781 lines
21 KiB
C
781 lines
21 KiB
C
/*
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* zfcp device driver
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*
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* Module interface and handling of zfcp data structures.
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*
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* Copyright IBM Corporation 2002, 2009
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*/
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/*
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* Driver authors:
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* Martin Peschke (originator of the driver)
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* Raimund Schroeder
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* Aron Zeh
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* Wolfgang Taphorn
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* Stefan Bader
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* Heiko Carstens (kernel 2.6 port of the driver)
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* Andreas Herrmann
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* Maxim Shchetynin
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* Volker Sameske
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* Ralph Wuerthner
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* Michael Loehr
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* Swen Schillig
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* Christof Schmitt
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* Martin Petermann
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* Sven Schuetz
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/miscdevice.h>
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#include <linux/seq_file.h>
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#include "zfcp_ext.h"
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#define ZFCP_BUS_ID_SIZE 20
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MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
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MODULE_DESCRIPTION("FCP HBA driver");
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MODULE_LICENSE("GPL");
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static char *init_device;
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module_param_named(device, init_device, charp, 0400);
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MODULE_PARM_DESC(device, "specify initial device");
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static struct kmem_cache *zfcp_cache_hw_align(const char *name,
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unsigned long size)
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{
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return kmem_cache_create(name, size, roundup_pow_of_two(size), 0, NULL);
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}
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static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
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{
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int idx;
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adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
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GFP_KERNEL);
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if (!adapter->req_list)
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return -ENOMEM;
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for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
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INIT_LIST_HEAD(&adapter->req_list[idx]);
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return 0;
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}
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/**
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* zfcp_reqlist_isempty - is the request list empty
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* @adapter: pointer to struct zfcp_adapter
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*
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* Returns: true if list is empty, false otherwise
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*/
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int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
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{
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unsigned int idx;
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for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
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if (!list_empty(&adapter->req_list[idx]))
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return 0;
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return 1;
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}
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static void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun)
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{
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struct ccw_device *ccwdev;
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struct zfcp_adapter *adapter;
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struct zfcp_port *port;
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struct zfcp_unit *unit;
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ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
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if (!ccwdev)
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return;
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if (ccw_device_set_online(ccwdev))
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goto out_ccwdev;
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mutex_lock(&zfcp_data.config_mutex);
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adapter = dev_get_drvdata(&ccwdev->dev);
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if (!adapter)
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goto out_unlock;
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zfcp_adapter_get(adapter);
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port = zfcp_get_port_by_wwpn(adapter, wwpn);
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if (!port)
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goto out_port;
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zfcp_port_get(port);
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unit = zfcp_unit_enqueue(port, lun);
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if (IS_ERR(unit))
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goto out_unit;
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mutex_unlock(&zfcp_data.config_mutex);
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zfcp_erp_unit_reopen(unit, 0, "auidc_1", NULL);
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zfcp_erp_wait(adapter);
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flush_work(&unit->scsi_work);
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mutex_lock(&zfcp_data.config_mutex);
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zfcp_unit_put(unit);
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out_unit:
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zfcp_port_put(port);
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out_port:
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zfcp_adapter_put(adapter);
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out_unlock:
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mutex_unlock(&zfcp_data.config_mutex);
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out_ccwdev:
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put_device(&ccwdev->dev);
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return;
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}
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static void __init zfcp_init_device_setup(char *devstr)
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{
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char *token;
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char *str, *str_saved;
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char busid[ZFCP_BUS_ID_SIZE];
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u64 wwpn, lun;
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/* duplicate devstr and keep the original for sysfs presentation*/
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str_saved = kmalloc(strlen(devstr) + 1, GFP_KERNEL);
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str = str_saved;
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if (!str)
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return;
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strcpy(str, devstr);
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token = strsep(&str, ",");
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if (!token || strlen(token) >= ZFCP_BUS_ID_SIZE)
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goto err_out;
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strncpy(busid, token, ZFCP_BUS_ID_SIZE);
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token = strsep(&str, ",");
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if (!token || strict_strtoull(token, 0, (unsigned long long *) &wwpn))
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goto err_out;
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token = strsep(&str, ",");
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if (!token || strict_strtoull(token, 0, (unsigned long long *) &lun))
