linux-kernel - [PATCH v6 05/24] RISC-V: Add SBI PMU snapshot definitions

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Date: Wed, 10 Apr 2024 17:07:33 -0700
From: Atish Patra <atishp@...osinc.com>
To: linux-kernel@...r.kernel.org
Cc: Atish Patra <atishp@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Anup Patel <anup@...infault.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Alexey Makhalov <alexey.amakhalov@...adcom.com>,
	Atish Patra <atishp@...shpatra.org>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Juergen Gross <jgross@...e.com>,
	kvm-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Shuah Khan <shuah@...nel.org>,
	virtualization@...ts.linux.dev,
	Will Deacon <will@...nel.org>,
	x86@...nel.org
Subject: [PATCH v6 05/24] RISC-V: Add SBI PMU snapshot definitions

SBI PMU Snapshot function optimizes the number of traps to
higher privilege mode by leveraging a shared memory between the S/VS-mode
and the M/HS mode. Add the definitions for that extension and new error
codes.

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Reviewed-by: Anup Patel <anup@...infault.org>
Acked-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/include/asm/sbi.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 4afa2cd01bae..9aada4b9f7b5 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -132,6 +132,7 @@ enum sbi_ext_pmu_fid {
 	SBI_EXT_PMU_COUNTER_STOP,
 	SBI_EXT_PMU_COUNTER_FW_READ,
 	SBI_EXT_PMU_COUNTER_FW_READ_HI,
+	SBI_EXT_PMU_SNAPSHOT_SET_SHMEM,
 };
 
 union sbi_pmu_ctr_info {
@@ -148,6 +149,13 @@ union sbi_pmu_ctr_info {
 	};
 };
 
+/* Data structure to contain the pmu snapshot data */
+struct riscv_pmu_snapshot_data {
+	u64 ctr_overflow_mask;
+	u64 ctr_values[64];
+	u64 reserved[447];
+};
+
 #define RISCV_PMU_RAW_EVENT_MASK GENMASK_ULL(47, 0)
 #define RISCV_PMU_RAW_EVENT_IDX 0x20000
 
@@ -244,9 +252,11 @@ enum sbi_pmu_ctr_type {
 
 /* Flags defined for counter start function */
 #define SBI_PMU_START_FLAG_SET_INIT_VALUE BIT(0)
+#define SBI_PMU_START_FLAG_INIT_SNAPSHOT BIT(1)
 
 /* Flags defined for counter stop function */
 #define SBI_PMU_STOP_FLAG_RESET BIT(0)
+#define SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT BIT(1)
 
 enum sbi_ext_dbcn_fid {
 	SBI_EXT_DBCN_CONSOLE_WRITE = 0,
@@ -285,6 +295,7 @@ struct sbi_sta_struct {
 #define SBI_ERR_ALREADY_AVAILABLE -6
 #define SBI_ERR_ALREADY_STARTED -7
 #define SBI_ERR_ALREADY_STOPPED -8
+#define SBI_ERR_NO_SHMEM	-9
 
 extern unsigned long sbi_spec_version;
 struct sbiret {
-- 
2.34.1