Re: [PATCH v6] arm64: Work around Falkor erratum 1003
On 02/08/2017 11:34 AM, Catalin Marinas wrote: > On Tue, Feb 07, 2017 at 07:35:16PM -0500, Christopher Covington wrote: >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -480,6 +480,18 @@ config CAVIUM_ERRATUM_27456 >> >>If unsure, say Y. >> >> +config QCOM_FALKOR_ERRATUM_1003 >> +bool "Falkor E1003: Incorrect translation due to ASID change" >> +default y >> +select ARM64_PAN if ARM64_SW_TTBR0_PAN >> +help >> + On Falkor v1, an incorrect ASID may be cached in the TLB when ASID >> + and BADDR are changed together in TTBRx_EL1. The workaround for this >> + issue is to use a reserved ASID in cpu_do_switch_mm() before >> + switching to the new ASID. >> + >> + If unsure, say Y. > > It would be good to have a comment here on why PAN is selected. > >> --- a/arch/arm64/mm/context.c >> +++ b/arch/arm64/mm/context.c >> @@ -79,6 +79,13 @@ void verify_cpu_asid_bits(void) >> } >> } >> >> +static void set_reserved_asid_bits(void) >> +{ >> +if (IS_ENABLED(CONFIG_QCOM_FALKOR_ERRATUM_1003) && >> +cpus_have_cap(ARM64_WORKAROUND_QCOM_FALKOR_E1003)) >> +__set_bit(FALKOR_RESERVED_ASID, asid_map); >> +} > > You should use cpus_have_const_cap() as it would be optimised using jump > labels. Thanks Catalin. Done in v7. Cov -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
Re: [PATCH v6] arm64: Work around Falkor erratum 1003
On 02/08/2017 11:34 AM, Catalin Marinas wrote: > On Tue, Feb 07, 2017 at 07:35:16PM -0500, Christopher Covington wrote: >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -480,6 +480,18 @@ config CAVIUM_ERRATUM_27456 >> >>If unsure, say Y. >> >> +config QCOM_FALKOR_ERRATUM_1003 >> +bool "Falkor E1003: Incorrect translation due to ASID change" >> +default y >> +select ARM64_PAN if ARM64_SW_TTBR0_PAN >> +help >> + On Falkor v1, an incorrect ASID may be cached in the TLB when ASID >> + and BADDR are changed together in TTBRx_EL1. The workaround for this >> + issue is to use a reserved ASID in cpu_do_switch_mm() before >> + switching to the new ASID. >> + >> + If unsure, say Y. > > It would be good to have a comment here on why PAN is selected. > >> --- a/arch/arm64/mm/context.c >> +++ b/arch/arm64/mm/context.c >> @@ -79,6 +79,13 @@ void verify_cpu_asid_bits(void) >> } >> } >> >> +static void set_reserved_asid_bits(void) >> +{ >> +if (IS_ENABLED(CONFIG_QCOM_FALKOR_ERRATUM_1003) && >> +cpus_have_cap(ARM64_WORKAROUND_QCOM_FALKOR_E1003)) >> +__set_bit(FALKOR_RESERVED_ASID, asid_map); >> +} > > You should use cpus_have_const_cap() as it would be optimised using jump > labels. Thanks Catalin. Done in v7. Cov -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
Re: [PATCH v6] arm64: Work around Falkor erratum 1003
On Tue, Feb 07, 2017 at 07:35:16PM -0500, Christopher Covington wrote: > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -480,6 +480,18 @@ config CAVIUM_ERRATUM_27456 > > If unsure, say Y. > > +config QCOM_FALKOR_ERRATUM_1003 > + bool "Falkor E1003: Incorrect translation due to ASID change" > + default y > + select ARM64_PAN if ARM64_SW_TTBR0_PAN > + help > + On Falkor v1, an incorrect ASID may be cached in the TLB when ASID > + and BADDR are changed together in TTBRx_EL1. The workaround for this > + issue is to use a reserved ASID in cpu_do_switch_mm() before > + switching to the new ASID. > + > + If unsure, say Y. It would be good to have a comment here on why PAN is selected. > --- a/arch/arm64/mm/context.c > +++ b/arch/arm64/mm/context.c > @@ -79,6 +79,13 @@ void verify_cpu_asid_bits(void) > } > } > > +static void set_reserved_asid_bits(void) > +{ > + if (IS_ENABLED(CONFIG_QCOM_FALKOR_ERRATUM_1003) && > + cpus_have_cap(ARM64_WORKAROUND_QCOM_FALKOR_E1003)) > + __set_bit(FALKOR_RESERVED_ASID, asid_map); > +} You should use cpus_have_const_cap() as it would be optimised using jump labels. -- Catalin
Re: [PATCH v6] arm64: Work around Falkor erratum 1003
On Tue, Feb 07, 2017 at 07:35:16PM -0500, Christopher Covington wrote: > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -480,6 +480,18 @@ config CAVIUM_ERRATUM_27456 > > If unsure, say Y. > > +config QCOM_FALKOR_ERRATUM_1003 > + bool "Falkor E1003: Incorrect translation due to ASID change" > + default y > + select ARM64_PAN if ARM64_SW_TTBR0_PAN > + help > + On Falkor v1, an incorrect ASID may be cached in the TLB when ASID > + and BADDR are changed together in TTBRx_EL1. The workaround for this > + issue is to use a reserved ASID in cpu_do_switch_mm() before > + switching to the new ASID. > + > + If unsure, say Y. It would be good to have a comment here on why PAN is selected. > --- a/arch/arm64/mm/context.c > +++ b/arch/arm64/mm/context.c > @@ -79,6 +79,13 @@ void verify_cpu_asid_bits(void) > } > } > > +static void set_reserved_asid_bits(void) > +{ > + if (IS_ENABLED(CONFIG_QCOM_FALKOR_ERRATUM_1003) && > + cpus_have_cap(ARM64_WORKAROUND_QCOM_FALKOR_E1003)) > + __set_bit(FALKOR_RESERVED_ASID, asid_map); > +} You should use cpus_have_const_cap() as it would be optimised using jump labels. -- Catalin