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goto err_out;
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kfree(str_saved);
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zfcp_init_device_configure(busid, wwpn, lun);
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return;
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err_out:
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kfree(str_saved);
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pr_err("%s is not a valid SCSI device\n", devstr);
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}
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static int __init zfcp_module_init(void)
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{
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int retval = -ENOMEM;
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zfcp_data.gpn_ft_cache = zfcp_cache_hw_align("zfcp_gpn",
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sizeof(struct ct_iu_gpn_ft_req));
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if (!zfcp_data.gpn_ft_cache)
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goto out;
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zfcp_data.qtcb_cache = zfcp_cache_hw_align("zfcp_qtcb",
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sizeof(struct fsf_qtcb));
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if (!zfcp_data.qtcb_cache)
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goto out_qtcb_cache;
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zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
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sizeof(struct fsf_status_read_buffer));
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if (!zfcp_data.sr_buffer_cache)
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goto out_sr_cache;
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zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
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sizeof(struct zfcp_gid_pn_data));
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if (!zfcp_data.gid_pn_cache)
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goto out_gid_cache;
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mutex_init(&zfcp_data.config_mutex);
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zfcp_data.scsi_transport_template =
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fc_attach_transport(&zfcp_transport_functions);
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if (!zfcp_data.scsi_transport_template)
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goto out_transport;
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retval = misc_register(&zfcp_cfdc_misc);
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if (retval) {
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pr_err("Registering the misc device zfcp_cfdc failed\n");
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goto out_misc;
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}
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retval = zfcp_ccw_register();
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if (retval) {
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pr_err("The zfcp device driver could not register with "
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"the common I/O layer\n");
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goto out_ccw_register;
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}
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if (init_device)
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zfcp_init_device_setup(init_device);
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return 0;
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out_ccw_register:
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misc_deregister(&zfcp_cfdc_misc);
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out_misc:
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fc_release_transport(zfcp_data.scsi_transport_template);
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out_transport:
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kmem_cache_destroy(zfcp_data.gid_pn_cache);
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out_gid_cache:
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kmem_cache_destroy(zfcp_data.sr_buffer_cache);
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out_sr_cache:
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kmem_cache_destroy(zfcp_data.qtcb_cache);
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out_qtcb_cache:
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kmem_cache_destroy(zfcp_data.gpn_ft_cache);
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out:
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return retval;
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}
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module_init(zfcp_module_init);
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/**
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* zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
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* @port: pointer to port to search for unit
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* @fcp_lun: FCP LUN to search for
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*
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* Returns: pointer to zfcp_unit or NULL
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*/
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struct zfcp_unit *zfcp_get_unit_by_lun(struct zfcp_port *port, u64 fcp_lun)
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{
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unsigned long flags;
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struct zfcp_unit *unit;
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read_lock_irqsave(&port->unit_list_lock, flags);
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list_for_each_entry(unit, &port->unit_list, list)
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if ((unit->fcp_lun == fcp_lun) &&
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!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_REMOVE)) {
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zfcp_unit_get(unit);
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read_unlock_irqrestore(&port->unit_list_lock, flags);
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return unit;
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}
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read_unlock_irqrestore(&port->unit_list_lock, flags);
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return NULL;
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}
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/**
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* zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
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* @adapter: pointer to adapter to search for port
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* @wwpn: wwpn to search for
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*
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* Returns: pointer to zfcp_port or NULL
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*/
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struct zfcp_port *zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter,
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u64 wwpn)
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{
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unsigned long flags;
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struct zfcp_port *port;
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read_lock_irqsave(&adapter->port_list_lock, flags);
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list_for_each_entry(port, &adapter->port_list, list)
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if ((port->wwpn == wwpn) &&
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!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_REMOVE)) {
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zfcp_port_get(port);
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read_unlock_irqrestore(&adapter->port_list_lock, flags);
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return port;
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}
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read_unlock_irqrestore(&adapter->port_list_lock, flags);
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return NULL;
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}
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static void zfcp_sysfs_unit_release(struct device *dev)
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{
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kfree(container_of(dev, struct zfcp_unit, sysfs_device));
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}
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/**
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* zfcp_unit_enqueue - enqueue unit to unit list of a port.
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* @port: pointer to port where unit is added
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* @fcp_lun: FCP LUN of unit to be enqueued
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* Returns: pointer to enqueued unit on success, ERR_PTR on error
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* Locks: config_mutex must be held to serialize changes to the unit list
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*
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* Sets up some unit internal structures and creates sysfs entry.
