diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 2 | ||||
| -rw-r--r-- | kernel/freezer.c | 6 | ||||
| -rw-r--r-- | kernel/kexec.c | 8 | ||||
| -rw-r--r-- | kernel/power/Makefile | 3 | ||||
| -rw-r--r-- | kernel/power/hibernate.c | 47 | ||||
| -rw-r--r-- | kernel/power/main.c | 20 | ||||
| -rw-r--r-- | kernel/power/power.h | 7 | ||||
| -rw-r--r-- | kernel/power/process.c | 24 | ||||
| -rw-r--r-- | kernel/power/qos.c | 23 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 7 | ||||
| -rw-r--r-- | kernel/power/suspend.c | 84 | ||||
| -rw-r--r-- | kernel/power/user.c | 12 |
12 files changed, 116 insertions, 127 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index ce5f758f40b..0ed15fed579 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -424,7 +424,7 @@ void daemonize(const char *name, ...) */ exit_mm(current); /* - * We don't want to have TIF_FREEZE set if the system-wide hibernation + * We don't want to get frozen, in case system-wide hibernation * or suspend transition begins right now. */ current->flags |= (PF_NOFREEZE | PF_KTHREAD); diff --git a/kernel/freezer.c b/kernel/freezer.c index 9815b8d1eed..11f82a4d4ea 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -99,9 +99,9 @@ static void fake_signal_wake_up(struct task_struct *p) * freeze_task - send a freeze request to given task * @p: task to send the request to * - * If @p is freezing, the freeze request is sent by setting %TIF_FREEZE - * flag and either sending a fake signal to it or waking it up, depending - * on whether it has %PF_FREEZER_NOSIG set. + * If @p is freezing, the freeze request is sent either by sending a fake + * signal (if it's not a kernel thread) or waking it up (if it's a kernel + * thread). * * RETURNS: * %false, if @p is not freezing or already frozen; %true, otherwise diff --git a/kernel/kexec.c b/kernel/kexec.c index 7b088678670..a6a675cb981 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -1546,13 +1546,13 @@ int kernel_kexec(void) if (error) goto Resume_console; /* At this point, dpm_suspend_start() has been called, - * but *not* dpm_suspend_noirq(). We *must* call - * dpm_suspend_noirq() now. Otherwise, drivers for + * 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_noirq(PMSG_FREEZE); + error = dpm_suspend_end(PMSG_FREEZE); if (error) goto Resume_devices; error = disable_nonboot_cpus(); @@ -1579,7 +1579,7 @@ int kernel_kexec(void) local_irq_enable(); Enable_cpus: enable_nonboot_cpus(); - dpm_resume_noirq(PMSG_RESTORE); + dpm_resume_start(PMSG_RESTORE); Resume_devices: dpm_resume_end(PMSG_RESTORE); Resume_console: diff --git a/kernel/power/Makefile b/kernel/power/Makefile index 07e0e28ffba..66d808ec525 100644 --- a/kernel/power/Makefile +++ b/kernel/power/Makefile @@ -1,7 +1,8 @@ ccflags-$(CONFIG_PM_DEBUG) := -DDEBUG -obj-$(CONFIG_PM) += main.o qos.o +obj-y += qos.o +obj-$(CONFIG_PM) += main.o obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o obj-$(CONFIG_FREEZER) += process.o obj-$(CONFIG_SUSPEND) += suspend.o diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 6d6d2887033..0a186cfde78 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -245,8 +245,8 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop, * create_image - Create a hibernation image. * @platform_mode: Whether or not to use the platform driver. * - * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image - * and execute the drivers' .thaw_noirq() callbacks. + * Execute device drivers' "late" and "noirq" freeze callbacks, create a + * hibernation image and run the drivers' "noirq" and "early" thaw callbacks. * * Control reappears in this routine after the subsequent restore. */ @@ -254,7 +254,7 @@ static int create_image(int platform_mode) { int error; - error = dpm_suspend_noirq(PMSG_FREEZE); + error = dpm_suspend_end(PMSG_FREEZE); if (error) { printk(KERN_ERR "PM: Some devices failed to power down, " "aborting hibernation\n"); @@ -306,7 +306,7 @@ static int create_image(int platform_mode) Platform_finish: platform_finish(platform_mode); - dpm_resume_noirq(in_suspend ? + dpm_resume_start(in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE); return error; @@ -343,13 +343,13 @@ int hibernation_snapshot(int platform_mode) * successful freezer test. */ freezer_test_done = true; - goto Cleanup; + goto Thaw; } error = dpm_prepare(PMSG_FREEZE); if (error) { dpm_complete(PMSG_RECOVER); - goto Cleanup; + goto Thaw; } suspend_console(); @@ -385,6 +385,8 @@ int hibernation_snapshot(int platform_mode) platform_end(platform_mode); return error; + Thaw: + thaw_kernel_threads(); Cleanup: swsusp_free(); goto Close; @@ -394,16 +396,16 @@ int hibernation_snapshot(int platform_mode) * resume_target_kernel - Restore system state from a hibernation image. * @platform_mode: Whether or not to use the platform driver. * - * Execute device