Merge branch 'for-rmk/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/virt

* 'for-rmk/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
ARM: perf: simplify __hw_perf_event_init err handling
ARM: perf: remove unnecessary checks for idx < 0
ARM: perf: handle armpmu_register failing
ARM: perf: don't pretend to support counting of L1I writes
ARM: perf: remove redundant NULL check on cpu_pmu
ARM: Use implementor and part defines from cputype.h
ARM: Define CPU part numbers and implementors

arch/arm/include/asm/cputype.h

···
 #define read_cpuid_ext(reg) 0
 #endif
 
+#define ARM_CPU_IMP_ARM			0x41
+#define ARM_CPU_IMP_INTEL		0x69
+
+#define ARM_CPU_PART_ARM1136		0xB360
+#define ARM_CPU_PART_ARM1156		0xB560
+#define ARM_CPU_PART_ARM1176		0xB760
+#define ARM_CPU_PART_ARM11MPCORE	0xB020
+#define ARM_CPU_PART_CORTEX_A8		0xC080
+#define ARM_CPU_PART_CORTEX_A9		0xC090
+#define ARM_CPU_PART_CORTEX_A5		0xC050
+#define ARM_CPU_PART_CORTEX_A15		0xC0F0
+#define ARM_CPU_PART_CORTEX_A7		0xC070
+
+#define ARM_CPU_XSCALE_ARCH_MASK	0xe000
+#define ARM_CPU_XSCALE_ARCH_V1		0x2000
+#define ARM_CPU_XSCALE_ARCH_V2		0x4000
+#define ARM_CPU_XSCALE_ARCH_V3		0x6000
+
 /*
  * The CPU ID never changes at run time, so we might as well tell the
  * compiler that it's constant.  Use this function to read the CPU ID
···
 static inline unsigned int __attribute_const__ read_cpuid_id(void)
 {
 	return read_cpuid(CPUID_ID);
+}
+
+static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
+{
+	return (read_cpuid_id() & 0xFF000000) >> 24;
+}
+
+static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
+{
+	return read_cpuid_id() & 0xFFF0;
+}
+
+static inline unsigned int __attribute_const__ xscale_cpu_arch_version(void)
+{
+	return read_cpuid_part_number() & ARM_CPU_XSCALE_ARCH_MASK;
 }
 
 static inline unsigned int __attribute_const__ read_cpuid_cachetype(void)

arch/arm/kernel/perf_event.c

···
 static void
 armpmu_read(struct perf_event *event)
 {
-	struct hw_perf_event *hwc = &event->hw;
-
-	/* Don't read disabled counters! */
-	if (hwc->idx < 0)
-		return;
-
 	armpmu_event_update(event);
 }
 
···
 	struct pmu_hw_events *hw_events = armpmu->get_hw_events();
 	struct hw_perf_event *hwc = &event->hw;
 	int idx = hwc->idx;
-
-	WARN_ON(idx < 0);
 
 	armpmu_stop(event, PERF_EF_UPDATE);
 	hw_events->events[idx] = NULL;
···
 {
 	struct arm_pmu *armpmu = to_arm_pmu(event->pmu);
 	struct hw_perf_event *hwc = &event->hw;
-	int mapping, err;
+	int mapping;
 
 	mapping = armpmu->map_event(event);
 
···
 		local64_set(&hwc->period_left, hwc->sample_period);
 	}
 
-	err = 0;
 	if (event->group_leader != event) {
-		err = validate_group(event);
-		if (err)
+		if (validate_group(event) != 0);
 			return -EINVAL;
 	}
 
-	return err;
+	return 0;
 }
 
 static int armpmu_event_init(struct perf_event *event)

arch/arm/kernel/perf_event_cpu.c

···
 	cpu_pmu->free_irq	= cpu_pmu_free_irq;
 
 	/* Ensure the PMU has sane values out of reset. */
-	if (cpu_pmu && cpu_pmu->reset)
+	if (cpu_pmu->reset)
 		on_each_cpu(cpu_pmu->reset, cpu_pmu, 1);
 }
 
···
 static int probe_current_pmu(struct arm_pmu *pmu)
 {
 	int cpu = get_cpu();
-	unsigned long cpuid = read_cpuid_id();
-	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
-	unsigned long part_number = (cpuid & 0xFFF0);
+	unsigned long implementor = read_cpuid_implementor();
+	unsigned long part_number = read_cpuid_part_number();
 	int ret = -ENODEV;
 
 	pr_info("probing PMU on CPU %d\n", cpu);
 
