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Updates for tracing and bootconfig:

Browse Source 
- Add support for "bool" type in synthetic events
 
 - Add per instance tracing for bootconfig
 
 - Support perf-style return probe ("SYMBOL%return") in kprobes and uprobes
 
 - Allow for kprobes to be enabled earlier in boot up
 
 - Added tracepoint helper function to allow testing if tracepoints are
   enabled in headers
 
 - Synthetic events can now have dynamic strings (variable length)
 
 - Various fixes and cleanups
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Merge tag 'trace-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:
 "Updates for tracing and bootconfig:

   - Add support for "bool" type in synthetic events

   - Add per instance tracing for bootconfig

   - Support perf-style return probe ("SYMBOL%return") in kprobes and
     uprobes

   - Allow for kprobes to be enabled earlier in boot up

   - Added tracepoint helper function to allow testing if tracepoints
     are enabled in headers

   - Synthetic events can now have dynamic strings (variable length)

   - Various fixes and cleanups"

* tag 'trace-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (58 commits)
  tracing: support "bool" type in synthetic trace events
  selftests/ftrace: Add test case for synthetic event syntax errors
  tracing: Handle synthetic event array field type checking correctly
  selftests/ftrace: Change synthetic event name for inter-event-combined test
  tracing: Add synthetic event error logging
  tracing: Check that the synthetic event and field names are legal
  tracing: Move is_good_name() from trace_probe.h to trace.h
  tracing: Don't show dynamic string internals in synthetic event description
  tracing: Fix some typos in comments
  tracing/boot: Add ftrace.instance.*.alloc_snapshot option
  tracing: Fix race in trace_open and buffer resize call
  tracing: Check return value of __create_val_fields() before using its result
  tracing: Fix synthetic print fmt check for use of __get_str()
  tracing: Remove a pointless assignment
  ftrace: ftrace_global_list is renamed to ftrace_ops_list
  ftrace: Format variable declarations of ftrace_allocate_records
  ftrace: Simplify the calculation of page number for ftrace_page->records
  ftrace: Simplify the dyn_ftrace->flags macro
  ftrace: Simplify the hash calculation
  ftrace: Use fls() to get the bits for dup_hash()
  ...
This commit is contained in:
Linus Torvalds 2020-10-15 15:51:28 -07:00
commit fefa636d81
45 changed files with 1705 additions and 332 deletions
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38
Documentation/trace/boottime-trace.rst
View File

@ -61,6 +61,10 @@ These options can be used for each instance including global ftrace node.
ftrace.[instance.INSTANCE.]options = OPT1[, OPT2[...]]
Enable given ftrace options.
ftrace.[instance.INSTANCE.]tracing_on = 0|1
Enable/Disable tracing on this instance when starting boot-time tracing.
(you can enable it by the "traceon" event trigger action)
ftrace.[instance.INSTANCE.]trace_clock = CLOCK
Set given CLOCK to ftrace's trace_clock.
@ -116,6 +120,20 @@ instance node, but those are also visible from other instances. So please
take care for event name conflict.
When to Start
=============
All boot-time tracing options starting with ``ftrace`` will be enabled at the
end of core_initcall. This means you can trace the events from postcore_initcall.
Most of the subsystems and architecture dependent drivers will be initialized
after that (arch_initcall or subsys_initcall). Thus, you can trace those with
boot-time tracing.
If you want to trace events before core_initcall, you can use the options
starting with ``kernel``. Some of them will be enabled eariler than the initcall
processing (for example,. ``kernel.ftrace=function`` and ``kernel.trace_event``
will start before the initcall.)
Examples
========
@ -164,6 +182,26 @@ is for tracing functions starting with "user\_", and others tracing
The instance node also accepts event nodes so that each instance
can customize its event tracing.
With the trigger action and kprobes, you can trace function-graph while
a function is called. For example, this will trace all function calls in
the pci_proc_init()::
ftrace {
tracing_on = 0
tracer = function_graph
event.kprobes {
start_event {
probes = "pci_proc_init"
actions = "traceon"
}
end_event {
probes = "pci_proc_init%return"
actions = "traceoff"
}
}
}
This boot-time tracing also supports ftrace kernel parameters via boot
config.
For example, following kernel parameters::

15
Documentation/trace/events.rst
View File

@ -589,8 +589,19 @@ name::
{ .type = "int", .name = "my_int_field" },
};
See synth_field_size() for available types. If field_name contains [n]
the field is considered to be an array.
See synth_field_size() for available types.
If field_name contains [n], the field is considered to be a static array.
If field_names contains[] (no subscript), the field is considered to
be a dynamic array, which will only take as much space in the event as
is required to hold the array.
Because space for an event is reserved before assigning field values
to the event, using dynamic arrays implies that the piecewise
in-kernel API described below can't be used with dynamic arrays. The
other non-piecewise in-kernel APIs can, however, be used with dynamic
arrays.
If the event is created from within a module, a pointer to the module
must be passed to synth_event_create(). This will ensure that the

18
Documentation/trace/histogram.rst
View File

@ -1776,6 +1776,24 @@ consisting of the name of the new event along with one or more
variables and their types, which can be any valid field type,
separated by semicolons, to the tracing/synthetic_events file.
See synth_field_size() for available types.
If field_name contains [n], the field is considered to be a static array.
If field_names contains[] (no subscript), the field is considered to
be a dynamic array, which will only take as much space in the event as
is required to hold the array.
A string field can be specified using either the static notation:
char name[32];
Or the dynamic:
char name[];
The size limit for either is 256.
For instance, the following creates a new event named 'wakeup_latency'
with 3 fields: lat, pid, and prio. Each of those fields is simply a
variable reference to a variable on another event::

2
Documentation/trace/kprobetrace.rst
View File

@ -30,6 +30,7 @@ Synopsis of kprobe_events
p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe
r[MAXACTIVE][:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe
p:[GRP/]EVENT] [MOD:]SYM[+0]%return [FETCHARGS] : Set a return probe
-:[GRP/]EVENT : Clear a probe
GRP : Group name. If omitted, use "kprobes" for it.
@ -37,6 +38,7 @@ Synopsis of kprobe_events
based on SYM+offs or MEMADDR.
MOD : Module name which has given SYM.
SYM[+offs] : Symbol+offset where the probe is inserted.
SYM%return : Return address of the symbol
MEMADDR : Address where the probe is inserted.
MAXACTIVE : Maximum number of instances of the specified function that
can be probed simultaneously, or 0 for the default value

27
Documentation/trace/tracepoints.rst
View File

@ -146,3 +146,30 @@ with jump labels and avoid conditional branches.
define tracepoints. Check http://lwn.net/Articles/379903,
http://lwn.net/Articles/381064 and http://lwn.net/Articles/383362
for a series of articles with more details.
If you require calling a tracepoint from a header file, it is not
recommended to call one directly or to use the trace_<tracepoint>_enabled()
function call, as tracepoints in header files can have side effects if a
header is included from a file that has CREATE_TRACE_POINTS set, as
well as the trace_<tracepoint>() is not that small of an inline
and can bloat the kernel if used by other inlined functions. Instead,
include tracepoint-defs.h and use tracepoint_enabled().
In a C file::
void do_trace_foo_bar_wrapper(args)
{
trace_foo_bar(args);
}
In the header file::
DECLARE_TRACEPOINT(foo_bar);
static inline void some_inline_function()
{
[..]
if (tracepoint_enabled(foo_bar))
do_trace_foo_bar_wrapper(args);
[..]
}

2
Documentation/trace/uprobetracer.rst
View File

@ -28,6 +28,7 @@ Synopsis of uprobe_tracer
p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe
r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe)
p[:[GRP/]EVENT] PATH:OFFSET%return [FETCHARGS] : Set a return uprobe (uretprobe)
-:[GRP/]EVENT : Clear uprobe or uretprobe event
GRP : Group name. If omitted, "uprobes" is the default value.
@ -35,6 +36,7 @@ Synopsis of uprobe_tracer
on PATH+OFFSET.
PATH : Path to an executable or a library.
OFFSET : Offset where the probe is inserted.
OFFSET%return : Offset where the return probe is inserted.
FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG

1
MAINTAINERS
View File

@ -6626,6 +6626,7 @@ F: fs/proc/bootconfig.c
F: include/linux/bootconfig.h
F: lib/bootconfig.c
F: tools/bootconfig/*
F: tools/bootconfig/scripts/*
EXYNOS DP DRIVER
M: Jingoo Han <jingoohan1@gmail.com>

20
arch/x86/include/asm/msr.h
View File

@ -60,22 +60,20 @@ struct saved_msrs {
#define EAX_EDX_RET(val, low, high) "=A" (val)
#endif
#ifdef CONFIG_TRACEPOINTS
/*
* Be very careful with includes. This header is prone to include loops.
*/
#include <asm/atomic.h>
#include <linux/tracepoint-defs.h>
extern struct tracepoint __tracepoint_read_msr;
extern struct tracepoint __tracepoint_write_msr;
extern struct tracepoint __tracepoint_rdpmc;
#define msr_tracepoint_active(t) static_key_false(&(t).key)
#ifdef CONFIG_TRACEPOINTS
DECLARE_TRACEPOINT(read_msr);
DECLARE_TRACEPOINT(write_msr);
DECLARE_TRACEPOINT(rdpmc);
extern void do_trace_write_msr(unsigned int msr, u64 val, int failed);
extern void do_trace_read_msr(unsigned int msr, u64 val, int failed);
extern void do_trace_rdpmc(unsigned int msr, u64 val, int failed);
#else
#define msr_tracepoint_active(t) false
static inline void do_trace_write_msr(unsigned int msr, u64 val, int failed) {}
static inline void do_trace_read_msr(unsigned int msr, u64 val, int failed) {}
static inline void do_trace_rdpmc(unsigned int msr, u64 val, int failed) {}
@ -128,7 +126,7 @@ static inline unsigned long long native_read_msr(unsigned int msr)
val = __rdmsr(msr);
if (msr_tracepoint_active(__tracepoint_read_msr))
if (tracepoint_enabled(read_msr))
do_trace_read_msr(msr, val, 0);
return val;
@ -150,7 +148,7 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
_ASM_EXTABLE(2b, 3b)
: [err] "=r" (*err), EAX_EDX_RET(val, low, high)
: "c" (msr), [fault] "i" (-EIO));
if (msr_tracepoint_active(__tracepoint_read_msr))
if (tracepoint_enabled(read_msr))
do_trace_read_msr(msr, EAX_EDX_VAL(val, low, high), *err);
return EAX_EDX_VAL(val, low, high);
}
@ -161,7 +159,7 @@ native_write_msr(unsigned int msr, u32 low, u32 high)
{
__wrmsr(msr, low, high);
if (msr_tracepoint_active(__tracepoint_write_msr))
if (tracepoint_enabled(write_msr))
do_trace_write_msr(msr, ((u64)high << 32 | low), 0);
}
@ -181,7 +179,7 @@ native_write_msr_safe(unsigned int msr, u32 low, u32 high)
: "c" (msr), "0" (low), "d" (high),
[fault] "i" (-EIO)
: "memory");
if (msr_tracepoint_active(__tracepoint_write_msr))
if (tracepoint_enabled(write_msr))
do_trace_write_msr(msr, ((u64)high << 32 | low), err);
return err;
}
@ -248,7 +246,7 @@ static inline unsigned long long native_read_pmc(int counter)
DECLARE_ARGS(val, low, high);
asm volatile("rdpmc" : EAX_EDX_RET(val, low, high) : "c" (counter));
if (msr_tracepoint_active(__tracepoint_rdpmc))
if (tracepoint_enabled(rdpmc))
do_trace_rdpmc(counter, EAX_EDX_VAL(val, low, high), 0);
return EAX_EDX_VAL(val, low, high);
}

11
include/linux/ftrace.h
View File

@ -217,11 +217,11 @@ extern struct ftrace_ops __rcu *ftrace_ops_list;
extern struct ftrace_ops ftrace_list_end;
/*
* Traverse the ftrace_global_list, invoking all entries. The reason that we
* Traverse the ftrace_ops_list, invoking all entries. The reason that we
* can use rcu_dereference_raw_check() is that elements removed from this list
* are simply leaked, so there is no need to interact with a grace-period
* mechanism. The rcu_dereference_raw_check() calls are needed to handle
* concurrent insertions into the ftrace_global_list.
* concurrent insertions into the ftrace_ops_list.
*
* Silly Alpha and silly pointer-speculation compiler optimizations!
*/
@ -432,7 +432,7 @@ bool is_ftrace_trampoline(unsigned long addr);
* DIRECT - there is a direct function to call
*
* When a new ftrace_ops is registered and wants a function to save
* pt_regs, the rec->flag REGS is set. When the function has been
* pt_regs, the rec->flags REGS is set. When the function has been
* set up to save regs, the REG_EN flag is set. Once a function
* starts saving regs it will do so until all ftrace_ops are removed
* from tracing that function.
@ -450,12 +450,9 @@ enum {
};
#define FTRACE_REF_MAX_SHIFT 23
#define FTRACE_FL_BITS 9
#define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1)
#define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
#define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
#define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
#define ftrace_rec_count(rec) ((rec)->flags & FTRACE_REF_MAX)
struct dyn_ftrace {
unsigned long ip; /* address of mcount call-site */

