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()
772 		bool rw, unsigned long start)  in throtl_start_new_slice_with_credit()  argument
774 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
775 	tg->io_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
777 	atomic_set(&tg->io_split_cnt[rw], 0);  in throtl_start_new_slice_with_credit()
785 	if (time_after_eq(start, tg->slice_start[rw]))  in throtl_start_new_slice_with_credit()
786 		tg->slice_start[rw] = start;  in throtl_start_new_slice_with_credit()
788 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice_with_credit()
791 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice_with_credit()
792 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice_with_credit()
795 static inline void throtl_start_new_slice(struct throtl_grp *tg, bool rw)  in throtl_start_new_slice()  argument
797 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice()
798 	tg->io_disp[rw] = 0;  in throtl_start_new_slice()
799 	tg->slice_start[rw] = jiffies;  in throtl_start_new_slice()
800 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice()
802 	atomic_set(&tg->io_split_cnt[rw], 0);  in throtl_start_new_slice()
806 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice()
807 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice()
810 static inline void throtl_set_slice_end(struct throtl_grp *tg, bool rw,  in throtl_set_slice_end()  argument
813 	tg->slice_end[rw] = roundup(jiffy_end, tg->td->throtl_slice);  in throtl_set_slice_end()
816 static inline void throtl_extend_slice(struct throtl_grp *tg, bool rw,  in throtl_extend_slice()  argument
819 	throtl_set_slice_end(tg, rw, jiffy_end);  in throtl_extend_slice()
822 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_extend_slice()
823 		   tg->slice_end[rw], jiffies);  in throtl_extend_slice()
827 static bool throtl_slice_used(struct throtl_grp *tg, bool rw)  in throtl_slice_used()  argument
829 	if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))  in throtl_slice_used()
836 static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)  in throtl_trim_slice()  argument
841 	BUG_ON(time_before(tg->slice_end[rw], tg->slice_start[rw]));  in throtl_trim_slice()
848 	if (throtl_slice_used(tg, rw))  in throtl_trim_slice()
859 	throtl_set_slice_end(tg, rw, jiffies + tg->td->throtl_slice);  in throtl_trim_slice()
861 	time_elapsed = jiffies - tg->slice_start[rw];  in throtl_trim_slice()
867 	tmp = tg_bps_limit(tg, rw) * tg->td->throtl_slice * nr_slices;  in throtl_trim_slice()
871 	io_trim = (tg_iops_limit(tg, rw) * tg->td->throtl_slice * nr_slices) /  in throtl_trim_slice()
877 	if (tg->bytes_disp[rw] >= bytes_trim)  in throtl_trim_slice()
878 		tg->bytes_disp[rw] -= bytes_trim;  in throtl_trim_slice()
880 		tg->bytes_disp[rw] = 0;  in throtl_trim_slice()
882 	if (tg->io_disp[rw] >= io_trim)  in throtl_trim_slice()
883 		tg->io_disp[rw] -= io_trim;  in throtl_trim_slice()
885 		tg->io_disp[rw] = 0;  in throtl_trim_slice()
887 	tg->slice_start[rw] += nr_slices * tg->td->throtl_slice;  in throtl_trim_slice()
891 		   rw == READ ? 'R' : 'W', nr_slices, bytes_trim, io_trim,  in throtl_trim_slice()
892 		   tg->slice_start[rw], tg->slice_end[rw], jiffies);  in throtl_trim_slice()
898 	bool rw = bio_data_dir(bio);  in tg_with_in_iops_limit()  local
909 	jiffy_elapsed = jiffies - tg->slice_start[rw];  in tg_with_in_iops_limit()
929 	if (tg->io_disp[rw] + 1 <= io_allowed) {  in tg_with_in_iops_limit()
946 	bool rw = bio_data_dir(bio);  in tg_with_in_bps_limit()  local
957 	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];  in tg_with_in_bps_limit()
967 	if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) {  in tg_with_in_bps_limit()
974 	extra_bytes = tg->bytes_disp[rw] + bio_size - bytes_allowed;  in tg_with_in_bps_limit()
997 	bool rw = bio_data_dir(bio);  in tg_may_dispatch()  local
999 	u64 bps_limit = tg_bps_limit(tg, rw);  in tg_may_dispatch()
1000 	u32 iops_limit = tg_iops_limit(tg, rw);  in tg_may_dispatch()
1008 	BUG_ON(tg->service_queue.nr_queued[rw] &&  in tg_may_dispatch()
1009 	       bio != throtl_peek_queued(&tg->service_queue.queued[rw]));  in tg_may_dispatch()
1025 	if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))  in tg_may_dispatch()
1026 		throtl_start_new_slice(tg, rw);  in tg_may_dispatch()
1028 		if (time_before(tg->slice_end[rw],  in tg_may_dispatch()
1030 			throtl_extend_slice(tg, rw,  in tg_may_dispatch()
1035 		tg->io_disp[rw] += atomic_xchg(&tg->io_split_cnt[rw], 0);  in tg_may_dispatch()
1049 	if (time_before(tg->slice_end[rw], jiffies + max_wait))  in tg_may_dispatch()
1050 		throtl_extend_slice(tg, rw, jiffies + max_wait);  in tg_may_dispatch()
1057 	bool rw = bio_data_dir(bio);  in throtl_charge_bio()  local
