minigbm_helpers.c - platform/external/minigbm - Gitiles

 /*
  * Copyright 2020 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 <ctype.h>
 #include <dirent.h>
 #include <drm/amdgpu_drm.h>
 #include <drm/radeon_drm.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>

 #include "minigbm_helpers.h"
 #include "util.h"

 /* These are set in stone. from drm_pciids.h */
 static unsigned int radeon_igp_ids[] = {
 	0x1304, 0x1305, 0x1306, 0x1307, 0x1309, 0x130A, 0x130B, 0x130C, 0x130D, 0x130E, 0x130F,
 	0x1310, 0x1311, 0x1312, 0x1313, 0x1315, 0x1316, 0x1317, 0x1318, 0x131B, 0x131C, 0x131D,
 	0x4136, 0x4137, 0x4237, 0x4336, 0x4337, 0x4437, 0x5834, 0x5835, 0x5954, 0x5955, 0x5974,
 	0x5975, 0x5a41, 0x5a42, 0x5a61, 0x5a62, 0x7834, 0x7835, 0x791e, 0x791f, 0x793f, 0x7941,
 	0x7942, 0x796c, 0x796d, 0x796e, 0x796f, 0x9610, 0x9611, 0x9612, 0x9613, 0x9614, 0x9615,
 	0x9616, 0x9640, 0x9641, 0x9642, 0x9643, 0x9644, 0x9645, 0x9647, 0x9648, 0x9649, 0x964a,
 	0x964b, 0x964c, 0x964e, 0x964f, 0x9710, 0x9711, 0x9712, 0x9713, 0x9714, 0x9715, 0x9802,
 	0x9803, 0x9804, 0x9805, 0x9806, 0x9807, 0x9808, 0x9809, 0x980A, 0x9830, 0x9831, 0x9832,
 	0x9833, 0x9834, 0x9835, 0x9836, 0x9837, 0x9838, 0x9839, 0x983a, 0x983b, 0x983c, 0x983d,
 	0x983e, 0x983f, 0x9850, 0x9851, 0x9852, 0x9853, 0x9854, 0x9855, 0x9856, 0x9857, 0x9858,
 	0x9859, 0x985A, 0x985B, 0x985C, 0x985D, 0x985E, 0x985F, 0x9900, 0x9901, 0x9903, 0x9904,
 	0x9905, 0x9906, 0x9907, 0x9908, 0x9909, 0x990A, 0x990B, 0x990C, 0x990D, 0x990E, 0x990F,
 	0x9910, 0x9913, 0x9917, 0x9918, 0x9919, 0x9990, 0x9991, 0x9992, 0x9993, 0x9994, 0x9995,
 	0x9996, 0x9997, 0x9998, 0x9999, 0x999A, 0x999B, 0x999C, 0x999D, 0x99A0, 0x99A2, 0x99A4
 };

 static int dri_node_num(const char *dri_node)
 {
 	long num;
 	ssize_t l = strlen(dri_node);

 	while (l > 0 && isdigit(dri_node[l - 1]))
 		l--;
 	num = strtol(dri_node + l, NULL, 10);
 	/* Normalize renderDX nodes with cardX nodes. */
 	if (num >= 128)
 		num -= 128;
 	return num;
 }

 static int fd_node_num(int fd)
 {
 	char fd_path[64];
 	char dri_node[256];
 	ssize_t dri_node_size;

 	snprintf(fd_path, sizeof(fd_path), "/proc/self/fd/%d", fd);

 	dri_node_size = readlink(fd_path, dri_node, sizeof(dri_node));
 	if (dri_node_size < 0)
 		return -1;
 	dri_node[dri_node_size] = '\0';
 	return dri_node_num(dri_node);
 }

 #if 0
 static int
 nouveau_getparam(int fd, uint64_t param, uint64_t *value)
 {
    struct drm_nouveau_getparam getparam = { .param = param, .value = 0 };
    int ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &getparam, sizeof(getparam));
    *value = getparam.value;
    return ret;
 }
 #endif

