On Tue, Sep 17, 2024 at 01:14:20PM +0200, Antonino Maniscalco 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.
>
> Signed-off-by: Antonino Maniscalco <antomani...@gmail.com>
> Tested-by: Neil Armstrong <neil.armstr...@linaro.org> # on SM8650-QRD
> ---
> drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 3 ++-
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 6 +++++-
> drivers/gpu/drm/msm/adreno/adreno_gpu.h | 1 +
> drivers/gpu/drm/msm/msm_drv.c | 4 ++++
> 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 316f23ca9167..0e3041b29419 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 edbcb6d229ba..4760f9469613 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_gpu.h
> b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> index 87098567483b..d1cd53f05de6 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.
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 9c33f4e3f822..7c64b20f5e3b 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -58,6 +58,10 @@ static bool modeset = true;
> MODULE_PARM_DESC(modeset, "Use kernel modesetting [KMS] (1=on (default),
> 0=disable)");
> module_param(modeset, 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);
> +
Is adreno_device.c a better place for adreno specific module params?
-Akhil.
> #ifdef CONFIG_FAULT_INJECTION
> DECLARE_FAULT_ATTR(fail_gem_alloc);
> DECLARE_FAULT_ATTR(fail_gem_iova);
>
> --
> 2.46.0
>
