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arm64/cpufeature: Introduce ID_DFR1 CPU register

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This adds basic building blocks required for ID_DFR1 CPU register which
provides top level information about the debug system in AArch32 state.
We hide the register from KVM guests, as we don't emulate the 'MTPMU'
feature.

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>
Reviewed-by : Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1589881254-10082-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Anshuman Khandual 2020-05-19 15:10:42 +05:30 committed by Will Deacon
parent 16824085a7
commit dd35ec0704
5 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/cpu.h
View File

@ -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;

3
arch/arm64/include/asm/sysreg.h
View File

@ -140,6 +140,7 @@
#define SYS_ID_PFR1_EL1 sys_reg(3, 0, 0, 1, 1)
#define SYS_ID_PFR2_EL1 sys_reg(3, 0, 0, 3, 4)
#define SYS_ID_DFR0_EL1 sys_reg(3, 0, 0, 1, 2)
#define SYS_ID_DFR1_EL1 sys_reg(3, 0, 0, 3, 5)
#define SYS_ID_AFR0_EL1 sys_reg(3, 0, 0, 1, 3)
#define SYS_ID_MMFR0_EL1 sys_reg(3, 0, 0, 1, 4)
#define SYS_ID_MMFR1_EL1 sys_reg(3, 0, 0, 1, 5)
@ -767,6 +768,8 @@
#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

10
arch/arm64/kernel/cpufeature.c
View File

@ -457,6 +457,11 @@ 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 */
@ -527,6 +532,7 @@ 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),
@ -720,6 +726,7 @@ 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);
@ -835,6 +842,8 @@ 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,
@ -998,6 +1007,7 @@ 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);

1
arch/arm64/kernel/cpuinfo.c
View File

@ -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);

2
arch/arm64/kvm/sys_regs.c
View File

@ -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_HIDDEN(ID_DFR1_EL1),
ID_UNALLOCATED(3,6),
ID_UNALLOCATED(3,7),