From 9b3a8f558ddf8bd406b89698bc62cbaabe098b68 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Fri, 8 Jan 2021 20:40:26 +0000 Subject: [PATCH] drm/i915/gt: Disable arbitration on no-preempt requests If a request is submitted and known to require no preemption, disable arbitration around the batch which prevents the HW from handling a preemption request during the payload. Signed-off-by: Chris Wilson Cc: Mika Kuoppala Cc: Matthew Brost Cc: Lionel Landwerlin Reviewed-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20210108204026.20682-7-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +++--- drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 3 +++ 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index cf9a6b4eb913..b91b32195dcf 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -2534,6 +2534,9 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch) { int err; + if (intel_context_nopreempt(eb->context)) + __set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags); + err = eb_move_to_gpu(eb); if (err) return err; @@ -2574,9 +2577,6 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch) return err; } - if (intel_context_nopreempt(eb->context)) - __set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags); - return 0; } diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c index 1972dd5dca00..2e36e0a9d8a6 100644 --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c @@ -427,6 +427,9 @@ int gen8_emit_bb_start(struct i915_request *rq, { u32 *cs; + if (unlikely(i915_request_has_nopreempt(rq))) + return gen8_emit_bb_start_noarb(rq, offset, len, flags); + cs = intel_ring_begin(rq, 6); if (IS_ERR(cs)) return PTR_ERR(cs);