text: /* mdesc.c: Sun4V machine description handling.
   *
   * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
   */
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/lmb.h>
  #include <linux/log2.h>
  #include <linux/list.h>
  #include <linux/slab.h>
  #include <linux/mm.h>
  #include <linux/miscdevice.h>
  #include <linux/bootmem.h>
  
  #include <asm/cpudata.h>
  #include <asm/hypervisor.h>
  #include <asm/mdesc.h>
  #include <asm/prom.h>
  #include <asm/oplib.h>
  #include <asm/smp.h>
  
  /* Unlike the OBP device tree, the machine description is a full-on
   * DAG.  An arbitrary number of ARCs are possible from one
   * node to other nodes and thus we can't use the OBP device_node
   * data structure to represent these nodes inside of the kernel.
   *
   * Actually, it isn't even a DAG, because there are back pointers
   * which create cycles in the graph.
   *
   * mdesc_hdr and mdesc_elem describe the layout of the data structure
   * we get from the Hypervisor.
   */
  struct mdesc_hdr {
  	u32	version; /* Transport version */
  	u32	node_sz; /* node block size */
  	u32	name_sz; /* name block size */
  	u32	data_sz; /* data block size */
  } __attribute__((aligned(16)));
  
  struct mdesc_elem {
  	u8	tag;
  #define MD_LIST_END	0x00
  #define MD_NODE		0x4e
  #define MD_NODE_END	0x45
  #define MD_NOOP		0x20
  #define MD_PROP_ARC	0x61
  #define MD_PROP_VAL	0x76
  #define MD_PROP_STR	0x73
  #define MD_PROP_DATA	0x64
  	u8	name_len;
  	u16	resv;
  	u32	name_offset;
  	union {
  		struct {
  			u32	data_len;
  			u32	data_offset;
  		} data;
  		u64	val;
  	} d;
  };
  
  struct mdesc_mem_ops {
  	struct mdesc_handle *(*alloc)(unsigned int mdesc_size);
  	void (*free)(struct mdesc_handle *handle);
  };
  
  struct mdesc_handle {
  	struct list_head	list;
  	struct mdesc_mem_ops	*mops;
  	void			*self_base;
  	atomic_t		refcnt;
  	unsigned int		handle_size;
  	struct mdesc_hdr	mdesc;
  };
  
  static void mdesc_handle_init(struct mdesc_handle *hp,
  			      unsigned int handle_size,
  			      void *base)
  {
  	BUG_ON(((unsigned long)&hp->mdesc) & (16UL - 1));
  
  	memset(hp, 0, handle_size);
  	INIT_LIST_HEAD(&hp->list);
  	hp->self_base = base;
  	atomic_set(&hp->refcnt, 1);
  	hp->handle_size = handle_size;
  }
  
  static struct mdesc_handle * __init mdesc_lmb_alloc(unsigned int mdesc_size)
  {
  	unsigned int handle_size, alloc_size;
  	struct mdesc_handle *hp;
  	unsigned long paddr;
  
  	handle_size = (sizeof(struct mdesc_handle) -
  		       sizeof(struct mdesc_hdr) +
  		       mdesc_size);
  	alloc_size = PAGE_ALIGN(handle_size);
  
  	paddr = lmb_alloc(alloc_size, PAGE_SIZE);
  
  	hp = NULL;
  	if (paddr) {
  		hp = __va(paddr);
  		mdesc_handle_init(hp, handle_size, hp);
  	}
  	return hp;
  }
  
  static void mdesc_lmb_free(struct mdesc_handle *hp)
  {
  	unsigned int alloc_size;
  	unsigned long start;
  
