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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: Jerin Jacob <jerinjacobk@gmail.com>,
	Chengwen Feng <fengchengwen@huawei.com>
Cc: "thomas@monjalon.net" <thomas@monjalon.net>,
	"Ferruh Yigit" <ferruh.yigit@intel.com>, dpdk-dev <dev@dpdk.org>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"Ruifeng Wang" <Ruifeng.Wang@arm.com>,
	"Jan Viktorin" <viktorin@rehivetech.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Juraj Linkeš" <juraj.linkes@pantheon.tech>, nd <nd@arm.com>,
	"Honnappa Nagarahalli" <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v4 1/2] config/arm: select most suitable -march for kunpeng soc
Date: Thu, 13 May 2021 23:12:41 +0000	[thread overview]
Message-ID: <DBAPR08MB5814D7DEF28958D5E9CDEC4F98519@DBAPR08MB5814.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <CALBAE1MeLb+ZKSidRJbCVmajFMpp+PsoMSQcU1reduMFa1UApQ@mail.gmail.com>

<snip>
> 
> On Thu, May 13, 2021 at 6:41 PM Chengwen Feng
> <fengchengwen@huawei.com> wrote:
> >
> > Currently, the soc_kunpeng930 declares '-march=armv8.2-a+crypto+sve',
> > but some compiler doesn't recognize the march because it doesn't
> > support sve.
> >
> > To solve this bug we use the following scheme:
> > 1. Define 'march_base' tuple which defines support march, it should
> > arrange from lower to higher.
> > e.g. 'march_base' : ['-march=armv8-a', '-march=armv8.2-a'] 2. Define
> > 'march_feature' tuple which defines support feature.
> > e.g. 'march_feature' : ['crypto', 'sve'] 3. Select the most suitable
> > march+feature combination based on 'march_base' and 'march_feature'
> > tuples.
> > 4. Use the selected march+feature combination as the default
> > machine_args.
> >
> > Fixes: 7cf32a22b240 ("config/arm: add Hisilicon kunpeng")
> >
> > Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> > ---
> >  config/arm/meson.build | 27 +++++++++++++++++++++++++--
> >  1 file changed, 25 insertions(+), 2 deletions(-)
> >
> > diff --git a/config/arm/meson.build b/config/arm/meson.build index
> > 3f34ec9..8551a80 100644
> > --- a/config/arm/meson.build
> > +++ b/config/arm/meson.build
> > @@ -149,7 +149,9 @@ implementer_hisilicon = {
> >      ],
> >      'part_number_config': {
> >          '0xd01': {
> > -            'machine_args': ['-march=armv8.2-a+crypto', '-mtune=tsv110'],
> > +            'march_base' : ['-march=armv8-a', '-march=armv8.2-a'],
If the compiler supports armv8.1-a, you need to choose armv8.1-a.

> 
> Another target has the same issue. Could you fix that all together as it is
> generic problem in the existing infrastructure.
I think this needs to be more generic solution. IMO, the requirement is as follows:

1) We need to pick the most closest march_base supported by the compiler. For ex: If the SoC support v8.2 and the compiler supports v8.1, we need to pick v8.1
2) SoCs are allowed to support a base march version + hand picked features from the next 1 base marchs. i.e. armv8.x compliant implementation can include any features from armv8.(x + 1). Please refer to  Arm-ARM section A2 for more details. So, it is possible that the compiler supports a base march and a bunch of optional features from the next version. We need to test all the features allowed by the architecture and pick the ones that are supported in the compiler.

> 
> 
> > +            'march_feature' : ['crypto'],
> > +            'machine_args': ['-mtune=tsv110'],
> >              'flags': [
> >                  ['RTE_MACHINE', '"Kunpeng 920"'],
> >                  ['RTE_ARM_FEATURE_ATOMICS', true], @@ -158,7 +160,9
> > @@ implementer_hisilicon = {
> >              ]
> >          },
> >          '0xd02': {
> > -            'machine_args': ['-march=armv8.2-a+crypto+sve'],
> > +            'march_base' : ['-march=armv8-a', '-march=armv8.2-a'],
> > +            'march_feature' : ['crypto', 'sve'],
> > +            'machine_args': [],
> >              'flags': [
> >                  ['RTE_MACHINE', '"Kunpeng 930"'],
> >                  ['RTE_ARM_FEATURE_ATOMICS', true], @@ -449,8 +453,27
> > @@ else
> >      # add/overwrite flags in the proper order
> >      dpdk_flags = flags_common + implementer_config['flags'] +
> > part_number_config.get('flags', []) + soc_flags
> >
> > +    # select the most suitable march+feature combination
> > +    machine_march = []
> > +    if part_number_config.has_key('march_base')
> > +        foreach arch: part_number_config['march_base']
> > +            if cc.has_argument(arch)
> > +                machine_march = arch # Set the higher supported arch as
> possible
> > +            endif
> > +        endforeach
> > +    endif
> > +    if part_number_config.has_key('march_feature')
> > +        foreach feature: part_number_config['march_feature']
> > +            tmp_machine_march = machine_march + '+' + feature
> > +            if cc.has_argument(tmp_machine_march)
> > +                machine_march = tmp_machine_march # Set the more supported
> feature as possible
> > +            endif
> > +        endforeach
> > +    endif
> > +
> >      # apply supported machine args
> >      machine_args = [] # Clear previous machine args
> > +    machine_args += machine_march
> >      foreach flag: part_number_config['machine_args']
> >          if cc.has_argument(flag)
> >              machine_args += flag
> > --
> > 2.8.1
> >

