xref: /openbmc/linux/drivers/s390/block/scm_drv.c (revision 15f83bb0)
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