diff options
Diffstat (limited to 'tools/perf/util/probe-event.c')
| -rw-r--r-- | tools/perf/util/probe-event.c | 189 |
1 files changed, 148 insertions, 41 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index fcc16e4349df..3b6a5297bf16 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -74,10 +74,9 @@ static int e_snprintf(char *str, size_t size, const char *format, ...) static char *synthesize_perf_probe_point(struct perf_probe_point *pp); static struct machine machine; -/* Initialize symbol maps and path of vmlinux */ +/* Initialize symbol maps and path of vmlinux/modules */ static int init_vmlinux(void) { - struct dso *kernel; int ret; symbol_conf.sort_by_name = true; @@ -91,33 +90,61 @@ static int init_vmlinux(void) goto out; } - ret = machine__init(&machine, "/", 0); + ret = machine__init(&machine, "", HOST_KERNEL_ID); if (ret < 0) goto out; - kernel = dso__new_kernel(symbol_conf.vmlinux_name); - if (kernel == NULL) - die("Failed to create kernel dso."); - - ret = __machine__create_kernel_maps(&machine, kernel); - if (ret < 0) - pr_debug("Failed to create kernel maps.\n"); - + if (machine__create_kernel_maps(&machine) < 0) { + pr_debug("machine__create_kernel_maps "); + goto out; + } out: if (ret < 0) pr_warning("Failed to init vmlinux path.\n"); return ret; } +static struct symbol *__find_kernel_function_by_name(const char *name, + struct map **mapp) +{ + return machine__find_kernel_function_by_name(&machine, name, mapp, + NULL); +} + +const char *kernel_get_module_path(const char *module) +{ + struct dso *dso; + + if (module) { + list_for_each_entry(dso, &machine.kernel_dsos, node) { + if (strncmp(dso->short_name + 1, module, + dso->short_name_len - 2) == 0) + goto found; + } + pr_debug("Failed to find module %s.\n", module); + return NULL; + } else { + dso = machine.vmlinux_maps[MAP__FUNCTION]->dso; + if (dso__load_vmlinux_path(dso, + machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) { + pr_debug("Failed to load kernel map.\n"); + return NULL; + } + } +found: + return dso->long_name; +} + #ifdef DWARF_SUPPORT -static int open_vmlinux(void) +static int open_vmlinux(const char *module) { - if (map__load(machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) { - pr_debug("Failed to load kernel map.\n"); - return -EINVAL; + const char *path = kernel_get_module_path(module); + if (!path) { + pr_err("Failed to find path of %s module", module ?: "kernel"); + return -ENOENT; } - pr_debug("Try to open %s\n", machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name); - return open(machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name, O_RDONLY); + pr_debug("Try to open %s\n", path); + return open(path, O_RDONLY); } /* @@ -125,20 +152,19 @@ static int open_vmlinux(void) * Currently only handles kprobes. */ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, - struct perf_probe_point *pp) + struct perf_probe_point *pp) { struct symbol *sym; - int fd, ret = -ENOENT; + struct map *map; + u64 addr; + int ret = -ENOENT; - sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION], - tp->symbol, NULL); + sym = __find_kernel_function_by_name(tp->symbol, &map); if (sym) { - fd = open_vmlinux(); - if (fd >= 0) { - ret = find_perf_probe_point(fd, - sym->start + tp->offset, pp); - close(fd); - } + addr = map->unmap_ip(map, sym->start + tp->offset); + pr_debug("try to find %s+%ld@%llx\n", tp->symbol, + tp->offset, addr); + ret = find_perf_probe_point((unsigned long)addr, pp); } if (ret <= 0) { pr_debug("Failed to find corresponding probes from " @@ -156,12 +182,12 @@ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, /* Try to find perf_probe_event with debuginfo */ static int try_to_find_probe_trace_events(struct perf_probe_event *pev, struct probe_trace_event **tevs, - int max_tevs) + int max_tevs, const char *module) { bool need_dwarf = perf_probe_event_need_dwarf(pev); int fd, ntevs; - fd = open_vmlinux(); + fd = open_vmlinux(module); if (fd < 0) { if (need_dwarf) { pr_warning("Failed to open debuginfo file.\n"); @@ -300,7 +326,7 @@ error: * Show line-range always requires debuginfo to find source file and * line number. */ -int show_line_range(struct line_range *lr) +int show_line_range(struct line_range *lr, const char *module) { int l = 1; struct line_node *ln; @@ -313,7 +339,7 @@ int show_line_range(struct line_range *lr) if (ret < 0) return ret; - fd = open_vmlinux(); + fd = open_vmlinux(module); if (fd < 0) { pr_warning("Failed to open debuginfo file.