/*
* This file is part of the zfcp device driver for
* FCP adapters for IBM System z9 and zSeries.
*
* (C) Copyright IBM Corp. 2002, 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Driver authors:
* Martin Peschke (originator of the driver)
* Raimund Schroeder
* Aron Zeh
* Wolfgang Taphorn
* Stefan Bader
* Heiko Carstens (kernel 2.6 port of the driver)
* Andreas Herrmann
* Maxim Shchetynin
* Volker Sameske
* Ralph Wuerthner
*/
#include <linux/miscdevice.h>
#include "zfcp_ext.h"
/* accumulated log level (module parameter) */
static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
static char *device;
/*********************** FUNCTION PROTOTYPES *********************************/
/* written against the module interface */
static int __init zfcp_module_init(void);
/*********************** KERNEL/MODULE PARAMETERS ***************************/
/* declare driver module init/cleanup functions */
module_init(zfcp_module_init);
MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
MODULE_DESCRIPTION
("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
MODULE_LICENSE("GPL");
module_param(device, charp, 0400);
MODULE_PARM_DESC(device, "specify initial device");
module_param(loglevel, uint, 0400);
MODULE_PARM_DESC(loglevel,
"log levels, 8 nibbles: "
"FC ERP QDIO CIO Config FSF SCSI Other, "
"levels: 0=none 1=normal 2=devel 3=trace");
/****************************************************************/
/************** Functions without logging ***********************/
/****************************************************************/
void
_zfcp_hex_dump(char *addr, int count)
{
int i;
for (i = 0; i < count; i++) {
printk("%02x", addr[i]);
if ((i % 4) == 3)
printk(" ");
if ((i % 32) == 31)
printk("\n");
}
if (((i-1) % 32) != 31)
printk("\n");
}
/****************************************************************/
/****** Functions to handle the request ID hash table ********/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FSF
static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
{
int idx;
adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
GFP_KERNEL);
if (!adapter->req_list)
return -ENOMEM;
for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
INIT_LIST_HEAD(&adapter->req_list[idx]);
return 0;
}
static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
{
kfree(adapter->req_list);
}
int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
{
unsigned int idx;
for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
if (!list_empty(&adapter->req_list[idx]))
return 0;
return 1;
}
#undef ZFCP_LOG_AREA
/****************************************************************/
/************** Uncategorised Functions *************************/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
/**
* zfcp_device_setup - setup function
* @str: pointer to parameter string
*
* Parse "device=..." parameter string.
*/
static int __init
zfcp_device_setup(char *devstr)
{
char *tmp, *str;
size_t len;
if (!devstr)
return 0;
len = strlen(devstr) + 1;
str = kmalloc(len, GFP_KERNEL);
if (!str)
goto err_out;
memcpy(str, devstr, len);
tmp = strchr(str, ',');
if (!tmp)
goto err_out;
*tmp++ = '\0';
strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
if (*tmp++ != ',')
goto err_out;
if (*tmp == '\0')
goto err_out;
zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
if (*tmp != '\0')
goto err_out;
kfree(str);
return 1;
err_out:
ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
kfree(str);
return 0;
}
static void __init
zfcp_init_device_configure(void)
{
struct zfcp_adapter *adapter;
struct zfcp_port *port;
struct zfcp_unit *unit;
down(&zfcp_data.config_sema);
read_lock_irq(&zfcp_data.config_lock);
adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
if (adapter)
zfcp_adapter_get(adapter);
read_unlock_irq(&zfcp_data.config_lock);
if (adapter == NULL)
goto out_adapter;
port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
if (!port)
goto out_port;
unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
if (!unit)
goto out_unit;
up(&zfcp_data.config_sema);
ccw_device_set_online(adapter->ccw_device);
zfcp_erp_wait(adapter);
down(&zfcp_data.config_sema);
zfcp_unit_put(unit);
out_unit:
zfcp_port_put(port);
out_port:
zfcp_adapter_put(adapter);
out_adapter:
up(&zfcp_data.config_sema);
return;
}
static int calc_alignment(int size)
{
int align = 1;
if (!size)
return 0;
while ((size - align) > 0)
align <<= 1;
return align;
}
static int __init
zfcp_module_init(void)
{
int retval = -ENOMEM;
int size, align;
size = sizeof(struct zfcp_fsf_req_qtcb);
align = calc_alignment(size);
zfcp_data.fsf_req_qtcb_cache =
kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
