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; 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) data->frozen = 1; break; case SNAPSHOT_UNFREEZE: if (!data->frozen || data->ready) break; pm_restore_gfp_mask(); thaw_processes(); data->frozen = 0; 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 = 0; /* * 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 = 0; 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; } mutex_unlock(&pm_mutex); return error; }
#ifdef CONFIG_KEXEC_JUMP if (kexec_image->preserve_context) { lock_system_sleep(); pm_prepare_console(); error = freeze_processes(); if (error) { error = -EBUSY; goto Restore_console; } suspend_console(); error = dpm_suspend_start(PMSG_FREEZE); if (error) goto Resume_console; /* At this point, dpm_suspend_start() has been called, * but *not* dpm_suspend_end(). We *must* call * dpm_suspend_end() now. Otherwise, drivers for * some devices (e.g. interrupt controllers) become * desynchronized with the actual state of the * hardware at resume time, and evil weirdness ensues. */ error = dpm_suspend_end(PMSG_FREEZE); if (error) goto Resume_devices; error = disable_nonboot_cpus(); if (error) goto Enable_cpus; local_irq_disable(); error = syscore_suspend(); if (error) goto Enable_irqs; } else
/** * hibernate - Carry out system hibernation, including saving the image. */ int hibernate(void) { int error; hib_log("entering hibernate()\n"); if (test_action_state(TOI_REPLACE_SWSUSP)) { error = try_tuxonice_hibernate(); return error; } lock_system_sleep(); /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; goto Unlock; } pm_prepare_console(); error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE); if (error) goto Exit; /* Allocate memory management structures */ error = create_basic_memory_bitmaps(); if (error) goto Exit; printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); printk("done.\n"); error = freeze_processes(); if (error) goto Free_bitmaps; error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); if (error || freezer_test_done) goto Thaw; if (in_suspend) { unsigned int flags = 0; if (hibernation_mode == HIBERNATION_PLATFORM) flags |= SF_PLATFORM_MODE; if (nocompress) flags |= SF_NOCOMPRESS_MODE; else flags |= SF_CRC32_MODE; pr_debug("PM: writing image.\n"); error = swsusp_write(flags); swsusp_free(); if (!error) power_down(); in_suspend = 0; pm_restore_gfp_mask(); } else { pr_debug("PM: Image restored successfully.\n"); } Thaw: thaw_processes(); /* Don't bother checking whether freezer_test_done is true */ freezer_test_done = false; Free_bitmaps: free_basic_memory_bitmaps(); Exit: pm_notifier_call_chain(PM_POST_HIBERNATION); pm_restore_console(); atomic_inc(&snapshot_device_available); Unlock: unlock_system_sleep(); return error; }
/** * software_resume - Resume from a saved hibernation image. * * This routine is called as a late initcall, when all devices have been * discovered and initialized already. * * The image reading code is called to see if there is a hibernation image * available for reading. If that is the case, devices are quiesced and the * contents of memory is restored from the saved image. * * If this is successful, control reappears in the restored target kernel in * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine * attempts to recover gracefully and make the kernel return to the normal mode * of operation. */ int software_resume(void) { int error; unsigned int flags; resume_attempted = 1; /* * We can't know (until an image header - if any - is loaded), whether * we did override swsusp. We therefore ensure that both are tried. */ try_tuxonice_resume(); /* * If the user said "noresume".. bail out early. */ if (noresume) return 0; /* * name_to_dev_t() below takes a sysfs buffer mutex when sysfs * is configured into the kernel. Since the regular hibernate * trigger path is via sysfs which takes a buffer mutex before * calling hibernate functions (which take pm_mutex) this can * cause lockdep to complain about a possible ABBA deadlock * which cannot happen since we're in the boot code here and * sysfs can't be invoked yet. Therefore, we use a subclass * here to avoid lockdep complaining. */ mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); if (swsusp_resume_device) goto Check_image; if (!strlen(resume_file)) { error = -ENOENT; goto Unlock; } pr_debug("PM: Checking hibernation image partition %s\n", resume_file); if (resume_delay) { printk(KERN_INFO "Waiting %dsec before reading resume device...