![Martin Peschke](/assets/img/avatar_default.png)
strict_strtoul and friends are obsolete. Use kstrtoul functions instead. Signed-off-by: Martin Peschke <mpeschke@linux.vnet.ibm.com> Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
580 lines
15 KiB
C
580 lines
15 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 Corp. 2002, 2013
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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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*/
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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 <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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#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 * __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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strncpy(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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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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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.sr_data)
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mempool_destroy(adapter->pool.sr_data);
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if (adapter->pool.gid_pn)
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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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* 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) >=
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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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} 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;
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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_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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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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/* report size limit per scatter-gather segment */
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adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
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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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if (!zfcp_scsi_adapter_register(adapter))
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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_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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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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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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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);
|
|
INIT_LIST_HEAD(&port->unit_list);
|
|
atomic_set(&port->units, 0);
|
|
|
|
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;
|
|
port->dev.parent = &adapter->ccw_device->dev;
|
|
port->dev.groups = zfcp_port_attr_groups;
|
|
port->dev.release = zfcp_port_release;
|
|
|
|
if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) {
|
|
kfree(port);
|
|
goto err_out;
|
|
}
|
|
retval = -EINVAL;
|
|
|
|
if (device_register(&port->dev)) {
|
|
put_device(&port->dev);
|
|
goto err_out;
|
|
}
|
|
|
|
write_lock_irq(&adapter->port_list_lock);
|
|
list_add_tail(&port->list, &adapter->port_list);
|
|
write_unlock_irq(&adapter->port_list_lock);
|
|
|
|
atomic_set_mask(status | ZFCP_STATUS_COMMON_RUNNING, &port->status);
|
|
|
|
return port;
|
|
|
|
err_out:
|
|
zfcp_ccw_adapter_put(adapter);
|
|
return ERR_PTR(retval);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|