[PATCH 0/9] FP/VEC/VSX switching optimisations

[Cyril Bur]

Cover-letter for V1 of the series is at
https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-November/136350.html

Cover-letter for V2 of the series is at
https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-January/138054.html

Changes in V3:
Addressed review comments from Michael Neuling
 - Made commit message in 4/9 better reflect the patch
 - Removed overuse of #ifdef blocks and redundant condition in 5/9
 - Split 6/8 in two to better prepare for 7,8,9
 - Removed #ifdefs in 6/9

Changes in V4:
 - Addressed non ABI compliant ASM macros in 1/9
 - Fixed build breakage due to changing #ifdefs in V3 (6/9)
 - Reordered some conditions in if statements

Changes in V5:
 - Enhanced basic-asm.h to provide ABI independent macro as pointed out by
   Naveen Rao.
   - Tested for both BE and LE builds. Had to disable -flto from the
     selftests/powerpc Makefile as it didn't play well with the custom ASM.
 - Added some extra debugging output to the vmx_signal testcase
 - Fixed comments in testing code
 - Updated VSX test code to use GCC Altivec macros

Changes in V6:
 - Removed recursive definition of CFLAGS in math/Makefile
 - Corrected the use of the word param in favour of doubleword
 - Reordered some code in basic-asm.h and neatened some comments



Cyril Bur (9):
  selftests/powerpc: Test the preservation of FPU and VMX regs across
    syscall
  selftests/powerpc: Test preservation of FPU and VMX regs across
    preemption
  selftests/powerpc: Test FPU and VMX regs in signal ucontext
  powerpc: Explicitly disable math features when copying thread
  powerpc: Restore FPU/VEC/VSX if previously used
  powerpc: Prepare for splitting giveup_{fpu,altivec,vsx} in two
  powerpc: Add the ability to save FPU without giving it up
  powerpc: Add the ability to save Altivec without giving it up
  powerpc: Add the ability to save VSX without giving it up

 arch/powerpc/include/asm/processor.h               |   2 +
 arch/powerpc/include/asm/reg.h                     |   8 +
 arch/powerpc/include/asm/switch_to.h               |  13 +-
 arch/powerpc/kernel/asm-offsets.c                  |   2 +
 arch/powerpc/kernel/entry_64.S                     |  21 +-
 arch/powerpc/kernel/fpu.S                          |  25 +--
 arch/powerpc/kernel/ppc_ksyms.c                    |   4 -
 arch/powerpc/kernel/process.c                      | 168 +++++++++++++--
 arch/powerpc/kernel/vector.S                       |  45 +---
 tools/testing/selftests/powerpc/Makefile           |   3 +-
 tools/testing/selftests/powerpc/basic_asm.h        |  63 ++++++
 tools/testing/selftests/powerpc/math/.gitignore    |   6 +
 tools/testing/selftests/powerpc/math/Makefile      |  21 ++
 tools/testing/selftests/powerpc/math/fpu_asm.S     | 197 +++++++++++++++++
 tools/testing/selftests/powerpc/math/fpu_preempt.c | 113 ++++++++++
 tools/testing/selftests/powerpc/math/fpu_signal.c  | 135 ++++++++++++
 tools/testing/selftests/powerpc/math/fpu_syscall.c |  90 ++++++++
 tools/testing/selftests/powerpc/math/vmx_asm.S     | 234 +++++++++++++++++++++
 tools/testing/selftests/powerpc/math/vmx_preempt.c | 112 ++++++++++
 tools/testing/selftests/powerpc/math/vmx_signal.c  | 156 ++++++++++++++
 tools/testing/selftests/powerpc/math/vmx_syscall.c |  91 ++++++++
 21 files changed, 1426 insertions(+), 83 deletions(-)
 create mode 100644 tools/testing/selftests/powerpc/basic_asm.h
 create mode 100644 tools/testing/selftests/powerpc/math/.gitignore
 create mode 100644 tools/testing/selftests/powerpc/math/Makefile
 create mode 100644 tools/testing/selftests/powerpc/math/fpu_asm.S
 create mode 100644 tools/testing/selftests/powerpc/math/fpu_preempt.c
 create mode 100644 tools/testing/selftests/powerpc/math/fpu_signal.c
 create mode 100644 tools/testing/selftests/powerpc/math/fpu_syscall.c
 create mode 100644 tools/testing/selftests/powerpc/math/vmx_asm.S
 create mode 100644 tools/testing/selftests/powerpc/math/vmx_preempt.c
 create mode 100644 tools/testing/selftests/powerpc/math/vmx_signal.c
 create mode 100644 tools/testing/selftests/powerpc/math/vmx_syscall.c

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2.7.2