Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * linux/kernel/power/user.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * This file provides the user space interface for software suspend/resume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/swapops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "power.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static struct snapshot_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct snapshot_handle handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	int swap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	int mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	bool frozen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	bool ready;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	bool platform_support;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	bool free_bitmaps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	dev_t dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) } snapshot_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) int is_hibernate_resume_dev(dev_t dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return hibernation_available() && snapshot_state.dev == dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int snapshot_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct snapshot_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (!hibernation_available())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	lock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (!hibernate_acquire()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		error = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		goto Unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		hibernate_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		error = -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		goto Unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	nonseekable_open(inode, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	data = &snapshot_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	filp->private_data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	memset(&data->handle, 0, sizeof(struct snapshot_handle));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		/* Hibernating.  The image device should be accessible. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		data->swap = swap_type_of(swsusp_resume_device, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		data->mode = O_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		data->free_bitmaps = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		 * Resuming.  We may need to wait for the image device to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		 * appear.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		wait_for_device_probe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		data->swap = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		data->mode = O_WRONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		error = pm_notifier_call_chain_robust(PM_RESTORE_PREPARE, PM_POST_RESTORE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		if (!error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			error = create_basic_memory_bitmaps();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			data->free_bitmaps = !error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		hibernate_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	data->frozen = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	data->ready = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	data->platform_support = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	data->dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  Unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	unlock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static int snapshot_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct snapshot_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	lock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	swsusp_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	data = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	data->dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	free_all_swap_pages(data->swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (data->frozen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		pm_restore_gfp_mask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		free_basic_memory_bitmaps();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		thaw_processes();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	} else if (data->free_bitmaps) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		free_basic_memory_bitmaps();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	pm_notifier_call_chain(data->mode == O_RDONLY ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			PM_POST_HIBERNATION : PM_POST_RESTORE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	hibernate_release();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	unlock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static ssize_t snapshot_read(struct file *filp, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)                              size_t count, loff_t *offp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	struct snapshot_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	ssize_t res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	loff_t pg_offp = *offp & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	lock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	data = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (!data->ready) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		res = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		goto Unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!pg_offp) { /* on page boundary? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		res = snapshot_read_next(&data->handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if (res <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			goto Unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		res = PAGE_SIZE - pg_offp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	res = simple_read_from_buffer(buf, count, &pg_offp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			data_of(data->handle), res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (res > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		*offp += res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)  Unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	unlock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static ssize_t snapshot_write(struct file *filp, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)                               size_t count, loff_t *offp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct snapshot_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	ssize_t res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	loff_t pg_offp = *offp & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	lock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	data = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (!pg_offp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		res = snapshot_write_next(&data->handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		if (res <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		res = PAGE_SIZE - pg_offp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (!data_of(data->handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		res = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (res > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		*offp += res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	unlock_system_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct compat_resume_swap_area {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	compat_loff_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	u32 dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int snapshot_set_swap_area(struct snapshot_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		void __user *argp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	sector_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	dev_t swdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (swsusp_swap_in_use())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (in_compat_syscall()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		struct compat_resume_swap_area swap_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		if (copy_from_user(&swap_area, argp, sizeof(swap_area)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		swdev = new_decode_dev(swap_area.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		offset = swap_area.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		struct resume_swap_area swap_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		if (copy_from_user(&swap_area, argp, sizeof(swap_area)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		swdev = new_decode_dev(swap_area.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		offset = swap_area.offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 * User space encodes device types as two-byte values,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 * so we need to recode them
