drivers/ieee1394/highlevel.c - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  * IEEE 1394 for Linux
  *
  * Copyright (C) 1999 Andreas E. Bombe
  *
  * This code is licensed under the GPL.  See the file COPYING in the root
  * directory of the kernel sources for details.
  *
  *
  * Contributions:
  *
  * Christian Toegel <christian.toegel@gmx.at>
  *        unregister address space
  *
  * Manfred Weihs <weihs@ict.tuwien.ac.at>
  *        unregister address space
  *
  */

 #include <linux/config.h>
 #include <linux/slab.h>
 #include <linux/list.h>

 #include "ieee1394.h"
 #include "ieee1394_types.h"
 #include "hosts.h"
 #include "ieee1394_core.h"
 #include "highlevel.h"


 struct hl_host_info {
 	struct list_head list;
 	struct hpsb_host *host;
 	size_t size;
 	unsigned long key;
 	void *data;
 };


 static LIST_HEAD(hl_drivers);
 static DECLARE_MUTEX(hl_drivers_lock);

 static LIST_HEAD(addr_space);
 static rwlock_t addr_space_lock = RW_LOCK_UNLOCKED;

 /* addr_space list will have zero and max already included as bounds */
 static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
 static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;


 /* Internal usage. Must be called with hl_drivers_lock held */
 static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
 					      struct hpsb_host *host)
 {
 	struct hl_host_info *hi;
 	struct list_head *lh;

 	list_for_each (lh, &hl->host_info_list) {
 		hi = list_entry(lh, struct hl_host_info, list);
 		if (hi->host == host)
 			return hi;
 	}

 	return NULL;
 }


 /* Returns a per host/driver data structure that was previously stored by
  * hpsb_create_hostinfo. */
 void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 {
 	struct hl_host_info *hi;
 	void *data = NULL;

 	read_lock(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	if (hi)
 		data = hi->data;
 	read_unlock(&hl_drivers_lock);

 	return data;
 }


 /* If size is zero, then the return here is only valid for error checking */
 void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 			   size_t data_size)
 {
 	struct hl_host_info *hi;
 	void *data;

 	read_lock(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	read_unlock(&hl_drivers_lock);
 	if (hi) {
 		HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already exists",
 			 hl->name);
 		return NULL;
 	}

 	hi = kmalloc(sizeof(*hi) + data_size, GFP_KERNEL);
 	if (!hi)
 		return NULL;

 	memset(hi, 0, sizeof(*hi) + data_size);

 	if (data_size) {
 		data = hi->data = hi + 1;
 		hi->size = data_size;
 	} else
 		data = hi;

 	hi->host = host;

 	write_lock_irq(&hl_drivers_lock);
 	list_add_tail(&hi->list, &hl->host_info_list);
 	write_unlock_irq(&hl_drivers_lock);

 	return data;
 }


 int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
 		      void *data)
 {
 	struct hl_host_info *hi;
 	int ret = -EINVAL;

 	write_lock_irq(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	if (hi) {
 		if (!hi->size && !hi->data) {
 			hi->data = data;
 			ret = 0;
 		} else
 			HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo already has data",
 				 hl->name);
 	} else
 		HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
 			 hl->name);
 	write_unlock_irq(&hl_drivers_lock);

 	return ret;
 }


 void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
 {
 	struct hl_host_info *hi;

 	write_lock_irq(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	if (hi) {
 		list_del(&hi->list);
 		kfree(hi);
 	}
 	write_unlock_irq(&hl_drivers_lock);

 	return;
 }


 void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host, unsigned long key)
 {
 	struct hl_host_info *hi;

 	write_lock(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	if (hi)
 		hi->key = key;
 	write_unlock(&hl_drivers_lock);

 	return;
 }


 unsigned long hpsb_get_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host)
 {
 	struct hl_host_info *hi;
 	unsigned long key = 0;

