11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * scsi_scan.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2000 Eric Youngdale, 51da177e4SLinus Torvalds * Copyright (C) 2002 Patrick Mansfield 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * The general scanning/probing algorithm is as follows, exceptions are 81da177e4SLinus Torvalds * made to it depending on device specific flags, compilation options, and 91da177e4SLinus Torvalds * global variable (boot or module load time) settings. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * A specific LUN is scanned via an INQUIRY command; if the LUN has a 12f64a181dSChristoph Hellwig * device attached, a scsi_device is allocated and setup for it. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * For every id of every channel on the given host: 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * Scan LUN 0; if the target responds to LUN 0 (even if there is no 171da177e4SLinus Torvalds * device or storage attached to LUN 0): 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * If LUN 0 has a device attached, allocate and setup a 20f64a181dSChristoph Hellwig * scsi_device for it. 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * If target is SCSI-3 or up, issue a REPORT LUN, and scan 231da177e4SLinus Torvalds * all of the LUNs returned by the REPORT LUN; else, 241da177e4SLinus Torvalds * sequentially scan LUNs up until some maximum is reached, 251da177e4SLinus Torvalds * or a LUN is seen that cannot have a device attached to it. 261da177e4SLinus Torvalds */ 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds #include <linux/module.h> 291da177e4SLinus Torvalds #include <linux/moduleparam.h> 301da177e4SLinus Torvalds #include <linux/init.h> 311da177e4SLinus Torvalds #include <linux/blkdev.h> 323e082a91SMatthew Wilcox #include <linux/delay.h> 333e082a91SMatthew Wilcox #include <linux/kthread.h> 343e082a91SMatthew Wilcox #include <linux/spinlock.h> 354ace92fcSArjan van de Ven #include <linux/async.h> 365a0e3ad6STejun Heo #include <linux/slab.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #include <scsi/scsi.h> 39beb40487SChristoph Hellwig #include <scsi/scsi_cmnd.h> 401da177e4SLinus Torvalds #include <scsi/scsi_device.h> 411da177e4SLinus Torvalds #include <scsi/scsi_driver.h> 421da177e4SLinus Torvalds #include <scsi/scsi_devinfo.h> 431da177e4SLinus Torvalds #include <scsi/scsi_host.h> 441da177e4SLinus Torvalds #include <scsi/scsi_transport.h> 451da177e4SLinus Torvalds #include <scsi/scsi_eh.h> 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds #include "scsi_priv.h" 481da177e4SLinus Torvalds #include "scsi_logging.h" 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ 511da177e4SLinus Torvalds " SCSI scanning, some SCSI devices might not be configured\n" 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* 541da177e4SLinus Torvalds * Default timeout 551da177e4SLinus Torvalds */ 561da177e4SLinus Torvalds #define SCSI_TIMEOUT (2*HZ) 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* 59405ae7d3SRobert P. J. Day * Prefix values for the SCSI id's (stored in sysfs name field) 601da177e4SLinus Torvalds */ 611da177e4SLinus Torvalds #define SCSI_UID_SER_NUM 'S' 621da177e4SLinus Torvalds #define SCSI_UID_UNKNOWN 'Z' 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* 651da177e4SLinus Torvalds * Return values of some of the scanning functions. 661da177e4SLinus Torvalds * 671da177e4SLinus Torvalds * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this 681da177e4SLinus Torvalds * includes allocation or general failures preventing IO from being sent. 691da177e4SLinus Torvalds * 701da177e4SLinus Torvalds * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available 711da177e4SLinus Torvalds * on the given LUN. 721da177e4SLinus Torvalds * 731da177e4SLinus Torvalds * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a 741da177e4SLinus Torvalds * given LUN. 751da177e4SLinus Torvalds */ 761da177e4SLinus Torvalds #define SCSI_SCAN_NO_RESPONSE 0 771da177e4SLinus Torvalds #define SCSI_SCAN_TARGET_PRESENT 1 781da177e4SLinus Torvalds #define SCSI_SCAN_LUN_PRESENT 2 791da177e4SLinus Torvalds 800ad78200SArjan van de Ven static const char *scsi_null_device_strs = "nullnullnullnull"; 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds #define MAX_SCSI_LUNS 512 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds #ifdef CONFIG_SCSI_MULTI_LUN 851da177e4SLinus Torvalds static unsigned int max_scsi_luns = MAX_SCSI_LUNS; 861da177e4SLinus Torvalds #else 871da177e4SLinus Torvalds static unsigned int max_scsi_luns = 1; 881da177e4SLinus Torvalds #endif 891da177e4SLinus Torvalds 9010f4b89aSMasatake YAMATO module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); 911da177e4SLinus Torvalds MODULE_PARM_DESC(max_luns, 921da177e4SLinus Torvalds "last scsi LUN (should be between 1 and 2^32-1)"); 931da177e4SLinus Torvalds 9421db1882SMatthew Wilcox #ifdef CONFIG_SCSI_SCAN_ASYNC 9521db1882SMatthew Wilcox #define SCSI_SCAN_TYPE_DEFAULT "async" 9621db1882SMatthew Wilcox #else 9721db1882SMatthew Wilcox #define SCSI_SCAN_TYPE_DEFAULT "sync" 9821db1882SMatthew Wilcox #endif 9921db1882SMatthew Wilcox 10021db1882SMatthew Wilcox static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; 1013e082a91SMatthew Wilcox 1023e082a91SMatthew Wilcox module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); 1033e082a91SMatthew Wilcox MODULE_PARM_DESC(scan, "sync, async or none"); 1043e082a91SMatthew Wilcox 1051da177e4SLinus Torvalds /* 1061da177e4SLinus Torvalds * max_scsi_report_luns: the maximum number of LUNS that will be 1071da177e4SLinus Torvalds * returned from the REPORT LUNS command. 8 times this value must 1081da177e4SLinus Torvalds * be allocated. In theory this could be up to an 8 byte value, but 1091da177e4SLinus Torvalds * in practice, the maximum number of LUNs suppored by any device 1101da177e4SLinus Torvalds * is about 16k. 1111da177e4SLinus Torvalds */ 1121da177e4SLinus Torvalds static unsigned int max_scsi_report_luns = 511; 1131da177e4SLinus Torvalds 11410f4b89aSMasatake YAMATO module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); 1151da177e4SLinus Torvalds MODULE_PARM_DESC(max_report_luns, 1161da177e4SLinus Torvalds "REPORT LUNS maximum number of LUNS received (should be" 1171da177e4SLinus Torvalds " between 1 and 16384)"); 1181da177e4SLinus Torvalds 11914faf12fSAlan Stern static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18; 1201da177e4SLinus Torvalds 12110f4b89aSMasatake YAMATO module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); 1221da177e4SLinus Torvalds MODULE_PARM_DESC(inq_timeout, 1231da177e4SLinus Torvalds "Timeout (in seconds) waiting for devices to answer INQUIRY." 12414faf12fSAlan Stern " Default is 20. Some devices may need more; most need less."); 1251da177e4SLinus Torvalds 1266b7f123fSMatthew Wilcox /* This lock protects only this list */ 1273e082a91SMatthew Wilcox static DEFINE_SPINLOCK(async_scan_lock); 1283e082a91SMatthew Wilcox static LIST_HEAD(scanning_hosts); 1293e082a91SMatthew Wilcox 1303e082a91SMatthew Wilcox struct async_scan_data { 1313e082a91SMatthew Wilcox struct list_head list; 1323e082a91SMatthew Wilcox struct Scsi_Host *shost; 1333e082a91SMatthew Wilcox struct completion prev_finished; 1343e082a91SMatthew Wilcox }; 1353e082a91SMatthew Wilcox 1363e082a91SMatthew Wilcox /** 1373e082a91SMatthew Wilcox * scsi_complete_async_scans - Wait for asynchronous scans to complete 1383e082a91SMatthew Wilcox * 1398bcc2412SMatthew Wilcox * When this function returns, any host which started scanning before 1408bcc2412SMatthew Wilcox * this function was called will have finished its scan. Hosts which 1418bcc2412SMatthew Wilcox * started scanning after this function was called may or may not have 1428bcc2412SMatthew Wilcox * finished. 1433e082a91SMatthew Wilcox */ 1443e082a91SMatthew Wilcox int scsi_complete_async_scans(void) 1453e082a91SMatthew Wilcox { 1463e082a91SMatthew Wilcox struct async_scan_data *data; 1473e082a91SMatthew Wilcox 1483e082a91SMatthew Wilcox do { 1493e082a91SMatthew Wilcox if (list_empty(&scanning_hosts)) 150*e96eb23dSDan Williams return 0; 1513e082a91SMatthew Wilcox /* If we can't get memory immediately, that's OK. Just 1523e082a91SMatthew Wilcox * sleep a little. Even if we never get memory, the async 1533e082a91SMatthew Wilcox * scans will finish eventually. 1543e082a91SMatthew Wilcox */ 1553e082a91SMatthew Wilcox data = kmalloc(sizeof(*data), GFP_KERNEL); 1563e082a91SMatthew Wilcox if (!data) 1573e082a91SMatthew Wilcox msleep(1); 1583e082a91SMatthew Wilcox } while (!data); 1593e082a91SMatthew Wilcox 1603e082a91SMatthew Wilcox data->shost = NULL; 1613e082a91SMatthew Wilcox init_completion(&data->prev_finished); 1623e082a91SMatthew Wilcox 1633e082a91SMatthew Wilcox spin_lock(&async_scan_lock); 1643e082a91SMatthew Wilcox /* Check that there's still somebody else on the list */ 1653e082a91SMatthew Wilcox if (list_empty(&scanning_hosts)) 1663e082a91SMatthew Wilcox goto done; 1673e082a91SMatthew Wilcox list_add_tail(&data->list, &scanning_hosts); 1683e082a91SMatthew Wilcox spin_unlock(&async_scan_lock); 1693e082a91SMatthew Wilcox 1703e082a91SMatthew Wilcox printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); 1713e082a91SMatthew Wilcox wait_for_completion(&data->prev_finished); 1723e082a91SMatthew Wilcox 1733e082a91SMatthew Wilcox spin_lock(&async_scan_lock); 1743e082a91SMatthew Wilcox list_del(&data->list); 1758bcc2412SMatthew Wilcox if (!list_empty(&scanning_hosts)) { 1768bcc2412SMatthew Wilcox struct async_scan_data *next = list_entry(scanning_hosts.next, 1778bcc2412SMatthew Wilcox struct async_scan_data, list); 1788bcc2412SMatthew Wilcox complete(&next->prev_finished); 1798bcc2412SMatthew Wilcox } 1803e082a91SMatthew Wilcox done: 1813e082a91SMatthew Wilcox spin_unlock(&async_scan_lock); 182*e96eb23dSDan Williams 1833e082a91SMatthew Wilcox kfree(data); 1843e082a91SMatthew Wilcox return 0; 1853e082a91SMatthew Wilcox } 1863e082a91SMatthew Wilcox 1871da177e4SLinus Torvalds /** 1881da177e4SLinus Torvalds * scsi_unlock_floptical - unlock device via a special MODE SENSE command 18939216033SJames Bottomley * @sdev: scsi device to send command to 1901da177e4SLinus Torvalds * @result: area to store the result of the MODE SENSE 1911da177e4SLinus Torvalds * 1921da177e4SLinus Torvalds * Description: 19339216033SJames Bottomley * Send a vendor specific MODE SENSE (not a MODE SELECT) command. 1941da177e4SLinus Torvalds * Called for BLIST_KEY devices. 1951da177e4SLinus Torvalds **/ 19639216033SJames Bottomley static void scsi_unlock_floptical(struct scsi_device *sdev, 1971da177e4SLinus Torvalds unsigned char *result) 1981da177e4SLinus Torvalds { 1991da177e4SLinus Torvalds unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); 2021da177e4SLinus Torvalds scsi_cmd[0] = MODE_SENSE; 2031da177e4SLinus Torvalds scsi_cmd[1] = 0; 2041da177e4SLinus Torvalds scsi_cmd[2] = 0x2e; 2051da177e4SLinus Torvalds scsi_cmd[3] = 0; 2061da177e4SLinus Torvalds scsi_cmd[4] = 0x2a; /* size */ 2071da177e4SLinus Torvalds scsi_cmd[5] = 0; 20839216033SJames Bottomley scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, 209f4f4e47eSFUJITA Tomonori SCSI_TIMEOUT, 3, NULL); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /** 2131da177e4SLinus Torvalds * scsi_alloc_sdev - allocate and setup a scsi_Device 214eb44820cSRob Landley * @starget: which target to allocate a &scsi_device for 215eb44820cSRob Landley * @lun: which lun 216eb44820cSRob Landley * @hostdata: usually NULL and set by ->slave_alloc instead 2171da177e4SLinus Torvalds * 2181da177e4SLinus Torvalds * Description: 2191da177e4SLinus Torvalds * Allocate, initialize for io, and return a pointer to a scsi_Device. 2201da177e4SLinus Torvalds * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and 2211da177e4SLinus Torvalds * adds scsi_Device to the appropriate list. 2221da177e4SLinus Torvalds * 2231da177e4SLinus Torvalds * Return value: 2241da177e4SLinus Torvalds * scsi_Device pointer, or NULL on failure. 