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drm/i915/dmabuf: fix sg_table handling in map_dma_buf

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We need to iterate over the original entries here for the sg_table,
pulling out the struct page for each one, to be remapped. However
currently this incorrectly iterates over the final dma mapped entries,
which is likely just one gigantic sg entry if the iommu is enabled,
leading to us only mapping the first struct page (and any physically
contiguous pages following it), even if there is potentially lots more
data to follow.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7306
Fixes: 1286ff7397 ("i915: add dmabuf/prime buffer sharing support.")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Michael J. Ruhl <michael.j.ruhl@intel.com>
Cc: <stable@vger.kernel.org> # v3.5+
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221028155029.494736-1-matthew.auld@intel.com
(cherry picked from commit 28d52f99bb)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Matthew Auld
2022-10-28 16:50:26 +01:00
committed by Tvrtko Ursulin
parent f0c4d9fc9c
commit f90daa9759
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
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@@ -40,13 +40,13 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme
goto err;
}
ret = sg_alloc_table(st, obj->mm.pages->nents, GFP_KERNEL);
ret = sg_alloc_table(st, obj->mm.pages->orig_nents, GFP_KERNEL);
if (ret)
goto err_free;
src = obj->mm.pages->sgl;
dst = st->sgl;
for (i = 0; i < obj->mm.pages->nents; i++) {
for (i = 0; i < obj->mm.pages->orig_nents; i++) {
sg_set_page(dst, sg_page(src), src->length, 0);
dst = sg_next(dst);
src = sg_next(src);