f984b51e07
On Sat, 22 Mar 2008 13:07:47 +0100 Ingo Molnar <mingo@elte.hu> wrote: > > > i'd suggest the following: pull x86.git and sched-devel.git into a > > > single tree [the two will combine without rejects]. Then try to add a > > > kernel/tracing/trace_mmiotrace.c ftrace plugin. The trace_sysprof.c > > > plugin might be a good example. > > > > I did this and now I have mmiotrace enabled/disabled via the tracing > > framework (what do we call this, since ftrace is one of the tracers?). > > cool! could you send the patches for that? (even if they are not fully > functional yet) Patch attached in the end. Nice to see how much code disappeared. I tried to mark all the features I had to break with XXX-comments. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* Memory mapped I/O tracing
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*
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* Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>
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*/
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#define DEBUG 1
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#include <linux/kernel.h>
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#include <linux/mmiotrace.h>
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#include "trace.h"
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extern void
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__trace_special(void *__tr, void *__data,
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unsigned long arg1, unsigned long arg2, unsigned long arg3);
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static struct trace_array *mmio_trace_array;
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static void mmio_trace_init(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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mmio_trace_array = tr;
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if (tr->ctrl)
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enable_mmiotrace();
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}
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static void mmio_trace_reset(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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if (tr->ctrl)
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disable_mmiotrace();
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}
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static void mmio_trace_ctrl_update(struct trace_array *tr)
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{
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pr_debug("in %s\n", __func__);
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if (tr->ctrl)
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enable_mmiotrace();
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else
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disable_mmiotrace();
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}
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static struct tracer mmio_tracer __read_mostly =
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{
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.name = "mmiotrace",
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.init = mmio_trace_init,
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.reset = mmio_trace_reset,
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.ctrl_update = mmio_trace_ctrl_update,
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};
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__init static int init_mmio_trace(void)
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{
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int ret = init_mmiotrace();
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if (ret)
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return ret;
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return register_tracer(&mmio_tracer);
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}
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device_initcall(init_mmio_trace);
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void mmio_trace_record(u32 type, unsigned long addr, unsigned long arg)
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{
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struct trace_array *tr = mmio_trace_array;
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struct trace_array_cpu *data = tr->data[smp_processor_id()];
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if (!current || current->pid == 0) {
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/*
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* XXX: This is a problem. We need to able to record, no
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* matter what. tracing_generic_entry_update() would crash.
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*/
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static unsigned limit;
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if (limit++ < 12)
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pr_err("Error in %s: no current.\n", __func__);
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return;
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}
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if (!tr || !data) {
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static unsigned limit;
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if (limit++ < 12)
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pr_err("%s: no tr or data\n", __func__);
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return;
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}
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__trace_special(tr, data, type, addr, arg);
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}
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