1a497ee34SChristoph Hellwig // SPDX-License-Identifier: GPL-2.0-or-later 2ea25da48SPaolo Valente /* 3ea25da48SPaolo Valente * cgroups support for the BFQ I/O scheduler. 4ea25da48SPaolo Valente */ 5ea25da48SPaolo Valente #include <linux/module.h> 6ea25da48SPaolo Valente #include <linux/slab.h> 7ea25da48SPaolo Valente #include <linux/blkdev.h> 8ea25da48SPaolo Valente #include <linux/cgroup.h> 9ea25da48SPaolo Valente #include <linux/ktime.h> 10ea25da48SPaolo Valente #include <linux/rbtree.h> 11ea25da48SPaolo Valente #include <linux/ioprio.h> 12ea25da48SPaolo Valente #include <linux/sbitmap.h> 13ea25da48SPaolo Valente #include <linux/delay.h> 14ea25da48SPaolo Valente 152e9bc346SChristoph Hellwig #include "elevator.h" 16ea25da48SPaolo Valente #include "bfq-iosched.h" 17ea25da48SPaolo Valente 188060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 19c0ce79dcSChristoph Hellwig static int bfq_stat_init(struct bfq_stat *stat, gfp_t gfp) 20c0ce79dcSChristoph Hellwig { 21c0ce79dcSChristoph Hellwig int ret; 22c0ce79dcSChristoph Hellwig 23c0ce79dcSChristoph Hellwig ret = percpu_counter_init(&stat->cpu_cnt, 0, gfp); 24c0ce79dcSChristoph Hellwig if (ret) 25c0ce79dcSChristoph Hellwig return ret; 26c0ce79dcSChristoph Hellwig 27c0ce79dcSChristoph Hellwig atomic64_set(&stat->aux_cnt, 0); 28c0ce79dcSChristoph Hellwig return 0; 29c0ce79dcSChristoph Hellwig } 30c0ce79dcSChristoph Hellwig 31c0ce79dcSChristoph Hellwig static void bfq_stat_exit(struct bfq_stat *stat) 32c0ce79dcSChristoph Hellwig { 33c0ce79dcSChristoph Hellwig percpu_counter_destroy(&stat->cpu_cnt); 34c0ce79dcSChristoph Hellwig } 35c0ce79dcSChristoph Hellwig 36c0ce79dcSChristoph Hellwig /** 37c0ce79dcSChristoph Hellwig * bfq_stat_add - add a value to a bfq_stat 38c0ce79dcSChristoph Hellwig * @stat: target bfq_stat 39c0ce79dcSChristoph Hellwig * @val: value to add 40c0ce79dcSChristoph Hellwig * 41c0ce79dcSChristoph Hellwig * Add @val to @stat. The caller must ensure that IRQ on the same CPU 42c0ce79dcSChristoph Hellwig * don't re-enter this function for the same counter. 43c0ce79dcSChristoph Hellwig */ 44c0ce79dcSChristoph Hellwig static inline void bfq_stat_add(struct bfq_stat *stat, uint64_t val) 45c0ce79dcSChristoph Hellwig { 46c0ce79dcSChristoph Hellwig percpu_counter_add_batch(&stat->cpu_cnt, val, BLKG_STAT_CPU_BATCH); 47c0ce79dcSChristoph Hellwig } 48c0ce79dcSChristoph Hellwig 49c0ce79dcSChristoph Hellwig /** 50c0ce79dcSChristoph Hellwig * bfq_stat_read - read the current value of a bfq_stat 51c0ce79dcSChristoph Hellwig * @stat: bfq_stat to read 52c0ce79dcSChristoph Hellwig */ 53c0ce79dcSChristoph Hellwig static inline uint64_t bfq_stat_read(struct bfq_stat *stat) 54c0ce79dcSChristoph Hellwig { 55c0ce79dcSChristoph Hellwig return percpu_counter_sum_positive(&stat->cpu_cnt); 56c0ce79dcSChristoph Hellwig } 57c0ce79dcSChristoph Hellwig 58c0ce79dcSChristoph Hellwig /** 59c0ce79dcSChristoph Hellwig * bfq_stat_reset - reset a bfq_stat 60c0ce79dcSChristoph Hellwig * @stat: bfq_stat to reset 61c0ce79dcSChristoph Hellwig */ 62c0ce79dcSChristoph Hellwig static inline void bfq_stat_reset(struct bfq_stat *stat) 63c0ce79dcSChristoph Hellwig { 64c0ce79dcSChristoph Hellwig percpu_counter_set(&stat->cpu_cnt, 0); 65c0ce79dcSChristoph Hellwig atomic64_set(&stat->aux_cnt, 0); 66c0ce79dcSChristoph Hellwig } 67c0ce79dcSChristoph Hellwig 68c0ce79dcSChristoph Hellwig /** 69c0ce79dcSChristoph Hellwig * bfq_stat_add_aux - add a bfq_stat into another's aux count 70c0ce79dcSChristoph Hellwig * @to: the destination bfq_stat 71c0ce79dcSChristoph Hellwig * @from: the source 72c0ce79dcSChristoph Hellwig * 73c0ce79dcSChristoph Hellwig * Add @from's count including the aux one to @to's aux count. 74c0ce79dcSChristoph Hellwig */ 75c0ce79dcSChristoph Hellwig static inline void bfq_stat_add_aux(struct bfq_stat *to, 76c0ce79dcSChristoph Hellwig struct bfq_stat *from) 77c0ce79dcSChristoph Hellwig { 78c0ce79dcSChristoph Hellwig atomic64_add(bfq_stat_read(from) + atomic64_read(&from->aux_cnt), 79c0ce79dcSChristoph Hellwig &to->aux_cnt); 80c0ce79dcSChristoph Hellwig } 81c0ce79dcSChristoph Hellwig 82c0ce79dcSChristoph Hellwig /** 83c0ce79dcSChristoph Hellwig * blkg_prfill_stat - prfill callback for bfq_stat 84c0ce79dcSChristoph Hellwig * @sf: seq_file to print to 85c0ce79dcSChristoph Hellwig * @pd: policy private data of interest 86c0ce79dcSChristoph Hellwig * @off: offset to the bfq_stat in @pd 87c0ce79dcSChristoph Hellwig * 88c0ce79dcSChristoph Hellwig * prfill callback for printing a bfq_stat. 89c0ce79dcSChristoph Hellwig */ 90c0ce79dcSChristoph Hellwig static u64 blkg_prfill_stat(struct seq_file *sf, struct blkg_policy_data *pd, 91c0ce79dcSChristoph Hellwig int off) 92c0ce79dcSChristoph Hellwig { 93c0ce79dcSChristoph Hellwig return __blkg_prfill_u64(sf, pd, bfq_stat_read((void *)pd + off)); 94c0ce79dcSChristoph Hellwig } 95c0ce79dcSChristoph Hellwig 96ea25da48SPaolo Valente /* bfqg stats flags */ 97ea25da48SPaolo Valente enum bfqg_stats_flags { 98ea25da48SPaolo Valente BFQG_stats_waiting = 0, 99ea25da48SPaolo Valente BFQG_stats_idling, 100ea25da48SPaolo Valente BFQG_stats_empty, 101ea25da48SPaolo Valente }; 102ea25da48SPaolo Valente 103ea25da48SPaolo Valente #define BFQG_FLAG_FNS(name) \ 104ea25da48SPaolo Valente static void bfqg_stats_mark_##name(struct bfqg_stats *stats) \ 105ea25da48SPaolo Valente { \ 106ea25da48SPaolo Valente stats->flags |= (1 << BFQG_stats_##name); \ 107ea25da48SPaolo Valente } \ 108ea25da48SPaolo Valente static void bfqg_stats_clear_##name(struct bfqg_stats *stats) \ 109ea25da48SPaolo Valente { \ 110ea25da48SPaolo Valente stats->flags &= ~(1 << BFQG_stats_##name); \ 111ea25da48SPaolo Valente } \ 112ea25da48SPaolo Valente static int bfqg_stats_##name(struct bfqg_stats *stats) \ 113ea25da48SPaolo Valente { \ 114ea25da48SPaolo Valente return (stats->flags & (1 << BFQG_stats_##name)) != 0; \ 115ea25da48SPaolo Valente } \ 116ea25da48SPaolo Valente 117ea25da48SPaolo Valente BFQG_FLAG_FNS(waiting) 118ea25da48SPaolo Valente BFQG_FLAG_FNS(idling) 119ea25da48SPaolo Valente BFQG_FLAG_FNS(empty) 120ea25da48SPaolo Valente #undef BFQG_FLAG_FNS 121ea25da48SPaolo Valente 1228f9bebc3SPaolo Valente /* This should be called with the scheduler lock held. */ 123ea25da48SPaolo Valente static void bfqg_stats_update_group_wait_time(struct bfqg_stats *stats) 124ea25da48SPaolo Valente { 12584c7afceSOmar Sandoval u64 now; 126ea25da48SPaolo Valente 127ea25da48SPaolo Valente if (!bfqg_stats_waiting(stats)) 128ea25da48SPaolo Valente return; 129ea25da48SPaolo Valente 13084c7afceSOmar Sandoval now = ktime_get_ns(); 13184c7afceSOmar Sandoval if (now > stats->start_group_wait_time) 132c0ce79dcSChristoph Hellwig bfq_stat_add(&stats->group_wait_time, 133ea25da48SPaolo Valente now - stats->start_group_wait_time); 134ea25da48SPaolo Valente bfqg_stats_clear_waiting(stats); 135ea25da48SPaolo Valente } 136ea25da48SPaolo Valente 1378f9bebc3SPaolo Valente /* This should be called with the scheduler lock held. */ 138ea25da48SPaolo Valente static void bfqg_stats_set_start_group_wait_time(struct bfq_group *bfqg, 139ea25da48SPaolo Valente struct bfq_group *curr_bfqg) 140ea25da48SPaolo Valente { 141ea25da48SPaolo Valente struct bfqg_stats *stats = &bfqg->stats; 142ea25da48SPaolo Valente 143ea25da48SPaolo Valente if (bfqg_stats_waiting(stats)) 144ea25da48SPaolo Valente return; 145ea25da48SPaolo Valente if (bfqg == curr_bfqg) 146ea25da48SPaolo Valente return; 14784c7afceSOmar Sandoval stats->start_group_wait_time = ktime_get_ns(); 148ea25da48SPaolo Valente bfqg_stats_mark_waiting(stats); 149ea25da48SPaolo Valente } 150ea25da48SPaolo Valente 1518f9bebc3SPaolo Valente /* This should be called with the scheduler lock held. */ 152ea25da48SPaolo Valente static void bfqg_stats_end_empty_time(struct bfqg_stats *stats) 153ea25da48SPaolo Valente { 15484c7afceSOmar Sandoval u64 now; 155ea25da48SPaolo Valente 156ea25da48SPaolo Valente if (!bfqg_stats_empty(stats)) 157ea25da48SPaolo Valente return; 158ea25da48SPaolo Valente 15984c7afceSOmar Sandoval now = ktime_get_ns(); 16084c7afceSOmar Sandoval if (now > stats->start_empty_time) 161c0ce79dcSChristoph Hellwig bfq_stat_add(&stats->empty_time, 162ea25da48SPaolo Valente now - stats->start_empty_time); 163ea25da48SPaolo Valente bfqg_stats_clear_empty(stats); 164ea25da48SPaolo Valente } 165ea25da48SPaolo Valente 166ea25da48SPaolo Valente void bfqg_stats_update_dequeue(struct bfq_group *bfqg) 167ea25da48SPaolo Valente { 168c0ce79dcSChristoph Hellwig bfq_stat_add(&bfqg->stats.dequeue, 1); 169ea25da48SPaolo Valente } 170ea25da48SPaolo Valente 171ea25da48SPaolo Valente void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) 172ea25da48SPaolo Valente { 173ea25da48SPaolo Valente struct bfqg_stats *stats = &bfqg->stats; 174ea25da48SPaolo Valente 175ea25da48SPaolo Valente if (blkg_rwstat_total(&stats->queued)) 176ea25da48SPaolo Valente return; 177ea25da48SPaolo Valente 178ea25da48SPaolo Valente /* 179ea25da48SPaolo Valente * group is already marked empty. This can happen if bfqq got new 180ea25da48SPaolo Valente * request in parent group and moved to this group while being added 181ea25da48SPaolo Valente * to service tree. Just ignore the event and move on. 182ea25da48SPaolo Valente */ 183ea25da48SPaolo Valente if (bfqg_stats_empty(stats)) 184ea25da48SPaolo Valente return; 185ea25da48SPaolo Valente 18684c7afceSOmar Sandoval stats->start_empty_time = ktime_get_ns(); 187ea25da48SPaolo Valente bfqg_stats_mark_empty(stats); 188ea25da48SPaolo Valente } 189ea25da48SPaolo Valente 190ea25da48SPaolo Valente void bfqg_stats_update_idle_time(struct bfq_group *bfqg) 191ea25da48SPaolo Valente { 192ea25da48SPaolo Valente struct bfqg_stats *stats = &bfqg->stats; 193ea25da48SPaolo