linux-kernel - [PATCH bpf-next v2 0/4] Add ftrace direct call for arm64

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Date:   Tue, 13 Sep 2022 12:27:28 -0400
From:   Xu Kuohai <xukuohai@...weicloud.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Florent Revest <revest@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Guo Ren <guoren@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH bpf-next v2 0/4] Add ftrace direct call for arm64

This series adds ftrace direct call for arm64, which is required to attach
bpf trampoline to fentry.

Although there is no agreement on how to support ftrace direct call on arm64,
no patch has been posted except the one I posted in [1], so this series
continues the work of [1] with the addition of long jump support. Now ftrace
direct call works regardless of the distance between the callsite and custom
trampoline.

[1] https://lore.kernel.org/bpf/20220518131638.3401509-2-xukuohai@huawei.com/

v2:
- Fix compile and runtime errors caused by ftrace_rec_arch_init

v1: https://lore.kernel.org/bpf/20220913063146.74750-1-xukuohai@huaweicloud.com/

Xu Kuohai (4):
  ftrace: Allow users to disable ftrace direct call
  arm64: ftrace: Support long jump for ftrace direct call
  arm64: ftrace: Add ftrace direct call support
  ftrace: Fix dead loop caused by direct call in ftrace selftest

 arch/arm64/Kconfig                |   2 +
 arch/arm64/Makefile               |   4 +
 arch/arm64/include/asm/ftrace.h   |  35 ++++--
 arch/arm64/include/asm/patching.h |   2 +
 arch/arm64/include/asm/ptrace.h   |   6 +-
 arch/arm64/kernel/asm-offsets.c   |   1 +
 arch/arm64/kernel/entry-ftrace.S  |  39 ++++--
 arch/arm64/kernel/ftrace.c        | 198 ++++++++++++++++++++++++++++--
 arch/arm64/kernel/patching.c      |  14 +++
 arch/arm64/net/bpf_jit_comp.c     |   4 +
 include/linux/ftrace.h            |   2 +
 kernel/trace/Kconfig              |   7 +-
 kernel/trace/ftrace.c             |   9 +-
 kernel/trace/trace_selftest.c     |   2 +
 14 files changed, 296 insertions(+), 29 deletions(-)

-- 
2.30.2