drm/amd/display: Add tracing to dc

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[Why]
Tracing is a useful and cheap debug functionality

[How]
This creates a new trace system amdgpu_dm, currently with
three trace events

amdgpu_dc_rreg and amdgpu_dc_wreg report the address and value
of any dc register reads and writes

amdgpu_dc_performance requires at least one of those two to be
enabled.  It counts the register reads and writes since the
last entry

v2: Don't check for NULL before kfree

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

David Francis 2018-11-30 09:57:06 -05:00 • committed by Alex Deucher

parent 5d66ef38bc

commit 0cf5eb76e2

6 changed files with 146 additions and 4 deletions

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3

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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104

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h

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19

drivers/gpu/drm/amd/display/dc/core/dc.c

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8

drivers/gpu/drm/amd/display/dc/dc_types.h

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4

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c

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12

drivers/gpu/drm/amd/display/dc/dm_services.h

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