42
include/linux/page_ref.h
View File

@ -7,13 +7,13 @@
#include <linux/page-flags.h>
#include <linux/tracepoint-defs.h>
extern struct tracepoint __tracepoint_page_ref_set;
extern struct tracepoint __tracepoint_page_ref_mod;
extern struct tracepoint __tracepoint_page_ref_mod_and_test;
extern struct tracepoint __tracepoint_page_ref_mod_and_return;
extern struct tracepoint __tracepoint_page_ref_mod_unless;
extern struct tracepoint __tracepoint_page_ref_freeze;
extern struct tracepoint __tracepoint_page_ref_unfreeze;
DECLARE_TRACEPOINT(page_ref_set);
DECLARE_TRACEPOINT(page_ref_mod);
DECLARE_TRACEPOINT(page_ref_mod_and_test);
DECLARE_TRACEPOINT(page_ref_mod_and_return);
DECLARE_TRACEPOINT(page_ref_mod_unless);
DECLARE_TRACEPOINT(page_ref_freeze);
DECLARE_TRACEPOINT(page_ref_unfreeze);
#ifdef CONFIG_DEBUG_PAGE_REF
@ -24,7 +24,7 @@ extern struct tracepoint __tracepoint_page_ref_unfreeze;
*
* See trace_##name##_enabled(void) in include/linux/tracepoint.h
*/
#define page_ref_tracepoint_active(t) static_key_false(&(t).key)
#define page_ref_tracepoint_active(t) tracepoint_enabled(t)
extern void __page_ref_set(struct page *page, int v);
extern void __page_ref_mod(struct page *page, int v);
@ -75,7 +75,7 @@ static inline int page_count(struct page *page)
static inline void set_page_count(struct page *page, int v)
{
atomic_set(&page->_refcount, v);
if (page_ref_tracepoint_active(__tracepoint_page_ref_set))
if (page_ref_tracepoint_active(page_ref_set))
__page_ref_set(page, v);
}
@ -91,14 +91,14 @@ static inline void init_page_count(struct page *page)
static inline void page_ref_add(struct page *page, int nr)
{
atomic_add(nr, &page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod))
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, nr);
}
static inline void page_ref_sub(struct page *page, int nr)
{
atomic_sub(nr, &page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod))
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, -nr);
}
@ -106,7 +106,7 @@ static inline int page_ref_sub_return(struct page *page, int nr)
{
int ret = atomic_sub_return(nr, &page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, -nr, ret);
return ret;
}
@ -114,14 +114,14 @@ static inline int page_ref_sub_return(struct page *page, int nr)
static inline void page_ref_inc(struct page *page)
{
atomic_inc(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod))
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, 1);
}
static inline void page_ref_dec(struct page *page)
{
atomic_dec(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod))
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, -1);
}
@ -129,7 +129,7 @@ static inline int page_ref_sub_and_test(struct page *page, int nr)
{
int ret = atomic_sub_and_test(nr, &page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_test))
if (page_ref_tracepoint_active(page_ref_mod_and_test))
__page_ref_mod_and_test(page, -nr, ret);
return ret;
}
@ -138,7 +138,7 @@ static inline int page_ref_inc_return(struct page *page)
{
int ret = atomic_inc_return(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, 1, ret);
return ret;
}
@ -147,7 +147,7 @@ static inline int page_ref_dec_and_test(struct page *page)
{
int ret = atomic_dec_and_test(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_test))
if (page_ref_tracepoint_active(page_ref_mod_and_test))
__page_ref_mod_and_test(page, -1, ret);
return ret;
}
@ -156,7 +156,7 @@ static inline int page_ref_dec_return(struct page *page)
{
int ret = atomic_dec_return(&page->_refcount);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return))
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, -1, ret);
return ret;
}
@ -165,7 +165,7 @@ static inline int page_ref_add_unless(struct page *page, int nr, int u)
{
int ret = atomic_add_unless(&page->_refcount, nr, u);
if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_unless))
if (page_ref_tracepoint_active(page_ref_mod_unless))
__page_ref_mod_unless(page, nr, ret);
return ret;
}
@ -174,7 +174,7 @@ static inline int page_ref_freeze(struct page *page, int count)
{
int ret = likely(atomic_cmpxchg(&page->_refcount, count, 0) == count);
if (page_ref_tracepoint_active(__tracepoint_page_ref_freeze))
if (page_ref_tracepoint_active(page_ref_freeze))
__page_ref_freeze(page, count, ret);
return ret;
}
@ -185,7 +185,7 @@ static inline void page_ref_unfreeze(struct page *page, int count)
VM_BUG_ON(count == 0);
atomic_set_release(&page->_refcount, count);
if (page_ref_tracepoint_active(__tracepoint_page_ref_unfreeze))
if (page_ref_tracepoint_active(page_ref_unfreeze))
__page_ref_unfreeze(page, count);
}

34
include/linux/tracepoint-defs.h
View File

@ -53,4 +53,38 @@ struct bpf_raw_event_map {
u32 writable_size;
} __aligned(32);
/*
* If a tracepoint needs to be called from a header file, it is not
* recommended to call it directly, as tracepoints in header files
* may cause side-effects and bloat the kernel. Instead, use
* tracepoint_enabled() to test if the tracepoint is enabled, then if
* it is, call a wrapper function defined in a C file that will then
* call the tracepoint.
*
* For "trace_foo_bar()", you would need to create a wrapper function
* in a C file to call trace_foo_bar():
* void do_trace_foo_bar(args) { trace_foo_bar(args); }
* Then in the header file, declare the tracepoint:
* DECLARE_TRACEPOINT(foo_bar);
* And call your wrapper:
* static inline void some_inlined_function() {
* [..]
* if (tracepoint_enabled(foo_bar))
* do_trace_foo_bar(args);
* [..]
* }
*
* Note: tracepoint_enabled(foo_bar) is equivalent to trace_foo_bar_enabled()
* but is safe to have in headers, where trace_foo_bar_enabled() is not.
*/
#define DECLARE_TRACEPOINT(tp) \
extern struct tracepoint __tracepoint_##tp
#ifdef CONFIG_TRACEPOINTS
# define tracepoint_enabled(tp) \
static_key_false(&(__tracepoint_##tp).key)
#else
# define tracepoint_enabled(tracepoint) false
#endif
#endif

2
kernel/kprobes.c
View File

@ -2614,7 +2614,7 @@ static int __init init_kprobes(void)
init_test_probes();
return err;
}
subsys_initcall(init_kprobes);
early_initcall(init_kprobes);
#ifdef CONFIG_DEBUG_FS
static void report_probe(struct seq_file *pi, struct kprobe *p,

8
kernel/trace/fgraph.c
View File

@ -387,8 +387,8 @@ static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
}
}
read_lock(&tasklist_lock);
do_each_thread(g, t) {
rcu_read_lock();
for_each_process_thread(g, t) {
if (start == end) {
ret = -EAGAIN;
goto unlock;
@ -403,10 +403,10 @@ static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
smp_wmb();
t->ret_stack = ret_stack_list[start++];
}
} while_each_thread(g, t);
}
unlock:
read_unlock(&tasklist_lock);
rcu_read_unlock();
free:
for (i = start; i < end; i++)
kfree(ret_stack_list[i]);

24
kernel/trace/ftrace.c
View File

@ -230,7 +230,7 @@ static void update_ftrace_function(void)
/*
* For static tracing, we need to be a bit more careful.
* The function change takes affect immediately. Thus,
* we need to coorditate the setting of the function_trace_ops
* we need to coordinate the setting of the function_trace_ops
* with the setting of the ftrace_trace_function.
*
* Set the function to the list ops, which will call the
@ -1368,10 +1368,10 @@ static struct ftrace_hash *dup_hash(struct ftrace_hash *src, int size)
int i;
/*
* Make the hash size about 1/2 the # found
* Use around half the size (max bit of it), but
* a minimum of 2 is fine (as size of 0 or 1 both give 1 for bits).
*/
for (size /= 2; size; size >>= 1)
bits++;
bits = fls(size / 2);
/* Don't allocate too much */
if (bits > FTRACE_HASH_MAX_BITS)
@ -1451,7 +1451,7 @@ static bool hash_contains_ip(unsigned long ip,
{
/*
* The function record is a match if it exists in the filter
* hash and not in the notrace hash. Note, an emty hash is
* hash and not in the notrace hash. Note, an empty hash is
* considered a match for the filter hash, but an empty
* notrace hash is considered not in the notrace hash.
*/
@ -2402,7 +2402,7 @@ struct ftrace_ops direct_ops = {
*
* If the record has the FTRACE_FL_REGS set, that means that it
* wants to convert to a callback that saves all regs. If FTRACE_FL_REGS
* is not not set, then it wants to convert to the normal callback.
* is not set, then it wants to convert to the normal callback.
*
* Returns the address of the trampoline to set to
*/
@ -2976,7 +2976,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
synchronize_rcu_tasks_rude();
/*
* When the kernel is preeptive, tasks can be preempted
* When the kernel is preemptive, tasks can be preempted
* while on a ftrace trampoline. Just scheduling a task on
* a CPU is not good enough to flush them. Calling
* synchornize_rcu_tasks() will wait for those tasks to
@ -3129,18 +3129,20 @@ static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
static int ftrace_allocate_records(struct ftrace_page *pg, int count)
{
int order;
int pages;
int cnt;
if (WARN_ON(!count))
return -EINVAL;
order = get_count_order(DIV_ROUND_UP(count, ENTRIES_PER_PAGE));
pages = DIV_ROUND_UP(count, ENTRIES_PER_PAGE);
order = get_count_order(pages);
/*
* We want to fill as much as possible. No more than a page
* may be empty.
*/
while ((PAGE_SIZE << order) / ENTRY_SIZE >= count + ENTRIES_PER_PAGE)
if (!is_power_of_2(pages))
order--;
again:
@ -4368,7 +4370,7 @@ void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
* @ip: The instruction pointer address to map @data to
* @data: The data to map to @ip
*
* Returns 0 on succes otherwise an error.
* Returns 0 on success otherwise an error.
*/
int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
unsigned long ip, void *data)
@ -4536,7 +4538,7 @@ register_ftrace_function_probe(char *glob, struct trace_array *tr,
/*
* Note, there's a small window here that the func_hash->filter_hash
* may be NULL or empty. Need to be carefule when reading the loop.
* may be NULL or empty. Need to be careful when reading the loop.
*/
mutex_lock(&probe->ops.func_hash->regex_lock);

10
kernel/trace/ring_buffer.c
View File

@ -4866,6 +4866,9 @@ void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu)
if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
/* prevent another thread from changing buffer sizes */
mutex_lock(&buffer->mutex);
atomic_inc(&cpu_buffer->resize_disabled);
atomic_inc(&cpu_buffer->record_disabled);
@ -4876,6 +4879,8 @@ void ring_buffer_reset_cpu(struct trace_buffer *buffer, int cpu)
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&cpu_buffer->resize_disabled);
mutex_unlock(&buffer->mutex);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
@ -4889,6 +4894,9 @@ void ring_buffer_reset_online_cpus(struct trace_buffer *buffer)
struct ring_buffer_per_cpu *cpu_buffer;
int cpu;
/* prevent another thread from changing buffer sizes */
mutex_lock(&buffer->mutex);
for_each_online_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
@ -4907,6 +4915,8 @@ void ring_buffer_reset_online_cpus(struct trace_buffer *buffer)
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&cpu_buffer->resize_disabled);
}
mutex_unlock(&buffer->mutex);
}
/**

18
kernel/trace/synth_event_gen_test.c
View File

@ -242,9 +242,11 @@ static struct synth_field_desc create_synth_test_fields[] = {
{ .type = "pid_t", .name = "next_pid_field" },
{ .type = "char[16]", .name = "next_comm_field" },
{ .type = "u64", .name = "ts_ns" },
{ .type = "char[]", .name = "dynstring_field_1" },
{ .type = "u64", .name = "ts_ms" },
{ .type = "unsigned int", .name = "cpu" },
{ .type = "char[64]", .name = "my_string_field" },
{ .type = "char[]", .name = "dynstring_field_2" },
{ .type = "int", .name = "my_int_field" },
};
@ -254,7 +256,7 @@ static struct synth_field_desc create_synth_test_fields[] = {
*/
static int __init test_create_synth_event(void)
{
u64 vals[7];
u64 vals[9];
int ret;
/* Create the create_synth_test event with the fields above */
@ -292,10 +294,12 @@ static int __init test_create_synth_event(void)
vals[0] = 777; /* next_pid_field */
vals[1] = (u64)(long)"tiddlywinks"; /* next_comm_field */
vals[2] = 1000000; /* ts_ns */
vals[3] = 1000; /* ts_ms */
vals[4] = raw_smp_processor_id(); /* cpu */
vals[5] = (u64)(long)"thneed"; /* my_string_field */
vals[6] = 398; /* my_int_field */
vals[3] = (u64)(long)"xrayspecs"; /* dynstring_field_1 */
vals[4] = 1000; /* ts_ms */
vals[5] = raw_smp_processor_id(); /* cpu */
vals[6] = (u64)(long)"thneed"; /* my_string_field */
vals[7] = (u64)(long)"kerplunk"; /* dynstring_field_2 */
vals[8] = 398; /* my_int_field */
/* Now generate a create_synth_test event */
ret = synth_event_trace_array(create_synth_test, vals, ARRAY_SIZE(vals));
@ -422,13 +426,15 @@ static int __init test_trace_synth_event(void)
int ret;
/* Trace some bogus values just for testing */
ret = synth_event_trace(create_synth_test, 7, /* number of values */
ret = synth_event_trace(create_synth_test, 9, /* number of values */
(u64)444, /* next_pid_field */
(u64)(long)"clackers", /* next_comm_field */
(u64)1000000, /* ts_ns */
(u64)(long)"viewmaster",/* dynstring_field_1 */
(u64)1000, /* ts_ms */
(u64)raw_smp_processor_id(), /* cpu */
(u64)(long)"Thneed", /* my_string_field */
(u64)(long)"yoyos", /* dynstring_field_2 */
(u64)999); /* my_int_field */
return ret;
}

