c0cd1d5417
This reverts commit 44ecda71fd.
All versions of this patch on the mailing list, including the version
that ended up getting merged, have portions of code guarded by the
non-existent CONFIG_ARM64_WORKAROUND_2645198 option. Although Anshuman
says he tested the code with some additional debug changes [1], I'm
hesitant to fix the CONFIG option and light up a bunch of code right
before I (and others) disappear for the end of year holidays, during
which time we won't be around to deal with any fallout.
So revert the change for now. We can bring back a fixed, tested version
for a later -rc when folks are thinking about things other than trees
and turkeys.
[1] https://lore.kernel.org/r/b6f61241-e436-5db1-1053-3b441080b8d6@arm.com
Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20221215094811.23188-1-lukas.bulwahn@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
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ReStructuredText
=======================================
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Silicon Errata and Software Workarounds
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=======================================
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Author: Will Deacon <will.deacon@arm.com>
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Date : 27 November 2015
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It is an unfortunate fact of life that hardware is often produced with
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so-called "errata", which can cause it to deviate from the architecture
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under specific circumstances. For hardware produced by ARM, these
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errata are broadly classified into the following categories:
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========== ========================================================
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Category A A critical error without a viable workaround.
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Category B A significant or critical error with an acceptable
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workaround.
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Category C A minor error that is not expected to occur under normal
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operation.
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========== ========================================================
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For more information, consult one of the "Software Developers Errata
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Notice" documents available on infocenter.arm.com (registration
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required).
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As far as Linux is concerned, Category B errata may require some special
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treatment in the operating system. For example, avoiding a particular
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sequence of code, or configuring the processor in a particular way. A
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less common situation may require similar actions in order to declassify
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a Category A erratum into a Category C erratum. These are collectively
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known as "software workarounds" and are only required in the minority of
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cases (e.g. those cases that both require a non-secure workaround *and*
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can be triggered by Linux).
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For software workarounds that may adversely impact systems unaffected by
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the erratum in question, a Kconfig entry is added under "Kernel
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Features" -> "ARM errata workarounds via the alternatives framework".
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These are enabled by default and patched in at runtime when an affected
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CPU is detected. For less-intrusive workarounds, a Kconfig option is not
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available and the code is structured (preferably with a comment) in such
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a way that the erratum will not be hit.
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This approach can make it slightly onerous to determine exactly which
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errata are worked around in an arbitrary kernel source tree, so this
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file acts as a registry of software workarounds in the Linux Kernel and
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will be updated when new workarounds are committed and backported to
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stable kernels.
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+----------------+-----------------+-----------------+-----------------------------+
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| Implementor | Component | Erratum ID | Kconfig |
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+================+=================+=================+=============================+
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| Allwinner | A64/R18 | UNKNOWN1 | SUN50I_ERRATUM_UNKNOWN1 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2457168 | ARM64_ERRATUM_2457168 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2064142 | ARM64_ERRATUM_2064142 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2038923 | ARM64_ERRATUM_2038923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #1902691 | ARM64_ERRATUM_1902691 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #819472 | ARM64_ERRATUM_819472 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #845719 | ARM64_ERRATUM_845719 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A53 | #843419 | ARM64_ERRATUM_843419 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_1530923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A55 | #2441007 | ARM64_ERRATUM_2441007 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_832075 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #852523 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #1319537 | ARM64_ERRATUM_1319367 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A57 | #1742098 | ARM64_ERRATUM_1742098 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #853709 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #1319367 | ARM64_ERRATUM_1319367 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A72 | #1655431 | ARM64_ERRATUM_1742098 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1188873,1418040| ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1165522 | ARM64_ERRATUM_1165522 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A77 | #1508412 | ARM64_ERRATUM_1508412 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2051678 | ARM64_ERRATUM_2051678 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2077057 | ARM64_ERRATUM_2077057 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2441009 | ARM64_ERRATUM_2441009 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A510 | #2658417 | ARM64_ERRATUM_2658417 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-A710 | #2224489 | ARM64_ERRATUM_2224489 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X2 | #2119858 | ARM64_ERRATUM_2119858 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Cortex-X2 | #2224489 | ARM64_ERRATUM_2224489 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1349291 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N1 | #1542419 | ARM64_ERRATUM_1542419 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2139208 | ARM64_ERRATUM_2139208 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2067961 | ARM64_ERRATUM_2067961 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | Neoverse-N2 | #2253138 | ARM64_ERRATUM_2253138 |
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+----------------+-----------------+-----------------+-----------------------------+
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| ARM | MMU-500 | #841119,826419 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_843419 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX GICv3 | #23154,38545 | CAVIUM_ERRATUM_23154 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX GICv3 | #38539 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX Core | #30115 | CAVIUM_ERRATUM_30115 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX SMMUv2 | #27704 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 SMMUv3| #74 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 SMMUv3| #126 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Cavium | ThunderX2 Core | #219 | CAVIUM_TX2_ERRATUM_219 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Marvell | ARM-MMU-500 | #582743 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| NVIDIA | Carmel Core | N/A | NVIDIA_CARMEL_CNP_ERRATUM |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{5,6,7} | #161010101 | HISILICON_ERRATUM_161010101 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{6,7} | #161010701 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip0{6,7} | #161010803 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip07 | #161600802 | HISILICON_ERRATUM_161600802 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Hisilicon | Hip08 SMMU PMCG | #162001800 | N/A |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo/Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo/Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | QDF2400 ITS | E0065 | QCOM_QDF2400_ERRATUM_0065 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Falkor v{1,2} | E1041 | QCOM_FALKOR_ERRATUM_1041 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1463225 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1418040 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1530923 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1024718 |
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+----------------+-----------------+-----------------+-----------------------------+
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1286807 |
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+----------------+-----------------+-----------------+-----------------------------+
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+----------------+-----------------+-----------------+-----------------------------+
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| Fujitsu | A64FX | E#010001 | FUJITSU_ERRATUM_010001 |
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+----------------+-----------------+-----------------+-----------------------------+
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