11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * hosts.c Copyright (C) 1992 Drew Eckhardt 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 1993, 1994, 1995 Eric Youngdale 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2002-2003 Christoph Hellwig 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * mid to lowlevel SCSI driver interface 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Initial versions: Drew Eckhardt 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Subsequent revisions: Eric Youngdale 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * <drew@colorado.edu> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Added QLOGIC QLA1280 SCSI controller kernel host support. 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * August 4, 1999 Fred Lewis, Intel DuPont 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Updated to reflect the new initialization scheme for the higher 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * level of scsi drivers (sd/sr/st) 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * September 17, 2000 Torben Mathiasen <tmm@image.dk> 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Restructured scsi_host lists and associated functions. 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * September 04, 2002 Mike Anderson (andmike@us.ibm.com) 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/blkdev.h> 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 275a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 28c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig#include <linux/kthread.h> 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/string.h> 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mm.h> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/completion.h> 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/transport_class.h> 34d052d1beff706920e82c5d55006b08e256b5df09Russell King#include <linux/platform_device.h> 35bc4f24014de58f045f169742701a6598884d93dbAlan Stern#include <linux/pm_runtime.h> 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_device.h> 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_host.h> 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_transport.h> 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "scsi_priv.h" 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "scsi_logging.h" 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4530c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholtstatic atomic_t scsi_host_next_hn; /* host_no for next new host */ 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 48ee959b00c335d7780136c5abda37809191fe52c3Tony Jonesstatic void scsi_host_cls_release(struct device *dev) 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 50ee959b00c335d7780136c5abda37809191fe52c3Tony Jones put_device(&class_to_shost(dev)->shost_gendev); 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct class shost_class = { 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "scsi_host", 55ee959b00c335d7780136c5abda37809191fe52c3Tony Jones .dev_release = scsi_host_cls_release, 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 59eb44820c28bc9a042e1157b41c677018a8fdfc74Rob Landley * scsi_host_set_state - Take the given host through the host state model. 60d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * @shost: scsi host to change the state of. 61d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * @state: state to change to. 62d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * 63d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * Returns zero if unsuccessful or an error if the requested 64d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * transition is illegal. 65d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson **/ 66d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Andersonint scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state) 67d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson{ 68d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson enum scsi_host_state oldstate = shost->shost_state; 69d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 70d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson if (state == oldstate) 71d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson return 0; 72d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 73d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson switch (state) { 74d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_CREATED: 75d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson /* There are no legal states that come back to 76d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * created. This is the manually initialised start 77d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson * state */ 78d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson goto illegal; 79d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 80d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_RUNNING: 81d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson switch (oldstate) { 82d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_CREATED: 83d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_RECOVERY: 84d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 85d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson default: 86d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson goto illegal; 87d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson } 88d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 89d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 90d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_RECOVERY: 91d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson switch (oldstate) { 92d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_RUNNING: 93d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 94d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson default: 95d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson goto illegal; 96d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson } 97d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 98d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 99d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_CANCEL: 100d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson switch (oldstate) { 101d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_CREATED: 