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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