[PATCH] drm/i915: Add cached bo create interface

[Zhenyu Wang <zhenyuw@linux.intel.com>]

Some BO is required to have cached attribute in GTT, e.g PIPE_CONTROL
store DW buffer used for occlusion query function. This one adds new
flags for that within bo create ioctl.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c |    3 +++
 drivers/gpu/drm/i915/i915_gem.c |    4 ++++
 include/drm/i915_drm.h          |    5 ++++-
 3 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index e9fb895..df5a248 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -778,6 +778,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
 	case I915_PARAM_HAS_COHERENT_RINGS:
 		value = 1;
 		break;
+	case I915_PARAM_HAS_CREATE_CACHED:
+		value = 1;
+		break;
 	default:
 		DRM_DEBUG_DRIVER("Unknown parameter %d\n",
 				 param->param);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 27fa2a1..8bc5d05 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -216,6 +216,10 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
 		return ret;
 	}
 
+	/* Setup required CPU cached bit for bo, e.g query obj */
+	if (args->flags == DRM_I915_GEM_CREATE_CACHED)
+		obj->agp_type = AGP_USER_CACHED_MEMORY;
+
 	/* drop reference from allocate - handle holds it now */
 	drm_gem_object_unreference(&obj->base);
 	trace_i915_gem_object_create(obj);
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index a2776e2..b34db99 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -289,6 +289,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_BLT		 11
 #define I915_PARAM_HAS_RELAXED_FENCING	 12
 #define I915_PARAM_HAS_COHERENT_RINGS	 13
+#define I915_PARAM_HAS_CREATE_CACHED	 14
 
 typedef struct drm_i915_getparam {
 	int param;
@@ -370,6 +371,8 @@ struct drm_i915_gem_init {
 	__u64 gtt_end;
 };
 
+#define DRM_I915_GEM_CREATE_CACHED	1
+
 struct drm_i915_gem_create {
 	/**
 	 * Requested size for the object.
@@ -383,7 +386,7 @@ struct drm_i915_gem_create {
 	 * Object handles are nonzero.
 	 */
 	__u32 handle;
-	__u32 pad;
+	__u32 flags;
 };
 
 struct drm_i915_gem_pread {
-- 
1.7.1