On Mon, 7 Dec 2020 18:33:22 -0500 Steven Rostedt <rost...@goodmis.org> wrote:
> > Hi Masami, > > You had comments on this patch for v2. Is this one fine for you? Yes, this part is good for me. v2 [1/4] is separated into v3 [1/5] and [2/5]. Acked-by: Masami Hiramatsu <mhira...@kernel.org> Thank you, > > -- Steve > > > On Mon, 26 Oct 2020 10:06:09 -0500 > Tom Zanussi <zanu...@kernel.org> wrote: > > > From: Masami Hiramatsu <mhira...@kernel.org> > > > > Delegate command parsing to each create function so that the > > command syntax can be customized. > > > > This requires changes to the kprobe/uprobe/synthetic event handling, > > which are also included here. > > > > Signed-off-by: Masami Hiramatsu <mhira...@kernel.org> > > [ zanu...@kernel.org: added synthetic event modifications ] > > Signed-off-by: Tom Zanussi <zanu...@kernel.org> > > --- > > kernel/trace/trace.c | 23 ++---------- > > kernel/trace/trace.h | 3 +- > > kernel/trace/trace_dynevent.c | 35 +++++++++++------- > > kernel/trace/trace_dynevent.h | 4 +-- > > kernel/trace/trace_events_synth.c | 60 +++++++++++++++++++++++-------- > > kernel/trace/trace_kprobe.c | 33 +++++++++-------- > > kernel/trace/trace_probe.c | 17 +++++++++ > > kernel/trace/trace_probe.h | 1 + > > kernel/trace/trace_uprobe.c | 17 +++++---- > > 9 files changed, 120 insertions(+), 73 deletions(-) > > > > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c > > index 63c97012ed39..277d97220971 100644 > > --- a/kernel/trace/trace.c > > +++ b/kernel/trace/trace.c > > @@ -9367,30 +9367,11 @@ void ftrace_dump(enum ftrace_dump_mode > > oops_dump_mode) > > } > > EXPORT_SYMBOL_GPL(ftrace_dump); > > > > -int trace_run_command(const char *buf, int (*createfn)(int, char **)) > > -{ > > - char **argv; > > - int argc, ret; > > - > > - argc = 0; > > - ret = 0; > > - argv = argv_split(GFP_KERNEL, buf, &argc); > > - if (!argv) > > - return -ENOMEM; > > - > > - if (argc) > > - ret = createfn(argc, argv); > > - > > - argv_free(argv); > > - > > - return ret; > > -} > > - > > #define WRITE_BUFSIZE 4096 > > > > ssize_t trace_parse_run_command(struct file *file, const char __user > > *buffer, > > size_t count, loff_t *ppos, > > - int (*createfn)(int, char **)) > > + int (*createfn)(const char *)) > > { > > char *kbuf, *buf, *tmp; > > int ret = 0; > > @@ -9438,7 +9419,7 @@ ssize_t trace_parse_run_command(struct file *file, > > const char __user *buffer, > > if (tmp) > > *tmp = '\0'; > > > > - ret = trace_run_command(buf, createfn); > > + ret = createfn(buf); > > if (ret) > > goto out; > > buf += size; > > diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h > > index 34e0c4d5a6e7..02d7c487a30b 100644 > > --- a/kernel/trace/trace.h > > +++ b/kernel/trace/trace.h > > @@ -1982,10 +1982,9 @@ extern int tracing_set_cpumask(struct trace_array > > *tr, > > > > #define MAX_EVENT_NAME_LEN 64 > > > > -extern int trace_run_command(const char *buf, int (*createfn)(int, > > char**)); > > extern ssize_t trace_parse_run_command(struct file *file, > > const char __user *buffer, size_t count, loff_t *ppos, > > - int (*createfn)(int, char**)); > > + int (*createfn)(const char *)); > > > > extern unsigned int err_pos(char *cmd, const char *str); > > extern void tracing_log_err(struct trace_array *tr, > > diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c > > index 5fa49cfd2bb6..af83bc5447fe 100644 > > --- a/kernel/trace/trace_dynevent.c > > +++ b/kernel/trace/trace_dynevent.c > > @@ -31,23 +31,31 @@ int dyn_event_register(struct dyn_event_operations *ops) > > return 0; > > } > > > > -int dyn_event_release(int argc, char **argv, struct dyn_event_operations > > *type) > > +int dyn_event_release(const char *raw_command, struct dyn_event_operations > > *type) > > { > > struct dyn_event *pos, *n; > > char *system = NULL, *event, *p; > > - int ret = -ENOENT; > > + int argc, ret = -ENOENT; > > + char **argv; > > + > > + argv = argv_split(GFP_KERNEL, raw_command, &argc); > > + if (!argv) > > + return -ENOMEM; > > > > if (argv[0][0] == '-') { > > - if (argv[0][1] != ':') > > - return -EINVAL; > > + if (argv[0][1] != ':') { > > + ret = -EINVAL; > > + goto out; > > + } > > event = &argv[0][2]; > > } else { > > event = strchr(argv[0], ':'); > > - if (!event) > > - return -EINVAL; > > + if (!event) { > > + ret = -EINVAL; > > + goto out; > > + } > > event++; > > } > > - argc--; argv++; > > > > p = strchr(event, '/'); > > if (p) { > > @@ -63,7 +71,7 @@ int dyn_event_release(int argc, char **argv, struct > > dyn_event_operations *type) > > if (type && type != pos->ops) > > continue; > > if (!pos->ops->match(system, event, > > - argc, (const char **)argv, pos)) > > + argc - 1, (const char **)argv + 1, pos)) > > continue; > > > > ret = pos->ops->free(pos); > > @@ -71,21 +79,22 @@ int dyn_event_release(int argc, char **argv, struct > > dyn_event_operations *type) > > break; > > } > > mutex_unlock(&event_mutex); > > - > > +out: > > + argv_free(argv); > > return ret; > > } > > > > -static int create_dyn_event(int argc, char **argv) > > +static int create_dyn_event(const char *raw_command) > > { > > struct dyn_event_operations *ops; > > int ret = -ENODEV; > > > > - if (argv[0][0] == '-' || argv[0][0] == '!') > > - return dyn_event_release(argc, argv, NULL); > > + if (raw_command[0] == '-' || raw_command[0] == '!') > > + return dyn_event_release(raw_command, NULL); > > > > mutex_lock(&dyn_event_ops_mutex); > > list_for_each_entry(ops, &dyn_event_ops_list, list) { > > - ret = ops->create(argc, (const char **)argv); > > + ret = ops->create(raw_command); > > if (!ret || ret != -ECANCELED) > > break; > > } > > diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h > > index d6857a254ede..4f4e03df4cbb 100644 > > --- a/kernel/trace/trace_dynevent.h > > +++ b/kernel/trace/trace_dynevent.h > > @@ -39,7 +39,7 @@ struct dyn_event; > > */ > > struct dyn_event_operations { > > struct list_head list; > > - int (*create)(int argc, const char *argv[]); > > + int (*create)(const char *raw_command); > > int (*show)(struct seq_file *m, struct dyn_event *ev); > > bool (*is_busy)(struct dyn_event *ev); > > int (*free)(struct dyn_event *ev); > > @@ -97,7 +97,7 @@ void *dyn_event_seq_start(struct seq_file *m, loff_t > > *pos); > > void *dyn_event_seq_next(struct seq_file *m, void *v, loff_t *pos); > > void dyn_event_seq_stop(struct seq_file *m, void *v); > > int dyn_events_release_all(struct dyn_event_operations *type); > > -int dyn_event_release(int argc, char **argv, struct dyn_event_operations > > *type); > > +int dyn_event_release(const char *raw_command, struct dyn_event_operations > > *type); > > > > /* > > * for_each_dyn_event - iterate over the dyn_event list > > diff --git a/kernel/trace/trace_events_synth.c > > b/kernel/trace/trace_events_synth.c > > index bdd427ccdfc5..271811fbf8fb 100644 > > --- a/kernel/trace/trace_events_synth.c > > +++ b/kernel/trace/trace_events_synth.c > > @@ -62,7 +62,7 @@ static void synth_err(u8 err_type, u8 err_pos) > > err_type, err_pos); > > } > > > > -static int create_synth_event(int argc, const char **argv); > > +static int create_synth_event(const char *raw_command); > > static int synth_event_show(struct seq_file *m, struct dyn_event *ev); > > static int synth_event_release(struct dyn_event *ev); > > static bool synth_event_is_busy(struct dyn_event *ev); > > @@ -1385,18 +1385,30 @@ int synth_event_delete(const char *event_name) > > } > > EXPORT_SYMBOL_GPL(synth_event_delete); > > > > -static int create_or_delete_synth_event(int argc, char **argv) > > +static int create_or_delete_synth_event(const char *raw_command) > > { > > - const char *name = argv[0]; > > - int ret; > > + char **argv, *name = NULL; > > + int argc = 0, ret = 0; > > + > > + argv = argv_split(GFP_KERNEL, raw_command, &argc); > > + if (!argv) > > + return -ENOMEM; > > + > > + if (!argc) > > + goto free; > > + > > + name = argv[0]; > > > > /* trace_run_command() ensures argc != 0 */ > > if (name[0] == '!') { > > ret = synth_event_delete(name + 1); > > - return ret; > > + goto free; > > } > > > > ret = __create_synth_event(argc - 1, name, (const char **)argv + 1); > > +free: > > + argv_free(argv); > > + > > return ret == -ECANCELED ? -EINVAL : ret; > > } > > > > @@ -1405,7 +1417,7 @@ static int synth_event_run_command(struct > > dynevent_cmd *cmd) > > struct synth_event *se; > > int ret; > > > > - ret = trace_run_command(cmd->seq.buffer, create_or_delete_synth_event); > > + ret = create_or_delete_synth_event(cmd->seq.buffer); > > if (ret) > > return ret; > > > > @@ -1941,23 +1953,43 @@ int synth_event_trace_end(struct > > synth_event_trace_state *trace_state) > > } > > EXPORT_SYMBOL_GPL(synth_event_trace_end); > > > > -static int create_synth_event(int argc, const char **argv) > > +static int create_synth_event(const char *raw_command) > > { > > - const char *name = argv[0]; > > - int len; > > + char **argv, *name; > > + int len, argc = 0, ret = 0; > > + > > + argv = argv_split(GFP_KERNEL, raw_command, &argc); > > + if (!argv) { > > + ret = -ENOMEM; > > + return ret; > > + } > > > > - if (name[0] != 's' || name[1] != ':') > > - return -ECANCELED; > > + if (!argc) > > + goto free; > > + > > + name = argv[0]; > > + > > + if (name[0] != 's' || name[1] != ':') { > > + ret = -ECANCELED; > > + goto free; > > + } > > name += 2; > > > > /* This interface accepts group name prefix */ > > if (strchr(name, '/')) { > > len = str_has_prefix(name, SYNTH_SYSTEM "/"); > > - if (len == 0) > > - return -EINVAL; > > + if (len == 0) { > > + ret = -EINVAL; > > + goto free; > > + } > > name += len; > > } > > - return __create_synth_event(argc - 1, name, argv + 1); > > + > > + ret = __create_synth_event(argc - 1, name, (const char **)argv + 1); > > +free: > > + argv_free(argv); > > + > > + return ret; > > } > > > > static int synth_event_release(struct dyn_event *ev) > > diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c > > index b911e9f6d9f5..ddef93e32905 100644 > > --- a/kernel/trace/trace_kprobe.c > > +++ b/kernel/trace/trace_kprobe.c > > @@ -34,7 +34,7 @@ static int __init set_kprobe_boot_events(char *str) > > } > > __setup("kprobe_event=", set_kprobe_boot_events); > > > > -static int trace_kprobe_create(int argc, const char **argv); > > +static int trace_kprobe_create(const char *raw_command); > > static