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linux
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user.c
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/* * linux/kernel/power/user.c * * This file provides the user space interface for software suspend/resume. * * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> * * This file is released under the GPLv2. * */ #include <linux/suspend.h> #include <linux/syscalls.h> #include <linux/reboot.h> #include <linux/string.h> #include <linux/device.h> #include <linux/miscdevice.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/swapops.h> #include <linux/pm.h> #include <linux/fs.h> #include <linux/compat.h> #include <linux/console.h> #include <linux/cpu.h> #include <linux/freezer.h> #include <asm/uaccess.h> #include "power.h" #define SNAPSHOT_MINOR 231 static struct snapshot_data { struct snapshot_handle handle; int swap; int mode; bool frozen; bool ready; bool platform_support; bool free_bitmaps; } snapshot_state; atomic_t snapshot_device_available = ATOMIC_INIT(1); static int snapshot_open(struct inode *inode, struct file *filp) { struct snapshot_data *data; int error; if (!hibernation_available()) return -EPERM; lock_system_sleep(); if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; goto Unlock; } if ((filp->f_flags & O_ACCMODE) == O_RDWR) { atomic_inc(&snapshot_device_available); error = -ENOSYS; goto Unlock; } nonseekable_open(inode, filp); data = &snapshot_state; filp->private_data = data; memset(&data->handle, 0, sizeof(struct snapshot_handle)); if ((filp->f_flags & O_ACCMODE) == O_RDONLY) { /* Hibernating. The image device should be accessible. */ data->swap = swsusp_resume_device ? swap_type_of(swsusp_resume_device, 0, NULL) : -1; data->mode = O_RDONLY; data->free_bitmaps = false; error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); if (error) pm_notifier_call_chain(PM_POST_HIBERNATION); } else { /* * Resuming. We may need to wait for the image device to * appear. */ wait_for_device_probe(); data->swap = -1; data->mode = O_WRONLY; error = pm_notifier_call_chain(PM_RESTORE_PREPARE); if (!error) { error = create_basic_memory_bitmaps(); data->free_bitmaps = !error; } if (error) pm_notifier_call_chain(PM_POST_RESTORE); } if (error) atomic_inc(&snapshot_device_available); data->frozen = false; data->ready = false; data->platform_support = false; Unlock: unlock_system_sleep(); return error; } static int snapshot_release(struct inode *inode, struct file *filp) { struct snapshot_data *data; lock_system_sleep(); swsusp_free(); data = filp->private_data; free_all_swap_pages(data->swap); if (data->frozen) { pm_restore_gfp_mask(); free_basic_memory_bitmaps(); thaw_processes(); } else if (data->free_bitmaps) { free_basic_memory_bitmaps(); } pm_notifier_call_chain(data->mode == O_RDONLY ? PM_POST_HIBERNATION : PM_POST_RESTORE); atomic_inc(&snapshot_device_available); unlock_system_sleep(); return 0; } static ssize_t snapshot_read(struct file *filp, char __user *buf, size_t count, loff_t *offp) { struct snapshot_data *data; ssize_t res; loff_t pg_offp = *offp & ~PAGE_MASK; lock_system_sleep(); data = filp->private_data; if (!data->ready) { res = -ENODATA; goto Unlock; } if (!pg_offp) { /* on page boundary? */ res = snapshot_read_next(&data->handle); if (res <= 0) goto Unlock; } else { res = PAGE_SIZE - pg_offp; } res = simple_read_from_buffer(buf, count, &pg_offp, data_of(data->handle), res); if (res > 0) *offp += res; Unlock: unlock_system_sleep(); return res; } static ssize_t snapshot_write(struct file *filp, const char __user *buf, size_t count, loff_t *offp) { struct snapshot_data *data; ssize_t res; loff_t pg_offp = *offp & ~PAGE_MASK; lock_system_sleep(); data = filp->private_data; if (!pg_offp) { res = snapshot_write_next(&data->handle); if (res <= 0) goto unlock; } else { res = PAGE_SIZE - pg_offp; } if (!data_of(data->handle)) { res = -EINVAL; goto unlock; } res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp, buf, count); if (res > 0) *offp += res; unlock: unlock_system_sleep(); return res; } static long snapshot_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { int error = 0; struct snapshot_data *data; loff_t size; sector_t offset; if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC) return -ENOTTY; if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR) return -ENOTTY; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!mutex_trylock(&pm_mutex)) return -EBUSY; lock_device_hotplug(); data = filp->private_data; switch (cmd) { case SNAPSHOT_FREEZE: if (data->frozen) break; printk("Syncing filesystems ... "); sys_sync(); printk("done.