linux-kernel - [PATCH v2 3/3] s390/uvdevice: autoload module based on CPU facility

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Date:   Wed, 13 Jul 2022 14:56:44 +0200
From:   Steffen Eiden <seiden@...ux.ibm.com>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     nrb@...ux.ibm.com
Subject: [PATCH v2 3/3] 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@...ux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
---
 arch/s390/include/asm/cpufeature.h | 1 +
 arch/s390/kernel/cpufeature.c      | 1 +
 drivers/s390/char/uvdevice.c       | 5 ++---
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h
index 771caf5281e5..931204613753 100644
--- 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 170894730fcc..5c69be58a057 100644
--- a/arch/s390/kernel/cpufeature.c
+++ b/arch/s390/kernel/cpufeature.c
@@ -19,6 +19,7 @@ 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 66505d7166a6..1d40457c7b10 100644
--- 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");
-- 
2.35.3