xref: /dpdk/config/ppc/meson.build (revision b3fc5624) 
1# SPDX-License-Identifier: BSD-3-Clause
2# Copyright(c) 2018 Luca Boccassi <[email protected]>
3# Copyright(c) 2021 IBM Corporation
4
5if not dpdk_conf.get('RTE_ARCH_64')
6    error('Only 64-bit compiles are supported for this platform type')
7endif
8dpdk_conf.set('RTE_ARCH', 'ppc_64')
9dpdk_conf.set('RTE_ARCH_PPC_64', 1)
10
11# RHEL 7.x uses gcc 4.8.X which doesn't generate code for Power 9 CPUs,
12# though it will detect a Power 9 CPU when the "-mcpu=native" argument
13# is used, resulting in a build failure.
14power9_supported = cc.has_argument('-mcpu=power9')
15if not power9_supported
16    cpu_instruction_set = 'power8'
17    machine_args = ['-mcpu=power8', '-mtune=power8']
18    dpdk_conf.set('RTE_MACHINE','power8')
19endif
20
21# Suppress the gcc warning "note: the layout of aggregates containing
22# vectors with 4-byte alignment has changed in GCC 5".
23if (cc.get_id() == 'gcc' and cc.version().version_compare('>=10.0') and
24        cc.version().version_compare('<12.0') and cc.has_argument('-Wno-psabi'))
25    add_project_arguments('-Wno-psabi', language: 'c')
26endif
27# If using a generic build, select the lowest common denominator
28if platform == 'generic'
29     cpu_instruction_set = 'power8'
30# If using a native build, select the highest cpu_instruction_set supported
31# by the build host. (Native is the default platform type set in meson_options.txt.)
32# When a cross compile is detected, verify that the compiler/assembler supports
33# the requested cpu_instruction_set in the cross-file.
34elif platform == 'native'
35    if meson.is_cross_build()
36        # cpu_instruction_set specified in cross-compile file as "cpu"
37        if host_machine.cpu() == 'power10'
38            test_p10 = '''
39#include <stdio.h>
40#include <altivec.h>
41int main() {
42  __vector unsigned __int128 t, a, b;
43#ifdef _ARCH_PWR10
44  __asm__("vcmpequq %0,%1,%2;" : "=v" (t) : "v" (a), "v" (b) : );
45#else
46#error POWER10 not supported
47#endif
48  printf("%d", (int)t[0]);
49  return 0;
50}
51'''
52            if not cc.compiles(test_p10, args : '-mcpu=power10', name: 'Detect P10')
53                  error('POWER10 requested but not supported')
54            endif
55        endif
56    else
57        # Using a POWER native build host. Assume P8 support, move to later CPUs
58        # if supported by the build host and the compiler. Detect the CPU used by
59        # the build host
60        detect_cpu = '''
61#include <stdio.h>
62#include <string.h>
63#include <sys/auxv.h>
64int main() {
65  char * platform = (char*) getauxval(AT_PLATFORM);
66  if (platform) {
67    if (!strncmp(platform,"power",5)) {
68      printf("%s", platform+5); return 0;
69    }
70  }
71  return 1;
72}'''
73        result = cc.run(detect_cpu, name : 'Detect host CPU type')
74        if not result.compiled()
75            error('Failed to detect CPU type')
76        endif
77        cpu = result.stdout().to_int()
78        if cpu < 8
79            error('Unsupported POWER CPU detected')
80        else
81            # Found supported CPU on build host, verify compiler support
82            mcpu_flag = '-mcpu=power@0@'
83            if cc.has_argument(mcpu_flag.format(cpu))
84                # Compiler supports current detected CPU
85            elif cc.has_argument(mcpu_flag.format(cpu-1))
86                cpu = cpu-1
87            elif cc.has_argument(mcpu_flag.format(cpu-2))
88                cpu = cpu-2
89            else
90                error('Compiler does not support POWER@0@ platform'.format(cpu))
91            endif
92            if cpu >= 8
93                cpu_instruction_set = 'power'+cpu.to_string()
94            else
95                error('Compiler does not support POWER@0@ platform'.format(cpu))
96            endif
97        endif
98    endif  #end if not cross-build
99else
100    # User has explicitly chosen a platform for the build, use that
101    if cc.has_argument('-mcpu=' + platform)
102        cpu_instruction_set = platform
103    else
104        error('User selected platform ' + platform + ' not supported by compiler')
105    endif
106endif
107machine_args = ['-mcpu=' + cpu_instruction_set, '-mtune=' + cpu_instruction_set]
108dpdk_conf.set('RTE_MACHINE', cpu_instruction_set)
109
110
111# Certain POWER9 systems can scale as high as 1536 LCORES, but setting such a
112# high value can waste memory, cause timeouts in time limited autotests, and is
113# unlikely to be used in many production situations.  Similarly, keeping the
114# default 64 LCORES seems too small as most POWER9 dual socket systems will have
115# at least 128 LCORES available.  Set RTE_MAX_LCORE to 128 for POWER systems as
116# a compromise.
117dpdk_conf.set('RTE_MAX_LCORE', 128)
118
119# POWER systems do not allocate NUMA nodes sequentially.  A dual socket system
120# will have CPUs associated with NUMA nodes 0 & 8, so ensure that the second
121# NUMA node will be supported by setting RTE_MAX_NUMA_NODES to 16. High end
122# systems can scale even higher with as many as 32 NUMA nodes.
123dpdk_conf.set('RTE_MAX_NUMA_NODES', 16)
124
125dpdk_conf.set('RTE_CACHE_LINE_SIZE', 128)
126