Quoting Matthew Auld (2017-09-22 18:32:39)
> For the 48b PPGTT try to align the vma start address to the required
> page size boundary to guarantee we use said page size in the gtt. If we
> are dealing with multiple page sizes, we can't guarantee anything and
> just align to the largest. For soft pinning and objects which need to be
> tightly packed into the lower 32bits we don't force any alignment.
>
> v2: various improvements suggested by Chris
>
> v3: use set_pages and better placement of page_sizes
>
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> } else {
> + /* We only support huge gtt pages through the 48b PPGTT,
> + * however we also don't want to force any alignment for
> + * objects which need to be tightly packed into the low 32bits.
> + */
> + if (end > (1ULL << 32) &&
gcc prefers
if (upper_32_bits(end) && vma->page_sizes.sg)
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
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