gralloc_drm_pipe.c - platform/external/drm_gralloc - Git at Google

 /*
  * Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
  * Copyright (C) 2010-2011 LunarG Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included
  * in all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */

 #define LOG_TAG "GRALLOC-PIPE"

 #include <cutils/log.h>
 #include <errno.h>

 #include <pipe/p_screen.h>
 #include <pipe/p_context.h>
 #include <state_tracker/drm_driver.h>
 #include <util/u_inlines.h>
 #include <util/u_memory.h>

 #include "gralloc_drm.h"
 #include "gralloc_drm_priv.h"

 struct pipe_manager {
 	struct gralloc_drm_drv_t base;

 	int fd;
 	char driver[16];
 	pthread_mutex_t mutex;
 	struct pipe_screen *screen;
 	struct pipe_context *context;
 };

 struct pipe_buffer {
 	struct gralloc_drm_bo_t base;

 	struct pipe_resource *resource;
 	struct winsys_handle winsys;

 	struct pipe_transfer *transfer;
 };

 static enum pipe_format get_pipe_format(int format)
 {
 	enum pipe_format fmt;

 	switch (format) {
 	case HAL_PIXEL_FORMAT_RGBA_8888:
 		fmt = PIPE_FORMAT_R8G8B8A8_UNORM;
 		break;
 	case HAL_PIXEL_FORMAT_RGBX_8888:
 		fmt = PIPE_FORMAT_R8G8B8X8_UNORM;
 		break;
 	case HAL_PIXEL_FORMAT_RGB_888:
 		fmt = PIPE_FORMAT_R8G8B8_UNORM;
 		break;
 	case HAL_PIXEL_FORMAT_RGB_565:
 		fmt = PIPE_FORMAT_B5G6R5_UNORM;
 		break;
 	case HAL_PIXEL_FORMAT_BGRA_8888:
 		fmt = PIPE_FORMAT_B8G8R8A8_UNORM;
 		break;
 	case HAL_PIXEL_FORMAT_YV12:
 	case HAL_PIXEL_FORMAT_DRM_NV12:
 	case HAL_PIXEL_FORMAT_YCbCr_422_SP:
 	case HAL_PIXEL_FORMAT_YCrCb_420_SP:
 	default:
 		fmt = PIPE_FORMAT_NONE;
 		break;
 	}

 	return fmt;
 }

 static unsigned get_pipe_bind(int usage)
 {
 	unsigned bind = PIPE_BIND_SHARED;

 	if (usage & GRALLOC_USAGE_SW_READ_MASK)
 		bind |= PIPE_BIND_TRANSFER_READ;
 	if (usage & GRALLOC_USAGE_SW_WRITE_MASK)
 		bind |= PIPE_BIND_TRANSFER_WRITE;

 	if (usage & GRALLOC_USAGE_HW_TEXTURE)
 		bind |= PIPE_BIND_SAMPLER_VIEW;
 	if (usage & GRALLOC_USAGE_HW_RENDER)
 		bind |= PIPE_BIND_RENDER_TARGET;
 	if (usage & GRALLOC_USAGE_HW_FB) {
 		bind |= PIPE_BIND_RENDER_TARGET;
 		bind |= PIPE_BIND_SCANOUT;
 	}

 	return bind;
 }

 static struct pipe_buffer *get_pipe_buffer_locked(struct pipe_manager *pm,
 		const struct gralloc_drm_handle_t *handle)
 {
 	struct pipe_buffer *buf;
 	struct pipe_resource templ;

 	memset(&templ, 0, sizeof(templ));
 	templ.format = get_pipe_format(handle->format);
 	templ.bind = get_pipe_bind(handle->usage);
 	templ.target = PIPE_TEXTURE_2D;

 	if (templ.format == PIPE_FORMAT_NONE ||
 	    !pm->screen->is_format_supported(pm->screen, templ.format,
 				templ.target, 0, templ.bind)) {
 		ALOGE("unsupported format 0x%x", handle->format);
 		return NULL;
 	}

 	buf = CALLOC(1, sizeof(*buf));
 	if (!buf) {
 		ALOGE("failed to allocate pipe buffer");
 		return NULL;
 	}