 /*
  * One would wish we could read .driver_features from DRM driver.
  */
 static int detect_device_info(unsigned int detect_flags, int fd, struct gbm_device_info *info)
 {
 	drmVersionPtr version;
 	drmModeResPtr resources;

 	info->dev_type_flags = 0;

 	version = drmGetVersion(fd);

 	if (!version)
 		return -EINVAL;

 	resources = drmModeGetResources(fd);
 	if (resources) {
 		info->connectors = (unsigned int)(resources->count_connectors);
 		if (resources->count_connectors)
 			info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY;
 		if (detect_flags & GBM_DETECT_FLAG_CONNECTED) {
 			int c;
 			for (c = 0; c < resources->count_connectors; c++) {
 				drmModeConnectorPtr conn =
 				    drmModeGetConnector(fd, resources->connectors[c]);
 				if (!conn)
 					continue;
 				if (conn->connection == DRM_MODE_CONNECTED)
 					info->connected++;
 				if (conn->connector_type == DRM_MODE_CONNECTOR_eDP ||
 				    conn->connector_type == DRM_MODE_CONNECTOR_LVDS ||
 				    conn->connector_type == DRM_MODE_CONNECTOR_DSI ||
 				    conn->connector_type == DRM_MODE_CONNECTOR_DPI)
 					info->dev_type_flags |= GBM_DEV_TYPE_FLAG_INTERNAL_LCD;
 				drmModeFreeConnector(conn);
 			}
 		}
 		drmModeFreeResources(resources);
 	}

 	if (strncmp("i915", version->name, version->name_len) == 0) {
 		/*
 		 * Detect Intel dGPU here when special getparam ioctl is added.
 		 */
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D;
 	} else if (strncmp("amdgpu", version->name, version->name_len) == 0) {
 		struct drm_amdgpu_info request = { 0 };
 		struct drm_amdgpu_info_device dev_info = { 0 };
 		int ret;

 		info->dev_type_flags = GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D;
 		request.return_pointer = (uintptr_t)&dev_info;
 		request.return_size = sizeof(dev_info);
 		request.query = AMDGPU_INFO_DEV_INFO;

 		ret =
 		    drmCommandWrite(fd, DRM_AMDGPU_INFO, &request, sizeof(struct drm_amdgpu_info));

 		if (ret != 0)
 			goto done;
 		if (!(dev_info.ids_flags & AMDGPU_IDS_FLAGS_FUSION))
 			info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISCRETE;

 	} else if (strncmp("radeon", version->name, version->name_len) == 0) {
 		struct drm_radeon_info radinfo = { 0, 0, 0 };
 		int ret;
 		uint32_t value = 0;
 		size_t d;

 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_DISCRETE;
 		radinfo.request = RADEON_INFO_DEVICE_ID;
 		radinfo.value = (uintptr_t)&value;
 		ret = drmCommandWriteRead(fd, DRM_RADEON_INFO, &radinfo,
 					  sizeof(struct drm_radeon_info));
 		if (ret != 0)
 			goto done;

 		for (d = 0; d < (sizeof(radeon_igp_ids) / sizeof(radeon_igp_ids[0])); d++) {
 			if (value == radeon_igp_ids[d]) {
 				info->dev_type_flags &= ~GBM_DEV_TYPE_FLAG_DISCRETE;
 				break;
 			}
 		}

 	} else if (strncmp("nvidia", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_DISCRETE;
 	} else if (strncmp("nouveau", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_DISCRETE;
 	} else if (strncmp("tegra", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("msm", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("armada", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("exynos", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("mediatek", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("rockchip", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("omapdrm", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("vc4", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("etnaviv", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("lima", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("panfrost", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("pvr", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("v3d", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_3D | GBM_DEV_TYPE_FLAG_ARMSOC;
 	} else if (strncmp("vgem", version->name, version->name_len) == 0) {
 		info->dev_type_flags |= GBM_DEV_TYPE_FLAG_BLOCKED;
 	} else if (strncmp("evdi", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_USB | GBM_DEV_TYPE_FLAG_BLOCKED;
 	} else if (strncmp("udl", version->name, version->name_len) == 0) {
 		info->dev_type_flags |=
 		    GBM_DEV_TYPE_FLAG_DISPLAY | GBM_DEV_TYPE_FLAG_USB | GBM_DEV_TYPE_FLAG_BLOCKED;
 	}

 done:
 	drmFreeVersion(version);
 	return 0;
 }

 PUBLIC int gbm_get_default_device_fd(void)
 {
 	DIR *dir;
 	int ret, fd, dfd = -1;
 	char *rendernode_name;
 	struct dirent *dir_ent;
 	struct gbm_device_info info;

 	dir = opendir("/dev/dri");
 	if (!dir)
 		return -1;

 	fd = -1;
 	while ((dir_ent = readdir(dir))) {
 		if (dir_ent->d_type != DT_CHR)
 			continue;

