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The major changes in this tracing update includes: 

- Removing of non-DYNAMIC_FTRACE from 32bit x86
 
  - Removing of mcount support from x86
 
  - Emulating a call from int3 on x86_64, fixes live kernel patching
 
  - Consolidated Tracing Error logs file
 
 Minor updates:
 
  - Removal of klp_check_compiler_support()
 
  - kdb ftrace dumping output changes
 
  - Accessing and creating ftrace instances from inside the kernel
 
  - Clean up of #define if macro
 
  - Introduction of TRACE_EVENT_NOP() to disable trace events based on config
    options
 
 And other minor fixes and clean ups
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Merge tag 'trace-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:
 "The major changes in this tracing update includes:

   - Removal of non-DYNAMIC_FTRACE from 32bit x86

   - Removal of mcount support from x86

   - Emulating a call from int3 on x86_64, fixes live kernel patching

   - Consolidated Tracing Error logs file

  Minor updates:

   - Removal of klp_check_compiler_support()

   - kdb ftrace dumping output changes

   - Accessing and creating ftrace instances from inside the kernel

   - Clean up of #define if macro

   - Introduction of TRACE_EVENT_NOP() to disable trace events based on
     config options

  And other minor fixes and clean ups"

* tag 'trace-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (44 commits)
  x86: Hide the int3_emulate_call/jmp functions from UML
  livepatch: Remove klp_check_compiler_support()
  ftrace/x86: Remove mcount support
  ftrace/x86_32: Remove support for non DYNAMIC_FTRACE
  tracing: Simplify "if" macro code
  tracing: Fix documentation about disabling options using trace_options
  tracing: Replace kzalloc with kcalloc
  tracing: Fix partial reading of trace event's id file
  tracing: Allow RCU to run between postponed startup tests
  tracing: Fix white space issues in parse_pred() function
  tracing: Eliminate const char[] auto variables
  ring-buffer: Fix mispelling of Calculate
  tracing: probeevent: Fix to make the type of $comm string
  tracing: probeevent: Do not accumulate on ret variable
  tracing: uprobes: Re-enable $comm support for uprobe events
  ftrace/x86_64: Emulate call function while updating in breakpoint handler
  x86_64: Allow breakpoints to emulate call instructions
  x86_64: Add gap to int3 to allow for call emulation
  tracing: kdb: Allow ftdump to skip all but the last few entries
  tracing: Add trace_total_entries() / trace_total_entries_cpu()
  ...
This commit is contained in:
Linus Torvalds 2019-05-15 16:05:47 -07:00
parent 2bbacd1a92 693713cbdb
commit d2d8b14604
44 changed files with 1343 additions and 649 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
Documentation/trace/ftrace.rst
View File

@ -765,6 +765,37 @@ Here is the list of current tracers that may be configured.
tracers from tracing simply echo "nop" into
current_tracer.
Error conditions
----------------
For most ftrace commands, failure modes are obvious and communicated
using standard return codes.
For other more involved commands, extended error information may be
available via the tracing/error_log file. For the commands that
support it, reading the tracing/error_log file after an error will
display more detailed information about what went wrong, if
information is available. The tracing/error_log file is a circular
error log displaying a small number (currently, 8) of ftrace errors
for the last (8) failed commands.
The extended error information and usage takes the form shown in
this example::
# echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
echo: write error: Invalid argument
# cat /sys/kernel/debug/tracing/error_log
[ 5348.887237] location: error: Couldn't yyy: zzz
Command: xxx
^
[ 7517.023364] location: error: Bad rrr: sss
Command: ppp qqq
^
To clear the error log, echo the empty string into it::
# echo > /sys/kernel/debug/tracing/error_log
Examples of using the tracer
----------------------------

16
Documentation/trace/histogram.rst
View File

@ -199,20 +199,8 @@ Extended error information
For some error conditions encountered when invoking a hist trigger
command, extended error information is available via the
corresponding event's 'hist' file. Reading the hist file after an
error will display more detailed information about what went wrong,
if information is available. This extended error information will
be available until the next hist trigger command for that event.
If available for a given error condition, the extended error
information and usage takes the following form::
# echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
echo: write error: Invalid argument
# cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist
ERROR: Couldn't yyy: zzz
Last command: xxx
tracing/error_log file. See Error Conditions in
:file:`Documentation/trace/ftrace.rst` for details.
6.2 'hist' trigger examples
---------------------------

1
arch/nds32/kernel/ftrace.c
View File

@ -7,7 +7,6 @@
#ifndef CONFIG_DYNAMIC_FTRACE
extern void (*ftrace_trace_function)(unsigned long, unsigned long,
struct ftrace_ops*, struct pt_regs*);
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
extern void ftrace_graph_caller(void);
noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,

1
arch/parisc/kernel/ftrace.c
View File

@ -51,7 +51,6 @@ void notrace __hot ftrace_function_trampoline(unsigned long parent,
unsigned long org_sp_gr3)
{
extern ftrace_func_t ftrace_trace_function; /* depends on CONFIG_DYNAMIC_FTRACE */
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
if (ftrace_trace_function != ftrace_stub) {
/* struct ftrace_ops *op, struct pt_regs *regs); */

5
arch/powerpc/include/asm/livepatch.h
View File

@ -24,11 +24,6 @@
#include <linux/sched/task_stack.h>
#ifdef CONFIG_LIVEPATCH
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->nip = ip;

5
arch/s390/include/asm/livepatch.h
View File

@ -13,11 +13,6 @@
#include <asm/ptrace.h>
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->psw.addr = ip;

11
arch/x86/Kconfig
View File

@ -31,6 +31,17 @@ config X86_64
select SWIOTLB
select ARCH_HAS_SYSCALL_WRAPPER
config FORCE_DYNAMIC_FTRACE
def_bool y
depends on X86_32
depends on FUNCTION_TRACER
select DYNAMIC_FTRACE
help
We keep the static function tracing (!DYNAMIC_FTRACE) around
in order to test the non static function tracing in the
generic code, as other architectures still use it. But we
only need to keep it around for x86_64. No need to keep it
for x86_32. For x86_32, force DYNAMIC_FTRACE.
#
# Arch settings
#

18
arch/x86/entry/entry_64.S
View File

@ -878,7 +878,7 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
* @paranoid == 2 is special: the stub will never switch stacks. This is for
* #DF: if the thread stack is somehow unusable, we'll still get a useful OOPS.
*/
.macro idtentry sym do_sym has_error_code:req paranoid=0 shift_ist=-1 ist_offset=0
.macro idtentry sym do_sym has_error_code:req paranoid=0 shift_ist=-1 ist_offset=0 create_gap=0
ENTRY(\sym)
UNWIND_HINT_IRET_REGS offset=\has_error_code*8
@ -898,6 +898,20 @@ ENTRY(\sym)
jnz .Lfrom_usermode_switch_stack_\@
.endif
.if \create_gap == 1
/*
* If coming from kernel space, create a 6-word gap to allow the
* int3 handler to emulate a call instruction.
*/
testb $3, CS-ORIG_RAX(%rsp)
jnz .Lfrom_usermode_no_gap_\@
.rept 6
pushq 5*8(%rsp)
.endr
UNWIND_HINT_IRET_REGS offset=8
.Lfrom_usermode_no_gap_\@:
.endif
.if \paranoid
call paranoid_entry
.else
@ -1129,7 +1143,7 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \
#endif /* CONFIG_HYPERV */
idtentry debug do_debug has_error_code=0 paranoid=1 shift_ist=IST_INDEX_DB ist_offset=DB_STACK_OFFSET
idtentry int3 do_int3 has_error_code=0
idtentry int3 do_int3 has_error_code=0 create_gap=1
idtentry stack_segment do_stack_segment has_error_code=1
#ifdef CONFIG_XEN_PV

8
arch/x86/include/asm/ftrace.h
View File

@ -3,12 +3,10 @@
#define _ASM_X86_FTRACE_H
#ifdef CONFIG_FUNCTION_TRACER
#ifdef CC_USING_FENTRY
# define MCOUNT_ADDR ((unsigned long)(__fentry__))
#else
# define MCOUNT_ADDR ((unsigned long)(mcount))
# define HAVE_FUNCTION_GRAPH_FP_TEST
#ifndef CC_USING_FENTRY
# error Compiler does not support fentry?
#endif
# define MCOUNT_ADDR ((unsigned long)(__fentry__))
#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
#ifdef CONFIG_DYNAMIC_FTRACE

8
arch/x86/include/asm/livepatch.h
View File

@ -24,14 +24,6 @@
#include <asm/setup.h>
#include <linux/ftrace.h>
static inline int klp_check_compiler_support(void)
{
#ifndef CC_USING_FENTRY
return 1;
#endif
return 0;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->ip = ip;

30
arch/x86/include/asm/text-patching.h
View File

@ -42,4 +42,34 @@ extern int after_bootmem;
extern __ro_after_init struct mm_struct *poking_mm;
extern __ro_after_init unsigned long poking_addr;
#ifndef CONFIG_UML_X86
static inline void int3_emulate_jmp(struct pt_regs *regs, unsigned long ip)
{
regs->ip = ip;
}
#define INT3_INSN_SIZE 1
#define CALL_INSN_SIZE 5
#ifdef CONFIG_X86_64
static inline void int3_emulate_push(struct pt_regs *regs, unsigned long val)
{
/*
* The int3 handler in entry_64.S adds a gap between the
* stack where the break point happened, and the saving of
* pt_regs. We can extend the original stack because of
* this gap. See the idtentry macro's create_gap option.
*/
regs->sp -= sizeof(unsigned long);
*(unsigned long *)regs->sp = val;
}
static inline void int3_emulate_call(struct pt_regs *regs, unsigned long func)
{
int3_emulate_push(regs, regs->ip - INT3_INSN_SIZE + CALL_INSN_SIZE);
int3_emulate_jmp(regs, func);
}
#endif /* CONFIG_X86_64 */
#endif /* !CONFIG_UML_X86 */
#endif /* _ASM_X86_TEXT_PATCHING_H */

32
arch/x86/kernel/ftrace.c
View File

@ -29,6 +29,7 @@
#include <asm/kprobes.h>
#include <asm/ftrace.h>
#include <asm/nops.h>
#include <asm/text-patching.h>
#ifdef CONFIG_DYNAMIC_FTRACE
@ -231,6 +232,7 @@ int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
}
static unsigned long ftrace_update_func;
static unsigned long ftrace_update_func_call;
static int update_ftrace_func(unsigned long ip, void *new)
{
@ -259,6 +261,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
unsigned char *new;
int ret;
ftrace_update_func_call = (unsigned long)func;
new = ftrace_call_replace(ip, (unsigned long)func);
ret = update_ftrace_func(ip, new);
@ -294,13 +298,28 @@ int ftrace_int3_handler(struct pt_regs *regs)
if (WARN_ON_ONCE(!regs))
return 0;
ip = regs->ip - 1;
if (!ftrace_location(ip) && !is_ftrace_caller(ip))
return 0;
ip = regs->ip - INT3_INSN_SIZE;
regs->ip += MCOUNT_INSN_SIZE - 1;
#ifdef CONFIG_X86_64
if (ftrace_location(ip)) {
int3_emulate_call(regs, (unsigned long)ftrace_regs_caller);
return 1;
} else if (is_ftrace_caller(ip)) {
if (!ftrace_update_func_call) {
int3_emulate_jmp(regs, ip + CALL_INSN_SIZE);
return 1;
}
int3_emulate_call(regs, ftrace_update_func_call);
return 1;
}
#else
if (ftrace_location(ip) || is_ftrace_caller(ip)) {
int3_emulate_jmp(regs, ip + CALL_INSN_SIZE);
return 1;
}
#endif
return 1;
return 0;
}
NOKPROBE_SYMBOL(ftrace_int3_handler);
@ -865,6 +884,8 @@ void arch_ftrace_update_trampoline(struct ftrace_ops *ops)
func = ftrace_ops_get_func(ops);
ftrace_update_func_call = (unsigned long)func;
/* Do a safe modify in case the trampoline is executing */
new = ftrace_call_replace(ip, (unsigned long)func);
ret = update_ftrace_func(ip, new);
@ -966,6 +987,7 @@ static int ftrace_mod_jmp(unsigned long ip, void *func)
{
unsigned char *new;
ftrace_update_func_call = 0UL;
new = ftrace_jmp_replace(ip, (unsigned long)func);
return update_ftrace_func(ip, new);

75
arch/x86/kernel/ftrace_32.S
View File

@ -10,22 +10,10 @@
#include <asm/ftrace.h>
#include <asm/nospec-branch.h>
#ifdef CC_USING_FENTRY
# define function_hook __fentry__
EXPORT_SYMBOL(__fentry__)
#else
# define function_hook mcount
EXPORT_SYMBOL(mcount)
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
/* mcount uses a frame pointer even if CONFIG_FRAME_POINTER is not set */
#if !defined(CC_USING_FENTRY) || defined(CONFIG_FRAME_POINTER)
# define USING_FRAME_POINTER
#endif
#ifdef USING_FRAME_POINTER
#ifdef CONFIG_FRAME_POINTER
# define MCOUNT_FRAME 1 /* using frame = true */
#else
# define MCOUNT_FRAME 0 /* using frame = false */
@ -37,8 +25,7 @@ END(function_hook)
ENTRY(ftrace_caller)
#ifdef USING_FRAME_POINTER
# ifdef CC_USING_FENTRY
#ifdef CONFIG_FRAME_POINTER
/*
* Frame pointers are of ip followed by bp.
* Since fentry is an immediate jump, we are left with
@ -49,7 +36,7 @@ ENTRY(ftrace_caller)
pushl %ebp
movl %esp, %ebp
pushl 2*4(%esp) /* function ip */
# endif
/* For mcount, the function ip is directly above */
pushl %ebp
movl %esp, %ebp
@ -59,7 +46,7 @@ ENTRY(ftrace_caller)
pushl %edx
pushl $0 /* Pass NULL as regs pointer */
#ifdef USING_FRAME_POINTER
#ifdef CONFIG_FRAME_POINTER
/* Load parent ebp into edx */
movl 4*4(%esp), %edx
#else
@ -82,13 +69,11 @@ ftrace_call:
popl %edx
popl %ecx
popl %eax
#ifdef USING_FRAME_POINTER
#ifdef CONFIG_FRAME_POINTER
popl %ebp
# ifdef CC_USING_FENTRY
addl $4,%esp /* skip function ip */
popl %ebp /* this is the orig bp */
addl $4, %esp /* skip parent ip */
# endif
#endif
.Lftrace_ret:
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@ -133,11 +118,7 @@ ENTRY(ftrace_regs_caller)
movl 12*4(%esp), %eax /* Load ip (1st parameter) */
subl $MCOUNT_INSN_SIZE, %eax /* Adjust ip */
#ifdef CC_USING_FENTRY
movl 15*4(%esp), %edx /* Load parent ip (2nd parameter) */
#else
movl 0x4(%ebp), %edx /* Load parent ip (2nd parameter) */
#endif
movl function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
pushl %esp /* Save pt_regs as 4th parameter */
@ -170,43 +151,6 @@ GLOBAL(ftrace_regs_call)
lea 3*4(%esp), %esp /* Skip orig_ax, ip and cs */
jmp .Lftrace_ret
#else /* ! CONFIG_DYNAMIC_FTRACE */
ENTRY(function_hook)
cmpl $__PAGE_OFFSET, %esp
jb ftrace_stub /* Paging not enabled yet? */
cmpl $ftrace_stub, ftrace_trace_function
jnz .Ltrace
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
cmpl $ftrace_stub, ftrace_graph_return
jnz ftrace_graph_caller
cmpl $ftrace_graph_entry_stub, ftrace_graph_entry
jnz ftrace_graph_caller
#endif
.globl ftrace_stub
ftrace_stub:
ret
/* taken from glibc */
.Ltrace:
pushl %eax
pushl %ecx
pushl %edx
movl 0xc(%esp), %eax
movl 0x4(%ebp), %edx
subl $MCOUNT_INSN_SIZE, %eax
movl ftrace_trace_function, %ecx
CALL_NOSPEC %ecx
popl %edx
popl %ecx
popl %eax
jmp ftrace_stub
END(function_hook)
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(ftrace_graph_caller)
@ -215,13 +159,8 @@ ENTRY(ftrace_graph_caller)
pushl %edx
movl 3*4(%esp), %eax
/* Even with frame pointers, fentry doesn't have one here */
#ifdef CC_USING_FENTRY
lea 4*4(%esp), %edx
movl $0, %ecx
#else
lea 0x4(%ebp), %edx
movl (%ebp), %ecx
#endif
subl $MCOUNT_INSN_SIZE, %eax
call prepare_ftrace_return
popl %edx
@ -234,11 +173,7 @@ END(ftrace_graph_caller)
return_to_handler:
pushl %eax
pushl %edx
#ifdef CC_USING_FENTRY
movl $0, %eax
#else
movl %ebp, %eax
#endif
call ftrace_return_to_handler
movl %eax, %ecx
popl %edx

