292 static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)  in tg_bps_limit()  argument
302 	ret = tg->bps[rw][td->limit_index];  in tg_bps_limit()
306 		    tg->iops[rw][td->limit_index])  in tg_bps_limit()
312 	if (td->limit_index == LIMIT_MAX && tg->bps[rw][LIMIT_LOW] &&  in tg_bps_limit()
313 	    tg->bps[rw][LIMIT_LOW] != tg->bps[rw][LIMIT_MAX]) {  in tg_bps_limit()
316 		adjusted = throtl_adjusted_limit(tg->bps[rw][LIMIT_LOW], td);  in tg_bps_limit()
317 		ret = min(tg->bps[rw][LIMIT_MAX], adjusted);  in tg_bps_limit()
322 static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)  in tg_iops_limit()  argument
332 	ret = tg->iops[rw][td->limit_index];  in tg_iops_limit()
336 		    tg->bps[rw][td->limit_index])  in tg_iops_limit()
342 	if (td->limit_index == LIMIT_MAX && tg->iops[rw][LIMIT_LOW] &&  in tg_iops_limit()
343 	    tg->iops[rw][LIMIT_LOW] != tg->iops[rw][LIMIT_MAX]) {  in tg_iops_limit()
346 		adjusted = throtl_adjusted_limit(tg->iops[rw][LIMIT_LOW], td);  in tg_iops_limit()
349 		ret = min_t(unsigned int, tg->iops[rw][LIMIT_MAX], adjusted);  in tg_iops_limit()
486 	int rw;  in throtl_pd_alloc()  local
494 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_pd_alloc()
495 		throtl_qnode_init(&tg->qnode_on_self[rw], tg);  in throtl_pd_alloc()
496 		throtl_qnode_init(&tg->qnode_on_parent[rw], tg);  in throtl_pd_alloc()
553 	int rw;  in tg_update_has_rules()  local
555 	for (rw = READ; rw <= WRITE; rw++)  in tg_update_has_rules()
556 		tg->has_rules[rw] = (parent_tg && parent_tg->has_rules[rw]) ||  in tg_update_has_rules()
558 			 (tg_bps_limit(tg, rw) != U64_MAX ||  in tg_update_has_rules()
559 			  tg_iops_limit(tg, rw) != UINT_MAX));  in tg_update_has_rules()
760 		bool rw, unsigned long start)  in throtl_start_new_slice_with_credit()  argument
762 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
763 	tg->io_disp[rw] = 0;  in throtl_start_new_slice_with_credit()
771 	if (time_after_eq(start, tg->slice_start[rw]))  in throtl_start_new_slice_with_credit()
772 		tg->slice_start[rw] = start;  in throtl_start_new_slice_with_credit()
774 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice_with_credit()
777 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice_with_credit()
778 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice_with_credit()
781 static inline void throtl_start_new_slice(struct throtl_grp *tg, bool rw)  in throtl_start_new_slice()  argument
783 	tg->bytes_disp[rw] = 0;  in throtl_start_new_slice()
784 	tg->io_disp[rw] = 0;  in throtl_start_new_slice()
785 	tg->slice_start[rw] = jiffies;  in throtl_start_new_slice()
786 	tg->slice_end[rw] = jiffies + tg->td->throtl_slice;  in throtl_start_new_slice()
789 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_start_new_slice()
790 		   tg->slice_end[rw], jiffies);  in throtl_start_new_slice()
793 static inline void throtl_set_slice_end(struct throtl_grp *tg, bool rw,  in throtl_set_slice_end()  argument
796 	tg->slice_end[rw] = roundup(jiffy_end, tg->td->throtl_slice);  in throtl_set_slice_end()
799 static inline void throtl_extend_slice(struct throtl_grp *tg, bool rw,  in throtl_extend_slice()  argument
802 	tg->slice_end[rw] = roundup(jiffy_end, tg->td->throtl_slice);  in throtl_extend_slice()
805 		   rw == READ ? 'R' : 'W', tg->slice_start[rw],  in throtl_extend_slice()
806 		   tg->slice_end[rw], jiffies);  in throtl_extend_slice()
810 static bool throtl_slice_used(struct throtl_grp *tg, bool rw)  in throtl_slice_used()  argument
812 	if (time_in_range(jiffies, tg->slice_start[rw], tg->slice_end[rw]))  in throtl_slice_used()
819 static inline void throtl_trim_slice(struct throtl_grp *tg, bool rw)  in throtl_trim_slice()  argument
824 	BUG_ON(time_before(tg->slice_end[rw], tg->slice_start[rw]));  in throtl_trim_slice()