 		if (strncmp(dir_ent->d_name, "renderD", 7))
 			continue;

 		ret = asprintf(&rendernode_name, "/dev/dri/%s", dir_ent->d_name);
 		if (ret < 0)
 			continue;

 		fd = open(rendernode_name, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
 		free(rendernode_name);

 		if (fd < 0)
 			continue;

 		memset(&info, 0, sizeof(info));
 		if (detect_device_info(0, fd, &info) < 0) {
 			close(fd);
 			fd = -1;
 			continue;
 		}

 		if (info.dev_type_flags & GBM_DEV_TYPE_FLAG_BLOCKED) {
 			close(fd);
 			fd = -1;
 			continue;
 		}

 		if (!(info.dev_type_flags & GBM_DEV_TYPE_FLAG_DISPLAY)) {
 			close(fd);
 			fd = -1;
 			continue;
 		}

 		if (info.dev_type_flags & GBM_DEV_TYPE_FLAG_DISCRETE) {
 			if (dfd < 0)
 				dfd = fd;
 			else
 				close(fd);
 			fd = -1;
 		} else {
 			if (dfd >= 0) {
 				close(dfd);
 				dfd = -1;
 			}
 			break;
 		}
 	}
 	if (dfd >= 0)
 		return dfd;

 	return fd;
 }

 PUBLIC int gbm_detect_device_info(unsigned int detect_flags, int fd, struct gbm_device_info *info)
 {
 	if (!info)
 		return -EINVAL;
 	memset(info, 0, sizeof(*info));
 	info->dri_node_num = fd_node_num(fd);
 	return detect_device_info(detect_flags, fd, info);
 }

 PUBLIC int gbm_detect_device_info_path(unsigned int detect_flags, const char *dev_node,
 				       struct gbm_device_info *info)
 {
 	char rendernode_name[64];
 	int fd;
 	int ret;

 	if (!info)
 		return -EINVAL;
 	memset(info, 0, sizeof(*info));
 	info->dri_node_num = dri_node_num(dev_node);

 	snprintf(rendernode_name, sizeof(rendernode_name), "/dev/dri/renderD%d",
 		 info->dri_node_num + 128);
 	fd = open(rendernode_name, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
 	if (fd < 0)
 		return -1;
 	ret = detect_device_info(detect_flags, fd, info);
 	close(fd);
 	return ret;
 }
	/*
	* Copyright 2020 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 <ctype.h>
	#include <dirent.h>
	#include <drm/amdgpu_drm.h>
	#include <drm/radeon_drm.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <stddef.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <xf86drm.h>
	#include <xf86drmMode.h>

	#include "minigbm_helpers.h"
	#include "util.h"

	/* These are set in stone. from drm_pciids.h */
	static unsigned int radeon_igp_ids[] = {
	0x1304, 0x1305, 0x1306, 0x1307, 0x1309, 0x130A, 0x130B, 0x130C, 0x130D, 0x130E, 0x130F,
	0x1310, 0x1311, 0x1312, 0x1313, 0x1315, 0x1316, 0x1317, 0x1318, 0x131B, 0x131C, 0x131D,
	0x4136, 0x4137, 0x4237, 0x4336, 0x4337, 0x4437, 0x5834, 0x5835, 0x5954, 0x5955, 0x5974,
	0x5975, 0x5a41, 0x5a42, 0x5a61, 0x5a62, 0x7834, 0x7835, 0x791e, 0x791f, 0x793f, 0x7941,
	0x7942, 0x796c, 0x796d, 0x796e, 0x796f, 0x9610, 0x9611, 0x9612, 0x9613, 0x9614, 0x9615,
	0x9616, 0x9640, 0x9641, 0x9642, 0x9643, 0x9644, 0x9645, 0x9647, 0x9648, 0x9649, 0x964a,
	0x964b, 0x964c, 0x964e, 0x964f, 0x9710, 0x9711, 0x9712, 0x9713, 0x9714, 0x9715, 0x9802,
	0x9803, 0x9804, 0x9805, 0x9806, 0x9807, 0x9808, 0x9809, 0x980A, 0x9830, 0x9831, 0x9832,
	0x9833, 0x9834, 0x9835, 0x9836, 0x9837, 0x9838, 0x9839, 0x983a, 0x983b, 0x983c, 0x983d,
	0x983e, 0x983f, 0x9850, 0x9851, 0x9852, 0x9853, 0x9854, 0x9855, 0x9856, 0x9857, 0x9858,
	0x9859, 0x985A, 0x985B, 0x985C, 0x985D, 0x985E, 0x985F, 0x9900, 0x9901, 0x9903, 0x9904,
	0x9905, 0x9906, 0x9907, 0x9908, 0x9909, 0x990A, 0x990B, 0x990C, 0x990D, 0x990E, 0x990F,
	0x9910, 0x9913, 0x9917, 0x9918, 0x9919, 0x9990, 0x9991, 0x9992, 0x9993, 0x9994, 0x9995,
	0x9996, 0x9997, 0x9998, 0x9999, 0x999A, 0x999B, 0x999C, 0x999D, 0x99A0, 0x99A2, 0x99A4
	};

