Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 537 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
new file mode 100644
index 000000000..e55508b39
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -0,0 +1,537 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+/*
+ * Authors:
+ *    Christian König <christian.koenig@amd.com>
+ */
+
+/**
+ * DOC: MMU Notifier
+ *
+ * For coherent userptr handling registers an MMU notifier to inform the driver
+ * about updates on the page tables of a process.
+ *
+ * When somebody tries to invalidate the page tables we block the update until
+ * all operations on the pages in question are completed, then those pages are
+ * marked as accessed and also dirty if it wasn't a read only access.
+ *
+ * New command submissions using the userptrs in question are delayed until all
+ * page table invalidation are completed and we once more see a coherent process
+ * address space.
+ */
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/mmu_notifier.h>
+#include <linux/interval_tree.h>
+#include <drm/drmP.h>
+#include <drm/drm.h>
+
+#include "amdgpu.h"
+#include "amdgpu_amdkfd.h"
+
+/**
+ * struct amdgpu_mn
+ *
+ * @adev: amdgpu device pointer
+ * @mm: process address space
+ * @mn: MMU notifier structure
+ * @type: type of MMU notifier
+ * @work: destruction work item
+ * @node: hash table node to find structure by adev and mn
+ * @lock: rw semaphore protecting the notifier nodes
+ * @objects: interval tree containing amdgpu_mn_nodes
+ * @read_lock: mutex for recursive locking of @lock
+ * @recursion: depth of recursion
+ *
+ * Data for each amdgpu device and process address space.
+ */
+struct amdgpu_mn {
+	/* constant after initialisation */
+	struct amdgpu_device	*adev;
+	struct mm_struct	*mm;
+	struct mmu_notifier	mn;
+	enum amdgpu_mn_type	type;
+
+	/* only used on destruction */
+	struct work_struct	work;
+
+	/* protected by adev->mn_lock */
+	struct hlist_node	node;
+
+	/* objects protected by lock */
+	struct rw_semaphore	lock;
+	struct rb_root_cached	objects;
+	struct mutex		read_lock;
+	atomic_t		recursion;
+};
+
+/**
+ * struct amdgpu_mn_node
+ *
+ * @it: interval node defining start-last of the affected address range
+ * @bos: list of all BOs in the affected address range
+ *
+ * Manages all BOs which are affected of a certain range of address space.
+ */
+struct amdgpu_mn_node {
+	struct interval_tree_node	it;
+	struct list_head		bos;
+};
+
+/**
+ * amdgpu_mn_destroy - destroy the MMU notifier
+ *
+ * @work: previously sheduled work item
+ *
+ * Lazy destroys the notifier from a work item
+ */
+static void amdgpu_mn_destroy(struct work_struct *work)
+{
+	struct amdgpu_mn *amn = container_of(work, struct amdgpu_mn, work);
+	struct amdgpu_device *adev = amn->adev;
+	struct amdgpu_mn_node *node, *next_node;
+	struct amdgpu_bo *bo, *next_bo;
+
+	mutex_lock(&adev->mn_lock);
+	down_write(&amn->lock);
+	hash_del(&amn->node);
+	rbtree_postorder_for_each_entry_safe(node, next_node,
+					     &amn->objects.rb_root, it.rb) {
+		list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
+			bo->mn = NULL;
+			list_del_init(&bo->mn_list);
+		}
+		kfree(node);
+	}
+	up_write(&amn->lock);
+	mutex_unlock(&adev->mn_lock);
+	mmu_notifier_unregister_no_release(&amn->mn, amn->mm);
+	kfree(amn);
+}
+
+/**
+ * amdgpu_mn_release - callback to notify about mm destruction
+ *
+ * @mn: our notifier
+ * @mm: the mm this callback is about
+ *
+ * Shedule a work item to lazy destroy our notifier.
