1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
3 * lttng-context-interruptible.c
5 * LTTng interruptible context.
7 * Copyright (C) 2009-2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <linux/irqflags.h>
14 #include <lttng/events.h>
15 #include <lttng/events-internal.h>
16 #include <ringbuffer/frontend_types.h>
17 #include <wrapper/vmalloc.h>
18 #include <lttng/tracer.h>
21 * Interruptible at value -1 means "unknown".
25 size_t interruptible_get_size(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
, size_t offset
)
29 size
+= lib_ring_buffer_align(offset
, lttng_alignof(int8_t));
30 size
+= sizeof(int8_t);
35 void interruptible_record(void *priv
, struct lttng_kernel_probe_ctx
*probe_ctx
,
36 struct lttng_kernel_ring_buffer_ctx
*ctx
,
37 struct lttng_kernel_channel_buffer
*chan
)
39 struct lttng_kernel_probe_ctx
*lttng_probe_ctx
= ctx
->probe_ctx
;
40 int8_t interruptible
= lttng_probe_ctx
->interruptible
;
42 chan
->ops
->event_write(ctx
, &interruptible
, sizeof(interruptible
), lttng_alignof(interruptible
));
46 void interruptible_get_value(void *priv
,
47 struct lttng_kernel_probe_ctx
*lttng_probe_ctx
,
48 struct lttng_ctx_value
*value
)
50 int8_t interruptible
= lttng_probe_ctx
->interruptible
;
52 value
->u
.s64
= interruptible
;
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),
59 interruptible_get_size
,
61 interruptible_get_value
,
64 int lttng_add_interruptible_to_ctx(struct lttng_kernel_ctx
**ctx
)
68 if (lttng_kernel_find_context(*ctx
, ctx_field
->event_field
->name
))
70 ret
= lttng_kernel_context_append(ctx
, ctx_field
);
71 wrapper_vmalloc_sync_mappings();
74 EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx
);