X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=drv.c;h=d5484482102c59edeca088d56abd42ca4d86a7b8;hb=3381588d35f78e1c1d3f3fac3927f3cde9462e66;hp=cd8a9d5e3504caac7e125623dda8756a5ccaccba;hpb=ef920536083c3e6959daa6a98db01b0f653c1c83;p=android-x86%2Fexternal-minigbm.git

diff --git a/drv.c b/drv.c
index cd8a9d5..d548448 100644
--- a/drv.c
+++ b/drv.c
@@ -1,9 +1,10 @@
 /*
- * Copyright (c) 2016 The Chromium OS Authors. All rights reserved.
+ * Copyright 2016 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include <assert.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <stdint.h>
@@ -11,37 +12,54 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
+#include <sys/types.h>
+#include <unistd.h>
 #include <xf86drm.h>
 
 #include "drv_priv.h"
 #include "helpers.h"
 #include "util.h"
 
-extern struct backend backend_cirrus;
-extern struct backend backend_evdi;
+#ifdef DRV_AMDGPU
+extern const struct backend backend_amdgpu;
+#endif
+extern const struct backend backend_evdi;
 #ifdef DRV_EXYNOS
-extern struct backend backend_exynos;
+extern const struct backend backend_exynos;
 #endif
-extern struct backend backend_gma500;
 #ifdef DRV_I915
-extern struct backend backend_i915;
+extern const struct backend backend_i915;
 #endif
 #ifdef DRV_MARVELL
-extern struct backend backend_marvell;
+extern const struct backend backend_marvell;
 #endif
 #ifdef DRV_MEDIATEK
-extern struct backend backend_mediatek;
+extern const struct backend backend_mediatek;
+#endif
+#ifdef DRV_MESON
+extern const struct backend backend_meson;
+#endif
+#ifdef DRV_MSM
+extern const struct backend backend_msm;
+#endif
+extern const struct backend backend_nouveau;
+#ifdef DRV_RADEON
+extern const struct backend backend_radeon;
 #endif
 #ifdef DRV_ROCKCHIP
-extern struct backend backend_rockchip;
+extern const struct backend backend_rockchip;
 #endif
 #ifdef DRV_TEGRA
-extern struct backend backend_tegra;
+extern const struct backend backend_tegra;
+#endif
+extern const struct backend backend_udl;
+#ifdef DRV_VC4
+extern const struct backend backend_vc4;
 #endif
-extern struct backend backend_udl;
-extern struct backend backend_virtio_gpu;
+extern const struct backend backend_vgem;
+extern const struct backend backend_virtio_gpu;
 
-static struct backend *drv_get_backend(int fd)
+static const struct backend *drv_get_backend(int fd)
 {
 	drmVersionPtr drm_version;
 	unsigned int i;
@@ -51,13 +69,14 @@ static struct backend *drv_get_backend(int fd)
 	if (!drm_version)
 		return NULL;
 
-	struct backend *backend_list[] = {
-		&backend_cirrus,
+	const struct backend *backend_list[] = {
+#ifdef DRV_AMDGPU
+		&backend_amdgpu,
+#endif
 		&backend_evdi,
 #ifdef DRV_EXYNOS
 		&backend_exynos,
 #endif
-		&backend_gma500,
 #ifdef DRV_I915
 		&backend_i915,
 #endif
@@ -67,6 +86,16 @@ static struct backend *drv_get_backend(int fd)
 #ifdef DRV_MEDIATEK
 		&backend_mediatek,
 #endif
+#ifdef DRV_MESON
+		&backend_meson,
+#endif
+#ifdef DRV_MSM
+		&backend_msm,
+#endif
+		&backend_nouveau,
+#ifdef DRV_RADEON
+		&backend_radeon,
+#endif
 #ifdef DRV_ROCKCHIP
 		&backend_rockchip,
 #endif
@@ -74,10 +103,13 @@ static struct backend *drv_get_backend(int fd)
 		&backend_tegra,
 #endif
 		&backend_udl,
-		&backend_virtio_gpu,
+#ifdef DRV_VC4
+		&backend_vc4,
+#endif
+		&backend_vgem,     &backend_virtio_gpu,
 	};
 