 	read_lock(&hl_drivers_lock);
 	hi = hl_get_hostinfo(hl, host);
 	if (hi)
 		key = hi->key;
 	read_unlock(&hl_drivers_lock);

 	return key;
 }


 void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
 {
 	struct list_head *lh;
 	struct hl_host_info *hi;
 	void *data = NULL;

 	read_lock(&hl_drivers_lock);
 	list_for_each (lh, &hl->host_info_list) {
 		hi = list_entry(lh, struct hl_host_info, list);
 		if (hi->key == key) {
 			data = hi->data;
 			break;
 		}
 	}
 	read_unlock(&hl_drivers_lock);

 	return data;
 }


 struct hpsb_highlevel *hpsb_register_highlevel(const char *name,
                                                struct hpsb_highlevel_ops *ops)
 {
         struct hpsb_highlevel *hl;
 	struct list_head *lh;

         hl = (struct hpsb_highlevel *)kmalloc(sizeof(struct hpsb_highlevel),
                                               GFP_KERNEL);
         if (hl == NULL) {
                 return NULL;
         }

         INIT_LIST_HEAD(&hl->hl_list);
         INIT_LIST_HEAD(&hl->addr_list);
 	INIT_LIST_HEAD(&hl->host_info_list);

         hl->name = name;
         hl->op = ops;

 	down(&hl_drivers_lock);
         list_add_tail(&hl->hl_list, &hl_drivers);
 	up(&hl_drivers_lock);

 	if (hl->op->add_host) {
 		down(&hpsb_hosts_lock);
 		list_for_each (lh, &hpsb_hosts) {
 			struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);
 			hl->op->add_host(host, hl);
 		}
 		up(&hpsb_hosts_lock);
 	}

         return hl;
 }

 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
 {
         struct list_head *lh, *next;
         struct hpsb_address_serve *as;

         if (hl == NULL) {
                 return;
         }

         write_lock_irq(&addr_space_lock);
 	list_for_each_safe (lh, next, &hl->addr_list) {
                 as = list_entry(lh, struct hpsb_address_serve, addr_list);
                 list_del(&as->as_list);
                 kfree(as);
         }
         write_unlock_irq(&addr_space_lock);

 	down(&hl_drivers_lock);
         list_del(&hl->hl_list);
 	up(&hl_drivers_lock);

         if (hl->op->remove_host) {
 		down(&hpsb_hosts_lock);
 		list_for_each(lh, &hpsb_hosts) {
 			struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);

 			hl->op->remove_host(host);
 			hpsb_destroy_hostinfo(hl, host);
 		}
 		up(&hpsb_hosts_lock);
 	}

         kfree(hl);
 }

 int hpsb_register_addrspace(struct hpsb_highlevel *hl,
                             struct hpsb_address_ops *ops, u64 start, u64 end)
 {
         struct hpsb_address_serve *as;
         struct list_head *entry;
         int retval = 0;
         unsigned long flags;

         if (((start|end) & 3) || (start >= end) || (end > 0x1000000000000ULL)) {
                 HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
                 return 0;
         }

         as = (struct hpsb_address_serve *)
                 kmalloc(sizeof(struct hpsb_address_serve), GFP_KERNEL);
         if (as == NULL) {
                 return 0;
         }

         INIT_LIST_HEAD(&as->as_list);
         INIT_LIST_HEAD(&as->addr_list);
         as->op = ops;
         as->start = start;
         as->end = end;

         write_lock_irqsave(&addr_space_lock, flags);
         entry = addr_space.next;

         while (list_entry(entry, struct hpsb_address_serve, as_list)->end <= start) {
                 if (list_entry(entry->next, struct hpsb_address_serve, as_list)->start >= end) {
                         list_add(&as->as_list, entry);
                         list_add_tail(&as->addr_list, &hl->addr_list);
                         retval = 1;
                         break;
                 }
                 entry = entry->next;
         }
         write_unlock_irqrestore(&addr_space_lock, flags);

