On Fri, Jul 18, 2014 at 01:39:29AM -0700, Rodrigo Vivi wrote:
> semaphore _sync_seqno, _seqno and _mbox are smaller than number of rings.
> This optimization is to remove the ring itself from the list and the logic to
> do that
> is at intel_ring_sync_index as below:
>
> /*
> * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
> * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
> * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
> * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
> * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
> */
>
> v2: Skip when from == to (Damien).
>
> Cc: Damien Lespiau <damien.lesp...@intel.com>
> Cc: Ben Widawsky <benjamin.widaw...@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_gpu_error.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c
> b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 9faebbc..6608bee 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -764,7 +764,7 @@ static void gen8_record_semaphore_state(struct
> drm_i915_private *dev_priv,
> struct intel_engine_cs *ring,
> struct drm_i915_error_ring *ering)
> {
> - struct intel_engine_cs *useless;
> + struct intel_engine_cs *to;
> int i;
>
> if (!i915_semaphore_is_enabled(dev_priv->dev))
> @@ -776,13 +776,17 @@ static void gen8_record_semaphore_state(struct
> drm_i915_private *dev_priv,
> dev_priv->semaphore_obj,
> &dev_priv->gtt.base);
>
> - for_each_ring(useless, dev_priv, i) {
> + for_each_ring(to, dev_priv, i) {
> u16 signal_offset =
> (GEN8_SIGNAL_OFFSET(ring, i) & PAGE_MASK) / 4;
> u32 *tmp = error->semaphore_obj->pages[0];
> + int idx = intel_ring_sync_index(ring, to);
>
> - ering->semaphore_mboxes[i] = tmp[signal_offset];
> - ering->semaphore_seqno[i] = ring->semaphore.sync_seqno[i];
> + if (ring->id == to->id)
> + return;
continue; ? you need to skip "ring", but you also need to fill the array
when to->id > ring->id.
I guess you should also be able to short-circuit the iteration sooner as
well, no need to do the computations. I believe if "(ring == to)" would
work as well.
--
Damien
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