[Intel-xe] [PATCH v2 12/14] drm/xe/display: annotate CC buffers with NEEDS_CPU_ACCESS

[Matthew Auld <matthew.auld@intel.com>]

The display code wants to read the clear color value from the buffer.
However if the buffer is the non-mappable part of lmem then we fail the
kmap. The simplest solution is to just mark the buffer with
XE_BO_NEEDS_CPU_ACCESS, which will either allocate the buffer in the
mappable part of lmem, or migrate it there.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/xe/display/xe_fb_pin.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index 65c0bc28a3d1..66e1309e21d8 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -203,6 +203,14 @@ static struct i915_vma *__xe_pin_fb_vma(struct intel_framebuffer *fb,
 	if (ret)
 		goto err;
 
+	/*
+	 * For this type of buffer we need to able to read from the CPU the
+	 * clear color value found in the buffer. This doesn't do anything on
+	 * non small-bar devices.
+	 */
+	if (intel_fb_rc_ccs_cc_plane(&fb->base) >= 0)
+		bo->flags |= XE_BO_NEEDS_CPU_ACCESS;
+
 	ret = xe_bo_validate(bo, NULL, true);
 	if (!ret)
 		ttm_bo_pin(&bo->ttm);
-- 
2.39.2