2251da177e4SLinus Torvalds **/ 2261da177e4SLinus Torvalds static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, 2271da177e4SLinus Torvalds unsigned int lun, void *hostdata) 2281da177e4SLinus Torvalds { 2291da177e4SLinus Torvalds struct scsi_device *sdev; 2301da177e4SLinus Torvalds int display_failure_msg = 1, ret; 2311da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 232a341cd0fSJeff Garzik extern void scsi_evt_thread(struct work_struct *work); 2339937a5e2SJens Axboe extern void scsi_requeue_run_queue(struct work_struct *work); 2341da177e4SLinus Torvalds 23524669f75SJes Sorensen sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, 2361da177e4SLinus Torvalds GFP_ATOMIC); 2371da177e4SLinus Torvalds if (!sdev) 2381da177e4SLinus Torvalds goto out; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds sdev->vendor = scsi_null_device_strs; 2411da177e4SLinus Torvalds sdev->model = scsi_null_device_strs; 2421da177e4SLinus Torvalds sdev->rev = scsi_null_device_strs; 2431da177e4SLinus Torvalds sdev->host = shost; 2444a84067dSVasu Dev sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; 2451da177e4SLinus Torvalds sdev->id = starget->id; 2461da177e4SLinus Torvalds sdev->lun = lun; 2471da177e4SLinus Torvalds sdev->channel = starget->channel; 2481da177e4SLinus Torvalds sdev->sdev_state = SDEV_CREATED; 2491da177e4SLinus Torvalds INIT_LIST_HEAD(&sdev->siblings); 2501da177e4SLinus Torvalds INIT_LIST_HEAD(&sdev->same_target_siblings); 2511da177e4SLinus Torvalds INIT_LIST_HEAD(&sdev->cmd_list); 2521da177e4SLinus Torvalds INIT_LIST_HEAD(&sdev->starved_entry); 253a341cd0fSJeff Garzik INIT_LIST_HEAD(&sdev->event_list); 2541da177e4SLinus Torvalds spin_lock_init(&sdev->list_lock); 255a341cd0fSJeff Garzik INIT_WORK(&sdev->event_work, scsi_evt_thread); 2569937a5e2SJens Axboe INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue); 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds sdev->sdev_gendev.parent = get_device(&starget->dev); 2591da177e4SLinus Torvalds sdev->sdev_target = starget; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds /* usually NULL and set by ->slave_alloc instead */ 2621da177e4SLinus Torvalds sdev->hostdata = hostdata; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds /* if the device needs this changing, it may do so in the 2651da177e4SLinus Torvalds * slave_configure function */ 2661da177e4SLinus Torvalds sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds /* 2691da177e4SLinus Torvalds * Some low level driver could use device->type 2701da177e4SLinus Torvalds */ 2711da177e4SLinus Torvalds sdev->type = -1; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* 2741da177e4SLinus Torvalds * Assume that the device will have handshaking problems, 2751da177e4SLinus Torvalds * and then fix this field later if it turns out it 2761da177e4SLinus Torvalds * doesn't 2771da177e4SLinus Torvalds */ 2781da177e4SLinus Torvalds sdev->borken = 1; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds sdev->request_queue = scsi_alloc_queue(sdev); 2811da177e4SLinus Torvalds if (!sdev->request_queue) { 2821da177e4SLinus Torvalds /* release fn is set up in scsi_sysfs_device_initialise, so 2831da177e4SLinus Torvalds * have to free and put manually here */ 2841da177e4SLinus Torvalds put_device(&starget->dev); 28593f56089SDave Jones kfree(sdev); 2861da177e4SLinus Torvalds goto out; 2871da177e4SLinus Torvalds } 28809ac46c4STejun Heo WARN_ON_ONCE(!blk_get_queue(sdev->request_queue)); 2891da177e4SLinus Torvalds sdev->request_queue->queuedata = sdev; 2901da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds scsi_sysfs_device_initialize(sdev); 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds if (shost->hostt->slave_alloc) { 2951da177e4SLinus Torvalds ret = shost->hostt->slave_alloc(sdev); 2961da177e4SLinus Torvalds if (ret) { 2971da177e4SLinus Torvalds /* 2981da177e4SLinus Torvalds * if LLDD reports slave not present, don't clutter 2991da177e4SLinus Torvalds * console with alloc failure messages 3001da177e4SLinus Torvalds */ 3011da177e4SLinus Torvalds if (ret == -ENXIO) 3021da177e4SLinus Torvalds display_failure_msg = 0; 3031da177e4SLinus Torvalds goto out_device_destroy; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds return sdev; 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds out_device_destroy: 3104e6c82b3SJames Bottomley __scsi_remove_device(sdev); 3111da177e4SLinus Torvalds out: 3121da177e4SLinus Torvalds if (display_failure_msg) 313cadbd4a5SHarvey Harrison printk(ALLOC_FAILURE_MSG, __func__); 3141da177e4SLinus Torvalds return NULL; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 317643eb2d9SJames Bottomley static void scsi_target_destroy(struct scsi_target *starget) 318643eb2d9SJames Bottomley { 319643eb2d9SJames Bottomley struct device *dev = &starget->dev; 320643eb2d9SJames Bottomley struct Scsi_Host *shost = dev_to_shost(dev->parent); 321643eb2d9SJames Bottomley unsigned long flags; 322643eb2d9SJames Bottomley 323643eb2d9SJames Bottomley transport_destroy_device(dev); 324643eb2d9SJames Bottomley spin_lock_irqsave(shost->host_lock, flags); 325643eb2d9SJames Bottomley if (shost->hostt->target_destroy) 326643eb2d9SJames Bottomley shost->hostt->target_destroy(starget); 327643eb2d9SJames Bottomley list_del_init(&starget->siblings); 328643eb2d9SJames Bottomley spin_unlock_irqrestore(shost->host_lock, flags); 329643eb2d9SJames Bottomley put_device(dev); 330643eb2d9SJames Bottomley } 331643eb2d9SJames Bottomley 3321da177e4SLinus Torvalds static void scsi_target_dev_release(struct device *dev) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds struct device *parent = dev->parent; 3351da177e4SLinus Torvalds struct scsi_target *starget = to_scsi_target(dev); 336a283bd37SJames Bottomley 3371da177e4SLinus Torvalds kfree(starget); 3381da177e4SLinus Torvalds put_device(parent); 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 341453cd0f3SAdrian Bunk static struct device_type scsi_target_type = { 342b0ed4336SHannes Reinecke .name = "scsi_target", 343b0ed4336SHannes Reinecke .release = scsi_target_dev_release, 344b0ed4336SHannes Reinecke }; 345b0ed4336SHannes Reinecke 3461da177e4SLinus Torvalds int scsi_is_target_device(const struct device *dev) 3471da177e4SLinus Torvalds { 348b0ed4336SHannes Reinecke return dev->type == &scsi_target_type; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_is_target_device); 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds static struct scsi_target *__scsi_find_target(struct device *parent, 3531da177e4SLinus Torvalds int channel, uint id) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds struct scsi_target *starget, *found_starget = NULL; 3561da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(parent); 3571da177e4SLinus Torvalds /* 3581da177e4SLinus Torvalds * Search for an existing target for this sdev. 3591da177e4SLinus Torvalds */ 3601da177e4SLinus Torvalds list_for_each_entry(starget, &shost->__targets, siblings) { 3611da177e4SLinus Torvalds if (starget->id == id && 3621da177e4SLinus Torvalds starget->channel == channel) { 3631da177e4SLinus Torvalds found_starget = starget; 3641da177e4SLinus Torvalds break; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds if (found_starget) 3681da177e4SLinus Torvalds get_device(&found_starget->dev); 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds return found_starget; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 373884d25ccSJames Bottomley /** 374884d25ccSJames Bottomley * scsi_alloc_target - allocate a new or find an existing target 375884d25ccSJames Bottomley * @parent: parent of the target (need not be a scsi host) 376884d25ccSJames Bottomley * @channel: target channel number (zero if no channels) 377884d25ccSJames Bottomley * @id: target id number 378884d25ccSJames Bottomley * 379884d25ccSJames Bottomley * Return an existing target if one exists, provided it hasn't already 380884d25ccSJames Bottomley * gone into STARGET_DEL state, otherwise allocate a new target. 381884d25ccSJames Bottomley * 382884d25ccSJames Bottomley * The target is returned with an incremented reference, so the caller 383884d25ccSJames Bottomley * is responsible for both reaping and doing a last put 384884d25ccSJames Bottomley */ 3851da177e4SLinus Torvalds static struct scsi_target *scsi_alloc_target(struct device *parent, 3861da177e4SLinus Torvalds int channel, uint id) 3871da177e4SLinus Torvalds { 3881da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(parent); 3891da177e4SLinus Torvalds struct device *dev = NULL; 3901da177e4SLinus Torvalds unsigned long flags; 3911da177e4SLinus Torvalds const int size = sizeof(struct scsi_target) 3921da177e4SLinus Torvalds + shost->transportt->target_size; 3935c44cd2aSJames.Smart@Emulex.Com struct scsi_target *starget; 3941da177e4SLinus Torvalds struct scsi_target *found_target; 39532f95792SBrian King int error; 3961da177e4SLinus Torvalds 39724669f75SJes Sorensen starget = kzalloc(size, GFP_KERNEL); 3981da177e4SLinus Torvalds if (!starget) { 399cadbd4a5SHarvey Harrison printk(KERN_ERR "%s: allocation failure\n", __func__); 4001da177e4SLinus Torvalds return NULL; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds dev = &starget->dev; 4031da177e4SLinus Torvalds device_initialize(dev); 4041da177e4SLinus Torvalds starget->reap_ref = 1; 4051da177e4SLinus Torvalds dev->parent = get_device(parent); 40671610f55SKay Sievers dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id); 407b0ed4336SHannes Reinecke dev->bus = &scsi_bus_type; 408b0ed4336SHannes Reinecke dev->type = &scsi_target_type; 4091da177e4SLinus Torvalds starget->id = id; 4101da177e4SLinus Torvalds starget->channel = channel; 411f0c0a376SMike Christie starget->can_queue = 0; 4121da177e4SLinus Torvalds INIT_LIST_HEAD(&starget->siblings); 4131da177e4SLinus Torvalds INIT_LIST_HEAD(&starget->devices); 414643eb2d9SJames Bottomley starget->state = STARGET_CREATED; 4157c9d6f16SAlan Stern starget->scsi_level = SCSI_2; 416c53a284fSEdward Goggin starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED; 417ffedb452SJames Bottomley retry: 4181da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds found_target = __scsi_find_target(parent, channel, id); 4211da177e4SLinus Torvalds if (found_target) 4221da177e4SLinus Torvalds goto found; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds list_add_tail(&starget->siblings, &shost->__targets); 4251da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 4261da177e4SLinus Torvalds /* allocate and add */ 427a283bd37SJames Bottomley transport_setup_device(dev); 428a283bd37SJames Bottomley if (shost->hostt->target_alloc) { 42932f95792SBrian King error = shost->hostt->target_alloc(starget); 430a283bd37SJames Bottomley 431a283bd37SJames Bottomley if(error) { 432a283bd37SJames Bottomley dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); 433a283bd37SJames Bottomley /* don't want scsi_target_reap to do the final 434a283bd37SJames Bottomley * put because it will be under the host lock */ 435643eb2d9SJames Bottomley scsi_target_destroy(starget); 436a283bd37SJames Bottomley return NULL; 437a283bd37SJames Bottomley } 438a283bd37SJames Bottomley } 439884d25ccSJames Bottomley get_device(dev); 440a283bd37SJames Bottomley 4411da177e4SLinus Torvalds return starget; 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds found: 4441da177e4SLinus Torvalds found_target->reap_ref++; 4451da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 446ffedb452SJames Bottomley if (found_target->state != STARGET_DEL) { 44712fb8c15SAlan Stern put_device(dev); 4481da177e4SLinus Torvalds return found_target; 4491da177e4SLinus Torvalds } 450ffedb452SJames Bottomley /* Unfortunately, we found a dying target; need to 451ffedb452SJames Bottomley * wait until it's dead before we can get a new one */ 452ffedb452SJames Bottomley put_device(&found_target->dev); 453ffedb452SJames Bottomley flush_scheduled_work(); 454ffedb452SJames Bottomley goto retry; 455ffedb452SJames Bottomley } 4561da177e4SLinus Torvalds 45765f27f38SDavid Howells static void scsi_target_reap_usercontext(struct work_struct *work) 45865110b21SJames Bottomley { 45965f27f38SDavid Howells struct scsi_target *starget = 46065f27f38SDavid Howells container_of(work, struct scsi_target, ew.work); 461863a930aSJames Bottomley 46204333393SJames Bottomley transport_remove_device(&starget->dev); 463863a930aSJames Bottomley device_del(&starget->dev); 464643eb2d9SJames Bottomley scsi_target_destroy(starget); 465863a930aSJames Bottomley } 466863a930aSJames Bottomley 4671da177e4SLinus Torvalds /** 4681da177e4SLinus Torvalds * scsi_target_reap - check to see if target is in use and destroy if not 4691da177e4SLinus Torvalds * @starget: target to be checked 4701da177e4SLinus Torvalds * 4711da177e4SLinus Torvalds * This is used after removing a LUN or doing a last put of the target 4721da177e4SLinus Torvalds * it checks atomically that nothing is using the target and removes 4731da177e4SLinus Torvalds * it if so. 4741da177e4SLinus Torvalds */ 4751da177e4SLinus Torvalds void scsi_target_reap(struct scsi_target *starget) 4761da177e4SLinus Torvalds { 477ffedb452SJames Bottomley struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 478ffedb452SJames Bottomley unsigned long flags; 479643eb2d9SJames Bottomley enum scsi_target_state state; 480f9e8894aSAlan Stern int empty = 0; 481ffedb452SJames Bottomley 482ffedb452SJames Bottomley spin_lock_irqsave(shost->host_lock, flags); 483643eb2d9SJames Bottomley state = starget->state; 484f9e8894aSAlan Stern if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { 485f9e8894aSAlan Stern empty = 1; 486f9e8894aSAlan Stern starget->state = STARGET_DEL; 487f9e8894aSAlan Stern } 488ffedb452SJames Bottomley spin_unlock_irqrestore(shost->host_lock, flags); 489643eb2d9SJames Bottomley 490643eb2d9SJames Bottomley if (!empty) 491643eb2d9SJames Bottomley return; 492643eb2d9SJames Bottomley 493643eb2d9SJames Bottomley BUG_ON(state == STARGET_DEL); 494643eb2d9SJames Bottomley if (state == STARGET_CREATED) 495643eb2d9SJames Bottomley scsi_target_destroy(starget); 496643eb2d9SJames Bottomley else 497ffedb452SJames Bottomley execute_in_process_context(scsi_target_reap_usercontext, 49865f27f38SDavid Howells &starget->ew); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /** 502e5b3cd42SAlan Stern * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string 503e5b3cd42SAlan Stern * @s: INQUIRY result string to sanitize 504e5b3cd42SAlan Stern * @len: length of the string 505e5b3cd42SAlan Stern * 506e5b3cd42SAlan Stern * Description: 507e5b3cd42SAlan Stern * The SCSI spec says that INQUIRY vendor, product, and revision 508e5b3cd42SAlan Stern * strings must consist entirely of graphic ASCII characters, 509e5b3cd42SAlan Stern * padded on the right with spaces. Since not all devices obey 510e5b3cd42SAlan Stern * this rule, we will replace non-graphic or non-ASCII characters 511e5b3cd42SAlan Stern * with spaces. Exception: a NUL character is interpreted as a 512e5b3cd42SAlan Stern * string terminator, so all the following characters are set to 513e5b3cd42SAlan Stern * spaces. 