diff options
Diffstat (limited to 'kernel/trace/trace_boot.c')
| -rw-r--r-- | kernel/trace/trace_boot.c | 102 |
1 files changed, 100 insertions, 2 deletions
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c index dbe29b4c6a7a..5da0a8bbb110 100644 --- a/kernel/trace/trace_boot.c +++ b/kernel/trace/trace_boot.c @@ -18,6 +18,7 @@ #include <linux/trace_events.h> #include "trace.h" +#include "trace_dynevent.h" #define MAX_BUF_LEN 256 @@ -61,7 +62,8 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node) v = memparse(p, NULL); if (v < PAGE_SIZE) pr_err("Buffer size is too small: %s\n", p); - if (tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0) + if (trace_array_is_readonly(tr) || + tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0) pr_err("Failed to resize trace buffer to %s\n", p); } @@ -171,6 +173,93 @@ trace_boot_add_synth_event(struct xbc_node *node, const char *event) } #endif +#if defined(CONFIG_EPROBE_EVENTS) || defined(CONFIG_FPROBE_EVENTS) +static int __init +trace_boot_add_probe_event(struct xbc_node *node, const char *group, + const char *event, char type, const char *type_name) +{ + struct xbc_node *anode; + char buf[MAX_BUF_LEN]; + const char *val; + int ret = 0; + + xbc_node_for_each_array_value(node, "probes", anode, val) { + if (val[0] == type && (val[1] == ':' || isspace(val[1]))) { + ret = strscpy(buf, val, MAX_BUF_LEN); + if (ret < 0) { + pr_err("%s command is too long: %s\n", type_name, val); + break; + } + } else { + ret = snprintf(buf, MAX_BUF_LEN, "%c:%s/%s %s", type, group, event, val); + if (ret >= MAX_BUF_LEN || ret < 0) { + pr_err("%s command is too long: %c:%s/%s %s\n", + type_name, type, group, event, val); + ret = -E2BIG; + break; + } + } + + ret = dyn_event_create(buf, NULL); + if (ret) { + pr_err("Failed to add %s: %s\n", type_name, buf); + break; + } + } + + return ret; +} +#endif + +#ifdef CONFIG_EPROBE_EVENTS +static inline int __init +trace_boot_add_eprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + return trace_boot_add_probe_event(node, group, event, 'e', "eprobe"); +} +#else +static inline int __init +trace_boot_add_eprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + pr_err("Event probe is not supported.\n"); + return -EOPNOTSUPP; +} +#endif + +#ifdef CONFIG_FPROBE_EVENTS +static inline int __init +trace_boot_add_fprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + return trace_boot_add_probe_event(node, group, event, 'f', "fprobe"); +} + +static inline int __init +trace_boot_add_tprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + return trace_boot_add_probe_event(node, group, event, 't', "tprobe"); +} +#else +static inline int __init +trace_boot_add_fprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + pr_err("Fprobe event is not supported.\n"); + return -EOPNOTSUPP; +} + +static inline int __init +trace_boot_add_tprobe_event(struct xbc_node *node, const char *group, + const char *event) +{ + pr_err("Tracepoint probe is not supported.\n"); + return -EOPNOTSUPP; +} +#endif + #ifdef CONFIG_HIST_TRIGGERS static int __init __printf(3, 4) append_printf(char **bufp, char *end, const char *fmt, ...) @@ -476,6 +565,15 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode, if (!strcmp(group, "synthetic")) if (trace_boot_add_synth_event(enode, event) < 0) return; + if (!strcmp(group, "eprobes")) + if (trace_boot_add_eprobe_event(enode, group, event) < 0) + return; + if (!strcmp(group, "fprobes")) + if (trace_boot_add_fprobe_event(enode, group, event) < 0) + return; + if (!strcmp(group, "tracepoints") || !strcmp(group, "tprobes")) + if (trace_boot_add_tprobe_event(enode, group, event) < 0) + return; mutex_lock(&event_mutex); file = find_event_file(tr, group, event); @@ -597,7 +695,7 @@ trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node) p = xbc_node_find_value(node, "tracer", NULL); if (p && *p != '\0') { - if (tracing_set_tracer(tr, p) < 0) + if (trace_array_is_readonly(tr) || tracing_set_tracer(tr, p) < 0) pr_err("Failed to set given tracer: %s\n", p); } |