 	templ.width0 = handle->width;
 	templ.height0 = handle->height;
 	templ.depth0 = 1;
 	templ.array_size = 1;

 	if (handle->name) {
 		buf->winsys.type = DRM_API_HANDLE_TYPE_SHARED;
 		buf->winsys.handle = handle->name;
 		buf->winsys.stride = handle->stride;

 		buf->resource = pm->screen->resource_from_handle(pm->screen,
 				&templ, &buf->winsys);
 		if (!buf->resource)
 			goto fail;
 	}
 	else {
 		buf->resource =
 			pm->screen->resource_create(pm->screen, &templ);
 		if (!buf->resource)
 			goto fail;

 		buf->winsys.type = DRM_API_HANDLE_TYPE_SHARED;
 		if (!pm->screen->resource_get_handle(pm->screen,
 					buf->resource, &buf->winsys))
 			goto fail;
 	}

 	/* need the gem handle for fb */
 	if (handle->usage & GRALLOC_USAGE_HW_FB) {
 		struct winsys_handle tmp;

 		memset(&tmp, 0, sizeof(tmp));
 		tmp.type = DRM_API_HANDLE_TYPE_KMS;
 		if (!pm->screen->resource_get_handle(pm->screen,
 					buf->resource, &tmp))
 			goto fail;

 		buf->base.fb_handle = tmp.handle;
 	}

 	return buf;

 fail:
 	ALOGE("failed to allocate pipe buffer");
 	if (buf->resource)
 		pipe_resource_reference(&buf->resource, NULL);
 	FREE(buf);

 	return NULL;
 }

 static struct gralloc_drm_bo_t *pipe_alloc(struct gralloc_drm_drv_t *drv,
 		struct gralloc_drm_handle_t *handle)
 {
 	struct pipe_manager *pm = (struct pipe_manager *) drv;
 	struct pipe_buffer *buf;

 	pthread_mutex_lock(&pm->mutex);
 	buf = get_pipe_buffer_locked(pm, handle);
 	pthread_mutex_unlock(&pm->mutex);

 	if (buf) {
 		handle->name = (int) buf->winsys.handle;
 		handle->stride = (int) buf->winsys.stride;

 		buf->base.handle = handle;
 	}

 	return &buf->base;
 }

 static void pipe_free(struct gralloc_drm_drv_t *drv, struct gralloc_drm_bo_t *bo)
 {
 	struct pipe_manager *pm = (struct pipe_manager *) drv;
 	struct pipe_buffer *buf = (struct pipe_buffer *) bo;

 	pthread_mutex_lock(&pm->mutex);

 	if (buf->transfer)
 		pipe_transfer_unmap(pm->context, buf->transfer);
 	pipe_resource_reference(&buf->resource, NULL);

 	pthread_mutex_unlock(&pm->mutex);

 	FREE(buf);
 }

 static int pipe_map(struct gralloc_drm_drv_t *drv,
 		struct gralloc_drm_bo_t *bo, int x, int y, int w, int h,
 		int enable_write, void **addr)
 {
 	struct pipe_manager *pm = (struct pipe_manager *) drv;
 	struct pipe_buffer *buf = (struct pipe_buffer *) bo;
 	int err = 0;

 	pthread_mutex_lock(&pm->mutex);

 	/* need a context to get transfer */
 	if (!pm->context) {
 		pm->context = pm->screen->context_create(pm->screen, NULL);
 		if (!pm->context) {
 			ALOGE("failed to create pipe context");
 			err = -ENOMEM;
 		}
 	}

 	if (!err) {
 		enum pipe_transfer_usage usage;

 		usage = PIPE_TRANSFER_READ;
 		if (enable_write)
 			usage |= PIPE_TRANSFER_WRITE;

 		assert(!buf->transfer);

