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033c55fe2e
The fields of ftrace specific events (events used to save ftrace internal
events like function traces and trace_printk) are generated similarly to
how normal trace event fields are generated. That is, the fields are added
to a trace_events_fields array that saves the name, offset, size,
alignment and signness of the field. It is used to produce the output in
the format file in tracefs so that tooling knows how to parse the binary
data of the trace events.
The issue is that some of the ftrace event structures are packed. The
function graph exit event structures are one of them. The 64 bit calltime
and rettime fields end up 4 byte aligned, but the algorithm to show to
userspace shows them as 8 byte aligned.
The macros that create the ftrace events has one for embedded structure
fields. There's two macros for theses fields:
__field_desc() and __field_packed()
The difference of the latter macro is that it treats the field as packed.
Rename that field to __field_desc_packed() and create replace the
__field_packed() to be a normal field that is packed and have the calltime
and rettime use those.
This showed up on 32bit architectures for function graph time fields. It
had:
~# cat /sys/kernel/tracing/events/ftrace/funcgraph_exit/format
[..]
field:unsigned long func; offset:8; size:4; signed:0;
field:unsigned int depth; offset:12; size:4; signed:0;
field:unsigned int overrun; offset:16; size:4; signed:0;
field:unsigned long long calltime; offset:24; size:8; signed:0;
field:unsigned long long rettime; offset:32; size:8; signed:0;
Notice that overrun is at offset 16 with size 4, where in the structure
calltime is at offset 20 (16 + 4), but it shows the offset at 24. That's
because it used the alignment of unsigned long long when used as a
declaration and not as a member of a structure where it would be aligned
by word size (in this case 4).
By using the proper structure alignment, the format has it at the correct
offset:
~# cat /sys/kernel/tracing/events/ftrace/funcgraph_exit/format
[..]
field:unsigned long func; offset:8; size:4; signed:0;
field:unsigned int depth; offset:12; size:4; signed:0;
field:unsigned int overrun; offset:16; size:4; signed:0;
field:unsigned long long calltime; offset:20; size:8; signed:0;
field:unsigned long long rettime; offset:28; size:8; signed:0;
Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reported-by: "jempty.liang" <imntjempty@163.com>
Link: https://patch.msgid.link/20260204113628.53faec78@gandalf.local.home
Fixes: 04ae87a520 ("ftrace: Rework event_create_dir()")
Closes: https://lore.kernel.org/all/20260130015740.212343-1-imntjempty@163.com/
Closes: https://lore.kernel.org/all/20260202123342.2544795-1-imntjempty@163.com/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
459 lines
11 KiB
C
459 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file defines the trace event structures that go into the ring
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* buffer directly. They are created via macros so that changes for them
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* appear in the format file. Using macros will automate this process.
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*
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* The macro used to create a ftrace data structure is:
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*
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* FTRACE_ENTRY( name, struct_name, id, structure, print )
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*
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* @name: the name used the event name, as well as the name of
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* the directory that holds the format file.
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*
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* @struct_name: the name of the structure that is created.
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*
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* @id: The event identifier that is used to detect what event
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* this is from the ring buffer.
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*
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* @structure: the structure layout
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*
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* - __field( type, item )
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* This is equivalent to declaring
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* type item;
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* in the structure.
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* - __array( type, item, size )
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* This is equivalent to declaring
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* type item[size];
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* in the structure.
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*
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* * for structures within structures, the format of the internal
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* structure is laid out. This allows the internal structure
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* to be deciphered for the format file. Although these macros
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* may become out of sync with the internal structure, they
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* will create a compile error if it happens. Since the
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* internal structures are just tracing helpers, this is not
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* an issue.
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*
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* When an internal structure is used, it should use:
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*
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* __field_struct( type, item )
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*
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* instead of __field. This will prevent it from being shown in
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* the output file. The fields in the structure should use.
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*
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* __field_desc( type, container, item )
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* __array_desc( type, container, item, len )
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*
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* type, item and len are the same as __field and __array, but
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* container is added. This is the name of the item in
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* __field_struct that this is describing.
