projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7aa1c8f4 RB |
1 | #include <linux/kernel.h> |
| 2 | #include <linux/smp.h> | |
| 3 | #include <linux/reboot.h> | |
| 4 | #include <linux/kexec.h> | |
| 5 | #include <linux/bootmem.h> | |
| 6 | #include <linux/crash_dump.h> | |
| 7 | #include <linux/delay.h> | |
| 8 | #include <linux/init.h> | |
| 9 | #include <linux/irq.h> | |
| 10 | #include <linux/types.h> | |
| 11 | #include <linux/sched.h> | |
| 12 | ||
| 13 | /* This keeps a track of which one is crashing cpu. */ | |
| 14 | static int crashing_cpu = -1; | |
| 15 | static cpumask_t cpus_in_crash = CPU_MASK_NONE; | |
| 16 | ||
| 17 | #ifdef CONFIG_SMP | |
| 18 | static void crash_shutdown_secondary(void *ignore) | |
| 19 | { | |
| 20 | struct pt_regs *regs; | |
| 21 | int cpu = smp_processor_id(); | |
| 22 | ||
| 23 | regs = task_pt_regs(current); | |
| 24 | ||
| 25 | if (!cpu_online(cpu)) | |
| 26 | return; | |
| 27 | ||
| 28 | local_irq_disable(); | |
| 29 | if (!cpu_isset(cpu, cpus_in_crash)) | |
| 30 | crash_save_cpu(regs, cpu); | |
| 31 | cpu_set(cpu, cpus_in_crash); | |
| 32 | ||
| 33 | while (!atomic_read(&kexec_ready_to_reboot)) | |
| 34 | cpu_relax(); | |
| 35 | relocated_kexec_smp_wait(NULL); | |
| 36 | /* NOTREACHED */ | |
| 37 | } | |
| 38 | ||
| 39 | static void crash_kexec_prepare_cpus(void) | |
| 40 | { | |
| 41 | unsigned int msecs; | |
| 42 | ||
| 43 | unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ | |
| 44 | ||
| 45 | dump_send_ipi(crash_shutdown_secondary); | |
| 46 | smp_wmb(); | |
| 47 | ||
| 48 | /* | |
| 49 | * The crash CPU sends an IPI and wait for other CPUs to | |
| 50 | * respond. Delay of at least 10 seconds. | |
| 51 | */ | |
| 52 | pr_emerg("Sending IPI to other cpus...\n"); | |
| 53 | msecs = 10000; | |
| 54 | while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) { | |
| 55 | cpu_relax(); | |
| 56 | mdelay(1); | |
| 57 | } | |
| 58 | } | |
| 59 | ||
| 60 | #else /* !defined(CONFIG_SMP) */ | |
| 61 | static void crash_kexec_prepare_cpus(void) {} | |
| 70342287 | 62 | #endif /* !defined(CONFIG_SMP) */ |
| 7aa1c8f4 RB |
63 | |
| 64 | void default_machine_crash_shutdown(struct pt_regs *regs) | |
| 65 | { | |
| 66 | local_irq_disable(); | |
| 67 | crashing_cpu = smp_processor_id(); | |
| 68 | crash_save_cpu(regs, crashing_cpu); | |
| 69 | crash_kexec_prepare_cpus(); | |
| 70 | cpu_set(crashing_cpu, cpus_in_crash); | |
| 71 | } |