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arm64: Add workaround for Fujitsu A64FX erratum 010001

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On the Fujitsu-A64FX cores ver(1.0, 1.1), memory access may cause
an undefined fault (Data abort, DFSC=0b111111). This fault occurs under
a specific hardware condition when a load/store instruction performs an
address translation. Any load/store instruction, except non-fault access
including Armv8 and SVE might cause this undefined fault.

The TCR_ELx.NFD1 bit is used by the kernel when CONFIG_RANDOMIZE_BASE
is enabled to mitigate timing attacks against KASLR where the kernel
address space could be probed using the FFR and suppressed fault on
SVE loads.

Since this erratum causes spurious exceptions, which may corrupt
the exception registers, we clear the TCR_ELx.NFDx=1 bits when
booting on an affected CPU.

Signed-off-by: Zhang Lei <zhang.lei@jp.fujitsu.com>
[Generated MIDR value/mask for __cpu_setup(), removed spurious-fault handler
 and always disabled the NFDx bits on affected CPUs]
Signed-off-by: James Morse <james.morse@arm.com>
Tested-by: zhang.lei <zhang.lei@jp.fujitsu.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Zhang Lei 2019-02-26 18:43:41 +00:00 committed by Catalin Marinas
parent 4caf8758b6
commit 3e32131abc
6 changed files with 51 additions and 0 deletions
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1
Documentation/arm64/silicon-errata.txt
View File

@ -80,3 +80,4 @@ stable kernels.
| 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 |

19
arch/arm64/Kconfig
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@ -643,6 +643,25 @@ config QCOM_FALKOR_ERRATUM_E1041
If unsure, say Y.
config FUJITSU_ERRATUM_010001
bool "Fujitsu-A64FX erratum E#010001: Undefined fault may occur wrongly"
default y
help
This option adds workaround for Fujitsu-A64FX erratum E#010001.
On some variants of the Fujitsu-A64FX cores ver(1.0, 1.1), memory
accesses may cause undefined fault (Data abort, DFSC=0b111111).
This fault occurs under a specific hardware condition when a
load/store instruction performs an address translation using:
case-1 TTBR0_EL1 with TCR_EL1.NFD0 == 1.
case-2 TTBR0_EL2 with TCR_EL2.NFD0 == 1.
case-3 TTBR1_EL1 with TCR_EL1.NFD1 == 1.
case-4 TTBR1_EL2 with TCR_EL2.NFD1 == 1.
The workaround is to ensure these bits are clear in TCR_ELx.
The workaround only affect the Fujitsu-A64FX.
If unsure, say Y.
endmenu

20
arch/arm64/include/asm/assembler.h
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@ -27,6 +27,7 @@
#include <asm/asm-offsets.h>
#include <asm/cpufeature.h>
#include <asm/cputype.h>
#include <asm/debug-monitors.h>
#include <asm/page.h>
#include <asm/pgtable-hwdef.h>
@ -596,6 +597,25 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU
#endif
.endm
/*
* tcr_clear_errata_bits - Clear TCR bits that trigger an errata on this CPU.
*/
.macro tcr_clear_errata_bits, tcr, tmp1, tmp2
#ifdef CONFIG_FUJITSU_ERRATUM_010001
mrs \tmp1, midr_el1
mov_q \tmp2, MIDR_FUJITSU_ERRATUM_010001_MASK
and \tmp1, \tmp1, \tmp2
mov_q \tmp2, MIDR_FUJITSU_ERRATUM_010001
cmp \tmp1, \tmp2
b.ne 10f
mov_q \tmp2, TCR_CLEAR_FUJITSU_ERRATUM_010001
bic \tcr, \tcr, \tmp2
10:
#endif /* CONFIG_FUJITSU_ERRATUM_010001 */
.endm
/**
* Errata workaround prior to disable MMU. Insert an ISB immediately prior
* to executing the MSR that will change SCTLR_ELn[M] from a value of 1 to 0.

9
arch/arm64/include/asm/cputype.h
View File

@ -76,6 +76,7 @@
#define ARM_CPU_IMP_BRCM 0x42
#define ARM_CPU_IMP_QCOM 0x51
#define ARM_CPU_IMP_NVIDIA 0x4E
#define ARM_CPU_IMP_FUJITSU 0x46
#define ARM_CPU_PART_AEM_V8 0xD0F
#define ARM_CPU_PART_FOUNDATION 0xD00
@ -104,6 +105,8 @@
#define NVIDIA_CPU_PART_DENVER 0x003
#define NVIDIA_CPU_PART_CARMEL 0x004
#define FUJITSU_CPU_PART_A64FX 0x001
#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_CORTEX_A72 MIDR_CPU_MODEL(ARM_CPU_IMP_ARM, ARM_CPU_PART_CORTEX_A72)
@ -122,6 +125,12 @@
#define MIDR_QCOM_KRYO MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_KRYO)
#define MIDR_NVIDIA_DENVER MIDR_CPU_MODEL(ARM_CPU_IMP_NVIDIA, NVIDIA_CPU_PART_DENVER)
#define MIDR_NVIDIA_CARMEL MIDR_CPU_MODEL(ARM_CPU_IMP_NVIDIA, NVIDIA_CPU_PART_CARMEL)
#define MIDR_FUJITSU_A64FX MIDR_CPU_MODEL(ARM_CPU_IMP_FUJITSU, FUJITSU_CPU_PART_A64FX)
/* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
#define MIDR_FUJITSU_ERRATUM_010001 MIDR_FUJITSU_A64FX
#define MIDR_FUJITSU_ERRATUM_010001_MASK (~MIDR_VARIANT(1))
#define TCR_CLEAR_FUJITSU_ERRATUM_010001 (TCR_NFD1 | TCR_NFD0)
#ifndef __ASSEMBLY__

1
arch/arm64/include/asm/pgtable-hwdef.h
View File

@ -302,6 +302,7 @@
#define TCR_TBI1 (UL(1) << 38)
#define TCR_HA (UL(1) << 39)
#define TCR_HD (UL(1) << 40)
#define TCR_NFD0 (UL(1) << 53)
#define TCR_NFD1 (UL(1) << 54)
/*

1
arch/arm64/mm/proc.S
View File

@ -445,6 +445,7 @@ ENTRY(__cpu_setup)
ldr x10, =TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \
TCR_TBI0 | TCR_A1 | TCR_KASAN_FLAGS
tcr_clear_errata_bits x10, x9, x5
#ifdef CONFIG_ARM64_USER_VA_BITS_52
ldr_l x9, vabits_user