drm/amdkfd: Fix race between scheduler and context restore

Browse source

The scheduler may raise SQ_WAVE_STATUS.SPI_PRIO via SQ_CMD before
context restore has completed. Restoring SPI_PRIO=0 after this point
may cause context save to fail as the lower priority wavefronts
are not selected for execution among spin-waiting wavefronts.

Leave SPI_PRIO at its SPI-initialized or scheduler-raised value.

v2: Also fix race with exception handler

Signed-off-by: Jay Cornwall <Jay.Cornwall@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

...

This commit is contained in:

Jay Cornwall 2018-07-11 22:32:46 -04:00 • committed by Oded Gabbay

parent 1cd106ecfc

commit a60d811b2b

3 changed files with 262 additions and 230 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

498

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h

View file

18

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx8.asm

View file

16

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx9.asm

View file