1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Intel MIC Platform Software Stack (MPSS) 4 * 5 * Copyright(c) 2016 Intel Corporation. 6 * 7 * Intel Virtio Over PCIe (VOP) driver. 8 */ 9 #ifndef _VOP_MAIN_H_ 10 #define _VOP_MAIN_H_ 11 12 #include <linux/vringh.h> 13 #include <linux/virtio_config.h> 14 #include <linux/virtio.h> 15 #include <linux/miscdevice.h> 16 17 #include <linux/mic_common.h> 18 #include "../common/mic_dev.h" 19 20 #include "../bus/vop_bus.h" 21 22 /* 23 * Note on endianness. 24 * 1. Host can be both BE or LE 25 * 2. Guest/card is LE. Host uses le_to_cpu to access desc/avail 26 * rings and ioreadXX/iowriteXX to access used ring. 27 * 3. Device page exposed by host to guest contains LE values. Guest 28 * accesses these using ioreadXX/iowriteXX etc. This way in general we 29 * obey the virtio spec according to which guest works with native 30 * endianness and host is aware of guest endianness and does all 31 * required endianness conversion. 32 * 4. Data provided from user space to guest (in ADD_DEVICE and 33 * CONFIG_CHANGE ioctl's) is not interpreted by the driver and should be 34 * in guest endianness. 35 */ 36 37 /* 38 * vop_info - Allocated per invocation of VOP probe 39 * 40 * @vpdev: VOP device 41 * @hotplug_work: Handle virtio device creation, deletion and configuration 42 * @cookie: Cookie received upon requesting a virtio configuration interrupt 43 * @h2c_config_db: The doorbell used by the peer to indicate a config change 44 * @vdev_list: List of "active" virtio devices injected in the peer node 45 * @vop_mutex: Synchronize access to the device page as well as serialize 46 * creation/deletion of virtio devices on the peer node 47 * @dp: Peer device page information 48 * @dbg: Debugfs entry 49 * @dma_ch: The DMA channel used by this transport for data transfers. 50 * @name: Name for this transport used in misc device creation. 51 * @miscdev: The misc device registered. 52 */ 53 struct vop_info { 54 struct vop_device *vpdev; 55 struct work_struct hotplug_work; 56 struct mic_irq *cookie; 57 int h2c_config_db; 58 struct list_head vdev_list; 59 struct mutex vop_mutex; 60 void __iomem *dp; 61 struct dentry *dbg; 62 struct dma_chan *dma_ch; 63 char name[16]; 64 struct miscdevice miscdev; 65 }; 66 67 /** 68 * struct vop_vringh - Virtio ring host information. 69 * 70 * @vring: The VOP vring used for setting up user space mappings. 71 * @vrh: The host VRINGH used for accessing the card vrings. 72 * @riov: The VRINGH read kernel IOV. 73 * @wiov: The VRINGH write kernel IOV. 74 * @head: The VRINGH head index address passed to vringh_getdesc_kern(..). 75 * @vr_mutex: Mutex for synchronizing access to the VRING. 76 * @buf: Temporary kernel buffer used to copy in/out data 77 * from/to the card via DMA. 78 * @buf_da: dma address of buf. 79 * @vdev: Back pointer to VOP virtio device for vringh_notify(..). 80 */ 81 struct vop_vringh { 82 struct mic_vring vring; 83 struct vringh vrh; 84 struct vringh_kiov riov; 85 struct vringh_kiov wiov; 86 u16 head; 87 struct mutex vr_mutex; 88 void *buf; 89 dma_addr_t buf_da; 90 struct vop_vdev *vdev; 91 }; 92 93 /** 94 * struct vop_vdev - Host information for a card Virtio device. 95 * 96 * @virtio_id - Virtio device id. 97 * @waitq - Waitqueue to allow ring3 apps to poll. 98 * @vpdev - pointer to VOP bus device. 99 * @poll_wake - Used for waking up threads blocked in poll. 100 * @out_bytes - Debug stats for number of bytes copied from host to card. 101 * @in_bytes - Debug stats for number of bytes copied from card to host. 102 * @out_bytes_dma - Debug stats for number of bytes copied from host to card 103 * using DMA. 104 * @in_bytes_dma - Debug stats for number of bytes copied from card to host 105 * using DMA. 106 * @tx_len_unaligned - Debug stats for number of bytes copied to the card where 107 * the transfer length did not have the required DMA alignment. 108 * @tx_dst_unaligned - Debug stats for number of bytes copied where the 109 * destination address on the card did not have the required DMA alignment. 110 * @vvr - Store per VRING data structures. 111 * @virtio_bh_work - Work struct used to schedule virtio bottom half handling. 112 * @dd - Virtio device descriptor. 113 * @dc - Virtio device control fields. 114 * @list - List of Virtio devices. 115 * @virtio_db - The doorbell used by the card to interrupt the host. 116 * @virtio_cookie - The cookie returned while requesting interrupts. 117 * @vi: Transport information. 118 * @vdev_mutex: Mutex synchronizing virtio device injection, 119 * removal and data transfers. 120 * @destroy: Track if a virtio device is being destroyed. 121 * @deleted: The virtio device has been deleted. 122 */ 123 struct vop_vdev { 124 int virtio_id; 125 wait_queue_head_t waitq; 126 struct vop_device *vpdev; 127 int poll_wake; 128 unsigned long out_bytes; 129 unsigned long in_bytes; 130 unsigned long out_bytes_dma; 131 unsigned long in_bytes_dma; 132 unsigned long tx_len_unaligned; 133 unsigned long tx_dst_unaligned; 134 unsigned long rx_dst_unaligned; 135 struct vop_vringh vvr[MIC_MAX_VRINGS]; 136 struct work_struct virtio_bh_work; 137 struct mic_device_desc *dd; 138 struct mic_device_ctrl *dc; 139 struct list_head list; 140 int virtio_db; 141 struct mic_irq *virtio_cookie; 142 struct vop_info *vi; 143 struct mutex vdev_mutex; 144 struct completion destroy; 145 bool deleted; 146 }; 147 148 /* Helper API to check if a virtio device is running */ vop_vdevup(struct vop_vdev * vdev)149static inline bool vop_vdevup(struct vop_vdev *vdev) 150 { 151 return !!vdev->dd->status; 152 } 153 154 void vop_init_debugfs(struct vop_info *vi); 155 void vop_exit_debugfs(struct vop_info *vi); 156 int vop_host_init(struct vop_info *vi); 157 void vop_host_uninit(struct vop_info *vi); 158 #endif 159
