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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/lib/traceevent/plugins/plugin_function.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/lib/traceevent/plugins/plugin_function.c')
-rw-r--r-- | tools/lib/traceevent/plugins/plugin_function.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/tools/lib/traceevent/plugins/plugin_function.c b/tools/lib/traceevent/plugins/plugin_function.c new file mode 100644 index 000000000..807b16e1b --- /dev/null +++ b/tools/lib/traceevent/plugins/plugin_function.c @@ -0,0 +1,282 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> + */ +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "event-parse.h" +#include "event-utils.h" +#include "trace-seq.h" + +static struct func_stack { + int size; + char **stack; +} *fstack; + +static int cpus = -1; + +#define STK_BLK 10 + +struct tep_plugin_option plugin_options[] = +{ + { + .name = "parent", + .plugin_alias = "ftrace", + .description = + "Print parent of functions for function events", + }, + { + .name = "indent", + .plugin_alias = "ftrace", + .description = + "Try to show function call indents, based on parents", + .set = 1, + }, + { + .name = "offset", + .plugin_alias = "ftrace", + .description = + "Show function names as well as their offsets", + .set = 0, + }, + { + .name = NULL, + } +}; + +static struct tep_plugin_option *ftrace_parent = &plugin_options[0]; +static struct tep_plugin_option *ftrace_indent = &plugin_options[1]; +static struct tep_plugin_option *ftrace_offset = &plugin_options[2]; + +static void add_child(struct func_stack *stack, const char *child, int pos) +{ + int i; + + if (!child) + return; + + if (pos < stack->size) + free(stack->stack[pos]); + else { + char **ptr; + + ptr = realloc(stack->stack, sizeof(char *) * + (stack->size + STK_BLK)); + if (!ptr) { + warning("could not allocate plugin memory\n"); + return; + } + + stack->stack = ptr; + + for (i = stack->size; i < stack->size + STK_BLK; i++) + stack->stack[i] = NULL; + stack->size += STK_BLK; + } + + stack->stack[pos] = strdup(child); +} + +static int add_and_get_index(const char *parent, const char *child, int cpu) +{ + int i; + + if (cpu < 0) + return 0; + + if (cpu > cpus) { + struct func_stack *ptr; + + ptr = realloc(fstack, sizeof(*fstack) * (cpu + 1)); + if (!ptr) { + warning("could not allocate plugin memory\n"); + return 0; + } + + fstack = ptr; + + /* Account for holes in the cpu count */ + for (i = cpus + 1; i <= cpu; i++) + memset(&fstack[i], 0, sizeof(fstack[i])); + cpus = cpu; + } + + for (i = 0; i < fstack[cpu].size && fstack[cpu].stack[i]; i++) { + if (strcmp(parent, fstack[cpu].stack[i]) == 0) { + add_child(&fstack[cpu], child, i+1); + return i; + } + } + + /* Not found */ + add_child(&fstack[cpu], parent, 0); + add_child(&fstack[cpu], child, 1); + return 0; +} + +static void show_function(struct trace_seq *s, struct tep_handle *tep, + const char *func, unsigned long long function) +{ + unsigned long long offset; + + trace_seq_printf(s, "%s", func); + if (ftrace_offset->set) { + offset = tep_find_function_address(tep, function); + trace_seq_printf(s, "+0x%x ", (int)(function - offset)); + } +} + +static int function_handler(struct trace_seq *s, struct tep_record *record, + struct tep_event *event, void *context) +{ + struct tep_handle *tep = event->tep; + unsigned long long function; + unsigned long long pfunction; + const char *func; + const char *parent; + int index = 0; + + if (tep_get_field_val(s, event, "ip", record, &function, 1)) + return trace_seq_putc(s, '!'); + + func = tep_find_function(tep, function); + + if (tep_get_field_val(s, event, "parent_ip", record, &pfunction, 1)) + return trace_seq_putc(s, '!'); + + parent = tep_find_function(tep, pfunction); + + if (parent && ftrace_indent->set) + index = add_and_get_index(parent, func, record->cpu); + + trace_seq_printf(s, "%*s", index*3, ""); + + if (func) + show_function(s, tep, func, function); + else + trace_seq_printf(s, "0x%llx", function); + + if (ftrace_parent->set) { + trace_seq_printf(s, " <-- "); + if (parent) + show_function(s, tep, parent, pfunction); + else + trace_seq_printf(s, "0x%llx", pfunction); + } + + return 0; +} + +static int +trace_stack_handler(struct trace_seq *s, struct tep_record *record, + struct tep_event *event, void *context) +{ + struct tep_format_field *field; + unsigned long long addr; + const char *func; + int long_size; + void *data = record->data; + + field = tep_find_any_field(event, "caller"); + if (!field) { + trace_seq_printf(s, "<CANT FIND FIELD %s>", "caller"); + return 0; + } + + trace_seq_puts(s, "<stack trace >\n"); + + long_size = tep_get_long_size(event->tep); + + for (data += field->offset; data < record->data + record->size; + data += long_size) { + addr = tep_read_number(event->tep, data, long_size); + + if ((long_size == 8 && addr == (unsigned long long)-1) || + ((int)addr == -1)) + break; + + func = tep_find_function(event->tep, addr); + if (func) + trace_seq_printf(s, "=> %s (%llx)\n", func, addr); + else + trace_seq_printf(s, "=> %llx\n", addr); + } + + return 0; +} + +static int +trace_raw_data_handler(struct trace_seq *s, struct tep_record *record, + struct tep_event *event, void *context) +{ + struct tep_format_field *field; + unsigned long long id; + int long_size; + void *data = record->data; + + if (tep_get_field_val(s, event, "id", record, &id, 1)) + return trace_seq_putc(s, '!'); + + trace_seq_printf(s, "# %llx", id); + + field = tep_find_any_field(event, "buf"); + if (!field) { + trace_seq_printf(s, "<CANT FIND FIELD %s>", "buf"); + return 0; + } + + long_size = tep_get_long_size(event->tep); + + for (data += field->offset; data < record->data + record->size; + data += long_size) { + int size = sizeof(long); + int left = (record->data + record->size) - data; + int i; + + if (size > left) + size = left; + + for (i = 0; i < size; i++) + trace_seq_printf(s, " %02x", *(unsigned char *)(data + i)); + } + + return 0; +} + +int TEP_PLUGIN_LOADER(struct tep_handle *tep) +{ + tep_register_event_handler(tep, -1, "ftrace", "function", + function_handler, NULL); + + tep_register_event_handler(tep, -1, "ftrace", "kernel_stack", + trace_stack_handler, NULL); + + tep_register_event_handler(tep, -1, "ftrace", "raw_data", + trace_raw_data_handler, NULL); + + tep_plugin_add_options("ftrace", plugin_options); + + return 0; +} + +void TEP_PLUGIN_UNLOADER(struct tep_handle *tep) +{ + int i, x; + + tep_unregister_event_handler(tep, -1, "ftrace", "function", + function_handler, NULL); + + for (i = 0; i <= cpus; i++) { + for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++) + free(fstack[i].stack[x]); + free(fstack[i].stack); + } + + tep_plugin_remove_options(plugin_options); + + free(fstack); + fstack = NULL; + cpus = -1; +} |