| Message ID | 1588426445-24344-6-git-send-email-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64/cpufeature: Introduce ID_PFR2, ID_DFR1, ID_MMFR5 and other changes | expand |
On 05/02/2020 02:33 PM, Anshuman Khandual wrote: > This adds basic building blocks required for ID_DFR1 CPU register which > provides top level information about the debug system in AArch32 state. > This is added per ARM DDI 0487F.a specification. > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Cc: Marc Zyngier <maz@kernel.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: James Morse <james.morse@arm.com> > Cc: Suzuki K Poulose <suzuki.poulose@arm.com> > Cc: kvmarm@lists.cs.columbia.edu > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > > Suggested-by: Will Deacon <will@kernel.org> > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > arch/arm64/include/asm/cpu.h | 1 + > arch/arm64/include/asm/sysreg.h | 3 +++ > arch/arm64/kernel/cpufeature.c | 10 ++++++++++ > arch/arm64/kernel/cpuinfo.c | 1 + > arch/arm64/kvm/sys_regs.c | 2 +- > 5 files changed, 16 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h > index 464e828a994d..d9a78bdec409 100644 > --- a/arch/arm64/include/asm/cpu.h > +++ b/arch/arm64/include/asm/cpu.h > @@ -33,6 +33,7 @@ struct cpuinfo_arm64 { > u64 reg_id_aa64zfr0; > > u32 reg_id_dfr0; > + u32 reg_id_dfr1; > u32 reg_id_isar0; > u32 reg_id_isar1; > u32 reg_id_isar2; > diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h > index c977449e02db..2e1e922e1409 100644 > --- a/arch/arm64/include/asm/sysreg.h > +++ b/arch/arm64/include/asm/sysreg.h > @@ -154,6 +154,7 @@ > #define SYS_MVFR1_EL1 sys_reg(3, 0, 0, 3, 1) > #define SYS_MVFR2_EL1 sys_reg(3, 0, 0, 3, 2) > #define SYS_ID_PFR2_EL1 sys_reg(3, 0, 0, 3, 4) > +#define SYS_ID_DFR1_EL1 sys_reg(3, 0, 0, 3, 5) > > #define SYS_ID_AA64PFR0_EL1 sys_reg(3, 0, 0, 4, 0) > #define SYS_ID_AA64PFR1_EL1 sys_reg(3, 0, 0, 4, 1) > @@ -763,6 +764,8 @@ > #define ID_ISAR4_WITHSHIFTS_SHIFT 4 > #define ID_ISAR4_UNPRIV_SHIFT 0 > > +#define ID_DFR1_MTPMU_SHIFT 0 > + > #define ID_ISAR0_DIVIDE_SHIFT 24 > #define ID_ISAR0_DEBUG_SHIFT 20 > #define ID_ISAR0_COPROC_SHIFT 16 > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index a8247bf92959..2ce952d9668d 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -451,6 +451,11 @@ static const struct arm64_ftr_bits ftr_id_dfr0[] = { > ARM64_FTR_END, > }; > > +static const struct arm64_ftr_bits ftr_id_dfr1[] = { > + S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_MTPMU_SHIFT, 4, 0), > - ID_UNALLOCATED(3,5), > + ID_SANITISED(ID_DFR1_EL1), > ID_UNALLOCATED(3,6), > ID_UNALLOCATED(3,7), > IIUC, we should not expose the MTPMU to the KVM guests. Either we could drop this entire patch, or we should emulate the MTPMU to 0 in KVM. Suzuki
diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index 464e828a994d..d9a78bdec409 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -33,6 +33,7 @@ struct cpuinfo_arm64 { u64 reg_id_aa64zfr0; u32 reg_id_dfr0; + u32 reg_id_dfr1; u32 reg_id_isar0; u32 reg_id_isar1; u32 reg_id_isar2; diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index c977449e02db..2e1e922e1409 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -154,6 +154,7 @@ #define SYS_MVFR1_EL1 sys_reg(3, 0, 0, 3, 1) #define SYS_MVFR2_EL1 sys_reg(3, 0, 0, 3, 2) #define SYS_ID_PFR2_EL1 sys_reg(3, 0, 0, 3, 4) +#define SYS_ID_DFR1_EL1 sys_reg(3, 0, 0, 3, 5) #define SYS_ID_AA64PFR0_EL1 sys_reg(3, 0, 0, 4, 0) #define SYS_ID_AA64PFR1_EL1 sys_reg(3, 0, 0, 4, 1) @@ -763,6 +764,8 @@ #define ID_ISAR4_WITHSHIFTS_SHIFT 4 #define ID_ISAR4_UNPRIV_SHIFT 0 +#define