1 /* 2 * Copyright (c) 2011-2014, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 */ 13 14 #ifndef _NVME_H 15 #define _NVME_H 16 17 #include <linux/nvme.h> 18 #include <linux/pci.h> 19 #include <linux/kref.h> 20 #include <linux/blk-mq.h> 21 #include <linux/lightnvm.h> 22 23 enum { 24 /* 25 * Driver internal status code for commands that were cancelled due 26 * to timeouts or controller shutdown. The value is negative so 27 * that it a) doesn't overlap with the unsigned hardware error codes, 28 * and b) can easily be tested for. 29 */ 30 NVME_SC_CANCELLED = -EINTR, 31 }; 32 33 extern unsigned char nvme_io_timeout; 34 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) 35 36 extern unsigned char admin_timeout; 37 #define ADMIN_TIMEOUT (admin_timeout * HZ) 38 39 extern unsigned char shutdown_timeout; 40 #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ) 41 42 #define NVME_DEFAULT_KATO 5 43 #define NVME_KATO_GRACE 10 44 45 extern unsigned int nvme_max_retries; 46 47 enum { 48 NVME_NS_LBA = 0, 49 NVME_NS_LIGHTNVM = 1, 50 }; 51 52 /* 53 * List of workarounds for devices that required behavior not specified in 54 * the standard. 55 */ 56 enum nvme_quirks { 57 /* 58 * Prefers I/O aligned to a stripe size specified in a vendor 59 * specific Identify field. 60 */ 61 NVME_QUIRK_STRIPE_SIZE = (1 << 0), 62 63 /* 64 * The controller doesn't handle Identify value others than 0 or 1 65 * correctly. 66 */ 67 NVME_QUIRK_IDENTIFY_CNS = (1 << 1), 68 69 /* 70 * The controller deterministically returns O's on reads to discarded 71 * logical blocks. 72 */ 73 NVME_QUIRK_DISCARD_ZEROES = (1 << 2), 74 75 /* 76 * The controller needs a delay before starts checking the device 77 * readiness, which is done by reading the NVME_CSTS_RDY bit. 78 */ 79 NVME_QUIRK_DELAY_BEFORE_CHK_RDY = (1 << 3), 80 }; 81 82 /* 83 * Common request structure for NVMe passthrough. All drivers must have 84 * this structure as the first member of their request-private data. 85 */ 86 struct nvme_request { 87 struct nvme_command *cmd; 88 union nvme_result result; 89 }; 90 91 static inline struct nvme_request *nvme_req(struct request *req) 92 { 93 return blk_mq_rq_to_pdu(req); 94 } 95 96 /* The below value is the specific amount of delay needed before checking 97 * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the 98 * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was 99 * found empirically. 100 */ 101 #define NVME_QUIRK_DELAY_AMOUNT 2000 102 103 enum nvme_ctrl_state { 104 NVME_CTRL_NEW, 105 NVME_CTRL_LIVE, 106 NVME_CTRL_RESETTING, 107 NVME_CTRL_RECONNECTING, 108 NVME_CTRL_DELETING, 109 NVME_CTRL_DEAD, 110 }; 111 112 struct nvme_ctrl { 113 enum nvme_ctrl_state state; 114 spinlock_t lock; 115 const struct nvme_ctrl_ops *ops; 116 struct request_queue *admin_q; 117 struct request_queue *connect_q; 118 struct device *dev; 119 struct kref kref; 120 int instance; 121 struct blk_mq_tag_set *tagset; 122 struct list_head namespaces; 123 struct mutex namespaces_mutex; 124 struct device *device; /* char device */ 125 struct list_head node; 126 struct ida ns_ida; 127 128 char name[12]; 129 char serial[20]; 130 char model[40]; 131 char firmware_rev[8]; 132 u16 cntlid; 133 134 u32 ctrl_config; 135 136 u32 page_size; 137 u32 max_hw_sectors; 138 u32 stripe_size; 139 u16 oncs; 140 u16 vid; 141 atomic_t abort_limit; 142 u8 event_limit; 143 u8 vwc; 144 u32 vs; 145 u32 sgls; 146 u16 kas; 147 unsigned int kato; 148 bool subsystem; 149 unsigned long quirks; 150 struct work_struct scan_work; 151 struct work_struct async_event_work; 152 struct delayed_work ka_work; 153 154 /* Fabrics only */ 155 u16 sqsize; 156 u32 ioccsz; 157 u32 iorcsz; 158 u16 icdoff; 159 u16 maxcmd; 160 struct nvmf_ctrl_options *opts; 161 }; 162 163 /* 164 * An NVM Express namespace is equivalent to a SCSI LUN 165 */ 166 struct nvme_ns { 167 struct list_head list; 168 169 struct nvme_ctrl *ctrl; 170 struct request_queue *queue; 171 struct gendisk *disk; 172 struct nvm_dev *ndev; 173 struct kref kref; 174 int instance; 175 176 u8 eui[8]; 177 u8 uuid[16]; 178 179 unsigned ns_id; 180 int lba_shift; 181 u16 ms; 182 bool ext; 183 u8 pi_type; 184 unsigned long flags; 185 186 #define NVME_NS_REMOVING 0 187 #define NVME_NS_DEAD 1 188 189 u64 mode_select_num_blocks; 190 u32 mode_select_block_len; 191 }; 192 193 struct nvme_ctrl_ops { 194 const char *name; 195 struct module *module; 196 bool is_fabrics; 197 int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val); 198 int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); 199 int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); 200 int (*reset_ctrl)(struct nvme_ctrl *ctrl); 201 void (*free_ctrl)(struct nvme_ctrl *ctrl); 202 void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx); 203 int (*delete_ctrl)(struct nvme_ctrl *ctrl); 204 const char *(*get_subsysnqn)(struct nvme_ctrl *ctrl); 205 int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); 206 }; 207 208 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl) 209 { 210 u32 val = 0; 211 212 if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val)) 