         if (retval == 0) {
                 kfree(as);
         }

         return retval;
 }

 int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, u64 start)
 {
         int retval = 0;
         struct hpsb_address_serve *as;
         struct list_head *entry;
         unsigned long flags;

         write_lock_irqsave(&addr_space_lock, flags);

         entry = hl->addr_list.next;

         while (entry != &hl->addr_list) {
                 as = list_entry(entry, struct hpsb_address_serve, addr_list);
                 entry = entry->next;
                 if (as->start == start) {
                         list_del(&as->as_list);
                         list_del(&as->addr_list);
                         kfree(as);
                         retval = 1;
                         break;
                 }
         }

         write_unlock_irqrestore(&addr_space_lock, flags);

         return retval;
 }

 int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
                          unsigned int channel)
 {
         if (channel > 63) {
                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
                 return -EINVAL;
         }

         if (host->iso_listen_count[channel]++ == 0) {
                 return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
         }

 	return 0;
 }

 void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
                            unsigned int channel)
 {
         if (channel > 63) {
                 HPSB_ERR("%s called with invalid channel", __FUNCTION__);
                 return;
         }

         if (--host->iso_listen_count[channel] == 0) {
                 host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
         }
 }


 void highlevel_add_host(struct hpsb_host *host)
 {
         struct list_head *entry;
         struct hpsb_highlevel *hl;

 	down(&hl_drivers_lock);
         list_for_each(entry, &hl_drivers) {
                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);

 		if (hl->op->add_host)
 			hl->op->add_host(host, hl);
         }
         up(&hl_drivers_lock);
 }

 void highlevel_remove_host(struct hpsb_host *host)
 {
         struct list_head *entry;
         struct hpsb_highlevel *hl;

         down(&hl_drivers_lock);
 	list_for_each(entry, &hl_drivers) {
                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);

 		if (hl->op->remove_host) {
 			hl->op->remove_host(host);
 			hpsb_destroy_hostinfo(hl, host);
 		}
         }
         up(&hl_drivers_lock);
 }

 void highlevel_host_reset(struct hpsb_host *host)
 {
         struct list_head *entry;
         struct hpsb_highlevel *hl;

 	down(&hl_drivers_lock);
 	list_for_each(entry, &hl_drivers) {
                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);

                 if (hl->op->host_reset)
                         hl->op->host_reset(host);
         }
 	up(&hl_drivers_lock);
 }

 void highlevel_iso_receive(struct hpsb_host *host, void *data,
                            unsigned int length)
 {
         struct list_head *entry;
         struct hpsb_highlevel *hl;
         int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;

         down(&hl_drivers_lock);
 	list_for_each(entry, &hl_drivers) {
                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);

                 if (hl->op->iso_receive)
                         hl->op->iso_receive(host, channel, data, length);
         }
         up(&hl_drivers_lock);
 }

 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
                            void *data, unsigned int length)
 {
         struct list_head *entry;
         struct hpsb_highlevel *hl;
         int cts = ((quadlet_t *)data)[0] >> 4;

         down(&hl_drivers_lock);
 	list_for_each(entry, &hl_drivers) {
                 hl = list_entry(entry, struct hpsb_highlevel, hl_list);
                 if (hl->op->fcp_request)
                         hl->op->fcp_request(host, nodeid, direction, cts, data, length);
         }
         up(&hl_drivers_lock);
 }

 int highlevel_read(struct hpsb_host *host, int nodeid, void *data,
                    u64 addr, unsigned int length, u16 flags)
 {
         struct hpsb_address_serve *as;
         struct list_head *entry;
         unsigned int partlength;
         int rcode = RCODE_ADDRESS_ERROR;

         read_lock(&addr_space_lock);

         entry = addr_space.next;
         as = list_entry(entry, struct hpsb_address_serve, as_list);

         while (as->start <= addr) {
                 if (as->end > addr) {
                         partlength = min(as->end - addr, (u64) length);

