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974 lines
22 KiB
974 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* ring buffer based function tracer |
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* |
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* Copyright (C) 2007-2008 Steven Rostedt <[email protected]> |
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* Copyright (C) 2008 Ingo Molnar <[email protected]> |
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* |
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* Based on code from the latency_tracer, that is: |
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* |
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* Copyright (C) 2004-2006 Ingo Molnar |
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* Copyright (C) 2004 Nadia Yvette Chambers |
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*/ |
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#include <linux/ring_buffer.h> |
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#include <linux/debugfs.h> |
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#include <linux/uaccess.h> |
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#include <linux/ftrace.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> |
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|
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#include "trace.h" |
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|
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static void tracing_start_function_trace(struct trace_array *tr); |
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static void tracing_stop_function_trace(struct trace_array *tr); |
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static void |
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function_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, struct ftrace_regs *fregs); |
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static void |
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function_stack_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, struct ftrace_regs *fregs); |
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static void |
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function_no_repeats_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, struct ftrace_regs *fregs); |
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static void |
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function_stack_no_repeats_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, |
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struct ftrace_regs *fregs); |
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static struct tracer_flags func_flags; |
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|
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/* Our option */ |
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enum { |
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|
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TRACE_FUNC_NO_OPTS = 0x0, /* No flags set. */ |
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TRACE_FUNC_OPT_STACK = 0x1, |
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TRACE_FUNC_OPT_NO_REPEATS = 0x2, |
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|
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/* Update this to next highest bit. */ |
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TRACE_FUNC_OPT_HIGHEST_BIT = 0x4 |
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}; |
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|
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#define TRACE_FUNC_OPT_MASK (TRACE_FUNC_OPT_HIGHEST_BIT - 1) |
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|
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int ftrace_allocate_ftrace_ops(struct trace_array *tr) |
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{ |
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struct ftrace_ops *ops; |
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|
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/* The top level array uses the "global_ops" */ |
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if (tr->flags & TRACE_ARRAY_FL_GLOBAL) |
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return 0; |
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|
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ops = kzalloc(sizeof(*ops), GFP_KERNEL); |
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if (!ops) |
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return -ENOMEM; |
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|
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/* Currently only the non stack version is supported */ |
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ops->func = function_trace_call; |
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ops->flags = FTRACE_OPS_FL_PID; |
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|
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tr->ops = ops; |
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ops->private = tr; |
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|
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return 0; |
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} |
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|
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void ftrace_free_ftrace_ops(struct trace_array *tr) |
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{ |
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kfree(tr->ops); |
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tr->ops = NULL; |
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} |
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|
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int ftrace_create_function_files(struct trace_array *tr, |
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struct dentry *parent) |
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{ |
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/* |
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* The top level array uses the "global_ops", and the files are |
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* created on boot up. |
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*/ |
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if (tr->flags & TRACE_ARRAY_FL_GLOBAL) |
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return 0; |
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|