if (!zfcp_data.fsf_req_qtcb_cache)
goto out;
size = sizeof(struct fsf_status_read_buffer);
align = calc_alignment(size);
zfcp_data.sr_buffer_cache =
kmem_cache_create("zfcp_sr", size, align, 0, NULL);
if (!zfcp_data.sr_buffer_cache)
goto out_sr_cache;
size = sizeof(struct zfcp_gid_pn_data);
align = calc_alignment(size);
zfcp_data.gid_pn_cache =
kmem_cache_create("zfcp_gid", size, align, 0, NULL);
if (!zfcp_data.gid_pn_cache)
goto out_gid_cache;
atomic_set(&zfcp_data.loglevel, loglevel);
/* initialize adapter list */
INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
/* initialize adapters to be removed list head */
INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
zfcp_data.scsi_transport_template =
fc_attach_transport(&zfcp_transport_functions);
if (!zfcp_data.scsi_transport_template)
goto out_transport;
retval = misc_register(&zfcp_cfdc_misc);
if (retval != 0) {
ZFCP_LOG_INFO("registration of misc device "
"zfcp_cfdc failed\n");
goto out_misc;
}
/* Initialise proc semaphores */
sema_init(&zfcp_data.config_sema, 1);
/* initialise configuration rw lock */
rwlock_init(&zfcp_data.config_lock);
/* setup dynamic I/O */
retval = zfcp_ccw_register();
if (retval) {
ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
goto out_ccw_register;
}
if (zfcp_device_setup(device))
zfcp_init_device_configure();
goto out;
out_ccw_register:
misc_deregister(&zfcp_cfdc_misc);
out_misc:
fc_release_transport(zfcp_data.scsi_transport_template);
out_transport:
kmem_cache_destroy(zfcp_data.gid_pn_cache);
out_gid_cache:
kmem_cache_destroy(zfcp_data.sr_buffer_cache);
out_sr_cache:
kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
out:
return retval;
}
#undef ZFCP_LOG_AREA
/****************************************************************/
/****** Functions for configuration/set-up of structures ********/
/****************************************************************/
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
/**
* zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
* @port: pointer to port to search for unit
* @fcp_lun: FCP LUN to search for
* Traverse list of all units of a port and return pointer to a unit
* with the given FCP LUN.
*/
struct zfcp_unit *
zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
{
struct zfcp_unit *unit;
int found = 0;
list_for_each_entry(unit, &port->unit_list_head, list) {
if ((unit->fcp_lun == fcp_lun) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
{
found = 1;
break;
}
}
return found ? unit : NULL;
}
/**
* zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
* @adapter: pointer to adapter to search for port
* @wwpn: wwpn to search for
* Traverse list of all ports of an adapter and return pointer to a port
* with the given wwpn.
*/
struct zfcp_port *
zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
{
struct zfcp_port *port;
int found = 0;
list_for_each_entry(port, &adapter->port_list_head, list) {
if ((port->wwpn == wwpn) &&
!(atomic_read(&port->status) &
(ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
found = 1;
break;
}
}
return found ? port : NULL;
}
/**
* zfcp_get_port_by_did - find port in port list of adapter by d_id
* @adapter: pointer to adapter to search for port
* @d_id: d_id to search for
* Traverse list of all ports of an adapter and return pointer to a port
* with the given d_id.
*/
struct zfcp_port *
zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
{
struct zfcp_port *port;
int found = 0;
list_for_each_entry(port, &adapter->port_list_head, list) {
if ((port->d_id == d_id) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
{
found = 1;
break;
}
}
return found ? port : NULL;
}
/**
* zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
* @bus_id: bus_id to search for
* Traverse list of all adapters and return pointer to an adapter
* with the given bus_id.
*/
struct zfcp_adapter *
zfcp_get_adapter_by_busid(char *bus_id)
{
struct zfcp_adapter *adapter;
int found = 0;
list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
BUS_ID_SIZE) == 0) &&
!atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
&adapter->status)){
found = 1;
break;
}
}
return found ? adapter : NULL;
}
/**
* zfcp_unit_enqueue - enqueue unit to unit list of a port.
* @port: pointer to port where unit is added
* @fcp_lun: FCP LUN of unit to be enqueued
* Return: pointer to enqueued unit on success, NULL on error
* Locks: config_sema must be held to serialize changes to the unit list
*
* Sets up some unit internal structures and creates sysfs entry.
*/
struct zfcp_unit *
zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
{
struct zfcp_unit *unit;
/*
* check that there is no unit with this FCP_LUN already in list
* and enqueue it.
