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drm/amdkfd: Tie UNMAP_LATENCY to queue_preemption

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[ Upstream commit f3820e9d356132e18405cd7606e22dc87ccfa6d1 ]

When KFD asks CP to preempt queues, other than preempt CP queues, CP
also requests SDMA to preempt SDMA queues with UNMAP_LATENCY timeout.
Currently queue_preemption_timeout_ms is 9000 ms by default but can be
configured via module parameter. KFD_UNMAP_LATENCY_MS is hard coded as
4000 ms though. This patch ties KFD_UNMAP_LATENCY_MS to
queue_preemption_timeout_ms so in a slow system such as emulator, both
CP and SDMA slowness are taken into account.

Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Amber Lin 2025-08-15 14:04:15 -04:00 • committed by Greg Kroah-Hartman
commit eb6e1fb9b9
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
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@ -105,7 +105,14 @@
#define KFD_KERNEL_QUEUE_SIZE 2048
#define KFD_UNMAP_LATENCY_MS (4000)
/* KFD_UNMAP_LATENCY_MS is the timeout CP waiting for SDMA preemption. One XCC
* can be associated to 2 SDMA engines. queue_preemption_timeout_ms is the time
* driver waiting for CP returning the UNMAP_QUEUE fence. Thus the math is
* queue_preemption_timeout_ms = sdma_preemption_time * 2 + cp workload
* The format here makes CP workload 10% of total timeout
*/
#define KFD_UNMAP_LATENCY_MS \
((queue_preemption_timeout_ms - queue_preemption_timeout_ms / 10) >> 1)
/*
* 512 = 0x200