 		/*
 		 * ignore x, y, w and h so that returned addr points at the
 		 * start of the buffer
 		 */
 		*addr = pipe_transfer_map(pm->context, buf->resource,
 					  0, 0, usage, 0, 0,
 					  buf->resource->width0, buf->resource->height0,
 					  &buf->transfer);
 		if (*addr == NULL)
 			err = -ENOMEM;
 	}

 	pthread_mutex_unlock(&pm->mutex);

 	return err;
 }

 static void pipe_unmap(struct gralloc_drm_drv_t *drv,
 		struct gralloc_drm_bo_t *bo)
 {
 	struct pipe_manager *pm = (struct pipe_manager *) drv;
 	struct pipe_buffer *buf = (struct pipe_buffer *) bo;

 	pthread_mutex_lock(&pm->mutex);

 	assert(buf && buf->transfer);

 	pipe_transfer_unmap(pm->context, buf->transfer);
 	buf->transfer = NULL;

 	pm->context->flush(pm->context, NULL, 0);

 	pthread_mutex_unlock(&pm->mutex);
 }

 static void pipe_destroy(struct gralloc_drm_drv_t *drv)
 {
 	struct pipe_manager *pm = (struct pipe_manager *) drv;

 	if (pm->context)
 		pm->context->destroy(pm->context);
 	pm->screen->destroy(pm->screen);
 	FREE(pm);
 }

 /* for nouveau */
 #include "nouveau/drm/nouveau_drm_public.h"
 /* for r300 */
 #include "radeon/drm/radeon_drm_public.h"
 #include "r300/r300_public.h"
 /* for r600 */
 #include "radeon/drm/radeon_winsys.h"
 #include "r600/r600_public.h"
 /* for vmwgfx */
 #include "svga/drm/svga_drm_public.h"
 #include "svga/svga_winsys.h"
 #include "svga/svga_public.h"
 /* for debug */
 #include "target-helpers/inline_debug_helper.h"

 static int pipe_init_screen(struct pipe_manager *pm)
 {
 	struct pipe_screen *screen = NULL;

 #ifdef ENABLE_PIPE_NOUVEAU
 	if (strcmp(pm->driver, "nouveau") == 0)
 		screen = nouveau_drm_screen_create(pm->fd);
 #endif
 #ifdef ENABLE_PIPE_R300
 	if (strcmp(pm->driver, "r300") == 0) {
 		struct radeon_winsys *sws = radeon_drm_winsys_create(pm->fd);

 		if (sws) {
 			screen = r300_screen_create(sws);
 			if (!screen)
 				sws->destroy(sws);
 		}
 	}
 #endif
 #ifdef ENABLE_PIPE_R600
 	if (strcmp(pm->driver, "r600") == 0) {
 		struct radeon_winsys *sws = radeon_drm_winsys_create(pm->fd);

 		if (sws) {
 			screen = r600_screen_create(sws);
 			if (!screen)
 				sws->destroy(sws);
 		}
 	}
 #endif
 #ifdef ENABLE_PIPE_VMWGFX
 	if (strcmp(pm->driver, "vmwgfx") == 0) {
 		struct svga_winsys_screen *sws =
 			svga_drm_winsys_screen_create(pm->fd);

 		if (sws) {
 			screen = svga_screen_create(sws);
 			if (!screen)
 				sws->destroy(sws);
 		}
 	}
 #endif

 	if (!screen) {
 		ALOGW("failed to create screen for %s", pm->driver);
 		return -EINVAL;
 	}

 	pm->screen = debug_screen_wrap(screen);

 	return 0;
 }

 #include <xf86drm.h>
 #include <i915_drm.h>
 #include <radeon_drm.h>
 static int pipe_get_pci_id(struct pipe_manager *pm,
 		const char *name, int *vendor, int *device)
 {
 	int err = -EINVAL;

 	if (strcmp(name, "i915") == 0) {
 		struct drm_i915_getparam gp;

 		*vendor = 0x8086;

 		memset(&gp, 0, sizeof(gp));
 		gp.param = I915_PARAM_CHIPSET_ID;
 		gp.value = device;
 		err = drmCommandWriteRead(pm->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 	}
 	else if (strcmp(name, "radeon") == 0) {
 		struct drm_radeon_info info;

