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54c721b857
Daniel Walker reported problems which happens when
crash_kexec_post_notifiers kernel option is enabled
(https://lkml.org/lkml/2015/6/24/44).
In that case, smp_send_stop() is called before entering kdump routines
which assume other CPUs are still online. As the result, kdump
routines fail to save other CPUs' registers. Additionally for MIPS
OCTEON, it misses to stop the watchdog timer.
To fix this problem, call a new kdump friendly function,
crash_smp_send_stop(), instead of the smp_send_stop() when
crash_kexec_post_notifiers is enabled. crash_smp_send_stop() is a
weak function, and it just call smp_send_stop(). Architecture
codes should override it so that kdump can work appropriately.
This patch provides MIPS version.
Fixes: f06e5153f4 (kernel/panic.c: add "crash_kexec_post_notifiers" option)
Link: http://lkml.kernel.org/r/20160810080950.11028.28000.stgit@sysi4-13.yrl.intra.hitachi.co.jp
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Reported-by: Daniel Walker <dwalker@fifo99.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Daniel Walker <dwalker@fifo99.com>
Cc: Xunlei Pang <xpang@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Daney <david.daney@cavium.com>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: "Steven J. Hill" <steven.hill@cavium.com>
Cc: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/*
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* machine_kexec.c for kexec
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* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/compiler.h>
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#include <linux/kexec.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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extern const unsigned char relocate_new_kernel[];
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extern const size_t relocate_new_kernel_size;
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extern unsigned long kexec_start_address;
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extern unsigned long kexec_indirection_page;
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int (*_machine_kexec_prepare)(struct kimage *) = NULL;
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void (*_machine_kexec_shutdown)(void) = NULL;
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void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
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#ifdef CONFIG_SMP
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void (*relocated_kexec_smp_wait) (void *);
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atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
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void (*_crash_smp_send_stop)(void) = NULL;
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#endif
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int
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machine_kexec_prepare(struct kimage *kimage)
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{
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if (_machine_kexec_prepare)
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return _machine_kexec_prepare(kimage);
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return 0;
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}
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void
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machine_kexec_cleanup(struct kimage *kimage)
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{
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}
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void
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machine_shutdown(void)
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{
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if (_machine_kexec_shutdown)
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_machine_kexec_shutdown();
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}
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void
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machine_crash_shutdown(struct pt_regs *regs)
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{
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if (_machine_crash_shutdown)
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_machine_crash_shutdown(regs);
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else
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default_machine_crash_shutdown(regs);
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}
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typedef void (*noretfun_t)(void) __noreturn;
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void
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machine_kexec(struct kimage *image)
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{
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unsigned long reboot_code_buffer;
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unsigned long entry;
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unsigned long *ptr;
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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kexec_start_address =
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(unsigned long) phys_to_virt(image->start);
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if (image->type == KEXEC_TYPE_DEFAULT) {
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kexec_indirection_page =
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(unsigned long) phys_to_virt(image->head & PAGE_MASK);
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} else {
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kexec_indirection_page = (unsigned long)&image->head;
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}
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memcpy((void*)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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/*
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* The generic kexec code builds a page list with physical
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* addresses. they are directly accessible through KSEG0 (or
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* CKSEG0 or XPHYS if on 64bit system), hence the
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* phys_to_virt() call.
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*/
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for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
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ptr = (entry & IND_INDIRECTION) ?
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phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
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if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
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*ptr & IND_DESTINATION)
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*ptr = (unsigned long) phys_to_virt(*ptr);
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}
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/*
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* we do not want to be bothered.
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*/
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local_irq_disable();
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printk("Will call new kernel at %08lx\n", image->start);
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printk("Bye ...\n");
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__flush_cache_all();
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#ifdef CONFIG_SMP
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/* All secondary cpus now may jump to kexec_wait cycle */
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relocated_kexec_smp_wait = reboot_code_buffer +
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(void *)(kexec_smp_wait - relocate_new_kernel);
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smp_wmb();
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atomic_set(&kexec_ready_to_reboot, 1);
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#endif
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((noretfun_t) reboot_code_buffer)();
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}
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