Valente 194ea25da48SPaolo Valente if (bfqg_stats_idling(stats)) { 19584c7afceSOmar Sandoval u64 now = ktime_get_ns(); 196ea25da48SPaolo Valente 19784c7afceSOmar Sandoval if (now > stats->start_idle_time) 198c0ce79dcSChristoph Hellwig bfq_stat_add(&stats->idle_time, 199ea25da48SPaolo Valente now - stats->start_idle_time); 200ea25da48SPaolo Valente bfqg_stats_clear_idling(stats); 201ea25da48SPaolo Valente } 202ea25da48SPaolo Valente } 203ea25da48SPaolo Valente 204ea25da48SPaolo Valente void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) 205ea25da48SPaolo Valente { 206ea25da48SPaolo Valente struct bfqg_stats *stats = &bfqg->stats; 207ea25da48SPaolo Valente 20884c7afceSOmar Sandoval stats->start_idle_time = ktime_get_ns(); 209ea25da48SPaolo Valente bfqg_stats_mark_idling(stats); 210ea25da48SPaolo Valente } 211ea25da48SPaolo Valente 212ea25da48SPaolo Valente void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) 213ea25da48SPaolo Valente { 214ea25da48SPaolo Valente struct bfqg_stats *stats = &bfqg->stats; 215ea25da48SPaolo Valente 216c0ce79dcSChristoph Hellwig bfq_stat_add(&stats->avg_queue_size_sum, 217ea25da48SPaolo Valente blkg_rwstat_total(&stats->queued)); 218c0ce79dcSChristoph Hellwig bfq_stat_add(&stats->avg_queue_size_samples, 1); 219ea25da48SPaolo Valente bfqg_stats_update_group_wait_time(stats); 220ea25da48SPaolo Valente } 221ea25da48SPaolo Valente 222a33801e8SLuca Miccio void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq, 223dc469ba2SBart Van Assche blk_opf_t opf) 224a33801e8SLuca Miccio { 225dc469ba2SBart Van Assche blkg_rwstat_add(&bfqg->stats.queued, opf, 1); 226a33801e8SLuca Miccio bfqg_stats_end_empty_time(&bfqg->stats); 227aa625117SYu Kuai if (!(bfqq == bfqg->bfqd->in_service_queue)) 228a33801e8SLuca Miccio bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq)); 229a33801e8SLuca Miccio } 230a33801e8SLuca Miccio 231dc469ba2SBart Van Assche void bfqg_stats_update_io_remove(struct bfq_group *bfqg, blk_opf_t opf) 232a33801e8SLuca Miccio { 233dc469ba2SBart Van Assche blkg_rwstat_add(&bfqg->stats.queued, opf, -1); 234a33801e8SLuca Miccio } 235a33801e8SLuca Miccio 236dc469ba2SBart Van Assche void bfqg_stats_update_io_merged(struct bfq_group *bfqg, blk_opf_t opf) 237a33801e8SLuca Miccio { 238dc469ba2SBart Van Assche blkg_rwstat_add(&bfqg->stats.merged, opf, 1); 239a33801e8SLuca Miccio } 240a33801e8SLuca Miccio 24184c7afceSOmar Sandoval void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, 242dc469ba2SBart Van Assche u64 io_start_time_ns, blk_opf_t opf) 243a33801e8SLuca Miccio { 244a33801e8SLuca Miccio struct bfqg_stats *stats = &bfqg->stats; 24584c7afceSOmar Sandoval u64 now = ktime_get_ns(); 246a33801e8SLuca Miccio 24784c7afceSOmar Sandoval if (now > io_start_time_ns) 248dc469ba2SBart Van Assche blkg_rwstat_add(&stats->service_time, opf, 24984c7afceSOmar Sandoval now - io_start_time_ns); 25084c7afceSOmar Sandoval if (io_start_time_ns > start_time_ns) 251dc469ba2SBart Van Assche blkg_rwstat_add(&stats->wait_time, opf, 25284c7afceSOmar Sandoval io_start_time_ns - start_time_ns); 253a33801e8SLuca Miccio } 254a33801e8SLuca Miccio 2558060c47bSChristoph Hellwig #else /* CONFIG_BFQ_CGROUP_DEBUG */ 256a33801e8SLuca Miccio 257dc469ba2SBart Van Assche void bfqg_stats_update_io_remove(struct bfq_group *bfqg, blk_opf_t opf) { } 258dc469ba2SBart Van Assche void bfqg_stats_update_io_merged(struct bfq_group *bfqg, blk_opf_t opf) { } 25984c7afceSOmar Sandoval void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, 260dc469ba2SBart Van Assche u64 io_start_time_ns, blk_opf_t opf) { } 261a33801e8SLuca Miccio void bfqg_stats_update_dequeue(struct bfq_group *bfqg) { } 262a33801e8SLuca Miccio void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) { } 263a33801e8SLuca Miccio 2648060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 265a33801e8SLuca Miccio 266a33801e8SLuca Miccio #ifdef CONFIG_BFQ_GROUP_IOSCHED 267a33801e8SLuca Miccio 268ea25da48SPaolo Valente /* 269ea25da48SPaolo Valente * blk-cgroup policy-related handlers 270ea25da48SPaolo Valente * The following functions help in converting between blk-cgroup 271ea25da48SPaolo Valente * internal structures and BFQ-specific structures. 272ea25da48SPaolo Valente */ 273ea25da48SPaolo Valente 274ea25da48SPaolo Valente static struct bfq_group *pd_to_bfqg(struct blkg_policy_data *pd) 275ea25da48SPaolo Valente { 276ea25da48SPaolo Valente return pd ? container_of(pd, struct bfq_group, pd) : NULL; 277ea25da48SPaolo Valente } 278ea25da48SPaolo Valente 279ea25da48SPaolo Valente struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg) 280ea25da48SPaolo Valente { 281ea25da48SPaolo Valente return pd_to_blkg(&bfqg->pd); 282ea25da48SPaolo Valente } 283ea25da48SPaolo Valente 284ea25da48SPaolo Valente static struct bfq_group *blkg_to_bfqg(struct blkcg_gq *blkg) 285ea25da48SPaolo Valente { 286ea25da48SPaolo Valente return pd_to_bfqg(blkg_to_pd(blkg, &blkcg_policy_bfq)); 287ea25da48SPaolo Valente } 288ea25da48SPaolo Valente 289ea25da48SPaolo Valente /* 290ea25da48SPaolo Valente * bfq_group handlers 291ea25da48SPaolo Valente * The following functions help in navigating the bfq_group hierarchy 292ea25da48SPaolo Valente * by allowing to find the parent of a bfq_group or the bfq_group 293ea25da48SPaolo Valente * associated to a bfq_queue. 294ea25da48SPaolo Valente */ 295ea25da48SPaolo Valente 296ea25da48SPaolo Valente static struct bfq_group *bfqg_parent(struct bfq_group *bfqg) 297ea25da48SPaolo Valente { 298ea25da48SPaolo Valente struct blkcg_gq *pblkg = bfqg_to_blkg(bfqg)->parent; 299ea25da48SPaolo Valente 300ea25da48SPaolo Valente return pblkg ? blkg_to_bfqg(pblkg) : NULL; 301ea25da48SPaolo Valente } 302ea25da48SPaolo Valente 303ea25da48SPaolo Valente struct bfq_group *bfqq_group(struct bfq_queue *bfqq) 304ea25da48SPaolo Valente { 305ea25da48SPaolo Valente struct bfq_entity *group_entity = bfqq->entity.parent; 306ea25da48SPaolo Valente 307ea25da48SPaolo Valente return group_entity ? container_of(group_entity, struct bfq_group, 308ea25da48SPaolo Valente entity) : 309ea25da48SPaolo Valente bfqq->bfqd->root_group; 310ea25da48SPaolo Valente } 311ea25da48SPaolo Valente 312ea25da48SPaolo Valente /* 313ea25da48SPaolo Valente * The following two functions handle get and put of a bfq_group by 314ea25da48SPaolo Valente * wrapping the related blk-cgroup hooks. 315ea25da48SPaolo Valente */ 316ea25da48SPaolo Valente 317ea25da48SPaolo Valente static void bfqg_get(struct bfq_group *bfqg) 318ea25da48SPaolo Valente { 319216f7647SYu Kuai refcount_inc(&bfqg->ref); 320ea25da48SPaolo Valente } 321ea25da48SPaolo Valente 322dfb79af5SBart Van Assche static void bfqg_put(struct bfq_group *bfqg) 323ea25da48SPaolo Valente { 324216f7647SYu Kuai if (refcount_dec_and_test(&bfqg->ref)) 3258f9bebc3SPaolo Valente kfree(bfqg); 3268f9bebc3SPaolo Valente } 3278f9bebc3SPaolo Valente 3282de791abSDmitry Monakhov static void bfqg_and_blkg_get(struct bfq_group *bfqg) 3298f9bebc3SPaolo Valente { 3308f9bebc3SPaolo Valente /* see comments in bfq_bic_update_cgroup for why refcounting bfqg */ 3318f9bebc3SPaolo Valente bfqg_get(bfqg); 3328f9bebc3SPaolo Valente 3338f9bebc3SPaolo Valente blkg_get(bfqg_to_blkg(bfqg)); 3348f9bebc3SPaolo Valente } 3358f9bebc3SPaolo Valente 3368f9bebc3SPaolo Valente void bfqg_and_blkg_put(struct bfq_group *bfqg) 3378f9bebc3SPaolo Valente { 3388f9bebc3SPaolo Valente blkg_put(bfqg_to_blkg(bfqg)); 339d5274b3cSKonstantin Khlebnikov 340d5274b3cSKonstantin Khlebnikov bfqg_put(bfqg); 341ea25da48SPaolo Valente } 342ea25da48SPaolo Valente 343fd41e603STejun Heo void bfqg_stats_update_legacy_io(struct request_queue *q, struct request *rq) 344fd41e603STejun Heo { 345fd41e603STejun Heo struct bfq_group *bfqg = blkg_to_bfqg(rq->bio->bi_blkg); 346fd41e603STejun Heo 34708802ed6SHou Tao if (!bfqg) 34808802ed6SHou Tao return; 34908802ed6SHou Tao 350fd41e603STejun Heo blkg_rwstat_add(&bfqg->stats.bytes, rq->cmd_flags, blk_rq_bytes(rq)); 351fd41e603STejun Heo blkg_rwstat_add(&bfqg->stats.ios, rq->cmd_flags, 1); 352fd41e603STejun Heo } 353fd41e603STejun Heo 354ea25da48SPaolo Valente /* @stats = 0 */ 355ea25da48SPaolo Valente static void bfqg_stats_reset(struct bfqg_stats *stats) 356ea25da48SPaolo Valente { 3578060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 358ea25da48SPaolo Valente /* queued stats shouldn't be cleared */ 359ea25da48SPaolo Valente blkg_rwstat_reset(&stats->merged); 360ea25da48SPaolo Valente blkg_rwstat_reset(&stats->service_time); 361ea25da48SPaolo Valente blkg_rwstat_reset(&stats->wait_time); 362c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->time); 363c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->avg_queue_size_sum); 364c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->avg_queue_size_samples); 365c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->dequeue); 366c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->group_wait_time); 367c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->idle_time); 368c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->empty_time); 369a33801e8SLuca Miccio #endif 370ea25da48SPaolo Valente } 371ea25da48SPaolo Valente 372ea25da48SPaolo Valente /* @to += @from */ 373ea25da48SPaolo Valente static void bfqg_stats_add_aux(struct bfqg_stats *to, struct bfqg_stats *from) 374ea25da48SPaolo Valente { 375ea25da48SPaolo Valente if (!to || !from) 376ea25da48SPaolo Valente return; 377ea25da48SPaolo Valente 3788060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 379ea25da48SPaolo Valente /* queued stats shouldn't be cleared */ 380ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->merged, &from->merged); 381ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->service_time, &from->service_time); 382ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->wait_time, &from->wait_time); 383c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&from->time, &from->time); 384c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->avg_queue_size_sum, &from->avg_queue_size_sum); 385c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->avg_queue_size_samples, 386ea25da48SPaolo Valente &from->avg_queue_size_samples); 387c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->dequeue, &from->dequeue); 388c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->group_wait_time, &from->group_wait_time); 389c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->idle_time, &from->idle_time); 390c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->empty_time, &from->empty_time); 391a33801e8SLuca Miccio #endif 392ea25da48SPaolo Valente } 393ea25da48SPaolo Valente 394ea25da48SPaolo Valente /* 395ea25da48SPaolo Valente * Transfer @bfqg's stats to its parent's aux counts so that the ancestors' 396ea25da48SPaolo Valente * recursive stats can still account for the amount used by this bfqg after 397ea25da48SPaolo Valente * it's gone. 398ea25da48SPaolo Valente */ 399ea25da48SPaolo Valente static void bfqg_stats_xfer_dead(struct bfq_group *bfqg) 400ea25da48SPaolo Valente { 401ea25da48SPaolo Valente struct bfq_group *parent; 402ea25da48SPaolo Valente 403ea25da48SPaolo Valente if (!bfqg) /* root_group */ 404ea25da48SPaolo Valente return; 405ea25da48SPaolo Valente 406ea25da48SPaolo Valente parent = bfqg_parent(bfqg); 407ea25da48SPaolo Valente 4080d945c1fSChristoph Hellwig lockdep_assert_held(&bfqg_to_blkg(bfqg)->q->queue_lock); 409ea25da48SPaolo Valente 410ea25da48SPaolo Valente if (unlikely(!parent)) 411ea25da48SPaolo Valente return; 412ea25da48SPaolo Valente 413ea25da48SPaolo Valente bfqg_stats_add_aux(&parent->stats, &bfqg->stats); 414ea25da48SPaolo Valente bfqg_stats_reset(&bfqg->stats); 415ea25da48SPaolo Valente } 416ea25da48SPaolo Valente 417ea25da48SPaolo Valente void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) 418ea25da48SPaolo Valente { 419ea25da48SPaolo Valente struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 420ea25da48SPaolo Valente 421ea25da48SPaolo Valente entity->weight = entity->new_weight; 422ea25da48SPaolo Valente entity->orig_weight = entity->new_weight; 423ea25da48SPaolo Valente if (bfqq) { 424ea25da48SPaolo Valente bfqq->ioprio = bfqq->new_ioprio; 425ea25da48SPaolo Valente bfqq->ioprio_class = bfqq->new_ioprio_class; 4268f9bebc3SPaolo Valente /* 4278f9bebc3SPaolo Valente * Make sure that bfqg and its associated blkg do not 4288f9bebc3SPaolo Valente * disappear before entity. 4298f9bebc3SPaolo Valente */ 4308f9bebc3SPaolo Valente bfqg_and_blkg_get(bfqg); 431ea25da48SPaolo Valente } 432ea25da48SPaolo Valente entity->parent = bfqg->my_entity; /* NULL for root group */ 433ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 434ea25da48SPaolo Valente } 435ea25da48SPaolo Valente 436ea25da48SPaolo Valente static void bfqg_stats_exit(struct bfqg_stats *stats) 437ea25da48SPaolo Valente { 438fd41e603STejun Heo blkg_rwstat_exit(&stats->bytes); 439fd41e603STejun Heo blkg_rwstat_exit(&stats->ios); 4408060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 441ea25da48SPaolo Valente blkg_rwstat_exit(&stats->merged); 442ea25da48SPaolo Valente blkg_rwstat_exit(&stats->service_time); 443ea25da48SPaolo Valente blkg_rwstat_exit(&stats->wait_time); 444ea25da48SPaolo Valente blkg_rwstat_exit(&stats->queued); 445c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->time); 446c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->avg_queue_size_sum); 447c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->avg_queue_size_samples); 448c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->dequeue); 449c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->group_wait_time); 450c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->idle_time); 451c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->empty_time); 452a33801e8SLuca Miccio #endif 453ea25da48SPaolo Valente } 454ea25da48SPaolo Valente 455ea25da48SPaolo Valente static int bfqg_stats_init(struct bfqg_stats *stats, gfp_t gfp) 456ea25da48SPaolo Valente { 457fd41e603STejun Heo if (blkg_rwstat_init(&stats->bytes, gfp) || 458fd41e603STejun Heo blkg_rwstat_init(&stats->ios, gfp)) 4592fc428f6SZheng Liang goto error; 460fd41e603STejun Heo 4618060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 462ea25da48SPaolo Valente if (blkg_rwstat_init(&stats->merged, gfp) || 463ea25da48SPaolo Valente blkg_rwstat_init(&stats->service_time, gfp) || 464ea25da48SPaolo Valente blkg_rwstat_init(&stats->wait_time, gfp) || 465ea25da48SPaolo Valente blkg_rwstat_init(&stats->queued, gfp) || 466c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->time, gfp) || 467c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->avg_queue_size_sum, gfp) || 468c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->avg_queue_size_samples, gfp) || 469c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->dequeue, gfp) || 470c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->group_wait_time, gfp) || 471c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->idle_time, gfp) || 4722fc428f6SZheng Liang bfq_stat_init(&stats->empty_time, gfp)) 4732fc428f6SZheng Liang goto error; 474a33801e8SLuca Miccio #endif 475ea25da48SPaolo Valente 476ea25da48SPaolo Valente return 0; 4772fc428f6SZheng Liang 4782fc428f6SZheng Liang error: 4792fc428f6SZheng Liang bfqg_stats_exit(stats); 4802fc428f6SZheng Liang return -ENOMEM; 481ea25da48SPaolo Valente } 482ea25da48SPaolo Valente 483ea25da48SPaolo Valente static struct bfq_group_data *cpd_to_bfqgd(struct blkcg_policy_data *cpd) 484ea25da48SPaolo Valente { 485ea25da48SPaolo Valente return cpd ? container_of(cpd, struct bfq_group_data, pd) : NULL; 486ea25da48SPaolo Valente } 487ea25da48SPaolo Valente 488ea25da48SPaolo Valente static struct bfq_group_data *blkcg_to_bfqgd(struct blkcg *blkcg) 489ea25da48SPaolo Valente { 490ea25da48SPaolo Valente return cpd_to_bfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_bfq)); 491ea25da48SPaolo Valente } 492ea25da48SPaolo Valente 493dfb79af5SBart Van Assche static struct blkcg_policy_data *bfq_cpd_alloc(gfp_t gfp) 494ea25da48SPaolo Valente { 495ea25da48SPaolo Valente struct bfq_group_data *bgd; 496ea25da48SPaolo Valente 497ea25da48SPaolo Valente bgd = kzalloc(sizeof(*bgd), gfp); 498ea25da48SPaolo Valente if (!bgd) 499ea25da48SPaolo Valente return NULL; 500*650e2cb5SChengming Zhou 501*650e2cb5SChengming Zhou bgd->weight = CGROUP_WEIGHT_DFL; 502ea25da48SPaolo Valente return &bgd->pd; 503ea25da48SPaolo Valente } 504ea25da48SPaolo Valente 505dfb79af5SBart Van Assche static void bfq_cpd_free(struct blkcg_policy_data *cpd) 506ea25da48SPaolo Valente { 507ea25da48SPaolo Valente kfree(cpd_to_bfqgd(cpd)); 508ea25da48SPaolo Valente } 509ea25da48SPaolo Valente 5100a0b4f79SChristoph Hellwig static struct blkg_policy_data *bfq_pd_alloc(struct gendisk *disk, 5110a0b4f79SChristoph Hellwig struct blkcg *blkcg, gfp_t gfp) 512ea25da48SPaolo Valente { 513ea25da48SPaolo Valente struct bfq_group *bfqg; 514ea25da48SPaolo Valente 5150a0b4f79SChristoph Hellwig bfqg = kzalloc_node(sizeof(*bfqg), gfp, disk->node_id); 516ea25da48SPaolo Valente if (!bfqg) 517ea25da48SPaolo Valente return NULL; 518ea25da48SPaolo Valente 519ea25da48SPaolo Valente if (bfqg_stats_init(&bfqg->stats, gfp)) { 520ea25da48SPaolo Valente kfree(bfqg); 521ea25da48SPaolo Valente return NULL; 522ea25da48SPaolo Valente } 523ea25da48SPaolo Valente 5248f9bebc3SPaolo Valente /* see comments in bfq_bic_update_cgroup for why refcounting */ 525216f7647SYu Kuai refcount_set(&bfqg->ref, 1); 526ea25da48SPaolo Valente return &bfqg->pd; 527ea25da48SPaolo Valente } 528ea25da48SPaolo Valente 529dfb79af5SBart Van Assche static void bfq_pd_init(struct blkg_policy_data *pd) 530ea25da48SPaolo Valente { 531ea25da48SPaolo Valente struct blkcg_gq *blkg = pd_to_blkg(pd); 532ea25da48SPaolo Valente struct bfq_group *bfqg = blkg_to_bfqg(blkg); 533ea25da48SPaolo Valente struct bfq_data *bfqd = blkg->q->elevator->elevator_data; 534ea25da48SPaolo Valente struct bfq_entity *entity = &bfqg->entity; 535ea25da48SPaolo Valente struct bfq_group_data *d = blkcg_to_bfqgd(blkg->blkcg); 536ea25da48SPaolo Valente 537ea25da48SPaolo Valente entity->orig_weight = entity->weight = entity->new_weight = d->weight; 538ea25da48SPaolo Valente entity->my_sched_data = &bfqg->sched_data; 539430a67f9SPaolo Valente entity->last_bfqq_created = NULL; 540430a67f9SPaolo Valente 541ea25da48SPaolo Valente bfqg->my_entity = entity; /* 542ea25da48SPaolo Valente * the root_group's will be set to NULL 543ea25da48SPaolo Valente * in bfq_init_queue() 544ea25da48SPaolo Valente */ 545ea25da48SPaolo Valente bfqg->bfqd = bfqd; 546ea25da48SPaolo Valente bfqg->active_entities = 0; 54760a6e10cSYu Kuai bfqg->num_queues_with_pending_reqs = 0; 548ea25da48SPaolo Valente bfqg->rq_pos_tree = RB_ROOT; 549ea25da48SPaolo Valente } 550ea25da48SPaolo Valente 551dfb79af5SBart Van Assche static void bfq_pd_free(struct blkg_policy_data *pd) 552ea25da48SPaolo Valente { 553ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 554ea25da48SPaolo Valente 555ea25da48SPaolo Valente bfqg_stats_exit(&bfqg->stats); 5568f9bebc3SPaolo Valente bfqg_put(bfqg); 557ea25da48SPaolo Valente } 558ea25da48SPaolo Valente 559dfb79af5SBart Van Assche static void bfq_pd_reset_stats(struct blkg_policy_data *pd) 560ea25da48SPaolo Valente { 561ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 562ea25da48SPaolo Valente 563ea25da48SPaolo Valente bfqg_stats_reset(&bfqg->stats); 564ea25da48SPaolo Valente } 