  	BUG_ON(atomic_read(&hp->refcnt) != 0);
  	BUG_ON(!list_empty(&hp->list));
  
  	alloc_size = PAGE_ALIGN(hp->handle_size);
  	start = __pa(hp);
  	free_bootmem_late(start, alloc_size);
  }
  
  static struct mdesc_mem_ops lmb_mdesc_ops = {
  	.alloc = mdesc_lmb_alloc,
  	.free  = mdesc_lmb_free,
  };
  
  static struct mdesc_handle *mdesc_kmalloc(unsigned int mdesc_size)
  {
  	unsigned int handle_size;
  	void *base;
  
  	handle_size = (sizeof(struct mdesc_handle) -
  		       sizeof(struct mdesc_hdr) +
  		       mdesc_size);
  
  	base = kmalloc(handle_size + 15, GFP_KERNEL | __GFP_NOFAIL);
  	if (base) {
  		struct mdesc_handle *hp;
  		unsigned long addr;
  
  		addr = (unsigned long)base;
  		addr = (addr + 15UL) & ~15UL;
  		hp = (struct mdesc_handle *) addr;
  
  		mdesc_handle_init(hp, handle_size, base);
  		return hp;
  	}
  
  	return NULL;
  }
  
  static void mdesc_kfree(struct mdesc_handle *hp)
  {
  	BUG_ON(atomic_read(&hp->refcnt) != 0);
  	BUG_ON(!list_empty(&hp->list));
  
  	kfree(hp->self_base);
  }
  
  static struct mdesc_mem_ops kmalloc_mdesc_memops = {
  	.alloc = mdesc_kmalloc,
  	.free  = mdesc_kfree,
  };
  
  static struct mdesc_handle *mdesc_alloc(unsigned int mdesc_size,
  					struct mdesc_mem_ops *mops)
  {
  	struct mdesc_handle *hp = mops->alloc(mdesc_size);
  
  	if (hp)
  		hp->mops = mops;
  
  	return hp;
  }
  
  static void mdesc_free(struct mdesc_handle *hp)
  {
  	hp->mops->free(hp);
  }
  
  static struct mdesc_handle *cur_mdesc;
  static LIST_HEAD(mdesc_zombie_list);
  static DEFINE_SPINLOCK(mdesc_lock);
  
  struct mdesc_handle *mdesc_grab(void)
  {
  	struct mdesc_handle *hp;
  	unsigned long flags;
  
  	spin_lock_irqsave(&mdesc_lock, flags);
  	hp = cur_mdesc;
  	if (hp)
  		atomic_inc(&hp->refcnt);
  	spin_unlock_irqrestore(&mdesc_lock, flags);
  
  	return hp;
  }
  EXPORT_SYMBOL(mdesc_grab);
  
  void mdesc_release(struct mdesc_handle *hp)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&mdesc_lock, flags);
  	if (atomic_dec_and_test(&hp->refcnt)) {
  		list_del_init(&hp->list);
  		hp->mops->free(hp);
  	}
  	spin_unlock_irqrestore(&mdesc_lock, flags);
  }
  EXPORT_SYMBOL(mdesc_release);
  
  static DEFINE_MUTEX(mdesc_mutex);
  static struct mdesc_notifier_client *client_list;
  
  void mdesc_register_notifier(struct mdesc_notifier_client *client)
  {
  	u64 node;
  
  	mutex_lock(&mdesc_mutex);
  	client->next = client_list;
  	client_list = client;
  
  	mdesc_for_each_node_by_name(cur_mdesc, node, client->node_name)
  		client->add(cur_mdesc, node);
  
  	mutex_unlock(&mdesc_mutex);
  }
  
  static const u64 *parent_cfg_handle(struct mdesc_handle *hp, u64 node)
  {
  	const u64 *id;
  	u64 a;
  
  	id = NULL;
  	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
  		u64 target;
  
  		target = mdesc_arc_target(hp, a);
  		id = mdesc_get_property(hp, target,
  					"cfg-handle", NULL);
  		if (id)
  			break;
  	}
  
  	return id;
  }
  
  /* Run 'func' on nodes which are in A but not in B.  */
  static void invoke_on_missing(const char *name,
  			      struct mdesc_handle *a,
  			      struct mdesc_handle *b,
  			      void (*func)(struct mdesc_handle *, u64))
  {
  	u64 node;
  
  	mdesc_for_each_node_by_name(a, node, name) {
  		int found = 0, is_vdc_port = 0;
  		const char *name_prop;
  		const u64 *id;
  		u64 fnode;
  
  		name_prop = mdesc_get_property(a, node, "name", NULL);
  		if (name_prop && !strcmp(name_prop, "vdc-port")) {
  			is_vdc_port = 1;
  			id = parent_cfg_handle(a, node);
  		} else
  			id = mdesc_get_property(a, node, "id", NULL);
  
