[Mesa-dev] [PATCH 6/7] i965: Reported supported context priorities to EGL/DRI

[Chris Wilson]

Hook up the RendererQuery for __DRI2_RENDERER_HAS_CONTEXT_PRIORITY to
report the available DRM_I915_GEM_CONTEXT_SETPARAM options based on the
the default context. The kernel will validate the request to change the
property, so we get an accurate reflection of available support (based on
kernel version and privilege) and we should only have to do it once
during screen setup -- although the SETPARAM should be fast, they are
still an ioctl each.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Emil Velikov <emil.velikov at collabora.com>
---
 src/mesa/drivers/dri/i965/intel_screen.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index 22d9f19298..112935a580 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1373,6 +1373,19 @@ brw_query_renderer_integer(__DRIscreen *dri_screen,
    case __DRI2_RENDERER_HAS_TEXTURE_3D:
       value[0] = 1;
       return 0;
+   case __DRI2_RENDERER_HAS_CONTEXT_PRIORITY:
+      value[0] = 0;
+      if (brw_hw_context_set_priority(screen->bufmgr,
+				      0, BRW_CONTEXT_HIGH_PRIORITY) == 0)
+         value[0] |= __DRI2_RENDERER_HAS_CONTEXT_PRIORITY_HIGH;
+      if (brw_hw_context_set_priority(screen->bufmgr,
+				      0, BRW_CONTEXT_LOW_PRIORITY) == 0)
+         value[0] |= __DRI2_RENDERER_HAS_CONTEXT_PRIORITY_LOW;
+      /* reset to default last, just in case */
+      if (brw_hw_context_set_priority(screen->bufmgr,
+				      0, BRW_CONTEXT_MEDIUM_PRIORITY) == 0)
+         value[0] |= __DRI2_RENDERER_HAS_CONTEXT_PRIORITY_MEDIUM;
+      return 0;
    default:
       return driQueryRendererIntegerCommon(dri_screen, param, value);
    }
-- 
2.14.2