lib/intel_allocator_simple: Add simple allocator

Simple allocator borrowed from Mesa adopted for IGT use.

From default we prefer an allocation from the top of vm address space
(we can catch addressing issues pro-actively). When function
intel_allocator_simple_create() is used we exclude last page as HW
tends to hang on the render engine when full 3D pipeline is executed from
the last page. For more control of vm range user can specify range using
intel_allocator_simple_create_full() (with the respect of the gtt size).

v2: fix size calculation (don't allow to subtract number which can be
    negative - as we got for canonical addresses with 47 bit set - Jason)

v3: change to new igt_map implementation, add refcounts in allocator
    (according to Jason review comments)

v4: return ALLOC_INVALID_ADDRESS instead of assert for failed allocation

Signed-off-by: Dominik Grzegorzek <dominik.grzegorzek@intel.com>
Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Petri Latvala <petri.latvala@intel.com>

0 files changed, 0 insertions, 0 deletions