565ea25da48SPaolo Valente 566ea25da48SPaolo Valente static void bfq_group_set_parent(struct bfq_group *bfqg, 567ea25da48SPaolo Valente struct bfq_group *parent) 568ea25da48SPaolo Valente { 569ea25da48SPaolo Valente struct bfq_entity *entity; 570ea25da48SPaolo Valente 571ea25da48SPaolo Valente entity = &bfqg->entity; 572ea25da48SPaolo Valente entity->parent = parent->my_entity; 573ea25da48SPaolo Valente entity->sched_data = &parent->sched_data; 574ea25da48SPaolo Valente } 575ea25da48SPaolo Valente 5764e54a249SJan Kara static void bfq_link_bfqg(struct bfq_data *bfqd, struct bfq_group *bfqg) 577ea25da48SPaolo Valente { 5784e54a249SJan Kara struct bfq_group *parent; 579ea25da48SPaolo Valente struct bfq_entity *entity; 580ea25da48SPaolo Valente 581ea25da48SPaolo Valente /* 582ea25da48SPaolo Valente * Update chain of bfq_groups as we might be handling a leaf group 583ea25da48SPaolo Valente * which, along with some of its relatives, has not been hooked yet 584ea25da48SPaolo Valente * to the private hierarchy of BFQ. 585ea25da48SPaolo Valente */ 586ea25da48SPaolo Valente entity = &bfqg->entity; 587ea25da48SPaolo Valente for_each_entity(entity) { 58814afc593SCarlo Nonato struct bfq_group *curr_bfqg = container_of(entity, 58914afc593SCarlo Nonato struct bfq_group, entity); 59014afc593SCarlo Nonato if (curr_bfqg != bfqd->root_group) { 59114afc593SCarlo Nonato parent = bfqg_parent(curr_bfqg); 592ea25da48SPaolo Valente if (!parent) 593ea25da48SPaolo Valente parent = bfqd->root_group; 59414afc593SCarlo Nonato bfq_group_set_parent(curr_bfqg, parent); 595ea25da48SPaolo Valente } 596ea25da48SPaolo Valente } 5974e54a249SJan Kara } 598ea25da48SPaolo Valente 5994e54a249SJan Kara struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio) 6004e54a249SJan Kara { 6014e54a249SJan Kara struct blkcg_gq *blkg = bio->bi_blkg; 602075a53b7SJan Kara struct bfq_group *bfqg; 6034e54a249SJan Kara 604075a53b7SJan Kara while (blkg) { 605f02be900SYu Kuai if (!blkg->online) { 606f02be900SYu Kuai blkg = blkg->parent; 607f02be900SYu Kuai continue; 608f02be900SYu Kuai } 609075a53b7SJan Kara bfqg = blkg_to_bfqg(blkg); 610f37bf75cSYu Kuai if (bfqg->pd.online) { 611075a53b7SJan Kara bio_associate_blkg_from_css(bio, &blkg->blkcg->css); 612075a53b7SJan Kara return bfqg; 613075a53b7SJan Kara } 614075a53b7SJan Kara blkg = blkg->parent; 615075a53b7SJan Kara } 616075a53b7SJan Kara bio_associate_blkg_from_css(bio, 617075a53b7SJan Kara &bfqg_to_blkg(bfqd->root_group)->blkcg->css); 6184e54a249SJan Kara return bfqd->root_group; 619ea25da48SPaolo Valente } 620ea25da48SPaolo Valente 621ea25da48SPaolo Valente /** 622ea25da48SPaolo Valente * bfq_bfqq_move - migrate @bfqq to @bfqg. 623ea25da48SPaolo Valente * @bfqd: queue descriptor. 624ea25da48SPaolo Valente * @bfqq: the queue to move. 625ea25da48SPaolo Valente * @bfqg: the group to move to. 626ea25da48SPaolo Valente * 627ea25da48SPaolo Valente * Move @bfqq to @bfqg, deactivating it from its old group and reactivating 628ea25da48SPaolo Valente * it on the new one. Avoid putting the entity on the old group idle tree. 629ea25da48SPaolo Valente * 6308f9bebc3SPaolo Valente * Must be called under the scheduler lock, to make sure that the blkg 6318f9bebc3SPaolo Valente * owning @bfqg does not disappear (see comments in 6328f9bebc3SPaolo Valente * bfq_bic_update_cgroup on guaranteeing the consistency of blkg 6338f9bebc3SPaolo Valente * objects). 634ea25da48SPaolo Valente */ 635ea25da48SPaolo Valente void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, 636ea25da48SPaolo Valente struct bfq_group *bfqg) 637ea25da48SPaolo Valente { 638ea25da48SPaolo Valente struct bfq_entity *entity = &bfqq->entity; 639c5e4cb0fSYu Kuai struct bfq_group *old_parent = bfqq_group(bfqq); 64060a6e10cSYu Kuai bool has_pending_reqs = false; 641c5e4cb0fSYu Kuai 642c5e4cb0fSYu Kuai /* 643c5e4cb0fSYu Kuai * No point to move bfqq to the same group, which can happen when 644c5e4cb0fSYu Kuai * root group is offlined 645c5e4cb0fSYu Kuai */ 646c5e4cb0fSYu Kuai if (old_parent == bfqg) 647c5e4cb0fSYu Kuai return; 648ea25da48SPaolo Valente 649fd1bb3aeSPaolo Valente /* 6508410f709SYu Kuai * oom_bfqq is not allowed to move, oom_bfqq will hold ref to root_group 6518410f709SYu Kuai * until elevator exit. 6528410f709SYu Kuai */ 6538410f709SYu Kuai if (bfqq == &bfqd->oom_bfqq) 6548410f709SYu Kuai return; 6558410f709SYu Kuai /* 656fd1bb3aeSPaolo Valente * Get extra reference to prevent bfqq from being freed in 657fd1bb3aeSPaolo Valente * next possible expire or deactivate. 658fd1bb3aeSPaolo Valente */ 659fd1bb3aeSPaolo Valente bfqq->ref++; 660fd1bb3aeSPaolo Valente 66160a6e10cSYu Kuai if (entity->in_groups_with_pending_reqs) { 66260a6e10cSYu Kuai has_pending_reqs = true; 66360a6e10cSYu Kuai bfq_del_bfqq_in_groups_with_pending_reqs(bfqq); 66460a6e10cSYu Kuai } 66560a6e10cSYu Kuai 666ea25da48SPaolo Valente /* If bfqq is empty, then bfq_bfqq_expire also invokes 667ea25da48SPaolo Valente * bfq_del_bfqq_busy, thereby removing bfqq and its entity 668ea25da48SPaolo Valente * from data structures related to current group. Otherwise we 669ea25da48SPaolo Valente * need to remove bfqq explicitly with bfq_deactivate_bfqq, as 670ea25da48SPaolo Valente * we do below. 671ea25da48SPaolo Valente */ 672ea25da48SPaolo Valente if (bfqq == bfqd->in_service_queue) 673ea25da48SPaolo Valente bfq_bfqq_expire(bfqd, bfqd->in_service_queue, 674ea25da48SPaolo Valente false, BFQQE_PREEMPTED); 675ea25da48SPaolo Valente 676ea25da48SPaolo Valente if (bfq_bfqq_busy(bfqq)) 677ea25da48SPaolo Valente bfq_deactivate_bfqq(bfqd, bfqq, false, false); 67833a16a98SPaolo Valente else if (entity->on_st_or_in_serv) 679ea25da48SPaolo Valente bfq_put_idle_entity(bfq_entity_service_tree(entity), entity); 680c5e4cb0fSYu Kuai bfqg_and_blkg_put(old_parent); 681ea25da48SPaolo Valente 682d29bd414SPaolo Valente if (entity->parent && 683d29bd414SPaolo Valente entity->parent->last_bfqq_created == bfqq) 684d29bd414SPaolo Valente entity->parent->last_bfqq_created = NULL; 685d29bd414SPaolo Valente else if (bfqd->last_bfqq_created == bfqq) 686d29bd414SPaolo Valente bfqd->last_bfqq_created = NULL; 687d29bd414SPaolo Valente 688ea25da48SPaolo Valente entity->parent = bfqg->my_entity; 689ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 6908f9bebc3SPaolo Valente /* pin down bfqg and its associated blkg */ 6918f9bebc3SPaolo Valente bfqg_and_blkg_get(bfqg); 692ea25da48SPaolo Valente 69360a6e10cSYu Kuai if (has_pending_reqs) 69460a6e10cSYu Kuai bfq_add_bfqq_in_groups_with_pending_reqs(bfqq); 69560a6e10cSYu Kuai 696ea25da48SPaolo Valente if (bfq_bfqq_busy(bfqq)) { 6978cacc5abSPaolo Valente if (unlikely(!bfqd->nonrot_with_queueing)) 698ea25da48SPaolo Valente bfq_pos_tree_add_move(bfqd, bfqq); 699ea25da48SPaolo Valente bfq_activate_bfqq(bfqd, bfqq); 700ea25da48SPaolo Valente } 701ea25da48SPaolo Valente 7022d31c684SDavide Zini if (!bfqd->in_service_queue && !bfqd->tot_rq_in_driver) 703ea25da48SPaolo Valente bfq_schedule_dispatch(bfqd); 704fd1bb3aeSPaolo Valente /* release extra ref taken above, bfqq may happen to be freed now */ 705ecedd3d7SPaolo Valente bfq_put_queue(bfqq); 706ea25da48SPaolo Valente } 707ea25da48SPaolo Valente 7089778369aSPaolo Valente static void bfq_sync_bfqq_move(struct bfq_data *bfqd, 7099778369aSPaolo Valente struct bfq_queue *sync_bfqq, 7109778369aSPaolo Valente struct bfq_io_cq *bic, 7119778369aSPaolo Valente struct bfq_group *bfqg, 7129778369aSPaolo Valente unsigned int act_idx) 7139778369aSPaolo Valente { 7149778369aSPaolo Valente struct bfq_queue *bfqq; 7159778369aSPaolo Valente 7169778369aSPaolo Valente if (!sync_bfqq->new_bfqq && !bfq_bfqq_coop(sync_bfqq)) { 7179778369aSPaolo Valente /* We are the only user of this bfqq, just move it */ 7189778369aSPaolo Valente if (sync_bfqq->entity.sched_data != &bfqg->sched_data) 7199778369aSPaolo Valente bfq_bfqq_move(bfqd, sync_bfqq, bfqg); 7209778369aSPaolo Valente return; 7219778369aSPaolo Valente } 7229778369aSPaolo Valente 7239778369aSPaolo Valente /* 7249778369aSPaolo Valente * The queue was merged to a different queue. Check 7259778369aSPaolo Valente * that the merge chain still belongs to the same 7269778369aSPaolo Valente * cgroup. 7279778369aSPaolo Valente */ 7289778369aSPaolo Valente for (bfqq = sync_bfqq; bfqq; bfqq = bfqq->new_bfqq) 7299778369aSPaolo Valente if (bfqq->entity.sched_data != &bfqg->sched_data) 7309778369aSPaolo Valente break; 7319778369aSPaolo Valente if (bfqq) { 7329778369aSPaolo Valente /* 7339778369aSPaolo Valente * Some queue changed cgroup so the merge is not valid 7349778369aSPaolo Valente * anymore. We cannot easily just cancel the merge (by 7359778369aSPaolo Valente * clearing new_bfqq) as there may be other processes 7369778369aSPaolo Valente * using this queue and holding refs to all queues 7379778369aSPaolo Valente * below sync_bfqq->new_bfqq. Similarly if the merge 7389778369aSPaolo Valente * already happened, we need to detach from bfqq now 7399778369aSPaolo Valente * so that we cannot merge bio to a request from the 7409778369aSPaolo Valente * old cgroup. 7419778369aSPaolo Valente */ 7429778369aSPaolo Valente bfq_put_cooperator(sync_bfqq); 7439778369aSPaolo Valente bic_set_bfqq(bic, NULL, true, act_idx); 7445b0ed596SLinus Torvalds bfq_release_process_ref(bfqd, sync_bfqq); 7459778369aSPaolo Valente } 7469778369aSPaolo Valente } 7479778369aSPaolo Valente 748ea25da48SPaolo Valente /** 7491d87be82SBart Van Assche * __bfq_bic_change_cgroup - move @bic to @bfqg. 750ea25da48SPaolo Valente * @bfqd: the queue descriptor. 