                         if (as->op->read) {
                                 rcode = as->op->read(host, nodeid, data,
 						     addr, partlength, flags);
                         } else {
                                 rcode = RCODE_TYPE_ERROR;
                         }

 			(u8 *)data += partlength;
                         length -= partlength;
                         addr += partlength;

                         if ((rcode != RCODE_COMPLETE) || !length) {
                                 break;
                         }
                 }

                 entry = entry->next;
                 as = list_entry(entry, struct hpsb_address_serve, as_list);
         }

         read_unlock(&addr_space_lock);

         if (length && (rcode == RCODE_COMPLETE)) {
                 rcode = RCODE_ADDRESS_ERROR;
         }

         return rcode;
 }

 int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
 		    void *data, u64 addr, unsigned int length, u16 flags)
 {
         struct hpsb_address_serve *as;
         struct list_head *entry;
         unsigned int partlength;
         int rcode = RCODE_ADDRESS_ERROR;

         read_lock(&addr_space_lock);

         entry = addr_space.next;
         as = list_entry(entry, struct hpsb_address_serve, as_list);

         while (as->start <= addr) {
                 if (as->end > addr) {
                         partlength = min(as->end - addr, (u64) length);

                         if (as->op->write) {
                                 rcode = as->op->write(host, nodeid, destid,
 						      data, addr, partlength, flags);
                         } else {
                                 rcode = RCODE_TYPE_ERROR;
                         }

 			(u8 *)data += partlength;
                         length -= partlength;
                         addr += partlength;

                         if ((rcode != RCODE_COMPLETE) || !length) {
                                 break;
                         }
                 }

                 entry = entry->next;
                 as = list_entry(entry, struct hpsb_address_serve, as_list);
         }

         read_unlock(&addr_space_lock);

         if (length && (rcode == RCODE_COMPLETE)) {
                 rcode = RCODE_ADDRESS_ERROR;
         }

         return rcode;
 }


 int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
                    u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags)
 {
         struct hpsb_address_serve *as;
         struct list_head *entry;
         int rcode = RCODE_ADDRESS_ERROR;

         read_lock(&addr_space_lock);

         entry = addr_space.next;
         as = list_entry(entry, struct hpsb_address_serve, as_list);

         while (as->start <= addr) {
                 if (as->end > addr) {
                         if (as->op->lock) {
                                 rcode = as->op->lock(host, nodeid, store, addr,
                                                      data, arg, ext_tcode, flags);
                         } else {
                                 rcode = RCODE_TYPE_ERROR;
                         }

                         break;
                 }

                 entry = entry->next;
                 as = list_entry(entry, struct hpsb_address_serve, as_list);
         }

         read_unlock(&addr_space_lock);

         return rcode;
 }

 int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
                      u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags)
 {
         struct hpsb_address_serve *as;
         struct list_head *entry;
         int rcode = RCODE_ADDRESS_ERROR;

         read_lock(&addr_space_lock);

         entry = addr_space.next;
         as = list_entry(entry, struct hpsb_address_serve, as_list);

         while (as->start <= addr) {
                 if (as->end > addr) {
                         if (as->op->lock64) {
                                 rcode = as->op->lock64(host, nodeid, store,
                                                        addr, data, arg,
                                                        ext_tcode, flags);
                         } else {
                                 rcode = RCODE_TYPE_ERROR;
                         }

                         break;
                 }

                 entry = entry->next;
                 as = list_entry(entry, struct hpsb_address_serve, as_list);
         }

         read_unlock(&addr_space_lock);

         return rcode;
 }

 void init_hpsb_highlevel(void)
 {
         INIT_LIST_HEAD(&dummy_zero_addr.as_list);
         INIT_LIST_HEAD(&dummy_zero_addr.addr_list);
         INIT_LIST_HEAD(&dummy_max_addr.as_list);
         INIT_LIST_HEAD(&dummy_max_addr.addr_list);

         dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;

         dummy_zero_addr.start = dummy_zero_addr.end = 0;
         dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;

         list_add_tail(&dummy_zero_addr.as_list, &addr_space);
         list_add_tail(&dummy_max_addr.as_list, &addr_space);
 }
	/*
	* IEEE 1394 for Linux
	*
	* Copyright (C) 1999 Andreas E. Bombe
	*
	* This code is licensed under the GPL. See the file COPYING in the root
	* directory of the kernel sources for details.
	*
	*
	* Contributions:
	*
	* Christian Toegel <christian.toegel@gmx.at>
	* unregister address space
	*
	* Manfred Weihs <weihs@ict.tuwien.ac.at>
	* unregister address space
	*
	*/

	#include <linux/config.h>
	#include <linux/slab.h>
	#include <linux/list.h>

	#include "ieee1394.h"
	#include "ieee1394_types.h"
	#include "hosts.h"
	#include "ieee1394_core.h"
	#include "highlevel.h"


	struct hl_host_info {
	struct list_head list;
	struct hpsb_host *host;
	size_t size;
	unsigned long key;
	void *data;
	};


	static LIST_HEAD(hl_drivers);
	static DECLARE_MUTEX(hl_drivers_lock);

	static LIST_HEAD(addr_space);
	static rwlock_t addr_space_lock = RW_LOCK_UNLOCKED;

	/* addr_space list will have zero and max already included as bounds */
	static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
	static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;


	/* Internal usage. Must be called with hl_drivers_lock held */
	static struct hl_host_info hl_get_hostinfo(struct hpsb_highlevel hl,
	struct hpsb_host *host)
	{
	struct hl_host_info *hi;
	struct list_head *lh;

	list_for_each (lh, &hl->host_info_list) {
	hi = list_entry(lh, struct hl_host_info, list);
	if (hi->host == host)
	return hi;
	}

	return NULL;
	}


	/* Returns a per host/driver data structure that was previously stored by
	* hpsb_create_hostinfo. */
	void hpsb_get_hostinfo(struct hpsb_highlevel hl, struct hpsb_host *host)
	{
	struct hl_host_info *hi;
	void *data = NULL;

	read_lock(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	if (hi)
	data = hi->data;
	read_unlock(&hl_drivers_lock);

	return data;
	}


	/* If size is zero, then the return here is only valid for error checking */
	void hpsb_create_hostinfo(struct hpsb_highlevel hl, struct hpsb_host *host,
	size_t data_size)
	{
	struct hl_host_info *hi;
	void *data;

	read_lock(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	read_unlock(&hl_drivers_lock);
	if (hi) {
	HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already exists",
	hl->name);
	return NULL;
	}

	hi = kmalloc(sizeof(*hi) + data_size, GFP_KERNEL);
	if (!hi)
	return NULL;

	memset(hi, 0, sizeof(*hi) + data_size);

	if (data_size) {
	data = hi->data = hi + 1;
	hi->size = data_size;
	} else
	data = hi;

	hi->host = host;

	write_lock_irq(&hl_drivers_lock);
	list_add_tail(&hi->list, &hl->host_info_list);
	write_unlock_irq(&hl_drivers_lock);

	return data;
	}


	int hpsb_set_hostinfo(struct hpsb_highlevel hl, struct hpsb_host host,
	void *data)
	{
	struct hl_host_info *hi;
	int ret = -EINVAL;

	write_lock_irq(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	if (hi) {
	if (!hi->size && !hi->data) {
	hi->data = data;
	ret = 0;
	} else
	HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo already has data",
	hl->name);
	} else
	HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
	hl->name);
	write_unlock_irq(&hl_drivers_lock);

	return ret;
	}


	void hpsb_destroy_hostinfo(struct hpsb_highlevel hl, struct hpsb_host host)
	{
	struct hl_host_info *hi;

	write_lock_irq(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	if (hi) {
	list_del(&hi->list);
	kfree(hi);
	}
	write_unlock_irq(&hl_drivers_lock);

