296 static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)  in tg_bps_limit()  argument
306 	ret = tg->bps[rw][td->limit_index];  in tg_bps_limit()
310 		    tg->iops[rw][td->limit_index])  in tg_bps_limit()
316 	if (td->limit_index == LIMIT_MAX && tg->bps[rw][LIMIT_LOW] &&  in tg_bps_limit()
317 	    tg->bps[rw][LIMIT_LOW] != tg->bps[rw][LIMIT_MAX]) {  in tg_bps_limit()
320 		adjusted = throtl_adjusted_limit(tg->bps[rw][LIMIT_LOW], td);  in tg_bps_limit()
321 		ret = min(tg->bps[rw][LIMIT_MAX], adjusted);  in tg_bps_limit()
326 static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)  in tg_iops_limit()  argument
336 	ret = tg->iops[rw][td->limit_index];  in tg_iops_limit()
340 		    tg->bps[rw][td->limit_index])  in tg_iops_limit()
346 	if (td->limit_index == LIMIT_MAX && tg->iops[rw][LIMIT_LOW] &&  in tg_iops_limit()
347 	    tg->iops[rw][LIMIT_LOW] != tg->iops[rw][LIMIT_MAX]) {  in tg_iops_limit()
350 		adjusted = throtl_adjusted_limit(tg->iops[rw][LIMIT_LOW], td);  in tg_iops_limit()
353 		ret = min_t(unsigned int, tg->iops[rw][LIMIT_MAX], adjusted);  in tg_iops_limit()
492 	int rw;  in throtl_pd_alloc()  local
506 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_pd_alloc()
507 		throtl_qnode_init(&tg->qnode_on_self[rw], tg);  in throtl_pd_alloc()
508 		throtl_qnode_init(&tg->qnode_on_parent[rw], tg);  in throtl_pd_alloc()
571 	int rw;  in tg_update_has_rules()  local
573 	for (rw = READ; rw <= WRITE; rw++)  in tg_update_has_rules()
574 		tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) ||  in tg_update_has_rules()
576 			 (tg_bps_limit(tg, rw) != U64_MAX ||  in tg_update_has_rules()
577 			  tg_iops_limit(tg, rw) != UINT_MAX));  in tg_update_has_rules()
769 		bool rw, unsigned long start)  in throtl_start_new_slice_with_credit()  argument
771 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
772 	tg->io_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
780 	if (time_after_eq(start, tg->slice_start[rw]))  in throtl_start_new_slice_with_credit()
781 		tg->slice_start[rw] = start;  in throtl_start_new_slice_with_credit()
783 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice_with_credit()
786 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice_with_credit()
787 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice_with_credit()
790 static inline void throtl_start_new_slice(struct throtl_grp *tg, bool rw)  in throtl_start_new_slice()  argument
792 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice()
793 	tg->io_disp[rw] = 0;  in throtl_start_new_slice()
794 	tg->slice_start[rw] = jiffies;  in throtl_start_new_slice()
795 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice()
798 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice()
799 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice()
802 static inline void throtl_set_slice_end(struct throtl_grp *tg, bool rw,  in throtl_set_slice_end()  argument
805 	tg->slice_end[rw] = roundup(jiffy_end, tg->td->throtl_slice);  in throtl_set_slice_end()
808 static inline void throtl_extend_slice(struct throtl_grp *tg, bool rw,  in throtl_extend_slice()  argument
811 	throtl_set_slice_end(tg, rw, jiffy_end);  in throtl_extend_slice()
814 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_extend_slice()
815 		   tg->slice_end[rw], jiffies);  in throtl_extend_slice()
819 static bool throtl_slice_used(struct throtl_grp *tg, bool rw)  in throtl_slice_used()  argument
821 	if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))  in throtl_slice_used()
