64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
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// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2020 Intel Corporation
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*/
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#include <linux/dma-resv.h>
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#include "i915_gem_ww.h"
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#include "gem/i915_gem_object.h"
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void i915_gem_ww_ctx_init(struct i915_gem_ww_ctx *ww, bool intr)
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{
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ww_acquire_init(&ww->ctx, &reservation_ww_class);
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INIT_LIST_HEAD(&ww->obj_list);
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ww->intr = intr;
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ww->contended = NULL;
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}
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static void i915_gem_ww_ctx_unlock_all(struct i915_gem_ww_ctx *ww)
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{
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struct drm_i915_gem_object *obj;
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while ((obj = list_first_entry_or_null(&ww->obj_list, struct drm_i915_gem_object, obj_link))) {
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list_del(&obj->obj_link);
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i915_gem_object_unlock(obj);
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i915_gem_object_put(obj);
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}
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}
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void i915_gem_ww_unlock_single(struct drm_i915_gem_object *obj)
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{
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list_del(&obj->obj_link);
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i915_gem_object_unlock(obj);
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i915_gem_object_put(obj);
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}
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void i915_gem_ww_ctx_fini(struct i915_gem_ww_ctx *ww)
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{
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i915_gem_ww_ctx_unlock_all(ww);
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WARN_ON(ww->contended);
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ww_acquire_fini(&ww->ctx);
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}
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int __must_check i915_gem_ww_ctx_backoff(struct i915_gem_ww_ctx *ww)
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{
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int ret = 0;
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if (WARN_ON(!ww->contended))
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return -EINVAL;
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i915_gem_ww_ctx_unlock_all(ww);
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if (ww->intr)
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ret = dma_resv_lock_slow_interruptible(ww->contended->base.resv, &ww->ctx);
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else
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dma_resv_lock_slow(ww->contended->base.resv, &ww->ctx);
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if (!ret)
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list_add_tail(&ww->contended->obj_link, &ww->obj_list);
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else
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i915_gem_object_put(ww->contended);
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ww->contended = NULL;
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return ret;
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}
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