cros_gralloc: Use property to select custom backends

property name: vendor.gralloc.minigbm.backend
possible values:
1. auto (default)
2. gbm_mesa
3. dmaheaps

Change-Id: I5ab2649f98d40d139afb008ea8a804c790b81c31
Signed-off-by: Roman Stratiienko <[email protected]>

For reviews, comments, suggestions and questions visit:
#10

Author: rsglobal

cros_gralloc/cros_gralloc_driver.cc

@@ -91,7 +91,6 @@ std::shared_ptr<cros_gralloc_driver> cros_gralloc_driver::get_instance()
 	return s_instance;
 }
 
-#ifndef DRV_EXTERNAL
 static struct driver *init_try_node(int idx, char const *str)
 {
 	int fd;
@@ -132,6 +131,27 @@ static struct driver *init_try_nodes()
 	uint32_t min_card_node = DRM_CARD_NODE_START;
 	uint32_t max_card_node = (min_card_node + num_nodes);
 
+	char lib_name[PROPERTY_VALUE_MAX];
+	property_get("vendor.gralloc.minigbm.backend", lib_name, "auto");
+
+	if (strcmp(lib_name, "dmaheaps") == 0) {
+		ALOGI("Initializing dma-buf heaps backend");
+		drv = drv_create(DRV_DMAHEAPS_DRIVER);
+		if (drv)
+			return drv;
+
+		ALOGE("Failed to initialize dma-buf heap backend.");
+	}
+
+	if (strcmp(lib_name, "gbm_mesa") == 0) {
+		ALOGI("Initializing gbm_mesa backend");
+		drv = drv_create(DRV_GBM_MESA_DRIVER);
+		if (drv)
+			return drv;
+
+		ALOGE("Failed to initialize gbm_mesa backend.");
+	}
+
 	// Try render nodes...
 	for (uint32_t i = min_render_node; i < max_render_node; i++) {
 		drv = init_try_node(i, render_nodes_fmt);
@@ -146,18 +166,19 @@ static struct driver *init_try_nodes()
 			return drv;
 	}
 
-	return nullptr;
-}
+	/* Fallback to gbm_mesa which is a way smarter than dumb_driver */
+	if (strcmp(lib_name, "gbm_mesa") != 0) {
+		ALOGI("Falling-back to gbm_mesa backend");
+		drv = drv_create(DRV_GBM_MESA_DRIVER);
+		if (drv)
+			return drv;
+	}
 
-#else
+	ALOGE("Failed for find suitable backend");
 
-static struct driver *init_try_nodes()
-{
-	return drv_create(-1);
+	return nullptr;
 }
 
-#endif
-
 static void drv_destroy_and_close(struct driver *drv)
 {
 	int fd = drv_get_fd(drv);

drv.c

@@ -27,15 +27,12 @@
 #include "drv_priv.h"
 #include "util.h"
 
-#ifdef DRV_EXTERNAL
-extern struct backend *init_external_backend();
-
-static const struct backend *drv_get_backend(int fd)
-{
-	return init_external_backend();
-}
-#else
-
+#ifdef DRV_DMABUF_HEAP
+extern const struct backend backend_dmabuf_heap;
+#endif
+#ifdef DRV_GBM_MESA
+extern const struct backend backend_gbm_mesa;
+#endif
 #ifdef DRV_AMDGPU
 extern const struct backend backend_amdgpu;
 #endif
@@ -118,7 +115,6 @@ static const struct backend *drv_get_backend(int fd)
 	drmFreeVersion(drm_version);
 	return NULL;
 }
-#endif
 
 struct driver *drv_create(int fd)
 {
@@ -134,8 +130,20 @@ struct driver *drv_create(int fd)
 	minigbm_debug = drv_get_os_option(MINIGBM_DEBUG);
 	drv->compression = (minigbm_debug == NULL) || (strcmp(minigbm_debug, "nocompression") != 0);
 
-	drv->fd = fd;
-	drv->backend = drv_get_backend(fd);
+#ifdef DRV_GBM_MESA
+	if (fd == DRV_GBM_MESA_DRIVER) {
+		drv->backend = &backend_gbm_mesa;
+	} else
+#endif
+#ifdef DRV_DMABUF_HEAP
+	    if (fd == DRV_DMAHEAPS_DRIVER) {
+		drv->backend = &backend_dmabuf_heap;
+	} else
+#endif
+	{
+		drv->fd = fd;
+		drv->backend = drv_get_backend(fd);
+	}
 
 	if (!drv->backend)
 		goto free_driver;

drv.h

@@ -16,6 +16,9 @@ extern "C" {
 #include <stdint.h>
 #include <stdlib.h>
 
+#define DRV_GBM_MESA_DRIVER (-2)
+#define DRV_DMAHEAPS_DRIVER (-3)
+
 #define DRV_MAX_PLANES 4
 
 // clang-format off