1. 15 Jul, 2009 1 commit
  2. 14 Jun, 2009 1 commit
    • 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>
      ba4e7d97