mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-10 11:40:19 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/amdkfd: Tie UNMAP_LATENCY to queue_preemption

Browse Source 
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>
This commit is contained in:
Amber Lin
2025-08-15 14:04:15 -04:00
committed by Alex Deucher
parent 181d7dcc58
commit f3820e9d35
1 changed files with 8 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@@ -111,7 +111,14 @@
#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)
#define KFD_MAX_SDMA_QUEUES 128