drivers' .freeze_noirq() callbacks, restore the contents of - * highmem that have not been restored yet from the image and run the low-level - * code that will restore the remaining contents of memory and switch to the - * just restored target kernel. + * Execute device drivers' "noirq" and "late" freeze callbacks, restore the + * contents of highmem that have not been restored yet from the image and run + * the low-level code that will restore the remaining contents of memory and + * switch to the just restored target kernel. */ static int resume_target_kernel(bool platform_mode) { int error; - error = dpm_suspend_noirq(PMSG_QUIESCE); + error = dpm_suspend_end(PMSG_QUIESCE); if (error) { printk(KERN_ERR "PM: Some devices failed to power down, " "aborting resume\n"); @@ -460,7 +462,7 @@ static int resume_target_kernel(bool platform_mode) Cleanup: platform_restore_cleanup(platform_mode); - dpm_resume_noirq(PMSG_RECOVER); + dpm_resume_start(PMSG_RECOVER); return error; } @@ -518,7 +520,7 @@ int hibernation_platform_enter(void) goto Resume_devices; } - error = dpm_suspend_noirq(PMSG_HIBERNATE); + error = dpm_suspend_end(PMSG_HIBERNATE); if (error) goto Resume_devices; @@ -549,7 +551,7 @@ int hibernation_platform_enter(void) Platform_finish: hibernation_ops->finish(); - dpm_resume_noirq(PMSG_RESTORE); + dpm_resume_start(PMSG_RESTORE); Resume_devices: entering_platform_hibernation = false; @@ -616,7 +618,7 @@ int hibernate(void) /* Allocate memory management structures */ error = create_basic_memory_bitmaps(); if (error) - goto Exit; + goto Enable_umh; printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); @@ -624,15 +626,11 @@ int hibernate(void) error = freeze_processes(); if (error) - goto Finish; + goto Free_bitmaps; error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); - if (error) - goto Thaw; - if (freezer_test_done) { - freezer_test_done = false; + if (error || freezer_test_done) goto Thaw; - } if (in_suspend) { unsigned int flags = 0; @@ -657,8 +655,13 @@ int hibernate(void) Thaw: thaw_processes(); - Finish: + + /* Don't bother checking whether freezer_test_done is true */ + freezer_test_done = false; + + Free_bitmaps: free_basic_memory_bitmaps(); + Enable_umh: usermodehelper_enable(); Exit: pm_notifier_call_chain(PM_POST_HIBERNATION); diff --git a/kernel/power/main.c b/kernel/power/main.c index 9824b41e5a1..1c12581f1c6 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -165,16 +165,20 @@ static int suspend_stats_show(struct seq_file *s, void *unused) last_errno %= REC_FAILED_NUM; last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; last_step %= REC_FAILED_NUM; - seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n" - "%s: %d\n%s: %d\n%s: %d\n%s: %d\n", + seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" + "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", "success", suspend_stats.success, "fail", suspend_stats.fail, "failed_freeze", suspend_stats.failed_freeze, "failed_prepare", suspend_stats.failed_prepare, "failed_suspend", suspend_stats.failed_suspend, + "failed_suspend_late", + suspend_stats.failed_suspend_late, "failed_suspend_noirq", suspend_stats.failed_suspend_noirq, "failed_resume", suspend_stats.failed_resume, + "failed_resume_early", + suspend_stats.failed_resume_early, "failed_resume_noirq", suspend_stats.failed_resume_noirq); seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", @@ -287,16 +291,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, #ifdef CONFIG_SUSPEND for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { - if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) + if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { + error = pm_suspend(state); break; - } - if (state < PM_SUSPEND_MAX && *s) { - error = enter_state(state); - if (error) { - suspend_stats.fail++; - dpm_save_failed_errno(error); - } else - suspend_stats.success++; + } } #endif diff --git a/kernel/power/power.h b/kernel/power/power.h index 21724eee520..98f3622d740 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -177,13 +177,11 @@ extern const char *const pm_states[]; extern bool valid_state(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); -extern int enter_state(suspend_state_t state); #else /* !CONFIG_SUSPEND */ static inline int suspend_devices_and_enter(suspend_state_t state) { return -ENOSYS; } -static inline int enter_state(suspend_state_t state) { return -ENOSYS; } static inline bool valid_state(suspend_state_t state) { return false; } #endif /* !CONFIG_SUSPEND */ @@ -234,16 +232,14 @@ static inline int suspend_freeze_processes(void) int error; error = freeze_processes(); - /* * freeze_processes() automatically thaws every task if freezing * fails. So we need not do anything extra upon error. */ if (error) - goto Finish; + return error; error = freeze_kernel_threads(); - /* * freeze_kernel_threads() thaws only kernel threads upon freezing * failure. So we have to thaw the userspace tasks ourselves. @@ -251,7 +247,6 @@ static inline int suspend_freeze_processes(void) if (error) thaw_processes(); - Finish: return error; } diff --git a/kernel/power/process.c b/kernel/power/process.c index 7e426459e60..0d2aeb22610 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -53,11 +53,9 @@ static int try_to_freeze_tasks(bool user_only) * It is "frozen enough". If the task does wake * up, it will immediately call try_to_freeze. * - * Because freeze_task() goes through p's - * scheduler lock after setting TIF_FREEZE, it's - * guaranteed that either we see TASK_RUNNING or - * try_to_stop() after schedule() in ptrace/signal - * stop sees TIF_FREEZE. + * Because freeze_task() goes through p's scheduler lock, it's + * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING + * transition can't race with task state testing here. */ if (!task_is_stopped_or_traced(p) && !freezer_should_skip(p)) @@ -98,13 +96,15 @@ static int try_to_freeze_tasks(bool user_only) elapsed_csecs / 100, elapsed_csecs % 100, todo - wq_busy, wq_busy); - read_lock(&tasklist_lock); - do_each_thread(g, p) { - if (!wakeup && !freezer_should_skip(p) && - p != current && freezing(p) && !frozen(p)) - sched_show_task(p); - } while_each_thread(g, p); - read_unlock(&tasklist_lock); + if (!wakeup) { + read_lock(&tasklist_lock); + do_each_thread(g, p) { + if (p != current && !freezer_should_skip(p) + && freezing(p) && !frozen(p)) + sched_show_task(p); + } while_each_thread(g, p); + read_unlock(&tasklist_lock); + } } else { printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100, elapsed_csecs % 100); diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 995e3bd3417..d6d6dbd1ecc 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -469,21 +469,18 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf, static int __init pm_qos_power_init(void) { int ret = 0; + int i; - ret = register_pm_qos_misc(&cpu_dma_pm_qos); - if (ret < 0) { - printk(KERN_ERR "pm_qos_param: cpu_dma_latency setup failed\n"); - return ret; - } - ret = register_pm_qos_misc(&network_lat_pm_qos); - if (ret < 0) { - printk(KERN_ERR "pm_qos_param: network_latency setup failed\n"); - return ret; + BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES); + + for (i = 1; i < PM_QOS_NUM_CLASSES; i++) { + ret = register_pm_qos_misc(pm_qos_array[i]); + if (ret < 0) { + printk(KERN_ERR "pm_qos_param: %s setup failed\n", + pm_qos_array[i]->name); + return ret; + } } - ret = register_pm_qos_misc(&network_throughput_pm_qos); - if (ret < 0) - printk(KERN_ERR - "pm_qos_param: network_throughput setup failed\n"); return ret; } diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 3a564ac85f3..0de28576807 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -711,9 +711,10 @@ static void mark_nosave_pages(struct memory_bitmap *bm) list_for_each_entry(region, &nosave_regions, list) { unsigned long pfn; - pr_debug("PM: Marking nosave pages: %016lx - %016lx\n", - region->start_pfn << PAGE_SHIFT, - region->end_pfn << PAGE_SHIFT); + pr_debug("PM: Marking nosave pages: [mem %#010llx-%#010llx]\n", + (unsigned long long) region->start_pfn << PAGE_SHIFT, + ((unsigned long long) region->end_pfn << PAGE_SHIFT) + - 1); for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) if (pfn_valid(pfn)) { diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 4fd51beed87..88e5c967370 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -37,8 +37,8 @@ const char *const pm_states[PM_SUSPEND_MAX] = { static const struct platform_suspend_ops *suspend_ops; /** - * suspend_set_ops - Set the global suspend method table. - * @ops: Pointer to ops structure. + * suspend_set_ops - Set the global suspend method table. + * @ops: Suspend operations to use. */ void suspend_set_ops(const struct platform_suspend_ops *ops) { @@ -58,11 +58,11 @@ bool valid_state(suspend_state_t state) } /** - * suspend_valid_only_mem - generic memory-only valid callback + * suspend_valid_only_mem - Generic memory-only valid callback. * - * Platform drivers that implement mem suspend only and only need - * to check for that in their .valid callback can use this instead - * of rolling their own .valid callback. + * Platform drivers that implement mem suspend only and only need to check for + * that in their .valid() callback can use this instead of rolling their own + * .valid() callback. */ int suspend_valid_only_mem(suspend_state_t state) { @@ -83,10 +83,11 @@ static int suspend_test(int level) } /** - * suspend_prepare - Do prep work before entering low-power state. + * suspend_prepare - Prepare for entering system sleep state. * - * This is common code that is called for each state that we're entering. - * Run