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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>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
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* kexec.h for kexec
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* Created by <nschichan@corp.free.fr> on Thu Oct 12 14:59:34 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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#ifndef _MIPS_KEXEC
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# define _MIPS_KEXEC
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#include <asm/stacktrace.h>
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
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/* Reserve 3*4096 bytes for board-specific info */
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#define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_MIPS
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#define MAX_NOTE_BYTES 1024
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs)
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memcpy(newregs, oldregs, sizeof(*newregs));
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else
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prepare_frametrace(newregs);
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}
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#ifdef CONFIG_KEXEC
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struct kimage;
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extern unsigned long kexec_args[4];
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extern int (*_machine_kexec_prepare)(struct kimage *);
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extern void (*_machine_kexec_shutdown)(void);
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extern void (*_machine_crash_shutdown)(struct pt_regs *regs);
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extern void default_machine_crash_shutdown(struct pt_regs *regs);
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#ifdef CONFIG_SMP
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extern const unsigned char kexec_smp_wait[];
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extern unsigned long secondary_kexec_args[4];
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extern void (*relocated_kexec_smp_wait) (void *);
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extern atomic_t kexec_ready_to_reboot;
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extern void (*_crash_smp_send_stop)(void);
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#endif
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#endif
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#endif /* !_MIPS_KEXEC */
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