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ftrace: Add ftrace_set_filter_ips function

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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@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164735282673.1084943.18310504594134769804.stgit@devnote2
This commit is contained in:
Jiri Olsa 2022-03-15 23:00:26 +09:00 committed by Alexei Starovoitov
parent e0999c8e59
commit 4f554e9556
2 changed files with 52 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/ftrace.h
View File

@ -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)

58
kernel/trace/ftrace.c
View File

@ -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
@ -5634,10 +5655,29 @@ 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
@ -5659,7 +5699,7 @@ 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);
}
/**