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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
9f36eaed | 2 | * |
79150a49 JD |
3 | * lttng-context-interruptible.c |
4 | * | |
5 | * LTTng interruptible context. | |
6 | * | |
7 | * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
79150a49 JD |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/irqflags.h> | |
2df37e95 | 14 | #include <lttng/events.h> |
437d5aa5 | 15 | #include <lttng/events-internal.h> |
24591303 | 16 | #include <ringbuffer/frontend_types.h> |
241ae9a8 | 17 | #include <wrapper/vmalloc.h> |
2df37e95 | 18 | #include <lttng/tracer.h> |
79150a49 JD |
19 | |
20 | /* | |
21 | * Interruptible at value -1 means "unknown". | |
22 | */ | |
23 | ||
24 | static | |
346cb5ee | 25 | size_t interruptible_get_size(void *priv, struct lttng_kernel_probe_ctx *probe_ctx, size_t offset) |
79150a49 JD |
26 | { |
27 | size_t size = 0; | |
28 | ||
29 | size += lib_ring_buffer_align(offset, lttng_alignof(int8_t)); | |
30 | size += sizeof(int8_t); | |
31 | return size; | |
32 | } | |
33 | ||
34 | static | |
346cb5ee | 35 | void interruptible_record(void *priv, struct lttng_kernel_probe_ctx *probe_ctx, |
e27e4381 | 36 | struct lttng_kernel_ring_buffer_ctx *ctx, |
ac847066 | 37 | struct lttng_kernel_channel_buffer *chan) |
79150a49 | 38 | { |
346cb5ee | 39 | struct lttng_kernel_probe_ctx *lttng_probe_ctx = ctx->probe_ctx; |
79150a49 JD |
40 | int8_t interruptible = lttng_probe_ctx->interruptible; |
41 | ||
77fcffef | 42 | chan->ops->event_write(ctx, &interruptible, sizeof(interruptible), lttng_alignof(interruptible)); |
79150a49 JD |
43 | } |
44 | ||
45 | static | |
ea2d95e4 | 46 | void interruptible_get_value(void *priv, |
346cb5ee | 47 | struct lttng_kernel_probe_ctx *lttng_probe_ctx, |
ea2d95e4 | 48 | struct lttng_ctx_value *value) |
79150a49 JD |
49 | { |
50 | int8_t interruptible = lttng_probe_ctx->interruptible; | |
51 | ||
ea2d95e4 | 52 | value->u.s64 = interruptible; |
79150a49 JD |
53 | } |
54 | ||
437d5aa5 MD |
55 | static const struct lttng_kernel_ctx_field *ctx_field = lttng_kernel_static_ctx_field( |
56 | lttng_kernel_static_event_field("interruptible", | |
57 | lttng_kernel_static_type_integer_from_type(int8_t, __BYTE_ORDER, 10), | |
58 | false, false, false), | |
59 | interruptible_get_size, | |
437d5aa5 MD |
60 | interruptible_record, |
61 | interruptible_get_value, | |
62 | NULL, NULL); | |
63 | ||
64 | int lttng_add_interruptible_to_ctx(struct lttng_kernel_ctx **ctx) | |
79150a49 | 65 | { |
437d5aa5 | 66 | int ret; |
79150a49 | 67 | |
437d5aa5 | 68 | if (lttng_kernel_find_context(*ctx, ctx_field->event_field->name)) |
79150a49 | 69 | return -EEXIST; |
437d5aa5 | 70 | ret = lttng_kernel_context_append(ctx, ctx_field); |
263b6c88 | 71 | wrapper_vmalloc_sync_mappings(); |
437d5aa5 | 72 | return ret; |
79150a49 JD |
73 | } |
74 | EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx); |