• Alex Williamson's avatar
    iommu: Add sysfs support for IOMMUs · c61959ec
    Alex Williamson authored
    IOMMUs currently have no common representation to userspace, most
    seem to have no representation at all aside from a few printks
    on bootup.  There are however features of IOMMUs that are useful
    to know about.  For instance the IOMMU might support superpages,
    making use of processor large/huge pages more important in a device
    assignment scenario.  It's also useful to create cross links between
    devices and IOMMU hardware units, so that users might be able to
    load balance their devices to avoid thrashing a single hardware unit.
    
    This patch adds a device create and destroy interface as well as
    device linking, making it very lightweight for an IOMMU driver to add
    basic support.  IOMMU drivers can provide additional attributes
    automatically by using an attribute_group.
    
    The attributes exposed are expected to be relatively device specific,
    the means to retrieve them certainly are, so there are currently no
    common attributes for the new class created here.
    Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
    c61959ec
sysfs-class-iommu 508 Bytes