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a101fa10 MD |
1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
2 | * | |
3 | * lttng-counter-client-percpu-64-modular.c | |
4 | * | |
5 | * LTTng lib counter client. Per-cpu 64-bit counters in overflow | |
6 | * arithmetic. | |
7 | * | |
8 | * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <lttng/tracer.h> | |
17f90b04 MD |
13 | #include <lttng/events.h> |
14 | #include <lttng/events-internal.h> | |
a101fa10 MD |
15 | #include <counter/counter.h> |
16 | #include <counter/counter-api.h> | |
17 | ||
18 | static const struct lib_counter_config client_config = { | |
19 | .alloc = COUNTER_ALLOC_PER_CPU, | |
20 | .sync = COUNTER_SYNC_PER_CPU, | |
21 | .arithmetic = COUNTER_ARITHMETIC_MODULAR, | |
22 | .counter_size = COUNTER_SIZE_64_BIT, | |
23 | }; | |
24 | ||
25 | static struct lib_counter *counter_create(size_t nr_dimensions, | |
26 | const size_t *max_nr_elem, | |
27 | int64_t global_sum_step) | |
28 | { | |
29 | return lttng_counter_create(&client_config, nr_dimensions, max_nr_elem, | |
30 | global_sum_step); | |
31 | } | |
32 | ||
33 | static void counter_destroy(struct lib_counter *counter) | |
34 | { | |
35 | return lttng_counter_destroy(counter); | |
36 | } | |
37 | ||
38 | static int counter_add(struct lib_counter *counter, const size_t *dimension_indexes, int64_t v) | |
39 | { | |
40 | return lttng_counter_add(&client_config, counter, dimension_indexes, v); | |
41 | } | |
42 | ||
43 | static int counter_read(struct lib_counter *counter, const size_t *dimension_indexes, int cpu, | |
44 | int64_t *value, bool *overflow, bool *underflow) | |
45 | { | |
46 | return lttng_counter_read(&client_config, counter, dimension_indexes, cpu, value, | |
47 | overflow, underflow); | |
48 | } | |
49 | ||
50 | static int counter_aggregate(struct lib_counter *counter, const size_t *dimension_indexes, | |
51 | int64_t *value, bool *overflow, bool *underflow) | |
52 | { | |
53 | return lttng_counter_aggregate(&client_config, counter, dimension_indexes, value, | |
54 | overflow, underflow); | |
55 | } | |
56 | ||
57 | static int counter_clear(struct lib_counter *counter, const size_t *dimension_indexes) | |
58 | { | |
59 | return lttng_counter_clear(&client_config, counter, dimension_indexes); | |
60 | } | |
61 | ||
62 | static struct lttng_counter_transport lttng_counter_transport = { | |
63 | .name = "counter-per-cpu-64-modular", | |
64 | .owner = THIS_MODULE, | |
65 | .ops = { | |
66 | .counter_create = counter_create, | |
67 | .counter_destroy = counter_destroy, | |
68 | .counter_add = counter_add, | |
69 | .counter_read = counter_read, | |
70 | .counter_aggregate = counter_aggregate, | |
71 | .counter_clear = counter_clear, | |
72 | }, | |
73 | }; | |
74 | ||
75 | static int __init lttng_counter_client_init(void) | |
76 | { | |
77 | /* | |
78 | * This vmalloc sync all also takes care of the lib counter | |
79 | * vmalloc'd module pages when it is built as a module into LTTng. | |
80 | */ | |
81 | wrapper_vmalloc_sync_mappings(); | |
82 | lttng_counter_transport_register(<tng_counter_transport); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | module_init(lttng_counter_client_init); | |
87 | ||
88 | static void __exit lttng_counter_client_exit(void) | |
89 | { | |
90 | lttng_counter_transport_unregister(<tng_counter_transport); | |
91 | } | |
92 | ||
93 | module_exit(lttng_counter_client_exit); | |
94 | ||
95 | MODULE_LICENSE("GPL and additional rights"); | |
96 | MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>"); | |
97 | MODULE_DESCRIPTION("LTTng counter per-cpu 32-bit overflow client"); | |
98 | MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "." | |
99 | __stringify(LTTNG_MODULES_MINOR_VERSION) "." | |
100 | __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION) | |
101 | LTTNG_MODULES_EXTRAVERSION); |