 		*vendor = 0x1002;

 		memset(&info, 0, sizeof(info));
 		info.request = RADEON_INFO_DEVICE_ID;
 		info.value = (long) device;
 		err = drmCommandWriteRead(pm->fd, DRM_RADEON_INFO, &info, sizeof(info));
 	}
 	else if (strcmp(name, "nouveau") == 0) {
 		*vendor = 0x10de;
 		*device = 0;
 		err = 0;
 	}
 	else if (strcmp(name, "vmwgfx") == 0) {
 		*vendor = 0x15ad;
 		/* assume SVGA II */
 		*device = 0x0405;
 		err = 0;
 	}
 	else {
 		err = -EINVAL;
 	}

 	return err;
 }

 #define DRIVER_MAP_GALLIUM_ONLY
 #include "pci_ids/pci_id_driver_map.h"
 static int pipe_find_driver(struct pipe_manager *pm, const char *name)
 {
 	int vendor, device;
 	int err;
 	const char *driver;

 	err = pipe_get_pci_id(pm, name, &vendor, &device);
 	if (!err) {
 		int idx;

 		/* look up in the driver map */
 		for (idx = 0; driver_map[idx].driver; idx++) {
 			int i;

 			if (vendor != driver_map[idx].vendor_id)
 				continue;

 			if (driver_map[idx].num_chips_ids == -1)
 				break;

 			for (i = 0; i < driver_map[idx].num_chips_ids; i++) {
 				if (driver_map[idx].chip_ids[i] == device)
 					break;
 			}
 			if (i < driver_map[idx].num_chips_ids)
 				break;
 		}

 		driver = driver_map[idx].driver;
 		err = (driver) ? 0 : -ENODEV;
 	}
 	else {
 		if (strcmp(name, "vmwgfx") == 0) {
 			driver = "vmwgfx";
 			err = 0;
 		}
 	}

 	if (!err)
 		strncpy(pm->driver, driver, sizeof(pm->driver) - 1);

 	return err;
 }

 struct gralloc_drm_drv_t *gralloc_drm_drv_create_for_pipe(int fd, const char *name)
 {
 	struct pipe_manager *pm;

 	pm = CALLOC(1, sizeof(*pm));
 	if (!pm) {
 		ALOGE("failed to allocate pipe manager for %s", name);
 		return NULL;
 	}

 	pm->fd = fd;
 	pthread_mutex_init(&pm->mutex, NULL);

 	if (pipe_find_driver(pm, name)) {
 		FREE(pm);
 		return NULL;
 	}

 	if (pipe_init_screen(pm)) {
 		FREE(pm);
 		return NULL;
 	}

 	pm->base.destroy = pipe_destroy;
 	pm->base.alloc = pipe_alloc;
 	pm->base.free = pipe_free;
 	pm->base.map = pipe_map;
 	pm->base.unmap = pipe_unmap;

 	return &pm->base;
 }
	/*
	* Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
	* Copyright (C) 2010-2011 LunarG Inc.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included
	* in all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*/

	#define LOG_TAG "GRALLOC-PIPE"

	#include <cutils/log.h>
	#include <errno.h>

	#include <pipe/p_screen.h>
	#include <pipe/p_context.h>
	#include <state_tracker/drm_driver.h>
	#include <util/u_inlines.h>
	#include <util/u_memory.h>

	#include "gralloc_drm.h"
	#include "gralloc_drm_priv.h"

	struct pipe_manager {
	struct gralloc_drm_drv_t base;

	int fd;
	char driver[16];
	pthread_mutex_t mutex;
	struct pipe_screen *screen;
	struct pipe_context *context;
	};

	struct pipe_buffer {
	struct gralloc_drm_bo_t base;

	struct pipe_resource *resource;
	struct winsys_handle winsys;

	struct pipe_transfer *transfer;
	};

	static enum pipe_format get_pipe_format(int format)
	{
	enum pipe_format fmt;

	switch (format) {
	case HAL_PIXEL_FORMAT_RGBA_8888:
	fmt = PIPE_FORMAT_R8G8B8A8_UNORM;
	break;
	case HAL_PIXEL_FORMAT_RGBX_8888:
	fmt = PIPE_FORMAT_R8G8B8X8_UNORM;
	break;
	case HAL_PIXEL_FORMAT_RGB_888:
	fmt = PIPE_FORMAT_R8G8B8_UNORM;
	break;
	case HAL_PIXEL_FORMAT_RGB_565:
	fmt = PIPE_FORMAT_B5G6R5_UNORM;
	break;
	case HAL_PIXEL_FORMAT_BGRA_8888:
	fmt = PIPE_FORMAT_B8G8R8A8_UNORM;
	break;
	case HAL_PIXEL_FORMAT_YV12:
	case HAL_PIXEL_FORMAT_DRM_NV12:
	case HAL_PIXEL_FORMAT_YCbCr_422_SP:
	case HAL_PIXEL_FORMAT_YCrCb_420_SP:
	default:
	fmt = PIPE_FORMAT_NONE;
	break;
	}

