On 09/01/2011 03:00 PM, Michael S. Tsirkin wrote: > That's a very rich interface, and easy to get wrong. > AFAIK the only reason vfio uses read/write for PCI was to avoid inventing > a custom interface. But if you do, it looks like a set of ioctls would > be much easier? You can even fit the existing uio infrastructure if you like.
How would it be easier than producing/parsing a static data structure? What would it look like? > Here's another idea: all the information is likely already available > in sysfs. The only major thing that is likely available elsewhere is PCI config space, and that was not new to this proposal. Most other material is specifically related to the vfio/dtio interface (e.g. offsets into the file handle, arguments to the "get irq fd" ioctl, mapping of dtio regions/interrupts to device tree nodes), and could not be "useful to more than just vfio". > A way to query where the device is in sysfs > would give you *a ton* of information, including the type etc, For PCI, the user has domain/bus/dev/fn which should be sufficient to find that, if desired. For device-tree devices, there's a device tree path provided for each region/interrupt. -Scott
