* [PATCH v2] drm/panfrost: Handle IDVS_GROUP_SIZE feature
@ 2022-02-11 14:58 alyssa.rosenzweig
2022-02-11 15:01 ` Steven Price
0 siblings, 1 reply; 2+ messages in thread
From: alyssa.rosenzweig @ 2022-02-11 14:58 UTC (permalink / raw)
To: dri-devel; +Cc: tomeu.vizoso, airlied, steven.price, Alyssa Rosenzweig
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>
---
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
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] drm/panfrost: Handle IDVS_GROUP_SIZE feature
2022-02-11 14:58 [PATCH v2] drm/panfrost: Handle IDVS_GROUP_SIZE feature alyssa.rosenzweig
@ 2022-02-11 15:01 ` Steven Price
0 siblings, 0 replies; 2+ messages in thread
From: Steven Price @ 2022-02-11 15:01 UTC (permalink / raw)
To: alyssa.rosenzweig, dri-devel; +Cc: airlied, tomeu.vizoso
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
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-02-11 15:01 ` Steven Price
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