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*
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*
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* @print: the print format shown to users in the format file.
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*/
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/*
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* Function trace entry - function address and parent function address:
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*/
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FTRACE_ENTRY_REG(function, ftrace_entry,
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TRACE_FN,
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F_STRUCT(
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__field_fn( unsigned long, ip )
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__field_fn( unsigned long, parent_ip )
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__dynamic_array( unsigned long, args )
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),
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F_printk(" %ps <-- %ps",
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(void *)__entry->ip, (void *)__entry->parent_ip),
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perf_ftrace_event_register
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);
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/* Function call entry */
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FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
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TRACE_GRAPH_ENT,
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F_STRUCT(
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__field_struct( struct ftrace_graph_ent, graph_ent )
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__field_desc_packed(unsigned long, graph_ent, func )
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__field_desc_packed(unsigned long, graph_ent, depth )
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__dynamic_array(unsigned long, args )
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),
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F_printk("--> %ps (%lu)", (void *)__entry->func, __entry->depth)
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);
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#ifdef CONFIG_FUNCTION_GRAPH_RETADDR
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/* Function call entry with a return address */
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FTRACE_ENTRY_PACKED(fgraph_retaddr_entry, fgraph_retaddr_ent_entry,
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TRACE_GRAPH_RETADDR_ENT,
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F_STRUCT(
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__field_struct( struct fgraph_retaddr_ent, graph_rent )
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__field_desc_packed( unsigned long, graph_rent.ent, func )
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__field_desc_packed( unsigned long, graph_rent.ent, depth )
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__field_desc_packed( unsigned long, graph_rent, retaddr )
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__dynamic_array(unsigned long, args )
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),
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F_printk("--> %ps (%lu) <- %ps", (void *)__entry->func, __entry->depth,
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(void *)__entry->retaddr)
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);
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#else
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#ifndef fgraph_retaddr_ent_entry
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#define fgraph_retaddr_ent_entry ftrace_graph_ent_entry
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#endif
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#endif
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#ifdef CONFIG_FUNCTION_GRAPH_RETVAL
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/* Function return entry */
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FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
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TRACE_GRAPH_RET,
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F_STRUCT(
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__field_struct( struct ftrace_graph_ret, ret )
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__field_desc_packed( unsigned long, ret, func )
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__field_desc_packed( unsigned long, ret, retval )
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__field_desc_packed( unsigned int, ret, depth )
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__field_desc_packed( unsigned int, ret, overrun )
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__field_packed(unsigned long long, calltime)
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__field_packed(unsigned long long, rettime )
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),
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F_printk("<-- %ps (%u) (start: %llx end: %llx) over: %u retval: %lx",
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(void *)__entry->func, __entry->depth,
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__entry->calltime, __entry->rettime,
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__entry->depth, __entry->retval)
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);
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#else
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/* Function return entry */
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FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
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TRACE_GRAPH_RET,
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F_STRUCT(
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__field_struct( struct ftrace_graph_ret, ret )
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__field_desc_packed( unsigned long, ret, func )
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__field_desc_packed( unsigned int, ret, depth )
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__field_desc_packed( unsigned int, ret, overrun )
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__field_packed(unsigned long long, calltime )
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__field_packed(unsigned long long, rettime )
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),
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F_printk("<-- %ps (%u) (start: %llx end: %llx) over: %u",
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(void *)__entry->func, __entry->depth,
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__entry->calltime, __entry->rettime,
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__entry->depth)
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);
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#endif
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/*
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* Context switch trace entry - which task (and prio) we switched from/to:
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*
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* This is used for both wakeup and context switches. We only want
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* to create one structure, but we need two outputs for it.
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*/
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#define FTRACE_CTX_FIELDS \
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__field( unsigned int, prev_pid ) \
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__field( unsigned int, next_pid ) \
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__field( unsigned int, next_cpu ) \
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__field( unsigned char, prev_prio ) \
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__field( unsigned char, prev_state ) \
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__field( unsigned char, next_prio ) \
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__field( unsigned char, next_state )
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FTRACE_ENTRY(context_switch, ctx_switch_entry,
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TRACE_CTX,
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F_STRUCT(
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FTRACE_CTX_FIELDS
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),
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F_printk("%u:%u:%u ==> %u:%u:%u [%03u]",
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__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
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__entry->next_pid, __entry->next_prio, __entry->next_state,
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__entry->next_cpu)
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);
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/*
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* FTRACE_ENTRY_DUP only creates the format file, it will not
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* create another structure.
