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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proc.c (3491B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/proc_fs.h>
      3#include <linux/seq_file.h>
      4#include <linux/export.h>
      5#include <linux/suspend.h>
      6#include <linux/bcd.h>
      7#include <linux/acpi.h>
      8#include <linux/uaccess.h>
      9
     10#include "sleep.h"
     11#include "internal.h"
     12
     13/*
     14 * this file provides support for:
     15 * /proc/acpi/wakeup
     16 */
     17
     18static int
     19acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
     20{
     21	struct acpi_device *dev, *tmp;
     22
     23	seq_printf(seq, "Device\tS-state\t  Status   Sysfs node\n");
     24
     25	mutex_lock(&acpi_device_lock);
     26	list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
     27				 wakeup_list) {
     28		struct acpi_device_physical_node *entry;
     29
     30		if (!dev->wakeup.flags.valid)
     31			continue;
     32
     33		seq_printf(seq, "%s\t  S%d\t",
     34			   dev->pnp.bus_id,
     35			   (u32) dev->wakeup.sleep_state);
     36
     37		mutex_lock(&dev->physical_node_lock);
     38
     39		if (!dev->physical_node_count) {
     40			seq_printf(seq, "%c%-8s\n",
     41				dev->wakeup.flags.valid ? '*' : ' ',
     42				device_may_wakeup(&dev->dev) ?
     43					"enabled" : "disabled");
     44		} else {
     45			struct device *ldev;
     46			list_for_each_entry(entry, &dev->physical_node_list,
     47					node) {
     48				ldev = get_device(entry->dev);
     49				if (!ldev)
     50					continue;
     51
     52				if (&entry->node !=
     53						dev->physical_node_list.next)
     54					seq_printf(seq, "\t\t");
     55
     56				seq_printf(seq, "%c%-8s  %s:%s\n",
     57					dev->wakeup.flags.valid ? '*' : ' ',
     58					(device_may_wakeup(&dev->dev) ||
     59					device_may_wakeup(ldev)) ?
     60					"enabled" : "disabled",
     61					ldev->bus ? ldev->bus->name :
     62					"no-bus", dev_name(ldev));
     63				put_device(ldev);
     64			}
     65		}
     66
     67		mutex_unlock(&dev->physical_node_lock);
     68	}
     69	mutex_unlock(&acpi_device_lock);
     70	return 0;
     71}
     72
     73static void physical_device_enable_wakeup(struct acpi_device *adev)
     74{
     75	struct acpi_device_physical_node *entry;
     76
     77	mutex_lock(&adev->physical_node_lock);
     78
     79	list_for_each_entry(entry,
     80		&adev->physical_node_list, node)
     81		if (entry->dev && device_can_wakeup(entry->dev)) {
     82			bool enable = !device_may_wakeup(entry->dev);
     83			device_set_wakeup_enable(entry->dev, enable);
     84		}
     85
     86	mutex_unlock(&adev->physical_node_lock);
     87}
     88
     89static ssize_t
     90acpi_system_write_wakeup_device(struct file *file,
     91				const char __user * buffer,
     92				size_t count, loff_t * ppos)
     93{
     94	struct acpi_device *dev, *tmp;
     95	char strbuf[5];
     96	char str[5] = "";
     97
     98	if (count > 4)
     99		count = 4;
    100
    101	if (copy_from_user(strbuf, buffer, count))
    102		return -EFAULT;
    103	strbuf[count] = '\0';
    104	sscanf(strbuf, "%s", str);
    105
    106	mutex_lock(&acpi_device_lock);
    107	list_for_each_entry_safe(dev, tmp, &acpi_wakeup_device_list,
    108				 wakeup_list) {
    109		if (!dev->wakeup.flags.valid)
    110			continue;
    111
    112		if (!strncmp(dev->pnp.bus_id, str, 4)) {
    113			if (device_can_wakeup(&dev->dev)) {
    114				bool enable = !device_may_wakeup(&dev->dev);
    115				device_set_wakeup_enable(&dev->dev, enable);
    116			} else {
    117				physical_device_enable_wakeup(dev);
    118			}
    119			break;
    120		}
    121	}
    122	mutex_unlock(&acpi_device_lock);
    123	return count;
    124}
    125
    126static int
    127acpi_system_wakeup_device_open_fs(struct inode *inode, struct file *file)
    128{
    129	return single_open(file, acpi_system_wakeup_device_seq_show,
    130			   pde_data(inode));
    131}
    132
    133static const struct proc_ops acpi_system_wakeup_device_proc_ops = {
    134	.proc_open	= acpi_system_wakeup_device_open_fs,
    135	.proc_read	= seq_read,
    136	.proc_write	= acpi_system_write_wakeup_device,
    137	.proc_lseek	= seq_lseek,
    138	.proc_release	= single_release,
    139};
    140
    141void __init acpi_sleep_proc_init(void)
    142{
    143	/* 'wakeup device' [R/W] */
    144	proc_create("wakeup", S_IFREG | S_IRUGO | S_IWUSR,
    145		    acpi_root_dir, &acpi_system_wakeup_device_proc_ops);
    146}