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if (!tr->ops) |
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return -EINVAL; |
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|
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ftrace_create_filter_files(tr->ops, parent); |
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|
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return 0; |
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} |
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|
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void ftrace_destroy_function_files(struct trace_array *tr) |
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{ |
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ftrace_destroy_filter_files(tr->ops); |
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ftrace_free_ftrace_ops(tr); |
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} |
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|
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static ftrace_func_t select_trace_function(u32 flags_val) |
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{ |
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switch (flags_val & TRACE_FUNC_OPT_MASK) { |
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case TRACE_FUNC_NO_OPTS: |
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return function_trace_call; |
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case TRACE_FUNC_OPT_STACK: |
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return function_stack_trace_call; |
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case TRACE_FUNC_OPT_NO_REPEATS: |
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return function_no_repeats_trace_call; |
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case TRACE_FUNC_OPT_STACK | TRACE_FUNC_OPT_NO_REPEATS: |
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return function_stack_no_repeats_trace_call; |
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default: |
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return NULL; |
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} |
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} |
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|
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static bool handle_func_repeats(struct trace_array *tr, u32 flags_val) |
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{ |
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if (!tr->last_func_repeats && |
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(flags_val & TRACE_FUNC_OPT_NO_REPEATS)) { |
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tr->last_func_repeats = alloc_percpu(struct trace_func_repeats); |
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if (!tr->last_func_repeats) |
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return false; |
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} |
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return true; |
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} |
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|
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static int function_trace_init(struct trace_array *tr) |
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{ |
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ftrace_func_t func; |
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/* |
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* Instance trace_arrays get their ops allocated |
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* at instance creation. Unless it failed |
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* the allocation. |
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*/ |
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if (!tr->ops) |
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return -ENOMEM; |
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|
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func = select_trace_function(func_flags.val); |
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if (!func) |
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return -EINVAL; |
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if (!handle_func_repeats(tr, func_flags.val)) |
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return -ENOMEM; |
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ftrace_init_array_ops(tr, func); |
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|
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tr->array_buffer.cpu = raw_smp_processor_id(); |
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|
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tracing_start_cmdline_record(); |
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tracing_start_function_trace(tr); |
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return 0; |
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} |
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|
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static void function_trace_reset(struct trace_array *tr) |
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{ |
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tracing_stop_function_trace(tr); |
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tracing_stop_cmdline_record(); |
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ftrace_reset_array_ops(tr); |
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} |
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|
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static void function_trace_start(struct trace_array *tr) |
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{ |
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tracing_reset_online_cpus(&tr->array_buffer); |
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} |
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|
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static void |
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function_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, struct ftrace_regs *fregs) |
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{ |
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struct trace_array *tr = op->private; |
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struct trace_array_cpu *data; |
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unsigned int trace_ctx; |
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int bit; |
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int cpu; |
