linux-kernel - [PATCH v2 6/9] drm/panfrost: Add "clean only safe" feature bit

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Date:   Wed, 25 May 2022 10:57:51 -0400
From:   Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 6/9] drm/panfrost: Add "clean only safe" feature bit

Add the HW_FEATURE_CLEAN_ONLY_SAFE bit based on kbase. When I actually
tried to port the logic from kbase, trivial jobs raised Data Invalid
Faults, so this may depend on other coherency details. It's still useful
to have the bit to record the feature bit when adding new models.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Reviewed-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panfrost/panfrost_features.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_features.h b/drivers/gpu/drm/panfrost/panfrost_features.h
index 36fadcf9634e..1a8bdebc86a3 100644
--- a/drivers/gpu/drm/panfrost/panfrost_features.h
+++ b/drivers/gpu/drm/panfrost/panfrost_features.h
@@ -21,6 +21,7 @@ enum panfrost_hw_feature {
 	HW_FEATURE_TLS_HASHING,
 	HW_FEATURE_THREAD_GROUP_SPLIT,
 	HW_FEATURE_IDVS_GROUP_SIZE,
+	HW_FEATURE_CLEAN_ONLY_SAFE,
 	HW_FEATURE_3BIT_EXT_RW_L2_MMU_CONFIG,
 };
 
-- 
2.35.1