nodemgr.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:25k
- /*
- * Node information (ConfigROM) collection and management.
- *
- * Copyright (C) 2000 Andreas E. Bombe
- * 2001 Ben Collins <bcollins@debian.net>
- *
- * 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 <linux/smp_lock.h>
- #include <linux/interrupt.h>
- #include <linux/kmod.h>
- #include "ieee1394_types.h"
- #include "ieee1394.h"
- #include "hosts.h"
- #include "ieee1394_transactions.h"
- #include "ieee1394_hotplug.h"
- #include "highlevel.h"
- #include "csr.h"
- #include "nodemgr.h"
- /*
- * Basically what we do here is start off retrieving the bus_info block.
- * From there will fill in some info about the node, verify it is of IEEE
- * 1394 type, and that the crc checks out ok. After that we start off with
- * the root directory, and subdirectories. To do this, we retrieve the
- * quadlet header for a directory, find out the length, and retrieve the
- * complete directory entry (be it a leaf or a directory). We then process
- * it and add the info to our structure for that particular node.
- *
- * We verify CRC's along the way for each directory/block/leaf. The
- * entire node structure is generic, and simply stores the information in
- * a way that's easy to parse by the protocol interface.
- */
- static LIST_HEAD(node_list);
- static rwlock_t node_lock = RW_LOCK_UNLOCKED;
- static LIST_HEAD(driver_list);
- static rwlock_t driver_lock = RW_LOCK_UNLOCKED;
- /* The rwlock unit_directory_lock is always held when manipulating the
- * global unit_directory_list, but this also protects access to the
- * lists of unit directories stored in the protocol drivers.
- */
- static LIST_HEAD(unit_directory_list);
- static rwlock_t unit_directory_lock = RW_LOCK_UNLOCKED;
- static LIST_HEAD(host_info_list);
- static spinlock_t host_info_lock = SPIN_LOCK_UNLOCKED;
- struct host_info {
- struct hpsb_host *host;
- struct tq_struct task;
- struct list_head list;
- };
- static void nodemgr_process_config_rom(struct node_entry *ne,
- quadlet_t busoptions);
- static struct node_entry *nodemgr_create_node(octlet_t guid, quadlet_t busoptions,
- struct hpsb_host *host, nodeid_t nodeid)
- {
- struct node_entry *ne;
- unsigned long flags;
- ne = kmalloc(sizeof(struct node_entry), SLAB_ATOMIC);
- if (!ne) return NULL;
- INIT_LIST_HEAD(&ne->list);
- INIT_LIST_HEAD(&ne->unit_directories);
- ne->host = host;
- ne->nodeid = nodeid;
- ne->guid = guid;
- atomic_set(&ne->generation, get_hpsb_generation(ne->host));
- write_lock_irqsave(&node_lock, flags);
- list_add_tail(&ne->list, &node_list);
- write_unlock_irqrestore(&node_lock, flags);
- nodemgr_process_config_rom (ne, busoptions);
- HPSB_DEBUG("%s added: node " NODE_BUS_FMT ", GUID %016Lx",
- (host->node_id == nodeid) ? "Local host" : "Device",
- NODE_BUS_ARGS(nodeid), (unsigned long long)guid);
- return ne;
- }
- static struct node_entry *find_entry_by_guid(u64 guid)
- {
- struct list_head *lh;
- struct node_entry *ne;
-
- list_for_each(lh, &node_list) {
- ne = list_entry(lh, struct node_entry, list);
- if (ne->guid == guid) return ne;
- }
- return NULL;
- }
- static struct node_entry *find_entry_by_nodeid(nodeid_t nodeid)
- {
- struct list_head *lh;
- struct node_entry *ne;
- list_for_each(lh, &node_list) {
- ne = list_entry(lh, struct node_entry, list);
- if (ne->nodeid == nodeid) return ne;
- }
- return NULL;
- }
- int nodemgr_read_quadlet(struct node_entry *ne,
- octlet_t address, quadlet_t *quad)
- {
- int i;
- int ret = 0;
- for (i = 0; i < 3; i++) {
- ret = hpsb_read(ne->host, ne->nodeid, address, quad, 4);
- if (ret != -EAGAIN)
- break;
- }
- *quad = be32_to_cpu(*quad);
- return ret;
- }
- #define CONFIG_ROM_VENDOR_ID 0x03
- #define CONFIG_ROM_MODEL_ID 0x17
- #define CONFIG_ROM_NODE_CAPABILITES 0x0C
- #define CONFIG_ROM_UNIT_DIRECTORY 0xd1
- #define CONFIG_ROM_SPECIFIER_ID 0x12
- #define CONFIG_ROM_VERSION 0x13
- #define CONFIG_ROM_DESCRIPTOR_LEAF 0x81
- #define CONFIG_ROM_DESCRIPTOR_DIRECTORY 0xc1
- /* This implementation currently only scans the config rom and its
- * immediate unit directories looking for software_id and
- * software_version entries, in order to get driver autoloading working.
