linux-kernel - Re: [PATCH v8 20/24] KVM: riscv: selftests: Add SBI PMU extension definitions

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Message-ID: <ab2d90ee-6fc9-4149-bf00-dd0cf53d5496@collabora.com>
Date: Tue, 23 Apr 2024 13:58:32 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Atish Patra <atishp@...osinc.com>, linux-kernel@...r.kernel.org
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Andrew Jones <ajones@...tanamicro.com>, Anup Patel <anup@...infault.org>,
 Ajay Kaher <ajay.kaher@...adcom.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alexghiti@...osinc.com>, samuel.holland@...ive.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: Re: [PATCH v8 20/24] KVM: riscv: selftests: Add SBI PMU extension
 definitions

On 4/20/24 8:17 PM, Atish Patra wrote:
> The SBI PMU extension definition is required for upcoming SBI PMU
> selftests.
> 
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> Reviewed-by: Anup Patel <anup@...infault.org>
> Signed-off-by: Atish Patra <atishp@...osinc.com>
LGTM

Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  .../testing/selftests/kvm/include/riscv/sbi.h | 66 +++++++++++++++++++
>  1 file changed, 66 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/include/riscv/sbi.h b/tools/testing/selftests/kvm/include/riscv/sbi.h
> index ba04f2dec7b5..6675ca673c77 100644
> --- a/tools/testing/selftests/kvm/include/riscv/sbi.h
> +++ b/tools/testing/selftests/kvm/include/riscv/sbi.h
> @@ -29,17 +29,83 @@
>  enum sbi_ext_id {
>  	SBI_EXT_BASE = 0x10,
>  	SBI_EXT_STA = 0x535441,
> +	SBI_EXT_PMU = 0x504D55,
>  };
>  
>  enum sbi_ext_base_fid {
>  	SBI_EXT_BASE_PROBE_EXT = 3,
>  };
> +enum sbi_ext_pmu_fid {
> +	SBI_EXT_PMU_NUM_COUNTERS = 0,
> +	SBI_EXT_PMU_COUNTER_GET_INFO,
> +	SBI_EXT_PMU_COUNTER_CFG_MATCH,
> +	SBI_EXT_PMU_COUNTER_START,
> +	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 {
> +	unsigned long value;
> +	struct {
> +		unsigned long csr:12;
> +		unsigned long width:6;
> +#if __riscv_xlen == 32
> +		unsigned long reserved:13;
> +#else
> +		unsigned long reserved:45;
> +#endif
> +		unsigned long type:1;
> +	};
> +};
>  
>  struct sbiret {
>  	long error;
>  	long value;
>  };
>  
> +/** General pmu event codes specified in SBI PMU extension */
> +enum sbi_pmu_hw_generic_events_t {
> +	SBI_PMU_HW_NO_EVENT			= 0,
> +	SBI_PMU_HW_CPU_CYCLES			= 1,
> +	SBI_PMU_HW_INSTRUCTIONS			= 2,
> +	SBI_PMU_HW_CACHE_REFERENCES		= 3,
> +	SBI_PMU_HW_CACHE_MISSES			= 4,
> +	SBI_PMU_HW_BRANCH_INSTRUCTIONS		= 5,
> +	SBI_PMU_HW_BRANCH_MISSES		= 6,
> +	SBI_PMU_HW_BUS_CYCLES			= 7,
> +	SBI_PMU_HW_STALLED_CYCLES_FRONTEND	= 8,
> +	SBI_PMU_HW_STALLED_CYCLES_BACKEND	= 9,
> +	SBI_PMU_HW_REF_CPU_CYCLES		= 10,
> +
> +	SBI_PMU_HW_GENERAL_MAX,
> +};
> +
> +/* SBI PMU counter types */
> +enum sbi_pmu_ctr_type {
> +	SBI_PMU_CTR_TYPE_HW = 0x0,
> +	SBI_PMU_CTR_TYPE_FW,
> +};
> +
> +/* Flags defined for config matching function */
> +#define SBI_PMU_CFG_FLAG_SKIP_MATCH	BIT(0)
> +#define SBI_PMU_CFG_FLAG_CLEAR_VALUE	BIT(1)
> +#define SBI_PMU_CFG_FLAG_AUTO_START	BIT(2)
> +#define SBI_PMU_CFG_FLAG_SET_VUINH	BIT(3)
> +#define SBI_PMU_CFG_FLAG_SET_VSINH	BIT(4)
> +#define SBI_PMU_CFG_FLAG_SET_UINH	BIT(5)
> +#define SBI_PMU_CFG_FLAG_SET_SINH	BIT(6)
> +#define SBI_PMU_CFG_FLAG_SET_MINH	BIT(7)
> +
> +/* 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)
> +
>  struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
>  			unsigned long arg1, unsigned long arg2,
>  			unsigned long arg3, unsigned long arg4,

-- 
BR,
Muhammad Usama Anjum