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2022-09-06arm64/sysreg: Add hwcap for SVE EBF16Mark Brown1-0/+3
SVE has a separate identification register indicating support for BFloat16 operations. Add a hwcap identifying support for EBF16 in this register, mirroring what we did for the non-SVE case. While there is currently an architectural requirement for BF16 support to be the same in SVE and non-SVE contexts there are separate identification registers this separate hwcap helps avoid issues if that requirement were to be relaxed in the future, we have already chosen to have a separate capability for base BF16 support. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220829154815.832347-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2022-08-23docs/arm64: elf_hwcaps: unify newlines in HWCAP listsMartin Liška1-10/+0
Unify horizontal spacing (remove extra newlines) which are sensitive to visual presentation by Sphinx. Fixes: 5e64b862c482 ("arm64/sme: Basic enumeration support") Signed-off-by: Martin Liska <mliska@suse.cz> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/84e3d6cc-75cf-d6f3-9bb8-be02075aaf6d@suse.cz Signed-off-by: Will Deacon <will@kernel.org>
2022-08-02Merge tag 'docs-6.0' of git://git.lwn.net/linuxLinus Torvalds1-23/+0
Pull documentation updates from Jonathan Corbet: "This was a moderately busy cycle for documentation, but nothing all that earth-shaking: - More Chinese translations, and an update to the Italian translations. The Japanese, Korean, and traditional Chinese translations are more-or-less unmaintained at this point, instead. - Some build-system performance improvements. - The removal of the archaic submitting-drivers.rst document, with the movement of what useful material that remained into other docs. - Improvements to sphinx-pre-install to, hopefully, give more useful suggestions. - A number of build-warning fixes Plus the usual collection of typo fixes, updates, and more" * tag 'docs-6.0' of git://git.lwn.net/linux: (92 commits) docs: efi-stub: Fix paths for x86 / arm stubs Docs/zh_CN: Update the translation of sched-stats to 5.19-rc8 Docs/zh_CN: Update the translation of pci to 5.19-rc8 Docs/zh_CN: Update the translation of pci-iov-howto to 5.19-rc8 Docs/zh_CN: Update the translation of usage to 5.19-rc8 Docs/zh_CN: Update the translation of testing-overview to 5.19-rc8 Docs/zh_CN: Update the translation of sparse to 5.19-rc8 Docs/zh_CN: Update the translation of kasan to 5.19-rc8 Docs/zh_CN: Update the translation of iio_configfs to 5.19-rc8 doc:it_IT: align Italian documentation docs: Remove spurious tag from admin-guide/mm/overcommit-accounting.rst Documentation: process: Update email client instructions for Thunderbird docs: ABI: correct QEMU fw_cfg spec path doc/zh_CN: remove submitting-driver reference from docs docs: zh_TW: align to submitting-drivers removal docs: zh_CN: align to submitting-drivers removal docs: ko_KR: howto: remove reference to removed submitting-drivers docs: ja_JP: howto: remove reference to removed submitting-drivers docs: it_IT: align to submitting-drivers removal docs: process: remove outdated submitting-drivers.rst ...
2022-07-20arm64/hwcap: Support FEAT_EBF16Mark Brown1-0/+4
The v9.2 feature FEAT_EBF16 provides support for an extended BFloat16 mode. Allow userspace to discover system support for this feature by adding a hwcap for it. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220707103632.12745-4-broonie@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
2022-06-13docs/arm64: elf_hwcaps: Unify HWCAP lists as description listsMartin Liška1-23/+0
Add a series of blank lines to this document to get consistend rendering as an RST description list. Signed-off-by: Martin Liska <mliska@suse.cz> Link: https://lore.kernel.org/r/d0e576ab-6121-b7d7-da5b-7750f05ca7f4@suse.cz Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2022-05-04Merge branch kvm-arm64/wfxt into kvmarm-master/nextMarc Zyngier1-0/+4
* kvm-arm64/wfxt: : . : Add support for the WFET/WFIT instructions that provide the same : service as WFE/WFI, only with a timeout. : . KVM: arm64: Expose the WFXT feature to guests KVM: arm64: Offer early resume for non-blocking WFxT instructions KVM: arm64: Handle blocking WFIT instruction KVM: arm64: Introduce kvm_counter_compute_delta() helper KVM: arm64: Simplify kvm_cpu_has_pending_timer() arm64: Use WFxT for __delay() when possible arm64: Add wfet()/wfit() helpers arm64: Add HWCAP advertising FEAT_WFXT arm64: Add RV and RN fields for ESR_ELx_WFx_ISS arm64: Expand ESR_ELx_WFx_ISS_TI to match its ARMv8.7 definition Signed-off-by: Marc Zyngier <maz@kernel.org>
