From: Chris Wilson Date: Wed, 13 Nov 2019 15:19:56 +0000 (+0000) Subject: drm/i915/gt: Invalidate as we write the gen7 breadcrumb X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9381e2bee8d2199501855a5d5f8dab016d6fb9e5;p=linux.git drm/i915/gt: Invalidate as we write the gen7 breadcrumb Still the saga of the hsw live_blt incoherency continues. While it did seem that the invalidate before the breadcrumb had improved the mtbf, nevertheless live_blt still failed. Mika's next idea was to pull the invalidate-stall into the breadcrumb write itself. References: 860afa086841 ("drm/i915/gt: Flush gen7 even harder") References: https://bugs.freedesktop.org/show_bug.cgi?id=112147 Testcase: igt/i915_selftest/live_blt Signed-off-by: Chris Wilson Cc: Mika Kuoppala Acked-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20191113151956.32242-1-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c index e8bee44add340..f25ceccb335e8 100644 --- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c @@ -454,12 +454,8 @@ static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs) GEM_BUG_ON(i915_request_active_timeline(rq)->hwsp_ggtt != rq->engine->status_page.vma); GEM_BUG_ON(offset_in_page(i915_request_active_timeline(rq)->hwsp_offset) != I915_GEM_HWS_SEQNO_ADDR); - *cs++ = (MI_FLUSH_DW | MI_INVALIDATE_TLB | - MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW); - *cs++ = I915_GEM_HWS_SCRATCH_ADDR | MI_FLUSH_DW_USE_GTT; - *cs++ = 0; - - *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX; + *cs++ = MI_FLUSH_DW | MI_INVALIDATE_TLB | + MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX; *cs++ = I915_GEM_HWS_SEQNO_ADDR | MI_FLUSH_DW_USE_GTT; *cs++ = rq->fence.seqno; @@ -474,6 +470,7 @@ static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs) *cs++ = 0; *cs++ = MI_USER_INTERRUPT; + *cs++ = MI_NOOP; rq->tail = intel_ring_offset(rq, cs); assert_ring_tail_valid(rq->ring, rq->tail);