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

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Message-Id: <20240924-preemption-a750-t-v5-10-0be2bf81c187@gmail.com>
Date: Tue, 24 Sep 2024 13:30:45 +0200
From: Antonino Maniscalco <antomani103@...il.com>
To: Rob Clark <robdclark@...il.com>, 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>
Cc: 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, Antonino Maniscalco <antomani103@...il.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v5 10/11] drm/msm/A6xx: Enable preemption for A750

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