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/*

 * 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/slab.h>

#include <linux/list.h>

#include <linux/bitops.h>

#include "ieee1394.h"

#include "ieee1394_types.h"

#include "hosts.h"

#include "ieee1394_core.h"

#include "highlevel.h"

#include "nodemgr.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_RWSEM(hl_drivers_sem);

static LIST_HEAD(hl_irqs);

static DEFINE_RWLOCK(hl_irqs_lock);

static DEFINE_RWLOCK(addr_space_lock);

/* 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;

        if (!hl || !host)

                return NULL;

        read_lock(&hl->host_info_lock);

        list_for_each_entry(hi, &hl->host_info_list, list) {

                if (hi->host == host) {

                        read_unlock(&hl->host_info_lock);

                        return hi;

                }

        }

        read_unlock(&hl->host_info_lock);

        return NULL;

}

/**

 * hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host

 *

 * Returns a per @host and @hl 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);

        return hi ? hi->data : NULL;

}

/**

 * hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host

 *

 * Allocate a hostinfo pointer backed by memory with @data_size and bind it to

 * to this @hl driver and @host.  If @data_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 = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);

        if (!hi)

                return NULL;

        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;

}

/**

 * hpsb_set_hostinfo - set the hostinfo pointer to something useful

 *

 * Usually follows a call to hpsb_create_hostinfo, where the size is 0.

 */

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;

}

/**

 * hpsb_destroy_hostinfo - free and remove a hostinfo pointer

 *

 * Free and remove the hostinfo pointer bound to this @hl driver and @host.

 */

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;

}

/**

 * hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo

 *

 * Sets an alternate lookup key for the hostinfo bound to this @hl driver and

 * @host.

 */

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;

}

/**

 * hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key

 */

void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)

{

        struct hl_host_info *hi;

        void *data = NULL;

        if (!hl)

                return NULL;

        read_lock(&hl->host_info_lock);

        list_for_each_entry(hi, &hl->host_info_list, list) {

                if (hi->key == key) {

                        data = hi->data;

                        break;

                }

        }

        read_unlock(&hl->host_info_lock);

        return data;

}

static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)

{

        struct hpsb_highlevel *hl = __data;

        hl->add_host(host);

        if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)

                HPSB_ERR("Failed to generate Configuration ROM image for host "

                         "%s-%d", hl->name, host->id);

        return 0;

}

/**

 * hpsb_register_highlevel - register highlevel driver

 *

 * The name pointer in @hl has to stay valid at all times because the string is

 * not copied.

 */

void hpsb_register_highlevel(struct hpsb_highlevel *hl)

{

        unsigned long flags;

        INIT_LIST_HEAD(&hl->addr_list);

        INIT_LIST_HEAD(&hl->host_info_list);

        rwlock_init(&hl->host_info_lock);

        down_write(&hl_drivers_sem);

        list_add_tail(&hl->hl_list, &hl_drivers);

        up_write(&hl_drivers_sem);

        write_lock_irqsave(&hl_irqs_lock, flags);

        list_add_tail(&hl->irq_list, &hl_irqs);

        write_unlock_irqrestore(&hl_irqs_lock, flags);

        if (hl->add_host)

                nodemgr_for_each_host(hl, highlevel_for_each_host_reg);

        return;

}

static void __delete_addr(struct hpsb_address_serve *as)

{

        list_del(&as->host_list);

        list_del(&as->hl_list);

        kfree(as);

}

static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,

                              int update_cr)

{

        unsigned long flags;

        struct list_head *lh, *next;

        struct hpsb_address_serve *as;

        /* First, let the highlevel driver unreg */

        if (hl->remove_host)

                hl->remove_host(host);

        /* Remove any addresses that are matched for this highlevel driver

         * and this particular host. */

        write_lock_irqsave(&addr_space_lock, flags);

        list_for_each_safe (lh, next, &hl->addr_list) {

                as = list_entry(lh, struct hpsb_address_serve, hl_list);

                if (as->host == host)

                        __delete_addr(as);

        }

        write_unlock_irqrestore(&addr_space_lock, flags);

        /* Now update the config-rom to reflect anything removed by the

         * highlevel driver. */

        if (update_cr && host->update_config_rom &&

            hpsb_update_config_rom_image(host) < 0)

                HPSB_ERR("Failed to generate Configuration ROM image for host "

                         "%s-%d", hl->name, host->id);

        /* Finally remove all the host info associated between these two. */

        hpsb_destroy_hostinfo(hl, host);

}

static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)

{

        struct hpsb_highlevel *hl = __data;

        __unregister_host(hl, host, 1);

        return 0;

}

/**

 * hpsb_unregister_highlevel - unregister highlevel driver

 */

void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)

{

        unsigned long flags;

        write_lock_irqsave(&hl_irqs_lock, flags);

        list_del(&hl->irq_list);

        write_unlock_irqrestore(&hl_irqs_lock, flags);

        down_write(&hl_drivers_sem);

        list_del(&hl->hl_list);

        up_write(&hl_drivers_sem);

        nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);

}

/**

 * hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space

 *

 * @start and @end are 48 bit pointers and have to be quadlet aligned.