+ */
+static void amdgpu_mn_release(struct mmu_notifier *mn,
+			      struct mm_struct *mm)
+{
+	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+
+	INIT_WORK(&amn->work, amdgpu_mn_destroy);
+	schedule_work(&amn->work);
+}
+
+
+/**
+ * amdgpu_mn_lock - take the write side lock for this notifier
+ *
+ * @mn: our notifier
+ */
+void amdgpu_mn_lock(struct amdgpu_mn *mn)
+{
+	if (mn)
+		down_write(&mn->lock);
+}
+
+/**
+ * amdgpu_mn_unlock - drop the write side lock for this notifier
+ *
+ * @mn: our notifier
+ */
+void amdgpu_mn_unlock(struct amdgpu_mn *mn)
+{
+	if (mn)
+		up_write(&mn->lock);
+}
+
+/**
+ * amdgpu_mn_read_lock - take the read side lock for this notifier
+ *
+ * @amn: our notifier
+ */
+static int amdgpu_mn_read_lock(struct amdgpu_mn *amn, bool blockable)
+{
+	if (blockable)
+		mutex_lock(&amn->read_lock);
+	else if (!mutex_trylock(&amn->read_lock))
+		return -EAGAIN;
+
+	if (atomic_inc_return(&amn->recursion) == 1)
+		down_read_non_owner(&amn->lock);
+	mutex_unlock(&amn->read_lock);
+
+	return 0;
+}
+
+/**
+ * amdgpu_mn_read_unlock - drop the read side lock for this notifier
+ *
+ * @amn: our notifier
+ */
+static void amdgpu_mn_read_unlock(struct amdgpu_mn *amn)
+{
+	if (atomic_dec_return(&amn->recursion) == 0)
+		up_read_non_owner(&amn->lock);
+}
+
+/**
+ * amdgpu_mn_invalidate_node - unmap all BOs of a node
+ *
+ * @node: the node with the BOs to unmap
+ * @start: start of address range affected
+ * @end: end of address range affected
+ *
+ * Block for operations on BOs to finish and mark pages as accessed and
+ * potentially dirty.
+ */
+static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
+				      unsigned long start,
+				      unsigned long end)
+{
+	struct amdgpu_bo *bo;
+	long r;
+
+	list_for_each_entry(bo, &node->bos, mn_list) {
+
+		if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))
+			continue;
+
+		r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
+			true, false, MAX_SCHEDULE_TIMEOUT);
+		if (r <= 0)
+			DRM_ERROR("(%ld) failed to wait for user bo\n", r);
+
+		amdgpu_ttm_tt_mark_user_pages(bo->tbo.ttm);
+	}
+}
+
+/**
+ * amdgpu_mn_invalidate_range_start_gfx - callback to notify about mm change
+ *
+ * @mn: our notifier
+ * @mm: the mm this callback is about
+ * @start: start of updated range
+ * @end: end of updated range
+ *
+ * Block for operations on BOs to finish and mark pages as accessed and
+ * potentially dirty.
+ */
+static int amdgpu_mn_invalidate_range_start_gfx(struct mmu_notifier *mn,
+						 struct mm_struct *mm,
+						 unsigned long start,
+						 unsigned long end,
+						 bool blockable)
+{
+	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+	struct interval_tree_node *it;
+
+	/* notification is exclusive, but interval is inclusive */
+	end -= 1;
+
+	/* TODO we should be able to split locking for interval tree and
+	 * amdgpu_mn_invalidate_node
+	 */
+	if (amdgpu_mn_read_lock(amn, blockable))
+		return -EAGAIN;
+
+	it = interval_tree_iter_first(&amn->objects, start, end);
+	while (it) {
+		struct amdgpu_mn_node *node;
+
+		if (!blockable) {
+			amdgpu_mn_read_unlock(amn);
+			return -EAGAIN;
+		}
+
+		node = container_of(it, struct amdgpu_mn_node, it);
+		it = interval_tree_iter_next(it, start, end);
+
+		amdgpu_mn_invalidate_node(node, start, end);
+	}
+
+	return 0;
+}
+
+/**
+ * amdgpu_mn_invalidate_range_start_hsa - callback to notify about mm change
+ *
+ * @mn: our notifier
+ * @mm: the mm this callback is about
+ * @start: start of updated range
+ * @end: end of updated range
+ *
+ * We temporarily evict all BOs between start and end. This
+ * necessitates evicting all user-mode queues of the process. The BOs
+ * are restorted in amdgpu_mn_invalidate_range_end_hsa.
