151 lines
5.4 KiB
C
151 lines
5.4 KiB
C
/*
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* libqos virtio definitions
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*
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* Copyright (c) 2014 Marc Marí
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef LIBQOS_VIRTIO_H
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#define LIBQOS_VIRTIO_H
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#include "libqos/malloc.h"
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#include "standard-headers/linux/virtio_ring.h"
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#define QVIRTIO_F_BAD_FEATURE 0x40000000
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typedef struct QVirtioBus QVirtioBus;
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typedef struct QVirtioDevice {
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const QVirtioBus *bus;
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/* Device type */
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uint16_t device_type;
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} QVirtioDevice;
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typedef struct QVirtQueue {
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uint64_t desc; /* This points to an array of struct vring_desc */
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uint64_t avail; /* This points to a struct vring_avail */
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uint64_t used; /* This points to a struct vring_used */
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uint16_t index;
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uint32_t size;
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uint32_t free_head;
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uint32_t num_free;
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uint32_t align;
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uint16_t last_used_idx;
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bool indirect;
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bool event;
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} QVirtQueue;
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typedef struct QVRingIndirectDesc {
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uint64_t desc; /* This points to an array fo struct vring_desc */
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uint16_t index;
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uint16_t elem;
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} QVRingIndirectDesc;
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struct QVirtioBus {
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uint8_t (*config_readb)(QVirtioDevice *d, uint64_t addr);
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uint16_t (*config_readw)(QVirtioDevice *d, uint64_t addr);
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uint32_t (*config_readl)(QVirtioDevice *d, uint64_t addr);
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uint64_t (*config_readq)(QVirtioDevice *d, uint64_t addr);
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/* Get features of the device */
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uint32_t (*get_features)(QVirtioDevice *d);
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/* Set features of the device */
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void (*set_features)(QVirtioDevice *d, uint32_t features);
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/* Get features of the guest */
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uint32_t (*get_guest_features)(QVirtioDevice *d);
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/* Get status of the device */
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uint8_t (*get_status)(QVirtioDevice *d);
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/* Set status of the device */
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void (*set_status)(QVirtioDevice *d, uint8_t status);
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/* Get the queue ISR status of the device */
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bool (*get_queue_isr_status)(QVirtioDevice *d, QVirtQueue *vq);
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/* Get the configuration ISR status of the device */
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bool (*get_config_isr_status)(QVirtioDevice *d);
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/* Select a queue to work on */
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void (*queue_select)(QVirtioDevice *d, uint16_t index);
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/* Get the size of the selected queue */
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uint16_t (*get_queue_size)(QVirtioDevice *d);
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/* Set the address of the selected queue */
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void (*set_queue_address)(QVirtioDevice *d, uint32_t pfn);
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/* Setup the virtqueue specified by index */
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QVirtQueue *(*virtqueue_setup)(QVirtioDevice *d, QGuestAllocator *alloc,
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uint16_t index);
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/* Free virtqueue resources */
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void (*virtqueue_cleanup)(QVirtQueue *vq, QGuestAllocator *alloc);
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/* Notify changes in virtqueue */
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void (*virtqueue_kick)(QVirtioDevice *d, QVirtQueue *vq);
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};
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static inline bool qvirtio_is_big_endian(QVirtioDevice *d)
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{
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/* FIXME: virtio 1.0 is always little-endian */
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return qtest_big_endian(global_qtest);
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}
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static inline uint32_t qvring_size(uint32_t num, uint32_t align)
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{
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return ((sizeof(struct vring_desc) * num + sizeof(uint16_t) * (3 + num)
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+ align - 1) & ~(align - 1))
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+ sizeof(uint16_t) * 3 + sizeof(struct vring_used_elem) * num;
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}
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uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr);
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uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr);
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uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr);
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uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr);
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uint32_t qvirtio_get_features(QVirtioDevice *d);
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void qvirtio_set_features(QVirtioDevice *d, uint32_t features);
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void qvirtio_reset(QVirtioDevice *d);
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void qvirtio_set_acknowledge(QVirtioDevice *d);
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void qvirtio_set_driver(QVirtioDevice *d);
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void qvirtio_set_driver_ok(QVirtioDevice *d);
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void qvirtio_wait_queue_isr(QVirtioDevice *d,
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QVirtQueue *vq, gint64 timeout_us);
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uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
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QVirtQueue *vq,
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uint64_t addr,
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gint64 timeout_us);
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void qvirtio_wait_used_elem(QVirtioDevice *d,
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QVirtQueue *vq,
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uint32_t desc_idx,
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uint32_t *len,
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gint64 timeout_us);
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void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us);
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QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
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QGuestAllocator *alloc, uint16_t index);
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void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
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QGuestAllocator *alloc);
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void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr);
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QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
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QGuestAllocator *alloc, uint16_t elem);
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void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
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uint32_t len, bool write);
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uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
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bool next);
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uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect);
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void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head);
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bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx, uint32_t *len);
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void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx);
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const char *qvirtio_get_dev_type(void);
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#endif
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