Re: [PATCH v3 6/6] test: add checks for cpu flags on armv8

["Hunt, David" <david.hunt@intel.com>]

On 02/11/2015 06:32, Jerin Jacob wrote:
> On Fri, Oct 30, 2015 at 04:28:25PM +0000, Hunt, David wrote:

--snip--

>
> Hi Jan and Dave,
>
> I have reviewed your patches for arm[64] support. Please check the
> review comments.

Hi Jerin,

I'm looking at the comments now, and working on getting the suggested 
changes merged into the patch-set.

> Cavium would like to contribute on armv8 port and remaining libraries
> (ACL, LPM, HASH) implementation for armv8. Currently i am re-basing
> our ACL,HASH libraries implementation based on existing patches.
> Happy to work with you guys to have full fledged armv8 support for DPDK.
>
> Jerin

Thanks for that, it's good news indeed.

> other query on rte_cpu_get_flag_enabled for armv8,
> I have tried to run the existing patches on armv8-thunderX platform.
> But there application start failure due to mismatch in
> rte_cpu_get_flag_enabled() encoding.
>
> In my platform rte_cpu_get_flag_enabled() works based on
> AT_HWCAP with following values[1] which different from
> existing lib/librte_eal/common/include/arch/arm/rte_cpuflags.h
>
> [1]http://lxr.free-electrons.com/source/arch/arm64/include/uapi/asm/hwcap.h
>
> In order to debug this, Could provide the following
> values in tested armv8 platform. Look like its running 32bit compatible
> mode in your environment

I'm using a Gigabyte MP30AR0 motherboard with an 8-core X-Gene, Running 
a 4.3.0-rc6 kernel.
Here's the information on the cpu_flags issue you requested:

> AT_SYSINFO_EHDR: 0x3ff859f0000
> AT_??? (0x26): 0x430f0a10
> AT_HWCAP:        fb
> AT_PAGESZ:       65536
> AT_CLKTCK:       100
> AT_PHDR:         0x400040
> AT_PHENT:        56
> AT_PHNUM:        7
> AT_BASE:         0x3ff85a00000
> AT_FLAGS:        0x0
> AT_ENTRY:        0x401900
> AT_UID:          0
> AT_EUID:         0
> AT_GID:          0
> AT_EGID:         0
> AT_SECURE:       0
> AT_RANDOM:       0x3ffef1c7988
> AT_EXECFN:       /bin/sleep
> AT_PLATFORM:     aarch64

root@mp30ar0:~# LD_SHOW_AUXV=1 sleep 1000
AT_SYSINFO_EHDR: 0x7f7956d000
AT_HWCAP:        7
AT_PAGESZ:       4096
AT_CLKTCK:       100
AT_PHDR:         0x400040
AT_PHENT:        56
AT_PHNUM:        7
AT_BASE:         0x7f79543000
AT_FLAGS:        0x0
AT_ENTRY:        0x401900
AT_UID:          0
AT_EUID:         0
AT_GID:          0
AT_EGID:         0
AT_SECURE:       0
AT_RANDOM:       0x7ffcaf2e48
AT_EXECFN:       /bin/sleep
AT_PLATFORM:     aarch64

> root@arm64:/export/dpdk-arm64# zcat /proc/config.gz  | grep CONFIG_COMPAT
> # CONFIG_COMPAT_BRK is not set
> CONFIG_COMPAT_BINFMT_ELF=y
> CONFIG_COMPAT=y
> CONFIG_COMPAT_NETLINK_MESSAGES=y

root@mp30ar0:~# zcat /proc/config.gz  | grep CONFIG_COMPAT
# CONFIG_COMPAT_BRK is not set
CONFIG_COMPAT_OLD_SIGACTION=y
CONFIG_COMPAT_BINFMT_ELF=y
CONFIG_COMPAT=y


> root@arm64:/export/dpdk-arm64# cat /proc/cpuinfo
> Processor       : AArch64 Processor rev 0 (aarch64)
> processor       : 0
> processor       : 1
--snip--
> processor       : 46
> processor       : 47
> Features        : fp asimd aes pmull sha1 sha2 crc32
> CPU implementer : 0x43
> CPU architecture: AArch64
> CPU variant     : 0x0
> CPU part        : 0x0a1
> CPU revision    : 0

root@mp30ar0:~# cat /proc/cpuinfo
processor       : 0
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 1
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 2
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 3
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 4
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 5
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 6
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

processor       : 7
Features        : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 1

root@mp30ar0:~#

Hope this helps.

Regards,
Dave.