514e5b3cd42SAlan Stern **/ 515e5b3cd42SAlan Stern static void sanitize_inquiry_string(unsigned char *s, int len) 516e5b3cd42SAlan Stern { 517e5b3cd42SAlan Stern int terminated = 0; 518e5b3cd42SAlan Stern 519e5b3cd42SAlan Stern for (; len > 0; (--len, ++s)) { 520e5b3cd42SAlan Stern if (*s == 0) 521e5b3cd42SAlan Stern terminated = 1; 522e5b3cd42SAlan Stern if (terminated || *s < 0x20 || *s > 0x7e) 523e5b3cd42SAlan Stern *s = ' '; 524e5b3cd42SAlan Stern } 525e5b3cd42SAlan Stern } 526e5b3cd42SAlan Stern 527e5b3cd42SAlan Stern /** 5281da177e4SLinus Torvalds * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY 52939216033SJames Bottomley * @sdev: scsi_device to probe 5301da177e4SLinus Torvalds * @inq_result: area to store the INQUIRY result 53139216033SJames Bottomley * @result_len: len of inq_result 5321da177e4SLinus Torvalds * @bflags: store any bflags found here 5331da177e4SLinus Torvalds * 5341da177e4SLinus Torvalds * Description: 53539216033SJames Bottomley * Probe the lun associated with @req using a standard SCSI INQUIRY; 5361da177e4SLinus Torvalds * 53739216033SJames Bottomley * If the INQUIRY is successful, zero is returned and the 5381da177e4SLinus Torvalds * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length 539f64a181dSChristoph Hellwig * are copied to the scsi_device any flags value is stored in *@bflags. 5401da177e4SLinus Torvalds **/ 541e5b3cd42SAlan Stern static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, 54239216033SJames Bottomley int result_len, int *bflags) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 5451da177e4SLinus Torvalds int first_inquiry_len, try_inquiry_len, next_inquiry_len; 5461da177e4SLinus Torvalds int response_len = 0; 54739216033SJames Bottomley int pass, count, result; 5481da177e4SLinus Torvalds struct scsi_sense_hdr sshdr; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds *bflags = 0; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds /* Perform up to 3 passes. The first pass uses a conservative 5531da177e4SLinus Torvalds * transfer length of 36 unless sdev->inquiry_len specifies a 5541da177e4SLinus Torvalds * different value. */ 5551da177e4SLinus Torvalds first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; 5561da177e4SLinus Torvalds try_inquiry_len = first_inquiry_len; 5571da177e4SLinus Torvalds pass = 1; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds next_pass: 5609ccfc756SJames Bottomley SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, 5619ccfc756SJames Bottomley "scsi scan: INQUIRY pass %d length %d\n", 5629ccfc756SJames Bottomley pass, try_inquiry_len)); 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds /* Each pass gets up to three chances to ignore Unit Attention */ 5651da177e4SLinus Torvalds for (count = 0; count < 3; ++count) { 5665cd3bbfaSFUJITA Tomonori int resid; 5675cd3bbfaSFUJITA Tomonori 5681da177e4SLinus Torvalds memset(scsi_cmd, 0, 6); 5691da177e4SLinus Torvalds scsi_cmd[0] = INQUIRY; 5701da177e4SLinus Torvalds scsi_cmd[4] = (unsigned char) try_inquiry_len; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds memset(inq_result, 0, try_inquiry_len); 57339216033SJames Bottomley 57439216033SJames Bottomley result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, 575ea73a9f2SJames Bottomley inq_result, try_inquiry_len, &sshdr, 576f4f4e47eSFUJITA Tomonori HZ / 2 + HZ * scsi_inq_timeout, 3, 5775cd3bbfaSFUJITA Tomonori &resid); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " 5801da177e4SLinus Torvalds "with code 0x%x\n", 58139216033SJames Bottomley result ? "failed" : "successful", result)); 5821da177e4SLinus Torvalds 58339216033SJames Bottomley if (result) { 5841da177e4SLinus Torvalds /* 5851da177e4SLinus Torvalds * not-ready to ready transition [asc/ascq=0x28/0x0] 5861da177e4SLinus Torvalds * or power-on, reset [asc/ascq=0x29/0x0], continue. 5871da177e4SLinus Torvalds * INQUIRY should not yield UNIT_ATTENTION 5881da177e4SLinus Torvalds * but many buggy devices do so anyway. 5891da177e4SLinus Torvalds */ 59039216033SJames Bottomley if ((driver_byte(result) & DRIVER_SENSE) && 591ea73a9f2SJames Bottomley scsi_sense_valid(&sshdr)) { 5921da177e4SLinus Torvalds if ((sshdr.sense_key == UNIT_ATTENTION) && 5931da177e4SLinus Torvalds ((sshdr.asc == 0x28) || 5941da177e4SLinus Torvalds (sshdr.asc == 0x29)) && 5951da177e4SLinus Torvalds (sshdr.ascq == 0)) 5961da177e4SLinus Torvalds continue; 5971da177e4SLinus Torvalds } 5985cd3bbfaSFUJITA Tomonori } else { 5995cd3bbfaSFUJITA Tomonori /* 6005cd3bbfaSFUJITA Tomonori * if nothing was transferred, we try 6015cd3bbfaSFUJITA Tomonori * again. It's a workaround for some USB 6025cd3bbfaSFUJITA Tomonori * devices. 6035cd3bbfaSFUJITA Tomonori */ 6045cd3bbfaSFUJITA Tomonori if (resid == try_inquiry_len) 6055cd3bbfaSFUJITA Tomonori continue; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds break; 6081da177e4SLinus Torvalds } 6091da177e4SLinus Torvalds 61039216033SJames Bottomley if (result == 0) { 611e5b3cd42SAlan Stern sanitize_inquiry_string(&inq_result[8], 8); 612e5b3cd42SAlan Stern sanitize_inquiry_string(&inq_result[16], 16); 613e5b3cd42SAlan Stern sanitize_inquiry_string(&inq_result[32], 4); 614e5b3cd42SAlan Stern 615e5b3cd42SAlan Stern response_len = inq_result[4] + 5; 6161da177e4SLinus Torvalds if (response_len > 255) 6171da177e4SLinus Torvalds response_len = first_inquiry_len; /* sanity */ 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* 6201da177e4SLinus Torvalds * Get any flags for this device. 6211da177e4SLinus Torvalds * 622f64a181dSChristoph Hellwig * XXX add a bflags to scsi_device, and replace the 623f64a181dSChristoph Hellwig * corresponding bit fields in scsi_device, so bflags 6241da177e4SLinus Torvalds * need not be passed as an argument. 6251da177e4SLinus Torvalds */ 6261da177e4SLinus Torvalds *bflags = scsi_get_device_flags(sdev, &inq_result[8], 6271da177e4SLinus Torvalds &inq_result[16]); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds /* When the first pass succeeds we gain information about 6301da177e4SLinus Torvalds * what larger transfer lengths might work. */ 6311da177e4SLinus Torvalds if (pass == 1) { 6321da177e4SLinus Torvalds if (BLIST_INQUIRY_36 & *bflags) 6331da177e4SLinus Torvalds next_inquiry_len = 36; 6341da177e4SLinus Torvalds else if (BLIST_INQUIRY_58 & *bflags) 6351da177e4SLinus Torvalds next_inquiry_len = 58; 6361da177e4SLinus Torvalds else if (sdev->inquiry_len) 6371da177e4SLinus Torvalds next_inquiry_len = sdev->inquiry_len; 6381da177e4SLinus Torvalds else 6391da177e4SLinus Torvalds next_inquiry_len = response_len; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* If more data is available perform the second pass */ 6421da177e4SLinus Torvalds if (next_inquiry_len > try_inquiry_len) { 6431da177e4SLinus Torvalds try_inquiry_len = next_inquiry_len; 6441da177e4SLinus Torvalds pass = 2; 6451da177e4SLinus Torvalds goto next_pass; 6461da177e4SLinus Torvalds } 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds } else if (pass == 2) { 6501da177e4SLinus Torvalds printk(KERN_INFO "scsi scan: %d byte inquiry failed. " 6511da177e4SLinus Torvalds "Consider BLIST_INQUIRY_36 for this device\n", 6521da177e4SLinus Torvalds try_inquiry_len); 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* If this pass failed, the third pass goes back and transfers 6551da177e4SLinus Torvalds * the same amount as we successfully got in the first pass. */ 6561da177e4SLinus Torvalds try_inquiry_len = first_inquiry_len; 6571da177e4SLinus Torvalds pass = 3; 6581da177e4SLinus Torvalds goto next_pass; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds /* If the last transfer attempt got an error, assume the 6621da177e4SLinus Torvalds * peripheral doesn't exist or is dead. */ 66339216033SJames Bottomley if (result) 66439216033SJames Bottomley return -EIO; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds /* Don't report any more data than the device says is valid */ 6671da177e4SLinus Torvalds sdev->inquiry_len = min(try_inquiry_len, response_len); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* 6701da177e4SLinus Torvalds * XXX Abort if the response length is less than 36? If less than 6711da177e4SLinus Torvalds * 32, the lookup of the device flags (above) could be invalid, 6721da177e4SLinus Torvalds * and it would be possible to take an incorrect action - we do 6731da177e4SLinus Torvalds * not want to hang because of a short INQUIRY. On the flip side, 6741da177e4SLinus Torvalds * if the device is spun down or becoming ready (and so it gives a 6751da177e4SLinus Torvalds * short INQUIRY), an abort here prevents any further use of the 6761da177e4SLinus Torvalds * device, including spin up. 6771da177e4SLinus Torvalds * 678e423ee31SAlan Stern * On the whole, the best approach seems to be to assume the first 679e423ee31SAlan Stern * 36 bytes are valid no matter what the device says. That's 680e423ee31SAlan Stern * better than copying < 36 bytes to the inquiry-result buffer 681e423ee31SAlan Stern * and displaying garbage for the Vendor, Product, or Revision 682e423ee31SAlan Stern * strings. 683e423ee31SAlan Stern */ 684e423ee31SAlan Stern if (sdev->inquiry_len < 36) { 685e423ee31SAlan Stern printk(KERN_INFO "scsi scan: INQUIRY result too short (%d)," 686e423ee31SAlan Stern " using 36\n", sdev->inquiry_len); 687e423ee31SAlan Stern sdev->inquiry_len = 36; 688e423ee31SAlan Stern } 689e423ee31SAlan Stern 690e423ee31SAlan Stern /* 6911da177e4SLinus Torvalds * Related to the above issue: 6921da177e4SLinus Torvalds * 6931da177e4SLinus Torvalds * XXX Devices (disk or all?) should be sent a TEST UNIT READY, 6941da177e4SLinus Torvalds * and if not ready, sent a START_STOP to start (maybe spin up) and 6951da177e4SLinus Torvalds * then send the INQUIRY again, since the INQUIRY can change after 6961da177e4SLinus Torvalds * a device is initialized. 6971da177e4SLinus Torvalds * 6981da177e4SLinus Torvalds * Ideally, start a device if explicitly asked to do so. This 6991da177e4SLinus Torvalds * assumes that a device is spun up on power on, spun down on 7001da177e4SLinus Torvalds * request, and then spun up on request. 7011da177e4SLinus Torvalds */ 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* 7041da177e4SLinus Torvalds * The scanning code needs to know the scsi_level, even if no 7051da177e4SLinus Torvalds * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so 7061da177e4SLinus Torvalds * non-zero LUNs can be scanned. 7071da177e4SLinus Torvalds */ 7081da177e4SLinus Torvalds sdev->scsi_level = inq_result[2] & 0x07; 7091da177e4SLinus Torvalds if (sdev->scsi_level >= 2 || 7101da177e4SLinus Torvalds (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) 7111da177e4SLinus Torvalds sdev->scsi_level++; 7126f3a2024SJames Bottomley sdev->sdev_target->scsi_level = sdev->scsi_level; 7131da177e4SLinus Torvalds 71439216033SJames Bottomley return 0; 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds /** 718f64a181dSChristoph Hellwig * scsi_add_lun - allocate and fully initialze a scsi_device 7196d877688SMatthew Wilcox * @sdev: holds information to be stored in the new scsi_device 7201da177e4SLinus Torvalds * @inq_result: holds the result of a previous INQUIRY to the LUN 7211da177e4SLinus Torvalds * @bflags: black/white list flag 7226d877688SMatthew Wilcox * @async: 1 if this device is being scanned asynchronously 7231da177e4SLinus Torvalds * 7241da177e4SLinus Torvalds * Description: 7256d877688SMatthew Wilcox * Initialize the scsi_device @sdev. Optionally set fields based 7266d877688SMatthew Wilcox * on values in *@bflags. 