2022-04-22arm64/sme: Basic enumeration supportMark Brown1-0/+33
This patch introduces basic cpufeature support for discovering the presence of the Scalable Matrix Extension. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220419112247.711548-9-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2022-04-20arm64: Add HWCAP advertising FEAT_WFXTMarc Zyngier1-0/+4
In order to allow userspace to enjoy WFET, add a new HWCAP that advertises it when available. Signed-off-by: Marc Zyngier <maz@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220419182755.601427-9-maz@kernel.org
2022-02-25arm64/mte: Add hwcap for asymmetric modeMark Brown1-0/+5
Allow userspace to detect support for asymmetric mode by providing a hwcap for it, using the official feature name FEAT_MTE3. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Tested-by: Branislav Rankov <branislav.rankov@arm.com> Link: https://lore.kernel.org/r/20220216173224.2342152-4-broonie@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
2021-12-13arm64: cpufeature: add HWCAP for FEAT_RPRESJoey Gouly1-0/+4
Add a new HWCAP to detect the Increased precision of Reciprocal Estimate and Reciprocal Square Root Estimate feature (FEAT_RPRES), introduced in Armv8.7. Also expose this to userspace in the ID_AA64ISAR2_EL1 feature register. Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211210165432.8106-4-joey.gouly@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-12-13arm64: cpufeature: add HWCAP for FEAT_AFPJoey Gouly1-0/+4
Add a new HWCAP to detect the Alternate Floating-point Behaviour feature (FEAT_AFP), introduced in Armv8.7. Also expose this to userspace in the ID_AA64MMFR1_EL1 feature register. Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Will Deacon <will@kernel.org> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211210165432.8106-2-joey.gouly@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-10-19arm64: Add HWCAP for self-synchronising virtual counterMarc Zyngier1-0/+4
Since userspace can make use of the CNTVSS_EL0 instruction, expose it via a HWCAP. Suggested-by: Will Deacon <will@kernel.org> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20211017124225.3018098-18-maz@kernel.org Signed-off-by: Will Deacon <will@kernel.org>
2021-05-05arm64: Fix the documented event stream frequencyCatalin Marinas1-1/+1
It should be 10KHz, matching the ARCH_TIMER_EVT_STREAM_PERIOD_US of 100us. Note that this is only a documentation bug. Fixes: 611a7bc74ed2 ("arm64: docs: describe ELF hwcaps") Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20210505132845.23698-1-catalin.marinas@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-11-30Documentation: Chinese translation of Documentation/arm64/elf_hwcaps.rstBailu Lin1-0/+2
This is a Chinese translated version of Documentation/arm64/elf_hwcaps.rst Signed-off-by: Bailu Lin <bailu.lin@vivo.com> Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com> Link: https://lore.kernel.org/r/20201124023846.34826-1-bailu.lin@vivo.com Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2020-09-04arm64: mte: Add Memory Tagging Extension documentationVincenzo Frascino1-0/+4
Memory Tagging Extension (part of the ARMv8.5 Extensions) provides a mechanism to detect the sources of memory related errors which may be vulnerable to exploitation, including bounds violations, use-after-free, use-after-return, use-out-of-scope and use before initialization errors. Add Memory Tagging Extension documentation for the arm64 linux kernel support. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Cc: Will Deacon <will@kernel.org>
2020-03-16arm64: Basic Branch Target Identification supportDave Martin1-0/+5
This patch adds the bare minimum required to expose the ARMv8.5 Branch Target Identification feature to userspace. By itself, this does _not_ automatically enable BTI for any initial executable pages mapped by execve(). This will come later, but for now it should be possible to enable BTI manually on those pages by using mprotect() from within the target process. Other arches already using the generic mman.h are already using 0x10 for arch-specific prot flags, so we use that for PROT_BTI here. For consistency, signal handler entry points in BTI guarded pages are required to be annotated as such, just like any other function. This blocks a relatively minor attack vector, but comforming userspace will have the annotations anyway, so we may as well enforce them. Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-01-22Merge branch 'for-next/rng' into for-next/coreWill Deacon1-0/+4
* for-next/rng: (2 commits) arm64: Use v8.5-RNG entropy for KASLR seed ...
