1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef BLK_INTERNAL_H 3 #define BLK_INTERNAL_H 4 5 #include <linux/idr.h> 6 #include <linux/blk-mq.h> 7 #include <xen/xen.h> 8 #include "blk-mq.h" 9 10 /* Max future timer expiry for timeouts */ 11 #define BLK_MAX_TIMEOUT (5 * HZ) 12 13 #ifdef CONFIG_DEBUG_FS 14 extern struct dentry *blk_debugfs_root; 15 #endif 16 17 struct blk_flush_queue { 18 unsigned int flush_queue_delayed:1; 19 unsigned int flush_pending_idx:1; 20 unsigned int flush_running_idx:1; 21 unsigned long flush_pending_since; 22 struct list_head flush_queue[2]; 23 struct list_head flush_data_in_flight; 24 struct request *flush_rq; 25 26 /* 27 * flush_rq shares tag with this rq, both can't be active 28 * at the same time 29 */ 30 struct request *orig_rq; 31 spinlock_t mq_flush_lock; 32 }; 33 34 extern struct kmem_cache *blk_requestq_cachep; 35 extern struct kobj_type blk_queue_ktype; 36 extern struct ida blk_queue_ida; 37 38 static inline struct blk_flush_queue * 39 blk_get_flush_queue(struct request_queue *q, struct blk_mq_ctx *ctx) 40 { 41 return blk_mq_map_queue(q, REQ_OP_FLUSH, ctx)->fq; 42 } 43 44 static inline void __blk_get_queue(struct request_queue *q) 45 { 46 kobject_get(&q->kobj); 47 } 48 49 struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q, 50 int node, int cmd_size, gfp_t flags); 51 void blk_free_flush_queue(struct blk_flush_queue *q); 52 53 void blk_exit_queue(struct request_queue *q); 54 void blk_rq_bio_prep(struct request_queue *q, struct request *rq, 55 struct bio *bio); 56 void blk_freeze_queue(struct request_queue *q); 57 58 static inline void blk_queue_enter_live(struct request_queue *q) 59 { 60 /* 61 * Given that running in generic_make_request() context 62 * guarantees that a live reference against q_usage_counter has 63 * been established, further references under that same context 64 * need not check that the queue has been frozen (marked dead). 65 */ 66 percpu_ref_get(&q->q_usage_counter); 67 } 68 69 static inline bool biovec_phys_mergeable(struct request_queue *q, 70 struct bio_vec *vec1, struct bio_vec *vec2) 71 { 72 unsigned long mask = queue_segment_boundary(q); 73 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; 74 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; 75 76 if (addr1 + vec1->bv_len != addr2) 77 return false; 78 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2)) 79 return false; 80 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) 81 return false; 82 return true; 83 } 84 85 static inline bool __bvec_gap_to_prev(struct request_queue *q, 86 struct bio_vec *bprv, unsigned int offset) 87 { 88 return (offset & queue_virt_boundary(q)) || 89 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); 90 } 91 92 /* 93 * Check if adding a bio_vec after bprv with offset would create a gap in 94 * the SG list. Most drivers don't care about this, but some do. 95 */ 96 static inline bool bvec_gap_to_prev(struct request_queue *q, 97 struct bio_vec *bprv, unsigned int offset) 98 { 99 if (!queue_virt_boundary(q)) 100 return false; 101 return __bvec_gap_to_prev(q, bprv, offset); 102 } 103 104 #ifdef CONFIG_BLK_DEV_INTEGRITY 105 void blk_flush_integrity(void); 106 bool __bio_integrity_endio(struct bio *); 107 static inline bool bio_integrity_endio(struct bio *bio) 108 { 109 if (bio_integrity(bio)) 110 return __bio_integrity_endio(bio); 111 return true; 112 } 113 114 static inline bool integrity_req_gap_back_merge(struct request *req, 115 struct bio *next) 116 { 117 struct bio_integrity_payload *bip = bio_integrity(req->bio); 118 struct bio_integrity_payload *bip_next = bio_integrity(next); 119 120 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], 121 bip_next->bip_vec[0].bv_offset); 