[Intel-gfx] [PATCH v2] drm/i915/dmabuf: drop the flush on discrete

[Matthew Auld]

We were overzealous here; even though discrete is non-LLC, it should
still be always coherent.

v2(Thomas & Daniel)
  - Be extra cautious and limit to DG1
  - Add some more commentary

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
---
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index a45d0ec2c5b6..a2b485a1be8c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -250,8 +250,19 @@ static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
 	if (IS_ERR(pages))
 		return PTR_ERR(pages);
 
-	/* XXX: consider doing a vmap flush or something */
-	if (!HAS_LLC(i915) || i915_gem_object_can_bypass_llc(obj))
+	/*
+	 * DG1 is special here since it still snoops transactions even with
+	 * CACHE_NONE. This is not the case with other HAS_SNOOP platforms. We
+	 * might need to revisit this as we add new discrete platforms.
+	 *
+	 * XXX: Consider doing a vmap flush or something, where possible.
+	 * Currently we just do a heavy handed wbinvd_on_all_cpus() here since
+	 * the underlying sg_table might not even point to struct pages, so we
+	 * can't just call drm_clflush_sg or similar, like we do elsewhere in
+	 * the driver.
+	 */
+	if (i915_gem_object_can_bypass_llc(obj) ||
+	    (!HAS_LLC(i915) && !IS_DG1(i915)))
 		wbinvd_on_all_cpus();
 
 	sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
-- 
2.26.3