projects / deliverable / 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> | |
| 7aa1c8f4 RB |
8 | #include <linux/irq.h> |
| 9 | #include <linux/types.h> | |
| 10 | #include <linux/sched.h> | |
| 11 | ||
| 12 | /* This keeps a track of which one is crashing cpu. */ | |
| 13 | static int crashing_cpu = -1; | |
| 14 | static cpumask_t cpus_in_crash = CPU_MASK_NONE; | |
| 15 | ||
| 16 | #ifdef CONFIG_SMP | |
| c80e1b62 | 17 | static void crash_shutdown_secondary(void *passed_regs) |
| 7aa1c8f4 | 18 | { |
| c80e1b62 | 19 | struct pt_regs *regs = passed_regs; |
| 7aa1c8f4 RB |
20 | int cpu = smp_processor_id(); |
| 21 | ||
| c80e1b62 CM |
22 | /* |
| 23 | * If we are passed registers, use those. Otherwise get the | |
| 24 | * regs from the last interrupt, which should be correct, as | |
| 25 | * we are in an interrupt. But if the regs are not there, | |
| 26 | * pull them from the top of the stack. They are probably | |
| 27 | * wrong, but we need something to keep from crashing again. | |
| 28 | */ | |
| 29 | if (!regs) | |
| 30 | regs = get_irq_regs(); | |
| 31 | if (!regs) | |
| 32 | regs = task_pt_regs(current); | |
| 7aa1c8f4 RB |
33 | |
| 34 | if (!cpu_online(cpu)) | |
| 35 | return; | |
| 36 | ||
| 37 | local_irq_disable(); | |
| 8dd92891 | 38 | if (!cpumask_test_cpu(cpu, &cpus_in_crash)) |
| 7aa1c8f4 | 39 | crash_save_cpu(regs, cpu); |
| 8dd92891 | 40 | cpumask_set_cpu(cpu, &cpus_in_crash); |
| 7aa1c8f4 RB |
41 | |
| 42 | while (!atomic_read(&kexec_ready_to_reboot)) | |
| 43 | cpu_relax(); | |
| 44 | relocated_kexec_smp_wait(NULL); | |
| 45 | /* NOTREACHED */ | |
| 46 | } | |
| 47 | ||
| 48 | static void crash_kexec_prepare_cpus(void) | |
| 49 | { | |
| 50 | unsigned int msecs; | |
| 51 | ||
| 52 | unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ | |
| 53 | ||
| 54 | dump_send_ipi(crash_shutdown_secondary); | |
| 55 | smp_wmb(); | |
| 56 | ||
| 57 | /* | |
| 58 | * The crash CPU sends an IPI and wait for other CPUs to | |
| 59 | * respond. Delay of at least 10 seconds. | |
| 60 | */ | |
| 61 | pr_emerg("Sending IPI to other cpus...\n"); | |
| 62 | msecs = 10000; | |
| 8dd92891 | 63 | while ((cpumask_weight(&cpus_in_crash) < ncpus) && (--msecs > 0)) { |
| 7aa1c8f4 RB |
64 | cpu_relax(); |
| 65 | mdelay(1); | |
| 66 | } | |
| 67 | } | |
| 68 | ||
| 69 | #else /* !defined(CONFIG_SMP) */ | |
| 70 | static void crash_kexec_prepare_cpus(void) {} | |
| 70342287 | 71 | #endif /* !defined(CONFIG_SMP) */ |
| 7aa1c8f4 RB |
72 | |
| 73 | void default_machine_crash_shutdown(struct pt_regs *regs) | |
| 74 | { | |
| 75 | local_irq_disable(); | |
| 76 | crashing_cpu = smp_processor_id(); | |
| 77 | crash_save_cpu(regs, crashing_cpu); | |
| 78 | crash_kexec_prepare_cpus(); | |
| 8dd92891 | 79 | cpumask_set_cpu(crashing_cpu, &cpus_in_crash); |
| 7aa1c8f4 | 80 | } |