+ */
+static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
+						 struct mm_struct *mm,
+						 unsigned long start,
+						 unsigned long end,
+						 bool blockable)
+{
+	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+	struct interval_tree_node *it;
+
+	/* notification is exclusive, but interval is inclusive */
+	end -= 1;
+
+	if (amdgpu_mn_read_lock(amn, blockable))
+		return -EAGAIN;
+
+	it = interval_tree_iter_first(&amn->objects, start, end);
+	while (it) {
+		struct amdgpu_mn_node *node;
+		struct amdgpu_bo *bo;
+
+		if (!blockable) {
+			amdgpu_mn_read_unlock(amn);
+			return -EAGAIN;
+		}
+
+		node = container_of(it, struct amdgpu_mn_node, it);
+		it = interval_tree_iter_next(it, start, end);
+
+		list_for_each_entry(bo, &node->bos, mn_list) {
+			struct kgd_mem *mem = bo->kfd_bo;
+
+			if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm,
+							 start, end))
+				amdgpu_amdkfd_evict_userptr(mem, mm);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * amdgpu_mn_invalidate_range_end - callback to notify about mm change
+ *
+ * @mn: our notifier
+ * @mm: the mm this callback is about
+ * @start: start of updated range
+ * @end: end of updated range
+ *
+ * Release the lock again to allow new command submissions.
+ */
+static void amdgpu_mn_invalidate_range_end(struct mmu_notifier *mn,
+					   struct mm_struct *mm,
+					   unsigned long start,
+					   unsigned long end)
+{
+	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+
+	amdgpu_mn_read_unlock(amn);
+}
+
+static const struct mmu_notifier_ops amdgpu_mn_ops[] = {
+	[AMDGPU_MN_TYPE_GFX] = {
+		.release = amdgpu_mn_release,
+		.invalidate_range_start = amdgpu_mn_invalidate_range_start_gfx,
+		.invalidate_range_end = amdgpu_mn_invalidate_range_end,
+	},
+	[AMDGPU_MN_TYPE_HSA] = {
+		.release = amdgpu_mn_release,
+		.invalidate_range_start = amdgpu_mn_invalidate_range_start_hsa,
+		.invalidate_range_end = amdgpu_mn_invalidate_range_end,
+	},
+};
+
+/* Low bits of any reasonable mm pointer will be unused due to struct
+ * alignment. Use these bits to make a unique key from the mm pointer
+ * and notifier type.
+ */
+#define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
+
+/**
+ * amdgpu_mn_get - create notifier context
+ *
+ * @adev: amdgpu device pointer
+ * @type: type of MMU notifier context
+ *
+ * Creates a notifier context for current->mm.
