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The RX 6000 reports of 0.9.1 and 0.9.2 ran the completion callbacks of submissions the GPU never finished before any call returned VK_ERROR_DEVICE_LOST, although the completion thread polled the device first. Every value a queue hand-over or a host signal gives the submissions' timeline or the executed timeline is now noted before the signal (vk_sync_hw.h); the completion thread and the wait after a submit end the run when a timeline reads above that note. The first occlusion query found unwritten after its fence logs its submission, the submissions' values, both timelines' readings and the GPU breadcrumbs, and the lost device's report starts with the same line, so the next report shows whether the driver gave a value above the note. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
24 lines
1.6 KiB
C
24 lines
1.6 KiB
C
// The newest value each of the replay's timelines may reach, and the test a value read from one of them must pass
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// (vk_sync.c "a lost device in the timelines' values"). Header only, so that tests/sync_hw_check.c checks it without a
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// device.
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//
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// A timeline semaphore changes only through signal operations, and each of them carries a value the program chose:
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// for the replay's two timelines, the queue hand-overs of its submissions (vk_sync.c hold_flush_locked) and the host's
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// own signals (vk_sync.c vk_sync_start's restart, the lost-device probe, vk_device.c vk_selftest). A live device never
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// reports a value above the newest of them. Each such value is noted here before its signal can happen, so a value read
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// above the note comes from a device that answers for work it never ran: after a timeout reset, Windows releases every
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// waiter of a timeline, and the reports of AMD's RX 6000 cards (0.9.1, 0.9.2) ran the completion callbacks of
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// submissions the GPU had not finished ("occlusion query slot ... not available after its fence") before any call
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// returned VK_ERROR_DEVICE_LOST.
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#pragma once
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#include <stdint.h>
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// Raises the note *hw to v; never lowers it. Any thread.
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static inline void sync_hw_raise(volatile uint64_t *hw, uint64_t v) {
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uint64_t o = __atomic_load_n(hw, __ATOMIC_RELAXED);
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while (v > o && !__atomic_compare_exchange_n(hw, &o, v, 1, __ATOMIC_RELEASE, __ATOMIC_RELAXED)) {}
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}
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// 1 when raw, read from a timeline whose signals were all noted in hw (read after raw), is above every one of them.
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static inline int sync_hw_beyond(uint64_t raw, uint64_t hw) { return raw > hw; }
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