游戏网站建设赚钱,新闻软文发稿平台,最近中文字幕在线mv免费,dedecms蓝色企业网站模板免费下载接前一篇文章#xff1a;libdrm全解析九 —— 源码全解析#xff08;6#xff09; 本文参考以下博文#xff1a;
DRM 驱动程序开发#xff08;VKMS#xff09;
特此致谢#xff01; 本文继续对include/drm/drm.h中实际功能宏定义进行讲解。
11. DRM_IOCTL_GEM_FLINK …接前一篇文章libdrm全解析九 —— 源码全解析6 本文参考以下博文
DRM 驱动程序开发VKMS
特此致谢 本文继续对include/drm/drm.h中实际功能宏定义进行讲解。
11. DRM_IOCTL_GEM_FLINK
第11个宏是DRM_IOCTL_GEM_FLINK相应代码如下
#define DRM_IOCTL_GEM_FLINK DRM_IOWR(0x0a, struct drm_gem_flink)
结合之前文章中的_IOWR(type,nr,size)的最终定义得到如下代码
#define DRM_IOCTL_GEM_FLINK ( ((3) 30) | ((d) 8) | ((0x0a) 0) | ((sizeof(struct drm_gem_flink)) 16) )
struct drm_gem_flink在同文件include/drm/drm.h中定义代码如下
/* DRM_IOCTL_GEM_FLINK ioctl argument type */
struct drm_gem_flink {/** Handle for the object being named */__u32 handle;/** Returned global name */__u32 name;
};
drm_gem_flink结构中各成员的意义代码注释描述得很清楚了在此无需赘述。
DRM_IOCTL_GEM_FLINK虽然并无直接对应的Userspace API即没有对应的封装但是libdrm源码中有多处直接对其进行了调用。
amdgpu/amdgpu_bo.c中
static int amdgpu_bo_export_flink(amdgpu_bo_handle bo)
{struct drm_gem_flink flink;int fd, dma_fd;uint32_t handle;int r;fd bo-dev-fd;handle bo-handle;if (bo-flink_name)return 0;……memset(flink, 0, sizeof(flink));flink.handle handle;r drmIoctl(fd, DRM_IOCTL_GEM_FLINK, flink);if (r)return r;……return r;
}etnaviv/etnaviv_bo.c中
/* get the global flink/DRI2 buffer name */
drm_public int etna_bo_get_name(struct etna_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) {return ret;}pthread_mutex_lock(table_lock);set_name(bo, req.name);pthread_mutex_unlock(table_lock);bo-reuse 0;}*name bo-name;return 0;
}
exynos/exynos_drm.c中
/** Get a gem global object name from a gem object handle.** bo: a exynos 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.*/
drm_public int exynos_bo_get_name(struct exynos_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;
}
freedreno/freedreno_bo.c中
drm_public int fd_bo_get_name(struct fd_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) {return ret;}pthread_mutex_lock(table_lock);set_name(bo, req.name);pthread_mutex_unlock(table_lock);bo-bo_reuse NO_CACHE;}*name bo-name;return 0;
}
intel/intel_bufmgr_gem.c中
static int
drm_intel_gem_bo_flink(drm_intel_bo *bo, uint32_t * name)
{drm_intel_bufmgr_gem *bufmgr_gem (drm_intel_bufmgr_gem *) bo-bufmgr;drm_intel_bo_gem *bo_gem (drm_intel_bo_gem *) bo;if (!bo_gem-global_name) {struct drm_gem_flink flink;memclear(flink);flink.handle bo_gem-gem_handle;if (drmIoctl(bufmgr_gem-fd, DRM_IOCTL_GEM_FLINK, flink))return -errno;pthread_mutex_lock(bufmgr_gem-lock);if (!bo_gem-global_name) {bo_gem-global_name flink.name;bo_gem-reusable false;HASH_ADD(name_hh, bufmgr_gem-name_table,global_name, sizeof(bo_gem-global_name),bo_gem);}pthread_mutex_unlock(bufmgr_gem-lock);}*name bo_gem-global_name;return 0;
}
nouveau/nouveau.c中
drm_public int
nouveau_bo_name_get(struct nouveau_bo *bo, uint32_t *name)
{struct drm_gem_flink req { .handle bo-handle };struct nouveau_drm *drm nouveau_drm(bo-device-object);struct nouveau_bo_priv *nvbo nouveau_bo(bo);*name nvbo-name;if (!*name) {int ret drmIoctl(drm-fd, DRM_IOCTL_GEM_FLINK, req);if (ret) {*name 0;return ret;}nvbo-name *name req.name;nouveau_bo_make_global(nvbo);}return 0;
}
omap/omap_drm.c中
/* get the global flink/DRI2 buffer name */
drm_public int omap_bo_get_name(struct omap_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) {return ret;}bo-name req.name;}*name bo-name;return 0;
}
radeon/radeon_bo_gem.c中
drm_public int
radeon_gem_get_kernel_name(struct radeon_bo *bo, uint32_t *name)
{struct radeon_bo_gem *bo_gem (struct radeon_bo_gem*)bo;struct radeon_bo_int *boi (struct radeon_bo_int *)bo;struct drm_gem_flink flink;int r;if (bo_gem-name) {*name bo_gem-name;return 0;}flink.handle bo-handle;r drmIoctl(boi-bom-fd, DRM_IOCTL_GEM_FLINK, flink);if (r) {return r;}bo_gem-name flink.name;*name flink.name;return 0;
}
tegra/tegra.c中
drm_public int drm_tegra_bo_get_name(struct drm_tegra_bo *bo, uint32_t *name)
{struct drm_tegra *drm bo-drm;struct drm_gem_flink args;int err;memset(args, 0, sizeof(args));args.handle bo-handle;err drmIoctl(drm-fd, DRM_IOCTL_GEM_FLINK, args);if (err 0)return err;if (name)*name args.name;return 0;
}
这里顺带把各种显卡都列出来了。每种显卡都会调用DRM_IOCTL_GEM_FLINK对应的drmIoctl。
其余宏定义将在后续文章中继续解析。
