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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Aug 01, 2023 at 04:12:30PM +0100, Will Deacon wrote: > Hey Joey, > > On Tue, Aug 01, 2023 at 11:00:07AM +0100, Joey Gouly wrote: > > Add a HWCAP for FEAT_HBC, so that userspace can make a decision on using > > this feature. > > > > Signed-off-by: Joey Gouly > > Cc: Catalin Marinas > > Cc: Will Deacon > > [...] > > > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > > index f9d456fe132d..ac764c1dac36 100644 > > --- a/arch/arm64/kernel/cpufeature.c > > +++ b/arch/arm64/kernel/cpufeature.c > > @@ -222,7 +222,7 @@ static const struct arm64_ftr_bits ftr_id_aa64isar1[] = { > > static const struct arm64_ftr_bits ftr_id_aa64isar2[] = { > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_CSSC_SHIFT, 4, 0), > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_RPRFM_SHIFT, 4, 0), > > - ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64ISAR2_EL1_BC_SHIFT, 4, 0), > > + ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_HIGHER_SAFE, ID_AA64ISAR2_EL1_BC_SHIFT, 4, 0), > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR2_EL1_MOPS_SHIFT, 4, 0), > > ARM64_FTR_BITS(FTR_VISIBLE_IF_IS_ENABLED(CONFIG_ARM64_PTR_AUTH), > > FTR_STRICT, FTR_EXACT, ID_AA64ISAR2_EL1_APA3_SHIFT, 4, 0), > > @@ -2844,6 +2844,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = { > > HWCAP_CAP(ID_AA64ISAR2_EL1, RPRES, IMP, CAP_HWCAP, KERNEL_HWCAP_RPRES), > > HWCAP_CAP(ID_AA64ISAR2_EL1, WFxT, IMP, CAP_HWCAP, KERNEL_HWCAP_WFXT), > > HWCAP_CAP(ID_AA64ISAR2_EL1, MOPS, IMP, CAP_HWCAP, KERNEL_HWCAP_MOPS), > > + HWCAP_CAP(ID_AA64ISAR2_EL1, BC, IMP, CAP_HWCAP, KERNEL_HWCAP_HBC), > > #ifdef CONFIG_ARM64_SME > > HWCAP_CAP(ID_AA64PFR1_EL1, SME, IMP, CAP_HWCAP, KERNEL_HWCAP_SME), > > HWCAP_CAP(ID_AA64SMFR0_EL1, FA64, IMP, CAP_HWCAP, KERNEL_HWCAP_SME_FA64), > > diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c > > index 58622dc85917..98fda8500535 100644 > > --- a/arch/arm64/kernel/cpuinfo.c > > +++ b/arch/arm64/kernel/cpuinfo.c > > @@ -126,6 +126,7 @@ static const char *const hwcap_str[] = { > > [KERNEL_HWCAP_SME_B16B16] = "smeb16b16", > > [KERNEL_HWCAP_SME_F16F16] = "smef16f16", > > [KERNEL_HWCAP_MOPS] = "mops", > > + [KERNEL_HWCAP_HBC] = "hbc", > > I'm a bit confused from the Arm ARM as to the use of "hbc" vs "bc"... I > don't really mind what we go for, but given this is userspace-visible, have > you run the string past the toolchain folks at all? I guess I'm wary of > what a future extension might look like and whether we'll be stuck with > non-architectural terminology such as "hbc2" to advertise it if we go with > your suggestion here rather than "bc". I just checked LLVM and binutils, they also call it 'hbc'. .arch armv8.7-a+hbc https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gas/testsuite/gas/aarch64/hbc.s;h=23af6ba8edd662463ae3403e62d94ef838f87fd1;hb=HEAD#l35 https://github.com/llvm/llvm-project/blob/b31be75ff4d1aed94914d5ef53a903d034d5b6ad/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp#L3600 So it seems that's the name that has been settled on? If you're fine with that, I will send a v2 fixing up the inline asm. Thanks, Joey _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel