cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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i915_gem_ww.h (1047B)

      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(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