X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fi915%2Fgt%2Fintel_migrate.c;h=5fb74e71f27b50bbc6dee99dfdd1a7716784fb8a;hb=952d19190c6d482ec725f22e8bc8646bc0189d41;hp=b783f6f740c8b980822aa6ac6aee40dbdac98177;hpb=31a2e6cbe8a4eb0d1650fff4b77872b744e14a62;p=linux-block.git

diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index b783f6f740c8..5fb74e71f27b 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -837,14 +837,35 @@ intel_context_migrate_copy(struct intel_context *ce,
 			if (err)
 				goto out_rq;
 
-			/*
-			 * While we can't always restore/manage the CCS state,
-			 * we still need to ensure we don't leak the CCS state
-			 * from the previous user, so make sure we overwrite it
-			 * with something.
-			 */
-			err = emit_copy_ccs(rq, dst_offset, INDIRECT_ACCESS,
-					    dst_offset, DIRECT_ACCESS, len);
+			if (src_is_lmem) {
+				/*
+				 * If the src is already in lmem, then we must
+				 * be doing an lmem -> lmem transfer, and so
+				 * should be safe to directly copy the CCS
+				 * state. In this case we have either
+				 * initialised the CCS aux state when first
+				 * clearing the pages (since it is already
+				 * allocated in lmem), or the user has
+				 * potentially populated it, in which case we
+				 * need to copy the CCS state as-is.
+				 */
+				err = emit_copy_ccs(rq,
+						    dst_offset, INDIRECT_ACCESS,
+						    src_offset, INDIRECT_ACCESS,
+						    len);
+			} else {
+				/*
+				 * While we can't always restore/manage the CCS
+				 * state, we still need to ensure we don't leak
+				 * the CCS state from the previous user, so make
+				 * sure we overwrite it with something.
+				 */
+				err = emit_copy_ccs(rq,
+						    dst_offset, INDIRECT_ACCESS,
+						    dst_offset, DIRECT_ACCESS,
+						    len);
+			}
+
 			if (err)
 				goto out_rq;