1 /* 2 * Intel MIC Platform Software Stack (MPSS) 3 * 4 * Copyright(c) 2013 Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License, version 2, as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * The full GNU General Public License is included in this distribution in 16 * the file called "COPYING". 17 * 18 * Intel MIC driver. 19 * 20 */ 21 #ifndef __MIC_COMMON_H_ 22 #define __MIC_COMMON_H_ 23 24 #include <linux/virtio_ring.h> 25 26 #define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1)) 27 28 /** 29 * struct mic_device_desc: Virtio device information shared between the 30 * virtio driver and userspace backend 31 * 32 * @type: Device type: console/network/disk etc. Type 0/-1 terminates. 33 * @num_vq: Number of virtqueues. 34 * @feature_len: Number of bytes of feature bits. Multiply by 2: one for 35 host features and one for guest acknowledgements. 36 * @config_len: Number of bytes of the config array after virtqueues. 37 * @status: A status byte, written by the Guest. 38 * @config: Start of the following variable length config. 39 */ 40 struct mic_device_desc { 41 __s8 type; 42 __u8 num_vq; 43 __u8 feature_len; 44 __u8 config_len; 45 __u8 status; 46 __le64 config[0]; 47 } __attribute__ ((aligned(8))); 48 49 /** 50 * struct mic_device_ctrl: Per virtio device information in the device page 51 * used internally by the host and card side drivers. 52 * 53 * @vdev: Used for storing MIC vdev information by the guest. 54 * @config_change: Set to 1 by host when a config change is requested. 55 * @vdev_reset: Set to 1 by guest to indicate virtio device has been reset. 56 * @guest_ack: Set to 1 by guest to ack a command. 57 * @host_ack: Set to 1 by host to ack a command. 58 * @used_address_updated: Set to 1 by guest when the used address should be 59 * updated. 60 * @c2h_vdev_db: The doorbell number to be used by guest. Set by host. 61 * @h2c_vdev_db: The doorbell number to be used by host. Set by guest. 62 */ 63 struct mic_device_ctrl { 64 __le64 vdev; 65 __u8 config_change; 66 __u8 vdev_reset; 67 __u8 guest_ack; 68 __u8 host_ack; 69 __u8 used_address_updated; 70 __s8 c2h_vdev_db; 71 __s8 h2c_vdev_db; 72 } __attribute__ ((aligned(8))); 73 74 /** 75 * struct mic_bootparam: Virtio device independent information in device page 76 * 77 * @magic: A magic value used by the card to ensure it can see the host 78 * @h2c_config_db: Host to Card Virtio config doorbell set by card 79 * @node_id: Unique id of the node 80 * @h2c_scif_db - Host to card SCIF doorbell set by card 81 * @c2h_scif_db - Card to host SCIF doorbell set by host 82 * @scif_host_dma_addr - SCIF host queue pair DMA address 83 * @scif_card_dma_addr - SCIF card queue pair DMA address 84 */ 85 struct mic_bootparam { 86 __le32 magic; 87 __s8 h2c_config_db; 88 __u8 node_id; 89 __u8 h2c_scif_db; 90 __u8 c2h_scif_db; 91 __u64 scif_host_dma_addr; 92 __u64 scif_card_dma_addr; 93 } __attribute__ ((aligned(8))); 94 95 /** 96 * struct mic_device_page: High level representation of the device page 97 * 98 * @bootparam: The bootparam structure is used for sharing information and 99 * status updates between MIC host and card drivers. 100 * @desc: Array of MIC virtio device descriptors. 101 */ 102 struct mic_device_page { 103 struct mic_bootparam bootparam; 104 struct mic_device_desc desc[0]; 105 }; 106 /** 107 * struct mic_vqconfig: This is how we expect the device configuration field 108 * for a virtqueue to be laid out in config space. 109 * 110 * @address: Guest/MIC physical address of the virtio ring 111 * (avail and desc rings) 112 * @used_address: Guest/MIC physical address of the used ring 113 * @num: The number of entries in the virtio_ring 114 */ 115 struct mic_vqconfig { 116 __le64 address; 117 __le64 used_address; 118 __le16 num; 119 } __attribute__ ((aligned(8))); 120 121 /* 122 * The alignment to use between consumer and producer parts of vring. 123 * This is pagesize for historical reasons. 124 */ 125 #define MIC_VIRTIO_RING_ALIGN 4096 126 127 #define MIC_MAX_VRINGS 4 128 #define MIC_VRING_ENTRIES 128 129 130 /* 131 * Max vring entries (power of 2) to ensure desc and avail rings 132 * fit in a single page 133 */ 134 #define MIC_MAX_VRING_ENTRIES 128 135 136 /** 137 * Max size of the desc block in bytes: includes: 138 * - struct mic_device_desc 139 * - struct mic_vqconfig (num_vq of these) 140 * - host and guest features 141 * - virtio device config space 142 */ 143 #define MIC_MAX_DESC_BLK_SIZE 256 144 145 /** 146 * struct _mic_vring_info - Host vring info exposed to userspace backend 147 * for the avail index and magic for the card. 148 * 149 * @avail_idx: host avail idx 150 * @magic: A magic debug cookie. 151 */ 152 struct _mic_vring_info { 153 __u16 avail_idx; 154 __le32 magic; 155 }; 156 157 /** 158 * struct mic_vring - Vring information. 159 * 160 * @vr: The virtio ring. 161 * @info: Host vring information exposed to the userspace backend for the 162 * avail index and magic for the card. 163 * @va: The va for the buffer allocated for vr and info. 164 * @len: The length of the buffer required for allocating vr and info. 165 */ 166 struct mic_vring { 167 struct vring vr; 168 struct _mic_vring_info *info; 169 void *va; 170 int len; 171 }; 172 173 #define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8) 174 175 #ifndef INTEL_MIC_CARD 176 static inline unsigned mic_desc_size(const struct mic_device_desc *desc) 177 { 178 return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig) 179 + desc->feature_len * 2 + desc->config_len; 180 } 181 182 static inline struct mic_vqconfig * 183 mic_vq_config(const struct mic_device_desc *desc) 184 { 185 return (struct mic_vqconfig *)(desc + 1); 186 } 187 188 static inline __u8 *mic_vq_features(const struct mic_device_desc *desc) 189 { 190 return (__u8 *)(mic_vq_config(desc) + desc->num_vq); 191 } 192 193 static inline __u8 *mic_vq_configspace(const struct mic_device_desc *desc) 194 { 195 return mic_vq_features(desc) + desc->feature_len * 2; 196 } 197 static inline unsigned mic_total_desc_size(struct mic_device_desc *desc) 198 { 199 return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl); 200 } 201 #endif 202 203 /* Device page size */ 204 #define MIC_DP_SIZE 4096 205 206 #define MIC_MAGIC 0xc0ffee00 207 208 /** 209 * enum mic_states - MIC states. 210 */ 211 enum mic_states { 212 MIC_READY = 0, 213 MIC_BOOTING, 214 MIC_ONLINE, 215 MIC_SHUTTING_DOWN, 216 MIC_RESETTING, 217 MIC_RESET_FAILED, 218 MIC_LAST 219 }; 220 221 /** 222 * enum mic_status - MIC status reported by card after 223 * a host or card initiated shutdown or a card crash. 224 */ 225 enum mic_status { 226 MIC_NOP = 0, 227 MIC_CRASHED, 228 MIC_HALTED, 229 MIC_POWER_OFF, 230 MIC_RESTART, 231 MIC_STATUS_LAST 232 }; 233 234 #endif 235