 	/* ARM Ltd CPUs. */
-	if (0x41 == implementor) {
+	if (implementor == ARM_CPU_IMP_ARM) {
 		switch (part_number) {
-		case 0xB360:	/* ARM1136 */
-		case 0xB560:	/* ARM1156 */
-		case 0xB760:	/* ARM1176 */
+		case ARM_CPU_PART_ARM1136:
+		case ARM_CPU_PART_ARM1156:
+		case ARM_CPU_PART_ARM1176:
 			ret = armv6pmu_init(pmu);
 			break;
-		case 0xB020:	/* ARM11mpcore */
+		case ARM_CPU_PART_ARM11MPCORE:
 			ret = armv6mpcore_pmu_init(pmu);
 			break;
-		case 0xC080:	/* Cortex-A8 */
+		case ARM_CPU_PART_CORTEX_A8:
 			ret = armv7_a8_pmu_init(pmu);
 			break;
-		case 0xC090:	/* Cortex-A9 */
+		case ARM_CPU_PART_CORTEX_A9:
 			ret = armv7_a9_pmu_init(pmu);
 			break;
-		case 0xC050:	/* Cortex-A5 */
+		case ARM_CPU_PART_CORTEX_A5:
 			ret = armv7_a5_pmu_init(pmu);
 			break;
-		case 0xC0F0:	/* Cortex-A15 */
+		case ARM_CPU_PART_CORTEX_A15:
 			ret = armv7_a15_pmu_init(pmu);
 			break;
-		case 0xC070:	/* Cortex-A7 */
+		case ARM_CPU_PART_CORTEX_A7:
 			ret = armv7_a7_pmu_init(pmu);
 			break;
 		}
 	/* Intel CPUs [xscale]. */
-	} else if (0x69 == implementor) {
-		part_number = (cpuid >> 13) & 0x7;
-		switch (part_number) {
-		case 1:
+	} else if (implementor == ARM_CPU_IMP_INTEL) {
+		switch (xscale_cpu_arch_version()) {
+		case ARM_CPU_XSCALE_ARCH_V1:
 			ret = xscale1pmu_init(pmu);
 			break;
-		case 2:
+		case ARM_CPU_XSCALE_ARCH_V2:
 			ret = xscale2pmu_init(pmu);
 			break;
 		}
···
 	}
 
 	if (ret) {
-		pr_info("failed to register PMU devices!");
-		kfree(pmu);
-		return ret;
+		pr_info("failed to probe PMU!");
+		goto out_free;
 	}
 
 	cpu_pmu = pmu;
 	cpu_pmu->plat_device = pdev;
 	cpu_pmu_init(cpu_pmu);
-	armpmu_register(cpu_pmu, PERF_TYPE_RAW);
+	ret = armpmu_register(cpu_pmu, PERF_TYPE_RAW);
 
-	return 0;
+	if (!ret)
+		return 0;
+
+out_free:
+	pr_info("failed to register PMU devices!");
+	kfree(pmu);
+	return ret;
 }
 
 static struct platform_driver cpu_pmu_driver = {

arch/arm/kernel/perf_event_v6.c

···
 		},
 		[C(OP_WRITE)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
-			[C(RESULT_MISS)]	= ARMV6_PERFCTR_ICACHE_MISS,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
···
 		},
 		[C(OP_WRITE)] = {
 			[C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
-			[C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
+			[C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,

arch/arm/kernel/perf_event_v7.c

···
 			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
 		},
 		[C(OP_WRITE)] = {
-			[C(RESULT_ACCESS)]	= ARMV7_A8_PERFCTR_L1_ICACHE_ACCESS,
-			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
+			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
···
 		},
 		[C(OP_WRITE)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
-			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
···
 			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
 		},
 		[C(OP_WRITE)] = {
-			[C(RESULT_ACCESS)]	= ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
+			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		/*
 		 * The prefetch counters don't differentiate between the I
···
 			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
 		},
 		[C(OP_WRITE)] = {
-			[C(RESULT_ACCESS)]	= ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
+			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
···
 			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
 		},
 		[C(OP_WRITE)] = {
-			[C(RESULT_ACCESS)]	= ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-			[C(RESULT_MISS)]	= ARMV7_PERFCTR_L1_ICACHE_REFILL,
+			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,

arch/arm/kernel/perf_event_xscale.c

···
 		},
 		[C(OP_WRITE)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,
-			[C(RESULT_MISS)]	= XSCALE_PERFCTR_ICACHE_MISS,
+			[C(RESULT_MISS)]	= CACHE_OP_UNSUPPORTED,
 		},
 		[C(OP_PREFETCH)] = {
 			[C(RESULT_ACCESS)]	= CACHE_OP_UNSUPPORTED,