Re: [PATCH v3 00/38] drm/msm/dpu: rework HW catalog

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On 03/04/2023 21:06, Abhinav Kumar wrote:


On 3/30/2023 2:52 PM, Dmitry Baryshkov wrote:
This huge series attempts to restructure the DPU HW catalog into a
manageable and reviewable data set. In order to ease review and testing
I merged all the necessary fixes into this series. Also I cherry-picked
& slightly fixed Konrad's patch adding size to the SSPP and INTF macros.


I had to first dig up some history about why dpu catalog grew so much in the first place before starting this review. When the DPU driver first landed (which pre-dates my work in upstream), it looks like it followed mdp5 model from mdp5_cfg.c. But looks like as the number of chipsets which use DPU kept growing, this is becoming a burden.

As everyone knows, downstream follows a devicetree model for the dpu hardware and that should have always been the case. Perhaps in the last 2-3 years more time could have been spent on standardizing the bindings used for hw blocks in order to maintain a less hard-coded catalog file and more in the device tree.

Unfortunately, this is not how the upstream DT works. If something is a constant hardware property, it should not go into the DT. So pushing catalog to dt would have been immediately frowned upon by Rob Herring or Krzysztof.

Then the catalog would have just been a place to parse the device tree, set the feature capability based on chipset (refer _sde_hardware_pre_caps). That way offsets , number of blocks and the blocks themselves still come from the device tree but perhaps some specific features are at SOC level for which the catalog still stays.

That being said, I thought of different strategies even before the review but two issues prevented me from suggesting those ideas (one of which I am seeing even here , which I am going to suggest below and also suggest why it wont work).

1) For the same DPU major/minor version, some features might get dropped or even get added with different SOCs as overall the system capabilities might differ like number of SSPPs or memory footprint of the SOC etc.

So there is no good way right now to generalize any dpu catalog or to tie it with a DPU major/minor version. We will have to stick with a per-SOC model.

Up to now, the SoC was equal to major+minor. Could you please be more specific here, if there are any actual differences within major+minor families?


This is what led me to not pursue that route.

2) For the same DPU major/minor version, even if core-DPU is same (in terms of SSPP, DSPP etc), the number of interfaces can change. So again no room to generalize same DPU hw version.

Again, I might be just scratching the surface, but I have not observed this.


3) For the same reason as (1) and (2), I think the de-duplication strategy used in this series is not correct. The idea of dpu_hw_version_num_layer_mixer is just not scalable as I dont know how many variants that will lead to. So it seems like just an attempt to de-duplicate which perhaps works today for existing dpu chipsets in upstream but by no means scalable. Lets go ahead with per-SOC catalog file but lets live with some amount of duplication between them if we really have to split it across header files.

Indeed, this leads to minor differences on top of major+lm. However, I think, the overall complexity is lowered.

Nevertheless, let's land the major set of patches and leave generalization for the later time. I think, with the addition of the next several platforms we will see the drill.

I also thought of similar strategies to generalize like based on sub-blocks similar to what you have done but all of these were NAKed internally by folks who work on more chipsets / have more visibility into the spread of features across chipsets.

First 4 patches clean up the catalog a bit in order to make it more
suitable for refactoring.


These are okay. I will address your follow-up questions about patch (1) and lets land these.

Then the next batch of 13 + 5 patches split the hw catalog entries into
per-SoC files.


This part is also fine. But perhaps dont have dpu hw version in the file. So just dpu_hw_sm8250.h or dpu_hw_sm8350.h etc.

Having a version makes it easier to compare chipsets (and also to verify that feature masks are correct), so I'd like to retain it.


Next 9 patches rework catalog entries, mostly targeting deduplication of
data used by several platforms. At this moment only three pairs (out of
13 devices supported by DPU) are merged. However this part lays out the
ground to ease adding support for new platforms, some of which use the
same configuration as the existing platforms


This is the part I suggest we drop.

Last batch of 7 patches renames existing macros to ease using them while
adding support for new devices.


I have to check this part but perhaps after re-basing based on my earlier comment.

Ack, I'll see what I can drop and what is going to be there.

Up to now there were some natural shares, like sm8150 vs sc8180x and qcm2290 vs sm6115. Do you think we should populate the missing parts by duplicate the data?


This pile of patches is submitted in a single batch to allow one to
observe the final goal of the cleanup which otherwise might be hard to
assess.


Changes since v2:
- Fixed sc8280xp SSPP size to 0x2ac
- Rebased on top of msm-next-lumag, dropped merged patches

Changes since v1:
- Picked up Konrad's patch
- Picked up dependencies into the main series
- Moved qseed3lite vs qseed4 patches into the fixes part
- Fixed sm6115 in a similar manner.