828 static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)  in throtl_trim_slice()  argument
833 	BUG_ON(time_before(tg->slice_end[rw], tg->slice_start[rw]));  in throtl_trim_slice()
840 	if (throtl_slice_used(tg, rw))  in throtl_trim_slice()
851 	throtl_set_slice_end(tg, rw, jiffies + tg->td->throtl_slice);  in throtl_trim_slice()
853 	time_elapsed = jiffies - tg->slice_start[rw];  in throtl_trim_slice()
859 	tmp = tg_bps_limit(tg, rw) * tg->td->throtl_slice * nr_slices;  in throtl_trim_slice()
863 	io_trim = (tg_iops_limit(tg, rw) * tg->td->throtl_slice * nr_slices) /  in throtl_trim_slice()
869 	if (tg->bytes_disp[rw] >= bytes_trim)  in throtl_trim_slice()
870 		tg->bytes_disp[rw] -= bytes_trim;  in throtl_trim_slice()
872 		tg->bytes_disp[rw] = 0;  in throtl_trim_slice()
874 	if (tg->io_disp[rw] >= io_trim)  in throtl_trim_slice()
875 		tg->io_disp[rw] -= io_trim;  in throtl_trim_slice()
877 		tg->io_disp[rw] = 0;  in throtl_trim_slice()
879 	tg->slice_start[rw] += nr_slices * tg->td->throtl_slice;  in throtl_trim_slice()
883 		   rw == READ ? 'R' : 'W', nr_slices, bytes_trim, io_trim,  in throtl_trim_slice()
884 		   tg->slice_start[rw], tg->slice_end[rw], jiffies);  in throtl_trim_slice()
890 	bool rw = bio_data_dir(bio);  in tg_with_in_iops_limit()  local
901 	jiffy_elapsed = jiffies - tg->slice_start[rw];  in tg_with_in_iops_limit()
921 	if (tg->io_disp[rw] + 1 <= io_allowed) {  in tg_with_in_iops_limit()
938 	bool rw = bio_data_dir(bio);  in tg_with_in_bps_limit()  local
949 	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];  in tg_with_in_bps_limit()
961 	if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) {  in tg_with_in_bps_limit()
968 	extra_bytes = tg->bytes_disp[rw] + bio_size - bytes_allowed;  in tg_with_in_bps_limit()
991 	bool rw = bio_data_dir(bio);  in tg_may_dispatch()  local
993 	u64 bps_limit = tg_bps_limit(tg, rw);  in tg_may_dispatch()
994 	u32 iops_limit = tg_iops_limit(tg, rw);  in tg_may_dispatch()
1002 	BUG_ON(tg->service_queue.nr_queued[rw] &&  in tg_may_dispatch()
1003 	       bio != throtl_peek_queued(&tg->service_queue.queued[rw]));  in tg_may_dispatch()
1019 	if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))  in tg_may_dispatch()
1020 		throtl_start_new_slice(tg, rw);  in tg_may_dispatch()
1022 		if (time_before(tg->slice_end[rw],  in tg_may_dispatch()
1024 			throtl_extend_slice(tg, rw,  in tg_may_dispatch()
1040 	if (time_before(tg->slice_end[rw], jiffies + max_wait))  in tg_may_dispatch()
1041 		throtl_extend_slice(tg, rw, jiffies + max_wait);  in tg_may_dispatch()
1048 	bool rw = bio_data_dir(bio);  in throtl_charge_bio()  local
1052 	tg->bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1053 	tg->io_disp[rw]++;  in throtl_charge_bio()
1054 	tg->last_bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1055 	tg->last_io_disp[rw]++;  in throtl_charge_bio()
1080 	bool rw = bio_data_dir(bio);  in throtl_add_bio_tg()  local
1083 		qn = &tg->qnode_on_self[rw];  in throtl_add_bio_tg()
1091 	if (!sq->nr_queued[rw])  in throtl_add_bio_tg()
1094 	throtl_qnode_add_bio(bio, qn, &sq->queued[rw]);  in throtl_add_bio_tg()
1096 	sq->nr_queued[rw]++;  in throtl_add_bio_tg()
1127 					struct throtl_grp *parent_tg, bool rw)  in start_parent_slice_with_credit()  argument
1129 	if (throtl_slice_used(parent_tg, rw)) {  in start_parent_slice_with_credit()
1130 		throtl_start_new_slice_with_credit(parent_tg, rw,  in start_parent_slice_with_credit()
1131 				child_tg->slice_start[rw]);  in start_parent_slice_with_credit()
1136 static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw)  in tg_dispatch_one_bio()  argument
