[PATCH v6 8/8] drm/xe: Only allow contiguous BOs to use xe_bo_vmap

[Matthew Brost <matthew.brost@intel.com>]

xe_bo_vmap only works on contiguous BOs, disallow xe_bo_vmap on BO
unless we are certain the BO is contiguous.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index 0cb014aba699..e1cbe1d5acef 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -162,6 +162,15 @@ static void try_add_system(struct xe_device *xe, struct xe_bo *bo,
 	}
 }
 
+static bool force_contiguous(u32 bo_flags)
+{
+	/*
+	 * For eviction / restore on suspend / resume objects pinned in VRAM
+	 * must be contiguous, also only contiguous BOs support xe_bo_vmap.
+	 */
+	return bo_flags & (XE_BO_FLAG_PINNED | XE_BO_FLAG_GGTT);
+}
+
 static void add_vram(struct xe_device *xe, struct xe_bo *bo,
 		     struct ttm_place *places, u32 bo_flags, u32 mem_type, u32 *c)
 {
@@ -175,12 +184,7 @@ static void add_vram(struct xe_device *xe, struct xe_bo *bo,
 	xe_assert(xe, vram && vram->usable_size);
 	io_size = vram->io_size;
 
-	/*
-	 * For eviction / restore on suspend / resume objects
-	 * pinned in VRAM must be contiguous
-	 */
-	if (bo_flags & (XE_BO_FLAG_PINNED |
-			XE_BO_FLAG_GGTT))
+	if (force_contiguous(bo_flags))
 		place.flags |= TTM_PL_FLAG_CONTIGUOUS;
 
 	if (io_size < vram->usable_size) {
@@ -212,8 +216,7 @@ static void try_add_stolen(struct xe_device *xe, struct xe_bo *bo,
 
 		bo->placements[*c] = (struct ttm_place) {
 			.mem_type = XE_PL_STOLEN,
-			.flags = bo_flags & (XE_BO_FLAG_PINNED |
-					     XE_BO_FLAG_GGTT) ?
+			.flags = force_contiguous(bo_flags) ?
 				TTM_PL_FLAG_CONTIGUOUS : 0,
 		};
 		*c += 1;
@@ -2026,13 +2029,15 @@ dma_addr_t xe_bo_addr(struct xe_bo *bo, u64 offset, size_t page_size)
 
 int xe_bo_vmap(struct xe_bo *bo)
 {
+	struct xe_device *xe = ttm_to_xe_device(bo->ttm.bdev);
 	void *virtual;
 	bool is_iomem;
 	int ret;
 
 	xe_bo_assert_held(bo);
 
-	if (!(bo->flags & XE_BO_FLAG_NEEDS_CPU_ACCESS))
+	if (drm_WARN_ON(&xe->drm, !(bo->flags & XE_BO_FLAG_NEEDS_CPU_ACCESS) ||
+			!force_contiguous(bo->flags)))
 		return -EINVAL;
 
 	if (!iosys_map_is_null(&bo->vmap))
-- 
2.34.1