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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device.c (2979B)

      1// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
      2/*
      3 * Copyright(c) 2015, 2016 Intel Corporation.
      4 */
      5
      6#include <linux/cdev.h>
      7#include <linux/device.h>
      8#include <linux/fs.h>
      9
     10#include "hfi.h"
     11#include "device.h"
     12
     13static struct class *class;
     14static struct class *user_class;
     15static dev_t hfi1_dev;
     16
     17int hfi1_cdev_init(int minor, const char *name,
     18		   const struct file_operations *fops,
     19		   struct cdev *cdev, struct device **devp,
     20		   bool user_accessible,
     21		   struct kobject *parent)
     22{
     23	const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
     24	struct device *device = NULL;
     25	int ret;
     26
     27	cdev_init(cdev, fops);
     28	cdev->owner = THIS_MODULE;
     29	cdev_set_parent(cdev, parent);
     30	kobject_set_name(&cdev->kobj, name);
     31
     32	ret = cdev_add(cdev, dev, 1);
     33	if (ret < 0) {
     34		pr_err("Could not add cdev for minor %d, %s (err %d)\n",
     35		       minor, name, -ret);
     36		goto done;
     37	}
     38
     39	if (user_accessible)
     40		device = device_create(user_class, NULL, dev, NULL, "%s", name);
     41	else
     42		device = device_create(class, NULL, dev, NULL, "%s", name);
     43
     44	if (IS_ERR(device)) {
     45		ret = PTR_ERR(device);
     46		device = NULL;
     47		pr_err("Could not create device for minor %d, %s (err %d)\n",
     48			minor, name, -ret);
     49		cdev_del(cdev);
     50	}
     51done:
     52	*devp = device;
     53	return ret;
     54}
     55
     56void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
     57{
     58	struct device *device = *devp;
     59
     60	if (device) {
     61		device_unregister(device);
     62		*devp = NULL;
     63
     64		cdev_del(cdev);
     65	}
     66}
     67
     68static const char *hfi1_class_name = "hfi1";
     69
     70const char *class_name(void)
     71{
     72	return hfi1_class_name;
     73}
     74
     75static char *hfi1_devnode(struct device *dev, umode_t *mode)
     76{
     77	if (mode)
     78		*mode = 0600;
     79	return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
     80}
     81
     82static const char *hfi1_class_name_user = "hfi1_user";
     83static const char *class_name_user(void)
     84{
     85	return hfi1_class_name_user;
     86}
     87
     88static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
     89{
     90	if (mode)
     91		*mode = 0666;
     92	return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
     93}
     94
     95int __init dev_init(void)
     96{
     97	int ret;
     98
     99	ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
    100	if (ret < 0) {
    101		pr_err("Could not allocate chrdev region (err %d)\n", -ret);
    102		goto done;
    103	}
    104
    105	class = class_create(THIS_MODULE, class_name());
    106	if (IS_ERR(class)) {
    107		ret = PTR_ERR(class);
    108		pr_err("Could not create device class (err %d)\n", -ret);
    109		unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
    110		goto done;
    111	}
    112	class->devnode = hfi1_devnode;
    113
    114	user_class = class_create(THIS_MODULE, class_name_user());
    115	if (IS_ERR(user_class)) {
    116		ret = PTR_ERR(user_class);
    117		pr_err("Could not create device class for user accessible files (err %d)\n",
    118		       -ret);
    119		class_destroy(class);
    120		class = NULL;
    121		user_class = NULL;
    122		unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
    123		goto done;
    124	}
    125	user_class->devnode = hfi1_user_devnode;
    126
    127done:
    128	return ret;
    129}
    130
    131void dev_cleanup(void)
    132{
    133	class_destroy(class);
    134	class = NULL;
    135
    136	class_destroy(user_class);
    137	user_class = NULL;
    138
    139	unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
    140}