blob: 00d24000b5e8cddfceee8633f21840df0d167741 [file] [log] [blame]
/*
* Copyright © 2017 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <linux/sched/mm.h>
#include "display/intel_frontbuffer.h"
#include "gt/intel_gt.h"
#include "i915_drv.h"
#include "i915_gem_clflush.h"
#include "i915_gem_context.h"
#include "i915_gem_mman.h"
#include "i915_gem_object.h"
#include "i915_globals.h"
#include "i915_trace.h"
static struct i915_global_object {
struct i915_global base;
struct kmem_cache *slab_objects;
} global;
static const struct drm_gem_object_funcs i915_gem_object_funcs;
struct drm_i915_gem_object *i915_gem_object_alloc(void)
{
struct drm_i915_gem_object *obj;
obj = kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
if (!obj)
return NULL;
obj->base.funcs = &i915_gem_object_funcs;
return obj;
}
void i915_gem_object_free(struct drm_i915_gem_object *obj)
{
return kmem_cache_free(global.slab_objects, obj);
}
void i915_gem_object_init(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_object_ops *ops,
struct lock_class_key *key)
{
__mutex_init(&obj->mm.lock, ops->name ?: "obj->mm.lock", key);
spin_lock_init(&obj->vma.lock);
INIT_LIST_HEAD(&obj->vma.list);
INIT_LIST_HEAD(&obj->mm.link);
INIT_LIST_HEAD(&obj->lut_list);
spin_lock_init(&obj->lut_lock);
spin_lock_init(&obj->mmo.lock);
obj->mmo.offsets = RB_ROOT;
init_rcu_head(&obj->rcu);
obj->ops = ops;
obj->mm.madv = I915_MADV_WILLNEED;
INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
mutex_init(&obj->mm.get_page.lock);
INIT_RADIX_TREE(&obj->mm.get_dma_page.radix, GFP_KERNEL | __GFP_NOWARN);
mutex_init(&obj->mm.get_dma_page.lock);
if (IS_ENABLED(CONFIG_LOCKDEP) && i915_gem_object_is_shrinkable(obj))
i915_gem_shrinker_taints_mutex(to_i915(obj->base.dev),
&obj->mm.lock);
}
/**
* Mark up the object's coherency levels for a given cache_level
* @obj: #drm_i915_gem_object
* @cache_level: cache level
*/
void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
unsigned int cache_level)
{
obj->cache_level = cache_level;
if (cache_level != I915_CACHE_NONE)
obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
I915_BO_CACHE_COHERENT_FOR_WRITE);
else if (HAS_LLC(to_i915(obj->base.dev)))
obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
else
obj->cache_coherent = 0;
obj->cache_dirty =
!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
}
static void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
{
struct drm_i915_gem_object *obj = to_intel_bo(gem);
struct drm_i915_file_private *fpriv = file->driver_priv;
struct i915_lut_handle bookmark = {};
struct i915_mmap_offset *mmo, *mn;
struct i915_lut_handle *lut, *ln;
LIST_HEAD(close);
spin_lock(&obj->lut_lock);
list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
struct i915_gem_context *ctx = lut->ctx;
if (ctx && ctx->file_priv == fpriv) {
i915_gem_context_get(ctx);
list_move(&lut->obj_link, &close);
}
/* Break long locks, and carefully continue on from this spot */
if (&ln->obj_link != &obj->lut_list) {
list_add_tail(&bookmark.obj_link, &ln->obj_link);
if (cond_resched_lock(&obj->lut_lock))
list_safe_reset_next(&bookmark, ln, obj_link);
__list_del_entry(&bookmark.obj_link);
}
}
spin_unlock(&obj->lut_lock);
spin_lock(&obj->mmo.lock);
rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset)
drm_vma_node_revoke(&mmo->vma_node, file);
spin_unlock(&obj->mmo.lock);
list_for_each_entry_safe(lut, ln, &close, obj_link) {
struct i915_gem_context *ctx = lut->ctx;
struct i915_vma *vma;
/*
* We allow the process to have multiple handles to the same
* vma, in the same fd namespace, by virtue of flink/open.
*/
mutex_lock(&ctx->lut_mutex);
vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
if (vma) {
GEM_BUG_ON(vma->obj != obj);
GEM_BUG_ON(!atomic_read(&vma->open_count));
i915_vma_close(vma);
}
mutex_unlock(&ctx->lut_mutex);
i915_gem_context_put(lut->ctx);
i915_lut_handle_free(lut);
i915_gem_object_put(obj);
}
}
static void __i915_gem_free_object_rcu(struct rcu_head *head)
{
struct drm_i915_gem_object *obj =
container_of(head, typeof(*obj), rcu);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
dma_resv_fini(&obj->base._resv);
i915_gem_object_free(obj);
GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
atomic_dec(&i915->mm.free_count);
}
static void __i915_gem_object_free_mmaps(struct drm_i915_gem_object *obj)
{
/* Skip serialisation and waking the device if known to be not used. */
if (obj->userfault_count)
i915_gem_object_release_mmap_gtt(obj);
if (!RB_EMPTY_ROOT(&obj->mmo.offsets)) {
struct i915_mmap_offset *mmo, *mn;
i915_gem_object_release_mmap_offset(obj);
rbtree_postorder_for_each_entry_safe(mmo, mn,
&obj->mmo.offsets,
offset) {
drm_vma_offset_remove(obj->base.dev->vma_offset_manager,
&mmo->vma_node);
kfree(mmo);
}
obj->mmo.offsets = RB_ROOT;
}
}
static void __i915_gem_free_objects(struct drm_i915_private *i915,
struct llist_node *freed)
{
struct drm_i915_gem_object *obj, *on;
llist_for_each_entry_safe(obj, on, freed, freed) {
trace_i915_gem_object_destroy(obj);
if (!list_empty(&obj->vma.list)) {
struct i915_vma *vma;
/*
* Note that the vma keeps an object reference while
* it is active, so it *should* not sleep while we
* destroy it. Our debug code errs insits it *might*.
