338 lines
9.1 KiB
C
338 lines
9.1 KiB
C
/*
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* Copyright © 2017 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "display/intel_frontbuffer.h"
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#include "gt/intel_gt.h"
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#include "i915_drv.h"
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#include "i915_gem_clflush.h"
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#include "i915_gem_context.h"
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#include "i915_gem_object.h"
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#include "i915_globals.h"
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#include "i915_trace.h"
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static struct i915_global_object {
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struct i915_global base;
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struct kmem_cache *slab_objects;
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} global;
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struct drm_i915_gem_object *i915_gem_object_alloc(void)
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{
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return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
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}
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void i915_gem_object_free(struct drm_i915_gem_object *obj)
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{
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return kmem_cache_free(global.slab_objects, obj);
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}
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void i915_gem_object_init(struct drm_i915_gem_object *obj,
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const struct drm_i915_gem_object_ops *ops)
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{
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mutex_init(&obj->mm.lock);
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spin_lock_init(&obj->vma.lock);
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INIT_LIST_HEAD(&obj->vma.list);
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INIT_LIST_HEAD(&obj->mm.link);
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INIT_LIST_HEAD(&obj->lut_list);
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init_rcu_head(&obj->rcu);
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obj->ops = ops;
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obj->mm.madv = I915_MADV_WILLNEED;
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INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
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mutex_init(&obj->mm.get_page.lock);
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}
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/**
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* Mark up the object's coherency levels for a given cache_level
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* @obj: #drm_i915_gem_object
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* @cache_level: cache level
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*/
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void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
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unsigned int cache_level)
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{
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obj->cache_level = cache_level;
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if (cache_level != I915_CACHE_NONE)
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obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
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I915_BO_CACHE_COHERENT_FOR_WRITE);
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else if (HAS_LLC(to_i915(obj->base.dev)))
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obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
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else
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obj->cache_coherent = 0;
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obj->cache_dirty =
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!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
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}
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void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
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{
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struct drm_i915_gem_object *obj = to_intel_bo(gem);
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struct drm_i915_file_private *fpriv = file->driver_priv;
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struct i915_lut_handle *lut, *ln;
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LIST_HEAD(close);
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i915_gem_object_lock(obj);
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list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
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struct i915_gem_context *ctx = lut->ctx;
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if (ctx->file_priv != fpriv)
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continue;
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i915_gem_context_get(ctx);
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list_move(&lut->obj_link, &close);
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}
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i915_gem_object_unlock(obj);
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list_for_each_entry_safe(lut, ln, &close, obj_link) {
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struct i915_gem_context *ctx = lut->ctx;
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struct i915_vma *vma;
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/*
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* We allow the process to have multiple handles to the same
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* vma, in the same fd namespace, by virtue of flink/open.
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*/
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mutex_lock(&ctx->mutex);
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vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
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if (vma) {
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GEM_BUG_ON(vma->obj != obj);
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GEM_BUG_ON(!atomic_read(&vma->open_count));
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if (atomic_dec_and_test(&vma->open_count) &&
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!i915_vma_is_ggtt(vma))
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i915_vma_close(vma);
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}
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mutex_unlock(&ctx->mutex);
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i915_gem_context_put(lut->ctx);
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i915_lut_handle_free(lut);
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i915_gem_object_put(obj);
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}
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}
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static void __i915_gem_free_object_rcu(struct rcu_head *head)
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{
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struct drm_i915_gem_object *obj =
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container_of(head, typeof(*obj), rcu);
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struct drm_i915_private *i915 = to_i915(obj->base.dev);
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dma_resv_fini(&obj->base._resv);
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i915_gem_object_free(obj);
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GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
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atomic_dec(&i915->mm.free_count);
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}
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static void __i915_gem_free_objects(struct drm_i915_private *i915,
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struct llist_node *freed)
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{
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struct drm_i915_gem_object *obj, *on;
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intel_wakeref_t wakeref;
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wakeref = intel_runtime_pm_get(&i915->runtime_pm);
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llist_for_each_entry_safe(obj, on, freed, freed) {
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struct i915_vma *vma, *vn;
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trace_i915_gem_object_destroy(obj);
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mutex_lock(&i915->drm.struct_mutex);
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list_for_each_entry_safe(vma, vn, &obj->vma.list, obj_link) {
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GEM_BUG_ON(i915_vma_is_active(vma));
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vma->flags &= ~I915_VMA_PIN_MASK;
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i915_vma_destroy(vma);
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}
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GEM_BUG_ON(!list_empty(&obj->vma.list));
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GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma.tree));
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mutex_unlock(&i915->drm.struct_mutex);
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GEM_BUG_ON(atomic_read(&obj->bind_count));
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GEM_BUG_ON(obj->userfault_count);
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GEM_BUG_ON(!list_empty(&obj->lut_list));
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atomic_set(&obj->mm.pages_pin_count, 0);
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__i915_gem_object_put_pages(obj, I915_MM_NORMAL);
