299 static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)  in tg_bps_limit()  argument
309 	ret = tg->bps[rw][td->limit_index];  in tg_bps_limit()
313 		    tg->iops[rw][td->limit_index])  in tg_bps_limit()
319 	if (td->limit_index == LIMIT_MAX && tg->bps[rw][LIMIT_LOW] &&  in tg_bps_limit()
320 	    tg->bps[rw][LIMIT_LOW] != tg->bps[rw][LIMIT_MAX]) {  in tg_bps_limit()
323 		adjusted = throtl_adjusted_limit(tg->bps[rw][LIMIT_LOW], td);  in tg_bps_limit()
324 		ret = min(tg->bps[rw][LIMIT_MAX], adjusted);  in tg_bps_limit()
329 static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)  in tg_iops_limit()  argument
339 	ret = tg->iops[rw][td->limit_index];  in tg_iops_limit()
343 		    tg->bps[rw][td->limit_index])  in tg_iops_limit()
349 	if (td->limit_index == LIMIT_MAX && tg->iops[rw][LIMIT_LOW] &&  in tg_iops_limit()
350 	    tg->iops[rw][LIMIT_LOW] != tg->iops[rw][LIMIT_MAX]) {  in tg_iops_limit()
353 		adjusted = throtl_adjusted_limit(tg->iops[rw][LIMIT_LOW], td);  in tg_iops_limit()
356 		ret = min_t(unsigned int, tg->iops[rw][LIMIT_MAX], adjusted);  in tg_iops_limit()
495 	int rw;  in throtl_pd_alloc()  local
509 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_pd_alloc()
510 		throtl_qnode_init(&tg->qnode_on_self[rw], tg);  in throtl_pd_alloc()
511 		throtl_qnode_init(&tg->qnode_on_parent[rw], tg);  in throtl_pd_alloc()
574 	int rw;  in tg_update_has_rules()  local
576 	for (rw = READ; rw <= WRITE; rw++)  in tg_update_has_rules()
577 		tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) ||  in tg_update_has_rules()
579 			 (tg_bps_limit(tg, rw) != U64_MAX ||  in tg_update_has_rules()
580 			  tg_iops_limit(tg, rw) != UINT_MAX));  in tg_update_has_rules()
778 		bool rw, unsigned long start)  in throtl_start_new_slice_with_credit()  argument
780 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
781 	tg->io_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
783 	atomic_set(&tg->io_split_cnt[rw], 0);  in throtl_start_new_slice_with_credit()
791 	if (time_after_eq(start, tg->slice_start[rw]))  in throtl_start_new_slice_with_credit()
792 		tg->slice_start[rw] = start;  in throtl_start_new_slice_with_credit()
794 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice_with_credit()
797 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice_with_credit()
798 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice_with_credit()
801 static inline void throtl_start_new_slice(struct throtl_grp *tg, bool rw)  in throtl_start_new_slice()  argument
803 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice()
804 	tg->io_disp[rw] = 0;  in throtl_start_new_slice()
805 	tg->slice_start[rw] = jiffies;  in throtl_start_new_slice()
806 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice()
808 	atomic_set(&tg->io_split_cnt[rw], 0);  in throtl_start_new_slice()
812 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice()
813 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice()
816 static inline void throtl_set_slice_end(struct throtl_grp *tg, bool rw,  in throtl_set_slice_end()  argument
819 	tg->slice_end[rw] = roundup(jiffy_end, tg->td->throtl_slice);  in throtl_set_slice_end()
822 static inline void throtl_extend_slice(struct throtl_grp *tg, bool rw,  in throtl_extend_slice()  argument
825 	throtl_set_slice_end(tg, rw, jiffy_end);  in throtl_extend_slice()
828 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_extend_slice()
829 		   tg->slice_end[rw], jiffies);  in throtl_extend_slice()
833 static bool throtl_slice_used(struct throtl_grp *tg, bool rw)  in throtl_slice_used()  argument
835 	if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))  in throtl_slice_used()
842 static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)  in throtl_trim_slice()  argument
