There's no reason that I can tell why this should be per-i915_buddy_mm
and doing so causes KMEM_CACHE to throw dmesg warnings because it tries
to create a debugfs entry with the name i915_buddy_block multiple times.
We could handle this by carefully giving each slab its own name but that
brings its own pain because then we have to store that string somewhere
and manage the lifetimes of the different slabs. The most likely
outcome would be a global atomic which we increment to get a new name or
something like that.
The much easier solution is to use the i915_globals system like we do
for every other slab in i915. This ensures that we have exactly one of
them for each i915 driver load and it gets neatly created on module load
and destroyed on module unload. Using the globals system also means
that its now tied into the shrink handler so we can properly respond to
low-memory situations.
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Fixes: 88be9a0a06 ("drm/i915/ttm: add ttm_buddy_man")
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Christian König <christian.koenig@amd.com>
[danvet: Rebase against removal of global shrink code]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721152358.2893314-7-jason@jlekstrand.net
Simple buddy allocator. We want to allocate properly aligned
power-of-two blocks to promote usage of huge-pages for the GTT, so 64K,
2M and possibly even 1G. While we do support allocating stuff at a
specific offset, it is more intended for preallocating portions of the
address space, say for an initial framebuffer, for other uses drm_mm is
probably a much better fit. Anyway, hopefully this can all be thrown
away if we eventually move to having the core MM manage device memory.
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190809202926.14545-2-matthew.auld@intel.com