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*/
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struct zfcp_unit *zfcp_unit_enqueue(struct zfcp_port *port, u64 fcp_lun)
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{
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struct zfcp_unit *unit;
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unit = zfcp_get_unit_by_lun(port, fcp_lun);
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if (unit) {
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zfcp_unit_put(unit);
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return ERR_PTR(-EINVAL);
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}
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unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
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if (!unit)
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return ERR_PTR(-ENOMEM);
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atomic_set(&unit->refcount, 0);
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init_waitqueue_head(&unit->remove_wq);
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INIT_WORK(&unit->scsi_work, zfcp_scsi_scan);
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unit->port = port;
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unit->fcp_lun = fcp_lun;
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if (dev_set_name(&unit->sysfs_device, "0x%016llx",
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(unsigned long long) fcp_lun)) {
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kfree(unit);
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return ERR_PTR(-ENOMEM);
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}
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unit->sysfs_device.parent = &port->sysfs_device;
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unit->sysfs_device.release = zfcp_sysfs_unit_release;
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dev_set_drvdata(&unit->sysfs_device, unit);
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/* mark unit unusable as long as sysfs registration is not complete */
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atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
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spin_lock_init(&unit->latencies.lock);
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unit->latencies.write.channel.min = 0xFFFFFFFF;
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unit->latencies.write.fabric.min = 0xFFFFFFFF;
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unit->latencies.read.channel.min = 0xFFFFFFFF;
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unit->latencies.read.fabric.min = 0xFFFFFFFF;
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unit->latencies.cmd.channel.min = 0xFFFFFFFF;
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unit->latencies.cmd.fabric.min = 0xFFFFFFFF;
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if (device_register(&unit->sysfs_device)) {
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put_device(&unit->sysfs_device);
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return ERR_PTR(-EINVAL);
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}
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if (sysfs_create_group(&unit->sysfs_device.kobj,
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&zfcp_sysfs_unit_attrs)) {
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device_unregister(&unit->sysfs_device);
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return ERR_PTR(-EINVAL);
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}
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zfcp_unit_get(unit);
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write_lock_irq(&port->unit_list_lock);
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list_add_tail(&unit->list, &port->unit_list);
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write_unlock_irq(&port->unit_list_lock);
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atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
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atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
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zfcp_port_get(port);
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return unit;
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}
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/**
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* zfcp_unit_dequeue - dequeue unit
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* @unit: pointer to zfcp_unit
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*
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* waits until all work is done on unit and removes it then from the unit->list
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* of the associated port.
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*/
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void zfcp_unit_dequeue(struct zfcp_unit *unit)
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{
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struct zfcp_port *port = unit->port;
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wait_event(unit->remove_wq, atomic_read(&unit->refcount) == 0);
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list_del(&unit->list); /* no list locking required */
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zfcp_port_put(port);
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sysfs_remove_group(&unit->sysfs_device.kobj, &zfcp_sysfs_unit_attrs);
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device_unregister(&unit->sysfs_device);
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}
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static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
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{
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/* must only be called with zfcp_data.config_mutex taken */
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adapter->pool.erp_req =
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mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.erp_req)
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return -ENOMEM;
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adapter->pool.gid_pn_req =
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mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.gid_pn_req)
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return -ENOMEM;
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adapter->pool.scsi_req =
