Hi,
I think we are at the end of it and hopefully this is the last version. Thanks Matt for having followed this series until here.
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 ========= v7 -> v8 - Just used a different way for removing the first instance of the CCS from the info->engine_mask, as suggested by Matt.
v6 -> v7 - find a more appropriate place where to remove the CCS engines: remove them in init_engine_mask() instead of intel_engines_init_mmio(). (Thanks, Matt) - Add Michal's ACK, thanks Michal!
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 | 17 +++++++++ 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, 104 insertions(+), 2 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