28
arch/x86/kernel/ftrace_64.S
View File

@ -13,22 +13,12 @@
.code64
.section .entry.text, "ax"
#ifdef CC_USING_FENTRY
# define function_hook __fentry__
EXPORT_SYMBOL(__fentry__)
#else
# define function_hook mcount
EXPORT_SYMBOL(mcount)
#endif
#ifdef CONFIG_FRAME_POINTER
# ifdef CC_USING_FENTRY
/* Save parent and function stack frames (rip and rbp) */
# define MCOUNT_FRAME_SIZE (8+16*2)
# else
/* Save just function stack frame (rip and rbp) */
# define MCOUNT_FRAME_SIZE (8+16)
# endif
#else
/* No need to save a stack frame */
# define MCOUNT_FRAME_SIZE 0
@ -75,17 +65,13 @@ EXPORT_SYMBOL(mcount)
* fentry is called before the stack frame is set up, where as mcount
* is called afterward.
*/
#ifdef CC_USING_FENTRY
/* Save the parent pointer (skip orig rbp and our return address) */
pushq \added+8*2(%rsp)
pushq %rbp
movq %rsp, %rbp
/* Save the return address (now skip orig rbp, rbp and parent) */
pushq \added+8*3(%rsp)
#else
/* Can't assume that rip is before this (unless added was zero) */
pushq \added+8(%rsp)
#endif
pushq %rbp
movq %rsp, %rbp
#endif /* CONFIG_FRAME_POINTER */
@ -113,12 +99,7 @@ EXPORT_SYMBOL(mcount)
movq %rdx, RBP(%rsp)
/* Copy the parent address into %rsi (second parameter) */
#ifdef CC_USING_FENTRY
movq MCOUNT_REG_SIZE+8+\added(%rsp), %rsi
#else
/* %rdx contains original %rbp */
movq 8(%rdx), %rsi
#endif
/* Move RIP to its proper location */
movq MCOUNT_REG_SIZE+\added(%rsp), %rdi
@ -303,15 +284,8 @@ ENTRY(ftrace_graph_caller)
/* Saves rbp into %rdx and fills first parameter */
save_mcount_regs
#ifdef CC_USING_FENTRY
leaq MCOUNT_REG_SIZE+8(%rsp), %rsi
movq $0, %rdx /* No framepointers needed */
#else
/* Save address of the return address of traced function */
leaq 8(%rdx), %rsi
/* ftrace does sanity checks against frame pointers */
movq (%rdx), %rdx
#endif
call prepare_ftrace_return
restore_mcount_regs

35
include/linux/compiler.h
View File

@ -53,23 +53,24 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
* "Define 'is'", Bill Clinton
* "Define 'if'", Steven Rostedt
*/
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
#define __trace_if(cond) \
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
({ \
int ______r; \
static struct ftrace_branch_data \
__aligned(4) \
__section("_ftrace_branch") \
______f = { \
.func = __func__, \
.file = __FILE__, \
.line = __LINE__, \
}; \
______r = !!(cond); \
______r ? ______f.miss_hit[1]++ : ______f.miss_hit[0]++;\
______r; \
}))
#define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
#define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
#define __trace_if_value(cond) ({ \
static struct ftrace_branch_data \
__aligned(4) \
__section("_ftrace_branch") \
__if_trace = { \
.func = __func__, \
.file = __FILE__, \
.line = __LINE__, \
}; \
(cond) ? \
(__if_trace.miss_hit[1]++,1) : \
(__if_trace.miss_hit[0]++,0); \
})
#endif /* CONFIG_PROFILE_ALL_BRANCHES */
#else

2
include/linux/ftrace.h
View File

@ -741,6 +741,8 @@ struct ftrace_graph_ret {
typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
struct fgraph_ops {

15
include/linux/tracepoint.h
View File

@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
#define TRACE_EVENT_PERF_PERM(event, expr...)
#define DECLARE_EVENT_NOP(name, proto, args) \
static inline void trace_##name(proto) \
{ } \
static inline bool trace_##name##_enabled(void) \
{ \
return false; \
}
#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT_NOP(template, name, proto, args) \
DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
#endif /* ifdef TRACE_EVENT (see note above) */

8
include/trace/define_trace.h
View File

@ -46,6 +46,12 @@
assign, print, reg, unreg) \
DEFINE_TRACE_FN(name, reg, unreg)
#undef TRACE_EVENT_NOP
#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)
#undef DEFINE_EVENT_NOP
#define DEFINE_EVENT_NOP(template, name, proto, args)
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, name, proto, args) \
DEFINE_TRACE(name)
@ -102,6 +108,8 @@
#undef TRACE_EVENT_FN
#undef TRACE_EVENT_FN_COND
#undef TRACE_EVENT_CONDITION
#undef TRACE_EVENT_NOP
#undef DEFINE_EVENT_NOP
#undef DECLARE_EVENT_CLASS
#undef DEFINE_EVENT
#undef DEFINE_EVENT_FN

81
include/trace/events/rcu.h
View File

@ -7,6 +7,12 @@
#include <linux/tracepoint.h>
#ifdef CONFIG_RCU_TRACE
#define TRACE_EVENT_RCU TRACE_EVENT
#else
#define TRACE_EVENT_RCU TRACE_EVENT_NOP
#endif
/*
* Tracepoint for start/end markers used for utilization calculations.
* By convention, the string is of the following forms:
@ -35,8 +41,6 @@ TRACE_EVENT(rcu_utilization,
TP_printk("%s", __entry->s)
);
#ifdef CONFIG_RCU_TRACE
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
/*
@ -62,7 +66,7 @@ TRACE_EVENT(rcu_utilization,
* "end": End a grace period.
* "cpuend": CPU first notices a grace-period end.
*/
TRACE_EVENT(rcu_grace_period,
TRACE_EVENT_RCU(rcu_grace_period,
TP_PROTO(const char *rcuname, unsigned long gp_seq, const char *gpevent),
@ -101,7 +105,7 @@ TRACE_EVENT(rcu_grace_period,
* "Cleanup": Clean up rcu_node structure after previous GP.
* "CleanupMore": Clean up, and another GP is needed.
*/
TRACE_EVENT(rcu_future_grace_period,
TRACE_EVENT_RCU(rcu_future_grace_period,
TP_PROTO(const char *rcuname, unsigned long gp_seq,
unsigned long gp_seq_req, u8 level, int grplo, int grphi,
@ -141,7 +145,7 @@ TRACE_EVENT(rcu_future_grace_period,
* rcu_node structure, and the mask of CPUs that will be waited for.
* All but the type of RCU are extracted from the rcu_node structure.
*/
TRACE_EVENT(rcu_grace_period_init,
TRACE_EVENT_RCU(rcu_grace_period_init,
TP_PROTO(const char *rcuname, unsigned long gp_seq, u8 level,
int grplo, int grphi, unsigned long qsmask),
@ -186,7 +190,7 @@ TRACE_EVENT(rcu_grace_period_init,
* "endwake": Woke piggybackers up.
* "done": Someone else did the expedited grace period for us.
*/
TRACE_EVENT(rcu_exp_grace_period,
TRACE_EVENT_RCU(rcu_exp_grace_period,
TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
@ -218,7 +222,7 @@ TRACE_EVENT(rcu_exp_grace_period,
* "nxtlvl": Advance to next level of rcu_node funnel
* "wait": Wait for someone else to do expedited GP
*/
TRACE_EVENT(rcu_exp_funnel_lock,
TRACE_EVENT_RCU(rcu_exp_funnel_lock,
TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
const char *gpevent),
@ -269,7 +273,7 @@ TRACE_EVENT(rcu_exp_funnel_lock,
* "WaitQueue": Enqueue partially done, timed wait for it to complete.
* "WokeQueue": Partial enqueue now complete.
*/
TRACE_EVENT(rcu_nocb_wake,
TRACE_EVENT_RCU(rcu_nocb_wake,
TP_PROTO(const char *rcuname, int cpu, const char *reason),
@ -297,7 +301,7 @@ TRACE_EVENT(rcu_nocb_wake,
* include SRCU), the grace-period number that the task is blocking
* (the current or the next), and the task's PID.
*/
TRACE_EVENT(rcu_preempt_task,
TRACE_EVENT_RCU(rcu_preempt_task,
TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
@ -324,7 +328,7 @@ TRACE_EVENT(rcu_preempt_task,
* read-side critical section exiting that critical section. Track the
* type of RCU (which one day might include SRCU) and the task's PID.
*/
TRACE_EVENT(rcu_unlock_preempted_task,
TRACE_EVENT_RCU(rcu_unlock_preempted_task,
TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
@ -353,7 +357,7 @@ TRACE_EVENT(rcu_unlock_preempted_task,
* whether there are any blocked tasks blocking the current grace period.
* All but the type of RCU are extracted from the rcu_node structure.
*/
TRACE_EVENT(rcu_quiescent_state_report,
TRACE_EVENT_RCU(rcu_quiescent_state_report,
TP_PROTO(const char *rcuname, unsigned long gp_seq,
unsigned long mask, unsigned long qsmask,
@ -396,7 +400,7 @@ TRACE_EVENT(rcu_quiescent_state_report,
* state, which can be "dti" for dyntick-idle mode or "kick" when kicking
* a CPU that has been in dyntick-idle mode for too long.
*/
TRACE_EVENT(rcu_fqs,
TRACE_EVENT_RCU(rcu_fqs,
TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
@ -436,7 +440,7 @@ TRACE_EVENT(rcu_fqs,
* events use two separate counters, and that the "++=" and "--=" events
* for irq/NMI will change the counter by two, otherwise by one.
*/
TRACE_EVENT(rcu_dyntick,
TRACE_EVENT_RCU(rcu_dyntick,
TP_PROTO(const char *polarity, long oldnesting, long newnesting, atomic_t dynticks),
@ -468,7 +472,7 @@ TRACE_EVENT(rcu_dyntick,
* number of lazy callbacks queued, and the fourth element is the
* total number of callbacks queued.
*/
TRACE_EVENT(rcu_callback,
TRACE_EVENT_RCU(rcu_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
long qlen),
@ -504,7 +508,7 @@ TRACE_EVENT(rcu_callback,
* the fourth argument is the number of lazy callbacks queued, and the
* fifth argument is the total number of callbacks queued.
*/
TRACE_EVENT(rcu_kfree_callback,
TRACE_EVENT_RCU(rcu_kfree_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
long qlen_lazy, long qlen),
@ -539,7 +543,7 @@ TRACE_EVENT(rcu_kfree_callback,
* the total number of callbacks queued, and the fourth argument is
* the current RCU-callback batch limit.
*/
TRACE_EVENT(rcu_batch_start,
TRACE_EVENT_RCU(rcu_batch_start,
TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
@ -569,7 +573,7 @@ TRACE_EVENT(rcu_batch_start,
* The first argument is the type of RCU, and the second argument is
* a pointer to the RCU callback itself.
*/
TRACE_EVENT(rcu_invoke_callback,
TRACE_EVENT_RCU(rcu_invoke_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp),
@ -598,7 +602,7 @@ TRACE_EVENT(rcu_invoke_callback,
* is the offset of the callback within the enclosing RCU-protected
* data structure.
*/
TRACE_EVENT(rcu_invoke_kfree_callback,
TRACE_EVENT_RCU(rcu_invoke_kfree_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
@ -631,7 +635,7 @@ TRACE_EVENT(rcu_invoke_kfree_callback,
* and the sixth argument (risk) is the return value from
* rcu_is_callbacks_kthread().
*/
TRACE_EVENT(rcu_batch_end,
TRACE_EVENT_RCU(rcu_batch_end,
TP_PROTO(const char *rcuname, int callbacks_invoked,
char cb, char nr, char iit, char risk),
@ -673,7 +677,7 @@ TRACE_EVENT(rcu_batch_end,
* callback address can be NULL.
*/
#define RCUTORTURENAME_LEN 8
TRACE_EVENT(rcu_torture_read,
TRACE_EVENT_RCU(rcu_torture_read,
TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
unsigned long secs, unsigned long c_old, unsigned long c),
@ -721,7 +725,7 @@ TRACE_EVENT(rcu_torture_read,
* The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
* is the count of remaining callbacks, and "done" is the piggybacking count.
*/
TRACE_EVENT(rcu_barrier,
TRACE_EVENT_RCU(rcu_barrier,
TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
@ -748,41 +752,6 @@ TRACE_EVENT(rcu_barrier,
__entry->done)
);
#else /* #ifdef CONFIG_RCU_TRACE */
#define trace_rcu_grace_period(rcuname, gp_seq, gpevent) do { } while (0)
#define trace_rcu_future_grace_period(rcuname, gp_seq, gp_seq_req, \
level, grplo, grphi, event) \
do { } while (0)
#define trace_rcu_grace_period_init(rcuname, gp_seq, level, grplo, grphi, \
qsmask) do { } while (0)
#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
do { } while (0)
#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
do { } while (0)
#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
#define trace_rcu_preempt_task(rcuname, pid, gp_seq) do { } while (0)
#define trace_rcu_unlock_preempted_task(rcuname, gp_seq, pid) do { } while (0)
#define trace_rcu_quiescent_state_report(rcuname, gp_seq, mask, qsmask, level, \
grplo, grphi, gp_tasks) do { } \
while (0)
#define trace_rcu_fqs(rcuname, gp_seq, cpu, qsevent) do { } while (0)
#define trace_rcu_dyntick(polarity, oldnesting, newnesting, dyntick) do { } while (0)
#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
do { } while (0)
#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
do { } while (0)
#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
do { } while (0)
#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
#endif /* #else #ifdef CONFIG_RCU_TRACE */
#endif /* _TRACE_RCU_H */
/* This part must be outside protection */

