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* [PATCH bpf-next 0/4] Add ftrace direct call for arm64
@ 2022-09-13  6:31 Xu Kuohai
  2022-09-13  6:31 ` [PATCH bpf-next 1/4] ftrace: Allow users to disable ftrace direct call Xu Kuohai
                   ` (3 more replies)
  0 siblings, 4 replies; 6+ messages in thread
From: Xu Kuohai @ 2022-09-13  6:31 UTC (permalink / raw)
  To: linux-arm-kernel, linux-kernel, bpf
  Cc: Mark Rutland, Florent Revest, Catalin Marinas, Will Deacon,
	Jean-Philippe Brucker, Steven Rostedt, Ingo Molnar,
	Oleg Nesterov, Alexei Starovoitov, Daniel Borkmann,
	Andrii Nakryiko, Martin KaFai Lau, Song Liu, Yonghong Song,
	John Fastabend, KP Singh, Stanislav Fomichev, Hao Luo, Jiri Olsa,
	Zi Shen Lim, Pasha Tatashin, Ard Biesheuvel, Marc Zyngier,
	Guo Ren, Masami Hiramatsu

From: Xu Kuohai <xukuohai@huawei.com>

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/

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 +
 kernel/trace/Kconfig              |   7 +-
 kernel/trace/ftrace.c             |  10 +-
 kernel/trace/trace_selftest.c     |   2 +
 13 files changed, 295 insertions(+), 29 deletions(-)

-- 
2.30.2


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2022-09-13  7:54 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-09-13  6:31 [PATCH bpf-next 0/4] Add ftrace direct call for arm64 Xu Kuohai
2022-09-13  6:31 ` [PATCH bpf-next 1/4] ftrace: Allow users to disable ftrace direct call Xu Kuohai
2022-09-13  6:31 ` [PATCH bpf-next 2/4] arm64: ftrace: Support long jump for " Xu Kuohai
2022-09-13  7:53   ` kernel test robot
2022-09-13  6:31 ` [PATCH bpf-next 3/4] arm64: ftrace: Add ftrace direct call support Xu Kuohai
2022-09-13  6:31 ` [PATCH bpf-next 4/4] ftrace: Fix dead loop caused by direct call in ftrace selftest Xu Kuohai

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