X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-events.h;h=bf2e2b9d1df5364cc3213fc70345c38f21d7fd5a;hb=b3c40230ad700b12c39640d8593aece428a2702b;hp=b36e44f997cbb7c6576691ff317677d68fa1f3e5;hpb=85a8074292c4b3779437df0d7c737f3dba00ce58;p=lttng-modules.git diff --git a/probes/lttng-events.h b/probes/lttng-events.h index b36e44f9..bf2e2b9d 100644 --- a/probes/lttng-events.h +++ b/probes/lttng-events.h @@ -1,25 +1,79 @@ -#include -#include +/* + * lttng-events.h + * + * Copyright (C) 2009 Steven Rostedt + * Copyright (C) 2009-2012 Mathieu Desnoyers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include #include -#include -#include "../ltt-events.h" -#include "../ltt-tracer-core.h" - -struct lttng_event_field { - const char *name; - const struct lttng_type type; -}; - -struct lttng_event_desc { - const struct lttng_event_field *fields; - const char *name; - unsigned int nr_fields; -}; +#include "lttng.h" +#include "lttng-types.h" +#include "lttng-probe-user.h" +#include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ +#include "../wrapper/ringbuffer/frontend_types.h" +#include "../lttng-events.h" +#include "../lttng-tracer-core.h" /* * Macro declarations used for all stages. */ +/* + * LTTng name mapping macros. LTTng remaps some of the kernel events to + * enforce name-spacing. + */ +#undef TRACE_EVENT_MAP +#define TRACE_EVENT_MAP(name, map, proto, args, tstruct, assign, print) \ + DECLARE_EVENT_CLASS(map, \ + PARAMS(proto), \ + PARAMS(args), \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) \ + DEFINE_EVENT_MAP(map, name, map, PARAMS(proto), PARAMS(args)) + +#undef TRACE_EVENT_MAP_NOARGS +#define TRACE_EVENT_MAP_NOARGS(name, map, tstruct, assign, print) \ + DECLARE_EVENT_CLASS_NOARGS(map, \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) \ + DEFINE_EVENT_MAP_NOARGS(map, name, map) + +#undef DEFINE_EVENT_PRINT_MAP +#define DEFINE_EVENT_PRINT_MAP(template, name, map, proto, args, print) \ + DEFINE_EVENT_MAP(template, name, map, PARAMS(proto), PARAMS(args)) + +/* Callbacks are meaningless to LTTng. */ +#undef TRACE_EVENT_FN_MAP +#define TRACE_EVENT_FN_MAP(name, map, proto, args, tstruct, \ + assign, print, reg, unreg) \ + TRACE_EVENT_MAP(name, map, PARAMS(proto), PARAMS(args), \ + PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ + +#undef TRACE_EVENT_CONDITION_MAP +#define TRACE_EVENT_CONDITION_MAP(name, map, proto, args, cond, tstruct, assign, print) \ + TRACE_EVENT_MAP(name, map, \ + PARAMS(proto), \ + PARAMS(args), \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) + /* * DECLARE_EVENT_CLASS can be used to add a generic function * handlers for events. That is, if all events have the same @@ -31,29 +85,80 @@ struct lttng_event_desc { */ #undef TRACE_EVENT -#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ - DECLARE_EVENT_CLASS(name, \ - PARAMS(proto), \ - PARAMS(args), \ - PARAMS(tstruct), \ - PARAMS(assign), \ - PARAMS(print)) \ - DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args)) +#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ + TRACE_EVENT_MAP(name, name, \ + PARAMS(proto), \ + PARAMS(args), \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) + +#undef TRACE_EVENT_NOARGS +#define TRACE_EVENT_NOARGS(name, tstruct, assign, print) \ + TRACE_EVENT_MAP_NOARGS(name, name, \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) #undef DEFINE_EVENT_PRINT #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) + DEFINE_EVENT_PRINT_MAP(template, name, name, \ + PARAMS(proto), PARAMS(args), PARAMS(print_)) -/* Callbacks are meaningless to LTTng. */ #undef TRACE_EVENT_FN #define TRACE_EVENT_FN(name, proto, args, tstruct, \ assign, print, reg, unreg) \ - TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \ - PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ + TRACE_EVENT_FN_MAP(name, name, PARAMS(proto), PARAMS(args), \ + PARAMS(tstruct), PARAMS(assign), PARAMS(print), \ + PARAMS(reg), PARAMS(unreg)) \ + +#undef DEFINE_EVENT +#define DEFINE_EVENT(template, name, proto, args) \ + DEFINE_EVENT_MAP(template, name, name, PARAMS(proto), PARAMS(args)) + +#undef DEFINE_EVENT_NOARGS +#define DEFINE_EVENT_NOARGS(template, name) \ + DEFINE_EVENT_MAP_NOARGS(template, name, name) + +#undef TRACE_EVENT_CONDITION +#define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \ + TRACE_EVENT_CONDITION_MAP(name, name, \ + PARAMS(proto), \ + PARAMS(args), \ + PARAMS(cond), \ + PARAMS(tstruct), \ + PARAMS(assign), \ + PARAMS(print)) /* * Stage 1 of the trace events. * + * Create dummy trace calls for each events, verifying that the LTTng module + * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the + * compiler. + */ + +#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ + +#undef TP_PROTO +#define TP_PROTO(args...) args + +#undef TP_ARGS +#define TP_ARGS(args...) args + +#undef DEFINE_EVENT_MAP +#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \ +void trace_##_name(_proto); + +#undef DEFINE_EVENT_MAP_NOARGS +#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \ +void trace_##_name(void *__data); + +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) + +/* + * Stage 2 of the trace events. + * * Create event field type metadata section. * Each event produce an array of fields. */ @@ -62,212 +167,227 @@ struct lttng_event_desc { /* Named field types must be defined in lttng-types.h */ +#undef __field_full +#define __field_full(_type, _item, _order, _base) \ + { \ + .name = #_item, \ + .type = __type_integer(_type, _order, _base, none), \ + }, + #undef __field #define __field(_type, _item) \ - { .name = #_item, .type = { .atype = atype_integer, .name = #_type} }, + __field_full(_type, _item, __BYTE_ORDER, 10) #undef __field_ext -#define __field_ext(_type, _item, _filter_type) __field(_type, _item) +#define __field_ext(_type, _item, _filter_type) \ + __field(_type, _item) -#undef __array -#define __array(_type, _item, _length) \ +#undef __field_hex +#define __field_hex(_type, _item) \ + __field_full(_type, _item, __BYTE_ORDER, 16) + +#undef __field_network +#define __field_network(_type, _item) \ + __field_full(_type, _item, __BIG_ENDIAN, 10) + +#undef __field_network_hex +#define __field_network_hex(_type, _item) \ + __field_full(_type, _item, __BIG_ENDIAN, 16) + +#undef __array_enc_ext +#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ { \ - .name = #_item, \ - .type = { \ + .name = #_item, \ + .type = \ + { \ .atype = atype_array, \ - .name = NULL, \ - .u.array.elem_type = #_type, \ - .u.array.length = _length, \ + .u.array = \ + { \ + .length = _length, \ + .elem_type = __type_integer(_type, _order, _base, _encoding), \ + }, \ }, \ }, -#undef __dynamic_array -#define __dynamic_array(_type, _item, _length) \ +#undef __array +#define __array(_type, _item, _length) \ + __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none) + +#undef __array_text +#define __array_text(_type, _item, _length) \ + __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8) + +#undef __array_hex +#define __array_hex(_type, _item, _length) \ + __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none) + +#undef __dynamic_array_enc_ext +#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \ { \ - .name = #_item, \ - .type = { \ + .name = #_item, \ + .type = \ + { \ .atype = atype_sequence, \ - .name = NULL, \ - .u.sequence.elem_type = #_type, \ - .u.sequence.length_type = "u32", \ + .u.sequence = \ + { \ + .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \ + .elem_type = __type_integer(_type, _order, _base, _encoding), \ + }, \ }, \ }, +#undef __dynamic_array_enc_ext_2 +#define __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, _order, _base, _encoding) \ + __dynamic_array_enc_ext(_type, _item, _length1 + _length2, _order, _base, _encoding) + +#undef __dynamic_array +#define __dynamic_array(_type, _item, _length) \ + __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none) + +#undef __dynamic_array_text +#define __dynamic_array_text(_type, _item, _length) \ + __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8) + +#undef __dynamic_array_hex +#define __dynamic_array_hex(_type, _item, _length) \ + __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none) + +#undef __dynamic_array_text_2 +#define __dynamic_array_text_2(_type, _item, _length1, _length2) \ + __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, __BYTE_ORDER, 10, UTF8) + #undef __string #define __string(_item, _src) \ { \ - .name = #_item, \ - .type = { \ + .name = #_item, \ + .type = \ + { \ .atype = atype_string, \ - .name = NULL, \ - .u.string.encoding = lttng_encode_UTF8, \ + .u.basic.string.encoding = lttng_encode_UTF8, \ }, \ }, +#undef __string_from_user +#define __string_from_user(_item, _src) \ + __string(_item, _src) + #undef TP_STRUCT__entry #define TP_STRUCT__entry(args...) args /* Only one used in this phase */ -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ +#undef DECLARE_EVENT_CLASS_NOARGS +#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \ static const struct lttng_event_field __event_fields___##_name[] = { \ _tstruct \ }; +#undef DECLARE_EVENT_CLASS +#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ + DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \ + PARAMS(_print)) + #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) /* - * Stage 2 of the trace events. + * Stage 3 of the trace events. * - * Create an array of events. + * Create probe callback prototypes. */ -/* Named field types must be defined in lttng-types.h */ - #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ -#undef DEFINE_EVENT -#define DEFINE_EVENT(_template, _name, _proto, _args) \ - { \ - .fields = __event_fields___##_template, \ - .name = #_name, \ - .nr_fields = ARRAY_SIZE(__event_fields___##_template), \ - }, +#undef TP_PROTO +#define TP_PROTO(args...) args -#define TP_ID1(_token, _system) _token##_system -#define TP_ID(_token, _system) TP_ID1(_token, _system) +#undef DECLARE_EVENT_CLASS +#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ +static void __event_probe__##_name(void *__data, _proto); -static const struct lttng_event_desc TP_ID(__event_desc___, TRACE_SYSTEM)[] = { -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) -}; +#undef DECLARE_EVENT_CLASS_NOARGS +#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \ +static void __event_probe__##_name(void *__data); -#undef TP_ID1 -#undef TP_ID +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) /* - * Stage 3 of the trace events. + * Stage 3.9 of the trace events. * - * Create seq file metadata output. + * Create event descriptions. */ -#define TP_ID1(_token, _system) _token##_system -#define TP_ID(_token, _system) TP_ID1(_token, _system) -#define module_init_eval1(_token, _system) module_init(_token##_system) -#define module_init_eval(_token, _system) module_init_eval1(_token, _system) -#define module_exit_eval1(_token, _system) module_exit(_token##_system) -#define module_exit_eval(_token, _system) module_exit_eval1(_token, _system) +/* Named field types must be defined in lttng-types.h */ -static void *TP_ID(__lttng_seq_start__, TRACE_SYSTEM)(struct seq_file *m, - loff_t *pos) -{ - const struct lttng_event_desc *desc = - &TP_ID(__event_desc___, TRACE_SYSTEM)[*pos]; +#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ - if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM) - [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1]) - return NULL; - return (void *) desc; -} +#ifndef TP_PROBE_CB +#define TP_PROBE_CB(_template) &__event_probe__##_template +#endif + +#undef DEFINE_EVENT_MAP_NOARGS +#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \ +static const struct lttng_event_desc __event_desc___##_map = { \ + .fields = __event_fields___##_template, \ + .name = #_map, \ + .probe_callback = (void *) TP_PROBE_CB(_template), \ + .nr_fields = ARRAY_SIZE(__event_fields___##_template), \ + .owner = THIS_MODULE, \ +}; -static void *TP_ID(__lttng_seq_next__, TRACE_SYSTEM)(struct seq_file *m, - void *p, loff_t *ppos) -{ - const struct lttng_event_desc *desc = - &TP_ID(__event_desc___, TRACE_SYSTEM)[++(*ppos)]; +#undef DEFINE_EVENT_MAP +#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \ + DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) - if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM) - [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1]) - return NULL; - return (void *) desc; -} +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) -static void TP_ID(__lttng_seq_stop__, TRACE_SYSTEM)(struct seq_file *m, - void *p) -{ -} -static int TP_ID(__lttng_seq_show__, TRACE_SYSTEM)(struct seq_file *m, - void *p) -{ - const struct lttng_event_desc *desc = p; - int i; - - seq_printf(m, "event {\n" - "\tname = %s;\n" - "\tid = UNKNOWN;\n" - "\tstream = UNKNOWN;\n" - "\tfields = {\n", - desc->name); - for (i = 0; i < desc->nr_fields; i++) { - if (desc->fields[i].type.name) /* Named type */ - seq_printf(m, "\t\t%s", - desc->fields[i].type.name); - else /* Nameless type */ - lttng_print_event_type(m, 2, &desc->fields[i].type); - seq_printf(m, " %s;\n", desc->fields[i].name); - } - seq_printf(m, "\t};\n"); - seq_printf(m, "};\n"); - return 0; -} +/* + * Stage 4 of the trace events. + * + * Create an array of event description pointers. + */ -static const -struct seq_operations TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM) = { - .start = TP_ID(__lttng_seq_start__, TRACE_SYSTEM), - .next = TP_ID(__lttng_seq_next__, TRACE_SYSTEM), - .stop = TP_ID(__lttng_seq_stop__, TRACE_SYSTEM), - .show = TP_ID(__lttng_seq_show__, TRACE_SYSTEM), -}; +/* Named field types must be defined in lttng-types.h */ -static int -TP_ID(__lttng_types_open__, TRACE_SYSTEM)(struct inode *inode, struct file *file) -{ - return seq_open(file, &TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM)); -} +#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ + +#undef DEFINE_EVENT_MAP_NOARGS +#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \ + &__event_desc___##_map, -static const -struct file_operations TP_ID(__lttng_types_fops__, TRACE_SYSTEM) = { - .open = TP_ID(__lttng_types_open__, TRACE_SYSTEM), - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release_private, +#undef DEFINE_EVENT_MAP +#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \ + DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) + +#define TP_ID1(_token, _system) _token##_system +#define TP_ID(_token, _system) TP_ID1(_token, _system) + +static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = { +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) }; -static struct dentry *TP_ID(__lttng_types_dentry__, TRACE_SYSTEM); +#undef TP_ID1 +#undef TP_ID -static