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    SubjectRe: [PATCH v2 1/7] powerpc: Add TIDR CPU feature for Power9
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    Le 18/04/2018 à 03:08, Alastair D'Silva a écrit :
    > From: Alastair D'Silva <alastair@d-silva.org>
    >
    > This patch adds a CPU feature bit to show whether the CPU has
    > the TIDR register available, enabling as_notify/wait in userspace.
    >
    > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
    > ---
    > arch/powerpc/include/asm/cputable.h | 3 ++-
    > arch/powerpc/kernel/dt_cpu_ftrs.c | 1 +
    > 2 files changed, 3 insertions(+), 1 deletion(-)
    >
    > diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
    > index 4e332f3531c5..54c4cbbe57b4 100644
    > --- a/arch/powerpc/include/asm/cputable.h
    > +++ b/arch/powerpc/include/asm/cputable.h
    > @@ -215,6 +215,7 @@ static inline void cpu_feature_keys_init(void) { }
    > #define CPU_FTR_P9_TM_HV_ASSIST LONG_ASM_CONST(0x0000100000000000)
    > #define CPU_FTR_P9_TM_XER_SO_BUG LONG_ASM_CONST(0x0000200000000000)
    > #define CPU_FTR_P9_TLBIE_BUG LONG_ASM_CONST(0x0000400000000000)
    > +#define CPU_FTR_P9_TIDR LONG_ASM_CONST(0x0000800000000000)
    >
    > #ifndef __ASSEMBLY__
    >
    > @@ -462,7 +463,7 @@ static inline void cpu_feature_keys_init(void) { }
    > CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
    > CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_ARCH_207S | \
    > CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | CPU_FTR_PKEY | \
    > - CPU_FTR_P9_TLBIE_BUG)
    > + CPU_FTR_P9_TLBIE_BUG | CPU_FTR_P9_TIDR)
    > #define CPU_FTRS_POWER9_DD1 ((CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD1) & \
    > (~CPU_FTR_SAO))
    > #define CPU_FTRS_POWER9_DD2_0 CPU_FTRS_POWER9
    > diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
    > index 11a3a4fed3fb..10f8b7f55637 100644
    > --- a/arch/powerpc/kernel/dt_cpu_ftrs.c
    > +++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
    > @@ -722,6 +722,7 @@ static __init void cpufeatures_cpu_quirks(void)
    > if ((version & 0xffff0000) == 0x004e0000) {
    > cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
    > cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_BUG; > + cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR;


    Isn't it redundant with adding the flag to CPU_FTRS_POWER9?

    Fred


    > }
    > }
    >

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