111
kernel/trace/trace.c
View File

@ -2650,7 +2650,7 @@ void trace_buffered_event_enable(void)
preempt_disable();
if (cpu == smp_processor_id() &&
this_cpu_read(trace_buffered_event) !=
__this_cpu_read(trace_buffered_event) !=
per_cpu(trace_buffered_event, cpu))
WARN_ON_ONCE(1);
preempt_enable();
@ -5142,10 +5142,10 @@ static const char readme_msg[] =
"\t -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
"\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"
"place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n"
"place (kretprobe): [<module>:]<symbol>[+<offset>]%return|<memaddr>\n"
#endif
#ifdef CONFIG_UPROBE_EVENTS
" place (uprobe): <path>:<offset>[(ref_ctr_offset)]\n"
" place (uprobe): <path>:<offset>[%return][(ref_ctr_offset)]\n"
#endif
"\t args: <name>=fetcharg[:type]\n"
"\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n"
@ -5269,7 +5269,12 @@ static const char readme_msg[] =
"\t trace(<synthetic_event>,param list) - generate synthetic event\n"
"\t save(field,...) - save current event fields\n"
#ifdef CONFIG_TRACER_SNAPSHOT
"\t snapshot() - snapshot the trace buffer\n"
"\t snapshot() - snapshot the trace buffer\n\n"
#endif
#ifdef CONFIG_SYNTH_EVENTS
" events/synthetic_events\t- Create/append/remove/show synthetic events\n"
"\t Write into this file to define/undefine new synthetic events.\n"
"\t example: echo 'myevent u64 lat; char name[]' >> synthetic_events\n"
#endif
#endif
;
@ -6682,7 +6687,6 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
written = -EFAULT;
} else
written = cnt;
len = cnt;
if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) {
/* do not add \n before testing triggers, but add \0 */
@ -8658,6 +8662,24 @@ struct trace_array *trace_array_find_get(const char *instance)
return tr;
}
static int trace_array_create_dir(struct trace_array *tr)
{
int ret;
tr->dir = tracefs_create_dir(tr->name, trace_instance_dir);
if (!tr->dir)
return -EINVAL;
ret = event_trace_add_tracer(tr->dir, tr);
if (ret)
tracefs_remove(tr->dir);
init_tracer_tracefs(tr, tr->dir);
__update_tracer_options(tr);
return ret;
}
static struct trace_array *trace_array_create(const char *name)
{
struct trace_array *tr;
@ -8693,30 +8715,28 @@ static struct trace_array *trace_array_create(const char *name)
if (allocate_trace_buffers(tr, trace_buf_size) < 0)
goto out_free_tr;
tr->dir = tracefs_create_dir(name, trace_instance_dir);
if (!tr->dir)
if (ftrace_allocate_ftrace_ops(tr) < 0)
goto out_free_tr;
ret = event_trace_add_tracer(tr->dir, tr);
if (ret) {
tracefs_remove(tr->dir);
goto out_free_tr;
}
ftrace_init_trace_array(tr);
init_tracer_tracefs(tr, tr->dir);
init_trace_flags_index(tr);
__update_tracer_options(tr);
if (trace_instance_dir) {
ret = trace_array_create_dir(tr);
if (ret)
goto out_free_tr;
} else
__trace_early_add_events(tr);
list_add(&tr->list, &ftrace_trace_arrays);
tr->ref++;
return tr;
out_free_tr:
ftrace_free_ftrace_ops(tr);
free_trace_buffers(tr);
free_cpumask_var(tr->tracing_cpumask);
kfree(tr->name);
@ -8821,7 +8841,6 @@ static int __remove_instance(struct trace_array *tr)
free_cpumask_var(tr->tracing_cpumask);
kfree(tr->name);
kfree(tr);
tr = NULL;
return 0;
}
@ -8875,11 +8894,27 @@ static int instance_rmdir(const char *name)
static __init void create_trace_instances(struct dentry *d_tracer)
{
struct trace_array *tr;
trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer,
instance_mkdir,
instance_rmdir);
if (MEM_FAIL(!trace_instance_dir, "Failed to create instances directory\n"))
return;
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
list_for_each_entry(tr, &ftrace_trace_arrays, list) {
if (!tr->name)
continue;
if (MEM_FAIL(trace_array_create_dir(tr) < 0,
"Failed to create instance directory\n"))
break;
}
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
}
static void
@ -8993,21 +9028,21 @@ static struct vfsmount *trace_automount(struct dentry *mntpt, void *ingore)
* directory. It is called via fs_initcall() by any of the boot up code
* and expects to return the dentry of the top level tracing directory.
*/
struct dentry *tracing_init_dentry(void)
int tracing_init_dentry(void)
{
struct trace_array *tr = &global_trace;
if (security_locked_down(LOCKDOWN_TRACEFS)) {
pr_warn("Tracing disabled due to lockdown\n");
return ERR_PTR(-EPERM);
return -EPERM;
}
/* The top level trace array uses NULL as parent */
if (tr->dir)
return NULL;
return 0;
if (WARN_ON(!tracefs_initialized()))
return ERR_PTR(-ENODEV);
return -ENODEV;
/*
* As there may still be users that expect the tracing
@ -9018,7 +9053,7 @@ struct dentry *tracing_init_dentry(void)
tr->dir = debugfs_create_automount("tracing", NULL,
trace_automount, NULL);
return NULL;
return 0;
}
extern struct trace_eval_map *__start_ftrace_eval_maps[];
@ -9105,48 +9140,48 @@ static struct notifier_block trace_module_nb = {
static __init int tracer_init_tracefs(void)
{
struct dentry *d_tracer;
int ret;
trace_access_lock_init();
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
event_trace_init();
init_tracer_tracefs(&global_trace, d_tracer);
ftrace_init_tracefs_toplevel(&global_trace, d_tracer);
init_tracer_tracefs(&global_trace, NULL);
ftrace_init_tracefs_toplevel(&global_trace, NULL);
trace_create_file("tracing_thresh", 0644, d_tracer,
trace_create_file("tracing_thresh", 0644, NULL,
&global_trace, &tracing_thresh_fops);
trace_create_file("README", 0444, d_tracer,
trace_create_file("README", 0444, NULL,
NULL, &tracing_readme_fops);
trace_create_file("saved_cmdlines", 0444, d_tracer,
trace_create_file("saved_cmdlines", 0444, NULL,
NULL, &tracing_saved_cmdlines_fops);
trace_create_file("saved_cmdlines_size", 0644, d_tracer,
trace_create_file("saved_cmdlines_size", 0644, NULL,
NULL, &tracing_saved_cmdlines_size_fops);
trace_create_file("saved_tgids", 0444, d_tracer,
trace_create_file("saved_tgids", 0444, NULL,
NULL, &tracing_saved_tgids_fops);
trace_eval_init();
trace_create_eval_file(d_tracer);
trace_create_eval_file(NULL);
#ifdef CONFIG_MODULES
register_module_notifier(&trace_module_nb);
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
trace_create_file("dyn_ftrace_total_info", 0444, NULL,
NULL, &tracing_dyn_info_fops);
#endif
create_trace_instances(d_tracer);
create_trace_instances(NULL);
update_tracer_options(&global_trace);
@ -9309,7 +9344,7 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
}
/*
* We need to stop all tracing on all CPUS to read the
* We need to stop all tracing on all CPUS to read
* the next buffer. This is a bit expensive, but is
* not done often. We fill all what we can read,
* and then release the locks again.
@ -9452,7 +9487,7 @@ __init static int tracer_alloc_buffers(void)
}
/*
* Make sure we don't accidently add more trace options
* Make sure we don't accidentally add more trace options
* than we have bits for.
*/
BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE);
@ -9481,7 +9516,7 @@ __init static int tracer_alloc_buffers(void)
/*
* The prepare callbacks allocates some memory for the ring buffer. We
* don't free the buffer if the if the CPU goes down. If we were to free
* don't free the buffer if the CPU goes down. If we were to free
* the buffer, then the user would lose any trace that was in the
* buffer. The memory will be removed once the "instance" is removed.
*/

31
kernel/trace/trace.h
View File

@ -19,6 +19,7 @@
#include <linux/glob.h>
#include <linux/irq_work.h>
#include <linux/workqueue.h>
#include <linux/ctype.h>
#ifdef CONFIG_FTRACE_SYSCALLS
#include <asm/unistd.h> /* For NR_SYSCALLS */
@ -246,7 +247,7 @@ typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
* tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
* passed in turn to the cond_snapshot.update() function. That data
* can be compared by the update() implementation with the cond_data
* contained wihin the struct cond_snapshot instance associated with
* contained within the struct cond_snapshot instance associated with
* the trace_array. Because the tr->max_lock is held throughout the
* update() call, the update() function can directly retrieve the
* cond_snapshot and cond_data associated with the per-instance
@ -271,7 +272,7 @@ typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
* take the snapshot, by returning 'true' if so, 'false' if no
* snapshot should be taken. Because the max_lock is held for
* the duration of update(), the implementation is safe to
* directly retrieven and save any implementation data it needs
* directly retrieved and save any implementation data it needs
* to in association with the snapshot.
*/
struct cond_snapshot {
@ -573,7 +574,7 @@ struct tracer {
* The function callback, which can use the FTRACE bits to
* check for recursion.
*
* Now if the arch does not suppport a feature, and it calls
* Now if the arch does not support a feature, and it calls
* the global list function which calls the ftrace callback
* all three of these steps will do a recursion protection.
* There's no reason to do one if the previous caller already
@ -737,7 +738,7 @@ struct dentry *trace_create_file(const char *name,
void *data,
const struct file_operations *fops);
struct dentry *tracing_init_dentry(void);
int tracing_init_dentry(void);
struct ring_buffer_event;
@ -1125,6 +1126,8 @@ extern int ftrace_is_dead(void);
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent);
void ftrace_destroy_function_files(struct trace_array *tr);
int ftrace_allocate_ftrace_ops(struct trace_array *tr);
void ftrace_free_ftrace_ops(struct trace_array *tr);
void ftrace_init_global_array_ops(struct trace_array *tr);
void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
void ftrace_reset_array_ops(struct trace_array *tr);
@ -1146,6 +1149,11 @@ ftrace_create_function_files(struct trace_array *tr,
{
return 0;
}
static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
{
return 0;
}
static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
static inline __init void
ftrace_init_global_array_ops(struct trace_array *tr) { }
@ -1472,7 +1480,7 @@ __trace_event_discard_commit(struct trace_buffer *buffer,
/*
* Helper function for event_trigger_unlock_commit{_regs}().
* If there are event triggers attached to this event that requires
* filtering against its fields, then they wil be called as the
* filtering against its fields, then they will be called as the
* entry already holds the field information of the current event.
*
* It also checks if the event should be discarded or not.
@ -1651,6 +1659,7 @@ extern void trace_event_enable_tgid_record(bool enable);
extern int event_trace_init(void);
extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
extern int event_trace_del_tracer(struct trace_array *tr);
extern void __trace_early_add_events(struct trace_array *tr);
extern struct trace_event_file *__find_event_file(struct trace_array *tr,
const char *system,
@ -2082,4 +2091,16 @@ static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
iter->pos = -1;
}
/* Check the name is good for event/group/fields */
static inline bool is_good_name(const char *name)
{
if (!isalpha(*name) && *name != '_')
return false;
while (*++name != '\0') {
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
return false;
}
return true;
}
#endif /* _LINUX_KERNEL_TRACE_H */

23
kernel/trace/trace_boot.c
View File

@ -40,6 +40,16 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
pr_err("Failed to set option: %s\n", buf);
}
p = xbc_node_find_value(node, "tracing_on", NULL);
if (p && *p != '\0') {
if (kstrtoul(p, 10, &v))
pr_err("Failed to set tracing on: %s\n", p);
if (v)
tracer_tracing_on(tr);
else
tracer_tracing_off(tr);
}
p = xbc_node_find_value(node, "trace_clock", NULL);
if (p && *p != '\0') {
if (tracing_set_clock(tr, p) < 0)
@ -274,6 +284,12 @@ trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node)
if (tracing_set_tracer(tr, p) < 0)
pr_err("Failed to set given tracer: %s\n", p);
}
/* Since tracer can free snapshot buffer, allocate snapshot here.*/
if (xbc_node_find_value(node, "alloc_snapshot", NULL)) {
if (tracing_alloc_snapshot_instance(tr) < 0)
pr_err("Failed to allocate snapshot buffer\n");
}
}
static void __init
@ -330,5 +346,8 @@ static int __init trace_boot_init(void)
return 0;
}
fs_initcall(trace_boot_init);
/*
* Start tracing at the end of core-initcall, so that it starts tracing
* from the beginning of postcore_initcall.
*/
core_initcall_sync(trace_boot_init);

10
kernel/trace/trace_dynevent.c
View File

@ -206,14 +206,14 @@ static const struct file_operations dynamic_events_ops = {
/* Make a tracefs interface for controlling dynamic events */
static __init int init_dynamic_event(void)
{
struct dentry *d_tracer;
struct dentry *entry;
int ret;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
entry = tracefs_create_file("dynamic_events", 0644, d_tracer,
entry = tracefs_create_file("dynamic_events", 0644, NULL,
NULL, &dynamic_events_ops);
/* Event list interface */
@ -402,7 +402,7 @@ void dynevent_arg_init(struct dynevent_arg *arg,
* whitespace, all followed by a separator, if applicable. After the
* first arg string is successfully appended to the command string,
* the optional @operator is appended, followed by the second arg and
* and optional @separator. If no separator was specified when
* optional @separator. If no separator was specified when
* initializing the arg, a space will be appended.
*/
void dynevent_arg_pair_init(struct dynevent_arg_pair *arg_pair,

