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path: root/drivers/gpu/drm/i915/i915_gem_userptr.c
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Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_userptr.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_userptr.c152
1 files changed, 74 insertions, 78 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 709efe2357ea..382a77a1097e 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -82,11 +82,11 @@ static void cancel_userptr(struct work_struct *work)
/* We are inside a kthread context and can't be interrupted */
if (i915_gem_object_unbind(obj) == 0)
__i915_gem_object_put_pages(obj, I915_MM_NORMAL);
- WARN_ONCE(obj->mm.pages,
- "Failed to release pages: bind_count=%d, pages_pin_count=%d, pin_display=%d\n",
+ WARN_ONCE(i915_gem_object_has_pages(obj),
+ "Failed to release pages: bind_count=%d, pages_pin_count=%d, pin_global=%d\n",
obj->bind_count,
atomic_read(&obj->mm.pages_pin_count),
- obj->pin_display);
+ obj->pin_global);
mutex_unlock(&obj->base.dev->struct_mutex);
@@ -164,7 +164,6 @@ static struct i915_mmu_notifier *
i915_mmu_notifier_create(struct mm_struct *mm)
{
struct i915_mmu_notifier *mn;
- int ret;
mn = kmalloc(sizeof(*mn), GFP_KERNEL);
if (mn == NULL)
@@ -173,20 +172,14 @@ i915_mmu_notifier_create(struct mm_struct *mm)
spin_lock_init(&mn->lock);
mn->mn.ops = &i915_gem_userptr_notifier;
mn->objects = RB_ROOT_CACHED;
- mn->wq = alloc_workqueue("i915-userptr-release", WQ_UNBOUND, 0);
+ mn->wq = alloc_workqueue("i915-userptr-release",
+ WQ_UNBOUND | WQ_MEM_RECLAIM,
+ 0);
if (mn->wq == NULL) {
kfree(mn);
return ERR_PTR(-ENOMEM);
}
- /* Protected by mmap_sem (write-lock) */
- ret = __mmu_notifier_register(&mn->mn, mm);
- if (ret) {
- destroy_workqueue(mn->wq);
- kfree(mn);
- return ERR_PTR(ret);
- }
-
return mn;
}
@@ -210,23 +203,42 @@ i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object *obj)
static struct i915_mmu_notifier *
i915_mmu_notifier_find(struct i915_mm_struct *mm)
{
- struct i915_mmu_notifier *mn = mm->mn;
+ struct i915_mmu_notifier *mn;
+ int err = 0;
mn = mm->mn;
if (mn)
return mn;
+ mn = i915_mmu_notifier_create(mm->mm);
+ if (IS_ERR(mn))
+ err = PTR_ERR(mn);
+
down_write(&mm->mm->mmap_sem);
mutex_lock(&mm->i915->mm_lock);
- if ((mn = mm->mn) == NULL) {
- mn = i915_mmu_notifier_create(mm->mm);
- if (!IS_ERR(mn))
- mm->mn = mn;
+ if (mm->mn == NULL && !err) {
+ /* Protected by mmap_sem (write-lock) */
+ err = __mmu_notifier_register(&mn->mn, mm->mm);
+ if (!err) {
+ /* Protected by mm_lock */
+ mm->mn = fetch_and_zero(&mn);
+ }
+ } else if (mm->mn) {
+ /*
+ * Someone else raced and successfully installed the mmu
+ * notifier, we can cancel our own errors.