213 return false; 214 return val & NVME_CSTS_RDY; 215 } 216 217 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl) 218 { 219 if (!ctrl->subsystem) 220 return -ENOTTY; 221 return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65); 222 } 223 224 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector) 225 { 226 return (sector >> (ns->lba_shift - 9)); 227 } 228 229 static inline unsigned nvme_map_len(struct request *rq) 230 { 231 if (req_op(rq) == REQ_OP_DISCARD) 232 return sizeof(struct nvme_dsm_range); 233 else 234 return blk_rq_bytes(rq); 235 } 236 237 static inline void nvme_cleanup_cmd(struct request *req) 238 { 239 if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { 240 kfree(page_address(req->special_vec.bv_page) + 241 req->special_vec.bv_offset); 242 } 243 } 244 245 static inline int nvme_error_status(u16 status) 246 { 247 switch (status & 0x7ff) { 248 case NVME_SC_SUCCESS: 249 return 0; 250 case NVME_SC_CAP_EXCEEDED: 251 return -ENOSPC; 252 default: 253 return -EIO; 254 } 255 } 256 257 static inline bool nvme_req_needs_retry(struct request *req, u16 status) 258 { 259 return !(status & NVME_SC_DNR || blk_noretry_request(req)) && 260 (jiffies - req->start_time) < req->timeout && 261 req->retries < nvme_max_retries; 262 } 263 264 void nvme_cancel_request(struct request *req, void *data, bool reserved); 265 bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, 266 enum nvme_ctrl_state new_state); 267 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap); 268 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap); 269 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl); 270 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, 271 const struct nvme_ctrl_ops *ops, unsigned long quirks); 272 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl); 273 void nvme_put_ctrl(struct nvme_ctrl *ctrl); 274 int nvme_init_identify(struct nvme_ctrl *ctrl); 275 276 void nvme_queue_scan(struct nvme_ctrl *ctrl); 277 void nvme_remove_namespaces(struct nvme_ctrl *ctrl); 278 279 #define NVME_NR_AERS 1 280 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, 281 union nvme_result *res); 282 void nvme_queue_async_events(struct nvme_ctrl *ctrl); 283 284 void nvme_stop_queues(struct nvme_ctrl *ctrl); 285 void nvme_start_queues(struct nvme_ctrl *ctrl); 286 void nvme_kill_queues(struct nvme_ctrl *ctrl); 287 288 #define NVME_QID_ANY -1 289 struct request *nvme_alloc_request(struct request_queue *q, 290 struct nvme_command *cmd, unsigned int flags, int qid); 291 void nvme_requeue_req(struct request *req); 292 int nvme_setup_cmd(struct nvme_ns *ns, struct request *req, 293 struct nvme_command *cmd); 294 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 295 void *buf, unsigned bufflen); 296 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 297 union nvme_result *result, void *buffer, unsigned bufflen, 298 unsigned timeout, int qid, int at_head, int flags); 299 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, 300 void __user *ubuffer, unsigned bufflen, u32 *result, 301 unsigned timeout); 302 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, 303 void __user *ubuffer, unsigned bufflen, 304 void __user *meta_buffer, unsigned meta_len, u32 meta_seed, 305 u32 *result, unsigned timeout); 306 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id); 307 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, 308 struct nvme_id_ns **id); 309 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log); 310 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, 311 void *buffer, size_t buflen, u32 *result); 312 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, 313 void *buffer, size_t buflen, u32 *result); 314 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count); 315 void nvme_start_keep_alive(struct nvme_ctrl *ctrl); 316 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl); 317 318 struct sg_io_hdr; 319 320 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr); 321 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg); 322 int nvme_sg_get_version_num(int __user *ip); 323 324 #ifdef CONFIG_NVM 325 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id); 326 int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); 327 void nvme_nvm_unregister(struct nvme_ns *ns); 328 int nvme_nvm_register_sysfs(struct nvme_ns *ns); 329 void nvme_nvm_unregister_sysfs(struct nvme_ns *ns); 330 #else 331 static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, 332 int node) 333 { 334 return 0; 335 } 336 337 static inline void nvme_nvm_unregister(struct nvme_ns *ns) {}; 338 static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns) 339 { 340 return 0; 341 } 342 static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {}; 343 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) 344 { 345 return 0; 346 } 347 #endif /* CONFIG_NVM */ 348 349 static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev) 350 { 351 return dev_to_disk(dev)->private_data; 352 } 353 354 int __init nvme_core_init(void); 355 void nvme_core_exit(void); 356 357 #endif /* _NVME_H */ 358