int TP_ID(__lttng_types_init__, TRACE_SYSTEM)(void) -{ - int ret = 0; - - TP_ID(__lttng_types_dentry__, TRACE_SYSTEM) = - debugfs_create_file("lttng-events-" __stringify(TRACE_SYSTEM), - S_IWUSR, NULL, NULL, - &TP_ID(__lttng_types_fops__, TRACE_SYSTEM)); - if (IS_ERR(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) - || !TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) { - printk(KERN_ERR "Error creating LTTng type export file\n"); - ret = -ENOMEM; - goto error; - } -error: - return ret; -} -module_init_eval(__lttng_types_init__, TRACE_SYSTEM); +/* + * Stage 5 of the trace events. + * + * Create a toplevel descriptor for the whole probe. + */ -static void TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(void) -{ - debugfs_remove(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)); -} +#define TP_ID1(_token, _system) _token##_system +#define TP_ID(_token, _system) TP_ID1(_token, _system) -module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM); +/* non-const because list head will be modified when registered. */ +static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = { + .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM), + .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)), +}; -#undef module_init_eval -#undef module_exit_eval #undef TP_ID1 #undef TP_ID /* - * Stage 4 of the trace events. + * Stage 6 of the trace events. * * Create static inline function that calculates event size. */ @@ -276,30 +396,50 @@ module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM); /* Named field types must be defined in lttng-types.h */ -#undef __field -#define __field(_type, _item) \ - __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ +#undef __field_full +#define __field_full(_type, _item, _order, _base) \ + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \ __event_len += sizeof(_type); -#undef __field_ext -#define __field_ext(_type, _item, _filter_type) __field(_type, _item) - -#undef __array -#define __array(_type, _item, _length) \ - __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ +#undef __array_enc_ext +#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \ + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \ __event_len += sizeof(_type) * (_length); -#undef __dynamic_array -#define __dynamic_array(_type, _item, _length) \ - __event_len += lib_ring_buffer_align(__event_len, __alignof__(u32)); \ +#undef __dynamic_array_enc_ext +#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32)); \ __event_len += sizeof(u32); \ - __event_len += lib_ring_buffer_align(__event_len, __alignof__(_type)); \ - __event_len += sizeof(_type) * (_length); + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \ + __dynamic_len[__dynamic_len_idx] = (_length); \ + __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \ + __dynamic_len_idx++; + +#undef __dynamic_array_enc_ext_2 +#define __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, _order, _base, _encoding)\ + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32)); \ + __event_len += sizeof(u32); \ + __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \ + __dynamic_len[__dynamic_len_idx] = (_length1); \ + __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \ + __dynamic_len_idx++; \ + __dynamic_len[__dynamic_len_idx] = (_length2); \ + __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \ + __dynamic_len_idx++; #undef __string #define __string(_item, _src) \ __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1; +/* + * strlen_user includes \0. If returns 0, it faulted, so we set size to + * 1 (\0 only). + */ +#undef __string_from_user +#define __string_from_user(_item, _src) \ + __event_len += __dynamic_len[__dynamic_len_idx++] = \ + max_t(size_t, lttng_strlen_user_inatomic(_src), 1); + #undef TP_PROTO #define TP_PROTO(args...) args @@ -321,10 +461,8 @@ static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \ #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - - /* - * Stage 5 of the trace events. + * Stage 7 of the trace events. * * Create static inline function that calculates event payload alignment. */ @@ -333,25 +471,29 @@ static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \ /* Named field types must be defined in lttng-types.h */ -#undef __field -#define __field(_type, _item) \ - __event_align = max_t(size_t, __event_align, __alignof__(_type)); +#undef __field_full +#define __field_full(_type, _item, _order, _base) \ + __event_align = max_t(size_t, __event_align, lttng_alignof(_type)); -#undef __field_ext -#define __field_ext(_type, _item, _filter_type) __field(_type, _item) +#undef __array_enc_ext +#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \ + __event_align = max_t(size_t, __event_align, lttng_alignof(_type)); -#undef __array -#define __array(_type, _item, _length) \ - __event_align = max_t(size_t, __event_align, __alignof__(_type)); +#undef __dynamic_array_enc_ext +#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ + __event_align = max_t(size_t, __event_align, lttng_alignof(u32)); \ + __event_align = max_t(size_t, __event_align, lttng_alignof(_type)); -#undef __dynamic_array -#define __dynamic_array(_type, _item, _length) \ - __event_align = max_t(size_t, __event_align, __alignof__(u32)); \ - __event_align = max_t(size_t, __event_align, __alignof__(_type)); +#undef __dynamic_array_enc_ext_2 +#define __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, _order, _base, _encoding)\ + __dynamic_array_enc_ext(_type, _item, _length1 + _length2, _order, _base, _encoding) #undef __string #define __string(_item, _src) +#undef __string_from_user +#define __string_from_user(_item, _src) + #undef TP_PROTO #define TP_PROTO(args...) args @@ -370,9 +512,53 @@ static inline size_t __event_get_align__##_name(_proto) \ #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) +/* + * Stage 8 of the trace events. + * + * Create structure declaration that allows the "assign" macros to access the + * field types. + */ + +#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ + +/* Named field types must be defined in lttng-types.h */ + +#undef __field_full +#define __field_full(_type, _item, _order, _base) _type _item; + +#undef __array_enc_ext +#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \ + _type _item; + +#undef __dynamic_array_enc_ext +#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ + _type _item; + +#undef __dynamic_array_enc_ext_2 +#define __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, _order, _base, _encoding)\ + __dynamic_array_enc_ext(_type, _item, _length1 + _length2, _order, _base, _encoding) + +#undef __string +#define __string(_item, _src) char _item; + +#undef __string_from_user +#define __string_from_user(_item, _src) \ + __string(_item, _src) + +#undef TP_STRUCT__entry +#define TP_STRUCT__entry(args...) args + +#undef DECLARE_EVENT_CLASS +#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ +struct __event_typemap__##_name { \ + _tstruct \ +}; + +#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) + /* - * Stage 6 of the trace events. + * Stage 9 of the trace events. * * Create the probe function : call even size calculation and write event data * into the buffer. @@ -384,35 +570,41 @@ static inline size_t __event_get_align__##_name(_proto) \ #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */ -#undef __field -#define __field(_type, _item) \ - lib_ring_buffer_align_ctx(&ctx, __alignof__(_type)); \ +#undef __field_full +#define __field_full(_type, _item, _order, _base) \ goto __assign_##_item; \ __end_field_##_item: -#undef __field_ext -#define __field_ext(_type, _item, _filter_type) __field(_type, _item) - -#undef __array -#define __array(_type, _item, _length) \ - lib_ring_buffer_align_ctx(&ctx, __alignof__(_type)); \ +#undef __array_enc_ext +#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ goto __assign_##_item; \ __end_field_##_item: -#undef __dynamic_array -#define __dynamic_array(_type, _item, _length) \ - lib_ring_buffer_align_ctx(&ctx, __alignof__(u32)); \ +#undef __dynamic_array_enc_ext +#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\ goto __assign_##_item##_1; \ __end_field_##_item##_1: \ - lib_ring_buffer_align_ctx(&ctx, __alignof__(_type)); \ goto __assign_##_item##_2; \ __end_field_##_item##_2: +#undef __dynamic_array_enc_ext_2 +#define __dynamic_array_enc_ext_2(_type, _item, _length1, _length2, _order, _base, _encoding)\ + goto __assign_##_item##_1; \ +__end_field_##_item##_1: \ + goto __assign_##_item##_2; \ +__end_field_##_item##_2: \ + goto __assign_##_item##_3; \ +__end_field_##_item##_3: + #undef __string #define __string(_item, _src) \ goto __assign_##_item; \ __end_field_##_item: +#undef __string_from_user +#define __string_from_user(_item, _src) \ + __string(_item, _src) + /* * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to * strcpy(). @@ -421,32 +613,101 @@ __end_field_##_item: #define tp_assign(dest, src) \ __assign_##dest: \ { \ - __typeof__(src) __tmp = (src); \ - __chan->ops->event_write(&ctx, &__tmp, sizeof(src)); \ + __typeof__(__typemap.dest) __tmp = (src); \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp)); \ + __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\ } \ goto __end_field_##dest; -#undef tp_memcpy -#define tp_memcpy(dest, src, len) \ +/* fixed length array memcpy */ +#undef tp_memcpy_gen +#define tp_memcpy_gen(write_ops, dest, src, len) \ __assign_##dest: \ - __chan->ops->event_write(&ctx, src, len); \ + if (0) \ + (void) __typemap.dest; \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \ + __chan->ops->write_ops(&__ctx, src, len); \ goto __end_field_##dest; -#undef tp_memcpy_dyn -#define tp_memcpy_dyn(dest, src, len) \ +#undef tp_memcpy +#define tp_memcpy(dest, src, len) \ + tp_memcpy_gen(event_write, dest, src, len) + +#undef