stage5_get_offsets.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3/* Stage 5 definitions for creating trace events */
  4
  5/*
  6 * remember the offset of each array from the beginning of the event.
  7 */
  8
  9#undef __entry
 10#define __entry entry
 11
 12#ifndef __STAGE5_STRING_SRC_H
 13#define __STAGE5_STRING_SRC_H
 14static inline const char *__string_src(const char *str)
 15{
 16       if (!str)
 17	       return EVENT_NULL_STR;
 18       return str;
 19}
 20#endif /* __STAGE5_STRING_SRC_H */
 21
 22/*
 23 * Fields should never declare an array: i.e. __field(int, arr[5])
 24 * If they do, it will cause issues in parsing and possibly corrupt the
 25 * events. To prevent that from happening, test the sizeof() a fictitious
 26 * type called "struct _test_no_array_##item" which will fail if "item"
 27 * contains array elements (like "arr[5]").
 28 *
 29 * If you hit this, use __array(int, arr, 5) instead.
 30 */
 31#undef __field
 32#define __field(type, item)					\
 33	{ (void)sizeof(struct _test_no_array_##item *); }
 34
 35#undef __field_ext
 36#define __field_ext(type, item, filter_type)			\
 37	{ (void)sizeof(struct _test_no_array_##item *); }
 38
 39#undef __field_struct
 40#define __field_struct(type, item)				\
 41	{ (void)sizeof(struct _test_no_array_##item *); }
 42
 43#undef __field_struct_ext
 44#define __field_struct_ext(type, item, filter_type)		\
 45	{ (void)sizeof(struct _test_no_array_##item *); }
 46
 47#undef __array
 48#define __array(type, item, len)
 49
 50#undef __dynamic_array
 51#define __dynamic_array(type, item, len)				\
 52	__item_length = (len) * sizeof(type);				\
 53	__data_offsets->item = __data_size +				\
 54			       offsetof(typeof(*entry), __data);	\
 55	__data_offsets->item |= __item_length << 16;			\
 56	__data_size += __item_length;
 57
 58#undef __string
 59#define __string(item, src) __dynamic_array(char, item,			\
 60		    strlen(__string_src(src)) + 1)			\
 61	__data_offsets->item##_ptr_ = src;
 62
 63#undef __string_len
 64#define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1)\
 65	__data_offsets->item##_ptr_ = src;
 66
 67#undef __vstring
 68#define __vstring(item, fmt, ap) __dynamic_array(char, item,		\
 69		      __trace_event_vstr_len(fmt, ap))
 70
 71#undef __rel_dynamic_array
 72#define __rel_dynamic_array(type, item, len)				\
 73	__item_length = (len) * sizeof(type);				\
 74	__data_offsets->item = __data_size +				\
 75			       offsetof(typeof(*entry), __data) -	\
 76			       offsetof(typeof(*entry), __rel_loc_##item) -	\
 77			       sizeof(u32);				\
 78	__data_offsets->item |= __item_length << 16;			\
 79	__data_size += __item_length;
 80
 81#undef __rel_string
 82#define __rel_string(item, src) __rel_dynamic_array(char, item,		\
 83		    strlen(__string_src(src)) + 1)			\
 84	__data_offsets->item##_ptr_ = src;
 85
 86#undef __rel_string_len
 87#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1)\
 88	__data_offsets->item##_ptr_ = src;
 89
 90/*
 91 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 92 * num_possible_cpus().
 93 */
 94#define __bitmask_size_in_bytes_raw(nr_bits)	\
 95	(((nr_bits) + 7) / 8)
 96
 97#define __bitmask_size_in_longs(nr_bits)			\
 98	((__bitmask_size_in_bytes_raw(nr_bits) +		\
 99	  ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
100
101/*
102 * __bitmask_size_in_bytes is the number of bytes needed to hold
103 * num_possible_cpus() padded out to the nearest long. This is what
104 * is saved in the buffer, just to be consistent.
105 */
106#define __bitmask_size_in_bytes(nr_bits)				\
107	(__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
108
109#undef __bitmask
110#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,	\
111					 __bitmask_size_in_longs(nr_bits))
112
113#undef __cpumask
114#define __cpumask(item) __bitmask(item, nr_cpumask_bits)
115
116#undef __rel_bitmask
117#define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item,	\
118					 __bitmask_size_in_longs(nr_bits))
119
120#undef __rel_cpumask
121#define __rel_cpumask(item) __rel_bitmask(item, nr_cpumask_bits)
122
123#undef __sockaddr
124#define __sockaddr(field, len) __dynamic_array(u8, field, len)
125
126#undef __rel_sockaddr
127#define __rel_sockaddr(field, len) __rel_dynamic_array(u8, field, len)