[PATCH] arm64: Enable workaround for Cavium erratum 27456 on thunderx-81xx

[Ganapatrao Kulkarni]

Cavium erratum 27456 commit 104a0c02e8b1
("arm64: Add workaround for Cavium erratum 27456")
is applicable for thunderx-81xx pass1.0 SoC as well.
Adding code to enable to 81xx.

Signed-off-by: Ganapatrao Kulkarni <gkulka...@cavium.com>
Reviewed-by: Andrew Pinski <apin...@cavium.com>
---
 arch/arm64/include/asm/cputype.h | 2 ++
 arch/arm64/kernel/cpu_errata.c   | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 87e1985..9d9fd4b 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -80,12 +80,14 @@
 #define APM_CPU_PART_POTENZA           0x000
 
 #define CAVIUM_CPU_PART_THUNDERX       0x0A1
+#define CAVIUM_CPU_PART_THUNDERX_81XX  0x0A2
 
 #define BRCM_CPU_PART_VULCAN           0x516
 
 #define MIDR_CORTEX_A53 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, 
ARM_CPU_PART_CORTEX_A53)
 #define MIDR_CORTEX_A57 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, 
ARM_CPU_PART_CORTEX_A57)
 #define MIDR_THUNDERX  MIDR_CPU_MODEL(ARM_CPU_IMP_CAVIUM, 
CAVIUM_CPU_PART_THUNDERX)
+#define MIDR_THUNDERX_81XX MIDR_CPU_MODEL(ARM_CPU_IMP_CAVIUM, 
CAVIUM_CPU_PART_THUNDERX_81XX)
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index d427894..af716b6 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -98,6 +98,12 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
                MIDR_RANGE(MIDR_THUNDERX, 0x00,
                           (1 << MIDR_VARIANT_SHIFT) | 1),
        },
+       {
+       /* Cavium ThunderX, T81 pass 1.0 */
+               .desc = "Cavium erratum 27456",
+               .capability = ARM64_WORKAROUND_CAVIUM_27456,
+               MIDR_RANGE(MIDR_THUNDERX_81XX, 0x00, 0x00),
+       },
 #endif
        {
        }
-- 
1.8.1.4