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/*
* IEEE 1394 for Linux
*
* GUID collection and management
*
* Copyright (C) 2000 Andreas E. Bombe
*
* This code is licensed under the GPL. See the file COPYING in the root
* directory of the kernel sources for details.
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <asm/atomic.h>
#include "ieee1394_types.h"
#include "ieee1394.h"
#include "hosts.h"
#include "ieee1394_transactions.h"
#include "highlevel.h"
#include "csr.h"
static atomic_t outstanding_requests;
static LIST_HEAD(guid_list);
rwlock_t guid_lock = RW_LOCK_UNLOCKED;
struct guid_entry {
struct list_head list;
atomic_t refcount;
u64 guid;
struct hpsb_host *host;
nodeid_t node_id;
atomic_t generation;
};
struct guid_req {
struct hpsb_packet *pkt;
struct tq_struct tq;
};
static struct guid_entry *create_guid_entry(void)
{
struct guid_entry *ge;
unsigned long flags;
ge = kmalloc(sizeof(struct guid_entry), SLAB_ATOMIC);
if (!ge) return NULL;
INIT_LIST_HEAD(&ge->list);
atomic_set(&ge->refcount, 0);
ge->guid = (u64) -1;
ge->host = NULL;
ge->node_id = 0;
atomic_set(&ge->generation, -1);
write_lock_irqsave(&guid_lock, flags);
list_add_tail(&ge->list, &guid_list);
write_unlock_irqrestore(&guid_lock, flags);
return ge;
}
static struct guid_entry *find_entry(u64 guid)
{
struct list_head *lh;
struct guid_entry *ge;
lh = guid_list.next;
while (lh != &guid_list) {
ge = list_entry(lh, struct guid_entry, list);
if (ge->guid == guid) return ge;
lh = lh->next;
}
return NULL;
}
static void associate_guid(struct hpsb_host *host, nodeid_t nodeid, u64 guid)
{
struct guid_entry *ge;
unsigned long flags;
HPSB_DEBUG("node %d on host 0x%p has GUID 0x%08x%08x",
nodeid & NODE_MASK, host, (unsigned int)(guid >> 32),
(unsigned int)(guid & 0xffffffff));
read_lock_irqsave(&guid_lock, flags);
ge = find_entry(guid);
read_unlock_irqrestore(&guid_lock, flags);
if (!ge) ge = create_guid_entry();
if (!ge) return;
ge->host = host;
ge->node_id = nodeid;
ge->guid = guid;
atomic_set(&ge->generation, get_hpsb_generation());
}
static void pkt_complete(struct guid_req *req)
{
struct hpsb_packet *pkt = req->pkt;
int rcode = (pkt->header[1] >> 12) & 0xf;
if (pkt->ack_code == ACK_PENDING && rcode == RCODE_COMPLETE) {
if (*(char *)pkt->data > 1) {
associate_guid(pkt->host, pkt->node_id,
((u64)be32_to_cpu(pkt->data[3]) << 32)
| be32_to_cpu(pkt->data[4]));
} else {
HPSB_DEBUG("minimal ROM on node %d",
pkt->node_id & NODE_MASK);
}
} else {
HPSB_DEBUG("guid transaction error: ack %d, rcode %d",
pkt->ack_code, rcode);
}
free_tlabel(pkt->host, pkt->node_id, pkt->tlabel);
free_hpsb_packet(pkt);
kfree(req);
if (atomic_dec_and_test(&outstanding_requests)) {
/* FIXME: free unreferenced and inactive GUID entries. */
}
}
static void host_reset(struct hpsb_host *host)
{
struct guid_req *greq;
struct hpsb_packet *pkt;
struct selfid *sid = (struct selfid *)host->topology_map;
int nodecount = host->node_count;
nodeid_t nodeid = LOCAL_BUS;
for (; nodecount; nodecount--, nodeid++, sid++) {
while (sid->extended) sid++;
if (!sid->link_active) continue;
if (nodeid == host->node_id) continue;
greq = kmalloc(sizeof(struct guid_req), SLAB_ATOMIC);
if (!greq) {
HPSB_ERR("out of memory in GUID processing");
return;
}
pkt = hpsb_make_readbpacket(host, nodeid,
CSR_REGISTER_BASE + CSR_CONFIG_ROM,
20);
if (!pkt) {
kfree(greq);
HPSB_ERR("out of memory in GUID processing");
return;
}
INIT_TQ_LINK(greq->tq);
greq->tq.sync = 0;
greq->tq.routine = (void (*)(void*))pkt_complete;
greq->tq.data = greq;
greq->pkt = pkt;
queue_task(&greq->tq, &pkt->complete_tq);
if (!hpsb_send_packet(pkt)) {
free_tlabel(pkt->host, pkt->node_id, pkt->tlabel);
free_hpsb_packet(pkt);
kfree(greq);
HPSB_NOTICE("failed to send packet in GUID processing");
}
HPSB_INFO("GUID request sent to node %d", nodeid & NODE_MASK);
atomic_inc(&outstanding_requests);
}
}
struct guid_entry *hpsb_guid_get_handle(u64 guid)
{
unsigned long flags;
struct guid_entry *ge;
read_lock_irqsave(&guid_lock, flags);
ge = find_entry(guid);
if (ge) atomic_inc(&ge->refcount);
read_unlock_irqrestore(&guid_lock, flags);
return ge;
}
struct hpsb_host *hpsb_guid_localhost(struct guid_entry *ge)
{
if (atomic_read(&ge->generation) != get_hpsb_generation()) return NULL;
if (ge->node_id == ge->host->node_id) return ge->host;
return NULL;
}
int hpsb_guid_fill_packet(struct guid_entry *ge, struct hpsb_packet *pkt)
{
if (atomic_read(&ge->generation) != get_hpsb_generation()) return 0;
pkt->host = ge->host;
pkt->node_id = ge->node_id;
pkt->generation = atomic_read(&ge->generation);
return 1;
}
static struct hpsb_highlevel_ops guid_ops = {
host_reset: host_reset,
};
static struct hpsb_highlevel *hl;
void init_ieee1394_guid(void)
{
atomic_set(&outstanding_requests, 0);
hl = hpsb_register_highlevel("GUID manager", &guid_ops);
if (!hl) {
HPSB_ERR("out of memory during ieee1394 initialization");
}
}
void cleanup_ieee1394_guid(void)
{
hpsb_unregister_highlevel(hl);
}
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