diff options
Diffstat (limited to 'arch/powerpc/kernel/dbell.c')
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 57 |
1 files changed, 35 insertions, 22 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c index 1493734cd87..d55c76c571f 100644 --- a/arch/powerpc/kernel/dbell.c +++ b/arch/powerpc/kernel/dbell.c @@ -13,32 +13,45 @@ #include <linux/kernel.h> #include <linux/smp.h> #include <linux/threads.h> +#include <linux/hardirq.h> #include <asm/dbell.h> +#include <asm/irq_regs.h> #ifdef CONFIG_SMP -unsigned long dbell_smp_message[NR_CPUS]; +void doorbell_setup_this_cpu(void) +{ + unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK; + + smp_muxed_ipi_set_data(smp_processor_id(), tag); +} + +void doorbell_cause_ipi(int cpu, unsigned long data) +{ + /* Order previous accesses vs. msgsnd, which is treated as a store */ + mb(); + ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data); +} + +void doorbell_exception(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + irq_enter(); + + may_hard_irq_enable(); + + __get_cpu_var(irq_stat).doorbell_irqs++; -void smp_dbell_message_pass(int target, int msg) + smp_ipi_demux(); + + irq_exit(); + set_irq_regs(old_regs); +} +#else /* CONFIG_SMP */ +void doorbell_exception(struct pt_regs *regs) { - 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); - } + printk(KERN_WARNING "Received doorbell on non-smp system\n"); } -#endif +#endif /* CONFIG_SMP */ + |