On Mon, Sep 30, 2024 at 12:07:23AM +0800, Aoba K wrote: > > On 2024/9/12 13:55, Charlie Jenkins wrote: > > xtheadvector is a custom extension that is based upon riscv vector > > version 0.7.1 [1]. All of the vector routines have been modified to > > support this alternative vector version based upon whether xtheadvector > > was determined to be supported at boot. > > > > vlenb is not supported on the existing xtheadvector hardware, so a > > devicetree property thead,vlenb is added to provide the vlenb to Linux. > > > > There is a new hwprobe key RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 that is > > used to request which thead vendor extensions are supported on the > > current platform. This allows future vendors to allocate hwprobe keys > > for their vendor. > > > > Support for xtheadvector is also added to the vector kselftests. > > > > Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> > > > > [1] https://github.com/T-head-Semi/thead-extension-spec/blob/95358cb2cca9489361c61d335e03d3134b14133f/xtheadvector.adoc > > > > --- > > This series is a continuation of a different series that was fragmented > > into two other series in an attempt to get part of it merged in the 6.10 > > merge window. The split-off series did not get merged due to a NAK on > > the series that added the generic riscv,vlenb devicetree entry. This > > series has converted riscv,vlenb to thead,vlenb to remedy this issue. > > > > The original series is titled "riscv: Support vendor extensions and > > xtheadvector" [3]. > > > > The series titled "riscv: Extend cpufeature.c to detect vendor > > extensions" is still under development and this series is based on that > > series! [4] > > > > I have tested this with an Allwinner Nezha board. I used SkiffOS [1] to > > manage building the image, but upgraded the U-Boot version to Samuel > > Holland's more up-to-date version [2] and changed out the device tree > > used by U-Boot with the device trees that are present in upstream linux > > and this series. Thank you Samuel for all of the work you did to make > > this task possible. > > > > [1] https://github.com/skiffos/SkiffOS/tree/master/configs/allwinner/nezha > > [2] https://github.com/smaeul/u-boot/commit/2e89b706f5c956a70c989cd31665f1429e9a0b48 > > [3] https://lore.kernel.org/all/20240503-dev-charlie-support_thead_vector_6_9-v6-0-cb7624e65d82@xxxxxxxxxxxx/ > > [4] https://lore.kernel.org/lkml/20240719-support_vendor_extensions-v3-4-0af7587bbec0@xxxxxxxxxxxx/T/ > > > > --- > > Changes in v10: > > - In DT probing disable vector with new function to clear vendor > > extension bits for xtheadvector > > - Add ghostwrite mitigations for c9xx CPUs. This disables xtheadvector > > unless mitigations=off is set as a kernel boot arg > > - Link to v9: https://lore.kernel.org/r/20240806-xtheadvector-v9-0-62a56d2da5d0@xxxxxxxxxxxx > > > > Changes in v9: > > - Rebase onto palmer's for-next > > - Fix sparse error in arch/riscv/kernel/vendor_extensions/thead.c > > - Fix maybe-uninitialized warning in arch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h > > - Wrap some long lines > > - Link to v8: https://lore.kernel.org/r/20240724-xtheadvector-v8-0-cf043168e137@xxxxxxxxxxxx > > > > Changes in v8: > > - Rebase onto palmer's for-next > > - Link to v7: https://lore.kernel.org/r/20240724-xtheadvector-v7-0-b741910ada3e@xxxxxxxxxxxx > > > > Changes in v7: > > - Add defs for has_xtheadvector_no_alternatives() and has_xtheadvector() > > when vector disabled. (Palmer) > > - Link to v6: https://lore.kernel.org/r/20240722-xtheadvector-v6-0-c9af0130fa00@xxxxxxxxxxxx > > > > Changes in v6: > > - Fix return type of is_vector_supported()/is_xthead_supported() to be bool > > - Link to v5: https://lore.kernel.org/r/20240719-xtheadvector-v5-0-4b485fc7d55f@xxxxxxxxxxxx > > > > Changes in v5: > > - Rebase on for-next > > - Link to v4: https://lore.kernel.org/r/20240702-xtheadvector-v4-0-2bad6820db11@xxxxxxxxxxxx > > > > Changes in v4: > > - Replace inline asm with C (Samuel) > > - Rename VCSRs to CSRs (Samuel) > > - Replace .insn directives with .4byte directives > > - Link to v3: https://lore.kernel.org/r/20240619-xtheadvector-v3-0-bff39eb9668e@xxxxxxxxxxxx > > > > Changes in v3: > > - Add back Heiko's signed-off-by (Conor) > > - Mark RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 as a bitmask > > - Link to v2: https://lore.kernel.org/r/20240610-xtheadvector-v2-0-97a48613ad64@xxxxxxxxxxxx > > > > Changes in v2: > > - Removed extraneous references to "riscv,vlenb" (Jess) > > - Moved declaration of "thead,vlenb" into cpus.yaml and added > > restriction that it's only applicable to thead cores (Conor) > > - Check CONFIG_RISCV_ISA_XTHEADVECTOR instead of CONFIG_RISCV_ISA_V for > > thead,vlenb (Jess) > > - Fix naming of hwprobe variables (Evan) > > - Link to v1: https://lore.kernel.org/r/20240609-xtheadvector-v1-0-3fe591d7f109@xxxxxxxxxxxx > > > > --- > > Charlie Jenkins (13): > > dt-bindings: riscv: Add xtheadvector ISA extension description > > dt-bindings: cpus: add a thead vlen register length property > > riscv: dts: allwinner: Add xtheadvector to the D1/D1s devicetree > > riscv: Add thead and xtheadvector as a vendor extension > > riscv: vector: Use vlenb from DT for thead > > riscv: csr: Add CSR encodings for CSR_VXRM/CSR_VXSAT > > riscv: Add xtheadvector instruction definitions > > riscv: vector: Support xtheadvector save/restore > > riscv: hwprobe: Add thead vendor extension probing > > riscv: hwprobe: Document thead vendor extensions and xtheadvector extension > > selftests: riscv: Fix vector tests > > selftests: riscv: Support xtheadvector in vector tests > > riscv: Add ghostwrite vulnerability > > > > Heiko Stuebner (1): > > RISC-V: define the elements of the VCSR vector CSR > > > > Documentation/arch/riscv/hwprobe.rst | 10 + > > Documentation/devicetree/bindings/riscv/cpus.yaml | 19 ++ > > .../devicetree/bindings/riscv/extensions.yaml | 10 + > > arch/riscv/Kconfig.errata | 11 + > > arch/riscv/Kconfig.vendor | 26 ++ > > arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 3 +- > > arch/riscv/errata/thead/errata.c | 28 ++ > > arch/riscv/include/asm/bugs.h | 22 ++ > > arch/riscv/include/asm/cpufeature.h | 2 + > > arch/riscv/include/asm/csr.h | 15 + > > arch/riscv/include/asm/errata_list.h | 3 +- > > arch/riscv/include/asm/hwprobe.h | 3 +- > > arch/riscv/include/asm/switch_to.h | 2 +- > > arch/riscv/include/asm/vector.h | 225 +++++++++++---- > > arch/riscv/include/asm/vendor_extensions/thead.h | 48 ++++ > > .../include/asm/vendor_extensions/thead_hwprobe.h | 19 ++ > > .../include/asm/vendor_extensions/vendor_hwprobe.h | 37 +++ > > arch/riscv/include/uapi/asm/hwprobe.h | 3 +- > > arch/riscv/include/uapi/asm/vendor/thead.h | 3 + > > arch/riscv/kernel/Makefile | 2 + > > arch/riscv/kernel/bugs.c | 55 ++++ > > arch/riscv/kernel/cpufeature.c | 58 +++- > > arch/riscv/kernel/kernel_mode_vector.c | 8 +- > > arch/riscv/kernel/process.c | 4 +- > > arch/riscv/kernel/signal.c | 6 +- > > arch/riscv/kernel/sys_hwprobe.c | 5 + > > arch/riscv/kernel/vector.c | 24 +- > > arch/riscv/kernel/vendor_extensions.c | 10 + > > arch/riscv/kernel/vendor_extensions/Makefile | 2 + > > arch/riscv/kernel/vendor_extensions/thead.c | 29 ++ > > .../riscv/kernel/vendor_extensions/thead_hwprobe.c | 19 ++ > > drivers/base/cpu.c | 3 + > > include/linux/cpu.h | 1 + > > tools/testing/selftests/riscv/vector/.gitignore | 3 +- > > tools/testing/selftests/riscv/vector/Makefile | 17 +- > > .../selftests/riscv/vector/v_exec_initval_nolibc.c | 94 +++++++ > > tools/testing/selftests/riscv/vector/v_helpers.c | 68 +++++ > > tools/testing/selftests/riscv/vector/v_helpers.h | 8 + > > tools/testing/selftests/riscv/vector/v_initval.c | 22 ++ > > .../selftests/riscv/vector/v_initval_nolibc.c | 68 ----- > > .../selftests/riscv/vector/vstate_exec_nolibc.c | 20 +- > > .../testing/selftests/riscv/vector/vstate_prctl.c | 305 +++++++++++++-------- > > 42 files changed, 1048 insertions(+), 272 deletions(-) > > --- > > base-commit: 0e3f3649d44bf1b388a7613ade14c29cbdedf075 > > change-id: 20240530-xtheadvector-833d3d17b423 > > > Hello Charlie, > > > Apologize for the last email, when dealing with pastebin it deleted the last > version... > > tl,dr for the last email: Patches not boot on Sipeed Lichee RV Dock (with > same D1 SoC). > > Logs here: > > https://fars.ee/XFzR > > (the board resets without kernel panic) Apologies, this thread slipped by me. This looks to be the same issue as was experienced here [1] and fixed here [2]. [1] https://lore.kernel.org/linux-riscv/ZoydV7vad5JWIcZb@ghost/ [2] https://lore.kernel.org/linux-riscv/20240820034850.3189912-1-apatel@xxxxxxxxxxxxxxxx/ Since you are on 6.11-rc2 that patch is probably not in your tree, as it was merged in 6.11-rc4 unfortunately. Can you try updating your kernel to include that patch? - Charlie > > > Cheers, > > Aoba K