  		if (!id) {
  			printk(KERN_ERR "MD: Cannot find ID for %s node.\n",
  			       (name_prop ? name_prop : name));
  			continue;
  		}
  
  		mdesc_for_each_node_by_name(b, fnode, name) {
  			const u64 *fid;
  
  			if (is_vdc_port) {
  				name_prop = mdesc_get_property(b, fnode,
  							       "name", NULL);
  				if (!name_prop ||
  				    strcmp(name_prop, "vdc-port"))
  					continue;
  				fid = parent_cfg_handle(b, fnode);
  				if (!fid) {
  					printk(KERN_ERR "MD: Cannot find ID "
  					       "for vdc-port node.\n");
  					continue;
  				}
  			} else
  				fid = mdesc_get_property(b, fnode,
  							 "id", NULL);
  
  			if (*id == *fid) {
  				found = 1;
  				break;
  			}
  		}
  		if (!found)
  			func(a, node);
  	}
  }
  
  static void notify_one(struct mdesc_notifier_client *p,
  		       struct mdesc_handle *old_hp,
  		       struct mdesc_handle *new_hp)
  {
  	invoke_on_missing(p->node_name, old_hp, new_hp, p->remove);
  	invoke_on_missing(p->node_name, new_hp, old_hp, p->add);
  }
  
  static void mdesc_notify_clients(struct mdesc_handle *old_hp,
  				 struct mdesc_handle *new_hp)
  {
  	struct mdesc_notifier_client *p = client_list;
  
  	while (p) {
  		notify_one(p, old_hp, new_hp);
  		p = p->next;
  	}
  }
  
  void mdesc_update(void)
  {
  	unsigned long len, real_len, status;
  	struct mdesc_handle *hp, *orig_hp;
  	unsigned long flags;
  
  	mutex_lock(&mdesc_mutex);
  
  	(void) sun4v_mach_desc(0UL, 0UL, &len);
  
  	hp = mdesc_alloc(len, &kmalloc_mdesc_memops);
  	if (!hp) {
  		printk(KERN_ERR "MD: mdesc alloc fails\n");
  		goto out;
  	}
  
  	status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
  	if (status != HV_EOK || real_len > len) {
  		printk(KERN_ERR "MD: mdesc reread fails with %lu\n",
  		       status);
  		atomic_dec(&hp->refcnt);
  		mdesc_free(hp);
  		goto out;
  	}
  
  	spin_lock_irqsave(&mdesc_lock, flags);
  	orig_hp = cur_mdesc;
  	cur_mdesc = hp;
  	spin_unlock_irqrestore(&mdesc_lock, flags);
  
  	mdesc_notify_clients(orig_hp, hp);
  
  	spin_lock_irqsave(&mdesc_lock, flags);
  	if (atomic_dec_and_test(&orig_hp->refcnt))
  		mdesc_free(orig_hp);
  	else
  		list_add(&orig_hp->list, &mdesc_zombie_list);
  	spin_unlock_irqrestore(&mdesc_lock, flags);
  
  out:
  	mutex_unlock(&mdesc_mutex);
  }
  
  static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
  {
  	return (struct mdesc_elem *) (mdesc + 1);
  }
  
  static void *name_block(struct mdesc_hdr *mdesc)
  {
  	return ((void *) node_block(mdesc)) + mdesc->node_sz;
  }
  
  static void *data_block(struct mdesc_hdr *mdesc)
  {
  	return ((void *) name_block(mdesc)) + mdesc->name_sz;
  }
  
  u64 mdesc_node_by_name(struct mdesc_handle *hp,
  		       u64 from_node, const char *name)
  {
  	struct mdesc_elem *ep = node_block(&hp->mdesc);
  	const char *names = name_block(&hp->mdesc);
  	u64 last_node = hp->mdesc.node_sz / 16;
  	u64 ret;
  
  	if (from_node == MDESC_NODE_NULL) {
  		ret = from_node = 0;
  	} else if (from_node >= last_node) {
  		return MDESC_NODE_NULL;
  	} else {
  		ret = ep[from_node].d.val;
  	}
  