21
include/trace/events/sched.h
View File

@ -241,7 +241,6 @@ DECLARE_EVENT_CLASS(sched_process_template,
DEFINE_EVENT(sched_process_template, sched_process_free,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
/*
* Tracepoint for a task exiting:
@ -336,11 +335,20 @@ TRACE_EVENT(sched_process_exec,
__entry->pid, __entry->old_pid)
);
#ifdef CONFIG_SCHEDSTATS
#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT
#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS
#else
#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT_NOP
#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS_NOP
#endif
/*
* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
* adding sched_stat support to SCHED_FIFO/RR would be welcome.
*/
DECLARE_EVENT_CLASS(sched_stat_template,
DECLARE_EVENT_CLASS_SCHEDSTAT(sched_stat_template,
TP_PROTO(struct task_struct *tsk, u64 delay),
@ -363,12 +371,11 @@ DECLARE_EVENT_CLASS(sched_stat_template,
(unsigned long long)__entry->delay)
);
/*
* Tracepoint for accounting wait time (time the task is runnable
* but not actually running due to scheduler contention).
*/
DEFINE_EVENT(sched_stat_template, sched_stat_wait,
DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_wait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
@ -376,7 +383,7 @@ DEFINE_EVENT(sched_stat_template, sched_stat_wait,
* Tracepoint for accounting sleep time (time the task is not runnable,
* including iowait, see below).
*/
DEFINE_EVENT(sched_stat_template, sched_stat_sleep,
DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_sleep,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
@ -384,14 +391,14 @@ DEFINE_EVENT(sched_stat_template, sched_stat_sleep,
* Tracepoint for accounting iowait time (time the task is not runnable
* due to waiting on IO to complete).
*/
DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_iowait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
/*
* Tracepoint for accounting blocked time (time the task is in uninterruptible).
*/
DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_blocked,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));

8
kernel/livepatch/core.c
View File

@ -1208,14 +1208,6 @@ void klp_module_going(struct module *mod)
static int __init klp_init(void)
{
int ret;
ret = klp_check_compiler_support();
if (ret) {
pr_info("Your compiler is too old; turning off.\n");
return -EINVAL;
}
klp_root_kobj = kobject_create_and_add("livepatch", kernel_kobj);
if (!klp_root_kobj)
return -ENOMEM;

9
kernel/rcu/rcu.h
View File

@ -11,11 +11,6 @@
#define __LINUX_RCU_H
#include <trace/events/rcu.h>
#ifdef CONFIG_RCU_TRACE
#define RCU_TRACE(stmt) stmt
#else /* #ifdef CONFIG_RCU_TRACE */
#define RCU_TRACE(stmt)
#endif /* #else #ifdef CONFIG_RCU_TRACE */
/* Offset to allow distinguishing irq vs. task-based idle entry/exit. */
#define DYNTICK_IRQ_NONIDLE ((LONG_MAX / 2) + 1)
@ -216,12 +211,12 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
rcu_lock_acquire(&rcu_callback_map);
if (__is_kfree_rcu_offset(offset)) {
RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset);)
trace_rcu_invoke_kfree_callback(rn, head, offset);
kfree((void *)head - offset);
rcu_lock_release(&rcu_callback_map);
return true;
} else {
RCU_TRACE(trace_rcu_invoke_callback(rn, head);)
trace_rcu_invoke_callback(rn, head);
f = head->func;
WRITE_ONCE(head->func, (rcu_callback_t)0L);
f(head);

8
kernel/rcu/tree.c
View File

@ -1969,14 +1969,14 @@ rcu_check_quiescent_state(struct rcu_data *rdp)
*/
int rcutree_dying_cpu(unsigned int cpu)
{
RCU_TRACE(bool blkd;)
RCU_TRACE(struct rcu_data *rdp = this_cpu_ptr(&rcu_data);)
RCU_TRACE(struct rcu_node *rnp = rdp->mynode;)
bool blkd;
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
struct rcu_node *rnp = rdp->mynode;
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return 0;
RCU_TRACE(blkd = !!(rnp->qsmask & rdp->grpmask);)
blkd = !!(rnp->qsmask & rdp->grpmask);
trace_rcu_grace_period(rcu_state.name, rnp->gp_seq,
blkd ? TPS("cpuofl") : TPS("cpuofl-bgp"));
return 0;

9
kernel/trace/ftrace.c
View File

@ -70,12 +70,8 @@
#define INIT_OPS_HASH(opsname) \
.func_hash = &opsname.local_hash, \
.local_hash.regex_lock = __MUTEX_INITIALIZER(opsname.local_hash.regex_lock),
#define ASSIGN_OPS_HASH(opsname, val) \
.func_hash = val, \
.local_hash.regex_lock = __MUTEX_INITIALIZER(opsname.local_hash.regex_lock),
#else
#define INIT_OPS_HASH(opsname)
#define ASSIGN_OPS_HASH(opsname, val)
#endif
enum {
@ -3880,7 +3876,7 @@ static int ftrace_hash_move_and_update_ops(struct ftrace_ops *ops,
static bool module_exists(const char *module)
{
/* All modules have the symbol __this_module */
const char this_mod[] = "__this_module";
static const char this_mod[] = "__this_module";
char modname[MAX_PARAM_PREFIX_LEN + sizeof(this_mod) + 2];
unsigned long val;
int n;
@ -6265,6 +6261,9 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
preempt_disable_notrace();
do_for_each_ftrace_op(op, ftrace_ops_list) {
/* Stub functions don't need to be called nor tested */
if (op->flags & FTRACE_OPS_FL_STUB)
continue;
/*
* Check the following for each ops before calling their func:
* if RCU flag is set, then rcu_is_watching() must be true

2
kernel/trace/ring_buffer.c
View File

@ -4979,7 +4979,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
cnt = data->cnt + (nested ? 27 : 0);
/* Multiply cnt by ~e, to make some unique increment */
size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1);
size = (cnt * 68 / 25) % (sizeof(rb_string) - 1);
len = size + sizeof(struct rb_item);

2
kernel/trace/ring_buffer_benchmark.c
View File

@ -362,7 +362,7 @@ static void ring_buffer_producer(void)
hit--; /* make it non zero */
}
/* Caculate the average time in nanosecs */
/* Calculate the average time in nanosecs */
avg = NSEC_PER_MSEC / (hit + missed);
trace_printk("%ld ns per entry\n", avg);
}

417
kernel/trace/trace.c
View File

@ -1727,6 +1727,10 @@ static __init int init_trace_selftests(void)
pr_info("Running postponed tracer tests:\n");
list_for_each_entry_safe(p, n, &postponed_selftests, list) {
/* This loop can take minutes when sanitizers are enabled, so
* lets make sure we allow RCU processing.
*/
cond_resched();
ret = run_tracer_selftest(p->type);
/* If the test fails, then warn and remove from available_tracers */
if (ret < 0) {
@ -3045,6 +3049,7 @@ void trace_printk_init_buffers(void)
if (global_trace.trace_buffer.buffer)
tracing_start_cmdline_record();
}
EXPORT_SYMBOL_GPL(trace_printk_init_buffers);
void trace_printk_start_comm(void)
{
@ -3205,6 +3210,7 @@ int trace_array_printk(struct trace_array *tr,
va_end(ap);
return ret;
}
EXPORT_SYMBOL_GPL(trace_array_printk);
__printf(3, 4)
int trace_array_printk_buf(struct ring_buffer *buffer,
@ -3482,34 +3488,69 @@ static void s_stop(struct seq_file *m, void *p)
trace_event_read_unlock();
}
static void
get_total_entries_cpu(struct trace_buffer *buf, unsigned long *total,
unsigned long *entries, int cpu)
{
unsigned long count;
count = ring_buffer_entries_cpu(buf->buffer, cpu);
/*
* If this buffer has skipped entries, then we hold all
* entries for the trace and we need to ignore the
* ones before the time stamp.
*/
if (per_cpu_ptr(buf->data, cpu)->skipped_entries) {
count -= per_cpu_ptr(buf->data, cpu)->skipped_entries;
/* total is the same as the entries */
*total = count;
} else
*total = count +
ring_buffer_overrun_cpu(buf->buffer, cpu);
*entries = count;
}
static void
get_total_entries(struct trace_buffer *buf,
unsigned long *total, unsigned long *entries)
{
unsigned long count;
unsigned long t, e;
int cpu;
*total = 0;
*entries = 0;
for_each_tracing_cpu(cpu) {
count = ring_buffer_entries_cpu(buf->buffer, cpu);
/*
* If this buffer has skipped entries, then we hold all
* entries for the trace and we need to ignore the
* ones before the time stamp.
*/
if (per_cpu_ptr(buf->data, cpu)->skipped_entries) {
count -= per_cpu_ptr(buf->data, cpu)->skipped_entries;
/* total is the same as the entries */
*total += count;
} else
*total += count +
ring_buffer_overrun_cpu(buf->buffer, cpu);
*entries += count;
get_total_entries_cpu(buf, &t, &e, cpu);
*total += t;
*entries += e;
}
}
unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu)
{
unsigned long total, entries;
if (!tr)
tr = &global_trace;
get_total_entries_cpu(&tr->trace_buffer, &total, &entries, cpu);
return entries;
}
unsigned long trace_total_entries(struct trace_array *tr)
{
unsigned long total, entries;
if (!tr)
tr = &global_trace;
get_total_entries(&tr->trace_buffer, &total, &entries);
return entries;
}
static void print_lat_help_header(struct seq_file *m)
{
seq_puts(m, "# _------=> CPU# \n"
@ -3548,25 +3589,18 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
unsigned int flags)
{
bool tgid = flags & TRACE_ITER_RECORD_TGID;
const char tgid_space[] = " ";
const char space[] = " ";
const char *space = " ";
int prec = tgid ? 10 : 2;
print_event_info(buf, m);
seq_printf(m, "# %s _-----=> irqs-off\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s / _----=> need-resched\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s| / _---=> hardirq/softirq\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s|| / _--=> preempt-depth\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s||| / delay\n",
tgid ? tgid_space : space);
seq_printf(m, "# TASK-PID %sCPU# |||| TIMESTAMP FUNCTION\n",
tgid ? " TGID " : space);
seq_printf(m, "# | | %s | |||| | |\n",
tgid ? " | " : space);
seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space);
seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space);
seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space);
seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space);
seq_printf(m, "# %.*s||| / delay\n", prec, space);
seq_printf(m, "# TASK-PID %.*sCPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID ");
seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | ");
}
void
@ -4692,6 +4726,7 @@ static const char readme_msg[] =
" trace_pipe\t\t- A consuming read to see the contents of the buffer\n"
" current_tracer\t- function and latency tracers\n"
" available_tracers\t- list of configured tracers for current_tracer\n"
" error_log\t- error log for failed commands (that support it)\n"
" buffer_size_kb\t- view and modify size of per cpu buffer\n"
" buffer_total_size_kb - view total size of all cpu buffers\n\n"
" trace_clock\t\t-change the clock used to order events\n"
@ -4712,7 +4747,7 @@ static const char readme_msg[] =
" instances\t\t- Make sub-buffers with: mkdir instances/foo\n"
"\t\t\t Remove sub-buffer with rmdir\n"
" trace_options\t\t- Set format or modify how tracing happens\n"
"\t\t\t Disable an option by adding a suffix 'no' to the\n"
"\t\t\t Disable an option by prefixing 'no' to the\n"
"\t\t\t option name\n"
" saved_cmdlines_size\t- echo command number in here to store comm-pid list\n"
#ifdef CONFIG_DYNAMIC_FTRACE
@ -6296,13 +6331,13 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
struct ring_buffer *buffer;
struct print_entry *entry;
unsigned long irq_flags;
const char faulted[] = "<faulted>";
ssize_t written;
int size;
int len;
/* Used in tracing_mark_raw_write() as well */
#define FAULTED_SIZE (sizeof(faulted) - 1) /* '\0' is already accounted for */
#define FAULTED_STR "<faulted>"
#define FAULTED_SIZE (sizeof(FAULTED_STR) - 1) /* '\0' is already accounted for */
if (tracing_disabled)
return -EINVAL;
@ -6334,7 +6369,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt);
if (len) {
memcpy(&entry->buf, faulted, FAULTED_SIZE);
memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE);
cnt = FAULTED_SIZE;
written = -EFAULT;
} else
@ -6375,7 +6410,6 @@ tracing_mark_raw_write(struct file *filp, const char __user *ubuf,
struct ring_buffer_event *event;
struct ring_buffer *buffer;
struct raw_data_entry *entry;
const char faulted[] = "<faulted>";
unsigned long irq_flags;
ssize_t written;
int size;
@ -6415,7 +6449,7 @@ tracing_mark_raw_write(struct file *filp, const char __user *ubuf,
len = __copy_from_user_inatomic(&entry->id, ubuf, cnt);
if (len) {
entry->id = -1;
memcpy(&entry->buf, faulted, FAULTED_SIZE);
memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE);
written = -EFAULT;
} else
written = cnt;
@ -6868,6 +6902,238 @@ static const struct file_operations snapshot_raw_fops = {
#endif /* CONFIG_TRACER_SNAPSHOT */
#define TRACING_LOG_ERRS_MAX 8
#define TRACING_LOG_LOC_MAX 128
#define CMD_PREFIX " Command: "
struct err_info {
const char **errs; /* ptr to loc-specific array of err strings */
u8 type; /* index into errs -> specific err string */
u8 pos; /* MAX_FILTER_STR_VAL = 256 */
u64 ts;
};
struct tracing_log_err {
struct list_head list;
struct err_info info;
char loc[TRACING_LOG_LOC_MAX]; /* err location */
char cmd[MAX_FILTER_STR_VAL]; /* what caused err */
};
static DEFINE_MUTEX(tracing_err_log_lock);
struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)
{
struct tracing_log_err *err;
if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) {
err = kzalloc(sizeof(*err), GFP_KERNEL);
if (!err)
err = ERR_PTR(-ENOMEM);
tr->n_err_log_entries++;
return err;
}
err = list_first_entry(&tr->err_log, struct tracing_log_err, list);
list_del(&err->list);
return err;
}
/**
* err_pos - find the position of a string within a command for error careting
* @cmd: The tracing command that caused the error
* @str: The string to position the caret at within @cmd
*
* Finds the position of the first occurence of @str within @cmd. The
* return value can be passed to tracing_log_err() for caret placement
* within @cmd.
*
* Returns the index within @cmd of the first occurence of @str or 0
* if @str was not found.
*/
unsigned int err_pos(char *cmd, const char *str)
{
char *found;
if (WARN_ON(!strlen(cmd)))
return 0;
found = strstr(cmd, str);
if (found)
return found - cmd;
return 0;
}
/**
* tracing_log_err - write an error to the tracing error log
* @tr: The associated trace array for the error (NULL for top level array)
* @loc: A string describing where the error occurred
* @cmd: The tracing command that caused the error
* @errs: The array of loc-specific static error strings
* @type: The index into errs[], which produces the specific static err string
* @pos: The position the caret should be placed in the cmd
*
* Writes an error into tracing/error_log of the form:
*
* <loc>: error: <text>
* Command: <cmd>
* ^
*
* tracing/error_log is a small log file containing the last
* TRACING_LOG_ERRS_MAX errors (8). Memory for errors isn't allocated
* unless there has been a tracing error, and the error log can be
* cleared and have its memory freed by writing the empty string in
* truncation mode to it i.e. echo > tracing/error_log.
*
* NOTE: the @errs array along with the @type param are used to
* produce a static error string - this string is not copied and saved
* when the error is logged - only a pointer to it is saved. See
* existing callers for examples of how static strings are typically
* defined for use with tracing_log_err().
*/
void tracing_log_err(struct trace_array *tr,
const char *loc, const char *cmd,
const char **errs, u8 type, u8 pos)
{
struct tracing_log_err *err;
if (!tr)
tr = &global_trace;
mutex_lock(&tracing_err_log_lock);
err = get_tracing_log_err(tr);
if (PTR_ERR(err) == -ENOMEM) {
mutex_unlock(&tracing_err_log_lock);
return;
}
snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc);
snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd);
err->info.errs = errs;
err->info.type = type;
err->info.pos = pos;
err->info.ts = local_clock();
list_add_tail(&err->list, &tr->err_log);
mutex_unlock(&tracing_err_log_lock);
}
static void clear_tracing_err_log(struct trace_array *tr)
{
struct tracing_log_err *err, *next;
mutex_lock(&tracing_err_log_lock);
list_for_each_entry_safe(err, next, &tr->err_log, list) {
list_del(&err->list);
kfree(err);
}
tr->n_err_log_entries = 0;
mutex_unlock(&tracing_err_log_lock);
}
static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos)
{
struct trace_array *tr = m->private;
mutex_lock(&tracing_err_log_lock);
return seq_list_start(&tr->err_log, *pos);
}
static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
struct trace_array *tr = m->private;
return seq_list_next(v, &tr->err_log, pos);
}
static void tracing_err_log_seq_stop(struct seq_file *m, void *v)
{
mutex_unlock(&tracing_err_log_lock);
}
static void tracing_err_log_show_pos(struct seq_file *m, u8 pos)
{
u8 i;
for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++)
seq_putc(m, ' ');
for (i = 0; i < pos; i++)
seq_putc(m, ' ');
seq_puts(m, "^\n");
}
static int tracing_err_log_seq_show(struct seq_file *m, void *v)
{
struct tracing_log_err *err = v;
if (err) {
const char *err_text = err->info.errs[err->info.type];
u64 sec = err->info.ts;
u32 nsec;
nsec = do_div(sec, NSEC_PER_SEC);
seq_printf(m, "[%5llu.%06u] %s%s", sec, nsec / 1000,
err->loc, err_text);
seq_printf(m, "%s", err->cmd);
tracing_err_log_show_pos(m, err->info.pos);
}
return 0;
}
static const struct seq_operations tracing_err_log_seq_ops = {
.start = tracing_err_log_seq_start,
.next = tracing_err_log_seq_next,
.stop = tracing_err_log_seq_stop,
.show = tracing_err_log_seq_show
};
static int tracing_err_log_open(struct inode *inode, struct file *file)
{
struct trace_array *tr = inode->i_private;
int ret = 0;
if (trace_array_get(tr) < 0)
return -ENODEV;
/* If this file was opened for write, then erase contents */
if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC))
clear_tracing_err_log(tr);
if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &tracing_err_log_seq_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = tr;
} else {
trace_array_put(tr);
}
}
return ret;
}
static ssize_t tracing_err_log_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *ppos)
{
return count;
}
static const struct file_operations tracing_err_log_fops = {
.open = tracing_err_log_open,
.write = tracing_err_log_write,
.read = seq_read,
.llseek = seq_lseek,
.release = tracing_release_generic_tr,
};
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
struct trace_array *tr = inode->i_private;
@ -8033,7 +8299,7 @@ static void update_tracer_options(struct trace_array *tr)
mutex_unlock(&trace_types_lock);
}
static int instance_mkdir(const char *name)
struct trace_array *trace_array_create(const char *name)
{
struct trace_array *tr;
int ret;
@ -8072,6 +8338,7 @@ static int instance_mkdir(const char *name)
INIT_LIST_HEAD(&tr->systems);
INIT_LIST_HEAD(&tr->events);
INIT_LIST_HEAD(&tr->hist_vars);
INIT_LIST_HEAD(&tr->err_log);
if (allocate_trace_buffers(tr, trace_buf_size) < 0)
goto out_free_tr;
@ -8097,7 +8364,7 @@ static int instance_mkdir(const char *name)
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
return 0;
return tr;
out_free_tr:
free_trace_buffers(tr);
@ -8109,33 +8376,21 @@ static int instance_mkdir(const char *name)
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
return ret;
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(trace_array_create);
static int instance_mkdir(const char *name)
{
return PTR_ERR_OR_ZERO(trace_array_create(name));
}
static int instance_rmdir(const char *name)
static int __remove_instance(struct trace_array *tr)
{
struct trace_array *tr;
int found = 0;
int ret;
int i;
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
ret = -ENODEV;
list_for_each_entry(tr, &ftrace_trace_arrays, list) {
if (tr->name && strcmp(tr->name, name) == 0) {
found = 1;
break;
}
}
if (!found)
goto out_unlock;
ret = -EBUSY;
if (tr->ref || (tr->current_trace && tr->current_trace->ref))
goto out_unlock;
return -EBUSY;
list_del(&tr->list);
@ -8161,10 +8416,46 @@ static int instance_rmdir(const char *name)
free_cpumask_var(tr->tracing_cpumask);
kfree(tr->name);
kfree(tr);
tr = NULL;
ret = 0;
return 0;
}
int trace_array_destroy(struct trace_array *tr)
{
int ret;
if (!tr)
return -EINVAL;
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
ret = __remove_instance(tr);
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(trace_array_destroy);
static int instance_rmdir(const char *name)
{
struct trace_array *tr;
int ret;
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
ret = -ENODEV;
list_for_each_entry(tr, &ftrace_trace_arrays, list) {
if (tr->name && strcmp(tr->name, name) == 0) {
ret = __remove_instance(tr);
break;
}
}
out_unlock:
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
@ -8254,6 +8545,9 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
tr, &snapshot_fops);
#endif
trace_create_file("error_log", 0644, d_tracer,
tr, &tracing_err_log_fops);
for_each_tracing_cpu(cpu)
tracing_init_tracefs_percpu(tr, cpu);
@ -8839,6 +9133,7 @@ __init static int tracer_alloc_buffers(void)
INIT_LIST_HEAD(&global_trace.systems);
INIT_LIST_HEAD(&global_trace.events);
INIT_LIST_HEAD(&global_trace.hist_vars);
INIT_LIST_HEAD(&global_trace.err_log);
list_add(&global_trace.list, &ftrace_trace_arrays);
apply_trace_boot_options();

