Documentation/gpu: Add an explanation about the DCN pipeline

In the DCN code, we constantly talk about hardware pipeline, pipeline,
or even just pipes, which is a concept that is not obvious to everyone.
For this reason, this commit expands the DCN overview explanation by
adding a new section that describes what a pipeline is from the DCN
perspective.

Changes since V1:
- Rewrite the first paragraph that describes AMD hardware pipeline.

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Cc: Hersen Wu <hersenxs.wu@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Simon Ser <contact@emersion.fr>
Cc: Pekka Paalanen <pekka.paalanen@collabora.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Mark Yacoub <markyacoub@chromium.org>
Cc: Pierre-Loup <pgriffais@valvesoftware.com>
Cc: Michel Dänzer <michel.daenzer@mailbox.org>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rodrigo Siqueira 2022-08-11 11:48:18 -04:00 committed by Alex Deucher
parent 9d9b217d52
commit 330d6da3d0
3 changed files with 2079 additions and 0 deletions

View file

@ -124,6 +124,65 @@ depth format), bit-depth reduction/dithering would kick in. In OPP, we would
also apply a regamma function to introduce the gamma removed earlier back.
Eventually, we output data in integer format at DIO.
AMD Hardware Pipeline
---------------------
When discussing graphics on Linux, the **pipeline** term can sometimes be
overloaded with multiple meanings, so it is important to define what we mean
when we say **pipeline**. In the DCN driver, we use the term **hardware
pipeline** or **pipeline** or just **pipe** as an abstraction to indicate a
sequence of DCN blocks instantiated to address some specific configuration. DC
core treats DCN blocks as individual resources, meaning we can build a pipeline
by taking resources for all individual hardware blocks to compose one pipeline.
In actuality, we can't connect an arbitrary block from one pipe to a block from
another pipe; they are routed linearly, except for DSC, which can be
arbitrarily assigned as needed. We have this pipeline concept for trying to
optimize bandwidth utilization.
.. kernel-figure:: pipeline_4k_no_split.svg
Additionally, let's take a look at parts of the DTN log (see
'Documentation/gpu/amdgpu/display/dc-debug.rst' for more information) since
this log can help us to see part of this pipeline behavior in real-time::
HUBP: format addr_hi width height ...
[ 0]: 8h 81h 3840 2160
[ 1]: 0h 0h 0 0
[ 2]: 0h 0h 0 0
[ 3]: 0h 0h 0 0
[ 4]: 0h 0h 0 0
...
MPCC: OPP DPP ...
[ 0]: 0h 0h ...
The first thing to notice from the diagram and DTN log it is the fact that we
have different clock domains for each part of the DCN blocks. In this example,
we have just a single **pipeline** where the data flows from DCHUB to DIO, as
we intuitively expect. Nonetheless, DCN is flexible, as mentioned before, and
we can split this single pipe differently, as described in the below diagram:
.. kernel-figure:: pipeline_4k_split.svg
Now, if we inspect the DTN log again we can see some interesting changes::
HUBP: format addr_hi width height ...
[ 0]: 8h 81h 1920 2160 ...
...
[ 4]: 0h 0h 0 0 ...
[ 5]: 8h 81h 1920 2160 ...
...
MPCC: OPP DPP ...
[ 0]: 0h 0h ...
[ 5]: 0h 5h ...
From the above example, we now split the display pipeline into two vertical
parts of 1920x2160 (i.e., 3440x2160), and as a result, we could reduce the
clock frequency in the DPP part. This is not only useful for saving power but
also to better handle the required throughput. The idea to keep in mind here is
that the pipe configuration can vary a lot according to the display
configuration, and it is the DML's responsibility to set up all required
configuration parameters for multiple scenarios supported by our hardware.
Global Sync
-----------

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@ -0,0 +1,958 @@
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