Merge tag 'dax-fixes-4.20-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...

[linux-2.6-block.git] / arch / arm64 / Kconfig

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 787d7850e0643d80197e29bcfbfedf6d40ab46eb..ea2ab0330e3a14f67deabada3b8903cca6fcea3b 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -497,6 +497,24 @@ config ARM64_ERRATUM_1188873
 
          If unsure, say Y.
 
+config ARM64_ERRATUM_1286807
+       bool "Cortex-A76: Modification of the translation table for a virtual address might lead to read-after-read ordering violation"
+       default y
+       select ARM64_WORKAROUND_REPEAT_TLBI
+       help
+         This option adds workaround for ARM Cortex-A76 erratum 1286807
+
+         On the affected Cortex-A76 cores (r0p0 to r3p0), if a virtual
+         address for a cacheable mapping of a location is being
+         accessed by a core while another core is remapping the virtual
+         address to a new physical page using the recommended
+         break-before-make sequence, then under very rare circumstances
+         TLBI+DSB completes before a read using the translation being
+         invalidated has been observed by other observers. The
+         workaround repeats the TLBI+DSB operation.
+
+         If unsure, say Y.
+
 config CAVIUM_ERRATUM_22375
        bool "Cavium erratum 22375, 24313"
        default y
@@ -566,9 +584,16 @@ config QCOM_FALKOR_ERRATUM_1003
          is unchanged. Work around the erratum by invalidating the walk cache
          entries for the trampoline before entering the kernel proper.
 
+config ARM64_WORKAROUND_REPEAT_TLBI
+       bool
+       help
+         Enable the repeat TLBI workaround for Falkor erratum 1009 and
+         Cortex-A76 erratum 1286807.
+
 config QCOM_FALKOR_ERRATUM_1009
        bool "Falkor E1009: Prematurely complete a DSB after a TLBI"
        default y
+       select ARM64_WORKAROUND_REPEAT_TLBI
        help
          On Falkor v1, the CPU may prematurely complete a DSB following a
          TLBI xxIS invalidate maintenance operation. Repeat the TLBI operation