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arm64: Expose DC CVADP to userspace 

ARMv8.5 builds upon the ARMv8.2 DC CVAP instruction by introducing a DC
CVADP instruction which cleans the data cache to the point of deep
persistence. Let's expose this support via the arm64 ELF hwcaps.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Andrew Murray 2019-04-09 10:52:43 +01:00 committed by Will Deacon
parent d16ed4105f
commit 671db58181
5 changed files with 12 additions and 0 deletions
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4
Documentation/arm64/elf_hwcaps.txt
View File

@ -135,6 +135,10 @@ HWCAP_DCPOP
Functionality implied by ID_AA64ISAR1_EL1.DPB == 0b0001.
HWCAP2_DCPODP
Functionality implied by ID_AA64ISAR1_EL1.DPB == 0b0010.
HWCAP_SHA3
Functionality implied by ID_AA64ISAR0_EL1.SHA3 == 0b0001.

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

@ -88,6 +88,7 @@
#define KERNEL_HWCAP_PACG __khwcap_feature(PACG)
#define __khwcap2_feature(x) (const_ilog2(HWCAP2_ ## x) + 32)
#define KERNEL_HWCAP_DCPODP __khwcap2_feature(DCPODP)
/*
* This yields a mask that user programs can use to figure out what

5
arch/arm64/include/uapi/asm/hwcap.h
View File

@ -53,4 +53,9 @@
#define HWCAP_PACA (1 << 30)
#define HWCAP_PACG (1UL << 31)
/*
* HWCAP2 flags - for AT_HWCAP2
*/
#define HWCAP2_DCPODP (1 << 0)
#endif /* _UAPI__ASM_HWCAP_H */

1
arch/arm64/kernel/cpufeature.c
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@ -1591,6 +1591,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_ASIMD_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_ASIMDHP),
HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_DIT_SHIFT, FTR_SIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DIT),
HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_DCPOP),
HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_DPB_SHIFT, FTR_UNSIGNED, 2, CAP_HWCAP, KERNEL_HWCAP_DCPODP),
HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_JSCVT_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_JSCVT),
HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_FCMA_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_FCMA),
HWCAP_CAP(SYS_ID_AA64ISAR1_EL1, ID_AA64ISAR1_LRCPC_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, KERNEL_HWCAP_LRCPC),

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

@ -85,6 +85,7 @@ static const char *const hwcap_str[] = {
"sb",
"paca",
"pacg",
"dcpodp",
NULL
};