Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> When allocating objects from stolen, memset() the backing store to
> POISON_INUSE (0x5a) to help identify any uninitialised use of a stolen
> object.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 33 ++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> index 0be5e8683337..4c2869c0a802 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
> @@ -572,6 +572,38 @@ static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
> .release = i915_gem_object_release_stolen,
> };
>
> +static void dbg_poison(struct drm_i915_gem_object *obj)
> +{
> +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
> + struct drm_i915_private *i915 = to_i915(obj->base.dev);
> + struct i915_ggtt *ggtt = &i915->ggtt;
> + struct sgt_iter iter;
> + dma_addr_t addr;
> +
> + if (!drm_mm_node_allocated(&ggtt->error_capture))
> + return;
> +
> + mutex_lock(&ggtt->error_mutex);
> + for_each_sgt_daddr(addr, iter, obj->mm.pages) {
> + void __iomem *s;
> +
> + ggtt->vm.insert_page(&ggtt->vm, addr,
> + ggtt->error_capture.start,
> + I915_CACHE_NONE, 0);
> + mb();
> +
> + s = io_mapping_map_wc(&ggtt->iomap,
> + ggtt->error_capture.start,
> + PAGE_SIZE);
> + memset(s, POISON_INUSE, PAGE_SIZE);
> + io_mapping_unmap(s);
> + }
> + mb();
> + ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
> + mutex_unlock(&ggtt->error_mutex);
> +#endif
> +}
> +
> static struct drm_i915_gem_object *
> __i915_gem_object_create_stolen(struct intel_memory_region *mem,
> struct drm_mm_node *stolen)
> @@ -598,6 +630,7 @@ __i915_gem_object_create_stolen(struct intel_memory_region *mem,
> goto cleanup;
>
> i915_gem_object_init_memory_region(obj, mem, 0);
> + dbg_poison(obj);
>
> return obj;
>
> --
> 2.20.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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