- 24 May, 2008 1 commit
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Pekka Paalanen authored
Mmiotrace is a tool for trapping memory mapped IO (MMIO) accesses within the kernel. It is used for debugging and especially for reverse engineering evil binary drivers. Mmiotrace works by wrapping the ioremap family of kernel functions and marking the returned pages as not present. Access to the IO memory triggers a page fault, which will be handled by mmiotrace's custom page fault handler. This will single-step the faulted instruction with the MMIO page marked as present. Access logs are directed to user space via relay and debug_fs. This page fault approach is necessary, because binary drivers have readl/writel etc. calls inlined and therefore extremely difficult to trap with with e.g. kprobes. This patch depends on the custom page fault handlers patch. Signed-off-by:
Pekka Paalanen <pq@iki.fi> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de>
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- 23 May, 2008 39 commits
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Steven Rostedt authored
Now that ftrace is being ported to other architectures, it has become apparent that DYNAMIC_FTRACE is dependent on whether or not that architecture implements dynamic ftrace. FTRACE itself may be ported to an architecture without porting dynamic ftrace. This patch adds HAVE_DYNAMIC_FTRACE to allow architectures to port ftrace without having to also port the dynamic aspect as well. Signed-off-by:
Steven Rostedt <srostedt@redhat.com> Signed-off-by:
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Steven Rostedt authored
This patch removes the Makefile turd and uses the nice CFLAGS_REMOVE macro in the x86/kernel directory. Signed-off-by:
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Steven Rostedt authored
This patch removes the Makefile turd and uses the nice CFLAGS_REMOVE macro in the lib directory. Signed-off-by:
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Steven Rostedt authored
This patch removes the Makefile turd and uses the nice CFLAGS_REMOVE macro in the kernel directory. Signed-off-by:
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Steven Rostedt authored
We currently have a way to add special CFLAGS to code, but we do not have a way to remove them if needed. With the case of ftrace, some files should simply not be profiled. Adding the -pg flag to these files is simply a waste, and adding "notrace" to each and every function is ugly. Currently we put in "Makefile turd" [1] to stop the compiler from adding -pg to certain files. This was clumsy and awkward. This patch now adds the revese of CFLAGS_(basename).o with CFLAGS_REMOVE_(basename).o. This allows developers to prevent certain CFLAGS from being used to compile files. For example, we can now do CFLAGS_REMOVE_string.o = -pg to remove the -pg option from the string.o file in the lib directory. Note: a space delimited list of options may be added to the REMOVE macro. [1] - what David Miller called the workaronud to remove -pg Signed-off-by:
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Steven Rostedt authored
This patch adds full support for ftrace for PowerPC (both 64 and 32 bit). This includes dynamic tracing and function filtering. Signed-off-by:
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Steven Rostedt authored
PPC doesn't have the irqs_disabled_flags needed by ftrace. This patch adds it. Signed-off-by:
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Ingo Molnar authored
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Ingo Molnar authored
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Ingo Molnar authored
factor out code and clean it up. Signed-off-by:
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Ingo Molnar authored
David S. Miller noticed the following bug: the -pg instrumentation function callback is named differently on each platform. On x86 it is mcount, on sparc it is _mcount. So the export does not make sense in kernel/trace/ftrace.c - move it to x86. Signed-off-by:
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David Miller authored
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David S. Miller <davem@davemloft.net> Signed-off-by:
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David Miller authored
It causes unaligned access traps on platforms like sparc (ftrace_page may be marked packed, but once we return a dyn_ftrace sub-object from this array to another piece of code, the "packed" part of the typing information doesn't propagate). But also, it didn't serve any purpose either. Even if packed, on 64-bit or 32-bit, it didn't give us any more dyn_ftrace entries per-page. Signed-off-by:
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Ingo Molnar authored
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Mathieu Desnoyers authored
Porting ftrace to the marker infrastructure. Don't need to chain to the wakeup tracer from the sched tracer, because markers support multiple probes connected. Signed-off-by:
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
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Mathieu Desnoyers authored
To support the forthcoming "immediate values" marker optimization, we must have a way to declare markers in few code paths that does not use instruction modification based enable. This will be the case of printk(), some traps and eventually lockdep instrumentation. Changelog : - Fix reversed boolean logic of "generic". Signed-off-by:
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Mathieu Desnoyers authored
Denys Vlasenko <vda.linux@googlemail.com> : > Not in this patch, but I noticed: > > #define __trace_mark(name, call_private, format, args...) \ > do { \ > static const char __mstrtab_##name[] \ > __attribute__((section("__markers_strings"))) \ > = #name "\0" format; \ > static struct marker __mark_##name \ > __attribute__((section("__markers"), aligned(8))) = \ > { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \ > 0, 0, marker_probe_cb, \ > { __mark_empty_function, NULL}, NULL }; \ > __mark_check_format(format, ## args); \ > if (unlikely(__mark_##name.state)) { \ > (*__mark_##name.call) \ > (&__mark_##name, call_private, \ > format, ## args); \ > } \ > } while (0) > > In this call: > > (*__mark_##name.call) \ > (&__mark_##name, call_private, \ > format, ## args); \ > > you make gcc allocate duplicate format string. You can use > &__mstrtab_##name[sizeof(#name)] instead since it holds the same string, > or drop ", format," above and "const char *fmt" from here: > > void (*call)(const struct marker *mdata, /* Probe wrapper */ > void *call_private, const char *fmt, ...); > > since mdata->format is the same and all callees which need it can take it there. Very good point. I actually thought about dropping it, since it would remove an unnecessary argument from the stack. And actually, since I now have the marker_probe_cb sitting between the marker site and the callbacks, there is no API change required. Thanks :) Mathieu Signed-off-by: -
