cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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scm_drv.c (1811B)

      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
     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}