847 	BUG_ON(time_before(tg->slice_end[rw], tg->slice_start[rw]));  in throtl_trim_slice()
854 	if (throtl_slice_used(tg, rw))  in throtl_trim_slice()
865 	throtl_set_slice_end(tg, rw, jiffies + tg->td->throtl_slice);  in throtl_trim_slice()
867 	time_elapsed = jiffies - tg->slice_start[rw];  in throtl_trim_slice()
873 	tmp = tg_bps_limit(tg, rw) * tg->td->throtl_slice * nr_slices;  in throtl_trim_slice()
877 	io_trim = (tg_iops_limit(tg, rw) * tg->td->throtl_slice * nr_slices) /  in throtl_trim_slice()
883 	if (tg->bytes_disp[rw] >= bytes_trim)  in throtl_trim_slice()
884 		tg->bytes_disp[rw] -= bytes_trim;  in throtl_trim_slice()
886 		tg->bytes_disp[rw] = 0;  in throtl_trim_slice()
888 	if (tg->io_disp[rw] >= io_trim)  in throtl_trim_slice()
889 		tg->io_disp[rw] -= io_trim;  in throtl_trim_slice()
891 		tg->io_disp[rw] = 0;  in throtl_trim_slice()
893 	tg->slice_start[rw] += nr_slices * tg->td->throtl_slice;  in throtl_trim_slice()
897 		   rw == READ ? 'R' : 'W', nr_slices, bytes_trim, io_trim,  in throtl_trim_slice()
898 		   tg->slice_start[rw], tg->slice_end[rw], jiffies);  in throtl_trim_slice()
904 	bool rw = bio_data_dir(bio);  in tg_with_in_iops_limit()  local
915 	jiffy_elapsed = jiffies - tg->slice_start[rw];  in tg_with_in_iops_limit()
935 	if (tg->io_disp[rw] + 1 <= io_allowed) {  in tg_with_in_iops_limit()
952 	bool rw = bio_data_dir(bio);  in tg_with_in_bps_limit()  local
963 	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];  in tg_with_in_bps_limit()
975 	if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) {  in tg_with_in_bps_limit()
982 	extra_bytes = tg->bytes_disp[rw] + bio_size - bytes_allowed;  in tg_with_in_bps_limit()
1005 	bool rw = bio_data_dir(bio);  in tg_may_dispatch()  local
1007 	u64 bps_limit = tg_bps_limit(tg, rw);  in tg_may_dispatch()
1008 	u32 iops_limit = tg_iops_limit(tg, rw);  in tg_may_dispatch()
1016 	BUG_ON(tg->service_queue.nr_queued[rw] &&  in tg_may_dispatch()
1017 	       bio != throtl_peek_queued(&tg->service_queue.queued[rw]));  in tg_may_dispatch()
1033 	if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))  in tg_may_dispatch()
1034 		throtl_start_new_slice(tg, rw);  in tg_may_dispatch()
1036 		if (time_before(tg->slice_end[rw],  in tg_may_dispatch()
1038 			throtl_extend_slice(tg, rw,  in tg_may_dispatch()
1043 		tg->io_disp[rw] += atomic_xchg(&tg->io_split_cnt[rw], 0);  in tg_may_dispatch()
1057 	if (time_before(tg->slice_end[rw], jiffies + max_wait))  in tg_may_dispatch()
1058 		throtl_extend_slice(tg, rw, jiffies + max_wait);  in tg_may_dispatch()
1065 	bool rw = bio_data_dir(bio);  in throtl_charge_bio()  local
1069 	tg->bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1070 	tg->io_disp[rw]++;  in throtl_charge_bio()
1071 	tg->last_bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1072 	tg->last_io_disp[rw]++;  in throtl_charge_bio()
1097 	bool rw = bio_data_dir(bio);  in throtl_add_bio_tg()  local
1100 		qn = &tg->qnode_on_self[rw];  in throtl_add_bio_tg()
1108 	if (!sq->nr_queued[rw])  in throtl_add_bio_tg()
1111 	throtl_qnode_add_bio(bio, qn, &sq->queued[rw]);  in throtl_add_bio_tg()
1113 	sq->nr_queued[rw]++;  in throtl_add_bio_tg()
1144 					struct throtl_grp *parent_tg, bool rw)  in start_parent_slice_with_credit()  argument
1146 	if (throtl_slice_used(parent_tg, rw)) {  in start_parent_slice_with_credit()
1147 		throtl_start_new_slice_with_credit(parent_tg, rw,  in start_parent_slice_with_credit()
1148 				child_tg->slice_start[rw]);  in start_parent_slice_with_credit()
1153 static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw)  in tg_dispatch_one_bio()  argument
1167 	bio = throtl_pop_queued(&sq->queued[rw], &tg_to_put);  in tg_dispatch_one_bio()