\n"); error = freeze_processes(); if (error) break; error = create_basic_memory_bitmaps(); if (error) thaw_processes(); else data->frozen = true; break; case SNAPSHOT_UNFREEZE: if (!data->frozen || data->ready) break; pm_restore_gfp_mask(); free_basic_memory_bitmaps(); data->free_bitmaps = false; thaw_processes(); data->frozen = false; break; case SNAPSHOT_CREATE_IMAGE: if (data->mode != O_RDONLY || !data->frozen || data->ready) { error = -EPERM; break; } pm_restore_gfp_mask(); error = hibernation_snapshot(data->platform_support); if (!error) { error = put_user(in_suspend, (int __user *)arg); data->ready = !freezer_test_done && !error; freezer_test_done = false; } break; case SNAPSHOT_ATOMIC_RESTORE: snapshot_write_finalize(&data->handle); if (data->mode != O_WRONLY || !data->frozen || !snapshot_image_loaded(&data->handle)) { error = -EPERM; break; } error = hibernation_restore(data->platform_support); break; case SNAPSHOT_FREE: swsusp_free(); memset(&data->handle, 0, sizeof(struct snapshot_handle)); data->ready = false; /* * It is necessary to thaw kernel threads here, because * SNAPSHOT_CREATE_IMAGE may be invoked directly after * SNAPSHOT_FREE. In that case, if kernel threads were not * thawed, the preallocation of memory carried out by * hibernation_snapshot() might run into problems (i.e. it * might fail or even deadlock). */ thaw_kernel_threads(); break; case SNAPSHOT_PREF_IMAGE_SIZE: image_size = arg; break; case SNAPSHOT_GET_IMAGE_SIZE: if (!data->ready) { error = -ENODATA; break; } size = snapshot_get_image_size(); size <<= PAGE_SHIFT; error = put_user(size, (loff_t __user *)arg); break; case SNAPSHOT_AVAIL_SWAP_SIZE: size = count_swap_pages(data->swap, 1); size <<= PAGE_SHIFT; error = put_user(size, (loff_t __user *)arg); break; case SNAPSHOT_ALLOC_SWAP_PAGE: if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { error = -ENODEV; break; } offset = alloc_swapdev_block(data->swap); if (offset) { offset <<= PAGE_SHIFT; error = put_user(offset, (loff_t __user *)arg); } else { error = -ENOSPC; } break; case SNAPSHOT_FREE_SWAP_PAGES: if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { error = -ENODEV; break; } free_all_swap_pages(data->swap); break; case SNAPSHOT_S2RAM: if (!data->frozen) { error = -EPERM; break; } /* * Tasks are frozen and the notifiers have been called with * PM_HIBERNATION_PREPARE */ error = suspend_devices_and_enter(PM_SUSPEND_MEM); data->ready = false; break; case SNAPSHOT_PLATFORM_SUPPORT: data->platform_support = !!arg; break; case SNAPSHOT_POWER_OFF: if (data->platform_support) error = hibernation_platform_enter(); break; case SNAPSHOT_SET_SWAP_AREA: if (swsusp_swap_in_use()) { error = -EPERM; } else { struct resume_swap_area swap_area; dev_t swdev; error = copy_from_user(&swap_area, (void __user *)arg, sizeof(struct resume_swap_area)); if (error) { error = -EFAULT; break; } /* * User space encodes device types as two-byte values, * so we need to recode them */ swdev = new_decode_dev(swap_area.dev); if (swdev) { offset = swap_area.offset; data->swap = swap_type_of(swdev, offset, NULL); if (data->swap < 0) error = -ENODEV; } else { data->swap = -1; error = -EINVAL; } } break; default: error = -ENOTTY; } unlock_device_hotplug(); mutex_unlock(&pm_mutex); return error; } #ifdef CONFIG_COMPAT struct compat_resume_swap_area { compat_loff_t offset; u32 dev; } __packed; static long snapshot_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { BUILD_BUG_ON(sizeof(loff_t) != sizeof(compat_loff_t)); switch (cmd) { case SNAPSHOT_GET_IMAGE_SIZE: case SNAPSHOT_AVAIL_SWAP_SIZE: case SNAPSHOT_ALLOC_SWAP_PAGE: { compat_loff_t __user *uoffset = compat_ptr(arg); loff_t offset; mm_segment_t old_fs; int err; old_fs = get_fs(); set_fs(KERNEL_DS); err = snapshot_ioctl(file, cmd, (unsigned long) &offset); set_fs(old_fs); if (!err && put_user(offset, uoffset)) err = -EFAULT; return err; } case SNAPSHOT_CREATE_IMAGE: return snapshot_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); case SNAPSHOT_SET_SWAP_AREA: { struct compat_resume_swap_area __user *u_swap_area = compat_ptr(arg); struct resume_swap_area swap_area; mm_segment_t old_fs; int err; err = get_user(swap_area.offset, &u_swap_area->offset); err |= get_user(swap_area.dev, &u_swap_area->dev); if (err) return -EFAULT; old_fs = get_fs(); set_fs(KERNEL_DS); err = snapshot_ioctl(file, SNAPSHOT_SET_SWAP_AREA, (unsigned long) &swap_area); set_fs(old_fs); return err; } default: return snapshot_ioctl(file, cmd, arg); } } #endif /* CONFIG_COMPAT */ static const struct file_operations snapshot_fops = { .open = snapshot_open, .release = snapshot_release, .read = snapshot_read, .write = snapshot_write, .llseek = no_llseek, .unlocked_ioctl = snapshot_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = snapshot_compat_ioctl, #endif }; static struct miscdevice snapshot_device = { .minor = SNAPSHOT_MINOR, .name = "snapshot", .fops = &snapshot_fops, }; static int __init snapshot_device_init(void) { return misc_register(&snapshot_device); }; device_initcall(snapshot_device_init);
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