	static int dri_node_num(const char *dri_node)
	{
	long num;
	ssize_t l = strlen(dri_node);

	while (l > 0 && isdigit(dri_node[l - 1]))
	l--;
	num = strtol(dri_node + l, NULL, 10);
	/* Normalize renderDX nodes with cardX nodes. */
	if (num >= 128)
	num -= 128;
	return num;
	}

	static int fd_node_num(int fd)
	{
	char fd_path[64];
	char dri_node[256];
	ssize_t dri_node_size;

	snprintf(fd_path, sizeof(fd_path), "/proc/self/fd/%d", fd);

	dri_node_size = readlink(fd_path, dri_node, sizeof(dri_node));
	if (dri_node_size < 0)
	return -1;
	dri_node[dri_node_size] = '\0';
	return dri_node_num(dri_node);
	}

	#if 0
	static int
	nouveau_getparam(int fd, uint64_t param, uint64_t *value)
	{
	struct drm_nouveau_getparam getparam = { .param = param, .value = 0 };
	int ret = drmCommandWriteRead(fd, DRM_NOUVEAU_GETPARAM, &getparam, sizeof(getparam));
	*value = getparam.value;
	return ret;
	}
	#endif

	/*
	* One would wish we could read .driver_features from DRM driver.
	*/
	static int detect_device_info(unsigned int detect_flags, int fd, struct gbm_device_info *info)
	{
	drmVersionPtr version;
	drmModeResPtr resources;

	info->dev_type_flags = 0;

	version = drmGetVersion(fd);

	if (!version)
	return -EINVAL;

	resources = drmModeGetResources(fd);
	if (resources) {
	info->connectors = (unsigned int)(resources->count_connectors);
	if (resources->count_connectors)
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY;
	if (detect_flags & GBM_DETECT_FLAG_CONNECTED) {
	int c;
	for (c = 0; c < resources->count_connectors; c++) {
	drmModeConnectorPtr conn =
	drmModeGetConnector(fd, resources->connectors[c]);
	if (!conn)
	continue;
	if (conn->connection == DRM_MODE_CONNECTED)
	info->connected++;
	if (conn->connector_type == DRM_MODE_CONNECTOR_eDP \|\|
	conn->connector_type == DRM_MODE_CONNECTOR_LVDS \|\|
	conn->connector_type == DRM_MODE_CONNECTOR_DSI \|\|
	conn->connector_type == DRM_MODE_CONNECTOR_DPI)
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_INTERNAL_LCD;
	drmModeFreeConnector(conn);
	}
	}
	drmModeFreeResources(resources);
	}

	if (strncmp("i915", version->name, version->name_len) == 0) {
	/*
	* Detect Intel dGPU here when special getparam ioctl is added.
	*/
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D;
	} else if (strncmp("amdgpu", version->name, version->name_len) == 0) {
	struct drm_amdgpu_info request = { 0 };
	struct drm_amdgpu_info_device dev_info = { 0 };
	int ret;

	info->dev_type_flags = GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D;
	request.return_pointer = (uintptr_t)&dev_info;
	request.return_size = sizeof(dev_info);
	request.query = AMDGPU_INFO_DEV_INFO;

	ret =
	drmCommandWrite(fd, DRM_AMDGPU_INFO, &request, sizeof(struct drm_amdgpu_info));

	if (ret != 0)
	goto done;
	if (!(dev_info.ids_flags & AMDGPU_IDS_FLAGS_FUSION))
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISCRETE;

	} else if (strncmp("radeon", version->name, version->name_len) == 0) {
	struct drm_radeon_info radinfo = { 0, 0, 0 };
	int ret;
	uint32_t value = 0;
	size_t d;