122 } 123 124 static inline bool integrity_req_gap_front_merge(struct request *req, 125 struct bio *bio) 126 { 127 struct bio_integrity_payload *bip = bio_integrity(bio); 128 struct bio_integrity_payload *bip_next = bio_integrity(req->bio); 129 130 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], 131 bip_next->bip_vec[0].bv_offset); 132 } 133 #else /* CONFIG_BLK_DEV_INTEGRITY */ 134 static inline bool integrity_req_gap_back_merge(struct request *req, 135 struct bio *next) 136 { 137 return false; 138 } 139 static inline bool integrity_req_gap_front_merge(struct request *req, 140 struct bio *bio) 141 { 142 return false; 143 } 144 145 static inline void blk_flush_integrity(void) 146 { 147 } 148 static inline bool bio_integrity_endio(struct bio *bio) 149 { 150 return true; 151 } 152 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 153 154 unsigned long blk_rq_timeout(unsigned long timeout); 155 void blk_add_timer(struct request *req); 156 157 bool bio_attempt_front_merge(struct request_queue *q, struct request *req, 158 struct bio *bio); 159 bool bio_attempt_back_merge(struct request_queue *q, struct request *req, 160 struct bio *bio); 161 bool bio_attempt_discard_merge(struct request_queue *q, struct request *req, 162 struct bio *bio); 163 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, 164 struct request **same_queue_rq); 165 166 void blk_account_io_start(struct request *req, bool new_io); 167 void blk_account_io_completion(struct request *req, unsigned int bytes); 168 void blk_account_io_done(struct request *req, u64 now); 169 170 /* 171 * Internal elevator interface 172 */ 173 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) 174 175 void blk_insert_flush(struct request *rq); 176 177 int elevator_init_mq(struct request_queue *q); 178 int elevator_switch_mq(struct request_queue *q, 179 struct elevator_type *new_e); 180 void elevator_exit(struct request_queue *, struct elevator_queue *); 181 int elv_register_queue(struct request_queue *q); 182 void elv_unregister_queue(struct request_queue *q); 183 184 struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); 185 186 #ifdef CONFIG_FAIL_IO_TIMEOUT 187 int blk_should_fake_timeout(struct request_queue *); 188 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); 189 ssize_t part_timeout_store(struct device *, struct device_attribute *, 190 const char *, size_t); 191 #else 192 static inline int blk_should_fake_timeout(struct request_queue *q) 193 { 194 return 0; 195 } 196 #endif 197 198 int ll_back_merge_fn(struct request_queue *q, struct request *req, 199 struct bio *bio); 200 int ll_front_merge_fn(struct request_queue *q, struct request *req, 201 struct bio *bio); 202 struct request *attempt_back_merge(struct request_queue *q, struct request *rq); 203 struct request *attempt_front_merge(struct request_queue *q, struct request *rq); 204 int blk_attempt_req_merge(struct request_queue *q, struct request *rq, 205 struct request *next); 206 void blk_recalc_rq_segments(struct request *rq); 207 void blk_rq_set_mixed_merge(struct request *rq); 208 bool blk_rq_merge_ok(struct request *rq, struct bio *bio); 209 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); 210 211 int blk_dev_init(void); 212 213 /* 214 * Contribute to IO statistics IFF: 215 * 216 * a) it's attached to a gendisk, and 217 * b) the queue had IO stats enabled when this request was started, and 218 * c) it's a file system request 219 */ 220 static inline bool blk_do_io_stat(struct request *rq) 221 { 222 return rq->rq_disk && 223 (rq->rq_flags & RQF_IO_STAT) && 224 !blk_rq_is_passthrough(rq); 225 } 226 227 static inline void req_set_nomerge(struct request_queue *q, struct request *req) 228 { 229 req->cmd_flags |= REQ_NOMERGE; 230 if (req == q->last_merge) 231 q->last_merge = NULL; 232 } 233 234 /* 235 * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size 236 * is defined as 'unsigned int', meantime it has to aligned to with logical 237 * block size which is the minimum accepted unit by hardware. 