• Thomas Hellstrom's avatar
    drm: Add the TTM GPU memory manager subsystem. · ba4e7d97
    Thomas Hellstrom authored
    TTM is a GPU memory manager subsystem designed for use with GPU
    devices with various memory types (On-card VRAM, AGP,
    PCI apertures etc.). It's essentially a helper library that assists
    the DRM driver in creating and managing persistent buffer objects.
    TTM manages placement of data and CPU map setup and teardown on
    data movement. It can also optionally manage synchronization of
    data on a per-buffer-object level.
    TTM takes care to provide an always valid virtual user-space address
    to a buffer object which makes user-space sub-allocation of
    big buffer objects feasible.
    TTM uses a fine-grained per buffer-object locking scheme, taking
    care to release all relevant locks when waiting for the GPU.
    Although this implies some locking overhead, it's probably a big
    win for devices with multiple command submission mechanisms, since
    the lock contention will be minimal.
    TTM can be used with whatever user-space interface the driver
    chooses, including GEM. It's used by the upcoming Radeon KMS DRM driver
    and is also the GPU memory management core of various new experimental
    DRM drivers.
    Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
    Signed-off-by: default avatarJerome Glisse <jglisse@redhat.com>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
ttm_module.h 2.04 KB