Support DMA_BUF_IOCTL_EXPORT_SYNC_FILE ioctl for llvmpipe #3891 cebtenzzre opened this issue Dec 18, 2024· 1 comment Comments cebtenzzre commented Dec 18, 2024 llvmpipe seems to require this ioctl under normal operation, which makes it hard to use rr to debug an application that use...
DMA缓冲区FD还支持一些特定于dma-buf的ioctl,请参阅下面的DMA缓冲区ioctl以获取详细信息。 基本操作和设备DMA访问 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...
* Userspace can perform a DMA_BUF_IOCTL_EXPORT_SYNC_FILE to retrieve the * current set of fences on a dma-buf file descriptor as a sync_file. CPU * waits via poll() or other driver-specific mechanisms typically wait on * whatever fences are on the dma-buf at the time th...
12 */ 13 14#include <linux/fs.h> 15#include <linux/slab.h> 16#include <linux/dma-buf.h> 17#include <linux/dma-fence.h> 18#include <linux/anon_inodes.h> 19#include <linux/export.h> 20#include <linux/debugfs.h> 21#include <linux/module.h> 22#include <linux/seq_file.h> 23#...
虚拟内存系统(TLB、页表等)将虚拟内存转换为CPU物理地址,存储为“phys_addr_t”或“resource_size_t”。内核管理设备资源,如寄存器, 将其视为物理地址, 存储在/proc/iomem 中。驱动程序不能直接使用该物理地址, 它必须使用 ioremap() 来映射它们的物理地址空间并生成虚拟地址。
/ drivers / dma-buf / udmabuf.c v6 v6.13 v6.12 v6.12.6 v6.12.5 v6.12.4 v6.12.3 v6.12.2 v6.12.1 v6.12 v6.12-rc7 v6.12-rc6 v6.12-rc5 v6.12-rc4 v6.12-rc3 v6.12-rc2 v6.12-rc1 v6.11 v6.10 v6.9 ...
coherency, DMA_BUF_IOCTL_SYNC must be used to bracket* any CPU access to give the kernel the chance to shuffle memory around if* needed.** Prior to accessing the map, the client must call DMA_BUF_IOCTL_SYNC* with DMA_BUF_SYNC_START and the appropriate read/write flags. Once the* ...
err_dmabuf:dma_buf_put(dmabuf);returnerr; } 开发者ID:wallento,项目名称:linux,代码行数:48,代码来源:i915_gem_dmabuf.c 示例4: ioctl_detach ▲点赞 1▼ intioctl_detach(intfd){/* when buffer-user is done using this buffer, it 'disconnects' itself from the ...
static long my_ioctl(struct file *fp, unsigned int cmd, unsigned long arg){ printk("my_ioctl ...
EDIT: Description has been rewritten as the initial test case was incorrect. Waypipe (package, workaround) relies on DMA_BUF_IOCTL_SYNC to check if a given file descripter is backed by DMABUF. On FreeBSD the ioctl always fails with EBADF...