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1// SPDX-License-Identifier: GPL-2.02/*3 * Device driver for s390 storage class memory.4 *5 * Copyright IBM Corp. 20126 * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com>7 */8 9#define KMSG_COMPONENT "scm_block"10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt11 12#include <linux/module.h>13#include <linux/slab.h>14#include <asm/eadm.h>15#include "scm_blk.h"16 17static 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 36static 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 59out:60 return ret;61}62 63static 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 72static 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 83int __init scm_drv_init(void)84{85 return scm_driver_register(&scm_drv);86}87 88void scm_drv_cleanup(void)89{90 scm_driver_unregister(&scm_drv);91}92