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559 lines
14 KiB
559 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 Corp. 2002, 2020 |
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*/ |
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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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* Steffen Maier |
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* Benjamin Block |
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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/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include "zfcp_ext.h" |
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#include "zfcp_fc.h" |
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#include "zfcp_reqlist.h" |
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#include "zfcp_diag.h" |
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#define ZFCP_BUS_ID_SIZE 20 |
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MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - [email protected]"); |
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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 * __init 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 void __init zfcp_init_device_configure(char *busid, u64 wwpn, u64 lun) |
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{ |
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struct ccw_device *cdev; |
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struct zfcp_adapter *adapter; |
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struct zfcp_port *port; |
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cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); |
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if (!cdev) |
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return; |
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if (ccw_device_set_online(cdev)) |
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goto out_ccw_device; |
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adapter = zfcp_ccw_adapter_by_cdev(cdev); |
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if (!adapter) |
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goto out_ccw_device; |
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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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flush_work(&port->rport_work); |
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zfcp_unit_add(port, lun); |
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put_device(&port->dev); |
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out_port: |
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zfcp_ccw_adapter_put(adapter); |
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out_ccw_device: |
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put_device(&cdev->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 = kstrdup(devstr, GFP_KERNEL); |
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str = str_saved; |
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if (!str) |
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return; |
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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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strlcpy(busid, token, ZFCP_BUS_ID_SIZE); |
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token = strsep(&str, ","); |
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if (!token || kstrtoull(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 || kstrtoull(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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if (zfcp_experimental_dix) |
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pr_warn("DIX is enabled. It is experimental and might cause problems\n"); |
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zfcp_fsf_qtcb_cache = zfcp_cache_hw_align("zfcp_fsf_qtcb", |
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sizeof(struct fsf_qtcb)); |
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if (!zfcp_fsf_qtcb_cache) |
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goto out_qtcb_cache; |
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zfcp_fc_req_cache = zfcp_cache_hw_align("zfcp_fc_req", |
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sizeof(struct zfcp_fc_req)); |
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if (!zfcp_fc_req_cache) |
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goto out_fc_cache; |
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zfcp_scsi_transport_template = |
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fc_attach_transport(&zfcp_transport_functions); |
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if (!zfcp_scsi_transport_template) |
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goto out_transport; |
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scsi_transport_reserve_device(zfcp_scsi_transport_template, |
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sizeof(struct zfcp_scsi_dev)); |
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retval = ccw_driver_register(&zfcp_ccw_driver); |
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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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fc_release_transport(zfcp_scsi_transport_template); |
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out_transport: |
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kmem_cache_destroy(zfcp_fc_req_cache); |
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out_fc_cache: |
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kmem_cache_destroy(zfcp_fsf_qtcb_cache); |
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out_qtcb_cache: |
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return retval; |
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} |
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module_init(zfcp_module_init); |
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static void __exit zfcp_module_exit(void) |
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{ |
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ccw_driver_unregister(&zfcp_ccw_driver); |
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fc_release_transport(zfcp_scsi_transport_template); |
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kmem_cache_destroy(zfcp_fc_req_cache); |
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kmem_cache_destroy(zfcp_fsf_qtcb_cache); |
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} |
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module_exit(zfcp_module_exit); |
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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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if (!get_device(&port->dev)) |
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port = NULL; |
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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 int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter) |
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{ |
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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_fsf_qtcb_cache); |
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if (!adapter->pool.qtcb_pool) |
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return -ENOMEM; |
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BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE); |
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adapter->pool.sr_data = |
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mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0); |
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if (!adapter->pool.sr_data) |
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return -ENOMEM; |
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adapter->pool.gid_pn = |
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mempool_create_slab_pool(1, zfcp_fc_req_cache); |
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if (!adapter->pool.gid_pn) |
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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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mempool_destroy(adapter->pool.erp_req); |
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mempool_destroy(adapter->pool.scsi_req); |
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mempool_destroy(adapter->pool.scsi_abort); |
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mempool_destroy(adapter->pool.qtcb_pool); |
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mempool_destroy(adapter->pool.status_read_req); |
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mempool_destroy(adapter->pool.sr_data); |
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mempool_destroy(adapter->pool.gid_pn); |
