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drm/i915/gt: Do not generate the command streamer for all the CCS

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commit ea315f98e5 upstream.

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 commit c7a5aa4e57)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andi Shyti 2024-03-28 08:34:04 +01:00 committed by Greg Kroah-Hartman
parent c1f7ce2a11
commit 726ff62386
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/i915/gt/intel_engine_cs.c
View file

@ -912,6 +912,23 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt)
info->engine_mask &= ~BIT(GSC0);
}
/*
* Do not create the command streamer for CCS slices beyond the first.
* All the workload submitted to the first engine will be shared among
* all the slices.
*
* Once the user will be allowed to customize the CCS mode, then this
* check needs to be removed.
*/
if (IS_DG2(gt->i915)) {
u8 first_ccs = __ffs(CCS_MASK(gt));
/* Mask off all the CCS engine */
info->engine_mask &= ~GENMASK(CCS3, CCS0);
/* Put back in the first CCS engine */
info->engine_mask |= BIT(_CCS(first_ccs));
}
return info->engine_mask;
}