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[ralf@linux-mips.org: Original patch by Maxim Uvarov <muvarov@gmail.com> with plenty of further shining, polishing, debugging and testing by me.] Signed-off-by: Maxim Uvarov <muvarov@gmail.com> Cc: linux-mips@linux-mips.org Cc: kexec@lists.infradead.org Cc: horms@verge.net.au Patchwork: https://patchwork.linux-mips.org/patch/1025/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| #include <linux/kernel.h> | ||
| #include <linux/smp.h> | ||
| #include <linux/reboot.h> | ||
| #include <linux/kexec.h> | ||
| #include <linux/bootmem.h> | ||
| #include <linux/crash_dump.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/init.h> | ||
| #include <linux/irq.h> | ||
| #include <linux/types.h> | ||
| #include <linux/sched.h> | ||
|
|
||
| /* This keeps a track of which one is crashing cpu. */ | ||
| static int crashing_cpu = -1; | ||
| static cpumask_t cpus_in_crash = CPU_MASK_NONE; | ||
|
|
||
| #ifdef CONFIG_SMP | ||
| static void crash_shutdown_secondary(void *ignore) | ||
| { | ||
| struct pt_regs *regs; | ||
| int cpu = smp_processor_id(); | ||
|
|
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| regs = task_pt_regs(current); | ||
|
|
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| if (!cpu_online(cpu)) | ||
| return; | ||
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| local_irq_disable(); | ||
| if (!cpu_isset(cpu, cpus_in_crash)) | ||
| crash_save_cpu(regs, cpu); | ||
| cpu_set(cpu, cpus_in_crash); | ||
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||
| while (!atomic_read(&kexec_ready_to_reboot)) | ||
| cpu_relax(); | ||
| relocated_kexec_smp_wait(NULL); | ||
| /* NOTREACHED */ | ||
| } | ||
|
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||
| static void crash_kexec_prepare_cpus(void) | ||
| { | ||
| unsigned int msecs; | ||
|
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| unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */ | ||
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| dump_send_ipi(crash_shutdown_secondary); | ||
| smp_wmb(); | ||
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| /* | ||
| * The crash CPU sends an IPI and wait for other CPUs to | ||
| * respond. Delay of at least 10 seconds. | ||
| */ | ||
| pr_emerg("Sending IPI to other cpus...\n"); | ||
| msecs = 10000; | ||
| while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) { | ||
| cpu_relax(); | ||
| mdelay(1); | ||
| } | ||
| } | ||
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| #else /* !defined(CONFIG_SMP) */ | ||
| static void crash_kexec_prepare_cpus(void) {} | ||
| #endif /* !defined(CONFIG_SMP) */ | ||
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| void default_machine_crash_shutdown(struct pt_regs *regs) | ||
| { | ||
| local_irq_disable(); | ||
| crashing_cpu = smp_processor_id(); | ||
| crash_save_cpu(regs, crashing_cpu); | ||
| crash_kexec_prepare_cpus(); | ||
| cpu_set(crashing_cpu, cpus_in_crash); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| #include <linux/highmem.h> | ||
| #include <linux/bootmem.h> | ||
| #include <linux/crash_dump.h> | ||
| #include <asm/uaccess.h> | ||
|
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| unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; | ||
|
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| static int __init parse_savemaxmem(char *p) | ||
| { | ||
| if (p) | ||
| saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1; | ||
|
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| return 1; | ||
| } | ||
| __setup("savemaxmem=", parse_savemaxmem); | ||
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| static void *kdump_buf_page; | ||
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| /** | ||
| * copy_oldmem_page - copy one page from "oldmem" | ||
| * @pfn: page frame number to be copied | ||
| * @buf: target memory address for the copy; this can be in kernel address | ||
| * space or user address space (see @userbuf) | ||
| * @csize: number of bytes to copy | ||
| * @offset: offset in bytes into the page (based on pfn) to begin the copy | ||
| * @userbuf: if set, @buf is in user address space, use copy_to_user(), | ||
| * otherwise @buf is in kernel address space, use memcpy(). | ||
| * | ||
| * Copy a page from "oldmem". For this page, there is no pte mapped | ||
| * in the current kernel. | ||
| * | ||
| * Calling copy_to_user() in atomic context is not desirable. Hence first | ||
| * copying the data to a pre-allocated kernel page and then copying to user | ||
| * space in non-atomic context. | ||
| */ | ||
| ssize_t copy_oldmem_page(unsigned long pfn, char *buf, | ||
| size_t csize, unsigned long offset, int userbuf) | ||
| { | ||
| void *vaddr; | ||
|
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| if (!csize) | ||
| return 0; | ||
|
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| vaddr = kmap_atomic_pfn(pfn); | ||
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| if (!userbuf) { | ||
| memcpy(buf, (vaddr + offset), csize); | ||
| kunmap_atomic(vaddr); | ||
| } else { | ||
| if (!kdump_buf_page) { | ||
| pr_warning("Kdump: Kdump buffer page not allocated\n"); | ||
|
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| return -EFAULT; | ||
| } | ||
| copy_page(kdump_buf_page, vaddr); | ||
| kunmap_atomic(vaddr); | ||
| if (copy_to_user(buf, (kdump_buf_page + offset), csize)) | ||
| return -EFAULT; | ||
| } | ||
|
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| return csize; | ||
| } | ||
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| static int __init kdump_buf_page_init(void) | ||
| { | ||
| int ret = 0; | ||
|
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| kdump_buf_page = kmalloc(PAGE_SIZE, GFP_KERNEL); | ||
| if (!kdump_buf_page) { | ||
| pr_warning("Kdump: Failed to allocate kdump buffer page\n"); | ||
| ret = -ENOMEM; | ||
| } | ||
|
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| return ret; | ||
| } | ||
| arch_initcall(kdump_buf_page_init); |
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