diff options
| author |   Heiko Carstens <hca@linux.ibm.com> | 2022-07-13 14:56:42 +0200 |
|---|---|---|
| committer |   Alexander Gordeev <agordeev@linux.ibm.com> | 2022-07-19 16:18:49 +0200 |
| commit | 0a5f9b382c6131381f9f2ed64ae6fdd994328d0d (patch) | |
| tree | 10975615394744fcc4d89dccf0ccd7bb314fe403 /arch/s390/include | |
| parent | MAINTAINERS: pick up all vfio_ap docs for VFIO AP maintainers (diff) | |
| download | linux-dev-0a5f9b382c6131381f9f2ed64ae6fdd994328d0d.tar.xz linux-dev-0a5f9b382c6131381f9f2ed64ae6fdd994328d0d.zip | |
s390/cpufeature: rework to allow more than only hwcap bits
Rework cpufeature implementation to allow for various cpu feature
indications, which is not only limited to hwcap bits. This is achieved
by adding a sequential list of cpu feature numbers, where each of them
is mapped to an entry which indicates what this number is about.
Each entry contains a type member, which indicates what feature
name space to look into (e.g. hwcap, or cpu facility). If wanted this
allows also to automatically load modules only in e.g. z/VM
configurations.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220713125644.16121-2-seiden@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cpufeature.h | 22 |
1 files changed, 7 insertions, 15 deletions
diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h index 14cfd48d598e..771caf5281e5 100644 --- a/arch/s390/include/asm/cpufeature.h +++ b/arch/s390/include/asm/cpufeature.h @@ -2,28 +2,20 @@ /* * Module interface for CPU features * - * Copyright IBM Corp. 2015 + * Copyright IBM Corp. 2015, 2022 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> */ #ifndef __ASM_S390_CPUFEATURE_H #define __ASM_S390_CPUFEATURE_H -#include <asm/elf.h> +enum { + S390_CPU_FEATURE_MSA, + S390_CPU_FEATURE_VXRS, + MAX_CPU_FEATURES +}; -/* Hardware features on Linux on z Systems are indicated by facility bits that - * are mapped to the so-called machine flags. Particular machine flags are - * then used to define ELF hardware capabilities; most notably hardware flags - * that are essential for user space / glibc. - * - * Restrict the set of exposed CPU features to ELF hardware capabilities for - * now. Additional machine flags can be indicated by values larger than - * MAX_ELF_HWCAP_FEATURES. - */ -#define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap)) -#define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES - -#define cpu_feature(feat) ilog2(HWCAP_ ## feat) +#define cpu_feature(feature) (feature) int cpu_have_feature(unsigned int nr); |