tp_memcpy_from_user +#define tp_memcpy_from_user(dest, src, len) \ + tp_memcpy_gen(event_write_from_user, dest, src, len) + +/* variable length sequence memcpy */ +#undef tp_memcpy_dyn_gen +#define tp_memcpy_dyn_gen(write_ops, dest, src) \ __assign_##dest##_1: \ { \ - __typeof__(len) __tmpl = (len); \ - __chan->ops->event_write(&ctx, &__tmpl, sizeof(u32)); \ + u32 __tmpl = __dynamic_len[__dynamic_len_idx]; \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32)); \ + __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \ } \ goto __end_field_##dest##_1; \ __assign_##dest##_2: \ - __chan->ops->event_write(&ctx, src, len); \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \ + __chan->ops->write_ops(&__ctx, src, \ + sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\ goto __end_field_##dest##_2; +#undef tp_memcpy_dyn_gen_2 +#define tp_memcpy_dyn_gen_2(write_ops, dest, src1, src2) \ +__assign_##dest##_1: \ + { \ + u32 __tmpl = __dynamic_len[__dynamic_len_idx] \ + + __dynamic_len[__dynamic_len_idx + 1]; \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32)); \ + __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \ + } \ + goto __end_field_##dest##_1; \ +__assign_##dest##_2: \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \ + __chan->ops->write_ops(&__ctx, src1, \ + sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\ + goto __end_field_##dest##_2; \ +__assign_##dest##_3: \ + __chan->ops->write_ops(&__ctx, src2, \ + sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\ + goto __end_field_##dest##_3; + +#undef tp_memcpy_dyn +#define tp_memcpy_dyn(dest, src) \ + tp_memcpy_dyn_gen(event_write, dest, src) + +#undef tp_memcpy_dyn_2 +#define tp_memcpy_dyn_2(dest, src1, src2) \ + tp_memcpy_dyn_gen_2(event_write, dest, src1, src2) + +#undef tp_memcpy_dyn_from_user +#define tp_memcpy_dyn_from_user(dest, src) \ + tp_memcpy_dyn_gen(event_write_from_user, dest, src) + +/* + * The string length including the final \0. + */ +#undef tp_copy_string_from_user +#define tp_copy_string_from_user(dest, src) \ + __assign_##dest: \ + { \ + size_t __ustrlen; \ + \ + if (0) \ + (void) __typemap.dest; \ + lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\ + __ustrlen = __get_dynamic_array_len(dest); \ + if (likely(__ustrlen > 1)) { \ + __chan->ops->event_write_from_user(&__ctx, src, \ + __ustrlen - 1); \ + } \ + __chan->ops->event_memset(&__ctx, 0, 1); \ + } \ + goto __end_field_##dest; #undef tp_strcpy #define tp_strcpy(dest, src) \ - tp_memcpy(dest, src, __get_dynamic_array_len(dest)); \ + tp_memcpy(dest, src, __get_dynamic_array_len(dest)) /* Named field types must be defined in lttng-types.h */ @@ -472,725 +733,136 @@ __assign_##dest##_2: \ #undef TP_fast_assign #define TP_fast_assign(args...) args +/* + * For state dump, check that "session" argument (mandatory) matches the + * session this event belongs to. Ensures that we write state dump data only + * into the started session, not into all sessions. + */ +#ifdef TP_SESSION_CHECK +#define _TP_SESSION_CHECK(session, csession) (session == csession) +#else /* TP_SESSION_CHECK */ +#define _TP_SESSION_CHECK(session, csession) 1 +#endif /* TP_SESSION_CHECK */ + +/* + * __dynamic_len array length is twice the number of fields due to + * __dynamic_array_enc_ext_2() and tp_memcpy_dyn_2(), which are the + * worse case, needing 2 entries per field. + */ #undef DECLARE_EVENT_CLASS #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \ static void __event_probe__##_name(void *__data, _proto) \ { \ - struct ltt_event *__event = __data; \ - struct ltt_channel *__chan = __event->chan; \ - struct lib_ring_buffer_ctx ctx; \ + struct lttng_event *__event = __data; \ + struct lttng_channel *__chan = __event->chan; \ + struct lib_ring_buffer_ctx __ctx; \ size_t __event_len, __event_align; \ size_t __dynamic_len_idx = 0; \ - size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \ + size_t __dynamic_len[2 * ARRAY_SIZE(__event_fields___##_name)]; \ + struct __event_typemap__##_name __typemap; \ int __ret; \ \ - if (0) \ + if (0) { \ (void) __dynamic_len_idx; /* don't warn if unused */ \ + (void) __typemap; /* don't warn if unused */ \ + } \ + if (!