diff options
Diffstat (limited to 'drivers/vfio/pci/virtio/common.h')
| -rw-r--r-- | drivers/vfio/pci/virtio/common.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/vfio/pci/virtio/common.h b/drivers/vfio/pci/virtio/common.h new file mode 100644 index 000000000000..c7d7e27af386 --- /dev/null +++ b/drivers/vfio/pci/virtio/common.h @@ -0,0 +1,127 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef VIRTIO_VFIO_COMMON_H +#define VIRTIO_VFIO_COMMON_H + +#include <linux/kernel.h> +#include <linux/virtio.h> +#include <linux/vfio_pci_core.h> +#include <linux/virtio_pci.h> + +enum virtiovf_migf_state { + VIRTIOVF_MIGF_STATE_ERROR = 1, + VIRTIOVF_MIGF_STATE_PRECOPY = 2, + VIRTIOVF_MIGF_STATE_COMPLETE = 3, +}; + +enum virtiovf_load_state { + VIRTIOVF_LOAD_STATE_READ_HEADER, + VIRTIOVF_LOAD_STATE_PREP_HEADER_DATA, + VIRTIOVF_LOAD_STATE_READ_HEADER_DATA, + VIRTIOVF_LOAD_STATE_PREP_CHUNK, + VIRTIOVF_LOAD_STATE_READ_CHUNK, + VIRTIOVF_LOAD_STATE_LOAD_CHUNK, +}; + +struct virtiovf_data_buffer { + struct sg_append_table table; + loff_t start_pos; + u64 length; + u64 allocated_length; + struct list_head buf_elm; + u8 include_header_object:1; + struct virtiovf_migration_file *migf; + /* Optimize virtiovf_get_migration_page() for sequential access */ + struct scatterlist *last_offset_sg; + unsigned int sg_last_entry; + unsigned long last_offset; +}; + +enum virtiovf_migf_header_flags { + VIRTIOVF_MIGF_HEADER_FLAGS_TAG_MANDATORY = 0, + VIRTIOVF_MIGF_HEADER_FLAGS_TAG_OPTIONAL = 1 << 0, +}; + +enum virtiovf_migf_header_tag { + VIRTIOVF_MIGF_HEADER_TAG_DEVICE_DATA = 0, +}; + +struct virtiovf_migration_header { + __le64 record_size; + /* For future use in case we may need to change the kernel protocol */ + __le32 flags; /* Use virtiovf_migf_header_flags */ + __le32 tag; /* Use virtiovf_migf_header_tag */ + __u8 data[]; /* Its size is given in the record_size */ +}; + +struct virtiovf_migration_file { + struct file *filp; + /* synchronize access to the file state */ + struct mutex lock; + loff_t max_pos; + u64 pre_copy_initial_bytes; + struct ratelimit_state pre_copy_rl_state; + u64 record_size; + u32 record_tag; + u8 has_obj_id:1; + u32 obj_id; + enum virtiovf_migf_state state; + enum virtiovf_load_state load_state; + /* synchronize access to the lists */ + spinlock_t list_lock; + struct list_head buf_list; + struct list_head avail_list; + struct virtiovf_data_buffer *buf; + struct virtiovf_data_buffer *buf_header; + struct virtiovf_pci_core_device *virtvdev; +}; + +struct virtiovf_pci_core_device { + struct vfio_pci_core_device core_device; +#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY + u8 *bar0_virtual_buf; + /* synchronize access to the virtual buf */ + struct mutex bar_mutex; + void __iomem *notify_addr; + u64 notify_offset; + __le32 pci_base_addr_0; + __le16 pci_cmd; + u8 bar0_virtual_buf_size; + u8 notify_bar; +#endif + + /* LM related */ + u8 migrate_cap:1; + u8 deferred_reset:1; + /* protect migration state */ + struct mutex state_mutex; + enum vfio_device_mig_state mig_state; + /* protect the reset_done flow */ + spinlock_t reset_lock; + struct virtiovf_migration_file *resuming_migf; + struct virtiovf_migration_file *saving_migf; +}; + +void virtiovf_set_migratable(struct virtiovf_pci_core_device *virtvdev); +void virtiovf_open_migration(struct virtiovf_pci_core_device *virtvdev); +void virtiovf_close_migration(struct virtiovf_pci_core_device *virtvdev); +void virtiovf_migration_reset_done(struct pci_dev *pdev); + +#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY +int virtiovf_open_legacy_io(struct virtiovf_pci_core_device *virtvdev); +long virtiovf_vfio_pci_core_ioctl(struct vfio_device *core_vdev, + unsigned int cmd, unsigned long arg); +int virtiovf_pci_ioctl_get_region_info(struct vfio_device *core_vdev, + unsigned int cmd, unsigned long arg); +ssize_t virtiovf_pci_core_write(struct vfio_device *core_vdev, + const char __user *buf, size_t count, + loff_t *ppos); +ssize_t virtiovf_pci_core_read(struct vfio_device *core_vdev, char __user *buf, + size_t count, loff_t *ppos); +bool virtiovf_support_legacy_io(struct pci_dev *pdev); +int virtiovf_init_legacy_io(struct virtiovf_pci_core_device *virtvdev); +void virtiovf_release_legacy_io(struct virtiovf_pci_core_device *virtvdev); +void virtiovf_legacy_io_reset_done(struct pci_dev *pdev); +#endif + +#endif /* VIRTIO_VFIO_COMMON_H */ |