140
kernel/trace/trace_events.c
View File

@ -38,6 +38,7 @@ DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);
static LIST_HEAD(ftrace_generic_fields);
static LIST_HEAD(ftrace_common_fields);
static bool eventdir_initialized;
#define GFP_TRACE (GFP_KERNEL | __GFP_ZERO)
@ -2123,12 +2124,48 @@ event_subsystem_dir(struct trace_array *tr, const char *name,
return NULL;
}
static int
event_define_fields(struct trace_event_call *call)
{
struct list_head *head;
int ret = 0;
/*
* Other events may have the same class. Only update
* the fields if they are not already defined.
*/
head = trace_get_fields(call);
if (list_empty(head)) {
struct trace_event_fields *field = call->class->fields_array;
unsigned int offset = sizeof(struct trace_entry);
for (; field->type; field++) {
if (field->type == TRACE_FUNCTION_TYPE) {
field->define_fields(call);
break;
}
offset = ALIGN(offset, field->align);
ret = trace_define_field(call, field->type, field->name,
offset, field->size,
field->is_signed, field->filter_type);
if (WARN_ON_ONCE(ret)) {
pr_err("error code is %d\n", ret);
break;
}
offset += field->size;
}
}
return ret;
}
static int
event_create_dir(struct dentry *parent, struct trace_event_file *file)
{
struct trace_event_call *call = file->event_call;
struct trace_array *tr = file->tr;
struct list_head *head;
struct dentry *d_events;
const char *name;
int ret;
@ -2162,35 +2199,10 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file)
&ftrace_event_id_fops);
#endif
/*
* Other events may have the same class. Only update
* the fields if they are not already defined.
*/
head = trace_get_fields(call);
if (list_empty(head)) {
struct trace_event_fields *field = call->class->fields_array;
unsigned int offset = sizeof(struct trace_entry);
for (; field->type; field++) {
if (field->type == TRACE_FUNCTION_TYPE) {
ret = field->define_fields(call);
break;
}
offset = ALIGN(offset, field->align);
ret = trace_define_field(call, field->type, field->name,
offset, field->size,
field->is_signed, field->filter_type);
if (ret)
break;
offset += field->size;
}
if (ret < 0) {
pr_warn("Could not initialize trace point events/%s\n",
name);
return -1;
}
ret = event_define_fields(call);
if (ret < 0) {
pr_warn("Could not initialize trace point events/%s\n", name);
return ret;
}
/*
@ -2475,7 +2487,10 @@ __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr)
if (!file)
return -ENOMEM;
return event_create_dir(tr->event_dir, file);
if (eventdir_initialized)
return event_create_dir(tr->event_dir, file);
else
return event_define_fields(call);
}
/*
@ -2493,7 +2508,7 @@ __trace_early_add_new_event(struct trace_event_call *call,
if (!file)
return -ENOMEM;
return 0;
return event_define_fields(call);
}
struct ftrace_module_file_ops;
@ -3116,14 +3131,13 @@ static inline int register_event_cmds(void) { return 0; }
#endif /* CONFIG_DYNAMIC_FTRACE */
/*
* The top level array has already had its trace_event_file
* descriptors created in order to allow for early events to
* be recorded. This function is called after the tracefs has been
* initialized, and we now have to create the files associated
* to the events.
* The top level array and trace arrays created by boot-time tracing
* have already had its trace_event_file descriptors created in order
* to allow for early events to be recorded.
* This function is called after the tracefs has been initialized,
* and we now have to create the files associated to the events.
*/
static __init void
__trace_early_add_event_dirs(struct trace_array *tr)
static void __trace_early_add_event_dirs(struct trace_array *tr)
{
struct trace_event_file *file;
int ret;
@ -3138,13 +3152,12 @@ __trace_early_add_event_dirs(struct trace_array *tr)
}
/*
* For early boot up, the top trace array requires to have
* a list of events that can be enabled. This must be done before
* the filesystem is set up in order to allow events to be traced
* early.
* For early boot up, the top trace array and the trace arrays created
* by boot-time tracing require to have a list of events that can be
* enabled. This must be done before the filesystem is set up in order
* to allow events to be traced early.
*/
static __init void
__trace_early_add_events(struct trace_array *tr)
void __trace_early_add_events(struct trace_array *tr)
{
struct trace_event_call *call;
int ret;
@ -3275,7 +3288,11 @@ int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr)
goto out;
down_write(&trace_event_sem);
__trace_add_event_dirs(tr);
/* If tr already has the event list, it is initialized in early boot. */
if (unlikely(!list_empty(&tr->events)))
__trace_early_add_event_dirs(tr);
else
__trace_add_event_dirs(tr);
up_write(&trace_event_sem);
out:
@ -3431,10 +3448,21 @@ static __init int event_trace_enable_again(void)
early_initcall(event_trace_enable_again);
/* Init fields which doesn't related to the tracefs */
static __init int event_trace_init_fields(void)
{
if (trace_define_generic_fields())
pr_warn("tracing: Failed to allocated generic fields");
if (trace_define_common_fields())
pr_warn("tracing: Failed to allocate common fields");
return 0;
}
__init int event_trace_init(void)
{
struct trace_array *tr;
struct dentry *d_tracer;
struct dentry *entry;
int ret;
@ -3442,22 +3470,12 @@ __init int event_trace_init(void)
if (!tr)
return -ENODEV;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
return 0;
entry = tracefs_create_file("available_events", 0444, d_tracer,
entry = tracefs_create_file("available_events", 0444, NULL,
tr, &ftrace_avail_fops);
if (!entry)
pr_warn("Could not create tracefs 'available_events' entry\n");
if (trace_define_generic_fields())
pr_warn("tracing: Failed to allocated generic fields");
if (trace_define_common_fields())
pr_warn("tracing: Failed to allocate common fields");
ret = early_event_add_tracer(d_tracer, tr);
ret = early_event_add_tracer(NULL, tr);
if (ret)
return ret;
@ -3466,6 +3484,9 @@ __init int event_trace_init(void)
if (ret)
pr_warn("Failed to register trace events module notifier\n");
#endif
eventdir_initialized = true;
return 0;
}
@ -3474,6 +3495,7 @@ void __init trace_event_init(void)
event_trace_memsetup();
init_ftrace_syscalls();
event_trace_enable();
event_trace_init_fields();
}
#ifdef CONFIG_EVENT_TRACE_STARTUP_TEST

45
kernel/trace/trace_events_hist.c
View File

@ -147,6 +147,8 @@ struct hist_field {
*/
unsigned int var_ref_idx;
bool read_once;
unsigned int var_str_idx;
};
static u64 hist_field_none(struct hist_field *field,
@ -349,6 +351,7 @@ struct hist_trigger_data {
unsigned int n_keys;
unsigned int n_fields;
unsigned int n_vars;
unsigned int n_var_str;
unsigned int key_size;
struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
unsigned int n_sort_keys;
@ -1396,7 +1399,14 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
}
}
n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
n_str = hist_data->n_field_var_str + hist_data->n_save_var_str +
hist_data->n_var_str;
if (n_str > SYNTH_FIELDS_MAX) {
hist_elt_data_free(elt_data);
return -EINVAL;
}
BUILD_BUG_ON(STR_VAR_LEN_MAX & (sizeof(u64) - 1));
size = STR_VAR_LEN_MAX;
@ -3279,6 +3289,15 @@ static int check_synth_field(struct synth_event *event,
field = event->fields[field_pos];
/*
* A dynamic string synth field can accept static or
* dynamic. A static string synth field can only accept a
* same-sized static string, which is checked for later.
*/
if (strstr(hist_field->type, "char[") && field->is_string
&& field->is_dynamic)
return 0;
if (strcmp(field->type, hist_field->type) != 0) {
if (field->size != hist_field->size ||
field->is_signed != hist_field->is_signed)
@ -3651,6 +3670,7 @@ static int create_var_field(struct hist_trigger_data *hist_data,
{
struct trace_array *tr = hist_data->event_file->tr;
unsigned long flags = 0;
int ret;
if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
return -EINVAL;
@ -3665,7 +3685,12 @@ static int create_var_field(struct hist_trigger_data *hist_data,
if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX))
return -EINVAL;
return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
ret = __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags);
if (!ret && hist_data->fields[val_idx]->flags & HIST_FIELD_FL_STRING)
hist_data->fields[val_idx]->var_str_idx = hist_data->n_var_str++;
return ret;
}
static int create_val_fields(struct hist_trigger_data *hist_data,
@ -4392,6 +4417,22 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
hist_val = hist_field->fn(hist_field, elt, rbe, rec);
if (hist_field->flags & HIST_FIELD_FL_VAR) {
var_idx = hist_field->var.idx;
if (hist_field->flags & HIST_FIELD_FL_STRING) {
unsigned int str_start, var_str_idx, idx;
char *str, *val_str;
str_start = hist_data->n_field_var_str +
hist_data->n_save_var_str;
var_str_idx = hist_field->var_str_idx;
idx = str_start + var_str_idx;
str = elt_data->field_var_str[idx];
val_str = (char *)(uintptr_t)hist_val;
strscpy(str, val_str, STR_VAR_LEN_MAX);
hist_val = (u64)(uintptr_t)str;
}
tracing_map_set_var(elt, var_idx, hist_val);
continue;
}