 * @end points to the first address behind the handled addresses.  This

 * function can be called multiple times for a single hpsb_highlevel @hl to

 * implement sparse register sets.  The requested region must not overlap any

 * previously allocated region, otherwise registering will fail.

 *

 * It returns true for successful allocation.  Address spaces can be

 * unregistered with hpsb_unregister_addrspace.  All remaining address spaces

 * are automatically deallocated together with the hpsb_highlevel @hl.

 */

u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,

                                         struct hpsb_host *host,

                                         struct hpsb_address_ops *ops,

                                         u64 size, u64 alignment,

                                         u64 start, u64 end)

{

        struct hpsb_address_serve *as, *a1, *a2;

        struct list_head *entry;

        u64 retval = CSR1212_INVALID_ADDR_SPACE;

        unsigned long flags;

        u64 align_mask = ~(alignment - 1);

        if ((alignment & 3) || (alignment > 0x800000000000ULL) ||

            (hweight64(alignment) != 1)) {

                HPSB_ERR("%s called with invalid alignment: 0x%048llx",

                         __FUNCTION__, (unsigned long long)alignment);

                return retval;

        }

        /* default range,

         * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */

        if (start == CSR1212_INVALID_ADDR_SPACE &&

            end   == CSR1212_INVALID_ADDR_SPACE) {

                start = host->middle_addr_space;

                end   = CSR1212_ALL_SPACE_END;

        }

        if (((start|end) & ~align_mask) || (start >= end) ||

            (end > CSR1212_ALL_SPACE_END)) {

                HPSB_ERR("%s called with invalid addresses "

                         "(start = %012Lx  end = %012Lx)", __FUNCTION__,

                         (unsigned long long)start,(unsigned long long)end);

                return retval;

        }

        as = kmalloc(sizeof(*as), GFP_KERNEL);

        if (!as)

                return retval;

        INIT_LIST_HEAD(&as->host_list);

        INIT_LIST_HEAD(&as->hl_list);

        as->op = ops;

        as->host = host;

        write_lock_irqsave(&addr_space_lock, flags);

        list_for_each(entry, &host->addr_space) {

                u64 a1sa, a1ea;

                u64 a2sa, a2ea;

                a1 = list_entry(entry, struct hpsb_address_serve, host_list);

                a2 = list_entry(entry->next, struct hpsb_address_serve,

                                host_list);

                a1sa = a1->start & align_mask;

                a1ea = (a1->end + alignment -1) & align_mask;

                a2sa = a2->start & align_mask;

                a2ea = (a2->end + alignment -1) & align_mask;

                if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&

                    (a2sa > start)) {

                        as->start = max(start, a1ea);

                        as->end = as->start + size;

                        list_add(&as->host_list, entry);

                        list_add_tail(&as->hl_list, &hl->addr_list);

                        retval = as->start;

                        break;

                }

        }

        write_unlock_irqrestore(&addr_space_lock, flags);

        if (retval == CSR1212_INVALID_ADDR_SPACE)

                kfree(as);

        return retval;

}

/**

 * hpsb_register_addrspace - register a host address space

 *

 * @start and @end are 48 bit pointers and have to be quadlet aligned.

 * @end points to the first address behind the handled addresses.  This

 * function can be called multiple times for a single hpsb_highlevel @hl to

 * implement sparse register sets.  The requested region must not overlap any

 * previously allocated region, otherwise registering will fail.

 *

 * It returns true for successful allocation.  Address spaces can be

 * unregistered with hpsb_unregister_addrspace.  All remaining address spaces

 * are automatically deallocated together with the hpsb_highlevel @hl.

 */

int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,

                            struct hpsb_address_ops *ops, u64 start, u64 end)

{

        struct hpsb_address_serve *as;

        struct list_head *lh;

        int retval = 0;

        unsigned long flags;

        if (((start|end) & 3) || (start >= end) ||

            (end > CSR1212_ALL_SPACE_END)) {

                HPSB_ERR("%s called with invalid addresses", __FUNCTION__);

                return 0;

        }

        as = kmalloc(sizeof(*as), GFP_ATOMIC);

        if (!as)

                return 0;

        INIT_LIST_HEAD(&as->host_list);

        INIT_LIST_HEAD(&as->hl_list);

        as->op = ops;

        as->start = start;

        as->end = end;

        as->host = host;

        write_lock_irqsave(&addr_space_lock, flags);

        list_for_each(lh, &host->addr_space) {

                struct hpsb_address_serve *as_this =

                        list_entry(lh, struct hpsb_address_serve, host_list);

                struct hpsb_address_serve *as_next =

                        list_entry(lh->next, struct hpsb_address_serve,

                                   host_list);

                if (as_this->end > as->start)

