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config/ppc: select instruction set for IBM Power10

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For native build, enabling building the highest cpu_instruction_set
supported by the build host, including the new POWER10.

For cross compile, verifying that the compiler supports the
cpu_instruction_set specified in the cross-file

Signed-off-by: Thinh Tran <thinhtr@linux.vnet.ibm.com>
Reviewed-by: David Christensen <drc@linux.vnet.ibm.com>
This commit is contained in:
Thinh Tran 2021-10-12 18:54:32 +00:00 committed by David Marchand
parent 17a042376b
commit 7501968808
1 changed files with 83 additions and 0 deletions
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83
config/ppc/meson.build
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@ -24,6 +24,89 @@ if (cc.get_id() == 'gcc' and cc.version().version_compare('>=10.0') and
cc.version().version_compare('<12.0') and cc.has_argument('-Wno-psabi'))
add_project_arguments('-Wno-psabi', language: 'c')
endif
# If using a generic build, select the lowest common denominator
if platform == 'generic'
cpu_instruction_set = 'power8'
# If using a native build, select the highest cpu_instruction_set supported
# by the build host. (Native is the default platform type set in meson_options.txt.)
# When a cross compile is detected, verify that the compiler/assembler supports
# the requested cpu_instruction_set in the cross-file.
elif platform == 'native'
if meson.is_cross_build()
# cpu_instruction_set specified in cross-compile file as "cpu"
if host_machine.cpu() == 'power10'
test_p10 = '''
#include <stdio.h>
#include <altivec.h>
int main() {
__vector unsigned __int128 t, a, b;
#ifdef _ARCH_PWR10
__asm__("vcmpequq %0,%1,%2;" : "=v" (t) : "v" (a), "v" (b) : );
#else
#error POWER10 not supported
#endif
printf("%d", (int)t[0]);
return 0;
}
'''
if not cc.compiles(test_p10, args : '-mcpu=power10', name: 'Detect P10')
error('POWER10 requested but not supported')
endif
endif
else
# Using a POWER native build host. Assume P8 support, move to later CPUs
# if supported by the build host and the compiler. Detect the CPU used by
# the build host
detect_cpu = '''
#include <stdio.h>
#include <string.h>
#include <sys/auxv.h>
int main() {
char * platform = (char*) getauxval(AT_PLATFORM);
if (platform) {
if (!strncmp(platform,"power",5)) {
printf("%s", platform+5); return 0;
}
}
return 1;
}'''
result = cc.run(detect_cpu, name : 'Detect host CPU type')
if not result.compiled()
error('Failed to detect CPU type')
endif
cpu = result.stdout().to_int()
if cpu < 8
error('Unsupported POWER CPU detected')
else
# Found supported CPU on build host, verify compiler support
mcpu_flag = '-mcpu=power@0@'
if cc.has_argument(mcpu_flag.format(cpu))
# Compiler supports current detected CPU
elif cc.has_argument(mcpu_flag.format(cpu-1))
cpu = cpu-1
elif cc.has_argument(mcpu_flag.format(cpu-2))
cpu = cpu-2
else
error('Compiler does not support POWER@0@ platform'.format(cpu))
endif
if cpu > 8
cpu_instruction_set = 'power'+cpu.to_string()
else
error('Compiler does not support POWER@0@ platform'.format(cpu))
endif
endif
endif #end if not cross-build
else
# User has explicitly chosen a platform for the build, use that
if cc.has_argument('-mcpu=' + platform)
cpu_instruction_set = platform
else
error('User selected platform ' + platform + ' not supported by compiler')
endif
endif
machine_args = ['-mcpu=' + cpu_instruction_set, '-mtune=' + cpu_instruction_set]
dpdk_conf.set('RTE_MACHINE', cpu_instruction_set)
# Certain POWER9 systems can scale as high as 1536 LCORES, but setting such a
# high value can waste memory, cause timeouts in time limited autotests, and is