102d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_RUNNING: 103939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_CANCEL_RECOVERY: 104d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 105d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson default: 106d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson goto illegal; 107d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson } 108d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 109d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 110d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_DEL: 111d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson switch (oldstate) { 112d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson case SHOST_CANCEL: 113939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_DEL_RECOVERY: 114d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 115d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson default: 116d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson goto illegal; 117d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson } 118d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson break; 119d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 120939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_CANCEL_RECOVERY: 121939647ee308e0ad924e776657704c7bedd498664James Bottomley switch (oldstate) { 122939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_CANCEL: 123939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_RECOVERY: 124939647ee308e0ad924e776657704c7bedd498664James Bottomley break; 125939647ee308e0ad924e776657704c7bedd498664James Bottomley default: 126939647ee308e0ad924e776657704c7bedd498664James Bottomley goto illegal; 127939647ee308e0ad924e776657704c7bedd498664James Bottomley } 128939647ee308e0ad924e776657704c7bedd498664James Bottomley break; 129939647ee308e0ad924e776657704c7bedd498664James Bottomley 130939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_DEL_RECOVERY: 131939647ee308e0ad924e776657704c7bedd498664James Bottomley switch (oldstate) { 132939647ee308e0ad924e776657704c7bedd498664James Bottomley case SHOST_CANCEL_RECOVERY: 133939647ee308e0ad924e776657704c7bedd498664James Bottomley break; 134939647ee308e0ad924e776657704c7bedd498664James Bottomley default: 135939647ee308e0ad924e776657704c7bedd498664James Bottomley goto illegal; 136939647ee308e0ad924e776657704c7bedd498664James Bottomley } 137939647ee308e0ad924e776657704c7bedd498664James Bottomley break; 138d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson } 139d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson shost->shost_state = state; 140d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson return 0; 141d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 142d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson illegal: 143d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson SCSI_LOG_ERROR_RECOVERY(1, 1449ccfc756a70d454dfa82f48897e2883560c01a0eJames Bottomley shost_printk(KERN_ERR, shost, 1459ccfc756a70d454dfa82f48897e2883560c01a0eJames Bottomley "Illegal host state transition" 1469ccfc756a70d454dfa82f48897e2883560c01a0eJames Bottomley "%s->%s\n", 1479ccfc756a70d454dfa82f48897e2883560c01a0eJames Bottomley scsi_host_state_name(oldstate), 1489ccfc756a70d454dfa82f48897e2883560c01a0eJames Bottomley scsi_host_state_name(state))); 149d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson return -EINVAL; 150d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson} 151d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike AndersonEXPORT_SYMBOL(scsi_host_set_state); 152d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson 153d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson/** 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_remove_host - remove a scsi host 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: a pointer to a scsi host to remove 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid scsi_remove_host(struct Scsi_Host *shost) 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 159939647ee308e0ad924e776657704c7bedd498664James Bottomley unsigned long flags; 160bc4f24014de58f045f169742701a6598884d93dbAlan Stern 1610b9506723826c68b50fa33e345700ddcac1bed36Arjan van de Ven mutex_lock(&shost->scan_mutex); 162939647ee308e0ad924e776657704c7bedd498664James Bottomley spin_lock_irqsave(shost->host_lock, flags); 163939647ee308e0ad924e776657704c7bedd498664James Bottomley if (scsi_host_set_state(shost, SHOST_CANCEL)) 164939647ee308e0ad924e776657704c7bedd498664James Bottomley if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) { 165939647ee308e0ad924e776657704c7bedd498664James Bottomley spin_unlock_irqrestore(shost->host_lock, flags); 1660b9506723826c68b50fa33e345700ddcac1bed36Arjan van de Ven mutex_unlock(&shost->scan_mutex); 167939647ee308e0ad924e776657704c7bedd498664James Bottomley return; 168939647ee308e0ad924e776657704c7bedd498664James Bottomley } 169939647ee308e0ad924e776657704c7bedd498664James Bottomley spin_unlock_irqrestore(shost->host_lock, flags); 170bc4f24014de58f045f169742701a6598884d93dbAlan Stern 171bc4f24014de58f045f169742701a6598884d93dbAlan Stern scsi_autopm_get_host(shost); 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_forget_host(shost); 1734e46bf89972b9d98a9f282a9fed2359756a5e34eAlexey Kuznetsov mutex_unlock(&shost->scan_mutex); 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_proc_host_rm(shost); 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 176939647ee308e0ad924e776657704c7bedd498664James Bottomley spin_lock_irqsave(shost->host_lock, flags); 177939647ee308e0ad924e776657704c7bedd498664James Bottomley if (scsi_host_set_state(shost, SHOST_DEL)) 178939647ee308e0ad924e776657704c7bedd498664James Bottomley BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY)); 179939647ee308e0ad924e776657704c7bedd498664James Bottomley spin_unlock_irqrestore(shost->host_lock, flags); 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds transport_unregister_device(&shost->shost_gendev); 182ee959b00c335d7780136c5abda37809191fe52c3Tony Jones device_unregister(&shost->shost_dev); 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds device_del(&shost->shost_gendev); 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_remove_host); 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 188d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * scsi_add_host_with_dma - add a scsi host with dma device 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: scsi host pointer to add 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @dev: a struct device of type scsi class 191d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * @dma_dev: dma device for the host 192d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * 193d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * Note: You rarely need to worry about this unless you're in a 194d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * virtualised host environments, so use the simpler scsi_add_host() 195d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley * function instead. 