diff options
| author | Keith Owens <kaos@sgi.com> | 2006-06-26 13:59:41 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 10:48:22 -0700 |
| commit | 45486f81c9aa07218b73a38cbcf62ffa66e99088 (patch) | |
| tree | 8fc03b93b941c6ba3131bb016fe126f2f95e3c86 | |
| parent | 9c63f8738734eb7e6d3f76ca03186f16ef88edf5 (diff) | |
[PATCH] x86_64: Standardize i386/x86_64 handling of NMI_VECTOR
x86_64 and i386 behave inconsistently when sending an IPI on vector 2
(NMI_VECTOR). Make both behave the same, so IPI 2 is sent as NMI.
The crash code was abusing send_IPI_allbutself() by passing a code
instead of a vector, it only worked because crash knew about the
internal code of send_IPI_allbutself(). Change crash to use NMI_VECTOR
instead, and remove the comment about how crash was abusing the function.
This patch is a pre-requisite for fixing the problem where sending an
IPI as NMI would reboot some Dell Xeon systems. I cannot fix that
problem while crash continus to abuse send_IPI_allbutself().
It also removes the inconsistency between i386 and x86_64 for
NMI_VECTOR. That will simplify all the RAS code that needs to bring
all the cpus to a clean stop, even when one or more cpus are spinning
disabled.
Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/i386/kernel/crash.c | 7 | ||||
| -rw-r--r-- | arch/i386/kernel/smp.c | 12 | ||||
| -rw-r--r-- | arch/x86_64/kernel/crash.c | 2 | ||||
| -rw-r--r-- | include/asm-i386/hw_irq.h | 2 |
4 files changed, 15 insertions, 8 deletions
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c index 21dc1bbb806..0c88d3ec8c1 100644 --- a/arch/i386/kernel/crash.c +++ b/arch/i386/kernel/crash.c @@ -120,14 +120,9 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu) return 1; } -/* - * By using the NMI code instead of a vector we just sneak thru the - * word generator coming out with just what we want. AND it does - * not matter if clustered_apic_mode is set or not. - */ static void smp_send_nmi_allbutself(void) { - send_IPI_allbutself(APIC_DM_NMI); + send_IPI_allbutself(NMI_VECTOR); } static void nmi_shootdown_cpus(void) diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c index d134e9643a5..c10789d7a9d 100644 --- a/arch/i386/kernel/smp.c +++ b/arch/i386/kernel/smp.c @@ -114,7 +114,17 @@ DEFINE_PER_CPU(struct tlb_state, cpu_tlbstate) ____cacheline_aligned = { &init_m static inline int __prepare_ICR (unsigned int shortcut, int vector) { - return APIC_DM_FIXED | shortcut | vector | APIC_DEST_LOGICAL; + unsigned int icr = shortcut | APIC_DEST_LOGICAL; + + switch (vector) { + default: + icr |= APIC_DM_FIXED | vector; + break; + case NMI_VECTOR: + icr |= APIC_DM_NMI; + break; + } + return icr; } static inline int __prepare_ICR2 (unsigned int mask) diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c index ec1c7431d5a..8ca04912b1c 100644 --- a/arch/x86_64/kernel/crash.c +++ b/arch/x86_64/kernel/crash.c @@ -118,7 +118,7 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu) static void smp_send_nmi_allbutself(void) { - send_IPI_allbutself(APIC_DM_NMI); + send_IPI_allbutself(NMI_VECTOR); } /* diff --git a/include/asm-i386/hw_irq.h b/include/asm-i386/hw_irq.h index 95d3fd09029..a4c0a5a9ffd 100644 --- a/include/asm-i386/hw_irq.h +++ b/include/asm-i386/hw_irq.h @@ -19,6 +19,8 @@ struct hw_interrupt_type; +#define NMI_VECTOR 0x02 + /* * Various low-level irq details needed by irq.c, process.c, * time.c, io_apic.c and smp.c |