[v2,5/6] scripts: Added Vector Length Set test helper script

  From: Naohiro Tamura <naohirot@jp.fujitsu.com>

Let me send the whole updated patch.
Thanks.
Naohiro

-- >8 --
Subject: [PATCH v2 5/6] aarch64: Added Vector Length Set test helper script

This patch is a test helper script to change Vector Length for child
process. This script can be used as test-wrapper for 'make check'.

Usage examples:

~/build$ make check subdirs=string \
test-wrapper='~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16'

~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16 \
make test t=string/test-memcpy

~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 32 \
./debugglibc.sh string/test-memmove

~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 64 \
./testrun.sh string/test-memset
---
 INSTALL                                   |  4 ++
 manual/install.texi                       |  3 +
 sysdeps/unix/sysv/linux/aarch64/vltest.py | 82 +++++++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100755 sysdeps/unix/sysv/linux/aarch64/vltest.py
  

The 05/20/2021 07:34, Naohiro Tamura wrote:
> From: Naohiro Tamura <naohirot@jp.fujitsu.com>
> 
> Let me send the whole updated patch.
> Thanks.
> Naohiro
> 
> -- >8 --
> Subject: [PATCH v2 5/6] aarch64: Added Vector Length Set test helper script
> 
> This patch is a test helper script to change Vector Length for child
> process. This script can be used as test-wrapper for 'make check'.
> 
> Usage examples:
> 
> ~/build$ make check subdirs=string \
> test-wrapper='~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16'
> 
> ~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16 \
> make test t=string/test-memcpy
> 
> ~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 32 \
> ./debugglibc.sh string/test-memmove
> 
> ~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 64 \
> ./testrun.sh string/test-memset

thanks, this is ok for master.
i will commit it.


> ---
>  INSTALL                                   |  4 ++
>  manual/install.texi                       |  3 +
>  sysdeps/unix/sysv/linux/aarch64/vltest.py | 82 +++++++++++++++++++++++
>  3 files changed, 89 insertions(+)
>  create mode 100755 sysdeps/unix/sysv/linux/aarch64/vltest.py
> 
> diff --git a/INSTALL b/INSTALL
> index 065a568585e6..bc761ab98bbf 100644
> --- a/INSTALL
> +++ b/INSTALL
> @@ -380,6 +380,10 @@ the same syntax as 'test-wrapper-env', the only difference in its
>  semantics being starting with an empty set of environment variables
>  rather than the ambient set.
>  
> +   For AArch64 with SVE, when testing the GNU C Library, 'test-wrapper'
> +may be set to "SRCDIR/sysdeps/unix/sysv/linux/aarch64/vltest.py
> +VECTOR-LENGTH" to change Vector Length.
> +
>  Installing the C Library
>  ========================
>  
> diff --git a/manual/install.texi b/manual/install.texi
> index eb41fbd0b5ab..f1d858fb789c 100644
> --- a/manual/install.texi
> +++ b/manual/install.texi
> @@ -418,6 +418,9 @@ use has the same syntax as @samp{test-wrapper-env}, the only
>  difference in its semantics being starting with an empty set of
>  environment variables rather than the ambient set.
>  
> +For AArch64 with SVE, when testing @theglibc{}, @samp{test-wrapper}
> +may be set to "@var{srcdir}/sysdeps/unix/sysv/linux/aarch64/vltest.py
> +@var{vector-length}" to change Vector Length.
>  
>  @node Running make install
>  @appendixsec Installing the C Library
> diff --git a/sysdeps/unix/sysv/linux/aarch64/vltest.py b/sysdeps/unix/sysv/linux/aarch64/vltest.py
> new file mode 100755
> index 000000000000..bed62ad151e0
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/aarch64/vltest.py
> @@ -0,0 +1,82 @@
> +#!/usr/bin/python3
> +# Set Scalable Vector Length test helper
> +# Copyright (C) 2021 Free Software Foundation, Inc.
> +# This file is part of the GNU C Library.
> +#
> +# The GNU C Library is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU Lesser General Public
> +# License as published by the Free Software Foundation; either
> +# version 2.1 of the License, or (at your option) any later version.
> +#
> +# The GNU C Library is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +# Lesser General Public License for more details.
> +#
> +# You should have received a copy of the GNU Lesser General Public
> +# License along with the GNU C Library; if not, see
> +# <https://www.gnu.org/licenses/>.
> +"""Set Scalable Vector Length test helper.
> +
> +Set Scalable Vector Length for child process.
> +
> +examples:
> +
> +~/build$ make check subdirs=string \
> +test-wrapper='~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16'
> +
> +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 16 \
> +make test t=string/test-memcpy
> +
> +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 32 \
> +./debugglibc.sh string/test-memmove
> +
> +~/build$ ~/glibc/sysdeps/unix/sysv/linux/aarch64/vltest.py 64 \
> +./testrun.sh string/test-memset
> +"""
> +import argparse
> +from ctypes import cdll, CDLL
> +import os
> +import sys
> +
> +EXIT_SUCCESS = 0
> +EXIT_FAILURE = 1
> +EXIT_UNSUPPORTED = 77
> +
> +AT_HWCAP = 16
> +HWCAP_SVE = (1 << 22)
> +
> +PR_SVE_GET_VL = 51
> +PR_SVE_SET_VL = 50
> +PR_SVE_SET_VL_ONEXEC = (1 << 18)
> +PR_SVE_VL_INHERIT = (1 << 17)
> +PR_SVE_VL_LEN_MASK = 0xffff
> +
> +def main(args):
> +    libc = CDLL("libc.so.6")
> +    if not libc.getauxval(AT_HWCAP) & HWCAP_SVE:
> +        print("CPU doesn't support SVE")
> +        sys.exit(EXIT_UNSUPPORTED)
> +
> +    libc.prctl(PR_SVE_SET_VL,
> +               args.vl[0] | PR_SVE_SET_VL_ONEXEC | PR_SVE_VL_INHERIT)
> +    os.execvp(args.args[0], args.args)
> +    print("exec system call failure")
> +    sys.exit(EXIT_FAILURE)
> +
> +if __name__ == '__main__':
> +    parser = argparse.ArgumentParser(description=
> +            "Set Scalable Vector Length test helper",
> +            formatter_class=argparse.ArgumentDefaultsHelpFormatter)
> +
> +    # positional argument
> +    parser.add_argument("vl", nargs=1, type=int,
> +                        choices=range(16, 257, 16),
> +                        help=('vector length '\
> +                              'which is multiples of 16 from 16 to 256'))
> +    # remainDer arguments
> +    parser.add_argument('args', nargs=argparse.REMAINDER,
> +                        help=('args '\
> +                              'which is passed to child process'))
> +    args = parser.parse_args()
> +    main(args)
> -- 
> 2.17.1
>