* Note: Unlike for the adapter and the port, this is an error
*/
read_lock_irq(&zfcp_data.config_lock);
unit = zfcp_get_unit_by_lun(port, fcp_lun);
read_unlock_irq(&zfcp_data.config_lock);
if (unit)
return NULL;
unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
if (!unit)
return NULL;
/* initialise reference count stuff */
atomic_set(&unit->refcount, 0);
init_waitqueue_head(&unit->remove_wq);
unit->port = port;
unit->fcp_lun = fcp_lun;
/* setup for sysfs registration */
snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
unit->sysfs_device.parent = &port->sysfs_device;
unit->sysfs_device.release = zfcp_sysfs_unit_release;
dev_set_drvdata(&unit->sysfs_device, unit);
/* mark unit unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
spin_lock_init(&unit->latencies.lock);
unit->latencies.write.channel.min = 0xFFFFFFFF;
unit->latencies.write.fabric.min = 0xFFFFFFFF;
unit->latencies.read.channel.min = 0xFFFFFFFF;
unit->latencies.read.fabric.min = 0xFFFFFFFF;
unit->latencies.cmd.channel.min = 0xFFFFFFFF;
unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
if (device_register(&unit->sysfs_device)) {
kfree(unit);
return NULL;
}
if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
device_unregister(&unit->sysfs_device);
return NULL;
}
zfcp_unit_get(unit);
unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
write_lock_irq(&zfcp_data.config_lock);
list_add_tail(&unit->list, &port->unit_list_head);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
write_unlock_irq(&zfcp_data.config_lock);
port->units++;
zfcp_port_get(port);
return unit;
}
void
zfcp_unit_dequeue(struct zfcp_unit *unit)
{
zfcp_unit_wait(unit);
write_lock_irq(&zfcp_data.config_lock);
list_del(&unit->list);
write_unlock_irq(&zfcp_data.config_lock);
unit->port->units--;
zfcp_port_put(unit->port);
zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
device_unregister(&unit->sysfs_device);
}
/*
* Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
* commands.
* It also genrates fcp-nameserver request/response buffer and unsolicited
* status read fsf_req buffers.
*
* locks: must only be called with zfcp_data.config_sema taken
*/
static int
zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
adapter->pool.fsf_req_erp =
mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_erp)
return -ENOMEM;
adapter->pool.fsf_req_scsi =
mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_scsi)
return -ENOMEM;
adapter->pool.fsf_req_abort =
mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_abort)
return -ENOMEM;
adapter->pool.fsf_req_status_read =
mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
sizeof(struct zfcp_fsf_req));
if (!adapter->pool.fsf_req_status_read)
return -ENOMEM;
adapter->pool.data_status_read =
mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
zfcp_data.sr_buffer_cache);
if (!adapter->pool.data_status_read)
return -ENOMEM;
adapter->pool.data_gid_pn =
mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
zfcp_data.gid_pn_cache);
if (!adapter->pool.data_gid_pn)
return -ENOMEM;
return 0;
}
/**
* zfcp_free_low_mem_buffers - free memory pools of an adapter
* @adapter: pointer to zfcp_adapter for which memory pools should be freed
* locking: zfcp_data.config_sema must be held
*/
static void
zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
if (adapter->pool.fsf_req_erp)
mempool_destroy(adapter->pool.fsf_req_erp);
if (adapter->pool.fsf_req_scsi)
mempool_destroy(adapter->pool.fsf_req_scsi);
if (adapter->pool.fsf_req_abort)
mempool_destroy(adapter->pool.fsf_req_abort);
if (adapter->pool.fsf_req_status_read)
mempool_destroy(adapter->pool.fsf_req_status_read);
if (adapter->pool.data_status_read)
mempool_destroy(adapter->pool.data_status_read);
if (adapter->pool.data_gid_pn)
mempool_destroy(adapter->pool.data_gid_pn);
}
static void zfcp_dummy_release(struct device *dev)
{
return;
}
int zfcp_status_read_refill(struct zfcp_adapter *adapter)
{
while (atomic_read(&adapter->stat_miss) > 0)
if (zfcp_fsf_status_read(adapter, ZFCP_WAIT_FOR_SBAL))
break;
else
atomic_dec(&adapter->stat_miss);
if (ZFCP_STATUS_READS_RECOM <= atomic_read(&adapter->stat_miss)) {
zfcp_erp_adapter_reopen(adapter, 0, 103, NULL);
return 1;
}
return 0;
}
static void _zfcp_status_read_scheduler(struct work_struct *work)
{
zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
stat_work));
}
/*
* Enqueues an adapter at the end of the adapter list in the driver data.
* All adapter internal structures are set up.
* Proc-fs entries are also created.