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return value: 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 0 on success / != 0 for error 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 200d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomleyint scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, 201d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley struct device *dma_dev) 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct scsi_host_template *sht = shost->hostt; 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int error = -EINVAL; 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_INFO "scsi%d : %s\n", shost->host_no, 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sht->info ? sht->info(shost) : sht->name); 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!shost->can_queue) { 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: can_queue = 0 no longer supported\n", 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sht->name); 212542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley goto fail; 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 215542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley error = scsi_setup_command_freelist(shost); 216542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley if (error) 217542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley goto fail; 218542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!shost->shost_gendev.parent) 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->shost_gendev.parent = dev ? dev : &platform_bus; 2213c8d9a957d0ae62c2815393a781ab7ff4d5205e7James Bottomley if (!dma_dev) 2223c8d9a957d0ae62c2815393a781ab7ff4d5205e7James Bottomley dma_dev = shost->shost_gendev.parent; 2233c8d9a957d0ae62c2815393a781ab7ff4d5205e7James Bottomley 224d139b9bd0e52dda14fd13412e7096e68b56d0076James Bottomley shost->dma_dev = dma_dev; 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds error = device_add(&shost->shost_gendev); 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (error) 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out; 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 230bc4f24014de58f045f169742701a6598884d93dbAlan Stern pm_runtime_set_active(&shost->shost_gendev); 231bc4f24014de58f045f169742701a6598884d93dbAlan Stern pm_runtime_enable(&shost->shost_gendev); 232bc4f24014de58f045f169742701a6598884d93dbAlan Stern device_enable_async_suspend(&shost->shost_gendev); 233bc4f24014de58f045f169742701a6598884d93dbAlan Stern 234d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson scsi_host_set_state(shost, SHOST_RUNNING); 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_device(shost->shost_gendev.parent); 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2374cb077d93a57fb8bb64c277ec4ce637823cd76f4Rafael J. Wysocki device_enable_async_suspend(&shost->shost_dev); 2384cb077d93a57fb8bb64c277ec4ce637823cd76f4Rafael J. Wysocki 239ee959b00c335d7780136c5abda37809191fe52c3Tony Jones error = device_add(&shost->shost_dev); 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (error) 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_del_gendev; 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds get_device(&shost->shost_gendev); 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 24577cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart if (shost->transportt->host_size) { 24677cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart shost->shost_data = kzalloc(shost->transportt->host_size, 24777cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart GFP_KERNEL); 24877cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart if (shost->shost_data == NULL) { 24977cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart error = -ENOMEM; 250ee959b00c335d7780136c5abda37809191fe52c3Tony Jones goto out_del_dev; 25177cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart } 25277cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart } 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shost->transportt->create_work_queue) { 255aab0de245150c09e61c30962feb16aacde508dc3Kay Sievers snprintf(shost->work_q_name, sizeof(shost->work_q_name), 256aab0de245150c09e61c30962feb16aacde508dc3Kay Sievers "scsi_wq_%d", shost->host_no); 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->work_q = create_singlethread_workqueue( 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->work_q_name); 25977cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart if (!shost->work_q) { 26077cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart error = -EINVAL; 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_free_shost_data; 26277cca462c69d827fabee0ef3fdab86109c2fe8d8James Smart } 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds error = scsi_sysfs_add_host(shost); 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (error) 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto out_destroy_host; 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_proc_host_add(shost); 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return error; 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_destroy_host: 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shost->work_q) 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds destroy_workqueue(shost->work_q); 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_free_shost_data: 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(shost->shost_data); 277ee959b00c335d7780136c5abda37809191fe52c3Tony Jones out_del_dev: 278ee959b00c335d7780136c5abda37809191fe52c3Tony Jones device_del(&shost->shost_dev); 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out_del_gendev: 