Re: [RFC PATCH 00/25] Upstream kvx Linux port

Rob Herring
2023-01-03T20:53:08Z

On Tue, Jan 03, 2023 at 05:43:34PM +0100, Yann Sionneau wrote:
> This patch series adds support for the kv3-1 CPU architecture of the kvx family
> found in the Coolidge (aka MPPA3-80) SoC of Kalray.
>
> This is an RFC, since kvx support is not yet upstreamed into gcc/binutils,
> therefore this patch series cannot be merged into Linux for now.
>
> The goal is to have preliminary reviews and to fix problems early.
>
> The Kalray VLIW processor family (kvx) has the following features:
> * 32/64 bits execution mode
> * 6-issue VLIW architecture
> * 64 x 64bits general purpose registers
> * SIMD instructions
> * little-endian
> * deep learning co-processor
>
> Kalray kv3-1 core which is the third of the kvx family is embedded in Kalray
> Coolidge SoC currently used on K200 and K200-LP boards.
>
> The Coolidge SoC contains 5 clusters each of which is made of:
> * 4MiB of on-chip memory (SMEM)
> * 1 dedicated safety/security core (kv3-1 core).
> * 16 PEs (Processing Elements) (kv3-1 cores).
> * 16 Co-processors (one per PE)
> * 2 Crypto accelerators
>
> The Coolidge SoC contains the following features:
> * 5 Clusters
> * 2 100G Ethernet controllers
> * 8 PCIe GEN4 controllers (Root Complex and Endpoint capable)
> * 2 USB 2.0 controllers
> * 1 Octal SPI-NOR flash controller
> * 1 eMMC controller
> * 3 Quad SPI controllers
> * 6 UART
> * 5 I2C controllers (3 of which are SMBus capable)
> * 4 CAN controllers
> * 1 OTP memory
>
> A kvx toolchain can be built using:
> # install dependencies: texinfo bison flex libgmp-dev libmpc-dev libmpfr-dev
> $ git clone https://github.com/kalray/build-scripts
> $ cd build-scripts
> $ source last.refs
> $ ./build-kvx-xgcc.sh output
>
> The kvx toolchain will be installed in the "output" directory.
>
> A buildroot image (kernel+rootfs) and toolchain can be built using:
> $ git clone -b coolidge-for-upstream https://github.com/kalray/buildroot
> $ cd buildroot
> $ make O=build_kvx kvx_defconfig
> $ make O=build_kvx
>
> The vmlinux image can be found in buildroot/build_kvx/images/vmlinux.
>
> If you are just interested in building the Linux kernel with no rootfs you can
> just do this with the kvx-elf- toolchain:
> $ make ARCH=kvx O=build_kvx CROSS_COMPILE=kvx-elf- default_defconfig
> $ make ARCH=kvx O=build_kvx CROSS_COMPILE=kvx-elf- -j$(($(nproc) + 1))
>
> The vmlinux ELF can be run with qemu by doing:
> # install dependencies: ninja pkg-config libglib-2.0-dev cmake libfdt-dev libpixman-1-dev zlib1g-dev
> $ git clone https://github.com/kalray/qemu-builder
> $ cd qemu-builder
> $ git submodule update --init
> $ make -j$(($(nproc) + 1))
> $ ./qemu-system-kvx -m 1024 -nographic -kernel <path/to/vmlinux>
>
> Yann Sionneau (25):
> Documentation: kvx: Add basic documentation
> kvx: Add ELF-related definitions
> kvx: Add build infrastructure
> kvx: Add CPU definition headers
> kvx: Add atomic/locking headers
> kvx: Add other common headers
> kvx: Add boot and setup routines
> kvx: Add exception/interrupt handling
> kvx: irqchip: Add support for irq controllers
> kvx: Add process management
> kvx: Add memory management
> kvx: Add system call support
> kvx: Add signal handling support
> kvx: Add ELF relocations and module support
> kvx: Add misc common routines
> kvx: Add some library functions
> kvx: Add multi-processor (SMP) support
> kvx: Add kvx default config file
> kvx: power: scall poweroff driver
> kvx: gdb: add kvx related gdb helpers
> kvx: Add support for ftrace
> kvx: Add support for jump labels
> kvx: Add debugging related support
> kvx: Add support for CPU Perf Monitors
> kvx: Add support for cpuinfo

You should strip this series down to just what's needed to boot. You
don't need the last 7 patches at least.

Rob