238 */ 239 static inline unsigned int bio_allowed_max_sectors(struct request_queue *q) 240 { 241 return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9; 242 } 243 244 /* 245 * Internal io_context interface 246 */ 247 void get_io_context(struct io_context *ioc); 248 struct io_cq *ioc_lookup_icq(struct io_context *ioc, struct request_queue *q); 249 struct io_cq *ioc_create_icq(struct io_context *ioc, struct request_queue *q, 250 gfp_t gfp_mask); 251 void ioc_clear_queue(struct request_queue *q); 252 253 int create_task_io_context(struct task_struct *task, gfp_t gfp_mask, int node); 254 255 /** 256 * create_io_context - try to create task->io_context 257 * @gfp_mask: allocation mask 258 * @node: allocation node 259 * 260 * If %current->io_context is %NULL, allocate a new io_context and install 261 * it. Returns the current %current->io_context which may be %NULL if 262 * allocation failed. 263 * 264 * Note that this function can't be called with IRQ disabled because 265 * task_lock which protects %current->io_context is IRQ-unsafe. 266 */ 267 static inline struct io_context *create_io_context(gfp_t gfp_mask, int node) 268 { 269 WARN_ON_ONCE(irqs_disabled()); 270 if (unlikely(!current->io_context)) 271 create_task_io_context(current, gfp_mask, node); 272 return current->io_context; 273 } 274 275 /* 276 * Internal throttling interface 277 */ 278 #ifdef CONFIG_BLK_DEV_THROTTLING 279 extern void blk_throtl_drain(struct request_queue *q); 280 extern int blk_throtl_init(struct request_queue *q); 281 extern void blk_throtl_exit(struct request_queue *q); 282 extern void blk_throtl_register_queue(struct request_queue *q); 283 #else /* CONFIG_BLK_DEV_THROTTLING */ 284 static inline void blk_throtl_drain(struct request_queue *q) { } 285 static inline int blk_throtl_init(struct request_queue *q) { return 0; } 286 static inline void blk_throtl_exit(struct request_queue *q) { } 287 static inline void blk_throtl_register_queue(struct request_queue *q) { } 288 #endif /* CONFIG_BLK_DEV_THROTTLING */ 289 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW 290 extern ssize_t blk_throtl_sample_time_show(struct request_queue *q, char *page); 291 extern ssize_t blk_throtl_sample_time_store(struct request_queue *q, 292 const char *page, size_t count); 293 extern void blk_throtl_bio_endio(struct bio *bio); 294 extern void blk_throtl_stat_add(struct request *rq, u64 time); 295 #else 296 static inline void blk_throtl_bio_endio(struct bio *bio) { } 297 static inline void blk_throtl_stat_add(struct request *rq, u64 time) { } 298 #endif 299 300 #ifdef CONFIG_BOUNCE 301 extern int init_emergency_isa_pool(void); 302 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); 303 #else 304 static inline int init_emergency_isa_pool(void) 305 { 306 return 0; 307 } 308 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) 309 { 310 } 311 #endif /* CONFIG_BOUNCE */ 312 313 #ifdef CONFIG_BLK_CGROUP_IOLATENCY 314 extern int blk_iolatency_init(struct request_queue *q); 315 #else 316 static inline int blk_iolatency_init(struct request_queue *q) { return 0; } 317 #endif 318 319 struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp); 320 321 #ifdef CONFIG_BLK_DEV_ZONED 322 void blk_queue_free_zone_bitmaps(struct request_queue *q); 323 #else 324 static inline void blk_queue_free_zone_bitmaps(struct request_queue *q) {} 325 #endif 326 327 #endif /* BLK_INTERNAL_H */ 328