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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2016 Intel Corporation.
*
* Intel Virtio Over PCIe (VOP) driver.
*/
#ifndef _VOP_MAIN_H_
#define _VOP_MAIN_H_
#include <linux/vringh.h>
#include <linux/virtio_config.h>
#include <linux/virtio.h>
#include <linux/miscdevice.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "../bus/vop_bus.h"
/*
* Note on endianness.
* 1. Host can be both BE or LE
* 2. Guest/card is LE. Host uses le_to_cpu to access desc/avail
* rings and ioreadXX/iowriteXX to access used ring.
* 3. Device page exposed by host to guest contains LE values. Guest
* accesses these using ioreadXX/iowriteXX etc. This way in general we
* obey the virtio spec according to which guest works with native
* endianness and host is aware of guest endianness and does all
* required endianness conversion.
* 4. Data provided from user space to guest (in ADD_DEVICE and
* CONFIG_CHANGE ioctl's) is not interpreted by the driver and should be
* in guest endianness.
*/
/*
* vop_info - Allocated per invocation of VOP probe
*
* @vpdev: VOP device
* @hotplug_work: Handle virtio device creation, deletion and configuration
* @cookie: Cookie received upon requesting a virtio configuration interrupt
* @h2c_config_db: The doorbell used by the peer to indicate a config change
* @vdev_list: List of "active" virtio devices injected in the peer node
* @vop_mutex: Synchronize access to the device page as well as serialize
* creation/deletion of virtio devices on the peer node
* @dp: Peer device page information
* @dbg: Debugfs entry
* @dma_ch: The DMA channel used by this transport for data transfers.
* @name: Name for this transport used in misc device creation.
* @miscdev: The misc device registered.
*/
struct vop_info {
struct vop_device *vpdev;
struct work_struct hotplug_work;
struct mic_irq *cookie;
int h2c_config_db;
struct list_head vdev_list;
struct mutex vop_mutex;
void __iomem *dp;
struct dentry *dbg;
struct dma_chan *dma_ch;
char name[16];
struct miscdevice miscdev;
};
/**
* struct vop_vringh - Virtio ring host information.
*
* @vring: The VOP vring used for setting up user space mappings.
* @vrh: The host VRINGH used for accessing the card vrings.
* @riov: The VRINGH read kernel IOV.
* @wiov: The VRINGH write kernel IOV.
* @head: The VRINGH head index address passed to vringh_getdesc_kern(..).
* @vr_mutex: Mutex for synchronizing access to the VRING.
* @buf: Temporary kernel buffer used to copy in/out data
* from/to the card via DMA.
* @buf_da: dma address of buf.
* @vdev: Back pointer to VOP virtio device for vringh_notify(..).
*/
struct vop_vringh {
struct mic_vring vring;
struct vringh vrh;
struct vringh_kiov riov;
struct vringh_kiov wiov;
u16 head;
struct mutex vr_mutex;
void *buf;
dma_addr_t buf_da;
struct vop_vdev *vdev;
};
/**
* struct vop_vdev - Host information for a card Virtio device.
*
* @virtio_id - Virtio device id.
* @waitq - Waitqueue to allow ring3 apps to poll.
* @vpdev - pointer to VOP bus device.
* @poll_wake - Used for waking up threads blocked in poll.
* @out_bytes - Debug stats for number of bytes copied from host to card.
* @in_bytes - Debug stats for number of bytes copied from card to host.
* @out_bytes_dma - Debug stats for number of bytes copied from host to card
* using DMA.
* @in_bytes_dma - Debug stats for number of bytes copied from card to host
* using DMA.
* @tx_len_unaligned - Debug stats for number of bytes copied to the card where
* the transfer length did not have the required DMA alignment.
* @tx_dst_unaligned - Debug stats for number of bytes copied where the
* destination address on the card did not have the required DMA alignment.
* @vvr - Store per VRING data structures.
* @virtio_bh_work - Work struct used to schedule virtio bottom half handling.
* @dd - Virtio device descriptor.
* @dc - Virtio device control fields.
* @list - List of Virtio devices.
* @virtio_db - The doorbell used by the card to interrupt the host.
* @virtio_cookie - The cookie returned while requesting interrupts.
* @vi: Transport information.
* @vdev_mutex: Mutex synchronizing virtio device injection,
* removal and data transfers.
* @destroy: Track if a virtio device is being destroyed.
* @deleted: The virtio device has been deleted.
*/
struct vop_vdev {
int virtio_id;
wait_queue_head_t waitq;
struct vop_device *vpdev;
int poll_wake;
unsigned long out_bytes;
unsigned long in_bytes;
unsigned long out_bytes_dma;
unsigned long in_bytes_dma;
unsigned long tx_len_unaligned;
unsigned long tx_dst_unaligned;
unsigned long rx_dst_unaligned;
struct vop_vringh vvr[MIC_MAX_VRINGS];
struct work_struct virtio_bh_work;
struct mic_device_desc *dd;
struct mic_device_ctrl *dc;
struct list_head list;
int virtio_db;
struct mic_irq *virtio_cookie;
struct vop_info *vi;
struct mutex vdev_mutex;
struct completion destroy;
bool deleted;
};
/* Helper API to check if a virtio device is running */
static inline bool vop_vdevup(struct vop_vdev *vdev)
{
return !!vdev->dd->status;
}
void vop_init_debugfs(struct vop_info *vi);
void vop_exit_debugfs(struct vop_info *vi);
int vop_host_init(struct vop_info *vi);
void vop_host_uninit(struct vop_info *vi);
#endif
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