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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 <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210108204026.20682-7-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2021-01-08 20:40:26 +00:00
parent 751f82b353
commit 9b3a8f558d
2 changed files with 6 additions and 3 deletions
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6
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -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;
}

3
drivers/gpu/drm/i915/gt/gen8_engine_cs.c
View File

@ -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);