751ea25da48SPaolo Valente * @bic: the bic to move. 7521d87be82SBart Van Assche * @bfqg: the group to move to. 753ea25da48SPaolo Valente * 7548f9bebc3SPaolo Valente * Move bic to blkcg, assuming that bfqd->lock is held; which makes 7558f9bebc3SPaolo Valente * sure that the reference to cgroup is valid across the call (see 7568f9bebc3SPaolo Valente * comments in bfq_bic_update_cgroup on this issue) 757ea25da48SPaolo Valente */ 758452af7dcSYu Kuai static void __bfq_bic_change_cgroup(struct bfq_data *bfqd, 759ea25da48SPaolo Valente struct bfq_io_cq *bic, 7604e54a249SJan Kara struct bfq_group *bfqg) 761ea25da48SPaolo Valente { 7629778369aSPaolo Valente unsigned int act_idx; 763ea25da48SPaolo Valente 7649778369aSPaolo Valente for (act_idx = 0; act_idx < bfqd->num_actuators; act_idx++) { 7659778369aSPaolo Valente struct bfq_queue *async_bfqq = bic_to_bfqq(bic, false, act_idx); 7669778369aSPaolo Valente struct bfq_queue *sync_bfqq = bic_to_bfqq(bic, true, act_idx); 767ea25da48SPaolo Valente 7689778369aSPaolo Valente if (async_bfqq && 7699778369aSPaolo Valente async_bfqq->entity.sched_data != &bfqg->sched_data) { 7709778369aSPaolo Valente bic_set_bfqq(bic, NULL, false, act_idx); 771c8997736SPaolo Valente bfq_release_process_ref(bfqd, async_bfqq); 772ea25da48SPaolo Valente } 773ea25da48SPaolo Valente 7749778369aSPaolo Valente if (sync_bfqq) 7759778369aSPaolo Valente bfq_sync_bfqq_move(bfqd, sync_bfqq, bic, bfqg, act_idx); 776ea25da48SPaolo Valente } 777ea25da48SPaolo Valente } 778ea25da48SPaolo Valente 779ea25da48SPaolo Valente void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) 780ea25da48SPaolo Valente { 781ea25da48SPaolo Valente struct bfq_data *bfqd = bic_to_bfqd(bic); 7824e54a249SJan Kara struct bfq_group *bfqg = bfq_bio_bfqg(bfqd, bio); 783ea25da48SPaolo Valente uint64_t serial_nr; 784ea25da48SPaolo Valente 7854e54a249SJan Kara serial_nr = bfqg_to_blkg(bfqg)->blkcg->css.serial_nr; 786ea25da48SPaolo Valente 787ea25da48SPaolo Valente /* 788ea25da48SPaolo Valente * Check whether blkcg has changed. The condition may trigger 789ea25da48SPaolo Valente * spuriously on a newly created cic but there's no harm. 790ea25da48SPaolo Valente */ 791ea25da48SPaolo Valente if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr)) 7924e54a249SJan Kara return; 793ea25da48SPaolo Valente 7944e54a249SJan Kara /* 7954e54a249SJan Kara * New cgroup for this process. Make sure it is linked to bfq internal 7964e54a249SJan Kara * cgroup hierarchy. 7974e54a249SJan Kara */ 7984e54a249SJan Kara bfq_link_bfqg(bfqd, bfqg); 7994e54a249SJan Kara __bfq_bic_change_cgroup(bfqd, bic, bfqg); 8008f9bebc3SPaolo Valente /* 8018f9bebc3SPaolo Valente * Update blkg_path for bfq_log_* functions. We cache this 8028f9bebc3SPaolo Valente * path, and update it here, for the following 8038f9bebc3SPaolo Valente * reasons. Operations on blkg objects in blk-cgroup are 8048f9bebc3SPaolo Valente * protected with the request_queue lock, and not with the 8058f9bebc3SPaolo Valente * lock that protects the instances of this scheduler 8068f9bebc3SPaolo Valente * (bfqd->lock). This exposes BFQ to the following sort of 8078f9bebc3SPaolo Valente * race. 8088f9bebc3SPaolo Valente * 8098f9bebc3SPaolo Valente * The blkg_lookup performed in bfq_get_queue, protected 8108f9bebc3SPaolo Valente * through rcu, may happen to return the address of a copy of 8118f9bebc3SPaolo Valente * the original blkg. If this is the case, then the 8128f9bebc3SPaolo Valente * bfqg_and_blkg_get performed in bfq_get_queue, to pin down 8138f9bebc3SPaolo Valente * the blkg, is useless: it does not prevent blk-cgroup code 8148f9bebc3SPaolo Valente * from destroying both the original blkg and all objects 8158f9bebc3SPaolo Valente * directly or indirectly referred by the copy of the 8168f9bebc3SPaolo Valente * blkg. 8178f9bebc3SPaolo Valente * 8188f9bebc3SPaolo Valente * On the bright side, destroy operations on a blkg invoke, as 8198f9bebc3SPaolo Valente * a first step, hooks of the scheduler associated with the 8208f9bebc3SPaolo Valente * blkg. And these hooks are executed with bfqd->lock held for 8218f9bebc3SPaolo Valente * BFQ. As a consequence, for any blkg associated with the 8228f9bebc3SPaolo Valente * request queue this instance of the scheduler is attached 8238f9bebc3SPaolo Valente * to, we are guaranteed that such a blkg is not destroyed, and 8248f9bebc3SPaolo Valente * that all the pointers it contains are consistent, while we 8258f9bebc3SPaolo Valente * are holding bfqd->lock. A blkg_lookup performed with 8268f9bebc3SPaolo Valente * bfqd->lock held then returns a fully consistent blkg, which 8278f9bebc3SPaolo Valente * remains consistent until this lock is held. 8288f9bebc3SPaolo Valente * 8298f9bebc3SPaolo Valente * Thanks to the last fact, and to the fact that: (1) bfqg has 8308f9bebc3SPaolo Valente * been obtained through a blkg_lookup in the above 8318f9bebc3SPaolo Valente * assignment, and (2) bfqd->lock is being held, here we can 8328f9bebc3SPaolo Valente * safely use the policy data for the involved blkg (i.e., the 8338f9bebc3SPaolo Valente * field bfqg->pd) to get to the blkg associated with bfqg, 8348f9bebc3SPaolo Valente * and then we can safely use any field of blkg. After we 8358f9bebc3SPaolo Valente * release bfqd->lock, even just getting blkg through this 8368f9bebc3SPaolo Valente * bfqg may cause dangling references to be traversed, as 8378f9bebc3SPaolo Valente * bfqg->pd may not exist any more. 8388f9bebc3SPaolo Valente * 8398f9bebc3SPaolo Valente * In view of the above facts, here we cache, in the bfqg, any 8408f9bebc3SPaolo Valente * blkg data we may need for this bic, and for its associated 8418f9bebc3SPaolo Valente * bfq_queue. As of now, we need to cache only the path of the 8428f9bebc3SPaolo Valente * blkg, which is used in the bfq_log_* functions. 8438f9bebc3SPaolo Valente * 8448f9bebc3SPaolo Valente * Finally, note that bfqg itself needs to be protected from 8458f9bebc3SPaolo Valente * destruction on the blkg_free of the original blkg (which 8468f9bebc3SPaolo Valente * invokes bfq_pd_free). We use an additional private 8478f9bebc3SPaolo Valente * refcounter for bfqg, to let it disappear only after no 8488f9bebc3SPaolo Valente * bfq_queue refers to it any longer. 8498f9bebc3SPaolo Valente */ 8508f9bebc3SPaolo Valente blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); 851ea25da48SPaolo Valente bic->blkcg_serial_nr = serial_nr; 852ea25da48SPaolo Valente } 853ea25da48SPaolo Valente 854ea25da48SPaolo Valente /** 855ea25da48SPaolo Valente * bfq_flush_idle_tree - deactivate any entity on the idle tree of @st. 856ea25da48SPaolo Valente * @st: the service tree being flushed. 857ea25da48SPaolo Valente */ 858ea25da48SPaolo Valente static void bfq_flush_idle_tree(struct bfq_service_tree *st) 859ea25da48SPaolo Valente { 860ea25da48SPaolo Valente struct bfq_entity *entity = st->first_idle; 861ea25da48SPaolo Valente 862ea25da48SPaolo Valente for (; entity ; entity = st->first_idle) 863ea25da48SPaolo Valente __bfq_deactivate_entity(entity, false); 864ea25da48SPaolo Valente } 865ea25da48SPaolo Valente 866ea25da48SPaolo Valente /** 867ea25da48SPaolo Valente * bfq_reparent_leaf_entity - move leaf entity to the root_group. 868ea25da48SPaolo Valente * @bfqd: the device data structure with the root group. 869576682faSPaolo Valente * @entity: the entity to move, if entity is a leaf; or the parent entity 870576682faSPaolo Valente * of an active leaf entity to move, if entity is not a leaf. 8711d87be82SBart Van Assche * @ioprio_class: I/O priority class to reparent. 872ea25da48SPaolo Valente */ 873ea25da48SPaolo Valente static void bfq_reparent_leaf_entity(struct bfq_data *bfqd, 874576682faSPaolo Valente struct bfq_entity *entity, 875576682faSPaolo Valente int ioprio_class) 876ea25da48SPaolo Valente { 877576682faSPaolo Valente struct bfq_queue *bfqq; 878576682faSPaolo Valente struct bfq_entity *child_entity = entity; 879ea25da48SPaolo Valente 880576682faSPaolo Valente while (child_entity->my_sched_data) { /* leaf not reached yet */ 881576682faSPaolo Valente struct bfq_sched_data *child_sd = child_entity->my_sched_data; 882576682faSPaolo Valente struct bfq_service_tree *child_st = child_sd->service_tree + 883576682faSPaolo Valente ioprio_class; 884576682faSPaolo Valente struct rb_root *child_active = &child_st->active; 885576682faSPaolo Valente 886576682faSPaolo Valente child_entity = bfq_entity_of(rb_first(child_active)); 887576682faSPaolo Valente 888576682faSPaolo Valente if (!child_entity) 889576682faSPaolo Valente child_entity = child_sd->in_service_entity; 890576682faSPaolo Valente } 891576682faSPaolo Valente 892576682faSPaolo Valente bfqq = bfq_entity_to_bfqq(child_entity); 893ea25da48SPaolo Valente bfq_bfqq_move(bfqd, bfqq, bfqd->root_group); 894ea25da48SPaolo Valente } 895ea25da48SPaolo Valente 896ea25da48SPaolo Valente /** 897576682faSPaolo Valente * bfq_reparent_active_queues - move to the root group all active queues. 898ea25da48SPaolo Valente * @bfqd: the device data structure with the root group. 899ea25da48SPaolo Valente * @bfqg: the group to move from. 900576682faSPaolo Valente * @st: the service tree to start the search from. 9011d87be82SBart Van Assche * @ioprio_class: I/O priority class to reparent. 902ea25da48SPaolo Valente */ 903576682faSPaolo Valente static void bfq_reparent_active_queues(struct bfq_data *bfqd, 904ea25da48SPaolo Valente struct bfq_group *bfqg, 905576682faSPaolo Valente struct bfq_service_tree *st, 906576682faSPaolo Valente int ioprio_class) 907ea25da48SPaolo Valente { 908ea25da48SPaolo Valente struct rb_root *active = &st->active; 909576682faSPaolo Valente struct bfq_entity *entity; 910ea25da48SPaolo Valente 911576682faSPaolo Valente while ((entity = bfq_entity_of(rb_first(active)))) 912576682faSPaolo Valente bfq_reparent_leaf_entity(bfqd, entity, ioprio_class); 913ea25da48SPaolo Valente 914ea25da48SPaolo Valente if (bfqg->sched_data.in_service_entity) 915ea25da48SPaolo Valente bfq_reparent_leaf_entity(bfqd, 916576682faSPaolo Valente bfqg->sched_data.in_service_entity, 917576682faSPaolo Valente ioprio_class); 918ea25da48SPaolo Valente } 919ea25da48SPaolo Valente 920ea25da48SPaolo Valente /** 921ea25da48SPaolo Valente * bfq_pd_offline - deactivate the entity associated with @pd, 922ea25da48SPaolo Valente * and reparent its children entities. 