*
* returns: 0 if a new adapter was successfully enqueued
* ZFCP_KNOWN if an adapter with this devno was already present
* -ENOMEM if alloc failed
* locks: config_sema must be held to serialise changes to the adapter list
*/
struct zfcp_adapter *
zfcp_adapter_enqueue(struct ccw_device *ccw_device)
{
struct zfcp_adapter *adapter;
/*
* Note: It is safe to release the list_lock, as any list changes
* are protected by the config_sema, which must be held to get here
*/
/* try to allocate new adapter data structure (zeroed) */
adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
if (!adapter) {
ZFCP_LOG_INFO("error: allocation of base adapter "
"structure failed\n");
goto out;
}
ccw_device->handler = NULL;
/* save ccw_device pointer */
adapter->ccw_device = ccw_device;
if (zfcp_qdio_allocate(adapter))
goto qdio_allocate_failed;
if (zfcp_allocate_low_mem_buffers(adapter))
goto failed_low_mem_buffers;
/* initialise reference count stuff */
atomic_set(&adapter->refcount, 0);
init_waitqueue_head(&adapter->remove_wq);
/* initialise list of ports */
INIT_LIST_HEAD(&adapter->port_list_head);
/* initialise list of ports to be removed */
INIT_LIST_HEAD(&adapter->port_remove_lh);
/* initialize list of fsf requests */
spin_lock_init(&adapter->req_list_lock);
if (zfcp_reqlist_alloc(adapter))
goto failed_low_mem_buffers;
/* initialize debug locks */
spin_lock_init(&adapter->hba_dbf_lock);
spin_lock_init(&adapter->san_dbf_lock);
spin_lock_init(&adapter->scsi_dbf_lock);
spin_lock_init(&adapter->rec_dbf_lock);
if (zfcp_adapter_debug_register(adapter))
goto debug_register_failed;
/* initialize error recovery stuff */
rwlock_init(&adapter->erp_lock);
sema_init(&adapter->erp_ready_sem, 0);
INIT_LIST_HEAD(&adapter->erp_ready_head);
INIT_LIST_HEAD(&adapter->erp_running_head);
/* initialize abort lock */
rwlock_init(&adapter->abort_lock);
/* initialise some erp stuff */
init_waitqueue_head(&adapter->erp_thread_wqh);
init_waitqueue_head(&adapter->erp_done_wqh);
/* initialize lock of associated request queue */
rwlock_init(&adapter->req_q.lock);
INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
/* mark adapter unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
dev_set_drvdata(&ccw_device->dev, adapter);
if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
goto sysfs_failed;
adapter->generic_services.parent = &adapter->ccw_device->dev;
adapter->generic_services.release = zfcp_dummy_release;
snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
"generic_services");
if (device_register(&adapter->generic_services))
goto generic_services_failed;
/* put allocated adapter at list tail */
write_lock_irq(&zfcp_data.config_lock);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
write_unlock_irq(&zfcp_data.config_lock);
zfcp_data.adapters++;
goto out;
generic_services_failed:
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
sysfs_failed:
zfcp_adapter_debug_unregister(adapter);
debug_register_failed:
dev_set_drvdata(&ccw_device->dev, NULL);
zfcp_reqlist_free(adapter);
failed_low_mem_buffers:
zfcp_free_low_mem_buffers(adapter);
qdio_allocate_failed:
zfcp_qdio_free(adapter);
kfree(adapter);
adapter = NULL;
out:
return adapter;
}
/*
* returns: 0 - struct zfcp_adapter data structure successfully removed
* !0 - struct zfcp_adapter data structure could not be removed
* (e.g. still used)
* locks: adapter list write lock is assumed to be held by caller
*/
void
zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
{
int retval = 0;
unsigned long flags;
cancel_work_sync(&adapter->stat_work);
zfcp_adapter_scsi_unregister(adapter);
device_unregister(&adapter->generic_services);
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
dev_set_drvdata(&adapter->ccw_device->dev, NULL);
/* sanity check: no pending FSF requests */
spin_lock_irqsave(&adapter->req_list_lock, flags);
retval = zfcp_reqlist_isempty(adapter);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
if (!retval) {
retval = -EBUSY;
goto out;
}
zfcp_adapter_debug_unregister(adapter);
/* remove specified adapter data structure from list */
write_lock_irq(&zfcp_data.config_lock);
list_del(&adapter->list);
write_unlock_irq(&zfcp_data.config_lock);
/* decrease number of adapters in list */
zfcp_data.adapters--;
zfcp_qdio_free(adapter);
zfcp_free_low_mem_buffers(adapter);
zfcp_reqlist_free(adapter);
kfree(adapter->fc_stats);
kfree(adapter->stats_reset_data);
ZFCP_LOG_TRACE("freeing adapter structure\n");
kfree(adapter);
out:
return;
}
/**
* zfcp_port_enqueue - enqueue port to port list of adapter
* @adapter: adapter where remote port is added
* @wwpn: WWPN of the remote port to be enqueued
* @status: initial status for the port
* @d_id: destination id of the remote port to be enqueued
* Return: pointer to enqueued port on success, NULL on error
* Locks: config_sema must be held to serialize changes to the port list
*
* All port internal structures are set up and the sysfs entry is generated.
