linux-kernel - [PATCH v2 18/21] RISC-V: perf: Add Qemu virt machine events

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Message-Id: <20250114-counter_delegation-v2-18-8ba74cdb851b@rivosinc.com>
Date: Tue, 14 Jan 2025 14:57:43 -0800
From: Atish Patra <atishp@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Anup Patel <anup@...infault.org>, 
 Atish Patra <atishp@...shpatra.org>, Will Deacon <will@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, Peter Zijlstra <peterz@...radead.org>, 
 Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, weilin.wang@...el.com
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Palmer Dabbelt <palmer@...ive.com>, Conor Dooley <conor@...nel.org>, 
 devicetree@...r.kernel.org, kvm@...r.kernel.org, 
 kvm-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-perf-users@...r.kernel.org, Atish Patra <atishp@...osinc.com>
Subject: [PATCH v2 18/21] RISC-V: perf: Add Qemu virt machine events

Qemu virt machine supports a very minimal set of legacy perf events.
Add them to the vendor table so that users can use them when
counter delegation is enabled.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/include/asm/vendorid_list.h |  4 ++++
 drivers/perf/riscv_pmu_dev.c           | 36 ++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/arch/riscv/include/asm/vendorid_list.h b/arch/riscv/include/asm/vendorid_list.h
index 2f2bb0c84f9a..ef22b03552bc 100644
--- a/arch/riscv/include/asm/vendorid_list.h
+++ b/arch/riscv/include/asm/vendorid_list.h
@@ -9,4 +9,8 @@
 #define SIFIVE_VENDOR_ID	0x489
 #define THEAD_VENDOR_ID		0x5b7
 
+#define QEMU_VIRT_VENDOR_ID		0x000
+#define QEMU_VIRT_IMPL_ID		0x000
+#define QEMU_VIRT_ARCH_ID		0x000
+
 #endif
diff --git a/drivers/perf/riscv_pmu_dev.c b/drivers/perf/riscv_pmu_dev.c
index 8c5598253af0..d28d60abaaf2 100644
--- a/drivers/perf/riscv_pmu_dev.c
+++ b/drivers/perf/riscv_pmu_dev.c
@@ -26,6 +26,7 @@
 #include <asm/sbi.h>
 #include <asm/cpufeature.h>
 #include <asm/vendor_extensions.h>
+#include <asm/vendorid_list.h>
 #include <asm/vendor_extensions/andes.h>
 #include <asm/hwcap.h>
 #include <asm/csr_ind.h>
@@ -384,7 +385,42 @@ struct riscv_vendor_pmu_events {
 	  .hw_event_map = _hw_event_map, .cache_event_map = _cache_event_map, \
 	  .attrs_events = _attrs },
 
+/* QEMU virt PMU events */
+static const struct riscv_pmu_event qemu_virt_hw_event_map[PERF_COUNT_HW_MAX] = {
+	PERF_MAP_ALL_UNSUPPORTED,
+	[PERF_COUNT_HW_CPU_CYCLES]		= {0x01, 0xFFFFFFF8},
+	[PERF_COUNT_HW_INSTRUCTIONS]		= {0x02, 0xFFFFFFF8}
+};
+
+static const struct riscv_pmu_event qemu_virt_cache_event_map[PERF_COUNT_HW_CACHE_MAX]
+						[PERF_COUNT_HW_CACHE_OP_MAX]
+						[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+	PERF_CACHE_MAP_ALL_UNSUPPORTED,
+	[C(DTLB)][C(OP_READ)][C(RESULT_MISS)]	= {0x10019, 0xFFFFFFF8},
+	[C(DTLB)][C(OP_WRITE)][C(RESULT_MISS)]	= {0x1001B, 0xFFFFFFF8},
+
+	[C(ITLB)][C(OP_READ)][C(RESULT_MISS)]	= {0x10021, 0xFFFFFFF8},
+};
+
+RVPMU_EVENT_CMASK_ATTR(cycles, cycles, 0x01, 0xFFFFFFF8);
+RVPMU_EVENT_CMASK_ATTR(instructions, instructions, 0x02, 0xFFFFFFF8);
+RVPMU_EVENT_CMASK_ATTR(dTLB-load-misses, dTLB_load_miss, 0x10019, 0xFFFFFFF8);
+RVPMU_EVENT_CMASK_ATTR(dTLB-store-misses, dTLB_store_miss, 0x1001B, 0xFFFFFFF8);
+RVPMU_EVENT_CMASK_ATTR(iTLB-load-misses, iTLB_load_miss, 0x10021, 0xFFFFFFF8);
+
+static struct attribute *qemu_virt_event_group[] = {
+	RVPMU_EVENT_ATTR_PTR(cycles),
+	RVPMU_EVENT_ATTR_PTR(instructions),
+	RVPMU_EVENT_ATTR_PTR(dTLB_load_miss),
+	RVPMU_EVENT_ATTR_PTR(dTLB_store_miss),
+	RVPMU_EVENT_ATTR_PTR(iTLB_load_miss),
+	NULL,
+};
+
 static struct riscv_vendor_pmu_events pmu_vendor_events_table[] = {
+	RISCV_VENDOR_PMU_EVENTS(QEMU_VIRT_VENDOR_ID, QEMU_VIRT_ARCH_ID, QEMU_VIRT_IMPL_ID,
+				qemu_virt_hw_event_map, qemu_virt_cache_event_map,
+				qemu_virt_event_group)
 };
 
 const struct riscv_pmu_event *current_pmu_hw_event_map;

-- 
2.34.1