Merge branch 'perf/m1-guest-events' of git://git.kernel.org/pub/scm/linux/kernel/git/oupton/linux into for-next/perf

Pull Apple-M1 PMU driver changes from Oliver Upton, which form a prefix
of the series in the KVM/Arm tree that allows the PMU to be virtualised.
Sort of, anyway.

* 'perf/m1-guest-events' of git://git.kernel.org/pub/scm/linux/kernel/git/oupton/linux:
  drivers/perf: apple_m1: Support host/guest event filtering
  drivers/perf: apple_m1: Refactor event select/filter configuration

Author: willdeacon

arch/arm64/include/asm/apple_m1_pmu.h

@@ -37,6 +37,7 @@
 #define PMCR0_PMI_ENABLE_8_9	GENMASK(45, 44)
 
 #define SYS_IMP_APL_PMCR1_EL1	sys_reg(3, 1, 15, 1, 0)
+#define SYS_IMP_APL_PMCR1_EL12	sys_reg(3, 1, 15, 7, 2)
 #define PMCR1_COUNT_A64_EL0_0_7	GENMASK(15, 8)
 #define PMCR1_COUNT_A64_EL1_0_7	GENMASK(23, 16)
 #define PMCR1_COUNT_A64_EL0_8_9	GENMASK(41, 40)

drivers/perf/apple_m1_cpu_pmu.c

@@ -120,6 +120,8 @@ enum m1_pmu_events {
 	 */
 	M1_PMU_CFG_COUNT_USER					= BIT(8),
 	M1_PMU_CFG_COUNT_KERNEL					= BIT(9),
+	M1_PMU_CFG_COUNT_HOST					= BIT(10),
+	M1_PMU_CFG_COUNT_GUEST					= BIT(11),
 };
 
 /*
@@ -327,11 +329,10 @@ static void m1_pmu_disable_counter_interrupt(unsigned int index)
 	__m1_pmu_enable_counter_interrupt(index, false);
 }
 
-static void m1_pmu_configure_counter(unsigned int index, u8 event,
-				     bool user, bool kernel)
+static void __m1_pmu_configure_event_filter(unsigned int index, bool user,
+					    bool kernel, bool host)
 {
-	u64 val, user_bit, kernel_bit;
-	int shift;
+	u64 clear, set, user_bit, kernel_bit;
 
 	switch (index) {
 	case 0 ... 7:
@@ -346,19 +347,27 @@ static void m1_pmu_configure_counter(unsigned int index, u8 event,
 		BUG();
 	}
 
-	val = read_sysreg_s(SYS_IMP_APL_PMCR1_EL1);
-
+	clear = set = 0;
 	if (user)
-		val |= user_bit;
+		set |= user_bit;
 	else
-		val &= ~user_bit;
+		clear |= user_bit;
 
 	if (kernel)
-		val |= kernel_bit;
+		set |= kernel_bit;
 	else
-		val &= ~kernel_bit;
+		clear |= kernel_bit;
 
-	write_sysreg_s(val, SYS_IMP_APL_PMCR1_EL1);
+	if (host)
+		sysreg_clear_set_s(SYS_IMP_APL_PMCR1_EL1, clear, set);
+	else if (is_kernel_in_hyp_mode())
+		sysreg_clear_set_s(SYS_IMP_APL_PMCR1_EL12, clear, set);
+}
+
+static void __m1_pmu_configure_eventsel(unsigned int index, u8 event)
+{
+	u64 clear = 0, set = 0;
+	int shift;
 
 	/*
 	 * Counters 0 and 1 have fixed events. For anything else,
@@ -371,21 +380,32 @@ static void m1_pmu_configure_counter(unsigned int index, u8 event,
 		break;
 	case 2 ... 5:
 		shift = (index - 2) * 8;
-		val = read_sysreg_s(SYS_IMP_APL_PMESR0_EL1);
-		val &= ~((u64)0xff << shift);
-		val |= (u64)event << shift;
-		write_sysreg_s(val, SYS_IMP_APL_PMESR0_EL1);
+		clear |= (u64)0xff << shift;
+		set |= (u64)event << shift;
+		sysreg_clear_set_s(SYS_IMP_APL_PMESR0_EL1, clear, set);
 		break;
 	case 6 ... 9:
 		shift = (index - 6) * 8;
-		val = read_sysreg_s(SYS_IMP_APL_PMESR1_EL1);
-		val &= ~((u64)0xff << shift);
-		val |= (u64)event << shift;
-		write_sysreg_s(val, SYS_IMP_APL_PMESR1_EL1);
+		clear |= (u64)0xff << shift;
+		set |= (u64)event << shift;
+		sysreg_clear_set_s(SYS_IMP_APL_PMESR1_EL1, clear, set);
 		break;
 	}
 }
 
+static void m1_pmu_configure_counter(unsigned int index, unsigned long config_base)
+{
+	bool kernel = config_base & M1_PMU_CFG_COUNT_KERNEL;
+	bool guest = config_base & M1_PMU_CFG_COUNT_GUEST;
+	bool host = config_base & M1_PMU_CFG_COUNT_HOST;
+	bool user = config_base & M1_PMU_CFG_COUNT_USER;
+	u8 evt = config_base & M1_PMU_CFG_EVENT;
+
+	__m1_pmu_configure_event_filter(index, user && host, kernel && host, true);
+	__m1_pmu_configure_event_filter(index, user && guest, kernel && guest, false);
+	__m1_pmu_configure_eventsel(index, evt);
+}
+
 /* arm_pmu backend */
 static void m1_pmu_enable_event(struct perf_event *event)
 {
@@ -396,7 +416,7 @@ static void m1_pmu_enable_event(struct perf_event *event)
 	user = event->hw.config_base & M1_PMU_CFG_COUNT_USER;
 	kernel = event->hw.config_base & M1_PMU_CFG_COUNT_KERNEL;
 
-	m1_pmu_configure_counter(event->hw.idx, evt, user, kernel);
+	m1_pmu_configure_counter(event->hw.idx, event->hw.config_base);
 	m1_pmu_enable_counter(event->hw.idx);
 	m1_pmu_enable_counter_interrupt(event->hw.idx);
 	isb();
@@ -554,14 +574,18 @@ static int m1_pmu_set_event_filter(struct hw_perf_event *event,
 {
 	unsigned long config_base = 0;
 
-	if (!attr->exclude_guest) {
+	if (!attr->exclude_guest && !is_kernel_in_hyp_mode()) {
 		pr_debug("ARM performance counters do not support mode exclusion\n");
 		return -EOPNOTSUPP;
 	}
 	if (!attr->exclude_kernel)
 		config_base |= M1_PMU_CFG_COUNT_KERNEL;
 	if (!attr->exclude_user)
 		config_base |= M1_PMU_CFG_COUNT_USER;
+	if (!attr->exclude_host)
+		config_base |= M1_PMU_CFG_COUNT_HOST;
+	if (!attr->exclude_guest)
+		config_base |= M1_PMU_CFG_COUNT_GUEST;
 
 	event->config_base = config_base;