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
10struct i915_gem_ww_ctx {
11 struct ww_acquire_ctx ctx;
12 struct list_head obj_list;
13 struct drm_i915_gem_object *contended;
14 bool intr;
15};
16
17void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
18void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
19int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
20void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
21
22/* Internal function used by the inlines! Don't use. */
23static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
24{
25 if (err == -EDEADLK) {
26 err = i915_gem_ww_ctx_backoff(ctx: ww);
27 if (!err)
28 err = -EDEADLK;
29 }
30
31 if (err != -EDEADLK)
32 i915_gem_ww_ctx_fini(ctx: ww);
33
34 return err;
35}
36
37#define for_i915_gem_ww(_ww, _err, _intr) \
38 for (i915_gem_ww_ctx_init(_ww, _intr), (_err) = -EDEADLK; \
39 (_err) == -EDEADLK; \
40 (_err) = __i915_gem_ww_fini(_ww, _err))
41#endif
42