On Fri, Dec 18, 2015 at 09:01:03PM +0100, Michał Winiarski wrote:
> According to bspec, some parts of HW require the addresses to be in
> a canonical form, where bits [63:48] == [47]. Let's convert addresses to
> canonical form prior to relocating and return converted offsets to
> userspace. We also need to make sure that userspace is using addresses
> in canonical form in case of softpin.
>
> v2: Whitespace fixup, gen8_canonical_addr description (Chris, Ville)
> v3: Rebase on top of softpin, fix a hole in relocate_entry,
> s/expect/require (Chris)
> v4: Handle softpin in validate_exec_list (Chris)
>
> Cc: Chris Wilson <[email protected]>
> Cc: Michel Thierry <[email protected]>
> Cc: Ville Syrjälä <[email protected]>
> Signed-off-by: Michał Winiarski <[email protected]>
> @@ -625,8 +645,9 @@ i915_gem_execbuffer_reserve_vma(struct i915_vma *vma,
> entry->flags |= __EXEC_OBJECT_HAS_FENCE;
> }
>
> - if (entry->offset != vma->node.start) {
> - entry->offset = vma->node.start;
> + offset = gen8_canonical_addr(vma->node.start);
> + if (entry->offset != offset) {
entry->offset is now in normal form.
> + entry->offset = offset;
> *need_reloc = true;
> }
But we need to convert back to canonical form again on the userspace
boundary (copy_to_user).
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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