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