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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2020 Intel Corporation4 */5#include <linux/dma-resv.h>6#include "i915_gem_ww.h"7#include "gem/i915_gem_object.h"8 9void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)10{11	ww_acquire_init(&ww->ctx, &reservation_ww_class);12	INIT_LIST_HEAD(&ww->obj_list);13	ww->intr = intr;14	ww->contended = NULL;15}16 17static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)18{19	struct drm_i915_gem_object *obj;20 21	while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {22		list_del(&obj->obj_link);23		i915_gem_object_unlock(obj);24		i915_gem_object_put(obj);25	}26}27 28void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)29{30	list_del(&obj->obj_link);31	i915_gem_object_unlock(obj);32	i915_gem_object_put(obj);33}34 35void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)36{37	i915_gem_ww_ctx_unlock_all(ww);38	WARN_ON(ww->contended);39	ww_acquire_fini(&ww->ctx);40}41 42int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)43{44	int ret = 0;45 46	if (WARN_ON(!ww->contended))47		return -EINVAL;48 49	i915_gem_ww_ctx_unlock_all(ww);50	if (ww->intr)51		ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);52	else53		dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);54 55	if (!ret)56		list_add_tail(&ww->contended->obj_link, &ww->obj_list);57	else58		i915_gem_object_put(ww->contended);59 60	ww->contended = NULL;61 62	return ret;63}64