[PATCH 3/4] drm/xe/xe2: Limit ccs framebuffers to tile4 only

[Juha-Pekka Heikkila]

Display engine support ccs only with tile4, prevent other modifiers
from using compressed memory.

Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
---
 drivers/gpu/drm/xe/display/xe_fb_pin.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index 722c84a56607..fab0871f0cdf 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -10,9 +10,18 @@
 #include "intel_fb_pin.h"
 #include "xe_ggtt.h"
 #include "xe_gt.h"
+#include "xe_pat.h"
 
 #include <drm/ttm/ttm_bo.h>
 
+static bool is_compressed(const struct drm_framebuffer *fb)
+{
+	struct xe_bo *bo = intel_fb_obj(fb);
+	struct xe_device *xe = to_xe_device(to_intel_framebuffer(fb)->base.dev);
+
+	return xe_pat_index_has_compression(xe, bo->pat_index);
+}
+
 static void
 write_dpt_rotated(struct xe_bo *bo, struct iosys_map *map, u32 *dpt_ofs, u32 bo_ofs,
 		  u32 width, u32 height, u32 src_stride, u32 dst_stride)
@@ -283,6 +292,17 @@ static struct i915_vma *__xe_pin_fb_vma(struct intel_framebuffer *fb,
 	if (ret)
 		goto err;
 
+	if (GRAPHICS_VER(xe) >= 20) {
+		if (fb->base.modifier != I915_FORMAT_MOD_4_TILED &&
+		    is_compressed(&fb->base)) {
+			drm_warn(&xe->drm, "Cannot create ccs framebuffer with other than tile4 mofifier\n");
+			ttm_bo_unreserve(&bo->ttm);
+			ret = -EINVAL;
+			goto err;
+		}
+		bo->has_sealed_pat_index = true;
+	}
+
 	if (IS_DGFX(xe))
 		ret = xe_bo_migrate(bo, XE_PL_VRAM0);
 	else
@@ -308,6 +328,7 @@ static struct i915_vma *__xe_pin_fb_vma(struct intel_framebuffer *fb,
 	ttm_bo_unpin(&bo->ttm);
 	ttm_bo_unreserve(&bo->ttm);
 err:
+	bo->has_sealed_pat_index = false;
 	kfree(vma);
 	return ERR_PTR(ret);
 }
@@ -323,6 +344,8 @@ static void __xe_unpin_fb_vma(struct i915_vma *vma)
 		 vma->bo->ggtt_node.start != vma->node.start)
 		xe_ggtt_remove_node(ggtt, &vma->node);
 
+	vma->bo->has_sealed_pat_index = false;
+
 	ttm_bo_reserve(&vma->bo->ttm, false, false, NULL);
 	ttm_bo_unpin(&vma->bo->ttm);
 	ttm_bo_unreserve(&vma->bo->ttm);
-- 
2.25.1