- */
- static void nodemgr_process_unit_directory(struct node_entry *ne,
- octlet_t address)
- {
- struct unit_directory *ud;
- octlet_t a;
- quadlet_t quad;
- int length, i;
- if (!(ud = kmalloc (sizeof *ud, GFP_KERNEL)))
- goto unit_directory_error;
- memset (ud, 0, sizeof *ud);
- ud->ne = ne;
- ud->address = address;
- ud->arb_count = 0;
- if (nodemgr_read_quadlet(ne, address, &quad))
- goto unit_directory_error;
- length = quad >> 16;
- a = address + 4;
- for (i = 0; i < length; i++, a += 4) {
- int code;
- quadlet_t value;
- if (nodemgr_read_quadlet(ne, a, &quad))
- goto unit_directory_error;
- code = quad >> 24;
- value = quad & 0xffffff;
- switch (code) {
- case CONFIG_ROM_VENDOR_ID:
- ud->vendor_id = value;
- ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
- break;
- case CONFIG_ROM_MODEL_ID:
- ud->model_id = value;
- ud->flags |= UNIT_DIRECTORY_MODEL_ID;
- break;
- case CONFIG_ROM_SPECIFIER_ID:
- ud->specifier_id = value;
- ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
- break;
- case CONFIG_ROM_VERSION:
- ud->version = value;
- ud->flags |= UNIT_DIRECTORY_VERSION;
- break;
- case CONFIG_ROM_DESCRIPTOR_LEAF:
- case CONFIG_ROM_DESCRIPTOR_DIRECTORY:
- /* TODO: read strings... icons? */
- break;
- default:
- if (ud->arb_count < 16) {
- /* Place them in the arbitrary pairs */
- ud->arb_keys[ud->arb_count] = code;
- ud->arb_values[ud->arb_count] = value;
- ud->arb_count++;
- }
- }
- }
- list_add_tail(&ud->node_list, &ne->unit_directories);
- list_add_tail(&ud->driver_list, &unit_directory_list);
- return;
- unit_directory_error:
- if (ud != NULL)
- kfree(ud);
- }
- static void dump_directories (struct node_entry *ne)
- {
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- struct list_head *l;
- HPSB_DEBUG("vendor_id=0x%06x, capabilities=0x%06x",
- ne->vendor_id, ne->capabilities);
- list_for_each (l, &ne->unit_directories) {
- struct unit_directory *ud = list_entry (l, struct unit_directory, node_list);
- HPSB_DEBUG("unit directory:");
- if (ud->flags & UNIT_DIRECTORY_VENDOR_ID)
- HPSB_DEBUG(" vendor_id=0x%06x ", ud->vendor_id);
- if (ud->flags & UNIT_DIRECTORY_MODEL_ID)
- HPSB_DEBUG(" model_id=0x%06x ", ud->model_id);
- if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
- HPSB_DEBUG(" sw_specifier_id=0x%06x ", ud->specifier_id);
- if (ud->flags & UNIT_DIRECTORY_VERSION)
- HPSB_DEBUG(" sw_version=0x%06x ", ud->version);
- }
- #else
- return;
- #endif
- }
- static void nodemgr_process_root_directory(struct node_entry *ne)
- {
- octlet_t address;
- quadlet_t quad;
- int length, i;
- address = CSR_REGISTER_BASE + CSR_CONFIG_ROM;
-
- if (nodemgr_read_quadlet(ne, address, &quad))
- return;
- address += 4 + (quad >> 24) * 4;
- if (nodemgr_read_quadlet(ne, address, &quad))
- return;
- length = quad >> 16;
- address += 4;
- for (i = 0; i < length; i++, address += 4) {
- int code, value;
- if (nodemgr_read_quadlet(ne, address, &quad))
- return;
- code = quad >> 24;
- value = quad & 0xffffff;
- switch (code) {
- case CONFIG_ROM_VENDOR_ID:
- ne->vendor_id = value;
- break;
- case CONFIG_ROM_NODE_CAPABILITES:
- ne->capabilities = value;
- break;
- case CONFIG_ROM_UNIT_DIRECTORY:
- nodemgr_process_unit_directory(ne, address + value * 4);
- break;
- case CONFIG_ROM_DESCRIPTOR_LEAF:
- case CONFIG_ROM_DESCRIPTOR_DIRECTORY:
- /* TODO: read strings... icons? */
- break;
- }
- }
- dump_directories(ne);
- }
- #ifdef CONFIG_HOTPLUG
- static void nodemgr_call_policy(char *verb, struct unit_directory *ud)
- {
- char *argv [3], **envp, *buf, *scratch;
- int i = 0, value;
- if (!hotplug_path [0])
- return;