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|
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if (unlikely(!tr->function_enabled)) |
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return; |
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bit = ftrace_test_recursion_trylock(ip, parent_ip); |
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if (bit < 0) |
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return; |
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trace_ctx = tracing_gen_ctx(); |
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|
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cpu = smp_processor_id(); |
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data = per_cpu_ptr(tr->array_buffer.data, cpu); |
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if (!atomic_read(&data->disabled)) |
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trace_function(tr, ip, parent_ip, trace_ctx); |
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|
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ftrace_test_recursion_unlock(bit); |
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} |
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|
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#ifdef CONFIG_UNWINDER_ORC |
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/* |
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* Skip 2: |
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* |
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* function_stack_trace_call() |
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* ftrace_call() |
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*/ |
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#define STACK_SKIP 2 |
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#else |
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/* |
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* Skip 3: |
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* __trace_stack() |
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* function_stack_trace_call() |
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* ftrace_call() |
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*/ |
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#define STACK_SKIP 3 |
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#endif |
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|
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static void |
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function_stack_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, struct ftrace_regs *fregs) |
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{ |
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struct trace_array *tr = op->private; |
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struct trace_array_cpu *data; |
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unsigned long flags; |
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long disabled; |
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int cpu; |
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unsigned int trace_ctx; |
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|
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if (unlikely(!tr->function_enabled)) |
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return; |
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|
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/* |
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* Need to use raw, since this must be called before the |
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* recursive protection is performed. |
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*/ |
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local_irq_save(flags); |
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cpu = raw_smp_processor_id(); |
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data = per_cpu_ptr(tr->array_buffer.data, cpu); |
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disabled = atomic_inc_return(&data->disabled); |
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|
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if (likely(disabled == 1)) { |
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trace_ctx = tracing_gen_ctx_flags(flags); |
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trace_function(tr, ip, parent_ip, trace_ctx); |
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__trace_stack(tr, trace_ctx, STACK_SKIP); |
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} |
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|
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atomic_dec(&data->disabled); |
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local_irq_restore(flags); |
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} |
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static inline bool is_repeat_check(struct trace_array *tr, |
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struct trace_func_repeats *last_info, |
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unsigned long ip, unsigned long parent_ip) |
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{ |
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if (last_info->ip == ip && |
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last_info->parent_ip == parent_ip && |
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last_info->count < U16_MAX) { |
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last_info->ts_last_call = |
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ring_buffer_time_stamp(tr->array_buffer.buffer); |
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last_info->count++; |
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return true; |
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} |
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|
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return false; |
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} |
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|
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static inline void process_repeats(struct trace_array *tr, |
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unsigned long ip, unsigned long parent_ip, |
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struct trace_func_repeats *last_info, |
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unsigned int trace_ctx) |
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{ |