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds device_del(&shost->shost_gendev); 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds out: 282542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley scsi_destroy_command_freelist(shost); 283542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley fail: 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return error; 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 286d139b9bd0e52dda14fd13412e7096e68b56d0076James BottomleyEXPORT_SYMBOL(scsi_add_host_with_dma); 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void scsi_host_dev_release(struct device *dev) 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct Scsi_Host *shost = dev_to_shost(dev); 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct device *parent = dev->parent; 2923308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche struct request_queue *q; 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 29477c019768f0607c36e25bec11ce3e1eabef09277Alan Stern scsi_proc_hostdir_rm(shost->hostt); 29577c019768f0607c36e25bec11ce3e1eabef09277Alan Stern 296c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig if (shost->ehandler) 297c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig kthread_stop(shost->ehandler); 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shost->work_q) 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds destroy_workqueue(shost->work_q); 3003308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche q = shost->uspace_req_q; 3013308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche if (q) { 3023308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche kfree(q->queuedata); 3033308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche q->queuedata = NULL; 3043308511c93e6ad0d3c58984ecd6e5e57f96b12c8Bart Van Assche scsi_free_queue(q); 305b58d91547fb17c65ad621f3f98b1f2c228c812a5FUJITA Tomonori } 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_destroy_command_freelist(shost); 30886e33a296c2c9ed6eece0bfff4ac776f42040504James Bottomley if (shost->bqt) 30986e33a296c2c9ed6eece0bfff4ac776f42040504James Bottomley blk_free_tags(shost->bqt); 31086e33a296c2c9ed6eece0bfff4ac776f42040504James Bottomley 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(shost->shost_data); 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (parent) 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds put_device(parent); 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(shost); 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 318453cd0f3ff3bf25d86c96e62d271ba238f06d5ffAdrian Bunkstatic struct device_type scsi_host_type = { 319b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke .name = "scsi_host", 320b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke .release = scsi_host_dev_release, 321b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke}; 322b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_host_alloc - register a scsi host adapter instance. 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @sht: pointer to scsi host template 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @privsize: extra bytes to allocate for driver 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Note: 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Allocate a new Scsi_Host and perform basic initialization. 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The host is not published to the scsi midlayer until scsi_add_host 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * is called. 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return value: 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Pointer to a new Scsi_Host 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct Scsi_Host *shost; 339c53033f6b0bd7cc133b7f433083f0394cf29ac70Al Viro gfp_t gfp_mask = GFP_KERNEL; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sht->unchecked_isa_dma && privsize) 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds gfp_mask |= __GFP_DMA; 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 34424669f75a3231fa37444977c92d1f4838bec1233Jes Sorensen shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask); 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!shost) 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3484f777ed26086452737ea52597cf8de26137090d5Christoph Hellwig shost->host_lock = &shost->default_lock; 3494f777ed26086452737ea52597cf8de26137090d5Christoph Hellwig spin_lock_init(shost->host_lock); 350d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson shost->shost_state = SHOST_CREATED; 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds INIT_LIST_HEAD(&shost->__devices); 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds INIT_LIST_HEAD(&shost->__targets); 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds INIT_LIST_HEAD(&shost->eh_cmd_q); 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds INIT_LIST_HEAD(&shost->starved_list); 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds init_waitqueue_head(&shost->host_wait); 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3570b9506723826c68b50fa33e345700ddcac1bed36Arjan van de Ven mutex_init(&shost->scan_mutex); 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 35930c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholt /* 36030c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholt * subtract one because we increment first then return, but we need to 36130c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholt * know what the next host number was before increment 36230c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholt */ 36330c9afa6cc477f6f21f8a0b36f3b81080941a0c9Joe Eykholt shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1; 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->dma_channel = 0xff; 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* These three are default values which can be overridden */ 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_channel = 0; 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_id = 8; 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_lun = 8; 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Give each shost a default transportt */ 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->transportt = &blank_transport_template; 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * All drivers right now should be able to handle 12 byte 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * commands. Every so often there are requests for 16 byte 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * commands, but individual low-level drivers need to certify that 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * they actually do something sensible with such commands. 