* For the moment, play along.
*/
spin_lock(&obj->vma.lock);
while ((vma = list_first_entry_or_null(&obj->vma.list,
struct i915_vma,
obj_link))) {
GEM_BUG_ON(vma->obj != obj);
spin_unlock(&obj->vma.lock);
__i915_vma_put(vma);
spin_lock(&obj->vma.lock);
}
spin_unlock(&obj->vma.lock);
}
__i915_gem_object_free_mmaps(obj);
GEM_BUG_ON(!list_empty(&obj->lut_list));
atomic_set(&obj->mm.pages_pin_count, 0);
__i915_gem_object_put_pages(obj);
GEM_BUG_ON(i915_gem_object_has_pages(obj));
bitmap_free(obj->bit_17);
if (obj->base.import_attach)
drm_prime_gem_destroy(&obj->base, NULL);
drm_gem_free_mmap_offset(&obj->base);
if (obj->ops->release)
obj->ops->release(obj);
/* But keep the pointer alive for RCU-protected lookups */
call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
cond_resched();
}
}
void i915_gem_flush_free_objects(struct drm_i915_private *i915)
{
struct llist_node *freed = llist_del_all(&i915->mm.free_list);
if (unlikely(freed))
__i915_gem_free_objects(i915, freed);
}
static void __i915_gem_free_work(struct work_struct *work)
{
struct drm_i915_private *i915 =
container_of(work, struct drm_i915_private, mm.free_work);
i915_gem_flush_free_objects(i915);
}
static void i915_gem_free_object(struct drm_gem_object *gem_obj)
{
struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
struct drm_i915_private *i915 = to_i915(obj->base.dev);
GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));
/*
* Before we free the object, make sure any pure RCU-only
* read-side critical sections are complete, e.g.
* i915_gem_busy_ioctl(). For the corresponding synchronized
* lookup see i915_gem_object_lookup_rcu().
*/
atomic_inc(&i915->mm.free_count);
/*
* This serializes freeing with the shrinker. Since the free
* is delayed, first by RCU then by the workqueue, we want the
* shrinker to be able to free pages of unreferenced objects,
* or else we may oom whilst there are plenty of deferred
* freed objects.
*/
i915_gem_object_make_unshrinkable(obj);
/*
* Since we require blocking on struct_mutex to unbind the freed
* object from the GPU before releasing resources back to the
* system, we can not do that directly from the RCU callback (which may
* be a softirq context), but must instead then defer that work onto a
* kthread. We use the RCU callback rather than move the freed object
* directly onto the work queue so that we can mix between using the
* worker and performing frees directly from subsequent allocations for
* crude but effective memory throttling.
*/
if (llist_add(&obj->freed, &i915->mm.free_list))
queue_work(i915->wq, &i915->mm.free_work);
}
static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
{
return !(obj->cache_level == I915_CACHE_NONE ||
obj->cache_level == I915_CACHE_WT);
}
void
i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
unsigned int flush_domains)
{
struct i915_vma *vma;
assert_object_held(obj);
if (!(obj->write_domain & flush_domains))
return;
switch (obj->write_domain) {
case I915_GEM_DOMAIN_GTT:
spin_lock(&obj->vma.lock);
for_each_ggtt_vma(vma, obj) {
if (i915_vma_unset_ggtt_write(vma))
intel_gt_flush_ggtt_writes(vma->vm->gt);
}
spin_unlock(&obj->vma.lock);
i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
break;
case I915_GEM_DOMAIN_WC:
wmb();
break;
case I915_GEM_DOMAIN_CPU:
i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
break;
case I915_GEM_DOMAIN_RENDER:
if (gpu_write_needs_clflush(obj))
obj->cache_dirty = true;
break;
}
obj->write_domain = 0;
}
void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
struct intel_frontbuffer *front;
front = __intel_frontbuffer_get(obj);
if (front) {
intel_frontbuffer_flush(front, origin);
intel_frontbuffer_put(front);
}
}
void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
struct intel_frontbuffer *front;
front = __intel_frontbuffer_get(obj);
if (front) {
intel_frontbuffer_invalidate(front, origin);
intel_frontbuffer_put(front);
}
}
void i915_gem_init__objects(struct drm_i915_private *i915)
{
INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
}
static void i915_global_objects_shrink(void)
{
kmem_cache_shrink(global.slab_objects);
}
static void i915_global_objects_exit(void)
{
kmem_cache_destroy(global.slab_objects);
}
static struct i915_global_object global = { {
.shrink = i915_global_objects_shrink,
.exit = i915_global_objects_exit,
} };
int __init i915_global_objects_init(void)
{
global.slab_objects =
KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
if (!global.slab_objects)
return -ENOMEM;
i915_global_register(&global.base);
return 0;
}
static const struct drm_gem_object_funcs i915_gem_object_funcs = {
.free = i915_gem_free_object,
.close = i915_gem_close_object,
.export = i915_gem_prime_export,
};
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/huge_gem_object.c"
#include "selftests/huge_pages.c"
#include "selftests/i915_gem_object.c"
#include "selftests/i915_gem_coherency.c"
#endif