linux/drivers/platform/x86/uv_sysfs.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * This file supports the /sys/firmware/sgi_uv topology tree on HPE UV.
 *
 *  Copyright (c) 2020 Hewlett Packard Enterprise.  All Rights Reserved.
 *  Copyright (c) Justin Ernst
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/kobject.h>
#include <asm/uv/bios.h>
#include <asm/uv/uv.h>
#include <asm/uv/uv_hub.h>
#include <asm/uv/uv_geo.h>

#define INVALID_CNODE -1

struct kobject *sgi_uv_kobj;
static struct kset *uv_pcibus_kset;
static struct kset *uv_hubs_kset;
static struct uv_bios_hub_info *hub_buf;
static struct uv_bios_port_info **port_buf;
static struct uv_hub **uv_hubs;
static struct uv_pci_top_obj **uv_pci_objs;
static int num_pci_lines;
static int num_cnodes;
static int *prev_obj_to_cnode;
static int uv_bios_obj_cnt;
static signed short uv_master_nasid = -1;
static void *uv_biosheap;

static const char *uv_type_string(void)
{
	if (is_uv5_hub())
		return "9.0";
	else if (is_uv4a_hub())
		return "7.1";
	else if (is_uv4_hub())
		return "7.0";
	else if (is_uv3_hub())
		return "5.0";
	else if (is_uv2_hub())
		return "3.0";
	else if (uv_get_hubless_system())
		return "0.1";
	else
		return "unknown";
}

static int ordinal_to_nasid(int ordinal)
{
	if (ordinal < num_cnodes && ordinal >= 0)
		return UV_PNODE_TO_NASID(uv_blade_to_pnode(ordinal));
	else
		return -1;
}

static union geoid_u cnode_to_geoid(int cnode)
{
	union geoid_u geoid;

	uv_bios_get_geoinfo(ordinal_to_nasid(cnode), (u64)sizeof(union geoid_u), (u64 *)&geoid);
	return geoid;
}

static int location_to_bpos(char *location, int *rack, int *slot, int *blade)
{
	char type, r, b, h;
	int idb, idh;

	if (sscanf(location, "%c%03d%c%02d%c%2d%c%d",
			 &r, rack, &type, slot, &b, &idb, &h, &idh) != 8)
		return -1;
	*blade = idb * 2 + idh;

	return 0;
}

static int cache_obj_to_cnode(struct uv_bios_hub_info *obj)
{
	int cnode;
	union geoid_u geoid;
	int obj_rack, obj_slot, obj_blade;
	int rack, slot, blade;

	if (!obj->f.fields.this_part && !obj->f.fields.is_shared)
		return 0;

	if (location_to_bpos(obj->location, &obj_rack, &obj_slot, &obj_blade))
		return -1;

	for (cnode = 0; cnode < num_cnodes; cnode++) {
		geoid = cnode_to_geoid(cnode);
		rack = geo_rack(geoid);
		slot = geo_slot(geoid);
		blade = geo_blade(geoid);
		if (obj_rack == rack && obj_slot == slot && obj_blade == blade)
			prev_obj_to_cnode[obj->id] = cnode;
	}

	return 0;
}

static int get_obj_to_cnode(int obj_id)
{
	return prev_obj_to_cnode[obj_id];
}

struct uv_hub {
	struct kobject kobj;
	struct uv_bios_hub_info *hub_info;
	struct uv_port **ports;
};

#define to_uv_hub(kobj_ptr) container_of(kobj_ptr, struct uv_hub, kobj)

static ssize_t hub_name_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	return sysfs_emit(buf, "%s\n", hub_info->name);
}

static ssize_t hub_location_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	return sysfs_emit(buf, "%s\n", hub_info->location);
}

static ssize_t hub_partition_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	return sprintf(buf, "%d\n", hub_info->f.fields.this_part);
}

static ssize_t hub_shared_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	return sprintf(buf, "%d\n", hub_info->f.fields.is_shared);
}
static ssize_t hub_nasid_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	int cnode = get_obj_to_cnode(hub_info->id);

