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drm/i915/gt: Do not generate the command streamer for all the CCS
We want a fixed load CCS balancing consisting in all slices sharing one single user engine. For this reason do not create the intel_engine_cs structure with its dedicated command streamer for CCS slices beyond the first. Fixes:d2eae8e98d
("drm/i915/dg2: Drop force_probe requirement") Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Cc: Chris Wilson <chris.p.wilson@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: <stable@vger.kernel.org> # v6.2+ Acked-by: Michal Mrozek <michal.mrozek@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240328073409.674098-3-andi.shyti@linux.intel.com (cherry picked from commitc7a5aa4e57
) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
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@ -908,6 +908,23 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt)
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info->engine_mask &= ~BIT(GSC0);
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}
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/*
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* Do not create the command streamer for CCS slices beyond the first.
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* All the workload submitted to the first engine will be shared among
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* all the slices.
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*
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* Once the user will be allowed to customize the CCS mode, then this
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* check needs to be removed.
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*/
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if (IS_DG2(gt->i915)) {
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u8 first_ccs = __ffs(CCS_MASK(gt));
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/* Mask off all the CCS engine */
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info->engine_mask &= ~GENMASK(CCS3, CCS0);
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/* Put back in the first CCS engine */
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info->engine_mask |= BIT(_CCS(first_ccs));
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}
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return info->engine_mask;
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}
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