+ */
+ err = 0;
}
mutex_unlock(&mm->i915->mm_lock);
up_write(&mm->mm->mmap_sem);
- return mn;
+ if (mn && !IS_ERR(mn)) {
+ destroy_workqueue(mn->wq);
+ kfree(mn);
+ }
+
+ return err ? ERR_PTR(err) : mm->mn;
}
static int
@@ -399,64 +411,47 @@ struct get_pages_work {
struct task_struct *task;
};
-#if IS_ENABLED(CONFIG_SWIOTLB)
-#define swiotlb_active() swiotlb_nr_tbl()
-#else
-#define swiotlb_active() 0
-#endif
-
-static int
-st_set_pages(struct sg_table **st, struct page **pvec, int num_pages)
-{
- struct scatterlist *sg;
- int ret, n;
-
- *st = kmalloc(sizeof(**st), GFP_KERNEL);
- if (*st == NULL)
- return -ENOMEM;
-
- if (swiotlb_active()) {
- ret = sg_alloc_table(*st, num_pages, GFP_KERNEL);
- if (ret)
- goto err;
-
- for_each_sg((*st)->sgl, sg, num_pages, n)
- sg_set_page(sg, pvec[n], PAGE_SIZE, 0);
- } else {
- ret = sg_alloc_table_from_pages(*st, pvec, num_pages,
- 0, num_pages << PAGE_SHIFT,
- GFP_KERNEL);
- if (ret)
- goto err;
- }
-
- return 0;
-
-err:
- kfree(*st);
- *st = NULL;
- return ret;
-}
-
static struct sg_table *
-__i915_gem_userptr_set_pages(struct drm_i915_gem_object *obj,
- struct page **pvec, int num_pages)
+__i915_gem_userptr_alloc_pages(struct drm_i915_gem_object *obj,
+ struct page **pvec, int num_pages)
{
- struct sg_table *pages;
+ unsigned int max_segment = i915_sg_segment_size();
+ struct sg_table *st;
+ unsigned int sg_page_sizes;
int ret;
- ret = st_set_pages(&pages, pvec, num_pages);
- if (ret)
+ st = kmalloc(sizeof(*st), GFP_KERNEL);
+ if (!st)
+ return ERR_PTR(-ENOMEM);
+
+alloc_table:
+ ret = __sg_alloc_table_from_pages(st, pvec, num_pages,
+ 0, num_pages << PAGE_SHIFT,
+ max_segment,
+ GFP_KERNEL);
+ if (ret) {
+ kfree(st);
return ERR_PTR(ret);
+ }
- ret = i915_gem_gtt_prepare_pages(obj, pages);
+ ret = i915_gem_gtt_prepare_pages(obj, st);
if (ret) {
- sg_free_table(pages);
- kfree(pages);
+ sg_free_table(st);
+
+ if (max_segment > PAGE_SIZE) {
+ max_segment = PAGE_SIZE;
+ goto alloc_table;
+ }
+
+ kfree(st);
return ERR_PTR(ret);
}
- return pages;
+ sg_page_sizes = i915_sg_page_sizes(st->sgl);
+
+ __i915_gem_object_set_pages(obj, st, sg_page_sizes);
+
+ return st;
}
static int
@@ -540,9 +535,9 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
struct sg_table *pages = ERR_PTR(ret);
if (pinned == npages) {
- pages = __i915_gem_userptr_set_pages(obj, pvec, npages);
+ pages = __i915_gem_userptr_alloc_pages(obj, pvec,
+ npages);
if (!IS_ERR(pages)) {
- __i915_gem_object_set_pages(obj, pages);
pinned = 0;
pages = NULL;
}
@@ -554,7 +549,7 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
}
mutex_unlock(&obj->mm.lock);
- release_pages(pvec, pinned, 0);
+ release_pages(pvec, pinned);
kvfree(pvec);
i915_gem_object_put(obj);
@@ -603,8 +598,7 @@ __i915_gem_userptr_get_pages_schedule(struct drm_i915_gem_object *obj)
return ERR_PTR(-EAGAIN);
}
-static struct sg_table *
-i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
+static int i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
{
const int num_pages = obj->base.size >> PAGE_SHIFT;
struct mm_struct *mm = obj->userptr.mm->mm;
@@ -633,9 +627,9 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
if (obj->userptr.work) {
/* active flag should still be held for the pending work */
if (IS_ERR(obj->userptr.work))
- return ERR_CAST(obj->userptr.work);
+ return PTR_ERR(obj->userptr.work);
else
- return ERR_PTR(-EAGAIN);
+ return -EAGAIN;
}
pvec = NULL;
@@ -661,17 +655,17 @@ i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj)
pages = __i915_gem_userptr_get_pages_schedule(obj);
active = pages == ERR_PTR(-EAGAIN);
} else {
- pages = __i915_gem_userptr_set_pages(obj, pvec, num_pages);
+ pages = __i915_gem_userptr_alloc_pages(obj, pvec, num_pages);
active = !IS_ERR(pages);
}
if (active)
__i915_gem_userptr_set_active(obj, true);
if (IS_ERR(pages))
- release_pages(pvec, pinned, 0);
+ release_pages(pvec, pinned);
kvfree(pvec);
- return pages;
+ return PTR_ERR_OR_ZERO(pages);
}
static void
@@ -834,7 +828,9 @@ int i915_gem_init_userptr(struct drm_i915_private *dev_priv)
hash_init(dev_priv->mm_structs);
dev_priv->mm.userptr_wq =
- alloc_workqueue("i915-userptr-acquire", WQ_HIGHPRI, 0);
+ alloc_workqueue("i915-userptr-acquire",
+ WQ_HIGHPRI | WQ_UNBOUND,
+ 0);
if (!dev_priv->mm.userptr_wq)
return -ENOMEM;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.