413
kernel/trace/trace_events_synth.c
View File

@ -20,6 +20,48 @@
#include "trace_synth.h"
#undef ERRORS
#define ERRORS \
C(BAD_NAME, "Illegal name"), \
C(CMD_INCOMPLETE, "Incomplete command"), \
C(EVENT_EXISTS, "Event already exists"), \
C(TOO_MANY_FIELDS, "Too many fields"), \
C(INCOMPLETE_TYPE, "Incomplete type"), \
C(INVALID_TYPE, "Invalid type"), \
C(INVALID_FIELD, "Invalid field"), \
C(CMD_TOO_LONG, "Command too long"),
#undef C
#define C(a, b) SYNTH_ERR_##a
enum { ERRORS };
#undef C
#define C(a, b) b
static const char *err_text[] = { ERRORS };
static char last_cmd[MAX_FILTER_STR_VAL];
static int errpos(const char *str)
{
return err_pos(last_cmd, str);
}
static void last_cmd_set(char *str)
{
if (!str)
return;
strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
}
static void synth_err(u8 err_type, u8 err_pos)
{
tracing_log_err(NULL, "synthetic_events", last_cmd, err_text,
err_type, err_pos);
}
static int create_synth_event(int argc, const char **argv);
static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
static int synth_event_release(struct dyn_event *ev);
@ -88,7 +130,7 @@ static int synth_event_define_fields(struct trace_event_call *call)
event->fields[i]->offset = n_u64;
if (event->fields[i]->is_string) {
if (event->fields[i]->is_string && !event->fields[i]->is_dynamic) {
offset += STR_VAR_LEN_MAX;
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
} else {
@ -132,13 +174,16 @@ static int synth_field_string_size(char *type)
start += sizeof("char[") - 1;
end = strchr(type, ']');
if (!end || end < start)
if (!end || end < start || type + strlen(type) > end + 1)
return -EINVAL;
len = end - start;
if (len > 3)
return -EINVAL;
if (len == 0)
return 0; /* variable-length string */
strncpy(buf, start, len);
buf[len] = '\0';
@ -184,6 +229,8 @@ static int synth_field_size(char *type)
size = sizeof(long);
else if (strcmp(type, "unsigned long") == 0)
size = sizeof(unsigned long);
else if (strcmp(type, "bool") == 0)
size = sizeof(bool);
else if (strcmp(type, "pid_t") == 0)
size = sizeof(pid_t);
else if (strcmp(type, "gfp_t") == 0)
@ -226,12 +273,14 @@ static const char *synth_field_fmt(char *type)
fmt = "%ld";
else if (strcmp(type, "unsigned long") == 0)
fmt = "%lu";
else if (strcmp(type, "bool") == 0)
fmt = "%d";
else if (strcmp(type, "pid_t") == 0)
fmt = "%d";
else if (strcmp(type, "gfp_t") == 0)
fmt = "%x";
else if (synth_field_is_string(type))
fmt = "%s";
fmt = "%.*s";
return fmt;
}
@ -290,10 +339,27 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter,
/* parameter values */
if (se->fields[i]->is_string) {
trace_seq_printf(s, print_fmt, se->fields[i]->name,
(char *)&entry->fields[n_u64],
i == se->n_fields - 1 ? "" : " ");
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
if (se->fields[i]->is_dynamic) {
u32 offset, data_offset;
char *str_field;
offset = (u32)entry->fields[n_u64];
data_offset = offset & 0xffff;
str_field = (char *)entry + data_offset;
trace_seq_printf(s, print_fmt, se->fields[i]->name,
STR_VAR_LEN_MAX,
str_field,
i == se->n_fields - 1 ? "" : " ");
n_u64++;
} else {
trace_seq_printf(s, print_fmt, se->fields[i]->name,
STR_VAR_LEN_MAX,
(char *)&entry->fields[n_u64],
i == se->n_fields - 1 ? "" : " ");
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
}
} else {
struct trace_print_flags __flags[] = {
__def_gfpflag_names, {-1, NULL} };
@ -325,16 +391,52 @@ static struct trace_event_functions synth_event_funcs = {
.trace = print_synth_event
};
static unsigned int trace_string(struct synth_trace_event *entry,
struct synth_event *event,
char *str_val,
bool is_dynamic,
unsigned int data_size,
unsigned int *n_u64)
{
unsigned int len = 0;
char *str_field;
if (is_dynamic) {
u32 data_offset;
data_offset = offsetof(typeof(*entry), fields);
data_offset += event->n_u64 * sizeof(u64);
data_offset += data_size;
str_field = (char *)entry + data_offset;
len = strlen(str_val) + 1;
strscpy(str_field, str_val, len);
data_offset |= len << 16;
*(u32 *)&entry->fields[*n_u64] = data_offset;
(*n_u64)++;
} else {
str_field = (char *)&entry->fields[*n_u64];
strscpy(str_field, str_val, STR_VAR_LEN_MAX);
(*n_u64) += STR_VAR_LEN_MAX / sizeof(u64);
}
return len;
}
static notrace void trace_event_raw_event_synth(void *__data,
u64 *var_ref_vals,
unsigned int *var_ref_idx)
{
unsigned int i, n_u64, val_idx, len, data_size = 0;
struct trace_event_file *trace_file = __data;
struct synth_trace_event *entry;
struct trace_event_buffer fbuffer;
struct trace_buffer *buffer;
struct synth_event *event;
unsigned int i, n_u64, val_idx;
int fields_size = 0;
event = trace_file->event_call->data;
@ -344,6 +446,18 @@ static notrace void trace_event_raw_event_synth(void *__data,
fields_size = event->n_u64 * sizeof(u64);
for (i = 0; i < event->n_dynamic_fields; i++) {
unsigned int field_pos = event->dynamic_fields[i]->field_pos;
char *str_val;
val_idx = var_ref_idx[field_pos];
str_val = (char *)(long)var_ref_vals[val_idx];
len = strlen(str_val) + 1;
fields_size += len;
}
/*
* Avoid ring buffer recursion detection, as this event
* is being performed within another event.
@ -360,10 +474,11 @@ static notrace void trace_event_raw_event_synth(void *__data,
val_idx = var_ref_idx[i];
if (event->fields[i]->is_string) {
char *str_val = (char *)(long)var_ref_vals[val_idx];
char *str_field = (char *)&entry->fields[n_u64];
strscpy(str_field, str_val, STR_VAR_LEN_MAX);
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
len = trace_string(entry, event, str_val,
event->fields[i]->is_dynamic,
data_size, &n_u64);
data_size += len; /* only dynamic string increments */
} else {
struct synth_field *field = event->fields[i];
u64 val = var_ref_vals[val_idx];
@ -422,8 +537,13 @@ static int __set_synth_event_print_fmt(struct synth_event *event,
pos += snprintf(buf + pos, LEN_OR_ZERO, "\"");
for (i = 0; i < event->n_fields; i++) {
pos += snprintf(buf + pos, LEN_OR_ZERO,
", REC->%s", event->fields[i]->name);
if (event->fields[i]->is_string &&
event->fields[i]->is_dynamic)
pos += snprintf(buf + pos, LEN_OR_ZERO,
", __get_str(%s)", event->fields[i]->name);
else
pos += snprintf(buf + pos, LEN_OR_ZERO,
", REC->%s", event->fields[i]->name);
}
#undef LEN_OR_ZERO
@ -465,13 +585,16 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
struct synth_field *field;
const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
int len, ret = 0;
ssize_t size;
if (field_type[0] == ';')
field_type++;
if (!strcmp(field_type, "unsigned")) {
if (argc < 3)
if (argc < 3) {
synth_err(SYNTH_ERR_INCOMPLETE_TYPE, errpos(field_type));
return ERR_PTR(-EINVAL);
}
prefix = "unsigned ";
field_type = argv[1];
field_name = argv[2];
@ -497,12 +620,23 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
ret = -ENOMEM;
goto free;
}
if (!is_good_name(field->name)) {
synth_err(SYNTH_ERR_BAD_NAME, errpos(field_name));
ret = -EINVAL;
goto free;
}
if (field_type[0] == ';')
field_type++;
len = strlen(field_type) + 1;
if (array)
len += strlen(array);
if (array) {
int l = strlen(array);
if (l && array[l - 1] == ';')
l--;
len += l;
}
if (prefix)
len += strlen(prefix);
@ -520,17 +654,40 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
field->type[len - 1] = '\0';
}
field->size = synth_field_size(field->type);
if (!field->size) {
size = synth_field_size(field->type);
if (size < 0) {
synth_err(SYNTH_ERR_INVALID_TYPE, errpos(field_type));
ret = -EINVAL;
goto free;
} else if (size == 0) {
if (synth_field_is_string(field->type)) {
char *type;
type = kzalloc(sizeof("__data_loc ") + strlen(field->type) + 1, GFP_KERNEL);
if (!type) {
ret = -ENOMEM;
goto free;
}
strcat(type, "__data_loc ");
strcat(type, field->type);
kfree(field->type);
field->type = type;
field->is_dynamic = true;
size = sizeof(u64);
} else {
synth_err(SYNTH_ERR_INVALID_TYPE, errpos(field_type));
ret = -EINVAL;
goto free;
}
}
field->size = size;
if (synth_field_is_string(field->type))
field->is_string = true;
field->is_signed = synth_field_signed(field->type);
out:
return field;
free:
@ -661,6 +818,7 @@ static void free_synth_event(struct synth_event *event)
free_synth_field(event->fields[i]);
kfree(event->fields);
kfree(event->dynamic_fields);
kfree(event->name);
kfree(event->class.system);
free_synth_tracepoint(event->tp);
@ -671,8 +829,8 @@ static void free_synth_event(struct synth_event *event)
static struct synth_event *alloc_synth_event(const char *name, int n_fields,
struct synth_field **fields)
{
unsigned int i, j, n_dynamic_fields = 0;
struct synth_event *event;
unsigned int i;
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event) {
@ -694,11 +852,33 @@ static struct synth_event *alloc_synth_event(const char *name, int n_fields,
goto out;
}
for (i = 0; i < n_fields; i++)
if (fields[i]->is_dynamic)
n_dynamic_fields++;
if (n_dynamic_fields) {
event->dynamic_fields = kcalloc(n_dynamic_fields,
sizeof(*event->dynamic_fields),
GFP_KERNEL);
if (!event->dynamic_fields) {
free_synth_event(event);
event = ERR_PTR(-ENOMEM);
goto out;
}
}
dyn_event_init(&event->devent, &synth_event_ops);
for (i = 0; i < n_fields; i++)
for (i = 0, j = 0; i < n_fields; i++) {
event->fields[i] = fields[i];
if (fields[i]->is_dynamic) {
event->dynamic_fields[j] = fields[i];
event->dynamic_fields[j]->field_pos = i;
event->dynamic_fields[j++] = fields[i];
event->n_dynamic_fields++;
}
}
event->n_fields = n_fields;
out:
return event;
@ -710,6 +890,10 @@ static int synth_event_check_arg_fn(void *data)
int size;
size = synth_field_size((char *)arg_pair->lhs);
if (size == 0) {
if (strstr((char *)arg_pair->lhs, "["))
return 0;
}
return size ? 0 : -EINVAL;
}
@ -971,12 +1155,47 @@ int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd, const char *name,
}
EXPORT_SYMBOL_GPL(synth_event_gen_cmd_array_start);
static int save_cmdstr(int argc, const char *name, const char **argv)
{
struct seq_buf s;
char *buf;
int i;
buf = kzalloc(MAX_DYNEVENT_CMD_LEN, GFP_KERNEL);
if (!buf)
return -ENOMEM;
seq_buf_init(&s, buf, MAX_DYNEVENT_CMD_LEN);
seq_buf_puts(&s, name);
for (i = 0; i < argc; i++) {
seq_buf_putc(&s, ' ');
seq_buf_puts(&s, argv[i]);
}
if (!seq_buf_buffer_left(&s)) {
synth_err(SYNTH_ERR_CMD_TOO_LONG, 0);
kfree(buf);
return -EINVAL;
}
buf[s.len] = 0;
last_cmd_set(buf);
kfree(buf);
return 0;
}
static int __create_synth_event(int argc, const char *name, const char **argv)
{
struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
struct synth_event *event = NULL;
int i, consumed = 0, n_fields = 0, ret = 0;
ret = save_cmdstr(argc, name, argv);
if (ret)
return ret;
/*
* Argument syntax:
* - Add synthetic event: <event_name> field[;field] ...
@ -984,13 +1203,22 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
* where 'field' = type field_name
*/
if (name[0] == '\0' || argc < 1)
if (name[0] == '\0' || argc < 1) {
synth_err(SYNTH_ERR_CMD_INCOMPLETE, 0);
return -EINVAL;
}
mutex_lock(&event_mutex);
if (!is_good_name(name)) {
synth_err(SYNTH_ERR_BAD_NAME, errpos(name));
ret = -EINVAL;
goto out;
}
event = find_synth_event(name);
if (event) {
synth_err(SYNTH_ERR_EVENT_EXISTS, errpos(name));
ret = -EEXIST;
goto out;
}
@ -999,6 +1227,7 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
if (strcmp(argv[i], ";") == 0)
continue;
if (n_fields == SYNTH_FIELDS_MAX) {
synth_err(SYNTH_ERR_TOO_MANY_FIELDS, 0);
ret = -EINVAL;
goto err;
}
@ -1013,6 +1242,7 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
}
if (i < argc && strcmp(argv[i], ";") != 0) {
synth_err(SYNTH_ERR_INVALID_FIELD, errpos(argv[i]));
ret = -EINVAL;
goto err;
}
@ -1198,10 +1428,9 @@ void synth_event_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen)
EXPORT_SYMBOL_GPL(synth_event_cmd_init);
static inline int
__synth_event_trace_start(struct trace_event_file *file,
struct synth_event_trace_state *trace_state)
__synth_event_trace_init(struct trace_event_file *file,
struct synth_event_trace_state *trace_state)
{
int entry_size, fields_size = 0;
int ret = 0;
memset(trace_state, '\0', sizeof(*trace_state));
@ -1211,7 +1440,7 @@ __synth_event_trace_start(struct trace_event_file *file,
* ENABLED bit is set (which attaches the probe thus allowing
* this code to be called, etc). Because this is called
* directly by the user, we don't have that but we still need
* to honor not logging when disabled. For the the iterated
* to honor not logging when disabled. For the iterated
* trace case, we save the enabed state upon start and just
* ignore the following data calls.
*/
@ -1223,8 +1452,20 @@ __synth_event_trace_start(struct trace_event_file *file,
}
trace_state->event = file->event_call->data;
out:
return ret;
}
static inline int
__synth_event_trace_start(struct trace_event_file *file,
struct synth_event_trace_state *trace_state,
int dynamic_fields_size)
{
int entry_size, fields_size = 0;
int ret = 0;
fields_size = trace_state->event->n_u64 * sizeof(u64);
fields_size += dynamic_fields_size;
/*
* Avoid ring buffer recursion detection, as this event
@ -1241,7 +1482,7 @@ __synth_event_trace_start(struct trace_event_file *file,
ring_buffer_nest_end(trace_state->buffer);
ret = -EINVAL;
}
out:
return ret;
}
@ -1274,23 +1515,46 @@ __synth_event_trace_end(struct synth_event_trace_state *trace_state)
*/
int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
{
unsigned int i, n_u64, len, data_size = 0;
struct synth_event_trace_state state;
unsigned int i, n_u64;
va_list args;
int ret;
ret = __synth_event_trace_start(file, &state);
ret = __synth_event_trace_init(file, &state);
if (ret) {
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
return ret;
}
if (state.event->n_dynamic_fields) {
va_start(args, n_vals);
for (i = 0; i < state.event->n_fields; i++) {
u64 val = va_arg(args, u64);
if (state.event->fields[i]->is_string &&
state.event->fields[i]->is_dynamic) {
char *str_val = (char *)(long)val;
data_size += strlen(str_val) + 1;
}
}
va_end(args);
}
ret = __synth_event_trace_start(file, &state, data_size);
if (ret)
return ret;
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
goto out;
}
data_size = 0;
va_start(args, n_vals);
for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) {
u64 val;
@ -1299,10 +1563,11 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
if (state.event->fields[i]->is_string) {
char *str_val = (char *)(long)val;
char *str_field = (char *)&state.entry->fields[n_u64];
strscpy(str_field, str_val, STR_VAR_LEN_MAX);
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
len = trace_string(state.entry, state.event, str_val,
state.event->fields[i]->is_dynamic,
data_size, &n_u64);
data_size += len; /* only dynamic string increments */
} else {
struct synth_field *field = state.event->fields[i];
@ -1355,29 +1620,46 @@ EXPORT_SYMBOL_GPL(synth_event_trace);
int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
unsigned int n_vals)
{
unsigned int i, n_u64, field_pos, len, data_size = 0;
struct synth_event_trace_state state;
unsigned int i, n_u64;
char *str_val;
int ret;
ret = __synth_event_trace_start(file, &state);
ret = __synth_event_trace_init(file, &state);
if (ret) {
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
return ret;
}
if (state.event->n_dynamic_fields) {
for (i = 0; i < state.event->n_dynamic_fields; i++) {
field_pos = state.event->dynamic_fields[i]->field_pos;
str_val = (char *)(long)vals[field_pos];
len = strlen(str_val) + 1;
data_size += len;
}
}
ret = __synth_event_trace_start(file, &state, data_size);
if (ret)
return ret;
if (n_vals != state.event->n_fields) {
ret = -EINVAL;
goto out;
}
data_size = 0;
for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) {
if (state.event->fields[i]->is_string) {
char *str_val = (char *)(long)vals[i];
char *str_field = (char *)&state.entry->fields[n_u64];
strscpy(str_field, str_val, STR_VAR_LEN_MAX);
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
len = trace_string(state.entry, state.event, str_val,
state.event->fields[i]->is_dynamic,
data_size, &n_u64);
data_size += len; /* only dynamic string increments */
} else {
struct synth_field *field = state.event->fields[i];
u64 val = vals[i];
@ -1445,9 +1727,17 @@ int synth_event_trace_start(struct trace_event_file *file,
if (!trace_state)
return -EINVAL;
ret = __synth_event_trace_start(file, trace_state);
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
ret = __synth_event_trace_init(file, trace_state);
if (ret) {
if (ret == -ENOENT)
ret = 0; /* just disabled, not really an error */
return ret;
}
if (trace_state->event->n_dynamic_fields)
return -ENOTSUPP;
ret = __synth_event_trace_start(file, trace_state, 0);
return ret;
}
@ -1508,6 +1798,11 @@ static int __synth_event_add_val(const char *field_name, u64 val,
char *str_val = (char *)(long)val;
char *str_field;
if (field->is_dynamic) { /* add_val can't do dynamic strings */
ret = -EINVAL;
goto out;
}
if (!str_val) {
ret = -EINVAL;
goto out;
@ -1679,14 +1974,22 @@ static int __synth_event_show(struct seq_file *m, struct synth_event *event)
{
struct synth_field *field;
unsigned int i;
char *type, *t;
seq_printf(m, "%s\t", event->name);
for (i = 0; i < event->n_fields; i++) {
field = event->fields[i];
type = field->type;
t = strstr(type, "__data_loc");
if (t) { /* __data_loc belongs in format but not event desc */
t += sizeof("__data_loc");
type = t;
}
/* parameter values */
seq_printf(m, "%s %s%s", field->type, field->name,
seq_printf(m, "%s %s%s", type, field->name,
i == event->n_fields - 1 ? "" : "; ");
}
@ -1754,25 +2057,31 @@ static const struct file_operations synth_events_fops = {
.release = seq_release,
};
static __init int trace_events_synth_init(void)
/*
* Register dynevent at core_initcall. This allows kernel to setup kprobe
* events in postcore_initcall without tracefs.
*/
static __init int trace_events_synth_init_early(void)
{
struct dentry *entry = NULL;
struct dentry *d_tracer;
int err = 0;
err = dyn_event_register(&synth_event_ops);
if (err) {
if (err)
pr_warn("Could not register synth_event_ops\n");
return err;
}
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer)) {
err = PTR_ERR(d_tracer);
return err;
}
core_initcall(trace_events_synth_init_early);
static __init int trace_events_synth_init(void)
{
struct dentry *entry = NULL;
int err = 0;
err = tracing_init_dentry();
if (err)
goto err;
}
entry = tracefs_create_file("synthetic_events", 0644, d_tracer,
entry = tracefs_create_file("synthetic_events", 0644, NULL,
NULL, &synth_events_fops);
if (!entry) {
err = -ENODEV;