	return sprintf(buf, "%d\n", ordinal_to_nasid(cnode));
}
static ssize_t hub_cnode_show(struct uv_bios_hub_info *hub_info, char *buf)
{
	return sprintf(buf, "%d\n", get_obj_to_cnode(hub_info->id));
}

struct hub_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct uv_bios_hub_info *hub_info, char *buf);
	ssize_t (*store)(struct uv_bios_hub_info *hub_info, const char *buf, size_t sz);
};

static struct hub_sysfs_entry name_attribute =
	__ATTR(name, 0444, hub_name_show, NULL);
static struct hub_sysfs_entry location_attribute =
	__ATTR(location, 0444, hub_location_show, NULL);
static struct hub_sysfs_entry partition_attribute =
	__ATTR(this_partition, 0444, hub_partition_show, NULL);
static struct hub_sysfs_entry shared_attribute =
	__ATTR(shared, 0444, hub_shared_show, NULL);
static struct hub_sysfs_entry nasid_attribute =
	__ATTR(nasid, 0444, hub_nasid_show, NULL);
static struct hub_sysfs_entry cnode_attribute =
	__ATTR(cnode, 0444, hub_cnode_show, NULL);

static struct attribute *uv_hub_attrs[] = {
	&name_attribute.attr,
	&location_attribute.attr,
	&partition_attribute.attr,
	&shared_attribute.attr,
	&nasid_attribute.attr,
	&cnode_attribute.attr,
	NULL,
};
ATTRIBUTE_GROUPS(uv_hub);

static void hub_release(struct kobject *kobj)
{
	struct uv_hub *hub = to_uv_hub(kobj);

	kfree(hub);
}

static ssize_t hub_type_show(struct kobject *kobj, struct attribute *attr,
				char *buf)
{
	struct uv_hub *hub = to_uv_hub(kobj);
	struct uv_bios_hub_info *bios_hub_info = hub->hub_info;
	struct hub_sysfs_entry *entry;

	entry = container_of(attr, struct hub_sysfs_entry, attr);

	if (!entry->show)
		return -EIO;

	return entry->show(bios_hub_info, buf);
}

static const struct sysfs_ops hub_sysfs_ops = {
	.show = hub_type_show,
};

static const struct kobj_type hub_attr_type = {
	.release	= hub_release,
	.sysfs_ops	= &hub_sysfs_ops,
	.default_groups	= uv_hub_groups,
};

static int uv_hubs_init(void)
{
	s64 biosr;
	u64 sz;
	int i, ret;

	prev_obj_to_cnode = kmalloc_array(uv_bios_obj_cnt, sizeof(*prev_obj_to_cnode),
					 GFP_KERNEL);
	if (!prev_obj_to_cnode)
		return -ENOMEM;

	for (i = 0; i < uv_bios_obj_cnt; i++)
		prev_obj_to_cnode[i] = INVALID_CNODE;

	uv_hubs_kset = kset_create_and_add("hubs", NULL, sgi_uv_kobj);
	if (!uv_hubs_kset) {
		ret = -ENOMEM;
		goto err_hubs_kset;
	}
	sz = uv_bios_obj_cnt * sizeof(*hub_buf);
	hub_buf = kzalloc(sz, GFP_KERNEL);
	if (!hub_buf) {
		ret = -ENOMEM;
		goto err_hub_buf;
	}

	biosr = uv_bios_enum_objs((u64)uv_master_nasid, sz, (u64 *)hub_buf);
	if (biosr) {
		ret = -EINVAL;
		goto err_enum_objs;
	}

	uv_hubs = kcalloc(uv_bios_obj_cnt, sizeof(*uv_hubs), GFP_KERNEL);
	if (!uv_hubs) {
		ret = -ENOMEM;
		goto err_enum_objs;
	}

	for (i = 0; i < uv_bios_obj_cnt; i++) {
		uv_hubs[i] = kzalloc(sizeof(*uv_hubs[i]), GFP_KERNEL);
		if (!uv_hubs[i]) {
			i--;
			ret = -ENOMEM;
			goto err_hubs;
		}

