+Jerin, Hemant, Dharmik
<snip>
Hi Vimal,
Few comments inline.
>
> Add meson build configuration for Graviton2 platform with 64-bit ARM
> Neoverse N1 cores. This patch makes the following changes to generic
> Neoverse N1 config:
>
> 1. increase lcore limit to 64
> 2. increase memory support to 1TB
There will be multiple SoCs with N1 cores. All of them will have the same
implementor ID and part number. But, they will have different values for these
configurable parameters.
IMO, from usage perspective, we have 2 cases:
1) Ability to build a portable binary that can run on multiple Arm SoCs (for
ex: BlueField, thunderx1, thunderx2, N1SDP, Graviton2 etc)
2) Ability to build a binary which would run only on a SoC it was compiled for
and provide the most optimized binary for that SoC. But, this may not be
portable.
For 1) we have default march.
For 2) we do not have the capability today in meson build (at least, this is my
understanding, please correct me if I am wrong). In this case, the user knows
the target platform for compilation. IMO, we should add the capability to take
the target platform as an input from the user (similar to the make build
system) and Graviton2 can be one such target platform.
> 3. remove +crc from -march as that is default when setting armv8.2
>
> For more information about Graviton2 platform, refer to:
> https://aws.amazon.com/ec2/graviton/
>
> Signed-off-by: Vimal Chungath <[email protected]>
> ---
> config/arm/arm64_graviton2_linux_gcc | 17 +++++++++++++++++
> config/arm/meson.build | 12 +++++++++++-
> 2 files changed, 28 insertions(+), 1 deletion(-) create mode 100644
> config/arm/arm64_graviton2_linux_gcc
>
> diff --git a/config/arm/arm64_graviton2_linux_gcc
> b/config/arm/arm64_graviton2_linux_gcc
> new file mode 100644
> index 000000000..022e06303
> --- /dev/null
> +++ b/config/arm/arm64_graviton2_linux_gcc
> @@ -0,0 +1,17 @@
> +[binaries]
> +c = 'aarch64-linux-gnu-gcc'
> +cpp = 'aarch64-linux-gnu-cpp'
> +ar = 'aarch64-linux-gnu-gcc-ar'
> +strip = 'aarch64-linux-gnu-strip'
> +pkgconfig = 'aarch64-linux-gnu-pkg-config'
> +pcap-config = ''
> +
> +[host_machine]
> +system = 'linux'
> +cpu_family = 'aarch64'
> +cpu = 'armv8-a'
> +endian = 'little'
> +
> +[properties]
> +implementor_id = '0x41'
> +implementor_pn = '0xd0c'
> diff --git a/config/arm/meson.build b/config/arm/meson.build index
> 8728051d5..64e277ebc 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -86,6 +86,16 @@ flags_octeontx2_extra = [
> ['RTE_ARM_FEATURE_ATOMICS', true],
> ['RTE_EAL_IGB_UIO', false],
> ['RTE_USE_C11_MEM_MODEL', true]]
> +flags_n1generic_extra = [
> + ['RTE_MACHINE', '"neoverse-n1"'],
> + ['RTE_MAX_LCORE', 64],
> + ['RTE_CACHE_LINE_SIZE', 64],
> + ['RTE_ARM_FEATURE_ATOMICS', true],
> + ['RTE_USE_C11_MEM_MODEL', true],
> + ['RTE_MAX_MEM_MB', 1048576],
> + ['RTE_MAX_NUMA_NODES', 1],
> + ['RTE_EAL_NUMA_AWARE_HUGEPAGES', false],
> + ['RTE_LIBRTE_VHOST_NUMA', false]]
>
> machine_args_generic = [
> ['default', ['-march=armv8-a+crc']],
> @@ -97,7 +107,7 @@ machine_args_generic = [
> ['0xd09', ['-mcpu=cortex-a73']],
> ['0xd0a', ['-mcpu=cortex-a75']],
> ['0xd0b', ['-mcpu=cortex-a76']],
> - ['0xd0c', ['-march=armv8.2-a+crc+crypto', '-mcpu=neoverse-n1'],
> flags_n1sdp_extra]]
> + ['0xd0c', ['-march=armv8.2-a+crypto', '-mcpu=neoverse-n1'],
> +flags_n1generic_extra]]
>
> machine_args_cavium = [
> ['default', ['-march=armv8-a+crc+crypto','-mcpu=thunderx']],
> --
> 2.16.6
