struct dma_buf_sync sync; sync.flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_END; // 设置同步标志 sync.offset = 0; // 设置偏移量 sync.size = 4096; // 设置大小 int ret = ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync); // 调用ioctl设置DMA传输参数 if (ret < 0) { perror("ioctl"); clo...
dma-buf: Update docs for SYNC ioctl Just a bit of wording polish plus mentioning that it can fail and must be restarted. Requested by Sumit. v2: Fix them typos (Hans). Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tiago Vignatti <tiago.vignatti@intel.com> Cc: Stéphane Marchesin ...
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...
/* Opcode to create DMA-BUF object for an existing devicememory allocation* and to export an FD of that DMA-BUF back to the caller */ #define HL_MEM_OP_EXPORT_DMABUF_FD 5 /* Opcode to create timestamps pool for user interrupts registration support * The memory will be allocated by ...
#include <sys/ioctl.h> int ioctl(int fd, unsigned long request, ...); /usr/src/linux-headers-4.10.0-35/include/uapi/linux/if.h /* * INET An implementation of...
受保护的 DMA 以绿色箭头显示。 PCI 设备也可以分配给来宾。 通过利用主机内核中的 VFIO 驱动程序,该设备可以由任何用户空间程序(如 QEMU)进行专门管理。 在分配了设备的来宾中,我们应该能够看到与主机中完全相同的设备(如虚线所示)。 在这里,虚拟机管理程序能够修改设备信息,例如功能位等。 通过将设备分配给访客,...
{unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;printk("enter simple_nopage_mmap: offset=%u, vma->vm_pgoff=%u/n", offset, vma->vm_pgoff);if (offset >= __pa(high_memory) || (filp->f_flags & O_SYNC))vma->vm_flags |= VM_IO;vma->vm_flags |= VM_RESERVED;vma->vm_...
數據集管理 (DSM) 通知會傳送至 IOCTL_SCSI_MINIPORT_DSM 控制程式代碼要求中的迷你埠驅動程式。 IOCTL_SCSI_MINIPORT_DSM要求是IOCTL_SCSI_MINIPORT的子IOCTL。 StorPort 所產生的這個 IOCTL 會回應 DSM 動作,然後將此 IOCTL 傳送至迷你埠作為 STORAGE_REQUEST_BLOCK (SRB) ,且函式類型為 SRB_FUNCTION_IO...
IEEE 1394 驱动程序使用 IRP_MJ_INTERNAL_DEVICE_CONTROL IRP(IoControlCode IOCTL_1394_CLASS)与总线驱动程序通信。 驱动程序可以通过此请求访问 IEEE 1394 总线及其主机控制器提供的所有操作。
Layered handle. Pointer to a credential structure used to open a device. Caller return value. (May be set by driver and is valid only if the ioctl() succeeds).