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[SCSI] zfcp: Cleanup of code in zfcp_aux.c 

Overall cleanup of zfcp_aux.c to simplify code and follow kernel
coding style.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Swen Schillig 2008-07-02 10:56:37 +02:00 committed by James Bottomley
parent f76af7d7e3
commit 317e6b6519
7 changed files with 242 additions and 392 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

591
drivers/s390/scsi/zfcp_aux.c
View File

@ -29,48 +29,14 @@
#include "zfcp_ext.h"
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_DESCRIPTION("FCP HBA driver");
MODULE_LICENSE("GPL");
module_param(device, charp, 0400);
MODULE_PARM_DESC(device, "specify initial device");
/****************************************************************/
/************** 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 ********/
/****************************************************************/
static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
{
int idx;
@ -85,11 +51,12 @@ static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
return 0;
}
static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
{
kfree(adapter->req_list);
}
/**
* zfcp_reqlist_isempty - is the request list empty
* @adapter: pointer to struct zfcp_adapter
*
* Returns: true if list is empty, false otherwise
*/
int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
{
unsigned int idx;
@ -100,62 +67,58 @@ int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
return 1;
}
/****************************************************************/
/************** Uncategorised Functions *************************/
/****************************************************************/
/**
* zfcp_device_setup - setup function
* @str: pointer to parameter string
*
* Parse "device=..." parameter string.
*/
static int __init
zfcp_device_setup(char *devstr)
static int __init zfcp_device_setup(char *devstr)
{
char *tmp, *str;
size_t len;
char *token;
char *str;
if (!devstr)
return 0;
len = strlen(devstr) + 1;
str = kmalloc(len, GFP_KERNEL);
if (!str) {
pr_err("zfcp: Could not allocate memory for "
"device parameter string, device not attached.\n");
/* duplicate devstr and keep the original for sysfs presentation*/
str = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
if (!str)
return 0;
}
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';
strcpy(str, devstr);
zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
if (*tmp++ != ',')
token = strsep(&str, ",");
if (!token || strlen(token) >= BUS_ID_SIZE)
goto err_out;
if (*tmp == '\0')
strncpy(zfcp_data.init_busid, token, BUS_ID_SIZE);
token = strsep(&str, ",");
if (!token || strict_strtoull(token, 0, &zfcp_data.init_wwpn))
goto err_out;
zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
if (*tmp != '\0')
token = strsep(&str, ",");
if (!token || strict_strtoull(token, 0, &zfcp_data.init_fcp_lun))
goto err_out;
kfree(str);
return 1;
err_out:
pr_err("zfcp: Parse error for device parameter string %s, "
"device not attached.\n", str);
kfree(str);
pr_err("zfcp: Parse error for device parameter string %s, "
"device not attached.\n", devstr);
return 0;
}
static void __init
zfcp_init_device_configure(void)
static struct zfcp_adapter *zfcp_get_adapter_by_busid(char *bus_id)
{
struct zfcp_adapter *adapter;
list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list)
if ((strncmp(bus_id, adapter->ccw_device->dev.bus_id,
BUS_ID_SIZE) == 0) &&
!(atomic_read(&adapter->status) &
ZFCP_STATUS_COMMON_REMOVE))
return adapter;
return NULL;
}
static void __init zfcp_init_device_configure(void)
{
struct zfcp_adapter *adapter;
struct zfcp_port *port;
@ -168,92 +131,72 @@ zfcp_init_device_configure(void)
zfcp_adapter_get(adapter);
read_unlock_irq(&zfcp_data.config_lock);
if (adapter == NULL)
if (!adapter)
goto out_adapter;
port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
if (!port)
if (IS_ERR(port))
goto out_port;
unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
if (!unit)
if (IS_ERR(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:
out_unit:
zfcp_port_put(port);
out_port:
out_port:
zfcp_adapter_put(adapter);
out_adapter:
out_adapter:
up(&zfcp_data.config_sema);
return;
}
static int calc_alignment(int size)
static struct kmem_cache *zfcp_cache_create(int size, char *name)
