linux-kernel - [PATCH 10/11] drivers/xen: Export vmcoreinfo through sysfs

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Message-Id: <1348769198-29580-11-git-send-email-daniel.kiper@oracle.com>
Date:	Thu, 27 Sep 2012 20:06:37 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	konrad.wilk@...cle.com, andrew.cooper3@...rix.com,
	jbeulich@...e.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com
Cc:	Daniel Kiper <daniel.kiper@...cle.com>
Subject: [PATCH 10/11] drivers/xen: Export vmcoreinfo through sysfs

Export vmcoreinfo through sysfs.

Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
---
 drivers/xen/sys-hypervisor.c |   42 +++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 41 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index fdb6d22..0111ad0 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -355,6 +355,41 @@ static void xen_properties_destroy(void)
 	sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
 }
 
+#ifdef CONFIG_KEXEC
+static ssize_t vmcoreinfo_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+	return sprintf(buffer, "%lx %lx\n", xen_vmcoreinfo_maddr,
+						xen_vmcoreinfo_max_size);
+}
+
+HYPERVISOR_ATTR_RO(vmcoreinfo);
+
+static int __init xen_vmcoreinfo_init(void)
+{
+	if (!xen_vmcoreinfo_max_size)
+		return 0;
+
+	return sysfs_create_file(hypervisor_kobj, &vmcoreinfo_attr.attr);
+}
+
+static void xen_vmcoreinfo_destroy(void)
+{
+	if (!xen_vmcoreinfo_max_size)
+		return;
+
+	sysfs_remove_file(hypervisor_kobj, &vmcoreinfo_attr.attr);
+}
+#else
+static int __init xen_vmcoreinfo_init(void)
+{
+	return 0;
+}
+
+static void xen_vmcoreinfo_destroy(void)
+{
+}
+#endif
+
 static int __init hyper_sysfs_init(void)
 {
 	int ret;
@@ -377,9 +412,14 @@ static int __init hyper_sysfs_init(void)
 	ret = xen_properties_init();
 	if (ret)
 		goto prop_out;
+	ret = xen_vmcoreinfo_init();
+	if (ret)
+		goto vmcoreinfo_out;
 
 	goto out;
 
+vmcoreinfo_out:
+	xen_properties_destroy();
 prop_out:
 	xen_sysfs_uuid_destroy();
 uuid_out:
@@ -394,12 +434,12 @@ out:
 
 static void __exit hyper_sysfs_exit(void)
 {
+	xen_vmcoreinfo_destroy();
 	xen_properties_destroy();
 	xen_compilation_destroy();
 	xen_sysfs_uuid_destroy();
 	xen_sysfs_version_destroy();
 	xen_sysfs_type_destroy();
-
 }
 module_init(hyper_sysfs_init);
 module_exit(hyper_sysfs_exit);
-- 
1.5.6.5

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