projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 9f36eaed MJ |
1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
| 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> | |
| 241ae9a8 MD |
14 | #include <lttng-events.h> |
| 15 | #include <wrapper/ringbuffer/frontend_types.h> | |
| 16 | #include <wrapper/vmalloc.h> | |
| 17 | #include <lttng-tracer.h> | |
| 79150a49 JD |
18 | |
| 19 | /* | |
| 20 | * Interruptible at value -1 means "unknown". | |
| 21 | */ | |
| 22 | ||
| 23 | static | |
| 24 | size_t interruptible_get_size(size_t offset) | |
| 25 | { | |
| 26 | size_t size = 0; | |
| 27 | ||
| 28 | size += lib_ring_buffer_align(offset, lttng_alignof(int8_t)); | |
| 29 | size += sizeof(int8_t); | |
| 30 | return size; | |
| 31 | } | |
| 32 | ||
| 33 | static | |
| 34 | void interruptible_record(struct lttng_ctx_field *field, | |
| 35 | struct lib_ring_buffer_ctx *ctx, | |
| 36 | struct lttng_channel *chan) | |
| 37 | { | |
| 38 | struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv; | |
| 39 | int8_t interruptible = lttng_probe_ctx->interruptible; | |
| 40 | ||
| 41 | lib_ring_buffer_align_ctx(ctx, lttng_alignof(interruptible)); | |
| 42 | chan->ops->event_write(ctx, &interruptible, sizeof(interruptible)); | |
| 43 | } | |
| 44 | ||
| 45 | static | |
| 46 | void interruptible_get_value(struct lttng_ctx_field *field, | |
| 47 | struct lttng_probe_ctx *lttng_probe_ctx, | |
| 48 | union lttng_ctx_value *value) | |
| 49 | { | |
| 50 | int8_t interruptible = lttng_probe_ctx->interruptible; | |
| 51 | ||
| 52 | value->s64 = interruptible; | |
| 53 | } | |
| 54 | ||
| 55 | int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx) | |
| 56 | { | |
| 57 | struct lttng_ctx_field *field; | |
| 58 | ||
| 59 | field = lttng_append_context(ctx); | |
| 60 | if (!field) | |
| 61 | return -ENOMEM; | |
| 62 | if (lttng_find_context(*ctx, "interruptible")) { | |
| 63 | lttng_remove_context_field(ctx, field); | |
| 64 | return -EEXIST; | |
| 65 | } | |
| 66 | field->event_field.name = "interruptible"; | |
| 67 | field->event_field.type.atype = atype_integer; | |
| 68 | field->event_field.type.u.basic.integer.size = sizeof(int8_t) * CHAR_BIT; | |
| 69 | field->event_field.type.u.basic.integer.alignment = lttng_alignof(int8_t) * CHAR_BIT; | |
| 70 | field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(int8_t); | |
| 71 | field->event_field.type.u.basic.integer.reverse_byte_order = 0; | |
| 72 | field->event_field.type.u.basic.integer.base = 10; | |
| 73 | field->event_field.type.u.basic.integer.encoding = lttng_encode_none; | |
| 74 | field->get_size = interruptible_get_size; | |
| 75 | field->record = interruptible_record; | |
| 76 | field->get_value = interruptible_get_value; | |
| 77 | lttng_context_update(*ctx); | |
| ea53823c | 78 | wrapper_vmalloc_sync_mappings(); |
| 79150a49 JD |
79 | return 0; |
| 80 | } | |
| 81 | EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx); |