drm/i915/guc: Reorder __i915_guc_submit to reduce spinlock holdtime

A couple of operations, the flushes and the tracepoint, do not require
serialisation by client->wq_lock, so move them before we take it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170228112803.11646-3-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index d6a6cf2..7b535a3 100644 (file)
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -517,18 +517,18 @@ static void __i915_guc_submit(struct drm_i915_gem_request *rq)
        struct i915_guc_client *client = guc->execbuf_client;
        int b_ret;
 
-       /* We are always called with irqs disabled */
-       GEM_BUG_ON(!irqs_disabled());
-
-       spin_lock(&client->wq_lock);
-       guc_wq_item_append(client, rq);
-
        /* WA to flush out the pending GMADR writes to ring buffer. */
        if (i915_vma_is_map_and_fenceable(rq->ring->vma))
                POSTING_READ_FW(GUC_STATUS);
 
        trace_i915_gem_request_in(rq, 0);
 
+       /* We are always called with irqs disabled */
+       GEM_BUG_ON(!irqs_disabled());
+
+       spin_lock(&client->wq_lock);
+
+       guc_wq_item_append(client, rq);
        b_ret = guc_ring_doorbell(client);
 
        client->submissions[engine_id] += 1;
@@ -538,6 +538,7 @@ static void __i915_guc_submit(struct drm_i915_gem_request *rq)
 
        guc->submissions[engine_id] += 1;
        guc->last_seqno[engine_id] = rq->global_seqno;
+
        spin_unlock(&client->wq_lock);
 }