7271da177e4SLinus Torvalds * 7281da177e4SLinus Torvalds * Return: 729f64a181dSChristoph Hellwig * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device 730f64a181dSChristoph Hellwig * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized 7311da177e4SLinus Torvalds **/ 732e5b3cd42SAlan Stern static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, 7333e082a91SMatthew Wilcox int *bflags, int async) 7341da177e4SLinus Torvalds { 7356f4267e3SJames Bottomley int ret; 7366f4267e3SJames Bottomley 7371da177e4SLinus Torvalds /* 7381da177e4SLinus Torvalds * XXX do not save the inquiry, since it can change underneath us, 7391da177e4SLinus Torvalds * save just vendor/model/rev. 7401da177e4SLinus Torvalds * 7411da177e4SLinus Torvalds * Rather than save it and have an ioctl that retrieves the saved 7421da177e4SLinus Torvalds * value, have an ioctl that executes the same INQUIRY code used 7431da177e4SLinus Torvalds * in scsi_probe_lun, let user level programs doing INQUIRY 7441da177e4SLinus Torvalds * scanning run at their own risk, or supply a user level program 7451da177e4SLinus Torvalds * that can correctly scan. 7461da177e4SLinus Torvalds */ 7471da177e4SLinus Torvalds 74809123d23SAlan Stern /* 74909123d23SAlan Stern * Copy at least 36 bytes of INQUIRY data, so that we don't 75009123d23SAlan Stern * dereference unallocated memory when accessing the Vendor, 75109123d23SAlan Stern * Product, and Revision strings. Badly behaved devices may set 75209123d23SAlan Stern * the INQUIRY Additional Length byte to a small value, indicating 75309123d23SAlan Stern * these strings are invalid, but often they contain plausible data 75409123d23SAlan Stern * nonetheless. It doesn't matter if the device sent < 36 bytes 75509123d23SAlan Stern * total, since scsi_probe_lun() initializes inq_result with 0s. 75609123d23SAlan Stern */ 75709123d23SAlan Stern sdev->inquiry = kmemdup(inq_result, 75809123d23SAlan Stern max_t(size_t, sdev->inquiry_len, 36), 75909123d23SAlan Stern GFP_ATOMIC); 76009123d23SAlan Stern if (sdev->inquiry == NULL) 76109123d23SAlan Stern return SCSI_SCAN_NO_RESPONSE; 76209123d23SAlan Stern 7631da177e4SLinus Torvalds sdev->vendor = (char *) (sdev->inquiry + 8); 7641da177e4SLinus Torvalds sdev->model = (char *) (sdev->inquiry + 16); 7651da177e4SLinus Torvalds sdev->rev = (char *) (sdev->inquiry + 32); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds if (*bflags & BLIST_ISROM) { 7686d877688SMatthew Wilcox sdev->type = TYPE_ROM; 7696d877688SMatthew Wilcox sdev->removable = 1; 7706d877688SMatthew Wilcox } else { 7716d877688SMatthew Wilcox sdev->type = (inq_result[0] & 0x1f); 7726d877688SMatthew Wilcox sdev->removable = (inq_result[1] & 0x80) >> 7; 7736d877688SMatthew Wilcox } 7741da177e4SLinus Torvalds 7756d877688SMatthew Wilcox switch (sdev->type) { 776ddaf6fc8SJames Bottomley case TYPE_RBC: 7771da177e4SLinus Torvalds case TYPE_TAPE: 7781da177e4SLinus Torvalds case TYPE_DISK: 7791da177e4SLinus Torvalds case TYPE_PRINTER: 7801da177e4SLinus Torvalds case TYPE_MOD: 7811da177e4SLinus Torvalds case TYPE_PROCESSOR: 7821da177e4SLinus Torvalds case TYPE_SCANNER: 7831da177e4SLinus Torvalds case TYPE_MEDIUM_CHANGER: 7841da177e4SLinus Torvalds case TYPE_ENCLOSURE: 7851da177e4SLinus Torvalds case TYPE_COMM: 7864d7db04aSJames Bottomley case TYPE_RAID: 78782443a58SBoaz Harrosh case TYPE_OSD: 7881da177e4SLinus Torvalds sdev->writeable = 1; 7891da177e4SLinus Torvalds break; 7901da177e4SLinus Torvalds case TYPE_ROM: 791ddaf6fc8SJames Bottomley case TYPE_WORM: 7921da177e4SLinus Torvalds sdev->writeable = 0; 7931da177e4SLinus Torvalds break; 7941da177e4SLinus Torvalds default: 7951da177e4SLinus Torvalds printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); 7961da177e4SLinus Torvalds } 7971da177e4SLinus Torvalds 7986d877688SMatthew Wilcox if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { 7996d877688SMatthew Wilcox /* RBC and MMC devices can return SCSI-3 compliance and yet 8006d877688SMatthew Wilcox * still not support REPORT LUNS, so make them act as 8016d877688SMatthew Wilcox * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is 8026d877688SMatthew Wilcox * specifically set */ 8036d877688SMatthew Wilcox if ((*bflags & BLIST_REPORTLUN2) == 0) 8046d877688SMatthew Wilcox *bflags |= BLIST_NOREPORTLUN; 8056d877688SMatthew Wilcox } 8066d877688SMatthew Wilcox 8071da177e4SLinus Torvalds /* 8081da177e4SLinus Torvalds * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI 8091da177e4SLinus Torvalds * spec says: The device server is capable of supporting the 8101da177e4SLinus Torvalds * specified peripheral device type on this logical unit. However, 8111da177e4SLinus Torvalds * the physical device is not currently connected to this logical 8121da177e4SLinus Torvalds * unit. 8131da177e4SLinus Torvalds * 8141da177e4SLinus Torvalds * The above is vague, as it implies that we could treat 001 and 8151da177e4SLinus Torvalds * 011 the same. Stay compatible with previous code, and create a 816f64a181dSChristoph Hellwig * scsi_device for a PQ of 1 8171da177e4SLinus Torvalds * 8181da177e4SLinus Torvalds * Don't set the device offline here; rather let the upper 8191da177e4SLinus Torvalds * level drivers eval the PQ to decide whether they should 8201da177e4SLinus Torvalds * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. 8211da177e4SLinus Torvalds */ 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvalds sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; 8241da177e4SLinus Torvalds sdev->lockable = sdev->removable; 8251da177e4SLinus Torvalds sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); 8261da177e4SLinus Torvalds 8276d877688SMatthew Wilcox if (sdev->scsi_level >= SCSI_3 || 8286d877688SMatthew Wilcox (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) 8291da177e4SLinus Torvalds sdev->ppr = 1; 8301da177e4SLinus Torvalds if (inq_result[7] & 0x60) 8311da177e4SLinus Torvalds sdev->wdtr = 1; 8321da177e4SLinus Torvalds if (inq_result[7] & 0x10) 8331da177e4SLinus Torvalds sdev->sdtr = 1; 8341da177e4SLinus Torvalds 83519ac0db3SJames Bottomley sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " 8364ff36718SMatthew Wilcox "ANSI: %d%s\n", scsi_device_type(sdev->type), 8374ff36718SMatthew Wilcox sdev->vendor, sdev->model, sdev->rev, 8384ff36718SMatthew Wilcox sdev->inq_periph_qual, inq_result[2] & 0x07, 8394ff36718SMatthew Wilcox (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); 8404ff36718SMatthew Wilcox 8411da177e4SLinus Torvalds if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && 8421da177e4SLinus Torvalds !(*bflags & BLIST_NOTQ)) 8431da177e4SLinus Torvalds sdev->tagged_supported = 1; 8446d877688SMatthew Wilcox 8451da177e4SLinus Torvalds /* 8461da177e4SLinus Torvalds * Some devices (Texel CD ROM drives) have handshaking problems 8471da177e4SLinus Torvalds * when used with the Seagate controllers. borken is initialized 8481da177e4SLinus Torvalds * to 1, and then set it to 0 here. 8491da177e4SLinus Torvalds */ 8501da177e4SLinus Torvalds if ((*bflags & BLIST_BORKEN) == 0) 8511da177e4SLinus Torvalds sdev->borken = 0; 8521da177e4SLinus Torvalds 8536d877688SMatthew Wilcox if (*bflags & BLIST_NO_ULD_ATTACH) 8546d877688SMatthew Wilcox sdev->no_uld_attach = 1; 8556d877688SMatthew Wilcox 8561da177e4SLinus Torvalds /* 8571da177e4SLinus Torvalds * Apparently some really broken devices (contrary to the SCSI 8581da177e4SLinus Torvalds * standards) need to be selected without asserting ATN 8591da177e4SLinus Torvalds */ 8601da177e4SLinus Torvalds if (*bflags & BLIST_SELECT_NO_ATN) 8611da177e4SLinus Torvalds sdev->select_no_atn = 1; 8621da177e4SLinus Torvalds 8631da177e4SLinus Torvalds /* 8644d7db04aSJames Bottomley * Maximum 512 sector transfer length 8654d7db04aSJames Bottomley * broken RA4x00 Compaq Disk Array 8664d7db04aSJames Bottomley */ 8674d7db04aSJames Bottomley if (*bflags & BLIST_MAX_512) 868086fa5ffSMartin K. Petersen blk_queue_max_hw_sectors(sdev->request_queue, 512); 8694d7db04aSJames Bottomley 8704d7db04aSJames Bottomley /* 8711da177e4SLinus Torvalds * Some devices may not want to have a start command automatically 8721da177e4SLinus Torvalds * issued when a device is added. 8731da177e4SLinus Torvalds */ 8741da177e4SLinus Torvalds if (*bflags & BLIST_NOSTARTONADD) 8751da177e4SLinus Torvalds sdev->no_start_on_add = 1; 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds if (*bflags & BLIST_SINGLELUN) 87825d7c363STony Battersby scsi_target(sdev)->single_lun = 1; 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds sdev->use_10_for_rw = 1; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds if (*bflags & BLIST_MS_SKIP_PAGE_08) 8831da177e4SLinus Torvalds sdev->skip_ms_page_8 = 1; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds if (*bflags & BLIST_MS_SKIP_PAGE_3F) 8861da177e4SLinus Torvalds sdev->skip_ms_page_3f = 1; 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds if (*bflags & BLIST_USE_10_BYTE_MS) 8891da177e4SLinus Torvalds sdev->use_10_for_ms = 1; 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds /* set the device running here so that slave configure 8921da177e4SLinus Torvalds * may do I/O */ 8936f4267e3SJames Bottomley ret = scsi_device_set_state(sdev, SDEV_RUNNING); 8946f4267e3SJames Bottomley if (ret) { 8956f4267e3SJames Bottomley ret = scsi_device_set_state(sdev, SDEV_BLOCK); 8966f4267e3SJames Bottomley 8976f4267e3SJames Bottomley if (ret) { 8986f4267e3SJames Bottomley sdev_printk(KERN_ERR, sdev, 8996f4267e3SJames Bottomley "in wrong state %s to complete scan\n", 9006f4267e3SJames Bottomley scsi_device_state_name(sdev->sdev_state)); 9016f4267e3SJames Bottomley return SCSI_SCAN_NO_RESPONSE; 9026f4267e3SJames Bottomley } 9036f4267e3SJames Bottomley } 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds if (*bflags & BLIST_MS_192_BYTES_FOR_3F) 9061da177e4SLinus Torvalds sdev->use_192_bytes_for_3f = 1; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds if (*bflags & BLIST_NOT_LOCKABLE) 9091da177e4SLinus Torvalds sdev->lockable = 0; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds if (*bflags & BLIST_RETRY_HWERROR) 9121da177e4SLinus Torvalds sdev->retry_hwerror = 1; 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds transport_configure_device(&sdev->sdev_gendev); 9151da177e4SLinus Torvalds 91693805091SChristoph Hellwig if (sdev->host->hostt->slave_configure) { 9176f4267e3SJames Bottomley ret = sdev->host->hostt->slave_configure(sdev); 91893805091SChristoph Hellwig if (ret) { 91993805091SChristoph Hellwig /* 92093805091SChristoph Hellwig * if LLDD reports slave not present, don't clutter 92193805091SChristoph Hellwig * console with alloc failure messages 92293805091SChristoph Hellwig */ 92393805091SChristoph Hellwig if (ret != -ENXIO) { 92493805091SChristoph Hellwig sdev_printk(KERN_ERR, sdev, 92593805091SChristoph Hellwig "failed to configure device\n"); 92693805091SChristoph Hellwig } 92793805091SChristoph Hellwig return SCSI_SCAN_NO_RESPONSE; 92893805091SChristoph Hellwig } 92993805091SChristoph Hellwig } 9301da177e4SLinus Torvalds 9314a84067dSVasu Dev sdev->max_queue_depth = sdev->queue_depth; 9324a84067dSVasu Dev 9331da177e4SLinus Torvalds /* 9341da177e4SLinus Torvalds * Ok, the device is now all set up, we can 9351da177e4SLinus Torvalds * register it and tell the rest of the kernel 9361da177e4SLinus Torvalds * about it. 9371da177e4SLinus Torvalds */ 9383e082a91SMatthew Wilcox if (!async && scsi_sysfs_add_sdev(sdev) != 0) 939b24b1033SAlan Stern return SCSI_SCAN_NO_RESPONSE; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds return SCSI_SCAN_LUN_PRESENT; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds 944c5f2e640Sakpm@osdl.org #ifdef CONFIG_SCSI_LOGGING 9456c7154c9SKurt Garloff /** 946eb44820cSRob Landley * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace 9476c7154c9SKurt Garloff * @buf: Output buffer with at least end-first+1 bytes of space 9486c7154c9SKurt Garloff * @inq: Inquiry buffer (input) 9496c7154c9SKurt Garloff * @first: Offset of string into inq 9506c7154c9SKurt Garloff * @end: Index after last character in inq 9516c7154c9SKurt Garloff */ 9526c7154c9SKurt Garloff static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, 9536c7154c9SKurt Garloff unsigned first, unsigned end) 9546c7154c9SKurt Garloff { 9556c7154c9SKurt Garloff unsigned term = 0, idx; 956c5f2e640Sakpm@osdl.org 957c5f2e640Sakpm@osdl.org for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { 958c5f2e640Sakpm@osdl.org if (inq[idx+first] > ' ') { 9596c7154c9SKurt Garloff buf[idx] = inq[idx+first]; 9606c7154c9SKurt Garloff term = idx+1; 9616c7154c9SKurt Garloff } else { 9626c7154c9SKurt Garloff buf[idx] = ' '; 9636c7154c9SKurt Garloff } 9646c7154c9SKurt Garloff } 9656c7154c9SKurt Garloff buf[term] = 0; 9666c7154c9SKurt Garloff return buf; 9676c7154c9SKurt Garloff } 968c5f2e640Sakpm@osdl.org #endif 9696f3a2024SJames Bottomley 9701da177e4SLinus Torvalds /** 9711da177e4SLinus Torvalds * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it 9721da177e4SLinus Torvalds * @starget: pointer to target device structure 9731da177e4SLinus Torvalds * @lun: LUN of target device 9741da177e4SLinus Torvalds * @bflagsp: store bflags here if not NULL 975eb44820cSRob Landley * @sdevp: probe the LUN corresponding to this scsi_device 976eb44820cSRob Landley * @rescan: if nonzero skip some code only needed on first scan 977eb44820cSRob Landley * @hostdata: passed to scsi_alloc_sdev() 9781da177e4SLinus Torvalds * 9791da177e4SLinus Torvalds * Description: 9801da177e4SLinus Torvalds * Call scsi_probe_lun, if a LUN with an attached device is found, 9811da177e4SLinus Torvalds * allocate and set it up by calling scsi_add_lun. 9821da177e4SLinus Torvalds * 9831da177e4SLinus Torvalds * Return: 984f64a181dSChristoph Hellwig * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device 9851da177e4SLinus Torvalds * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is 9861da177e4SLinus Torvalds * attached at the LUN 987f64a181dSChristoph Hellwig * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized 9881da177e4SLinus Torvalds **/ 9891da177e4SLinus Torvalds static int scsi_probe_and_add_lun(struct scsi_target *starget, 9901da177e4SLinus Torvalds uint lun, int *bflagsp, 9911da177e4SLinus Torvalds struct scsi_device **sdevp, int rescan, 9921da177e4SLinus Torvalds void *hostdata) 9931da177e4SLinus Torvalds { 9941da177e4SLinus Torvalds struct scsi_device *sdev; 9951da177e4SLinus Torvalds unsigned char *result; 99639216033SJames Bottomley int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; 9971da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 9981da177e4SLinus Torvalds 9991da177e4SLinus Torvalds /* 10001da177e4SLinus Torvalds * The rescan flag is used as an optimization, the first scan of a 10011da177e4SLinus Torvalds * host adapter calls into here with rescan == 0. 