projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * drivers/power/smp.c - Functions for stopping other CPUs. | |
| 3 | * | |
| 4 | * Copyright 2004 Pavel Machek <pavel@suse.cz> | |
| 5 | * Copyright (C) 2002-2003 Nigel Cunningham <ncunningham@clear.net.nz> | |
| 6 | * | |
| 7 | * This file is released under the GPLv2. | |
| 8 | */ | |
| 9 | ||
| 10 | #undef DEBUG | |
| 11 | ||
| 12 | #include <linux/smp_lock.h> | |
| 13 | #include <linux/interrupt.h> | |
| 14 | #include <linux/suspend.h> | |
| 15 | #include <linux/module.h> | |
| 5a72e04d | 16 | #include <linux/cpu.h> |
| 1da177e4 LT |
17 | #include <asm/atomic.h> |
| 18 | #include <asm/tlbflush.h> | |
| 19 | ||
| 5a72e04d LS |
20 | /* This is protected by pm_sem semaphore */ |
| 21 | static cpumask_t frozen_cpus; | |
| 1da177e4 LT |
22 | |
| 23 | void disable_nonboot_cpus(void) | |
| 24 | { | |
| 5a72e04d | 25 | int cpu, error; |
| 1da177e4 | 26 | |
| 5a72e04d LS |
27 | error = 0; |
| 28 | cpus_clear(frozen_cpus); | |
| 29 | printk("Freezing cpus ...\n"); | |
| 30 | for_each_online_cpu(cpu) { | |
| 31 | if (cpu == 0) | |
| 32 | continue; | |
| 33 | error = cpu_down(cpu); | |
| 34 | if (!error) { | |
| 35 | cpu_set(cpu, frozen_cpus); | |
| 36 | printk("CPU%d is down\n", cpu); | |
| 37 | continue; | |
| 38 | } | |
| 39 | printk("Error taking cpu %d down: %d\n", cpu, error); | |
| 1da177e4 | 40 | } |
| bba0e467 | 41 | BUG_ON(raw_smp_processor_id() != 0); |
| 5a72e04d LS |
42 | if (error) |
| 43 | panic("cpus not sleeping"); | |
| 1da177e4 LT |
44 | } |
| 45 | ||
| 46 | void enable_nonboot_cpus(void) | |
| 47 | { | |
| 5a72e04d | 48 | int cpu, error; |
| 1da177e4 | 49 | |
| 5a72e04d LS |
50 | printk("Thawing cpus ...\n"); |
| 51 | for_each_cpu_mask(cpu, frozen_cpus) { | |
| 52 | error = smp_prepare_cpu(cpu); | |
| 53 | if (!error) | |
| 54 | error = cpu_up(cpu); | |
| 55 | if (!error) { | |
| 56 | printk("CPU%d is up\n", cpu); | |
| 57 | continue; | |
| 58 | } | |
| 59 | printk("Error taking cpu %d up: %d\n", cpu, error); | |
| 60 | panic("Not enough cpus"); | |
| 61 | } | |
| 62 | cpus_clear(frozen_cpus); | |
| 1da177e4 LT |
63 | } |
| 64 |