  	while (ret < last_node) {
  		if (ep[ret].tag != MD_NODE)
  			return MDESC_NODE_NULL;
  		if (!strcmp(names + ep[ret].name_offset, name))
  			break;
  		ret = ep[ret].d.val;
  	}
  	if (ret >= last_node)
  		ret = MDESC_NODE_NULL;
  	return ret;
  }
  EXPORT_SYMBOL(mdesc_node_by_name);
  
  const void *mdesc_get_property(struct mdesc_handle *hp, u64 node,
  			       const char *name, int *lenp)
  {
  	const char *names = name_block(&hp->mdesc);
  	u64 last_node = hp->mdesc.node_sz / 16;
  	void *data = data_block(&hp->mdesc);
  	struct mdesc_elem *ep;
  
  	if (node == MDESC_NODE_NULL || node >= last_node)
  		return NULL;
  
  	ep = node_block(&hp->mdesc) + node;
  	ep++;
  	for (; ep->tag != MD_NODE_END; ep++) {
  		void *val = NULL;
  		int len = 0;
  
  		switch (ep->tag) {
  		case MD_PROP_VAL:
  			val = &ep->d.val;
  			len = 8;
  			break;
  
  		case MD_PROP_STR:
  		case MD_PROP_DATA:
  			val = data + ep->d.data.data_offset;
  			len = ep->d.data.data_len;
  			break;
  
  		default:
  			break;
  		}
  		if (!val)
  			continue;
  
  		if (!strcmp(names + ep->name_offset, name)) {
  			if (lenp)
  				*lenp = len;
  			return val;
  		}
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL(mdesc_get_property);
  
  u64 mdesc_next_arc(struct mdesc_handle *hp, u64 from, const char *arc_type)
  {
  	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
  	const char *names = name_block(&hp->mdesc);
  	u64 last_node = hp->mdesc.node_sz / 16;
  
  	if (from == MDESC_NODE_NULL || from >= last_node)
  		return MDESC_NODE_NULL;
  
  	ep = base + from;
  
  	ep++;
  	for (; ep->tag != MD_NODE_END; ep++) {
  		if (ep->tag != MD_PROP_ARC)
  			continue;
  
  		if (strcmp(names + ep->name_offset, arc_type))
  			continue;
  
  		return ep - base;
  	}
  
  	return MDESC_NODE_NULL;
  }
  EXPORT_SYMBOL(mdesc_next_arc);
  
  u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc)
  {
  	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
  
  	ep = base + arc;
  
  	return ep->d.val;
  }
  EXPORT_SYMBOL(mdesc_arc_target);
  
  const char *mdesc_node_name(struct mdesc_handle *hp, u64 node)
  {
  	struct mdesc_elem *ep, *base = node_block(&hp->mdesc);
  	const char *names = name_block(&hp->mdesc);
  	u64 last_node = hp->mdesc.node_sz / 16;
  
  	if (node == MDESC_NODE_NULL || node >= last_node)
  		return NULL;
  
  	ep = base + node;
  	if (ep->tag != MD_NODE)
  		return NULL;
  
  	return names + ep->name_offset;
  }
  EXPORT_SYMBOL(mdesc_node_name);
  
  static void __init report_platform_properties(void)
  {
  	struct mdesc_handle *hp = mdesc_grab();
  	u64 pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
  	const char *s;
  	const u64 *v;
  
  	if (pn == MDESC_NODE_NULL) {
  		prom_printf("No platform node in machine-description.\n");
  		prom_halt();
  	}
  
  	s = mdesc_get_property(hp, pn, "banner-name", NULL);
  	printk("PLATFORM: banner-name [%s]\n", s);
  	s = mdesc_get_property(hp, pn, "name", NULL);
  	printk("PLATFORM: name [%s]\n", s);
  