\n", resume_delay); ssleep(resume_delay); } /* Check if the device is there */ swsusp_resume_device = name_to_dev_t(resume_file); /* * name_to_dev_t is ineffective to verify parition if resume_file is in * integer format. (e.g. major:minor) */ if (isdigit(resume_file[0]) && resume_wait) { int partno; while (!get_gendisk(swsusp_resume_device, &partno)) msleep(10); } if (!swsusp_resume_device) { /* * Some device discovery might still be in progress; we need * to wait for this to finish. */ wait_for_device_probe(); if (resume_wait) { while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) msleep(10); async_synchronize_full(); } /* * We can't depend on SCSI devices being available after loading * one of their modules until scsi_complete_async_scans() is * called and the resume device usually is a SCSI one. */ scsi_complete_async_scans(); swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { error = -ENODEV; goto Unlock; } } Check_image: pr_debug("PM: Hibernation image partition %d:%d present\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); pr_debug("PM: Looking for hibernation image.\n"); error = swsusp_check(); if (error) goto Unlock; /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; swsusp_close(FMODE_READ); goto Unlock; } pm_prepare_console(); error = pm_notifier_call_chain(PM_RESTORE_PREPARE); if (error) goto close_finish; error = create_basic_memory_bitmaps(); if (error) goto close_finish; pr_debug("PM: Preparing processes for restore.\n"); error = freeze_processes(); if (error) { swsusp_close(FMODE_READ); goto Done; } pr_debug("PM: Loading hibernation image.\n"); error = swsusp_read(&flags); swsusp_close(FMODE_READ); if (!error) hibernation_restore(flags & SF_PLATFORM_MODE); printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n"); swsusp_free(); thaw_processes(); Done: free_basic_memory_bitmaps(); Finish: pm_notifier_call_chain(PM_POST_RESTORE); pm_restore_console(); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: mutex_unlock(&pm_mutex); pr_debug("PM: Hibernation image not present or could not be loaded.\n"); return error; close_finish: swsusp_close(FMODE_READ); goto Finish; }
/** * software_resume - Resume from a saved hibernation image. * * This routine is called as a late initcall, when all devices have been * discovered and initialized already. * * The image reading code is called to see if there is a hibernation image * available for reading. If that is the case, devices are quiesced and the * contents of memory is restored from the saved image. * * If this is successful, control reappears in the restored target kernel in * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine * attempts to recover gracefully and make the kernel return to the normal mode * of operation. */ static int software_resume(void) { int error, nr_calls = 0; /* * If the user said "noresume".. bail out early. */ if (noresume || !hibernation_available()) return 0; /* * name_to_dev_t() below takes a sysfs buffer mutex when sysfs * is configured into the kernel. Since the regular hibernate * trigger path is via sysfs which takes a buffer mutex before * calling hibernate functions (which take pm_mutex) this can * cause lockdep to complain about a possible ABBA deadlock * which cannot happen since we're in the boot code here and * sysfs can't be invoked yet. Therefore, we use a subclass * here to avoid lockdep complaining. */ mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING); if (swsusp_resume_device) goto Check_image; if (!strlen(resume_file)) { error = -ENOENT; goto Unlock; } pr_debug("PM: Checking hibernation image partition %s\n", resume_file); if (resume_delay) { printk(KERN_INFO "Waiting %dsec before reading resume device...\n", resume_delay); ssleep(resume_delay); } /* Check if the device is there */ swsusp_resume_device = name_to_dev_t(resume_file); /* * name_to_dev_t is ineffective to verify parition if resume_file is in * integer format. (e.g. major:minor) */ if (isdigit(resume_file[0]) && resume_wait) { int partno; while (!get_gendisk(swsusp_resume_device, &partno)) msleep(10); } if (!swsusp_resume_device) { /* * Some device discovery might still be in progress; we need * to wait for this to finish. */ wait_for_device_probe(); if (resume_wait) { while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0) msleep(10); async_synchronize_full(); } swsusp_resume_device = name_to_dev_t(resume_file); if (!swsusp_resume_device) { error = -ENODEV; goto Unlock; } } Check_image: pr_debug("PM: Hibernation image partition %d:%d present\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); pr_debug("PM: Looking for hibernation image.