		uv_hubs[i]->hub_info = &hub_buf[i];
		cache_obj_to_cnode(uv_hubs[i]->hub_info);

		uv_hubs[i]->kobj.kset = uv_hubs_kset;

		ret = kobject_init_and_add(&uv_hubs[i]->kobj, &hub_attr_type,
					  NULL, "hub_%u", hub_buf[i].id);
		if (ret)
			goto err_hubs;
		kobject_uevent(&uv_hubs[i]->kobj, KOBJ_ADD);
	}
	return 0;

err_hubs:
	for (; i >= 0; i--)
		kobject_put(&uv_hubs[i]->kobj);
	kfree(uv_hubs);
err_enum_objs:
	kfree(hub_buf);
err_hub_buf:
	kset_unregister(uv_hubs_kset);
err_hubs_kset:
	kfree(prev_obj_to_cnode);
	return ret;

}

static void uv_hubs_exit(void)
{
	int i;

	for (i = 0; i < uv_bios_obj_cnt; i++)
		kobject_put(&uv_hubs[i]->kobj);

	kfree(uv_hubs);
	kfree(hub_buf);
	kset_unregister(uv_hubs_kset);
	kfree(prev_obj_to_cnode);
}

struct uv_port {
	struct kobject kobj;
	struct uv_bios_port_info *port_info;
};

#define to_uv_port(kobj_ptr) container_of(kobj_ptr, struct uv_port, kobj)

static ssize_t uv_port_conn_hub_show(struct uv_bios_port_info *port, char *buf)
{
	return sprintf(buf, "%d\n", port->conn_id);
}

static ssize_t uv_port_conn_port_show(struct uv_bios_port_info *port, char *buf)
{
	return sprintf(buf, "%d\n", port->conn_port);
}

struct uv_port_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct uv_bios_port_info *port_info, char *buf);
	ssize_t (*store)(struct uv_bios_port_info *port_info, const char *buf, size_t size);
};

static struct uv_port_sysfs_entry uv_port_conn_hub_attribute =
	__ATTR(conn_hub, 0444, uv_port_conn_hub_show, NULL);
static struct uv_port_sysfs_entry uv_port_conn_port_attribute =
	__ATTR(conn_port, 0444, uv_port_conn_port_show, NULL);

static struct attribute *uv_port_attrs[] = {
	&uv_port_conn_hub_attribute.attr,
	&uv_port_conn_port_attribute.attr,
	NULL,
};
ATTRIBUTE_GROUPS(uv_port);

static void uv_port_release(struct kobject *kobj)
{
	struct uv_port *port = to_uv_port(kobj);

	kfree(port);
}

static ssize_t uv_port_type_show(struct kobject *kobj, struct attribute *attr,
				char *buf)
{
	struct uv_port *port = to_uv_port(kobj);
	struct uv_bios_port_info *port_info = port->port_info;
	struct uv_port_sysfs_entry *entry;

	entry = container_of(attr, struct uv_port_sysfs_entry, attr);

	if (!entry->show)
		return -EIO;

	return entry->show(port_info, buf);
}

static const struct sysfs_ops uv_port_sysfs_ops = {
	.show = uv_port_type_show,
};

static const struct kobj_type uv_port_attr_type = {
	.release	= uv_port_release,
	.sysfs_ops	= &uv_port_sysfs_ops,
	.default_groups	= uv_port_groups,
};

static int uv_ports_init(void)
{
	s64 biosr;
	int j = 0, k = 0, ret, sz;

	port_buf = kcalloc(uv_bios_obj_cnt, sizeof(*port_buf), GFP_KERNEL);
	if (!port_buf)
		return -ENOMEM;

