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Message-Id: <1446547275-23481-1-git-send-email-wxt@rock-chips.com> Date: Tue, 3 Nov 2015 18:41:15 +0800 From: Caesar Wang <wxt@...k-chips.com> To: linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org Cc: heiko@...ech.de, hl@...k-chips.com, sjg@...omium.org, j.stone@...sung.com, dianders@...omium.org, linux-rockchip@...ts.infradead.org, cwz@...k-chips.com, huangtao@...k-chips.com, kever.yang@...k-chips.com, wxt@...k-chips.com, ard.biesheuvel@...aro.org, gregory.clement@...e-electrons.com, sboyd@...eaurora.org, linux-kernel@...r.kernel.org, thomas.petazzoni@...e-electrons.com, nadavh@...vell.com Subject: [PATCH v1] ARM: errata: Workaround for Cortex-A12 erratum 818325 From: Huang Tao <huangtao@...k-chips.com> On Cortex-A12 (r0p0..r0p1-00lac0-rc11), when a CPU executes a sequence of two conditional store instructions with opposite condition code and updating the same register, the system might enter a deadlock if the second conditional instruction is an UNPREDICTABLE STR or STM instruction. This workaround setting bit[12] of the Feature Register prevents the erratum. This bit disables an optimisation applied to a sequence of 2 instructions that use opposing condition codes. Signed-off-by: Huang Tao <huangtao@...k-chips.com> Signed-off-by: Kever Yang <kever.yang@...k-chips.com> Signed-off-by: Caesar Wang <wxt@...k-chips.com> --- Changes in v1: - fix the build error. arch/arm/Kconfig | 13 +++++++++++++ arch/arm/mm/proc-v7.S | 16 ++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 639411f..554b57a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1263,6 +1263,19 @@ config ARM_ERRATA_773022 loop buffer may deliver incorrect instructions. This workaround disables the loop buffer to avoid the erratum. +config ARM_ERRATA_818325 + bool "ARM errata: Execution of an UNPREDICTABLE STR or STM instruction might deadlock" + depends on CPU_V7 + help + This option enables the workaround for the 818325 Cortex-A12 + (r0p0..r0p1-00lac0-rc11) erratum. When a CPU executes a sequence of + two conditional store instructions with opposite condition code and + updating the same register, the system might enter a deadlock if the + second conditional instruction is an UNPREDICTABLE STR or STM + instruction. This workaround setting bit[12] of the Feature Register + prevents the erratum. This bit disables an optimisation applied to a + sequence of 2 instructions that use opposing condition codes. + endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index de2b246..e95c83c 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -351,6 +351,17 @@ __ca9_errata: #endif b __errata_finish +__ca12_errata: +#ifdef CONFIG_ARM_ERRATA_818325 + teq r6, #0x00 @ present in r0p0 + teqne r6, #0x01 @ present in r0p1-00lac0-rc11 + mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register + orreq r10, r10, #1 << 12 @ set bit #12 + mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register + isb +#endif + b __errata_finish + __ca15_errata: #ifdef CONFIG_ARM_ERRATA_773022 cmp r6, #0x4 @ only present up to r0p4 @@ -439,6 +450,11 @@ __v7_setup_cont: teq r0, r10 beq __ca9_errata + /* Cortex-A12 Errata */ + ldr r10, =0x00000c0d @ Cortex-A12 primary part number + teq r0, r10 + beq __ca12_errata + /* Cortex-A15 Errata */ ldr r10, =0x00000c0f @ Cortex-A15 primary part number teq r0, r10 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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