From: Benjamin Gray <bgray@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: ajd@linux.ibm.com, peterz@infradead.org,
Benjamin Gray <bgray@linux.ibm.com>,
npiggin@gmail.com, ardb@kernel.org, jbaron@akamai.com,
rostedt@goodmis.org, jpoimboe@kernel.org
Subject: [PATCH v4 0/6] Out-of-line static calls for powerpc64 ELF V2
Date: Mon, 10 Oct 2022 11:29:51 +1100 [thread overview]
Message-ID: <20221010002957.128276-1-bgray@linux.ibm.com> (raw)
Implementation of out-of-line static calls for PowerPC 64-bit ELF V2 ABI.
Static calls patch an indirect branch into a direct branch at runtime.
Out-of-line specifically has a caller directly call a trampoline, and
the trampoline gets patched to directly call the target.
Previous versions here:
V3: https://lore.kernel.org/all/20221005053234.29312-1-bgray@linux.ibm.com/
V2: https://lore.kernel.org/all/20220926064316.765967-1-bgray@linux.ibm.com/
V1: https://lore.kernel.org/all/20220916062330.430468-1-bgray@linux.ibm.com/
RFC: https://lore.kernel.org/linuxppc-dev/20220901055823.152983-1-bgray@linux.ibm.com/
Still rebased on top of
https://lore.kernel.org/all/0df84a2eea551c1d000c34c36d0c1d23cbe26a97.1664289176.git.christophe.leroy@csgroup.eu/
Changed for V4:
[1/6]
* IS_ENABLED(CONFIG_PPC64) added to patch size condition for better
compiler optimisation
[2/6]
* Reworded message
* Refactored need r2 save expression. Parens are intentional, C operator
precedence can be difficult to remember, especially when three different
kinds are used in a single expression.
Benjamin Gray (6):
powerpc/code-patching: Implement generic text patching function
powerpc/module: Handle caller-saved TOC in module linker
powerpc/module: Optimise nearby branches in ELF V2 ABI stub
static_call: Move static call selftest to static_call_selftest.c
powerpc/64: Add support for out-of-line static calls
powerpc: Add tests for out-of-line static calls
arch/powerpc/Kconfig | 26 ++-
arch/powerpc/include/asm/code-patching.h | 30 +++
arch/powerpc/include/asm/static_call.h | 80 ++++++-
arch/powerpc/kernel/Makefile | 4 +-
arch/powerpc/kernel/module_64.c | 26 ++-
arch/powerpc/kernel/static_call.c | 183 +++++++++++++++-
arch/powerpc/kernel/static_call_test.c | 263 +++++++++++++++++++++++
arch/powerpc/kernel/static_call_test.h | 56 +++++
arch/powerpc/lib/code-patching.c | 73 +++++--
kernel/Makefile | 1 +
kernel/static_call_inline.c | 43 ----
kernel/static_call_selftest.c | 41 ++++
12 files changed, 753 insertions(+), 73 deletions(-)
create mode 100644 arch/powerpc/kernel/static_call_test.c
create mode 100644 arch/powerpc/kernel/static_call_test.h
create mode 100644 kernel/static_call_selftest.c
base-commit: 86de6882270620777fe9cc16ece97e9ee407122c
--
2.37.3
next reply other threads:[~2022-10-10 0:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-10 0:29 Benjamin Gray [this message]
2022-10-10 0:29 ` [PATCH v4 1/6] powerpc/code-patching: Implement generic text patching function Benjamin Gray
2022-10-10 4:45 ` Andrew Donnellan
2022-10-10 7:00 ` Andrew Donnellan
2022-10-10 0:29 ` [PATCH v4 2/6] powerpc/module: Handle caller-saved TOC in module linker Benjamin Gray
2022-10-25 2:10 ` Andrew Donnellan
2022-10-25 23:41 ` Benjamin Gray
2022-10-10 0:29 ` [PATCH v4 3/6] powerpc/module: Optimise nearby branches in ELF V2 ABI stub Benjamin Gray
2022-10-10 0:29 ` [PATCH v4 4/6] static_call: Move static call selftest to static_call_selftest.c Benjamin Gray
2022-10-10 0:29 ` [PATCH v4 5/6] powerpc/64: Add support for out-of-line static calls Benjamin Gray
2022-10-10 0:29 ` [PATCH v4 6/6] powerpc: Add tests " Benjamin Gray
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