Steven Rostedt authored
Currently there is no protection from the root user to use up all of memory for trace buffers. If the root user allocates too many entries, the OOM killer might start kill off all tasks. This patch adds an algorith to check the following condition: pages_requested > (freeable_memory + current_trace_buffer_pages) / 4 If the above is met then the allocation fails. The above prevents more than 1/4th of freeable memory from being used by trace buffers. To determine the freeable_memory, I made determine_dirtyable_memory in mm/page-writeback.c global. Special thanks goes to Peter Zijlstra for suggesting the above calculation. Signed-off-by:
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Pekka Paalanen authored
Refactor code from tracing_read_pipe() and create trace_seq_to_user(). Moved trace_seq_reset() call before iter->trace->read() call so that when all leftover data is returned, trace_seq is reset automatically. Signed-off-by:
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Steven Rostedt authored
Due to debug hooks in the kernel that can change the way smp_processor_id works, use raw_smp_processor_id in mcount called functions (namely ftrace_record_ip). Currently we annotate most debug functions from calling mcount, but we should not rely on that to prevent kernel lockups. This patch uses the raw_smp_processor_id to prevent a recusive crash that can happen if a debug hook in smp_processor_id calls mcount. Signed-off-by:
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Ingo Molnar authored
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Ingo Molnar authored
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Steven Rostedt authored
In resetting the iterator in read_pipe, the reset of pos was postitioned in the wrong location with respect to the memset operation. The current code sets pos, incorrectly, to zero. Signed-off-by:
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Pekka Paalanen authored
text_poke is sleepable. The original fix by Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>. Signed-off-by:
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Steven Rostedt authored
This patch adds a method for open_pipe and open_read to the pluggins so that they can add a header to the trace pipe call. Signed-off-by:
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Steven Rostedt authored
This patch sets up the infrastructure to record overruns of the tracing buffer. Signed-off-by:
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Pekka Paalanen authored
Without CONFIG_DYNAMIC_FTRACE, mark_rodata_ro() would mark a wrong number of pages as no-execute. The bug was introduced in the patch "ftrace: dont write protect kernel text". The symptom was machine reboot after a CPU hotplug. Signed-off-by:
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Steven Rostedt authored
In cleaning up of the sched_switch code, the function trace recording of task comms was removed. This patch adds back the recording of comms for function trace. The output of ftrace now has the task comm instead of <...>. Signed-off-by:
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Steven Rostedt authored
This is first installment of adding documentation to the ftrace. Expect many more patches of this kind in the near future. Signed-off-by:
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Steven Rostedt authored
Currently ftrace allocates a trace buffer for every possible CPU. Work is being done to change it to only online CPUs and add hooks to hotplug CPUS. This patch lays out the infrastructure for such a change. Signed-off-by:
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Steven Rostedt authored
Andrew Morton suggested using strict_strtoul over simple_strtoul. This patch replaces them in ftrace. Signed-off-by:
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Steven Rostedt authored
Andrew Morton mentioned some clean ups that should be done to ftrace. This patch does some of the simple clean ups. Signed-off-by:
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Ingo Molnar authored
no code changed. Signed-off-by:
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Thomas Gleixner authored
simplify hex to ascii conversion. Signed-off-by:
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Steven Rostedt authored
With the introduction of ftrace, it is possible to recurse into the lockdep functions via the mcount call. To prevent possible lockups, updating the lockdep_recursion counter on grabbing the internal lockdep_lock should prevent deadlocks. Signed-off-by:
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Steven Rostedt authored
This patch adds /debug/tracing/trace_entries that allows users to see as well as modify the number of trace entries the buffers hold. The number of entries only increments in ENTRIES_PER_PAGE which is calculated by the size of an entry with the number of entries that can fit in a page. The user does not need to use an exact size, but the entries will be rounded to one of the increments. Trying to set the entries to 0 will return with -EINVAL. To avoid race conditions, the modification of the buffer size can only be done when tracing is completely disabled (current_tracer == none). A info message will be printed if a user tries to modify the buffer size when not set to none. Signed-off-by:
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Steven Rostedt authored
The wakeup selftest used an internal API for setting the test task priority. This patch fixes it to use the proper API for performing such a task. Thanks goes to Randy Dunlap for pointing out this build failure. Signed-off-by:
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Steven Rostedt authored
This patch implements "NONBLOCK" for trace_pipe. If the trace_pipe is opened with O_NONBLOCK, then the trace_pipe read will not block when buffer is empty. Signed-off-by:
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Steven Rostedt authored
Break out of while loop with EOF when the current_trace changes. Signed-off-by:
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