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/elevator.h> 10ea25da48SPaolo Valente #include <linux/ktime.h> 11ea25da48SPaolo Valente #include <linux/rbtree.h> 12ea25da48SPaolo Valente #include <linux/ioprio.h> 13ea25da48SPaolo Valente #include <linux/sbitmap.h> 14ea25da48SPaolo Valente #include <linux/delay.h> 15ea25da48SPaolo Valente 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, 223a33801e8SLuca Miccio unsigned int op) 224a33801e8SLuca Miccio { 225a33801e8SLuca Miccio blkg_rwstat_add(&bfqg->stats.queued, op, 1); 226a33801e8SLuca Miccio bfqg_stats_end_empty_time(&bfqg->stats); 227a33801e8SLuca Miccio if (!(bfqq == ((struct bfq_data *)bfqg->bfqd)->in_service_queue)) 228a33801e8SLuca Miccio bfqg_stats_set_start_group_wait_time(bfqg, bfqq_group(bfqq)); 229a33801e8SLuca Miccio } 230a33801e8SLuca Miccio 231a33801e8SLuca Miccio void bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) 232a33801e8SLuca Miccio { 233a33801e8SLuca Miccio blkg_rwstat_add(&bfqg->stats.queued, op, -1); 234a33801e8SLuca Miccio } 235a33801e8SLuca Miccio 236a33801e8SLuca Miccio void bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) 237a33801e8SLuca Miccio { 238a33801e8SLuca Miccio blkg_rwstat_add(&bfqg->stats.merged, op, 1); 239a33801e8SLuca Miccio } 240a33801e8SLuca Miccio 24184c7afceSOmar Sandoval void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, 24284c7afceSOmar Sandoval u64 io_start_time_ns, unsigned int op) 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) 248a33801e8SLuca Miccio blkg_rwstat_add(&stats->service_time, op, 24984c7afceSOmar Sandoval now - io_start_time_ns); 25084c7afceSOmar Sandoval if (io_start_time_ns > start_time_ns) 251a33801e8SLuca Miccio blkg_rwstat_add(&stats->wait_time, op, 25284c7afceSOmar Sandoval io_start_time_ns - start_time_ns); 253a33801e8SLuca Miccio } 254a33801e8SLuca Miccio 2558060c47bSChristoph Hellwig #else /* CONFIG_BFQ_CGROUP_DEBUG */ 256a33801e8SLuca Miccio 257a33801e8SLuca Miccio void bfqg_stats_update_io_add(struct bfq_group *bfqg, struct bfq_queue *bfqq, 258a33801e8SLuca Miccio unsigned int op) { } 259a33801e8SLuca Miccio void bfqg_stats_update_io_remove(struct bfq_group *bfqg, unsigned int op) { } 260a33801e8SLuca Miccio void bfqg_stats_update_io_merged(struct bfq_group *bfqg, unsigned int op) { } 26184c7afceSOmar Sandoval void bfqg_stats_update_completion(struct bfq_group *bfqg, u64 start_time_ns, 26284c7afceSOmar Sandoval u64 io_start_time_ns, unsigned int op) { } 263a33801e8SLuca Miccio void bfqg_stats_update_dequeue(struct bfq_group *bfqg) { } 264a33801e8SLuca Miccio void bfqg_stats_set_start_empty_time(struct bfq_group *bfqg) { } 265a33801e8SLuca Miccio void bfqg_stats_update_idle_time(struct bfq_group *bfqg) { } 266a33801e8SLuca Miccio void bfqg_stats_set_start_idle_time(struct bfq_group *bfqg) { } 267a33801e8SLuca Miccio void bfqg_stats_update_avg_queue_size(struct bfq_group *bfqg) { } 268a33801e8SLuca Miccio 2698060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 270a33801e8SLuca Miccio 271a33801e8SLuca Miccio #ifdef CONFIG_BFQ_GROUP_IOSCHED 272a33801e8SLuca Miccio 273ea25da48SPaolo Valente /* 274ea25da48SPaolo Valente * blk-cgroup policy-related handlers 275ea25da48SPaolo Valente * The following functions help in converting between blk-cgroup 276ea25da48SPaolo Valente * internal structures and BFQ-specific structures. 277ea25da48SPaolo Valente */ 278ea25da48SPaolo Valente 279ea25da48SPaolo Valente static struct bfq_group *pd_to_bfqg(struct blkg_policy_data *pd) 280ea25da48SPaolo Valente { 281ea25da48SPaolo Valente return pd ? container_of(pd, struct bfq_group, pd) : NULL; 282ea25da48SPaolo Valente } 283ea25da48SPaolo Valente 284ea25da48SPaolo Valente struct blkcg_gq *bfqg_to_blkg(struct bfq_group *bfqg) 285ea25da48SPaolo Valente { 286ea25da48SPaolo Valente return pd_to_blkg(&bfqg->pd); 287ea25da48SPaolo Valente } 288ea25da48SPaolo Valente 289ea25da48SPaolo Valente static struct bfq_group *blkg_to_bfqg(struct blkcg_gq *blkg) 290ea25da48SPaolo Valente { 291ea25da48SPaolo Valente return pd_to_bfqg(blkg_to_pd(blkg, &blkcg_policy_bfq)); 292ea25da48SPaolo Valente } 293ea25da48SPaolo Valente 294ea25da48SPaolo Valente /* 295ea25da48SPaolo Valente * bfq_group handlers 296ea25da48SPaolo Valente * The following functions help in navigating the bfq_group hierarchy 297ea25da48SPaolo Valente * by allowing to find the parent of a bfq_group or the bfq_group 298ea25da48SPaolo Valente * associated to a bfq_queue. 299ea25da48SPaolo Valente */ 300ea25da48SPaolo Valente 301ea25da48SPaolo Valente static struct bfq_group *bfqg_parent(struct bfq_group *bfqg) 302ea25da48SPaolo Valente { 303ea25da48SPaolo Valente struct blkcg_gq *pblkg = bfqg_to_blkg(bfqg)->parent; 304ea25da48SPaolo Valente 305ea25da48SPaolo Valente return pblkg ? blkg_to_bfqg(pblkg) : NULL; 306ea25da48SPaolo Valente } 307ea25da48SPaolo Valente 308ea25da48SPaolo Valente struct bfq_group *bfqq_group(struct bfq_queue *bfqq) 309ea25da48SPaolo Valente { 310ea25da48SPaolo Valente struct bfq_entity *group_entity = bfqq->entity.parent; 311ea25da48SPaolo Valente 312ea25da48SPaolo Valente return group_entity ? container_of(group_entity, struct bfq_group, 313ea25da48SPaolo Valente entity) : 314ea25da48SPaolo Valente bfqq->bfqd->root_group; 315ea25da48SPaolo Valente } 316ea25da48SPaolo Valente 317ea25da48SPaolo Valente /* 318ea25da48SPaolo Valente * The following two functions handle get and put of a bfq_group by 319ea25da48SPaolo Valente * wrapping the related blk-cgroup hooks. 320ea25da48SPaolo Valente */ 321ea25da48SPaolo Valente 322ea25da48SPaolo Valente static void bfqg_get(struct bfq_group *bfqg) 323ea25da48SPaolo Valente { 3248f9bebc3SPaolo Valente bfqg->ref++; 325ea25da48SPaolo Valente } 326ea25da48SPaolo Valente 327dfb79af5SBart Van Assche static void bfqg_put(struct bfq_group *bfqg) 328ea25da48SPaolo Valente { 3298f9bebc3SPaolo Valente bfqg->ref--; 3308f9bebc3SPaolo Valente 3318f9bebc3SPaolo Valente if (bfqg->ref == 0) 3328f9bebc3SPaolo Valente kfree(bfqg); 3338f9bebc3SPaolo Valente } 3348f9bebc3SPaolo Valente 3358f9bebc3SPaolo Valente static void bfqg_and_blkg_get(struct bfq_group *bfqg) 3368f9bebc3SPaolo Valente { 3378f9bebc3SPaolo Valente /* see comments in bfq_bic_update_cgroup for why refcounting bfqg */ 3388f9bebc3SPaolo Valente bfqg_get(bfqg); 3398f9bebc3SPaolo Valente 3408f9bebc3SPaolo Valente blkg_get(bfqg_to_blkg(bfqg)); 3418f9bebc3SPaolo Valente } 3428f9bebc3SPaolo Valente 3438f9bebc3SPaolo Valente void bfqg_and_blkg_put(struct bfq_group *bfqg) 3448f9bebc3SPaolo Valente { 3458f9bebc3SPaolo Valente blkg_put(bfqg_to_blkg(bfqg)); 346d5274b3cSKonstantin Khlebnikov 347d5274b3cSKonstantin Khlebnikov bfqg_put(bfqg); 348ea25da48SPaolo Valente } 349ea25da48SPaolo Valente 350ea25da48SPaolo Valente /* @stats = 0 */ 351ea25da48SPaolo Valente static void bfqg_stats_reset(struct bfqg_stats *stats) 352ea25da48SPaolo Valente { 3538060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 354ea25da48SPaolo Valente /* queued stats shouldn't be cleared */ 355ea25da48SPaolo Valente blkg_rwstat_reset(&stats->merged); 356ea25da48SPaolo Valente blkg_rwstat_reset(&stats->service_time); 357ea25da48SPaolo Valente blkg_rwstat_reset(&stats->wait_time); 358c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->time); 