[PATCH 3/5] x86/platform/uv: Add sysfs hubless leaves

[Mike Travis]

Add uv_sysfs hubless leaves for UV hubless systems.

Signed-off-by: Mike Travis <mike.tra...@hpe.com>
Reviewed-by: Steve Wahl <steve.w...@hpe.com>
---
 drivers/platform/x86/uv_sysfs.c | 52 +++++++++++++++++++++++++++++++--
 1 file changed, 50 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/uv_sysfs.c b/drivers/platform/x86/uv_sysfs.c
index 6729ea8b63d2..5aa1addf3598 100644
--- a/drivers/platform/x86/uv_sysfs.c
+++ b/drivers/platform/x86/uv_sysfs.c
@@ -44,6 +44,8 @@ static const char *uv_type_string(void)
                return "5.0";
        else if (is_uv2_hub())
                return "3.0";
+       else if (uv_get_hubless_system())
+               return "0.1";
        else
                return "unknown";
 }
@@ -741,6 +743,12 @@ static ssize_t uv_hub_type_show(struct kobject *kobj,
        return scnprintf(buf, PAGE_SIZE, "0x%x\n", uv_hub_type());
 }
 
+static ssize_t uv_hubless_show(struct kobject *kobj,
+                       struct kobj_attribute *attr, char *buf)
+{
+       return scnprintf(buf, PAGE_SIZE, "0x%x\n", uv_get_hubless_system());
+}
+
 static struct kobj_attribute partition_id_attr =
        __ATTR(partition_id, 0444, partition_id_show, NULL);
 static struct kobj_attribute uv_type_attr =
@@ -749,6 +757,8 @@ static struct kobj_attribute uv_archtype_attr =
        __ATTR(archtype, 0444, uv_archtype_show, NULL);
 static struct kobj_attribute uv_hub_type_attr =
        __ATTR(hub_type, 0444, uv_hub_type_show, NULL);
+static struct kobj_attribute uv_hubless_attr =
+       __ATTR(hubless, 0444, uv_hubless_show, NULL);
 
 static struct attribute *base_attrs[] = {
        &partition_id_attr.attr,
@@ -795,11 +805,36 @@ static int initial_bios_setup(void)
        return 0;
 }
 
+static struct attribute *hubless_base_attrs[] = {
+       &partition_id_attr.attr,
+       &uv_type_attr.attr,
+       &uv_archtype_attr.attr,
+       &uv_hubless_attr.attr,
+       NULL,
+};
+
+static struct attribute_group hubless_base_attr_group = {
+       .attrs = hubless_base_attrs
+};
+
+
+static int __init uv_sysfs_hubless_init(void)
+{
+       int ret;
+
+       ret = sysfs_create_group(sgi_uv_kobj, &hubless_base_attr_group);
+       if (ret) {
+               pr_warn("sysfs_create_group hubless_base_attr_group failed\n");
+               kobject_put(sgi_uv_kobj);
+       }
+       return ret;
+}
+
 static int __init uv_sysfs_init(void)
 {
        int ret = 0;
 
-       if (!is_uv_system())
+       if (!is_uv_system() && !uv_get_hubless_system())
                return -ENODEV;
 
        num_cnodes = uv_num_possible_blades();
@@ -810,6 +845,10 @@ static int __init uv_sysfs_init(void)
                pr_warn("kobject_create_and_add sgi_uv failed\n");
                return -EINVAL;
        }
+
+       if (uv_get_hubless_system())
+               return uv_sysfs_hubless_init();
+
        ret = sysfs_create_group(sgi_uv_kobj, &base_attr_group);
        if (ret) {
                pr_warn("sysfs_create_group base_attr_group failed\n");
@@ -847,10 +886,19 @@ static int __init uv_sysfs_init(void)
        return ret;
 }
 
+static void __exit uv_sysfs_hubless_exit(void)
+{
+       sysfs_remove_group(sgi_uv_kobj, &hubless_base_attr_group);
+       kobject_put(sgi_uv_kobj);
+}
+
 static void __exit uv_sysfs_exit(void)
 {
-       if (!is_uv_system())
+       if (!is_uv_system()) {
+               if (uv_get_hubless_system())
+                       uv_sysfs_hubless_exit();
                return;
+       }
 
        pci_topology_exit();
        uv_ports_exit();
-- 
2.21.0