From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: build scripts for the WIP xenomai porting to kernel 5.4
References: <20201014132459.GB24671@linux.intel.com>
From: Jan Kiszka <jan.kiszka@siemens.com>
Message-ID: <8e59bc35-84ae-78be-8296-4f2367e8e844@siemens.com>
Date: Thu, 15 Oct 2020 16:20:11 +0200
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To: Fino Meng <fino.meng@linux.intel.com>, xenomai@xenomai.org
Cc: fino.meng@intel.com, quirin.gylstorff@siemens.com, henning.schild@siemens.com, florent.pirou@intel.com, rick.y.wang@intel.com, hongzhan.chen@intel.com

On 14.10.20 15:25, Fino Meng wrote:
> hi team,
> 
> I just updated the scripts to build the WIP version xenomai porting to
> kernel 5.4, just follow the steps:
> 
> git clone https://github.com/finomeng/xenomai-mirror.git /tmp/xenomai-mirror.next-5.4
> cd /tmp/xenomai-mirror.next-5.4
> git checkout -t origin/wip/next-5.4-porting
> 
> git clone https://github.com/intel/linux-stable-xenomai /tmp/kernel
> cd /tmp/kernel
> git checkout -t review/5.4.59/stable/ipipe-x86
> 
> ./patching-xenomai2kernel.sh
> 
> cp config_xenomai.kernel_debug .config
> make olddefconfig
> ./build-debpkg.sh
> 
> 
> I didn't put it togethter with ISAR/Debian yet. I test it with a PC with Debian 10 installed.
> 
> if no error, linux-image-*.deb and linux-headers-*.deb should generated outside kernel folder,
> copy them to your target test device with already installed a Debian/Ubuntu,
> install the deb with "dpkg -i", update-grub should be called during install linux-image-*.deb
> reboot and select to boot the new kernel in grub's menu
> 
> the build steps also written in patching-xenomai2kernel.sh and build-debpkg.sh
> 
> switchtest will fail in current version, for example: "./switchtest rtk_fp_ufpp0"
> will print:
> 
> r0: 2147483648 != 1000
> r1: 2147483648 != 1000
> r2: 2147483648 != 1000
> r3: 2147483648 != 1000
> r4: 2147483648 != 1000
> r5: 2147483648 != 1000
> r6: 2147483648 != 1000
> r7: 2147483648 != 1000
> ymm0: 2676586395008836901/0 != 1000/1000
> ymm1: 71776119061217280/0 != 1000/1000
> ymm2: 0/0 != 1000/1000
> ymm3: 1000/0 != 1000/1000
> ymm4: 1000/0 != 1000/1000
> ymm5: 1000/0 != 1000/1000
> ymm6: 1000/0 != 1000/1000
> ymm7: 1000/0 != 1000/1000
> Error after context switch from task 1(rtk_fp_ufpp0-1) to task 0(sleeper_ufps0-0),
> FPU registers were set to 0 (maybe task sleeper_ufps0-0)
> 
> if meet more questions just write to me, thanks!
> 
> BR fino
> 

I can reproduce in KVM and poked around a bit, though without finding
the needle yet. Likely, there are multiple aspects. The change in
upstream to FPU switching on user-return is a hot lead, but it takes a
bit to fully grasp that and map it on our scenarios with Xenomai.

Jan

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