On 11/02/2022 14:58, alyssa.rosenzweig@collabora.com wrote:

From: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com

The IDVS group size feature was missing. It is used on some Bifrost and Valhall GPUs, and is the last kernel-relevant Bifrost feature we're missing.

This feature adds an extra IDVS group size field to the JM_CONFIG register. In kbase, the value is configurable via the device tree; kbase uses 0xF as a default if no value is specified. Until we find a device demanding otherwise, let's always set the 0xF default on devices which support this feature mimicking kbase's behaviour.

Tuning this register slightly improves performance of index-driven vertex shading. On Mali-G52 (with Mesa), overall glmark2 score is improved from 1026 to 1037. Geometry-heavy scenes like -bshading are improved from 1068 to 1098.

Signed-off-by: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com

Reviewed-by: Steven Price steven.price@arm.com

---

drivers/gpu/drm/panfrost/panfrost_features.h | 3 +++ drivers/gpu/drm/panfrost/panfrost_gpu.c | 3 +++ drivers/gpu/drm/panfrost/panfrost_regs.h | 1 + 3 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_features.h b/drivers/gpu/drm/panfrost/panfrost_features.h index 34f2bae1ec8c..36fadcf9634e 100644 --- a/drivers/gpu/drm/panfrost/panfrost_features.h +++ b/drivers/gpu/drm/panfrost/panfrost_features.h @@ -20,6 +20,7 @@ enum panfrost_hw_feature { HW_FEATURE_AARCH64_MMU, HW_FEATURE_TLS_HASHING, HW_FEATURE_THREAD_GROUP_SPLIT,

• HW_FEATURE_IDVS_GROUP_SIZE, HW_FEATURE_3BIT_EXT_RW_L2_MMU_CONFIG,

};

@@ -74,6 +75,7 @@ enum panfrost_hw_feature { BIT_ULL(HW_FEATURE_FLUSH_REDUCTION) | \ BIT_ULL(HW_FEATURE_PROTECTED_MODE) | \ BIT_ULL(HW_FEATURE_PROTECTED_DEBUG_MODE) | \

• BIT_ULL(HW_FEATURE_IDVS_GROUP_SIZE) | \ BIT_ULL(HW_FEATURE_COHERENCY_REG))

#define hw_features_g76 (\ @@ -87,6 +89,7 @@ enum panfrost_hw_feature { BIT_ULL(HW_FEATURE_COHERENCY_REG) | \ BIT_ULL(HW_FEATURE_AARCH64_MMU) | \ BIT_ULL(HW_FEATURE_TLS_HASHING) | \

• BIT_ULL(HW_FEATURE_IDVS_GROUP_SIZE) | \ BIT_ULL(HW_FEATURE_3BIT_EXT_RW_L2_MMU_CONFIG))

#define hw_features_g31 (\ diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c index bbe628b306ee..50c8922694d7 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c @@ -145,6 +145,9 @@ static void panfrost_gpu_init_quirks(struct panfrost_device *pfdev) quirks |= (COHERENCY_ACE_LITE | COHERENCY_ACE) << JM_FORCE_COHERENCY_FEATURES_SHIFT;

• if (panfrost_has_hw_feature(pfdev, HW_FEATURE_IDVS_GROUP_SIZE))

• quirks |= JM_DEFAULT_IDVS_GROUP_SIZE << JM_IDVS_GROUP_SIZE_SHIFT;
  

• if (quirks) gpu_write(pfdev, GPU_JM_CONFIG, quirks);

diff --git a/drivers/gpu/drm/panfrost/panfrost_regs.h b/drivers/gpu/drm/panfrost/panfrost_regs.h index 6c5a11ef1ee8..16e776cc82ea 100644 --- a/drivers/gpu/drm/panfrost/panfrost_regs.h +++ b/drivers/gpu/drm/panfrost/panfrost_regs.h @@ -208,6 +208,7 @@ #define JM_MAX_JOB_THROTTLE_LIMIT 0x3F #define JM_FORCE_COHERENCY_FEATURES_SHIFT 2 #define JM_IDVS_GROUP_SIZE_SHIFT 16 +#define JM_DEFAULT_IDVS_GROUP_SIZE 0xF #define JM_MAX_IDVS_GROUP_SIZE 0x3F