923ea25da48SPaolo Valente * @pd: descriptor of the policy going offline. 924ea25da48SPaolo Valente * 925ea25da48SPaolo Valente * blkio already grabs the queue_lock for us, so no need to use 926ea25da48SPaolo Valente * RCU-based magic 927ea25da48SPaolo Valente */ 928dfb79af5SBart Van Assche static void bfq_pd_offline(struct blkg_policy_data *pd) 929ea25da48SPaolo Valente { 930ea25da48SPaolo Valente struct bfq_service_tree *st; 931ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 932ea25da48SPaolo Valente struct bfq_data *bfqd = bfqg->bfqd; 933ea25da48SPaolo Valente struct bfq_entity *entity = bfqg->my_entity; 934ea25da48SPaolo Valente unsigned long flags; 935ea25da48SPaolo Valente int i; 936ea25da48SPaolo Valente 937ea25da48SPaolo Valente spin_lock_irqsave(&bfqd->lock, flags); 93852257ffbSPaolo Valente 93952257ffbSPaolo Valente if (!entity) /* root group */ 94052257ffbSPaolo Valente goto put_async_queues; 94152257ffbSPaolo Valente 942ea25da48SPaolo Valente /* 943ea25da48SPaolo Valente * Empty all service_trees belonging to this group before 944ea25da48SPaolo Valente * deactivating the group itself. 945ea25da48SPaolo Valente */ 946ea25da48SPaolo Valente for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) { 947ea25da48SPaolo Valente st = bfqg->sched_data.service_tree + i; 948ea25da48SPaolo Valente 949ea25da48SPaolo Valente /* 950ea25da48SPaolo Valente * It may happen that some queues are still active 951ea25da48SPaolo Valente * (busy) upon group destruction (if the corresponding 952ea25da48SPaolo Valente * processes have been forced to terminate). We move 953ea25da48SPaolo Valente * all the leaf entities corresponding to these queues 954ea25da48SPaolo Valente * to the root_group. 955ea25da48SPaolo Valente * Also, it may happen that the group has an entity 956ea25da48SPaolo Valente * in service, which is disconnected from the active 957ea25da48SPaolo Valente * tree: it must be moved, too. 958ea25da48SPaolo Valente * There is no need to put the sync queues, as the 959ea25da48SPaolo Valente * scheduler has taken no reference. 960ea25da48SPaolo Valente */ 961576682faSPaolo Valente bfq_reparent_active_queues(bfqd, bfqg, st, i); 9624d38a87fSPaolo Valente 9634d38a87fSPaolo Valente /* 9644d38a87fSPaolo Valente * The idle tree may still contain bfq_queues 9654d38a87fSPaolo Valente * belonging to exited task because they never 9664d38a87fSPaolo Valente * migrated to a different cgroup from the one being 9674d38a87fSPaolo Valente * destroyed now. In addition, even 9684d38a87fSPaolo Valente * bfq_reparent_active_queues() may happen to add some 9694d38a87fSPaolo Valente * entities to the idle tree. It happens if, in some 9704d38a87fSPaolo Valente * of the calls to bfq_bfqq_move() performed by 9714d38a87fSPaolo Valente * bfq_reparent_active_queues(), the queue to move is 9724d38a87fSPaolo Valente * empty and gets expired. 9734d38a87fSPaolo Valente */ 9744d38a87fSPaolo Valente bfq_flush_idle_tree(st); 975ea25da48SPaolo Valente } 976ea25da48SPaolo Valente 977ea25da48SPaolo Valente __bfq_deactivate_entity(entity, false); 97852257ffbSPaolo Valente 97952257ffbSPaolo Valente put_async_queues: 980ea25da48SPaolo Valente bfq_put_async_queues(bfqd, bfqg); 981ea25da48SPaolo Valente 982ea25da48SPaolo Valente spin_unlock_irqrestore(&bfqd->lock, flags); 983ea25da48SPaolo Valente /* 984ea25da48SPaolo Valente * @blkg is going offline and will be ignored by 985ea25da48SPaolo Valente * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so 986ea25da48SPaolo Valente * that they don't get lost. If IOs complete after this point, the 987ea25da48SPaolo Valente * stats for them will be lost. Oh well... 988ea25da48SPaolo Valente */ 989ea25da48SPaolo Valente bfqg_stats_xfer_dead(bfqg); 990ea25da48SPaolo Valente } 991ea25da48SPaolo Valente 992ea25da48SPaolo Valente void bfq_end_wr_async(struct bfq_data *bfqd) 993ea25da48SPaolo Valente { 994ea25da48SPaolo Valente struct blkcg_gq *blkg; 995ea25da48SPaolo Valente 996ea25da48SPaolo Valente list_for_each_entry(blkg, &bfqd->queue->blkg_list, q_node) { 997ea25da48SPaolo Valente struct bfq_group *bfqg = blkg_to_bfqg(blkg); 998ea25da48SPaolo Valente 999ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqg); 1000ea25da48SPaolo Valente } 1001ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqd->root_group); 1002ea25da48SPaolo Valente } 1003ea25da48SPaolo Valente 1004795fe54cSFam Zheng static int bfq_io_show_weight_legacy(struct seq_file *sf, void *v) 1005ea25da48SPaolo Valente { 1006ea25da48SPaolo Valente struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); 1007ea25da48SPaolo Valente struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); 1008ea25da48SPaolo Valente unsigned int val = 0; 1009ea25da48SPaolo Valente 1010ea25da48SPaolo Valente if (bfqgd) 1011ea25da48SPaolo Valente val = bfqgd->weight; 1012ea25da48SPaolo Valente 1013ea25da48SPaolo Valente seq_printf(sf, "%u\n", val); 1014ea25da48SPaolo Valente 1015ea25da48SPaolo Valente return 0; 1016ea25da48SPaolo Valente } 1017ea25da48SPaolo Valente 1018795fe54cSFam Zheng static u64 bfqg_prfill_weight_device(struct seq_file *sf, 1019795fe54cSFam Zheng struct blkg_policy_data *pd, int off) 1020ea25da48SPaolo Valente { 1021795fe54cSFam Zheng struct bfq_group *bfqg = pd_to_bfqg(pd); 1022795fe54cSFam Zheng 1023795fe54cSFam Zheng if (!bfqg->entity.dev_weight) 1024795fe54cSFam Zheng return 0; 1025795fe54cSFam Zheng return __blkg_prfill_u64(sf, pd, bfqg->entity.dev_weight); 1026795fe54cSFam Zheng } 1027795fe54cSFam Zheng 1028795fe54cSFam Zheng static int bfq_io_show_weight(struct seq_file *sf, void *v) 1029795fe54cSFam Zheng { 1030795fe54cSFam Zheng struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); 1031795fe54cSFam Zheng struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); 1032795fe54cSFam Zheng 1033795fe54cSFam Zheng seq_printf(sf, "default %u\n", bfqgd->weight); 1034795fe54cSFam Zheng blkcg_print_blkgs(sf, blkcg, bfqg_prfill_weight_device, 1035795fe54cSFam Zheng &blkcg_policy_bfq, 0, false); 1036795fe54cSFam Zheng return 0; 1037795fe54cSFam Zheng } 1038795fe54cSFam Zheng 1039795fe54cSFam Zheng static void bfq_group_set_weight(struct bfq_group *bfqg, u64 weight, u64 dev_weight) 1040795fe54cSFam Zheng { 1041795fe54cSFam Zheng weight = dev_weight ?: weight; 1042795fe54cSFam Zheng 1043795fe54cSFam Zheng bfqg->entity.dev_weight = dev_weight; 1044ea25da48SPaolo Valente /* 1045ea25da48SPaolo Valente * Setting the prio_changed flag of the entity 1046ea25da48SPaolo Valente * to 1 with new_weight == weight would re-set 1047ea25da48SPaolo Valente * the value of the weight to its ioprio mapping. 1048ea25da48SPaolo Valente * Set the flag only if necessary. 1049ea25da48SPaolo Valente */ 10505ff047e3SFam Zheng if ((unsigned short)weight != bfqg->entity.new_weight) { 10515ff047e3SFam Zheng bfqg->entity.new_weight = (unsigned short)weight; 1052ea25da48SPaolo Valente /* 1053ea25da48SPaolo Valente * Make sure that the above new value has been 1054ea25da48SPaolo Valente * stored in bfqg->entity.new_weight before 1055ea25da48SPaolo Valente * setting the prio_changed flag. In fact, 1056ea25da48SPaolo Valente * this flag may be read asynchronously (in 1057ea25da48SPaolo Valente * critical sections protected by a different 1058ea25da48SPaolo Valente * lock than that held here), and finding this 1059ea25da48SPaolo Valente * flag set may cause the execution of the code 1060ea25da48SPaolo Valente * for updating parameters whose value may 1061ea25da48SPaolo Valente * depend also on bfqg->entity.new_weight (in 1062ea25da48SPaolo Valente * __bfq_entity_update_weight_prio). 1063ea25da48SPaolo Valente * This barrier makes sure that the new value 1064ea25da48SPaolo Valente * of bfqg->entity.new_weight is correctly 1065ea25da48SPaolo Valente * seen in that code. 1066ea25da48SPaolo Valente */ 1067ea25da48SPaolo Valente smp_wmb(); 1068ea25da48SPaolo Valente bfqg->entity.prio_changed = 1; 1069ea25da48SPaolo Valente } 1070ea25da48SPaolo Valente } 10715ff047e3SFam Zheng 10725ff047e3SFam Zheng static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css, 10735ff047e3SFam Zheng struct cftype *cftype, 10745ff047e3SFam Zheng u64 val) 10755ff047e3SFam Zheng { 10765ff047e3SFam Zheng struct blkcg *blkcg = css_to_blkcg(css); 10775ff047e3SFam Zheng struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); 10785ff047e3SFam Zheng struct blkcg_gq *blkg; 10795ff047e3SFam Zheng int ret = -ERANGE; 10805ff047e3SFam Zheng 10815ff047e3SFam Zheng if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT) 10825ff047e3SFam Zheng return ret; 10835ff047e3SFam Zheng 10845ff047e3SFam Zheng ret = 0; 10855ff047e3SFam Zheng spin_lock_irq(&blkcg->lock); 10865ff047e3SFam Zheng bfqgd->weight = (unsigned short)val; 10875ff047e3SFam Zheng hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { 10885ff047e3SFam Zheng struct bfq_group *bfqg = blkg_to_bfqg(blkg); 10895ff047e3SFam Zheng 10905ff047e3SFam Zheng if (bfqg) 1091795fe54cSFam Zheng bfq_group_set_weight(bfqg, val, 0); 10925ff047e3SFam Zheng } 1093ea25da48SPaolo Valente spin_unlock_irq(&blkcg->lock); 1094ea25da48SPaolo Valente 1095ea25da48SPaolo Valente return ret; 1096ea25da48SPaolo Valente } 1097ea25da48SPaolo Valente 1098795fe54cSFam Zheng static ssize_t