	return;
	}


	void hpsb_set_hostinfo_key(struct hpsb_highlevel hl, struct hpsb_host host, unsigned long key)
	{
	struct hl_host_info *hi;

	write_lock(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	if (hi)
	hi->key = key;
	write_unlock(&hl_drivers_lock);

	return;
	}


	unsigned long hpsb_get_hostinfo_key(struct hpsb_highlevel hl, struct hpsb_host host)
	{
	struct hl_host_info *hi;
	unsigned long key = 0;

	read_lock(&hl_drivers_lock);
	hi = hl_get_hostinfo(hl, host);
	if (hi)
	key = hi->key;
	read_unlock(&hl_drivers_lock);

	return key;
	}


	void hpsb_get_hostinfo_bykey(struct hpsb_highlevel hl, unsigned long key)
	{
	struct list_head *lh;
	struct hl_host_info *hi;
	void *data = NULL;

	read_lock(&hl_drivers_lock);
	list_for_each (lh, &hl->host_info_list) {
	hi = list_entry(lh, struct hl_host_info, list);
	if (hi->key == key) {
	data = hi->data;
	break;
	}
	}
	read_unlock(&hl_drivers_lock);

	return data;
	}


	struct hpsb_highlevel hpsb_register_highlevel(const char name,
	struct hpsb_highlevel_ops *ops)
	{
	struct hpsb_highlevel *hl;
	struct list_head *lh;

	hl = (struct hpsb_highlevel *)kmalloc(sizeof(struct hpsb_highlevel),
	GFP_KERNEL);
	if (hl == NULL) {
	return NULL;
	}

	INIT_LIST_HEAD(&hl->hl_list);
	INIT_LIST_HEAD(&hl->addr_list);
	INIT_LIST_HEAD(&hl->host_info_list);

	hl->name = name;
	hl->op = ops;

	down(&hl_drivers_lock);
	list_add_tail(&hl->hl_list, &hl_drivers);
	up(&hl_drivers_lock);

	if (hl->op->add_host) {
	down(&hpsb_hosts_lock);
	list_for_each (lh, &hpsb_hosts) {
	struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);
	hl->op->add_host(host, hl);
	}
	up(&hpsb_hosts_lock);
	}

	return hl;
	}

	void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
	{
	struct list_head lh, next;
	struct hpsb_address_serve *as;

	if (hl == NULL) {
	return;
	}

	write_lock_irq(&addr_space_lock);
	list_for_each_safe (lh, next, &hl->addr_list) {
	as = list_entry(lh, struct hpsb_address_serve, addr_list);
	list_del(&as->as_list);
	kfree(as);
	}
	write_unlock_irq(&addr_space_lock);

	down(&hl_drivers_lock);
	list_del(&hl->hl_list);
	up(&hl_drivers_lock);

	if (hl->op->remove_host) {
	down(&hpsb_hosts_lock);
	list_for_each(lh, &hpsb_hosts) {
	struct hpsb_host *host = list_entry(lh, struct hpsb_host, host_list);

	hl->op->remove_host(host);
	hpsb_destroy_hostinfo(hl, host);
	}
	up(&hpsb_hosts_lock);
	}

	kfree(hl);
	}

	int hpsb_register_addrspace(struct hpsb_highlevel *hl,
	struct hpsb_address_ops *ops, u64 start, u64 end)
	{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int retval = 0;
	unsigned long flags;

	if (((start\|end) & 3) \|\| (start >= end) \|\| (end > 0x1000000000000ULL)) {
	HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
	return 0;
	}

	as = (struct hpsb_address_serve *)
	kmalloc(sizeof(struct hpsb_address_serve), GFP_KERNEL);
	if (as == NULL) {
	return 0;
	}