-	for(i = 0; i < ARRAY_SIZE(backend_list); i++)
+	for (i = 0; i < ARRAY_SIZE(backend_list); i++)
 		if (!strcmp(drm_version->name, backend_list[i]->name)) {
 			drmFreeVersion(drm_version);
 			return backend_list[i];
@@ -92,7 +124,7 @@ struct driver *drv_create(int fd)
 	struct driver *drv;
 	int ret;
 
-	drv = (struct driver *) calloc(1, sizeof(*drv));
+	drv = (struct driver *)calloc(1, sizeof(*drv));
 
 	if (!drv)
 		return NULL;
@@ -100,40 +132,58 @@ struct driver *drv_create(int fd)
 	drv->fd = fd;
 	drv->backend = drv_get_backend(fd);
 
-	if (!drv->backend) {
-		free(drv);
-		return NULL;
-	}
+	if (!drv->backend)
+		goto free_driver;
 
-	if (pthread_mutex_init(&drv->table_lock, NULL)) {
-		free(drv);
-		return NULL;
-	}
+	if (pthread_mutex_init(&drv->driver_lock, NULL))
+		goto free_driver;
 
 	drv->buffer_table = drmHashCreate();
-	if (!drv->buffer_table) {
-		free(drv);
-		return NULL;
-	}
+	if (!drv->buffer_table)
+		goto free_lock;
+
+	drv->mappings = drv_array_init(sizeof(struct mapping));
+	if (!drv->mappings)
+		goto free_buffer_table;
+
+	drv->combos = drv_array_init(sizeof(struct combination));
+	if (!drv->combos)
+		goto free_mappings;
 
 	if (drv->backend->init) {
 		ret = drv->backend->init(drv);
 		if (ret) {
-			free(drv);
-			return NULL;
+			drv_array_destroy(drv->combos);
+			goto free_mappings;
 		}
 	}
 
 	return drv;
+
+free_mappings:
+	drv_array_destroy(drv->mappings);
+free_buffer_table:
+	drmHashDestroy(drv->buffer_table);
+free_lock:
+	pthread_mutex_destroy(&drv->driver_lock);
+free_driver:
+	free(drv);
+	return NULL;
 }
 
 void drv_destroy(struct driver *drv)
 {
+	pthread_mutex_lock(&drv->driver_lock);
+
 	if (drv->backend->close)
 		drv->backend->close(drv);
 
-	pthread_mutex_destroy(&drv->table_lock);
 	drmHashDestroy(drv->buffer_table);
+	drv_array_destroy(drv->mappings);
+	drv_array_destroy(drv->combos);
+
+	pthread_mutex_unlock(&drv->driver_lock);
+	pthread_mutex_destroy(&drv->driver_lock);
 
 	free(drv);
 }
@@ -143,39 +193,36 @@ int drv_get_fd(struct driver *drv)
 	return drv->fd;
 }
 
-const char *
-drv_get_name(struct driver *drv)
+const char *drv_get_name(struct driver *drv)
 {
 	return drv->backend->name;
 }
 
-int drv_is_format_supported(struct driver *drv, drv_format_t format,
-			    uint64_t usage)
+struct combination *drv_get_combination(struct driver *drv, uint32_t format, uint64_t use_flags)
 {
-	unsigned int i;
+	struct combination *curr, *best;
 
-	if (format == DRV_FORMAT_NONE || usage == DRV_BO_USE_NONE)
+	if (format == DRM_FORMAT_NONE || use_flags == BO_USE_NONE)
 		return 0;
 
-	for (i = 0 ; i < ARRAY_SIZE(drv->backend->format_list); i++)
-	{
-		if (!drv->backend->format_list[i].format)
-			break;
-
-		if (drv->backend->format_list[i].format == format &&
-		      (drv->backend->format_list[i].usage & usage) == usage)
-			return 1;
+	best = NULL;
+	uint32_t i;
+	for (i = 0; i < drv_array_size(drv->combos); i++) {
+		curr = drv_array_at_idx(drv->combos, i);
+		if ((format == curr->format) && use_flags == (curr->use_flags & use_flags))
+			if (!best || best->metadata.priority < curr->metadata.priority)
+				best = curr;
 	}
 
