text: /*
   * Copyright (C) ROCKCHIP, Inc.
   * Author:yzq<yzq@rock-chips.com>
   *
   * based on exynos_drm.c
   *
   * 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 (including the next
   * paragraph) 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.
   *
   */
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  #include <errno.h>
  
  #include <sys/mman.h>
  #include <linux/stddef.h>
  
  #include <xf86drm.h>
  
  #include "rockchip_drm.h"
  #include "rockchip_drmif.h"
  
  /*
   * Create rockchip drm device object.
   *
   * @fd: file descriptor to rockchip drm driver opened.
   *
   * if true, return the device object else NULL.
   */
  struct rockchip_device *rockchip_device_create(int fd)
  {
  	struct rockchip_device *dev;
  
  	dev = calloc(1, sizeof(*dev));
  	if (!dev) {
  		fprintf(stderr, "failed to create device[%s].\n",
  				strerror(errno));
  		return NULL;
  	}
  
  	dev->fd = fd;
  
  	return dev;
  }
  
  /*
   * Destroy rockchip drm device object
   *
   * @dev: rockchip drm device object.
   */
  void rockchip_device_destroy(struct rockchip_device *dev)
  {
  	free(dev);
  }
  
  /*
   * Create a rockchip buffer object to rockchip drm device.
   *
   * @dev: rockchip drm device object.
   * @size: user-desired size.
   * flags: user-desired memory type.
   *	user can set one or more types among several types to memory
   *	allocation and cache attribute types. and as default,
   *	ROCKCHIP_BO_NONCONTIG and ROCKCHIP-BO_NONCACHABLE types would
   *	be used.
   *
   * if true, return a rockchip buffer object else NULL.
   */
  struct rockchip_bo *rockchip_bo_create(struct rockchip_device *dev,
  					size_t size, uint32_t flags)
  {
  	struct rockchip_bo *bo;
  	struct drm_rockchip_gem_create req = {
  		.size = size,
  		.flags = flags,
  	};
  
  	if (size == 0) {
  		fprintf(stderr, "invalid size.\n");
  		return NULL;
  	}
  
  	bo = calloc(1, sizeof(*bo));
  	if (!bo) {
  		fprintf(stderr, "failed to create bo[%s].\n",
  				strerror(errno));
  		goto fail;
  	}
  
  	bo->dev = dev;
  
  	if (drmIoctl(dev->fd, DRM_IOCTL_ROCKCHIP_GEM_CREATE, &req)){
  		fprintf(stderr, "failed to create gem object[%s].\n",
  				strerror(errno));
  		goto err_free_bo;
  	}
  
  	bo->handle = req.handle;
  	bo->size = size;
  	bo->flags = flags;
  
  	return bo;
  
  err_free_bo:
  	free(bo);
  fail:
  	return NULL;
  }
  
  struct rockchip_bo *rockchip_bo_from_handle(struct rockchip_device *dev,
  			uint32_t handle, uint32_t flags, uint32_t size)
  {
  	struct rockchip_bo *bo;
  
  	if (size == 0) {
  		fprintf(stderr, "invalid size.\n");
  		return NULL;
  	}
  
  	bo = calloc(1, sizeof(*bo));
  	if (!bo) {
  		fprintf(stderr, "failed to create bo[%s].\n",
  				strerror(errno));
  		return NULL;
  	}
  
  	bo->dev = dev;
  	bo->handle = handle;
  	bo->size = size;
  	bo->flags = flags;
  
  	return bo;
  }
  
  /*
   * Destroy a rockchip buffer object.
   *
   * @bo: a rockchip buffer object to be destroyed.
   */
  void rockchip_bo_destroy(struct rockchip_bo *bo)
  {
  	if (!bo)
  		return;
  
  	if (bo->vaddr)
  		munmap(bo->vaddr, bo->size);
  
  	if (bo->handle) {
  		struct drm_gem_close req = {
  			.handle = bo->handle,
  		};
  
  		drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_CLOSE, &req);
  	}
  
  	free(bo);
  }
  
  
  /*
   * Get a rockchip buffer object from a gem global object name.
   *
   * @dev: a rockchip device object.
   * @name: a gem global object name exported by another process.
   *
   * this interface is used to get a rockchip buffer object from a gem
   * global object name sent by another process for buffer sharing.
   *
   * if true, return a rockchip buffer object else NULL.
   *
   */
  struct rockchip_bo *rockchip_bo_from_name(struct rockchip_device *dev,
  						uint32_t name)
  {
  	struct rockchip_bo *bo;
  	struct drm_gem_open req = {
  		.name = name,
  	};
  
  	bo = calloc(1, sizeof(*bo));
  	if (!bo) {
  		fprintf(stderr, "failed to allocate bo[%s].\n",
  				strerror(errno));
  		return NULL;
  	}
  
  	if (drmIoctl(dev->fd, DRM_IOCTL_GEM_OPEN, &req)) {
  		fprintf(stderr, "failed to open gem object[%s].\n",
  				strerror(errno));
  		goto err_free_bo;
  	}
  
  	bo->dev = dev;
  	bo->name = name;
  	bo->handle = req.handle;
  
  	return bo;
  
  err_free_bo:
  	free(bo);
  	return NULL;
  }
  
  /*
   * Get a gem global object name from a gem object handle.
   *
   * @bo: a rockchip buffer object including gem handle.
   * @name: a gem global object name to be got by kernel driver.
   *
   * this interface is used to get a gem global object name from a gem object
   * handle to a buffer that wants to share it with another process.
   *
   * if true, return 0 else negative.
   */
  int rockchip_bo_get_name(struct rockchip_bo *bo, uint32_t *name)
  {
  	if (!bo->name) {
  		struct drm_gem_flink req = {
  			.handle = bo->handle,
  		};
  		int ret;
  
  		ret = drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_FLINK, &req);
  		if (ret) {
  			fprintf(stderr, "failed to get gem global name[%s].\n",
  					strerror(errno));
  			return ret;
  		}
  
  		bo->name = req.name;
  	}
  
  	*name = bo->name;
  
  	return 0;
  }
  
  uint32_t rockchip_bo_handle(struct rockchip_bo *bo)
  {
  	return bo->handle;
  }
  
  /*
   * Mmap a buffer to user space.
   *
   * @bo: a rockchip buffer object including a gem object handle to be mmapped
   *	to user space.
   *
   * if true, user pointer mmaped else NULL.
   */
  void *rockchip_bo_map(struct rockchip_bo *bo)
  {
  	if (!bo->vaddr) {
  		struct rockchip_device *dev = bo->dev;
  		struct drm_rockchip_gem_map_off req = {
  			.handle = bo->handle,
  		};
  		int ret;
  
  		ret = drmIoctl(dev->fd, DRM_IOCTL_ROCKCHIP_GEM_MAP_OFFSET, &req);
  		if (ret) {
  			fprintf(stderr, "failed to ioctl gem map offset[%s].\n",
  				strerror(errno));
  			return NULL;
  		}
  
  		bo->vaddr = mmap(0, bo->size, PROT_READ | PROT_WRITE,
  			   MAP_SHARED, dev->fd, req.offset);
  		if (bo->vaddr == MAP_FAILED) {
  			fprintf(stderr, "failed to mmap buffer[%s].\n",
  				strerror(errno));
  			return NULL;
  		}
  	}
  
  	return bo->vaddr;
  }
  