diff options
| 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/dbell.c | |
| parent | 6ed8d12849d651c646c108807754a544d2e506f1 (diff) | |
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/dbell.c')
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c new file mode 100644 index 00000000000..1493734cd87 --- /dev/null +++ b/arch/powerpc/kernel/dbell.c @@ -0,0 +1,44 @@ +/* + * Author: Kumar Gala <galak@kernel.crashing.org> + * + * Copyright 2009 Freescale Semiconductor Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/threads.h> + +#include <asm/dbell.h> + +#ifdef CONFIG_SMP +unsigned long dbell_smp_message[NR_CPUS]; + +void smp_dbell_message_pass(int target, int msg) +{ + int i; + + if(target < NR_CPUS) { + set_bit(msg, &dbell_smp_message[target]); + ppc_msgsnd(PPC_DBELL, 0, target); + } + else if(target == MSG_ALL_BUT_SELF) { + for_each_online_cpu(i) { + if (i == smp_processor_id()) + continue; + set_bit(msg, &dbell_smp_message[i]); + ppc_msgsnd(PPC_DBELL, 0, i); + } + } + else { /* target == MSG_ALL */ + for_each_online_cpu(i) + set_bit(msg, &dbell_smp_message[i]); + ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0); + } +} +#endif |