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drm/i915/dmabuf: add paranoid flush-on-acquire

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As pointed out by Thomas, we likely need to flush the pages here if the
GPU can read the page contents directly from main memory. Underneath we
don't know what the sg_table is pointing to, so just add a
wbinvd_on_all_cpus() here, for now.

Reported-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018174508.2137279-4-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2021-10-18 18:45:03 +01:00
parent 30f1dccd29
commit a035154da4
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
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@ -232,6 +232,7 @@ struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags)
static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct sg_table *pages;
unsigned int sg_page_sizes;
@ -242,8 +243,11 @@ static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
if (IS_ERR(pages))
return PTR_ERR(pages);
sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
/* XXX: consider doing a vmap flush or something */
if (!HAS_LLC(i915) || i915_gem_object_can_bypass_llc(obj))
wbinvd_on_all_cpus();
sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
__i915_gem_object_set_pages(obj, pages, sg_page_sizes);
return 0;