359c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->avg_queue_size_sum); 360c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->avg_queue_size_samples); 361c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->dequeue); 362c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->group_wait_time); 363c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->idle_time); 364c0ce79dcSChristoph Hellwig bfq_stat_reset(&stats->empty_time); 365a33801e8SLuca Miccio #endif 366ea25da48SPaolo Valente } 367ea25da48SPaolo Valente 368ea25da48SPaolo Valente /* @to += @from */ 369ea25da48SPaolo Valente static void bfqg_stats_add_aux(struct bfqg_stats *to, struct bfqg_stats *from) 370ea25da48SPaolo Valente { 371ea25da48SPaolo Valente if (!to || !from) 372ea25da48SPaolo Valente return; 373ea25da48SPaolo Valente 3748060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 375ea25da48SPaolo Valente /* queued stats shouldn't be cleared */ 376ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->merged, &from->merged); 377ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->service_time, &from->service_time); 378ea25da48SPaolo Valente blkg_rwstat_add_aux(&to->wait_time, &from->wait_time); 379c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&from->time, &from->time); 380c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->avg_queue_size_sum, &from->avg_queue_size_sum); 381c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->avg_queue_size_samples, 382ea25da48SPaolo Valente &from->avg_queue_size_samples); 383c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->dequeue, &from->dequeue); 384c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->group_wait_time, &from->group_wait_time); 385c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->idle_time, &from->idle_time); 386c0ce79dcSChristoph Hellwig bfq_stat_add_aux(&to->empty_time, &from->empty_time); 387a33801e8SLuca Miccio #endif 388ea25da48SPaolo Valente } 389ea25da48SPaolo Valente 390ea25da48SPaolo Valente /* 391ea25da48SPaolo Valente * Transfer @bfqg's stats to its parent's aux counts so that the ancestors' 392ea25da48SPaolo Valente * recursive stats can still account for the amount used by this bfqg after 393ea25da48SPaolo Valente * it's gone. 394ea25da48SPaolo Valente */ 395ea25da48SPaolo Valente static void bfqg_stats_xfer_dead(struct bfq_group *bfqg) 396ea25da48SPaolo Valente { 397ea25da48SPaolo Valente struct bfq_group *parent; 398ea25da48SPaolo Valente 399ea25da48SPaolo Valente if (!bfqg) /* root_group */ 400ea25da48SPaolo Valente return; 401ea25da48SPaolo Valente 402ea25da48SPaolo Valente parent = bfqg_parent(bfqg); 403ea25da48SPaolo Valente 4040d945c1fSChristoph Hellwig lockdep_assert_held(&bfqg_to_blkg(bfqg)->q->queue_lock); 405ea25da48SPaolo Valente 406ea25da48SPaolo Valente if (unlikely(!parent)) 407ea25da48SPaolo Valente return; 408ea25da48SPaolo Valente 409ea25da48SPaolo Valente bfqg_stats_add_aux(&parent->stats, &bfqg->stats); 410ea25da48SPaolo Valente bfqg_stats_reset(&bfqg->stats); 411ea25da48SPaolo Valente } 412ea25da48SPaolo Valente 413ea25da48SPaolo Valente void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) 414ea25da48SPaolo Valente { 415ea25da48SPaolo Valente struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 416ea25da48SPaolo Valente 417ea25da48SPaolo Valente entity->weight = entity->new_weight; 418ea25da48SPaolo Valente entity->orig_weight = entity->new_weight; 419ea25da48SPaolo Valente if (bfqq) { 420ea25da48SPaolo Valente bfqq->ioprio = bfqq->new_ioprio; 421ea25da48SPaolo Valente bfqq->ioprio_class = bfqq->new_ioprio_class; 4228f9bebc3SPaolo Valente /* 4238f9bebc3SPaolo Valente * Make sure that bfqg and its associated blkg do not 4248f9bebc3SPaolo Valente * disappear before entity. 4258f9bebc3SPaolo Valente */ 4268f9bebc3SPaolo Valente bfqg_and_blkg_get(bfqg); 427ea25da48SPaolo Valente } 428ea25da48SPaolo Valente entity->parent = bfqg->my_entity; /* NULL for root group */ 429ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 430ea25da48SPaolo Valente } 431ea25da48SPaolo Valente 432ea25da48SPaolo Valente static void bfqg_stats_exit(struct bfqg_stats *stats) 433ea25da48SPaolo Valente { 4348060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 435ea25da48SPaolo Valente blkg_rwstat_exit(&stats->merged); 436ea25da48SPaolo Valente blkg_rwstat_exit(&stats->service_time); 437ea25da48SPaolo Valente blkg_rwstat_exit(&stats->wait_time); 438ea25da48SPaolo Valente blkg_rwstat_exit(&stats->queued); 439c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->time); 440c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->avg_queue_size_sum); 441c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->avg_queue_size_samples); 442c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->dequeue); 443c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->group_wait_time); 444c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->idle_time); 445c0ce79dcSChristoph Hellwig bfq_stat_exit(&stats->empty_time); 446a33801e8SLuca Miccio #endif 447ea25da48SPaolo Valente } 448ea25da48SPaolo Valente 449ea25da48SPaolo Valente static int bfqg_stats_init(struct bfqg_stats *stats, gfp_t gfp) 450ea25da48SPaolo Valente { 4518060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 452ea25da48SPaolo Valente if (blkg_rwstat_init(&stats->merged, gfp) || 453ea25da48SPaolo Valente blkg_rwstat_init(&stats->service_time, gfp) || 454ea25da48SPaolo Valente blkg_rwstat_init(&stats->wait_time, gfp) || 455ea25da48SPaolo Valente blkg_rwstat_init(&stats->queued, gfp) || 456c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->time, gfp) || 457c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->avg_queue_size_sum, gfp) || 458c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->avg_queue_size_samples, gfp) || 459c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->dequeue, gfp) || 460c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->group_wait_time, gfp) || 461c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->idle_time, gfp) || 462c0ce79dcSChristoph Hellwig bfq_stat_init(&stats->empty_time, gfp)) { 463ea25da48SPaolo Valente bfqg_stats_exit(stats); 464ea25da48SPaolo Valente return -ENOMEM; 465ea25da48SPaolo Valente } 466a33801e8SLuca Miccio #endif 467ea25da48SPaolo Valente 468ea25da48SPaolo Valente return 0; 469ea25da48SPaolo Valente } 470ea25da48SPaolo Valente 471ea25da48SPaolo Valente static struct bfq_group_data *cpd_to_bfqgd(struct blkcg_policy_data *cpd) 472ea25da48SPaolo Valente { 473ea25da48SPaolo Valente return cpd ? container_of(cpd, struct bfq_group_data, pd) : NULL; 474ea25da48SPaolo Valente } 475ea25da48SPaolo Valente 476ea25da48SPaolo Valente static struct bfq_group_data *blkcg_to_bfqgd(struct blkcg *blkcg) 477ea25da48SPaolo Valente { 478ea25da48SPaolo Valente return cpd_to_bfqgd(blkcg_to_cpd(blkcg, &blkcg_policy_bfq)); 479ea25da48SPaolo Valente } 480ea25da48SPaolo Valente 481dfb79af5SBart Van Assche static struct blkcg_policy_data *bfq_cpd_alloc(gfp_t gfp) 482ea25da48SPaolo Valente { 483ea25da48SPaolo Valente struct bfq_group_data *bgd; 484ea25da48SPaolo Valente 485ea25da48SPaolo Valente bgd = kzalloc(sizeof(*bgd), gfp); 486ea25da48SPaolo Valente if (!bgd) 487ea25da48SPaolo Valente return NULL; 488ea25da48SPaolo Valente return &bgd->pd; 489ea25da48SPaolo Valente } 490ea25da48SPaolo Valente 491dfb79af5SBart Van Assche static void bfq_cpd_init(struct blkcg_policy_data *cpd) 492ea25da48SPaolo Valente { 493ea25da48SPaolo Valente struct bfq_group_data *d = cpd_to_bfqgd(cpd); 494ea25da48SPaolo Valente 495ea25da48SPaolo Valente d->weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ? 