From: Dave.Martin@arm.com (Dave Martin)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 00/29] arm64: Scalable Vector Extension core support
Date: Fri, 25 Nov 2016 19:38:48 +0000 [thread overview]
Message-ID: <1480102762-23647-1-git-send-email-Dave.Martin@arm.com> (raw)
The Scalable Vector Extension (SVE) [1] is an extension to AArch64 which
adds extra SIMD functionality and supports much larger vectors.
This series implements core Linux support for SVE.
Recipents not copied on the whole series can find the rest of the
patches in the linux-arm-kernel archives [2].
The first 5 patches "arm64: signal: ..." factor out the allocation and
placement of state information in the signal frame. The first three
are prerequisites for the SVE support patches.
Patches 04-05 implement expansion of the signal frame, and may remain
controversial due to ABI break issues:
* Discussion is needed on how userspace should detect/negotiate signal
frame size in order for this expansion mechanism to be workable.
The remaining patches implement initial SVE support for Linux, with the
following limitations:
* No KVM/virtualisation support for guests.
* No independent SVE vector length configuration per thread. This is
planned, but will follow as a separate add-on series.
* As a temporary workaround for the signal frame size issue, vector
length is software-limited to 512 bits (see patch 29), with a
build-time kernel configuration option to relax this.
Discussion is needed on how to smooth address the signal ABI issues
so that this workaround can be removed.
* A fair number of development BUG_ON()s are still present, which
will be demoted or removed for merge.
* There is a context-switch race condition lurking somewhere which
fires in certain situations with my development KVM hacks (not part
of this posting) -- the underlying bug might or might not be in this
series.
Review and comments welcome.
Cheers
---Dave
[1] https://community.arm.com/groups/processors/blog/2016/08/22/technology-update-the-scalable-vector-extension-sve-for-the-armv8-a-architecture
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-November/thread.html
Alan Hayward (1):
arm64/sve: ptrace support
Dave Martin (28):
arm64: signal: Refactor sigcontext parsing in rt_sigreturn
arm64: signal: factor frame layout and population into separate passes
arm64: signal: factor out signal frame record allocation
arm64: signal: Allocate extra sigcontext space as needed
arm64: signal: Parse extra_context during sigreturn
arm64: efi: Add missing Kconfig dependency on KERNEL_MODE_NEON
arm64/sve: Allow kernel-mode NEON to be disabled in Kconfig
arm64/sve: Low-level save/restore code
arm64/sve: Boot-time feature detection and reporting
arm64/sve: Boot-time feature enablement
arm64/sve: Expand task_struct for Scalable Vector Extension state
arm64/sve: Save/restore SVE state on context switch paths
arm64/sve: Basic support for KERNEL_MODE_NEON
Revert "arm64/sve: Allow kernel-mode NEON to be disabled in Kconfig"
arm64/sve: Restore working FPSIMD save/restore around signals
arm64/sve: signal: Add SVE state record to sigcontext
arm64/sve: signal: Dump Scalable Vector Extension registers to user
stack
arm64/sve: signal: Restore FPSIMD/SVE state in rt_sigreturn
arm64/sve: Avoid corruption when replacing the SVE state
arm64/sve: traps: Add descriptive string for SVE exceptions
arm64/sve: Enable SVE on demand for userspace
arm64/sve: Implement FPSIMD-only context for tasks not using SVE
arm64/sve: Move ZEN handling to the common task_fpsimd_load() path
arm64/sve: Discard SVE state on system call
arm64/sve: Avoid preempt_disable() during sigreturn
arm64/sve: Avoid stale user register state after SVE access exception
arm64: KVM: Treat SVE use by guests as undefined instruction execution
arm64/sve: Limit vector length to 512 bits by default
arch/arm64/Kconfig | 48 +++
arch/arm64/include/asm/esr.h | 3 +-
arch/arm64/include/asm/fpsimd.h | 37 +++
arch/arm64/include/asm/fpsimdmacros.h | 145 +++++++++
arch/arm64/include/asm/kvm_arm.h | 1 +
arch/arm64/include/asm/sysreg.h | 11 +
arch/arm64/include/asm/thread_info.h | 2 +
arch/arm64/include/uapi/asm/hwcap.h | 1 +
arch/arm64/include/uapi/asm/ptrace.h | 125 ++++++++
arch/arm64/include/uapi/asm/sigcontext.h | 117 ++++++++
arch/arm64/kernel/cpufeature.c | 3 +
arch/arm64/kernel/cpuinfo.c | 1 +
arch/arm64/kernel/entry-fpsimd.S | 17 ++
arch/arm64/kernel/entry.S | 18 +-
arch/arm64/kernel/fpsimd.c | 301 ++++++++++++++++++-
arch/arm64/kernel/head.S | 16 +-
arch/arm64/kernel/process.c | 2 +-
arch/arm64/kernel/ptrace.c | 254 +++++++++++++++-
arch/arm64/kernel/setup.c | 3 +
