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authorBeau Belgrave <beaub@linux.microsoft.com>2022-03-29 19:30:51 +0200
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-04-02 14:40:09 +0200
commit768c1e7f1de03afd0b55e0e951efc272309eeb52 (patch)
treeb5ef69ee491c3225b2f23e4e8f16f144f0fa0da1 /kernel/trace/trace_events_user.c
parenttracing/user_events: Hold event_mutex during dyn_event_add (diff)
downloadlinux-768c1e7f1de03afd0b55e0e951efc272309eeb52.tar.xz
linux-768c1e7f1de03afd0b55e0e951efc272309eeb52.zip
tracing/user_events: Remove eBPF interfaces
Remove eBPF interfaces within user_events to ensure they are fully reviewed. Link: https://lore.kernel.org/all/20220329165718.GA10381@kbox/ Link: https://lkml.kernel.org/r/20220329173051.10087-1-beaub@linux.microsoft.com Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_events_user.c')
-rw-r--r--kernel/trace/trace_events_user.c73
1 files changed, 1 insertions, 72 deletions
diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 61d78d64bdf0..846c27bc7aef 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -42,9 +42,6 @@
#define MAX_FIELD_ARRAY_SIZE 1024
#define MAX_FIELD_ARG_NAME 256
-#define MAX_BPF_COPY_SIZE PAGE_SIZE
-#define MAX_STACK_BPF_DATA 512
-
static char *register_page_data;
static DEFINE_MUTEX(reg_mutex);
@@ -405,19 +402,6 @@ parse:
type[0] != 'u', FILTER_OTHER);
}
-static void user_event_parse_flags(struct user_event *user, char *flags)
-{
- char *flag;
-
- if (flags == NULL)
- return;
-
- while ((flag = strsep(&flags, ",")) != NULL) {
- if (strcmp(flag, "BPF_ITER") == 0)
- user->flags |= FLAG_BPF_ITER;
- }
-}
-
static int user_event_parse_fields(struct user_event *user, char *args)
{
char *field;
@@ -713,64 +697,14 @@ discard:
}
#ifdef CONFIG_PERF_EVENTS
-static void user_event_bpf(struct user_event *user, struct iov_iter *i)
-{
- struct user_bpf_context context;
- struct user_bpf_iter bpf_i;
- char fast_data[MAX_STACK_BPF_DATA];
- void *temp = NULL;
-
- if ((user->flags & FLAG_BPF_ITER) && iter_is_iovec(i)) {
- /* Raw iterator */
- context.data_type = USER_BPF_DATA_ITER;
- context.data_len = i->count;
- context.iter = &bpf_i;
-
- bpf_i.iov_offset = i->iov_offset;
- bpf_i.iov = i->iov;
- bpf_i.nr_segs = i->nr_segs;
- } else if (i->nr_segs == 1 && iter_is_iovec(i)) {
- /* Single buffer from user */
- context.data_type = USER_BPF_DATA_USER;
- context.data_len = i->count;
- context.udata = i->iov->iov_base + i->iov_offset;
- } else {
- /* Multi buffer from user */
- struct iov_iter copy = *i;
- size_t copy_size = min_t(size_t, i->count, MAX_BPF_COPY_SIZE);
-
- context.data_type = USER_BPF_DATA_KERNEL;
- context.kdata = fast_data;
-
- if (unlikely(copy_size > sizeof(fast_data))) {
- temp = kmalloc(copy_size, GFP_NOWAIT);
-
- if (temp)
- context.kdata = temp;
- else
- copy_size = sizeof(fast_data);
- }
-
- context.data_len = copy_nofault(context.kdata,
- copy_size, &copy);
- }
-
- trace_call_bpf(&user->call, &context);
-
- kfree(temp);
-}
-
/*
- * Writes the user supplied payload out to perf ring buffer or eBPF program.
+ * Writes the user supplied payload out to perf ring buffer.
*/
static void user_event_perf(struct user_event *user, struct iov_iter *i,
void *tpdata, bool *faulted)
{
struct hlist_head *perf_head;
- if (bpf_prog_array_valid(&user->call))
- user_event_bpf(user, i);
-
perf_head = this_cpu_ptr(user->call.perf_events);
if (perf_head && !hlist_empty(perf_head)) {
@@ -1136,8 +1070,6 @@ static int user_event_parse(char *name, char *args, char *flags,
user->tracepoint.name = name;
- user_event_parse_flags(user, flags);
-
ret = user_event_parse_fields(user, args);
if (ret)
@@ -1579,9 +1511,6 @@ static int user_seq_show(struct seq_file *m, void *p)
busy++;
}
- if (flags & FLAG_BPF_ITER)
- seq_puts(m, " FLAG:BPF_ITER");
-
seq_puts(m, "\n");
active++;
}