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| author | Jason Liu <r64343@freescale.com> | 2015-07-24 17:06:11 +0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2015-07-24 18:00:56 +0800 |
| commit | 79fc71b538ea4ff0ce3f02c82dce61c57e2e9a1e (patch) | |
| tree | 3cbfa04b64e636ca47f5e29d3867b9e8d94c424a /arch | |
| parent | bc4f1c5a938d81e2f0299aa23aff034a3b0ada42 (diff) | |
MLK-11284 ARM: ERRATA: Add ARM/MP: 814220 SW workaround
ARM/MP: 814220—B-Cache maintenance by set/way operations can execute out of order.
Description:
The v7 ARM states that all cache and branch predictor maintenance operations
that do not specify an address execute, relative to each other, in program
order. However, because of this erratum, an L2 set/way cache maintenance
operation can overtake an L1 set/way cache maintenance operation, this would
cause the data corruption.
This ERRATA affected the Cortex-A7 and present in r0p2, r0p3, r0p4, r0p5.
This patch is the SW workaround by adding a DSB before changing cache levels as
the ARM ERRATA: ARM/MP: 814220 told in the ARM ERRATA documentation.
Signed-off-by: Jason Liu <r64343@freescale.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 10 | ||||
| -rw-r--r-- | arch/arm/mach-imx/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/mm/cache-v7.S | 3 |
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index af00d12b4803..8041d312b8e2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1391,6 +1391,16 @@ config ARM_ERRATA_773022 loop buffer may deliver incorrect instructions. This workaround disables the loop buffer to avoid the erratum. +config ARM_ERRATA_814220 + bool "ARM errata: Cache maintenance by set/way operations can execute out of order" + depends on CPU_V7 + help + The v7 ARM states that all cache and branch predictor maintenance operations + that do not specify an address execute, relative to each other, in program order. + However, because of this erratum, an L2 set/way cache maintenance operation can + overtake an L1 set/way cache maintenance operation. This ERRATA only affected the + Cortex-A7 and present in r0p2, r0p3, r0p4, r0p5. + endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig index 117100a2e1da..b883e2a07c56 100644 --- a/arch/arm/mach-imx/Kconfig +++ b/arch/arm/mach-imx/Kconfig @@ -861,6 +861,7 @@ config SOC_IMX6UL select MIGHT_HAVE_PCI select PCI_DOMAINS if PCI select SOC_IMX6 + select ARM_ERRATA_814220 help This enables support for Freescale i.MX6 UltraLite processor. @@ -871,6 +872,7 @@ config SOC_IMX7 select ARM_GIC select HAVE_SMP select HAVE_IMX_DDRC + select ARM_ERRATA_814220 config SOC_IMX7D bool "i.MX7 Dual support" diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S index 778bcf88ee79..c994f5c0afeb 100644 --- a/arch/arm/mm/cache-v7.S +++ b/arch/arm/mm/cache-v7.S @@ -162,6 +162,9 @@ loop2: skip: add r10, r10, #2 @ increment cache number cmp r3, r10 +#ifdef CONFIG_ARM_ERRATA_814220 + dsb +#endif bgt flush_levels finished: mov r10, #0 @ swith back to cache level 0 |