suspend notifiers, allocate a console and stop all processes. + * Common code run for every system sleep state that can be entered (except for + * hibernation). Run suspend notifiers, allocate the "suspend" console and + * freeze processes. */ static int suspend_prepare(void) { @@ -131,9 +132,9 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void) } /** - * suspend_enter - enter the desired system sleep state. - * @state: State to enter - * @wakeup: Returns information that suspend should not be entered again. + * suspend_enter - Make the system enter the given sleep state. + * @state: System sleep state to enter. + * @wakeup: Returns information that the sleep state should not be re-entered. * * This function should be called after devices have been suspended. */ @@ -147,7 +148,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) goto Platform_finish; } - error = dpm_suspend_noirq(PMSG_SUSPEND); + error = dpm_suspend_end(PMSG_SUSPEND); if (error) { printk(KERN_ERR "PM: Some devices failed to power down\n"); goto Platform_finish; @@ -189,7 +190,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) if (suspend_ops->wake) suspend_ops->wake(); - dpm_resume_noirq(PMSG_RESUME); + dpm_resume_start(PMSG_RESUME); Platform_finish: if (suspend_ops->finish) @@ -199,9 +200,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) } /** - * suspend_devices_and_enter - suspend devices and enter the desired system - * sleep state. - * @state: state to enter + * suspend_devices_and_enter - Suspend devices and enter system sleep state. + * @state: System sleep state to enter. */ int suspend_devices_and_enter(suspend_state_t state) { @@ -251,10 +251,10 @@ int suspend_devices_and_enter(suspend_state_t state) } /** - * suspend_finish - Do final work before exiting suspend sequence. + * suspend_finish - Clean up before finishing the suspend sequence. * - * Call platform code to clean up, restart processes, and free the - * console that we've allocated. This is not called for suspend-to-disk. + * Call platform code to clean up, restart processes, and free the console that + * we've allocated. This routine is not called for hibernation. */ static void suspend_finish(void) { @@ -265,16 +265,14 @@ static void suspend_finish(void) } /** - * enter_state - Do common work of entering low-power state. - * @state: pm_state structure for state we're entering. + * enter_state - Do common work needed to enter system sleep state. + * @state: System sleep state to enter. * - * Make sure we're the only ones trying to enter a sleep state. Fail - * if someone has beat us to it, since we don't want anything weird to - * happen when we wake up. - * Then, do the setup for suspend, enter the state, and cleaup (after - * we've woken up). + * Make sure that no one else is trying to put the system into a sleep state. + * Fail if that's not the case. Otherwise, prepare for system suspend, make the + * system enter the given sleep state and clean up after wakeup. */ -int enter_state(suspend_state_t state) +static int enter_state(suspend_state_t state) { int error; @@ -310,24 +308,26 @@ int enter_state(suspend_state_t state) } /** - * pm_suspend - Externally visible function for suspending system. - * @state: Enumerated value of state to enter. + * pm_suspend - Externally visible function for suspending the system. + * @state: System sleep state to enter. * - * Determine whether or not value is within range, get state - * structure, and enter (above). + * Check if the value of @state represents one of the supported states, + * execute enter_state() and update system suspend statistics. */ int pm_suspend(suspend_state_t state) { - int ret; - if (state > PM_SUSPEND_ON && state < PM_SUSPEND_MAX) { - ret = enter_state(state); - if (ret) { - suspend_stats.fail++; - dpm_save_failed_errno(ret); - } else - suspend_stats.success++; - return ret; + int error; + + if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) + return -EINVAL; + + error = enter_state(state); + if (error) { + suspend_stats.fail++; + dpm_save_failed_errno(error); + } else { + suspend_stats.success++; } - return -EINVAL; + return error; } EXPORT_SYMBOL(pm_suspend); diff --git a/kernel/power/user.c b/kernel/power/user.c index 3e100075b13..33c4329205a 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -249,16 +249,10 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, } pm_restore_gfp_mask(); error = hibernation_snapshot(data->platform_support); - if (error) { - thaw_kernel_threads(); - } else { + if (!error) { error = put_user(in_suspend, (int __user *)arg); - if (!error && !freezer_test_done) - data->ready = 1; - if (freezer_test_done) { - freezer_test_done = false; - thaw_kernel_threads(); - } + data->ready = !freezer_test_done && !error; + freezer_test_done = false; } break; |