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	data->swap = swap_type_of(swdev, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (data->swap < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return swdev ? -ENODEV : -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	data->dev = swdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static long snapshot_ioctl(struct file *filp, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 							unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct snapshot_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	loff_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	sector_t offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (!capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (!mutex_trylock(&system_transition_mutex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	lock_device_hotplug();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	data = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	case SNAPSHOT_FREEZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		if (data->frozen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		ksys_sync_helper();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		error = freeze_processes();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		error = create_basic_memory_bitmaps();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			thaw_processes();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 			data->frozen = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	case SNAPSHOT_UNFREEZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (!data->frozen || data->ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		pm_restore_gfp_mask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		free_basic_memory_bitmaps();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		data->free_bitmaps = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		thaw_processes();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		data->frozen = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	case SNAPSHOT_CREATE_IMAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		if (data->mode != O_RDONLY || !data->frozen  || data->ready) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		pm_restore_gfp_mask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		error = hibernation_snapshot(data->platform_support);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		if (!error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			error = put_user(in_suspend, (int __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			data->ready = !freezer_test_done && !error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			freezer_test_done = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	case SNAPSHOT_ATOMIC_RESTORE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		snapshot_write_finalize(&data->handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		if (data->mode != O_WRONLY || !data->frozen ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		    !snapshot_image_loaded(&data->handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		error = hibernation_restore(data->platform_support);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	case SNAPSHOT_FREE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		swsusp_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		memset(&data->handle, 0, sizeof(struct snapshot_handle));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		data->ready = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		 * It is necessary to thaw kernel threads here, because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		 * SNAPSHOT_CREATE_IMAGE may be invoked directly after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		 * SNAPSHOT_FREE.  In that case, if kernel threads were not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		 * thawed, the preallocation of memory carried out by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		 * hibernation_snapshot() might run into problems (i.e. it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		 * might fail or even deadlock).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		thaw_kernel_threads();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	case SNAPSHOT_PREF_IMAGE_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		image_size = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	case SNAPSHOT_GET_IMAGE_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		if (!data->ready) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			error = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		size = snapshot_get_image_size();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		size <<= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		error = put_user(size, (loff_t __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	case SNAPSHOT_AVAIL_SWAP_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		size = count_swap_pages(data->swap, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		size <<= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		error = put_user(size, (loff_t __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	case SNAPSHOT_ALLOC_SWAP_PAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			error = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		offset = alloc_swapdev_block(data->swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		if (offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			offset <<= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			error = put_user(offset, (loff_t __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 			error = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	case SNAPSHOT_FREE_SWAP_PAGES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			error = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		free_all_swap_pages(data->swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	case SNAPSHOT_S2RAM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		if (!data->frozen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		 * Tasks are frozen and the notifiers have been called with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		 * PM_HIBERNATION_PREPARE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		error = suspend_devices_and_enter(PM_SUSPEND_MEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		data->ready = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	case SNAPSHOT_PLATFORM_SUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 		data->platform_support = !!arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	case SNAPSHOT_POWER_OFF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		if (data->platform_support)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 			error = hibernation_platform_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	case SNAPSHOT_SET_SWAP_AREA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 		error = snapshot_set_swap_area(data, (void __user *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		error = -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	unlock_device_hotplug();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	mutex_unlock(&system_transition_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) static long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) snapshot_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	BUILD_BUG_ON(sizeof(loff_t) != sizeof(compat_loff_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	case SNAPSHOT_GET_IMAGE_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	case SNAPSHOT_AVAIL_SWAP_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	case SNAPSHOT_ALLOC_SWAP_PAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	case SNAPSHOT_CREATE_IMAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	case SNAPSHOT_SET_SWAP_AREA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 		return snapshot_ioctl(file, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 				      (unsigned long) compat_ptr(arg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		return snapshot_ioctl(file, cmd, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) #endif /* CONFIG_COMPAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static const struct file_operations snapshot_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	.open = snapshot_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	.release = snapshot_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	.read = snapshot_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	.write = snapshot_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	.llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	.unlocked_ioctl = snapshot_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	.compat_ioctl = snapshot_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static struct miscdevice snapshot_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	.minor = SNAPSHOT_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	.name = "snapshot",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	.fops = &snapshot_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) static int __init snapshot_device_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	return misc_register(&snapshot_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) device_initcall(snapshot_device_init);