intel: Export madvise

Wrap the madvise ioctl for use in APPLE_object_purgeable.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>

libdrm/intel/intel_bufmgr.c

@@ -224,6 +224,13 @@ int drm_intel_bo_busy(drm_intel_bo *bo)
 	return 0;
 }
 
+int drm_intel_bo_madvise(drm_intel_bo *bo, int madv)
+{
+	if (bo->bufmgr->bo_madvise)
+		return bo->bufmgr->bo_madvise(bo, madv);
+	return -1;
+}
+
 int drm_intel_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo)
 {
 	return bo->bufmgr->bo_references(bo, target_bo);

libdrm/intel/intel_bufmgr.h

@@ -119,6 +119,7 @@ int drm_intel_bo_get_tiling(drm_intel_bo *bo, uint32_t * tiling_mode,
 			    uint32_t * swizzle_mode);
 int drm_intel_bo_flink(drm_intel_bo *bo, uint32_t * name);
 int drm_intel_bo_busy(drm_intel_bo *bo);
+int drm_intel_bo_madvise(drm_intel_bo *bo, int madv);
 
 int drm_intel_bo_disable_reuse(drm_intel_bo *bo);
 int drm_intel_bo_references(drm_intel_bo *bo, drm_intel_bo *target_bo);

libdrm/intel/intel_bufmgr_gem.c

@@ -398,8 +398,8 @@ drm_intel_gem_bo_busy(drm_intel_bo *bo)
 }
 
 static int
-drm_intel_gem_bo_madvise(drm_intel_bufmgr_gem *bufmgr_gem,
+drm_intel_gem_bo_madvise_internal(drm_intel_bufmgr_gem *bufmgr_gem,
-			 drm_intel_bo_gem *bo_gem, int state)
+				  drm_intel_bo_gem *bo_gem, int state)
 {
 	struct drm_i915_gem_madvise madv;
 
@@ -411,6 +411,15 @@ drm_intel_gem_bo_madvise(drm_intel_bufmgr_gem *bufmgr_gem,
 	return madv.retained;
 }
 
+static int
+drm_intel_gem_bo_madvise(drm_intel_bo *bo, int madv)
+{
+	return drm_intel_gem_bo_madvise_internal
+		((drm_intel_bufmgr_gem *) bo->bufmgr,
+		 (drm_intel_bo_gem *) bo,
+		 madv);
+}
+
 /* drop the oldest entries that have been purged by the kernel */
 static void
 drm_intel_gem_bo_cache_purge_bucket(drm_intel_bufmgr_gem *bufmgr_gem,
@@ -421,7 +430,7 @@ drm_intel_gem_bo_cache_purge_bucket(drm_intel_bufmgr_gem *bufmgr_gem,
 
 		bo_gem = DRMLISTENTRY(drm_intel_bo_gem,
 				      bucket->head.next, head);
-		if (drm_intel_gem_bo_madvise
+		if (drm_intel_gem_bo_madvise_internal
 		    (bufmgr_gem, bo_gem, I915_MADV_DONTNEED))
 			break;
 
@@ -493,7 +502,7 @@ retry:
 		}
 
 		if (alloc_from_cache) {
-			if (!drm_intel_gem_bo_madvise
+			if (!drm_intel_gem_bo_madvise_internal
 			    (bufmgr_gem, bo_gem, I915_MADV_WILLNEED)) {
 				drm_intel_gem_bo_free(&bo_gem->bo);
 				drm_intel_gem_bo_cache_purge_bucket(bufmgr_gem,
@@ -742,8 +751,8 @@ drm_intel_gem_bo_unreference_final(drm_intel_bo *bo, time_t time)
 
 		DRMLISTADDTAIL(&bo_gem->head, &bucket->head);
 
-		drm_intel_gem_bo_madvise(bufmgr_gem, bo_gem,
+		drm_intel_gem_bo_madvise_internal(bufmgr_gem, bo_gem,
-					 I915_MADV_DONTNEED);
+						  I915_MADV_DONTNEED);
 		drm_intel_gem_cleanup_bo_cache(bufmgr_gem, time);
 	} else {
 		drm_intel_gem_bo_free(bo);
@@ -1703,6 +1712,7 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
 	bufmgr_gem->bufmgr.bo_flink = drm_intel_gem_bo_flink;
 	bufmgr_gem->bufmgr.bo_exec = drm_intel_gem_bo_exec;
 	bufmgr_gem->bufmgr.bo_busy = drm_intel_gem_bo_busy;
+	bufmgr_gem->bufmgr.bo_madvise = drm_intel_gem_bo_madvise;
 	bufmgr_gem->bufmgr.destroy = drm_intel_bufmgr_gem_destroy;
 	bufmgr_gem->bufmgr.debug = 0;
 	bufmgr_gem->bufmgr.check_aperture_space =

libdrm/intel/intel_bufmgr_priv.h

@@ -216,6 +216,20 @@ struct _drm_intel_bufmgr {
 	 */
 	int (*bo_busy) (drm_intel_bo *bo);
 
+	/**
+	 * Specify the volatility of the buffer.
+	 * \param bo Buffer to create a name for
+	 * \param madv The purgeable status
+	 *
+	 * Use I915_MADV_DONTNEED to mark the buffer as purgeable, and it will be
+	 * reclaimed under memory pressure. If you subsequently require the buffer,
+	 * then you must pass I915_MADV_WILLNEED to mark the buffer as required.
+	 *
+	 * Returns 1 if the buffer was retained, or 0 if it was discarded whilst
+	 * marked as I915_MADV_DONTNEED.
+	 */
+	int (*bo_madvise) (drm_intel_bo *bo, int madv);
+
 	int (*check_aperture_space) (drm_intel_bo ** bo_array, int count);
 
 	/**