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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2020 Intel Corporation
*/
#ifndef __I915_GEM_WW_H__
#define __I915_GEM_WW_H__
#include <drm/drm_drv.h>
struct i915_gem_ww_ctx {
struct ww_acquire_ctx ctx;
struct list_head obj_list;
struct drm_i915_gem_object *contended;
unsigned short intr;
unsigned short loop;
};
void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ctx, bool intr);
void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ctx);
int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ctx);
void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj);
/* Internal functions used by the inlines! Don't use. */
static inline int __i915_gem_ww_fini(struct i915_gem_ww_ctx *ww, int err)
{
ww->loop = 0;
if (err == -EDEADLK) {
err = i915_gem_ww_ctx_backoff(ww);
if (!err)
ww->loop = 1;
}
if (!ww->loop)
i915_gem_ww_ctx_fini(ww);
return err;
}
static inline void
__i915_gem_ww_init(struct i915_gem_ww_ctx *ww, bool intr)
{
i915_gem_ww_ctx_init(ww, intr);
ww->loop = 1;
}
#define for_i915_gem_ww(_ww, _err, _intr) \
for (__i915_gem_ww_init(_ww, _intr); (_ww)->loop; \
_err = __i915_gem_ww_fini(_ww, _err))
#endif
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