linux-kernel - [PATCH v2 3/5] x86/platform/uv: Add sysfs hubless leaves

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Date:   Fri, 27 Nov 2020 21:42:25 -0600
From:   Mike Travis <mike.travis@....com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Justin Ernst <justin.ernst@....com>,
        Mark Gross <mgross@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Steve Wahl <steve.wahl@....com>
Cc:     Mike Travis <mike.travis@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH v2 3/5] x86/platform/uv: Add sysfs hubless leaves

Add uv_sysfs hubless leaves for UV hubless systems.

Signed-off-by: Mike Travis <mike.travis@....com>
Reviewed-by: Steve Wahl <steve.wahl@....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 115754cdcd89..913559797ba4 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";
 }
@@ -747,6 +749,12 @@ 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 coherence_id_attr =
@@ -757,6 +765,8 @@ 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,
@@ -804,11 +814,36 @@ 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();
@@ -819,6 +854,10 @@ 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");
@@ -856,10 +895,19 @@ 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