22
kernel/trace/trace_functions.c
View File

@ -34,10 +34,14 @@ enum {
TRACE_FUNC_OPT_STACK = 0x1,
};
static int allocate_ftrace_ops(struct trace_array *tr)
int ftrace_allocate_ftrace_ops(struct trace_array *tr)
{
struct ftrace_ops *ops;
/* The top level array uses the "global_ops" */
if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
return 0;
ops = kzalloc(sizeof(*ops), GFP_KERNEL);
if (!ops)
return -ENOMEM;
@ -48,15 +52,19 @@ static int allocate_ftrace_ops(struct trace_array *tr)
tr->ops = ops;
ops->private = tr;
return 0;
}
void ftrace_free_ftrace_ops(struct trace_array *tr)
{
kfree(tr->ops);
tr->ops = NULL;
}
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent)
{
int ret;
/*
* The top level array uses the "global_ops", and the files are
* created on boot up.
@ -64,9 +72,8 @@ int ftrace_create_function_files(struct trace_array *tr,
if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
return 0;
ret = allocate_ftrace_ops(tr);
if (ret)
return ret;
if (!tr->ops)
return -EINVAL;
ftrace_create_filter_files(tr->ops, parent);
@ -76,8 +83,7 @@ int ftrace_create_function_files(struct trace_array *tr,
void ftrace_destroy_function_files(struct trace_array *tr)
{
ftrace_destroy_filter_files(tr->ops);
kfree(tr->ops);
tr->ops = NULL;
ftrace_free_ftrace_ops(tr);
}
static int function_trace_init(struct trace_array *tr)

8
kernel/trace/trace_functions_graph.c
View File

@ -1336,13 +1336,13 @@ static const struct file_operations graph_depth_fops = {
static __init int init_graph_tracefs(void)
{
struct dentry *d_tracer;
int ret;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
trace_create_file("max_graph_depth", 0644, d_tracer,
trace_create_file("max_graph_depth", 0644, NULL,
NULL, &graph_depth_fops);
return 0;

8
kernel/trace/trace_hwlat.c
View File

@ -538,14 +538,14 @@ static const struct file_operations window_fops = {
*/
static int init_tracefs(void)
{
struct dentry *d_tracer;
int ret;
struct dentry *top_dir;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return -ENOMEM;
top_dir = tracefs_create_dir("hwlat_detector", d_tracer);
top_dir = tracefs_create_dir("hwlat_detector", NULL);
if (!top_dir)
return -ENOMEM;

34
kernel/trace/trace_kprobe.c
View File

@ -718,6 +718,9 @@ static int trace_kprobe_create(int argc, const char *argv[])
* p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS]
* - Add kretprobe:
* r[MAXACTIVE][:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS]
* Or
* p:[GRP/]EVENT] [MOD:]KSYM[+0]%return [FETCHARGS]
*
* Fetch args:
* $retval : fetch return value
* $stack : fetch stack address
@ -747,7 +750,6 @@ static int trace_kprobe_create(int argc, const char *argv[])
switch (argv[0][0]) {
case 'r':
is_return = true;
flags |= TPARG_FL_RETURN;
break;
case 'p':
break;
@ -805,12 +807,26 @@ static int trace_kprobe_create(int argc, const char *argv[])
symbol = kstrdup(argv[1], GFP_KERNEL);
if (!symbol)
return -ENOMEM;
tmp = strchr(symbol, '%');
if (tmp) {
if (!strcmp(tmp, "%return")) {
*tmp = '\0';
is_return = true;
} else {
trace_probe_log_err(tmp - symbol, BAD_ADDR_SUFFIX);
goto parse_error;
}
}
/* TODO: support .init module functions */
ret = traceprobe_split_symbol_offset(symbol, &offset);
if (ret || offset < 0 || offset > UINT_MAX) {
trace_probe_log_err(0, BAD_PROBE_ADDR);
goto parse_error;
}
if (is_return)
flags |= TPARG_FL_RETURN;
if (kprobe_on_func_entry(NULL, symbol, offset))
flags |= TPARG_FL_FENTRY;
if (offset && is_return && !(flags & TPARG_FL_FENTRY)) {
@ -1881,8 +1897,8 @@ static __init void setup_boot_kprobe_events(void)
}
/*
* Register dynevent at subsys_initcall. This allows kernel to setup kprobe
* events in fs_initcall without tracefs.
* Register dynevent at core_initcall. This allows kernel to setup kprobe
* events in postcore_initcall without tracefs.
*/
static __init int init_kprobe_trace_early(void)
{
@ -1897,19 +1913,19 @@ static __init int init_kprobe_trace_early(void)
return 0;
}
subsys_initcall(init_kprobe_trace_early);
core_initcall(init_kprobe_trace_early);
/* Make a tracefs interface for controlling probe points */
static __init int init_kprobe_trace(void)
{
struct dentry *d_tracer;
int ret;
struct dentry *entry;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
entry = tracefs_create_file("kprobe_events", 0644, d_tracer,
entry = tracefs_create_file("kprobe_events", 0644, NULL,
NULL, &kprobe_events_ops);
/* Event list interface */
@ -1917,7 +1933,7 @@ static __init int init_kprobe_trace(void)
pr_warn("Could not create tracefs 'kprobe_events' entry\n");
/* Profile interface */
entry = tracefs_create_file("kprobe_profile", 0444, d_tracer,
entry = tracefs_create_file("kprobe_profile", 0444, NULL,
NULL, &kprobe_profile_ops);
if (!entry)

8
kernel/trace/trace_printk.c
View File

@ -367,13 +367,13 @@ static const struct file_operations ftrace_formats_fops = {
static __init int init_trace_printk_function_export(void)
{
struct dentry *d_tracer;
int ret;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
trace_create_file("printk_formats", 0444, d_tracer,
trace_create_file("printk_formats", 0444, NULL,
NULL, &ftrace_formats_fops);
return 0;

14
kernel/trace/trace_probe.h
View File

@ -16,7 +16,6 @@
#include <linux/tracefs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/ptrace.h>
#include <linux/perf_event.h>
#include <linux/kprobes.h>
@ -348,18 +347,6 @@ bool trace_probe_match_command_args(struct trace_probe *tp,
#define trace_probe_for_each_link_rcu(pos, tp) \
list_for_each_entry_rcu(pos, &(tp)->event->files, list)
/* Check the name is good for event/group/fields */
static inline bool is_good_name(const char *name)
{
if (!isalpha(*name) && *name != '_')
return false;
while (*++name != '\0') {
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
return false;
}
return true;
}
#define TPARG_FL_RETURN BIT(0)
#define TPARG_FL_KERNEL BIT(1)
#define TPARG_FL_FENTRY BIT(2)
@ -404,6 +391,7 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
C(MAXACT_TOO_BIG, "Maxactive is too big"), \
C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \
C(NO_GROUP_NAME, "Group name is not specified"), \
C(GROUP_TOO_LONG, "Group name is too long"), \
C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \

12
kernel/trace/trace_stack.c
View File

@ -554,20 +554,20 @@ __setup("stacktrace", enable_stacktrace);
static __init int stack_trace_init(void)
{
struct dentry *d_tracer;
int ret;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
trace_create_file("stack_max_size", 0644, d_tracer,
trace_create_file("stack_max_size", 0644, NULL,
&stack_trace_max_size, &stack_max_size_fops);
trace_create_file("stack_trace", 0444, d_tracer,
trace_create_file("stack_trace", 0444, NULL,
NULL, &stack_trace_fops);
#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("stack_trace_filter", 0644, d_tracer,
trace_create_file("stack_trace_filter", 0644, NULL,
&trace_ops, &stack_trace_filter_fops);
#endif

8
kernel/trace/trace_stat.c
View File

@ -276,13 +276,13 @@ static const struct file_operations tracing_stat_fops = {
static int tracing_stat_init(void)
{
struct dentry *d_tracing;
int ret;
d_tracing = tracing_init_dentry();
if (IS_ERR(d_tracing))
ret = tracing_init_dentry();
if (ret)
return -ENODEV;
stat_dir = tracefs_create_dir("trace_stat", d_tracing);
stat_dir = tracefs_create_dir("trace_stat", NULL);
if (!stat_dir) {
pr_warn("Could not create tracefs 'trace_stat' entry\n");
return -ENOMEM;

6
kernel/trace/trace_synth.h
View File

@ -7,7 +7,7 @@
#define SYNTH_SYSTEM "synthetic"
#define SYNTH_FIELDS_MAX 32
#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
#define STR_VAR_LEN_MAX MAX_FILTER_STR_VAL /* must be multiple of sizeof(u64) */
struct synth_field {
char *type;
@ -16,6 +16,8 @@ struct synth_field {
unsigned int offset;
bool is_signed;
bool is_string;
bool is_dynamic;
bool field_pos;
};
struct synth_event {
@ -24,6 +26,8 @@ struct synth_event {
char *name;
struct synth_field **fields;
unsigned int n_fields;
struct synth_field **dynamic_fields;
unsigned int n_dynamic_fields;
unsigned int n_u64;
struct trace_event_class class;
struct trace_event_call call;

24
kernel/trace/trace_uprobe.c
View File

@ -528,7 +528,7 @@ static int register_trace_uprobe(struct trace_uprobe *tu)
/*
* Argument syntax:
* - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
* - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET[%return][(REF)] [FETCHARGS]
*/
static int trace_uprobe_create(int argc, const char **argv)
{
@ -617,6 +617,19 @@ static int trace_uprobe_create(int argc, const char **argv)
}
}
/* Check if there is %return suffix */
tmp = strchr(arg, '%');
if (tmp) {
if (!strcmp(tmp, "%return")) {
*tmp = '\0';
is_return = true;
} else {
trace_probe_log_err(tmp - filename, BAD_ADDR_SUFFIX);
ret = -EINVAL;
goto fail_address_parse;
}
}
/* Parse uprobe offset. */
ret = kstrtoul(arg, 0, &offset);
if (ret) {
@ -1625,21 +1638,20 @@ void destroy_local_trace_uprobe(struct trace_event_call *event_call)
/* Make a trace interface for controling probe points */
static __init int init_uprobe_trace(void)
{
struct dentry *d_tracer;
int ret;
ret = dyn_event_register(&trace_uprobe_ops);
if (ret)
return ret;
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer))
ret = tracing_init_dentry();
if (ret)
return 0;
trace_create_file("uprobe_events", 0644, d_tracer,
trace_create_file("uprobe_events", 0644, NULL,
NULL, &uprobe_events_ops);
/* Profile interface */
trace_create_file("uprobe_profile", 0444, d_tracer,
trace_create_file("uprobe_profile", 0444, NULL,
NULL, &uprobe_profile_ops);
return 0;
}

2
kernel/trace/tracing_map.c
View File

@ -260,7 +260,7 @@ int tracing_map_add_var(struct tracing_map *map)
* to use cmp_fn.
*
* A key can be a subset of a compound key; for that purpose, the
* offset param is used to describe where within the the compound key
* offset param is used to describe where within the compound key
* the key referenced by this key field resides.
*
* Return: The index identifying the field in the map and associated

147
tools/bootconfig/main.c
View File

@ -14,18 +14,19 @@
#include <linux/kernel.h>
#include <linux/bootconfig.h>
static int xbc_show_value(struct xbc_node *node)
static int xbc_show_value(struct xbc_node *node, bool semicolon)
{
const char *val;
const char *val, *eol;
char q;
int i = 0;
eol = semicolon ? ";\n" : "\n";
xbc_array_for_each_value(node, val) {
if (strchr(val, '"'))
q = '\'';
else
q = '"';
printf("%c%s%c%s", q, val, q, node->next ? ", " : ";\n");
printf("%c%s%c%s", q, val, q, node->next ? ", " : eol);
i++;
}
return i;
@ -53,7 +54,7 @@ static void xbc_show_compact_tree(void)
continue;
} else if (cnode && xbc_node_is_value(cnode)) {
printf("%s = ", xbc_node_get_data(node));
xbc_show_value(cnode);
xbc_show_value(cnode, true);
} else {
printf("%s;\n", xbc_node_get_data(node));
}
@ -77,8 +78,28 @@ static void xbc_show_compact_tree(void)
}
}
static void xbc_show_list(void)
{
char key[XBC_KEYLEN_MAX];
struct xbc_node *leaf;
const char *val;
int ret = 0;
xbc_for_each_key_value(leaf, val) {
ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
if (ret < 0)
break;
printf("%s = ", key);
if (!val || val[0] == '\0') {
printf("\"\"\n");
continue;
}
xbc_show_value(xbc_node_get_child(leaf), false);
}
}
/* Simple real checksum */
int checksum(unsigned char *buf, int len)
static int checksum(unsigned char *buf, int len)
{
int i, sum = 0;
@ -90,7 +111,7 @@ int checksum(unsigned char *buf, int len)
#define PAGE_SIZE 4096
int load_xbc_fd(int fd, char **buf, int size)
static int load_xbc_fd(int fd, char **buf, int size)
{
int ret;
@ -107,7 +128,7 @@ int load_xbc_fd(int fd, char **buf, int size)
}
/* Return the read size or -errno */
int load_xbc_file(const char *path, char **buf)
static int load_xbc_file(const char *path, char **buf)
{
struct stat stat;
int fd, ret;
@ -126,7 +147,7 @@ int load_xbc_file(const char *path, char **buf)
return ret;
}
int load_xbc_from_initrd(int fd, char **buf)
static int load_xbc_from_initrd(int fd, char **buf)
{
struct stat stat;
int ret;
@ -195,10 +216,55 @@ int load_xbc_from_initrd(int fd, char **buf)
return size;
}
int show_xbc(const char *path)
static void show_xbc_error(const char *data, const char *msg, int pos)
{
int lin = 1, col, i;
if (pos < 0) {
pr_err("Error: %s.\n", msg);
return;
}
/* Note that pos starts from 0 but lin and col should start from 1. */
col = pos + 1;
for (i = 0; i < pos; i++) {
if (data[i] == '\n') {
lin++;
col = pos - i;
}
}
pr_err("Parse Error: %s at %d:%d\n", msg, lin, col);
}
static int init_xbc_with_error(char *buf, int len)
{
char *copy = strdup(buf);
const char *msg;
int ret, pos;
if (!copy)
return -ENOMEM;
ret = xbc_init(buf, &msg, &pos);
if (ret < 0)
show_xbc_error(copy, msg, pos);
free(copy);
return ret;
}
static int show_xbc(const char *path, bool list)
{
int ret, fd;
char *buf = NULL;
struct stat st;
ret = stat(path, &st);
if (ret < 0) {
pr_err("Failed to stat %s: %d\n", path, -errno);
return -errno;
}
fd = open(path, O_RDONLY);
if (fd < 0) {
@ -207,20 +273,33 @@ int show_xbc(const char *path)
}
ret = load_xbc_from_initrd(fd, &buf);
close(fd);
if (ret < 0) {
pr_err("Failed to load a boot config from initrd: %d\n", ret);
goto out;
}
xbc_show_compact_tree();
/* Assume a bootconfig file if it is enough small */
if (ret == 0 && st.st_size <= XBC_DATA_MAX) {
ret = load_xbc_file(path, &buf);
if (ret < 0) {
pr_err("Failed to load a boot config: %d\n", ret);
goto out;
}
if (init_xbc_with_error(buf, ret) < 0)
goto out;
}
if (list)
xbc_show_list();
else
xbc_show_compact_tree();
ret = 0;
out:
close(fd);
free(buf);
return ret;
}
int delete_xbc(const char *path)
static int delete_xbc(const char *path)
{
struct stat stat;
int ret = 0, fd, size;
@ -251,28 +330,7 @@ int delete_xbc(const char *path)
return ret;
}
static void show_xbc_error(const char *data, const char *msg, int pos)
{
int lin = 1, col, i;
if (pos < 0) {
pr_err("Error: %s.\n", msg);
return;
}
/* Note that pos starts from 0 but lin and col should start from 1. */
col = pos + 1;
for (i = 0; i < pos; i++) {
if (data[i] == '\n') {
lin++;
col = pos - i;
}
}
pr_err("Parse Error: %s at %d:%d\n", msg, lin, col);
}
int apply_xbc(const char *path, const char *xbc_path)
static int apply_xbc(const char *path, const char *xbc_path)
{
u32 size, csum;
char *buf, *data;
@ -349,14 +407,16 @@ int apply_xbc(const char *path, const char *xbc_path)
return ret;
}
int usage(void)
static int usage(void)
{
printf("Usage: bootconfig [OPTIONS] <INITRD>\n"
"Or bootconfig <CONFIG>\n"
" Apply, delete or show boot config to initrd.\n"
" Options:\n"
" -a <config>: Apply boot config to initrd\n"
" -d : Delete boot config file from initrd\n\n"
" If no option is given, show current applied boot config.\n");
" -d : Delete boot config file from initrd\n"
" -l : list boot config in initrd or file\n\n"
" If no option is given, show the bootconfig in the given file.\n");
return -1;
}
@ -364,10 +424,10 @@ int main(int argc, char **argv)
{
char *path = NULL;
char *apply = NULL;
bool delete = false;
bool delete = false, list = false;
int opt;
while ((opt = getopt(argc, argv, "hda:")) != -1) {
while ((opt = getopt(argc, argv, "hda:l")) != -1) {
switch (opt) {
case 'd':
delete = true;
@ -375,14 +435,17 @@ int main(int argc, char **argv)
case 'a':
apply = optarg;
break;
case 'l':
list = true;
break;
case 'h':
default:
return usage();
}
}
if (apply && delete) {
pr_err("Error: You can not specify both -a and -d at once.\n");
if ((apply && delete) || (delete && list) || (apply && list)) {
pr_err("Error: You can give one of -a, -d or -l at once.\n");
return usage();
}
@ -398,5 +461,5 @@ int main(int argc, char **argv)
else if (delete)
return delete_xbc(path);
return show_xbc(path);
return show_xbc(path, list);
}

199
tools/bootconfig/scripts/bconf2ftrace.sh Executable file
View File

@ -0,0 +1,199 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
usage() {
echo "Ftrace boottime trace test tool"
echo "Usage: $0 [--apply|--init] [--debug] BOOTCONFIG-FILE"
echo " --apply: Test actual apply to tracefs (need sudo)"
echo " --init: Initialize ftrace before applying (imply --apply)"
exit 1
}
[ $# -eq 0 ] && usage
BCONF=
DEBUG=
APPLY=
INIT=
while [ x"$1" != x ]; do
case "$1" in
"--debug")
DEBUG=$1;;
"--apply")
APPLY=$1;;
"--init")
APPLY=$1
INIT=$1;;
*)
[ ! -f $1 ] && usage
BCONF=$1;;
esac
shift 1
done
if [ x"$APPLY" != x ]; then
if [ `id -u` -ne 0 ]; then
echo "This must be run by root user. Try sudo." 1>&2
exec sudo $0 $DEBUG $APPLY $BCONF
fi
fi
run_cmd() { # command
echo "$*"
if [ x"$APPLY" != x ]; then # apply command
eval $*
fi
}
if [ x"$DEBUG" != x ]; then
set -x
fi
TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
if [ -z "$TRACEFS" ]; then
if ! grep -wq debugfs /proc/mounts; then
echo "Error: No tracefs/debugfs was mounted." 1>&2
exit 1
fi
TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
if [ ! -d $TRACEFS ]; then
echo "Error: ftrace is not enabled on this kernel." 1>&2
exit 1
fi
fi
if [ x"$INIT" != x ]; then
. `dirname $0`/ftrace.sh
(cd $TRACEFS; initialize_ftrace)
fi
. `dirname $0`/xbc.sh
######## main #########
set -e
xbc_init $BCONF
set_value_of() { # key file
if xbc_has_key $1; then
val=`xbc_get_val $1 1`
run_cmd "echo '$val' >> $2"
fi
}
set_array_of() { # key file
if xbc_has_key $1; then
xbc_get_val $1 | while read line; do
run_cmd "echo '$line' >> $2"
done
fi
}
compose_synth() { # event_name branch
echo -n "$1 "
xbc_get_val $2 | while read field; do echo -n "$field; "; done
}
setup_event() { # prefix group event [instance]
branch=$1.$2.$3
if [ "$4" ]; then
eventdir="$TRACEFS/instances/$4/events/$2/$3"
else
eventdir="$TRACEFS/events/$2/$3"
fi
case $2 in
kprobes)
xbc_get_val ${branch}.probes | while read line; do
run_cmd "echo 'p:kprobes/$3 $line' >> $TRACEFS/kprobe_events"
done
;;
synthetic)
run_cmd "echo '`compose_synth $3 ${branch}.fields`' >> $TRACEFS/synthetic_events"
;;
esac
set_value_of ${branch}.filter ${eventdir}/filter
set_array_of ${branch}.actions ${eventdir}/trigger
if xbc_has_key ${branch}.enable; then
run_cmd "echo 1 > ${eventdir}/enable"
fi
}
setup_events() { # prefix("ftrace" or "ftrace.instance.INSTANCE") [instance]
prefix="${1}.event"
if xbc_has_branch ${1}.event; then
for grpev in `xbc_subkeys ${1}.event 2`; do
setup_event $prefix ${grpev%.*} ${grpev#*.} $2
done
fi
}
size2kb() { # size[KB|MB]
case $1 in
*KB)
echo ${1%KB};;
*MB)
expr ${1%MB} \* 1024;;
*)
expr $1 / 1024 ;;
esac
}
setup_instance() { # [instance]
if [ "$1" ]; then
instance="ftrace.instance.${1}"
instancedir=$TRACEFS/instances/$1
else
instance="ftrace"
instancedir=$TRACEFS
fi
set_array_of ${instance}.options ${instancedir}/trace_options
set_value_of ${instance}.trace_clock ${instancedir}/trace_clock
set_value_of ${instance}.cpumask ${instancedir}/tracing_cpumask
set_value_of ${instance}.tracer ${instancedir}/current_tracer
set_array_of ${instance}.ftrace.filters \
${instancedir}/set_ftrace_filter
set_array_of ${instance}.ftrace.notrace \
${instancedir}/set_ftrace_notrace
if xbc_has_key ${instance}.alloc_snapshot; then
run_cmd "echo 1 > ${instancedir}/snapshot"
fi
if xbc_has_key ${instance}.buffer_size; then
size=`xbc_get_val ${instance}.buffer_size 1`
size=`eval size2kb $size`
run_cmd "echo $size >> ${instancedir}/buffer_size_kb"
fi
setup_events ${instance} $1
set_array_of ${instance}.events ${instancedir}/set_event
}
# ftrace global configs (kernel.*)
if xbc_has_key "kernel.dump_on_oops"; then
dump_mode=`xbc_get_val "kernel.dump_on_oops" 1`
[ "$dump_mode" ] && dump_mode=`eval echo $dump_mode` || dump_mode=1
run_cmd "echo \"$dump_mode\" > /proc/sys/kernel/ftrace_dump_on_oops"
fi
set_value_of kernel.fgraph_max_depth $TRACEFS/max_graph_depth
set_array_of kernel.fgraph_filters $TRACEFS/set_graph_function
set_array_of kernel.fgraph_notraces $TRACEFS/set_graph_notrace
# Per-instance/per-event configs
if ! xbc_has_branch "ftrace" ; then
exit 0
fi
setup_instance # root instance
if xbc_has_branch "ftrace.instance"; then
for i in `xbc_subkeys "ftrace.instance" 1`; do
run_cmd "mkdir -p $TRACEFS/instances/$i"
setup_instance $i
done
fi

109
tools/bootconfig/scripts/ftrace.sh Normal file
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@ -0,0 +1,109 @@
# SPDX-License-Identifier: GPL-2.0-only
clear_trace() { # reset trace output
echo > trace
}
disable_tracing() { # stop trace recording
echo 0 > tracing_on
}
enable_tracing() { # start trace recording
echo 1 > tracing_on
}
reset_tracer() { # reset the current tracer
echo nop > current_tracer
}
reset_trigger_file() {
# remove action triggers first
grep -H ':on[^:]*(' $@ |
while read line; do
cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
file=`echo $line | cut -f1 -d:`
echo "!$cmd" >> $file
done
grep -Hv ^# $@ |
while read line; do
cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["`
file=`echo $line | cut -f1 -d:`
echo "!$cmd" > $file
done
}
reset_trigger() { # reset all current setting triggers
if [ -d events/synthetic ]; then
reset_trigger_file events/synthetic/*/trigger
fi
reset_trigger_file events/*/*/trigger
}
reset_events_filter() { # reset all current setting filters
grep -v ^none events/*/*/filter |
while read line; do
echo 0 > `echo $line | cut -f1 -d:`
done
}
reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
if [ ! -f set_ftrace_filter ]; then
return 0
fi
echo > set_ftrace_filter
grep -v '^#' set_ftrace_filter | while read t; do
tr=`echo $t | cut -d: -f2`
if [ "$tr" = "" ]; then
continue
fi
if ! grep -q "$t" set_ftrace_filter; then
continue;
fi
name=`echo $t | cut -d: -f1 | cut -d' ' -f1`
if [ $tr = "enable_event" -o $tr = "disable_event" ]; then
tr=`echo $t | cut -d: -f2-4`
limit=`echo $t | cut -d: -f5`
else
tr=`echo $t | cut -d: -f2`
limit=`echo $t | cut -d: -f3`
fi
if [ "$limit" != "unlimited" ]; then
tr="$tr:$limit"
fi
echo "!$name:$tr" > set_ftrace_filter
done
}
disable_events() {
echo 0 > events/enable
}
clear_synthetic_events() { # reset all current synthetic events
grep -v ^# synthetic_events |
while read line; do
echo "!$line" >> synthetic_events
done
}
initialize_ftrace() { # Reset ftrace to initial-state
# As the initial state, ftrace will be set to nop tracer,
# no events, no triggers, no filters, no function filters,
# no probes, and tracing on.
disable_tracing
reset_tracer
reset_trigger
reset_events_filter
reset_ftrace_filter
disable_events
[ -f set_event_pid ] && echo > set_event_pid
[ -f set_ftrace_pid ] && echo > set_ftrace_pid
[ -f set_ftrace_notrace ] && echo > set_ftrace_notrace
[ -f set_graph_function ] && echo | tee set_graph_*
[ -f stack_trace_filter ] && echo > stack_trace_filter
[ -f kprobe_events ] && echo > kprobe_events
[ -f uprobe_events ] && echo > uprobe_events
[ -f synthetic_events ] && echo > synthetic_events
[ -f snapshot ] && echo 0 > snapshot
clear_trace
enable_tracing
}