2020-01-22arm64: Implement archrandom.h for ARMv8.5-RNGRichard Henderson1-0/+4
Expose the ID_AA64ISAR0.RNDR field to userspace, as the RNG system registers are always available at EL0. Implement arch_get_random_seed_long using RNDR. Given that the TRNG is likely to be a shared resource between cores, and VMs, do not explicitly force re-seeding with RNDRRS. In order to avoid code complexity and potential issues with hetrogenous systems only provide values after cpufeature has finalized the system capabilities. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> [Modified to only function after cpufeature has finalized the system capabilities and move all the code into the header -- broonie] Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> [will: Advertise HWCAP via /proc/cpuinfo] Signed-off-by: Will Deacon <will@kernel.org>
2020-01-15arm64: cpufeature: Export matrix and other features to userspaceSteven Price1-0/+27
Export the features introduced as part of ARMv8.6 exposed in the ID_AA64ISAR1_EL1 and ID_AA64ZFR0_EL1 registers. This introduces the Matrix features (ARMv8.2-I8MM, ARMv8.2-F64MM and ARMv8.2-F32MM) along with BFloat16 (Armv8.2-BF16), speculation invalidation (SPECRES) and Data Gathering Hint (ARMv8.0-DGH). Signed-off-by: Julien Grall <julien.grall@arm.com> [Added other features in those registers] Signed-off-by: Steven Price <steven.price@arm.com> [will: Don't advertise SPECRES to userspace] Signed-off-by: Will Deacon <will@kernel.org>
2019-10-14docs/arm64: elf_hwcaps: Document HWCAP_SBJulien Grall1-0/+3
All the hardware capabilities but HWCAP_SB is not documented in elf_hwcaps.rst. So document it. Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Julien Grall <julien.grall@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-10-14docs/arm64: elf_hwcaps: sort the HWCAP{, 2} documentation by ascending valueJulien Grall1-32/+32
Part of the hardware capabilities documented in elf_hwcap.rst are ordered following the definition in the header arch/arm64/include/uapi/asm/hwcap.h but others seems to be documented in random order. To make easier to match against the definition in the header, they are now sorted in the same order as they are defined in header. I.e., HWCAP first by ascending value, and then HWCAP2 in the similar fashion. Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Julien Grall <julien.grall@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-07-09Merge tag 'docs-5.3' of git://git.lwn.net/linuxLinus Torvalds1-0/+209
Pull Documentation updates from Jonathan Corbet: "It's been a relatively busy cycle for docs: - A fair pile of RST conversions, many from Mauro. These create more than the usual number of simple but annoying merge conflicts with other trees, unfortunately. He has a lot more of these waiting on the wings that, I think, will go to you directly later on. - A new document on how to use merges and rebases in kernel repos, and one on Spectre vulnerabilities. - Various improvements to the build system, including automatic markup of function() references because some people, for reasons I will never understand, were of the opinion that :c:func:``function()`` is unattractive and not fun to type. - We now recommend using sphinx 1.7, but still support back to 1.4. - Lots of smaller improvements, warning fixes, typo fixes, etc" * tag 'docs-5.3' of git://git.lwn.net/linux: (129 commits) docs: automarkup.py: ignore exceptions when seeking for xrefs docs: Move binderfs to admin-guide Disable Sphinx SmartyPants in HTML output doc: RCU callback locks need only _bh, not necessarily _irq docs: format kernel-parameters -- as code Doc : doc-guide : Fix a typo platform: x86: get rid of a non-existent document Add the RCU docs to the core-api manual Documentation: RCU: Add TOC tree hooks Documentation: RCU: Rename txt files to rst Documentation: RCU: Convert RCU UP systems to reST Documentation: RCU: Convert RCU linked list to reST Documentation: RCU: Convert RCU basic concepts to reST docs: filesystems: Remove uneeded .rst extension on toctables scripts/sphinx-pre-install: fix out-of-tree build docs: zh_CN: submitting-drivers.rst: Remove a duplicated Documentation/ Documentation: PGP: update for newer HW devices Documentation: Add section about CPU vulnerabilities for Spectre Documentation: platform: Delete x86-laptop-drivers.txt docs: Note that :c:func: should no longer be used ...
2019-06-14docs: arm64: convert docs to ReST and rename to .rstMauro Carvalho Chehab1-0/+201
The documentation is in a format that is very close to ReST format. The conversion is actually: - add blank lines in order to identify paragraphs; - fixing tables markups; - adding some lists markups; - marking literal blocks; - adjust some title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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