	return fmt;
	}

	static unsigned get_pipe_bind(int usage)
	{
	unsigned bind = PIPE_BIND_SHARED;

	if (usage & GRALLOC_USAGE_SW_READ_MASK)
	bind \|= PIPE_BIND_TRANSFER_READ;
	if (usage & GRALLOC_USAGE_SW_WRITE_MASK)
	bind \|= PIPE_BIND_TRANSFER_WRITE;

	if (usage & GRALLOC_USAGE_HW_TEXTURE)
	bind \|= PIPE_BIND_SAMPLER_VIEW;
	if (usage & GRALLOC_USAGE_HW_RENDER)
	bind \|= PIPE_BIND_RENDER_TARGET;
	if (usage & GRALLOC_USAGE_HW_FB) {
	bind \|= PIPE_BIND_RENDER_TARGET;
	bind \|= PIPE_BIND_SCANOUT;
	}

	return bind;
	}

	static struct pipe_buffer get_pipe_buffer_locked(struct pipe_manager pm,
	const struct gralloc_drm_handle_t *handle)
	{
	struct pipe_buffer *buf;
	struct pipe_resource templ;

	memset(&templ, 0, sizeof(templ));
	templ.format = get_pipe_format(handle->format);
	templ.bind = get_pipe_bind(handle->usage);
	templ.target = PIPE_TEXTURE_2D;

	if (templ.format == PIPE_FORMAT_NONE \|\|
	!pm->screen->is_format_supported(pm->screen, templ.format,
	templ.target, 0, templ.bind)) {
	ALOGE("unsupported format 0x%x", handle->format);
	return NULL;
	}

	buf = CALLOC(1, sizeof(*buf));
	if (!buf) {
	ALOGE("failed to allocate pipe buffer");
	return NULL;
	}

	templ.width0 = handle->width;
	templ.height0 = handle->height;
	templ.depth0 = 1;
	templ.array_size = 1;

	if (handle->name) {
	buf->winsys.type = DRM_API_HANDLE_TYPE_SHARED;
	buf->winsys.handle = handle->name;
	buf->winsys.stride = handle->stride;

	buf->resource = pm->screen->resource_from_handle(pm->screen,
	&templ, &buf->winsys);
	if (!buf->resource)
	goto fail;
	}
	else {
	buf->resource =
	pm->screen->resource_create(pm->screen, &templ);
	if (!buf->resource)
	goto fail;

	buf->winsys.type = DRM_API_HANDLE_TYPE_SHARED;
	if (!pm->screen->resource_get_handle(pm->screen,
	buf->resource, &buf->winsys))
	goto fail;
	}

	/* need the gem handle for fb */
	if (handle->usage & GRALLOC_USAGE_HW_FB) {
	struct winsys_handle tmp;

	memset(&tmp, 0, sizeof(tmp));
	tmp.type = DRM_API_HANDLE_TYPE_KMS;
	if (!pm->screen->resource_get_handle(pm->screen,
	buf->resource, &tmp))
	goto fail;

	buf->base.fb_handle = tmp.handle;
	}

	return buf;

	fail:
	ALOGE("failed to allocate pipe buffer");
	if (buf->resource)
	pipe_resource_reference(&buf->resource, NULL);
	FREE(buf);

	return NULL;
	}

	static struct gralloc_drm_bo_t pipe_alloc(struct gralloc_drm_drv_t drv,
	struct gralloc_drm_handle_t *handle)
	{
	struct pipe_manager pm = (struct pipe_manager ) drv;
	struct pipe_buffer *buf;

	pthread_mutex_lock(&pm->mutex);
	buf = get_pipe_buffer_locked(pm, handle);
	pthread_mutex_unlock(&pm->mutex);

