Re: [PATCH v6 0/3] Disable automatic load CCS load balancing

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On 20/03/2024 15:06, Andi Shyti wrote:
Ping! Any thoughts here?

I only casually observed the discussion after I saw Matt suggested further simplifications. As I understood it, you will bring back the uabi engine games when adding the dynamic behaviour and that is fine by me.

Regards,

Tvrtko

On Wed, Mar 13, 2024 at 09:19:48PM +0100, Andi Shyti wrote:
Hi,

this series does basically two things:

1. Disables automatic load balancing as adviced by the hardware
    workaround.

2. Assigns all the CCS slices to one single user engine. The user
    will then be able to query only one CCS engine

>From v5 I have created a new file, gt/intel_gt_ccs_mode.c where
I added the intel_gt_apply_ccs_mode(). In the upcoming patches,
this file will contain the implementation for dynamic CCS mode
setting.

Thanks Tvrtko, Matt, John and Joonas for your reviews!

Andi

Changelog
=========
v5 -> v6 (thanks Matt for the suggestions in v6)
  - Remove the refactoring and the for_each_available_engine()
    macro and instead do not create the intel_engine_cs structure
    at all.
  - In patch 1 just a trivial reordering of the bit definitions.

v4 -> v5
  - Use the workaround framework to do all the CCS balancing
    settings in order to always apply the modes also when the
    engine resets. Put everything in its own specific function to
    be executed for the first CCS engine encountered. (Thanks
    Matt)
  - Calculate the CCS ID for the CCS mode as the first available
    CCS among all the engines (Thanks Matt)
  - create the intel_gt_ccs_mode.c function to host the CCS
    configuration. We will have it ready for the next series.
  - Fix a selftest that was failing because could not set CCS2.
  - Add the for_each_available_engine() macro to exclude CCS1+ and
    start using it in the hangcheck selftest.

v3 -> v4
  - Reword correctly the comment in the workaround
  - Fix a buffer overflow (Thanks Joonas)
  - Handle properly the fused engines when setting the CCS mode.

v2 -> v3
  - Simplified the algorithm for creating the list of the exported
    uabi engines. (Patch 1) (Thanks, Tvrtko)
  - Consider the fused engines when creating the uabi engine list
    (Patch 2) (Thanks, Matt)
  - Patch 4 now uses a the refactoring from patch 1, in a cleaner
    outcome.

v1 -> v2
  - In Patch 1 use the correct workaround number (thanks Matt).
  - In Patch 2 do not add the extra CCS engines to the exposed
    UABI engine list and adapt the engine counting accordingly
    (thanks Tvrtko).
  - Reword the commit of Patch 2 (thanks John).

Andi Shyti (3):
   drm/i915/gt: Disable HW load balancing for CCS
   drm/i915/gt: Do not generate the command streamer for all the CCS
   drm/i915/gt: Enable only one CCS for compute workload

  drivers/gpu/drm/i915/Makefile               |  1 +
  drivers/gpu/drm/i915/gt/intel_engine_cs.c   | 20 ++++++++---
  drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c | 39 +++++++++++++++++++++
  drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h | 13 +++++++
  drivers/gpu/drm/i915/gt/intel_gt_regs.h     |  6 ++++
  drivers/gpu/drm/i915/gt/intel_workarounds.c | 30 ++++++++++++++--
  6 files changed, 103 insertions(+), 6 deletions(-)
  create mode 100644 drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c
  create mode 100644 drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.h

--
2.43.0




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