ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd
Advanced Dot product is a feature present in AArch32 state for Armv8 and is represented by ISAR6 identification register. This feature denotes the presence of UDOT and SDOT instructions and hence adding a hwcap will enable the userspace to check it before trying to use those instructions. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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c00a19c8b1
Коммит
62ea0d873a
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@ -30,6 +30,7 @@
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#define HWCAP_EVTSTRM (1 << 21)
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#define HWCAP_EVTSTRM (1 << 21)
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#define HWCAP_FPHP (1 << 22)
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#define HWCAP_FPHP (1 << 22)
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#define HWCAP_ASIMDHP (1 << 23)
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#define HWCAP_ASIMDHP (1 << 23)
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#define HWCAP_ASIMDDP (1 << 24)
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/*
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/*
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* HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2
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* HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2
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@ -1251,6 +1251,7 @@ static const char *hwcap_str[] = {
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"evtstrm",
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"evtstrm",
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"fphp",
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"fphp",
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"asimdhp",
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"asimdhp",
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"asimddp",
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NULL
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NULL
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};
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};
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@ -774,6 +774,7 @@ static int __init vfp_init(void)
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{
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{
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unsigned int vfpsid;
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unsigned int vfpsid;
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unsigned int cpu_arch = cpu_architecture();
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unsigned int cpu_arch = cpu_architecture();
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unsigned int isar6;
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/*
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/*
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* Enable the access to the VFP on all online CPUs so the
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* Enable the access to the VFP on all online CPUs so the
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@ -836,6 +837,15 @@ static int __init vfp_init(void)
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if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3)
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if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3)
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elf_hwcap |= HWCAP_FPHP;
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elf_hwcap |= HWCAP_FPHP;
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}
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}
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/*
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* Check for the presence of Advanced SIMD Dot Product
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* instructions.
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*/
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isar6 = read_cpuid_ext(CPUID_EXT_ISAR6);
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if (cpuid_feature_extract_field(isar6, 4) == 0x1)
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elf_hwcap |= HWCAP_ASIMDDP;
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/* Extract the architecture version on pre-cpuid scheme */
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/* Extract the architecture version on pre-cpuid scheme */
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} else {
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} else {
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if (vfpsid & FPSID_NODOUBLE) {
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if (vfpsid & FPSID_NODOUBLE) {
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