496ea25da48SPaolo Valente CGROUP_WEIGHT_DFL : BFQ_WEIGHT_LEGACY_DFL; 497ea25da48SPaolo Valente } 498ea25da48SPaolo Valente 499dfb79af5SBart Van Assche static void bfq_cpd_free(struct blkcg_policy_data *cpd) 500ea25da48SPaolo Valente { 501ea25da48SPaolo Valente kfree(cpd_to_bfqgd(cpd)); 502ea25da48SPaolo Valente } 503ea25da48SPaolo Valente 504cf09a8eeSTejun Heo static struct blkg_policy_data *bfq_pd_alloc(gfp_t gfp, struct request_queue *q, 505cf09a8eeSTejun Heo struct blkcg *blkcg) 506ea25da48SPaolo Valente { 507ea25da48SPaolo Valente struct bfq_group *bfqg; 508ea25da48SPaolo Valente 509cf09a8eeSTejun Heo bfqg = kzalloc_node(sizeof(*bfqg), gfp, q->node); 510ea25da48SPaolo Valente if (!bfqg) 511ea25da48SPaolo Valente return NULL; 512ea25da48SPaolo Valente 513ea25da48SPaolo Valente if (bfqg_stats_init(&bfqg->stats, gfp)) { 514ea25da48SPaolo Valente kfree(bfqg); 515ea25da48SPaolo Valente return NULL; 516ea25da48SPaolo Valente } 517ea25da48SPaolo Valente 5188f9bebc3SPaolo Valente /* see comments in bfq_bic_update_cgroup for why refcounting */ 5198f9bebc3SPaolo Valente bfqg_get(bfqg); 520ea25da48SPaolo Valente return &bfqg->pd; 521ea25da48SPaolo Valente } 522ea25da48SPaolo Valente 523dfb79af5SBart Van Assche static void bfq_pd_init(struct blkg_policy_data *pd) 524ea25da48SPaolo Valente { 525ea25da48SPaolo Valente struct blkcg_gq *blkg = pd_to_blkg(pd); 526ea25da48SPaolo Valente struct bfq_group *bfqg = blkg_to_bfqg(blkg); 527ea25da48SPaolo Valente struct bfq_data *bfqd = blkg->q->elevator->elevator_data; 528ea25da48SPaolo Valente struct bfq_entity *entity = &bfqg->entity; 529ea25da48SPaolo Valente struct bfq_group_data *d = blkcg_to_bfqgd(blkg->blkcg); 530ea25da48SPaolo Valente 531ea25da48SPaolo Valente entity->orig_weight = entity->weight = entity->new_weight = d->weight; 532ea25da48SPaolo Valente entity->my_sched_data = &bfqg->sched_data; 533ea25da48SPaolo Valente bfqg->my_entity = entity; /* 534ea25da48SPaolo Valente * the root_group's will be set to NULL 535ea25da48SPaolo Valente * in bfq_init_queue() 536ea25da48SPaolo Valente */ 537ea25da48SPaolo Valente bfqg->bfqd = bfqd; 538ea25da48SPaolo Valente bfqg->active_entities = 0; 539ea25da48SPaolo Valente bfqg->rq_pos_tree = RB_ROOT; 540ea25da48SPaolo Valente } 541ea25da48SPaolo Valente 542dfb79af5SBart Van Assche static void bfq_pd_free(struct blkg_policy_data *pd) 543ea25da48SPaolo Valente { 544ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 545ea25da48SPaolo Valente 546ea25da48SPaolo Valente bfqg_stats_exit(&bfqg->stats); 5478f9bebc3SPaolo Valente bfqg_put(bfqg); 548ea25da48SPaolo Valente } 549ea25da48SPaolo Valente 550dfb79af5SBart Van Assche static void bfq_pd_reset_stats(struct blkg_policy_data *pd) 551ea25da48SPaolo Valente { 552ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 553ea25da48SPaolo Valente 554ea25da48SPaolo Valente bfqg_stats_reset(&bfqg->stats); 555ea25da48SPaolo Valente } 556ea25da48SPaolo Valente 557ea25da48SPaolo Valente static void bfq_group_set_parent(struct bfq_group *bfqg, 558ea25da48SPaolo Valente struct bfq_group *parent) 559ea25da48SPaolo Valente { 560ea25da48SPaolo Valente struct bfq_entity *entity; 561ea25da48SPaolo Valente 562ea25da48SPaolo Valente entity = &bfqg->entity; 563ea25da48SPaolo Valente entity->parent = parent->my_entity; 564ea25da48SPaolo Valente entity->sched_data = &parent->sched_data; 565ea25da48SPaolo Valente } 566ea25da48SPaolo Valente 567ea25da48SPaolo Valente static struct bfq_group *bfq_lookup_bfqg(struct bfq_data *bfqd, 568ea25da48SPaolo Valente struct blkcg *blkcg) 569ea25da48SPaolo Valente { 570ea25da48SPaolo Valente struct blkcg_gq *blkg; 571ea25da48SPaolo Valente 572ea25da48SPaolo Valente blkg = blkg_lookup(blkcg, bfqd->queue); 573ea25da48SPaolo Valente if (likely(blkg)) 574ea25da48SPaolo Valente return blkg_to_bfqg(blkg); 575ea25da48SPaolo Valente return NULL; 576ea25da48SPaolo Valente } 577ea25da48SPaolo Valente 578ea25da48SPaolo Valente struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd, 579ea25da48SPaolo Valente struct blkcg *blkcg) 580ea25da48SPaolo Valente { 581ea25da48SPaolo Valente struct bfq_group *bfqg, *parent; 582ea25da48SPaolo Valente struct bfq_entity *entity; 583ea25da48SPaolo Valente 584ea25da48SPaolo Valente bfqg = bfq_lookup_bfqg(bfqd, blkcg); 585ea25da48SPaolo Valente 586ea25da48SPaolo Valente if (unlikely(!bfqg)) 587ea25da48SPaolo Valente return NULL; 588ea25da48SPaolo Valente 589ea25da48SPaolo Valente /* 590ea25da48SPaolo Valente * Update chain of bfq_groups as we might be handling a leaf group 591ea25da48SPaolo Valente * which, along with some of its relatives, has not been hooked yet 592ea25da48SPaolo Valente * to the private hierarchy of BFQ. 593ea25da48SPaolo Valente */ 594ea25da48SPaolo Valente entity = &bfqg->entity; 595ea25da48SPaolo Valente for_each_entity(entity) { 596ea25da48SPaolo Valente bfqg = container_of(entity, struct bfq_group, entity); 597ea25da48SPaolo Valente if (bfqg != bfqd->root_group) { 598ea25da48SPaolo Valente parent = bfqg_parent(bfqg); 599ea25da48SPaolo Valente if (!parent) 600ea25da48SPaolo Valente parent = bfqd->root_group; 601ea25da48SPaolo Valente bfq_group_set_parent(bfqg, parent); 602ea25da48SPaolo Valente } 603ea25da48SPaolo Valente } 604ea25da48SPaolo Valente 605ea25da48SPaolo Valente return bfqg; 606ea25da48SPaolo Valente } 607ea25da48SPaolo Valente 608ea25da48SPaolo Valente /** 609ea25da48SPaolo Valente * bfq_bfqq_move - migrate @bfqq to @bfqg. 610ea25da48SPaolo Valente * @bfqd: queue descriptor. 611ea25da48SPaolo Valente * @bfqq: the queue to move. 612ea25da48SPaolo Valente * @bfqg: the group to move to. 613ea25da48SPaolo Valente * 614ea25da48SPaolo Valente * Move @bfqq to @bfqg, deactivating it from its old group and reactivating 615ea25da48SPaolo Valente * it on the new one. Avoid putting the entity on the old group idle tree. 616ea25da48SPaolo Valente * 6178f9bebc3SPaolo Valente * Must be called under the scheduler lock, to make sure that the blkg 6188f9bebc3SPaolo Valente * owning @bfqg does not disappear (see comments in 6198f9bebc3SPaolo Valente * bfq_bic_update_cgroup on guaranteeing the consistency of blkg 6208f9bebc3SPaolo Valente * objects). 621ea25da48SPaolo Valente */ 622ea25da48SPaolo Valente void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, 623ea25da48SPaolo Valente struct bfq_group *bfqg) 624ea25da48SPaolo Valente { 625ea25da48SPaolo Valente struct bfq_entity *entity = &bfqq->entity; 626ea25da48SPaolo Valente 627ea25da48SPaolo Valente /* If bfqq is empty, then bfq_bfqq_expire also invokes 628ea25da48SPaolo Valente * bfq_del_bfqq_busy, thereby removing bfqq and its entity 629ea25da48SPaolo Valente * from data structures related to current group. Otherwise we 630ea25da48SPaolo Valente * need to remove bfqq explicitly with bfq_deactivate_bfqq, as 631ea25da48SPaolo Valente * we do below. 