s390/block/scm_drv.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Device driver for s390 storage class memory.
0004  *
0005  * Copyright IBM Corp. 2012
0006  * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>
0007  */
0008
0009 #define KMSG_COMPONENT "scm_block"
0010 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0011
0012 #include <linux/module.h>
0013 #include <linux/slab.h>
0014 #include <asm/eadm.h>
0015 #include "scm_blk.h"
0016
0017 static void scm_notify(struct scm_device *scmdev, enum scm_event event)
0018 {
0019     struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
0020
0021     switch (event) {
0022     case SCM_CHANGE:
0023         pr_info("%lx: The capabilities of the SCM increment changed\n",
0024             (unsigned long) scmdev->address);
0025         SCM_LOG(2, "State changed");
0026         SCM_LOG_STATE(2, scmdev);
0027         break;
0028     case SCM_AVAIL:
0029         SCM_LOG(2, "Increment available");
0030         SCM_LOG_STATE(2, scmdev);
0031         scm_blk_set_available(bdev);
0032         break;
0033     }
0034 }
0035
0036 static int scm_probe(struct scm_device *scmdev)
0037 {
0038     struct scm_blk_dev *bdev;
0039     int ret;
0040
0041     SCM_LOG(2, "probe");
0042     SCM_LOG_STATE(2, scmdev);
0043
0044     if (scmdev->attrs.oper_state != OP_STATE_GOOD)
0045         return -EINVAL;
0046
0047     bdev = kzalloc(sizeof(*bdev), GFP_KERNEL);
0048     if (!bdev)
0049         return -ENOMEM;
0050
0051     dev_set_drvdata(&scmdev->dev, bdev);
0052     ret = scm_blk_dev_setup(bdev, scmdev);
0053     if (ret) {
0054         dev_set_drvdata(&scmdev->dev, NULL);
0055         kfree(bdev);
0056         goto out;
0057     }
0058
0059 out:
0060     return ret;
0061 }
0062
0063 static void scm_remove(struct scm_device *scmdev)
0064 {
0065     struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
0066
0067     scm_blk_dev_cleanup(bdev);
0068     dev_set_drvdata(&scmdev->dev, NULL);
0069     kfree(bdev);
0070 }
0071
0072 static struct scm_driver scm_drv = {
0073     .drv = {
0074         .name = "scm_block",
0075         .owner = THIS_MODULE,
0076     },
0077     .notify = scm_notify,
0078     .probe = scm_probe,
0079     .remove = scm_remove,
0080     .handler = scm_blk_irq,
0081 };
0082
0083 int __init scm_drv_init(void)
0084 {
0085     return scm_driver_register(&scm_drv);
0086 }
0087
0088 void scm_drv_cleanup(void)
0089 {
0090     scm_driver_unregister(&scm_drv);
0091 }