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if (last_info->count) { |
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trace_last_func_repeats(tr, last_info, trace_ctx); |
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last_info->count = 0; |
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} |
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|
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last_info->ip = ip; |
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last_info->parent_ip = parent_ip; |
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} |
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static void |
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function_no_repeats_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, |
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struct ftrace_regs *fregs) |
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{ |
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struct trace_func_repeats *last_info; |
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struct trace_array *tr = op->private; |
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struct trace_array_cpu *data; |
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unsigned int trace_ctx; |
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unsigned long flags; |
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int bit; |
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int cpu; |
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|
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if (unlikely(!tr->function_enabled)) |
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return; |
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bit = ftrace_test_recursion_trylock(ip, parent_ip); |
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if (bit < 0) |
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return; |
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|
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cpu = smp_processor_id(); |
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data = per_cpu_ptr(tr->array_buffer.data, cpu); |
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if (atomic_read(&data->disabled)) |
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goto out; |
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|
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/* |
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* An interrupt may happen at any place here. But as far as I can see, |
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* the only damage that this can cause is to mess up the repetition |
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* counter without valuable data being lost. |
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* TODO: think about a solution that is better than just hoping to be |
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* lucky. |
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*/ |
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last_info = per_cpu_ptr(tr->last_func_repeats, cpu); |
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if (is_repeat_check(tr, last_info, ip, parent_ip)) |
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goto out; |
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|
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local_save_flags(flags); |
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trace_ctx = tracing_gen_ctx_flags(flags); |
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process_repeats(tr, ip, parent_ip, last_info, trace_ctx); |
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|
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trace_function(tr, ip, parent_ip, trace_ctx); |
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|
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out: |
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ftrace_test_recursion_unlock(bit); |
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} |
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|
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static void |
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function_stack_no_repeats_trace_call(unsigned long ip, unsigned long parent_ip, |
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struct ftrace_ops *op, |
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struct ftrace_regs *fregs) |
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{ |
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struct trace_func_repeats *last_info; |
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struct trace_array *tr = op->private; |
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struct trace_array_cpu *data; |
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unsigned long flags; |
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long disabled; |
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int cpu; |
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unsigned int trace_ctx; |
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|
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if (unlikely(!tr->function_enabled)) |
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return; |
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|
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/* |
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* Need to use raw, since this must be called before the |
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* recursive protection is performed. |
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*/ |
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local_irq_save(flags); |
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cpu = raw_smp_processor_id(); |
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data = per_cpu_ptr(tr->array_buffer.data, cpu); |
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disabled = atomic_inc_return(&data->disabled); |
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|
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if (likely(disabled == 1)) { |
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last_info = per_cpu_ptr(tr->last_func_repeats, cpu); |
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if (is_repeat_check(tr, last_info, ip, parent_ip)) |
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goto out; |
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trace_ctx = tracing_gen_ctx_flags(flags); |
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process_repeats(tr, ip, parent_ip, last_info, trace_ctx); |
