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 bool intr; 15 }; 16 17 void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr); 18 void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx); 19 int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx); 20 void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj); 21 22 /* Internal function used by the inlines! Don't use. */ __i915_gem_ww_fini(struct i915_gem_ww_ctx * ww,int err)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 #endif 42