\n"); error = swsusp_check(); if (error) goto Unlock; /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; swsusp_close(FMODE_READ); goto Unlock; } pm_prepare_console(); error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls); if (error) { nr_calls--; goto Close_Finish; } pr_debug("PM: Preparing processes for restore.\n"); error = freeze_processes(); if (error) goto Close_Finish; error = load_image_and_restore(); thaw_processes(); Finish: __pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL); pm_restore_console(); atomic_inc(&snapshot_device_available); /* For success case, the suspend path will release the lock */ Unlock: mutex_unlock(&pm_mutex); pr_debug("PM: Hibernation image not present or could not be loaded.\n"); return error; Close_Finish: swsusp_close(FMODE_READ); goto Finish; }
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; data = filp->private_data; switch (cmd) { case SNAPSHOT_FREEZE: if (data->frozen) break; printk("Syncing filesystems ... "); sys_sync(); printk("done.\n"); error = usermodehelper_disable(); if (error) break; error = freeze_processes(); if (error) { thaw_processes(); usermodehelper_enable(); } if (!error) data->frozen = 1; break; case SNAPSHOT_UNFREEZE: if (!data->frozen || data->ready) break; pm_restore_gfp_mask(); thaw_processes(); usermodehelper_enable(); data->frozen = 0; break; case SNAPSHOT_ATOMIC_SNAPSHOT: snapshot_deprecated_ioctl(cmd); 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); if (!error) data->ready = 1; 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 = 0; break; case SNAPSHOT_SET_IMAGE_SIZE: snapshot_deprecated_ioctl(cmd); 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: snapshot_deprecated_ioctl(cmd); 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_GET_SWAP_PAGE: snapshot_deprecated_ioctl(cmd); 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_SET_SWAP_FILE: /* This ioctl is deprecated */ snapshot_deprecated_ioctl(cmd); if (!swsusp_swap_in_use()) { /* * User space encodes device types as two-byte values, * so we need to recode them */ if (old_decode_dev(arg)) { data->swap = swap_type_of(old_decode_dev(arg), 0, NULL); if (data->swap < 0) error = -ENODEV; } else { data->swap = -1; error = -EINVAL; } } else { error = -EPERM; } 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 = 0; 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_PMOPS: /* This ioctl is deprecated */ snapshot_deprecated_ioctl(cmd); error = -EINVAL; switch (arg) { case PMOPS_PREPARE: data->platform_support = 1; error = 0; break; case PMOPS_ENTER: if (data->platform_support) error = hibernation_platform_enter(); break; case PMOPS_FINISH: if (data->platform_support) error = 0; break; default: printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg); } 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; } mutex_unlock(&pm_mutex); return error; }
static void do_suspend(void) { int err; struct suspend_info si; shutting_down = SHUTDOWN_SUSPEND; #ifdef CONFIG_PREEMPT /* If the kernel is preemptible, we need to freeze all the processes to prevent them from being in the middle of a pagetable update during suspend. */ err = freeze_processes(); if (err) { ; goto out; } #endif err = dpm_suspend_start(PMSG_FREEZE); if (err) { ; goto out_thaw; } ; xs_suspend(); err = dpm_suspend_noirq(PMSG_FREEZE); if (err) { ; goto out_resume; } si.cancelled = 1; if (xen_hvm_domain()) { si.arg = 0UL; si.pre = NULL; si.post = &xen_hvm_post_suspend; } else { si.arg = virt_to_mfn(xen_start_info); si.pre = &xen_pre_suspend; si.post = &xen_post_suspend; } err = stop_machine(xen_suspend, &si, cpumask_of(0)); dpm_resume_noirq(si.cancelled ? PMSG_THAW : PMSG_RESTORE); if (err) { ; si.cancelled = 1; } out_resume: if (!si.cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); out_thaw: #ifdef CONFIG_PREEMPT thaw_processes(); out: #endif shutting_down = SHUTDOWN_INVALID; }
/** * hibernate - Carry out system hibernation, including saving the image. */ int hibernate(void) { int error, nr_calls = 0; bool snapshot_test = false; if (!hibernation_available()) { pr_debug("PM: Hibernation not available.\n"); return -EPERM; } lock_system_sleep(); /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { error = -EBUSY; goto Unlock; } pm_prepare_console(); error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls); if (error) { nr_calls--; goto Exit; } printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); printk("done.