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tu: Lower maxMultiviewViewCount to 6

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With multiview, the HW has to dispatch at least ViewCount * 6 fibers per
primitive, since there are up to 6 VS threads per primitive. The HW can
launch multiple GS waves per VS wave but one VS wave must contain the
entire primitive. With ViewCount = 16 there are 96 fibers per
primitive, which is more than we can launch in one wave. To fix this,
lower the maximum view count.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40153>
This commit is contained in:
Connor Abbott 2026-03-24 19:35:57 -04:00 • committed by Marge Bot
parent 3433e53da7
commit 73ab56fd2e
2 changed files with 2 additions and 2 deletions
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2
src/freedreno/vulkan/tu_common.h
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@ -105,7 +105,7 @@
#define SAMPLE_LOCATION_MAX 0.9375f
#define TU_MAX_DRM_DEVICES 8
#define MAX_VIEWS 16
#define MAX_VIEWS 6
#define MAX_HW_SCALED_VIEWS 6
#define MAX_BIND_POINTS 2 /* compute + graphics */
/* match the latest Qualcomm driver which is also a hw limit on later gens */

2
src/freedreno/vulkan/tu_device.cc
View file

@ -899,7 +899,7 @@ tu_get_physical_device_properties_1_1(struct tu_physical_device *pdevice,
p->pointClippingBehavior = VK_POINT_CLIPPING_BEHAVIOR_ALL_CLIP_PLANES;
p->maxMultiviewViewCount =
tu_has_multiview(pdevice) ? MAX_VIEWPORTS : 1;
tu_has_multiview(pdevice) ? MAX_VIEWS : 1;
p->maxMultiviewInstanceIndex = INT_MAX;
p->protectedNoFault = false;
/* Our largest descriptors are 2 texture descriptors, or a texture and