10021da177e4SLinus Torvalds */ 10031da177e4SLinus Torvalds sdev = scsi_device_lookup_by_target(starget, lun); 10041da177e4SLinus Torvalds if (sdev) { 10050f1d87a2SJames Bottomley if (rescan || !scsi_device_created(sdev)) { 10061da177e4SLinus Torvalds SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO 10071da177e4SLinus Torvalds "scsi scan: device exists on %s\n", 100871610f55SKay Sievers dev_name(&sdev->sdev_gendev))); 10091da177e4SLinus Torvalds if (sdevp) 10101da177e4SLinus Torvalds *sdevp = sdev; 10111da177e4SLinus Torvalds else 10121da177e4SLinus Torvalds scsi_device_put(sdev); 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds if (bflagsp) 10151da177e4SLinus Torvalds *bflagsp = scsi_get_device_flags(sdev, 10161da177e4SLinus Torvalds sdev->vendor, 10171da177e4SLinus Torvalds sdev->model); 10181da177e4SLinus Torvalds return SCSI_SCAN_LUN_PRESENT; 10191da177e4SLinus Torvalds } 10206f3a2024SJames Bottomley scsi_device_put(sdev); 10216f3a2024SJames Bottomley } else 10221da177e4SLinus Torvalds sdev = scsi_alloc_sdev(starget, lun, hostdata); 10231da177e4SLinus Torvalds if (!sdev) 10241da177e4SLinus Torvalds goto out; 102539216033SJames Bottomley 102639216033SJames Bottomley result = kmalloc(result_len, GFP_ATOMIC | 1027bc86120aSAl Viro ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); 10281da177e4SLinus Torvalds if (!result) 102939216033SJames Bottomley goto out_free_sdev; 10301da177e4SLinus Torvalds 103139216033SJames Bottomley if (scsi_probe_lun(sdev, result, result_len, &bflags)) 10321da177e4SLinus Torvalds goto out_free_result; 10331da177e4SLinus Torvalds 10344186ab19SKurt Garloff if (bflagsp) 10354186ab19SKurt Garloff *bflagsp = bflags; 10361da177e4SLinus Torvalds /* 10371da177e4SLinus Torvalds * result contains valid SCSI INQUIRY data. 10381da177e4SLinus Torvalds */ 103913f7e5acSKurt Garloff if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { 10401da177e4SLinus Torvalds /* 10411da177e4SLinus Torvalds * For a Peripheral qualifier 3 (011b), the SCSI 10421da177e4SLinus Torvalds * spec says: The device server is not capable of 10431da177e4SLinus Torvalds * supporting a physical device on this logical 10441da177e4SLinus Torvalds * unit. 10451da177e4SLinus Torvalds * 10461da177e4SLinus Torvalds * For disks, this implies that there is no 10471da177e4SLinus Torvalds * logical disk configured at sdev->lun, but there 10481da177e4SLinus Torvalds * is a target id responding. 10491da177e4SLinus Torvalds */ 10506c7154c9SKurt Garloff SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" 10516c7154c9SKurt Garloff " peripheral qualifier of 3, device not" 10526c7154c9SKurt Garloff " added\n")) 10536c7154c9SKurt Garloff if (lun == 0) { 1054c5f2e640Sakpm@osdl.org SCSI_LOG_SCAN_BUS(1, { 1055c5f2e640Sakpm@osdl.org unsigned char vend[9]; 1056c5f2e640Sakpm@osdl.org unsigned char mod[17]; 1057c5f2e640Sakpm@osdl.org 1058c5f2e640Sakpm@osdl.org sdev_printk(KERN_INFO, sdev, 10596c7154c9SKurt Garloff "scsi scan: consider passing scsi_mod." 10603424a65dSKurt Garloff "dev_flags=%s:%s:0x240 or 0x1000240\n", 10616c7154c9SKurt Garloff scsi_inq_str(vend, result, 8, 16), 1062c5f2e640Sakpm@osdl.org scsi_inq_str(mod, result, 16, 32)); 1063c5f2e640Sakpm@osdl.org }); 1064643eb2d9SJames Bottomley 10656c7154c9SKurt Garloff } 10666c7154c9SKurt Garloff 10671da177e4SLinus Torvalds res = SCSI_SCAN_TARGET_PRESENT; 10681da177e4SLinus Torvalds goto out_free_result; 10691da177e4SLinus Torvalds } 10701da177e4SLinus Torvalds 10711bfc5d9dSAlan Stern /* 107284961f28Sdave wysochanski * Some targets may set slight variations of PQ and PDT to signal 107384961f28Sdave wysochanski * that no LUN is present, so don't add sdev in these cases. 107484961f28Sdave wysochanski * Two specific examples are: 107584961f28Sdave wysochanski * 1) NetApp targets: return PQ=1, PDT=0x1f 107684961f28Sdave wysochanski * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" 107784961f28Sdave wysochanski * in the UFI 1.0 spec (we cannot rely on reserved bits). 107884961f28Sdave wysochanski * 107984961f28Sdave wysochanski * References: 108084961f28Sdave wysochanski * 1) SCSI SPC-3, pp. 145-146 108184961f28Sdave wysochanski * PQ=1: "A peripheral device having the specified peripheral 108284961f28Sdave wysochanski * device type is not connected to this logical unit. However, the 108384961f28Sdave wysochanski * device server is capable of supporting the specified peripheral 108484961f28Sdave wysochanski * device type on this logical unit." 108584961f28Sdave wysochanski * PDT=0x1f: "Unknown or no device type" 108684961f28Sdave wysochanski * 2) USB UFI 1.0, p. 20 108784961f28Sdave wysochanski * PDT=00h Direct-access device (floppy) 108884961f28Sdave wysochanski * PDT=1Fh none (no FDD connected to the requested logical unit) 10891bfc5d9dSAlan Stern */ 109084961f28Sdave wysochanski if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && 109101b291bdSJames Bottomley (result[0] & 0x1f) == 0x1f && 109201b291bdSJames Bottomley !scsi_is_wlun(lun)) { 10931bfc5d9dSAlan Stern SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO 10941bfc5d9dSAlan Stern "scsi scan: peripheral device type" 10951bfc5d9dSAlan Stern " of 31, no device added\n")); 10961bfc5d9dSAlan Stern res = SCSI_SCAN_TARGET_PRESENT; 10971bfc5d9dSAlan Stern goto out_free_result; 10981bfc5d9dSAlan Stern } 10991bfc5d9dSAlan Stern 11003e082a91SMatthew Wilcox res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); 11011da177e4SLinus Torvalds if (res == SCSI_SCAN_LUN_PRESENT) { 11021da177e4SLinus Torvalds if (bflags & BLIST_KEY) { 11031da177e4SLinus Torvalds sdev->lockable = 0; 110439216033SJames Bottomley scsi_unlock_floptical(sdev, result); 11051da177e4SLinus Torvalds } 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds out_free_result: 11091da177e4SLinus Torvalds kfree(result); 11101da177e4SLinus Torvalds out_free_sdev: 11111da177e4SLinus Torvalds if (res == SCSI_SCAN_LUN_PRESENT) { 11121da177e4SLinus Torvalds if (sdevp) { 1113b70d37bfSAlan Stern if (scsi_device_get(sdev) == 0) { 11141da177e4SLinus Torvalds *sdevp = sdev; 1115b70d37bfSAlan Stern } else { 1116b70d37bfSAlan Stern __scsi_remove_device(sdev); 1117b70d37bfSAlan Stern res = SCSI_SCAN_NO_RESPONSE; 1118b70d37bfSAlan Stern } 11191da177e4SLinus Torvalds } 11206f3a2024SJames Bottomley } else 1121860dc736SJames Bottomley __scsi_remove_device(sdev); 11221da177e4SLinus Torvalds out: 11231da177e4SLinus Torvalds return res; 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds /** 11271da177e4SLinus Torvalds * scsi_sequential_lun_scan - sequentially scan a SCSI target 11281da177e4SLinus Torvalds * @starget: pointer to target structure to scan 11291da177e4SLinus Torvalds * @bflags: black/white list flag for LUN 0 1130eb44820cSRob Landley * @scsi_level: Which version of the standard does this device adhere to 1131eb44820cSRob Landley * @rescan: passed to scsi_probe_add_lun() 11321da177e4SLinus Torvalds * 11331da177e4SLinus Torvalds * Description: 11341da177e4SLinus Torvalds * Generally, scan from LUN 1 (LUN 0 is assumed to already have been 11351da177e4SLinus Torvalds * scanned) to some maximum lun until a LUN is found with no device 11361da177e4SLinus Torvalds * attached. Use the bflags to figure out any oddities. 11371da177e4SLinus Torvalds * 11381da177e4SLinus Torvalds * Modifies sdevscan->lun. 11391da177e4SLinus Torvalds **/ 11401da177e4SLinus Torvalds static void scsi_sequential_lun_scan(struct scsi_target *starget, 11414186ab19SKurt Garloff int bflags, int scsi_level, int rescan) 11421da177e4SLinus Torvalds { 11431da177e4SLinus Torvalds unsigned int sparse_lun, lun, max_dev_lun; 11441da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" 114771610f55SKay Sievers "%s\n", dev_name(&starget->dev))); 11481da177e4SLinus Torvalds 11491da177e4SLinus Torvalds max_dev_lun = min(max_scsi_luns, shost->max_lun); 11501da177e4SLinus Torvalds /* 11511da177e4SLinus Torvalds * If this device is known to support sparse multiple units, 11521da177e4SLinus Torvalds * override the other settings, and scan all of them. Normally, 11531da177e4SLinus Torvalds * SCSI-3 devices should be scanned via the REPORT LUNS. 11541da177e4SLinus Torvalds */ 11551da177e4SLinus Torvalds if (bflags & BLIST_SPARSELUN) { 11561da177e4SLinus Torvalds max_dev_lun = shost->max_lun; 11571da177e4SLinus Torvalds sparse_lun = 1; 11581da177e4SLinus Torvalds } else 11591da177e4SLinus Torvalds sparse_lun = 0; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds /* 11621da177e4SLinus Torvalds * If less than SCSI_1_CSS, and no special lun scaning, stop 11631da177e4SLinus Torvalds * scanning; this matches 2.4 behaviour, but could just be a bug 11641da177e4SLinus Torvalds * (to continue scanning a SCSI_1_CSS device). 11651da177e4SLinus Torvalds * 11661da177e4SLinus Torvalds * This test is broken. We might not have any device on lun0 for 11671da177e4SLinus Torvalds * a sparselun device, and if that's the case then how would we 11681da177e4SLinus Torvalds * know the real scsi_level, eh? It might make sense to just not 11691da177e4SLinus Torvalds * scan any SCSI_1 device for non-0 luns, but that check would best 11701da177e4SLinus Torvalds * go into scsi_alloc_sdev() and just have it return null when asked 11711da177e4SLinus Torvalds * to alloc an sdev for lun > 0 on an already found SCSI_1 device. 11721da177e4SLinus Torvalds * 11731da177e4SLinus Torvalds if ((sdevscan->scsi_level < SCSI_1_CCS) && 11741da177e4SLinus Torvalds ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) 11751da177e4SLinus Torvalds == 0)) 11761da177e4SLinus Torvalds return; 11771da177e4SLinus Torvalds */ 11781da177e4SLinus Torvalds /* 11791da177e4SLinus Torvalds * If this device is known to support multiple units, override 11801da177e4SLinus Torvalds * the other settings, and scan all of them. 11811da177e4SLinus Torvalds */ 11821da177e4SLinus Torvalds if (bflags & BLIST_FORCELUN) 11831da177e4SLinus Torvalds max_dev_lun = shost->max_lun; 11841da177e4SLinus Torvalds /* 11851da177e4SLinus Torvalds * REGAL CDC-4X: avoid hang after LUN 4 11861da177e4SLinus Torvalds */ 11871da177e4SLinus Torvalds if (bflags & BLIST_MAX5LUN) 11881da177e4SLinus Torvalds max_dev_lun = min(5U, max_dev_lun); 11891da177e4SLinus Torvalds /* 11901da177e4SLinus Torvalds * Do not scan SCSI-2 or lower device past LUN 7, unless 11911da177e4SLinus Torvalds * BLIST_LARGELUN. 11921da177e4SLinus Torvalds */ 11931da177e4SLinus Torvalds if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) 11941da177e4SLinus Torvalds max_dev_lun = min(8U, max_dev_lun); 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds /* 11971da177e4SLinus Torvalds * We have already scanned LUN 0, so start at LUN 1. Keep scanning 11981da177e4SLinus Torvalds * until we reach the max, or no LUN is found and we are not 11991da177e4SLinus Torvalds * sparse_lun. 12001da177e4SLinus Torvalds */ 12011da177e4SLinus Torvalds for (lun = 1; lun < max_dev_lun; ++lun) 12021da177e4SLinus Torvalds if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, 12031da177e4SLinus Torvalds NULL) != SCSI_SCAN_LUN_PRESENT) && 12041da177e4SLinus Torvalds !sparse_lun) 12051da177e4SLinus Torvalds return; 12061da177e4SLinus Torvalds } 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds /** 12099f6aa575SRandy Dunlap * scsilun_to_int - convert a scsi_lun to an int 12101da177e4SLinus Torvalds * @scsilun: struct scsi_lun to be converted. 