linux-kernel - Re: [PATCH v5 10/11] drm/msm/A6xx: Enable preemption for A750

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Message-ID: <CAF6AEGsixas1wa4k6QjjwdjKqq1hHk8RDBeL-MUHTcmMRrFDoQ@mail.gmail.com>
Date: Tue, 24 Sep 2024 09:27:16 -0700
From: Rob Clark <robdclark@...il.com>
To: Antonino Maniscalco <antomani103@...il.com>
Cc: Sean Paul <sean@...rly.run>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Jonathan Corbet <corbet@....net>, linux-arm-msm@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
	Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v5 10/11] drm/msm/A6xx: Enable preemption for A750

nit, lowercase "a6xx" in subject prefix

(no need to resend just for this, I can fix it up when applying
patches if needed.. but if you do resend pls fix that)

BR
-R

On Tue, Sep 24, 2024 at 4:30 AM Antonino Maniscalco
<antomani103@...il.com> wrote:
>
> Initialize with 4 rings to enable preemption.
>
> For now only on A750 as other targets require testing.
>
> Add the "preemption_enabled" module parameter to override this for other
> A7xx targets.
>
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-QRD
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8550-QRD
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8450-HDK
> Signed-off-by: Antonino Maniscalco <antomani103@...il.com>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_catalog.c  | 3 ++-
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c      | 6 +++++-
>  drivers/gpu/drm/msm/adreno/adreno_device.c | 4 ++++
>  drivers/gpu/drm/msm/adreno/adreno_gpu.h    | 1 +
>  4 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> index 316f23ca91671d973797f2a5b69344f376707325..0e3041b2941905f1acdc9e571e0549a960a7edfa 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> @@ -1240,7 +1240,8 @@ static const struct adreno_info a7xx_gpus[] = {
>                 .gmem = 3 * SZ_1M,
>                 .inactive_period = DRM_MSM_INACTIVE_PERIOD,
>                 .quirks = ADRENO_QUIRK_HAS_CACHED_COHERENT |
> -                         ADRENO_QUIRK_HAS_HW_APRIV,
> +                         ADRENO_QUIRK_HAS_HW_APRIV |
> +                         ADRENO_QUIRK_PREEMPTION,
>                 .init = a6xx_gpu_init,
>                 .zapfw = "gen70900_zap.mbn",
>                 .a6xx = &(const struct a6xx_info) {
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index edbcb6d229ba614be910ee70e75731538116e4a4..4760f9469613c0bf208f56be9608747b5aa75606 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2529,6 +2529,7 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>         struct a6xx_gpu *a6xx_gpu;
>         struct adreno_gpu *adreno_gpu;
>         struct msm_gpu *gpu;
> +       extern int enable_preemption;
>         bool is_a7xx;
>         int ret;
>
> @@ -2567,7 +2568,10 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>                 return ERR_PTR(ret);
>         }
>
> -       if (is_a7xx)
> +       if ((enable_preemption == 1) || (enable_preemption == -1 &&
> +           (config->info->quirks & ADRENO_QUIRK_PREEMPTION)))
> +               ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_a7xx, 4);
> +       else if (is_a7xx)
>                 ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_a7xx, 1);
>         else if (adreno_has_gmu_wrapper(adreno_gpu))
>                 ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_gmuwrapper, 1);
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
> index cfc74a9e2646d3de76a06bd67457d69afa49e309..9ffe91920fbfb4841b28aabec9fbde94539fdd83 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
> @@ -20,6 +20,10 @@ bool allow_vram_carveout = false;
>  MODULE_PARM_DESC(allow_vram_carveout, "Allow using VRAM Carveout, in place of IOMMU");
>  module_param_named(allow_vram_carveout, allow_vram_carveout, bool, 0600);
>
> +int enable_preemption = -1;
> +MODULE_PARM_DESC(enable_preemption, "Enable preemption (A7xx only) (1=on , 0=disable, -1=auto (default))");
> +module_param(enable_preemption, int, 0600);
> +
>  extern const struct adreno_gpulist a2xx_gpulist;
>  extern const struct adreno_gpulist a3xx_gpulist;
>  extern const struct adreno_gpulist a4xx_gpulist;
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> index 87098567483b69c21025b80f356e0a68f0e7f172..d1cd53f05de68b3873f35520655e09e82fc40449 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> @@ -56,6 +56,7 @@ enum adreno_family {
>  #define ADRENO_QUIRK_LMLOADKILL_DISABLE                BIT(2)
>  #define ADRENO_QUIRK_HAS_HW_APRIV              BIT(3)
>  #define ADRENO_QUIRK_HAS_CACHED_COHERENT       BIT(4)
> +#define ADRENO_QUIRK_PREEMPTION                        BIT(5)
>
>  /* Helper for formating the chip_id in the way that userspace tools like
>   * crashdec expect.
>
> --
> 2.46.1
>