/* * 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; }Contributors
| Person | Tokens | Prop | Commits | CommitProp | |
| sudeep dutt | sudeep dutt | 21 | 100.00% | 1 | 100.00% |
| Total | 21 | 100.00% | 1 | 100.00% |
| Person | Tokens | Prop | Commits | CommitProp | |
| sudeep dutt | sudeep dutt | 283 | 100.00% | 1 | 100.00% |
| Total | 283 | 100.00% | 1 | 100.00% |