linux-kernel - [PATCH 1/8] drivers/perf: riscv: Add SBI v3.0 flag

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Message-Id: <20241119-pmu_event_info-v1-1-a4f9691421f8@rivosinc.com>
Date: Tue, 19 Nov 2024 12:29:49 -0800
From: Atish Patra <atishp@...osinc.com>
To: Anup Patel <anup@...infault.org>, Will Deacon <will@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, 
 Mayuresh Chitale <mchitale@...tanamicro.com>
Cc: linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>, 
 kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, 
 Atish Patra <atishp@...osinc.com>
Subject: [PATCH 1/8] drivers/perf: riscv: Add SBI v3.0 flag

There are new PMU related features introduced in SBI v3.0.
1. Raw Event v2 which allows mhpmeventX value to be 56 bit wide.
2. Get Event info function to do a bulk query at one shot.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 drivers/perf/riscv_pmu_sbi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index 391ca1422cae..cb98efa9b106 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -63,6 +63,7 @@ PMU_FORMAT_ATTR(event, "config:0-47");
 PMU_FORMAT_ATTR(firmware, "config:62-63");
 
 static bool sbi_v2_available;
+static bool sbi_v3_available;
 static DEFINE_STATIC_KEY_FALSE(sbi_pmu_snapshot_available);
 #define sbi_pmu_snapshot_available() \
 	static_branch_unlikely(&sbi_pmu_snapshot_available)
@@ -1450,6 +1451,9 @@ static int __init pmu_sbi_devinit(void)
 	if (sbi_spec_version >= sbi_mk_version(2, 0))
 		sbi_v2_available = true;
 
+	if (sbi_spec_version >= sbi_mk_version(3, 0))
+		sbi_v3_available = true;
+
 	ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING,
 				      "perf/riscv/pmu:starting",
 				      pmu_sbi_starting_cpu, pmu_sbi_dying_cpu);

-- 
2.34.1