632ea25da48SPaolo Valente */ 633ea25da48SPaolo Valente if (bfqq == bfqd->in_service_queue) 634ea25da48SPaolo Valente bfq_bfqq_expire(bfqd, bfqd->in_service_queue, 635ea25da48SPaolo Valente false, BFQQE_PREEMPTED); 636ea25da48SPaolo Valente 637ea25da48SPaolo Valente if (bfq_bfqq_busy(bfqq)) 638ea25da48SPaolo Valente bfq_deactivate_bfqq(bfqd, bfqq, false, false); 639ea25da48SPaolo Valente else if (entity->on_st) 640ea25da48SPaolo Valente bfq_put_idle_entity(bfq_entity_service_tree(entity), entity); 6418f9bebc3SPaolo Valente bfqg_and_blkg_put(bfqq_group(bfqq)); 642ea25da48SPaolo Valente 643ea25da48SPaolo Valente entity->parent = bfqg->my_entity; 644ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 6458f9bebc3SPaolo Valente /* pin down bfqg and its associated blkg */ 6468f9bebc3SPaolo Valente bfqg_and_blkg_get(bfqg); 647ea25da48SPaolo Valente 648ea25da48SPaolo Valente if (bfq_bfqq_busy(bfqq)) { 6498cacc5abSPaolo Valente if (unlikely(!bfqd->nonrot_with_queueing)) 650ea25da48SPaolo Valente bfq_pos_tree_add_move(bfqd, bfqq); 651ea25da48SPaolo Valente bfq_activate_bfqq(bfqd, bfqq); 652ea25da48SPaolo Valente } 653ea25da48SPaolo Valente 654ea25da48SPaolo Valente if (!bfqd->in_service_queue && !bfqd->rq_in_driver) 655ea25da48SPaolo Valente bfq_schedule_dispatch(bfqd); 656ea25da48SPaolo Valente } 657ea25da48SPaolo Valente 658ea25da48SPaolo Valente /** 659ea25da48SPaolo Valente * __bfq_bic_change_cgroup - move @bic to @cgroup. 660ea25da48SPaolo Valente * @bfqd: the queue descriptor. 661ea25da48SPaolo Valente * @bic: the bic to move. 662ea25da48SPaolo Valente * @blkcg: the blk-cgroup to move to. 663ea25da48SPaolo Valente * 6648f9bebc3SPaolo Valente * Move bic to blkcg, assuming that bfqd->lock is held; which makes 6658f9bebc3SPaolo Valente * sure that the reference to cgroup is valid across the call (see 6668f9bebc3SPaolo Valente * comments in bfq_bic_update_cgroup on this issue) 667ea25da48SPaolo Valente * 668ea25da48SPaolo Valente * NOTE: an alternative approach might have been to store the current 669ea25da48SPaolo Valente * cgroup in bfqq and getting a reference to it, reducing the lookup 670ea25da48SPaolo Valente * time here, at the price of slightly more complex code. 671ea25da48SPaolo Valente */ 672ea25da48SPaolo Valente static struct bfq_group *__bfq_bic_change_cgroup(struct bfq_data *bfqd, 673ea25da48SPaolo Valente struct bfq_io_cq *bic, 674ea25da48SPaolo Valente struct blkcg *blkcg) 675ea25da48SPaolo Valente { 676ea25da48SPaolo Valente struct bfq_queue *async_bfqq = bic_to_bfqq(bic, 0); 677ea25da48SPaolo Valente struct bfq_queue *sync_bfqq = bic_to_bfqq(bic, 1); 678ea25da48SPaolo Valente struct bfq_group *bfqg; 679ea25da48SPaolo Valente struct bfq_entity *entity; 680ea25da48SPaolo Valente 681ea25da48SPaolo Valente bfqg = bfq_find_set_group(bfqd, blkcg); 682ea25da48SPaolo Valente 683ea25da48SPaolo Valente if (unlikely(!bfqg)) 684ea25da48SPaolo Valente bfqg = bfqd->root_group; 685ea25da48SPaolo Valente 686ea25da48SPaolo Valente if (async_bfqq) { 687ea25da48SPaolo Valente entity = &async_bfqq->entity; 688ea25da48SPaolo Valente 689ea25da48SPaolo Valente if (entity->sched_data != &bfqg->sched_data) { 690ea25da48SPaolo Valente bic_set_bfqq(bic, NULL, 0); 691ea25da48SPaolo Valente bfq_log_bfqq(bfqd, async_bfqq, 692ea25da48SPaolo Valente "bic_change_group: %p %d", 693ea25da48SPaolo Valente async_bfqq, async_bfqq->ref); 694ea25da48SPaolo Valente bfq_put_queue(async_bfqq); 695ea25da48SPaolo Valente } 696ea25da48SPaolo Valente } 697ea25da48SPaolo Valente 698ea25da48SPaolo Valente if (sync_bfqq) { 699ea25da48SPaolo Valente entity = &sync_bfqq->entity; 700ea25da48SPaolo Valente if (entity->sched_data != &bfqg->sched_data) 701ea25da48SPaolo Valente bfq_bfqq_move(bfqd, sync_bfqq, bfqg); 702ea25da48SPaolo Valente } 703ea25da48SPaolo Valente 704ea25da48SPaolo Valente return bfqg; 705ea25da48SPaolo Valente } 706ea25da48SPaolo Valente 707ea25da48SPaolo Valente void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) 708ea25da48SPaolo Valente { 709ea25da48SPaolo Valente struct bfq_data *bfqd = bic_to_bfqd(bic); 710ea25da48SPaolo Valente struct bfq_group *bfqg = NULL; 711ea25da48SPaolo Valente uint64_t serial_nr; 712ea25da48SPaolo Valente 713ea25da48SPaolo Valente rcu_read_lock(); 7140fe061b9SDennis Zhou serial_nr = __bio_blkcg(bio)->css.serial_nr; 715ea25da48SPaolo Valente 716ea25da48SPaolo Valente /* 717ea25da48SPaolo Valente * Check whether blkcg has changed. The condition may trigger 718ea25da48SPaolo Valente * spuriously on a newly created cic but there's no harm. 719ea25da48SPaolo Valente */ 720ea25da48SPaolo Valente if (unlikely(!bfqd) || likely(bic->blkcg_serial_nr == serial_nr)) 721ea25da48SPaolo Valente goto out; 722ea25da48SPaolo Valente 7230fe061b9SDennis Zhou bfqg = __bfq_bic_change_cgroup(bfqd, bic, __bio_blkcg(bio)); 7248f9bebc3SPaolo Valente /* 7258f9bebc3SPaolo Valente * Update blkg_path for bfq_log_* functions. We cache this 7268f9bebc3SPaolo Valente * path, and update it here, for the following 7278f9bebc3SPaolo Valente * reasons. Operations on blkg objects in blk-cgroup are 7288f9bebc3SPaolo Valente * protected with the request_queue lock, and not with the 7298f9bebc3SPaolo Valente * lock that protects the instances of this scheduler 7308f9bebc3SPaolo Valente * (bfqd->lock). This exposes BFQ to the following sort of 7318f9bebc3SPaolo Valente * race. 7328f9bebc3SPaolo Valente * 7338f9bebc3SPaolo Valente * The blkg_lookup performed in bfq_get_queue, protected 7348f9bebc3SPaolo Valente * through rcu, may happen to return the address of a copy of 7358f9bebc3SPaolo Valente * the original blkg. If this is the case, then the 7368f9bebc3SPaolo Valente * bfqg_and_blkg_get performed in bfq_get_queue, to pin down 7378f9bebc3SPaolo Valente * the blkg, is useless: it does not prevent blk-cgroup code 7388f9bebc3SPaolo Valente * from destroying both the original blkg and all objects 7398f9bebc3SPaolo Valente * directly or indirectly referred by the copy of the 7408f9bebc3SPaolo Valente * blkg. 7418f9bebc3SPaolo Valente * 7428f9bebc3SPaolo Valente * On the bright side, destroy operations on a blkg invoke, as 7438f9bebc3SPaolo Valente * a first step, hooks of the scheduler associated with the 7448f9bebc3SPaolo Valente * blkg. And these hooks are executed with bfqd->lock held for 7458f9bebc3SPaolo Valente * BFQ. As a consequence, for any blkg associated with the 7468f9bebc3SPaolo Valente * request queue this instance of the scheduler is attached 7478f9bebc3SPaolo Valente * to, we are guaranteed that such a blkg is not destroyed, and 7488f9bebc3SPaolo Valente * that all the pointers it contains are consistent, while we 7498f9bebc3SPaolo Valente * are holding bfqd->lock. A blkg_lookup performed with 7508f9bebc3SPaolo Valente * bfqd->lock held then returns a fully consistent blkg, which 7518f9bebc3SPaolo Valente * remains consistent until this lock is held. 7528f9bebc3SPaolo Valente * 7538f9bebc3SPaolo Valente * Thanks to the last fact, and to the fact that: (1) bfqg has 7548f9bebc3SPaolo Valente * been obtained through a blkg_lookup in the above 7558f9bebc3SPaolo Valente * assignment, and (2) bfqd->lock is being held, here we can 7568f9bebc3SPaolo Valente * safely use the policy data for the involved blkg (i.e., the 7578f9bebc3SPaolo Valente * field bfqg->pd) to get to the blkg associated with bfqg, 7588f9bebc3SPaolo Valente * and then we can safely use any field of blkg. After we 7598f9bebc3SPaolo Valente * release bfqd->lock, even just getting blkg through this 7608f9bebc3SPaolo Valente * bfqg may cause dangling references to be traversed, as 7618f9bebc3SPaolo Valente * bfqg->pd may not exist any more. 7628f9bebc3SPaolo Valente * 7638f9bebc3SPaolo Valente * In view of the above facts, here we cache, in the bfqg, any 7648f9bebc3SPaolo Valente * blkg data we may need for this bic, and for its associated 7658f9bebc3SPaolo Valente * bfq_queue. As of now, we need to cache only the path of the 7668f9bebc3SPaolo Valente * blkg, which is used in the bfq_log_* functions. 