  	v = mdesc_get_property(hp, pn, "hostid", NULL);
  	if (v)
  		printk("PLATFORM: hostid [%08llx]\n", *v);
  	v = mdesc_get_property(hp, pn, "serial#", NULL);
  	if (v)
  		printk("PLATFORM: serial# [%08llx]\n", *v);
  	v = mdesc_get_property(hp, pn, "stick-frequency", NULL);
  	printk("PLATFORM: stick-frequency [%08llx]\n", *v);
  	v = mdesc_get_property(hp, pn, "mac-address", NULL);
  	if (v)
  		printk("PLATFORM: mac-address [%llx]\n", *v);
  	v = mdesc_get_property(hp, pn, "watchdog-resolution", NULL);
  	if (v)
  		printk("PLATFORM: watchdog-resolution [%llu ms]\n", *v);
  	v = mdesc_get_property(hp, pn, "watchdog-max-timeout", NULL);
  	if (v)
  		printk("PLATFORM: watchdog-max-timeout [%llu ms]\n", *v);
  	v = mdesc_get_property(hp, pn, "max-cpus", NULL);
  	if (v)
  		printk("PLATFORM: max-cpus [%llu]\n", *v);
  
  #ifdef CONFIG_SMP
  	{
  		int max_cpu, i;
  
  		if (v) {
  			max_cpu = *v;
  			if (max_cpu > NR_CPUS)
  				max_cpu = NR_CPUS;
  		} else {
  			max_cpu = NR_CPUS;
  		}
  		for (i = 0; i < max_cpu; i++)
  			set_cpu_possible(i, true);
  	}
  #endif
  
  	mdesc_release(hp);
  }
  
  static void __cpuinit fill_in_one_cache(cpuinfo_sparc *c,
  					struct mdesc_handle *hp,
  					u64 mp)
  {
  	const u64 *level = mdesc_get_property(hp, mp, "level", NULL);
  	const u64 *size = mdesc_get_property(hp, mp, "size", NULL);
  	const u64 *line_size = mdesc_get_property(hp, mp, "line-size", NULL);
  	const char *type;
  	int type_len;
  
  	type = mdesc_get_property(hp, mp, "type", &type_len);
  
  	switch (*level) {
  	case 1:
  		if (of_find_in_proplist(type, "instn", type_len)) {
  			c->icache_size = *size;
  			c->icache_line_size = *line_size;
  		} else if (of_find_in_proplist(type, "data", type_len)) {
  			c->dcache_size = *size;
  			c->dcache_line_size = *line_size;
  		}
  		break;
  
  	case 2:
  		c->ecache_size = *size;
  		c->ecache_line_size = *line_size;
  		break;
  
  	default:
  		break;
  	}
  
  	if (*level == 1) {
  		u64 a;
  
  		mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
  			u64 target = mdesc_arc_target(hp, a);
  			const char *name = mdesc_node_name(hp, target);
  
  			if (!strcmp(name, "cache"))
  				fill_in_one_cache(c, hp, target);
  		}
  	}
  }
  
  static void __cpuinit mark_core_ids(struct mdesc_handle *hp, u64 mp, int core_id)
  {
  	u64 a;
  
  	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
  		u64 t = mdesc_arc_target(hp, a);
  		const char *name;
  		const u64 *id;
  
  		name = mdesc_node_name(hp, t);
  		if (!strcmp(name, "cpu")) {
  			id = mdesc_get_property(hp, t, "id", NULL);
  			if (*id < NR_CPUS)
  				cpu_data(*id).core_id = core_id;
  		} else {
  			u64 j;
  
  			mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_BACK) {
  				u64 n = mdesc_arc_target(hp, j);
  				const char *n_name;
  
  				n_name = mdesc_node_name(hp, n);
  				if (strcmp(n_name, "cpu"))
  					continue;
  
  				id = mdesc_get_property(hp, n, "id", NULL);
  				if (*id < NR_CPUS)
  					cpu_data(*id).core_id = core_id;
  			}
  		}
  	}
  }
  
  static void __cpuinit set_core_ids(struct mdesc_handle *hp)
  {
  	int idx;
  	u64 mp;
  
  	idx = 1;
  	mdesc_for_each_node_by_name(hp, mp, "cache") {
  		const u64 *level;
  		const char *type;
  		int len;
  
  		level = mdesc_get_property(hp, mp, "level", NULL);
  		if (*level != 1)
  			continue;
  
  		type = mdesc_get_property(hp, mp, "type", &len);
  		if (!of_find_in_proplist(type, "instn", len))
  			continue;
  
  		mark_core_ids(hp, mp, idx);
  
  		idx++;
  	}
  }
  
  static void __cpuinit mark_proc_ids(struct mdesc_handle *hp, u64 mp, int proc_id)
  {
  	u64 a;
  