{
int align = 1;
if (!size)
return 0;
while ((size - align) > 0)
align <<= 1;
return align;
return kmem_cache_create(name , size, align, 0, NULL);
}
static int __init
zfcp_module_init(void)
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);
zfcp_data.fsf_req_qtcb_cache = zfcp_cache_create(
sizeof(struct zfcp_fsf_req_qtcb), "zfcp_fsf");
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);
zfcp_data.sr_buffer_cache = zfcp_cache_create(
sizeof(struct fsf_status_read_buffer), "zfcp_sr");
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);
zfcp_data.gid_pn_cache = zfcp_cache_create(
sizeof(struct zfcp_gid_pn_data), "zfcp_gid");
if (!zfcp_data.gid_pn_cache)
goto out_gid_cache;
/* 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);
sema_init(&zfcp_data.config_sema, 1);
rwlock_init(&zfcp_data.config_lock);
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) {
if (retval) {
pr_err("zfcp: 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) {
pr_err("zfcp: Registration with common I/O layer failed.\n");
@ -265,157 +208,83 @@ zfcp_module_init(void)
goto out;
out_ccw_register:
out_ccw_register:
misc_deregister(&zfcp_cfdc_misc);
out_misc:
out_misc:
fc_release_transport(zfcp_data.scsi_transport_template);
out_transport:
out_transport:
kmem_cache_destroy(zfcp_data.gid_pn_cache);
out_gid_cache:
out_gid_cache:
kmem_cache_destroy(zfcp_data.sr_buffer_cache);
out_sr_cache:
out_sr_cache:
kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
out:
out:
return retval;
}
/****************************************************************/
/****** Functions for configuration/set-up of structures ********/
/****************************************************************/
module_init(zfcp_module_init);
/**
* 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.
*
* Returns: pointer to zfcp_unit or NULL
*/
struct zfcp_unit *
zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t 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) {
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;
!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE))
return unit;
return 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.
*
* Returns: pointer to zfcp_port or NULL
*/
struct zfcp_port *
zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t 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;
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)))
return port;
return 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
* Returns: pointer to enqueued unit on success, ERR_PTR 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 *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);
unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
if (!unit)
return NULL;
return ERR_PTR(-ENOMEM);
/* 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;
@ -432,14 +301,19 @@ zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
unit->latencies.cmd.channel.min = 0xFFFFFFFF;
unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
if (device_register(&unit->sysfs_device)) {
kfree(unit);
return NULL;
read_lock_irq(&zfcp_data.config_lock);
if (zfcp_get_unit_by_lun(port, fcp_lun)) {
read_unlock_irq(&zfcp_data.config_lock);
goto err_out_free;
}
read_unlock_irq(&zfcp_data.config_lock);
if (device_register(&unit->sysfs_device))
goto err_out_free;
if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
device_unregister(&unit->sysfs_device);
return NULL;
return ERR_PTR(-EIO);
}
zfcp_unit_get(unit);
@ -449,16 +323,27 @@ zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
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;
err_out_free:
kfree(unit);
return ERR_PTR(-EINVAL);
}
void
zfcp_unit_dequeue(struct zfcp_unit *unit)
/**
* zfcp_unit_dequeue - dequeue unit
* @unit: pointer to zfcp_unit
*
* waits until all work is done on unit and removes it then from the unit->list
* of the associated port.
*/
void zfcp_unit_dequeue(struct zfcp_unit *unit)
{
zfcp_unit_wait(unit);
write_lock_irq(&zfcp_data.config_lock);
@ -470,64 +355,47 @@ zfcp_unit_dequeue(struct zfcp_unit *unit)
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)
static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
/* must only be called with zfcp_data.config_sema taken */
adapter->pool.fsf_req_erp =
mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
