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powerpc: add sysconf support for cache geometries 

There is currently no "cross-platform" (x86 and POWER) support for
determining the cacheline size.

This patch adds support to sysconf() to correctly report cacheline sizes
based on the information in the auxilliary vector.

Thus, using sysconf() is a cross-platform (x86 and POWER) solution for
determining cacheline sizes.

Support is added (on powerpc) for:
_SC_LEVEL1_ICACHE_SIZE _SC_LEVEL1_ICACHE_ASSOC _SC_LEVEL1_ICACHE_LINESIZE
_SC_LEVEL1_DCACHE_SIZE _SC_LEVEL1_DCACHE_ASSOC _SC_LEVEL1_DCACHE_LINESIZE
_SC_LEVEL2_CACHE_SIZE  _SC_LEVEL2_CACHE_ASSOC  _SC_LEVEL2_CACHE_LINESIZE
_SC_LEVEL3_CACHE_SIZE  _SC_LEVEL3_CACHE_ASSOC  _SC_LEVEL3_CACHE_LINESIZE

	* sysdeps/unix/sysv/linux/powerpc/sysconf.c: New file.
	Add powerpc-specific overrides for L1, L2, L3 CACHE_SIZEs,
	CACHE_ASSOCs, and CACHE_LINESIZEs, retrieving from auxv.
	* sysdeps/unix/sysv/linux/powerpc/test-powerpc-linux-sysconf.c:
	New file.  Invoke newly supported sysconf values for powerpc,
	and report results.  If none are supported, report so.
	* sysdeps/unix/sysv/linux/powerpc/Makefile (tests):  Add new test,
	tst-sysconf.
This commit is contained in:
Paul Clarke 2017-06-09 14:36:22 -03:00 committed by Tulio Magno Quites Machado Filho
parent d6bd839b9a
commit cdfbe5037f
4 changed files with 181 additions and 0 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2017-06-09 Paul A. Clarke <pc@us.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/sysconf.c: New file.
Add powerpc-specific overrides for L1, L2, L3 CACHE_SIZEs,
CACHE_ASSOCs, and CACHE_LINESIZEs, retrieving from auxv.
* sysdeps/unix/sysv/linux/powerpc/test-powerpc-linux-sysconf.c:
New file. Invoke newly supported sysconf values for powerpc,
and report results. If none are supported, report so.
* sysdeps/unix/sysv/linux/powerpc/Makefile (tests): Add new test,
tst-sysconf.
2017-06-09 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* include/sys/auxv.h (__getauxval): Add a prototype and its

1
sysdeps/unix/sysv/linux/powerpc/Makefile
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@ -29,6 +29,7 @@ ifeq ($(subdir),misc)
sysdep_headers += bits/ppc.h
sysdep_routines += get_timebase_freq
tests += test-gettimebasefreq
tests += test-powerpc-linux-sysconf
endif
ifeq ($(subdir),nptl)

96
sysdeps/unix/sysv/linux/powerpc/sysconf.c Normal file
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@ -0,0 +1,96 @@
/* Get system-specific information at run-time. Linux/powerpc version.
Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sys/auxv.h>
static long linux_sysconf (int name);
static long
auxv2sysconf (unsigned long type)
{
long rc;
rc = __getauxval (type);
if (rc == 0)
{
__set_errno (EINVAL);
rc = -1;
}
return rc;
}
static long
auxv2sysconf_cache_associativity (unsigned long type)
{
long rc;
rc = auxv2sysconf (type);
if (rc != -1)
rc = (rc & 0xffff0000) >> 16;
return rc;
}
static long
auxv2sysconf_cache_linesize (unsigned long type)
{
long rc;
rc = auxv2sysconf (type);
if (rc != -1)
rc = rc & 0xffff;
return rc;
}
/* Get the value of the system variable NAME. */
long int
__sysconf (int name)
{
switch (name)
{
case _SC_LEVEL1_ICACHE_SIZE:
return auxv2sysconf (AT_L1I_CACHESIZE);
case _SC_LEVEL1_ICACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L1I_CACHEGEOMETRY);
case _SC_LEVEL1_ICACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L1I_CACHEGEOMETRY);
case _SC_LEVEL1_DCACHE_SIZE:
return auxv2sysconf (AT_L1D_CACHESIZE);
case _SC_LEVEL1_DCACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L1D_CACHEGEOMETRY);
case _SC_LEVEL1_DCACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L1D_CACHEGEOMETRY);
case _SC_LEVEL2_CACHE_SIZE:
return auxv2sysconf (AT_L2_CACHESIZE);
case _SC_LEVEL2_CACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L2_CACHEGEOMETRY);
case _SC_LEVEL2_CACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L2_CACHEGEOMETRY);
case _SC_LEVEL3_CACHE_SIZE:
return auxv2sysconf (AT_L3_CACHESIZE);
case _SC_LEVEL3_CACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L3_CACHEGEOMETRY);
case _SC_LEVEL3_CACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L3_CACHEGEOMETRY);
default:
return linux_sysconf (name);
}
}
/* Now the generic Linux version. */
#undef __sysconf
#define __sysconf static linux_sysconf
#include "../sysconf.c"

73
sysdeps/unix/sysv/linux/powerpc/test-powerpc-linux-sysconf.c Normal file
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@ -0,0 +1,73 @@
/* Check use of sysconf() for cache geometries.
Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
/* Test use of sysconf() to get cache sizes, cache set associativity
and cache line sizes. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <support/test-driver.h>
#define call_str(f, name) f(name, #name)
long
do_sysconf (int name, const char * str)
{
int rc = 0;
long val;
errno = 0;
val = sysconf (name);
if (val == -1) {
if (errno != EINVAL) {
printf("error: sysconf(%s): unexpected errno(%d)\n", str, errno);
exit (1);
}
printf ("info: sysconf(%s): unsupported\n", str);
rc = 1;
} else
printf ("sysconf(%s) = 0x%lx (%ld)\n", str, val, val);
return rc;
}
static int
do_test (void)
{
int rc = 0;
rc += call_str (do_sysconf, _SC_LEVEL1_ICACHE_SIZE);
rc += call_str (do_sysconf, _SC_LEVEL1_ICACHE_ASSOC);
rc += call_str (do_sysconf, _SC_LEVEL1_ICACHE_LINESIZE);
rc += call_str (do_sysconf, _SC_LEVEL1_DCACHE_SIZE);
rc += call_str (do_sysconf, _SC_LEVEL1_DCACHE_ASSOC);
rc += call_str (do_sysconf, _SC_LEVEL1_DCACHE_LINESIZE);
rc += call_str (do_sysconf, _SC_LEVEL2_CACHE_SIZE);
rc += call_str (do_sysconf, _SC_LEVEL2_CACHE_ASSOC);
rc += call_str (do_sysconf, _SC_LEVEL2_CACHE_LINESIZE);
rc += call_str (do_sysconf, _SC_LEVEL3_CACHE_SIZE);
rc += call_str (do_sysconf, _SC_LEVEL3_CACHE_ASSOC);
rc += call_str (do_sysconf, _SC_LEVEL3_CACHE_LINESIZE);
if (rc)
return EXIT_UNSUPPORTED;
return 0;
}
#include <support/test-driver.c>