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*/
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FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
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TRACE_WAKE,
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F_STRUCT(
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FTRACE_CTX_FIELDS
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),
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F_printk("%u:%u:%u ==+ %u:%u:%u [%03u]",
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__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
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__entry->next_pid, __entry->next_prio, __entry->next_state,
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__entry->next_cpu)
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);
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/*
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* Stack-trace entry:
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*/
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#define FTRACE_STACK_ENTRIES 8
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FTRACE_ENTRY(kernel_stack, stack_entry,
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TRACE_STACK,
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F_STRUCT(
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__field( int, size )
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__stack_array( unsigned long, caller, FTRACE_STACK_ENTRIES, size)
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),
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F_printk("\t=> %ps\n\t=> %ps\n\t=> %ps\n"
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"\t=> %ps\n\t=> %ps\n\t=> %ps\n"
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"\t=> %ps\n\t=> %ps\n",
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(void *)__entry->caller[0], (void *)__entry->caller[1],
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(void *)__entry->caller[2], (void *)__entry->caller[3],
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(void *)__entry->caller[4], (void *)__entry->caller[5],
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(void *)__entry->caller[6], (void *)__entry->caller[7])
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);
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FTRACE_ENTRY(user_stack, userstack_entry,
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TRACE_USER_STACK,
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F_STRUCT(
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__field( unsigned int, tgid )
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__array( unsigned long, caller, FTRACE_STACK_ENTRIES )
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),
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F_printk("\t=> %ps\n\t=> %ps\n\t=> %ps\n"
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"\t=> %ps\n\t=> %ps\n\t=> %ps\n"
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"\t=> %ps\n\t=> %ps\n",
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(void *)__entry->caller[0], (void *)__entry->caller[1],
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(void *)__entry->caller[2], (void *)__entry->caller[3],
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(void *)__entry->caller[4], (void *)__entry->caller[5],
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(void *)__entry->caller[6], (void *)__entry->caller[7])
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);
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/*
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* trace_printk entry:
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*/
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FTRACE_ENTRY(bprint, bprint_entry,
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TRACE_BPRINT,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( const char *, fmt )
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__dynamic_array( u32, buf )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->fmt)
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);
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FTRACE_ENTRY_REG(print, print_entry,
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TRACE_PRINT,
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F_STRUCT(
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__field( unsigned long, ip )
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__dynamic_array( char, buf )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->buf),
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ftrace_event_register
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);
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FTRACE_ENTRY(raw_data, raw_data_entry,
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TRACE_RAW_DATA,
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F_STRUCT(
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__field( unsigned int, id )
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__dynamic_array( char, buf )
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),
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F_printk("id:%04x %08x",
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__entry->id, (int)__entry->buf[0])
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);
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FTRACE_ENTRY(bputs, bputs_entry,
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TRACE_BPUTS,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( const char *, str )
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),
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F_printk("%ps: %s",
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(void *)__entry->ip, __entry->str)
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);
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FTRACE_ENTRY(mmiotrace_rw, trace_mmiotrace_rw,
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TRACE_MMIO_RW,
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F_STRUCT(
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__field_struct( struct mmiotrace_rw, rw )
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__field_desc( resource_size_t, rw, phys )
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__field_desc( unsigned long, rw, value )
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__field_desc( unsigned long, rw, pc )
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__field_desc( int, rw, map_id )
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__field_desc( unsigned char, rw, opcode )
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__field_desc( unsigned char, rw, width )
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),
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F_printk("%lx %lx %lx %d %x %x",
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(unsigned long)__entry->phys, __entry->value, __entry->pc,
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__entry->map_id, __entry->opcode, __entry->width)
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);
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FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
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TRACE_MMIO_MAP,
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F_STRUCT(
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__field_struct( struct mmiotrace_map, map )
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__field_desc( resource_size_t, map, phys )
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__field_desc( unsigned long, map, virt )
