Mesa (master): i965: Report supported context priorities to EGL/DRI

[Chris Wilson]

Module: Mesa
Branch: master
Commit: f72392231b227f2d08d1dc73cb590f41ffc32492
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f72392231b227f2d08d1dc73cb590f41ffc32492

Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Apr 11 16:17:36 2017 +0100

i965: Report supported context priorities to EGL/DRI

Hook up the RendererQuery for __DRI2_RENDERER_HAS_CONTEXT_PRIORITY to
report the available DRM_I915_GEM_CONTEXT_SETPARAM options based on the
per-client 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>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 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 28e83cf9b2..5975b91a76 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1371,6 +1371,19 @@ 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);
    }