Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (79 commits)
  powerpc/8xx: Add support for the MPC8xx based boards from TQC
  powerpc/85xx: Introduce support for the Freescale P1022DS reference board
  powerpc/85xx: Adding DTS for the STx GP3-SSA MPC8555 board
  powerpc/85xx: Change deprecated binding for 85xx-based boards
  powerpc/tqm85xx: add a quirk for ti1520 PCMCIA bridge
  powerpc/tqm85xx: update PCI interrupt-map attribute
  powerpc/mpc8308rdb: support for MPC8308RDB board from Freescale
  powerpc/fsl_pci: add quirk for mpc8308 pcie bridge
  powerpc/85xx: Cleanup QE initialization for MPC85xxMDS boards
  powerpc/85xx: Fix booting for P1021MDS boards
  powerpc/85xx: Fix SWIOTLB initalization for MPC85xxMDS boards
  powerpc/85xx: kexec for SMP 85xx BookE systems
  powerpc/5200/i2c: improve i2c bus error recovery
  of/xilinxfb: update tft compatible versions
  powerpc/fsl-diu-fb: Support setting display mode using EDID
  powerpc/5121: doc/dts-bindings: update doc of FSL DIU bindings
  powerpc/5121: shared DIU framebuffer support
  powerpc/5121: move fsl-diu-fb.h to include/linux
  powerpc/5121: fsl-diu-fb: fix issue with re-enabling DIU area descriptor
  powerpc/512x: add clock structure for Video-IN (VIU) unit
  ...

1 files changed, 67 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
index 1493734cd871..3307a52d797f 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 */
+