[Mesa-dev] [PATCH v2 4/4] 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 valid the request to change
context, 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>
---
 src/mesa/drivers/dri/i965/intel_screen.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index 96e7a39863..cb0fb21193 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1007,6 +1007,16 @@ 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, 1) == 0)
+         value[0] |= __DRI2_RENDERER_HAS_CONTEXT_PRIORITY_HIGH;
+      if (brw_hw_context_set_priority(screen->bufmgr, 0, -1) == 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, 0) == 0)
+         value[0] |= __DRI2_RENDERER_HAS_CONTEXT_PRIORITY_MEDIUM;
+      return 0;
    default:
       return driQueryRendererIntegerCommon(dri_screen, param, value);
    }
-- 
2.11.0