-	return 0;
+	return best;
 }
 
-struct bo *drv_bo_new(struct driver *drv, uint32_t width, uint32_t height,
-		      drv_format_t format)
+struct bo *drv_bo_new(struct driver *drv, uint32_t width, uint32_t height, uint32_t format,
+		      uint64_t use_flags)
 {
 
 	struct bo *bo;
-	bo = (struct bo *) calloc(1, sizeof(*bo));
+	bo = (struct bo *)calloc(1, sizeof(*bo));
 
 	if (!bo)
 		return NULL;
@@ -184,6 +231,7 @@ struct bo *drv_bo_new(struct driver *drv, uint32_t width, uint32_t height,
 	bo->width = width;
 	bo->height = height;
 	bo->format = format;
+	bo->use_flags = use_flags;
 	bo->num_planes = drv_num_planes_from_format(format);
 
 	if (!bo->num_planes) {
@@ -194,31 +242,73 @@ struct bo *drv_bo_new(struct driver *drv, uint32_t width, uint32_t height,
 	return bo;
 }
 
-struct bo *drv_bo_create(struct driver *drv, uint32_t width, uint32_t height,
-			 drv_format_t format, uint64_t flags)
+struct bo *drv_bo_create(struct driver *drv, uint32_t width, uint32_t height, uint32_t format,
+			 uint64_t use_flags)
 {
 	int ret;
 	size_t plane;
 	struct bo *bo;
 
-	bo = drv_bo_new(drv, width, height, format);
+	bo = drv_bo_new(drv, width, height, format, use_flags);
 
 	if (!bo)
 		return NULL;
 
-	ret = drv->backend->bo_create(bo, width, height, format, flags);
+	ret = drv->backend->bo_create(bo, width, height, format, use_flags);
 
 	if (ret) {
 		free(bo);
 		return NULL;
 	}
 
-	pthread_mutex_lock(&drv->table_lock);
+	pthread_mutex_lock(&drv->driver_lock);
+
+	for (plane = 0; plane < bo->num_planes; plane++) {
+		if (plane > 0)
+			assert(bo->offsets[plane] >= bo->offsets[plane - 1]);
+
+		drv_increment_reference_count(drv, bo, plane);
+	}
+
+	pthread_mutex_unlock(&drv->driver_lock);
+
+	return bo;
+}
+
+struct bo *drv_bo_create_with_modifiers(struct driver *drv, uint32_t width, uint32_t height,
+					uint32_t format, const uint64_t *modifiers, uint32_t count)
+{
+	int ret;
+	size_t plane;
+	struct bo *bo;
+
+	if (!drv->backend->bo_create_with_modifiers) {
+		errno = ENOENT;
+		return NULL;
+	}
+
+	bo = drv_bo_new(drv, width, height, format, BO_USE_NONE);
+
+	if (!bo)
+		return NULL;
+
+	ret = drv->backend->bo_create_with_modifiers(bo, width, height, format, modifiers, count);
+
+	if (ret) {
+		free(bo);
+		return NULL;
+	}
+
+	pthread_mutex_lock(&drv->driver_lock);
+
+	for (plane = 0; plane < bo->num_planes; plane++) {
+		if (plane > 0)
+			assert(bo->offsets[plane] >= bo->offsets[plane - 1]);
 
-	for (plane = 0; plane < bo->num_planes; plane++)
 		drv_increment_reference_count(drv, bo, plane);
+	}
 
-	pthread_mutex_unlock(&drv->table_lock);
+	pthread_mutex_unlock(&drv->driver_lock);
 
 	return bo;
 }
@@ -229,7 +319,7 @@ void drv_bo_destroy(struct bo *bo)
 	uintptr_t total = 0;
 	struct driver *drv = bo->drv;
 
-	pthread_mutex_lock(&drv->table_lock);
+	pthread_mutex_lock(&drv->driver_lock);
 
 	for (plane = 0; plane < bo->num_planes; plane++)
 		drv_decrement_reference_count(drv, bo, plane);
@@ -237,75 +327,195 @@ void drv_bo_destroy(struct bo *bo)
 	for (plane = 0; plane < bo->num_planes; plane++)
 		total += drv_get_reference_count(drv, bo, plane);
 
-	pthread_mutex_unlock(&drv->table_lock);
+	pthread_mutex_unlock(&drv->driver_lock);
 