244
tools/bootconfig/scripts/ftrace2bconf.sh Executable file
View File

@ -0,0 +1,244 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
usage() {
echo "Dump boot-time tracing bootconfig from ftrace"
echo "Usage: $0 [--debug] [ > BOOTCONFIG-FILE]"
exit 1
}
DEBUG=
while [ x"$1" != x ]; do
case "$1" in
"--debug")
DEBUG=$1;;
-*)
usage
;;
esac
shift 1
done
if [ x"$DEBUG" != x ]; then
set -x
fi
TRACEFS=`grep -m 1 -w tracefs /proc/mounts | cut -f 2 -d " "`
if [ -z "$TRACEFS" ]; then
if ! grep -wq debugfs /proc/mounts; then
echo "Error: No tracefs/debugfs was mounted."
exit 1
fi
TRACEFS=`grep -m 1 -w debugfs /proc/mounts | cut -f 2 -d " "`/tracing
if [ ! -d $TRACEFS ]; then
echo "Error: ftrace is not enabled on this kernel." 1>&2
exit 1
fi
fi
######## main #########
set -e
emit_kv() { # key =|+= value
echo "$@"
}
global_options() {
val=`cat $TRACEFS/max_graph_depth`
[ $val != 0 ] && emit_kv kernel.fgraph_max_depth = $val
if grep -qv "^#" $TRACEFS/set_graph_function $TRACEFS/set_graph_notrace ; then
cat 1>&2 << EOF
# WARN: kernel.fgraph_filters and kernel.fgraph_notrace are not supported, since the wild card expression was expanded and lost from memory.
EOF
fi
}
kprobe_event_options() {
cat $TRACEFS/kprobe_events | while read p args; do
case $p in
r*)
cat 1>&2 << EOF
# WARN: A return probe found but it is not supported by bootconfig. Skip it.
EOF
continue;;
esac
p=${p#*:}
event=${p#*/}
group=${p%/*}
if [ $group != "kprobes" ]; then
cat 1>&2 << EOF
# WARN: kprobes group name $group is changed to "kprobes" for bootconfig.
EOF
fi
emit_kv $PREFIX.event.kprobes.$event.probes += $args
done
}
synth_event_options() {
cat $TRACEFS/synthetic_events | while read event fields; do
emit_kv $PREFIX.event.synthetic.$event.fields = `echo $fields | sed "s/;/,/g"`
done
}
# Variables resolver
DEFINED_VARS=
UNRESOLVED_EVENTS=
defined_vars() { # event-dir
grep "^hist" $1/trigger | grep -o ':[a-zA-Z0-9]*='
}
referred_vars() {
grep "^hist" $1/trigger | grep -o '$[a-zA-Z0-9]*'
}
per_event_options() { # event-dir
evdir=$1
# Check the special event which has no filter and no trigger
[ ! -f $evdir/filter ] && return
if grep -q "^hist:" $evdir/trigger; then
# hist action can refer the undefined variables
__vars=`defined_vars $evdir`
for v in `referred_vars $evdir`; do
if echo $DEFINED_VARS $__vars | grep -vqw ${v#$}; then
# $v is not defined yet, defer it
UNRESOLVED_EVENTS="$UNRESOLVED_EVENTS $evdir"
return;
fi
done
DEFINED_VARS="$DEFINED_VARS "`defined_vars $evdir`
fi
grep -v "^#" $evdir/trigger | while read action active; do
emit_kv $PREFIX.event.$group.$event.actions += \'$action\'
done
# enable is not checked; this is done by set_event in the instance.
val=`cat $evdir/filter`
if [ "$val" != "none" ]; then
emit_kv $PREFIX.event.$group.$event.filter = "$val"
fi
}
retry_unresolved() {
unresolved=$UNRESOLVED_EVENTS
UNRESOLVED_EVENTS=
for evdir in $unresolved; do
event=${evdir##*/}
group=${evdir%/*}; group=${group##*/}
per_event_options $evdir
done
}
event_options() {
# PREFIX and INSTANCE must be set
if [ $PREFIX = "ftrace" ]; then
# define the dynamic events
kprobe_event_options
synth_event_options
fi
for group in `ls $INSTANCE/events/` ; do
[ ! -d $INSTANCE/events/$group ] && continue
for event in `ls $INSTANCE/events/$group/` ;do
[ ! -d $INSTANCE/events/$group/$event ] && continue
per_event_options $INSTANCE/events/$group/$event
done
done
retry=0
while [ $retry -lt 3 ]; do
retry_unresolved
retry=$((retry + 1))
done
if [ "$UNRESOLVED_EVENTS" ]; then
cat 1>&2 << EOF
! ERROR: hist triggers in $UNRESOLVED_EVENTS use some undefined variables.
EOF
fi
}
is_default_trace_option() { # option
grep -qw $1 << EOF
print-parent
nosym-offset
nosym-addr
noverbose
noraw
nohex
nobin
noblock
trace_printk
annotate
nouserstacktrace
nosym-userobj
noprintk-msg-only
context-info
nolatency-format
record-cmd
norecord-tgid
overwrite
nodisable_on_free
irq-info
markers
noevent-fork
nopause-on-trace
function-trace
nofunction-fork
nodisplay-graph
nostacktrace
notest_nop_accept
notest_nop_refuse
EOF
}
instance_options() { # [instance-name]
if [ $# -eq 0 ]; then
PREFIX="ftrace"
INSTANCE=$TRACEFS
else
PREFIX="ftrace.instance.$1"
INSTANCE=$TRACEFS/instances/$1
fi
val=
for i in `cat $INSTANCE/trace_options`; do
is_default_trace_option $i && continue
val="$val, $i"
done
[ "$val" ] && emit_kv $PREFIX.options = "${val#,}"
val="local"
for i in `cat $INSTANCE/trace_clock` ; do
[ "${i#*]}" ] && continue
i=${i%]}; val=${i#[}
done
[ $val != "local" ] && emit_kv $PREFIX.trace_clock = $val
val=`cat $INSTANCE/buffer_size_kb`
if echo $val | grep -vq "expanded" ; then
emit_kv $PREFIX.buffer_size = $val"KB"
fi
if grep -q "is allocated" $INSTANCE/snapshot ; then
emit_kv $PREFIX.alloc_snapshot
fi
val=`cat $INSTANCE/tracing_cpumask`
if [ `echo $val | sed -e s/f//g`x != x ]; then
emit_kv $PREFIX.cpumask = $val
fi
val=
for i in `cat $INSTANCE/set_event`; do
val="$val, $i"
done
[ "$val" ] && emit_kv $PREFIX.events = "${val#,}"
val=`cat $INSTANCE/current_tracer`
[ $val != nop ] && emit_kv $PREFIX.tracer = $val
if grep -qv "^#" $INSTANCE/set_ftrace_filter $INSTANCE/set_ftrace_notrace; then
cat 1>&2 << EOF
# WARN: kernel.ftrace.filters and kernel.ftrace.notrace are not supported, since the wild card expression was expanded and lost from memory.
EOF
fi
event_options
}
global_options
instance_options
for i in `ls $TRACEFS/instances` ; do
instance_options $i
done

56
tools/bootconfig/scripts/xbc.sh Normal file
View File

@ -0,0 +1,56 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# bootconfig utility functions
XBC_TMPFILE=
XBC_BASEDIR=`dirname $0`
BOOTCONFIG=${BOOTCONFIG:=$XBC_BASEDIR/../bootconfig}
if [ ! -x "$BOOTCONFIG" ]; then
BOOTCONFIG=`which bootconfig`
if [ -z "$BOOTCONFIG" ]; then
echo "Erorr: bootconfig command is not found" 1>&2
exit 1
fi
fi
xbc_cleanup() {
if [ "$XBC_TMPFILE" ]; then
rm -f "$XBC_TMPFILE"
fi
}
xbc_init() { # bootconfig-file
xbc_cleanup
XBC_TMPFILE=`mktemp bconf-XXXX`
trap xbc_cleanup EXIT TERM
$BOOTCONFIG -l $1 > $XBC_TMPFILE || exit 1
}
nr_args() { # args
echo $#
}
xbc_get_val() { # key [maxnum]
if [ "$2" ]; then
MAXOPT="-L $2"
fi
grep "^$1 =" $XBC_TMPFILE | cut -d= -f2- | \
sed -e 's/", /" /g' -e "s/',/' /g" | \
xargs $MAXOPT -n 1 echo
}
xbc_has_key() { # key
grep -q "^$1 =" $XBC_TMPFILE
}
xbc_has_branch() { # prefix-key
grep -q "^$1" $XBC_TMPFILE
}
xbc_subkeys() { # prefix-key depth
__keys=`echo $1 | sed "s/\./ /g"`
__s=`nr_args $__keys`
grep "^$1" $XBC_TMPFILE | cut -d= -f1| cut -d. -f$((__s + 1))-$((__s + $2)) | uniq
}

6
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
View File

@ -97,4 +97,10 @@ check_error 'p:kprobes/testevent kernel_clone ^abcd=\"foo"' # DIFF_ARG_TYPE
check_error '^p:kprobes/testevent kernel_clone abcd=\1' # SAME_PROBE
fi
# %return suffix errors
if grep -q "place (kretprobe): .*%return.*" README; then
check_error 'p vfs_read^%hoge' # BAD_ADDR_SUFFIX
check_error 'p ^vfs_read+10%return' # BAD_RETPROBE
fi
exit 0

21
tools/testing/selftests/ftrace/test.d/kprobe/kretprobe_return_suffix.tc Normal file
View File

@ -0,0 +1,21 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Kretprobe %%return suffix test
# requires: kprobe_events '<symbol>[+<offset>]%return':README
# Test for kretprobe by "r"
echo 'r:myprobeaccept vfs_read' > kprobe_events
RESULT1=`cat kprobe_events`
# Test for kretprobe by "%return"
echo 'p:myprobeaccept vfs_read%return' > kprobe_events
RESULT2=`cat kprobe_events`
if [ "$RESULT1" != "$RESULT2" ]; then
echo "Error: %return suffix didn't make a return probe."
echo "r-command: $RESULT1"
echo "%return: $RESULT2"
exit_fail
fi
echo > kprobe_events

6
tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
View File

@ -17,4 +17,10 @@ check_error 'p /bin/sh:10(10)^a' # BAD_REFCNT_SUFFIX
check_error 'p /bin/sh:10 ^@+ab' # BAD_FILE_OFFS
check_error 'p /bin/sh:10 ^@symbol' # SYM_ON_UPROBE
# %return suffix error
if grep -q "place (uprobe): .*%return.*" README; then
check_error 'p /bin/sh:10^%hoge' # BAD_ADDR_SUFFIX
check_error 'p /bin/sh:10(10)^%return' # BAD_REFCNT_SUFFIX
fi
exit 0

8
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-inter-event-combined-hist.tc
View File

@ -25,12 +25,12 @@ echo 'wakeup_latency u64 lat pid_t pid' >> synthetic_events
echo 'hist:keys=pid:ts1=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_wakeup/trigger
echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts1:onmatch(sched.sched_wakeup).wakeup_latency($wakeup_lat,next_pid) if next_comm=="ping"' > events/sched/sched_switch/trigger
echo 'waking+wakeup_latency u64 lat; pid_t pid' >> synthetic_events
echo 'hist:keys=pid,lat:sort=pid,lat:ww_lat=$waking_lat+$wakeup_lat:onmatch(synthetic.wakeup_latency).waking+wakeup_latency($ww_lat,pid)' >> events/synthetic/wakeup_latency/trigger
echo 'hist:keys=pid,lat:sort=pid,lat' >> events/synthetic/waking+wakeup_latency/trigger
echo 'waking_plus_wakeup_latency u64 lat; pid_t pid' >> synthetic_events
echo 'hist:keys=pid,lat:sort=pid,lat:ww_lat=$waking_lat+$wakeup_lat:onmatch(synthetic.wakeup_latency).waking_plus_wakeup_latency($ww_lat,pid)' >> events/synthetic/wakeup_latency/trigger
echo 'hist:keys=pid,lat:sort=pid,lat' >> events/synthetic/waking_plus_wakeup_latency/trigger
ping $LOCALHOST -c 3
if ! grep -q "pid:" events/synthetic/waking+wakeup_latency/hist; then
if ! grep -q "pid:" events/synthetic/waking_plus_wakeup_latency/hist; then
fail "Failed to create combined histogram"
fi

31
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-dynstring.tc Normal file
View File

@ -0,0 +1,31 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test inter-event histogram trigger trace action with dynamic string param
# requires: set_event synthetic_events events/sched/sched_process_exec/hist "char name[]' >> synthetic_events":README
fail() { #msg
echo $1
exit_fail
}
echo "Test create synthetic event"
echo 'ping_test_latency u64 lat; char filename[]' > synthetic_events
if [ ! -d events/synthetic/ping_test_latency ]; then
fail "Failed to create ping_test_latency synthetic event"
fi
echo "Test create histogram for synthetic event using trace action and dynamic strings"
echo "Test histogram dynamic string variables,simple expression support and trace action"
echo 'hist:key=pid:filenamevar=filename:ts0=common_timestamp.usecs' > events/sched/sched_process_exec/trigger
echo 'hist:key=pid:lat=common_timestamp.usecs-$ts0:onmatch(sched.sched_process_exec).ping_test_latency($lat,$filenamevar) if comm == "ping"' > events/sched/sched_process_exit/trigger
echo 'hist:keys=filename,lat:sort=filename,lat' > events/synthetic/ping_test_latency/trigger
ping $LOCALHOST -c 5
if ! grep -q "ping" events/synthetic/ping_test_latency/hist; then
fail "Failed to create dynamic string trace action inter-event histogram"
fi
exit 0

19
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic_event_syntax_errors.tc Normal file
View File

@ -0,0 +1,19 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test synthetic_events syntax parser errors
# requires: synthetic_events error_log
check_error() { # command-with-error-pos-by-^
ftrace_errlog_check 'synthetic_events' "$1" 'synthetic_events'
}
check_error 'myevent ^chr arg' # INVALID_TYPE
check_error 'myevent ^char str[];; int v' # INVALID_TYPE
check_error 'myevent char ^str]; int v' # INVALID_NAME
check_error 'myevent char ^str;[]' # INVALID_NAME
check_error 'myevent ^char str[; int v' # INVALID_TYPE
check_error '^mye;vent char str[]' # BAD_NAME
check_error 'myevent char str[]; ^int' # INVALID_FIELD
check_error '^myevent' # INCOMPLETE_CMD
exit 0