]> Git Repo - J-linux.git/blob - drivers/vfio/pci/virtio/common.h
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / vfio / pci / virtio / common.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef VIRTIO_VFIO_COMMON_H
4 #define VIRTIO_VFIO_COMMON_H
5
6 #include <linux/kernel.h>
7 #include <linux/virtio.h>
8 #include <linux/vfio_pci_core.h>
9 #include <linux/virtio_pci.h>
10
11 enum virtiovf_migf_state {
12         VIRTIOVF_MIGF_STATE_ERROR = 1,
13         VIRTIOVF_MIGF_STATE_PRECOPY = 2,
14         VIRTIOVF_MIGF_STATE_COMPLETE = 3,
15 };
16
17 enum virtiovf_load_state {
18         VIRTIOVF_LOAD_STATE_READ_HEADER,
19         VIRTIOVF_LOAD_STATE_PREP_HEADER_DATA,
20         VIRTIOVF_LOAD_STATE_READ_HEADER_DATA,
21         VIRTIOVF_LOAD_STATE_PREP_CHUNK,
22         VIRTIOVF_LOAD_STATE_READ_CHUNK,
23         VIRTIOVF_LOAD_STATE_LOAD_CHUNK,
24 };
25
26 struct virtiovf_data_buffer {
27         struct sg_append_table table;
28         loff_t start_pos;
29         u64 length;
30         u64 allocated_length;
31         struct list_head buf_elm;
32         u8 include_header_object:1;
33         struct virtiovf_migration_file *migf;
34         /* Optimize virtiovf_get_migration_page() for sequential access */
35         struct scatterlist *last_offset_sg;
36         unsigned int sg_last_entry;
37         unsigned long last_offset;
38 };
39
40 enum virtiovf_migf_header_flags {
41         VIRTIOVF_MIGF_HEADER_FLAGS_TAG_MANDATORY = 0,
42         VIRTIOVF_MIGF_HEADER_FLAGS_TAG_OPTIONAL = 1 << 0,
43 };
44
45 enum virtiovf_migf_header_tag {
46         VIRTIOVF_MIGF_HEADER_TAG_DEVICE_DATA = 0,
47 };
48
49 struct virtiovf_migration_header {
50         __le64 record_size;
51         /* For future use in case we may need to change the kernel protocol */
52         __le32 flags; /* Use virtiovf_migf_header_flags */
53         __le32 tag; /* Use virtiovf_migf_header_tag */
54         __u8 data[]; /* Its size is given in the record_size */
55 };
56
57 struct virtiovf_migration_file {
58         struct file *filp;
59         /* synchronize access to the file state */
60         struct mutex lock;
61         loff_t max_pos;
62         u64 pre_copy_initial_bytes;
63         struct ratelimit_state pre_copy_rl_state;
64         u64 record_size;
65         u32 record_tag;
66         u8 has_obj_id:1;
67         u32 obj_id;
68         enum virtiovf_migf_state state;
69         enum virtiovf_load_state load_state;
70         /* synchronize access to the lists */
71         spinlock_t list_lock;
72         struct list_head buf_list;
73         struct list_head avail_list;
74         struct virtiovf_data_buffer *buf;
75         struct virtiovf_data_buffer *buf_header;
76         struct virtiovf_pci_core_device *virtvdev;
77 };
78
79 struct virtiovf_pci_core_device {
80         struct vfio_pci_core_device core_device;
81 #ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
82         u8 *bar0_virtual_buf;
83         /* synchronize access to the virtual buf */
84         struct mutex bar_mutex;
85         void __iomem *notify_addr;
86         u64 notify_offset;
87         __le32 pci_base_addr_0;
88         __le16 pci_cmd;
89         u8 bar0_virtual_buf_size;
90         u8 notify_bar;
91 #endif
92
93         /* LM related */
94         u8 migrate_cap:1;
95         u8 deferred_reset:1;
96         /* protect migration state */
97         struct mutex state_mutex;
98         enum vfio_device_mig_state mig_state;
99         /* protect the reset_done flow */
100         spinlock_t reset_lock;
101         struct virtiovf_migration_file *resuming_migf;
102         struct virtiovf_migration_file *saving_migf;
103 };
104
105 void virtiovf_set_migratable(struct virtiovf_pci_core_device *virtvdev);
106 void virtiovf_open_migration(struct virtiovf_pci_core_device *virtvdev);
107 void virtiovf_close_migration(struct virtiovf_pci_core_device *virtvdev);
108 void virtiovf_migration_reset_done(struct pci_dev *pdev);
109
110 #ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
111 int virtiovf_open_legacy_io(struct virtiovf_pci_core_device *virtvdev);
112 long virtiovf_vfio_pci_core_ioctl(struct vfio_device *core_vdev,
113                                   unsigned int cmd, unsigned long arg);
114 int virtiovf_pci_ioctl_get_region_info(struct vfio_device *core_vdev,
115                                        unsigned int cmd, unsigned long arg);
116 ssize_t virtiovf_pci_core_write(struct vfio_device *core_vdev,
117                                 const char __user *buf, size_t count,
118                                 loff_t *ppos);
119 ssize_t virtiovf_pci_core_read(struct vfio_device *core_vdev, char __user *buf,
120                                size_t count, loff_t *ppos);
121 bool virtiovf_support_legacy_io(struct pci_dev *pdev);
122 int virtiovf_init_legacy_io(struct virtiovf_pci_core_device *virtvdev);
123 void virtiovf_release_legacy_io(struct virtiovf_pci_core_device *virtvdev);
124 void virtiovf_legacy_io_reset_done(struct pci_dev *pdev);
125 #endif
126
127 #endif /* VIRTIO_VFIO_COMMON_H */
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