\n"); error = freeze_processes(); if (error) goto Exit; lock_device_hotplug(); /* Allocate memory management structures */ error = create_basic_memory_bitmaps(); if (error) goto Thaw; error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); if (error || freezer_test_done) goto Free_bitmaps; if (in_suspend) { unsigned int flags = 0; if (hibernation_mode == HIBERNATION_PLATFORM) flags |= SF_PLATFORM_MODE; if (nocompress) flags |= SF_NOCOMPRESS_MODE; else flags |= SF_CRC32_MODE; pr_debug("PM: writing image.\n"); error = swsusp_write(flags); swsusp_free(); if (!error) { if (hibernation_mode == HIBERNATION_TEST_RESUME) snapshot_test = true; else power_down(); } in_suspend = 0; pm_restore_gfp_mask(); } else { pr_debug("PM: Image restored successfully.\n"); } Free_bitmaps: free_basic_memory_bitmaps(); Thaw: unlock_device_hotplug(); if (snapshot_test) { pr_debug("PM: Checking hibernation image\n"); error = swsusp_check(); if (!error) error = load_image_and_restore(); } thaw_processes(); /* Don't bother checking whether freezer_test_done is true */ freezer_test_done = false; Exit: __pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL); pm_restore_console(); atomic_inc(&snapshot_device_available); Unlock: unlock_system_sleep(); return error; }
static void do_suspend(void) { int err; int cancelled = 1; shutting_down = SHUTDOWN_SUSPEND; #ifdef CONFIG_PREEMPT /* If the kernel is preemptible, we need to freeze all the processes to prevent them from being in the middle of a pagetable update during suspend. */ err = freeze_processes(); if (err) { printk(KERN_ERR "xen suspend: freeze failed %d\n", err); goto out; } #endif err = dpm_suspend_start(PMSG_SUSPEND); if (err) { printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err); goto out_thaw; } printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); err = dpm_suspend_noirq(PMSG_SUSPEND); if (err) { printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err); goto out_resume; } err = stop_machine(xen_suspend, &cancelled, cpumask_of(0)); dpm_resume_noirq(PMSG_RESUME); if (err) { printk(KERN_ERR "failed to start xen_suspend: %d\n", err); cancelled = 1; } out_resume: if (!cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(PMSG_RESUME); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); out_thaw: #ifdef CONFIG_PREEMPT thaw_processes(); out: #endif shutting_down = SHUTDOWN_INVALID; }
static void do_suspend(void) { int err; struct suspend_info si; shutting_down = SHUTDOWN_SUSPEND; #ifdef CONFIG_PREEMPT /* If the kernel is preemptible, we need to freeze all the processes to prevent them from being in the middle of a pagetable update during suspend. */ err = freeze_processes(); if (err) { pr_err("%s: freeze failed %d\n", __func__, err); goto out; } #endif err = dpm_suspend_start(PMSG_FREEZE); if (err) { pr_err("%s: dpm_suspend_start %d\n", __func__, err); goto out_thaw; } printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); err = dpm_suspend_end(PMSG_FREEZE); if (err) { pr_err("dpm_suspend_end failed: %d\n", err); si.cancelled = 0; goto out_resume; } si.cancelled = 1; err = stop_machine(xen_suspend, &si, cpumask_of(0)); /* Resume console as early as possible. */ if (!si.cancelled) xen_console_resume(); raw_notifier_call_chain(&xen_resume_notifier, 0, NULL); dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE); if (err) { pr_err("failed to start xen_suspend: %d\n", err); si.cancelled = 1; } out_resume: if (!si.cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); out_thaw: #ifdef CONFIG_PREEMPT thaw_processes(); out: #endif shutting_down = SHUTDOWN_INVALID; }
static void do_suspend(void) { int err; struct suspend_info si; shutting_down = SHUTDOWN_SUSPEND; err = freeze_processes(); if (err) { printk(KERN_ERR "xen suspend: freeze failed %d\n", err); goto out; } err = dpm_suspend_start(PMSG_FREEZE); if (err) { printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err); goto out_thaw; } printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); err = dpm_suspend_end(PMSG_FREEZE); if (err) { printk(KERN_ERR "dpm_suspend_end failed: %d\n", err); si.cancelled = 0; goto out_resume; } si.cancelled = 1; if (xen_hvm_domain()) { si.arg = 0UL; si.pre = NULL; si.post = &xen_hvm_post_suspend; } else { si.arg = virt_to_mfn(xen_start_info); si.pre = &xen_pre_suspend; si.post = &xen_post_suspend; } err = stop_machine(xen_suspend, &si, cpumask_of(0)); dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE); if (err) { printk(KERN_ERR "failed to start xen_suspend: %d\n", err); si.cancelled = 1; } out_resume: if (!si.cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); out_thaw: thaw_processes(); out: shutting_down = SHUTDOWN_INVALID; }
