diff options
author | Ingo Molnar <mingo@elte.hu> | 2010-08-31 09:45:21 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2010-08-31 09:45:46 +0200 |
commit | daab7fc734a53fdeaf844b7c03053118ad1769da (patch) | |
tree | 575deb3cdcc6dda562acaed6f7c29bc81ae01cf2 /arch/powerpc/kernel/dbell.c | |
parent | 774ea0bcb27f57b6fd521b3b6c43237782fed4b9 (diff) | |
parent | 2bfc96a127bc1cc94d26bfaa40159966064f9c8c (diff) | |
download | op-kernel-dev-daab7fc734a53fdeaf844b7c03053118ad1769da.zip op-kernel-dev-daab7fc734a53fdeaf844b7c03053118ad1769da.tar.gz |
Merge commit 'v2.6.36-rc3' into x86/memblock
Conflicts:
arch/x86/kernel/trampoline.c
mm/memblock.c
Merge reason: Resolve the conflicts, update to latest upstream.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/powerpc/kernel/dbell.c')
-rw-r--r-- | arch/powerpc/kernel/dbell.c | 78 |
1 files changed, 67 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c index 1493734..3307a52 100644 --- a/arch/powerpc/kernel/dbell.c +++ b/arch/powerpc/kernel/dbell.c @@ -13,32 +13,88 @@ #include <linux/kernel.h> #include <linux/smp.h> #include <linux/threads.h> +#include <linux/percpu.h> #include <asm/dbell.h> +#include <asm/irq_regs.h> #ifdef CONFIG_SMP -unsigned long dbell_smp_message[NR_CPUS]; +struct doorbell_cpu_info { + unsigned long messages; /* current messages bits */ + unsigned int tag; /* tag value */ +}; -void smp_dbell_message_pass(int target, int msg) +static DEFINE_PER_CPU(struct doorbell_cpu_info, doorbell_cpu_info); + +void doorbell_setup_this_cpu(void) +{ + struct doorbell_cpu_info *info = &__get_cpu_var(doorbell_cpu_info); + + info->messages = 0; + info->tag = mfspr(SPRN_PIR) & 0x3fff; +} + +void doorbell_message_pass(int target, int msg) { + struct doorbell_cpu_info *info; int i; - if(target < NR_CPUS) { - set_bit(msg, &dbell_smp_message[target]); - ppc_msgsnd(PPC_DBELL, 0, target); + if (target < NR_CPUS) { + info = &per_cpu(doorbell_cpu_info, target); + set_bit(msg, &info->messages); + ppc_msgsnd(PPC_DBELL, 0, info->tag); } - else if(target == MSG_ALL_BUT_SELF) { + 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); + info = &per_cpu(doorbell_cpu_info, i); + set_bit(msg, &info->messages); + ppc_msgsnd(PPC_DBELL, 0, info->tag); } } else { /* target == MSG_ALL */ - for_each_online_cpu(i) - set_bit(msg, &dbell_smp_message[i]); + for_each_online_cpu(i) { + info = &per_cpu(doorbell_cpu_info, i); + set_bit(msg, &info->messages); + } ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0); } } -#endif + +void doorbell_exception(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + struct doorbell_cpu_info *info = &__get_cpu_var(doorbell_cpu_info); + int msg; + + /* Warning: regs can be NULL when called from irq enable */ + + if (!info->messages || (num_online_cpus() < 2)) + goto out; + + for (msg = 0; msg < 4; msg++) + if (test_and_clear_bit(msg, &info->messages)) + smp_message_recv(msg); + +out: + set_irq_regs(old_regs); +} + +void doorbell_check_self(void) +{ + struct doorbell_cpu_info *info = &__get_cpu_var(doorbell_cpu_info); + + if (!info->messages) + return; + + ppc_msgsnd(PPC_DBELL, 0, info->tag); +} + +#else /* CONFIG_SMP */ +void doorbell_exception(struct pt_regs *regs) +{ + printk(KERN_WARNING "Received doorbell on non-smp system\n"); +} +#endif /* CONFIG_SMP */ + |