- if (!current->fs->root)
- return;
- if (!(envp = (char **) kmalloc(20 * sizeof (char *), GFP_KERNEL))) {
- HPSB_DEBUG ("ENOMEM");
- return;
- }
- if (!(buf = kmalloc(256, GFP_KERNEL))) {
- kfree(envp);
- HPSB_DEBUG("ENOMEM2");
- return;
- }
- /* only one standardized param to hotplug command: type */
- argv[0] = hotplug_path;
- argv[1] = "ieee1394";
- argv[2] = 0;
- /* minimal command environment */
- envp[i++] = "HOME=/";
- envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- /* hint that policy agent should enter no-stdout debug mode */
- envp[i++] = "DEBUG=kernel";
- #endif
- /* extensible set of named bus-specific parameters,
- * supporting multiple driver selection algorithms.
- */
- scratch = buf;
- envp[i++] = scratch;
- scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
- envp[i++] = scratch;
- scratch += sprintf(scratch, "VENDOR_ID=%06x", ud->ne->vendor_id) + 1;
- envp[i++] = scratch;
- scratch += sprintf(scratch, "GUID=%016Lx", (long long unsigned)ud->ne->guid) + 1;
- envp[i++] = scratch;
- scratch += sprintf(scratch, "SPECIFIER_ID=%06x", ud->specifier_id) + 1;
- envp[i++] = scratch;
- scratch += sprintf(scratch, "VERSION=%06x", ud->version) + 1;
- envp[i++] = 0;
- /* NOTE: user mode daemons can call the agents too */
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- HPSB_DEBUG("NodeMgr: %s %s %016Lx", argv[0], verb, (long long unsigned)ud->ne->guid);
- #endif
- value = call_usermodehelper(argv[0], argv, envp);
- kfree(buf);
- kfree(envp);
- if (value != 0)
- HPSB_DEBUG("NodeMgr: hotplug policy returned %d", value);
- }
- #else
- static inline void
- nodemgr_call_policy(char *verb, struct unit_directory *ud)
- {
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- HPSB_DEBUG("NodeMgr: nodemgr_call_policy(): hotplug not enabled");
- #endif
- return;
- }
- #endif /* CONFIG_HOTPLUG */
- static void nodemgr_claim_unit_directory(struct unit_directory *ud,
- struct hpsb_protocol_driver *driver)
- {
- ud->driver = driver;
- list_del(&ud->driver_list);
- list_add_tail(&ud->driver_list, &driver->unit_directories);
- }
- static void nodemgr_release_unit_directory(struct unit_directory *ud)
- {
- ud->driver = NULL;
- list_del(&ud->driver_list);
- list_add_tail(&ud->driver_list, &unit_directory_list);
- }
- void hpsb_release_unit_directory(struct unit_directory *ud)
- {
- unsigned long flags;
- write_lock_irqsave(&unit_directory_lock, flags);
- nodemgr_release_unit_directory(ud);
- write_unlock_irqrestore(&unit_directory_lock, flags);
- }
- static void nodemgr_free_unit_directories(struct node_entry *ne)
- {
- struct list_head *lh;
- struct unit_directory *ud;
- lh = ne->unit_directories.next;
- while (lh != &ne->unit_directories) {
- ud = list_entry(lh, struct unit_directory, node_list);
- lh = lh->next;
- if (ud->driver && ud->driver->disconnect)
- ud->driver->disconnect(ud);
- nodemgr_release_unit_directory(ud);
- nodemgr_call_policy("remove", ud);
- list_del(&ud->driver_list);
- kfree(ud);
- }
- }
- static struct ieee1394_device_id *
- nodemgr_match_driver(struct hpsb_protocol_driver *driver,
- struct unit_directory *ud)
- {
- struct ieee1394_device_id *id;
- for (id = driver->id_table; id->match_flags != 0; id++) {
- if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
- id->vendor_id != ud->vendor_id)
- continue;
- if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
- id->model_id != ud->model_id)
- continue;
- if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
- id->specifier_id != ud->specifier_id)
- continue;
- if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