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|
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trace_function(tr, ip, parent_ip, trace_ctx); |
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__trace_stack(tr, trace_ctx, STACK_SKIP); |
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} |
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|
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out: |
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atomic_dec(&data->disabled); |
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local_irq_restore(flags); |
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} |
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|
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static struct tracer_opt func_opts[] = { |
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#ifdef CONFIG_STACKTRACE |
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{ TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) }, |
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#endif |
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{ TRACER_OPT(func-no-repeats, TRACE_FUNC_OPT_NO_REPEATS) }, |
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{ } /* Always set a last empty entry */ |
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}; |
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|
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static struct tracer_flags func_flags = { |
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.val = TRACE_FUNC_NO_OPTS, /* By default: all flags disabled */ |
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.opts = func_opts |
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}; |
|
|
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static void tracing_start_function_trace(struct trace_array *tr) |
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{ |
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tr->function_enabled = 0; |
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register_ftrace_function(tr->ops); |
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tr->function_enabled = 1; |
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} |
|
|
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static void tracing_stop_function_trace(struct trace_array *tr) |
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{ |
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tr->function_enabled = 0; |
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unregister_ftrace_function(tr->ops); |
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} |
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|
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static struct tracer function_trace; |
|
|
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static int |
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func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) |
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{ |
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ftrace_func_t func; |
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u32 new_flags; |
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|
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/* Do nothing if already set. */ |
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if (!!set == !!(func_flags.val & bit)) |
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return 0; |
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|
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/* We can change this flag only when not running. */ |
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if (tr->current_trace != &function_trace) |
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return 0; |
|
|
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new_flags = (func_flags.val & ~bit) | (set ? bit : 0); |
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func = select_trace_function(new_flags); |
|
if (!func) |
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return -EINVAL; |
|
|
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/* Check if there's anything to change. */ |
|
if (tr->ops->func == func) |
|
return 0; |
|
|
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if (!handle_func_repeats(tr, new_flags)) |
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return -ENOMEM; |
|
|
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unregister_ftrace_function(tr->ops); |
|
tr->ops->func = func; |
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register_ftrace_function(tr->ops); |
|
|
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return 0; |
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} |
|
|
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static struct tracer function_trace __tracer_data = |
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{ |
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.name = "function", |
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.init = function_trace_init, |
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.reset = function_trace_reset, |
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.start = function_trace_start, |
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.flags = &func_flags, |
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.set_flag = func_set_flag, |
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.allow_instances = true, |
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#ifdef CONFIG_FTRACE_SELFTEST |
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.selftest = trace_selftest_startup_function, |
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#endif |
|
}; |
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE |
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static void update_traceon_count(struct ftrace_probe_ops *ops, |
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unsigned long ip, |
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struct trace_array *tr, bool on, |
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void *data) |
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{ |
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struct ftrace_func_mapper *mapper = data; |
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long *count; |
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long old_count; |
|
|
|
/* |
|
* Tracing gets disabled (or enabled) once per count. |
|
* This function can be called at the same time on multiple CPUs. |
|
