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drm/i915/gem: Poison stolen pages before use

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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@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201019165005.18128-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-10-19 17:50:04 +01:00
parent fa812ce96a
commit d7085b0faa
1 changed files with 45 additions and 0 deletions
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45
drivers/gpu/drm/i915/gem/i915_gem_stolen.c
View file

@ -495,6 +495,40 @@ static int i915_gem_init_stolen(struct drm_i915_private *i915)
return 0;
}
static void dbg_poison(struct i915_ggtt *ggtt,
dma_addr_t addr, resource_size_t size,
u8 x)
{
#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
if (!drm_mm_node_allocated(&ggtt->error_capture))
return;
GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE));
mutex_lock(&ggtt->error_mutex);
while (size) {
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_io(s, x, PAGE_SIZE);
io_mapping_unmap(s);
addr += PAGE_SIZE;
size -= PAGE_SIZE;
}
mb();
ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
mutex_unlock(&ggtt->error_mutex);
#endif
}
static struct sg_table *
i915_pages_create_for_stolen(struct drm_device *dev,
resource_size_t offset, resource_size_t size)
@ -538,6 +572,11 @@ static int i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
if (IS_ERR(pages))
return PTR_ERR(pages);
dbg_poison(&to_i915(obj->base.dev)->ggtt,
sg_dma_address(pages->sgl),
sg_dma_len(pages->sgl),
POISON_INUSE);
__i915_gem_object_set_pages(obj, pages, obj->stolen->size);
return 0;
@ -547,6 +586,12 @@ static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
/* Should only be called from i915_gem_object_release_stolen() */
dbg_poison(&to_i915(obj->base.dev)->ggtt,
sg_dma_address(pages->sgl),
sg_dma_len(pages->sgl),
POISON_FREE);
sg_free_table(pages);
kfree(pages);
}