- id->version != ud->version)
- continue;
- return id;
- }
- return NULL;
- }
- static struct hpsb_protocol_driver *
- nodemgr_find_driver(struct unit_directory *ud)
- {
- struct list_head *l;
- struct hpsb_protocol_driver *match, *driver;
- struct ieee1394_device_id *device_id;
- match = NULL;
- list_for_each(l, &driver_list) {
- driver = list_entry(l, struct hpsb_protocol_driver, list);
- device_id = nodemgr_match_driver(driver, ud);
- if (device_id != NULL) {
- match = driver;
- break;
- }
- }
- return match;
- }
- static void nodemgr_bind_drivers (struct node_entry *ne)
- {
- struct list_head *lh;
- struct hpsb_protocol_driver *driver;
- struct unit_directory *ud;
- list_for_each(lh, &ne->unit_directories) {
- ud = list_entry(lh, struct unit_directory, node_list);
- driver = nodemgr_find_driver(ud);
- if (driver != NULL && driver->probe(ud) == 0)
- nodemgr_claim_unit_directory(ud, driver);
- nodemgr_call_policy("add", ud);
- }
- }
- int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
- {
- struct unit_directory *ud;
- struct list_head *lh;
- unsigned long flags;
- write_lock_irqsave(&driver_lock, flags);
- list_add_tail(&driver->list, &driver_list);
- write_unlock_irqrestore(&driver_lock, flags);
- write_lock_irqsave(&unit_directory_lock, flags);
- INIT_LIST_HEAD(&driver->unit_directories);
- lh = unit_directory_list.next;
- while (lh != &unit_directory_list) {
- ud = list_entry(lh, struct unit_directory, driver_list);
- lh = lh->next;
- if (nodemgr_match_driver(driver, ud) && driver->probe(ud) == 0)
- nodemgr_claim_unit_directory(ud, driver);
- }
- write_unlock_irqrestore(&unit_directory_lock, flags);
- /*
- * Right now registration always succeeds, but maybe we should
- * detect clashes in protocols handled by other drivers.
- */
- return 0;
- }
- void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
- {
- struct list_head *lh;
- struct unit_directory *ud;
- unsigned long flags;
- write_lock_irqsave(&driver_lock, flags);
- list_del(&driver->list);
- write_unlock_irqrestore(&driver_lock, flags);
- write_lock_irqsave(&unit_directory_lock, flags);
- lh = driver->unit_directories.next;
- while (lh != &driver->unit_directories) {
- ud = list_entry(lh, struct unit_directory, driver_list);
- lh = lh->next;
- if (ud->driver && ud->driver->disconnect)
- ud->driver->disconnect(ud);
- nodemgr_release_unit_directory(ud);
- }
- write_unlock_irqrestore(&unit_directory_lock, flags);
- }
- static void nodemgr_process_config_rom(struct node_entry *ne,
- quadlet_t busoptions)
- {
- unsigned long flags;
- ne->busopt.irmc = (busoptions >> 31) & 1;
- ne->busopt.cmc = (busoptions >> 30) & 1;
- ne->busopt.isc = (busoptions >> 29) & 1;
- ne->busopt.bmc = (busoptions >> 28) & 1;
- ne->busopt.pmc = (busoptions >> 27) & 1;
- ne->busopt.cyc_clk_acc = (busoptions >> 16) & 0xff;
- ne->busopt.max_rec = 1 << (((busoptions >> 12) & 0xf) + 1);
- ne->busopt.generation = (busoptions >> 4) & 0xf;
- ne->busopt.lnkspd = busoptions & 0x7;
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- HPSB_DEBUG("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
- "cyc_clk_acc=%d max_rec=%d gen=%d lspd=%d",
- busoptions, ne->busopt.irmc, ne->busopt.cmc,
- ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
- ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
- ne->busopt.generation, ne->busopt.lnkspd);
- #endif
- /*
- * When the config rom changes we disconnect all drivers and
- * free the cached unit directories and reread the whole
- * thing. If this was a new device, the call to
- * nodemgr_disconnect_drivers is a no-op and all is well.
