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>

diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h
index 771caf5..9312046 100644 (file)
--- a/arch/s390/include/asm/cpufeature.h
+++ b/arch/s390/include/asm/cpufeature.h
@@ -12,6 +12,7 @@
 enum {
        S390_CPU_FEATURE_MSA,
        S390_CPU_FEATURE_VXRS,
+       S390_CPU_FEATURE_UV,
        MAX_CPU_FEATURES
 };
 

diff --git a/arch/s390/kernel/cpufeature.c b/arch/s390/kernel/cpufeature.c
index 8b5072b..1b2ae42 100644 (file)
--- a/arch/s390/kernel/cpufeature.c
+++ b/arch/s390/kernel/cpufeature.c
@@ -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},
 };
 
 /*

diff --git a/drivers/s390/char/uvdevice.c b/drivers/s390/char/uvdevice.c
index 66505d7..1d40457 100644 (file)
--- a/drivers/s390/char/uvdevice.c
+++ b/drivers/s390/char/uvdevice.c
@@ -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");