linux-kernel - Re: [v4 05/11] RISC-V: Add RISC-V SBI PMU extension definitions

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Message-ID: <20211215110214.62ca2474@redslave.neermore.group>
Date:   Wed, 15 Dec 2021 11:02:14 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Atish Patra <atish.patra@....com>
Cc:     linux-kernel@...r.kernel.org, Anup Patel <anup.patel@....com>,
        David Abdurachmanov <david.abdurachmanov@...ive.com>,
        devicetree@...r.kernel.org, Greentime Hu <greentime.hu@...ive.com>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Nick Kossifidis <mick@....forth.gr>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Vincent Chen <vincent.chen@...ive.com>
Subject: Re: [v4 05/11] RISC-V: Add RISC-V SBI PMU extension definitions

Hello Atish!

On Mon, 25 Oct 2021 12:53:44 -0700
Atish Patra <atish.patra@....com> wrote:

> This patch adds all the definitions defined by the SBI PMU extension.
> 
> Signed-off-by: Atish Patra <atish.patra@....com>
> ---
>  arch/riscv/include/asm/sbi.h | 97
> ++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/sbi.h
> b/arch/riscv/include/asm/sbi.h index 0d42693cb65e..7a14ca06ba8f 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -27,6 +27,7 @@ enum sbi_ext_id {
>  	SBI_EXT_IPI = 0x735049,
>  	SBI_EXT_RFENCE = 0x52464E43,
>  	SBI_EXT_HSM = 0x48534D,
> +	SBI_EXT_PMU = 0x504D55,
>  };
>  
>  enum sbi_ext_base_fid {
> @@ -70,6 +71,99 @@ enum sbi_hsm_hart_status {
>  	SBI_HSM_HART_STATUS_STOP_PENDING,
>  };
>  
> +
> +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,
> +};
> +
> +#define RISCV_PMU_RAW_EVENT_MASK GENMASK_ULL(55, 0)
> +#define RISCV_PMU_RAW_EVENT_IDX 0x20000
> +
> +/** 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,
> +};
> +
> +/**
> + * Special "firmware" events provided by the firmware, even if the
> hardware
> + * does not support performance events. These events are encoded as
> a raw
> + * event type in Linux kernel perf framework.
> + */
> +enum sbi_pmu_fw_generic_events_t {
> +	SBI_PMU_FW_MISALIGNED_LOAD	= 0,
> +	SBI_PMU_FW_MISALIGNED_STORE	= 1,
> +	SBI_PMU_FW_ACCESS_LOAD		= 2,
> +	SBI_PMU_FW_ACCESS_STORE		= 3,
> +	SBI_PMU_FW_ILLEGAL_INSN		= 4,
> +	SBI_PMU_FW_SET_TIMER		= 5,
> +	SBI_PMU_FW_IPI_SENT		= 6,
> +	SBI_PMU_FW_IPI_RECVD		= 7,
> +	SBI_PMU_FW_FENCE_I_SENT		= 8,
> +	SBI_PMU_FW_FENCE_I_RECVD	= 9,
> +	SBI_PMU_FW_SFENCE_VMA_SENT	= 10,
> +	SBI_PMU_FW_SFENCE_VMA_RCVD	= 11,
> +	SBI_PMU_FW_SFENCE_VMA_ASID_SENT	= 12,
> +	SBI_PMU_FW_SFENCE_VMA_ASID_RCVD	= 13,
> +
> +	SBI_PMU_FW_HFENCE_GVMA_SENT	= 14,
> +	SBI_PMU_FW_HFENCE_GVMA_RCVD	= 15,
> +	SBI_PMU_FW_HFENCE_GVMA_VMID_SENT = 16,
> +	SBI_PMU_FW_HFENCE_GVMA_VMID_RCVD = 17,
> +
> +	SBI_PMU_FW_HFENCE_VVMA_SENT	= 18,
> +	SBI_PMU_FW_HFENCE_VVMA_RCVD	= 19,
> +	SBI_PMU_FW_HFENCE_VVMA_ASID_SENT = 20,
> +	SBI_PMU_FW_HFENCE_VVMA_ASID_RCVD = 21,
> +	SBI_PMU_FW_MAX,
> +};
> +
> +/* SBI PMU event types */
> +enum sbi_pmu_event_type {
> +	SBI_PMU_EVENT_TYPE_HW = 0x0,
> +	SBI_PMU_EVENT_TYPE_CACHE = 0x1,
> +	SBI_PMU_EVENT_TYPE_RAW = 0x2,
> +	SBI_PMU_EVENT_TYPE_FW = 0xf,
> +};
> +
> +/* SBI PMU event 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	(1 << 0)
> +#define SBI_PMU_CFG_FLAG_CLEAR_VALUE	(1 << 1)
> +#define SBI_PMU_CFG_FLAG_AUTO_START	(1 << 2)
> +#define SBI_PMU_CFG_FLAG_SET_MINH	(1 << 3)
> +#define SBI_PMU_CFG_FLAG_SET_SINH	(1 << 4)
> +#define SBI_PMU_CFG_FLAG_SET_UINH	(1 << 5)
> +#define SBI_PMU_CFG_FLAG_SET_VSINH	(1 << 6)
> +#define SBI_PMU_CFG_FLAG_SET_VUINH	(1 << 7)

It looks like you have a typo here, the defines in OpenSBI are
different:

#define SBI_PMU_CFG_FLAG_SET_VUINH	(1 << 3)
#define SBI_PMU_CFG_FLAG_SET_VSINH	(1 << 4)
#define SBI_PMU_CFG_FLAG_SET_UINH	(1 << 5)
#define SBI_PMU_CFG_FLAG_SET_SINH	(1 << 6)
#define SBI_PMU_CFG_FLAG_SET_MINH	(1 << 7)


> +
> +/* Flags defined for counter start function */
> +#define SBI_PMU_START_FLAG_SET_INIT_VALUE (1 << 0)
> +
> +/* Flags defined for counter stop function */
> +#define SBI_PMU_STOP_FLAG_RESET (1 << 0)
> +
>  #define SBI_SPEC_VERSION_DEFAULT	0x1
>  #define SBI_SPEC_VERSION_MAJOR_SHIFT	24
>  #define SBI_SPEC_VERSION_MAJOR_MASK	0x7f
> @@ -82,6 +176,9 @@ enum sbi_hsm_hart_status {
>  #define SBI_ERR_INVALID_PARAM	-3
>  #define SBI_ERR_DENIED		-4
>  #define SBI_ERR_INVALID_ADDRESS	-5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
>  
>  extern unsigned long sbi_spec_version;
>  struct sbiret {