From 620165f971753c2c451c880796bac7cd66f3534a Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Thu, 12 Feb 2009 13:54:53 +0000 Subject: 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/dbell.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 arch/powerpc/kernel/dbell.c (limited to 'arch/powerpc/kernel/dbell.c') diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c new file mode 100644 index 000000000000..1493734cd871 --- /dev/null +++ b/arch/powerpc/kernel/dbell.c @@ -0,0 +1,44 @@ +/* + * Author: Kumar Gala + * + * 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 +#include +#include +#include + +#include + +#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 -- cgit v1.2.3