zfcp_data.fsf_req_qtcb_cache);
mempool_create_slab_pool(1, 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);
mempool_create_slab_pool(1, 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);
mempool_create_slab_pool(1, 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,
mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
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,
mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
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);
mempool_create_slab_pool(1, 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)
static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
{
/* zfcp_data.config_sema must be held */
if (adapter->pool.fsf_req_erp)
mempool_destroy(adapter->pool.fsf_req_erp);
if (adapter->pool.fsf_req_scsi)
@ -547,6 +415,15 @@ static void zfcp_dummy_release(struct device *dev)
return;
}
/**
* zfcp_status_read_refill - refill the long running status_read_requests
* @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
*
* Returns: 0 on success, 1 otherwise
*
* if there are 16 or more status_read requests missing an adapter_reopen
* is triggered
*/
int zfcp_status_read_refill(struct zfcp_adapter *adapter)
{
while (atomic_read(&adapter->stat_miss) > 0)
@ -573,27 +450,25 @@ static int zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
ZFCP_DID_DIRECTORY_SERVICE);
if (!port)
return -ENXIO;
if (IS_ERR(port))
return PTR_ERR(port);
zfcp_port_put(port);
return 0;
}
/*
/**
* zfcp_adapter_enqueue - enqueue a new adapter to the list
* @ccw_device: pointer to the struct cc_device
*
* Returns: 0 if a new adapter was successfully enqueued
* -ENOMEM if alloc failed
* 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.
*
* FIXME: Use -ENOMEM as return code for allocation failures
*
* 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)
int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
{
struct zfcp_adapter *adapter;
@ -602,15 +477,13 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
* 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);
adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
if (!adapter)
goto out;
return -ENOMEM;
ccw_device->handler = NULL;
/* save ccw_device pointer */
adapter->ccw_device = ccw_device;
atomic_set(&adapter->refcount, 0);
if (zfcp_qdio_allocate(adapter))
goto qdio_allocate_failed;
@ -618,47 +491,34 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
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 */
if (zfcp_adapter_debug_register(adapter))
goto debug_register_failed;
init_waitqueue_head(&adapter->remove_wq);
init_waitqueue_head(&adapter->erp_thread_wqh);
init_waitqueue_head(&adapter->erp_done_wqh);
INIT_LIST_HEAD(&adapter->port_list_head);
INIT_LIST_HEAD(&adapter->port_remove_lh);
INIT_LIST_HEAD(&adapter->erp_ready_head);
INIT_LIST_HEAD(&adapter->erp_running_head);
spin_lock_init(&adapter->req_list_lock);
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);
sema_init(&adapter->erp_ready_sem, 0);
INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
INIT_WORK(&adapter->scan_work, _zfcp_scan_ports_later);
@ -678,7 +538,6 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
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);
@ -688,33 +547,29 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
zfcp_nameserver_enqueue(adapter);
goto out;
return 0;
generic_services_failed:
generic_services_failed:
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
sysfs_failed:
sysfs_failed:
zfcp_adapter_debug_unregister(adapter);
debug_register_failed:
debug_register_failed:
dev_set_drvdata(&ccw_device->dev, NULL);
zfcp_reqlist_free(adapter);
failed_low_mem_buffers:
kfree(adapter->req_list);
failed_low_mem_buffers:
zfcp_free_low_mem_buffers(adapter);
qdio_allocate_failed:
qdio_allocate_failed:
zfcp_qdio_free(adapter);
kfree(adapter);
adapter = NULL;
out:
return adapter;
return -ENOMEM;
}
/*
* returns: 0 - struct zfcp_adapter data structure successfully removed
* !0 - struct zfcp_adapter data structure could not be removed
* (e.g. still used)
/**
* zfcp_adapter_dequeue - remove the adapter from the resource list
* @adapter: pointer to struct zfcp_adapter which should be removed
* locks: adapter list write lock is assumed to be held by caller
*/
void
zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
{
int retval = 0;
unsigned long flags;
@ -729,10 +584,8 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
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;
}
if (!retval)
return;
zfcp_adapter_debug_unregister(adapter);
@ -747,12 +600,10 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
zfcp_qdio_free(adapter);
zfcp_free_low_mem_buffers(adapter);
zfcp_reqlist_free(adapter);
kfree(adapter->req_list);
kfree(adapter->fc_stats);
kfree(adapter->stats_reset_data);
kfree(adapter);
out:
return;
}
/**
@ -761,77 +612,58 @@ zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
* @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
* Returns: pointer to enqueued port on success, ERR_PTR 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 *zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn,
u32 status, u32 d_id)
{
struct zfcp_port *port;
int check_wwpn;
char *bus_id;
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);
port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
if (!port)
return NULL;
return ERR_PTR(-ENOMEM);
/* 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;
port->d_id = d_id;
port->wwpn = wwpn;
if (check_wwpn)
port->wwpn = wwpn;
/* mark port unusable as long as sysfs registration is not complete */
atomic_set_mask(status | ZFCP_STATUS_COMMON_REMOVE, &port->status);
atomic_set(&port->refcount, 0);
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");
bus_id = "directory";
break;
case ZFCP_DID_MANAGEMENT_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"management");
bus_id = "management";
break;
case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"key_distribution");
bus_id = "key_distribution";
break;
case ZFCP_DID_ALIAS_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"alias");
bus_id = "alias";
break;
case ZFCP_DID_TIME_SERVICE:
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
"time");
bus_id = "time";
break;
default:
kfree(port);
return NULL;
return ERR_PTR(-EINVAL);
}
snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE, "%s", bus_id);
port->sysfs_device.parent = &adapter->generic_services;
} else {
snprintf(port->sysfs_device.bus_id,
@ -839,22 +671,23 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
port->sysfs_device.parent = &adapter->ccw_device->dev;
}
port->d_id = d_id;
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);
read_lock_irq(&zfcp_data.config_lock);
if (!(status & ZFCP_STATUS_PORT_NO_WWPN))
if (zfcp_get_port_by_wwpn(adapter, wwpn)) {
read_unlock_irq(&zfcp_data.config_lock);
goto err_out_free;
}
read_unlock_irq(&zfcp_data.config_lock);
if (device_register(&port->sysfs_device)) {
kfree(port);
return NULL;
}
if (device_register(&port->sysfs_device))
goto err_out_free;
if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
device_unregister(&port->sysfs_device);
return NULL;
goto err_out;
}
zfcp_port_get(port);
@ -867,15 +700,23 @@ zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
if (!adapter->nameserver_port)
adapter->nameserver_port = port;
adapter->ports++;
write_unlock_irq(&zfcp_data.config_lock);
zfcp_adapter_get(adapter);
return port;
err_out_free:
kfree(port);
err_out:
return ERR_PTR(-EINVAL);
}
void
zfcp_port_dequeue(struct zfcp_port *port)
/**
* zfcp_port_dequeue - dequeues a port from the port list of the adapter
* @port: pointer to struct zfcp_port which should be removed
*/
void zfcp_port_dequeue(struct zfcp_port *port)
{
zfcp_port_wait(port);
write_lock_irq(&zfcp_data.config_lock);
@ -891,6 +732,12 @@ zfcp_port_dequeue(struct zfcp_port *port)
device_unregister(&port->sysfs_device);
}
/**
* zfcp_sg_free_table - free memory used by scatterlists
* @sg: pointer to scatterlist
* @count: number of scatterlist which are to be free'ed
* the scatterlist are expected to reference pages always
*/
void zfcp_sg_free_table(struct scatterlist *sg, int count)
{
int i;
@ -902,6 +749,14 @@ void zfcp_sg_free_table(struct scatterlist *sg, int count)
break;
}
/**
* zfcp_sg_setup_table - init scatterlist and allocate, assign buffers
* @sg: pointer to struct scatterlist
* @count: number of scatterlists which should be assigned with buffers
* of size page
*
* Returns: 0 on success, -ENOMEM otherwise
*/
int zfcp_sg_setup_table(struct scatterlist *sg, int count)
{
void *addr;

