[PATCH 2/3] Documentation/gpu: Add an explanation about the DCN pipeline

Rodrigo Siqueira Rodrigo.Siqueira at amd.com
Mon Jun 13 20:01:11 UTC 2022


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.

Cc: Harry Wentland <harry.wentland at amd.com>
Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas at amd.com>
Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
Cc: Hersen Wu <hersenxs.wu at amd.com>
Cc: Alex Hung <alex.hung at amd.com>
Cc: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Cc: Leo Li <sunpeng.li at amd.com>
Cc: Simon Ser <contact at emersion.fr>
Cc: Pekka Paalanen <pekka.paalanen at collabora.com>
Cc: Sean Paul <seanpaul at chromium.org>
Cc: Mark Yacoub <markyacoub at chromium.org>
Cc: Pierre-Loup <pgriffais at valvesoftware.com>
Cc: Michel Dänzer <michel.daenzer at mailbox.org>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 .../gpu/amdgpu/display/dcn-overview.rst       |   58 +
 .../amdgpu/display/pipeline_4k_no_split.svg   |  958 +++++++++++++++
 .../gpu/amdgpu/display/pipeline_4k_split.svg  | 1062 +++++++++++++++++
 3 files changed, 2078 insertions(+)
 create mode 100644 Documentation/gpu/amdgpu/display/pipeline_4k_no_split.svg
 create mode 100644 Documentation/gpu/amdgpu/display/pipeline_4k_split.svg

diff --git a/Documentation/gpu/amdgpu/display/dcn-overview.rst b/Documentation/gpu/amdgpu/display/dcn-overview.rst
index f98624d7828e..430e363fccae 100644
--- a/Documentation/gpu/amdgpu/display/dcn-overview.rst
+++ b/Documentation/gpu/amdgpu/display/dcn-overview.rst
@@ -124,6 +124,64 @@ 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 is often overloaded
+with multiple meanings, and DCN adds another context to this word. In the DCN
+driver, we use the term **hardware pipeline** or  **pipeline** or just **pipe**
+to indicate how many DCN blocks we are instantiating to address some specific
+configuration. DCN composes those pipelines together when the data reach the
+end of the OPTC block before sending it to the display. We have this pipeline
+concept for trying to save energy and optimize bandwidth utilization while
+providing the maximum performance per watt. It is easier to discuss it if we
+dive into this topic by taking the example of a 4k display in the below
+example:
+
+.. 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
 -----------
 
diff --git a/Documentation/gpu/amdgpu/display/pipeline_4k_no_split.svg b/Documentation/gpu/amdgpu/display/pipeline_4k_no_split.svg
new file mode 100644
index 000000000000..5fa289d99fcd
--- /dev/null
+++ b/Documentation/gpu/amdgpu/display/pipeline_4k_no_split.svg
@@ -0,0 +1,958 @@
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-- 
2.25.1



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