bfq_io_set_device_weight(struct kernfs_open_file *of, 1099795fe54cSFam Zheng char *buf, size_t nbytes, 1100795fe54cSFam Zheng loff_t off) 1101795fe54cSFam Zheng { 1102795fe54cSFam Zheng int ret; 1103795fe54cSFam Zheng struct blkg_conf_ctx ctx; 1104795fe54cSFam Zheng struct blkcg *blkcg = css_to_blkcg(of_css(of)); 1105795fe54cSFam Zheng struct bfq_group *bfqg; 1106795fe54cSFam Zheng u64 v; 1107795fe54cSFam Zheng 1108795fe54cSFam Zheng ret = blkg_conf_prep(blkcg, &blkcg_policy_bfq, buf, &ctx); 1109795fe54cSFam Zheng if (ret) 1110795fe54cSFam Zheng return ret; 1111795fe54cSFam Zheng 1112795fe54cSFam Zheng if (sscanf(ctx.body, "%llu", &v) == 1) { 1113795fe54cSFam Zheng /* require "default" on dfl */ 1114795fe54cSFam Zheng ret = -ERANGE; 1115795fe54cSFam Zheng if (!v) 1116795fe54cSFam Zheng goto out; 1117795fe54cSFam Zheng } else if (!strcmp(strim(ctx.body), "default")) { 1118795fe54cSFam Zheng v = 0; 1119795fe54cSFam Zheng } else { 1120795fe54cSFam Zheng ret = -EINVAL; 1121795fe54cSFam Zheng goto out; 1122795fe54cSFam Zheng } 1123795fe54cSFam Zheng 1124795fe54cSFam Zheng bfqg = blkg_to_bfqg(ctx.blkg); 1125795fe54cSFam Zheng 1126795fe54cSFam Zheng ret = -ERANGE; 1127795fe54cSFam Zheng if (!v || (v >= BFQ_MIN_WEIGHT && v <= BFQ_MAX_WEIGHT)) { 1128795fe54cSFam Zheng bfq_group_set_weight(bfqg, bfqg->entity.weight, v); 1129795fe54cSFam Zheng ret = 0; 1130795fe54cSFam Zheng } 1131795fe54cSFam Zheng out: 1132795fe54cSFam Zheng blkg_conf_finish(&ctx); 1133795fe54cSFam Zheng return ret ?: nbytes; 1134795fe54cSFam Zheng } 1135795fe54cSFam Zheng 1136ea25da48SPaolo Valente static ssize_t bfq_io_set_weight(struct kernfs_open_file *of, 1137ea25da48SPaolo Valente char *buf, size_t nbytes, 1138ea25da48SPaolo Valente loff_t off) 1139ea25da48SPaolo Valente { 1140795fe54cSFam Zheng char *endp; 1141795fe54cSFam Zheng int ret; 1142795fe54cSFam Zheng u64 v; 1143ea25da48SPaolo Valente 1144795fe54cSFam Zheng buf = strim(buf); 1145ea25da48SPaolo Valente 1146795fe54cSFam Zheng /* "WEIGHT" or "default WEIGHT" sets the default weight */ 1147795fe54cSFam Zheng v = simple_strtoull(buf, &endp, 0); 1148795fe54cSFam Zheng if (*endp == '\0' || sscanf(buf, "default %llu", &v) == 1) { 1149795fe54cSFam Zheng ret = bfq_io_set_weight_legacy(of_css(of), NULL, v); 1150fc8ebd01SMaciej S. Szmigiero return ret ?: nbytes; 1151ea25da48SPaolo Valente } 1152ea25da48SPaolo Valente 1153795fe54cSFam Zheng return bfq_io_set_device_weight(of, buf, nbytes, off); 1154795fe54cSFam Zheng } 1155795fe54cSFam Zheng 1156ea25da48SPaolo Valente static int bfqg_print_rwstat(struct seq_file *sf, void *v) 1157ea25da48SPaolo Valente { 1158ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, 1159ea25da48SPaolo Valente &blkcg_policy_bfq, seq_cft(sf)->private, true); 1160ea25da48SPaolo Valente return 0; 1161ea25da48SPaolo Valente } 1162ea25da48SPaolo Valente 1163a557f1c7STejun Heo static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf, 1164a557f1c7STejun Heo struct blkg_policy_data *pd, int off) 1165a557f1c7STejun Heo { 1166a557f1c7STejun Heo struct blkg_rwstat_sample sum; 1167a557f1c7STejun Heo 1168a557f1c7STejun Heo blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_bfq, off, &sum); 1169a557f1c7STejun Heo return __blkg_prfill_rwstat(sf, pd, &sum); 1170a557f1c7STejun Heo } 1171a557f1c7STejun Heo 1172a557f1c7STejun Heo static int bfqg_print_rwstat_recursive(struct seq_file *sf, void *v) 1173a557f1c7STejun Heo { 1174a557f1c7STejun Heo blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1175a557f1c7STejun Heo bfqg_prfill_rwstat_recursive, &blkcg_policy_bfq, 1176a557f1c7STejun Heo seq_cft(sf)->private, true); 1177a557f1c7STejun Heo return 0; 1178a557f1c7STejun Heo } 1179a557f1c7STejun Heo 1180fd41e603STejun Heo #ifdef CONFIG_BFQ_CGROUP_DEBUG 1181a557f1c7STejun Heo static int bfqg_print_stat(struct seq_file *sf, void *v) 1182a557f1c7STejun Heo { 1183a557f1c7STejun Heo blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat, 1184a557f1c7STejun Heo &blkcg_policy_bfq, seq_cft(sf)->private, false); 1185a557f1c7STejun Heo return 0; 1186a557f1c7STejun Heo } 1187a557f1c7STejun Heo 1188ea25da48SPaolo Valente static u64 bfqg_prfill_stat_recursive(struct seq_file *sf, 1189ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1190ea25da48SPaolo Valente { 1191d6258980SChristoph Hellwig struct blkcg_gq *blkg = pd_to_blkg(pd); 1192d6258980SChristoph Hellwig struct blkcg_gq *pos_blkg; 1193d6258980SChristoph Hellwig struct cgroup_subsys_state *pos_css; 1194d6258980SChristoph Hellwig u64 sum = 0; 1195d6258980SChristoph Hellwig 1196d6258980SChristoph Hellwig lockdep_assert_held(&blkg->q->queue_lock); 1197d6258980SChristoph Hellwig 1198d6258980SChristoph Hellwig rcu_read_lock(); 1199d6258980SChristoph Hellwig blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) { 1200d6258980SChristoph Hellwig struct bfq_stat *stat; 1201d6258980SChristoph Hellwig 1202d6258980SChristoph Hellwig if (!pos_blkg->online) 1203d6258980SChristoph Hellwig continue; 1204d6258980SChristoph Hellwig 1205d6258980SChristoph Hellwig stat = (void *)blkg_to_pd(pos_blkg, &blkcg_policy_bfq) + off; 1206d6258980SChristoph Hellwig sum += bfq_stat_read(stat) + atomic64_read(&stat->aux_cnt); 1207d6258980SChristoph Hellwig } 1208d6258980SChristoph Hellwig rcu_read_unlock(); 1209d6258980SChristoph Hellwig 1210ea25da48SPaolo Valente return __blkg_prfill_u64(sf, pd, sum); 1211ea25da48SPaolo Valente } 1212ea25da48SPaolo Valente 1213ea25da48SPaolo Valente static int bfqg_print_stat_recursive(struct seq_file *sf, void *v) 1214ea25da48SPaolo Valente { 1215ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1216ea25da48SPaolo Valente bfqg_prfill_stat_recursive, &blkcg_policy_bfq, 1217ea25da48SPaolo Valente seq_cft(sf)->private, false); 1218ea25da48SPaolo Valente return 0; 1219ea25da48SPaolo Valente } 1220ea25da48SPaolo Valente 1221ea25da48SPaolo Valente static u64 bfqg_prfill_sectors(struct seq_file *sf, struct blkg_policy_data *pd, 1222ea25da48SPaolo Valente int off) 1223ea25da48SPaolo Valente { 1224fd41e603STejun Heo struct bfq_group *bfqg = blkg_to_bfqg(pd->blkg); 1225fd41e603STejun Heo u64 sum = blkg_rwstat_total(&bfqg->stats.bytes); 1226ea25da48SPaolo Valente 1227ea25da48SPaolo Valente return __blkg_prfill_u64(sf, pd, sum >> 9); 1228ea25da48SPaolo Valente } 1229ea25da48SPaolo Valente 1230ea25da48SPaolo Valente static int bfqg_print_stat_sectors(struct seq_file *sf, void *v) 1231ea25da48SPaolo Valente { 1232ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1233ea25da48SPaolo Valente bfqg_prfill_sectors, &blkcg_policy_bfq, 0, false); 1234ea25da48SPaolo Valente return 0; 1235ea25da48SPaolo Valente } 1236ea25da48SPaolo Valente 1237ea25da48SPaolo Valente static u64 bfqg_prfill_sectors_recursive(struct seq_file *sf, 1238ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1239ea25da48SPaolo Valente { 12407af6fd91SChristoph Hellwig struct blkg_rwstat_sample tmp; 12415d0b6e48SChristoph Hellwig 1242fd41e603STejun Heo blkg_rwstat_recursive_sum(pd->blkg, &blkcg_policy_bfq, 1243fd41e603STejun Heo offsetof(struct bfq_group, stats.bytes), &tmp); 1244ea25da48SPaolo Valente 12457af6fd91SChristoph Hellwig return __blkg_prfill_u64(sf, pd, 12467af6fd91SChristoph Hellwig (tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]) >> 9); 1247ea25da48SPaolo Valente } 1248ea25da48SPaolo Valente 1249ea25da48SPaolo Valente static int bfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v) 1250ea25da48SPaolo Valente { 1251ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1252ea25da48SPaolo Valente bfqg_prfill_sectors_recursive, &blkcg_policy_bfq, 0, 1253ea25da48SPaolo Valente false); 1254ea25da48SPaolo Valente return 0; 1255ea25da48SPaolo Valente } 1256ea25da48SPaolo Valente 1257ea25da48SPaolo Valente static u64 bfqg_prfill_avg_queue_size(struct seq_file *sf, 1258ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1259ea25da48SPaolo Valente { 1260ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 1261c0ce79dcSChristoph Hellwig u64 samples = bfq_stat_read(&bfqg->stats.avg_queue_size_samples); 1262ea25da48SPaolo Valente u64 v = 0; 1263ea25da48SPaolo Valente 1264ea25da48SPaolo Valente if (samples) { 1265c0ce79dcSChristoph Hellwig v = bfq_stat_read(&bfqg->stats.avg_queue_size_sum); 1266ea25da48SPaolo Valente v = div64_u64(v, samples); 1267ea25da48SPaolo Valente } 1268ea25da48SPaolo Valente __blkg_prfill_u64(sf, pd, v); 1269ea25da48SPaolo Valente return 0; 1270ea25da48SPaolo Valente } 1271ea25da48SPaolo Valente 1272ea25da48SPaolo Valente /* print avg_queue_size */ 1273ea25da48SPaolo Valente static int bfqg_print_avg_queue_size(struct seq_file *sf, void *v) 1274ea25da48SPaolo Valente { 1275ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1276ea25da48SPaolo Valente bfqg_prfill_avg_queue_size, &blkcg_policy_bfq, 1277ea25da48SPaolo Valente 0, false); 1278ea25da48SPaolo Valente return 0; 1279ea25da48SPaolo Valente } 12808060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1281ea25da48SPaolo Valente 1282ea25da48SPaolo Valente struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) 1283ea25da48SPaolo Valente { 1284ea25da48SPaolo Valente int ret; 1285ea25da48SPaolo Valente 128640e4996eSChristoph Hellwig ret = blkcg_activate_policy(bfqd->queue->disk, &blkcg_policy_bfq); 1287ea25da48SPaolo Valente if (ret) 1288ea25da48SPaolo Valente return NULL; 1289ea25da48SPaolo Valente 1290ea25da48SPaolo Valente return blkg_to_bfqg(bfqd->queue->root_blkg); 1291ea25da48SPaolo Valente } 1292ea25da48SPaolo Valente 1293ea25da48SPaolo Valente struct blkcg_policy blkcg_policy_bfq = { 1294ea25da48SPaolo Valente .dfl_cftypes = bfq_blkg_files, 1295ea25da48SPaolo Valente .legacy_cftypes = bfq_blkcg_legacy_files, 1296ea25da48SPaolo Valente 