13
kernel/trace/trace.h
View File

@ -293,11 +293,13 @@ struct trace_array {
int nr_topts;
bool clear_trace;
int buffer_percent;
unsigned int n_err_log_entries;
struct tracer *current_trace;
unsigned int trace_flags;
unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
unsigned int flags;
raw_spinlock_t start_lock;
struct list_head err_log;
struct dentry *dir;
struct dentry *options;
struct dentry *percpu_dir;
@ -719,6 +721,9 @@ void trace_init_global_iter(struct trace_iterator *iter);
void tracing_iter_reset(struct trace_iterator *iter, int cpu);
unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
unsigned long trace_total_entries(struct trace_array *tr);
void trace_function(struct trace_array *tr,
unsigned long ip,
unsigned long parent_ip,
@ -1545,7 +1550,8 @@ extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
extern void print_subsystem_event_filter(struct event_subsystem *system,
struct trace_seq *s);
extern int filter_assign_type(const char *type);
extern int create_event_filter(struct trace_event_call *call,
extern int create_event_filter(struct trace_array *tr,
struct trace_event_call *call,
char *filter_str, bool set_str,
struct event_filter **filterp);
extern void free_event_filter(struct event_filter *filter);
@ -1876,6 +1882,11 @@ extern ssize_t trace_parse_run_command(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos,
int (*createfn)(int, char**));
extern unsigned int err_pos(char *cmd, const char *str);
extern void tracing_log_err(struct trace_array *tr,
const char *loc, const char *cmd,
const char **errs, u8 type, u8 pos);
/*
* Normal trace_printk() and friends allocates special buffers
* to do the manipulation, as well as saves the print formats

4
kernel/trace/trace_events.c
View File

@ -832,6 +832,7 @@ static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set)
return ret;
}
EXPORT_SYMBOL_GPL(ftrace_set_clr_event);
/**
* trace_set_clr_event - enable or disable an event
@ -1318,9 +1319,6 @@ event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
char buf[32];
int len;
if (*ppos)
return 0;
if (unlikely(!id))
return -ENODEV;

80
kernel/trace/trace_events_filter.c
View File

@ -66,7 +66,8 @@ static const char * ops[] = { OPS };
C(INVALID_FILTER, "Meaningless filter expression"), \
C(IP_FIELD_ONLY, "Only 'ip' field is supported for function trace"), \
C(INVALID_VALUE, "Invalid value (did you forget quotes)?"), \
C(NO_FILTER, "No filter found"),
C(ERRNO, "Error"), \
C(NO_FILTER, "No filter found")
#undef C
#define C(a, b) FILT_ERR_##a
@ -76,7 +77,7 @@ enum { ERRORS };
#undef C
#define C(a, b) b
static char *err_text[] = { ERRORS };
static const char *err_text[] = { ERRORS };
/* Called after a '!' character but "!=" and "!~" are not "not"s */
static bool is_not(const char *str)
@ -919,7 +920,8 @@ static void remove_filter_string(struct event_filter *filter)
filter->filter_string = NULL;
}
static void append_filter_err(struct filter_parse_error *pe,
static void append_filter_err(struct trace_array *tr,
struct filter_parse_error *pe,
struct event_filter *filter)
{
struct trace_seq *s;
@ -947,8 +949,14 @@ static void append_filter_err(struct filter_parse_error *pe,
if (pe->lasterr > 0) {
trace_seq_printf(s, "\n%*s", pos, "^");
trace_seq_printf(s, "\nparse_error: %s\n", err_text[pe->lasterr]);
tracing_log_err(tr, "event filter parse error",
filter->filter_string, err_text,
pe->lasterr, pe->lasterr_pos);
} else {
trace_seq_printf(s, "\nError: (%d)\n", pe->lasterr);
tracing_log_err(tr, "event filter parse error",
filter->filter_string, err_text,
FILT_ERR_ERRNO, 0);
}
trace_seq_putc(s, 0);
buf = kmemdup_nul(s->buffer, s->seq.len, GFP_KERNEL);
@ -1214,30 +1222,30 @@ static int parse_pred(const char *str, void *data,
* (perf doesn't use it) and grab everything.
*/
if (strcmp(field->name, "ip") != 0) {
parse_error(pe, FILT_ERR_IP_FIELD_ONLY, pos + i);
goto err_free;
}
pred->fn = filter_pred_none;
parse_error(pe, FILT_ERR_IP_FIELD_ONLY, pos + i);
goto err_free;
}
pred->fn = filter_pred_none;
/*
* Quotes are not required, but if they exist then we need
* to read them till we hit a matching one.
*/
if (str[i] == '\'' || str[i] == '"')
q = str[i];
else
q = 0;
/*
* Quotes are not required, but if they exist then we need
* to read them till we hit a matching one.
*/
if (str[i] == '\'' || str[i] == '"')
q = str[i];
else
q = 0;
for (i++; str[i]; i++) {
if (q && str[i] == q)
break;
if (!q && (str[i] == ')' || str[i] == '&' ||
str[i] == '|'))
break;
}
/* Skip quotes */
if (q)
s++;
for (i++; str[i]; i++) {
if (q && str[i] == q)
break;
if (!q && (str[i] == ')' || str[i] == '&' ||
str[i] == '|'))
break;
}
/* Skip quotes */
if (q)
s++;
len = i - s;
if (len >= MAX_FILTER_STR_VAL) {
parse_error(pe, FILT_ERR_OPERAND_TOO_LONG, pos + i);
@ -1600,7 +1608,7 @@ static int process_system_preds(struct trace_subsystem_dir *dir,
if (err) {
filter_disable(file);
parse_error(pe, FILT_ERR_BAD_SUBSYS_FILTER, 0);
append_filter_err(pe, filter);
append_filter_err(tr, pe, filter);
} else
event_set_filtered_flag(file);
@ -1712,7 +1720,8 @@ static void create_filter_finish(struct filter_parse_error *pe)
* information if @set_str is %true and the caller is responsible for
* freeing it.
*/
static int create_filter(struct trace_event_call *call,
static int create_filter(struct trace_array *tr,
struct trace_event_call *call,
char *filter_string, bool set_str,
struct event_filter **filterp)
{
@ -1729,17 +1738,18 @@ static int create_filter(struct trace_event_call *call,
err = process_preds(call, filter_string, *filterp, pe);
if (err && set_str)
append_filter_err(pe, *filterp);
append_filter_err(tr, pe, *filterp);
create_filter_finish(pe);
return err;
}
int create_event_filter(struct trace_event_call *call,
int create_event_filter(struct trace_array *tr,
struct trace_event_call *call,
char *filter_str, bool set_str,
struct event_filter **filterp)
{
return create_filter(call, filter_str, set_str, filterp);
return create_filter(tr, call, filter_str, set_str, filterp);
}
/**
@ -1766,7 +1776,7 @@ static int create_system_filter(struct trace_subsystem_dir *dir,
kfree((*filterp)->filter_string);
(*filterp)->filter_string = NULL;
} else {
append_filter_err(pe, *filterp);
append_filter_err(tr, pe, *filterp);
}
}
create_filter_finish(pe);
@ -1797,7 +1807,7 @@ int apply_event_filter(struct trace_event_file *file, char *filter_string)
return 0;
}
err = create_filter(call, filter_string, true, &filter);
err = create_filter(file->tr, call, filter_string, true, &filter);
/*
* Always swap the call filter with the new filter
@ -2053,7 +2063,7 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
if (event->filter)
goto out_unlock;
err = create_filter(call, filter_str, false, &filter);
err = create_filter(NULL, call, filter_str, false, &filter);
if (err)
goto free_filter;
@ -2202,8 +2212,8 @@ static __init int ftrace_test_event_filter(void)
struct test_filter_data_t *d = &test_filter_data[i];
int err;
err = create_filter(&event_ftrace_test_filter, d->filter,
false, &filter);
err = create_filter(NULL, &event_ftrace_test_filter,
d->filter, false, &filter);
if (err) {
printk(KERN_INFO
"Failed to get filter for '%s', err %d\n",