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__field_desc( unsigned long, map, len )
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__field_desc( int, map, map_id )
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__field_desc( unsigned char, map, opcode )
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),
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F_printk("%lx %lx %lx %d %x",
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(unsigned long)__entry->phys, __entry->virt, __entry->len,
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__entry->map_id, __entry->opcode)
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);
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#define TRACE_FUNC_SIZE 30
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#define TRACE_FILE_SIZE 20
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FTRACE_ENTRY(branch, trace_branch,
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TRACE_BRANCH,
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F_STRUCT(
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__field( unsigned int, line )
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__array( char, func, TRACE_FUNC_SIZE+1 )
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__array( char, file, TRACE_FILE_SIZE+1 )
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__field( char, correct )
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__field( char, constant )
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),
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F_printk("%u:%s:%s (%u)%s",
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__entry->line,
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__entry->func, __entry->file, __entry->correct,
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__entry->constant ? " CONSTANT" : "")
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);
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FTRACE_ENTRY(hwlat, hwlat_entry,
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TRACE_HWLAT,
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F_STRUCT(
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__field( u64, duration )
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__field( u64, outer_duration )
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__field( u64, nmi_total_ts )
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__field_struct( struct timespec64, timestamp )
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__field_desc( s64, timestamp, tv_sec )
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__field_desc( long, timestamp, tv_nsec )
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__field( unsigned int, nmi_count )
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__field( unsigned int, seqnum )
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__field( unsigned int, count )
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),
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F_printk("cnt:%u\tts:%010llu.%010lu\tinner:%llu\touter:%llu\tcount:%d\tnmi-ts:%llu\tnmi-count:%u\n",
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__entry->seqnum,
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__entry->tv_sec,
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__entry->tv_nsec,
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__entry->duration,
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__entry->outer_duration,
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__entry->count,
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__entry->nmi_total_ts,
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__entry->nmi_count)
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);
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#define FUNC_REPEATS_GET_DELTA_TS(entry) \
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(((u64)(entry)->top_delta_ts << 32) | (entry)->bottom_delta_ts) \
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FTRACE_ENTRY(func_repeats, func_repeats_entry,
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TRACE_FUNC_REPEATS,
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F_STRUCT(
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__field( unsigned long, ip )
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__field( unsigned long, parent_ip )
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__field( u16 , count )
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__field( u16 , top_delta_ts )
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__field( u32 , bottom_delta_ts )
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),
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F_printk(" %ps <-%ps\t(repeats:%u delta: -%llu)",
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(void *)__entry->ip,
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(void *)__entry->parent_ip,
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__entry->count,
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FUNC_REPEATS_GET_DELTA_TS(__entry))
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);
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FTRACE_ENTRY(osnoise, osnoise_entry,
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TRACE_OSNOISE,
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F_STRUCT(
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__field( u64, noise )
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__field( u64, runtime )
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__field( u64, max_sample )
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__field( unsigned int, hw_count )
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__field( unsigned int, nmi_count )
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__field( unsigned int, irq_count )
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__field( unsigned int, softirq_count )
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__field( unsigned int, thread_count )
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),
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F_printk("noise:%llu\tmax_sample:%llu\thw:%u\tnmi:%u\tirq:%u\tsoftirq:%u\tthread:%u\n",
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__entry->noise,
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__entry->max_sample,
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__entry->hw_count,
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__entry->nmi_count,
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__entry->irq_count,
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__entry->softirq_count,
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__entry->thread_count)
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);
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FTRACE_ENTRY(timerlat, timerlat_entry,
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TRACE_TIMERLAT,
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F_STRUCT(
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__field( unsigned int, seqnum )
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__field( int, context )
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__field( u64, timer_latency )
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),
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F_printk("seq:%u\tcontext:%d\ttimer_latency:%llu\n",
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__entry->seqnum,
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__entry->context,
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__entry->timer_latency)
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);
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