1168 	sq->nr_queued[rw]--;  in tg_dispatch_one_bio()
1180 		throtl_add_bio_tg(bio, &tg->qnode_on_parent[rw], parent_tg);  in tg_dispatch_one_bio()
1181 		start_parent_slice_with_credit(tg, parent_tg, rw);  in tg_dispatch_one_bio()
1183 		throtl_qnode_add_bio(bio, &tg->qnode_on_parent[rw],  in tg_dispatch_one_bio()
1184 				     &parent_sq->queued[rw]);  in tg_dispatch_one_bio()
1185 		BUG_ON(tg->td->nr_queued[rw] <= 0);  in tg_dispatch_one_bio()
1186 		tg->td->nr_queued[rw]--;  in tg_dispatch_one_bio()
1189 	throtl_trim_slice(tg, rw);  in tg_dispatch_one_bio()
1355 	int rw;  in blk_throtl_dispatch_work_fn()  local
1360 	for (rw = READ; rw <= WRITE; rw++)  in blk_throtl_dispatch_work_fn()
1361 		while ((bio = throtl_pop_queued(&td_sq->queued[rw], NULL)))  in blk_throtl_dispatch_work_fn()
2113 	int i, cpu, rw;  in throtl_update_latency_buckets()  local
2124 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2126 			struct latency_bucket *tmp = &td->tmp_buckets[rw][i];  in throtl_update_latency_buckets()
2132 				bucket = per_cpu_ptr(td->latency_buckets[rw],  in throtl_update_latency_buckets()
2143 				latency[rw] = tmp->total_latency;  in throtl_update_latency_buckets()
2147 				latency[rw] /= samples;  in throtl_update_latency_buckets()
2148 				if (latency[rw] == 0)  in throtl_update_latency_buckets()
2150 				avg_latency[rw][i].latency = latency[rw];  in throtl_update_latency_buckets()
2155 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2157 			if (!avg_latency[rw][i].latency) {  in throtl_update_latency_buckets()
2158 				if (td->avg_buckets[rw][i].latency < last_latency[rw])  in throtl_update_latency_buckets()
2159 					td->avg_buckets[rw][i].latency =  in throtl_update_latency_buckets()
2160 						last_latency[rw];  in throtl_update_latency_buckets()
2164 			if (!td->avg_buckets[rw][i].valid)  in throtl_update_latency_buckets()
2165 				latency[rw] = avg_latency[rw][i].latency;  in throtl_update_latency_buckets()
2167 				latency[rw] = (td->avg_buckets[rw][i].latency * 7 +  in throtl_update_latency_buckets()
2168 					avg_latency[rw][i].latency) >> 3;  in throtl_update_latency_buckets()
2170 			td->avg_buckets[rw][i].latency = max(latency[rw],  in throtl_update_latency_buckets()
2171 				last_latency[rw]);  in throtl_update_latency_buckets()
2172 			td->avg_buckets[rw][i].valid = true;  in throtl_update_latency_buckets()
2173 			last_latency[rw] = td->avg_buckets[rw][i].latency;  in throtl_update_latency_buckets()
2197 	bool rw = bio_data_dir(bio);  in blk_throtl_charge_bio_split()  local
2200 		if (!parent->has_rules[rw])  in blk_throtl_charge_bio_split()
2203 		atomic_inc(&parent->io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2204 		atomic_inc(&parent->last_io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2218 	bool rw = bio_data_dir(bio);  in blk_throtl_bio()  local
2234 	if (!tg->has_rules[rw])  in blk_throtl_bio()
2247 		if (tg->last_low_overflow_time[rw] == 0)  in blk_throtl_bio()
2248 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2252 		if (sq->nr_queued[rw])  in blk_throtl_bio()
2257 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2279 		throtl_trim_slice(tg, rw);  in blk_throtl_bio()
2286 		qn = &tg->qnode_on_parent[rw];  in blk_throtl_bio()
2295 		   rw == READ ? 'R' : 'W',  in blk_throtl_bio()
2296 		   tg->bytes_disp[rw], bio->bi_iter.bi_size,  in blk_throtl_bio()
2297 		   tg_bps_limit(tg, rw),  in blk_throtl_bio()
2298 		   tg->io_disp[rw], tg_iops_limit(tg, rw),  in blk_throtl_bio()
2301 	tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2303 	td->nr_queued[rw]++;  in blk_throtl_bio()
2368 	int rw = bio_data_dir(bio);  in blk_throtl_bio_endio()  local
2396 		threshold = tg->td->avg_buckets[rw][bucket].latency +  in blk_throtl_bio_endio()