268
kernel/trace/trace_events_hist.c
View File

@ -22,6 +22,57 @@
#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
#define ERRORS \
C(NONE, "No error"), \
C(DUPLICATE_VAR, "Variable already defined"), \
C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
C(TOO_MANY_VARS, "Too many variables defined"), \
C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
C(TRIGGER_EEXIST, "Hist trigger already exists"), \
C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
C(HIST_NOT_FOUND, "Matching event histogram not found"), \
C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
C(TOO_MANY_PARAMS, "Too many action params"), \
C(PARAM_NOT_FOUND, "Couldn't find param"), \
C(INVALID_PARAM, "Invalid action param"), \
C(ACTION_NOT_FOUND, "No action found"), \
C(NO_SAVE_PARAMS, "No params found for save()"), \
C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
C(ACTION_MISMATCH, "Handler doesn't support action"), \
C(NO_CLOSING_PAREN, "No closing paren found"), \
C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
C(INVALID_REF_KEY, "Using variable references as keys not supported"), \
C(VAR_NOT_FOUND, "Couldn't find variable"), \
C(FIELD_NOT_FOUND, "Couldn't find field"),
#undef C
#define C(a, b) HIST_ERR_##a
enum { ERRORS };
#undef C
#define C(a, b) b
static const char *err_text[] = { ERRORS };
struct hist_field;
typedef u64 (*hist_field_fn_t) (struct hist_field *field,
@ -535,62 +586,49 @@ static struct track_data *track_data_alloc(unsigned int key_len,
return data;
}
static char last_hist_cmd[MAX_FILTER_STR_VAL];
static char hist_err_str[MAX_FILTER_STR_VAL];
static char last_cmd[MAX_FILTER_STR_VAL];
static char last_cmd_loc[MAX_FILTER_STR_VAL];
static void last_cmd_set(char *str)
static int errpos(char *str)
{
if (!str)
return;
strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
return err_pos(last_cmd, str);
}
static void hist_err(char *str, char *var)
static void last_cmd_set(struct trace_event_file *file, char *str)
{
int maxlen = MAX_FILTER_STR_VAL - 1;
const char *system = NULL, *name = NULL;
struct trace_event_call *call;
if (!str)
return;
if (strlen(hist_err_str))
return;
strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
if (!var)
var = "";
if (file) {
call = file->event_call;
if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
return;
system = call->class->system;
if (system) {
name = trace_event_name(call);
if (!name)
system = NULL;
}
}
strcat(hist_err_str, str);
strcat(hist_err_str, var);
if (system)
snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
}
static void hist_err_event(char *str, char *system, char *event, char *var)
static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
{
char err[MAX_FILTER_STR_VAL];
if (system && var)
snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var);
else if (system)
snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
else
strscpy(err, var, MAX_FILTER_STR_VAL);
hist_err(str, err);
tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
err_type, err_pos);
}
static void hist_err_clear(void)
{
hist_err_str[0] = '\0';
}
static bool have_hist_err(void)
{
if (strlen(hist_err_str))
return true;
return false;
last_cmd[0] = '\0';
last_cmd_loc[0] = '\0';
}
struct synth_trace_event {
@ -1719,7 +1757,7 @@ static struct trace_event_file *find_var_file(struct trace_array *tr,
if (find_var_field(var_hist_data, var_name)) {
if (found) {
hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
return NULL;
}
@ -1770,7 +1808,8 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name)
hist_field = find_file_var(file, var_name);
if (hist_field) {
if (found) {
hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
errpos(var_name));
return ERR_PTR(-EINVAL);
}
@ -2002,11 +2041,11 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs)
attrs->n_actions++;
ret = 0;
}
return ret;
}
static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
static int parse_assignment(struct trace_array *tr,
char *str, struct hist_trigger_attrs *attrs)
{
int ret = 0;
@ -2062,7 +2101,7 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
char *assignment;
if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
hist_err("Too many variables defined: ", str);
hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
ret = -EINVAL;
goto out;
}
@ -2079,7 +2118,8 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
return ret;
}
static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
static struct hist_trigger_attrs *
parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
{
struct hist_trigger_attrs *attrs;
int ret = 0;
@ -2092,7 +2132,7 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
char *str = strsep(&trigger_str, ":");
if (strchr(str, '=')) {
ret = parse_assignment(str, attrs);
ret = parse_assignment(tr, str, attrs);
if (ret)
goto free;
} else if (strcmp(str, "pause") == 0)
@ -2648,6 +2688,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
char *var_name)
{
struct hist_field *var_field = NULL, *ref_field = NULL;
struct trace_array *tr = hist_data->event_file->tr;
if (!is_var_ref(var_name))
return NULL;
@ -2660,8 +2701,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
system, event_name);
if (!ref_field)
hist_err_event("Couldn't find variable: $",
system, event_name, var_name);
hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
return ref_field;
}
@ -2672,6 +2712,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
{
struct ftrace_event_field *field = NULL;
char *field_name, *modifier, *str;
struct trace_array *tr = file->tr;
modifier = str = kstrdup(field_str, GFP_KERNEL);
if (!modifier)
@ -2695,7 +2736,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
else {
hist_err("Invalid field modifier: ", modifier);
hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
field = ERR_PTR(-EINVAL);
goto out;
}
@ -2711,7 +2752,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else {
field = trace_find_event_field(file->event_call, field_name);
if (!field || !field->size) {
hist_err("Couldn't find field: ", field_name);
hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
field = ERR_PTR(-EINVAL);
goto out;
}
@ -2773,7 +2814,8 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
if (!s) {
hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var);
hist_field = parse_var_ref(hist_data, ref_system,
ref_event, ref_var);
if (hist_field) {
if (var_name) {
hist_field = create_alias(hist_data, hist_field, var_name);
@ -2822,7 +2864,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
/* we support only -(xxx) i.e. explicit parens required */
if (level > 3) {
hist_err("Too many subexpressions (3 max): ", str);
hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
ret = -EINVAL;
goto free;
}
@ -2877,7 +2919,8 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
return ERR_PTR(ret);
}
static int check_expr_operands(struct hist_field *operand1,
static int check_expr_operands(struct trace_array *tr,
struct hist_field *operand1,
struct hist_field *operand2)
{
unsigned long operand1_flags = operand1->flags;
@ -2905,7 +2948,7 @@ static int check_expr_operands(struct hist_field *operand1,
if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
(operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
hist_err("Timestamp units in expression don't match", NULL);
hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
return -EINVAL;
}
@ -2923,7 +2966,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
char *sep, *operand1_str;
if (level > 3) {
hist_err("Too many subexpressions (3 max): ", str);
hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
return ERR_PTR(-EINVAL);
}
@ -2968,7 +3011,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
goto free;
}
ret = check_expr_operands(operand1, operand2);
ret = check_expr_operands(file->tr, operand1, operand2);
if (ret)
goto free;
@ -3161,16 +3204,14 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
int ret;
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
hist_err_event("trace action: Too many field variables defined: ",
subsys_name, event_name, field_name);
hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
return ERR_PTR(-EINVAL);
}
file = event_file(tr, subsys_name, event_name);
if (IS_ERR(file)) {
hist_err_event("trace action: Event file not found: ",
subsys_name, event_name, field_name);
hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
ret = PTR_ERR(file);
return ERR_PTR(ret);
}
@ -3183,8 +3224,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
*/
hist_data = find_compatible_hist(target_hist_data, file);
if (!hist_data) {
hist_err_event("trace action: Matching event histogram not found: ",
subsys_name, event_name, field_name);
hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@ -3245,8 +3285,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
kfree(cmd);
kfree(var_hist->cmd);
kfree(var_hist);
hist_err_event("trace action: Couldn't create histogram for field: ",
subsys_name, event_name, field_name);
hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
return ERR_PTR(ret);
}
@ -3258,8 +3297,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
if (IS_ERR_OR_NULL(event_var)) {
kfree(var_hist->cmd);
kfree(var_hist);
hist_err_event("trace action: Couldn't find synthetic variable: ",
subsys_name, event_name, field_name);
hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@ -3392,25 +3430,26 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
{
struct hist_field *val = NULL, *var = NULL;
unsigned long flags = HIST_FIELD_FL_VAR;
struct trace_array *tr = file->tr;
struct field_var *field_var;
int ret = 0;
if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
hist_err("Too many field variables defined: ", field_name);
hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
ret = -EINVAL;
goto err;
}
val = parse_atom(hist_data, file, field_name, &flags, NULL);
if (IS_ERR(val)) {
hist_err("Couldn't parse field variable: ", field_name);
hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
ret = PTR_ERR(val);
goto err;
}
var = create_var(hist_data, file, field_name, val->size, val->type);
if (IS_ERR(var)) {
hist_err("Couldn't create or find variable: ", field_name);
hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
kfree(val);
ret = PTR_ERR(var);
goto err;
@ -3737,19 +3776,20 @@ static int track_data_create(struct hist_trigger_data *hist_data,
{
struct hist_field *var_field, *ref_field, *track_var = NULL;
struct trace_event_file *file = hist_data->event_file;
struct trace_array *tr = file->tr;
char *track_data_var_str;
int ret = 0;
track_data_var_str = data->track_data.var_str;
if (track_data_var_str[0] != '$') {
hist_err("For onmax(x) or onchange(x), x must be a variable: ", track_data_var_str);
hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
return -EINVAL;
}
track_data_var_str++;
var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
if (!var_field) {
hist_err("Couldn't find onmax or onchange variable: ", track_data_var_str);
hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
return -EINVAL;
}
@ -3762,7 +3802,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONMAX)
track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
hist_err("Couldn't create onmax variable: ", "__max");
hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@ -3770,7 +3810,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONCHANGE)
track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
hist_err("Couldn't create onchange variable: ", "__change");
hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@ -3781,7 +3821,8 @@ static int track_data_create(struct hist_trigger_data *hist_data,
return ret;
}
static int parse_action_params(char *params, struct action_data *data)
static int parse_action_params(struct trace_array *tr, char *params,
struct action_data *data)
{
char *param, *saved_param;
bool first_param = true;
@ -3789,20 +3830,20 @@ static int parse_action_params(char *params, struct action_data *data)
while (params) {
if (data->n_params >= SYNTH_FIELDS_MAX) {
hist_err("Too many action params", "");
hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
goto out;
}
param = strsep(&params, ",");
if (!param) {
hist_err("No action param found", "");
hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
param = strstrip(param);
if (strlen(param) < 2) {
hist_err("Invalid action param: ", param);
hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
ret = -EINVAL;
goto out;
}
@ -3826,7 +3867,7 @@ static int parse_action_params(char *params, struct action_data *data)
return ret;
}
static int action_parse(char *str, struct action_data *data,
static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
enum handler_id handler)
{
char *action_name;
@ -3834,14 +3875,14 @@ static int action_parse(char *str, struct action_data *data,
strsep(&str, ".");
if (!str) {
hist_err("action parsing: No action found", "");
hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
action_name = strsep(&str, "(");
if (!action_name || !str) {
hist_err("action parsing: No action found", "");
hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
@ -3850,12 +3891,12 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!params) {
hist_err("action parsing: No params found for %s", "save");
hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
ret = -EINVAL;
goto out;
}
ret = parse_action_params(params, data);
ret = parse_action_params(tr, params, data);
if (ret)
goto out;
@ -3864,7 +3905,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
hist_err("action parsing: Handler doesn't support action: ", action_name);
hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@ -3876,7 +3917,7 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!str) {
hist_err("action parsing: No closing paren found: %s", params);
hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
ret = -EINVAL;
goto out;
}
@ -3886,7 +3927,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
hist_err("action parsing: Handler doesn't support action: ", action_name);
hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@ -3901,7 +3942,7 @@ static int action_parse(char *str, struct action_data *data,
data->use_trace_keyword = true;
if (params) {
ret = parse_action_params(params, data);
ret = parse_action_params(tr, params, data);
if (ret)
goto out;
}
@ -3954,7 +3995,7 @@ static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
goto free;
}
ret = action_parse(str, data, handler);
ret = action_parse(hist_data->event_file->tr, str, data, handler);
if (ret)
goto free;
out:
@ -4024,6 +4065,7 @@ trace_action_find_var(struct hist_trigger_data *hist_data,
struct action_data *data,
char *system, char *event, char *var)
{
struct trace_array *tr = hist_data->event_file->tr;
struct hist_field *hist_field;
var++; /* skip '$' */
@ -4039,7 +4081,7 @@ trace_action_find_var(struct hist_trigger_data *hist_data,
}
if (!hist_field)
hist_err_event("trace action: Couldn't find param: $", system, event, var);
hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
return hist_field;
}
@ -4097,6 +4139,7 @@ trace_action_create_field_var(struct hist_trigger_data *hist_data,
static int trace_action_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
struct trace_array *tr = hist_data->event_file->tr;
char *event_name, *param, *system = NULL;
struct hist_field *hist_field, *var_ref;
unsigned int i, var_ref_idx;
@ -4114,7 +4157,7 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
event = find_synth_event(synth_event_name);
if (!event) {
hist_err("trace action: Couldn't find synthetic event: ", synth_event_name);
hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
return -EINVAL;
}
@ -4175,15 +4218,14 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
continue;
}
hist_err_event("trace action: Param type doesn't match synthetic event field type: ",
system, event_name, param);
hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
kfree(p);
ret = -EINVAL;
goto err;
}
if (field_pos != event->n_fields) {
hist_err("trace action: Param count doesn't match synthetic event field count: ", event->name);
hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
ret = -EINVAL;
goto err;
}
@ -4202,6 +4244,7 @@ static int action_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
struct trace_event_file *file = hist_data->event_file;
struct trace_array *tr = file->tr;
struct track_data *track_data;
struct field_var *field_var;
unsigned int i;
@ -4229,7 +4272,7 @@ static int action_create(struct hist_trigger_data *hist_data,
if (data->action == ACTION_SAVE) {
if (hist_data->n_save_vars) {
ret = -EEXIST;
hist_err("save action: Can't have more than one save() action per hist", "");
hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
goto out;
}
@ -4242,7 +4285,8 @@ static int action_create(struct hist_trigger_data *hist_data,
field_var = create_target_field_var(hist_data, NULL, NULL, param);
if (IS_ERR(field_var)) {
hist_err("save action: Couldn't create field variable: ", param);
hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
errpos(param));
ret = PTR_ERR(field_var);
kfree(param);
goto out;
@ -4276,19 +4320,18 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
match_event = strsep(&str, ")");
if (!match_event || !str) {
hist_err("onmatch: Missing closing paren: ", match_event);
hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
goto free;
}
match_event_system = strsep(&match_event, ".");
if (!match_event) {
hist_err("onmatch: Missing subsystem for match event: ", match_event_system);
hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
goto free;
}
if (IS_ERR(event_file(tr, match_event_system, match_event))) {
hist_err_event("onmatch: Invalid subsystem or event name: ",
match_event_system, match_event, NULL);
hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
goto free;
}
@ -4304,7 +4347,7 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
goto free;
}
ret = action_parse(str, data, HANDLER_ONMATCH);
ret = action_parse(tr, str, data, HANDLER_ONMATCH);
if (ret)
goto free;
out:
@ -4373,13 +4416,14 @@ static int create_var_field(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
char *var_name, char *expr_str)
{
struct trace_array *tr = hist_data->event_file->tr;
unsigned long flags = 0;
if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
return -EINVAL;
if (find_var(hist_data, file, var_name) && !hist_data->remove) {
hist_err("Variable already defined: ", var_name);
hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
return -EINVAL;
}
@ -4436,8 +4480,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
char *field_str)
{
struct trace_array *tr = hist_data->event_file->tr;
struct hist_field *hist_field = NULL;
unsigned long flags = 0;
unsigned int key_size;
int ret = 0;
@ -4460,7 +4504,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
}
if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
hist_err("Using variable references as keys not supported: ", field_str);
hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
destroy_hist_field(hist_field, 0);
ret = -EINVAL;
goto out;
@ -4561,6 +4605,7 @@ static void free_var_defs(struct hist_trigger_data *hist_data)
static int parse_var_defs(struct hist_trigger_data *hist_data)
{
struct trace_array *tr = hist_data->event_file->tr;
char *s, *str, *var_name, *field_str;
unsigned int i, j, n_vars = 0;
int ret = 0;
@ -4574,13 +4619,14 @@ static int parse_var_defs(struct hist_trigger_data *hist_data)
var_name = strsep(&field_str, "=");
if (!var_name || !field_str) {
hist_err("Malformed assignment: ", var_name);
hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
errpos(var_name));
ret = -EINVAL;
goto free;
}
if (n_vars == TRACING_MAP_VARS_MAX) {
hist_err("Too many variables defined: ", var_name);
hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
ret = -EINVAL;
goto free;
}
@ -5431,11 +5477,6 @@ static int hist_show(struct seq_file *m, void *v)
hist_trigger_show(m, data, n++);
}
if (have_hist_err()) {
seq_printf(m, "\nERROR: %s\n", hist_err_str);
seq_printf(m, " Last command: %s\n", last_hist_cmd);
}
out_unlock:
mutex_unlock(&event_mutex);
@ -5800,6 +5841,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
{
struct hist_trigger_data *hist_data = data->private_data;
struct event_trigger_data *test, *named_data = NULL;
struct trace_array *tr = file->tr;
int ret = 0;
if (hist_data->attrs->name) {
@ -5807,7 +5849,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
if (named_data) {
if (!hist_trigger_match(data, named_data, named_data,
true)) {
hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name);
hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
ret = -EINVAL;
goto out;
}
@ -5828,7 +5870,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
else if (hist_data->attrs->clear)
hist_clear(test);
else {
hist_err("Hist trigger already exists", NULL);
hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
ret = -EEXIST;
}
goto out;
@ -5836,7 +5878,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
}
new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
ret = -ENOENT;
goto out;
}
@ -5861,7 +5903,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
if (ret) {
hist_err("Couldn't set trace_clock: ", clock);
hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
goto out;
}
@ -6037,8 +6079,8 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
lockdep_assert_held(&event_mutex);
if (glob && strlen(glob)) {
last_cmd_set(param);
hist_err_clear();
last_cmd_set(file, param);
}
if (!param)
@ -6079,7 +6121,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
trigger = strstrip(trigger);
}
attrs = parse_hist_trigger_attrs(trigger);
attrs = parse_hist_trigger_attrs(file->tr, trigger);
if (IS_ERR(attrs))
return PTR_ERR(attrs);