static void do_suspend(void) { int err; struct suspend_info si; shutting_down = SHUTDOWN_SUSPEND; err = freeze_processes(); if (err) { pr_err("%s: freeze failed %d\n", __func__, err); goto out; } err = dpm_suspend_start(PMSG_FREEZE); if (err) { pr_err("%s: dpm_suspend_start %d\n", __func__, err); goto out_thaw; } printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); err = dpm_suspend_end(PMSG_FREEZE); if (err) { pr_err("dpm_suspend_end failed: %d\n", err); si.cancelled = 0; goto out_resume; } si.cancelled = 1; if (xen_hvm_domain()) { si.arg = 0UL; si.pre = NULL; si.post = &xen_hvm_post_suspend; } else { si.arg = virt_to_mfn(xen_start_info); si.pre = &xen_pre_suspend; si.post = &xen_post_suspend; } err = stop_machine(xen_suspend, &si, cpumask_of(0)); /* Resume console as early as possible. */ if (!si.cancelled) xen_console_resume(); dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE); if (err) { pr_err("failed to start xen_suspend: %d\n", err); si.cancelled = 1; } out_resume: if (!si.cancelled) { xen_arch_resume(); xs_resume(); } else xs_suspend_cancel(); dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); out_thaw: thaw_processes(); out: shutting_down = SHUTDOWN_INVALID; }
static int snapshot_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { int error = 0; struct snapshot_data *data; loff_t avail; 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; data = filp->private_data; switch (cmd) { case SNAPSHOT_FREEZE: if (data->frozen) break; mutex_lock(&pm_mutex); if (freeze_processes()) { thaw_processes(); error = -EBUSY; } mutex_unlock(&pm_mutex); if (!error) data->frozen = 1; break; case SNAPSHOT_UNFREEZE: if (!data->frozen) break; mutex_lock(&pm_mutex); thaw_processes(); mutex_unlock(&pm_mutex); data->frozen = 0; break; case SNAPSHOT_ATOMIC_SNAPSHOT: if (data->mode != O_RDONLY || !data->frozen || data->ready) { error = -EPERM; break; } error = snapshot_suspend(data->platform_suspend); if (!error) error = put_user(in_suspend, (unsigned int __user *)arg); if (!error) data->ready = 1; 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 = snapshot_restore(data->platform_suspend); break; case SNAPSHOT_FREE: swsusp_free(); memset(&data->handle, 0, sizeof(struct snapshot_handle)); data->ready = 0; break; case SNAPSHOT_SET_IMAGE_SIZE: image_size = arg; break; case SNAPSHOT_AVAIL_SWAP: avail = count_swap_pages(data->swap, 1); avail <<= PAGE_SHIFT; error = put_user(avail, (loff_t __user *)arg); break; case SNAPSHOT_GET_SWAP_PAGE: if (data->swap < 0 || data->swap >= MAX_SWAPFILES) { error = -ENODEV; break; } if (!data->bitmap) { data->bitmap = alloc_bitmap(count_swap_pages(data->swap, 0)); if (!data->bitmap) { error = -ENOMEM; break; } } offset = alloc_swapdev_block(data->swap, data->bitmap); if (offset) { offset <<= PAGE_SHIFT; error = put_user(offset, (sector_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, data->bitmap); free_bitmap(data->bitmap); data->bitmap = NULL; break; case SNAPSHOT_SET_SWAP_FILE: if (!data->bitmap) { /* * User space encodes device types as two-byte values, * so we need to recode them */ if (old_decode_dev(arg)) { data->swap = swap_type_of(old_decode_dev(arg), 0, NULL); if (data->swap < 0) error = -ENODEV; } else { data->swap = -1; error = -EINVAL; } } else { error = -EPERM; } break; case SNAPSHOT_S2RAM: if (!pm_ops) { error = -ENOSYS; break; } if (!data->frozen) { error = -EPERM; break; } if (!mutex_trylock(&pm_mutex)) { error = -EBUSY; break; } if (pm_ops->prepare) { error = pm_ops->prepare(PM_SUSPEND_MEM); if (error) goto OutS3; } /* Put devices to sleep */ suspend_console(); error = device_suspend(PMSG_SUSPEND); if (error) { printk(KERN_ERR "Failed to suspend some devices.\n"); } else { /* Enter S3, system is already frozen */ suspend_enter(PM_SUSPEND_MEM); /* Wake up devices */ device_resume(); } resume_console(); if (pm_ops->finish) pm_ops->finish(PM_SUSPEND_MEM); OutS3: mutex_unlock(&pm_mutex); break; case SNAPSHOT_PMOPS: error = -EINVAL; switch (arg) { case PMOPS_PREPARE: if (pm_ops && pm_ops->enter) { data->platform_suspend = 1; error = 0; } else { error = -ENOSYS; } break; case PMOPS_ENTER: if (data->platform_suspend) { disable_nonboot_cpus(); kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK); error = pm_ops->enter(PM_SUSPEND_DISK); enable_nonboot_cpus(); } break; case PMOPS_FINISH: if (data->platform_suspend) error = 0; break; default: printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg); } break; case SNAPSHOT_SET_SWAP_AREA: if (data->bitmap) { 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 = old_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; } return error; }