dma_buf_export_info Exporter 设备必须实现的数据结构,dma_buf_export 将该结构转换为一个dma_buf struct dma_buf_export_info { const char *exp_name; struct module *owner; const struct dma_buf_ops *ops; // key ops size_t size; // vaddr size int flags; struct dma_resv *resv; void ...
struct dma_buf * dma_buf_export(void *priv, struct dma_buf_ops *ops, size_t size, int flags) 如果函数调用成功,则会创建一个数据结构dma_buf,返回其指针。同时还会创建一个匿名文件绑定在该缓冲区上,因此这个缓冲区可以由其他消费者共享了(实际上此时缓冲区可能并未真正创建,这里只是创建了一个抽象的d...
对于设备DMA访问共享DMA缓冲区,通常的操作序列相当简单: 导出者使用DEFINE_DMA_BUF_EXPORT_INFO()定义他的导出者实例,并调用dma_buf_export()将私有缓冲区对象封装成dma_buf。然后通过调用dma_buf_fd()将该dma_buf作为文件描述符导出到用户空间。 用户空间将这些文件描述符传递给所有希望共享该缓冲区的驱动程序:首...
1.特定模块需要分配连续内存,这时需要将cma相关flag告诉importer 2.graphic相关模块通过dma_buf_export()向dma_buf请求分配内存 3.dma_buf_fd返回fd到graphic用户空间 4.graphic传递fd到video decoder模块(如何实现fd传递不是本次讨论的重点,先略过) 5.video decoder模块通过dma_buf_get获取引用计数,并获得相关数据...
egl->eglExportDMABUFImageMESA(egl_display, share->image, &share->dmabuf_fd, &share->texinfo.stride, &share->texinfo.offset); 可惜的是,这个extension依赖于高通的芯片驱动支持,但是短期内无法上线,需要找其他出路了; 那么方式2来了,方式2)基于LInux协议的MESA_image_dma_buf_import扩展 ...
I have a deticated AMD GPU alongside my Integrated Intel GPU and It seemsFailed to export buffer to dma_bufhas been gone when I run chromium on my second GPU. $ DRI_PRIME=1 LIBVA_DRIBER_NAME=radeonsi chromium [10542:10542:0427/073252.506894:ERROR:browser_switcher_service.cc(238)] XXX ...
示例代码如下： 2. 子组件向父组件共享数据 子组件向父组件共享数据使用自定义事件。示例代码如下： ...
buffer objects of rendered surfaces (Y and UV) as contiguous in memory. This would avoid conversion on the export side and also make GL import easier with existing hardware. However, short the kernel managing that, we could modify the UMD to better expose the planes with non-contiguous ...
The Linux DRM (Direct Rendering Manager) interface (which is also implemented on some BSDs) provides a means for us to export handles to GPU resources. Mesa, the predominant implementation of userspace Linux graphics drivers, implements a protocol that allows EGL users to transfer handles to thei...
Run allreduce test with ring algorithm and SYCL USM device buffers: exportCCL_ATL_TRANSPORT=ofiexportCCL_ATL_HMEM=1exportCCL_ALLREDUCE=ringexportFI_PROVIDER=verbs mpiexec-n2<ccl_install_dir>/examples/sycl/sycl_allreduce_usm_test gpu device...