linux-kernel - Re: [PATCH v2 1/6] drm/panfrost: Add cycle count GPU register definitions

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Message-ID: <1588defa-d196-5c3e-5d5b-4d6aaa0a60d5@arm.com>
Date:   Thu, 31 Aug 2023 16:54:02 +0100
From:   Steven Price <steven.price@....com>
To:     Adrián Larumbe <adrian.larumbe@...labora.com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        robdclark@...il.com, quic_abhinavk@...cinc.com,
        dmitry.baryshkov@...aro.org, sean@...rly.run,
        marijn.suijten@...ainline.org, robh@...nel.org
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        healych@...zon.com, kernel@...labora.com
Subject: Re: [PATCH v2 1/6] drm/panfrost: Add cycle count GPU register
 definitions

On 24/08/2023 02:34, Adrián Larumbe wrote:
> These GPU registers will be used when programming the cycle counter, which
> we need for providing accurate fdinfo drm-cycles values to user space.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_regs.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_regs.h b/drivers/gpu/drm/panfrost/panfrost_regs.h
> index 919f44ac853d..55ec807550b3 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_regs.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_regs.h
> @@ -46,6 +46,8 @@
>  #define   GPU_CMD_SOFT_RESET		0x01
>  #define   GPU_CMD_PERFCNT_CLEAR		0x03
>  #define   GPU_CMD_PERFCNT_SAMPLE	0x04
> +#define   GPU_CMD_CYCLE_COUNT_START	0x05
> +#define   GPU_CMD_CYCLE_COUNT_STOP	0x06
>  #define   GPU_CMD_CLEAN_CACHES		0x07
>  #define   GPU_CMD_CLEAN_INV_CACHES	0x08
>  #define GPU_STATUS			0x34
> @@ -73,6 +75,9 @@
>  #define GPU_PRFCNT_TILER_EN		0x74
>  #define GPU_PRFCNT_MMU_L2_EN		0x7c
>  
> +#define GPU_CYCLE_COUNT_LO		0x90
> +#define GPU_CYCLE_COUNT_HI		0x94
> +
>  #define GPU_THREAD_MAX_THREADS		0x0A0	/* (RO) Maximum number of threads per core */
>  #define GPU_THREAD_MAX_WORKGROUP_SIZE	0x0A4	/* (RO) Maximum workgroup size */
>  #define GPU_THREAD_MAX_BARRIER_SIZE	0x0A8	/* (RO) Maximum threads waiting at a barrier */