  	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
  		u64 t = mdesc_arc_target(hp, a);
  		const char *name;
  		const u64 *id;
  
  		name = mdesc_node_name(hp, t);
  		if (strcmp(name, "cpu"))
  			continue;
  
  		id = mdesc_get_property(hp, t, "id", NULL);
  		if (*id < NR_CPUS)
  			cpu_data(*id).proc_id = proc_id;
  	}
  }
  
  static void __cpuinit __set_proc_ids(struct mdesc_handle *hp, const char *exec_unit_name)
  {
  	int idx;
  	u64 mp;
  
  	idx = 0;
  	mdesc_for_each_node_by_name(hp, mp, exec_unit_name) {
  		const char *type;
  		int len;
  
  		type = mdesc_get_property(hp, mp, "type", &len);
  		if (!of_find_in_proplist(type, "int", len) &&
  		    !of_find_in_proplist(type, "integer", len))
  			continue;
  
  		mark_proc_ids(hp, mp, idx);
  
  		idx++;
  	}
  }
  
  static void __cpuinit set_proc_ids(struct mdesc_handle *hp)
  {
  	__set_proc_ids(hp, "exec_unit");
  	__set_proc_ids(hp, "exec-unit");
  }
  
  static void __cpuinit get_one_mondo_bits(const u64 *p, unsigned int *mask,
  					 unsigned char def)
  {
  	u64 val;
  
  	if (!p)
  		goto use_default;
  	val = *p;
  
  	if (!val || val >= 64)
  		goto use_default;
  
  	*mask = ((1U << val) * 64U) - 1U;
  	return;
  
  use_default:
  	*mask = ((1U << def) * 64U) - 1U;
  }
  
  static void __cpuinit get_mondo_data(struct mdesc_handle *hp, u64 mp,
  				     struct trap_per_cpu *tb)
  {
  	const u64 *val;
  
  	val = mdesc_get_property(hp, mp, "q-cpu-mondo-#bits", NULL);
  	get_one_mondo_bits(val, &tb->cpu_mondo_qmask, 7);
  
  	val = mdesc_get_property(hp, mp, "q-dev-mondo-#bits", NULL);
  	get_one_mondo_bits(val, &tb->dev_mondo_qmask, 7);
  
  	val = mdesc_get_property(hp, mp, "q-resumable-#bits", NULL);
  	get_one_mondo_bits(val, &tb->resum_qmask, 6);
  
  	val = mdesc_get_property(hp, mp, "q-nonresumable-#bits", NULL);
  	get_one_mondo_bits(val, &tb->nonresum_qmask, 2);
  }
  
  static void * __cpuinit mdesc_iterate_over_cpus(void *(*func)(struct mdesc_handle *, u64, int, void *), void *arg, cpumask_t *mask)
  {
  	struct mdesc_handle *hp = mdesc_grab();
  	void *ret = NULL;
  	u64 mp;
  
  	mdesc_for_each_node_by_name(hp, mp, "cpu") {
  		const u64 *id = mdesc_get_property(hp, mp, "id", NULL);
  		int cpuid = *id;
  
  #ifdef CONFIG_SMP
  		if (cpuid >= NR_CPUS) {
  			printk(KERN_WARNING "Ignoring CPU %d which is "
  			       ">= NR_CPUS (%d)\n",
  			       cpuid, NR_CPUS);
  			continue;
  		}
  		if (!cpu_isset(cpuid, *mask))
  			continue;
  #endif
  
  		ret = func(hp, mp, cpuid, arg);
  		if (ret)
  			goto out;
  	}
  out:
  	mdesc_release(hp);
  	return ret;
  }
  
  static void * __cpuinit record_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
  {
  	ncpus_probed++;
  #ifdef CONFIG_SMP
  	set_cpu_present(cpuid, true);
  #endif
  	return NULL;
  }
  
  void __cpuinit mdesc_populate_present_mask(cpumask_t *mask)
  {
  	if (tlb_type != hypervisor)
  		return;
  
  	ncpus_probed = 0;
  	mdesc_iterate_over_cpus(record_one_cpu, NULL, mask);
  }
  
  static void * __cpuinit fill_in_one_cpu(struct mdesc_handle *hp, u64 mp, int cpuid, void *arg)
  {
  	const u64 *cfreq = mdesc_get_property(hp, mp, "clock-frequency", NULL);
  	struct trap_per_cpu *tb;
  	cpuinfo_sparc *c;
  	u64 a;
  
