186 lines
6.1 KiB
C
186 lines
6.1 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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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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_SCSI 0x08
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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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#define VIRTIO_IVAR_VENDOR 3
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#define VIRTIO_IVAR_DEVICE 4
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#define VIRTIO_IVAR_SUBVENDOR 5
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#define VIRTIO_IVAR_SUBDEVICE 6
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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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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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void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
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void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
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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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#undef VIRTIO_RDWR_DEVICE_CONFIG
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#define VIRTIO_READ_IVAR(name, ivar) \
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static inline int \
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__CONCAT(virtio_get_,name)(device_t dev) \
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{ \
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uintptr_t val; \
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virtio_read_ivar(dev, ivar, &val); \
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return ((int) val); \
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}
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VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
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VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
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VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
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VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
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VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
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#undef VIRTIO_READ_IVAR
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#define VIRTIO_WRITE_IVAR(name, ivar) \
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static inline void \
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__CONCAT(virtio_set_,name)(device_t dev, void *val) \
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{ \
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virtio_write_ivar(dev, ivar, (uintptr_t) val); \
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}
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VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
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#undef VIRTIO_WRITE_IVAR
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#endif /* _VIRTIO_H_ */
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