1 /* SPDX-License-Identifier: GPL-2.0 1 /* SPDX-License-Identifier: GPL-2.0
2 * 2 *
3 * Legacy blkg rwstat helpers enabled by CONFI 3 * Legacy blkg rwstat helpers enabled by CONFIG_BLK_CGROUP_RWSTAT.
4 * Do not use in new code. 4 * Do not use in new code.
5 */ 5 */
6 #include "blk-cgroup-rwstat.h" 6 #include "blk-cgroup-rwstat.h"
7 7
8 int blkg_rwstat_init(struct blkg_rwstat *rwsta 8 int blkg_rwstat_init(struct blkg_rwstat *rwstat, gfp_t gfp)
9 { 9 {
10 int i, ret; 10 int i, ret;
11 11
12 ret = percpu_counter_init_many(rwstat- !! 12 for (i = 0; i < BLKG_RWSTAT_NR; i++) {
13 if (ret) !! 13 ret = percpu_counter_init(&rwstat->cpu_cnt[i], 0, gfp);
14 return ret; !! 14 if (ret) {
15 !! 15 while (--i >= 0)
16 for (i = 0; i < BLKG_RWSTAT_NR; i++) !! 16 percpu_counter_destroy(&rwstat->cpu_cnt[i]);
>> 17 return ret;
>> 18 }
17 atomic64_set(&rwstat->aux_cnt[ 19 atomic64_set(&rwstat->aux_cnt[i], 0);
>> 20 }
18 return 0; 21 return 0;
19 } 22 }
20 EXPORT_SYMBOL_GPL(blkg_rwstat_init); 23 EXPORT_SYMBOL_GPL(blkg_rwstat_init);
21 24
22 void blkg_rwstat_exit(struct blkg_rwstat *rwst 25 void blkg_rwstat_exit(struct blkg_rwstat *rwstat)
23 { 26 {
24 percpu_counter_destroy_many(rwstat->cp !! 27 int i;
>> 28
>> 29 for (i = 0; i < BLKG_RWSTAT_NR; i++)
>> 30 percpu_counter_destroy(&rwstat->cpu_cnt[i]);
25 } 31 }
26 EXPORT_SYMBOL_GPL(blkg_rwstat_exit); 32 EXPORT_SYMBOL_GPL(blkg_rwstat_exit);
27 33
28 /** 34 /**
29 * __blkg_prfill_rwstat - prfill helper for a 35 * __blkg_prfill_rwstat - prfill helper for a blkg_rwstat
30 * @sf: seq_file to print to 36 * @sf: seq_file to print to
31 * @pd: policy private data of interest 37 * @pd: policy private data of interest
32 * @rwstat: rwstat to print 38 * @rwstat: rwstat to print
33 * 39 *
34 * Print @rwstat to @sf for the device assocai 40 * Print @rwstat to @sf for the device assocaited with @pd.
35 */ 41 */
36 u64 __blkg_prfill_rwstat(struct seq_file *sf, 42 u64 __blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
37 const struct blkg_rws 43 const struct blkg_rwstat_sample *rwstat)
38 { 44 {
39 static const char *rwstr[] = { 45 static const char *rwstr[] = {
40 [BLKG_RWSTAT_READ] = "Rea 46 [BLKG_RWSTAT_READ] = "Read",
41 [BLKG_RWSTAT_WRITE] = "Wri 47 [BLKG_RWSTAT_WRITE] = "Write",
42 [BLKG_RWSTAT_SYNC] = "Syn 48 [BLKG_RWSTAT_SYNC] = "Sync",
43 [BLKG_RWSTAT_ASYNC] = "Asy 49 [BLKG_RWSTAT_ASYNC] = "Async",
44 [BLKG_RWSTAT_DISCARD] = "Dis 50 [BLKG_RWSTAT_DISCARD] = "Discard",
45 }; 51 };
46 const char *dname = blkg_dev_name(pd-> 52 const char *dname = blkg_dev_name(pd->blkg);
47 u64 v; 53 u64 v;
48 int i; 54 int i;
49 55
50 if (!dname) 56 if (!dname)
51 return 0; 57 return 0;
52 58
53 for (i = 0; i < BLKG_RWSTAT_NR; i++) 59 for (i = 0; i < BLKG_RWSTAT_NR; i++)
54 seq_printf(sf, "%s %s %llu\n", 60 seq_printf(sf, "%s %s %llu\n", dname, rwstr[i],
55 rwstat->cnt[i]); 61 rwstat->cnt[i]);
56 62
57 v = rwstat->cnt[BLKG_RWSTAT_READ] + 63 v = rwstat->cnt[BLKG_RWSTAT_READ] +
58 rwstat->cnt[BLKG_RWSTAT_WRITE] 64 rwstat->cnt[BLKG_RWSTAT_WRITE] +
59 rwstat->cnt[BLKG_RWSTAT_DISCAR 65 rwstat->cnt[BLKG_RWSTAT_DISCARD];
60 seq_printf(sf, "%s Total %llu\n", dnam 66 seq_printf(sf, "%s Total %llu\n", dname, v);
61 return v; 67 return v;
62 } 68 }
63 EXPORT_SYMBOL_GPL(__blkg_prfill_rwstat); 69 EXPORT_SYMBOL_GPL(__blkg_prfill_rwstat);
64 70
65 /** 71 /**
66 * blkg_prfill_rwstat - prfill callback for bl 72 * blkg_prfill_rwstat - prfill callback for blkg_rwstat
67 * @sf: seq_file to print to 73 * @sf: seq_file to print to
68 * @pd: policy private data of interest 74 * @pd: policy private data of interest
69 * @off: offset to the blkg_rwstat in @pd 75 * @off: offset to the blkg_rwstat in @pd
70 * 76 *
71 * prfill callback for printing a blkg_rwstat. 77 * prfill callback for printing a blkg_rwstat.
