drm/amdkfd: Ignore bogus signals from MEC efficiently

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MEC firmware sometimes sends signal interrupts without a valid context ID
on end of pipe events that don't intend to signal any HSA signals.
This triggers the slow path in kfd_signal_event_interrupt that scans the
entire event page for signaled events. Detect these signals in the top
half interrupt handler to stop processing them as early as possible.

Because we now always treat event ID 0 as invalid, reserve that ID during
process initialization.

v2: Update firmware version checks to support more GPUs

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Philip Yang <Philip.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Felix Kuehling 2022-04-07 18:53:56 -04:00 • committed by Alex Deucher

parent b3ef3205bc

commit c3eb12dff0

4 changed files with 60 additions and 7 deletions

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22

drivers/gpu/drm/amd/amdkfd/kfd_events.c

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33

drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c

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2

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

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10

drivers/gpu/drm/amd/amdkfd/kfd_process.c

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