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| author | Kumar Gala <galak@kernel.crashing.org> | 2009-02-12 13:54:53 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-02-23 15:53:03 +1100 |
| commit | 620165f971753c2c451c880796bac7cd66f3534a (patch) | |
| tree | 1ec36dc067ff0af865f4f6954dbea84ef4205294 /arch/powerpc/kernel/traps.c | |
| parent | 6ed8d12849d651c646c108807754a544d2e506f1 (diff) | |
| download | linux-stable-620165f971753c2c451c880796bac7cd66f3534a.tar.gz linux-stable-620165f971753c2c451c880796bac7cd66f3534a.tar.bz2 linux-stable-620165f971753c2c451c880796bac7cd66f3534a.zip | |
powerpc: Add support for using doorbells for SMP IPI
The e500mc supports the new msgsnd/doorbell mechanisms that were added in
the Power ISA 2.05 architecture. We use the normal level doorbell for
doing SMP IPIs at this point.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/traps.c')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 970d66ec4657..678fbff0d206 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -53,6 +53,9 @@ #endif #include <asm/kexec.h> #include <asm/ppc-opcode.h> +#ifdef CONFIG_FSL_BOOKE +#include <asm/dbell.h> +#endif #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) int (*__debugger)(struct pt_regs *regs); @@ -1122,6 +1125,24 @@ void vsx_assist_exception(struct pt_regs *regs) #endif /* CONFIG_VSX */ #ifdef CONFIG_FSL_BOOKE + +void doorbell_exception(struct pt_regs *regs) +{ +#ifdef CONFIG_SMP + int cpu = smp_processor_id(); + int msg; + + if (num_online_cpus() < 2) + return; + + for (msg = 0; msg < 4; msg++) + if (test_and_clear_bit(msg, &dbell_smp_message[cpu])) + smp_message_recv(msg); +#else + printk(KERN_WARNING "Received doorbell on non-smp system\n"); +#endif +} + void CacheLockingException(struct pt_regs *regs, unsigned long address, unsigned long error_code) { |