10b59a9b4a
Tested on Qemu/KVM, VirtualBox, and BHyVe. Currently built as modules-only on i386/amd64. Man pages not yet hooked up, pending review. Submitted by: Bryan Venteicher bryanv at daemoninthecloset dot org Reviewed by: bz MFC after: 4 weeks or so
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_H_
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#define _VIRTIO_H_
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#include <sys/types.h>
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struct vq_alloc_info;
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/* VirtIO device IDs. */
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#define VIRTIO_ID_NETWORK 0x01
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#define VIRTIO_ID_BLOCK 0x02
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#define VIRTIO_ID_CONSOLE 0x03
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#define VIRTIO_ID_ENTROPY 0x04
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#define VIRTIO_ID_BALLOON 0x05
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#define VIRTIO_ID_IOMEMORY 0x06
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#define VIRTIO_ID_9P 0x09
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/* Status byte for guest to report progress. */
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#define VIRTIO_CONFIG_STATUS_RESET 0x00
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#define VIRTIO_CONFIG_STATUS_ACK 0x01
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#define VIRTIO_CONFIG_STATUS_DRIVER 0x02
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#define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
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#define VIRTIO_CONFIG_STATUS_FAILED 0x80
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/*
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* Generate interrupt when the virtqueue ring is
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* completely used, even if we've suppressed them.
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*/
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#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
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/*
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* The guest should never negotiate this feature; it
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* is used to detect faulty drivers.
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*/
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#define VIRTIO_F_BAD_FEATURE (1 << 30)
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/*
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* Some VirtIO feature bits (currently bits 28 through 31) are
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* reserved for the transport being used (eg. virtio_ring), the
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* rest are per-device feature bits.
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*/
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#define VIRTIO_TRANSPORT_F_START 28
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#define VIRTIO_TRANSPORT_F_END 32
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/*
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* Maximum number of virtqueues per device.
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*/
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#define VIRTIO_MAX_VIRTQUEUES 8
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/*
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* Each virtqueue indirect descriptor list must be physically contiguous.
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* To allow us to malloc(9) each list individually, limit the number
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* supported to what will fit in one page. With 4KB pages, this is a limit
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* of 256 descriptors. If there is ever a need for more, we can switch to
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* contigmalloc(9) for the larger allocations, similar to what
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* bus_dmamem_alloc(9) does.
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*
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* Note the sizeof(struct vring_desc) is 16 bytes.
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*/
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#define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
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/*
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* VirtIO instance variables indices.
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*/
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#define VIRTIO_IVAR_DEVTYPE 1
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#define VIRTIO_IVAR_FEATURE_DESC 2
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struct virtio_feature_desc {
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uint64_t vfd_val;
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char *vfd_str;
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};
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const char *virtio_device_name(uint16_t devid);
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int virtio_get_device_type(device_t dev);
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void virtio_set_feature_desc(device_t dev,
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struct virtio_feature_desc *feature_desc);
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void virtio_describe(device_t dev, const char *msg,
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uint64_t features, struct virtio_feature_desc *feature_desc);
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/*
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* VirtIO Bus Methods.
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*/
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uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
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int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
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struct vq_alloc_info *info);
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int virtio_setup_intr(device_t dev, enum intr_type type);
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int virtio_with_feature(device_t dev, uint64_t feature);
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void virtio_stop(device_t dev);
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int virtio_reinit(device_t dev, uint64_t features);
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void virtio_reinit_complete(device_t dev);
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/*
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* Read/write a variable amount from the device specific (ie, network)
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* configuration region. This region is encoded in the same endian as
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* the guest.
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*/
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void virtio_read_device_config(device_t dev, bus_size_t offset,
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void *dst, int length);
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void virtio_write_device_config(device_t dev, bus_size_t offset,
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void *src, int length);
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/* Inlined device specific read/write functions for common lengths. */
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#define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
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static inline type \
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__CONCAT(virtio_read_dev_config_,size)(device_t dev, \
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bus_size_t offset) \
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{ \
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type val; \
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virtio_read_device_config(dev, offset, &val, sizeof(type)); \
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return (val); \
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} \
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\
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static inline void \
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__CONCAT(virtio_write_dev_config_,size)(device_t dev, \
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bus_size_t offset, type val) \
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{ \
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virtio_write_device_config(dev, offset, &val, sizeof(type)); \
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}
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VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
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VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
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VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
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#endif /* _VIRTIO_H_ */
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