	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_DISCRETE;
	radinfo.request = RADEON_INFO_DEVICE_ID;
	radinfo.value = (uintptr_t)&value;
	ret = drmCommandWriteRead(fd, DRM_RADEON_INFO, &radinfo,
	sizeof(struct drm_radeon_info));
	if (ret != 0)
	goto done;

	for (d = 0; d < (sizeof(radeon_igp_ids) / sizeof(radeon_igp_ids[0])); d++) {
	if (value == radeon_igp_ids[d]) {
	info->dev_type_flags &= ~GBM_DEV_TYPE_FLAG_DISCRETE;
	break;
	}
	}

	} else if (strncmp("nvidia", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_DISCRETE;
	} else if (strncmp("nouveau", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_DISCRETE;
	} else if (strncmp("tegra", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("msm", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("armada", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("exynos", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("mediatek", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("rockchip", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("omapdrm", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("vc4", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("etnaviv", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("lima", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("panfrost", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("pvr", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("v3d", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_3D \| GBM_DEV_TYPE_FLAG_ARMSOC;
	} else if (strncmp("vgem", version->name, version->name_len) == 0) {
	info->dev_type_flags \|= GBM_DEV_TYPE_FLAG_BLOCKED;
	} else if (strncmp("evdi", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_USB \| GBM_DEV_TYPE_FLAG_BLOCKED;
	} else if (strncmp("udl", version->name, version->name_len) == 0) {
	info->dev_type_flags \|=
	GBM_DEV_TYPE_FLAG_DISPLAY \| GBM_DEV_TYPE_FLAG_USB \| GBM_DEV_TYPE_FLAG_BLOCKED;
	}

	done:
	drmFreeVersion(version);
	return 0;
	}

	PUBLIC int gbm_get_default_device_fd(void)
	{
	DIR *dir;
	int ret, fd, dfd = -1;
	char *rendernode_name;
	struct dirent *dir_ent;
	struct gbm_device_info info;

	dir = opendir("/dev/dri");
	if (!dir)
	return -1;

	fd = -1;
	while ((dir_ent = readdir(dir))) {
	if (dir_ent->d_type != DT_CHR)
	continue;

	if (strncmp(dir_ent->d_name, "renderD", 7))
	continue;

	ret = asprintf(&rendernode_name, "/dev/dri/%s", dir_ent->d_name);
	if (ret < 0)
	continue;

	fd = open(rendernode_name, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	free(rendernode_name);

	if (fd < 0)
	continue;

	memset(&info, 0, sizeof(info));
	if (detect_device_info(0, fd, &info) < 0) {
	close(fd);
	fd = -1;
	continue;
	}

	if (info.dev_type_flags & GBM_DEV_TYPE_FLAG_BLOCKED) {
	close(fd);
	fd = -1;
	continue;
	}

	if (!(info.dev_type_flags & GBM_DEV_TYPE_FLAG_DISPLAY)) {
	close(fd);
	fd = -1;
	continue;
	}

	if (info.dev_type_flags & GBM_DEV_TYPE_FLAG_DISCRETE) {
	if (dfd < 0)
	dfd = fd;
	else
	close(fd);
	fd = -1;
	} else {
	if (dfd >= 0) {
	close(dfd);
	dfd = -1;
	}
	break;
	}
	}
	if (dfd >= 0)
	return dfd;

	return fd;
	}

	PUBLIC int gbm_detect_device_info(unsigned int detect_flags, int fd, struct gbm_device_info *info)
	{
	if (!info)
	return -EINVAL;
	memset(info, 0, sizeof(*info));
	info->dri_node_num = fd_node_num(fd);
	return detect_device_info(detect_flags, fd, info);
	}

	PUBLIC int gbm_detect_device_info_path(unsigned int detect_flags, const char *dev_node,
	struct gbm_device_info *info)
	{
	char rendernode_name[64];
	int fd;
	int ret;

	if (!info)
	return -EINVAL;
	memset(info, 0, sizeof(*info));
	info->dri_node_num = dri_node_num(dev_node);

	snprintf(rendernode_name, sizeof(rendernode_name), "/dev/dri/renderD%d",
	info->dri_node_num + 128);
	fd = open(rendernode_name, O_RDWR \| O_CLOEXEC \| O_NOCTTY \| O_NONBLOCK);
	if (fd < 0)
	return -1;
	ret = detect_device_info(detect_flags, fd, info);
	close(fd);
	return ret;
	}