-	if (total == 0)
+	if (total == 0) {
+		assert(drv_mapping_destroy(bo) == 0);
 		bo->drv->backend->bo_destroy(bo);
+	}
 
 	free(bo);
 }
 
-void *
-drv_bo_map(struct bo *bo)
+struct bo *drv_bo_import(struct driver *drv, struct drv_import_fd_data *data)
 {
-	assert(drv_num_buffers_per_bo(bo) == 1);
+	int ret;
+	size_t plane;
+	struct bo *bo;
+	off_t seek_end;
+
+	bo = drv_bo_new(drv, data->width, data->height, data->format, data->use_flags);
 
-	if (!bo->map_data || bo->map_data == MAP_FAILED)
-		bo->map_data = bo->drv->backend->bo_map(bo);
+	if (!bo)
+		return NULL;
 
-	return bo->map_data;
+	ret = drv->backend->bo_import(bo, data);
+	if (ret) {
+		free(bo);
+		return NULL;
+	}
+
+	for (plane = 0; plane < bo->num_planes; plane++) {
+		bo->strides[plane] = data->strides[plane];
+		bo->offsets[plane] = data->offsets[plane];
+		bo->format_modifiers[plane] = data->format_modifiers[plane];
+
+		seek_end = lseek(data->fds[plane], 0, SEEK_END);
+		if (seek_end == (off_t)(-1)) {
+			fprintf(stderr, "drv: lseek() failed with %s\n", strerror(errno));
+			goto destroy_bo;
+		}
+
+		lseek(data->fds[plane], 0, SEEK_SET);
+		if (plane == bo->num_planes - 1 || data->offsets[plane + 1] == 0)
+			bo->sizes[plane] = seek_end - data->offsets[plane];
+		else
+			bo->sizes[plane] = data->offsets[plane + 1] - data->offsets[plane];
+
+		if ((int64_t)bo->offsets[plane] + bo->sizes[plane] > seek_end) {
+			fprintf(stderr, "drv: buffer size is too large.\n");
+			goto destroy_bo;
+		}
+
+		bo->total_size += bo->sizes[plane];
+	}
+
+	return bo;
+
+destroy_bo:
+	drv_bo_destroy(bo);
+	return NULL;
 }
 
-int
-drv_bo_unmap(struct bo *bo)
+void *drv_bo_map(struct bo *bo, const struct rectangle *rect, uint32_t map_flags,
+		 struct mapping **map_data, size_t plane)
 {
-	int ret = -1;
+	uint32_t i;
+	uint8_t *addr;
+	struct mapping mapping;
+
+	assert(rect->width >= 0);
+	assert(rect->height >= 0);
+	assert(rect->x + rect->width <= drv_bo_get_width(bo));
+	assert(rect->y + rect->height <= drv_bo_get_height(bo));
+	assert(BO_MAP_READ_WRITE & map_flags);
+	/* No CPU access for protected buffers. */
+	assert(!(bo->use_flags & BO_USE_PROTECTED));
+
+	memset(&mapping, 0, sizeof(mapping));
+	mapping.rect = *rect;
+	mapping.refcount = 1;
+
+	pthread_mutex_lock(&bo->drv->driver_lock);
+
+	for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
+		struct mapping *prior = (struct mapping *)drv_array_at_idx(bo->drv->mappings, i);
+		if (prior->vma->handle != bo->handles[plane].u32 ||
+		    prior->vma->map_flags != map_flags)
+			continue;
+
+		if (rect->x != prior->rect.x || rect->y != prior->rect.y ||
+		    rect->width != prior->rect.width || rect->height != prior->rect.height)
+			continue;
+
+		prior->refcount++;
+		*map_data = prior;
+		goto exact_match;
+	}
 
-	assert(drv_num_buffers_per_bo(bo) == 1);
+	for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
+		struct mapping *prior = (struct mapping *)drv_array_at_idx(bo->drv->mappings, i);
+		if (prior->vma->handle != bo->handles[plane].u32 ||
+		    prior->vma->map_flags != map_flags)
+			continue;
 
-	if (bo->map_data && bo->map_data != MAP_FAILED)
-		ret = munmap(bo->map_data, bo->sizes[0]);
+		prior->vma->refcount++;
+		mapping.vma = prior->vma;
+		goto success;
+	}
 
