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From: Alan Maguire <alan.maguire@oracle.com>
To: ast@kernel.org, daniel@iogearbox.net, andriin@fb.com, yhs@fb.com
Cc: linux@rasmusvillemoes.dk, andriy.shevchenko@linux.intel.com,
	pmladek@suse.com, kafai@fb.com, songliubraving@fb.com,
	john.fastabend@gmail.com, kpsingh@chromium.org, shuah@kernel.org,
	rdna@fb.com, scott.branden@broadcom.com, quentin@isovalent.com,
	cneirabustos@gmail.com, jakub@cloudflare.com, mingo@redhat.com,
	rostedt@goodmis.org, bpf@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	Alan Maguire <alan.maguire@oracle.com>
Subject: [RFC PATCH bpf-next 1/4] bpf: provide function to get vmlinux BTF information
Date: Thu,  6 Aug 2020 15:42:22 +0100	[thread overview]
Message-ID: <1596724945-22859-2-git-send-email-alan.maguire@oracle.com> (raw)
In-Reply-To: <1596724945-22859-1-git-send-email-alan.maguire@oracle.com>

It will be used later for BPF structure display support

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 include/linux/bpf.h   |  2 ++
 kernel/bpf/verifier.c | 18 ++++++++++++------
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index cef4ef0..55eb67d 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1290,6 +1290,8 @@ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr,
 	      union bpf_attr __user *uattr);
 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
 
+struct btf *bpf_get_btf_vmlinux(void);
+
 /* Map specifics */
 struct xdp_buff;
 struct sk_buff;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index b6ccfce..05dfc41 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -11064,6 +11064,17 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 	}
 }
 
+struct btf *bpf_get_btf_vmlinux(void)
+{
+	if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
+		mutex_lock(&bpf_verifier_lock);
+		if (!btf_vmlinux)
+			btf_vmlinux = btf_parse_vmlinux();
+		mutex_unlock(&bpf_verifier_lock);
+	}
+	return btf_vmlinux;
+}
+
 int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
 	      union bpf_attr __user *uattr)
 {
@@ -11097,12 +11108,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr,
 	env->ops = bpf_verifier_ops[env->prog->type];
 	is_priv = bpf_capable();
 
-	if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
-		mutex_lock(&bpf_verifier_lock);
-		if (!btf_vmlinux)
-			btf_vmlinux = btf_parse_vmlinux();
-		mutex_unlock(&bpf_verifier_lock);
-	}
+	bpf_get_btf_vmlinux();
 
 	/* grab the mutex to protect few globals used by verifier */
 	if (!is_priv)
-- 
1.8.3.1


  reply	other threads:[~2020-08-06 16:47 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-06 14:42 [RFC PATCH bpf-next 0/4] bpf: add bpf-based bpf_trace_printk()-like support Alan Maguire
2020-08-06 14:42 ` Alan Maguire [this message]
2020-08-06 14:42 ` [RFC PATCH bpf-next 2/4] bpf: make BTF show support generic, apply to seq files/bpf_trace_printk Alan Maguire
2020-08-13  1:46   ` Alexei Starovoitov
2020-08-14 13:06     ` Alan Maguire
2020-08-14 17:01       ` Alexei Starovoitov
2020-08-18  9:12         ` Alan Maguire
2020-08-20 22:16           ` Alexei Starovoitov
2020-08-06 14:42 ` [RFC PATCH bpf-next 3/4] bpf: add bpf_trace_btf helper Alan Maguire
2020-08-20  6:36   ` Andrii Nakryiko
2020-08-06 14:42 ` [RFC PATCH bpf-next 4/4] selftests/bpf: add bpf_trace_btf helper tests Alan Maguire

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