[PATCH v3 10/11] drivers/xen: Export vmcoreinfo through sysfs

Daniel Kiper
2012-12-27T02:20:31Z

Export vmcoreinfo through sysfs.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.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 96453f8..9dd290c 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -368,6 +368,41 @@ static void xen_properties_destroy(void)
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}

+#ifdef CONFIG_KEXEC_FIRMWARE
+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;
@@ -390,9 +425,14 @@ 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:
@@ -407,12 +447,12 @@ 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