7678f9bebc3SPaolo Valente * 7688f9bebc3SPaolo Valente * Finally, note that bfqg itself needs to be protected from 7698f9bebc3SPaolo Valente * destruction on the blkg_free of the original blkg (which 7708f9bebc3SPaolo Valente * invokes bfq_pd_free). We use an additional private 7718f9bebc3SPaolo Valente * refcounter for bfqg, to let it disappear only after no 7728f9bebc3SPaolo Valente * bfq_queue refers to it any longer. 7738f9bebc3SPaolo Valente */ 7748f9bebc3SPaolo Valente blkg_path(bfqg_to_blkg(bfqg), bfqg->blkg_path, sizeof(bfqg->blkg_path)); 775ea25da48SPaolo Valente bic->blkcg_serial_nr = serial_nr; 776ea25da48SPaolo Valente out: 777ea25da48SPaolo Valente rcu_read_unlock(); 778ea25da48SPaolo Valente } 779ea25da48SPaolo Valente 780ea25da48SPaolo Valente /** 781ea25da48SPaolo Valente * bfq_flush_idle_tree - deactivate any entity on the idle tree of @st. 782ea25da48SPaolo Valente * @st: the service tree being flushed. 783ea25da48SPaolo Valente */ 784ea25da48SPaolo Valente static void bfq_flush_idle_tree(struct bfq_service_tree *st) 785ea25da48SPaolo Valente { 786ea25da48SPaolo Valente struct bfq_entity *entity = st->first_idle; 787ea25da48SPaolo Valente 788ea25da48SPaolo Valente for (; entity ; entity = st->first_idle) 789ea25da48SPaolo Valente __bfq_deactivate_entity(entity, false); 790ea25da48SPaolo Valente } 791ea25da48SPaolo Valente 792ea25da48SPaolo Valente /** 793ea25da48SPaolo Valente * bfq_reparent_leaf_entity - move leaf entity to the root_group. 794ea25da48SPaolo Valente * @bfqd: the device data structure with the root group. 795ea25da48SPaolo Valente * @entity: the entity to move. 796ea25da48SPaolo Valente */ 797ea25da48SPaolo Valente static void bfq_reparent_leaf_entity(struct bfq_data *bfqd, 798ea25da48SPaolo Valente struct bfq_entity *entity) 799ea25da48SPaolo Valente { 800ea25da48SPaolo Valente struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 801ea25da48SPaolo Valente 802ea25da48SPaolo Valente bfq_bfqq_move(bfqd, bfqq, bfqd->root_group); 803ea25da48SPaolo Valente } 804ea25da48SPaolo Valente 805ea25da48SPaolo Valente /** 806ea25da48SPaolo Valente * bfq_reparent_active_entities - move to the root group all active 807ea25da48SPaolo Valente * entities. 808ea25da48SPaolo Valente * @bfqd: the device data structure with the root group. 809ea25da48SPaolo Valente * @bfqg: the group to move from. 810ea25da48SPaolo Valente * @st: the service tree with the entities. 811ea25da48SPaolo Valente */ 812ea25da48SPaolo Valente static void bfq_reparent_active_entities(struct bfq_data *bfqd, 813ea25da48SPaolo Valente struct bfq_group *bfqg, 814ea25da48SPaolo Valente struct bfq_service_tree *st) 815ea25da48SPaolo Valente { 816ea25da48SPaolo Valente struct rb_root *active = &st->active; 817ea25da48SPaolo Valente struct bfq_entity *entity = NULL; 818ea25da48SPaolo Valente 819ea25da48SPaolo Valente if (!RB_EMPTY_ROOT(&st->active)) 820ea25da48SPaolo Valente entity = bfq_entity_of(rb_first(active)); 821ea25da48SPaolo Valente 822ea25da48SPaolo Valente for (; entity ; entity = bfq_entity_of(rb_first(active))) 823ea25da48SPaolo Valente bfq_reparent_leaf_entity(bfqd, entity); 824ea25da48SPaolo Valente 825ea25da48SPaolo Valente if (bfqg->sched_data.in_service_entity) 826ea25da48SPaolo Valente bfq_reparent_leaf_entity(bfqd, 827ea25da48SPaolo Valente bfqg->sched_data.in_service_entity); 828ea25da48SPaolo Valente } 829ea25da48SPaolo Valente 830ea25da48SPaolo Valente /** 831ea25da48SPaolo Valente * bfq_pd_offline - deactivate the entity associated with @pd, 832ea25da48SPaolo Valente * and reparent its children entities. 833ea25da48SPaolo Valente * @pd: descriptor of the policy going offline. 834ea25da48SPaolo Valente * 835ea25da48SPaolo Valente * blkio already grabs the queue_lock for us, so no need to use 836ea25da48SPaolo Valente * RCU-based magic 837ea25da48SPaolo Valente */ 838dfb79af5SBart Van Assche static void bfq_pd_offline(struct blkg_policy_data *pd) 839ea25da48SPaolo Valente { 840ea25da48SPaolo Valente struct bfq_service_tree *st; 841ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 842ea25da48SPaolo Valente struct bfq_data *bfqd = bfqg->bfqd; 843ea25da48SPaolo Valente struct bfq_entity *entity = bfqg->my_entity; 844ea25da48SPaolo Valente unsigned long flags; 845ea25da48SPaolo Valente int i; 846ea25da48SPaolo Valente 847ea25da48SPaolo Valente spin_lock_irqsave(&bfqd->lock, flags); 84852257ffbSPaolo Valente 84952257ffbSPaolo Valente if (!entity) /* root group */ 85052257ffbSPaolo Valente goto put_async_queues; 85152257ffbSPaolo Valente 852ea25da48SPaolo Valente /* 853ea25da48SPaolo Valente * Empty all service_trees belonging to this group before 854ea25da48SPaolo Valente * deactivating the group itself. 855ea25da48SPaolo Valente */ 856ea25da48SPaolo Valente for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) { 857ea25da48SPaolo Valente st = bfqg->sched_data.service_tree + i; 858ea25da48SPaolo Valente 859ea25da48SPaolo Valente /* 860ea25da48SPaolo Valente * The idle tree may still contain bfq_queues belonging 861ea25da48SPaolo Valente * to exited task because they never migrated to a different 8628f9bebc3SPaolo Valente * cgroup from the one being destroyed now. 863ea25da48SPaolo Valente */ 864ea25da48SPaolo Valente bfq_flush_idle_tree(st); 865ea25da48SPaolo Valente 866ea25da48SPaolo Valente /* 867ea25da48SPaolo Valente * It may happen that some queues are still active 868ea25da48SPaolo Valente * (busy) upon group destruction (if the corresponding 869ea25da48SPaolo Valente * processes have been forced to terminate). We move 870ea25da48SPaolo Valente * all the leaf entities corresponding to these queues 871ea25da48SPaolo Valente * to the root_group. 872ea25da48SPaolo Valente * Also, it may happen that the group has an entity 873ea25da48SPaolo Valente * in service, which is disconnected from the active 874ea25da48SPaolo Valente * tree: it must be moved, too. 875ea25da48SPaolo Valente * There is no need to put the sync queues, as the 876ea25da48SPaolo Valente * scheduler has taken no reference. 