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>
This commit is contained in:
Amit Daniel Kachhap 2022-11-17 06:32:56 +01:00 коммит произвёл Russell King (Oracle)
Родитель c00a19c8b1
Коммит 62ea0d873a
3 изменённых файлов: 12 добавлений и 0 удалений

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@ -30,6 +30,7 @@
#define HWCAP_EVTSTRM (1 << 21) #define HWCAP_EVTSTRM (1 << 21)
#define HWCAP_FPHP (1 << 22) #define HWCAP_FPHP (1 << 22)
#define HWCAP_ASIMDHP (1 << 23) #define HWCAP_ASIMDHP (1 << 23)
#define HWCAP_ASIMDDP (1 << 24)
/* /*
* HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2 * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2

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@ -1251,6 +1251,7 @@ static const char *hwcap_str[] = {
"evtstrm", "evtstrm",
"fphp", "fphp",
"asimdhp", "asimdhp",
"asimddp",
NULL NULL
}; };

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@ -774,6 +774,7 @@ static int __init vfp_init(void)
{ {
unsigned int vfpsid; unsigned int vfpsid;
unsigned int cpu_arch = cpu_architecture(); unsigned int cpu_arch = cpu_architecture();
unsigned int isar6;
/* /*
* Enable the access to the VFP on all online CPUs so the * Enable the access to the VFP on all online CPUs so the
@ -836,6 +837,15 @@ static int __init vfp_init(void)
if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3) if (((fmrx(MVFR1) & MVFR1_FPHP_MASK) >> MVFR1_FPHP_BIT) == 0x3)
elf_hwcap |= HWCAP_FPHP; elf_hwcap |= HWCAP_FPHP;
} }
/*
* Check for the presence of Advanced SIMD Dot Product
* instructions.
*/
isar6 = read_cpuid_ext(CPUID_EXT_ISAR6);
if (cpuid_feature_extract_field(isar6, 4) == 0x1)
elf_hwcap |= HWCAP_ASIMDDP;
/* Extract the architecture version on pre-cpuid scheme */ /* Extract the architecture version on pre-cpuid scheme */
} else { } else {
if (vfpsid & FPSID_NODOUBLE) { if (vfpsid & FPSID_NODOUBLE) {