[PATCH v3 5/6] drm/i915/gt: Optimize the migration loop

[Ramalingam C]

Move the static calculations out of the loop.

Signed-off-by: Ramalingam C <ramalinga...@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 05262f1b438e..24e0e73e4a90 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -556,6 +556,7 @@ 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;
 
@@ -564,8 +565,20 @@ 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);
@@ -593,19 +606,6 @@ 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) {
@@ -615,12 +615,10 @@ 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