1061 	tg->bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1062 	tg->io_disp[rw]++;  in throtl_charge_bio()
1063 	tg->last_bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1064 	tg->last_io_disp[rw]++;  in throtl_charge_bio()
1089 	bool rw = bio_data_dir(bio);  in throtl_add_bio_tg()  local
1092 		qn = &tg->qnode_on_self[rw];  in throtl_add_bio_tg()
1100 	if (!sq->nr_queued[rw])  in throtl_add_bio_tg()
1103 	throtl_qnode_add_bio(bio, qn, &sq->queued[rw]);  in throtl_add_bio_tg()
1105 	sq->nr_queued[rw]++;  in throtl_add_bio_tg()
1136 					struct throtl_grp *parent_tg, bool rw)  in start_parent_slice_with_credit()  argument
1138 	if (throtl_slice_used(parent_tg, rw)) {  in start_parent_slice_with_credit()
1139 		throtl_start_new_slice_with_credit(parent_tg, rw,  in start_parent_slice_with_credit()
1140 				child_tg->slice_start[rw]);  in start_parent_slice_with_credit()
1145 static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw)  in tg_dispatch_one_bio()  argument
1159 	bio = throtl_pop_queued(&sq->queued[rw], &tg_to_put);  in tg_dispatch_one_bio()
1160 	sq->nr_queued[rw]--;  in tg_dispatch_one_bio()
1172 		throtl_add_bio_tg(bio, &tg->qnode_on_parent[rw], parent_tg);  in tg_dispatch_one_bio()
1173 		start_parent_slice_with_credit(tg, parent_tg, rw);  in tg_dispatch_one_bio()
1175 		throtl_qnode_add_bio(bio, &tg->qnode_on_parent[rw],  in tg_dispatch_one_bio()
1176 				     &parent_sq->queued[rw]);  in tg_dispatch_one_bio()
1177 		BUG_ON(tg->td->nr_queued[rw] <= 0);  in tg_dispatch_one_bio()
1178 		tg->td->nr_queued[rw]--;  in tg_dispatch_one_bio()
1181 	throtl_trim_slice(tg, rw);  in tg_dispatch_one_bio()
1347 	int rw;  in blk_throtl_dispatch_work_fn()  local
1352 	for (rw = READ; rw <= WRITE; rw++)  in blk_throtl_dispatch_work_fn()
1353 		while ((bio = throtl_pop_queued(&td_sq->queued[rw], NULL)))  in blk_throtl_dispatch_work_fn()
2105 	int i, cpu, rw;  in throtl_update_latency_buckets()  local
2116 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2118 			struct latency_bucket *tmp = &td->tmp_buckets[rw][i];  in throtl_update_latency_buckets()
2124 				bucket = per_cpu_ptr(td->latency_buckets[rw],  in throtl_update_latency_buckets()
2135 				latency[rw] = tmp->total_latency;  in throtl_update_latency_buckets()
2139 				latency[rw] /= samples;  in throtl_update_latency_buckets()
2140 				if (latency[rw] == 0)  in throtl_update_latency_buckets()
2142 				avg_latency[rw][i].latency = latency[rw];  in throtl_update_latency_buckets()
2147 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2149 			if (!avg_latency[rw][i].latency) {  in throtl_update_latency_buckets()
2150 				if (td->avg_buckets[rw][i].latency < last_latency[rw])  in throtl_update_latency_buckets()
2151 					td->avg_buckets[rw][i].latency =  in throtl_update_latency_buckets()
2152 						last_latency[rw];  in throtl_update_latency_buckets()
2156 			if (!td->avg_buckets[rw][i].valid)  in throtl_update_latency_buckets()
2157 				latency[rw] = avg_latency[rw][i].latency;  in throtl_update_latency_buckets()
2159 				latency[rw] = (td->avg_buckets[rw][i].latency * 7 +  in throtl_update_latency_buckets()
2160 					avg_latency[rw][i].latency) >> 3;  in throtl_update_latency_buckets()
2162 			td->avg_buckets[rw][i].latency = max(latency[rw],  in throtl_update_latency_buckets()
2163 				last_latency[rw]);  in throtl_update_latency_buckets()
2164 			td->avg_buckets[rw][i].valid = true;  in throtl_update_latency_buckets()
2165 			last_latency[rw] = td->avg_buckets[rw][i].latency;  in throtl_update_latency_buckets()
2189 	bool rw = bio_data_dir(bio);  in blk_throtl_charge_bio_split()  local
2192 		if (!parent->has_rules[rw])  in blk_throtl_charge_bio_split()
2195 		atomic_inc(&parent->io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2196 		atomic_inc(&parent->last_io_split_cnt[rw]);  in blk_throtl_charge_bio_split()
2210 	bool rw = bio_data_dir(bio);  in blk_throtl_bio()  local
2226 	if (!tg->has_rules[rw])  in blk_throtl_bio()
2239 		if (tg->last_low_overflow_time[rw] == 0)  in blk_throtl_bio()
2240 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2244 		if (sq->nr_queued[rw])  in blk_throtl_bio()
2249 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2271 		throtl_trim_slice(tg, rw);  in blk_throtl_bio()
2278 		qn = &tg->qnode_on_parent[rw];  in blk_throtl_bio()
2287 		   rw == READ ? 'R' : 'W',  in blk_throtl_bio()
2288 		   tg->bytes_disp[rw], bio->bi_iter.bi_size,  in blk_throtl_bio()
2289 		   tg_bps_limit(tg, rw),  in blk_throtl_bio()
2290 		   tg->io_disp[rw], tg_iops_limit(tg, rw),  in blk_throtl_bio()
2293 	tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2295 	td->nr_queued[rw]++;  in blk_throtl_bio()
2360 	int rw = bio_data_dir(bio);  in blk_throtl_bio_endio()  local
2388 		threshold = tg->td->avg_buckets[rw][bucket].latency +  in blk_throtl_bio_endio()