_TP_SESSION_CHECK(session, __chan->session)) \ + return; \ + if (unlikely(!ACCESS_ONCE(__chan->session->active))) \ + return; \ + if (unlikely(!ACCESS_ONCE(__chan->enabled))) \ + return; \ + if (unlikely(!ACCESS_ONCE(__event->enabled))) \ + return; \ __event_len = __event_get_size__##_name(__dynamic_len, _args); \ __event_align = __event_get_align__##_name(_args); \ - lib_ring_buffer_ctx_init(&ctx, __chan->chan, NULL, __event_len, \ + lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \ __event_align, -1); \ - __ret = __chan->ops->event_reserve(&ctx); \ + __ret = __chan->ops->event_reserve(&__ctx, __event->id); \ if (__ret < 0) \ return; \ /* Control code (field ordering) */ \ _tstruct \ - __chan->ops->event_commit(&ctx); \ + __chan->ops->event_commit(&__ctx); \ return; \ /* Copy code, steered by control code */ \ _assign \ } -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - - -#if 0 - -#include - -/* - * DECLARE_EVENT_CLASS can be used to add a generic function - * handlers for events. That is, if all events have the same - * parameters and just have distinct trace points. - * Each tracepoint can be defined with DEFINE_EVENT and that - * will map the DECLARE_EVENT_CLASS to the tracepoint. - * - * TRACE_EVENT is a one to one mapping between tracepoint and template. - */ -#undef TRACE_EVENT -#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ - DECLARE_EVENT_CLASS(name, \ - PARAMS(proto), \ - PARAMS(args), \ - PARAMS(tstruct), \ - PARAMS(assign), \ - PARAMS(print)); \ - DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args)); - - -#undef __field -#define __field(type, item) type item; - -#undef __field_ext -#define __field_ext(type, item, filter_type) type item; - -#undef __array -#define __array(type, item, len) type item[len]; - -#undef __dynamic_array -#define __dynamic_array(type, item, len) u32 __data_loc_##item; - -#undef __string -#define __string(item, src) __dynamic_array(char, item, -1) - -#undef TP_STRUCT__entry -#define TP_STRUCT__entry(args...) args - -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \ - struct ftrace_raw_##name { \ - struct trace_entry ent; \ - tstruct \ - char __data[0]; \ - }; \ - \ - static struct ftrace_event_class event_class_##name; - -#undef DEFINE_EVENT -#define DEFINE_EVENT(template, name, proto, args) \ - static struct ftrace_event_call __used \ - __attribute__((__aligned__(4))) event_##name - -#undef DEFINE_EVENT_PRINT -#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) - -/* Callbacks are meaningless to ftrace. */ -#undef TRACE_EVENT_FN -#define TRACE_EVENT_FN(name, proto, args, tstruct, \ - assign, print, reg, unreg) \ - TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \ - PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ - -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - - -/* - * Stage 2 of the trace events. - * - * Create static inline function that calculates event size. - */ - -#undef __field -#define __field(type, item) - -#undef __field_ext -#define __field_ext(type, item, filter_type) - -#undef __array -#define __array(type, item, len) - -#undef __dynamic_array -#define __dynamic_array(type, item, len) u32 item; - -#undef __string -#define __string(item, src) __dynamic_array(char, item, -1) - -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ - struct ftrace_data_offsets_##call { \ - tstruct; \ - }; - -#undef DEFINE_EVENT -#define DEFINE_EVENT(template, name, proto, args) - -#undef DEFINE_EVENT_PRINT -#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) - -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - -/* - * Stage 3 of the trace events. - * - * Create the probe function : call even size calculation and write event data - * into the buffer. - */ - -#undef __entry -#define __entry field - -#undef TP_printk -#define TP_printk(fmt, args...) fmt "\n", args - -#undef __get_dynamic_array -#define __get_dynamic_array(field) \ - ((void *)__entry + (__entry->__data_loc_##field & 0xffff)) - -#undef __get_str -#define __get_str(field) (char *)__get_dynamic_array(field) - -#undef __print_flags -#define __print_flags(flag, delim, flag_array...) \ - ({ \ - static const struct trace_print_flags __flags[] = \ - { flag_array, { -1, NULL }}; \ - ftrace_print_flags_seq(p, delim, flag, __flags); \ - }) - -#undef __print_symbolic -#define __print_symbolic(value, symbol_array...) \ - ({ \ - static const struct trace_print_flags symbols[] = \ - { symbol_array, { -1, NULL }}; \ - ftrace_print_symbols_seq(p, value, symbols); \ - }) - -#undef __print_hex -#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len) - -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ -static notrace enum print_line_t \ -ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \ - struct trace_event *trace_event) \ -{ \ - struct ftrace_event_call *event; \ - struct trace_seq *s = &iter->seq; \ - struct ftrace_raw_##call *field; \ - struct trace_entry *entry; \ - struct trace_seq *p = &iter->tmp_seq; \ - int ret; \ - \ - event = container_of(trace_event, struct ftrace_event_call, \ - event); \ - \ - entry = iter->ent; \ - \ - if (entry->type != event->event.type) { \ - WARN_ON_ONCE(1); \ - return TRACE_TYPE_UNHANDLED; \ - } \ - \ - field = (typeof(field))entry; \ - \ - trace_seq_init(p); \ - ret = trace_seq_printf(s, "%s: ", event->name); \ - if (ret) \ - ret = trace_seq_printf(s, print); \ - if (!ret) \ - return TRACE_TYPE_PARTIAL_LINE; \ - \ - return TRACE_TYPE_HANDLED; \ -} \ -static struct trace_event_functions ftrace_event_type_funcs_##call = { \ - .trace = ftrace_raw_output_##call, \ -}; - -#undef