[Qemu-devel] [PATCH v2 4/4] s390/kvm: Split out early console code.

[Cornelia Huck <cornelia.huck@de.ibm.com>]

This code is transport agnostic and can be used by both the legacy
virtio code and virtio_ccw.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 drivers/s390/kvm/Makefile       |  2 +-
 drivers/s390/kvm/early_printk.c | 42 +++++++++++++++++++++++++++++++++++++++++
 drivers/s390/kvm/kvm_virtio.c   | 29 ++--------------------------
 drivers/s390/kvm/virtio_ccw.c   |  1 -
 4 files changed, 45 insertions(+), 29 deletions(-)
 create mode 100644 drivers/s390/kvm/early_printk.c

diff --git a/drivers/s390/kvm/Makefile b/drivers/s390/kvm/Makefile
index 241891a..a3c8fc4 100644
--- a/drivers/s390/kvm/Makefile
+++ b/drivers/s390/kvm/Makefile
@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License (version 2 only)
 # as published by the Free Software Foundation.
 
-obj-$(CONFIG_S390_GUEST) += kvm_virtio.o virtio_ccw.o
+obj-$(CONFIG_S390_GUEST) += kvm_virtio.o early_printk.o virtio_ccw.o
diff --git a/drivers/s390/kvm/early_printk.c b/drivers/s390/kvm/early_printk.c
new file mode 100644
index 0000000..7831530
--- /dev/null
+++ b/drivers/s390/kvm/early_printk.c
@@ -0,0 +1,42 @@
+/*
+ * early_printk.c - code for early console output with virtio_console
+ * split off from kvm_virtio.c
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ *    Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/virtio_console.h>
+#include <asm/kvm_para.h>
+#include <asm/kvm_virtio.h>
+#include <asm/setup.h>
+#include <asm/sclp.h>
+
+static __init int early_put_chars(u32 vtermno, const char *buf, int count)
+{
+	char scratch[17];
+	unsigned int len = count;
+
+	if (len > sizeof(scratch) - 1)
+		len = sizeof(scratch) - 1;
+	scratch[len] = '\0';
+	memcpy(scratch, buf, len);
+	kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch));
+	return len;
+}
+
+static int __init s390_virtio_console_init(void)
+{
+	if (sclp_has_vt220() || sclp_has_linemode())
+		return -ENODEV;
+	return virtio_cons_early_init(early_put_chars);
+}
+console_initcall(s390_virtio_console_init);
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 76b95f3..6cdc66a 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -17,7 +17,6 @@
 #include <linux/virtio.h>
 #include <linux/virtio_config.h>
 #include <linux/slab.h>
-#include <linux/virtio_console.h>
 #include <linux/interrupt.h>
 #include <linux/virtio_ring.h>
 #include <linux/export.h>
@@ -25,9 +24,9 @@
 #include <asm/io.h>
 #include <asm/kvm_para.h>
 #include <asm/kvm_virtio.h>
-#include <asm/sclp.h>
 #include <asm/setup.h>
 #include <asm/irq.h>
+#include <asm/sclp.h>
 
 #define VIRTIO_SUBCODE_64 0x0D00
 
@@ -450,8 +449,7 @@ static int __init kvm_devices_init(void)
 		return -ENODEV;
 
 	if (test_devices_support(real_memory_size) < 0)
-		/* No error. */
-		return 0;
+		return -ENODEV;
 
 	rc = vmem_add_mapping(real_memory_size, PAGE_SIZE);
 	if (rc)
@@ -476,29 +474,6 @@ static int __init kvm_devices_init(void)
 	return 0;
 }
 
-/* code for early console output with virtio_console */
-static __init int early_put_chars(u32 vtermno, const char *buf, int count)
-{
-	char scratch[17];
-	unsigned int len = count;
-
-	if (len > sizeof(scratch) - 1)
-		len = sizeof(scratch) - 1;
-	scratch[len] = '\0';
-	memcpy(scratch, buf, len);
-	kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch));
-	return len;
-}
-
-static int __init s390_virtio_console_init(void)
-{
-	if (sclp_has_vt220() || sclp_has_linemode())
-		return -ENODEV;
-	return virtio_cons_early_init(early_put_chars);
-}
-console_initcall(s390_virtio_console_init);
-
-
 /*
  * We do this after core stuff, but before the drivers.
  */
diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c
index 1c9af22..14ae293 100644
--- a/drivers/s390/kvm/virtio_ccw.c
+++ b/drivers/s390/kvm/virtio_ccw.c
@@ -17,7 +17,6 @@
 #include <linux/virtio.h>
 #include <linux/virtio_config.h>
 #include <linux/slab.h>
-#include <linux/virtio_console.h>
 #include <linux/interrupt.h>
 #include <linux/virtio_ring.h>
 #include <linux/pfn.h>
-- 
1.7.11.5