linux-kernel - [PATCH v4 1/6] s390/boot/uv.c: Use a constant for more-data rc

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Message-ID: <20241018091516.2167885-2-seiden@linux.ibm.com>
Date: Fri, 18 Oct 2024 11:15:11 +0200
From: Steffen Eiden <seiden@...ux.ibm.com>
To: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc: Ingo Franzki <ifranzki@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Christoph Schlameuss <schlameuss@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Subject: [PATCH v4 1/6] s390/boot/uv.c: Use a constant for more-data rc

Add a define for the UVC rc 0x0100 that indicates that a UV-call was
successful but may serve more data if called with a larger buffer
again.

Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@...ux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>
---
 arch/s390/boot/uv.c        | 4 ++--
 arch/s390/include/asm/uv.h | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/boot/uv.c b/arch/s390/boot/uv.c
index 318e6ba95bfd..2a71e759dc42 100644
--- a/arch/s390/boot/uv.c
+++ b/arch/s390/boot/uv.c
@@ -22,8 +22,8 @@ void uv_query_info(void)
 	if (!test_facility(158))
 		return;
 
-	/* rc==0x100 means that there is additional data we do not process */
-	if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
+	/* Ignore that there might be more data we do not process */
+	if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != UVC_RC_MORE_DATA)
 		return;
 
 	if (IS_ENABLED(CONFIG_KVM)) {
diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
index 153d93468b77..94ff58336e8e 100644
--- a/arch/s390/include/asm/uv.h
+++ b/arch/s390/include/asm/uv.h
@@ -28,6 +28,7 @@
 #define UVC_RC_INV_STATE	0x0003
 #define UVC_RC_INV_LEN		0x0005
 #define UVC_RC_NO_RESUME	0x0007
+#define UVC_RC_MORE_DATA	0x0100
 #define UVC_RC_NEED_DESTROY	0x8000
 
 #define UVC_CMD_QUI			0x0001
-- 
2.45.2