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1/* SPDX-License-Identifier: MIT */2/*3 * Copyright © 2020 Intel Corporation4 */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(ww);27 if (!err)28 err = -EDEADLK;29 }30 31 if (err != -EDEADLK)32 i915_gem_ww_ctx_fini(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#endif42