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drm/i915/buddy: adjust res->start

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Differentiate between mappable vs non-mappable resources, also if this
is an actual range allocation ensure we set res->start as the starting
pfn. Later when we need to do non-mappable -> mappable moves then we
want TTM to see that the current placement is not compatible, which
should result in an actual move, instead of being turned into a noop.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220225145502.331818-5-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2022-02-25 14:55:00 +00:00
parent 26ffcbbef7
commit f9eb742988
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
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@ -141,6 +141,13 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
mutex_unlock(&bman->lock);
}
if (place->lpfn - place->fpfn == n_pages)
bman_res->base.start = place->fpfn;
else if (lpfn <= bman->visible_size)
bman_res->base.start = 0;
else
bman_res->base.start = bman->visible_size;
*res = &bman_res->base;
return 0;