3 files changed, 77 insertions, 5 deletions

diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
index 8ccea012722c..7544ce6b481a 100644
--- a/arch/arm/include/asm/pmu.h
+++ b/arch/arm/include/asm/pmu.h
@@ -12,11 +12,25 @@
 #ifndef __ARM_PMU_H__
 #define __ARM_PMU_H__
 
+#include <linux/interrupt.h>
+
 enum arm_pmu_type {
         ARM_PMU_DEVICE_CPU      = 0,
         ARM_NUM_PMU_DEVICES,
 };
 
+/*
+ * struct arm_pmu_platdata - ARM PMU platform data
+ *
+ * @handle_irq: an optional handler which will be called from the interrupt and
+ * passed the address of the low level handler, and can be used to implement
+ * any platform specific handling before or after calling it.
+ */
+struct arm_pmu_platdata {
+        irqreturn_t (*handle_irq)(int irq, void *dev,
+                                  irq_handler_t pmu_handler);
+};
+
 #ifdef CONFIG_CPU_HAS_PMU
 
 /**
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index d150ad1ccb5d..22e194eb8536 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -377,9 +377,18 @@ validate_group(struct perf_event *event)
         return 0;
 }
 
+static irqreturn_t armpmu_platform_irq(int irq, void *dev)
+{
+        struct arm_pmu_platdata *plat = dev_get_platdata(&pmu_device->dev);
+
+        return plat->handle_irq(irq, dev, armpmu->handle_irq);
+}
+
 static int
 armpmu_reserve_hardware(void)
 {
+        struct arm_pmu_platdata *plat;
+        irq_handler_t handle_irq;
         int i, err = -ENODEV, irq;
 
         pmu_device = reserve_pmu(ARM_PMU_DEVICE_CPU);
@@ -390,6 +399,12 @@ armpmu_reserve_hardware(void)
 
         init_pmu(ARM_PMU_DEVICE_CPU);
 
+        plat = dev_get_platdata(&pmu_device->dev);
+        if (plat && plat->handle_irq)
+                handle_irq = armpmu_platform_irq;
+        else
+                handle_irq = armpmu->handle_irq;
+
         if (pmu_device->num_resources < 1) {
                 pr_err("no irqs for PMUs defined\n");
                 return -ENODEV;
@@ -400,7 +415,7 @@ armpmu_reserve_hardware(void)
                 if (irq < 0)
                         continue;
 
-                err = request_irq(irq, armpmu->handle_irq,
+                err = request_irq(irq, handle_irq,
                                   IRQF_DISABLED | IRQF_NOBALANCING,
                                   "armpmu", NULL);
                 if (err) {
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 1748fbc58530..5c0fabf5fa01 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -12,22 +12,20 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/amba/bus.h>
+#include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 
 #include <asm/mach/map.h>
+#include <asm/pmu.h>
 #include <mach/hardware.h>
 #include <mach/setup.h>
 #include <mach/devices.h>
 
 #include "devices-db8500.h"
 
-static struct platform_device *platform_devs[] __initdata = {
-        &u8500_dma40_device,
-};
-
 /* minimum static i/o mapping required to boot U8500 platforms */
 static struct map_desc u8500_uart_io_desc[] __initdata = {
         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
@@ -89,6 +87,51 @@ void __init u8500_map_io(void)
                 iotable_init(u8500_v2_io_desc, ARRAY_SIZE(u8500_v2_io_desc));
 }
 
+static struct resource db8500_pmu_resources[] = {
+        [0] = {
+                .start          = IRQ_DB8500_PMU,
+                .end            = IRQ_DB8500_PMU,
+                .flags          = IORESOURCE_IRQ,
+        },
+};
+
+/*
+ * The PMU IRQ lines of two cores are wired together into a single interrupt.
+ * Bounce the interrupt to the other core if it's not ours.
+ */
+static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
+{
+        irqreturn_t ret = handler(irq, dev);
+        int other = !smp_processor_id();
+
+        if (ret == IRQ_NONE && cpu_online(other))
+                irq_set_affinity(irq, cpumask_of(other));
+
+        /*
+         * We should be able to get away with the amount of IRQ_NONEs we give,
+         * while still having the spurious IRQ detection code kick in if the
+         * interrupt really starts hitting spuriously.
+         */
+        return ret;
+}
+
+static struct arm_pmu_platdata db8500_pmu_platdata = {
+        .handle_irq             = db8500_pmu_handler,
+};
+
+static struct platform_device db8500_pmu_device = {
+        .name                   = "arm-pmu",
+        .id                     = ARM_PMU_DEVICE_CPU,
+        .num_resources          = ARRAY_SIZE(db8500_pmu_resources),
+        .resource               = db8500_pmu_resources,
+        .dev.platform_data      = &db8500_pmu_platdata,
+};
+
+static struct platform_device *platform_devs[] __initdata = {
+        &u8500_dma40_device,
+        &db8500_pmu_device,
+};
+
 static resource_size_t __initdata db8500_gpio_base[] = {
         U8500_GPIOBANK0_BASE,
         U8500_GPIOBANK1_BASE,