72 */ 78 */
73 u64 blkg_prfill_rwstat(struct seq_file *sf, st 79 u64 blkg_prfill_rwstat(struct seq_file *sf, struct blkg_policy_data *pd,
74 int off) 80 int off)
75 { 81 {
76 struct blkg_rwstat_sample rwstat = { } 82 struct blkg_rwstat_sample rwstat = { };
77 83
78 blkg_rwstat_read((void *)pd + off, &rw 84 blkg_rwstat_read((void *)pd + off, &rwstat);
79 return __blkg_prfill_rwstat(sf, pd, &r 85 return __blkg_prfill_rwstat(sf, pd, &rwstat);
80 } 86 }
81 EXPORT_SYMBOL_GPL(blkg_prfill_rwstat); 87 EXPORT_SYMBOL_GPL(blkg_prfill_rwstat);
82 88
83 /** 89 /**
84 * blkg_rwstat_recursive_sum - collect hierarc 90 * blkg_rwstat_recursive_sum - collect hierarchical blkg_rwstat
85 * @blkg: blkg of interest 91 * @blkg: blkg of interest
86 * @pol: blkcg_policy which contains the blkg_ 92 * @pol: blkcg_policy which contains the blkg_rwstat
87 * @off: offset to the blkg_rwstat in blkg_pol 93 * @off: offset to the blkg_rwstat in blkg_policy_data or @blkg
88 * @sum: blkg_rwstat_sample structure containi 94 * @sum: blkg_rwstat_sample structure containing the results
89 * 95 *
90 * Collect the blkg_rwstat specified by @blkg, 96 * Collect the blkg_rwstat specified by @blkg, @pol and @off and all its
91 * online descendants and their aux counts. T 97 * online descendants and their aux counts. The caller must be holding the
92 * queue lock for online tests. 98 * queue lock for online tests.
93 * 99 *
94 * If @pol is NULL, blkg_rwstat is at @off byt 100 * If @pol is NULL, blkg_rwstat is at @off bytes into @blkg; otherwise, it
95 * is at @off bytes into @blkg's blkg_policy_d 101 * is at @off bytes into @blkg's blkg_policy_data of the policy.
96 */ 102 */
97 void blkg_rwstat_recursive_sum(struct blkcg_gq 103 void blkg_rwstat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol,
98 int off, struct blkg_rwstat_sa 104 int off, struct blkg_rwstat_sample *sum)
99 { 105 {
100 struct blkcg_gq *pos_blkg; 106 struct blkcg_gq *pos_blkg;
101 struct cgroup_subsys_state *pos_css; 107 struct cgroup_subsys_state *pos_css;
102 unsigned int i; 108 unsigned int i;
103 109
104 lockdep_assert_held(&blkg->q->queue_lo 110 lockdep_assert_held(&blkg->q->queue_lock);
105 111
106 memset(sum, 0, sizeof(*sum)); <<
107 rcu_read_lock(); 112 rcu_read_lock();
108 blkg_for_each_descendant_pre(pos_blkg, 113 blkg_for_each_descendant_pre(pos_blkg, pos_css, blkg) {
109 struct blkg_rwstat *rwstat; 114 struct blkg_rwstat *rwstat;
110 115
111 if (!pos_blkg->online) 116 if (!pos_blkg->online)
112 continue; 117 continue;
113 118
114 if (pol) 119 if (pol)
115 rwstat = (void *)blkg_ 120 rwstat = (void *)blkg_to_pd(pos_blkg, pol) + off;
116 else 121 else
117 rwstat = (void *)pos_b 122 rwstat = (void *)pos_blkg + off;
118 123
119 for (i = 0; i < BLKG_RWSTAT_NR 124 for (i = 0; i < BLKG_RWSTAT_NR; i++)
120 sum->cnt[i] += blkg_rw !! 125 sum->cnt[i] = blkg_rwstat_read_counter(rwstat, i);
121 } 126 }
122 rcu_read_unlock(); 127 rcu_read_unlock();
123 } 128 }
124 EXPORT_SYMBOL_GPL(blkg_rwstat_recursive_sum); 129 EXPORT_SYMBOL_GPL(blkg_rwstat_recursive_sum);
125 130
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