-	bo->map_data = NULL;
+	mapping.vma = calloc(1, sizeof(*mapping.vma));
+	addr = bo->drv->backend->bo_map(bo, mapping.vma, plane, map_flags);
+	if (addr == MAP_FAILED) {
+		*map_data = NULL;
+		free(mapping.vma);
+		pthread_mutex_unlock(&bo->drv->driver_lock);
+		return MAP_FAILED;
+	}
 
-	return ret;
+	mapping.vma->refcount = 1;
+	mapping.vma->addr = addr;
+	mapping.vma->handle = bo->handles[plane].u32;
+	mapping.vma->map_flags = map_flags;
+
+success:
+	*map_data = drv_array_append(bo->drv->mappings, &mapping);
+exact_match:
+	drv_bo_invalidate(bo, *map_data);
+	addr = (uint8_t *)((*map_data)->vma->addr);
+	addr += drv_bo_get_plane_offset(bo, plane);
+	pthread_mutex_unlock(&bo->drv->driver_lock);
+	return (void *)addr;
 }
 
-struct bo *drv_bo_import(struct driver *drv, struct drv_import_fd_data *data)
+int drv_bo_unmap(struct bo *bo, struct mapping *mapping)
 {
-	int ret;
-	struct bo *bo;
-	struct drm_prime_handle prime_handle;
+	uint32_t i;
+	int ret = drv_bo_flush(bo, mapping);
+	if (ret)
+		return ret;
 
-	memset(&prime_handle, 0, sizeof(prime_handle));
-	prime_handle.fd = data->fd;
-
-	/* This function can support only single plane formats. */
-	/* If multi-plane import is desired, new function should be added. */
-	if (drv_num_planes_from_format(data->format) != 1)
-		return NULL;
+	pthread_mutex_lock(&bo->drv->driver_lock);
 
-	bo = drv_bo_new(drv, data->width, data->height, data->format);
+	if (--mapping->refcount)
+		goto out;
 
-	ret = drmIoctl(drv->fd, DRM_IOCTL_PRIME_FD_TO_HANDLE,
-		       &prime_handle);
+	if (!--mapping->vma->refcount) {
+		ret = bo->drv->backend->bo_unmap(bo, mapping->vma);
+		free(mapping->vma);
+	}
 
-	if (ret) {
-		fprintf(stderr, "drv: DRM_IOCTL_PRIME_FD_TO_HANDLE failed "
-				"(fd=%u)\n", prime_handle.fd);
-		free(bo);
-		return NULL;
+	for (i = 0; i < drv_array_size(bo->drv->mappings); i++) {
+		if (mapping == (struct mapping *)drv_array_at_idx(bo->drv->mappings, i)) {
+			drv_array_remove(bo->drv->mappings, i);
+			break;
+		}
 	}
 
-	bo->strides[0] = data->stride;
-	bo->sizes[0] = data->height * data->stride;
-	bo->handles[0].u32 = prime_handle.handle;
+out:
+	pthread_mutex_unlock(&bo->drv->driver_lock);
+	return ret;
+}
 
-	pthread_mutex_lock(&drv->table_lock);
-	drv_increment_reference_count(drv, bo, 0);
-	pthread_mutex_unlock(&drv->table_lock);
+int drv_bo_invalidate(struct bo *bo, struct mapping *mapping)
+{
+	int ret = 0;
 
-	return bo;
+	assert(mapping);
+	assert(mapping->vma);
+	assert(mapping->refcount > 0);
+	assert(mapping->vma->refcount > 0);
+
+	if (bo->drv->backend->bo_invalidate)
+		ret = bo->drv->backend->bo_invalidate(bo, mapping);
+
+	return ret;
+}
+
+int drv_bo_flush(struct bo *bo, struct mapping *mapping)
+{
+	int ret = 0;
+
+	assert(mapping);
+	assert(mapping->vma);
+	assert(mapping->refcount > 0);
+	assert(mapping->vma->refcount > 0);
+	assert(!(bo->use_flags & BO_USE_PROTECTED));
+
+	if (bo->drv->backend->bo_flush)
+		ret = bo->drv->backend->bo_flush(bo, mapping);
+
+	return ret;
 }
 
 uint32_t drv_bo_get_width(struct bo *bo)
@@ -343,11 +553,9 @@ int drv_bo_get_plane_fd(struct bo *bo, size_t plane)
 	int ret, fd;
 	assert(plane < bo->num_planes);
 