3
kernel/trace/trace_events_trigger.c
View File

@ -731,7 +731,8 @@ int set_trigger_filter(char *filter_str,
goto out;
/* The filter is for the 'trigger' event, not the triggered event */
ret = create_event_filter(file->event_call, filter_str, false, &filter);
ret = create_event_filter(file->tr, file->event_call,
filter_str, false, &filter);
/*
* If create_event_filter() fails, filter still needs to be freed.
* Which the calling code will do with data->filter.

61
kernel/trace/trace_kdb.c
View File

@ -17,29 +17,25 @@
#include "trace.h"
#include "trace_output.h"
static void ftrace_dump_buf(int skip_lines, long cpu_file)
static struct trace_iterator iter;
static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
static void ftrace_dump_buf(int skip_entries, long cpu_file)
{
/* use static because iter can be a bit big for the stack */
static struct trace_iterator iter;
static struct ring_buffer_iter *buffer_iter[CONFIG_NR_CPUS];
struct trace_array *tr;
unsigned int old_userobj;
int cnt = 0, cpu;
trace_init_global_iter(&iter);
iter.buffer_iter = buffer_iter;
tr = iter.tr;
for_each_tracing_cpu(cpu) {
atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
old_userobj = tr->trace_flags;
/* don't look at user memory in panic mode */
tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
kdb_printf("Dumping ftrace buffer:\n");
if (skip_entries)
kdb_printf("(skipping %d entries)\n", skip_entries);
/* reset all but tr, trace, and overruns */
memset(&iter.seq, 0,
@ -70,11 +66,11 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
kdb_printf("---------------------------------\n");
cnt++;
if (!skip_lines) {
if (!skip_entries) {
print_trace_line(&iter);
trace_printk_seq(&iter.seq);
} else {
skip_lines--;
skip_entries--;
}
if (KDB_FLAG(CMD_INTERRUPT))
@ -89,10 +85,6 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
out:
tr->trace_flags = old_userobj;
for_each_tracing_cpu(cpu) {
atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
for_each_tracing_cpu(cpu) {
if (iter.buffer_iter[cpu]) {
ring_buffer_read_finish(iter.buffer_iter[cpu]);
@ -106,17 +98,19 @@ static void ftrace_dump_buf(int skip_lines, long cpu_file)
*/
static int kdb_ftdump(int argc, const char **argv)
{
int skip_lines = 0;
int skip_entries = 0;
long cpu_file;
char *cp;
int cnt;
int cpu;
if (argc > 2)
return KDB_ARGCOUNT;
if (argc) {
skip_lines = simple_strtol(argv[1], &cp, 0);
skip_entries = simple_strtol(argv[1], &cp, 0);
if (*cp)
skip_lines = 0;
skip_entries = 0;
}
if (argc == 2) {
@ -129,7 +123,29 @@ static int kdb_ftdump(int argc, const char **argv)
}
kdb_trap_printk++;
ftrace_dump_buf(skip_lines, cpu_file);
trace_init_global_iter(&iter);
iter.buffer_iter = buffer_iter;
for_each_tracing_cpu(cpu) {
atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
/* A negative skip_entries means skip all but the last entries */
if (skip_entries < 0) {
if (cpu_file == RING_BUFFER_ALL_CPUS)
cnt = trace_total_entries(NULL);
else
cnt = trace_total_entries_cpu(NULL, cpu_file);
skip_entries = max(cnt + skip_entries, 0);
}
ftrace_dump_buf(skip_entries, cpu_file);
for_each_tracing_cpu(cpu) {
atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled);
}
kdb_trap_printk--;
return 0;
@ -137,8 +153,9 @@ static int kdb_ftdump(int argc, const char **argv)
static __init int kdb_ftrace_register(void)
{
kdb_register_flags("ftdump", kdb_ftdump, "[skip_#lines] [cpu]",
"Dump ftrace log", 0, KDB_ENABLE_ALWAYS_SAFE);
kdb_register_flags("ftdump", kdb_ftdump, "[skip_#entries] [cpu]",
"Dump ftrace log; -skip dumps last #entries", 0,
KDB_ENABLE_ALWAYS_SAFE);
return 0;
}

77
kernel/trace/trace_kprobe.c
View File

@ -441,13 +441,8 @@ static int __register_trace_kprobe(struct trace_kprobe *tk)
else
ret = register_kprobe(&tk->rp.kp);
if (ret == 0) {
if (ret == 0)
tk->tp.flags |= TP_FLAG_REGISTERED;
} else if (ret == -EILSEQ) {
pr_warn("Probing address(0x%p) is not an instruction boundary.\n",
tk->rp.kp.addr);
ret = -EINVAL;
}
return ret;
}
@ -591,7 +586,7 @@ static int trace_kprobe_create(int argc, const char *argv[])
* Type of args:
* FETCHARG:TYPE : use TYPE instead of unsigned long.
*/
struct trace_kprobe *tk;
struct trace_kprobe *tk = NULL;
int i, len, ret = 0;
bool is_return = false;
char *symbol = NULL, *tmp = NULL;
@ -615,44 +610,50 @@ static int trace_kprobe_create(int argc, const char *argv[])
if (argc < 2)
return -ECANCELED;
trace_probe_log_init("trace_kprobe", argc, argv);
event = strchr(&argv[0][1], ':');
if (event)
event++;
if (isdigit(argv[0][1])) {
if (!is_return) {
pr_info("Maxactive is not for kprobe");
return -EINVAL;
trace_probe_log_err(1, MAXACT_NO_KPROBE);
goto parse_error;
}
if (event)
len = event - &argv[0][1] - 1;
else
len = strlen(&argv[0][1]);
if (len > MAX_EVENT_NAME_LEN - 1)
return -E2BIG;
if (len > MAX_EVENT_NAME_LEN - 1) {
trace_probe_log_err(1, BAD_MAXACT);
goto parse_error;
}
memcpy(buf, &argv[0][1], len);
buf[len] = '\0';
ret = kstrtouint(buf, 0, &maxactive);
if (ret || !maxactive) {
pr_info("Invalid maxactive number\n");
return ret;
trace_probe_log_err(1, BAD_MAXACT);
goto parse_error;
}
/* kretprobes instances are iterated over via a list. The
* maximum should stay reasonable.
*/
if (maxactive > KRETPROBE_MAXACTIVE_MAX) {
pr_info("Maxactive is too big (%d > %d).\n",
maxactive, KRETPROBE_MAXACTIVE_MAX);
return -E2BIG;
trace_probe_log_err(1, MAXACT_TOO_BIG);
goto parse_error;
}
}
/* try to parse an address. if that fails, try to read the
* input as a symbol. */
if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
trace_probe_log_set_index(1);
/* Check whether uprobe event specified */
if (strchr(argv[1], '/') && strchr(argv[1], ':'))
return -ECANCELED;
if (strchr(argv[1], '/') && strchr(argv[1], ':')) {
ret = -ECANCELED;
goto error;
}
/* a symbol specified */
symbol = kstrdup(argv[1], GFP_KERNEL);
if (!symbol)
@ -660,23 +661,23 @@ static int trace_kprobe_create(int argc, const char *argv[])
/* TODO: support .init module functions */
ret = traceprobe_split_symbol_offset(symbol, &offset);
if (ret || offset < 0 || offset > UINT_MAX) {
pr_info("Failed to parse either an address or a symbol.\n");
goto out;
trace_probe_log_err(0, BAD_PROBE_ADDR);
goto parse_error;
}
if (kprobe_on_func_entry(NULL, symbol, offset))
flags |= TPARG_FL_FENTRY;
if (offset && is_return && !(flags & TPARG_FL_FENTRY)) {
pr_info("Given offset is not valid for return probe.\n");
ret = -EINVAL;
goto out;
trace_probe_log_err(0, BAD_RETPROBE);
goto parse_error;
}
}
argc -= 2; argv += 2;
trace_probe_log_set_index(0);
if (event) {
ret = traceprobe_parse_event_name(&event, &group, buf);
ret = traceprobe_parse_event_name(&event, &group, buf,
event - argv[0]);
if (ret)
goto out;
goto parse_error;
} else {
/* Make a new event name */
if (symbol)
@ -691,13 +692,14 @@ static int trace_kprobe_create(int argc, const char *argv[])
/* setup a probe */
tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
argc, is_return);
argc - 2, is_return);
if (IS_ERR(tk)) {
ret = PTR_ERR(tk);
/* This must return -ENOMEM otherwise there is a bug */
/* This must return -ENOMEM, else there is a bug */
WARN_ON_ONCE(ret != -ENOMEM);
goto out;
goto out; /* We know tk is not allocated */
}
argc -= 2; argv += 2;
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
@ -707,19 +709,32 @@ static int trace_kprobe_create(int argc, const char *argv[])
goto error;
}
trace_probe_log_set_index(i + 2);
ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
kfree(tmp);
if (ret)
goto error;
goto error; /* This can be -ENOMEM */
}
ret = register_trace_kprobe(tk);
if (ret)
if (ret) {
trace_probe_log_set_index(1);
if (ret == -EILSEQ)
trace_probe_log_err(0, BAD_INSN_BNDRY);
else if (ret == -ENOENT)
trace_probe_log_err(0, BAD_PROBE_ADDR);
else if (ret != -ENOMEM)
trace_probe_log_err(0, FAIL_REG_PROBE);
goto error;
}
out:
trace_probe_log_clear();
kfree(symbol);
return ret;
parse_error:
ret = -EINVAL;
error:
free_trace_kprobe(tk);
goto out;