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_cmd_len = 12; 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->hostt = sht; 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->this_id = sht->this_id; 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->can_queue = sht->can_queue; 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->sg_tablesize = sht->sg_tablesize; 38513f05c8d8e98bbdce89158bfdb2e380940695a88Martin K. Petersen shost->sg_prot_tablesize = sht->sg_prot_tablesize; 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->cmd_per_lun = sht->cmd_per_lun; 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->unchecked_isa_dma = sht->unchecked_isa_dma; 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->use_clustering = sht->use_clustering; 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->ordered_tag = sht->ordered_tag; 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3917a39ac3f25bef018862a991d754aff681c019127James Bottomley if (sht->supported_mode == MODE_UNKNOWN) 3927a39ac3f25bef018862a991d754aff681c019127James Bottomley /* means we didn't set it ... default to INITIATOR */ 3937a39ac3f25bef018862a991d754aff681c019127James Bottomley shost->active_mode = MODE_INITIATOR; 3947a39ac3f25bef018862a991d754aff681c019127James Bottomley else 3957a39ac3f25bef018862a991d754aff681c019127James Bottomley shost->active_mode = sht->supported_mode; 3967a39ac3f25bef018862a991d754aff681c019127James Bottomley 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sht->max_host_blocked) 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_host_blocked = sht->max_host_blocked; 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED; 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If the driver imposes no hard sector transfer limit, start at 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * machine infinity initially. 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sht->max_sectors) 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_sectors = sht->max_sectors; 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS; 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * assume a 4GB boundary, if not set 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sht->dma_boundary) 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->dma_boundary = sht->dma_boundary; 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds shost->dma_boundary = 0xffffffff; 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds device_initialize(&shost->shost_gendev); 42071610f55fa4db63dbf5385929a47c9fb2451f332Kay Sievers dev_set_name(&shost->shost_gendev, "host%d", shost->host_no); 421b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke shost->shost_gendev.bus = &scsi_bus_type; 422b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke shost->shost_gendev.type = &scsi_host_type; 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 424ee959b00c335d7780136c5abda37809191fe52c3Tony Jones device_initialize(&shost->shost_dev); 425ee959b00c335d7780136c5abda37809191fe52c3Tony Jones shost->shost_dev.parent = &shost->shost_gendev; 426ee959b00c335d7780136c5abda37809191fe52c3Tony Jones shost->shost_dev.class = &shost_class; 42771610f55fa4db63dbf5385929a47c9fb2451f332Kay Sievers dev_set_name(&shost->shost_dev, "host%d", shost->host_no); 428f7120a4f75168df3c02efacd10403a4ba0bcb29dHannes Reinecke shost->shost_dev.groups = scsi_sysfs_shost_attr_groups; 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 430c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig shost->ehandler = kthread_run(scsi_error_handler, shost, 431c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig "scsi_eh_%d", shost->host_no); 432c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig if (IS_ERR(shost->ehandler)) { 433e4bf25fbcc64a87d7dc1d3318ca56c28382757e2Justin P. Mattock printk(KERN_WARNING "scsi%d: error handler thread failed to spawn, error = %ld\n", 434e4bf25fbcc64a87d7dc1d3318ca56c28382757e2Justin P. Mattock shost->host_no, PTR_ERR(shost->ehandler)); 435542bd1377a963070bc4a03ff7d2690ddf3920596James Bottomley goto fail_kfree; 436c5478def7a3a2dba9ceda452c2aa3539514d30a9Christoph Hellwig } 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_proc_hostdir_add(shost->hostt); 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return shost; 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds fail_kfree: 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(shost); 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_host_alloc); 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize) 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct Scsi_Host *shost = scsi_host_alloc(sht, privsize); 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!sht->detect) { 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_WARNING "scsi_register() called on new-style " 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "template for driver %s\n", sht->name); 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dump_stack(); 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (shost) 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts); 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return shost; 4601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_register); 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid scsi_unregister(struct Scsi_Host *shost) 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds list_del(&shost->sht_legacy_list); 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_host_put(shost); 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_unregister); 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 470ee959b00c335d7780136c5abda37809191fe52c3Tony Jonesstatic int __scsi_host_match(struct device *dev, void *data) 4719c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young{ 4729c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young struct Scsi_Host *p; 4739c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young unsigned short *hostnum = (unsigned short *)data; 