[PATCH v4 5/8] drm/i915/gt: Optimize the migration loop

[Ramalingam C]

Move the static calculations out of the loop.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_migrate.c | 34 ++++++++++++-------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c b/drivers/gpu/drm/i915/gt/intel_migrate.c
index bbfea570c239..b6c5a0102bc2 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -663,6 +663,7 @@ intel_context_migrate_copy(struct intel_context *ce,
 			   struct i915_request **out)
 {
 	struct sgt_dma it_src = sg_sgt(src), it_dst = sg_sgt(dst);
+	u32 src_offset, dst_offset;
 	struct i915_request *rq;
 	int err;
 
@@ -671,8 +672,20 @@ intel_context_migrate_copy(struct intel_context *ce,
 
 	GEM_BUG_ON(ce->ring->size < SZ_64K);
 
+	src_offset = 0;
+	dst_offset = CHUNK_SZ;
+	if (HAS_64K_PAGES(ce->engine->i915)) {
+		GEM_BUG_ON(!src_is_lmem && !dst_is_lmem);
+
+		src_offset = 0;
+		dst_offset = 0;
+		if (src_is_lmem)
+			src_offset = CHUNK_SZ;
+		if (dst_is_lmem)
+			dst_offset = 2 * CHUNK_SZ;
+	}
+
 	do {
-		u32 src_offset, dst_offset;
 		int len;
 
 		rq = i915_request_create(ce);
@@ -700,19 +713,6 @@ intel_context_migrate_copy(struct intel_context *ce,
 		if (err)
 			goto out_rq;
 
-		src_offset = 0;
-		dst_offset = CHUNK_SZ;
-		if (HAS_64K_PAGES(ce->engine->i915)) {
-			GEM_BUG_ON(!src_is_lmem && !dst_is_lmem);
-
-			src_offset = 0;
-			dst_offset = 0;
-			if (src_is_lmem)
-				src_offset = CHUNK_SZ;
-			if (dst_is_lmem)
-				dst_offset = 2 * CHUNK_SZ;
-		}
-
 		len = emit_pte(rq, &it_src, src_cache_level, src_is_lmem,
 			       src_offset, CHUNK_SZ);
 		if (len <= 0) {
@@ -722,12 +722,10 @@ intel_context_migrate_copy(struct intel_context *ce,
 
 		err = emit_pte(rq, &it_dst, dst_cache_level, dst_is_lmem,
 			       dst_offset, len);
-		if (err < 0)
-			goto out_rq;
-		if (err < len) {
+		if (err < len)
 			err = -EINVAL;
+		if (err < 0)
 			goto out_rq;
-		}
 
 		err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
 		if (err)
-- 
2.20.1