int trace_kprobe_show(struct seq_file *m, struct dyn_event *ev); > > static int trace_kprobe_release(struct dyn_event *ev); > > static bool trace_kprobe_is_busy(struct dyn_event *ev); > > @@ -710,7 +710,7 @@ static inline void sanitize_event_name(char *name) > > *name = '_'; > > } > > > > -static int trace_kprobe_create(int argc, const char *argv[]) > > +static int __trace_kprobe_create(int argc, const char *argv[]) > > { > > /* > > * Argument syntax: > > @@ -907,20 +907,25 @@ static int trace_kprobe_create(int argc, const char > > *argv[]) > > goto out; > > } > > > > -static int create_or_delete_trace_kprobe(int argc, char **argv) > > +static int trace_kprobe_create(const char *raw_command) > > +{ > > + return trace_probe_create(raw_command, __trace_kprobe_create); > > +} > > + > > +static int create_or_delete_trace_kprobe(const char *raw_command) > > { > > int ret; > > > > - if (argv[0][0] == '-') > > - return dyn_event_release(argc, argv, &trace_kprobe_ops); > > + if (raw_command[0] == '-') > > + return dyn_event_release(raw_command, &trace_kprobe_ops); > > > > - ret = trace_kprobe_create(argc, (const char **)argv); > > + ret = trace_kprobe_create(raw_command); > > return ret == -ECANCELED ? -EINVAL : ret; > > } > > > > static int trace_kprobe_run_command(struct dynevent_cmd *cmd) > > { > > - return trace_run_command(cmd->seq.buffer, > > create_or_delete_trace_kprobe); > > + return create_or_delete_trace_kprobe(cmd->seq.buffer); > > } > > > > /** > > @@ -1081,7 +1086,7 @@ int kprobe_event_delete(const char *name) > > > > snprintf(buf, MAX_EVENT_NAME_LEN, "-:%s", name); > > > > - return trace_run_command(buf, create_or_delete_trace_kprobe); > > + return create_or_delete_trace_kprobe(buf); > > } > > EXPORT_SYMBOL_GPL(kprobe_event_delete); > > > > @@ -1884,7 +1889,7 @@ static __init void setup_boot_kprobe_events(void) > > if (p) > > *p++ = '\0'; > > > > - ret = trace_run_command(cmd, create_or_delete_trace_kprobe); > > + ret = create_or_delete_trace_kprobe(cmd); > > if (ret) > > pr_warn("Failed to add event(%d): %s\n", ret, cmd); > > else > > @@ -1982,8 +1987,7 @@ static __init int kprobe_trace_self_tests_init(void) > > > > pr_info("Testing kprobe tracing: "); > > > > - ret = trace_run_command("p:testprobe kprobe_trace_selftest_target > > $stack $stack0 +0($stack)", > > - create_or_delete_trace_kprobe); > > + ret = create_or_delete_trace_kprobe("p:testprobe > > kprobe_trace_selftest_target $stack $stack0 +0($stack)"); > > if (WARN_ON_ONCE(ret)) { > > pr_warn("error on probing function entry.\n"); > > warn++; > > @@ -2004,8 +2008,7 @@ static __init int kprobe_trace_self_tests_init(void) > > } > > } > > > > - ret = trace_run_command("r:testprobe2 kprobe_trace_selftest_target > > $retval", > > - create_or_delete_trace_kprobe); > > + ret = create_or_delete_trace_kprobe("r:testprobe2 > > kprobe_trace_selftest_target $retval"); > > if (WARN_ON_ONCE(ret)) { > > pr_warn("error on probing function return.\n"); > > warn++; > > @@ -2078,13 +2081,13 @@ static __init int kprobe_trace_self_tests_init(void) > > trace_probe_event_call(&tk->tp), file); > > } > > > > - ret = trace_run_command("-:testprobe", create_or_delete_trace_kprobe); > > + ret = create_or_delete_trace_kprobe("-:testprobe"); > > if (WARN_ON_ONCE(ret)) { > > pr_warn("error on deleting a probe.