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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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* Return: |
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* * 0 on success meaning at least one status read is pending |
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* * 1 if posting failed and not a single status read buffer is pending, |
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* also triggers adapter reopen recovery |
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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_add_unless(&adapter->stat_miss, -1, 0)) |
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if (zfcp_fsf_status_read(adapter->qdio)) { |
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atomic_inc(&adapter->stat_miss); /* undo add -1 */ |
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if (atomic_read(&adapter->stat_miss) >= |
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adapter->stat_read_buf_num) { |
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zfcp_erp_adapter_reopen(adapter, 0, "axsref1"); |
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return 1; |
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} |
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break; |
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} |
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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_version_change_lost_work(struct work_struct *work) |
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{ |
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struct zfcp_adapter *adapter = container_of(work, struct zfcp_adapter, |
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version_change_lost_work); |
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zfcp_fsf_exchange_config_data_sync(adapter->qdio, NULL); |
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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 = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); |
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if (adapter->work_queue) |
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return 0; |
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return -ENOMEM; |
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} |
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static void zfcp_destroy_adapter_work_queue(struct zfcp_adapter *adapter) |
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{ |
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if (adapter->work_queue) |
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destroy_workqueue(adapter->work_queue); |
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adapter->work_queue = NULL; |
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} |
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/** |
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* zfcp_adapter_enqueue - enqueue a new adapter to the list |
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* @ccw_device: pointer to the struct cc_device |
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* |
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* Returns: struct zfcp_adapter* |
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* Enqueues an adapter at the end of the adapter list in the driver data. |
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* All adapter internal structures are set up. |
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* Proc-fs entries are also created. |
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*/ |
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struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) |
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{ |
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struct zfcp_adapter *adapter; |
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if (!get_device(&ccw_device->dev)) |
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return ERR_PTR(-ENODEV); |
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adapter = kzalloc(sizeof(struct zfcp_adapter), GFP_KERNEL); |
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if (!adapter) { |
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put_device(&ccw_device->dev); |
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return ERR_PTR(-ENOMEM); |
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} |
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kref_init(&adapter->ref); |
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ccw_device->handler = NULL; |
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adapter->ccw_device = ccw_device; |
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INIT_WORK(&adapter->stat_work, _zfcp_status_read_scheduler); |
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INIT_DELAYED_WORK(&adapter->scan_work, zfcp_fc_scan_ports); |
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INIT_WORK(&adapter->ns_up_work, zfcp_fc_sym_name_update); |
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INIT_WORK(&adapter->version_change_lost_work, |
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zfcp_version_change_lost_work); |
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adapter->next_port_scan = jiffies; |
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adapter->erp_action.adapter = adapter; |
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if (zfcp_diag_adapter_setup(adapter)) |
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goto failed; |
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if (zfcp_qdio_setup(adapter)) |
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goto failed; |
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if (zfcp_allocate_low_mem_buffers(adapter)) |
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goto failed; |
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adapter->req_list = zfcp_reqlist_alloc(); |
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if (!adapter->req_list) |
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goto failed; |
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if (zfcp_dbf_adapter_register(adapter)) |
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goto failed; |
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if (zfcp_setup_adapter_work_queue(adapter)) |
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goto failed; |
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if (zfcp_fc_gs_setup(adapter)) |
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goto failed; |
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rwlock_init(&adapter->port_list_lock); |
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INIT_LIST_HEAD(&adapter->port_list); |
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INIT_LIST_HEAD(&adapter->events.list); |
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INIT_WORK(&adapter->events.work, zfcp_fc_post_event); |
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spin_lock_init(&adapter->events.list_lock); |
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init_waitqueue_head(&adapter->erp_ready_wq); |
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init_waitqueue_head(&adapter->erp_done_wqh); |
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INIT_LIST_HEAD(&adapter->erp_ready_head); |
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INIT_LIST_HEAD(&adapter->erp_running_head); |
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rwlock_init(&adapter->erp_lock); |
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rwlock_init(&adapter->abort_lock); |
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if (zfcp_erp_thread_setup(adapter)) |
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goto failed; |
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adapter->service_level.seq_print = zfcp_print_sl; |
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dev_set_drvdata(&ccw_device->dev, adapter); |
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if (sysfs_create_group(&ccw_device->dev.kobj, |
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&zfcp_sysfs_adapter_attrs)) |
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goto failed; |
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if (zfcp_diag_sysfs_setup(adapter)) |
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goto failed; |
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/* report size limit per scatter-gather segment */ |
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adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; |
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adapter->stat_read_buf_num = FSF_STATUS_READS_RECOM; |
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return adapter; |
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failed: |
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zfcp_adapter_unregister(adapter); |