* It is fine if both disable (or enable) tracing, as disabling |
|
* (or enabling) the second time doesn't do anything as the |
|
* state of the tracer is already disabled (or enabled). |
|
* What needs to be synchronized in this case is that the count |
|
* only gets decremented once, even if the tracer is disabled |
|
* (or enabled) twice, as the second one is really a nop. |
|
* |
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* The memory barriers guarantee that we only decrement the |
|
* counter once. First the count is read to a local variable |
|
* and a read barrier is used to make sure that it is loaded |
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* before checking if the tracer is in the state we want. |
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* If the tracer is not in the state we want, then the count |
|
* is guaranteed to be the old count. |
|
* |
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* Next the tracer is set to the state we want (disabled or enabled) |
|
* then a write memory barrier is used to make sure that |
|
* the new state is visible before changing the counter by |
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* one minus the old counter. This guarantees that another CPU |
|
* executing this code will see the new state before seeing |
|
* the new counter value, and would not do anything if the new |
|
* counter is seen. |
|
* |
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* Note, there is no synchronization between this and a user |
|
* setting the tracing_on file. But we currently don't care |
|
* about that. |
|
*/ |
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count = (long *)ftrace_func_mapper_find_ip(mapper, ip); |
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old_count = *count; |
|
|
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if (old_count <= 0) |
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return; |
|
|
|
/* Make sure we see count before checking tracing state */ |
|
smp_rmb(); |
|
|
|
if (on == !!tracer_tracing_is_on(tr)) |
|
return; |
|
|
|
if (on) |
|
tracer_tracing_on(tr); |
|
else |
|
tracer_tracing_off(tr); |
|
|
|
/* Make sure tracing state is visible before updating count */ |
|
smp_wmb(); |
|
|
|
*count = old_count - 1; |
|
} |
|
|
|
static void |
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ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
update_traceon_count(ops, ip, tr, 1, data); |
|
} |
|
|
|
static void |
|
ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
update_traceon_count(ops, ip, tr, 0, data); |
|
} |
|
|
|
static void |
|
ftrace_traceon(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
if (tracer_tracing_is_on(tr)) |
|
return; |
|
|
|
tracer_tracing_on(tr); |
|
} |
|
|
|
static void |
|
ftrace_traceoff(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
if (!tracer_tracing_is_on(tr)) |
|
return; |
|
|
|
tracer_tracing_off(tr); |
|
} |
|
|
|
#ifdef CONFIG_UNWINDER_ORC |
|
/* |
|
* Skip 3: |
|
* |
|
* function_trace_probe_call() |
|
* ftrace_ops_assist_func() |
|
* ftrace_call() |
|
*/ |
|
#define FTRACE_STACK_SKIP 3 |
|
#else |
|
/* |
|
* Skip 5: |
|
* |
|
* __trace_stack() |
|
* ftrace_stacktrace() |
|
* function_trace_probe_call() |
|
* ftrace_ops_assist_func() |
|
* ftrace_call() |
|
*/ |
|
#define FTRACE_STACK_SKIP 5 |
|
#endif |
|
|
|
static __always_inline void trace_stack(struct trace_array *tr) |
|
{ |
|
unsigned int trace_ctx; |
|
|
|
trace_ctx = tracing_gen_ctx(); |
|
|
|
__trace_stack(tr, trace_ctx, FTRACE_STACK_SKIP); |
|
} |
|
|
|
static void |
|
ftrace_stacktrace(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
trace_stack(tr); |
|
} |
|
|
|
static void |
|
ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
struct ftrace_func_mapper *mapper = data; |
|
long *count; |
|
long old_count; |
|
long new_count; |
|
|
|
if (!tracing_is_on()) |
|
return; |
|
|
|
/* unlimited? */ |
|
if (!mapper) { |
|
trace_stack(tr); |
|
return; |
|
} |
|
|
|
count = (long *)ftrace_func_mapper_find_ip(mapper, ip); |
|
|
|
/* |
|
* Stack traces should only execute the number of times the |
|
* user specified in the counter. |
|
*/ |
|
do { |
|
old_count = *count; |
|
|
|
if (!old_count) |
|
return; |
|
|
|
new_count = old_count - 1; |
|
new_count = cmpxchg(count, old_count, new_count); |
|
if (new_count == old_count) |
|
trace_stack(tr); |
|
|
|
if (!tracing_is_on()) |
|
return; |
|
|
|
} while (new_count != old_count); |
|
} |
|
|
|
static int update_count(struct ftrace_probe_ops *ops, unsigned long ip, |
|
void *data) |
|
{ |
|
struct ftrace_func_mapper *mapper = data; |
|
long *count = NULL; |
|
|
|
if (mapper) |
|
count = (long *)ftrace_func_mapper_find_ip(mapper, ip); |
|
|
|
if (count) { |
|
if (*count <= 0) |
|
return 0; |
|
(*count)--; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static void |
|
ftrace_dump_probe(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
if (update_count(ops, ip, data)) |
|
ftrace_dump(DUMP_ALL); |
|
} |
|
|
|
/* Only dump the current CPU buffer. */ |
|
static void |
|
ftrace_cpudump_probe(unsigned long ip, unsigned long parent_ip, |
|
struct trace_array *tr, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
if (update_count(ops, ip, data)) |
|
ftrace_dump(DUMP_ORIG); |
|
} |
|
|
|
static int |
|
ftrace_probe_print(const char *name, struct seq_file *m, |
|
unsigned long ip, struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
struct ftrace_func_mapper *mapper = data; |
|
long *count = NULL; |
|
|
|
seq_printf(m, "%ps:%s", (void *)ip, name); |
|
|
|
if (mapper) |
|
count = (long *)ftrace_func_mapper_find_ip(mapper, ip); |
|
|
|
if (count) |
|
seq_printf(m, ":count=%ld\n", *count); |
|
else |
|
seq_puts(m, ":unlimited\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
ftrace_traceon_print(struct seq_file *m, unsigned long ip, |
|
struct ftrace_probe_ops *ops, |
|
void *data) |
|
{ |
|
return ftrace_probe_print("traceon", m, ip, ops, data); |
|
} |
|
|
|
static int |
|
ftrace_traceoff_print(struct seq_file *m, unsigned long ip, |
|
struct ftrace_probe_ops *ops, void *data) |
|
{ |
|
return ftrace_probe_print("traceoff", m, ip, ops, data); |
|
} |
|
|
|
static int |
|
ftrace_stacktrace_print(struct seq_file *m, unsigned long ip, |
|
struct ftrace_probe_ops *ops, void *data) |
|
{ |
|
return ftrace_probe_print("stacktrace", m, ip, ops, data); |
|
} |
|
|
|
static int |
|
ftrace_dump_print(struct seq_file *m, unsigned long ip, |
|
struct ftrace_probe_ops *ops, void *data) |
|
{ |
|
return ftrace_probe_print("dump", m, ip, ops, data); |
|
} |
|
|
|
static int |
|
