drm/amdgpu: LSDMA supports multiple threads

Browse source

Add mutex to serialize LSDMA PIO copy and fill operations for
concurrent access from multiple threads.

A mutex is used rather than a spinlock because the underlying
lsdma_v7_1_wait_pio_status() polls with udelay(), which can
busy-wait for up to usec_timeout microseconds.

It is optional to call mutex_destroy for clarity and debug
correctness, it is no-op for release build, leave it as lsdma
block no ip callback funcs to call mutex_destroy.

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

...

This commit is contained in:

Philip Yang 2026-03-19 16:59:14 -04:00 • committed by Alex Deucher

parent 32e1f992b3

commit a3b523ed4c

3 changed files with 16 additions and 6 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

1

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

View file

20

drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.c

View file

1

drivers/gpu/drm/amd/amdgpu/amdgpu_lsdma.h

View file