build/ppc: enable build support for Power10
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Commit Message
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>
---
config/ppc/meson.build | 83 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
@@ -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