- */
- write_lock_irqsave(&unit_directory_lock, flags);
- nodemgr_free_unit_directories(ne);
- nodemgr_process_root_directory(ne);
- nodemgr_bind_drivers(ne);
- write_unlock_irqrestore(&unit_directory_lock, flags);
- }
- /*
- * This function updates nodes that were present on the bus before the
- * reset and still are after the reset. The nodeid and the config rom
- * may have changed, and the drivers managing this device must be
- * informed that this device just went through a bus reset, to allow
- * the to take whatever actions required.
- */
- static void nodemgr_update_node(struct node_entry *ne, quadlet_t busoptions,
- struct hpsb_host *host, nodeid_t nodeid)
- {
- struct list_head *lh;
- struct unit_directory *ud;
- if (ne->nodeid != nodeid) {
- HPSB_DEBUG("Node " NODE_BUS_FMT " changed to " NODE_BUS_FMT,
- NODE_BUS_ARGS(ne->nodeid), NODE_BUS_ARGS(nodeid));
- ne->nodeid = nodeid;
- }
- if (ne->busopt.generation != ((busoptions >> 4) & 0xf))
- nodemgr_process_config_rom (ne, busoptions);
- /* Since that's done, we can declare this record current */
- atomic_set(&ne->generation, get_hpsb_generation(ne->host));
- list_for_each (lh, &ne->unit_directories) {
- ud = list_entry (lh, struct unit_directory, node_list);
- if (ud->driver != NULL && ud->driver->update != NULL)
- ud->driver->update(ud);
- }
- }
- static int read_businfo_block(struct hpsb_host *host, nodeid_t nodeid,
- quadlet_t *buffer, int buffer_length)
- {
- octlet_t base = CSR_REGISTER_BASE + CSR_CONFIG_ROM;
- int retries = 3;
- int header_count;
- unsigned header_size;
- quadlet_t quad;
- retry_configrom:
- if (!retries--) {
- HPSB_ERR("Giving up on node " NODE_BUS_FMT
- " for ConfigROM probe, too many errors",
- NODE_BUS_ARGS(nodeid));
- return -1;
- }
- header_count = 0;
- header_size = 0;
- #ifdef CONFIG_IEEE1394_VERBOSEDEBUG
- HPSB_INFO("Initiating ConfigROM request for node " NODE_BUS_FMT,
- NODE_BUS_ARGS(nodeid));
- #endif
- /* Now, P1212 says that devices should support 64byte block
- * reads, aligned on 64byte boundaries. That doesn't seem
- * to work though, and we are forced to doing quadlet
- * sized reads. */
- if (hpsb_read(host, nodeid, base, &quad, 4)) {
- HPSB_ERR("ConfigROM quadlet transaction error for node " NODE_BUS_FMT,
- NODE_BUS_ARGS(nodeid));
- goto retry_configrom;
- }
- buffer[header_count++] = be32_to_cpu(quad);
- header_size = buffer[0] >> 24;
- if (header_size < 4) {
- HPSB_INFO("Node " NODE_BUS_FMT " has non-standard ROM format (%d quads), "
- "cannot parse", NODE_BUS_ARGS(nodeid), header_size);
- return -1;
- }
- while (header_count <= header_size && header_count < buffer_length) {
- if (hpsb_read(host, nodeid, base + (header_count<<2), &quad, 4)) {
- HPSB_ERR("ConfigROM quadlet transaction error for " NODE_BUS_FMT,
- NODE_BUS_ARGS(nodeid));
- goto retry_configrom;
- }
- buffer[header_count++] = be32_to_cpu(quad);
- }
- return 0;
- }
- static void nodemgr_remove_node(struct node_entry *ne)
- {
- unsigned long flags;
- HPSB_DEBUG("Device removed: node " NODE_BUS_FMT ", GUID %016Lx",
- NODE_BUS_ARGS(ne->nodeid), (unsigned long long)ne->guid);
- write_lock_irqsave(&unit_directory_lock, flags);
- nodemgr_free_unit_directories(ne);
- write_unlock_irqrestore(&unit_directory_lock, flags);
- list_del(&ne->list);
- kfree(ne);
- return;
- }
- /* Used to schedule each nodes config rom probe */
- struct node_probe_task {
- nodeid_t nodeid;
- struct hpsb_host *host;
- atomic_t *count;
- struct tq_struct task;
