drm/i915: Automatic i915_switch_context for legacy
During request construction, after pinning the context we know whether
or not we have to emit a context switch. So move this common operation
from every caller into i915_gem_request_alloc() itself.
v2: Always submit the request if we emitted some commands during request
construction, as typically it also involves changes in global state.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171120102002.22254-2-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 91eae1b..86e2346 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -624,6 +624,10 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
if (ret)
goto err_unpin;
+ ret = intel_ring_wait_for_space(ring, MIN_SPACE_FOR_ADD_REQUEST);
+ if (ret)
+ goto err_unreserve;
+
/* Move the oldest request to the slab-cache (if not in use!) */
req = list_first_entry_or_null(&engine->timeline->requests,
typeof(*req), link);