291
kernel/trace/trace_probe.c
View File

@ -13,6 +13,11 @@
#include "trace_probe.h"
#undef C
#define C(a, b) b
static const char *trace_probe_err_text[] = { ERRORS };
static const char *reserved_field_names[] = {
"common_type",
"common_flags",
@ -133,6 +138,60 @@ static const struct fetch_type *find_fetch_type(const char *type)
return NULL;
}
static struct trace_probe_log trace_probe_log;
void trace_probe_log_init(const char *subsystem, int argc, const char **argv)
{
trace_probe_log.subsystem = subsystem;
trace_probe_log.argc = argc;
trace_probe_log.argv = argv;
trace_probe_log.index = 0;
}
void trace_probe_log_clear(void)
{
memset(&trace_probe_log, 0, sizeof(trace_probe_log));
}
void trace_probe_log_set_index(int index)
{
trace_probe_log.index = index;
}
void __trace_probe_log_err(int offset, int err_type)
{
char *command, *p;
int i, len = 0, pos = 0;
if (!trace_probe_log.argv)
return;
/* Recalcurate the length and allocate buffer */
for (i = 0; i < trace_probe_log.argc; i++) {
if (i == trace_probe_log.index)
pos = len;
len += strlen(trace_probe_log.argv[i]) + 1;
}
command = kzalloc(len, GFP_KERNEL);
if (!command)
return;
/* And make a command string from argv array */
p = command;
for (i = 0; i < trace_probe_log.argc; i++) {
len = strlen(trace_probe_log.argv[i]);
strcpy(p, trace_probe_log.argv[i]);
p[len] = ' ';
p += len + 1;
}
*(p - 1) = '\0';
tracing_log_err(NULL, trace_probe_log.subsystem, command,
trace_probe_err_text, err_type, pos + offset);
kfree(command);
}
/* Split symbol and offset. */
int traceprobe_split_symbol_offset(char *symbol, long *offset)
{
@ -156,7 +215,7 @@ int traceprobe_split_symbol_offset(char *symbol, long *offset)
/* @buf must has MAX_EVENT_NAME_LEN size */
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf)
char *buf, int offset)
{
const char *slash, *event = *pevent;
int len;
@ -164,32 +223,33 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
slash = strchr(event, '/');
if (slash) {
if (slash == event) {
pr_info("Group name is not specified\n");
trace_probe_log_err(offset, NO_GROUP_NAME);
return -EINVAL;
}
if (slash - event + 1 > MAX_EVENT_NAME_LEN) {
pr_info("Group name is too long\n");
return -E2BIG;
trace_probe_log_err(offset, GROUP_TOO_LONG);
return -EINVAL;
}
strlcpy(buf, event, slash - event + 1);
if (!is_good_name(buf)) {
pr_info("Group name must follow the same rules as C identifiers\n");
trace_probe_log_err(offset, BAD_GROUP_NAME);
return -EINVAL;
}
*pgroup = buf;
*pevent = slash + 1;
offset += slash - event + 1;
event = *pevent;
}
len = strlen(event);
if (len == 0) {
pr_info("Event name is not specified\n");
trace_probe_log_err(offset, NO_EVENT_NAME);
return -EINVAL;
} else if (len > MAX_EVENT_NAME_LEN) {
pr_info("Event name is too long\n");
return -E2BIG;
trace_probe_log_err(offset, EVENT_TOO_LONG);
return -EINVAL;
}
if (!is_good_name(event)) {
pr_info("Event name must follow the same rules as C identifiers\n");
trace_probe_log_err(offset, BAD_EVENT_NAME);
return -EINVAL;
}
return 0;
@ -198,56 +258,67 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
static int parse_probe_vars(char *arg, const struct fetch_type *t,
struct fetch_insn *code, unsigned int flags)
struct fetch_insn *code, unsigned int flags, int offs)
{
unsigned long param;
int ret = 0;
int len;
if (strcmp(arg, "retval") == 0) {
if (flags & TPARG_FL_RETURN)
if (flags & TPARG_FL_RETURN) {
code->op = FETCH_OP_RETVAL;
else
} else {
trace_probe_log_err(offs, RETVAL_ON_PROBE);
ret = -EINVAL;
}
} else if ((len = str_has_prefix(arg, "stack"))) {
if (arg[len] == '\0') {
code->op = FETCH_OP_STACKP;
} else if (isdigit(arg[len])) {
ret = kstrtoul(arg + len, 10, &param);
if (ret || ((flags & TPARG_FL_KERNEL) &&
param > PARAM_MAX_STACK))
if (ret) {
goto inval_var;
} else if ((flags & TPARG_FL_KERNEL) &&
param > PARAM_MAX_STACK) {
trace_probe_log_err(offs, BAD_STACK_NUM);
ret = -EINVAL;
else {
} else {
code->op = FETCH_OP_STACK;
code->param = (unsigned int)param;
}
} else
ret = -EINVAL;
goto inval_var;
} else if (strcmp(arg, "comm") == 0) {
code->op = FETCH_OP_COMM;
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
} else if (((flags & TPARG_FL_MASK) ==
(TPARG_FL_KERNEL | TPARG_FL_FENTRY)) &&
(len = str_has_prefix(arg, "arg"))) {
if (!isdigit(arg[len]))
return -EINVAL;
ret = kstrtoul(arg + len, 10, &param);
if (ret || !param || param > PARAM_MAX_STACK)
if (ret) {
goto inval_var;
} else if (!param || param > PARAM_MAX_STACK) {
trace_probe_log_err(offs, BAD_ARG_NUM);
return -EINVAL;
}
code->op = FETCH_OP_ARG;
code->param = (unsigned int)param - 1;
#endif
} else
ret = -EINVAL;
goto inval_var;
return ret;
inval_var:
trace_probe_log_err(offs, BAD_VAR);
return -EINVAL;
}
/* Recursive argument parser */
static int
parse_probe_arg(char *arg, const struct fetch_type *type,
struct fetch_insn **pcode, struct fetch_insn *end,
unsigned int flags)
unsigned int flags, int offs)
{
struct fetch_insn *code = *pcode;
unsigned long param;
@ -257,7 +328,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
switch (arg[0]) {
case '$':
ret = parse_probe_vars(arg + 1, type, code, flags);
ret = parse_probe_vars(arg + 1, type, code, flags, offs);
break;
case '%': /* named register */
@ -266,47 +337,57 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
code->op = FETCH_OP_REG;
code->param = (unsigned int)ret;
ret = 0;
}
} else
trace_probe_log_err(offs, BAD_REG_NAME);
break;
case '@': /* memory, file-offset or symbol */
if (isdigit(arg[1])) {
ret = kstrtoul(arg + 1, 0, &param);
if (ret)
if (ret) {
trace_probe_log_err(offs, BAD_MEM_ADDR);
break;
}
/* load address */
code->op = FETCH_OP_IMM;
code->immediate = param;
} else if (arg[1] == '+') {
/* kprobes don't support file offsets */
if (flags & TPARG_FL_KERNEL)
if (flags & TPARG_FL_KERNEL) {
trace_probe_log_err(offs, FILE_ON_KPROBE);
return -EINVAL;
}
ret = kstrtol(arg + 2, 0, &offset);
if (ret)
if (ret) {
trace_probe_log_err(offs, BAD_FILE_OFFS);
break;
}
code->op = FETCH_OP_FOFFS;
code->immediate = (unsigned long)offset; // imm64?
} else {
/* uprobes don't support symbols */
if (!(flags & TPARG_FL_KERNEL))
if (!(flags & TPARG_FL_KERNEL)) {
trace_probe_log_err(offs, SYM_ON_UPROBE);
return -EINVAL;
}
/* Preserve symbol for updating */
code->op = FETCH_NOP_SYMBOL;
code->data = kstrdup(arg + 1, GFP_KERNEL);
if (!code->data)
return -ENOMEM;
if (++code == end)
return -E2BIG;
if (++code == end) {
trace_probe_log_err(offs, TOO_MANY_OPS);
return -EINVAL;
}
code->op = FETCH_OP_IMM;
code->immediate = 0;
}
/* These are fetching from memory */
if (++code == end)
return -E2BIG;
if (++code == end) {
trace_probe_log_err(offs, TOO_MANY_OPS);
return -EINVAL;
}
*pcode = code;
code->op = FETCH_OP_DEREF;
code->offset = offset;
@ -317,28 +398,38 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
/* fall through */
case '-':
tmp = strchr(arg, '(');
if (!tmp)
if (!tmp) {
trace_probe_log_err(offs, DEREF_NEED_BRACE);
return -EINVAL;
}
*tmp = '\0';
ret = kstrtol(arg, 0, &offset);
if (ret)
if (ret) {
trace_probe_log_err(offs, BAD_DEREF_OFFS);
break;
}
offs += (tmp + 1 - arg) + (arg[0] != '-' ? 1 : 0);
arg = tmp + 1;
tmp = strrchr(arg, ')');
if (tmp) {
if (!tmp) {
trace_probe_log_err(offs + strlen(arg),
DEREF_OPEN_BRACE);
return -EINVAL;
} else {
const struct fetch_type *t2 = find_fetch_type(NULL);
*tmp = '\0';
ret = parse_probe_arg(arg, t2, &code, end, flags);
ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
if (ret)
break;
if (code->op == FETCH_OP_COMM)
if (code->op == FETCH_OP_COMM) {
trace_probe_log_err(offs, COMM_CANT_DEREF);
return -EINVAL;
if (++code == end)
return -E2BIG;
}
if (++code == end) {
trace_probe_log_err(offs, TOO_MANY_OPS);
return -EINVAL;
}
*pcode = code;
code->op = FETCH_OP_DEREF;
@ -348,6 +439,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
}
if (!ret && code->op == FETCH_OP_NOP) {
/* Parsed, but do not find fetch method */
trace_probe_log_err(offs, BAD_FETCH_ARG);
ret = -EINVAL;
}
return ret;
@ -379,7 +471,7 @@ static int __parse_bitfield_probe_arg(const char *bf,
return -EINVAL;
code++;
if (code->op != FETCH_OP_NOP)
return -E2BIG;
return -EINVAL;
*pcode = code;
code->op = FETCH_OP_MOD_BF;
@ -392,44 +484,66 @@ static int __parse_bitfield_probe_arg(const char *bf,
/* String length checking wrapper */
static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
struct probe_arg *parg, unsigned int flags)
struct probe_arg *parg, unsigned int flags, int offset)
{
struct fetch_insn *code, *scode, *tmp = NULL;
char *t, *t2;
char *t, *t2, *t3;
int ret, len;
if (strlen(arg) > MAX_ARGSTR_LEN) {
pr_info("Argument is too long.: %s\n", arg);
return -ENOSPC;
len = strlen(arg);
if (len > MAX_ARGSTR_LEN) {
trace_probe_log_err(offset, ARG_TOO_LONG);
return -EINVAL;
} else if (len == 0) {
trace_probe_log_err(offset, NO_ARG_BODY);
return -EINVAL;
}
parg->comm = kstrdup(arg, GFP_KERNEL);
if (!parg->comm) {
pr_info("Failed to allocate memory for command '%s'.\n", arg);
if (!parg->comm)
return -ENOMEM;
}
t = strchr(arg, ':');
if (t) {
*t = '\0';
t2 = strchr(++t, '[');
if (t2) {
*t2 = '\0';
parg->count = simple_strtoul(t2 + 1, &t2, 0);
if (strcmp(t2, "]") || parg->count == 0)
*t2++ = '\0';
t3 = strchr(t2, ']');
if (!t3) {
offset += t2 + strlen(t2) - arg;
trace_probe_log_err(offset,
ARRAY_NO_CLOSE);
return -EINVAL;
if (parg->count > MAX_ARRAY_LEN)
return -E2BIG;
} else if (t3[1] != '\0') {
trace_probe_log_err(offset + t3 + 1 - arg,
BAD_ARRAY_SUFFIX);
return -EINVAL;
}
*t3 = '\0';
if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
trace_probe_log_err(offset + t2 - arg,
BAD_ARRAY_NUM);
return -EINVAL;
}
if (parg->count > MAX_ARRAY_LEN) {
trace_probe_log_err(offset + t2 - arg,
ARRAY_TOO_BIG);
return -EINVAL;
}
}
}
/*
* The default type of $comm should be "string", and it can't be
* dereferenced.
*/
if (!t && strcmp(arg, "$comm") == 0)
/* Since $comm can not be dereferred, we can find $comm by strcmp */
if (strcmp(arg, "$comm") == 0) {
/* The type of $comm must be "string", and not an array. */
if (parg->count || (t && strcmp(t, "string")))
return -EINVAL;
parg->type = find_fetch_type("string");
else
} else
parg->type = find_fetch_type(t);
if (!parg->type) {
pr_info("Unsupported type: %s\n", t);
trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
return -EINVAL;
}
parg->offset = *size;
@ -444,13 +558,13 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
parg->count);
}
code = tmp = kzalloc(sizeof(*code) * FETCH_INSN_MAX, GFP_KERNEL);
code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL);
if (!code)
return -ENOMEM;
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
flags);
flags, offset);
if (ret)
goto fail;
@ -458,7 +572,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (!strcmp(parg->type->name, "string")) {
if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_IMM &&
code->op != FETCH_OP_COMM) {
pr_info("string only accepts memory or address.\n");
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
ret = -EINVAL;
goto fail;
}
@ -470,7 +585,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
*/
code++;
if (code->op != FETCH_OP_NOP) {
ret = -E2BIG;
trace_probe_log_err(offset, TOO_MANY_OPS);
ret = -EINVAL;
goto fail;
}
}
@ -483,7 +599,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
} else {
code++;
if (code->op != FETCH_OP_NOP) {
ret = -E2BIG;
trace_probe_log_err(offset, TOO_MANY_OPS);
ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_ST_RAW;
@ -493,20 +610,24 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
/* Modify operation */
if (t != NULL) {
ret = __parse_bitfield_probe_arg(t, parg->type, &code);
if (ret)
if (ret) {
trace_probe_log_err(offset + t - arg, BAD_BITFIELD);
goto fail;
}
}
/* Loop(Array) operation */
if (parg->count) {
if (scode->op != FETCH_OP_ST_MEM &&
scode->op != FETCH_OP_ST_STRING) {
pr_info("array only accepts memory or address\n");
trace_probe_log_err(offset + (t ? (t - arg) : 0),
BAD_STRING);
ret = -EINVAL;
goto fail;
}
code++;
if (code->op != FETCH_OP_NOP) {
ret = -E2BIG;
trace_probe_log_err(offset, TOO_MANY_OPS);
ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_LP_ARRAY;
@ -516,7 +637,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code->op = FETCH_OP_END;
/* Shrink down the code buffer */
parg->code = kzalloc(sizeof(*code) * (code - tmp + 1), GFP_KERNEL);
parg->code = kcalloc(code - tmp + 1, sizeof(*code), GFP_KERNEL);
if (!parg->code)
ret = -ENOMEM;
else
@ -555,15 +676,19 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
{
struct probe_arg *parg = &tp->args[i];
char *body;
int ret;
/* Increment count for freeing args in error case */
tp->nr_args++;
body = strchr(arg, '=');
if (body) {
if (body - arg > MAX_ARG_NAME_LEN || body == arg)
if (body - arg > MAX_ARG_NAME_LEN) {
trace_probe_log_err(0, ARG_NAME_TOO_LONG);
return -EINVAL;
} else if (body == arg) {
trace_probe_log_err(0, NO_ARG_NAME);
return -EINVAL;
}
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++;
} else {
@ -575,22 +700,16 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
return -ENOMEM;
if (!is_good_name(parg->name)) {
pr_info("Invalid argument[%d] name: %s\n",
i, parg->name);
trace_probe_log_err(0, BAD_ARG_NAME);
return -EINVAL;
}
if (traceprobe_conflict_field_name(parg->name, tp->args, i)) {
pr_info("Argument[%d]: '%s' conflicts with another field.\n",
i, parg->name);
trace_probe_log_err(0, USED_ARG_NAME);
return -EINVAL;
}
/* Parse fetch argument */
ret = traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags);
if (ret)
pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
return ret;
return traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags,
body - arg);
}
void traceprobe_free_probe_arg(struct probe_arg *arg)