- };
- /* This is where we probe the nodes for their information and provided
- * features. */
- static void nodemgr_node_probe_one(void *__npt)
- {
- struct node_probe_task *npt = (struct node_probe_task *)__npt;
- struct node_entry *ne;
- quadlet_t buffer[5];
- octlet_t guid;
- /* We need to detect when the ConfigROM's generation has changed,
- * so we only update the node's info when it needs to be. */
- if (read_businfo_block (npt->host, npt->nodeid, buffer, sizeof(buffer) >> 2))
- goto probe_complete;
- if (buffer[1] != IEEE1394_BUSID_MAGIC) {
- /* This isn't a 1394 device */
- HPSB_ERR("Node " NODE_BUS_FMT " isn't an IEEE 1394 device",
- NODE_BUS_ARGS(npt->nodeid));
- goto probe_complete;
- }
- guid = ((u64)buffer[3] << 32) | buffer[4];
- ne = hpsb_guid_get_entry(guid);
- if (!ne)
- nodemgr_create_node(guid, buffer[2], npt->host, npt->nodeid);
- else
- nodemgr_update_node(ne, buffer[2], npt->host, npt->nodeid);
- probe_complete:
- atomic_dec(npt->count);
- kfree(npt);
- return;
- }
- static void nodemgr_node_probe_cleanup(void *__npt)
- {
- struct node_probe_task *npt = (struct node_probe_task *)__npt;
- unsigned long flags;
- struct list_head *lh, *next;
- struct node_entry *ne;
- /* If things aren't done yet, reschedule ourselves. */
- if (atomic_read(npt->count)) {
- schedule_task(&npt->task);
- return;
- }
- kfree(npt->count);
- /* Now check to see if we have any nodes that aren't referenced
- * any longer. */
- write_lock_irqsave(&node_lock, flags);
- for (lh = node_list.next; lh != &node_list; lh = next) {
- ne = list_entry(lh, struct node_entry, list);
- next = lh->next;
- /* Only checking this host */
- if (ne->host != npt->host)
- continue;
- /* If the generation didn't get updated, then either the
- * node was removed, or it failed the above probe. Either
- * way, we remove references to it, since they are
- * invalid. */
- if (!hpsb_node_entry_valid(ne))
- nodemgr_remove_node(ne);
- }
- write_unlock_irqrestore(&node_lock, flags);
- kfree(npt);
- return;
- }
- static void nodemgr_node_probe(void *__host)
- {
- struct hpsb_host *host = (struct hpsb_host *)__host;
- int nodecount = host->node_count;
- struct selfid *sid = (struct selfid *)host->topology_map;
- nodeid_t nodeid = LOCAL_BUS;
- struct node_probe_task *npt;
- atomic_t *count;
- count = kmalloc(sizeof (*count), GFP_KERNEL);
- if (count == NULL) {
- HPSB_ERR ("NodeMgr: out of memory in nodemgr_node_probe");
- return;
- }
- atomic_set(count, 0);
- for (; nodecount; nodecount--, nodeid++, sid++) {
- while (sid->extended)
- sid++;
- if (!sid->link_active || nodeid == host->node_id)
- continue;
- npt = kmalloc(sizeof (*npt), GFP_KERNEL);
- if (npt == NULL) {
- HPSB_ERR ("NodeMgr: out of memory in nodemgr_node_probe");
- break;
- }
- INIT_TQUEUE(&npt->task, nodemgr_node_probe_one, npt);
- npt->host = host;
- npt->nodeid = nodeid;
- npt->count = count;
- atomic_inc(count);
- schedule_task(&npt->task);
- }
- /* Now schedule a task to clean things up after the node probes
- * are done. */
- npt = kmalloc (sizeof (*npt), GFP_KERNEL);
- if (npt == NULL) {
- HPSB_ERR ("NodeMgr: out of memory in nodemgr_node_probe");
- return;
- }
- INIT_TQUEUE(&npt->task, nodemgr_node_probe_cleanup, npt);
- npt->host = host;
- npt->nodeid = 0;
- npt->count = count;
- schedule_task(&npt->task);
- return;
- }
- struct node_entry *hpsb_guid_get_entry(u64 guid)
- {
- unsigned long flags;
- struct node_entry *ne;
- read_lock_irqsave(&node_lock, flags);
