drm_hwcomposer: Support Nvidia gralloc

When using an Nvidia gralloc implementation, ask Nvidia gralloc to import the
buffer_handle_t to the hwcomposer's drm device.

Arguably, the code to perform the import would more naturally belong to
drm_hwcomposer than Nvidia gralloc.  But letting Nvidia gralloc do it has two
advantages.  First, drm_hwcomposer doesn't need to include vendor headers or
link against vendor libraries.  This means that it's easy to support both
drm_gralloc and Nvidia gralloc from the same default build of drm_hwcomposer.
Second, Nvidia gralloc will take care of properly setting up any vendor
specific metadata (such as tiling parameters) of the imported GEM handle.

Change-Id: I0f77fb301e7e0bff2a8cd7befeae4bc4892220ad
Reviewed-on: https://chrome-internal-review.googlesource.com/195115
Reviewed-by: Stéphane Marchesin <marcheu@google.com>
Commit-Queue: Stéphane Marchesin <marcheu@google.com>
Tested-by: Stéphane Marchesin <marcheu@google.com>

Android.mk

@@ -17,7 +17,7 @@ LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 
 # TODO: We should specify this in device.mk
-BUFFER_IMPORTER := gralloc
+BUFFER_IMPORTER := nvidia-gralloc
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \
@@ -40,10 +40,14 @@ LOCAL_C_INCLUDES := \
 LOCAL_CFLAGS :=
 LOCAL_SRC_FILES := hwcomposer.cpp
 
-ifeq ($(strip $(BUFFER_IMPORTER)),gralloc)
+ifeq ($(strip $(BUFFER_IMPORTER)),drm-gralloc)
 LOCAL_C_INCLUDES += external/drm_gralloc
 LOCAL_SRC_FILES += hwcomposer_import_drm_gralloc.cpp
 endif
+ifeq ($(strip $(BUFFER_IMPORTER)),nvidia-gralloc)
+LOCAL_C_INCLUDES += external/drm_gralloc
+LOCAL_SRC_FILES += hwcomposer_import_nv_gralloc.cpp
+endif
 
 LOCAL_MODULE := hwcomposer.drm
 LOCAL_MODULE_TAGS := optional

drm_hwcomposer.h

@@ -16,6 +16,10 @@
 
 struct hwc_import_context;
 
+enum {
+       GRALLOC_MODULE_PERFORM_DRM_IMPORT = 0xffeeff00
+};
+
 struct hwc_drm_bo {
 	uint32_t width;
 	uint32_t height;

hwcomposer_import_nv_gralloc.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2015 NVIDIA Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include <cutils/log.h>
+#include <hardware/gralloc.h>
+
+#include "drm_hwcomposer.h"
+
+struct hwc_import_context {
+	const gralloc_module_t *gralloc_module;
+};
+
+int hwc_import_init(struct hwc_import_context **ctx)
+{
+	int ret;
+	struct hwc_import_context *import_ctx;
+
+	import_ctx = (struct hwc_import_context *)calloc(1,
+				sizeof(*import_ctx));
+	if (!ctx) {
+		ALOGE("Failed to allocate gralloc import context");
+		return -ENOMEM;
+	}
+
+	ret = hw_get_module(GRALLOC_HARDWARE_MODULE_ID,
+			(const hw_module_t **)&import_ctx->gralloc_module);
+	if (ret) {
+		ALOGE("Failed to open gralloc module");
+		goto err;
+	}
+
+	if (!strcasecmp(import_ctx->gralloc_module->common.author, "NVIDIA"))
+		ALOGW("Using non-NVIDIA gralloc module: %s\n",
+			import_ctx->gralloc_module->common.name);
+
+	*ctx = import_ctx;
+
+	return 0;
+
+err:
+	free(import_ctx);
+	return ret;
+}
+
+int hwc_import_destroy(struct hwc_import_context *ctx)
+{
+	free(ctx);
+	return 0;
+}
+
+int hwc_create_bo_from_import(int fd, hwc_import_context *ctx,
+			      buffer_handle_t handle, struct hwc_drm_bo *bo)
+{
+	const gralloc_module_t *g = ctx->gralloc_module;
+
+	bo->importer_fd = -1;
+	return g->perform(g, GRALLOC_MODULE_PERFORM_DRM_IMPORT, fd, handle, bo);
+}