* d_id is used to enqueue ports with a well known address like the Directory
* Service for nameserver lookup.
*/
struct zfcp_port *
zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
u32 d_id)
{
struct zfcp_port *port;
int check_wwpn;
check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
/*
* check that there is no port with this WWPN already in list
*/
if (check_wwpn) {
read_lock_irq(&zfcp_data.config_lock);
port = zfcp_get_port_by_wwpn(adapter, wwpn);
read_unlock_irq(&zfcp_data.config_lock);
if (port)
return NULL;
}
port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
if (!port)
return NULL;
/* initialise reference count stuff */
atomic_set(&port->refcount, 0);
init_waitqueue_head(&port->remove_wq);
INIT_LIST_HEAD(&port->unit_list_head);
INIT_LIST_HEAD(&port->unit_remove_lh);
port->adapter = adapter;
if (check_wwpn)
port->wwpn = wwpn;
atomic_set_mask(status, &port->status);
/* setup for sysfs registration */
if (status & ZFCP_STATUS_PORT_WKA) {
switch (d_id) {
case ZFCP_DID_DIRECTORY_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"directory");
break;
case ZFCP_DID_MANAGEMENT_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"management");
break;
case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"key_distribution");
break;
case ZFCP_DID_ALIAS_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"alias");
break;
case ZFCP_DID_TIME_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"time");
break;
default:
kfree(port);
return NULL;
}
port->d_id = d_id;
port->sysfs_device.parent = &adapter->generic_services;
} else {
snprintf(port->sysfs_device.bus_id,
BUS_ID_SIZE, "0x%016llx", wwpn);
port->sysfs_device.parent = &adapter->ccw_device->dev;
}
port->sysfs_device.release = zfcp_sysfs_port_release;
dev_set_drvdata(&port->sysfs_device, port);
/* mark port unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
if (device_register(&port->sysfs_device)) {
kfree(port);
return NULL;
}
if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
device_unregister(&port->sysfs_device);
return NULL;
}
zfcp_port_get(port);
write_lock_irq(&zfcp_data.config_lock);
list_add_tail(&port->list, &adapter->port_list_head);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
if (!adapter->nameserver_port)
adapter->nameserver_port = port;
adapter->ports++;
write_unlock_irq(&zfcp_data.config_lock);
zfcp_adapter_get(adapter);
return port;
}
void
zfcp_port_dequeue(struct zfcp_port *port)
{
zfcp_port_wait(port);
write_lock_irq(&zfcp_data.config_lock);
list_del(&port->list);
port->adapter->ports--;
write_unlock_irq(&zfcp_data.config_lock);
if (port->rport)
fc_remote_port_delete(port->rport);
port->rport = NULL;
zfcp_adapter_put(port->adapter);
zfcp_sysfs_port_remove_files(&port->sysfs_device,
atomic_read(&port->status));
device_unregister(&port->sysfs_device);
}
/* Enqueues a nameserver port */
int
zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
{
struct zfcp_port *port;
port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
ZFCP_DID_DIRECTORY_SERVICE);
if (!port) {
ZFCP_LOG_INFO("error: enqueue of nameserver port for "
"adapter %s failed\n",
zfcp_get_busid_by_adapter(adapter));
return -ENXIO;
}
zfcp_port_put(port);
return 0;
}
void zfcp_sg_free_table(struct scatterlist *sg, int count)
{
int i;
for (i = 0; i < count; i++, sg++)
if (sg)
free_page((unsigned long) sg_virt(sg));
else
break;
}
int zfcp_sg_setup_table(struct scatterlist *sg, int count)
{
void *addr;
int i;
sg_init_table(sg, count);
for (i = 0; i < count; i++, sg++) {
addr = (void *) get_zeroed_page(GFP_KERNEL);
if (!addr) {
zfcp_sg_free_table(sg, i);
return -ENOMEM;
}
sg_set_buf(sg, addr, PAGE_SIZE);
}
return 0;
}
#undef ZFCP_LOG_AREA