	if (buf) {
	handle->name = (int) buf->winsys.handle;
	handle->stride = (int) buf->winsys.stride;

	buf->base.handle = handle;
	}

	return &buf->base;
	}

	static void pipe_free(struct gralloc_drm_drv_t drv, struct gralloc_drm_bo_t bo)
	{
	struct pipe_manager pm = (struct pipe_manager ) drv;
	struct pipe_buffer buf = (struct pipe_buffer ) bo;

	pthread_mutex_lock(&pm->mutex);

	if (buf->transfer)
	pipe_transfer_unmap(pm->context, buf->transfer);
	pipe_resource_reference(&buf->resource, NULL);

	pthread_mutex_unlock(&pm->mutex);

	FREE(buf);
	}

	static int pipe_map(struct gralloc_drm_drv_t *drv,
	struct gralloc_drm_bo_t *bo, int x, int y, int w, int h,
	int enable_write, void **addr)
	{
	struct pipe_manager pm = (struct pipe_manager ) drv;
	struct pipe_buffer buf = (struct pipe_buffer ) bo;
	int err = 0;

	pthread_mutex_lock(&pm->mutex);

	/* need a context to get transfer */
	if (!pm->context) {
	pm->context = pm->screen->context_create(pm->screen, NULL);
	if (!pm->context) {
	ALOGE("failed to create pipe context");
	err = -ENOMEM;
	}
	}

	if (!err) {
	enum pipe_transfer_usage usage;

	usage = PIPE_TRANSFER_READ;
	if (enable_write)
	usage \|= PIPE_TRANSFER_WRITE;

	assert(!buf->transfer);

	/*
	* ignore x, y, w and h so that returned addr points at the
	* start of the buffer
	*/
	*addr = pipe_transfer_map(pm->context, buf->resource,
	0, 0, usage, 0, 0,
	buf->resource->width0, buf->resource->height0,
	&buf->transfer);
	if (*addr == NULL)
	err = -ENOMEM;
	}

	pthread_mutex_unlock(&pm->mutex);

	return err;
	}

	static void pipe_unmap(struct gralloc_drm_drv_t *drv,
	struct gralloc_drm_bo_t *bo)
	{
	struct pipe_manager pm = (struct pipe_manager ) drv;
	struct pipe_buffer buf = (struct pipe_buffer ) bo;

	pthread_mutex_lock(&pm->mutex);

	assert(buf && buf->transfer);

	pipe_transfer_unmap(pm->context, buf->transfer);
	buf->transfer = NULL;

	pm->context->flush(pm->context, NULL, 0);

	pthread_mutex_unlock(&pm->mutex);
	}

	static void pipe_destroy(struct gralloc_drm_drv_t *drv)
	{
	struct pipe_manager pm = (struct pipe_manager ) drv;

	if (pm->context)
	pm->context->destroy(pm->context);
	pm->screen->destroy(pm->screen);
	FREE(pm);
	}

	/* for nouveau */
	#include "nouveau/drm/nouveau_drm_public.h"
	/* for r300 */
	#include "radeon/drm/radeon_drm_public.h"
	#include "r300/r300_public.h"
	/* for r600 */
	#include "radeon/drm/radeon_winsys.h"
	#include "r600/r600_public.h"
	/* for vmwgfx */
	#include "svga/drm/svga_drm_public.h"
	#include "svga/svga_winsys.h"
	#include "svga/svga_public.h"
	/* for debug */
	#include "target-helpers/inline_debug_helper.h"

	static int pipe_init_screen(struct pipe_manager *pm)
	{
	struct pipe_screen *screen = NULL;

