diff options
| author | Matthew Auld <matthew.auld@intel.com> | 2022-11-08 10:32:38 +0000 |
|---|---|---|
| committer | Matthew Auld <matthew.auld@intel.com> | 2022-11-09 10:07:22 +0000 |
| commit | 8c94951560ef29c455043bf2dfa2275b011edc66 (patch) | |
| tree | f6c9dc6fe66e250c83e561718c10e12bd4058a46 /drivers/gpu/drm/i915/gem/i915_gem_phys.c | |
| parent | ccb0e02787d0f80d0081c446aec3756dd8f7bfe0 (diff) | |
drm/i915: use i915_sg_dma_sizes() for all backends
We rely on page_sizes.sg in setup_scratch_page() reporting the correct
value if the underlying sgl is not contiguous, however in
get_pages_internal() we are only looking at the layout of the created
pages when calculating the sg_page_sizes, and not the final sgl, which
could in theory be completely different. In such a situation we might
incorrectly think we have a 64K scratch page, when it is actually only
4K or similar split over multiple non-contiguous entries, which could
lead to broken behaviour when touching the scratch space within the
padding of a 64K GTT page-table. For most of the other backends we
already just call i915_sg_dma_sizes() on the final mapping, so rather
just move that into __i915_gem_object_set_pages() to avoid such issues
coming back to bite us later.
v2: Update missing conversion in gvt
Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Stuart Summers <stuart.summers@intel.com>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221108103238.165447-1-matthew.auld@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_phys.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_phys.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c index 0d0e46dae559..68453572275b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c @@ -79,7 +79,7 @@ static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) /* We're no longer struct page backed */ obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE; - __i915_gem_object_set_pages(obj, st, sg->length); + __i915_gem_object_set_pages(obj, st); return 0; @@ -209,11 +209,8 @@ static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj) return 0; err_xfer: - if (!IS_ERR_OR_NULL(pages)) { - unsigned int sg_page_sizes = i915_sg_dma_sizes(pages->sgl); - - __i915_gem_object_set_pages(obj, pages, sg_page_sizes); - } + if (!IS_ERR_OR_NULL(pages)) + __i915_gem_object_set_pages(obj, pages); return err; } |