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drm/i915/gt: Avoid using tag 0 for the very first submission

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Assume that the HW starts off with tag 0 "active" and so avoid using tag
0 for our own first ELSP submission.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191229183153.3719869-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-12-29 18:31:48 +00:00
parent 987281ab02
commit 7b02b23e5d
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -1108,7 +1108,7 @@ __execlists_schedule_in(struct i915_request *rq)
/* We don't need a strict matching tag, just different values */
ce->lrc_desc &= ~GENMASK_ULL(47, 37);
ce->lrc_desc |=
(u64)(engine->context_tag++ % NUM_CONTEXT_TAG) <<
(u64)(++engine->context_tag % NUM_CONTEXT_TAG) <<
GEN11_SW_CTX_ID_SHIFT;
BUILD_BUG_ON(NUM_CONTEXT_TAG > GEN12_MAX_CONTEXT_HW_ID);
}
@ -2925,6 +2925,8 @@ static void enable_execlists(struct intel_engine_cs *engine)
RING_HWS_PGA,
i915_ggtt_offset(engine->status_page.vma));
ENGINE_POSTING_READ(engine, RING_HWS_PGA);
engine->context_tag = 0;
}
static bool unexpected_starting_state(struct intel_engine_cs *engine)