877ea25da48SPaolo Valente */ 878ea25da48SPaolo Valente bfq_reparent_active_entities(bfqd, bfqg, st); 879ea25da48SPaolo Valente } 880ea25da48SPaolo Valente 881ea25da48SPaolo Valente __bfq_deactivate_entity(entity, false); 88252257ffbSPaolo Valente 88352257ffbSPaolo Valente put_async_queues: 884ea25da48SPaolo Valente bfq_put_async_queues(bfqd, bfqg); 885ea25da48SPaolo Valente 886ea25da48SPaolo Valente spin_unlock_irqrestore(&bfqd->lock, flags); 887ea25da48SPaolo Valente /* 888ea25da48SPaolo Valente * @blkg is going offline and will be ignored by 889ea25da48SPaolo Valente * blkg_[rw]stat_recursive_sum(). Transfer stats to the parent so 890ea25da48SPaolo Valente * that they don't get lost. If IOs complete after this point, the 891ea25da48SPaolo Valente * stats for them will be lost. Oh well... 892ea25da48SPaolo Valente */ 893ea25da48SPaolo Valente bfqg_stats_xfer_dead(bfqg); 894ea25da48SPaolo Valente } 895ea25da48SPaolo Valente 896ea25da48SPaolo Valente void bfq_end_wr_async(struct bfq_data *bfqd) 897ea25da48SPaolo Valente { 898ea25da48SPaolo Valente struct blkcg_gq *blkg; 899ea25da48SPaolo Valente 900ea25da48SPaolo Valente list_for_each_entry(blkg, &bfqd->queue->blkg_list, q_node) { 901ea25da48SPaolo Valente struct bfq_group *bfqg = blkg_to_bfqg(blkg); 902ea25da48SPaolo Valente 903ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqg); 904ea25da48SPaolo Valente } 905ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqd->root_group); 906ea25da48SPaolo Valente } 907ea25da48SPaolo Valente 908ea25da48SPaolo Valente static int bfq_io_show_weight(struct seq_file *sf, void *v) 909ea25da48SPaolo Valente { 910ea25da48SPaolo Valente struct blkcg *blkcg = css_to_blkcg(seq_css(sf)); 911ea25da48SPaolo Valente struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); 912ea25da48SPaolo Valente unsigned int val = 0; 913ea25da48SPaolo Valente 914ea25da48SPaolo Valente if (bfqgd) 915ea25da48SPaolo Valente val = bfqgd->weight; 916ea25da48SPaolo Valente 917ea25da48SPaolo Valente seq_printf(sf, "%u\n", val); 918ea25da48SPaolo Valente 919ea25da48SPaolo Valente return 0; 920ea25da48SPaolo Valente } 921ea25da48SPaolo Valente 922ea25da48SPaolo Valente static int bfq_io_set_weight_legacy(struct cgroup_subsys_state *css, 923ea25da48SPaolo Valente struct cftype *cftype, 924ea25da48SPaolo Valente u64 val) 925ea25da48SPaolo Valente { 926ea25da48SPaolo Valente struct blkcg *blkcg = css_to_blkcg(css); 927ea25da48SPaolo Valente struct bfq_group_data *bfqgd = blkcg_to_bfqgd(blkcg); 928ea25da48SPaolo Valente struct blkcg_gq *blkg; 929ea25da48SPaolo Valente int ret = -ERANGE; 930ea25da48SPaolo Valente 931ea25da48SPaolo Valente if (val < BFQ_MIN_WEIGHT || val > BFQ_MAX_WEIGHT) 932ea25da48SPaolo Valente return ret; 933ea25da48SPaolo Valente 934ea25da48SPaolo Valente ret = 0; 935ea25da48SPaolo Valente spin_lock_irq(&blkcg->lock); 936ea25da48SPaolo Valente bfqgd->weight = (unsigned short)val; 937ea25da48SPaolo Valente hlist_for_each_entry(blkg, &blkcg->blkg_list, blkcg_node) { 938ea25da48SPaolo Valente struct bfq_group *bfqg = blkg_to_bfqg(blkg); 939ea25da48SPaolo Valente 940ea25da48SPaolo Valente if (!bfqg) 941ea25da48SPaolo Valente continue; 942ea25da48SPaolo Valente /* 943ea25da48SPaolo Valente * Setting the prio_changed flag of the entity 944ea25da48SPaolo Valente * to 1 with new_weight == weight would re-set 945ea25da48SPaolo Valente * the value of the weight to its ioprio mapping. 946ea25da48SPaolo Valente * Set the flag only if necessary. 947ea25da48SPaolo Valente */ 948ea25da48SPaolo Valente if ((unsigned short)val != bfqg->entity.new_weight) { 949ea25da48SPaolo Valente bfqg->entity.new_weight = (unsigned short)val; 950ea25da48SPaolo Valente /* 951ea25da48SPaolo Valente * Make sure that the above new value has been 952ea25da48SPaolo Valente * stored in bfqg->entity.new_weight before 953ea25da48SPaolo Valente * setting the prio_changed flag. In fact, 954ea25da48SPaolo Valente * this flag may be read asynchronously (in 955ea25da48SPaolo Valente * critical sections protected by a different 956ea25da48SPaolo Valente * lock than that held here), and finding this 957ea25da48SPaolo Valente * flag set may cause the execution of the code 958ea25da48SPaolo Valente * for updating parameters whose value may 959ea25da48SPaolo Valente * depend also on bfqg->entity.new_weight (in 960ea25da48SPaolo Valente * __bfq_entity_update_weight_prio). 961ea25da48SPaolo Valente * This barrier makes sure that the new value 962ea25da48SPaolo Valente * of bfqg->entity.new_weight is correctly 963ea25da48SPaolo Valente * seen in that code. 964ea25da48SPaolo Valente */ 965ea25da48SPaolo Valente smp_wmb(); 966ea25da48SPaolo Valente bfqg->entity.prio_changed = 1; 967ea25da48SPaolo Valente } 968ea25da48SPaolo Valente } 969ea25da48SPaolo Valente spin_unlock_irq(&blkcg->lock); 970ea25da48SPaolo Valente 971ea25da48SPaolo Valente return ret; 972ea25da48SPaolo Valente } 973ea25da48SPaolo Valente 974ea25da48SPaolo Valente static ssize_t bfq_io_set_weight(struct kernfs_open_file *of, 975ea25da48SPaolo Valente char *buf, size_t nbytes, 976ea25da48SPaolo Valente loff_t off) 977ea25da48SPaolo Valente { 978ea25da48SPaolo Valente u64 weight; 979ea25da48SPaolo Valente /* First unsigned long found in the file is used */ 980ea25da48SPaolo Valente int ret = kstrtoull(strim(buf), 0, &weight); 981ea25da48SPaolo Valente 982ea25da48SPaolo Valente if (ret) 983ea25da48SPaolo Valente return ret; 984ea25da48SPaolo Valente 985fc8ebd01SMaciej S. Szmigiero ret = bfq_io_set_weight_legacy(of_css(of), NULL, weight); 986fc8ebd01SMaciej S. Szmigiero return ret ?: nbytes; 987ea25da48SPaolo Valente } 988ea25da48SPaolo Valente 9898060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 990ea25da48SPaolo Valente static int bfqg_print_stat(struct seq_file *sf, void *v) 991ea25da48SPaolo Valente { 992ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_stat, 993ea25da48SPaolo Valente &blkcg_policy_bfq, seq_cft(sf)->private, false); 994ea25da48SPaolo Valente return 0; 995ea25da48SPaolo Valente } 996ea25da48SPaolo Valente 997ea25da48SPaolo Valente static int bfqg_print_rwstat(struct seq_file *sf, void *v) 998ea25da48SPaolo Valente { 999ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), blkg_prfill_rwstat, 1000ea25da48SPaolo Valente &blkcg_policy_bfq, seq_cft(sf)->private, true); 1001ea25da48SPaolo Valente return 0; 1002ea25da48SPaolo Valente } 1003ea25da48SPaolo Valente 1004ea25da48SPaolo Valente static u64 bfqg_prfill_stat_recursive(struct seq_file *sf, 1005ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1006ea25da48SPaolo Valente { 1007d6258980SChristoph Hellwig struct blkcg_gq *blkg = pd_to_blkg(pd); 1008d6258980SChristoph Hellwig struct blkcg_gq *pos_blkg; 1009d6258980SChristoph Hellwig struct cgroup_subsys_state *pos_css; 1010d6258980SChristoph Hellwig u64 sum = 0; 1011d6258980SChristoph Hellwig 1012d6258980SChristoph Hellwig lockdep_assert_held(&blkg->q->queue_lock); 1013d6258980SChristoph Hellwig 1014d6258980SChristoph Hellwig rcu_read_lock(); 1015d6258980SChristoph Hellwig blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) { 1016d6258980SChristoph Hellwig struct bfq_stat *stat; 1017d6258980SChristoph Hellwig 1018d6258980SChristoph Hellwig if (!pos_blkg->online) 1019d6258980SChristoph Hellwig continue; 1020d6258980SChristoph Hellwig 1021d6258980SChristoph Hellwig stat = (void *)blkg_to_pd(pos_blkg, &blkcg_policy_bfq) + off; 1022d6258980SChristoph Hellwig sum += bfq_stat_read(stat) + atomic64_read(&stat->aux_cnt); 1023d6258980SChristoph Hellwig } 1024d6258980SChristoph Hellwig rcu_read_unlock(); 1025d6258980SChristoph Hellwig 1026ea25da48SPaolo Valente return __blkg_prfill_u64(sf, pd, sum); 1027ea25da48SPaolo Valente } 1028ea25da48SPaolo Valente 1029ea25da48SPaolo Valente static u64 bfqg_prfill_rwstat_recursive(struct seq_file *sf, 1030ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1031ea25da48SPaolo