Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright IBM Corp. 2022
|
|
*/
|
|
|
|
#include <linux/cpufeature.h>
|
|
#include <linux/export.h>
|
|
#include <linux/bug.h>
|
|
#include <asm/machine.h>
|
|
#include <asm/elf.h>
|
|
|
|
enum {
|
|
TYPE_HWCAP,
|
|
TYPE_FACILITY,
|
|
TYPE_MACHINE,
|
|
};
|
|
|
|
struct s390_cpu_feature {
|
|
unsigned int type : 4;
|
|
unsigned int num : 28;
|
|
};
|
|
|
|
static struct s390_cpu_feature s390_cpu_features[MAX_CPU_FEATURES] = {
|
|
[S390_CPU_FEATURE_MSA] = {.type = TYPE_HWCAP, .num = HWCAP_NR_MSA},
|
|
[S390_CPU_FEATURE_VXRS] = {.type = TYPE_HWCAP, .num = HWCAP_NR_VXRS},
|
|
[S390_CPU_FEATURE_UV] = {.type = TYPE_FACILITY, .num = 158},
|
|
[S390_CPU_FEATURE_D288] = {.type = TYPE_MACHINE, .num = MFEATURE_DIAG288},
|
|
};
|
|
|
|
/*
|
|
* cpu_have_feature - Test CPU features on module initialization
|
|
*/
|
|
int cpu_have_feature(unsigned int num)
|
|
{
|
|
struct s390_cpu_feature *feature;
|
|
|
|
if (WARN_ON_ONCE(num >= MAX_CPU_FEATURES))
|
|
return 0;
|
|
feature = &s390_cpu_features[num];
|
|
switch (feature->type) {
|
|
case TYPE_HWCAP:
|
|
return !!(elf_hwcap & BIT(feature->num));
|
|
case TYPE_FACILITY:
|
|
return test_facility(feature->num);
|
|
case TYPE_MACHINE:
|
|
return test_machine_feature(feature->num);
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(cpu_have_feature);
|