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author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-02 22:50:39 +0100 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-02 22:58:32 +0100 |
commit | ddf07be7a2aeb80aa159a7eeade01b7b5e1e3e43 (patch) | |
tree | 1c9d8e202c79ca516e9c2ac31c7fe1d465d1eabf /drivers/gpu/drm/i915/intel_ringbuffer.c | |
parent | 5b043f4e60ff72d1a0348871e33c176e4005ae9b (diff) | |
download | op-kernel-dev-ddf07be7a2aeb80aa159a7eeade01b7b5e1e3e43.zip op-kernel-dev-ddf07be7a2aeb80aa159a7eeade01b7b5e1e3e43.tar.gz |
drm/i915: Simplify calling engine->sync_to
Since requests can no longer be generated as a side-effect of
intel_ring_begin(), we know that the seqno will be unchanged during
ring-emission. This predicatablity then means we do not have to check
for the seqno wrapping around whilst emitting the semaphore for
engine->sync_to().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-31-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-22-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 64 |
1 files changed, 23 insertions, 41 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 0b6f12c..51f3123 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1496,12 +1496,6 @@ static int gen8_render_emit_request(struct drm_i915_gem_request *req) return 0; } -static inline bool i915_gem_has_seqno_wrapped(struct drm_i915_private *dev_priv, - u32 seqno) -{ - return dev_priv->last_seqno < seqno; -} - /** * intel_ring_sync - sync the waiter to the signaller on seqno * @@ -1511,24 +1505,23 @@ static inline bool i915_gem_has_seqno_wrapped(struct drm_i915_private *dev_priv, */ static int -gen8_ring_sync(struct drm_i915_gem_request *waiter_req, - struct intel_engine_cs *signaller, - u32 seqno) +gen8_ring_sync(struct drm_i915_gem_request *wait, + struct drm_i915_gem_request *signal) { - struct intel_ring *waiter = waiter_req->ring; - struct drm_i915_private *dev_priv = waiter_req->i915; - u64 offset = GEN8_WAIT_OFFSET(waiter_req->engine, signaller->id); + struct intel_ring *waiter = wait->ring; + struct drm_i915_private *dev_priv = wait->i915; + u64 offset = GEN8_WAIT_OFFSET(wait->engine, signal->engine->id); struct i915_hw_ppgtt *ppgtt; int ret; - ret = intel_ring_begin(waiter_req, 4); + ret = intel_ring_begin(wait, 4); if (ret) return ret; intel_ring_emit(waiter, MI_SEMAPHORE_WAIT | MI_SEMAPHORE_GLOBAL_GTT | MI_SEMAPHORE_SAD_GTE_SDD); - intel_ring_emit(waiter, seqno); + intel_ring_emit(waiter, signal->fence.seqno); intel_ring_emit(waiter, lower_32_bits(offset)); intel_ring_emit(waiter, upper_32_bits(offset)); intel_ring_advance(waiter); @@ -1538,48 +1531,37 @@ gen8_ring_sync(struct drm_i915_gem_request *waiter_req, * We do this on the i915_switch_context() following the wait and * before the dispatch. */ - ppgtt = waiter_req->ctx->ppgtt; - if (ppgtt && waiter_req->engine->id != RCS) - ppgtt->pd_dirty_rings |= intel_engine_flag(waiter_req->engine); + ppgtt = wait->ctx->ppgtt; + if (ppgtt && wait->engine->id != RCS) + ppgtt->pd_dirty_rings |= intel_engine_flag(wait->engine); return 0; } static int -gen6_ring_sync(struct drm_i915_gem_request *waiter_req, - struct intel_engine_cs *signaller, - u32 seqno) +gen6_ring_sync(struct drm_i915_gem_request *wait, + struct drm_i915_gem_request *signal) { - struct intel_ring *waiter = waiter_req->ring; + struct intel_ring *waiter = wait->ring; u32 dw1 = MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER; - u32 wait_mbox = signaller->semaphore.mbox.wait[waiter_req->engine->id]; + u32 wait_mbox = signal->engine->semaphore.mbox.wait[wait->engine->id]; int ret; - /* Throughout all of the GEM code, seqno passed implies our current - * seqno is >= the last seqno executed. However for hardware the - * comparison is strictly greater than. - */ - seqno -= 1; - WARN_ON(wait_mbox == MI_SEMAPHORE_SYNC_INVALID); - ret = intel_ring_begin(waiter_req, 4); + ret = intel_ring_begin(wait, 4); if (ret) return ret; - /* If seqno wrap happened, omit the wait with no-ops */ - if (likely(!i915_gem_has_seqno_wrapped(waiter_req->i915, seqno))) { - intel_ring_emit(waiter, dw1 | wait_mbox); - intel_ring_emit(waiter, seqno); - intel_ring_emit(waiter, 0); - intel_ring_emit(waiter, MI_NOOP); - } else { - intel_ring_emit(waiter, MI_NOOP); - intel_ring_emit(waiter, MI_NOOP); - intel_ring_emit(waiter, MI_NOOP); - intel_ring_emit(waiter, MI_NOOP); - } + intel_ring_emit(waiter, dw1 | wait_mbox); + /* Throughout all of the GEM code, seqno passed implies our current + * seqno is >= the last seqno executed. However for hardware the + * comparison is strictly greater than. + */ + intel_ring_emit(waiter, signal->fence.seqno - 1); + intel_ring_emit(waiter, 0); + intel_ring_emit(waiter, MI_NOOP); intel_ring_advance(waiter); return 0; |