marfrit
a4e7d8ab90
panvk-bifrost campaigns (r1..r4 Vulkan compositor + r5.video1 Vulkan
video decode) shipped before this repo existed; the deliverable
patches live in marfrit-packages, but the reasoning chain, phase docs,
and source-state evidence lived only in local working trees on the
development host.
This retrofit imports:
- mesa-panvk-bifrost/ — r1..r4 era phase docs (iter1..iter18)
(libmali stub blobs at iter18/blob/ excluded
— 109MB of RE artifacts replaced with a README
pointer)
- mesa-panvk-bifrost-video/ — sibling campaign phase docs + probe
- evidence/ — frozen .tgz source snapshots at each milestone
(basis for the 0005 patch diff generation)
Future iterations should branch off here from day one, so each iter is
a commit rather than a snapshot. See [[feedback-session-local-process-pins]]
for the process drift this retrofit closes.
Total: 1.9 MB across 124 files.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
58 lines
2.6 KiB
Diff
58 lines
2.6 KiB
Diff
From: claude-noether (on behalf of mfritsche)
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Date: 2026-05-19
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Subject: panvk: expose VK_KHR/EXT_robustness2 + nullDescriptor on Bifrost (PAN_ARCH 6/7)
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Without this, Mesa's Zink driver refuses to use PanVk-Bifrost as its Vulkan
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backend, falling back silently to llvmpipe (software rasterizer) for all
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GL-via-Zink on Bifrost SBCs. That defeats the entire purpose of having a
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Vulkan driver on Bifrost — GL acceleration via Zink is the most natural
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near-term consumer.
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panvk_vX_nir_lower_descriptors.c:1309 and panvk_vX_shader.c:1355 already
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plumb dev->vk.enabled_features.nullDescriptor arch-agnostically — the gate
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at panvk_vX_physical_device.c was set conservatively when Bifrost was
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unmaintained, not because of hardware incapability.
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iter1–7 of the panvk-bifrost campaign proved fundamental driver functions
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on Mali-G52 r1 MC1 (PAN_ARCH=7). This patch is the iter8 follow-up.
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robustBufferAccess2 and robustImageAccess2 are NOT flipped — they're
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independent rb2 features Zink doesn't require, gated differently
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(robustBufferAccess2 = PAN_ARCH >= 11, robustImageAccess2 = false), and
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out of scope for iter8.
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---
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src/panfrost/vulkan/panvk_vX_physical_device.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/src/panfrost/vulkan/panvk_vX_physical_device.c b/src/panfrost/vulkan/panvk_vX_physical_device.c
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--- a/src/panfrost/vulkan/panvk_vX_physical_device.c
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+++ b/src/panfrost/vulkan/panvk_vX_physical_device.c
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@@ -91,7 +91,7 @@ get_device_extensions(const struct panvk_physical_device *device,
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.KHR_pipeline_binary = true,
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.KHR_pipeline_executable_properties = true,
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.KHR_pipeline_library = true,
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- .KHR_robustness2 = PAN_ARCH >= 10,
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+ .KHR_robustness2 = true,
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.KHR_sampler_mirror_clamp_to_edge = true,
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.KHR_sampler_ycbcr_conversion = true,
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.KHR_separate_depth_stencil_layouts = true,
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@@ -168,7 +168,7 @@ get_device_extensions(const struct panvk_physical_device *device,
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.EXT_queue_family_foreign = true,
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.EXT_robustness = pan_arch(device->kmod.dev->props.gpu_id) >= 9,
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.EXT_image_robustness = true,
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- .EXT_robustness2 = PAN_ARCH >= 10,
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+ .EXT_robustness2 = true,
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.EXT_sampler_filter_minmax = PAN_ARCH >= 10,
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.EXT_scalar_block_layout = true,
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.EXT_separate_stencil_usage = true,
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@@ -493,7 +493,7 @@ get_device_features(const struct panvk_physical_device *device,
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/* VK_KHR_robustness2 */
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.robustBufferAccess2 = PAN_ARCH >= 11,
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.robustImageAccess2 = false,
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- .nullDescriptor = PAN_ARCH >= 10,
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+ .nullDescriptor = true,
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/* VK_KHR_shader_clock */
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.shaderSubgroupClock = device->kmod.dev->props.gpu_can_query_timestamp,
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