+ */
+struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
+				enum amdgpu_mn_type type)
+{
+	struct mm_struct *mm = current->mm;
+	struct amdgpu_mn *amn;
+	unsigned long key = AMDGPU_MN_KEY(mm, type);
+	int r;
+
+	mutex_lock(&adev->mn_lock);
+	if (down_write_killable(&mm->mmap_sem)) {
+		mutex_unlock(&adev->mn_lock);
+		return ERR_PTR(-EINTR);
+	}
+
+	hash_for_each_possible(adev->mn_hash, amn, node, key)
+		if (AMDGPU_MN_KEY(amn->mm, amn->type) == key)
+			goto release_locks;
+
+	amn = kzalloc(sizeof(*amn), GFP_KERNEL);
+	if (!amn) {
+		amn = ERR_PTR(-ENOMEM);
+		goto release_locks;
+	}
+
+	amn->adev = adev;
+	amn->mm = mm;
+	init_rwsem(&amn->lock);
+	amn->type = type;
+	amn->mn.ops = &amdgpu_mn_ops[type];
+	amn->objects = RB_ROOT_CACHED;
+	mutex_init(&amn->read_lock);
+	atomic_set(&amn->recursion, 0);
+
+	r = __mmu_notifier_register(&amn->mn, mm);
+	if (r)
+		goto free_amn;
+
+	hash_add(adev->mn_hash, &amn->node, AMDGPU_MN_KEY(mm, type));
+
+release_locks:
+	up_write(&mm->mmap_sem);
+	mutex_unlock(&adev->mn_lock);
+
+	return amn;
+
+free_amn:
+	up_write(&mm->mmap_sem);
+	mutex_unlock(&adev->mn_lock);
+	kfree(amn);
+
+	return ERR_PTR(r);
+}
+
+/**
+ * amdgpu_mn_register - register a BO for notifier updates
+ *
+ * @bo: amdgpu buffer object
+ * @addr: userptr addr we should monitor
+ *
+ * Registers an MMU notifier for the given BO at the specified address.
+ * Returns 0 on success, -ERRNO if anything goes wrong.
+ */
+int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
+{
+	unsigned long end = addr + amdgpu_bo_size(bo) - 1;
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+	enum amdgpu_mn_type type =
+		bo->kfd_bo ? AMDGPU_MN_TYPE_HSA : AMDGPU_MN_TYPE_GFX;
+	struct amdgpu_mn *amn;
+	struct amdgpu_mn_node *node = NULL, *new_node;
+	struct list_head bos;
+	struct interval_tree_node *it;
+
+	amn = amdgpu_mn_get(adev, type);
+	if (IS_ERR(amn))
+		return PTR_ERR(amn);
+
+	new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
+	if (!new_node)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&bos);
+
+	down_write(&amn->lock);
+
+	while ((it = interval_tree_iter_first(&amn->objects, addr, end))) {
+		kfree(node);
+		node = container_of(it, struct amdgpu_mn_node, it);
+		interval_tree_remove(&node->it, &amn->objects);
+		addr = min(it->start, addr);
+		end = max(it->last, end);
+		list_splice(&node->bos, &bos);
+	}
+
+	if (!node)
+		node = new_node;
+	else
+		kfree(new_node);
+
+	bo->mn = amn;
+
+	node->it.start = addr;
+	node->it.last = end;
+	INIT_LIST_HEAD(&node->bos);
+	list_splice(&bos, &node->bos);
+	list_add(&bo->mn_list, &node->bos);
+
+	interval_tree_insert(&node->it, &amn->objects);
+
+	up_write(&amn->lock);
+
+	return 0;
+}
+
+/**
+ * amdgpu_mn_unregister - unregister a BO for notifier updates
+ *
+ * @bo: amdgpu buffer object
+ *
+ * Remove any registration of MMU notifier updates from the buffer object.
+ */
+void amdgpu_mn_unregister(struct amdgpu_bo *bo)
+{
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+	struct amdgpu_mn *amn;
+	struct list_head *head;
+
+	mutex_lock(&adev->mn_lock);
+
+	amn = bo->mn;
+	if (amn == NULL) {
+		mutex_unlock(&adev->mn_lock);
+		return;
+	}
+
+	down_write(&amn->lock);
+
+	/* save the next list entry for later */
+	head = bo->mn_list.next;
+
+	bo->mn = NULL;
+	list_del_init(&bo->mn_list);
+
+	if (list_empty(head)) {
+		struct amdgpu_mn_node *node;
+
+		node = container_of(head, struct amdgpu_mn_node, bos);
+		interval_tree_remove(&node->it, &amn->objects);
+		kfree(node);
+	}
+
+	up_write(&amn->lock);
+	mutex_unlock(&adev->mn_lock);
+}
+