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return ERR_PTR(-ENOMEM); |
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} |
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void zfcp_adapter_unregister(struct zfcp_adapter *adapter) |
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{ |
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struct ccw_device *cdev = adapter->ccw_device; |
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cancel_delayed_work_sync(&adapter->scan_work); |
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cancel_work_sync(&adapter->stat_work); |
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cancel_work_sync(&adapter->ns_up_work); |
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cancel_work_sync(&adapter->version_change_lost_work); |
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zfcp_destroy_adapter_work_queue(adapter); |
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zfcp_fc_wka_ports_force_offline(adapter->gs); |
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zfcp_scsi_adapter_unregister(adapter); |
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zfcp_diag_sysfs_destroy(adapter); |
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sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); |
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zfcp_erp_thread_kill(adapter); |
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zfcp_dbf_adapter_unregister(adapter); |
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zfcp_qdio_destroy(adapter->qdio); |
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zfcp_ccw_adapter_put(adapter); /* final put to release */ |
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} |
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/** |
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* zfcp_adapter_release - remove the adapter from the resource list |
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* @ref: pointer to struct kref |
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* locks: adapter list write lock is assumed to be held by caller |
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*/ |
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void zfcp_adapter_release(struct kref *ref) |
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{ |
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struct zfcp_adapter *adapter = container_of(ref, struct zfcp_adapter, |
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ref); |
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struct ccw_device *cdev = adapter->ccw_device; |
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dev_set_drvdata(&adapter->ccw_device->dev, NULL); |
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zfcp_fc_gs_destroy(adapter); |
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zfcp_free_low_mem_buffers(adapter); |
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zfcp_diag_adapter_free(adapter); |
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kfree(adapter->req_list); |
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kfree(adapter->fc_stats); |
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kfree(adapter->stats_reset_data); |
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kfree(adapter); |
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put_device(&cdev->dev); |
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} |
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static void zfcp_port_release(struct device *dev) |
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{ |
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struct zfcp_port *port = container_of(dev, struct zfcp_port, dev); |
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zfcp_ccw_adapter_put(port->adapter); |
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kfree(port); |
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} |
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/** |
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* zfcp_port_enqueue - enqueue port to port list of adapter |
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* @adapter: adapter where remote port is added |
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* @wwpn: WWPN of the remote port to be enqueued |
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* @status: initial status for the port |
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* @d_id: destination id of the remote port to be enqueued |
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* Returns: pointer to enqueued port on success, ERR_PTR on error |
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* |
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* All port internal structures are set up and the sysfs entry is generated. |
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* d_id is used to enqueue ports with a well known address like the Directory |
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* Service for nameserver lookup. |
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*/ |
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struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn, |
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u32 status, u32 d_id) |
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{ |
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struct zfcp_port *port; |
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int retval = -ENOMEM; |
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kref_get(&adapter->ref); |
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port = zfcp_get_port_by_wwpn(adapter, wwpn); |
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if (port) { |
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put_device(&port->dev); |
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retval = -EEXIST; |
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goto err_out; |
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} |
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port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); |
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if (!port) |
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goto err_out; |
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rwlock_init(&port->unit_list_lock); |
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INIT_LIST_HEAD(&port->unit_list); |
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atomic_set(&port->units, 0); |
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INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup); |
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INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work); |
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INIT_WORK(&port->rport_work, zfcp_scsi_rport_work); |
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port->adapter = adapter; |
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port->d_id = d_id; |
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port->wwpn = wwpn; |
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port->rport_task = RPORT_NONE; |
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port->dev.parent = &adapter->ccw_device->dev; |
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port->dev.groups = zfcp_port_attr_groups; |
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port->dev.release = zfcp_port_release; |
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port->erp_action.adapter = adapter; |
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port->erp_action.port = port; |
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if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) { |
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kfree(port); |
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goto err_out; |
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} |
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retval = -EINVAL; |
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if (device_register(&port->dev)) { |
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put_device(&port->dev); |
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goto err_out; |
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} |
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write_lock_irq(&adapter->port_list_lock); |
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list_add_tail(&port->list, &adapter->port_list); |
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write_unlock_irq(&adapter->port_list_lock); |
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atomic_or(status | ZFCP_STATUS_COMMON_RUNNING, &port->status); |
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return port; |
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|
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err_out: |
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zfcp_ccw_adapter_put(adapter); |
|
return ERR_PTR(retval); |
|
}
|
|
|