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tu: Initial support for VK_KHR_calibrated_timestamps on a750

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Starting with a750, the ALWAYS_ON counter is initialized from a loadable
counter in CX power domain, which is never turned off except during a
GPU reset. This means that timestamps should always be monotonic except
if the GPU resets, in which case subsequent submits should return
DEVICE_LOST anyway. Thus it should be good enough to satisfy the Vulkan
requirement that vkCmdWriteTimestamp is monotonic.

kgsl tries to synchronize the CX counter to the CPU counter, and
additionally adds a synchronization ioctl to improve the accuracy. I'm
not sure whether the former is really useful for us, but the latter
should eventually be implemented in drm/msm. However for now we can
expose the extension without any kernel support.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31100>
This commit is contained in:
Connor Abbott
2024-09-09 11:39:43 -04:00
parent c968c5a740
commit dbc4a2e30b
4 changed files with 93 additions and 3 deletions
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docs/features.txt
+2 -2
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@@ -509,7 +509,7 @@ Khronos extensions that are not part of any Vulkan version:
VK_KHR_acceleration_structure DONE (anv/gfx12.5+, lvp, radv/gfx10.3+)
VK_KHR_android_surface not started
VK_KHR_calibrated_timestamps DONE (anv, nvk, radv)
VK_KHR_calibrated_timestamps DONE (anv, nvk, radv, tu/a750+)
VK_KHR_compute_shader_derivatives DONE (anv, nvk, radv)
VK_KHR_cooperative_matrix DONE (anv, radv/gfx11+)
VK_KHR_deferred_host_operations DONE (anv, hasvk, lvp, radv)
@@ -568,7 +568,7 @@ Khronos extensions that are not part of any Vulkan version:
VK_EXT_attachment_feedback_loop_layout DONE (anv, lvp, nvk, radv, tu, v3dv, vn)
VK_EXT_border_color_swizzle DONE (anv, hasvk, lvp, nvk, radv/gfx10+, tu, v3dv, vn)
VK_EXT_buffer_device_address DONE (anv, hasvk, nvk, panvk, radv)
VK_EXT_calibrated_timestamps DONE (anv, hasvk, nvk, lvp, radv, vn)
VK_EXT_calibrated_timestamps DONE (anv, hasvk, nvk, lvp, radv, vn, tu/a750+)
VK_EXT_color_write_enable DONE (anv, hasvk, lvp, nvk, radv, tu, v3dv, vn)
VK_EXT_conditional_rendering DONE (anv, hasvk, lvp, nvk, radv, tu, vn)
VK_EXT_conservative_rasterization DONE (anv, nvk, radv, vn)