Valente { 10327af6fd91SChristoph Hellwig struct blkg_rwstat_sample sum; 10335d0b6e48SChristoph Hellwig 10345d0b6e48SChristoph Hellwig blkg_rwstat_recursive_sum(pd_to_blkg(pd), &blkcg_policy_bfq, off, &sum); 1035ea25da48SPaolo Valente return __blkg_prfill_rwstat(sf, pd, &sum); 1036ea25da48SPaolo Valente } 1037ea25da48SPaolo Valente 1038ea25da48SPaolo Valente static int bfqg_print_stat_recursive(struct seq_file *sf, void *v) 1039ea25da48SPaolo Valente { 1040ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1041ea25da48SPaolo Valente bfqg_prfill_stat_recursive, &blkcg_policy_bfq, 1042ea25da48SPaolo Valente seq_cft(sf)->private, false); 1043ea25da48SPaolo Valente return 0; 1044ea25da48SPaolo Valente } 1045ea25da48SPaolo Valente 1046ea25da48SPaolo Valente static int bfqg_print_rwstat_recursive(struct seq_file *sf, void *v) 1047ea25da48SPaolo Valente { 1048ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1049ea25da48SPaolo Valente bfqg_prfill_rwstat_recursive, &blkcg_policy_bfq, 1050ea25da48SPaolo Valente seq_cft(sf)->private, true); 1051ea25da48SPaolo Valente return 0; 1052ea25da48SPaolo Valente } 1053ea25da48SPaolo Valente 1054ea25da48SPaolo Valente static u64 bfqg_prfill_sectors(struct seq_file *sf, struct blkg_policy_data *pd, 1055ea25da48SPaolo Valente int off) 1056ea25da48SPaolo Valente { 1057ea25da48SPaolo Valente u64 sum = blkg_rwstat_total(&pd->blkg->stat_bytes); 1058ea25da48SPaolo Valente 1059ea25da48SPaolo Valente return __blkg_prfill_u64(sf, pd, sum >> 9); 1060ea25da48SPaolo Valente } 1061ea25da48SPaolo Valente 1062ea25da48SPaolo Valente static int bfqg_print_stat_sectors(struct seq_file *sf, void *v) 1063ea25da48SPaolo Valente { 1064ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1065ea25da48SPaolo Valente bfqg_prfill_sectors, &blkcg_policy_bfq, 0, false); 1066ea25da48SPaolo Valente return 0; 1067ea25da48SPaolo Valente } 1068ea25da48SPaolo Valente 1069ea25da48SPaolo Valente static u64 bfqg_prfill_sectors_recursive(struct seq_file *sf, 1070ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1071ea25da48SPaolo Valente { 10727af6fd91SChristoph Hellwig struct blkg_rwstat_sample tmp; 10735d0b6e48SChristoph Hellwig 10745d0b6e48SChristoph Hellwig blkg_rwstat_recursive_sum(pd->blkg, NULL, 10755d0b6e48SChristoph Hellwig offsetof(struct blkcg_gq, stat_bytes), &tmp); 1076ea25da48SPaolo Valente 10777af6fd91SChristoph Hellwig return __blkg_prfill_u64(sf, pd, 10787af6fd91SChristoph Hellwig (tmp.cnt[BLKG_RWSTAT_READ] + tmp.cnt[BLKG_RWSTAT_WRITE]) >> 9); 1079ea25da48SPaolo Valente } 1080ea25da48SPaolo Valente 1081ea25da48SPaolo Valente static int bfqg_print_stat_sectors_recursive(struct seq_file *sf, void *v) 1082ea25da48SPaolo Valente { 1083ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1084ea25da48SPaolo Valente bfqg_prfill_sectors_recursive, &blkcg_policy_bfq, 0, 1085ea25da48SPaolo Valente false); 1086ea25da48SPaolo Valente return 0; 1087ea25da48SPaolo Valente } 1088ea25da48SPaolo Valente 1089ea25da48SPaolo Valente static u64 bfqg_prfill_avg_queue_size(struct seq_file *sf, 1090ea25da48SPaolo Valente struct blkg_policy_data *pd, int off) 1091ea25da48SPaolo Valente { 1092ea25da48SPaolo Valente struct bfq_group *bfqg = pd_to_bfqg(pd); 1093c0ce79dcSChristoph Hellwig u64 samples = bfq_stat_read(&bfqg->stats.avg_queue_size_samples); 1094ea25da48SPaolo Valente u64 v = 0; 1095ea25da48SPaolo Valente 1096ea25da48SPaolo Valente if (samples) { 1097c0ce79dcSChristoph Hellwig v = bfq_stat_read(&bfqg->stats.avg_queue_size_sum); 1098ea25da48SPaolo Valente v = div64_u64(v, samples); 1099ea25da48SPaolo Valente } 1100ea25da48SPaolo Valente __blkg_prfill_u64(sf, pd, v); 1101ea25da48SPaolo Valente return 0; 1102ea25da48SPaolo Valente } 1103ea25da48SPaolo Valente 1104ea25da48SPaolo Valente /* print avg_queue_size */ 1105ea25da48SPaolo Valente static int bfqg_print_avg_queue_size(struct seq_file *sf, void *v) 1106ea25da48SPaolo Valente { 1107ea25da48SPaolo Valente blkcg_print_blkgs(sf, css_to_blkcg(seq_css(sf)), 1108ea25da48SPaolo Valente bfqg_prfill_avg_queue_size, &blkcg_policy_bfq, 1109ea25da48SPaolo Valente 0, false); 1110ea25da48SPaolo Valente return 0; 1111ea25da48SPaolo Valente } 11128060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1113ea25da48SPaolo Valente 1114ea25da48SPaolo Valente struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) 1115ea25da48SPaolo Valente { 1116ea25da48SPaolo Valente int ret; 1117ea25da48SPaolo Valente 1118ea25da48SPaolo Valente ret = blkcg_activate_policy(bfqd->queue, &blkcg_policy_bfq); 1119ea25da48SPaolo Valente if (ret) 1120ea25da48SPaolo Valente return NULL; 1121ea25da48SPaolo Valente 1122ea25da48SPaolo Valente return blkg_to_bfqg(bfqd->queue->root_blkg); 1123ea25da48SPaolo Valente } 1124ea25da48SPaolo Valente 1125ea25da48SPaolo Valente struct blkcg_policy blkcg_policy_bfq = { 1126ea25da48SPaolo Valente .dfl_cftypes = bfq_blkg_files, 1127ea25da48SPaolo Valente .legacy_cftypes = bfq_blkcg_legacy_files, 1128ea25da48SPaolo Valente 1129ea25da48SPaolo Valente .cpd_alloc_fn = bfq_cpd_alloc, 1130ea25da48SPaolo Valente .cpd_init_fn = bfq_cpd_init, 1131ea25da48SPaolo Valente .cpd_bind_fn = bfq_cpd_init, 1132ea25da48SPaolo Valente .cpd_free_fn = bfq_cpd_free, 1133ea25da48SPaolo Valente 1134ea25da48SPaolo Valente .pd_alloc_fn = bfq_pd_alloc, 1135ea25da48SPaolo Valente .pd_init_fn = bfq_pd_init, 1136ea25da48SPaolo Valente .pd_offline_fn = bfq_pd_offline, 1137ea25da48SPaolo Valente .pd_free_fn = bfq_pd_free, 1138ea25da48SPaolo Valente .pd_reset_stats_fn = bfq_pd_reset_stats, 1139ea25da48SPaolo Valente }; 1140ea25da48SPaolo Valente 1141ea25da48SPaolo Valente struct cftype bfq_blkcg_legacy_files[] = { 1142ea25da48SPaolo Valente { 1143ea25da48SPaolo Valente .name = "bfq.weight", 1144cf892988SJens Axboe .flags = CFTYPE_NOT_ON_ROOT, 1145ea25da48SPaolo Valente .seq_show = bfq_io_show_weight, 1146ea25da48SPaolo Valente .write_u64 = bfq_io_set_weight_legacy, 1147ea25da48SPaolo Valente }, 1148ea25da48SPaolo Valente 1149ea25da48SPaolo Valente /* statistics, covers only the tasks in the bfqg */ 1150ea25da48SPaolo Valente { 1151ea25da48SPaolo Valente .name = "bfq.io_service_bytes", 1152ea25da48SPaolo Valente .private = (unsigned long)&blkcg_policy_bfq, 1153ea25da48SPaolo Valente .seq_show = blkg_print_stat_bytes, 1154ea25da48SPaolo Valente }, 1155ea25da48SPaolo Valente { 1156ea25da48SPaolo Valente .name = "bfq.io_serviced", 1157ea25da48SPaolo Valente .private = (unsigned long)&blkcg_policy_bfq, 1158ea25da48SPaolo Valente .seq_show = blkg_print_stat_ios, 1159ea25da48SPaolo Valente }, 11608060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 1161a33801e8SLuca Miccio { 1162a33801e8SLuca Miccio .name = "bfq.time", 1163a33801e8SLuca Miccio .private = offsetof(struct bfq_group, stats.time), 1164a33801e8SLuca Miccio .seq_show = bfqg_print_stat, 1165a33801e8SLuca Miccio }, 1166a33801e8SLuca Miccio { 1167a33801e8SLuca Miccio .name = "bfq.sectors", 1168a33801e8SLuca Miccio .seq_show = bfqg_print_stat_sectors, 1169a33801e8SLuca Miccio }, 1170ea25da48SPaolo Valente { 1171ea25da48SPaolo Valente .name = "bfq.io_service_time", 1172ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.service_time), 1173ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1174ea25da48SPaolo Valente }, 1175ea25da48SPaolo Valente { 1176ea25da48SPaolo Valente .name = "bfq.io_wait_time", 1177ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.wait_time), 1178ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1179ea25da48SPaolo Valente }, 1180ea25da48SPaolo Valente { 1181ea25da48SPaolo Valente .name = "bfq.io_merged", 1182ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.merged), 1183ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1184ea25da48SPaolo Valente }, 1185ea25da48SPaolo Valente { 1186ea25da48SPaolo Valente .name = "bfq.io_queued", 1187ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.queued), 1188ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat, 1189ea25da48SPaolo Valente }, 11908060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1191ea25da48SPaolo Valente 1192636b8fe8SAngelo Ruocco /* the same statistics which cover the bfqg and its descendants */ 1193ea25da48SPaolo Valente { 1194ea25da48SPaolo Valente .name = "bfq.io_service_bytes_recursive", 1195ea25da48SPaolo Valente .private = (unsigned long)&blkcg_policy_bfq, 1196ea25da48SPaolo Valente .seq_show = blkg_print_stat_bytes_recursive, 1197ea25da48SPaolo Valente }, 1198ea25da48SPaolo Valente { 1199ea25da48SPaolo Valente .name = "bfq.io_serviced_recursive", 1200ea25da48SPaolo Valente .private = (unsigned long)&blkcg_policy_bfq, 1201ea25da48SPaolo Valente .seq_show = blkg_print_stat_ios_recursive, 1202ea25da48SPaolo Valente }, 12038060c47bSChristoph Hellwig #ifdef CONFIG_BFQ_CGROUP_DEBUG 1204a33801e8SLuca Miccio { 1205a33801e8SLuca Miccio .name = "bfq.time_recursive", 1206a33801e8SLuca Miccio .private = offsetof(struct bfq_group, stats.time), 1207a33801e8SLuca Miccio .seq_show = bfqg_print_stat_recursive, 1208a33801e8SLuca Miccio }, 1209a33801e8SLuca Miccio { 1210a33801e8SLuca Miccio .name = "bfq.sectors_recursive", 1211a33801e8SLuca Miccio .seq_show = bfqg_print_stat_sectors_recursive, 1212a33801e8SLuca Miccio }, 1213ea25da48SPaolo Valente { 1214ea25da48SPaolo Valente .name = "bfq.io_service_time_recursive", 1215ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.service_time), 1216ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1217ea25da48SPaolo Valente }, 1218ea25da48SPaolo Valente { 1219ea25da48SPaolo Valente .name = "bfq.io_wait_time_recursive", 1220ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.wait_time), 1221ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1222ea25da48SPaolo Valente }, 1223ea25da48SPaolo Valente { 1224ea25da48SPaolo Valente .name = "bfq.io_merged_recursive", 1225ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.merged), 1226ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1227ea25da48SPaolo Valente }, 1228ea25da48SPaolo Valente { 1229ea25da48SPaolo Valente .name = "bfq.io_queued_recursive", 1230ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.queued), 1231ea25da48SPaolo Valente .seq_show = bfqg_print_rwstat_recursive, 1232ea25da48SPaolo Valente }, 1233ea25da48SPaolo Valente { 1234ea25da48SPaolo Valente .name = "bfq.avg_queue_size", 1235ea25da48SPaolo Valente .seq_show = bfqg_print_avg_queue_size, 1236ea25da48SPaolo Valente }, 1237ea25da48SPaolo Valente { 1238ea25da48SPaolo Valente .name = "bfq.group_wait_time", 1239ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.group_wait_time), 1240ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1241ea25da48SPaolo Valente }, 1242ea25da48SPaolo Valente { 1243ea25da48SPaolo Valente .name = "bfq.idle_time", 1244ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.idle_time), 1245ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1246ea25da48SPaolo Valente }, 1247ea25da48SPaolo Valente { 1248ea25da48SPaolo Valente .name = "bfq.empty_time", 1249ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.empty_time), 1250ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1251ea25da48SPaolo Valente }, 1252ea25da48SPaolo Valente { 1253ea25da48SPaolo Valente .name = "bfq.dequeue", 1254ea25da48SPaolo Valente .private = offsetof(struct bfq_group, stats.dequeue), 1255ea25da48SPaolo Valente .seq_show = bfqg_print_stat, 1256ea25da48SPaolo Valente }, 12578060c47bSChristoph Hellwig #endif /* CONFIG_BFQ_CGROUP_DEBUG */ 1258ea25da48SPaolo Valente { } /* terminate */ 1259ea25da48SPaolo Valente }; 1260ea25da48SPaolo Valente 1261ea25da48SPaolo Valente struct cftype bfq_blkg_files[] = { 1262ea25da48SPaolo Valente { 1263ea25da48SPaolo Valente .name = "bfq.weight", 1264cf892988SJens Axboe .flags = CFTYPE_NOT_ON_ROOT, 1265ea25da48SPaolo Valente .seq_show = bfq_io_show_weight, 1266ea25da48SPaolo Valente .write = bfq_io_set_weight, 1267ea25da48SPaolo Valente }, 1268ea25da48SPaolo Valente {} /* terminate */ 1269ea25da48SPaolo Valente }; 1270ea25da48SPaolo Valente 1271ea25da48SPaolo Valente #else /* CONFIG_BFQ_GROUP_IOSCHED */ 1272ea25da48SPaolo Valente 1273ea25da48SPaolo Valente void bfq_bfqq_move(struct bfq_data *bfqd, struct bfq_queue *bfqq, 1274ea25da48SPaolo Valente struct bfq_group *bfqg) {} 1275ea25da48SPaolo Valente 1276ea25da48SPaolo Valente void bfq_init_entity(struct bfq_entity *entity, struct bfq_group *bfqg) 1277ea25da48SPaolo Valente { 1278ea25da48SPaolo Valente struct bfq_queue *bfqq = bfq_entity_to_bfqq(entity); 1279ea25da48SPaolo Valente 1280ea25da48SPaolo Valente entity->weight = entity->new_weight; 1281ea25da48SPaolo Valente entity->orig_weight = entity->new_weight; 1282ea25da48SPaolo Valente if (bfqq) { 1283ea25da48SPaolo Valente bfqq->ioprio = bfqq->new_ioprio; 1284ea25da48SPaolo Valente bfqq->ioprio_class = bfqq->new_ioprio_class; 1285ea25da48SPaolo Valente } 1286ea25da48SPaolo Valente entity->sched_data = &bfqg->sched_data; 1287ea25da48SPaolo Valente } 1288ea25da48SPaolo Valente 1289ea25da48SPaolo Valente void bfq_bic_update_cgroup(struct bfq_io_cq *bic, struct bio *bio) {} 1290ea25da48SPaolo Valente 1291ea25da48SPaolo Valente void bfq_end_wr_async(struct bfq_data *bfqd) 1292ea25da48SPaolo Valente { 1293ea25da48SPaolo Valente bfq_end_wr_async_queues(bfqd, bfqd->root_group); 1294ea25da48SPaolo Valente } 1295ea25da48SPaolo Valente 1296ea25da48SPaolo Valente struct bfq_group *bfq_find_set_group(struct bfq_data *bfqd, struct blkcg *blkcg) 1297ea25da48SPaolo Valente { 1298ea25da48SPaolo Valente return bfqd->root_group; 1299ea25da48SPaolo Valente } 1300ea25da48SPaolo Valente 1301ea25da48SPaolo Valente struct bfq_group *bfqq_group(struct bfq_queue *bfqq) 1302ea25da48SPaolo Valente { 1303ea25da48SPaolo Valente return bfqq->bfqd->root_group; 1304ea25da48SPaolo Valente } 1305ea25da48SPaolo Valente 1306ea25da48SPaolo Valente struct bfq_group *bfq_create_group_hierarchy(struct bfq_data *bfqd, int node) 1307ea25da48SPaolo Valente { 1308ea25da48SPaolo Valente struct bfq_group *bfqg; 1309ea25da48SPaolo Valente int i; 1310ea25da48SPaolo Valente 1311ea25da48SPaolo Valente bfqg = kmalloc_node(sizeof(*bfqg), GFP_KERNEL | __GFP_ZERO, node); 1312ea25da48SPaolo Valente if (!bfqg) 1313ea25da48SPaolo Valente return NULL; 1314ea25da48SPaolo Valente 1315ea25da48SPaolo Valente for (i = 0; i < BFQ_IOPRIO_CLASSES; i++) 1316ea25da48SPaolo Valente bfqg->sched_data.service_tree[i] = BFQ_SERVICE_TREE_INIT; 1317ea25da48SPaolo Valente 1318ea25da48SPaolo Valente return bfqg; 1319ea25da48SPaolo Valente } 1320ea25da48SPaolo Valente #endif /* CONFIG_BFQ_GROUP_IOSCHED */ 1321