[PATCH perf/core 04/11] bpf: Add support to attach uprobe_multi unique uprobe

[Jiri Olsa]

Adding support to attach unique uprobe through uprobe multi link
interface.

Adding new BPF_F_UPROBE_MULTI_UNIQUE flag that denotes the unique
uprobe creation.

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 include/uapi/linux/bpf.h       | 3 ++-
 kernel/trace/bpf_trace.c       | 4 +++-
 tools/include/uapi/linux/bpf.h | 3 ++-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 233de8677382..3de9eb469fe2 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1300,7 +1300,8 @@ enum {
  * BPF_TRACE_UPROBE_MULTI attach type to create return probe.
  */
 enum {
-       BPF_F_UPROBE_MULTI_RETURN = (1U << 0)
+       BPF_F_UPROBE_MULTI_RETURN = (1U << 0),
+       BPF_F_UPROBE_MULTI_UNIQUE = (1U << 1),
 };
 
 /* link_create.netfilter.flags used in LINK_CREATE command for
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 3ae52978cae6..0674d5ac7b55 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3349,7 +3349,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr 
*attr, struct bpf_prog *pr
                return -EINVAL;
 
        flags = attr->link_create.uprobe_multi.flags;
-       if (flags & ~BPF_F_UPROBE_MULTI_RETURN)
+       if (flags & ~(BPF_F_UPROBE_MULTI_RETURN|BPF_F_UPROBE_MULTI_UNIQUE))
                return -EINVAL;
 
        /*
@@ -3423,6 +3423,8 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr 
*attr, struct bpf_prog *pr
 
                uprobes[i].link = link;
 
+               if (flags & BPF_F_UPROBE_MULTI_UNIQUE)
+                       uprobes[i].consumer.is_unique = true;
                if (!(flags & BPF_F_UPROBE_MULTI_RETURN))
                        uprobes[i].consumer.handler = uprobe_multi_link_handler;
                if (flags & BPF_F_UPROBE_MULTI_RETURN || 
is_uprobe_session(prog))
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 233de8677382..3de9eb469fe2 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1300,7 +1300,8 @@ enum {
  * BPF_TRACE_UPROBE_MULTI attach type to create return probe.
  */
 enum {
-       BPF_F_UPROBE_MULTI_RETURN = (1U << 0)
+       BPF_F_UPROBE_MULTI_RETURN = (1U << 0),
+       BPF_F_UPROBE_MULTI_UNIQUE = (1U << 1),
 };
 
 /* link_create.netfilter.flags used in LINK_CREATE command for
-- 
2.51.0