1297ea25da48SPaolo Valente .cpd_alloc_fn = bfq_cpd_alloc, 1298ea25da48SPaolo Valente .cpd_free_fn = bfq_cpd_free, 1299ea25da48SPaolo Valente 1300ea25da48SPaolo Valente .pd_alloc_fn = bfq_pd_alloc, 1301ea25da48SPaolo Valente .pd_init_fn = bfq_pd_init, 1302ea25da48SPaolo Valente .pd_offline_fn = bfq_pd_offline, 1303ea25da48SPaolo Valente .pd_free_fn = bfq_pd_free, 1304ea25da48SPaolo Valente .pd_reset_stats_fn = bfq_pd_reset_stats, 1305ea25da48SPaolo Valente }; 1306ea25da48SPaolo Valente 1307ea25da48SPaolo Valente struct cftype bfq_blkcg_legacy_files[] = { 1308ea25da48SPaolo Valente { 1309ea25da48SPaolo Valente .name = "bfq.weight", 1310cf892988SJens Axboe .flags = CFTYPE_NOT_ON_ROOT, 1311795fe54cSFam Zheng .seq_show = bfq_io_show_weight_legacy, 1312ea25da48SPaolo Valente .write_u64 = bfq_io_set_weight_legacy, 1313ea25da48SPaolo Valente }, 1314795fe54cSFam Zheng { 1315795fe54cSFam Zheng .name = "bfq.weight_device", 1316795fe54cSFam Zheng .flags = CFTYPE_NOT_ON_ROOT, 1317795fe54cSFam Zheng .seq_show = bfq_io_show_weight, 1318795fe54cSFam Zheng .write = bfq_io_set_weight, 1319795fe54cSFam Zheng }, 1320ea25da48SPaolo Valente 1321ea25da48SPaolo Valente /* statistics, covers only the tasks in the bfqg */ 1322ea25da48SPaolo Valente { 1323ea25da48SPaolo Valente .name = "bfq.io_service_bytes", 1324fd41e603STejun Heo .private = offsetof(struct bfq_group, stats.bytes), 1325fd41e603STejun Heo .seq_show = bfqg_print_rwstat, 1326ea25da48SPaolo Valente }, 1327ea25da48SPaolo Valente { 1328ea25da48SPaolo Valente .name = "bfq.io_serviced", 1329fd41e603STejun Heo .private = offsetof(struct bfq_group, stats.ios), 1330fd41e603STejun Heo .seq_show = bfqg_print_rwstat, 1331ea25da48SPaolo Valente }, 13328060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 1333a33801e8SLuca Miccio { 1334a33801e8SLuca Miccio .name = "bfq.time", 1335a33801e8SLuca Miccio .private = offsetof(struct bfq_group, stats.time), 1336a33801e8SLuca Miccio .seq_show = bfqg_print_stat, 1337a33801e8SLuca Miccio }, 1338a33801e8SLuca Miccio { 1339a33801e8SLuca Miccio .name = "bfq.sectors", 1340a33801e8SLuca Miccio .seq_show = bfqg_print_stat_sectors, 1341a33801e8SLuca Miccio }, 1342ea25da48SPaolo Valente { 1343ea25da48SPaolo Valente .name = "bfq.io_service_time", 1344ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.service_time), 1345ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1346ea25da48SPaolo Valente }, 1347ea25da48SPaolo Valente { 1348ea25da48SPaolo Valente .name = "bfq.io_wait_time", 1349ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.wait_time), 1350ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1351ea25da48SPaolo Valente }, 1352ea25da48SPaolo Valente { 1353ea25da48SPaolo Valente .name = "bfq.io_merged", 1354ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.merged), 1355ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1356ea25da48SPaolo Valente }, 1357ea25da48SPaolo Valente { 1358ea25da48SPaolo Valente .name = "bfq.io_queued", 1359ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.queued), 1360ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1361ea25da48SPaolo Valente }, 13628060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1363ea25da48SPaolo Valente 1364636b8fe8SAngelo Ruocco /* the same statistics which cover the bfqg and its descendants */ 1365ea25da48SPaolo Valente { 1366ea25da48SPaolo Valente .name = "bfq.io_service_bytes_recursive", 1367fd41e603STejun Heo .private = offsetof(struct bfq_group, stats.bytes), 1368fd41e603STejun Heo .seq_show = bfqg_print_rwstat_recursive, 1369ea25da48SPaolo Valente }, 1370ea25da48SPaolo Valente { 1371ea25da48SPaolo Valente .name = "bfq.io_serviced_recursive", 1372fd41e603STejun Heo .private = offsetof(struct bfq_group, stats.ios), 1373fd41e603STejun Heo .seq_show = bfqg_print_rwstat_recursive, 1374ea25da48SPaolo Valente }, 13758060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 1376a33801e8SLuca Miccio { 1377a33801e8SLuca Miccio .name = "bfq.time_recursive", 1378a33801e8SLuca Miccio .private = offsetof(struct bfq_group, stats.time), 1379a33801e8SLuca Miccio .seq_show = bfqg_print_stat_recursive, 1380a33801e8SLuca Miccio }, 1381a33801e8SLuca Miccio { 1382a33801e8SLuca Miccio .name = "bfq.sectors_recursive", 1383a33801e8SLuca Miccio .seq_show = bfqg_print_stat_sectors_recursive, 1384a33801e8SLuca Miccio }, 1385ea25da48SPaolo Valente { 1386ea25da48SPaolo Valente .name = "bfq.io_service_time_recursive", 1387ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.service_time), 1388ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1389ea25da48SPaolo Valente }, 1390ea25da48SPaolo Valente { 1391ea25da48SPaolo Valente .name = "bfq.io_wait_time_recursive", 1392ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.wait_time), 1393ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1394ea25da48SPaolo Valente }, 1395ea25da48SPaolo Valente { 1396ea25da48SPaolo Valente .name = "bfq.io_merged_recursive", 1397ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.merged), 1398ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1399ea25da48SPaolo Valente }, 1400ea25da48SPaolo Valente { 1401ea25da48SPaolo Valente .name = "bfq.io_queued_recursive", 1402ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.queued), 1403ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1404ea25da48SPaolo Valente }, 1405ea25da48SPaolo Valente { 1406ea25da48SPaolo Valente .name = "bfq.avg_queue_size", 1407ea25da48SPaolo Valente .seq_show = bfqg_print_avg_queue_size, 1408ea25da48SPaolo Valente }, 1409ea25da48SPaolo Valente { 1410ea25da48SPaolo Valente .name = "bfq.group_wait_time", 1411ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.group_wait_time), 1412ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1413ea25da48SPaolo Valente }, 1414ea25da48SPaolo Valente { 1415ea25da48SPaolo Valente .name = "bfq.idle_time", 1416ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.idle_time), 1417ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1418ea25da48SPaolo Valente }, 1419ea25da48SPaolo Valente { 1420ea25da48SPaolo Valente .name = "bfq.empty_time", 1421ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.empty_time), 1422ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1423ea25da48SPaolo Valente }, 1424ea25da48SPaolo Valente { 1425ea25da48SPaolo Valente .name = "bfq.dequeue", 1426ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.dequeue), 1427ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1428ea25da48SPaolo Valente }, 14298060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1430ea25da48SPaolo Valente { } /* terminate */ 1431ea25da48SPaolo Valente }; 1432ea25da48SPaolo Valente 1433ea25da48SPaolo Valente struct cftype bfq_blkg_files[] = { 1434ea25da48SPaolo Valente { 1435ea25da48SPaolo Valente .name = "bfq.weight", 1436cf892988SJens Axboe .flags = CFTYPE_NOT_ON_ROOT, 1437ea25da48SPaolo Valente .seq_show = bfq_io_show_weight, 1438ea25da48SPaolo Valente .write = bfq_io_set_weight, 1439ea25da48SPaolo Valente }, 1440ea25da48SPaolo Valente {} /* terminate */ 1441ea25da48SPaolo Valente }; 1442ea25da48SPaolo Valente 1443ea25da48SPaolo Valente #else /* CONFIG_BFQ_GROUP_IOSCHED */ 1444ea25da48SPaolo Valente 1445ea25da48SPaolo Valente void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, 1446ea25da48SPaolo Valente struct bfq_group *bfqg) {} 1447ea25da48SPaolo Valente 1448ea25da48SPaolo Valente void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) 1449ea25da48SPaolo Valente { 1450ea25da48SPaolo Valente struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 1451ea25da48SPaolo Valente 1452ea25da48SPaolo Valente entity->weight = entity->new_weight; 1453ea25da48SPaolo Valente entity->orig_weight = entity->new_weight; 1454ea25da48SPaolo Valente if (bfqq) { 1455ea25da48SPaolo Valente bfqq->ioprio = bfqq->new_ioprio; 1456ea25da48SPaolo Valente bfqq->ioprio_class = bfqq->new_ioprio_class; 1457ea25da48SPaolo Valente } 1458ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 1459ea25da48SPaolo Valente } 1460ea25da48SPaolo Valente 1461ea25da48SPaolo Valente void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) {} 1462ea25da48SPaolo Valente 1463ea25da48SPaolo Valente void bfq_end_wr_async(struct bfq_data *bfqd) 1464ea25da48SPaolo Valente { 1465ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqd->root_group); 1466ea25da48SPaolo Valente } 1467ea25da48SPaolo Valente 14684e54a249SJan Kara struct bfq_group *bfq_bio_bfqg(struct bfq_data *bfqd, struct bio *bio) 1469ea25da48SPaolo Valente { 1470ea25da48SPaolo Valente return bfqd->root_group; 1471ea25da48SPaolo Valente } 1472ea25da48SPaolo Valente 1473ea25da48SPaolo Valente struct bfq_group *bfqq_group(struct bfq_queue *bfqq) 1474ea25da48SPaolo Valente { 1475ea25da48SPaolo Valente return bfqq->bfqd->root_group; 1476ea25da48SPaolo Valente } 1477ea25da48SPaolo Valente 14784d8340d0SPaolo Valente void bfqg_and_blkg_put(struct bfq_group *bfqg) {} 14794d8340d0SPaolo Valente 1480ea25da48SPaolo Valente struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) 1481ea25da48SPaolo Valente { 1482ea25da48SPaolo Valente struct bfq_group *bfqg; 1483ea25da48SPaolo Valente int i; 1484ea25da48SPaolo Valente 1485ea25da48SPaolo Valente bfqg = kmalloc_node(sizeof(*bfqg), GFP_KERNEL | __GFP_ZERO, node); 1486ea25da48SPaolo Valente if (!bfqg) 1487ea25da48SPaolo Valente return NULL; 1488ea25da48SPaolo Valente 1489ea25da48SPaolo Valente for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) 1490ea25da48SPaolo Valente bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; 1491ea25da48SPaolo Valente 1492ea25da48SPaolo Valente return bfqg; 1493ea25da48SPaolo Valente } 1494ea25da48SPaolo Valente #endif /* CONFIG_BFQ_GROUP_IOSCHED */ 1495