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diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst new file mode 100644 index 000000000000..c792774be59e --- /dev/null +++ b/Documentation/arm64/silicon-errata.rst @@ -0,0 +1,131 @@ +======================================= +Silicon Errata and Software Workarounds +======================================= + +Author: Will Deacon <will.deacon@arm.com> + +Date : 27 November 2015 + +It is an unfortunate fact of life that hardware is often produced with +so-called "errata", which can cause it to deviate from the architecture +under specific circumstances. For hardware produced by ARM, these +errata are broadly classified into the following categories: + + ========== ======================================================== + Category A A critical error without a viable workaround. + Category B A significant or critical error with an acceptable + workaround. + Category C A minor error that is not expected to occur under normal + operation. + ========== ======================================================== + +For more information, consult one of the "Software Developers Errata +Notice" documents available on infocenter.arm.com (registration +required). + +As far as Linux is concerned, Category B errata may require some special +treatment in the operating system. For example, avoiding a particular +sequence of code, or configuring the processor in a particular way. A +less common situation may require similar actions in order to declassify +a Category A erratum into a Category C erratum. These are collectively +known as "software workarounds" and are only required in the minority of +cases (e.g. those cases that both require a non-secure workaround *and* +can be triggered by Linux). + +For software workarounds that may adversely impact systems unaffected by +the erratum in question, a Kconfig entry is added under "Kernel +Features" -> "ARM errata workarounds via the alternatives framework". +These are enabled by default and patched in at runtime when an affected +CPU is detected. For less-intrusive workarounds, a Kconfig option is not +available and the code is structured (preferably with a comment) in such +a way that the erratum will not be hit. + +This approach can make it slightly onerous to determine exactly which +errata are worked around in an arbitrary kernel source tree, so this +file acts as a registry of software workarounds in the Linux Kernel and +will be updated when new workarounds are committed and backported to +stable kernels. + ++----------------+-----------------+-----------------+-----------------------------+ +| Implementor | Component | Erratum ID | Kconfig | ++================+=================+=================+=============================+ +| Allwinner | A64/R18 | UNKNOWN1 | SUN50I_ERRATUM_UNKNOWN1 | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #819472 | ARM64_ERRATUM_819472 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #845719 | ARM64_ERRATUM_845719 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A53 | #843419 | ARM64_ERRATUM_843419 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_832075 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A57 | #852523 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A72 | #853709 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A76 | #1188873,1418040| ARM64_ERRATUM_1418040 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A76 | #1165522 | ARM64_ERRATUM_1165522 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 | ++----------------+-----------------+-----------------+-----------------------------+ +| ARM | MMU-500 | #841119,826419 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX Core | #30115 | CAVIUM_ERRATUM_30115 | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX SMMUv2 | #27704 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX2 SMMUv3| #74 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +| Cavium | ThunderX2 SMMUv3| #126 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| Hisilicon | Hip0{5,6,7} | #161010101 | HISILICON_ERRATUM_161010101 | ++----------------+-----------------+-----------------+-----------------------------+ +| Hisilicon | Hip0{6,7} | #161010701 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ +| Hisilicon | Hip07 | #161600802 | HISILICON_ERRATUM_161600802 | ++----------------+-----------------+-----------------+-----------------------------+ +| Hisilicon | Hip08 SMMU PMCG | #162001800 | N/A | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| Qualcomm Tech. | Kryo/Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 | ++----------------+-----------------+-----------------+-----------------------------+ +| Qualcomm Tech. | Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 | ++----------------+-----------------+-----------------+-----------------------------+ +| Qualcomm Tech. | QDF2400 ITS | E0065 | QCOM_QDF2400_ERRATUM_0065 | ++----------------+-----------------+-----------------+-----------------------------+ +| Qualcomm Tech. | Falkor v{1,2} | E1041 | QCOM_FALKOR_ERRATUM_1041 | ++----------------+-----------------+-----------------+-----------------------------+ ++----------------+-----------------+-----------------+-----------------------------+ +| Fujitsu | A64FX | E#010001 | FUJITSU_ERRATUM_010001 | ++----------------+-----------------+-----------------+-----------------------------+ |