	for (j = 0; j < uv_bios_obj_cnt; j++) {
		sz = hub_buf[j].ports * sizeof(*port_buf[j]);
		port_buf[j] = kzalloc(sz, GFP_KERNEL);
		if (!port_buf[j]) {
			ret = -ENOMEM;
			j--;
			goto err_port_info;
		}
		biosr = uv_bios_enum_ports((u64)uv_master_nasid, (u64)hub_buf[j].id, sz,
					(u64 *)port_buf[j]);
		if (biosr) {
			ret = -EINVAL;
			goto err_port_info;
		}
	}
	for (j = 0; j < uv_bios_obj_cnt; j++) {
		uv_hubs[j]->ports = kcalloc(hub_buf[j].ports,
					   sizeof(*uv_hubs[j]->ports), GFP_KERNEL);
		if (!uv_hubs[j]->ports) {
			ret = -ENOMEM;
			j--;
			goto err_ports;
		}
	}
	for (j = 0; j < uv_bios_obj_cnt; j++) {
		for (k = 0; k < hub_buf[j].ports; k++) {
			uv_hubs[j]->ports[k] = kzalloc(sizeof(*uv_hubs[j]->ports[k]), GFP_KERNEL);
			if (!uv_hubs[j]->ports[k]) {
				ret = -ENOMEM;
				k--;
				goto err_kobj_ports;
			}
			uv_hubs[j]->ports[k]->port_info = &port_buf[j][k];
			ret = kobject_init_and_add(&uv_hubs[j]->ports[k]->kobj, &uv_port_attr_type,
					&uv_hubs[j]->kobj, "port_%d", port_buf[j][k].port);
			if (ret)
				goto err_kobj_ports;
			kobject_uevent(&uv_hubs[j]->ports[k]->kobj, KOBJ_ADD);
		}
	}
	return 0;

err_kobj_ports:
	for (; j >= 0; j--) {
		for (; k >= 0; k--)
			kobject_put(&uv_hubs[j]->ports[k]->kobj);
		if (j > 0)
			k = hub_buf[j-1].ports - 1;
	}
	j = uv_bios_obj_cnt - 1;
err_ports:
	for (; j >= 0; j--)
		kfree(uv_hubs[j]->ports);
	j = uv_bios_obj_cnt - 1;
err_port_info:
	for (; j >= 0; j--)
		kfree(port_buf[j]);
	kfree(port_buf);
	return ret;
}

static void uv_ports_exit(void)
{
	int j, k;

	for (j = 0; j < uv_bios_obj_cnt; j++) {
		for (k = hub_buf[j].ports - 1; k >= 0; k--)
			kobject_put(&uv_hubs[j]->ports[k]->kobj);
	}
	for (j = 0; j < uv_bios_obj_cnt; j++) {
		kfree(uv_hubs[j]->ports);
		kfree(port_buf[j]);
	}
	kfree(port_buf);
}

struct uv_pci_top_obj {
	struct kobject kobj;
	char *type;
	char *location;
	int iio_stack;
	char *ppb_addr;
	int slot;
};

#define to_uv_pci_top_obj(kobj_ptr) container_of(kobj_ptr, struct uv_pci_top_obj, kobj)

static ssize_t uv_pci_type_show(struct uv_pci_top_obj *top_obj, char *buf)
{
	return sysfs_emit(buf, "%s\n", top_obj->type);
}

static ssize_t uv_pci_location_show(struct uv_pci_top_obj *top_obj, char *buf)
{
	return sysfs_emit(buf, "%s\n", top_obj->location);
}

static ssize_t uv_pci_iio_stack_show(struct uv_pci_top_obj *top_obj, char *buf)
{
	return sprintf(buf, "%d\n", top_obj->iio_stack);
}

static ssize_t uv_pci_ppb_addr_show(struct uv_pci_top_obj *top_obj, char *buf)
{
	return sysfs_emit(buf, "%s\n", top_obj->ppb_addr);
}

static ssize_t uv_pci_slot_show(struct uv_pci_top_obj *top_obj, char *buf)
{
	return sprintf(buf, "%d\n", top_obj->slot);
}

struct uv_pci_top_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct uv_pci_top_obj *top_obj, char *buf);
	ssize_t (*store)(struct uv_pci_top_obj *top_obj, const char *buf, size_t size);
};