12111da177e4SLinus Torvalds * 12121da177e4SLinus Torvalds * Description: 12131da177e4SLinus Torvalds * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered 12141da177e4SLinus Torvalds * integer, and return the result. The caller must check for 12151da177e4SLinus Torvalds * truncation before using this function. 12161da177e4SLinus Torvalds * 12171da177e4SLinus Torvalds * Notes: 12181da177e4SLinus Torvalds * The struct scsi_lun is assumed to be four levels, with each level 12191da177e4SLinus Torvalds * effectively containing a SCSI byte-ordered (big endian) short; the 12201da177e4SLinus Torvalds * addressing bits of each level are ignored (the highest two bits). 12211da177e4SLinus Torvalds * For a description of the LUN format, post SCSI-3 see the SCSI 12221da177e4SLinus Torvalds * Architecture Model, for SCSI-3 see the SCSI Controller Commands. 12231da177e4SLinus Torvalds * 12241da177e4SLinus Torvalds * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns 12251da177e4SLinus Torvalds * the integer: 0x0b030a04 12261da177e4SLinus Torvalds **/ 1227462b7859SChristof Schmitt int scsilun_to_int(struct scsi_lun *scsilun) 12281da177e4SLinus Torvalds { 12291da177e4SLinus Torvalds int i; 12301da177e4SLinus Torvalds unsigned int lun; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds lun = 0; 12331da177e4SLinus Torvalds for (i = 0; i < sizeof(lun); i += 2) 12341da177e4SLinus Torvalds lun = lun | (((scsilun->scsi_lun[i] << 8) | 12351da177e4SLinus Torvalds scsilun->scsi_lun[i + 1]) << (i * 8)); 12361da177e4SLinus Torvalds return lun; 12371da177e4SLinus Torvalds } 1238462b7859SChristof Schmitt EXPORT_SYMBOL(scsilun_to_int); 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds /** 12419f6aa575SRandy Dunlap * int_to_scsilun - reverts an int into a scsi_lun 1242eb44820cSRob Landley * @lun: integer to be reverted 12432f4701d8SJames.Smart@Emulex.Com * @scsilun: struct scsi_lun to be set. 12442f4701d8SJames.Smart@Emulex.Com * 12452f4701d8SJames.Smart@Emulex.Com * Description: 12462f4701d8SJames.Smart@Emulex.Com * Reverts the functionality of the scsilun_to_int, which packed 12472f4701d8SJames.Smart@Emulex.Com * an 8-byte lun value into an int. This routine unpacks the int 12482f4701d8SJames.Smart@Emulex.Com * back into the lun value. 12492f4701d8SJames.Smart@Emulex.Com * Note: the scsilun_to_int() routine does not truly handle all 12502f4701d8SJames.Smart@Emulex.Com * 8bytes of the lun value. This functions restores only as much 12512f4701d8SJames.Smart@Emulex.Com * as was set by the routine. 12522f4701d8SJames.Smart@Emulex.Com * 12532f4701d8SJames.Smart@Emulex.Com * Notes: 12542f4701d8SJames.Smart@Emulex.Com * Given an integer : 0x0b030a04, this function returns a 12552f4701d8SJames.Smart@Emulex.Com * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 12562f4701d8SJames.Smart@Emulex.Com * 12572f4701d8SJames.Smart@Emulex.Com **/ 12582f4701d8SJames.Smart@Emulex.Com void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) 12592f4701d8SJames.Smart@Emulex.Com { 12602f4701d8SJames.Smart@Emulex.Com int i; 12612f4701d8SJames.Smart@Emulex.Com 12622f4701d8SJames.Smart@Emulex.Com memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); 12632f4701d8SJames.Smart@Emulex.Com 12642f4701d8SJames.Smart@Emulex.Com for (i = 0; i < sizeof(lun); i += 2) { 12652f4701d8SJames.Smart@Emulex.Com scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; 12662f4701d8SJames.Smart@Emulex.Com scsilun->scsi_lun[i+1] = lun & 0xFF; 12672f4701d8SJames.Smart@Emulex.Com lun = lun >> 16; 12682f4701d8SJames.Smart@Emulex.Com } 12692f4701d8SJames.Smart@Emulex.Com } 12702f4701d8SJames.Smart@Emulex.Com EXPORT_SYMBOL(int_to_scsilun); 12712f4701d8SJames.Smart@Emulex.Com 12722f4701d8SJames.Smart@Emulex.Com /** 12731da177e4SLinus Torvalds * scsi_report_lun_scan - Scan using SCSI REPORT LUN results 1274eb44820cSRob Landley * @starget: which target 1275eb44820cSRob Landley * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN 1276eb44820cSRob Landley * @rescan: nonzero if we can skip code only needed on first scan 12771da177e4SLinus Torvalds * 12781da177e4SLinus Torvalds * Description: 1279eb44820cSRob Landley * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. 1280eb44820cSRob Landley * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. 12811da177e4SLinus Torvalds * 1282eb44820cSRob Landley * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 1283eb44820cSRob Landley * LUNs even if it's older than SCSI-3. 1284eb44820cSRob Landley * If BLIST_NOREPORTLUN is set, return 1 always. 1285eb44820cSRob Landley * If BLIST_NOLUN is set, return 0 always. 128609b6b51bSAlan Stern * If starget->no_report_luns is set, return 1 always. 12871da177e4SLinus Torvalds * 12881da177e4SLinus Torvalds * Return: 12891da177e4SLinus Torvalds * 0: scan completed (or no memory, so further scanning is futile) 1290eb44820cSRob Landley * 1: could not scan with REPORT LUN 12911da177e4SLinus Torvalds **/ 12926f3a2024SJames Bottomley static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, 12931da177e4SLinus Torvalds int rescan) 12941da177e4SLinus Torvalds { 12951da177e4SLinus Torvalds char devname[64]; 12961da177e4SLinus Torvalds unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 12971da177e4SLinus Torvalds unsigned int length; 12981da177e4SLinus Torvalds unsigned int lun; 12991da177e4SLinus Torvalds unsigned int num_luns; 13001da177e4SLinus Torvalds unsigned int retries; 130139216033SJames Bottomley int result; 13021da177e4SLinus Torvalds struct scsi_lun *lunp, *lun_data; 13031da177e4SLinus Torvalds u8 *data; 13041da177e4SLinus Torvalds struct scsi_sense_hdr sshdr; 13056f3a2024SJames Bottomley struct scsi_device *sdev; 13066f3a2024SJames Bottomley struct Scsi_Host *shost = dev_to_shost(&starget->dev); 13072ef89198SAlan Stern int ret = 0; 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds /* 13101da177e4SLinus Torvalds * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. 13111da177e4SLinus Torvalds * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does 13121da177e4SLinus Torvalds * support more than 8 LUNs. 131309b6b51bSAlan Stern * Don't attempt if the target doesn't support REPORT LUNS. 13141da177e4SLinus Torvalds */ 13154d7db04aSJames Bottomley if (bflags & BLIST_NOREPORTLUN) 13164d7db04aSJames Bottomley return 1; 13174d7db04aSJames Bottomley if (starget->scsi_level < SCSI_2 && 13184d7db04aSJames Bottomley starget->scsi_level != SCSI_UNKNOWN) 13194d7db04aSJames Bottomley return 1; 13204d7db04aSJames Bottomley if (starget->scsi_level < SCSI_3 && 13214d7db04aSJames Bottomley (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) 13221da177e4SLinus Torvalds return 1; 13231da177e4SLinus Torvalds if (bflags & BLIST_NOLUN) 13241da177e4SLinus Torvalds return 0; 132509b6b51bSAlan Stern if (starget->no_report_luns) 132609b6b51bSAlan Stern return 1; 13271da177e4SLinus Torvalds 13286f3a2024SJames Bottomley if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { 13296f3a2024SJames Bottomley sdev = scsi_alloc_sdev(starget, 0, NULL); 13306f3a2024SJames Bottomley if (!sdev) 13316f3a2024SJames Bottomley return 0; 133275f8ee8eSAlan Stern if (scsi_device_get(sdev)) { 133375f8ee8eSAlan Stern __scsi_remove_device(sdev); 13346f3a2024SJames Bottomley return 0; 13356f3a2024SJames Bottomley } 133675f8ee8eSAlan Stern } 13376f3a2024SJames Bottomley 13381da177e4SLinus Torvalds sprintf(devname, "host %d channel %d id %d", 13396f3a2024SJames Bottomley shost->host_no, sdev->channel, sdev->id); 13401da177e4SLinus Torvalds 13411da177e4SLinus Torvalds /* 13421da177e4SLinus Torvalds * Allocate enough to hold the header (the same size as one scsi_lun) 13431da177e4SLinus Torvalds * plus the max number of luns we are requesting. 13441da177e4SLinus Torvalds * 13451da177e4SLinus Torvalds * Reallocating and trying again (with the exact amount we need) 13461da177e4SLinus Torvalds * would be nice, but then we need to somehow limit the size 13471da177e4SLinus Torvalds * allocated based on the available memory and the limits of 13481da177e4SLinus Torvalds * kmalloc - we don't want a kmalloc() failure of a huge value to 13491da177e4SLinus Torvalds * prevent us from finding any LUNs on this target. 13501da177e4SLinus Torvalds */ 13511da177e4SLinus Torvalds length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); 13521da177e4SLinus Torvalds lun_data = kmalloc(length, GFP_ATOMIC | 13531da177e4SLinus Torvalds (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); 13546f3a2024SJames Bottomley if (!lun_data) { 1355cadbd4a5SHarvey Harrison printk(ALLOC_FAILURE_MSG, __func__); 135639216033SJames Bottomley goto out; 13576f3a2024SJames Bottomley } 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds scsi_cmd[0] = REPORT_LUNS; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds /* 13621da177e4SLinus Torvalds * bytes 1 - 5: reserved, set to zero. 13631da177e4SLinus Torvalds */ 13641da177e4SLinus Torvalds memset(&scsi_cmd[1], 0, 5); 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds /* 13671da177e4SLinus Torvalds * bytes 6 - 9: length of the command. 13681da177e4SLinus Torvalds */ 13691da177e4SLinus Torvalds scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; 13701da177e4SLinus Torvalds scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; 13711da177e4SLinus Torvalds scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; 13721da177e4SLinus Torvalds scsi_cmd[9] = (unsigned char) length & 0xff; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds scsi_cmd[10] = 0; /* reserved */ 13751da177e4SLinus Torvalds scsi_cmd[11] = 0; /* control */ 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds /* 13781da177e4SLinus Torvalds * We can get a UNIT ATTENTION, for example a power on/reset, so 13791da177e4SLinus Torvalds * retry a few times (like sd.c does for TEST UNIT READY). 13801da177e4SLinus Torvalds * Experience shows some combinations of adapter/devices get at 13811da177e4SLinus Torvalds * least two power on/resets. 13821da177e4SLinus Torvalds * 13831da177e4SLinus Torvalds * Illegal requests (for devices that do not support REPORT LUNS) 13841da177e4SLinus Torvalds * should come through as a check condition, and will not generate 13851da177e4SLinus Torvalds * a retry. 13861da177e4SLinus Torvalds */ 13871da177e4SLinus Torvalds for (retries = 0; retries < 3; retries++) { 13881da177e4SLinus Torvalds SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" 13891da177e4SLinus Torvalds " REPORT LUNS to %s (try %d)\n", devname, 13901da177e4SLinus Torvalds retries)); 139139216033SJames Bottomley 139239216033SJames Bottomley result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, 1393ea73a9f2SJames Bottomley lun_data, length, &sshdr, 1394f4f4e47eSFUJITA Tomonori SCSI_TIMEOUT + 4 * HZ, 3, NULL); 139539216033SJames Bottomley 13961da177e4SLinus Torvalds SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" 139739216033SJames Bottomley " %s (try %d) result 0x%x\n", result 139839216033SJames Bottomley ? "failed" : "successful", retries, result)); 139939216033SJames Bottomley if (result == 0) 14001da177e4SLinus Torvalds break; 1401ea73a9f2SJames Bottomley else if (scsi_sense_valid(&sshdr)) { 14021da177e4SLinus Torvalds if (sshdr.sense_key != UNIT_ATTENTION) 14031da177e4SLinus Torvalds break; 14041da177e4SLinus Torvalds } 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 140739216033SJames Bottomley if (result) { 14081da177e4SLinus Torvalds /* 14091da177e4SLinus Torvalds * The device probably does not support a REPORT LUN command 14101da177e4SLinus Torvalds */ 14112ef89198SAlan Stern ret = 1; 14122ef89198SAlan Stern goto out_err; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14151da177e4SLinus Torvalds /* 14161da177e4SLinus Torvalds * Get the length from the first four bytes of lun_data. 14171da177e4SLinus Torvalds */ 14181da177e4SLinus Torvalds data = (u8 *) lun_data->scsi_lun; 14191da177e4SLinus Torvalds length = ((data[0] << 24) | (data[1] << 16) | 14201da177e4SLinus Torvalds (data[2] << 8) | (data[3] << 0)); 14211da177e4SLinus Torvalds 14221da177e4SLinus Torvalds num_luns = (length / sizeof(struct scsi_lun)); 14231da177e4SLinus Torvalds if (num_luns > max_scsi_report_luns) { 14241da177e4SLinus Torvalds printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" 14251da177e4SLinus Torvalds " of %d luns reported, try increasing" 14261da177e4SLinus Torvalds " max_scsi_report_luns.