[Intel-gfx] [PATCH] drm/i915/ttm: Return some errors instead of trying memcpy move

[Thomas Hellström]

The i915_ttm_accel_move() function may return error codes that should
be propagated further up the stack rather than consumed assuming that
the accel move failed and could be replaced with a memcpy move.

For -EINTR, -ERESTARTSYS and -EAGAIN, just propagate those codes, rather
than retrying with a memcpy move.

Fixes: 2b0a750caf33 ("drm/i915/ttm: Failsafe migration blits")
Cc: Matthew Auld <matthew.a...@intel.com>
Signed-off-by: Thomas Hellström <thomas.hellst...@linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c 
b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index 1de306c03aaf..1ebe6e4086a1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -436,11 +436,17 @@ __i915_ttm_move(struct ttm_buffer_object *bo,
 
                if (!IS_ERR(fence))
                        goto out;
-       } else if (move_deps) {
-               int err = i915_deps_sync(move_deps, ctx);
+       } else {
+               int err = PTR_ERR(fence);
+
+               if (err == -EINTR || err == -ERESTARTSYS || err == -EAGAIN)
+                       return fence;
 
-               if (err)
-                       return ERR_PTR(err);
+               if (move_deps) {
+                       err = i915_deps_sync(move_deps, ctx);
+                       if (err)
+                               return ERR_PTR(err);
+               }
        }
 
        /* Error intercept failed or no accelerated migration to start with */
-- 
2.34.1