On Fri, Oct 14, 2016 at 04:38:35PM +0100, Tvrtko Ursulin wrote:
>
> On 14/10/2016 16:18, Chris Wilson wrote:
> >The scattergather list uses a 32bit size counter, we should avoid
> >exceeding it.
> >
> >Fixes: 871dfbd67d4e ("drm/i915: Allow compaction upto SWIOTLB max segment size")
> >Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> >---
> > drivers/gpu/drm/i915/i915_gem.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> >index 0d1dc04302ec..858569419134 100644
> >--- a/drivers/gpu/drm/i915/i915_gem.c
> >+++ b/drivers/gpu/drm/i915/i915_gem.c
> >@@ -2238,7 +2238,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
> > max_segment = swiotlb_max_size();
> > if (!max_segment)
> >- max_segment = obj->base.size;
> >+ max_segment = rounddown(UINT_MAX, PAGE_SIZE);
> > st = kmalloc(sizeof(*st), GFP_KERNEL);
> > if (st == NULL)
>
> I suppose it could be possible to get more that 4GiB of of contiguous pages.
>
> sg_alloc_table_from_pages seems broken as well, for this, and more
> so, for using longs and stuffing them into ints.
Noticed I was using unsigned long max_segment. Any complaints if I
change that to unsigned int as well?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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