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1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2025 Intel Corporation
4 */
5
6#ifndef _XE_USERPTR_H_
7#define _XE_USERPTR_H_
8
9#include <linux/list.h>
10#include <linux/mutex.h>
11#include <linux/notifier.h>
12#include <linux/scatterlist.h>
13#include <linux/spinlock.h>
14
15#include <drm/drm_gpusvm.h>
16
17struct xe_vm;
18struct xe_vma;
19struct xe_userptr_vma;
20
21/** struct xe_userptr_vm - User pointer VM level state */
22struct xe_userptr_vm {
23 /**
24 * @userptr.repin_list: list of VMAs which are user pointers,
25 * and needs repinning. Protected by @lock.
26 */
27 struct list_head repin_list;
28 /**
29 * @userptr.invalidated_lock: Protects the
30 * @userptr.invalidated list.
31 */
32 spinlock_t invalidated_lock;
33 /**
34 * @userptr.invalidated: List of invalidated userptrs, not yet
35 * picked
36 * up for revalidation. Protected from access with the
37 * @invalidated_lock. Removing items from the list
38 * additionally requires @lock in write mode, and adding
39 * items to the list requires either the @svm.gpusvm.notifier_lock in
40 * write mode, OR @lock in write mode.
41 */
42 struct list_head invalidated;
43};
44
45/** struct xe_userptr - User pointer */
46struct xe_userptr {
47 /** @invalidate_link: Link for the vm::userptr.invalidated list */
48 struct list_head invalidate_link;
49 /** @userptr: link into VM repin list if userptr. */
50 struct list_head repin_link;
51 /**
52 * @pages: gpusvm pages for this user pointer.
53 */
54 struct drm_gpusvm_pages pages;
55 /**
56 * @notifier: MMU notifier for user pointer (invalidation call back)
57 */
58 struct mmu_interval_notifier notifier;
59
60 /**
61 * @initial_bind: user pointer has been bound at least once.
62 * write: vm->svm.gpusvm.notifier_lock in read mode and vm->resv held.
63 * read: vm->svm.gpusvm.notifier_lock in write mode or vm->resv held.
64 */
65 bool initial_bind;
66#if IS_ENABLED(CONFIG_DRM_XE_USERPTR_INVAL_INJECT)
67 u32 divisor;
68#endif
69};
70
71#if IS_ENABLED(CONFIG_DRM_GPUSVM)
72void xe_userptr_remove(struct xe_userptr_vma *uvma);
73int xe_userptr_setup(struct xe_userptr_vma *uvma, unsigned long start,
74 unsigned long range);
75void xe_userptr_destroy(struct xe_userptr_vma *uvma);
76
77int xe_vm_userptr_pin(struct xe_vm *vm);
78int __xe_vm_userptr_needs_repin(struct xe_vm *vm);
79int xe_vm_userptr_check_repin(struct xe_vm *vm);
80int xe_vma_userptr_pin_pages(struct xe_userptr_vma *uvma);
81int xe_vma_userptr_check_repin(struct xe_userptr_vma *uvma);
82#else
83static inline void xe_userptr_remove(struct xe_userptr_vma *uvma) {}
84
85static inline int xe_userptr_setup(struct xe_userptr_vma *uvma,
86 unsigned long start, unsigned long range)
87{
88 return -ENODEV;
89}
90
91static inline void xe_userptr_destroy(struct xe_userptr_vma *uvma) {}
92
93static inline int xe_vm_userptr_pin(struct xe_vm *vm) { return 0; }
94static inline int __xe_vm_userptr_needs_repin(struct xe_vm *vm) { return 0; }
95static inline int xe_vm_userptr_check_repin(struct xe_vm *vm) { return 0; }
96static inline int xe_vma_userptr_pin_pages(struct xe_userptr_vma *uvma) { return -ENODEV; }
97static inline int xe_vma_userptr_check_repin(struct xe_userptr_vma *uvma) { return -ENODEV; };
98#endif
99
100#if IS_ENABLED(CONFIG_DRM_XE_USERPTR_INVAL_INJECT)
101void xe_vma_userptr_force_invalidate(struct xe_userptr_vma *uvma);
102#else
103static inline void xe_vma_userptr_force_invalidate(struct xe_userptr_vma *uvma)
104{
105}
106#endif
107#endif