78
kernel/trace/trace_probe.h
View File

@ -124,6 +124,7 @@ struct fetch_insn {
/* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
#define FETCH_INSN_MAX 16
#define FETCH_TOKEN_COMM (-ECOMM)
/* Fetch type information table */
struct fetch_type {
@ -280,8 +281,8 @@ extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
extern int traceprobe_parse_event_name(const char **pevent,
const char **pgroup, char *buf);
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf, int offset);
extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
@ -298,3 +299,76 @@ extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
#endif
extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
size_t offset, struct trace_probe *tp);
#undef ERRORS
#define ERRORS \
C(FILE_NOT_FOUND, "Failed to find the given file"), \
C(NO_REGULAR_FILE, "Not a regular file"), \
C(BAD_REFCNT, "Invalid reference counter offset"), \
C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \
C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \
C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \
C(MAXACT_NO_KPROBE, "Maxactive is not for kprobe"), \
C(BAD_MAXACT, "Invalid maxactive number"), \
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(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"), \
C(NO_EVENT_NAME, "Event name is not specified"), \
C(EVENT_TOO_LONG, "Event name is too long"), \
C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
C(BAD_STACK_NUM, "Invalid stack number"), \
C(BAD_ARG_NUM, "Invalid argument number"), \
C(BAD_VAR, "Invalid $-valiable specified"), \
C(BAD_REG_NAME, "Invalid register name"), \
C(BAD_MEM_ADDR, "Invalid memory address"), \
C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \
C(BAD_FILE_OFFS, "Invalid file offset value"), \
C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \
C(TOO_MANY_OPS, "Dereference is too much nested"), \
C(DEREF_NEED_BRACE, "Dereference needs a brace"), \
C(BAD_DEREF_OFFS, "Invalid dereference offset"), \
C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \
C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \
C(BAD_FETCH_ARG, "Invalid fetch argument"), \
C(ARRAY_NO_CLOSE, "Array is not closed"), \
C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \
C(BAD_ARRAY_NUM, "Invalid array size"), \
C(ARRAY_TOO_BIG, "Array number is too big"), \
C(BAD_TYPE, "Unknown type is specified"), \
C(BAD_STRING, "String accepts only memory argument"), \
C(BAD_BITFIELD, "Invalid bitfield"), \
C(ARG_NAME_TOO_LONG, "Argument name is too long"), \
C(NO_ARG_NAME, "Argument name is not specified"), \
C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \
C(USED_ARG_NAME, "This argument name is already used"), \
C(ARG_TOO_LONG, "Argument expression is too long"), \
C(NO_ARG_BODY, "No argument expression"), \
C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\
C(FAIL_REG_PROBE, "Failed to register probe event"),
#undef C
#define C(a, b) TP_ERR_##a
/* Define TP_ERR_ */
enum { ERRORS };
/* Error text is defined in trace_probe.c */
struct trace_probe_log {
const char *subsystem;
const char **argv;
int argc;
int index;
};
void trace_probe_log_init(const char *subsystem, int argc, const char **argv);
void trace_probe_log_set_index(int index);
void trace_probe_log_clear(void);
void __trace_probe_log_err(int offset, int err);
#define trace_probe_log_err(offs, err) \
__trace_probe_log_err(offs, TP_ERR_##err)

2
kernel/trace/trace_probe_tmpl.h
View File

@ -88,7 +88,7 @@ process_fetch_insn_bottom(struct fetch_insn *code, unsigned long val,
/* 3rd stage: store value to buffer */
if (unlikely(!dest)) {
if (code->op == FETCH_OP_ST_STRING) {
ret += fetch_store_strlen(val + code->offset);
ret = fetch_store_strlen(val + code->offset);
code++;
goto array;
} else

5
kernel/trace/trace_selftest.c
View File

@ -792,7 +792,10 @@ trace_selftest_startup_function_graph(struct tracer *trace,
/* check the trace buffer */
ret = trace_test_buffer(&tr->trace_buffer, &count);
trace->reset(tr);
/* Need to also simulate the tr->reset to remove this fgraph_ops */
tracing_stop_cmdline_record();
unregister_ftrace_graph(&fgraph_ops);
tracing_start();
if (!ret && !count) {

57
kernel/trace/trace_uprobe.c
View File

@ -156,7 +156,10 @@ fetch_store_string(unsigned long addr, void *dest, void *base)
if (unlikely(!maxlen))
return -ENOMEM;
ret = strncpy_from_user(dst, src, maxlen);
if (addr == FETCH_TOKEN_COMM)
ret = strlcpy(dst, current->comm, maxlen);
else
ret = strncpy_from_user(dst, src, maxlen);
if (ret >= 0) {
if (ret == maxlen)
dst[ret - 1] = '\0';
@ -180,7 +183,10 @@ fetch_store_strlen(unsigned long addr)
int len;
void __user *vaddr = (void __force __user *) addr;
len = strnlen_user(vaddr, MAX_STRING_SIZE);
if (addr == FETCH_TOKEN_COMM)
len = strlen(current->comm) + 1;
else
len = strnlen_user(vaddr, MAX_STRING_SIZE);
return (len > MAX_STRING_SIZE) ? 0 : len;
}
@ -220,6 +226,9 @@ process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest,
case FETCH_OP_IMM:
val = code->immediate;
break;
case FETCH_OP_COMM:
val = FETCH_TOKEN_COMM;
break;
case FETCH_OP_FOFFS:
val = translate_user_vaddr(code->immediate);
break;
@ -457,13 +466,19 @@ static int trace_uprobe_create(int argc, const char **argv)
return -ECANCELED;
}
trace_probe_log_init("trace_uprobe", argc, argv);
trace_probe_log_set_index(1); /* filename is the 2nd argument */
*arg++ = '\0';
ret = kern_path(filename, LOOKUP_FOLLOW, &path);
if (ret) {
trace_probe_log_err(0, FILE_NOT_FOUND);
kfree(filename);
trace_probe_log_clear();
return ret;
}
if (!d_is_reg(path.dentry)) {
trace_probe_log_err(0, NO_REGULAR_FILE);
ret = -EINVAL;
goto fail_address_parse;
}
@ -472,9 +487,16 @@ static int trace_uprobe_create(int argc, const char **argv)
rctr = strchr(arg, '(');
if (rctr) {
rctr_end = strchr(rctr, ')');
if (rctr > rctr_end || *(rctr_end + 1) != 0) {
if (!rctr_end) {
ret = -EINVAL;
pr_info("Invalid reference counter offset.\n");
rctr_end = rctr + strlen(rctr);
trace_probe_log_err(rctr_end - filename,
REFCNT_OPEN_BRACE);
goto fail_address_parse;
} else if (rctr_end[1] != '\0') {
ret = -EINVAL;
trace_probe_log_err(rctr_end + 1 - filename,
BAD_REFCNT_SUFFIX);
goto fail_address_parse;
}
@ -482,22 +504,23 @@ static int trace_uprobe_create(int argc, const char **argv)
*rctr_end = '\0';
ret = kstrtoul(rctr, 0, &ref_ctr_offset);
if (ret) {
pr_info("Invalid reference counter offset.\n");
trace_probe_log_err(rctr - filename, BAD_REFCNT);
goto fail_address_parse;
}
}
/* Parse uprobe offset. */
ret = kstrtoul(arg, 0, &offset);
if (ret)
if (ret) {
trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS);
goto fail_address_parse;
argc -= 2;
argv += 2;
}
/* setup a probe */
trace_probe_log_set_index(0);
if (event) {
ret = traceprobe_parse_event_name(&event, &group, buf);
ret = traceprobe_parse_event_name(&event, &group, buf,
event - argv[0]);
if (ret)
goto fail_address_parse;
} else {
@ -519,6 +542,9 @@ static int trace_uprobe_create(int argc, const char **argv)
kfree(tail);
}
argc -= 2;
argv += 2;
tu = alloc_trace_uprobe(group, event, argc, is_return);
if (IS_ERR(tu)) {
ret = PTR_ERR(tu);
@ -539,6 +565,7 @@ static int trace_uprobe_create(int argc, const char **argv)
goto error;
}
trace_probe_log_set_index(i + 2);
ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
is_return ? TPARG_FL_RETURN : 0);
kfree(tmp);
@ -547,20 +574,20 @@ static int trace_uprobe_create(int argc, const char **argv)
}
ret = register_trace_uprobe(tu);
if (ret)
goto error;
return 0;
if (!ret)
goto out;
error:
free_trace_uprobe(tu);
out:
trace_probe_log_clear();
return ret;
fail_address_parse:
trace_probe_log_clear();
path_put(&path);
kfree(filename);
pr_info("Failed to parse address or file.\n");
return ret;
}

19
tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc Normal file
View File

@ -0,0 +1,19 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: ftrace - test tracing error log support
fail() { #msg
echo $1
exit_fail
}
# event tracing is currently the only ftrace tracer that uses the
# tracing error_log, hence this check
if [ ! -f set_event ]; then
echo "event tracing is not supported"
exit_unsupported
fi
ftrace_errlog_check 'event filter parse error' '((sig >= 10 && sig < 15) || dsig ^== 17) && comm != bash' 'events/signal/signal_generate/filter'
exit 0

12
tools/testing/selftests/ftrace/test.d/functions
View File

@ -109,3 +109,15 @@ LOCALHOST=127.0.0.1
yield() {
ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
}
ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
pos=$(echo -n "${2%^*}" | wc -c) # error position
command=$(echo "$2" | tr -d ^)
echo "Test command: $command"
echo > error_log
(! echo "$command" > "$3" ) 2> /dev/null
grep "$1: error:" -A 3 error_log
N=$(tail -n 1 error_log | wc -c)
# " Command: " and "^\n" => 13
test $(expr 13 + $pos) -eq $N
}

85
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc Normal file
View File

@ -0,0 +1,85 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Kprobe event parser error log check
[ -f kprobe_events ] || exit_unsupported # this is configurable
[ -f error_log ] || exit_unsupported
check_error() { # command-with-error-pos-by-^
ftrace_errlog_check 'trace_kprobe' "$1" 'kprobe_events'
}
if grep -q 'r\[maxactive\]' README; then
check_error 'p^100 vfs_read' # MAXACT_NO_KPROBE
check_error 'r^1a111 vfs_read' # BAD_MAXACT
check_error 'r^100000 vfs_read' # MAXACT_TOO_BIG
fi
check_error 'p ^non_exist_func' # BAD_PROBE_ADDR (enoent)
check_error 'p ^hoge-fuga' # BAD_PROBE_ADDR (bad syntax)
check_error 'p ^hoge+1000-1000' # BAD_PROBE_ADDR (bad syntax)
check_error 'r ^vfs_read+10' # BAD_RETPROBE
check_error 'p:^/bar vfs_read' # NO_GROUP_NAME
check_error 'p:^12345678901234567890123456789012345678901234567890123456789012345/bar vfs_read' # GROUP_TOO_LONG
check_error 'p:^foo.1/bar vfs_read' # BAD_GROUP_NAME
check_error 'p:foo/^ vfs_read' # NO_EVENT_NAME
check_error 'p:foo/^12345678901234567890123456789012345678901234567890123456789012345 vfs_read' # EVENT_TOO_LONG
check_error 'p:foo/^bar.1 vfs_read' # BAD_EVENT_NAME
check_error 'p vfs_read ^$retval' # RETVAL_ON_PROBE
check_error 'p vfs_read ^$stack10000' # BAD_STACK_NUM
if grep -q '$arg<N>' README; then
check_error 'p vfs_read ^$arg10000' # BAD_ARG_NUM
fi
check_error 'p vfs_read ^$none_var' # BAD_VAR
check_error 'p vfs_read ^%none_reg' # BAD_REG_NAME
check_error 'p vfs_read ^@12345678abcde' # BAD_MEM_ADDR
check_error 'p vfs_read ^@+10' # FILE_ON_KPROBE
check_error 'p vfs_read ^+0@0)' # DEREF_NEED_BRACE
check_error 'p vfs_read ^+0ab1(@0)' # BAD_DEREF_OFFS
check_error 'p vfs_read +0(+0(@0^)' # DEREF_OPEN_BRACE
if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
check_error 'p vfs_read +0(^$comm)' # COMM_CANT_DEREF
fi
check_error 'p vfs_read ^&1' # BAD_FETCH_ARG
# We've introduced this limitation with array support
if grep -q ' <type>\\\[<array-size>\\\]' README; then
check_error 'p vfs_read +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))' # TOO_MANY_OPS?
check_error 'p vfs_read +0(@11):u8[10^' # ARRAY_NO_CLOSE
check_error 'p vfs_read +0(@11):u8[10]^a' # BAD_ARRAY_SUFFIX
check_error 'p vfs_read +0(@11):u8[^10a]' # BAD_ARRAY_NUM
check_error 'p vfs_read +0(@11):u8[^256]' # ARRAY_TOO_BIG
fi
check_error 'p vfs_read @11:^unknown_type' # BAD_TYPE
check_error 'p vfs_read $stack0:^string' # BAD_STRING
check_error 'p vfs_read @11:^b10@a/16' # BAD_BITFIELD
check_error 'p vfs_read ^arg123456789012345678901234567890=@11' # ARG_NAME_TOO_LOG
check_error 'p vfs_read ^=@11' # NO_ARG_NAME
check_error 'p vfs_read ^var.1=@11' # BAD_ARG_NAME
check_error 'p vfs_read var1=@11 ^var1=@12' # USED_ARG_NAME
check_error 'p vfs_read ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))' # ARG_TOO_LONG
check_error 'p vfs_read arg1=^' # NO_ARG_BODY
# instruction boundary check is valid on x86 (at this moment)
case $(uname -m) in
x86_64|i[3456]86)
echo 'p vfs_read' > kprobe_events
if grep -q FTRACE ../kprobes/list ; then
check_error 'p ^vfs_read+3' # BAD_INSN_BNDRY (only if function-tracer is enabled)
fi
;;
esac
exit 0

23
tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc Normal file
View File

@ -0,0 +1,23 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Uprobe event parser error log check
[ -f uprobe_events ] || exit_unsupported # this is configurable
[ -f error_log ] || exit_unsupported
check_error() { # command-with-error-pos-by-^
ftrace_errlog_check 'trace_uprobe' "$1" 'uprobe_events'
}
check_error 'p ^/non_exist_file:100' # FILE_NOT_FOUND
check_error 'p ^/sys:100' # NO_REGULAR_FILE
check_error 'p /bin/sh:^10a' # BAD_UPROBE_OFFS
check_error 'p /bin/sh:10(^1a)' # BAD_REFCNT
check_error 'p /bin/sh:10(10^' # REFCNT_OPEN_BRACE
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
exit 0

28
tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc
View File

@ -1,28 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: event trigger - test extended error support
fail() { #msg
echo $1
exit_fail
}
if [ ! -f set_event ]; then
echo "event tracing is not supported"
exit_unsupported
fi
if [ ! -f synthetic_events ]; then
echo "synthetic event is not supported"
exit_unsupported
fi
echo "Test extended error support"
echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
! echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_wakeup/trigger 2> /dev/null
if ! grep -q "ERROR:" events/sched/sched_wakeup/hist; then
fail "Failed to generate extended error in histogram"
fi
exit 0