-	ret = drmPrimeHandleToFD(bo->drv->fd, bo->handles[plane].u32,
-				 DRM_CLOEXEC | DRM_RDWR, &fd);
+	ret = drmPrimeHandleToFD(bo->drv->fd, bo->handles[plane].u32, DRM_CLOEXEC | DRM_RDWR, &fd);
 
 	return (ret) ? ret : fd;
-
 }
 
 uint32_t drv_bo_get_plane_offset(struct bo *bo, size_t plane)
@@ -370,6 +578,98 @@ uint32_t drv_bo_get_plane_stride(struct bo *bo, size_t plane)
 
 uint64_t drv_bo_get_plane_format_modifier(struct bo *bo, size_t plane)
 {
-        assert(plane < bo->num_planes);
+	assert(plane < bo->num_planes);
 	return bo->format_modifiers[plane];
 }
+
+uint32_t drv_bo_get_format(struct bo *bo)
+{
+	return bo->format;
+}
+
+uint32_t drv_resolve_format(struct driver *drv, uint32_t format, uint64_t use_flags)
+{
+	if (drv->backend->resolve_format)
+		return drv->backend->resolve_format(format, use_flags);
+
+	return format;
+}
+
+size_t drv_num_planes_from_format(uint32_t format)
+{
+	switch (format) {
+	case DRM_FORMAT_ABGR1555:
+	case DRM_FORMAT_ABGR2101010:
+	case DRM_FORMAT_ABGR4444:
+	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_ARGB1555:
+	case DRM_FORMAT_ARGB2101010:
+	case DRM_FORMAT_ARGB4444:
+	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_AYUV:
+	case DRM_FORMAT_BGR233:
+	case DRM_FORMAT_BGR565:
+	case DRM_FORMAT_BGR888:
+	case DRM_FORMAT_BGRA1010102:
+	case DRM_FORMAT_BGRA4444:
+	case DRM_FORMAT_BGRA5551:
+	case DRM_FORMAT_BGRA8888:
+	case DRM_FORMAT_BGRX1010102:
+	case DRM_FORMAT_BGRX4444:
+	case DRM_FORMAT_BGRX5551:
+	case DRM_FORMAT_BGRX8888:
+	case DRM_FORMAT_C8:
+	case DRM_FORMAT_GR88:
+	case DRM_FORMAT_R8:
+	case DRM_FORMAT_RG88:
+	case DRM_FORMAT_RGB332:
+	case DRM_FORMAT_RGB565:
+	case DRM_FORMAT_RGB888:
+	case DRM_FORMAT_RGBA1010102:
+	case DRM_FORMAT_RGBA4444:
+	case DRM_FORMAT_RGBA5551:
+	case DRM_FORMAT_RGBA8888:
+	case DRM_FORMAT_RGBX1010102:
+	case DRM_FORMAT_RGBX4444:
+	case DRM_FORMAT_RGBX5551:
+	case DRM_FORMAT_RGBX8888:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
+	case DRM_FORMAT_XBGR1555:
+	case DRM_FORMAT_XBGR2101010:
+	case DRM_FORMAT_XBGR4444:
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_XRGB1555:
+	case DRM_FORMAT_XRGB2101010:
+	case DRM_FORMAT_XRGB4444:
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+		return 1;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV21:
+		return 2;
+	case DRM_FORMAT_YVU420:
+	case DRM_FORMAT_YVU420_ANDROID:
+		return 3;
+	}
+
+	fprintf(stderr, "drv: UNKNOWN FORMAT %d\n", format);
+	return 0;
+}
+
+uint32_t drv_num_buffers_per_bo(struct bo *bo)
+{
+	uint32_t count = 0;
+	size_t plane, p;
+
+	for (plane = 0; plane < bo->num_planes; plane++) {
+		for (p = 0; p < plane; p++)
+			if (bo->handles[p].u32 == bo->handles[plane].u32)
+				break;
+		if (p == plane)
+			count++;
+	}
+
+	return count;
+}