1 /* SPDX-License-Identifier: MIT */
2 /*
3 * Copyright © 2020 Intel Corporation
4 */
5 #ifndef __I915_GEM_WW_H__
6 #define __I915_GEM_WW_H__
7
8 #include <drm/drm_drv.h>
9
10 struct i915_gem_ww_ctx {
11 struct ww_acquire_ctx ctx;
12 struct list_head obj_list;
13 struct drm_i915_gem_object *contended;
14 unsigned short intr;
15 unsigned short loop;
16 };
17
18 void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
19 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
20 int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
21 void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
22
23 /* Internal functions used by the inlines! Don't use. */
__i915_gem_ww_fini(struct i915_gem_ww_ctx * ww,int err)24 static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
25 {
26 ww->loop = 0;
27 if (err == -EDEADLK) {
28 err = i915_gem_ww_ctx_backoff(ww);
29 if (!err)
30 ww->loop = 1;
31 }
32
33 if (!ww->loop)
34 i915_gem_ww_ctx_fini(ww);
35
36 return err;
37 }
38
39 static inline void
__i915_gem_ww_init(struct i915_gem_ww_ctx * ww,bool intr)40 __i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
41 {
42 i915_gem_ww_ctx_init(ww, intr);
43 ww->loop = 1;
44 }
45
46 #define for_i915_gem_ww(_ww, _err, _intr) \
47 for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop; \
48 _err = __i915_gem_ww_fini(_ww, _err))
49
50 #endif
51