static struct uv_pci_top_sysfs_entry uv_pci_type_attribute =
	__ATTR(type, 0444, uv_pci_type_show, NULL);
static struct uv_pci_top_sysfs_entry uv_pci_location_attribute =
	__ATTR(location, 0444, uv_pci_location_show, NULL);
static struct uv_pci_top_sysfs_entry uv_pci_iio_stack_attribute =
	__ATTR(iio_stack, 0444, uv_pci_iio_stack_show, NULL);
static struct uv_pci_top_sysfs_entry uv_pci_ppb_addr_attribute =
	__ATTR(ppb_addr, 0444, uv_pci_ppb_addr_show, NULL);
static struct uv_pci_top_sysfs_entry uv_pci_slot_attribute =
	__ATTR(slot, 0444, uv_pci_slot_show, NULL);

static void uv_pci_top_release(struct kobject *kobj)
{
	struct uv_pci_top_obj *top_obj = to_uv_pci_top_obj(kobj);

	kfree(top_obj->type);
	kfree(top_obj->location);
	kfree(top_obj->ppb_addr);
	kfree(top_obj);
}

static ssize_t pci_top_type_show(struct kobject *kobj,
			struct attribute *attr, char *buf)
{
	struct uv_pci_top_obj *top_obj = to_uv_pci_top_obj(kobj);
	struct uv_pci_top_sysfs_entry *entry;

	entry = container_of(attr, struct uv_pci_top_sysfs_entry, attr);

	if (!entry->show)
		return -EIO;

	return entry->show(top_obj, buf);
}

static const struct sysfs_ops uv_pci_top_sysfs_ops = {
	.show = pci_top_type_show,
};

static const struct kobj_type uv_pci_top_attr_type = {
	.release	= uv_pci_top_release,
	.sysfs_ops	= &uv_pci_top_sysfs_ops,
};

static int init_pci_top_obj(struct uv_pci_top_obj *top_obj, char *line)
{
	char *start;
	char type[11], location[14], ppb_addr[15];
	int str_cnt, ret;
	unsigned int tmp_match[2];

	// Minimum line length
	if (strlen(line) < 36)
		return -EINVAL;

	//Line must match format "pcibus %4x:%2x" to be valid
	str_cnt = sscanf(line, "pcibus %4x:%2x", &tmp_match[0], &tmp_match[1]);
	if (str_cnt < 2)
		return -EINVAL;

	/* Connect pcibus to segment:bus number with '_'
	 * to concatenate name tokens.
	 * pcibus 0000:00 ... -> pcibus_0000:00 ...
	 */
	line[6] = '_';

	/* Null terminate after the concatencated name tokens
	 * to produce kobj name string.
	 */
	line[14] = '\0';

	// Use start to index after name tokens string for remainder of line info.
	start = &line[15];

	top_obj->iio_stack = -1;
	top_obj->slot = -1;

	/* r001i01b00h0 BASE IO (IIO Stack 0)
	 * r001i01b00h1 PCIe IO (IIO Stack 1)
	 * r001i01b03h1 PCIe SLOT
	 * r001i01b00h0 NODE IO
	 * r001i01b00h0 Riser
	 * (IIO Stack #) may not be present.
	 */
	if (start[0] == 'r') {
		str_cnt = sscanf(start, "%13s %10[^(] %*s %*s %d)",
				location, type, &top_obj->iio_stack);
		if (str_cnt < 2)
			return -EINVAL;
		top_obj->type = kstrdup(type, GFP_KERNEL);
		if (!top_obj->type)
			return -ENOMEM;
		top_obj->location = kstrdup(location, GFP_KERNEL);
		if (!top_obj->location) {
			kfree(top_obj->type);
			return -ENOMEM;
		}
	}
	/* PPB at 0000:80:00.00 (slot 3)
	 * (slot #) may not be present.
	 */
	else if (start[0] == 'P') {
		str_cnt = sscanf(start, "%10s %*s %14s %*s %d)",
				type, ppb_addr, &top_obj->slot);
		if (str_cnt < 2)
			return -EINVAL;
		top_obj->type = kstrdup(type, GFP_KERNEL);
		if (!top_obj->type)
			return -ENOMEM;
		top_obj->ppb_addr = kstrdup(ppb_addr, GFP_KERNEL);
		if (!top_obj->ppb_addr) {
			kfree(top_obj->type);
			return -ENOMEM;
		}
	} else
		return -EINVAL;