4
drivers/s390/scsi/zfcp_ccw.c
View File

@ -20,12 +20,10 @@
*/
static int zfcp_ccw_probe(struct ccw_device *ccw_device)
{
struct zfcp_adapter *adapter;
int retval = 0;
down(&zfcp_data.config_sema);
adapter = zfcp_adapter_enqueue(ccw_device);
if (!adapter) {
if (zfcp_adapter_enqueue(ccw_device)) {
dev_err(&ccw_device->dev,
"Setup of data structures failed.\n");
retval = -EINVAL;

13
drivers/s390/scsi/zfcp_def.h
View File

@ -730,13 +730,6 @@ struct zfcp_data {
struct kmem_cache *gid_pn_cache;
};
/* number of elements for various memory pools */
#define ZFCP_POOL_FSF_REQ_ERP_NR 1
#define ZFCP_POOL_FSF_REQ_SCSI_NR 1
#define ZFCP_POOL_FSF_REQ_ABORT_NR 1
#define ZFCP_POOL_STATUS_READ_NR FSF_STATUS_READS_RECOM
#define ZFCP_POOL_DATA_GID_PN_NR 1
/* struct used by memory pools for fsf_requests */
struct zfcp_fsf_req_qtcb {
struct zfcp_fsf_req fsf_req;
@ -757,12 +750,6 @@ struct zfcp_fsf_req_qtcb {
((atomic_read(target) & mask) == mask)
#endif
extern void _zfcp_hex_dump(char *, int);
#define ZFCP_HEX_DUMP(level, addr, count) \
if (ZFCP_LOG_CHECK(level)) { \
_zfcp_hex_dump(addr, count); \
}
#define zfcp_get_busid_by_adapter(adapter) (adapter->ccw_device->dev.bus_id)
#define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
#define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))

2
drivers/s390/scsi/zfcp_erp.c
View File

@ -1675,7 +1675,7 @@ static void zfcp_erp_open_ptp_port(struct zfcp_adapter *adapter)
struct zfcp_port *port;
port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
adapter->peer_d_id);
if (!port) /* error or port already attached */
if (IS_ERR(port)) /* error or port already attached */
return;
zfcp_erp_port_reopen_internal(port, 0, 150, NULL);
}

4
drivers/s390/scsi/zfcp_ext.h
View File

@ -26,9 +26,7 @@ extern void zfcp_sysfs_unit_release(struct device *);
/**************************** CONFIGURATION *********************************/
extern struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *, fcp_lun_t);
extern struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *, wwn_t);
extern struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *, u32);
struct zfcp_adapter *zfcp_get_adapter_by_busid(char *);
extern struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *);
extern int zfcp_adapter_enqueue(struct ccw_device *);
extern int zfcp_adapter_debug_register(struct zfcp_adapter *);
extern void zfcp_adapter_dequeue(struct zfcp_adapter *);
extern void zfcp_adapter_debug_unregister(struct zfcp_adapter *);

18
drivers/s390/scsi/zfcp_fc.c
View File

@ -39,6 +39,18 @@ struct zfcp_gpn_ft {
struct scatterlist sg_resp[ZFCP_GPN_FT_BUFFERS];
};
static struct zfcp_port *zfcp_get_port_by_did(struct zfcp_adapter *adapter,
u32 d_id)
{
struct zfcp_port *port;
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))
return port;
return NULL;
}
static void _zfcp_fc_incoming_rscn(struct zfcp_fsf_req *fsf_req, u32 range,
struct fcp_rscn_element *elem)
{
@ -496,10 +508,10 @@ static int zfcp_scan_eval_gpn_ft(struct zfcp_gpn_ft *gpn_ft)
port = zfcp_port_enqueue(adapter, acc->wwpn,
ZFCP_STATUS_PORT_DID_DID |
ZFCP_STATUS_COMMON_NOESC, d_id);
if (port)
zfcp_erp_port_reopen(port, 0, 149, NULL);
if (IS_ERR(port))
ret = PTR_ERR(port);
else
ret = -ENOMEM;
zfcp_erp_port_reopen(port, 0, 149, NULL);
if (acc->control & 0x80) /* last entry */
break;
}

2
drivers/s390/scsi/zfcp_sysfs_port.c
View File

@ -74,7 +74,7 @@ zfcp_sysfs_unit_add_store(struct device *dev, struct device_attribute *attr, con
goto out;
unit = zfcp_unit_enqueue(port, fcp_lun);
if (!unit)
if (IS_ERR(unit))
goto out;
retval = 0;