17 files changed, 126 insertions, 176 deletions

diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h
index 3269eb49640a..9c70d0ca96d4 100644
--- a/arch/powerpc/include/asm/dbell.h
+++ b/arch/powerpc/include/asm/dbell.h
@@ -27,9 +27,8 @@ enum ppc_dbell {
         PPC_G_DBELL_MC = 4,     /* guest mcheck doorbell */
 };
 
-extern void doorbell_message_pass(int cpu, int msg);
+extern void doorbell_cause_ipi(int cpu, unsigned long data);
 extern void doorbell_exception(struct pt_regs *regs);
-extern void doorbell_check_self(void);
 extern void doorbell_setup_this_cpu(void);
 
 static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index 6f7c95c0027a..26f861560c51 100644
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -20,6 +20,7 @@
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/kernel.h>
+#include <linux/irqreturn.h>
 
 #ifndef __ASSEMBLY__
 
@@ -37,6 +38,7 @@ extern void cpu_die(void);
 
 struct smp_ops_t {
         void  (*message_pass)(int cpu, int msg);
+        void  (*cause_ipi)(int cpu, unsigned long data);
         int   (*probe)(void);
         int   (*kick_cpu)(int nr);
         void  (*setup_cpu)(int nr);
@@ -49,7 +51,6 @@ struct smp_ops_t {
 };
 
 extern void smp_send_debugger_break(void);
-extern void smp_message_recv(int);
 extern void start_secondary_resume(void);
 extern void __devinit smp_generic_give_timebase(void);
 extern void __devinit smp_generic_take_timebase(void);
@@ -109,13 +110,16 @@ extern int cpu_to_core_id(int cpu);
 #define PPC_MSG_CALL_FUNC_SINGLE        2
 #define PPC_MSG_DEBUGGER_BREAK  3
 
-/*
- * irq controllers that have dedicated ipis per message and don't
- * need additional code in the action handler may use this
- */
+/* for irq controllers that have dedicated ipis per message (4) */
 extern int smp_request_message_ipi(int virq, int message);
 extern const char *smp_ipi_name[];
 
+/* for irq controllers with only a single ipi */
+extern void smp_muxed_ipi_set_data(int cpu, unsigned long data);
+extern void smp_muxed_ipi_message_pass(int cpu, int msg);
+extern void smp_muxed_ipi_resend(void);
+extern irqreturn_t smp_ipi_demux(void);
+
 void smp_init_iSeries(void);
 void smp_init_pSeries(void);
 void smp_init_cell(void);
@@ -185,6 +189,8 @@ extern unsigned long __secondary_hold_spinloop;
 extern unsigned long __secondary_hold_acknowledge;
 extern char __secondary_hold;
 
+extern irqreturn_t debug_ipi_action(int irq, void *data);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */
diff --git a/arch/powerpc/include/asm/xics.h b/arch/powerpc/include/asm/xics.h
index 1750c8dae1fa..b183a4062011 100644
--- a/arch/powerpc/include/asm/xics.h
+++ b/arch/powerpc/include/asm/xics.h
@@ -40,7 +40,7 @@ struct icp_ops {
         void (*teardown_cpu)(void);
         void (*flush_ipi)(void);
 #ifdef CONFIG_SMP
-        void (*message_pass)(int cpu, int msg);
+        void (*cause_ipi)(int cpu, unsigned long data);
         irq_handler_t ipi_action;
 #endif
 };
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
index e49b24c84133..2cc451aaaca7 100644
--- a/arch/powerpc/kernel/dbell.c
+++ b/arch/powerpc/kernel/dbell.c
@@ -13,65 +13,35 @@
 #include <linux/kernel.h>
 #include <linux/smp.h>
 #include <linux/threads.h>
-#include <linux/percpu.h>
+#include <linux/hardirq.h>
 
 #include <asm/dbell.h>
 #include <asm/irq_regs.h>
 
 #ifdef CONFIG_SMP
-struct doorbell_cpu_info {
-        unsigned long   messages;       /* current messages bits */
-        unsigned int    tag;            /* tag value */
-};
-
-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);
+        unsigned long tag = mfspr(SPRN_PIR) & 0x3fff;
 
-        info->messages = 0;
-        info->tag = mfspr(SPRN_PIR) & 0x3fff;
+        smp_muxed_ipi_set_data(smp_processor_id(), tag);
 }
 
-void doorbell_message_pass(int cpu, int msg)
+void doorbell_cause_ipi(int cpu, unsigned long data)
 {
-        struct doorbell_cpu_info *info;
-
-        info = &per_cpu(doorbell_cpu_info, cpu);
-        set_bit(msg, &info->messages);
-        ppc_msgsnd(PPC_DBELL, 0, info->tag);
+        ppc_msgsnd(PPC_DBELL, 0, data);
 }
 
 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 */
+        irq_enter();
 
-        if (!info->messages || (num_online_cpus() < 2))
-                goto out;
+        smp_ipi_demux();
 
-        for (msg = 0; msg < 4; msg++)
-                if (test_and_clear_bit(msg, &info->messages))
-                        smp_message_recv(msg);
-
-out:
+        irq_exit();
         set_irq_regs(old_regs);
 }