LXR linux/drivers/gpu/drm/i915/i915_gem

   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        unsigned short intr;
  15        unsigned short loop;
  16};
  17
  18void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
  19void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
  20int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
  21void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
  22
  23/* Internal functions used by the inlines! Don't use. */
  24static 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
  39static inline void
  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