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NetBSD/sys/dev/pci/virtiovar.h
ozaki-r ccf27199d5 Support MSI-X in virtio 
Currently only vioif(4) uses the feature.

knakahara@ helped to migrate to pci_intr_alloc(9). Thanks!
2015-10-26 01:44:48 +00:00

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/* $NetBSD: virtiovar.h,v 1.5 2015/10/26 01:44:48 ozaki-r 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 <sys/types.h>
#include <sys/queue.h>
#include <sys/bus.h>
#include <dev/pci/virtioreg.h>
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;
int 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 */
pci_intr_handle_t *sc_ihp;
void **sc_ihs;
int sc_ihs_num;
void *sc_soft_ih;
int sc_flags; /* set by child */
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
bus_size_t sc_iosize;
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 */
};
#define VIRTIO_F_PCI_INTR_MPSAFE (1 << 0)
#define VIRTIO_F_PCI_INTR_SOFTINT (1 << 1)
#define VIRTIO_F_PCI_INTR_MSIX (1 << 2)
/* 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*);
void virtio_reset(struct virtio_softc *);
void virtio_reinit_start(struct virtio_softc *);
void virtio_reinit_end(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);
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_ */
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