170 lines
5.8 KiB
C
170 lines
5.8 KiB
C
/*
|
|
* Intel MIC Platform Software Stack (MPSS)
|
|
*
|
|
* Copyright(c) 2016 Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* The full GNU General Public License is included in this distribution in
|
|
* the file called "COPYING".
|
|
*
|
|
* 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
|