1150 	bio = throtl_pop_queued(&sq->queued[rw], &tg_to_put);  in tg_dispatch_one_bio()
1151 	sq->nr_queued[rw]--;  in tg_dispatch_one_bio()
1163 		throtl_add_bio_tg(bio, &tg->qnode_on_parent[rw], parent_tg);  in tg_dispatch_one_bio()
1164 		start_parent_slice_with_credit(tg, parent_tg, rw);  in tg_dispatch_one_bio()
1166 		throtl_qnode_add_bio(bio, &tg->qnode_on_parent[rw],  in tg_dispatch_one_bio()
1167 				     &parent_sq->queued[rw]);  in tg_dispatch_one_bio()
1168 		BUG_ON(tg->td->nr_queued[rw] <= 0);  in tg_dispatch_one_bio()
1169 		tg->td->nr_queued[rw]--;  in tg_dispatch_one_bio()
1172 	throtl_trim_slice(tg, rw);  in tg_dispatch_one_bio()
1338 	int rw;  in blk_throtl_dispatch_work_fn()  local
1343 	for (rw = READ; rw <= WRITE; rw++)  in blk_throtl_dispatch_work_fn()
1344 		while ((bio = throtl_pop_queued(&td_sq->queued[rw], NULL)))  in blk_throtl_dispatch_work_fn()
2094 	int i, cpu, rw;  in throtl_update_latency_buckets()  local
2105 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2107 			struct latency_bucket *tmp = &td->tmp_buckets[rw][i];  in throtl_update_latency_buckets()
2113 				bucket = per_cpu_ptr(td->latency_buckets[rw],  in throtl_update_latency_buckets()
2124 				latency[rw] = tmp->total_latency;  in throtl_update_latency_buckets()
2128 				latency[rw] /= samples;  in throtl_update_latency_buckets()
2129 				if (latency[rw] == 0)  in throtl_update_latency_buckets()
2131 				avg_latency[rw][i].latency = latency[rw];  in throtl_update_latency_buckets()
2136 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2138 			if (!avg_latency[rw][i].latency) {  in throtl_update_latency_buckets()
2139 				if (td->avg_buckets[rw][i].latency < last_latency[rw])  in throtl_update_latency_buckets()
2140 					td->avg_buckets[rw][i].latency =  in throtl_update_latency_buckets()
2141 						last_latency[rw];  in throtl_update_latency_buckets()
2145 			if (!td->avg_buckets[rw][i].valid)  in throtl_update_latency_buckets()
2146 				latency[rw] = avg_latency[rw][i].latency;  in throtl_update_latency_buckets()
2148 				latency[rw] = (td->avg_buckets[rw][i].latency * 7 +  in throtl_update_latency_buckets()
2149 					avg_latency[rw][i].latency) >> 3;  in throtl_update_latency_buckets()
2151 			td->avg_buckets[rw][i].latency = max(latency[rw],  in throtl_update_latency_buckets()
2152 				last_latency[rw]);  in throtl_update_latency_buckets()
2153 			td->avg_buckets[rw][i].valid = true;  in throtl_update_latency_buckets()
2154 			last_latency[rw] = td->avg_buckets[rw][i].latency;  in throtl_update_latency_buckets()
2180 	bool rw = bio_data_dir(bio);  in blk_throtl_bio()  local
2196 	if (!tg->has_rules[rw])  in blk_throtl_bio()
2209 		if (tg->last_low_overflow_time[rw] == 0)  in blk_throtl_bio()
2210 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2214 		if (sq->nr_queued[rw])  in blk_throtl_bio()
2219 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2241 		throtl_trim_slice(tg, rw);  in blk_throtl_bio()
2248 		qn = &tg->qnode_on_parent[rw];  in blk_throtl_bio()
2257 		   rw == READ ? 'R' : 'W',  in blk_throtl_bio()
2258 		   tg->bytes_disp[rw], bio->bi_iter.bi_size,  in blk_throtl_bio()
2259 		   tg_bps_limit(tg, rw),  in blk_throtl_bio()
2260 		   tg->io_disp[rw], tg_iops_limit(tg, rw),  in blk_throtl_bio()
2263 	tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2265 	td->nr_queued[rw]++;  in blk_throtl_bio()
2330 	int rw = bio_data_dir(bio);  in blk_throtl_bio_endio()  local
2358 		threshold = tg->td->avg_buckets[rw][bucket].latency +  in blk_throtl_bio_endio()