\n"); return fd; @@ -378,11 +404,84 @@ end: return ret; } +static int show_available_vars_at(int fd, struct perf_probe_event *pev, + int max_vls, bool externs) +{ + char *buf; + int ret, i; + struct str_node *node; + struct variable_list *vls = NULL, *vl; + + buf = synthesize_perf_probe_point(&pev->point); + if (!buf) + return -EINVAL; + pr_debug("Searching variables at %s\n", buf); + + ret = find_available_vars_at(fd, pev, &vls, max_vls, externs); + if (ret > 0) { + /* Some variables were found */ + fprintf(stdout, "Available variables at %s\n", buf); + for (i = 0; i < ret; i++) { + vl = &vls[i]; + /* + * A probe point might be converted to + * several trace points. + */ + fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol, + vl->point.offset); + free(vl->point.symbol); + if (vl->vars) { + strlist__for_each(node, vl->vars) + fprintf(stdout, "\t\t%s\n", node->s); + strlist__delete(vl->vars); + } else + fprintf(stdout, "(No variables)\n"); + } + free(vls); + } else + pr_err("Failed to find variables at %s (%d)\n", buf, ret); + + free(buf); + return ret; +} + +/* Show available variables on given probe point */ +int show_available_vars(struct perf_probe_event *pevs, int npevs, + int max_vls, const char *module, bool externs) +{ + int i, fd, ret = 0; + + ret = init_vmlinux(); + if (ret < 0) + return ret; + + fd = open_vmlinux(module); + if (fd < 0) { + pr_warning("Failed to open debuginfo file.\n"); + return fd; + } + + setup_pager(); + + for (i = 0; i < npevs && ret >= 0; i++) + ret = show_available_vars_at(fd, &pevs[i], max_vls, externs); + + close(fd); + return ret; +} + #else /* !DWARF_SUPPORT */ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, - struct perf_probe_point *pp) + struct perf_probe_point *pp) { + struct symbol *sym; + + sym = __find_kernel_function_by_name(tp->symbol, NULL); + if (!sym) { + pr_err("Failed to find symbol %s in kernel.\n", tp->symbol); + return -ENOENT; + } pp->function = strdup(tp->symbol); if (pp->function == NULL) return -ENOMEM; @@ -394,7 +493,7 @@ static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp, static int try_to_find_probe_trace_events(struct perf_probe_event *pev, struct probe_trace_event **tevs __unused, - int max_tevs __unused) + int max_tevs __unused, const char *mod __unused) { if (perf_probe_event_need_dwarf(pev)) { pr_warning("Debuginfo-analysis is not supported.\n"); @@ -403,12 +502,19 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev, return 0; } -int show_line_range(struct line_range *lr __unused) +int show_line_range(struct line_range *lr __unused, const char *module __unused) { pr_warning("Debuginfo-analysis is not supported.\n"); return -ENOSYS; } +int show_available_vars(struct perf_probe_event *pevs __unused, + int npevs __unused, int max_vls __unused, + const char *module __unused, bool externs __unused) +{ + pr_warning("Debuginfo-analysis is not supported.\n"); + return -ENOSYS; +} #endif int parse_line_range_desc(const char *arg, struct line_range *lr) @@ -1087,7 +1193,7 @@ error: } static int convert_to_perf_probe_event(struct probe_trace_event *tev, - struct perf_probe_event *pev) + struct perf_probe_event *pev) { char buf[64] = ""; int i, ret; @@ -1516,14 +1622,14 @@ static int __add_probe_trace_events(struct perf_probe_event *pev, static int convert_to_probe_trace_events(struct perf_probe_event *pev, struct probe_trace_event **tevs, - int max_tevs) + int max_tevs, const char *module) { struct symbol *sym; int ret = 0, i; struct probe_trace_event *tev; /* Convert perf_probe_event with debuginfo */ - ret = try_to_find_probe_trace_events(pev, tevs, max_tevs); + ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module); if (ret != 0) return ret; @@ -1572,8 +1678,7 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev, } /* Currently just checking function name from symbol map */ - sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION], - tev->point.symbol, NULL); + sym = __find_kernel_function_by_name(tev->point.symbol, NULL); if (!sym) { pr_warning("Kernel symbol \'%s\' not found.\n", tev->point.symbol); @@ -1596,7 +1701,7 @@ struct __event_package { }; int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, - bool force_add, int max_tevs) + int max_tevs, const char *module, bool force_add) { int i, j, ret; struct __event_package *pkgs; @@ -1617,7 +1722,9 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, pkgs[i].pev = &pevs[i]; /* Convert with or without debuginfo */ ret = convert_to_probe_trace_events(pkgs[i].pev, - &pkgs[i].tevs, max_tevs); + &pkgs[i].tevs, + max_tevs, + module); if (ret < 0) goto end; pkgs[i].ntevs = ret; |