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s390/uvdevice: autoload module based on CPU facility 

Make sure the uvdevice driver will be automatically loaded when
facility 158 is available.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220713125644.16121-4-seiden@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Steffen Eiden 2022-07-13 14:56:44 +02:00 committed by Alexander Gordeev
parent e2f39c9f54
commit 5fcd0d8ae2
3 changed files with 4 additions and 3 deletions
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1
arch/s390/include/asm/cpufeature.h
View File

@ -12,6 +12,7 @@
enum {
S390_CPU_FEATURE_MSA,
S390_CPU_FEATURE_VXRS,
S390_CPU_FEATURE_UV,
MAX_CPU_FEATURES
};

1
arch/s390/kernel/cpufeature.c
View File

@ -20,6 +20,7 @@ struct s390_cpu_feature {
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},
};
/*

5
drivers/s390/char/uvdevice.c
View File

@ -27,6 +27,7 @@
#include <linux/stddef.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/cpufeature.h>
#include <asm/uvdevice.h>
#include <asm/uv.h>
@ -244,12 +245,10 @@ static void __exit uvio_dev_exit(void)
static int __init uvio_dev_init(void)
{
if (!test_facility(158))
return -ENXIO;
return misc_register(&uvio_dev_miscdev);
}
module_init(uvio_dev_init);
module_cpu_feature_match(S390_CPU_FEATURE_UV, uvio_dev_init);
module_exit(uvio_dev_exit);
MODULE_AUTHOR("IBM Corporation");