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 pr_fmt(fmt) "scm_block: " fmt
10
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <asm/eadm.h>
14#include "scm_blk.h"
15
16static 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
35static 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
58out:
59	return ret;
60}
61
62static void 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
71static struct scm_driver scm_drv = {
72	.drv = {
73		.name = "scm_block",
74		.owner = THIS_MODULE,
75	},
76	.notify = scm_notify,
77	.probe = scm_probe,
78	.remove = scm_remove,
79	.handler = scm_blk_irq,
80};
81
82int __init scm_drv_init(void)
83{
84	return scm_driver_register(&scm_drv);
85}
86
87void scm_drv_cleanup(void)
88{
89	scm_driver_unregister(&scm_drv);
90}