\n"); > > warn++; > > } > > > > - ret = trace_run_command("-:testprobe2", create_or_delete_trace_kprobe); > > + ret = create_or_delete_trace_kprobe("-:testprobe2"); > > if (WARN_ON_ONCE(ret)) { > > pr_warn("error on deleting a probe.\n"); > > warn++; > > diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c > > index d2867ccc6aca..ec589a4612df 100644 > > --- a/kernel/trace/trace_probe.c > > +++ b/kernel/trace/trace_probe.c > > @@ -1134,3 +1134,20 @@ bool trace_probe_match_command_args(struct > > trace_probe *tp, > > } > > return true; > > } > > + > > +int trace_probe_create(const char *raw_command, int (*createfn)(int, const > > char **)) > > +{ > > + int argc = 0, ret = 0; > > + char **argv; > > + > > + argv = argv_split(GFP_KERNEL, raw_command, &argc); > > + if (!argv) > > + return -ENOMEM; > > + > > + if (argc) > > + ret = createfn(argc, (const char **)argv); > > + > > + argv_free(argv); > > + > > + return ret; > > +} > > diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h > > index 2f703a20c724..7ce4027089ee 100644 > > --- a/kernel/trace/trace_probe.h > > +++ b/kernel/trace/trace_probe.h > > @@ -341,6 +341,7 @@ struct event_file_link > > *trace_probe_get_file_link(struct trace_probe *tp, > > int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe > > *b); > > bool trace_probe_match_command_args(struct trace_probe *tp, > > int argc, const char **argv); > > +int trace_probe_create(const char *raw_command, int (*createfn)(int, const > > char **)); > > > > #define trace_probe_for_each_link(pos, tp) \ > > list_for_each_entry(pos, &(tp)->event->files, list) > > diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c > > index 3cf7128e1ad3..e6b56a65f80f 100644 > > --- a/kernel/trace/trace_uprobe.c > > +++ b/kernel/trace/trace_uprobe.c > > @@ -34,7 +34,7 @@ struct uprobe_trace_entry_head { > > #define DATAOF_TRACE_ENTRY(entry, is_return) \ > > ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return)) > > > > -static int trace_uprobe_create(int argc, const char **argv); > > +static int trace_uprobe_create(const char *raw_command); > > static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev); > > static int trace_uprobe_release(struct dyn_event *ev); > > static bool trace_uprobe_is_busy(struct dyn_event *ev); > > @@ -530,7 +530,7 @@ static int register_trace_uprobe(struct trace_uprobe > > *tu) > > * Argument syntax: > > * - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET[%return][(REF)] [FETCHARGS] > > */ > > -static int trace_uprobe_create(int argc, const char **argv) > > +static int __trace_uprobe_create(int argc, const char **argv) > > { > > struct trace_uprobe *tu; > > const char *event = NULL, *group = UPROBE_EVENT_SYSTEM; > > @@ -716,14 +716,19 @@ static int trace_uprobe_create(int argc, const char > > **argv) > > return ret; > > } > > > > -static int create_or_delete_trace_uprobe(int argc, char **argv) > > +int trace_uprobe_create(const char *raw_command) > > +{ > > + return trace_probe_create(raw_command, __trace_uprobe_create); > > +} > > + > > +static int create_or_delete_trace_uprobe(const char *raw_command) > > { > > int ret; > > > > - if (argv[0][0] == '-') > > - return dyn_event_release(argc, argv, &trace_uprobe_ops); > > + if (raw_command[0] == '-') > > + return dyn_event_release(raw_command, &trace_uprobe_ops); > > > > - ret = trace_uprobe_create(argc, (const char **)argv); > > + ret = trace_uprobe_create(raw_command); > > return ret == -ECANCELED ? -EINVAL : ret; > > } > > > -- Masami Hiramatsu <mhira...@kernel.org>