/* $NetBSD: virtiovar.h,v 1.20 2021/02/05 19:18:23 reinoud Exp $ */ /* * 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; uint16_t *vq_used_event; /* trails avail */ uint16_t *vq_avail_event; /* trails used */ /* 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; int vq_queued; kmutex_t vq_aring_lock; kmutex_t vq_uring_lock; /* interrupt handler */ int (*vq_done)(struct virtqueue*); int (*vq_intrhand)(void *); void *vq_intrhand_arg; /* for 1.0 */ uint32_t vq_notify_off; }; struct virtio_attach_args { int sc_childdevid; }; typedef int (*virtio_callback)(struct virtio_softc*); #ifdef VIRTIO_PRIVATE struct virtio_ops { void (*kick)(struct virtio_softc *, uint16_t); uint16_t (*read_queue_size)(struct virtio_softc *, uint16_t); void (*setup_queue)(struct virtio_softc *, uint16_t, uint64_t); void (*set_status)(struct virtio_softc *, int); void (*neg_features)(struct virtio_softc *, uint64_t); int (*setup_interrupts)(struct virtio_softc *); void (*free_interrupts)(struct virtio_softc *); }; struct virtio_softc { device_t sc_dev; const struct virtio_ops *sc_ops; bus_dma_tag_t sc_dmat; int sc_bus_endian; int sc_struct_endian; bus_space_tag_t sc_devcfg_iot; bus_space_handle_t sc_devcfg_ioh; bus_size_t sc_devcfg_iosize; int sc_ipl; /* set by child */ void *sc_soft_ih; int sc_flags; /* set by child */ uint64_t sc_active_features; bool sc_indirect; bool sc_version_1; bool sc_finished_called; int sc_nvqs; /* set by child */ struct virtqueue *sc_vqs; /* set by child */ int sc_childdevid; device_t sc_child; /* set by child */ bool sc_child_mq; virtio_callback sc_config_change; /* set by child */ virtio_callback sc_intrhand; /* set by child */ }; #else struct virtio_softc; #endif /* interupt types, stored in virtio_softc->sc_flags */ #define VIRTIO_F_INTR_MPSAFE (1 << 0) #define VIRTIO_F_INTR_SOFTINT (1 << 1) #define VIRTIO_F_INTR_MSIX (1 << 2) #define VIRTIO_CHILD_FAILED ((void *)1) /* public interface */ void virtio_negotiate_features(struct virtio_softc*, uint64_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); uint16_t virtio_read_device_config_le_2(struct virtio_softc *, int); uint32_t virtio_read_device_config_le_4(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); void virtio_write_device_config_le_2(struct virtio_softc *, int, uint16_t); void virtio_write_device_config_le_4(struct virtio_softc *, int, uint32_t); int virtio_alloc_vq(struct virtio_softc*, struct virtqueue*, int, int, int, const char*); int virtio_free_vq(struct virtio_softc*, struct virtqueue*); void virtio_reset(struct virtio_softc *); void virtio_reinit_start(struct virtio_softc *); void virtio_reinit_end(struct virtio_softc *); void virtio_child_attach_start(struct virtio_softc *, device_t, int, struct virtqueue *, virtio_callback, virtio_callback, int, int, const char *); void virtio_child_attach_set_vqs(struct virtio_softc *, struct virtqueue *, int); int virtio_child_attach_finish(struct virtio_softc *); void virtio_child_attach_failed(struct virtio_softc *); void virtio_child_detach(struct virtio_softc *); 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); bool virtio_vq_is_enqueued(struct virtio_softc *, struct virtqueue *); int virtio_vq_intr(struct virtio_softc *); int virtio_vq_intrhand(struct virtio_softc *); int virtio_postpone_intr(struct virtio_softc *sc, struct virtqueue *vq, uint16_t nslots); int virtio_postpone_intr_smart(struct virtio_softc *sc, struct virtqueue *vq); int virtio_postpone_intr_far(struct virtio_softc *sc, struct virtqueue *vq); void virtio_stop_vq_intr(struct virtio_softc *, struct virtqueue *); int virtio_start_vq_intr(struct virtio_softc *, struct virtqueue *); /* encapsulation */ bus_dma_tag_t virtio_dmat(struct virtio_softc *); device_t virtio_child(struct virtio_softc *); int virtio_intrhand(struct virtio_softc *); uint64_t virtio_features(struct virtio_softc *); /* autoconf(9) common */ void virtio_set_status(struct virtio_softc *, int); void virtio_print_device_type(device_t, int, int); int virtio_attach_failed(struct virtio_softc *); #define virtio_device_reset(sc) virtio_set_status((sc), 0) /* endian conversion */ /* * Virtio structures are read/written in host endian for 0.9 but little endian * for 1.0. One notable exception is AArch BE that always uses little endian. */ uint16_t virtio_rw16(struct virtio_softc *sc, uint16_t val); uint32_t virtio_rw32(struct virtio_softc *sc, uint32_t val); uint64_t virtio_rw64(struct virtio_softc *sc, uint64_t val); #endif /* _DEV_PCI_VIRTIOVAR_H_ */