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mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.scsi_req)
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return -ENOMEM;
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adapter->pool.scsi_abort =
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mempool_create_kmalloc_pool(1, sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.scsi_abort)
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return -ENOMEM;
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adapter->pool.status_read_req =
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mempool_create_kmalloc_pool(FSF_STATUS_READS_RECOM,
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sizeof(struct zfcp_fsf_req));
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if (!adapter->pool.status_read_req)
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return -ENOMEM;
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adapter->pool.qtcb_pool =
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mempool_create_slab_pool(4, zfcp_data.qtcb_cache);
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if (!adapter->pool.qtcb_pool)
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return -ENOMEM;
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adapter->pool.status_read_data =
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mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
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zfcp_data.sr_buffer_cache);
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if (!adapter->pool.status_read_data)
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return -ENOMEM;
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adapter->pool.gid_pn_data =
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mempool_create_slab_pool(1, zfcp_data.gid_pn_cache);
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if (!adapter->pool.gid_pn_data)
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return -ENOMEM;
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return 0;
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}
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static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
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{
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/* zfcp_data.config_mutex must be held */
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if (adapter->pool.erp_req)
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mempool_destroy(adapter->pool.erp_req);
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if (adapter->pool.scsi_req)
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mempool_destroy(adapter->pool.scsi_req);
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if (adapter->pool.scsi_abort)
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mempool_destroy(adapter->pool.scsi_abort);
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if (adapter->pool.qtcb_pool)
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mempool_destroy(adapter->pool.qtcb_pool);
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if (adapter->pool.status_read_req)
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mempool_destroy(adapter->pool.status_read_req);
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if (adapter->pool.status_read_data)
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mempool_destroy(adapter->pool.status_read_data);
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if (adapter->pool.gid_pn_data)
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mempool_destroy(adapter->pool.gid_pn_data);
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}
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/**
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* zfcp_status_read_refill - refill the long running status_read_requests
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* @adapter: ptr to struct zfcp_adapter for which the buffers should be refilled
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*
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* Returns: 0 on success, 1 otherwise
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*
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* if there are 16 or more status_read requests missing an adapter_reopen
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* is triggered
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*/
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int zfcp_status_read_refill(struct zfcp_adapter *adapter)
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{
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while (atomic_read(&adapter->stat_miss) > 0)
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if (zfcp_fsf_status_read(adapter->qdio)) {
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if (atomic_read(&adapter->stat_miss) >= 16) {
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zfcp_erp_adapter_reopen(adapter, 0, "axsref1",
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NULL);
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return 1;
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}
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break;
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} else
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atomic_dec(&adapter->stat_miss);
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return 0;
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}
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static void _zfcp_status_read_scheduler(struct work_struct *work)
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{
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zfcp_status_read_refill(container_of(work, struct zfcp_adapter,
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stat_work));
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}
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static void zfcp_print_sl(struct seq_file *m, struct service_level *sl)
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{
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struct zfcp_adapter *adapter =
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container_of(sl, struct zfcp_adapter, service_level);
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seq_printf(m, "zfcp: %s microcode level %x\n",
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dev_name(&adapter->ccw_device->dev),
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adapter->fsf_lic_version);
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}