831 	if (throtl_slice_used(tg, rw))  in throtl_trim_slice()
842 	throtl_set_slice_end(tg, rw, jiffies + tg->td->throtl_slice);  in throtl_trim_slice()
844 	time_elapsed = jiffies - tg->slice_start[rw];  in throtl_trim_slice()
850 	tmp = tg_bps_limit(tg, rw) * tg->td->throtl_slice * nr_slices;  in throtl_trim_slice()
854 	io_trim = (tg_iops_limit(tg, rw) * tg->td->throtl_slice * nr_slices) /  in throtl_trim_slice()
860 	if (tg->bytes_disp[rw] >= bytes_trim)  in throtl_trim_slice()
861 		tg->bytes_disp[rw] -= bytes_trim;  in throtl_trim_slice()
863 		tg->bytes_disp[rw] = 0;  in throtl_trim_slice()
865 	if (tg->io_disp[rw] >= io_trim)  in throtl_trim_slice()
866 		tg->io_disp[rw] -= io_trim;  in throtl_trim_slice()
868 		tg->io_disp[rw] = 0;  in throtl_trim_slice()
870 	tg->slice_start[rw] += nr_slices * tg->td->throtl_slice;  in throtl_trim_slice()
874 		   rw == READ ? 'R' : 'W', nr_slices, bytes_trim, io_trim,  in throtl_trim_slice()
875 		   tg->slice_start[rw], tg->slice_end[rw], jiffies);  in throtl_trim_slice()
881 	bool rw = bio_data_dir(bio);  in tg_with_in_iops_limit()  local
886 	jiffy_elapsed = jiffies - tg->slice_start[rw];  in tg_with_in_iops_limit()
898 	tmp = (u64)tg_iops_limit(tg, rw) * jiffy_elapsed_rnd;  in tg_with_in_iops_limit()
906 	if (tg->io_disp[rw] + 1 <= io_allowed) {  in tg_with_in_iops_limit()
923 	bool rw = bio_data_dir(bio);  in tg_with_in_bps_limit()  local
928 	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];  in tg_with_in_bps_limit()
936 	tmp = tg_bps_limit(tg, rw) * jiffy_elapsed_rnd;  in tg_with_in_bps_limit()
940 	if (tg->bytes_disp[rw] + bio_size <= bytes_allowed) {  in tg_with_in_bps_limit()
947 	extra_bytes = tg->bytes_disp[rw] + bio_size - bytes_allowed;  in tg_with_in_bps_limit()
948 	jiffy_wait = div64_u64(extra_bytes * HZ, tg_bps_limit(tg, rw));  in tg_with_in_bps_limit()
970 	bool rw = bio_data_dir(bio);  in tg_may_dispatch()  local
979 	BUG_ON(tg->service_queue.nr_queued[rw] &&  in tg_may_dispatch()
980 	       bio != throtl_peek_queued(&tg->service_queue.queued[rw]));  in tg_may_dispatch()
983 	if (tg_bps_limit(tg, rw) == U64_MAX &&  in tg_may_dispatch()
984 	    tg_iops_limit(tg, rw) == UINT_MAX) {  in tg_may_dispatch()
997 	if (throtl_slice_used(tg, rw) && !(tg->service_queue.nr_queued[rw]))  in tg_may_dispatch()
998 		throtl_start_new_slice(tg, rw);  in tg_may_dispatch()
1000 		if (time_before(tg->slice_end[rw],  in tg_may_dispatch()
1002 			throtl_extend_slice(tg, rw,  in tg_may_dispatch()
1018 	if (time_before(tg->slice_end[rw], jiffies + max_wait))  in tg_may_dispatch()
1019 		throtl_extend_slice(tg, rw, jiffies + max_wait);  in tg_may_dispatch()
1026 	bool rw = bio_data_dir(bio);  in throtl_charge_bio()  local
1030 	tg->bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1031 	tg->io_disp[rw]++;  in throtl_charge_bio()
1032 	tg->last_bytes_disp[rw] += bio_size;  in throtl_charge_bio()
1033 	tg->last_io_disp[rw]++;  in throtl_charge_bio()
1058 	bool rw = bio_data_dir(bio);  in throtl_add_bio_tg()  local
1061 		qn = &tg->qnode_on_self[rw];  in throtl_add_bio_tg()
1069 	if (!sq->nr_queued[rw])  in throtl_add_bio_tg()
1072 	throtl_qnode_add_bio(bio, qn, &sq->queued[rw]);  in throtl_add_bio_tg()
1074 	sq->nr_queued[rw]++;  in throtl_add_bio_tg()
1105 					struct throtl_grp *parent_tg, bool rw)  in start_parent_slice_with_credit()  argument
1107 	if (throtl_slice_used(parent_tg, rw)) {  in start_parent_slice_with_credit()
1108 		throtl_start_new_slice_with_credit(parent_tg, rw,  in start_parent_slice_with_credit()
1109 				child_tg->slice_start[rw]);  in start_parent_slice_with_credit()
1114 static void tg_dispatch_one_bio(struct throtl_grp *tg, bool rw)  in tg_dispatch_one_bio()  argument
