On Sat, 19 Jan 2019 18:05:09 +0530 Steevan Rodrigues <steevanxpe...@gmail.com> wrote:
> Hello, > I am trying to port kernel mode driver for PCIe device to user space with > the help of VFIO. > I am wondering how to enable and disable pci bus mastering for the device ? > > In Kerenel mode we call pci_set_master() and pci_clear_master() . >From the vfio device file descriptor call the VFIO_DEVICE_GET_REGION_INFO ioctl with the VFIO_PCI_CONFIG_REGION_INDEX as the index field to get the offset of PCI config space for the device. Bus master is in the command register, which is a word register at offset 0x4 into PCI config space, so you'd do a read, modify, write using pread/pwrite or equivalent of the word at config space offset + 0x4, setting the but master bit within that word. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