Dmitry Baryshkov (37):
   drm/msm/dpu: constify DSC data structures
   drm/msm/dpu: mark remaining pp data as const
   drm/msm/dpu: move UBWC/memory configuration to separate struct
   drm/msm/dpu: split SM8550 catalog entry to the separate file
   drm/msm/dpu: split SM8450 catalog entry to the separate file
   drm/msm/dpu: split SC8280XP catalog entry to the separate file
   drm/msm/dpu: split SC7280 catalog entry to the separate file
   drm/msm/dpu: split SM8350 catalog entry to the separate file
   drm/msm/dpu: split SM6115 catalog entry to the separate file
   drm/msm/dpu: split QCM2290 catalog entry to the separate file
   drm/msm/dpu: split SC7180 catalog entry to the separate file
   drm/msm/dpu: split SM8250 catalog entry to the separate file
   drm/msm/dpu: split SC8180X catalog entry to the separate file
   drm/msm/dpu: split SM8150 catalog entry to the separate file
   drm/msm/dpu: split MSM8998 catalog entry to the separate file
   drm/msm/dpu: split SDM845 catalog entry to the separate file
   drm/msm/dpu: duplicate sdm845 catalog entries
   drm/msm/dpu: duplicate sc7180 catalog entries
   drm/msm/dpu: duplicate sm8150 catalog entries
   drm/msm/dpu: duplicate sm8250 catalog entries
   drm/msm/dpu: duplicate sm8350 catalog entries
   drm/msm/dpu: use defined symbol for sc8280xp's maxwidth
   drm/msm/dpu: catalog: add comments regarding DPU_CTL_SPLIT_DISPLAY
   drm/msm/dpu: enable DPU_CTL_SPLIT_DISPLAY for sc8280xp
   drm/msm/dpu: enable DSPP_2/3 for LM_2/3 on sm8450
   drm/msm/dpu: drop duplicate vig_sblk instances
   drm/msm/dpu: enable DSPP on sc8180x
   drm/msm/dpu: deduplicate sc8180x with sm8150
   drm/msm/dpu: deduplicate sm6115 with qcm2290
   drm/msm/dpu: deduplicate sc8280xp with sm8450
   drm/msm/dpu: drop unused macros from hw catalog
   drm/msm/dpu: inline IRQ_n_MASK defines
   drm/msm/dpu: rename INTF_foo_MASK to contain major DPU version
   drm/msm/dpu: rename CTL_foo_MASK to contain major DPU version
   drm/msm/dpu: rename VIG and DMA_foo_MASK to contain major DPU version
   drm/msm/dpu: rename MIXER_foo_MASK to contain major DPU version
   drm/msm/dpu: rename MERGE_3D_foo_MASK to contain major DPU version

Konrad Dybcio (1):
   drm/msm/dpu: Allow variable SSPP/INTF_BLK size

  .../msm/disp/dpu1/catalog/dpu_3_0_msm8998.h   |  210 ++
  .../msm/disp/dpu1/catalog/dpu_4_0_sdm845.h    |  210 ++
  .../msm/disp/dpu1/catalog/dpu_5_0_sm8150.h    |   97 +
  .../msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h   |   91 +
  .../gpu/drm/msm/disp/dpu1/catalog/dpu_5_lm6.h |  152 ++
  .../msm/disp/dpu1/catalog/dpu_6_0_sm8250.h    |  244 ++
  .../msm/disp/dpu1/catalog/dpu_6_2_sc7180.h    |  151 ++
  .../msm/disp/dpu1/catalog/dpu_6_3_sm6115.h    |   91 +
  .../msm/disp/dpu1/catalog/dpu_6_5_qcm2290.h   |   83 +
  .../gpu/drm/msm/disp/dpu1/catalog/dpu_6_lm1.h |   53 +
  .../msm/disp/dpu1/catalog/dpu_7_0_sm8350.h    |  226 ++
  .../msm/disp/dpu1/catalog/dpu_7_2_sc7280.h    |  158 ++
  .../msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h  |  136 ++
  .../msm/disp/dpu1/catalog/dpu_8_1_sm8450.h    |  142 ++
  .../gpu/drm/msm/disp/dpu1/catalog/dpu_8_lm6.h |   99 +
  .../msm/disp/dpu1/catalog/dpu_9_0_sm8550.h    |  209 ++
  .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c    | 2175 +----------------
  .../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h    |   37 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c    |    4 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.c   |   18 +-
  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp.h   |    4 +-
  21 files changed, 2443 insertions(+), 2147 deletions(-)
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_3_0_msm8998.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_4_0_sdm845.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_0_sm8150.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_1_sc8180x.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_5_lm6.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_0_sm8250.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_2_sc7180.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_3_sm6115.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_5_qcm2290.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_6_lm1.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_0_sm8350.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_0_sc8280xp.h   create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_1_sm8450.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_8_lm6.h
  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_9_0_sm8550.h


--
With best wishes
Dmitry




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