[v8,05/24] RISC-V: Add SBI PMU snapshot definitions

Message ID	20240420151741.962500-6-atishp@rivosinc.com (mailing list archive)
State	New, archived
Headers	show Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 93776142909 for <kvm@vger.kernel.org>; Fri, 19 Apr 2024 23:47:54 +0000 (UTC) From: Atish Patra <atishp@rivosinc.com> To: linux-kernel@vger.kernel.org Cc: Atish Patra <atishp@rivosinc.com>, Andrew Jones <ajones@ventanamicro.com>, Anup Patel <anup@brainfault.org>, Palmer Dabbelt <palmer@rivosinc.com>, Ajay Kaher <ajay.kaher@broadcom.com>, Albert Ou <aou@eecs.berkeley.edu>, Alexandre Ghiti <alexghiti@rivosinc.com>, samuel.holland@sifive.com, Conor Dooley <conor.dooley@microchip.com>, Juergen Gross <jgross@suse.com>, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Rutland <mark.rutland@arm.com>, Palmer Dabbelt <palmer@dabbelt.com>, Paolo Bonzini <pbonzini@redhat.com>, Paul Walmsley <paul.walmsley@sifive.com>, Shuah Khan <shuah@kernel.org>, virtualization@lists.linux.dev, Will Deacon <will@kernel.org>, x86@kernel.org Subject: [PATCH v8 05/24] RISC-V: Add SBI PMU snapshot definitions Date: Sat, 20 Apr 2024 08:17:21 -0700 Message-Id: <20240420151741.962500-6-atishp@rivosinc.com> In-Reply-To: <20240420151741.962500-1-atishp@rivosinc.com> References: <20240420151741.962500-1-atishp@rivosinc.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest \| expand [v8,00/24] RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest [v8,01/24] RISC-V: Fix the typo in Scountovf CSR name [v8,02/24] RISC-V: Add FIRMWARE_READ_HI definition [v8,03/24] drivers/perf: riscv: Read upper bits of a firmware counter [v8,04/24] drivers/perf: riscv: Use BIT macro for shifting operations [v8,05/24] RISC-V: Add SBI PMU snapshot definitions [v8,06/24] RISC-V: KVM: Rename the SBI_STA_SHMEM_DISABLE to a generic name [v8,07/24] RISC-V: Use the minor version mask while computing sbi version [v8,08/24] drivers/perf: riscv: Fix counter mask iteration for RV32 [v8,09/24] drivers/perf: riscv: Implement SBI PMU snapshot function [v8,10/24] RISC-V: KVM: Fix the initial sample period value [v8,11/24] RISC-V: KVM: No need to update the counter value during reset [v8,12/24] RISC-V: KVM: No need to exit to the user space if perf event failed [v8,13/24] RISC-V: KVM: Implement SBI PMU Snapshot feature [v8,14/24] RISC-V: KVM: Add perf sampling support for guests [v8,15/24] RISC-V: KVM: Support 64 bit firmware counters on RV32 [v8,16/24] RISC-V: KVM: Improve firmware counter read function [v8,17/24] KVM: riscv: selftests: Move sbi definitions to its own header file [v8,18/24] KVM: riscv: selftests: Add helper functions for extension checks [v8,19/24] KVM: riscv: selftests: Add Sscofpmf to get-reg-list test [v8,20/24] KVM: riscv: selftests: Add SBI PMU extension definitions [v8,21/24] KVM: riscv: selftests: Add SBI PMU selftest [v8,22/24] KVM: riscv: selftests: Add a test for PMU snapshot functionality [v8,23/24] KVM: riscv: selftests: Add a test for counter overflow [v8,24/24] KVM: riscv: selftests: Add commandline option for SBI PMU test

Message ID

20240420151741.962500-6-atishp@rivosinc.com (mailing list archive)

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New, archived

Headers

From: Atish Patra <atishp@rivosinc.com>
To: linux-kernel@vger.kernel.org
Cc: Atish Patra <atishp@rivosinc.com>,
	Andrew Jones <ajones@ventanamicro.com>,
	Anup Patel <anup@brainfault.org>,
	Palmer Dabbelt <palmer@rivosinc.com>,
	Ajay Kaher <ajay.kaher@broadcom.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alexghiti@rivosinc.com>,
	samuel.holland@sifive.com,
	Conor Dooley <conor.dooley@microchip.com>,
	Juergen Gross <jgross@suse.com>,
	kvm-riscv@lists.infradead.org,
	kvm@vger.kernel.org,
	linux-kselftest@vger.kernel.org,
	linux-riscv@lists.infradead.org,
	Mark Rutland <mark.rutland@arm.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Shuah Khan <shuah@kernel.org>,
	virtualization@lists.linux.dev,
	Will Deacon <will@kernel.org>,
	x86@kernel.org
Subject: [PATCH v8 05/24] RISC-V: Add SBI PMU snapshot definitions
Date: Sat, 20 Apr 2024 08:17:21 -0700
Message-Id: <20240420151741.962500-6-atishp@rivosinc.com>
In-Reply-To: <20240420151741.962500-1-atishp@rivosinc.com>
References: <20240420151741.962500-1-atishp@rivosinc.com>
Precedence: bulk
MIME-Version: 1.0
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Series

RISC-V SBI v2.0 PMU improvements and Perf sampling in KVM guest | expand

Commit Message

Atish Kumar Patra April 20, 2024, 3:17 p.m. UTC

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@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.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 {

[v8,05/24] RISC-V: Add SBI PMU snapshot definitions

Commit Message

Patch