The event trigger code that checks for callback triggers before and
after recording of an event has lots of flags checks. This code is
duplicated throughout the ftrace events, kprobes and system calls.
They all do the exact same checks against the event flags.
Added helper functions ftrace_trigger_soft_disabled(),
event_trigger_unlock_commit() and event_trigger_unlock_commit_regs()
that consolidated the code and these are used instead.
Link: http://lkml.kernel.org/r/20140106222703.5e7dbba2@gandalf.local.home
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Since create_image() only executes platform_leave() if in_suspend is
not set, enable_nonboot_cpus() is run by it with EC transactions
blocked (on ACPI systems) in the image creation code path (that is,
for in_suspend set), which may cause CPU online to fail for the CPUs
in question. In particular, this causes the acpi_cpufreq driver's
initialization to fail for those CPUs on some systems with the
following dmesg:
cpufreq: adding CPU 1
acpi_cpufreq_cpu_init
cpufreq: FREQ: 1401000 - CPU: 0
ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for [EmbeddedControl] (20130725/evregion-287)
ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPC_.EC__.LPMD] (Node ffff88023249ab28), AE_BAD_PARAMETER (20130725/psparse-536)
ACPI Error: Method parse/execution failed [\_PR_.CPU0._PPC] (Node ffff88023270e3f8), AE_BAD_PARAMETER (20130725/psparse-536)
ACPI Error: Method parse/execution failed [\_PR_.CPU1._PPC] (Node ffff88023270e290), AE_BAD_PARAMETER (20130725/psparse-536)
ACPI Exception: AE_BAD_PARAMETER, Evaluating _PPC (20130725/processor_perflib-140)
cpufreq: initialization failed
CPU1 is up
To fix this problem, modify create_image() to execute platform_leave()
unconditionally. [rjw: This shouldn't lead to any significant side
effects on ACPI systems.]
Signed-off-by: Bjørn Mork <bjorn@mork.no>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
When kprobe-based dynamic event tracer is not enabled, it caused
following build error:
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c8dd): undefined reference to `fetch_symbol_u8'
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c8e9): undefined reference to `fetch_symbol_u16'
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c8f5): undefined reference to `fetch_symbol_u32'
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c901): undefined reference to `fetch_symbol_u64'
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c909): undefined reference to `fetch_symbol_string'
kernel/built-in.o: In function `traceprobe_update_arg':
(.text+0x10c913): undefined reference to `fetch_symbol_string_size'
...
It was due to the fetch methods are referred from CHECK_FETCH_FUNCS
macro and since it was only defined in trace_kprobe.c. Move NULL
definition of such fetch functions to the header file.
Note, it also requires CONFIG_BRANCH_PROFILING enabled to trigger
this failure as well. This is because the "fetch_symbol_*" variables
are referenced in a "else if" statement that will only call
update_symbol_cache(), which is a static inline stub function
when CONFIG_KPROBE_EVENT is not enabled. gcc is smart enough
to optimize this "else if" out and that also removes the code that
references the undefined variables.
But when BRANCH_PROFILING is enabled, it fools gcc into keeping
the if statement around and thus references the undefined symbols
and fails to build.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Enable to fetch data from a file offset. Currently it only supports
fetching from same binary uprobe set. It'll translate the file offset
to a proper virtual address in the process.
The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
uprobe_trace_print() and uprobe_perf_print() need to pass the additional
info to call_fetch() methods, currently there is no simple way to do this.
current->utask looks like a natural place to hold this info, but we need
to allocate it before handler_chain().
This is a bit unfortunate, perhaps we will find a better solution later,
but this is simple and should work right now.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Enable to fetch other types of argument for the uprobes. IOW, we can
access stack, memory, deref, bitfield and retval from uprobes now.
The format for the argument types are same as kprobes (but @SYMBOL
type is not supported for uprobes), i.e:
@ADDR : Fetch memory at ADDR
$stackN : Fetch Nth entry of stack (N >= 0)
$stack : Fetch stack address
$retval : Fetch return value
+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address
Note that the retval only can be used with uretprobes.
Original-patch-by: Hyeoncheol Lee <cheol.lee@lge.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Fetching from user space should be done in a non-atomic context. So
use a per-cpu buffer and copy its content to the ring buffer
atomically. Note that we can migrate during accessing user memory
thus use a per-cpu mutex to protect concurrent accesses.
This is needed since we'll be able to fetch args from an user memory
which can be swapped out. Before that uprobes could fetch args from
registers only which saved in a kernel space.
While at it, use __get_data_size() and store_trace_args() to reduce
code duplication. And add struct uprobe_cpu_buffer and its helpers as
suggested by Oleg.
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
The deref fetch methods access a memory region but it assumes that
it's a kernel memory since uprobes does not support them.
Add ->fetch and ->fetch_size member in order to provide a proper
access methods for supporting uprobes.
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
[namhyung@kernel.org: Split original patch into pieces as requested]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Use separate fetch_type_table for kprobes and uprobes. It currently
shares all fetch methods but some of them will be implemented
differently later.
This is not to break build if [ku]probes is configured alone (like
!CONFIG_KPROBE_EVENT and CONFIG_UPROBE_EVENT). So I added '__weak'
to the table declaration so that it can be safely omitted when it
configured out.
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
The print format of s32 type was "ld" and it's casted to "long". So
it turned out to print 4294967295 for "-1" on 64-bit systems. Not
sure whether it worked well on 32-bit systems.
Anyway, it doesn't need to have cast argument at all since it already
casted using type pointer - just get rid of it. Thanks to Oleg for
pointing that out.
And print 0x prefix for unsigned type as it shows hex numbers.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
The filter field of the event_trigger_data structure is protected under
RCU sched locks. It was not annotated as such, and after doing so,
sparse pointed out several locations that required fix ups.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Trace event triggers added a lseek that uses the ftrace_filter_lseek()
function. Unfortunately, when function tracing is not configured in
that function is not defined and the kernel fails to build.
This is the second time that function was added to a file ops and
it broke the build due to requiring special config dependencies.
Make a generic tracing_lseek() that all the tracing utilities may
use.
Also, modify the old ftrace_filter_lseek() to return 0 instead of
1 on WRONLY. Not sure why it was a 1 as that does not make sense.
This also changes the old tracing_seek() to modify the file pos
pointer on WRONLY as well.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
