On Tue, Dec 13, 2016 at 04:00:59PM +0000, Matthew Auld wrote:
> If we move the sanity checking from gen8_alloc_va_range_3lvl and
> gen6_alloc_va_range into i915_vma_bind, we will increase our coverage to
> now both callbacks. We also convert each WARN_ON over to a GEM_WARN_ON.
>
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Chris Wilson <[email protected]>
> Suggested-by: Chris Wilson <[email protected]>
> Signed-off-by: Matthew Auld <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_gem_gtt.c | 12 ------------
> drivers/gpu/drm/i915/i915_vma.c | 6 ++++++
> 2 files changed, 6 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
> b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index ef00d36680c9..4f405b445b6c 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -1303,15 +1303,6 @@ static int gen8_alloc_va_range_3lvl(struct
> i915_address_space *vm,
> uint32_t pdpes = I915_PDPES_PER_PDP(dev_priv);
> int ret;
>
> - /* Wrap is never okay since we can only represent 48b, and we don't
> - * actually use the other side of the canonical address space.
> - */
> - if (WARN_ON(start + length < start))
> - return -ENODEV;
> -
> - if (WARN_ON(start + length > vm->total))
> - return -ENODEV;
> -
> ret = alloc_gen8_temp_bitmaps(&new_page_dirs, &new_page_tables, pdpes);
> if (ret)
> return ret;
> @@ -1929,9 +1920,6 @@ static int gen6_alloc_va_range(struct
> i915_address_space *vm,
> uint32_t pde;
> int ret;
>
> - if (WARN_ON(start_in + length_in > ppgtt->base.total))
> - return -ENODEV;
> -
> start = start_save = start_in;
> length = length_save = length_in;
>
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index 37c3eebe8316..9e121222c5eb 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -176,6 +176,12 @@ int i915_vma_bind(struct i915_vma *vma, enum
> i915_cache_level cache_level,
> if (bind_flags == 0)
> return 0;
#define range_overfows(start, size, max) ({
typeof(start) start__ = (start);
typeof(size) size__ = (size);
typeof(max) max__ = (max);
(void)(&start__ == &size__);
(void)(&start__ == &max__);
start > max || size > max - start;
})
if (GEM_WARN_ON(range_overflows(vma->node.start,
vma->node.size,
vma->vm->total))
return -ENODEV;
Then look at pread/pwrite for where we can reuse range_overflows(), e.g.
if (range_overflows(args->offset, args->size, obj->base.size)) {
Might need a range_overflows_t();
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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