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Date:   Thu, 12 May 2022 13:15:41 +0530
From:   Hari Bathini <>
To:, linuxppc-dev <>
Cc:     Michael Ellerman <>,
        "Naveen N. Rao" <>,
        Christophe Leroy <>,,
        Benjamin Herrenschmidt <>,
        Paul Mackerras <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        John Fastabend <>,
        KP Singh <>,
        Jordan Niethe <>
Subject: [PATCH 0/5] Atomics support for eBPF on powerpc

This patchset adds atomic operations to the eBPF instruction set on
powerpc. The instructions that are added here can be summarised with
this list of kernel operations for ppc64:

* atomic[64]_[fetch_]add
* atomic[64]_[fetch_]and
* atomic[64]_[fetch_]or
* atomic[64]_[fetch_]xor
* atomic[64]_xchg
* atomic[64]_cmpxchg

and this list of kernel operations for ppc32:

* atomic_[fetch_]add
* atomic_[fetch_]and
* atomic_[fetch_]or
* atomic_[fetch_]xor
* atomic_xchg
* atomic_cmpxchg

The following are left out of scope for this effort:

* 64 bit operations on ppc32.
* Explicit memory barriers, 16 and 8 bit operations on both ppc32
  & ppc64.

The first patch adds support for bitwsie atomic operations on ppc64.
The next patch adds fetch variant support for these instructions. The
third patch adds support for xchg and cmpxchg atomic operations on
ppc64. Patch #4 adds support for 32-bit atomic bitwise operations on
ppc32. patch #5 adds support for xchg and cmpxchg atomic operations
on ppc32.

Hari Bathini (5):
  bpf ppc64: add support for BPF_ATOMIC bitwise operations
  bpf ppc64: add support for atomic fetch operations
  bpf ppc64: Add instructions for atomic_[cmp]xchg
  bpf ppc32: add support for BPF_ATOMIC bitwise operations
  bpf ppc32: Add instructions for atomic_[cmp]xchg

 arch/powerpc/net/bpf_jit_comp32.c | 62 +++++++++++++++++-----
 arch/powerpc/net/bpf_jit_comp64.c | 87 +++++++++++++++++++++----------
 2 files changed, 108 insertions(+), 41 deletions(-)


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