- ne = find_entry_by_guid(guid);
- read_unlock_irqrestore(&node_lock, flags);
- return ne;
- }
- struct node_entry *hpsb_nodeid_get_entry(nodeid_t nodeid)
- {
- unsigned long flags;
- struct node_entry *ne;
- read_lock_irqsave(&node_lock, flags);
- ne = find_entry_by_nodeid(nodeid);
- read_unlock_irqrestore(&node_lock, flags);
- return ne;
- }
- struct hpsb_host *hpsb_get_host_by_ne(struct node_entry *ne)
- {
- if (atomic_read(&ne->generation) != get_hpsb_generation(ne->host))
- return NULL;
- if (ne->nodeid == ne->host->node_id) return ne->host;
- return NULL;
- }
- int hpsb_guid_fill_packet(struct node_entry *ne, struct hpsb_packet *pkt)
- {
- if (atomic_read(&ne->generation) != get_hpsb_generation(ne->host))
- return 0;
- pkt->host = ne->host;
- pkt->node_id = ne->nodeid;
- pkt->generation = atomic_read(&ne->generation);
- return 1;
- }
- static void nodemgr_add_host(struct hpsb_host *host)
- {
- struct host_info *hi = kmalloc (sizeof (struct host_info), GFP_KERNEL);
- unsigned long flags;
- if (!hi) {
- HPSB_ERR ("NodeMgr: out of memory in add host");
- return;
- }
- /* We simply initialize the struct here. We don't start the thread
- * until the first bus reset. */
- hi->host = host;
- INIT_LIST_HEAD(&hi->list);
- INIT_TQUEUE(&hi->task, nodemgr_node_probe, host);
- spin_lock_irqsave (&host_info_lock, flags);
- list_add_tail (&hi->list, &host_info_list);
- spin_unlock_irqrestore (&host_info_lock, flags);
- return;
- }
- static void nodemgr_host_reset(struct hpsb_host *host)
- {
- struct list_head *lh;
- struct host_info *hi = NULL;
- unsigned long flags;
- spin_lock_irqsave (&host_info_lock, flags);
- list_for_each(lh, &host_info_list) {
- struct host_info *myhi = list_entry(lh, struct host_info, list);
- if (myhi->host == host) {
- hi = myhi;
- break;
- }
- }
- if (hi == NULL) {
- HPSB_ERR ("NodeMgr: could not process reset of non-existent host");
- goto done_reset_host;
- }
- schedule_task(&hi->task);
- done_reset_host:
- spin_unlock_irqrestore (&host_info_lock, flags);
- return;
- }
- static void nodemgr_remove_host(struct hpsb_host *host)
- {
- struct list_head *lh, *next;
- struct node_entry *ne;
- unsigned long flags;
- /* Make sure we have no active scans */
- flush_scheduled_tasks();
- /* First remove all node entries for this host */
- write_lock_irqsave(&node_lock, flags);
- for (lh = node_list.next; lh != &node_list; lh = next) {
- ne = list_entry(lh, struct node_entry, list);
- next = lh->next;
- /* Only checking this host */
- if (ne->host != host)
- continue;
- nodemgr_remove_node(ne);
- }
- write_unlock_irqrestore(&node_lock, flags);
- spin_lock_irqsave (&host_info_lock, flags);
- list_for_each_safe(lh, next, &host_info_list) {
- struct host_info *hi = list_entry(lh, struct host_info, list);
- if (hi->host == host) {
- list_del(&hi->list);
- kfree (hi);
- break;
- }
- }
- if (lh == host_info_list.next)
- HPSB_ERR ("NodeMgr: could not remove non-existent host");
- spin_unlock_irqrestore (&host_info_lock, flags);
- return;
- }
- static struct hpsb_highlevel_ops nodemgr_ops = {
- add_host: nodemgr_add_host,
- host_reset: nodemgr_host_reset,
- remove_host: nodemgr_remove_host,
- };
- static struct hpsb_highlevel *hl;
- void init_ieee1394_nodemgr(void)
- {
- hl = hpsb_register_highlevel("Node manager", &nodemgr_ops);
- if (!hl) {
- HPSB_ERR("NodeMgr: out of memory during ieee1394 initialization");
- }
- }
- void cleanup_ieee1394_nodemgr(void)
- {
- hpsb_unregister_highlevel(hl);
- }