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Message-Id: <164338032828.2429999.6656207291595094804.stgit@devnote2>
Date: Fri, 28 Jan 2022 23:32:08 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Jiri Olsa <jolsa@...hat.com>, Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>, netdev@...r.kernel.org,
bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>,
"Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
"David S . Miller" <davem@...emloft.net>
Subject: [PATCH v6 01/10] ftrace: Add ftrace_set_filter_ips function
From: Jiri Olsa <jolsa@...hat.com>
Adding ftrace_set_filter_ips function to be able to set filter on
multiple ip addresses at once.
With the kprobe multi attach interface we have cases where we need to
initialize ftrace_ops object with thousands of functions, so having
single function diving into ftrace_hash_move_and_update_ops with
ftrace_lock is faster.
The functions ips are passed as unsigned long array with count.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
Changes in v6: [Masami]
- Fix a typo and add a comment.
---
include/linux/ftrace.h | 3 ++
kernel/trace/ftrace.c | 58 +++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 52 insertions(+), 9 deletions(-)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 9999e29187de..60847cbce0da 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -512,6 +512,8 @@ struct dyn_ftrace {
int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
int remove, int reset);
+int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips,
+ unsigned int cnt, int remove, int reset);
int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
int len, int reset);
int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
@@ -802,6 +804,7 @@ static inline unsigned long ftrace_location(unsigned long ip)
#define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; })
#define ftrace_set_early_filter(ops, buf, enable) do { } while (0)
#define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })
+#define ftrace_set_filter_ips(ops, ips, cnt, remove, reset) ({ -ENODEV; })
#define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })
#define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })
#define ftrace_free_filter(ops) do { } while (0)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index b01e1fa62193..a28b1bdb234a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4958,7 +4958,7 @@ ftrace_notrace_write(struct file *file, const char __user *ubuf,
}
static int
-ftrace_match_addr(struct ftrace_hash *hash, unsigned long ip, int remove)
+__ftrace_match_addr(struct ftrace_hash *hash, unsigned long ip, int remove)
{
struct ftrace_func_entry *entry;
@@ -4976,9 +4976,30 @@ ftrace_match_addr(struct ftrace_hash *hash, unsigned long ip, int remove)
return add_hash_entry(hash, ip);
}
+static int
+ftrace_match_addr(struct ftrace_hash *hash, unsigned long *ips,
+ unsigned int cnt, int remove)
+{
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < cnt; i++) {
+ err = __ftrace_match_addr(hash, ips[i], remove);
+ if (err) {
+ /*
+ * This expects the @hash is a temporary hash and if this
+ * fails the caller must free the @hash.
+ */
+ return err;
+ }
+ }
+ return 0;
+}
+
static int
ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len,
- unsigned long ip, int remove, int reset, int enable)
+ unsigned long *ips, unsigned int cnt,
+ int remove, int reset, int enable)
{
struct ftrace_hash **orig_hash;
struct ftrace_hash *hash;
@@ -5008,8 +5029,8 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len,
ret = -EINVAL;
goto out_regex_unlock;
}
- if (ip) {
- ret = ftrace_match_addr(hash, ip, remove);
+ if (ips) {
+ ret = ftrace_match_addr(hash, ips, cnt, remove);
if (ret < 0)
goto out_regex_unlock;
}
@@ -5026,10 +5047,10 @@ ftrace_set_hash(struct ftrace_ops *ops, unsigned char *buf, int len,
}
static int
-ftrace_set_addr(struct ftrace_ops *ops, unsigned long ip, int remove,
- int reset, int enable)
+ftrace_set_addr(struct ftrace_ops *ops, unsigned long *ips, unsigned int cnt,
+ int remove, int reset, int enable)
{
- return ftrace_set_hash(ops, NULL, 0, ip, remove, reset, enable);
+ return ftrace_set_hash(ops, NULL, 0, ips, cnt, remove, reset, enable);
}
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
@@ -5628,10 +5649,29 @@ int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
int remove, int reset)
{
ftrace_ops_init(ops);
- return ftrace_set_addr(ops, ip, remove, reset, 1);
+ return ftrace_set_addr(ops, &ip, 1, remove, reset, 1);
}
EXPORT_SYMBOL_GPL(ftrace_set_filter_ip);
+/**
+ * ftrace_set_filter_ips - set functions to filter on in ftrace by addresses
+ * @ops - the ops to set the filter with
+ * @ips - the array of addresses to add to or remove from the filter.
+ * @cnt - the number of addresses in @ips
+ * @remove - non zero to remove ips from the filter
+ * @reset - non zero to reset all filters before applying this filter.
+ *
+ * Filters denote which functions should be enabled when tracing is enabled
+ * If @ips array or any ip specified within is NULL , it fails to update filter.
+ */
+int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips,
+ unsigned int cnt, int remove, int reset)
+{
+ ftrace_ops_init(ops);
+ return ftrace_set_addr(ops, ips, cnt, remove, reset, 1);
+}
+EXPORT_SYMBOL_GPL(ftrace_set_filter_ips);
+
/**
* ftrace_ops_set_global_filter - setup ops to use global filters
* @ops - the ops which will use the global filters
@@ -5653,7 +5693,7 @@ static int
ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len,
int reset, int enable)
{
- return ftrace_set_hash(ops, buf, len, 0, 0, reset, enable);
+ return ftrace_set_hash(ops, buf, len, NULL, 0, 0, reset, enable);
}
/**
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