highlevel.c

IEE1394 火线接口驱动 for linux

/*
 * 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 <[e-mail]>
 *        unregister address space
 *
 * Manfred Weihs <[e-mail]>
 *        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 rwlock_t hl_drivers_lock = RW_LOCK_UNLOCKED;

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;


static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
					      struct hpsb_host *host)
{
	struct hl_host_info *hi = NULL;
	struct list_head *lh;

	if (!hl || !host)
		return NULL;

	read_lock(&hl->host_info_lock);
	list_for_each (lh, &hl->host_info_list) {
		hi = list_entry(lh, struct hl_host_info, list);
		if (hi->host == host)
			break;
		hi = NULL;
	}
	read_unlock(&hl->host_info_lock);

	return hi;
}


/* 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 = hl_get_hostinfo(hl, host);

	if (hi)
		return hi->data;

	return NULL;
}


/* 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;
	unsigned long flags;

	hi = hl_get_hostinfo(hl, host);
	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_irqsave(&hl->host_info_lock, flags);
	list_add_tail(&hi->list, &hl->host_info_list);
	write_unlock_irqrestore(&hl->host_info_lock, flags);

	return data;
}


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

	hi = hl_get_hostinfo(hl, host);
	if (hi) {
		if (!hi->size && !hi->data) {
			hi->data = data;
			return 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);

	return -EINVAL;
}


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

	hi = hl_get_hostinfo(hl, host);
	if (hi) {
		unsigned long flags;
		write_lock_irqsave(&hl->host_info_lock, flags);
		list_del(&hi->list);
		write_unlock_irqrestore(&hl->host_info_lock, flags);
		kfree(hi);
	}

	return;
}


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

	hi = hl_get_hostinfo(hl, host);
	if (hi)
		hi->key = key;

	return;
}


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

	hi = hl_get_hostinfo(hl, host);
	if (hi)
		return hi->key;

	return 0;
}


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

	if (!hl)
		return NULL;

	read_lock(&hl->host_info_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->host_info_lock);

	return data;
}


struct hpsb_host *hpsb_get_host_bykey(struct hpsb_highlevel *hl, unsigned long key)
{
	struct list_head *lh;
	struct hl_host_info *hi;
	struct hpsb_host *host = NULL;

	if (!hl)
		return NULL;

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

	return host;
}


void hpsb_register_highlevel(struct hpsb_highlevel *hl)
{
	struct list_head *lh;
	unsigned long flags;

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

	rwlock_init(&hl->host_info_lock);

	write_lock_irqsave(&hl_drivers_lock, flags);
        list_add_tail(&hl->hl_list, &hl_drivers);
	write_unlock_irqrestore(&hl_drivers_lock, flags);

	if (hl->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->add_host(host);
		}
		up(&hpsb_hosts_lock);
	}

        return;
}

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

	write_lock_irqsave(&addr_space_lock, flags);
	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_irqrestore(&addr_space_lock, flags);

	write_lock_irqsave(&hl_drivers_lock, flags);
        list_del(&hl->hl_list);
	write_unlock_irqrestore(&hl_drivers_lock, flags);

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

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);