	INIT_LIST_HEAD(&as->as_list);
	INIT_LIST_HEAD(&as->addr_list);
	as->op = ops;
	as->start = start;
	as->end = end;

	write_lock_irqsave(&addr_space_lock, flags);
	entry = addr_space.next;

	while (list_entry(entry, struct hpsb_address_serve, as_list)->end <= start) {
	if (list_entry(entry->next, struct hpsb_address_serve, as_list)->start >= end) {
	list_add(&as->as_list, entry);
	list_add_tail(&as->addr_list, &hl->addr_list);
	retval = 1;
	break;
	}
	entry = entry->next;
	}
	write_unlock_irqrestore(&addr_space_lock, flags);

	if (retval == 0) {
	kfree(as);
	}

	return retval;
	}

	int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, u64 start)
	{
	int retval = 0;
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned long flags;

	write_lock_irqsave(&addr_space_lock, flags);

	entry = hl->addr_list.next;

	while (entry != &hl->addr_list) {
	as = list_entry(entry, struct hpsb_address_serve, addr_list);
	entry = entry->next;
	if (as->start == start) {
	list_del(&as->as_list);
	list_del(&as->addr_list);
	kfree(as);
	retval = 1;
	break;
	}
	}

	write_unlock_irqrestore(&addr_space_lock, flags);

	return retval;
	}

	int hpsb_listen_channel(struct hpsb_highlevel hl, struct hpsb_host host,
	unsigned int channel)
	{
	if (channel > 63) {
	HPSB_ERR("%s called with invalid channel", __FUNCTION__);
	return -EINVAL;
	}

	if (host->iso_listen_count[channel]++ == 0) {
	return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
	}

	return 0;
	}

	void hpsb_unlisten_channel(struct hpsb_highlevel hl, struct hpsb_host host,
	unsigned int channel)
	{
	if (channel > 63) {
	HPSB_ERR("%s called with invalid channel", __FUNCTION__);
	return;
	}

	if (--host->iso_listen_count[channel] == 0) {
	host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
	}
	}


	void highlevel_add_host(struct hpsb_host *host)
	{
	struct list_head *entry;
	struct hpsb_highlevel *hl;

	down(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
	hl = list_entry(entry, struct hpsb_highlevel, hl_list);

	if (hl->op->add_host)
	hl->op->add_host(host, hl);
	}
	up(&hl_drivers_lock);
	}

	void highlevel_remove_host(struct hpsb_host *host)
	{
	struct list_head *entry;
	struct hpsb_highlevel *hl;

	down(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
	hl = list_entry(entry, struct hpsb_highlevel, hl_list);

	if (hl->op->remove_host) {
	hl->op->remove_host(host);
	hpsb_destroy_hostinfo(hl, host);
	}
	}
	up(&hl_drivers_lock);
	}

	void highlevel_host_reset(struct hpsb_host *host)
	{
	struct list_head *entry;
	struct hpsb_highlevel *hl;

	down(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
	hl = list_entry(entry, struct hpsb_highlevel, hl_list);

	if (hl->op->host_reset)
	hl->op->host_reset(host);
	}
	up(&hl_drivers_lock);
	}

	void highlevel_iso_receive(struct hpsb_host host, void data,
	unsigned int length)
	{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;

	down(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
	hl = list_entry(entry, struct hpsb_highlevel, hl_list);

	if (hl->op->iso_receive)
	hl->op->iso_receive(host, channel, data, length);
	}
	up(&hl_drivers_lock);
	}

	void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
	void *data, unsigned int length)
	{
	struct list_head *entry;
	struct hpsb_highlevel *hl;
	int cts = ((quadlet_t *)data)[0] >> 4;

	down(&hl_drivers_lock);
	list_for_each(entry, &hl_drivers) {
	hl = list_entry(entry, struct hpsb_highlevel, hl_list);
	if (hl->op->fcp_request)
	hl->op->fcp_request(host, nodeid, direction, cts, data, length);
	}
	up(&hl_drivers_lock);
	}

	int highlevel_read(struct hpsb_host host, int nodeid, void data,
	u64 addr, unsigned int length, u16 flags)
	{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned int partlength;
	int rcode = RCODE_ADDRESS_ERROR;

	read_lock(&addr_space_lock);

