/* $NetBSD$ */ /* * Copyright (c) 2010 Minoura Makoto. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * Part of the file derived from `Virtio PCI Card Specification v0.8.6 DRAFT' * Appendix A. */ /* An interface for efficient virtio implementation. * * This header is BSD licensed so anyone can use the definitions * to implement compatible drivers/servers. * * Copyright 2007, 2009, IBM Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of IBM nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _DEV_PCI_VIRTIOVAR_H_ #define _DEV_PCI_VIRTIOVAR_H_ #include #include #include #include struct vq_entry { SIMPLEQ_ENTRY(vq_entry) qe_list; /* free list */ uint16_t qe_index; /* index in vq_desc array */ /* followings are used only when it is the `head' entry */ int16_t qe_next; /* next enq slot */ bool qe_indirect; /* 1 if using indirect */ struct vring_desc *qe_desc_base; }; struct virtqueue { struct virtio_softc *vq_owner; unsigned int vq_num; /* queue size (# of entries) */ int vq_index; /* queue number (0, 1, ...) */ /* vring pointers (KVA) */ struct vring_desc *vq_desc; struct vring_avail *vq_avail; struct vring_used *vq_used; void *vq_indirect; /* virtqueue allocation info */ void *vq_vaddr; int vq_availoffset; int vq_usedoffset; int vq_indirectoffset; bus_dma_segment_t vq_segs[1]; unsigned int vq_bytesize; bus_dmamap_t vq_dmamap; int vq_maxsegsize; int vq_maxnsegs; /* free entry management */ struct vq_entry *vq_entries; SIMPLEQ_HEAD(, vq_entry) vq_freelist; kmutex_t vq_freelist_lock; /* enqueue/dequeue status */ uint16_t vq_avail_idx; uint16_t vq_used_idx; uint16_t vq_used_flags; int16_t /* XXX */ vq_queued; kmutex_t vq_aring_lock; kmutex_t vq_uring_lock; /* interrupt handler */ int (*vq_done)(struct virtqueue*); }; struct virtio_softc { device_t sc_dev; pci_chipset_tag_t sc_pc; pcitag_t sc_tag; bus_dma_tag_t sc_dmat; int sc_ipl; /* set by child */ void *sc_ih; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; int sc_config_offset; uint32_t sc_features; bool sc_indirect; int sc_nvqs; /* set by child */ struct virtqueue *sc_vqs; /* set by child */ int sc_childdevid; device_t sc_child; /* set by child */ int (*sc_config_change)(struct virtio_softc*); /* set by child */ int (*sc_intrhand)(struct virtio_softc*); /* set by child */ }; /* The standard layout for the ring is a continuous chunk of memory which * looks like this. We assume num is a power of 2. * * struct vring { * // The actual descriptors (16 bytes each) * struct vring_desc desc[num]; * * // A ring of available descriptor heads with free-running index. * __u16 avail_flags; * __u16 avail_idx; * __u16 available[num]; * * // Padding to the next align boundary. * char pad[]; * * // A ring of used descriptor heads with free-running index. * __u16 used_flags; * __u16 used_idx; * struct vring_used_elem used[num]; * }; * Note: for virtio PCI, align is 4096. */ /* public interface */ uint32_t virtio_negotiate_features(struct virtio_softc*, uint32_t); uint8_t virtio_read_device_config_1(struct virtio_softc *, int); uint16_t virtio_read_device_config_2(struct virtio_softc *, int); uint32_t virtio_read_device_config_4(struct virtio_softc *, int); uint64_t virtio_read_device_config_8(struct virtio_softc *, int); void virtio_write_device_config_1(struct virtio_softc *, int, uint8_t); void virtio_write_device_config_2(struct virtio_softc *, int, uint16_t); void virtio_write_device_config_4(struct virtio_softc *, int, uint32_t); void virtio_write_device_config_8(struct virtio_softc *, int, uint64_t); int virtio_alloc_vq(struct virtio_softc*, struct virtqueue*, int, int, int, const char*); int virtio_free_vq(struct virtio_softc*, struct virtqueue*); int virtio_enqueue_prep(struct virtio_softc*, struct virtqueue*, int*); int virtio_enqueue_reserve(struct virtio_softc*, struct virtqueue*, int, int); int virtio_enqueue(struct virtio_softc*, struct virtqueue*, int, bus_dmamap_t, bool); int virtio_enqueue_p(struct virtio_softc*, struct virtqueue*, int, bus_dmamap_t, bus_addr_t, bus_size_t, bool); int virtio_enqueue_commit(struct virtio_softc*, struct virtqueue*, int, bool); int virtio_enqueue_abort(struct virtio_softc*, struct virtqueue*, int); int virtio_dequeue(struct virtio_softc*, struct virtqueue*, int *, int *); int virtio_dequeue_commit(struct virtio_softc*, struct virtqueue*, int); int virtio_vq_intr(struct virtio_softc *); void virtio_stop_vq_intr(struct virtio_softc *, struct virtqueue *); void virtio_start_vq_intr(struct virtio_softc *, struct virtqueue *); #endif /* _DEV_PCI_VIRTIOVAR_H_ */