From e9250578ac6278dfd24a57c326eb805b3bdb0e31 Mon Sep 17 00:00:00 2001 From: Andi Shyti Date: Fri, 17 May 2024 11:06:16 +0200 Subject: drm/i915/gt: Fix CCS id's calculation for CCS mode setting [ Upstream commit ee01b6a386eaf9984b58a2476e8f531149679da9 ] The whole point of the previous fixes has been to change the CCS hardware configuration to generate only one stream available to the compute users. We did this by changing the info.engine_mask that is set during device probe, reset during the detection of the fused engines, and finally reset again when choosing the CCS mode. We can't use the engine_mask variable anymore, as with the current configuration, it imposes only one CCS no matter what the hardware configuration is. Before changing the engine_mask for the third time, save it and use it for calculating the CCS mode. After the previous changes, the user reported a performance drop to around 1/4. We have tested that the compute operations, with the current patch, have improved by the same factor. Fixes: 6db31251bb26 ("drm/i915/gt: Enable only one CCS for compute workload") Signed-off-by: Andi Shyti Cc: Chris Wilson Cc: Gnattu OC Cc: Joonas Lahtinen Cc: Matt Roper Tested-by: Jian Ye Reviewed-by: Umesh Nerlige Ramappa Tested-by: Gnattu OC Link: https://patchwork.freedesktop.org/patch/msgid/20240517090616.242529-1-andi.shyti@linux.intel.com (cherry picked from commit a09d2327a9ba8e3f5be238bc1b7ca2809255b464) Signed-off-by: Jani Nikula Signed-off-by: Sasha Levin --- drivers/gpu/drm/i915/gt/intel_engine_cs.c | 6 ++++++ drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c | 2 +- drivers/gpu/drm/i915/gt/intel_gt_types.h | 8 ++++++++ 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c index 7a6dc371c384..bc6209df0f68 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c @@ -919,6 +919,12 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt) if (IS_DG2(gt->i915)) { u8 first_ccs = __ffs(CCS_MASK(gt)); + /* + * Store the number of active cslices before + * changing the CCS engine configuration + */ + gt->ccs.cslices = CCS_MASK(gt); + /* Mask off all the CCS engine */ info->engine_mask &= ~GENMASK(CCS3, CCS0); /* Put back in the first CCS engine */ diff --git a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c index 99b71bb7da0a..3c62a44e9106 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_ccs_mode.c @@ -19,7 +19,7 @@ unsigned int intel_gt_apply_ccs_mode(struct intel_gt *gt) /* Build the value for the fixed CCS load balancing */ for (cslice = 0; cslice < I915_MAX_CCS; cslice++) { - if (CCS_MASK(gt) & BIT(cslice)) + if (gt->ccs.cslices & BIT(cslice)) /* * If available, assign the cslice * to the first available engine... diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h index def7dd0eb6f1..cfdd2ad5e954 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_types.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h @@ -207,6 +207,14 @@ struct intel_gt { [MAX_ENGINE_INSTANCE + 1]; enum intel_submission_method submission_method; + struct { + /* + * Mask of the non fused CCS slices + * to be used for the load balancing + */ + intel_engine_mask_t cslices; + } ccs; + /* * Default address space (either GGTT or ppGTT depending on arch). * -- cgit v1.2.3