\n", devname, 14271da177e4SLinus Torvalds max_scsi_report_luns, num_luns); 14281da177e4SLinus Torvalds num_luns = max_scsi_report_luns; 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 14313bf743e7SJeff Garzik SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, 14323bf743e7SJeff Garzik "scsi scan: REPORT LUN scan\n")); 14331da177e4SLinus Torvalds 14341da177e4SLinus Torvalds /* 14351da177e4SLinus Torvalds * Scan the luns in lun_data. The entry at offset 0 is really 14361da177e4SLinus Torvalds * the header, so start at 1 and go up to and including num_luns. 14371da177e4SLinus Torvalds */ 14381da177e4SLinus Torvalds for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { 14391da177e4SLinus Torvalds lun = scsilun_to_int(lunp); 14401da177e4SLinus Torvalds 14411da177e4SLinus Torvalds /* 14421da177e4SLinus Torvalds * Check if the unused part of lunp is non-zero, and so 14431da177e4SLinus Torvalds * does not fit in lun. 14441da177e4SLinus Torvalds */ 14451da177e4SLinus Torvalds if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { 14461da177e4SLinus Torvalds int i; 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds /* 14491da177e4SLinus Torvalds * Output an error displaying the LUN in byte order, 14501da177e4SLinus Torvalds * this differs from what linux would print for the 14511da177e4SLinus Torvalds * integer LUN value. 14521da177e4SLinus Torvalds */ 14531da177e4SLinus Torvalds printk(KERN_WARNING "scsi: %s lun 0x", devname); 14541da177e4SLinus Torvalds data = (char *)lunp->scsi_lun; 14551da177e4SLinus Torvalds for (i = 0; i < sizeof(struct scsi_lun); i++) 14561da177e4SLinus Torvalds printk("%02x", data[i]); 14571da177e4SLinus Torvalds printk(" has a LUN larger than currently supported.\n"); 14581da177e4SLinus Torvalds } else if (lun > sdev->host->max_lun) { 14591da177e4SLinus Torvalds printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" 14601da177e4SLinus Torvalds " than allowed by the host adapter\n", 14611da177e4SLinus Torvalds devname, lun); 14621da177e4SLinus Torvalds } else { 14631da177e4SLinus Torvalds int res; 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds res = scsi_probe_and_add_lun(starget, 14661da177e4SLinus Torvalds lun, NULL, NULL, rescan, NULL); 14671da177e4SLinus Torvalds if (res == SCSI_SCAN_NO_RESPONSE) { 14681da177e4SLinus Torvalds /* 14691da177e4SLinus Torvalds * Got some results, but now none, abort. 14701da177e4SLinus Torvalds */ 14713bf743e7SJeff Garzik sdev_printk(KERN_ERR, sdev, 14723bf743e7SJeff Garzik "Unexpected response" 14733bf743e7SJeff Garzik " from lun %d while scanning, scan" 14743bf743e7SJeff Garzik " aborted\n", lun); 14751da177e4SLinus Torvalds break; 14761da177e4SLinus Torvalds } 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds } 14791da177e4SLinus Torvalds 14802ef89198SAlan Stern out_err: 14811da177e4SLinus Torvalds kfree(lun_data); 14821da177e4SLinus Torvalds out: 14836f3a2024SJames Bottomley scsi_device_put(sdev); 14840f1d87a2SJames Bottomley if (scsi_device_created(sdev)) 14851da177e4SLinus Torvalds /* 14866f3a2024SJames Bottomley * the sdev we used didn't appear in the report luns scan 14871da177e4SLinus Torvalds */ 1488860dc736SJames Bottomley __scsi_remove_device(sdev); 14892ef89198SAlan Stern return ret; 14901da177e4SLinus Torvalds } 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, 14931da177e4SLinus Torvalds uint id, uint lun, void *hostdata) 14941da177e4SLinus Torvalds { 1495a97a83a0SMatthew Wilcox struct scsi_device *sdev = ERR_PTR(-ENODEV); 14961da177e4SLinus Torvalds struct device *parent = &shost->shost_gendev; 1497e02f3f59SChristoph Hellwig struct scsi_target *starget; 14981da177e4SLinus Torvalds 1499938e2ac0SMatthew Wilcox if (strncmp(scsi_scan_type, "none", 4) == 0) 1500938e2ac0SMatthew Wilcox return ERR_PTR(-ENODEV); 1501938e2ac0SMatthew Wilcox 1502e02f3f59SChristoph Hellwig starget = scsi_alloc_target(parent, channel, id); 15031da177e4SLinus Torvalds if (!starget) 15041da177e4SLinus Torvalds return ERR_PTR(-ENOMEM); 1505bc4f2401SAlan Stern scsi_autopm_get_target(starget); 15061da177e4SLinus Torvalds 15070b950672SArjan van de Ven mutex_lock(&shost->scan_mutex); 15086b7f123fSMatthew Wilcox if (!shost->async_scan) 15096b7f123fSMatthew Wilcox scsi_complete_async_scans(); 15106b7f123fSMatthew Wilcox 1511bc4f2401SAlan Stern if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { 1512a97a83a0SMatthew Wilcox scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); 1513bc4f2401SAlan Stern scsi_autopm_put_host(shost); 1514bc4f2401SAlan Stern } 15150b950672SArjan van de Ven mutex_unlock(&shost->scan_mutex); 1516bc4f2401SAlan Stern scsi_autopm_put_target(starget); 15171da177e4SLinus Torvalds scsi_target_reap(starget); 15181da177e4SLinus Torvalds put_device(&starget->dev); 15191da177e4SLinus Torvalds 15201da177e4SLinus Torvalds return sdev; 15211da177e4SLinus Torvalds } 15221da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_add_device); 15231da177e4SLinus Torvalds 1524146f7262SJames Bottomley int scsi_add_device(struct Scsi_Host *host, uint channel, 1525146f7262SJames Bottomley uint target, uint lun) 1526146f7262SJames Bottomley { 1527146f7262SJames Bottomley struct scsi_device *sdev = 1528146f7262SJames Bottomley __scsi_add_device(host, channel, target, lun, NULL); 1529146f7262SJames Bottomley if (IS_ERR(sdev)) 1530146f7262SJames Bottomley return PTR_ERR(sdev); 1531146f7262SJames Bottomley 1532146f7262SJames Bottomley scsi_device_put(sdev); 1533146f7262SJames Bottomley return 0; 1534146f7262SJames Bottomley } 1535146f7262SJames Bottomley EXPORT_SYMBOL(scsi_add_device); 1536146f7262SJames Bottomley 15371da177e4SLinus Torvalds void scsi_rescan_device(struct device *dev) 15381da177e4SLinus Torvalds { 15391da177e4SLinus Torvalds struct scsi_driver *drv; 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds if (!dev->driver) 15421da177e4SLinus Torvalds return; 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds drv = to_scsi_driver(dev->driver); 15451da177e4SLinus Torvalds if (try_module_get(drv->owner)) { 15461da177e4SLinus Torvalds if (drv->rescan) 15471da177e4SLinus Torvalds drv->rescan(dev); 15481da177e4SLinus Torvalds module_put(drv->owner); 15491da177e4SLinus Torvalds } 15501da177e4SLinus Torvalds } 15511da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_rescan_device); 15521da177e4SLinus Torvalds 1553e517d313SAlan Stern static void __scsi_scan_target(struct device *parent, unsigned int channel, 15541da177e4SLinus Torvalds unsigned int id, unsigned int lun, int rescan) 15551da177e4SLinus Torvalds { 15561da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(parent); 15571da177e4SLinus Torvalds int bflags = 0; 15581da177e4SLinus Torvalds int res; 15591da177e4SLinus Torvalds struct scsi_target *starget; 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds if (shost->this_id == id) 15621da177e4SLinus Torvalds /* 15631da177e4SLinus Torvalds * Don't scan the host adapter 15641da177e4SLinus Torvalds */ 15651da177e4SLinus Torvalds return; 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds starget = scsi_alloc_target(parent, channel, id); 15681da177e4SLinus Torvalds if (!starget) 15691da177e4SLinus Torvalds return; 1570bc4f2401SAlan Stern scsi_autopm_get_target(starget); 15711da177e4SLinus Torvalds 15721da177e4SLinus Torvalds if (lun != SCAN_WILD_CARD) { 15731da177e4SLinus Torvalds /* 15741da177e4SLinus Torvalds * Scan for a specific host/chan/id/lun. 15751da177e4SLinus Torvalds */ 15761da177e4SLinus Torvalds scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); 15771da177e4SLinus Torvalds goto out_reap; 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds /* 15811da177e4SLinus Torvalds * Scan LUN 0, if there is some response, scan further. Ideally, we 15821da177e4SLinus Torvalds * would not configure LUN 0 until all LUNs are scanned. 15831da177e4SLinus Torvalds */ 15846f3a2024SJames Bottomley res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); 15856f3a2024SJames Bottomley if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { 15866f3a2024SJames Bottomley if (scsi_report_lun_scan(starget, bflags, rescan) != 0) 15871da177e4SLinus Torvalds /* 15881da177e4SLinus Torvalds * The REPORT LUN did not scan the target, 15891da177e4SLinus Torvalds * do a sequential scan. 15901da177e4SLinus Torvalds */ 15911da177e4SLinus Torvalds scsi_sequential_lun_scan(starget, bflags, 15924186ab19SKurt Garloff starget->scsi_level, rescan); 15931da177e4SLinus Torvalds } 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds out_reap: 1596bc4f2401SAlan Stern scsi_autopm_put_target(starget); 15971da177e4SLinus Torvalds /* now determine if the target has any children at all 15981da177e4SLinus Torvalds * and if not, nuke it */ 15991da177e4SLinus Torvalds scsi_target_reap(starget); 16001da177e4SLinus Torvalds 16011da177e4SLinus Torvalds put_device(&starget->dev); 16021da177e4SLinus Torvalds } 1603e517d313SAlan Stern 1604e517d313SAlan Stern /** 1605e59e4a09SRandy Dunlap * scsi_scan_target - scan a target id, possibly including all LUNs on the target. 1606e517d313SAlan Stern * @parent: host to scan 1607e517d313SAlan Stern * @channel: channel to scan 1608e517d313SAlan Stern * @id: target id to scan 1609e517d313SAlan Stern * @lun: Specific LUN to scan or SCAN_WILD_CARD 1610e517d313SAlan Stern * @rescan: passed to LUN scanning routines 1611e517d313SAlan Stern * 1612e517d313SAlan Stern * Description: 1613e517d313SAlan Stern * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, 1614e517d313SAlan Stern * and possibly all LUNs on the target id. 1615e517d313SAlan Stern * 1616e517d313SAlan Stern * First try a REPORT LUN scan, if that does not scan the target, do a 1617e517d313SAlan Stern * sequential scan of LUNs on the target id. 1618e517d313SAlan Stern **/ 1619e517d313SAlan Stern void scsi_scan_target(struct device *parent, unsigned int channel, 1620e517d313SAlan Stern unsigned int id, unsigned int lun, int rescan) 1621e517d313SAlan Stern { 1622e517d313SAlan Stern struct Scsi_Host *shost = dev_to_shost(parent); 1623e517d313SAlan Stern 162493b45af5SMatthew Wilcox if (strncmp(scsi_scan_type, "none", 4) == 0) 162593b45af5SMatthew Wilcox return; 162693b45af5SMatthew Wilcox 16276b7f123fSMatthew Wilcox mutex_lock(&shost->scan_mutex); 16283e082a91SMatthew Wilcox if (!shost->async_scan) 16293e082a91SMatthew Wilcox scsi_complete_async_scans(); 16303e082a91SMatthew Wilcox 1631bc4f2401SAlan Stern if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { 1632e517d313SAlan Stern __scsi_scan_target(parent, channel, id, lun, rescan); 1633bc4f2401SAlan Stern scsi_autopm_put_host(shost); 1634bc4f2401SAlan Stern } 16350b950672SArjan van de Ven mutex_unlock(&shost->scan_mutex); 1636e517d313SAlan Stern } 16371da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_scan_target); 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, 16401da177e4SLinus Torvalds unsigned int id, unsigned int lun, int rescan) 16411da177e4SLinus Torvalds { 16421da177e4SLinus Torvalds uint order_id; 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds if (id == SCAN_WILD_CARD) 16451da177e4SLinus Torvalds for (id = 0; id < shost->max_id; ++id) { 16461da177e4SLinus Torvalds /* 16471da177e4SLinus Torvalds * XXX adapter drivers when possible (FCP, iSCSI) 16481da177e4SLinus Torvalds * could modify max_id to match the current max, 16491da177e4SLinus Torvalds * not the absolute max. 16501da177e4SLinus Torvalds * 16511da177e4SLinus Torvalds * XXX add a shost id iterator, so for example, 16521da177e4SLinus Torvalds * the FC ID can be the same as a target id 16531da177e4SLinus Torvalds * without a huge overhead of sparse id's. 16541da177e4SLinus Torvalds */ 16551da177e4SLinus Torvalds if (shost->reverse_ordering) 16561da177e4SLinus Torvalds /* 16571da177e4SLinus Torvalds * Scan from high to low id. 16581da177e4SLinus Torvalds */ 16591da177e4SLinus Torvalds order_id = shost->max_id - id - 1; 16601da177e4SLinus Torvalds else 16611da177e4SLinus Torvalds order_id = id; 1662e517d313SAlan Stern __scsi_scan_target(&shost->shost_gendev, channel, 1663e517d313SAlan Stern order_id, lun, rescan); 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds else 1666e517d313SAlan Stern __scsi_scan_target(&shost->shost_gendev, channel, 1667e517d313SAlan Stern id, lun, rescan); 16681da177e4SLinus Torvalds } 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, 16711da177e4SLinus Torvalds unsigned int id, unsigned int lun, int rescan) 16721da177e4SLinus Torvalds { 16733bf743e7SJeff Garzik SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, 16743bf743e7SJeff Garzik "%s: <%u:%u:%u>\n", 1675cadbd4a5SHarvey Harrison __func__, channel, id, lun)); 16761da177e4SLinus Torvalds 16771da177e4SLinus Torvalds if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || 1678091686d3SAmit Arora ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || 16791da177e4SLinus Torvalds ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) 16801da177e4SLinus Torvalds return -EINVAL; 16811da177e4SLinus Torvalds 16820b950672SArjan van de Ven mutex_lock(&shost->scan_mutex); 16836b7f123fSMatthew Wilcox if (!shost->async_scan) 16846b7f123fSMatthew Wilcox scsi_complete_async_scans(); 16856b7f123fSMatthew Wilcox 1686bc4f2401SAlan Stern if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) { 16871da177e4SLinus Torvalds if (channel == SCAN_WILD_CARD) 168882f29467SMike Anderson for (channel = 0; channel <= shost->max_channel; 168982f29467SMike Anderson channel++) 169082f29467SMike Anderson scsi_scan_channel(shost, channel, id, lun, 169182f29467SMike Anderson rescan); 16921da177e4SLinus Torvalds else 16931da177e4SLinus Torvalds scsi_scan_channel(shost, channel, id, lun, rescan); 1694bc4f2401SAlan Stern scsi_autopm_put_host(shost); 169582f29467SMike Anderson } 16960b950672SArjan van de Ven mutex_unlock(&shost->scan_mutex); 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds return 0; 16991da177e4SLinus Torvalds } 17001da177e4SLinus Torvalds 17013e082a91SMatthew Wilcox static void scsi_sysfs_add_devices(struct Scsi_Host *shost) 17023e082a91SMatthew Wilcox { 17033e082a91SMatthew Wilcox struct scsi_device *sdev; 17043e082a91SMatthew Wilcox shost_for_each_device(sdev, shost) { 17053b661a92SDan Williams /* target removed before the device could be added */ 17063b661a92SDan Williams if (sdev->sdev_state == SDEV_DEL) 17073b661a92SDan Williams continue; 17086b7f123fSMatthew Wilcox if (!scsi_host_scan_allowed(shost) || 17096b7f123fSMatthew Wilcox scsi_sysfs_add_sdev(sdev) != 0) 1710860dc736SJames Bottomley __scsi_remove_device(sdev); 17113e082a91SMatthew Wilcox } 17123e082a91SMatthew Wilcox } 17133e082a91SMatthew Wilcox 17143e082a91SMatthew Wilcox /** 17153e082a91SMatthew Wilcox * scsi_prep_async_scan - prepare for an async scan 17163e082a91SMatthew Wilcox * @shost: the host which will be scanned 17173e082a91SMatthew Wilcox * Returns: a cookie to be passed to scsi_finish_async_scan() 17183e082a91SMatthew Wilcox * 17193e082a91SMatthew Wilcox * Tells the midlayer this host is going to do an asynchronous scan. 17203e082a91SMatthew Wilcox * It reserves the host's position in the scanning list and ensures 17213e082a91SMatthew Wilcox * that other asynchronous scans started after this one won't affect the 17223e082a91SMatthew Wilcox * ordering of the discovered devices. 17233e082a91SMatthew Wilcox */ 17241aa8fab2SMatthew Wilcox static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) 17253e082a91SMatthew Wilcox { 17263e082a91SMatthew Wilcox struct async_scan_data *data; 17276b7f123fSMatthew Wilcox unsigned long flags; 17283e082a91SMatthew Wilcox 17293e082a91SMatthew Wilcox if (strncmp(scsi_scan_type, "sync", 4) == 0) 17303e082a91SMatthew Wilcox return NULL; 17313e082a91SMatthew Wilcox 17323e082a91SMatthew Wilcox if (shost->async_scan) { 1733cadbd4a5SHarvey Harrison printk("%s called twice for host %d", __func__, 17343e082a91SMatthew Wilcox shost->host_no); 17353e082a91SMatthew Wilcox dump_stack(); 17363e082a91SMatthew Wilcox return NULL; 17373e082a91SMatthew Wilcox } 17383e082a91SMatthew Wilcox 17393e082a91SMatthew Wilcox data = kmalloc(sizeof(*data), GFP_KERNEL); 17403e082a91SMatthew Wilcox if (!data) 17413e082a91SMatthew Wilcox goto err; 17423e082a91SMatthew Wilcox data->shost = scsi_host_get(shost); 17433e082a91SMatthew Wilcox if (!data->shost) 17443e082a91SMatthew Wilcox goto err; 17453e082a91SMatthew Wilcox init_completion(&data->prev_finished); 17463e082a91SMatthew Wilcox 17476b7f123fSMatthew Wilcox mutex_lock(&shost->scan_mutex); 17486b7f123fSMatthew Wilcox spin_lock_irqsave(shost->host_lock, flags); 17493e082a91SMatthew Wilcox shost->async_scan = 1; 17506b7f123fSMatthew Wilcox spin_unlock_irqrestore(shost->host_lock, flags); 17516b7f123fSMatthew Wilcox mutex_unlock(&shost->scan_mutex); 17526b7f123fSMatthew Wilcox 17536b7f123fSMatthew Wilcox spin_lock(&async_scan_lock); 17543e082a91SMatthew Wilcox if (list_empty(&scanning_hosts)) 17553e082a91SMatthew Wilcox complete(&data->prev_finished); 17563e082a91SMatthew Wilcox list_add_tail(&data->list, &scanning_hosts); 17573e082a91SMatthew Wilcox spin_unlock(&async_scan_lock); 17583e082a91SMatthew Wilcox 17593e082a91SMatthew Wilcox return data; 17603e082a91SMatthew Wilcox 17613e082a91SMatthew Wilcox err: 17623e082a91SMatthew Wilcox kfree(data); 17633e082a91SMatthew Wilcox return NULL; 17643e082a91SMatthew Wilcox } 17653e082a91SMatthew Wilcox 17663e082a91SMatthew Wilcox /** 17673e082a91SMatthew Wilcox * scsi_finish_async_scan - asynchronous scan has finished 17683e082a91SMatthew Wilcox * @data: cookie returned from earlier call to scsi_prep_async_scan() 17693e082a91SMatthew Wilcox * 17703e082a91SMatthew Wilcox * All the devices currently attached to this host have been found. 17713e082a91SMatthew Wilcox * This function announces all the devices it has found to the rest 17723e082a91SMatthew Wilcox * of the system. 17733e082a91SMatthew Wilcox */ 17741aa8fab2SMatthew Wilcox static void scsi_finish_async_scan(struct async_scan_data *data) 17753e082a91SMatthew Wilcox { 17763e082a91SMatthew Wilcox struct Scsi_Host *shost; 17776b7f123fSMatthew Wilcox unsigned long flags; 17783e082a91SMatthew Wilcox 17793e082a91SMatthew Wilcox if (!data) 17803e082a91SMatthew Wilcox return; 17813e082a91SMatthew Wilcox 17823e082a91SMatthew Wilcox shost = data->shost; 17836b7f123fSMatthew Wilcox 17846b7f123fSMatthew Wilcox mutex_lock(&shost->scan_mutex); 17856b7f123fSMatthew Wilcox 17863e082a91SMatthew Wilcox if (!shost->async_scan) { 1787cadbd4a5SHarvey Harrison printk("%s called twice for host %d", __func__, 17883e082a91SMatthew Wilcox shost->host_no); 17893e082a91SMatthew Wilcox dump_stack(); 1790773e82f6SJulia Lawall mutex_unlock(&shost->scan_mutex); 17913e082a91SMatthew Wilcox return; 17923e082a91SMatthew Wilcox } 17933e082a91SMatthew Wilcox 17943e082a91SMatthew Wilcox wait_for_completion(&data->prev_finished); 17953e082a91SMatthew Wilcox 17963e082a91SMatthew Wilcox scsi_sysfs_add_devices(shost); 17973e082a91SMatthew Wilcox 17986b7f123fSMatthew Wilcox spin_lock_irqsave(shost->host_lock, flags); 17993e082a91SMatthew Wilcox shost->async_scan = 0; 18006b7f123fSMatthew Wilcox spin_unlock_irqrestore(shost->host_lock, flags); 18016b7f123fSMatthew Wilcox 18026b7f123fSMatthew Wilcox mutex_unlock(&shost->scan_mutex); 18036b7f123fSMatthew Wilcox 18046b7f123fSMatthew Wilcox spin_lock(&async_scan_lock); 18053e082a91SMatthew Wilcox list_del(&data->list); 18063e082a91SMatthew Wilcox if (!list_empty(&scanning_hosts)) { 18073e082a91SMatthew Wilcox struct async_scan_data *next = list_entry(scanning_hosts.next, 18083e082a91SMatthew Wilcox struct async_scan_data, list); 18093e082a91SMatthew Wilcox complete(&next->prev_finished); 18103e082a91SMatthew Wilcox } 18113e082a91SMatthew Wilcox spin_unlock(&async_scan_lock); 18123e082a91SMatthew Wilcox 1813267a6ad4SHuajun Li scsi_autopm_put_host(shost); 18143e082a91SMatthew Wilcox scsi_host_put(shost); 18153e082a91SMatthew Wilcox kfree(data); 18163e082a91SMatthew Wilcox } 18173e082a91SMatthew Wilcox 18181aa8fab2SMatthew Wilcox static void do_scsi_scan_host(struct Scsi_Host *shost) 18191aa8fab2SMatthew Wilcox { 18201aa8fab2SMatthew Wilcox if (shost->hostt->scan_finished) { 18211aa8fab2SMatthew Wilcox unsigned long start = jiffies; 18221aa8fab2SMatthew Wilcox if (shost->hostt->scan_start) 18231aa8fab2SMatthew Wilcox shost->hostt->scan_start(shost); 18241aa8fab2SMatthew Wilcox 18251aa8fab2SMatthew Wilcox while (!shost->hostt->scan_finished(shost, jiffies - start)) 18261aa8fab2SMatthew Wilcox msleep(10); 18271aa8fab2SMatthew Wilcox } else { 18281aa8fab2SMatthew Wilcox scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, 18291aa8fab2SMatthew Wilcox SCAN_WILD_CARD, 0); 18301aa8fab2SMatthew Wilcox } 18311aa8fab2SMatthew Wilcox } 18321aa8fab2SMatthew Wilcox 18336cdd5520SDan Williams static void do_scan_async(void *_data, async_cookie_t c) 18343e082a91SMatthew Wilcox { 18353e082a91SMatthew Wilcox struct async_scan_data *data = _data; 1836bc4f2401SAlan Stern struct Scsi_Host *shost = data->shost; 1837bc4f2401SAlan Stern 1838bc4f2401SAlan Stern do_scsi_scan_host(shost); 18393e082a91SMatthew Wilcox scsi_finish_async_scan(data); 18403e082a91SMatthew Wilcox } 18413e082a91SMatthew Wilcox 18421da177e4SLinus Torvalds /** 18431da177e4SLinus Torvalds * scsi_scan_host - scan the given adapter 18441da177e4SLinus Torvalds * @shost: adapter to scan 18451da177e4SLinus Torvalds **/ 18461da177e4SLinus Torvalds void scsi_scan_host(struct Scsi_Host *shost) 18471da177e4SLinus Torvalds { 18483e082a91SMatthew Wilcox struct async_scan_data *data; 18493e082a91SMatthew Wilcox 18503e082a91SMatthew Wilcox if (strncmp(scsi_scan_type, "none", 4) == 0) 18513e082a91SMatthew Wilcox return; 1852bc4f2401SAlan Stern if (scsi_autopm_get_host(shost) < 0) 1853bc4f2401SAlan Stern return; 18543e082a91SMatthew Wilcox 18553e082a91SMatthew Wilcox data = scsi_prep_async_scan(shost); 18563e082a91SMatthew Wilcox if (!data) { 18571aa8fab2SMatthew Wilcox do_scsi_scan_host(shost); 1858bc4f2401SAlan Stern scsi_autopm_put_host(shost); 18593e082a91SMatthew Wilcox return; 18603e082a91SMatthew Wilcox } 18611aa8fab2SMatthew Wilcox 18626cdd5520SDan Williams /* register with the async subsystem so wait_for_device_probe() 18636cdd5520SDan Williams * will flush this work 18646cdd5520SDan Williams */ 18656cdd5520SDan Williams async_schedule(do_scan_async, data); 18666cdd5520SDan Williams 1867267a6ad4SHuajun Li /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */ 18681da177e4SLinus Torvalds } 18691da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_scan_host); 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds void scsi_forget_host(struct Scsi_Host *shost) 18721da177e4SLinus Torvalds { 1873a64358dbSAlan Stern struct scsi_device *sdev; 18741da177e4SLinus Torvalds unsigned long flags; 18751da177e4SLinus Torvalds 1876a64358dbSAlan Stern restart: 18771da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 1878a64358dbSAlan Stern list_for_each_entry(sdev, &shost->__devices, siblings) { 1879a64358dbSAlan Stern if (sdev->sdev_state == SDEV_DEL) 1880a64358dbSAlan Stern continue; 18811da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 1882a64358dbSAlan Stern __scsi_remove_device(sdev); 1883a64358dbSAlan Stern goto restart; 18841da177e4SLinus Torvalds } 18851da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 18861da177e4SLinus Torvalds } 18871da177e4SLinus Torvalds 18889f6aa575SRandy Dunlap /** 18899f6aa575SRandy Dunlap * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself 18909f6aa575SRandy Dunlap * @shost: Host that needs a scsi_device 18911da177e4SLinus Torvalds * 18921da177e4SLinus Torvalds * Lock status: None assumed. 18931da177e4SLinus Torvalds * 1894f64a181dSChristoph Hellwig * Returns: The scsi_device or NULL 18951da177e4SLinus Torvalds * 18961da177e4SLinus Torvalds * Notes: 1897f64a181dSChristoph Hellwig * Attach a single scsi_device to the Scsi_Host - this should 18981da177e4SLinus Torvalds * be made to look like a "pseudo-device" that points to the 18991da177e4SLinus Torvalds * HA itself. 19001da177e4SLinus Torvalds * 19011da177e4SLinus Torvalds * Note - this device is not accessible from any high-level 19021da177e4SLinus Torvalds * drivers (including generics), which is probably not 19039f6aa575SRandy Dunlap * optimal. We can add hooks later to attach. 19041da177e4SLinus Torvalds */ 19051da177e4SLinus Torvalds struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) 19061da177e4SLinus Torvalds { 1907e517d313SAlan Stern struct scsi_device *sdev = NULL; 19081da177e4SLinus Torvalds struct scsi_target *starget; 19091da177e4SLinus Torvalds 19100b950672SArjan van de Ven mutex_lock(&shost->scan_mutex); 1911e517d313SAlan Stern if (!scsi_host_scan_allowed(shost)) 1912e517d313SAlan Stern goto out; 19131da177e4SLinus Torvalds starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); 19141da177e4SLinus Torvalds if (!starget) 1915e517d313SAlan Stern goto out; 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds sdev = scsi_alloc_sdev(starget, 0, NULL); 1918d5469119SAlan Stern if (sdev) 19191da177e4SLinus Torvalds sdev->borken = 0; 1920d5469119SAlan Stern else 1921884d25ccSJames Bottomley scsi_target_reap(starget); 19221da177e4SLinus Torvalds put_device(&starget->dev); 1923e517d313SAlan Stern out: 19240b950672SArjan van de Ven mutex_unlock(&shost->scan_mutex); 19251da177e4SLinus Torvalds return sdev; 19261da177e4SLinus Torvalds } 19271da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_get_host_dev); 19281da177e4SLinus Torvalds 19299f6aa575SRandy Dunlap /** 19309f6aa575SRandy Dunlap * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself 19319f6aa575SRandy Dunlap * @sdev: Host device to be freed 19321da177e4SLinus Torvalds * 19331da177e4SLinus Torvalds * Lock status: None assumed. 19341da177e4SLinus Torvalds * 19351da177e4SLinus Torvalds * Returns: Nothing 19361da177e4SLinus Torvalds */ 19371da177e4SLinus Torvalds void scsi_free_host_dev(struct scsi_device *sdev) 19381da177e4SLinus Torvalds { 19391da177e4SLinus Torvalds BUG_ON(sdev->id != sdev->host->this_id); 19401da177e4SLinus Torvalds 1941860dc736SJames Bottomley __scsi_remove_device(sdev); 19421da177e4SLinus Torvalds } 19431da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_free_host_dev); 19441da177e4SLinus Torvalds 1945