scmdev);
  26                 break;
  27         case SCM_AVAIL:
  28                 SCM_LOG(2, "Increment available");
  29                 SCM_LOG_STATE(2, scmdev);
  30                 scm_blk_set_available(bdev);
  31                 break;
  32         }
  33 }
  34
  35 static int scm_probe(struct scm_device *scmdev)
  36 {
  37         struct scm_blk_dev *bdev;
  38         int ret;
  39
  40         SCM_LOG(2, "probe");
  41         SCM_LOG_STATE(2, scmdev);
  42
  43         if (scmdev->attrs.oper_state != OP_STATE_GOOD)
  44                 return -EINVAL;
  45
  46         bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
  47         if (!bdev)
  48                 return -ENOMEM;
  49
  50         dev_set_drvdata(&scmdev->dev, bdev);
  51         ret = scm_blk_dev_setup(bdev, scmdev);
  52         if (ret) {
  53                 dev_set_drvdata(&scmdev->dev, NULL);
  54                 kfree(bdev);
  55                 goto out;
  56         }
  57
  58 out:
  59         return ret;
  60 }
  61
  62 static int scm_remove(struct scm_device *scmdev)
  63 {
  64         struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
  65
  66         scm_blk_dev_cleanup(bdev);
  67         dev_set_drvdata(&scmdev->dev, NULL);
  68         kfree(bdev);
  69
  70         return 0;
  71 }
  72
  73 static struct scm_driver scm_drv = {
  74         .drv = {
  75                 .name = "scm_block",
  76                 .owner = THIS_MODULE,
  77         },
  78         .notify = scm_notify,
  79         .probe = scm_probe,
  80         .remove = scm_remove,
  81         .handler = scm_blk_irq,
  82 };
  83
  84 int __init scm_drv_init(void)
  85 {
  86         return scm_driver_register(&scm_drv);
  87 }
  88
  89 void scm_drv_cleanup(void)
  90 {
  91         scm_driver_unregister(&scm_drv);
  92 }