	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);

	while (as->start <= addr) {
	if (as->end > addr) {
	partlength = min(as->end - addr, (u64) length);

	if (as->op->read) {
	rcode = as->op->read(host, nodeid, data,
	addr, partlength, flags);
	} else {
	rcode = RCODE_TYPE_ERROR;
	}

	(u8 *)data += partlength;
	length -= partlength;
	addr += partlength;

	if ((rcode != RCODE_COMPLETE) \|\| !length) {
	break;
	}
	}

	entry = entry->next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	}

	read_unlock(&addr_space_lock);

	if (length && (rcode == RCODE_COMPLETE)) {
	rcode = RCODE_ADDRESS_ERROR;
	}

	return rcode;
	}

	int highlevel_write(struct hpsb_host *host, int nodeid, int destid,
	void *data, u64 addr, unsigned int length, u16 flags)
	{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	unsigned int partlength;
	int rcode = RCODE_ADDRESS_ERROR;

	read_lock(&addr_space_lock);

	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);

	while (as->start <= addr) {
	if (as->end > addr) {
	partlength = min(as->end - addr, (u64) length);

	if (as->op->write) {
	rcode = as->op->write(host, nodeid, destid,
	data, addr, partlength, flags);
	} else {
	rcode = RCODE_TYPE_ERROR;
	}

	(u8 *)data += partlength;
	length -= partlength;
	addr += partlength;

	if ((rcode != RCODE_COMPLETE) \|\| !length) {
	break;
	}
	}

	entry = entry->next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	}

	read_unlock(&addr_space_lock);

	if (length && (rcode == RCODE_COMPLETE)) {
	rcode = RCODE_ADDRESS_ERROR;
	}

	return rcode;
	}


	int highlevel_lock(struct hpsb_host host, int nodeid, quadlet_t store,
	u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode, u16 flags)
	{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int rcode = RCODE_ADDRESS_ERROR;

	read_lock(&addr_space_lock);

	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);

	while (as->start <= addr) {
	if (as->end > addr) {
	if (as->op->lock) {
	rcode = as->op->lock(host, nodeid, store, addr,
	data, arg, ext_tcode, flags);
	} else {
	rcode = RCODE_TYPE_ERROR;
	}

	break;
	}

	entry = entry->next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	}

	read_unlock(&addr_space_lock);

	return rcode;
	}

	int highlevel_lock64(struct hpsb_host host, int nodeid, octlet_t store,
	u64 addr, octlet_t data, octlet_t arg, int ext_tcode, u16 flags)
	{
	struct hpsb_address_serve *as;
	struct list_head *entry;
	int rcode = RCODE_ADDRESS_ERROR;

	read_lock(&addr_space_lock);

	entry = addr_space.next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);

	while (as->start <= addr) {
	if (as->end > addr) {
	if (as->op->lock64) {
	rcode = as->op->lock64(host, nodeid, store,
	addr, data, arg,
	ext_tcode, flags);
	} else {
	rcode = RCODE_TYPE_ERROR;
	}

	break;
	}

	entry = entry->next;
	as = list_entry(entry, struct hpsb_address_serve, as_list);
	}

	read_unlock(&addr_space_lock);

	return rcode;
	}

	void init_hpsb_highlevel(void)
	{
	INIT_LIST_HEAD(&dummy_zero_addr.as_list);
	INIT_LIST_HEAD(&dummy_zero_addr.addr_list);
	INIT_LIST_HEAD(&dummy_max_addr.as_list);
	INIT_LIST_HEAD(&dummy_max_addr.addr_list);

	dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;

	dummy_zero_addr.start = dummy_zero_addr.end = 0;
	dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;

	list_add_tail(&dummy_zero_addr.as_list, &addr_space);
	list_add_tail(&dummy_max_addr.as_list, &addr_space);
	}