arch/arm64/kernel/signal.c | 497 +++++++++++++++++++++++++++++--
arch/arm64/kernel/signal32.c | 2 +-
arch/arm64/kernel/traps.c | 1 +
arch/arm64/kvm/handle_exit.c | 9 +
arch/arm64/mm/proc.S | 27 +-
include/uapi/linux/elf.h | 1 +
25 files changed, 1583 insertions(+), 59 deletions(-)
--
2.1.4
next reply other threads:[~2016-11-25 19:38 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-25 19:38 Dave Martin [this message]
2016-11-25 19:38 ` [RFC PATCH 01/29] arm64: signal: Refactor sigcontext parsing in rt_sigreturn Dave Martin
2016-11-25 19:38 ` [RFC PATCH 02/29] arm64: signal: factor frame layout and population into separate passes Dave Martin
2016-11-25 19:38 ` [RFC PATCH 03/29] arm64: signal: factor out signal frame record allocation Dave Martin
2016-11-25 19:38 ` [RFC PATCH 04/29] arm64: signal: Allocate extra sigcontext space as needed Dave Martin
2016-11-25 19:38 ` [RFC PATCH 05/29] arm64: signal: Parse extra_context during sigreturn Dave Martin
2016-11-25 19:38 ` [RFC PATCH 06/29] arm64: efi: Add missing Kconfig dependency on KERNEL_MODE_NEON Dave Martin
2016-11-25 20:25 ` Ard Biesheuvel
2016-11-25 19:38 ` [RFC PATCH 07/29] arm64/sve: Allow kernel-mode NEON to be disabled in Kconfig Dave Martin
2016-11-25 19:38 ` [RFC PATCH 08/29] arm64/sve: Low-level save/restore code Dave Martin
2016-11-25 19:38 ` [RFC PATCH 09/29] arm64/sve: Boot-time feature detection and reporting Dave Martin
2016-11-25 19:38 ` [RFC PATCH 10/29] arm64/sve: Boot-time feature enablement Dave Martin
2016-11-25 19:38 ` [RFC PATCH 11/29] arm64/sve: Expand task_struct for Scalable Vector Extension state Dave Martin
2016-11-25 19:39 ` [RFC PATCH 12/29] arm64/sve: Save/restore SVE state on context switch paths Dave Martin
2016-11-25 19:39 ` [RFC PATCH 13/29] arm64/sve: Basic support for KERNEL_MODE_NEON Dave Martin
2016-11-25 20:45 ` Ard Biesheuvel
2016-11-26 11:30 ` Catalin Marinas
2016-11-28 11:47 ` Dave Martin
2016-11-28 12:06 ` Catalin Marinas
2016-11-28 12:29 ` Dave Martin
2016-12-06 15:36 ` Ard Biesheuvel
2016-11-25 19:39 ` [RFC PATCH 14/29] Revert "arm64/sve: Allow kernel-mode NEON to be disabled in Kconfig" Dave Martin
2016-11-25 19:39 ` [RFC PATCH 15/29] arm64/sve: Restore working FPSIMD save/restore around signals Dave Martin
2016-11-25 19:39 ` [RFC PATCH 16/29] arm64/sve: signal: Add SVE state record to sigcontext Dave Martin
2016-11-25 19:39 ` [RFC PATCH 17/29] arm64/sve: signal: Dump Scalable Vector Extension registers to user stack Dave Martin
2016-11-25 19:39 ` [RFC PATCH 18/29] arm64/sve: signal: Restore FPSIMD/SVE state in rt_sigreturn Dave Martin
2016-11-25 19:39 ` [RFC PATCH 19/29] arm64/sve: Avoid corruption when replacing the SVE state Dave Martin
2016-11-25 19:39 ` [RFC PATCH 20/29] arm64/sve: traps: Add descriptive string for SVE exceptions Dave Martin
2016-11-25 19:39 ` [RFC PATCH 21/29] arm64/sve: Enable SVE on demand for userspace Dave Martin
2016-11-25 19:39 ` [RFC PATCH 22/29] arm64/sve: Implement FPSIMD-only context for tasks not using SVE Dave Martin
2016-11-25 19:39 ` [RFC PATCH 23/29] arm64/sve: Move ZEN handling to the common task_fpsimd_load() path Dave Martin
2016-11-25 19:39 ` [RFC PATCH 24/29] arm64/sve: Discard SVE state on system call Dave Martin
2016-11-25 19:39 ` [RFC PATCH 25/29] arm64/sve: Avoid preempt_disable() during sigreturn Dave Martin
2016-11-25 19:39 ` [RFC PATCH 26/29] arm64/sve: Avoid stale user register state after SVE access exception Dave Martin
2016-11-25 19:39 ` [RFC PATCH 27/29] arm64/sve: ptrace support Dave Martin
2016-11-25 19:39 ` [RFC PATCH 28/29] arm64: KVM: Treat SVE use by guests as undefined instruction execution Dave Martin
2016-11-25 19:39 ` [RFC PATCH 29/29] arm64/sve: Limit vector length to 512 bits by default Dave Martin
2016-11-30 9:56 ` [RFC PATCH 00/29] arm64: Scalable Vector Extension core support Yao Qi
2016-11-30 12:06 ` Dave Martin
2016-11-30 12:22 ` Szabolcs Nagy
2016-11-30 14:10 ` Dave Martin
2016-11-30 12:38 ` Florian Weimer
2016-11-30 13:56 ` Dave Martin
2016-12-01 9:21 ` Florian Weimer
2016-12-01 10:30 ` Dave Martin
2016-12-01 12:19 ` Dave Martin
2016-12-05 10:44 ` Florian Weimer
2016-12-05 11:07 ` Szabolcs Nagy
2016-12-05 15:04 ` Dave Martin
2016-12-02 11:48 ` Dave Martin
2016-12-02 16:34 ` Florian Weimer
2016-12-02 16:59 ` Joseph Myers
2016-12-02 18:21 ` Dave Martin
2016-12-02 21:56 ` Joseph Myers
2016-12-02 21:56 ` Yao Qi
2016-12-05 15:12 ` Dave Martin
2016-12-05 22:42 ` Torvald Riegel
2016-12-06 14:46 ` Dave Martin
2016-11-30 10:08 ` Florian Weimer
2016-11-30 11:05 ` Szabolcs Nagy
2016-11-30 14:06 ` Dave Martin
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