  reply	other threads:[~2021-05-13 23:12 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12  8:28 [dpdk-dev] [PATCH 0/2] bugfix for Kunpeng930 SVE compile Chengwen Feng
2021-05-12  8:28 ` [dpdk-dev] [PATCH 1/2] config/arm: add non-SVE march for soc kunpeng930 Chengwen Feng
2021-05-12  8:44   ` Jerin Jacob
2021-05-12 23:00     ` Honnappa Nagarahalli
2021-05-13  4:49       ` fengchengwen
2021-05-12  8:28 ` [dpdk-dev] [PATCH 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-12 23:12   ` Honnappa Nagarahalli
2021-05-12 23:21     ` Honnappa Nagarahalli
2021-05-13  0:51       ` fengchengwen
2021-05-13 20:42         ` Honnappa Nagarahalli
2021-05-13 10:04     ` Bruce Richardson
2021-05-13  4:41 ` [dpdk-dev] [PATCH v2 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-13  4:41   ` [dpdk-dev] [PATCH v2 1/2] config/arm: select best -march parameter for kunpeng soc Chengwen Feng
2021-05-13  4:41   ` [dpdk-dev] [PATCH v2 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-13  6:16 ` [dpdk-dev] [PATCH v3 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-13  6:16   ` [dpdk-dev] [PATCH v3 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-05-13  6:16   ` [dpdk-dev] [PATCH v3 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-13 13:08 ` [dpdk-dev] [PATCH v4 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-13 13:08   ` [dpdk-dev] [PATCH v4 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-05-13 15:24     ` Jerin Jacob
2021-05-13 23:12       ` Honnappa Nagarahalli [this message]
2021-05-14 10:23         ` fengchengwen
2021-05-18 13:25           ` Honnappa Nagarahalli
2021-05-18 13:45             ` Jerin Jacob
2021-05-13 13:08   ` [dpdk-dev] [PATCH v4 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-13 22:19     ` Honnappa Nagarahalli
2021-05-14  2:53       ` fengchengwen
2021-05-14  9:53 ` [dpdk-dev] [PATCH v5 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-14  9:53   ` [dpdk-dev] [PATCH v5 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-05-14  9:53   ` [dpdk-dev] [PATCH v5 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-14 14:12     ` Honnappa Nagarahalli
2021-05-18 12:41       ` fengchengwen
2021-05-18 13:11         ` Honnappa Nagarahalli
2021-05-18 13:12           ` Honnappa Nagarahalli
2021-05-18 13:24         ` Ferruh Yigit
2021-05-18 16:27       ` Ferruh Yigit
2021-05-19  0:23         ` fengchengwen
2021-05-19  8:08         ` David Marchand
2021-05-19  9:27           ` Ferruh Yigit
2021-05-19 12:16             ` fengchengwen
2021-05-19 12:37               ` David Marchand
2021-05-19 13:35                 ` fengchengwen
2021-05-18 14:40     ` Ferruh Yigit
2021-05-18 15:15       ` Bruce Richardson
2021-05-18 16:12         ` Ferruh Yigit
2021-05-18 15:48       ` Honnappa Nagarahalli
2021-05-18 16:00         ` Ferruh Yigit
2021-05-18 16:12           ` Honnappa Nagarahalli
2021-05-18 16:37             ` Ferruh Yigit
2021-05-19  0:18               ` fengchengwen
2021-05-19 13:25 ` [dpdk-dev] [PATCH v6 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-19 13:25   ` [dpdk-dev] [PATCH v6 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-05-19 14:05     ` Jerin Jacob
2021-05-20 22:38       ` Honnappa Nagarahalli
2021-05-19 13:25   ` [dpdk-dev] [PATCH v6 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-19 15:02     ` Ferruh Yigit
2021-05-20  1:11       ` fengchengwen
2021-05-20  7:57         ` Ferruh Yigit
2021-05-20  8:24     ` Ruifeng Wang
2021-05-20 10:55       ` fengchengwen
2021-05-21  5:21         ` Ruifeng Wang
2021-05-21  6:53           ` fengchengwen
2021-05-24  5:38             ` Ruifeng Wang
2021-05-24  8:43               ` fengchengwen
2021-05-24 10:03                 ` Ruifeng Wang
2021-05-24 13:15                   ` fengchengwen
2021-05-24 13:12 ` [dpdk-dev] [PATCH v7 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-24 13:12   ` [dpdk-dev] [PATCH v7 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-05-24 13:12   ` [dpdk-dev] [PATCH v7 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-24 13:23 ` [dpdk-dev] [PATCH v8 0/2] bugfix for Kunpeng SVE compile Chengwen Feng
2021-05-24 13:23   ` [dpdk-dev] [PATCH v8 1/2] config/arm: select most suitable -march for kunpeng soc Chengwen Feng
2021-06-17  7:03     ` Thomas Monjalon
2021-06-17 23:33       ` Honnappa Nagarahalli
2021-06-21  0:52         ` fengchengwen
2021-06-23  8:08           ` Thomas Monjalon
2021-06-23  8:24             ` fengchengwen
2021-05-24 13:23   ` [dpdk-dev] [PATCH v8 2/2] net/hns3: refactor SVE code compile method Chengwen Feng
2021-05-25  6:04     ` Ruifeng Wang
2021-05-27  7:07       ` Fengchengwen
2021-06-12  7:09       ` fengchengwen

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