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Annotation of qemu/hw/virtio.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Virtio Support
        !             3:  *
        !             4:  * Copyright IBM, Corp. 2007
        !             5:  *
        !             6:  * Authors:
        !             7:  *  Anthony Liguori   <[email protected]>
        !             8:  *
        !             9:  * This work is licensed under the terms of the GNU GPL, version 2.  See
        !            10:  * the COPYING file in the top-level directory.
        !            11:  *
        !            12:  */
        !            13: 
        !            14: #ifndef _QEMU_VIRTIO_H
        !            15: #define _QEMU_VIRTIO_H
        !            16: 
        !            17: #include "hw.h"
        !            18: #include "pci.h"
        !            19: 
        !            20: /* from Linux's linux/virtio_config.h */
        !            21: 
        !            22: /* Status byte for guest to report progress, and synchronize features. */
        !            23: /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
        !            24: #define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
        !            25: /* We have found a driver for the device. */
        !            26: #define VIRTIO_CONFIG_S_DRIVER          2
        !            27: /* Driver has used its parts of the config, and is happy */
        !            28: #define VIRTIO_CONFIG_S_DRIVER_OK       4
        !            29: /* We've given up on this device. */
        !            30: #define VIRTIO_CONFIG_S_FAILED          0x80
        !            31: 
        !            32: /* We notify when the ring is completely used, even if the guest is supressing
        !            33:  * callbacks */
        !            34: #define VIRTIO_F_NOTIFY_ON_EMPTY        24
        !            35: 
        !            36: /* from Linux's linux/virtio_ring.h */
        !            37: 
        !            38: /* This marks a buffer as continuing via the next field. */
        !            39: #define VRING_DESC_F_NEXT       1
        !            40: /* This marks a buffer as write-only (otherwise read-only). */
        !            41: #define VRING_DESC_F_WRITE      2
        !            42: 
        !            43: /* This means don't notify other side when buffer added. */
        !            44: #define VRING_USED_F_NO_NOTIFY  1
        !            45: /* This means don't interrupt guest when buffer consumed. */
        !            46: #define VRING_AVAIL_F_NO_INTERRUPT      1
        !            47: 
        !            48: struct VirtQueue;
        !            49: 
        !            50: static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
        !            51:                                              unsigned long align)
        !            52: {
        !            53:     return (addr + align - 1) & ~(align - 1);
        !            54: }
        !            55: 
        !            56: typedef struct VirtQueue VirtQueue;
        !            57: typedef struct VirtIODevice VirtIODevice;
        !            58: 
        !            59: #define VIRTQUEUE_MAX_SIZE 1024
        !            60: 
        !            61: typedef struct VirtQueueElement
        !            62: {
        !            63:     unsigned int index;
        !            64:     unsigned int out_num;
        !            65:     unsigned int in_num;
        !            66:     target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
        !            67:     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
        !            68:     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
        !            69: } VirtQueueElement;
        !            70: 
        !            71: #define VIRTIO_PCI_QUEUE_MAX 16
        !            72: 
        !            73: struct VirtIODevice
        !            74: {
        !            75:     PCIDevice pci_dev;
        !            76:     const char *name;
        !            77:     uint32_t addr;
        !            78:     uint8_t status;
        !            79:     uint8_t isr;
        !            80:     uint16_t queue_sel;
        !            81:     uint32_t features;
        !            82:     size_t config_len;
        !            83:     void *config;
        !            84:     uint32_t (*get_features)(VirtIODevice *vdev);
        !            85:     void (*set_features)(VirtIODevice *vdev, uint32_t val);
        !            86:     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
        !            87:     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
        !            88:     void (*reset)(VirtIODevice *vdev);
        !            89:     VirtQueue *vq;
        !            90: };
        !            91: 
        !            92: VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
        !            93:                               uint16_t vendor, uint16_t device,
        !            94:                               uint16_t subvendor, uint16_t subdevice,
        !            95:                               uint16_t class_code, uint8_t pif,
        !            96:                               size_t config_size, size_t struct_size);
        !            97: 
        !            98: VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
        !            99:                             void (*handle_output)(VirtIODevice *,
        !           100:                                                   VirtQueue *));
        !           101: 
        !           102: void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
        !           103:                     unsigned int len);
        !           104: void virtqueue_flush(VirtQueue *vq, unsigned int count);
        !           105: void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
        !           106:                     unsigned int len, unsigned int idx);
        !           107: 
        !           108: int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
        !           109: int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
        !           110: 
        !           111: void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
        !           112: 
        !           113: void virtio_save(VirtIODevice *vdev, QEMUFile *f);
        !           114: 
        !           115: void virtio_load(VirtIODevice *vdev, QEMUFile *f);
        !           116: 
        !           117: void virtio_notify_config(VirtIODevice *vdev);
        !           118: 
        !           119: void virtio_queue_set_notification(VirtQueue *vq, int enable);
        !           120: 
        !           121: int virtio_queue_ready(VirtQueue *vq);
        !           122: 
        !           123: int virtio_queue_empty(VirtQueue *vq);
        !           124: 
        !           125: #endif

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