ID_DFR1_MTPMU_SHIFT 0 + #define ID_ISAR0_DIVIDE_SHIFT 24 #define ID_ISAR0_DEBUG_SHIFT 20 #define ID_ISAR0_COPROC_SHIFT 16 diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index a8247bf92959..2ce952d9668d 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -451,6 +451,11 @@ static const struct arm64_ftr_bits ftr_id_dfr0[] = { ARM64_FTR_END, }; +static const struct arm64_ftr_bits ftr_id_dfr1[] = { + S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_DFR1_MTPMU_SHIFT, 4, 0), + ARM64_FTR_END, +}; + static const struct arm64_ftr_bits ftr_zcr[] = { ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ZCR_ELx_LEN_SHIFT, ZCR_ELx_LEN_SIZE, 0), /* LEN */ @@ -521,6 +526,7 @@ static const struct __ftr_reg_entry { ARM64_FTR_REG(SYS_MVFR1_EL1, ftr_generic_32bits), ARM64_FTR_REG(SYS_MVFR2_EL1, ftr_mvfr2), ARM64_FTR_REG(SYS_ID_PFR2_EL1, ftr_id_pfr2), + ARM64_FTR_REG(SYS_ID_DFR1_EL1, ftr_id_dfr1), /* Op1 = 0, CRn = 0, CRm = 4 */ ARM64_FTR_REG(SYS_ID_AA64PFR0_EL1, ftr_id_aa64pfr0), @@ -714,6 +720,7 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info) if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { init_cpu_ftr_reg(SYS_ID_DFR0_EL1, info->reg_id_dfr0); + init_cpu_ftr_reg(SYS_ID_DFR1_EL1, info->reg_id_dfr1); init_cpu_ftr_reg(SYS_ID_ISAR0_EL1, info->reg_id_isar0); init_cpu_ftr_reg(SYS_ID_ISAR1_EL1, info->reg_id_isar1); init_cpu_ftr_reg(SYS_ID_ISAR2_EL1, info->reg_id_isar2); @@ -829,6 +836,8 @@ static int update_32bit_cpu_features(int cpu, struct cpuinfo_arm64 *info, taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu, info->reg_id_dfr0, boot->reg_id_dfr0); + taint |= check_update_ftr_reg(SYS_ID_DFR1_EL1, cpu, + info->reg_id_dfr1, boot->reg_id_dfr1); taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu, info->reg_id_isar0, boot->reg_id_isar0); taint |= check_update_ftr_reg(SYS_ID_ISAR1_EL1, cpu, @@ -992,6 +1001,7 @@ static u64 __read_sysreg_by_encoding(u32 sys_id) read_sysreg_case(SYS_ID_PFR1_EL1); read_sysreg_case(SYS_ID_PFR2_EL1); read_sysreg_case(SYS_ID_DFR0_EL1); + read_sysreg_case(SYS_ID_DFR1_EL1); read_sysreg_case(SYS_ID_MMFR0_EL1); read_sysreg_case(SYS_ID_MMFR1_EL1); read_sysreg_case(SYS_ID_MMFR2_EL1); diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index cb79b083f97f..50a281703d9d 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -362,6 +362,7 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) /* Update the 32bit ID registers only if AArch32 is implemented */ if (id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) { info->reg_id_dfr0 = read_cpuid(ID_DFR0_EL1); + info->reg_id_dfr1 = read_cpuid(ID_DFR1_EL1); info->reg_id_isar0 = read_cpuid(ID_ISAR0_EL1); info->reg_id_isar1 = read_cpuid(ID_ISAR1_EL1); info->reg_id_isar2 = read_cpuid(ID_ISAR2_EL1); diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index b784b156edb3..c78aa15aaac8 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1457,7 +1457,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_SANITISED(MVFR2_EL1), ID_UNALLOCATED(3,3), ID_SANITISED(ID_PFR2_EL1), - ID_UNALLOCATED(3,5), + ID_SANITISED(ID_DFR1_EL1), ID_UNALLOCATED(3,6), ID_UNALLOCATED(3,7),
This adds basic building blocks required for ID_DFR1 CPU register which provides top level information about the debug system in AArch32 state. This is added per ARM DDI 0487F.a specification. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- arch/arm64/include/asm/cpu.h | 1 + arch/arm64/include/asm/sysreg.h | 3 +++ arch/arm64/kernel/cpufeature.c | 10 ++++++++++ arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/kvm/sys_regs.c | 2 +- 5 files changed, 16 insertions(+), 1 deletion(-)