diff mbox series

[v4,02/14] perf: RISC-V: Improve privilege mode filtering for perf

Message ID 20230201231250.3806412-3-atishp@rivosinc.com (mailing list archive)
State Superseded
Headers show
Series KVM perf support | expand

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conchuod/build_rv32_defconfig success Build OK
conchuod/dtb_warn_rv64 success Errors and warnings before: 2 this patch: 2
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conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
conchuod/build_rv64_nommu_virt_defconfig success Build OK

Commit Message

Atish Kumar Patra Feb. 1, 2023, 11:12 p.m. UTC 
Currently, the host driver doesn't have any method to identify if the
requested perf event is from kvm or bare metal. As KVM runs in HS
mode, there are no separate hypervisor privilege mode to distinguish
between the attributes for guest/host.

Improve the privilege mode filtering by using the event specific
config1 field.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
---
 drivers/perf/riscv_pmu_sbi.c   | 27 ++++++++++++++++++++++-----
 include/linux/perf/riscv_pmu.h |  2 ++
 2 files changed, 24 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index 6b53adc..71174fa 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -301,6 +301,27 @@  int riscv_pmu_get_hpm_info(u32 *hw_ctr_width, u32 *num_hw_ctr)
 }
 EXPORT_SYMBOL_GPL(riscv_pmu_get_hpm_info);
 
+static unsigned long pmu_sbi_get_filter_flags(struct perf_event *event)
+{
+	unsigned long cflags = 0;
+	bool guest_events = false;
+
+	if (event->attr.config1 & RISCV_PMU_CONFIG1_GUEST_EVENTS)
+		guest_events = true;
+	if (event->attr.exclude_kernel)
+		cflags |= guest_events ? SBI_PMU_CFG_FLAG_SET_VSINH : SBI_PMU_CFG_FLAG_SET_SINH;
+	if (event->attr.exclude_user)
+		cflags |= guest_events ? SBI_PMU_CFG_FLAG_SET_VUINH : SBI_PMU_CFG_FLAG_SET_UINH;
+	if (guest_events && event->attr.exclude_hv)
+		cflags |= SBI_PMU_CFG_FLAG_SET_SINH;
+	if (event->attr.exclude_host)
+		cflags |= SBI_PMU_CFG_FLAG_SET_UINH | SBI_PMU_CFG_FLAG_SET_SINH;
+	if (event->attr.exclude_guest)
+		cflags |= SBI_PMU_CFG_FLAG_SET_VSINH | SBI_PMU_CFG_FLAG_SET_VUINH;
+
+	return cflags;
+}
+
 static int pmu_sbi_ctr_get_idx(struct perf_event *event)
 {
 	struct hw_perf_event *hwc = &event->hw;
@@ -311,11 +332,7 @@  static int pmu_sbi_ctr_get_idx(struct perf_event *event)
 	uint64_t cbase = 0;
 	unsigned long cflags = 0;
 
-	if (event->attr.exclude_kernel)
-		cflags |= SBI_PMU_CFG_FLAG_SET_SINH;
-	if (event->attr.exclude_user)
-		cflags |= SBI_PMU_CFG_FLAG_SET_UINH;
-
+	cflags = pmu_sbi_get_filter_flags(event);
 	/* retrieve the available counter index */
 #if defined(CONFIG_32BIT)
 	ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_CFG_MATCH, cbase,
diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h
index a1c3f77..43fc892 100644
--- a/include/linux/perf/riscv_pmu.h
+++ b/include/linux/perf/riscv_pmu.h
@@ -26,6 +26,8 @@ 
 
 #define RISCV_PMU_STOP_FLAG_RESET 1
 
+#define RISCV_PMU_CONFIG1_GUEST_EVENTS 0x1
+
 struct cpu_hw_events {
 	/* currently enabled events */
 	int			n_events;