diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2019-04-09 18:22:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-29 11:22:37 +0300 |
| commit | 351a0572d40fec408cbae34f02246c68e206ce55 (patch) | |
| tree | 3be1d99cf57fb20d52745b9a8d75a1d829e1a395 /arch | |
| parent | adae972de033d8f93c75303c2df1e225375f7cfd (diff) | |
| download | linux-351a0572d40fec408cbae34f02246c68e206ce55.tar.xz | |
arm64: Avoid Cavium TX2 erratum 219 when switching TTBR
commit 9405447ef79bc93101373e130f72e9e6cbf17dbb upstream.
As a PRFM instruction racing against a TTBR update can have undesirable
effects on TX2, NOP-out such PRFM on cores that are affected by
the TX2-219 erratum.
Cc: <stable@vger.kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 5 | ||||
| -rw-r--r-- | arch/arm64/kernel/entry.S | 2 |
3 files changed, 9 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index e81e0cbd728f..ac1dbca3d0cd 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -53,7 +53,8 @@ #define ARM64_HAS_DCPODP 43 #define ARM64_WORKAROUND_1463225 44 #define ARM64_WORKAROUND_CAVIUM_TX2_219_TVM 45 +#define ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM 46 -#define ARM64_NCAPS 46 +#define ARM64_NCAPS 47 #endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 1e43ba5c79b7..a86b75782a35 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -851,6 +851,11 @@ const struct arm64_cpu_capabilities arm64_errata[] = { .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM, .matches = has_cortex_a76_erratum_1463225, }, + { + .desc = "Cavium ThunderX2 erratum 219 (PRFM removal)", + .capability = ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM, + ERRATA_MIDR_RANGE_LIST(tx2_family_cpus), + }, #endif { } diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 84a822748c84..109894bd3194 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -1070,7 +1070,9 @@ alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003 #else ldr x30, =vectors #endif +alternative_if_not ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM prfm plil1strm, [x30, #(1b - tramp_vectors)] +alternative_else_nop_endif msr vbar_el1, x30 add x30, x30, #(1b - tramp_vectors) isb |