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
scm_notify(struct scm_device * scmdev,enum scm_event event)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
scm_probe(struct scm_device * scmdev)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
scm_remove(struct scm_device * scmdev)63 static 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
72 static 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
scm_drv_init(void)83 int __init scm_drv_init(void)
84 {
85 return scm_driver_register(&scm_drv);
86 }
87
scm_drv_cleanup(void)88 void scm_drv_cleanup(void)
89 {
90 scm_driver_unregister(&scm_drv);
91 }
92