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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2022 Oxide Computer Company
*/
/*
* VIRTIO 9P DRIVER
*/
#ifndef _VIO9P_IMPL_H
#define _VIO9P_IMPL_H
#include "virtio.h"
#include <sys/vio9p.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* VIRTIO 9P CONFIGURATION REGISTERS
*
* These are offsets into the device-specific configuration space available
* through the virtio_dev_*() family of functions.
*/
#define VIRTIO_9P_CONFIG_TAG_SZ 0x00 /* 16 R */
#define VIRTIO_9P_CONFIG_TAG 0x02 /* SZ R */
/*
* VIRTIO 9P VIRTQUEUES
*
* Virtio 9P devices have just one queue which is used to make 9P requests.
* Each submitted chain should include appropriately sized inbound and outbound
* descriptors for the request and response messages. The maximum size is
* negotiated via the "msize" member of the 9P TVERSION request and RVERSION
* response. Some hypervisors may require the first 7 bytes (size, type, tag)
* to be contiguous in the first descriptor.
*/
#define VIRTIO_9P_VIRTQ_REQUESTS 0
/*
* VIRTIO 9P FEATURE BITS
*/
#define VIRTIO_9P_F_MOUNT_TAG (1ULL << 0)
/*
* These features are supported by the driver and we will request them from the
* device.
*/
#define VIRTIO_9P_WANTED_FEATURES (VIRTIO_9P_F_MOUNT_TAG)
/*
* DRIVER PARAMETERS
*/
/*
* A limit on the number of requests that can be allocated for a vio9p device.
*/
#define VIRTIO_9P_MAX_REQS 8
/*
* This parameter defines an upper bound on 9P protocol message size (msize). 9P
* servers may negotiate an msize up to this value. An attempt to transfer a
* message larger than this will result in a EMSGISZE error.
*/
#define VIRTIO_9P_REQ_SIZE 65536
/*
* It is not clear that there is a well-defined number of cookies for this
* interface; QEMU may support as many as there are direct descriptors in the
* ring, and bhyve may support something like 128. We'll use a conservative
* number that's large enough to ensure we'll be able to allocate without
* requiring contiguous pages.
*/
#define VIRTIO_9P_MAX_SGL 64
/*
* TYPE DEFINITIONS
*/
typedef enum vio9p_teardown_style {
VIRTIO_9P_TEARDOWN_PRE_MUTEX,
VIRTIO_9P_TEARDOWN_ATTACH,
VIRTIO_9P_TEARDOWN_DETACH,
} vio9p_teardown_style_t;
typedef struct vio9p_req {
virtio_dma_t *vnr_dma_in;
virtio_dma_t *vnr_dma_out;
virtio_chain_t *vnr_chain;
list_node_t vnr_link;
list_node_t vnr_link_complete;
list_node_t vnr_link_free;
uint64_t vnr_generation;
} vio9p_req_t;
typedef struct vio9p {
dev_info_t *vin_dip;
virtio_t *vin_virtio;
virtio_queue_t *vin_vq;
kmutex_t vin_mutex;
kcondvar_t vin_cv;
/*
* When the device is opened, select a generation number. This will be
* used to discard completed responses that arrive after the device was
* closed and reopened.
*/
uint64_t vin_generation;
bool vin_open;
uint_t vin_nreqs;
list_t vin_reqs;
list_t vin_completes;
list_t vin_req_freelist;
char vin_tag[VIO9P_MOUNT_TAG_SIZE];
} vio9p_t;
#ifdef __cplusplus
}
#endif
#endif /* _VIO9P_IMPL_H */
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