The vma_heap allocator was originally designed to prefer high addresses
in order to find bugs in ANV's high address handling. However, there
are cases where you might want the allocator to prefer lower addresses
for some reason. This provides a configure bit for exactly this
purpose.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5019>
This new function lets you request to remove a specific address range
from the allocator. It returns true on success and leaves the allocator
unmodified and returns false on failure. It doesn't need to return an
offset because, if it succeeds, the offset passed in is the allocated
offset.
Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
This is simple linear-walk first-fit allocator roughly based on the
allocator in the radeon winsys code. This allocator has two primary
functional differences:
1) It cleanly returns 0 on allocation failure
2) It allocates addresses top-down instead of bottom-up.
The second one is needed for Intel because high addresses (with bit 47
set) need to be canonicalized in order to work properly. If we allocate
bottom-up, then high addresses will be very rare (if they ever happen).
We'd rather always have high addresses so that the canonicalization code
gets better testing.
v2: - [scott-ph] remove _heap_validate() if NDEBUG is defined (Jordan)
Reviewed-by: Scott D Phillips <scott.d.phillips@intel.com>
Tested-by: Scott D Phillips <scott.d.phillips@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
