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UPSTREAM: ARM: 9269/1: vfp: Add hwcap for FEAT_DotProd

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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>

Bug: 282663915
(cherry picked from commit 62ea0d873a)
Change-Id: I27cd1e060ec48ec3302c23b566ef9f50f7dc384e
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
This commit is contained in:
Amit Daniel Kachhap
2022-11-17 06:32:56 +01:00
committed by Todd Kjos
parent 49c6c1e40f
commit 33d2a21b81
3 changed files with 12 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/include/uapi/asm/hwcap.h
View File

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

1
arch/arm/kernel/setup.c
View File

@@ -1250,6 +1250,7 @@ static const char *hwcap_str[] = {
"evtstrm",
"fphp",
"asimdhp",
"asimddp",
NULL
};

10
arch/arm/vfp/vfpmodule.c
View File

@@ -774,6 +774,7 @@ static int __init vfp_init(void)
{
unsigned int vfpsid;
unsigned int cpu_arch = cpu_architecture();
unsigned int isar6;
/*
* 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)
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 */
} else {
if (vfpsid & FPSID_NODOUBLE) {