ftrace_cpudump_print(struct seq_file *m, unsigned long ip, |
|
struct ftrace_probe_ops *ops, void *data) |
|
{ |
|
return ftrace_probe_print("cpudump", m, ip, ops, data); |
|
} |
|
|
|
|
|
static int |
|
ftrace_count_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
|
unsigned long ip, void *init_data, void **data) |
|
{ |
|
struct ftrace_func_mapper *mapper = *data; |
|
|
|
if (!mapper) { |
|
mapper = allocate_ftrace_func_mapper(); |
|
if (!mapper) |
|
return -ENOMEM; |
|
*data = mapper; |
|
} |
|
|
|
return ftrace_func_mapper_add_ip(mapper, ip, init_data); |
|
} |
|
|
|
static void |
|
ftrace_count_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
|
unsigned long ip, void *data) |
|
{ |
|
struct ftrace_func_mapper *mapper = data; |
|
|
|
if (!ip) { |
|
free_ftrace_func_mapper(mapper, NULL); |
|
return; |
|
} |
|
|
|
ftrace_func_mapper_remove_ip(mapper, ip); |
|
} |
|
|
|
static struct ftrace_probe_ops traceon_count_probe_ops = { |
|
.func = ftrace_traceon_count, |
|
.print = ftrace_traceon_print, |
|
.init = ftrace_count_init, |
|
.free = ftrace_count_free, |
|
}; |
|
|
|
static struct ftrace_probe_ops traceoff_count_probe_ops = { |
|
.func = ftrace_traceoff_count, |
|
.print = ftrace_traceoff_print, |
|
.init = ftrace_count_init, |
|
.free = ftrace_count_free, |
|
}; |
|
|
|
static struct ftrace_probe_ops stacktrace_count_probe_ops = { |
|
.func = ftrace_stacktrace_count, |
|
.print = ftrace_stacktrace_print, |
|
.init = ftrace_count_init, |
|
.free = ftrace_count_free, |
|
}; |
|
|
|
static struct ftrace_probe_ops dump_probe_ops = { |
|
.func = ftrace_dump_probe, |
|
.print = ftrace_dump_print, |
|
.init = ftrace_count_init, |
|
.free = ftrace_count_free, |
|
}; |
|
|
|
static struct ftrace_probe_ops cpudump_probe_ops = { |
|
.func = ftrace_cpudump_probe, |
|
.print = ftrace_cpudump_print, |
|
}; |
|
|
|
static struct ftrace_probe_ops traceon_probe_ops = { |
|
.func = ftrace_traceon, |
|
.print = ftrace_traceon_print, |
|
}; |
|
|
|
static struct ftrace_probe_ops traceoff_probe_ops = { |
|
.func = ftrace_traceoff, |
|
.print = ftrace_traceoff_print, |
|
}; |
|
|
|
static struct ftrace_probe_ops stacktrace_probe_ops = { |
|
.func = ftrace_stacktrace, |
|
.print = ftrace_stacktrace_print, |
|
}; |
|
|
|
static int |
|
ftrace_trace_probe_callback(struct trace_array *tr, |
|
struct ftrace_probe_ops *ops, |
|
struct ftrace_hash *hash, char *glob, |
|
char *cmd, char *param, int enable) |
|
{ |
|
void *count = (void *)-1; |
|
char *number; |
|
int ret; |
|
|
|
/* hash funcs only work with set_ftrace_filter */ |
|
if (!enable) |
|
return -EINVAL; |
|
|
|
if (glob[0] == '!') |
|
return unregister_ftrace_function_probe_func(glob+1, tr, ops); |
|
|
|
if (!param) |
|
goto out_reg; |
|
|
|
number = strsep(¶m, ":"); |
|
|
|
if (!strlen(number)) |
|
goto out_reg; |
|
|
|
/* |
|
* We use the callback data field (which is a pointer) |
|
* as our counter. |
|
*/ |
|
ret = kstrtoul(number, 0, (unsigned long *)&count); |
|
if (ret) |
|
return ret; |
|
|
|
out_reg: |
|
ret = register_ftrace_function_probe(glob, tr, ops, count); |
|
|
|
return ret < 0 ? ret : 0; |
|
} |
|
|
|
static int |
|
ftrace_trace_onoff_callback(struct trace_array *tr, struct ftrace_hash *hash, |
|
char *glob, char *cmd, char *param, int enable) |
|
{ |
|
struct ftrace_probe_ops *ops; |
|
|
|
if (!tr) |
|
return -ENODEV; |
|
|
|
/* we register both traceon and traceoff to this callback */ |
|
if (strcmp(cmd, "traceon") == 0) |
|
ops = param ? &traceon_count_probe_ops : &traceon_probe_ops; |
|
else |
|
ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops; |
|
|
|
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
|
param, enable); |
|
} |
|
|
|
static int |
|
ftrace_stacktrace_callback(struct trace_array *tr, struct ftrace_hash *hash, |
|
char *glob, char *cmd, char *param, int enable) |
|
{ |
|
struct ftrace_probe_ops *ops; |
|
|
|
if (!tr) |
|
return -ENODEV; |
|
|
|
ops = param ? &stacktrace_count_probe_ops : &stacktrace_probe_ops; |
|
|
|
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
|
param, enable); |
|
} |
|
|
|
static int |
|
ftrace_dump_callback(struct trace_array *tr, struct ftrace_hash *hash, |
|
char *glob, char *cmd, char *param, int enable) |
|
{ |
|
struct ftrace_probe_ops *ops; |
|
|
|
if (!tr) |
|
return -ENODEV; |
|
|
|
ops = &dump_probe_ops; |
|
|
|
/* Only dump once. */ |
|
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
|
"1", enable); |
|
} |
|
|
|
static int |
|
ftrace_cpudump_callback(struct trace_array *tr, struct ftrace_hash *hash, |
|
char *glob, char *cmd, char *param, int enable) |
|
{ |
|
struct ftrace_probe_ops *ops; |
|
|
|
if (!tr) |
|
return -ENODEV; |
|
|
|
ops = &cpudump_probe_ops; |
|
|
|
/* Only dump once. */ |
|
return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
|
"1", enable); |
|
} |
|
|
|
static struct ftrace_func_command ftrace_traceon_cmd = { |
|
.name = "traceon", |
|
.func = ftrace_trace_onoff_callback, |
|
}; |
|
|
|
static struct ftrace_func_command ftrace_traceoff_cmd = { |
|
.name = "traceoff", |
|
.func = ftrace_trace_onoff_callback, |
|
}; |
|
|
|
static struct ftrace_func_command ftrace_stacktrace_cmd = { |
|
.name = "stacktrace", |
|
.func = ftrace_stacktrace_callback, |
|
}; |
|
|
|
static struct ftrace_func_command ftrace_dump_cmd = { |
|
.name = "dump", |
|
.func = ftrace_dump_callback, |
|
}; |
|
|
|
static struct ftrace_func_command ftrace_cpudump_cmd = { |
|
.name = "cpudump", |
|
.func = ftrace_cpudump_callback, |
|
}; |
|
|
|
static int __init init_func_cmd_traceon(void) |
|
{ |
|
int ret; |
|
|
|
ret = register_ftrace_command(&ftrace_traceoff_cmd); |
|
if (ret) |
|
return ret; |
|
|
|
ret = register_ftrace_command(&ftrace_traceon_cmd); |
|
if (ret) |
|
goto out_free_traceoff; |
|
|
|
ret = register_ftrace_command(&ftrace_stacktrace_cmd); |
|
if (ret) |
|
goto out_free_traceon; |
|
|
|
ret = register_ftrace_command(&ftrace_dump_cmd); |
|
if (ret) |
|
goto out_free_stacktrace; |
|
|
|
ret = register_ftrace_command(&ftrace_cpudump_cmd); |
|
if (ret) |
|
goto out_free_dump; |
|
|
|
return 0; |
|
|
|
out_free_dump: |
|
unregister_ftrace_command(&ftrace_dump_cmd); |
|
out_free_stacktrace: |
|
unregister_ftrace_command(&ftrace_stacktrace_cmd); |
|
out_free_traceon: |
|
unregister_ftrace_command(&ftrace_traceon_cmd); |
|
out_free_traceoff: |
|
unregister_ftrace_command(&ftrace_traceoff_cmd); |
|
|
|
return ret; |
|
} |
|
#else |
|
static inline int init_func_cmd_traceon(void) |
|
{ |
|
return 0; |
|
} |
|
#endif /* CONFIG_DYNAMIC_FTRACE */ |
|
|
|
__init int init_function_trace(void) |
|
{ |
|
init_func_cmd_traceon(); |
|
return register_tracer(&function_trace); |
|
}
|
|
|