  #ifndef CONFIG_SMP
  	/* On uniprocessor we only want the values for the
  	 * real physical cpu the kernel booted onto, however
  	 * cpu_data() only has one entry at index 0.
  	 */
  	if (cpuid != real_hard_smp_processor_id())
  		return NULL;
  	cpuid = 0;
  #endif
  
  	c = &cpu_data(cpuid);
  	c->clock_tick = *cfreq;
  
  	tb = &trap_block[cpuid];
  	get_mondo_data(hp, mp, tb);
  
  	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
  		u64 j, t = mdesc_arc_target(hp, a);
  		const char *t_name;
  
  		t_name = mdesc_node_name(hp, t);
  		if (!strcmp(t_name, "cache")) {
  			fill_in_one_cache(c, hp, t);
  			continue;
  		}
  
  		mdesc_for_each_arc(j, hp, t, MDESC_ARC_TYPE_FWD) {
  			u64 n = mdesc_arc_target(hp, j);
  			const char *n_name;
  
  			n_name = mdesc_node_name(hp, n);
  			if (!strcmp(n_name, "cache"))
  				fill_in_one_cache(c, hp, n);
  		}
  	}
  
  	c->core_id = 0;
  	c->proc_id = -1;
  
  	return NULL;
  }
  
  void __cpuinit mdesc_fill_in_cpu_data(cpumask_t *mask)
  {
  	struct mdesc_handle *hp;
  
  	mdesc_iterate_over_cpus(fill_in_one_cpu, NULL, mask);
  
  #ifdef CONFIG_SMP
  	sparc64_multi_core = 1;
  #endif
  
  	hp = mdesc_grab();
  
  	set_core_ids(hp);
  	set_proc_ids(hp);
  
  	mdesc_release(hp);
  
  	smp_fill_in_sib_core_maps();
  }
  
  static ssize_t mdesc_read(struct file *file, char __user *buf,
  			  size_t len, loff_t *offp)
  {
  	struct mdesc_handle *hp = mdesc_grab();
  	int err;
  
  	if (!hp)
  		return -ENODEV;
  
  	err = hp->handle_size;
  	if (len < hp->handle_size)
  		err = -EMSGSIZE;
  	else if (copy_to_user(buf, &hp->mdesc, hp->handle_size))
  		err = -EFAULT;
  	mdesc_release(hp);
  
  	return err;
  }
  
  static const struct file_operations mdesc_fops = {
  	.read	= mdesc_read,
  	.owner	= THIS_MODULE,
  };
  
  static struct miscdevice mdesc_misc = {
  	.minor	= MISC_DYNAMIC_MINOR,
  	.name	= "mdesc",
  	.fops	= &mdesc_fops,
  };
  
  static int __init mdesc_misc_init(void)
  {
  	return misc_register(&mdesc_misc);
  }
  
  __initcall(mdesc_misc_init);
  
  void __init sun4v_mdesc_init(void)
  {
  	struct mdesc_handle *hp;
  	unsigned long len, real_len, status;
  
  	(void) sun4v_mach_desc(0UL, 0UL, &len);
  
  	printk("MDESC: Size is %lu bytes.\n", len);
  
  	hp = mdesc_alloc(len, &lmb_mdesc_ops);
  	if (hp == NULL) {
  		prom_printf("MDESC: alloc of %lu bytes failed.\n", len);
  		prom_halt();
  	}
  
  	status = sun4v_mach_desc(__pa(&hp->mdesc), len, &real_len);
  	if (status != HV_EOK || real_len > len) {
  		prom_printf("sun4v_mach_desc fails, err(%lu), "
  			    "len(%lu), real_len(%lu)\n",
  			    status, len, real_len);
  		mdesc_free(hp);
  		prom_halt();
  	}
  
  	cur_mdesc = hp;
  
  	report_platform_properties();
  }
  