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Message-Id: <20240926-preemption-a750-t-v6-10-7b6e1ef3648f@gmail.com>
Date: Thu, 26 Sep 2024 23:16:52 +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 v6 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 +
drivers/gpu/drm/msm/msm_submitqueue.c | 6 +++++-
5 files changed, 17 insertions(+), 3 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.
diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c
index 9b3ffca3f3b471f509918edd4a2fdb0f80dfeb06..2fc3eaf81f4461990d48065f67bf5477787708e9 100644
--- a/drivers/gpu/drm/msm/msm_submitqueue.c
+++ b/drivers/gpu/drm/msm/msm_submitqueue.c
@@ -161,6 +161,8 @@ int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
struct msm_drm_private *priv = drm->dev_private;
struct msm_gpu_submitqueue *queue;
enum drm_sched_priority sched_prio;
+ extern int enable_preemption;
+ bool preemption_supported;
unsigned ring_nr;
int ret;
@@ -170,7 +172,9 @@ int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
if (!priv->gpu)
return -ENODEV;
- if (flags & MSM_SUBMITQUEUE_ALLOW_PREEMPT && priv->gpu->nr_rings == 1)
+ preemption_supported = priv->gpu->nr_rings == 1 && enable_preemption != 0;
+
+ if (flags & MSM_SUBMITQUEUE_ALLOW_PREEMPT && preemption_supported)
return -EINVAL;
ret = msm_gpu_convert_priority(priv->gpu, prio, &ring_nr, &sched_prio);
--
2.46.1
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