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GEM_BUG_ON(i915_gem_object_has_pages(obj));
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bitmap_free(obj->bit_17);
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if (obj->base.import_attach)
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drm_prime_gem_destroy(&obj->base, NULL);
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drm_gem_free_mmap_offset(&obj->base);
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if (obj->ops->release)
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obj->ops->release(obj);
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/* But keep the pointer alive for RCU-protected lookups */
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call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
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}
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intel_runtime_pm_put(&i915->runtime_pm, wakeref);
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}
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void i915_gem_flush_free_objects(struct drm_i915_private *i915)
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{
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struct llist_node *freed = llist_del_all(&i915->mm.free_list);
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if (unlikely(freed))
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__i915_gem_free_objects(i915, freed);
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}
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static void __i915_gem_free_work(struct work_struct *work)
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{
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struct drm_i915_private *i915 =
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container_of(work, struct drm_i915_private, mm.free_work);
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i915_gem_flush_free_objects(i915);
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}
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void i915_gem_free_object(struct drm_gem_object *gem_obj)
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{
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struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
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struct drm_i915_private *i915 = to_i915(obj->base.dev);
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GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));
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/*
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* Before we free the object, make sure any pure RCU-only
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* read-side critical sections are complete, e.g.
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* i915_gem_busy_ioctl(). For the corresponding synchronized
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* lookup see i915_gem_object_lookup_rcu().
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*/
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atomic_inc(&i915->mm.free_count);
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/*
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* This serializes freeing with the shrinker. Since the free
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* is delayed, first by RCU then by the workqueue, we want the
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* shrinker to be able to free pages of unreferenced objects,
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* or else we may oom whilst there are plenty of deferred
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* freed objects.
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*/
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i915_gem_object_make_unshrinkable(obj);
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/*
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* Since we require blocking on struct_mutex to unbind the freed
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* object from the GPU before releasing resources back to the
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* system, we can not do that directly from the RCU callback (which may
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* be a softirq context), but must instead then defer that work onto a
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* kthread. We use the RCU callback rather than move the freed object
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* directly onto the work queue so that we can mix between using the
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* worker and performing frees directly from subsequent allocations for
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* crude but effective memory throttling.
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*/
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if (llist_add(&obj->freed, &i915->mm.free_list))
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queue_work(i915->wq, &i915->mm.free_work);
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}
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static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
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{
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return !(obj->cache_level == I915_CACHE_NONE ||
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obj->cache_level == I915_CACHE_WT);
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}
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void
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i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
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unsigned int flush_domains)
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{
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struct i915_vma *vma;
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assert_object_held(obj);
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if (!(obj->write_domain & flush_domains))
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return;
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switch (obj->write_domain) {
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case I915_GEM_DOMAIN_GTT:
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for_each_ggtt_vma(vma, obj)
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intel_gt_flush_ggtt_writes(vma->vm->gt);
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intel_frontbuffer_flush(obj->frontbuffer, ORIGIN_CPU);
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for_each_ggtt_vma(vma, obj) {
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if (vma->iomap)
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continue;
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i915_vma_unset_ggtt_write(vma);
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}
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break;
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case I915_GEM_DOMAIN_WC:
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wmb();
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break;
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case I915_GEM_DOMAIN_CPU:
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i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
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break;
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case I915_GEM_DOMAIN_RENDER:
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if (gpu_write_needs_clflush(obj))
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obj->cache_dirty = true;
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break;
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}
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obj->write_domain = 0;
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}
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void i915_gem_init__objects(struct drm_i915_private *i915)
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{
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INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
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}
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static void i915_global_objects_shrink(void)
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{
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kmem_cache_shrink(global.slab_objects);
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}
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static void i915_global_objects_exit(void)
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{
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kmem_cache_destroy(global.slab_objects);
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}
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static struct i915_global_object global = { {
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.shrink = i915_global_objects_shrink,
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.exit = i915_global_objects_exit,
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} };
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int __init i915_global_objects_init(void)
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{
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global.slab_objects =
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KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
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if (!global.slab_objects)
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return -ENOMEM;
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i915_global_register(&global.base);
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return 0;
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}
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#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
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#include "selftests/huge_gem_object.c"
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#include "selftests/huge_pages.c"
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#include "selftests/i915_gem_object.c"
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#include "selftests/i915_gem_coherency.c"
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#endif
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