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From: <pbhagavatula@marvell.com>
To: <jerinj@marvell.com>, <juraj.linkes@pantheon.tech>, <nd@arm.com>, "Ruifeng
Wang" <ruifeng.wang@arm.com>, Bruce Richardson <bruce.richardson@intel.com>
CC: <dev@dpdk.org>, Pavan Nikhilesh <pbhagavatula@marvell.com>
Subject: [PATCH v2 2/3] config/arm: add support for fallback march
Date: Fri, 2 Feb 2024 03:27:30 +0530
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From: Pavan Nikhilesh <pbhagavatula@marvell.com>
Some ARM CPUs have specific march requirements and
are not compatible with the supported march list.
Add fallback march in case the mcpu and the march
advertised in the part_number_config are not supported
by the compiler.
Example
mcpu = neoverse-n2
march = armv9-a
fallback_march = armv8.5-a
mcpu, march not supported
machine_args = ['-march=armv8.5-a']
mcpu, march, fallback_march not supported
least march supported = armv8-a
machine_args = ['-march=armv8-a']
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
config/arm/meson.build | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/config/arm/meson.build b/config/arm/meson.build
index ba859bd060..6f2308f2fa 100644
--- a/config/arm/meson.build
+++ b/config/arm/meson.build
@@ -94,6 +94,7 @@ part_number_config_arm = {
'0xd49': {
'march': 'armv9-a',
'march_features': ['sve2'],
+ 'fallback_march': 'armv8.5-a',
'mcpu': 'neoverse-n2',
'flags': [
['RTE_MACHINE', '"neoverse-n2"'],
@@ -708,6 +709,7 @@ if update_flags
# probe supported archs and their features
candidate_march = ''
+ fallback_march = ''
if part_number_config.has_key('march')
if part_number_config.get('force_march', false) or candidate_mcpu != ''
if cc.has_argument('-march=' + part_number_config['march'])
@@ -728,10 +730,17 @@ if update_flags
# highest supported march version found
break
endif
+ if (supported_march == part_number_config['fallback_march']
+ and cc.has_argument('-march=' + supported_march))
+ fallback_march = supported_march
+ endif
endforeach
endif
if candidate_march != part_number_config['march']
+ if fallback_march != ''
+ candidate_march = fallback_march
+ endif
warning('Configuration march version is @0@, not supported.'
.format(part_number_config['march']))
if candidate_march != ''
--
2.25.1