4749c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young 475ee959b00c335d7780136c5abda37809191fe52c3Tony Jones p = class_to_shost(dev); 4769c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young return p->host_no == *hostnum; 4779c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young} 4789c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_host_lookup - get a reference to a Scsi_Host by host no 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @hostnum: host number to locate 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 4831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return value: 4841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * A pointer to located Scsi_Host or NULL. 4853ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie * 4863ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie * The caller must do a scsi_host_put() to drop the reference 4873ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie * that scsi_host_get() took. The put_device() below dropped 4883ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie * the reference from class_find_device(). 4891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 4901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct Scsi_Host *scsi_host_lookup(unsigned short hostnum) 4911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 492ee959b00c335d7780136c5abda37809191fe52c3Tony Jones struct device *cdev; 493315cb0ad124575e75da2d0e0a95990587fc23485James Smart struct Scsi_Host *shost = NULL; 4941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 495695794ae0c5bdd9bd06e35b118801e2e9be04f9eGreg Kroah-Hartman cdev = class_find_device(&shost_class, NULL, &hostnum, 496695794ae0c5bdd9bd06e35b118801e2e9be04f9eGreg Kroah-Hartman __scsi_host_match); 4973ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie if (cdev) { 4989c7701088a61cc0cf8a6e1c68d1e74e3cc2ee0b7Dave Young shost = scsi_host_get(class_to_shost(cdev)); 4993ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie put_device(cdev); 5003ed7897242b7efe977f3a8d06d4e5a4ebe28b10eMike Christie } 5011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return shost; 5021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_host_lookup); 5041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_host_get - inc a Scsi_Host ref count 5071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: Pointer to Scsi_Host to inc. 5081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 5091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct Scsi_Host *scsi_host_get(struct Scsi_Host *shost) 5101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 511d3301874083874f8a0ac88aa1bb7da6b62df34d2Mike Anderson if ((shost->shost_state == SHOST_DEL) || 5121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds !get_device(&shost->shost_gendev)) 5131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 5141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return shost; 5151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_host_get); 5171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_host_put - dec a Scsi_Host ref count 5201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: Pointer to Scsi_Host to dec. 5211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 5221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid scsi_host_put(struct Scsi_Host *shost) 5231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds put_device(&shost->shost_gendev); 5251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_host_put); 5271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint scsi_init_hosts(void) 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return class_register(&shost_class); 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid scsi_exit_hosts(void) 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds class_unregister(&shost_class); 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint scsi_is_host_device(const struct device *dev) 5391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 540b0ed43360fdca227048d88a08290365cb681c1a8Hannes Reinecke return dev->type == &scsi_host_type; 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL(scsi_is_host_device); 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_queue_work - Queue work to the Scsi_Host workqueue. 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: Pointer to Scsi_Host. 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @work: Work to queue for execution. 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Return value: 550dd7e2f2266acf66ec882baa6fbd79f853b5fe966Michael Reed * 1 - work queued for execution 551dd7e2f2266acf66ec882baa6fbd79f853b5fe966Michael Reed * 0 - work is already queued 552dd7e2f2266acf66ec882baa6fbd79f853b5fe966Michael Reed * -EINVAL - work queue doesn't exist 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work) 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (unlikely(!shost->work_q)) { 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "ERROR: Scsi host '%s' attempted to queue scsi-work, " 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "when no workqueue created.\n", shost->hostt->name); 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dump_stack(); 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return queue_work(shost->work_q, work); 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL_GPL(scsi_queue_work); 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/** 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * scsi_flush_work - Flush a Scsi_Host's workqueue. 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @shost: Pointer to Scsi_Host. 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds **/ 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid scsi_flush_work(struct Scsi_Host *shost) 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!shost->work_q) { 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR 5771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "ERROR: Scsi host '%s' attempted to flush scsi-work, " 5781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "when no workqueue created.\n", shost->hostt->name); 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dump_stack(); 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds flush_workqueue(shost->work_q); 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsEXPORT_SYMBOL_GPL(scsi_flush_work); 586