lib/intel_allocator: Add few helper functions for common use

Add few helper functions which can be used in reloc/no-reloc tests.

Common name is get_<ALLOCATOR_TYPE>_ahnd(i915, ctx), like:
get_reloc_ahnd(), get_simple_ahnd(). As simple allows acquiring
offsets starting from top or bottom of vm additional two were added:
get_simple_l2h_ahnd() and get_simple_h2l_ahnd(). put_ahnd() closes
allocator handle (if it is valid).

To acquire / release an offset get_offset() and put_offset() were
added. When allocator handle is invalid (equal to zero) get_offset()
just returns 0, put_offset() does nothing in this case. We can then
call them regardless reloc/no-reloc code keeping conditional code in
these functions.

Be aware that each get_..._ahnd() functions calls checking kernel
relocation capabilities. This generates extra execbuf ioctl() call (but
without queueing job to gpu). If that is a problem and we want to avoid
additional execbuf calls, checking relocation caps should be done on the
beginning of the test. Allocator handle (open()) should be acquired then
conditionally according to the result of this check.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>

0 files changed, 0 insertions, 0 deletions