	#ifdef ENABLE_PIPE_NOUVEAU
	if (strcmp(pm->driver, "nouveau") == 0)
	screen = nouveau_drm_screen_create(pm->fd);
	#endif
	#ifdef ENABLE_PIPE_R300
	if (strcmp(pm->driver, "r300") == 0) {
	struct radeon_winsys *sws = radeon_drm_winsys_create(pm->fd);

	if (sws) {
	screen = r300_screen_create(sws);
	if (!screen)
	sws->destroy(sws);
	}
	}
	#endif
	#ifdef ENABLE_PIPE_R600
	if (strcmp(pm->driver, "r600") == 0) {
	struct radeon_winsys *sws = radeon_drm_winsys_create(pm->fd);

	if (sws) {
	screen = r600_screen_create(sws);
	if (!screen)
	sws->destroy(sws);
	}
	}
	#endif
	#ifdef ENABLE_PIPE_VMWGFX
	if (strcmp(pm->driver, "vmwgfx") == 0) {
	struct svga_winsys_screen *sws =
	svga_drm_winsys_screen_create(pm->fd);

	if (sws) {
	screen = svga_screen_create(sws);
	if (!screen)
	sws->destroy(sws);
	}
	}
	#endif

	if (!screen) {
	ALOGW("failed to create screen for %s", pm->driver);
	return -EINVAL;
	}

	pm->screen = debug_screen_wrap(screen);

	return 0;
	}

	#include <xf86drm.h>
	#include <i915_drm.h>
	#include <radeon_drm.h>
	static int pipe_get_pci_id(struct pipe_manager *pm,
	const char name, int vendor, int *device)
	{
	int err = -EINVAL;

	if (strcmp(name, "i915") == 0) {
	struct drm_i915_getparam gp;

	*vendor = 0x8086;

	memset(&gp, 0, sizeof(gp));
	gp.param = I915_PARAM_CHIPSET_ID;
	gp.value = device;
	err = drmCommandWriteRead(pm->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
	}
	else if (strcmp(name, "radeon") == 0) {
	struct drm_radeon_info info;

	*vendor = 0x1002;

	memset(&info, 0, sizeof(info));
	info.request = RADEON_INFO_DEVICE_ID;
	info.value = (long) device;
	err = drmCommandWriteRead(pm->fd, DRM_RADEON_INFO, &info, sizeof(info));
	}
	else if (strcmp(name, "nouveau") == 0) {
	*vendor = 0x10de;
	*device = 0;
	err = 0;
	}
	else if (strcmp(name, "vmwgfx") == 0) {
	*vendor = 0x15ad;
	/* assume SVGA II */
	*device = 0x0405;
	err = 0;
	}
	else {
	err = -EINVAL;
	}

	return err;
	}

	#define DRIVER_MAP_GALLIUM_ONLY
	#include "pci_ids/pci_id_driver_map.h"
	static int pipe_find_driver(struct pipe_manager pm, const char name)
	{
	int vendor, device;
	int err;
	const char *driver;

	err = pipe_get_pci_id(pm, name, &vendor, &device);
	if (!err) {
	int idx;

	/* look up in the driver map */
	for (idx = 0; driver_map[idx].driver; idx++) {
	int i;

	if (vendor != driver_map[idx].vendor_id)
	continue;

	if (driver_map[idx].num_chips_ids == -1)
	break;

	for (i = 0; i < driver_map[idx].num_chips_ids; i++) {
	if (driver_map[idx].chip_ids[i] == device)
	break;
	}
	if (i < driver_map[idx].num_chips_ids)
	break;
	}

	driver = driver_map[idx].driver;
	err = (driver) ? 0 : -ENODEV;
	}
	else {
	if (strcmp(name, "vmwgfx") == 0) {
	driver = "vmwgfx";
	err = 0;
	}
	}

	if (!err)
	strncpy(pm->driver, driver, sizeof(pm->driver) - 1);

	return err;
	}

	struct gralloc_drm_drv_t gralloc_drm_drv_create_for_pipe(int fd, const char name)
	{
	struct pipe_manager *pm;

	pm = CALLOC(1, sizeof(*pm));
	if (!pm) {
	ALOGE("failed to allocate pipe manager for %s", name);
	return NULL;
	}

	pm->fd = fd;
	pthread_mutex_init(&pm->mutex, NULL);

	if (pipe_find_driver(pm, name)) {
	FREE(pm);
	return NULL;
	}

	if (pipe_init_screen(pm)) {
	FREE(pm);
	return NULL;
	}

	pm->base.destroy = pipe_destroy;
	pm->base.alloc = pipe_alloc;
	pm->base.free = pipe_free;
	pm->base.map = pipe_map;
	pm->base.unmap = pipe_unmap;

	return &pm->base;
	}