DEFINE_EVENT_PRINT -#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ -static notrace enum print_line_t \ -ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \ - struct trace_event *event) \ -{ \ - struct trace_seq *s = &iter->seq; \ - struct ftrace_raw_##template *field; \ - struct trace_entry *entry; \ - struct trace_seq *p = &iter->tmp_seq; \ - int ret; \ - \ - entry = iter->ent; \ - \ - if (entry->type != event_##call.event.type) { \ - WARN_ON_ONCE(1); \ - return TRACE_TYPE_UNHANDLED; \ - } \ - \ - field = (typeof(field))entry; \ - \ - trace_seq_init(p); \ - ret = trace_seq_printf(s, "%s: ", #call); \ - if (ret) \ - ret = trace_seq_printf(s, print); \ - if (!ret) \ - return TRACE_TYPE_PARTIAL_LINE; \ - \ - return TRACE_TYPE_HANDLED; \ -} \ -static struct trace_event_functions ftrace_event_type_funcs_##call = { \ - .trace = ftrace_raw_output_##call, \ -}; - -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - -#undef __field_ext -#define __field_ext(type, item, filter_type) \ - ret = trace_define_field(event_call, #type, #item, \ - offsetof(typeof(field), item), \ - sizeof(field.item), \ - is_signed_type(type), filter_type); \ - if (ret) \ - return ret; - -#undef __field -#define __field(type, item) __field_ext(type, item, FILTER_OTHER) - -#undef __array -#define __array(type, item, len) \ - BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ - ret = trace_define_field(event_call, #type "[" #len "]", #item, \ - offsetof(typeof(field), item), \ - sizeof(field.item), \ - is_signed_type(type), FILTER_OTHER); \ - if (ret) \ - return ret; - -#undef __dynamic_array -#define __dynamic_array(type, item, len) \ - ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \ - offsetof(typeof(field), __data_loc_##item), \ - sizeof(field.__data_loc_##item), \ - is_signed_type(type), FILTER_OTHER); - -#undef __string -#define __string(item, src) __dynamic_array(char, item, -1) - -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \ -static int notrace \ -ftrace_define_fields_##call(struct ftrace_event_call *event_call) \ -{ \ - struct ftrace_raw_##call field; \ - int ret; \ - \ - tstruct; \ - \ - return ret; \ -} - -#undef DEFINE_EVENT -#define DEFINE_EVENT(template, name, proto, args) - -#undef DEFINE_EVENT_PRINT -#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) - -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - -/* - * remember the offset of each array from the beginning of the event. - */ - -#undef __entry -#define __entry entry - -#undef __field -#define __field(type, item) - -#undef __field_ext -#define __field_ext(type, item, filter_type) - -#undef __array -#define __array(type, item, len) - -#undef __dynamic_array -#define __dynamic_array(type, item, len) \ - __data_offsets->item = __data_size + \ - offsetof(typeof(*entry), __data); \ - __data_offsets->item |= (len * sizeof(type)) << 16; \ - __data_size += (len) * sizeof(type); - -#undef __string -#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) - -#undef DECLARE_EVENT_CLASS -#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ -static inline notrace int ftrace_get_offsets_##call( \ - struct ftrace_data_offsets_##call *__data_offsets, proto) \ -{ \ - int __data_size = 0; \ - struct ftrace_raw_##call __maybe_unused *entry; \ - \ - tstruct; \ - \ - return __data_size; \ -} - -#undef DEFINE_EVENT -#define DEFINE_EVENT(template, name, proto, args) - -#undef DEFINE_EVENT_PRINT -#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) - -#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) - -/* - * Stage 4 of the trace events. - * - * Override the macros in to include the following: - * - * For those macros defined with TRACE_EVENT: - * - * static struct ftrace_event_call event_; - * - * static void ftrace_raw_event_(void *__data, proto) - * { - * struct ftrace_event_call *event_call = __data; - * struct ftrace_data_offsets_ __maybe_unused __data_offsets; - * struct ring_buffer_event *event; - * struct ftrace_raw_ *entry; <-- defined in stage 1 - * struct ring_buffer *buffer; - * unsigned long irq_flags; - * int __data_size; - * int pc; - * - * local_save_flags(irq_flags); - * pc = preempt_count(); - * - * __data_size = ftrace_get_offsets_(&__data_offsets, args); - * - * event = trace_current_buffer_lock_reserve(&buffer, - * event_->event.type, - * sizeof(*entry) + __data_size, - * irq_flags, pc); - * if (!event) - * return; - * entry = ring_buffer_event_data(event); - * - * { ; } <-- Here we assign the entries by the __field and - * __array macros. - * - * if (!filter_current_check_discard(buffer, event_call, entry, event)) - * trace_current_buffer_unlock_commit(buffer, - * event, irq_flags, pc); - * } - * - * static struct trace_event ftrace_event_type_ = { - * .trace = ftrace_raw_output_, <-- stage 2 - * }; - * - * static const char print_fmt_[] = ; - * - * static struct ftrace_event_class __used event_class_