                        break;

                if (as_next->start >= as->end) {

                        list_add(&as->host_list, lh);

                        list_add_tail(&as->hl_list, &hl->addr_list);

                        retval = 1;

                        break;

                }

        }

        write_unlock_irqrestore(&addr_space_lock, flags);

        if (retval == 0)

                kfree(as);

        return retval;

}

int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,

                              u64 start)

{

        int retval = 0;

        struct hpsb_address_serve *as;

        struct list_head *lh, *next;

        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, hl_list);

                if (as->start == start && as->host == host) {

                        __delete_addr(as);

                        retval = 1;

                        break;

                }

        }

        write_unlock_irqrestore(&addr_space_lock, flags);

        return retval;

}

static void init_hpsb_highlevel(struct hpsb_host *host)

{

        INIT_LIST_HEAD(&dummy_zero_addr.host_list);

        INIT_LIST_HEAD(&dummy_zero_addr.hl_list);

        INIT_LIST_HEAD(&dummy_max_addr.host_list);

        INIT_LIST_HEAD(&dummy_max_addr.hl_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.host_list, &host->addr_space);

        list_add_tail(&dummy_max_addr.host_list, &host->addr_space);

}

void highlevel_add_host(struct hpsb_host *host)

{

        struct hpsb_highlevel *hl;

        init_hpsb_highlevel(host);

        down_read(&hl_drivers_sem);

        list_for_each_entry(hl, &hl_drivers, hl_list) {

                if (hl->add_host)

                        hl->add_host(host);

        }

        up_read(&hl_drivers_sem);

        if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)

                HPSB_ERR("Failed to generate Configuration ROM image for host "

                         "%s-%d", hl->name, host->id);

}

void highlevel_remove_host(struct hpsb_host *host)

{

        struct hpsb_highlevel *hl;

        down_read(&hl_drivers_sem);

        list_for_each_entry(hl, &hl_drivers, hl_list)

                __unregister_host(hl, host, 0);

        up_read(&hl_drivers_sem);

}

void highlevel_host_reset(struct hpsb_host *host)

{

        unsigned long flags;

        struct hpsb_highlevel *hl;

        read_lock_irqsave(&hl_irqs_lock, flags);

        list_for_each_entry(hl, &hl_irqs, irq_list) {

                if (hl->host_reset)

                        hl->host_reset(host);

        }

        read_unlock_irqrestore(&hl_irqs_lock, flags);

}

void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,

                           void *data, size_t length)

{

        unsigned long flags;

        struct hpsb_highlevel *hl;

        int cts = ((quadlet_t *)data)[0] >> 4;

        read_lock_irqsave(&hl_irqs_lock, flags);

        list_for_each_entry(hl, &hl_irqs, irq_list) {

                if (hl->fcp_request)

                        hl->fcp_request(host, nodeid, direction, cts, data,

                                        length);

        }

        read_unlock_irqrestore(&hl_irqs_lock, flags);

}

/*

 * highlevel_read, highlevel_write, highlevel_lock, highlevel_lock64:

 *

 * These functions are called to handle transactions. They are called when a

 * packet arrives.  The flags argument contains the second word of the first

 * header quadlet of the incoming packet (containing transaction label, retry

 * code, transaction code and priority).  These functions either return a

 * response code or a negative number.  In the first case a response will be

 * generated.  In the latter case, no response will be sent and the driver which

 * handled the request will send the response itself.

 */

int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,

                   unsigned int length, u16 flags)

{

        struct hpsb_address_serve *as;

        unsigned int partlength;

        int rcode = RCODE_ADDRESS_ERROR;

        read_lock(&addr_space_lock);

        list_for_each_entry(as, &host->addr_space, host_list) {

                if (as->start > addr)

                        break;

                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;

                        data += partlength;

                        length -= partlength;

                        addr += partlength;

                        if ((rcode != RCODE_COMPLETE) || !length)

                                break;

                }

        }

        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;

        unsigned int partlength;

        int rcode = RCODE_ADDRESS_ERROR;

        read_lock(&addr_space_lock);

        list_for_each_entry(as, &host->addr_space, host_list) {

                if (as->start > addr)

                        break;

                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;

                        data += partlength;

                        length -= partlength;

                        addr += partlength;

                        if ((rcode != RCODE_COMPLETE) || !length)

                                break;

                }

        }

        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;

        int rcode = RCODE_ADDRESS_ERROR;

        read_lock(&addr_space_lock);

        list_for_each_entry(as, &host->addr_space, host_list) {

                if (as->start > addr)

                        break;

                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;

                }

        }

        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;

        int rcode = RCODE_ADDRESS_ERROR;

        read_lock(&addr_space_lock);