1128 	bio = throtl_pop_queued(&sq->queued[rw], &tg_to_put);  in tg_dispatch_one_bio()
1129 	sq->nr_queued[rw]--;  in tg_dispatch_one_bio()
1141 		throtl_add_bio_tg(bio, &tg->qnode_on_parent[rw], parent_tg);  in tg_dispatch_one_bio()
1142 		start_parent_slice_with_credit(tg, parent_tg, rw);  in tg_dispatch_one_bio()
1144 		throtl_qnode_add_bio(bio, &tg->qnode_on_parent[rw],  in tg_dispatch_one_bio()
1145 				     &parent_sq->queued[rw]);  in tg_dispatch_one_bio()
1146 		BUG_ON(tg->td->nr_queued[rw] <= 0);  in tg_dispatch_one_bio()
1147 		tg->td->nr_queued[rw]--;  in tg_dispatch_one_bio()
1150 	throtl_trim_slice(tg, rw);  in tg_dispatch_one_bio()
1312 	int rw;  in blk_throtl_dispatch_work_fn()  local
1317 	for (rw = READ; rw <= WRITE; rw++)  in blk_throtl_dispatch_work_fn()
1318 		while ((bio = throtl_pop_queued(&td_sq->queued[rw], NULL)))  in blk_throtl_dispatch_work_fn()
2038 	int i, cpu, rw;  in throtl_update_latency_buckets()  local
2049 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2051 			struct latency_bucket *tmp = &td->tmp_buckets[rw][i];  in throtl_update_latency_buckets()
2057 				bucket = per_cpu_ptr(td->latency_buckets[rw],  in throtl_update_latency_buckets()
2068 				latency[rw] = tmp->total_latency;  in throtl_update_latency_buckets()
2072 				latency[rw] /= samples;  in throtl_update_latency_buckets()
2073 				if (latency[rw] == 0)  in throtl_update_latency_buckets()
2075 				avg_latency[rw][i].latency = latency[rw];  in throtl_update_latency_buckets()
2080 	for (rw = READ; rw <= WRITE; rw++) {  in throtl_update_latency_buckets()
2082 			if (!avg_latency[rw][i].latency) {  in throtl_update_latency_buckets()
2083 				if (td->avg_buckets[rw][i].latency < last_latency[rw])  in throtl_update_latency_buckets()
2084 					td->avg_buckets[rw][i].latency =  in throtl_update_latency_buckets()
2085 						last_latency[rw];  in throtl_update_latency_buckets()
2089 			if (!td->avg_buckets[rw][i].valid)  in throtl_update_latency_buckets()
2090 				latency[rw] = avg_latency[rw][i].latency;  in throtl_update_latency_buckets()
2092 				latency[rw] = (td->avg_buckets[rw][i].latency * 7 +  in throtl_update_latency_buckets()
2093 					avg_latency[rw][i].latency) >> 3;  in throtl_update_latency_buckets()
2095 			td->avg_buckets[rw][i].latency = max(latency[rw],  in throtl_update_latency_buckets()
2096 				last_latency[rw]);  in throtl_update_latency_buckets()
2097 			td->avg_buckets[rw][i].valid = true;  in throtl_update_latency_buckets()
2098 			last_latency[rw] = td->avg_buckets[rw][i].latency;  in throtl_update_latency_buckets()
2123 	bool rw = bio_data_dir(bio);  in blk_throtl_bio()  local
2130 	if (bio_flagged(bio, BIO_THROTTLED) || !tg->has_rules[rw])  in blk_throtl_bio()
2143 		if (tg->last_low_overflow_time[rw] == 0)  in blk_throtl_bio()
2144 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2148 		if (sq->nr_queued[rw])  in blk_throtl_bio()
2153 			tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2175 		throtl_trim_slice(tg, rw);  in blk_throtl_bio()
2182 		qn = &tg->qnode_on_parent[rw];  in blk_throtl_bio()
2191 		   rw == READ ? 'R' : 'W',  in blk_throtl_bio()
2192 		   tg->bytes_disp[rw], bio->bi_iter.bi_size,  in blk_throtl_bio()
2193 		   tg_bps_limit(tg, rw),  in blk_throtl_bio()
2194 		   tg->io_disp[rw], tg_iops_limit(tg, rw),  in blk_throtl_bio()
2197 	tg->last_low_overflow_time[rw] = jiffies;  in blk_throtl_bio()
2199 	td->nr_queued[rw]++;  in blk_throtl_bio()
2263 	int rw = bio_data_dir(bio);  in blk_throtl_bio_endio()  local
2289 		threshold = tg->td->avg_buckets[rw][bucket].latency +  in blk_throtl_bio_endio()
2343 	int rw;  in blk_throtl_drain()  local
2363 	for (rw = READ; rw <= WRITE; rw++)  in blk_throtl_drain()
2364 		while ((bio = throtl_pop_queued(&td->service_queue.queued[rw],  in blk_throtl_drain()