	top_obj->kobj.kset = uv_pcibus_kset;

	ret = kobject_init_and_add(&top_obj->kobj, &uv_pci_top_attr_type, NULL, "%s", line);
	if (ret)
		goto err_add_sysfs;

	if (top_obj->type) {
		ret = sysfs_create_file(&top_obj->kobj, &uv_pci_type_attribute.attr);
		if (ret)
			goto err_add_sysfs;
	}
	if (top_obj->location) {
		ret = sysfs_create_file(&top_obj->kobj, &uv_pci_location_attribute.attr);
		if (ret)
			goto err_add_sysfs;
	}
	if (top_obj->iio_stack >= 0) {
		ret = sysfs_create_file(&top_obj->kobj, &uv_pci_iio_stack_attribute.attr);
		if (ret)
			goto err_add_sysfs;
	}
	if (top_obj->ppb_addr) {
		ret = sysfs_create_file(&top_obj->kobj, &uv_pci_ppb_addr_attribute.attr);
		if (ret)
			goto err_add_sysfs;
	}
	if (top_obj->slot >= 0) {
		ret = sysfs_create_file(&top_obj->kobj, &uv_pci_slot_attribute.attr);
		if (ret)
			goto err_add_sysfs;
	}

	kobject_uevent(&top_obj->kobj, KOBJ_ADD);
	return 0;

err_add_sysfs:
	kobject_put(&top_obj->kobj);
	return ret;
}

static int pci_topology_init(void)
{
	char *pci_top_str, *start, *found, *count;
	size_t sz;
	s64 biosr;
	int l = 0, k = 0;
	int len, ret;

	uv_pcibus_kset = kset_create_and_add("pcibuses", NULL, sgi_uv_kobj);
	if (!uv_pcibus_kset)
		return -ENOMEM;

	for (sz = PAGE_SIZE; sz < 16 * PAGE_SIZE; sz += PAGE_SIZE) {
		pci_top_str = kmalloc(sz, GFP_KERNEL);
		if (!pci_top_str) {
			ret = -ENOMEM;
			goto err_pci_top_str;
		}
		biosr = uv_bios_get_pci_topology((u64)sz, (u64 *)pci_top_str);
		if (biosr == BIOS_STATUS_SUCCESS) {
			len = strnlen(pci_top_str, sz);
			for (count = pci_top_str; count < pci_top_str + len; count++) {
				if (*count == '\n')
					l++;
			}
			num_pci_lines = l;

			uv_pci_objs = kcalloc(num_pci_lines,
					     sizeof(*uv_pci_objs), GFP_KERNEL);
			if (!uv_pci_objs) {
				kfree(pci_top_str);
				ret = -ENOMEM;
				goto err_pci_top_str;
			}
			start = pci_top_str;
			while ((found = strsep(&start, "\n")) != NULL) {
				uv_pci_objs[k] = kzalloc(sizeof(*uv_pci_objs[k]), GFP_KERNEL);
				if (!uv_pci_objs[k]) {
					ret = -ENOMEM;
					goto err_pci_obj;
				}
				ret = init_pci_top_obj(uv_pci_objs[k], found);
				if (ret)
					goto err_pci_obj;
				k++;
				if (k == num_pci_lines)
					break;
			}
		}
		kfree(pci_top_str);
		if (biosr == BIOS_STATUS_SUCCESS || biosr == BIOS_STATUS_UNIMPLEMENTED)
			break;
	}