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static int zfcp_setup_adapter_work_queue(struct zfcp_adapter *adapter)
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{
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char name[TASK_COMM_LEN];
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snprintf(name, sizeof(name), "zfcp_q_%s",
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dev_name(&adapter->ccw_device->dev));
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adapter->work_queue = create_singlethread_workqueue(name);
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if (adapter->work_queue)
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|
return 0;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter)
|
|
{
|
|
if (adapter->work_queue)
|
|
destroy_workqueue(adapter->work_queue);
|
|
adapter->work_queue = NULL;
|
|
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
* locks: config_mutex must be held to serialize changes to the adapter list
|
|
*/
|
|
int 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_mutex, which must be held to get here
|
|
*/
|
|
|
|
adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL);
|
|
if (!adapter)
|
|
return -ENOMEM;
|
|
|
|
ccw_device->handler = NULL;
|
|
adapter->ccw_device = ccw_device;
|
|
atomic_set(&adapter->refcount, 0);
|
|
|
|
if (zfcp_qdio_setup(adapter))
|
|
goto qdio_failed;
|
|
|
|
if (zfcp_allocate_low_mem_buffers(adapter))
|
|
goto low_mem_buffers_failed;
|
|
|
|
if (zfcp_reqlist_alloc(adapter))
|
|
goto low_mem_buffers_failed;
|
|
|
|
if (zfcp_dbf_adapter_register(adapter))
|
|
goto debug_register_failed;
|
|
|
|
if (zfcp_setup_adapter_work_queue(adapter))
|
|
goto work_queue_failed;
|
|
|
|
if (zfcp_fc_gs_setup(adapter))
|
|
goto generic_services_failed;
|
|
|
|
rwlock_init(&adapter->port_list_lock);
|
|
INIT_LIST_HEAD(&adapter->port_list);
|
|
|
|
init_waitqueue_head(&adapter->remove_wq);
|
|
init_waitqueue_head(&adapter->erp_ready_wq);
|
|
init_waitqueue_head(&adapter->erp_done_wqh);
|
|
|
|
INIT_LIST_HEAD(&adapter->erp_ready_head);
|
|
INIT_LIST_HEAD(&adapter->erp_running_head);
|
|
|
|
spin_lock_init(&adapter->req_list_lock);
|
|
|
|
rwlock_init(&adapter->erp_lock);
|
|
rwlock_init(&adapter->abort_lock);
|
|
|
|
if (zfcp_erp_thread_setup(adapter))
|
|
goto erp_thread_failed;
|
|
|
|
INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler);
|
|
INIT_WORK(&adapter->scan_work, _zfcp_fc_scan_ports_later);
|
|
|
|
adapter->service_level.seq_print = zfcp_print_sl;
|
|
|
|
/* 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 (sysfs_create_group(&ccw_device->dev.kobj,
|
|
&zfcp_sysfs_adapter_attrs))
|
|
goto sysfs_failed;
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
|
|
|
|
if (!zfcp_adapter_scsi_register(adapter))
|
|
return 0;
|
|
|
|
sysfs_failed:
|
|
zfcp_erp_thread_kill(adapter);
|
|
erp_thread_failed:
|
|
zfcp_fc_gs_destroy(adapter);
|
|
generic_services_failed:
|
|
zfcp_destroy_adapter_work_queue(adapter);
|
|
work_queue_failed:
|
|
zfcp_dbf_adapter_unregister(adapter->dbf);
|
|
debug_register_failed:
|
|
dev_set_drvdata(&ccw_device->dev, NULL);
|
|
kfree(adapter->req_list);
|
|
low_mem_buffers_failed:
|
|
zfcp_free_low_mem_buffers(adapter);
|
|
qdio_failed:
|
|
zfcp_qdio_destroy(adapter->qdio);
|
|
kfree(adapter);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int retval = 0;
|
|
unsigned long flags;
|
|
|
|
cancel_work_sync(&adapter->stat_work);
|
|
zfcp_fc_wka_ports_force_offline(adapter->gs);
|
|
sysfs_remove_group(&adapter->ccw_device->dev.kobj,
|
|
&zfcp_sysfs_adapter_attrs);
|
|
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)
|
|
return;
|
|
|
|
zfcp_fc_gs_destroy(adapter);
|
|
zfcp_erp_thread_kill(adapter);
|
|
zfcp_destroy_adapter_work_queue(adapter);
|
|
zfcp_dbf_adapter_unregister(adapter->dbf);
|
|
zfcp_free_low_mem_buffers(adapter);
|
|
zfcp_qdio_destroy(adapter->qdio);
|
|
kfree(adapter->req_list);
|
|
kfree(adapter->fc_stats);
|
|
kfree(adapter->stats_reset_data);
|
|
kfree(adapter);
|
|
}
|
|
|
|
static void zfcp_sysfs_port_release(struct device *dev)
|
|
{
|
|
kfree(container_of(dev, struct zfcp_port, sysfs_device));
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* Returns: pointer to enqueued port on success, ERR_PTR on error
|
|
* Locks: config_mutex 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, u64 wwpn,
|
|
u32 status, u32 d_id)
|
|
{
|
|
struct zfcp_port *port;
|
|
|
|
port = zfcp_get_port_by_wwpn(adapter, wwpn);
|
|
if (port) {
|
|
zfcp_port_put(port);
|
|
return ERR_PTR(-EEXIST);
|
|
}
|
|
|
|
port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL);
|
|
if (!port)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rwlock_init(&port->unit_list_lock);
|
|
INIT_LIST_HEAD(&port->unit_list);
|
|
|
|
init_waitqueue_head(&port->remove_wq);
|
|
INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
|
|
INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
|
|
INIT_WORK(&port->rport_work, zfcp_scsi_rport_work);
|
|
|
|
port->adapter = adapter;
|
|
port->d_id = d_id;
|
|
port->wwpn = wwpn;
|
|
port->rport_task = RPORT_NONE;
|
|
|
|
/* 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);
|
|
|
|
if (dev_set_name(&port->sysfs_device, "0x%016llx",
|
|
(unsigned long long)wwpn)) {
|
|
kfree(port);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
port->sysfs_device.parent = &adapter->ccw_device->dev;
|
|
port->sysfs_device.release = zfcp_sysfs_port_release;
|
|
dev_set_drvdata(&port->sysfs_device, port);
|
|
|
|
if (device_register(&port->sysfs_device)) {
|
|
put_device(&port->sysfs_device);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (sysfs_create_group(&port->sysfs_device.kobj,
|
|
&zfcp_sysfs_port_attrs)) {
|
|
device_unregister(&port->sysfs_device);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
zfcp_port_get(port);
|
|
|
|
write_lock_irq(&adapter->port_list_lock);
|
|
list_add_tail(&port->list, &adapter->port_list);
|
|
write_unlock_irq(&adapter->port_list_lock);
|
|
|
|
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
|
|
atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
|
|
|
|
zfcp_adapter_get(adapter);
|
|
return 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)
|
|
{
|
|
struct zfcp_adapter *adapter = port->adapter;
|
|
|
|
list_del(&port->list); /* no list locking required here */
|
|
wait_event(port->remove_wq, atomic_read(&port->refcount) == 0);
|
|
zfcp_adapter_put(adapter);
|
|
sysfs_remove_group(&port->sysfs_device.kobj, &zfcp_sysfs_port_attrs);
|
|
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;
|
|
|
|
for (i = 0; i < count; i++, sg++)
|
|
if (sg)
|
|
free_page((unsigned long) sg_virt(sg));
|
|
else
|
|
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;
|
|
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;
|
|
}
|