linux-kernel - [PATCH v2 00/25] powerpc: ftrace optimisation and cleanup and more [v2]

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Date:   Sat,  7 May 2022 08:46:02 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        naveen.n.rao@...ux.vnet.ibm.com
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 00/25] powerpc: ftrace optimisation and cleanup and more [v2]

This series provides optimisation and cleanup of ftrace on powerpc.

With this series ftrace activation is about 20% faster on an 8xx.

At the end of the series come additional cleanups around ppc-opcode,
that would likely conflict with this series if posted separately.

Main changes since v1 (details in after each individual patch description):
- Added 3 patches (8, 9, 10) that convert PPC64_ELF_ABI_v{1/2} macros by CONFIG_PPC64_ELF_ABI_V{1/2}
- Taken comments from Naveen

Christophe Leroy (25):
  powerpc/ftrace: Refactor prepare_ftrace_return()
  powerpc/ftrace: Remove redundant create_branch() calls
  powerpc/code-patching: Inline is_offset_in_{cond}_branch_range()
  powerpc/ftrace: Use is_offset_in_branch_range()
  powerpc/code-patching: Inline create_branch()
  powerpc/ftrace: Inline ftrace_modify_code()
  powerpc/ftrace: Use patch_instruction() return directly
  powerpc: Add CONFIG_PPC64_ELF_ABI_V1 and CONFIG_PPC64_ELF_ABI_V2
  powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2}
  powerpc: Finalise cleanup around ABI use
  powerpc/ftrace: Make __ftrace_make_{nop/call}() common to PPC32 and
    PPC64
  powerpc/ftrace: Don't include ftrace.o for CONFIG_FTRACE_SYSCALLS
  powerpc/ftrace: Use CONFIG_FUNCTION_TRACER instead of
    CONFIG_DYNAMIC_FTRACE
  powerpc/ftrace: Remove ftrace_plt_tramps[]
  powerpc/ftrace: Use BRANCH_SET_LINK instead of value 1
  powerpc/ftrace: Use PPC_RAW_xxx() macros instead of opencoding.
  powerpc/ftrace: Use size macro instead of opencoding
  powerpc/ftrace: Simplify expected_nop_sequence()
  powerpc/ftrace: Minimise number of #ifdefs
  powerpc/inst: Add __copy_inst_from_kernel_nofault()
  powerpc/ftrace: Don't use copy_from_kernel_nofault() in
    module_trampoline_target()
  powerpc/inst: Remove PPC_INST_BRANCH
  powerpc/modules: Use PPC_LI macros instead of opencoding
  powerpc/inst: Remove PPC_INST_BL
  powerpc/opcodes: Remove unused PPC_INST_XXX macros

 arch/powerpc/Kconfig                     |   2 +-
 arch/powerpc/Makefile                    |  12 +-
 arch/powerpc/boot/Makefile               |   2 +
 arch/powerpc/include/asm/code-patching.h |  65 +++-
 arch/powerpc/include/asm/ftrace.h        |   4 +-
 arch/powerpc/include/asm/inst.h          |  13 +-
 arch/powerpc/include/asm/linkage.h       |   2 +-
 arch/powerpc/include/asm/module.h        |   2 -
 arch/powerpc/include/asm/ppc-opcode.h    |  22 +-
 arch/powerpc/include/asm/ppc_asm.h       |   4 +-
 arch/powerpc/include/asm/ptrace.h        |   2 +-
 arch/powerpc/include/asm/sections.h      |  24 +-
 arch/powerpc/include/asm/types.h         |   8 -
 arch/powerpc/kernel/fadump.c             |  13 +-
 arch/powerpc/kernel/head_64.S            |   2 +-
 arch/powerpc/kernel/interrupt_64.S       |   2 +-
 arch/powerpc/kernel/kprobes.c            |   6 +-
 arch/powerpc/kernel/misc_64.S            |   2 +-
 arch/powerpc/kernel/module.c             |   4 +-
 arch/powerpc/kernel/module_32.c          |  23 +-
 arch/powerpc/kernel/module_64.c          |   7 +-
 arch/powerpc/kernel/ptrace/ptrace.c      |   6 -
 arch/powerpc/kernel/trace/Makefile       |   5 +-
 arch/powerpc/kernel/trace/ftrace.c       | 375 +++++++----------------
 arch/powerpc/kvm/book3s_interrupts.S     |   2 +-
 arch/powerpc/kvm/book3s_rmhandlers.S     |   2 +-
 arch/powerpc/lib/code-patching.c         |  49 +--
 arch/powerpc/lib/feature-fixups.c        |   2 +-
 arch/powerpc/net/bpf_jit.h               |   4 +-
 arch/powerpc/net/bpf_jit_comp.c          |   2 +-
 arch/powerpc/net/bpf_jit_comp64.c        |   4 +-
 arch/powerpc/platforms/Kconfig.cputype   |   6 +
 32 files changed, 262 insertions(+), 416 deletions(-)

-- 
2.35.1