	return 0;
err_pci_obj:
	k--;
	for (; k >= 0; k--)
		kobject_put(&uv_pci_objs[k]->kobj);
	kfree(uv_pci_objs);
	kfree(pci_top_str);
err_pci_top_str:
	kset_unregister(uv_pcibus_kset);
	return ret;
}

static void pci_topology_exit(void)
{
	int k;

	for (k = 0; k < num_pci_lines; k++)
		kobject_put(&uv_pci_objs[k]->kobj);
	kset_unregister(uv_pcibus_kset);
	kfree(uv_pci_objs);
}

static ssize_t partition_id_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%ld\n", sn_partition_id);
}

static ssize_t coherence_id_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return sprintf(buf, "%ld\n", sn_coherency_id);
}

static ssize_t uv_type_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "%s\n", uv_type_string());
}

static ssize_t uv_archtype_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return uv_get_archtype(buf, PAGE_SIZE);
}

static ssize_t uv_hub_type_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "0x%x\n", uv_hub_type());
}

static ssize_t uv_hubless_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "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 =
	__ATTR(coherence_id, 0444, coherence_id_show, NULL);
static struct kobj_attribute uv_type_attr =
	__ATTR(uv_type, 0444, uv_type_show, NULL);
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,
	&coherence_id_attr.attr,
	&uv_type_attr.attr,
	&uv_archtype_attr.attr,
	&uv_hub_type_attr.attr,
	NULL,
};

static const struct attribute_group base_attr_group = {
	.attrs = base_attrs
};

static int initial_bios_setup(void)
{
	u64 v;
	s64 biosr;

	biosr = uv_bios_get_master_nasid((u64)sizeof(uv_master_nasid), (u64 *)&uv_master_nasid);
	if (biosr)
		return -EINVAL;

	biosr = uv_bios_get_heapsize((u64)uv_master_nasid, (u64)sizeof(u64), &v);
	if (biosr)
		return -EINVAL;

	uv_biosheap = vmalloc(v);
	if (!uv_biosheap)
		return -ENOMEM;

	biosr = uv_bios_install_heap((u64)uv_master_nasid, v, (u64 *)uv_biosheap);
	if (biosr) {
		vfree(uv_biosheap);
		return -EINVAL;
	}

	biosr = uv_bios_obj_count((u64)uv_master_nasid, sizeof(u64), &v);
	if (biosr) {
		vfree(uv_biosheap);
		return -EINVAL;
	}
	uv_bios_obj_cnt = (int)v;

	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 const 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() && !uv_get_hubless_system())
		return -ENODEV;

	num_cnodes = uv_num_possible_blades();

	if (!sgi_uv_kobj)
		sgi_uv_kobj = kobject_create_and_add("sgi_uv", firmware_kobj);
	if (!sgi_uv_kobj) {
		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");
		goto err_create_group;
	}

	ret = initial_bios_setup();
	if (ret)
		goto err_bios_setup;

	ret = uv_hubs_init();
	if (ret)
		goto err_hubs_init;

	ret = uv_ports_init();
	if (ret)
		goto err_ports_init;

	ret = pci_topology_init();
	if (ret)
		goto err_pci_init;

	return 0;

err_pci_init:
	uv_ports_exit();
err_ports_init:
	uv_hubs_exit();
err_hubs_init:
	vfree(uv_biosheap);
err_bios_setup:
	sysfs_remove_group(sgi_uv_kobj, &base_attr_group);
err_create_group:
	kobject_put(sgi_uv_kobj);
	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 (uv_get_hubless_system())
			uv_sysfs_hubless_exit();
		return;
	}

	pci_topology_exit();
	uv_ports_exit();
	uv_hubs_exit();
	vfree(uv_biosheap);
	sysfs_remove_group(sgi_uv_kobj, &base_attr_group);
	kobject_put(sgi_uv_kobj);
}

#ifndef MODULE
device_initcall(uv_sysfs_init);
#else
module_init(uv_sysfs_init);
#endif
module_exit(uv_sysfs_exit);

MODULE_AUTHOR("Hewlett Packard Enterprise");
MODULE_LICENSE("GPL");