From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Eric Biederman <ebiederm@xmission.com>,
Kees Cook <keescook@chromium.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
linux-arm-kernel@lists.infradead.org,
Mark Brown <broonie@kernel.org>
Subject: [PATCH v2 0/4] arm64: Add AT_HWCAP3
Date: Mon, 20 Jun 2022 13:54:47 +0100 [thread overview]
Message-ID: <20220620125451.653507-1-broonie@kernel.org> (raw)
Currently for arm64 we expose hwcaps to userspace using the low 32 bits
of AT_HWCAP and AT_HWCAP2. Due to the ever expanding capabilties of the
architecture we have now allocated all the available bits in this scheme
so we need to expand, either using the higher bits or adding a new
AT_HWCAP3. Discussions with glibc developers suggested that AT_HWCAP3
would be cleaner for them so the series adopts that approach.
The final patch adds an initial value in AT_HWCAP3 reporting the
presence of FEAT_EBF16, this will conflict with my series converting
ID_AA64ISAR1_EL1 to be generated. I've got a version based on top of
that which I can send if that's convenient.
v2:
- Rebase onto v5.19-rc3.
Mark Brown (4):
arm64/cpufeature: Store elf_hwcaps as an array rather than unsigned
long
elf: Allow architectures to provide AT_HWCAP3
arm64/cpufeature: Support AT_HWCAP3
arm64/hwcap: Support FEAT_EBF16
Documentation/arm64/elf_hwcaps.rst | 10 +++++++---
arch/arm64/include/asm/cpufeature.h | 5 ++++-
arch/arm64/include/asm/hwcap.h | 17 ++++++++++++-----
arch/arm64/include/uapi/asm/hwcap.h | 5 +++++
arch/arm64/kernel/cpufeature.c | 28 +++++++++++++++++++++-------
arch/arm64/kernel/cpuinfo.c | 1 +
fs/binfmt_elf.c | 3 +++
include/uapi/linux/auxvec.h | 1 +
8 files changed, 54 insertions(+), 16 deletions(-)
base-commit: a111daf0c53ae91e71fd2bfe7497862d14132e3e
--
2.30.2
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next reply other threads:[~2022-06-20 13:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 12:54 Mark Brown [this message]
2022-06-20 12:54 ` [PATCH v2 1/4] arm64/cpufeature: Store elf_hwcaps as an array rather than unsigned long Mark Brown
2022-06-28 14:21 ` Will Deacon
2022-06-28 15:06 ` Mark Brown
2022-06-29 10:01 ` Szabolcs Nagy
2022-06-29 11:44 ` Mark Brown
2022-06-29 12:06 ` Szabolcs Nagy
2022-06-29 13:55 ` Catalin Marinas
2022-06-29 15:07 ` Mark Brown
2022-06-20 12:54 ` [PATCH v2 2/4] elf: Allow architectures to provide AT_HWCAP3 Mark Brown
2022-06-20 12:54 ` [PATCH v2 3/4] arm64/cpufeature: Support AT_HWCAP3 Mark Brown
2022-06-20 12:54 ` [PATCH v2 4/4] arm64/hwcap: Support FEAT_EBF16 Mark Brown
2022-07-05 17:53 ` [PATCH v2 0/4] arm64: Add AT_HWCAP3 Mark Brown
2022-07-06 9:02 ` Szabolcs Nagy
2022-07-06 10:08 ` Marc Zyngier
2022-07-06 13:48 ` Mark Brown
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