scsiglue.c revision 883d989a7edf7a62e38e9150990b56209420e9e5
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Driver for USB Mass Storage compliant devices 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * SCSI layer glue code 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * $Id: scsiglue.c,v 1.26 2002/04/22 03:39:43 mdharm Exp $ 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Current development and maintenance by: 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Developed with the assistance of: 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Initial work by: 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (c) 1999 Michael Gee (michael@linuxspecific.com) 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This driver is based on the 'USB Mass Storage Class' document. This 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * describes in detail the protocol used to communicate with such 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * devices. Clearly, the designers had SCSI and ATAPI commands in 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * mind when they created this document. The commands are all very 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * similar to commands in the SCSI-II and ATAPI specifications. 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * It is important to note that in a number of cases this class 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * exhibits class-specific exemptions from the USB specification. 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Notably the usage of NAK, STALL and ACK differs from the norm, in 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * that they are used to communicate wait, failed and OK on commands. 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Also, for certain devices, the interrupt endpoint is used to convey 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * status of a command. 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * information about this driver. 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify it 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * under the terms of the GNU General Public License as published by the 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Free Software Foundation; either version 2, or (at your option) any 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * later version. 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is distributed in the hope that it will be useful, but 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * WITHOUT ANY WARRANTY; without even the implied warranty of 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * General Public License for more details. 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * You should have received a copy of the GNU General Public License along 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * with this program; if not, write to the Free Software Foundation, Inc., 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 675 Mass Ave, Cambridge, MA 02139, USA. 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 504186ecf8ad16dd05759a09594de6a87e48759ba6Arjan van de Ven#include <linux/mutex.h> 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi.h> 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_cmnd.h> 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_devinfo.h> 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_device.h> 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <scsi/scsi_eh.h> 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "usb.h" 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "scsiglue.h" 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "debug.h" 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "transport.h" 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include "protocol.h" 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*********************************************************************** 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Host functions 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ***********************************************************************/ 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic const char* host_info(struct Scsi_Host *host) 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return "SCSI emulation for USB Mass Storage devices"; 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slave_alloc (struct scsi_device *sdev) 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Set the INQUIRY transfer length to 36. We don't use any of 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the extra data and many devices choke if asked for more or 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * less than 36 bytes. 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->inquiry_len = 36; 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int slave_configure(struct scsi_device *sdev) 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(sdev->host); 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Scatter-gather buffers (all but the last) must have a length 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * divisible by the bulk maxpacket size. Otherwise a data packet 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * would end up being short, causing a premature end to the data 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * transfer. Since high-speed bulk pipes have a maxpacket size 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * of 512, we'll use that as the scsi device queue's DMA alignment 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * mask. Guaranteeing proper alignment of the first buffer will 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * have the desired effect because, except at the beginning and 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the end, scatter-gather buffers follow page boundaries. */ 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds blk_queue_dma_alignment(sdev->request_queue, (512 - 1)); 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Set the SCSI level to at least 2. We'll leave it at 3 if that's 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * what is originally reported. We need this to avoid confusing 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the SCSI layer with devices that report 0 or 1, but need 10-byte 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * commands (ala ATAPI devices behind certain bridges, or devices 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * which simply have broken INQUIRY data). 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: This means /dev/sg programs (ala cdrecord) will get the 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * actual information. This seems to be the preference for 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * programs like that. 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: This also means that /proc/scsi/scsi and sysfs may report 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * the actual value or the modified one, depending on where the 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * data comes from. 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sdev->scsi_level < SCSI_2) 11328120be5d6830cd7c7777d8bf570bdb20abef58aPaul Walmsley sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2; 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 115883d989a7edf7a62e38e9150990b56209420e9e5Phil Dibowitz /* Many devices have trouble transfering more than 32KB at a time, 116883d989a7edf7a62e38e9150990b56209420e9e5Phil Dibowitz * while others have trouble with more than 64K. At this time we 117883d989a7edf7a62e38e9150990b56209420e9e5Phil Dibowitz * are limiting both to 32K (64 sectores). 118883d989a7edf7a62e38e9150990b56209420e9e5Phil Dibowitz */ 119883d989a7edf7a62e38e9150990b56209420e9e5Phil Dibowitz if ((us->flags & US_FL_MAX_SECTORS_64) && 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->request_queue->max_sectors > 64) 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds blk_queue_max_sectors(sdev->request_queue, 64); 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* We can't put these settings in slave_alloc() because that gets 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * called before the device type is known. Consequently these 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * settings can't be overridden via the scsi devinfo mechanism. */ 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sdev->type == TYPE_DISK) { 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Disk-type devices use MODE SENSE(6) if the protocol 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * (SubClass) is Transparent SCSI, otherwise they use 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * MODE SENSE(10). */ 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->subclass != US_SC_SCSI) 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->use_10_for_ms = 1; 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Many disks only accept MODE SENSE transfer lengths of 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 192 bytes (that's what Windows uses). */ 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->use_192_bytes_for_3f = 1; 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Some devices don't like MODE SENSE with page=0x3f, 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * which is the command used for checking if a device 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * is write-protected. Now that we tell the sd driver 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to do a 192-byte transfer with this command the 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * majority of devices work fine, but a few still can't 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * handle it. The sd driver will simply assume those 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * devices are write-enabled. */ 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->flags & US_FL_NO_WP_DETECT) 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->skip_ms_page_3f = 1; 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* A number of devices have problems with MODE SENSE for 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * page x08, so we will skip it. */ 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->skip_ms_page_8 = 1; 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Some disks return the total number of blocks in response 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * to READ CAPACITY rather than the highest block number. 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * If this device makes that mistake, tell the sd driver. */ 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->flags & US_FL_FIX_CAPACITY) 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->fix_capacity = 1; 15786dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm 158a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm /* Some devices report a SCSI revision level above 2 but are 159a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm * unable to handle the REPORT LUNS command (for which 160a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm * support is mandatory at level 3). Since we already have 161a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm * a Get-Max-LUN request, we won't lose much by setting the 162a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm * revision level down to 2. The only devices that would be 163a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm * affected are those with sparse LUNs. */ 16428120be5d6830cd7c7777d8bf570bdb20abef58aPaul Walmsley sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2; 165a4e628328ec60873fec9d506d682155391f589ceMatthew Dharm 16686dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable 16786dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm * Hardware Error) when any low-level error occurs, 16886dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm * recoverable or not. Setting this flag tells the SCSI 16986dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm * midlayer to retry such commands, which frequently will 17086dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm * succeed and fix the error. The worst this can lead to 17186dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm * is an occasional series of retries that will all fail. */ 17286dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm sdev->retry_hwerror = 1; 17386dbde9cbdfe8bc2c2dfe5d33027d3acc55e0470Matthew Dharm 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Non-disk-type devices don't need to blacklist any pages 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * or to force 192-byte transfer lengths for MODE SENSE. 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * But they do need to use MODE SENSE(10). */ 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->use_10_for_ms = 1; 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Some devices choke when they receive a PREVENT-ALLOW MEDIUM 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * REMOVAL command, so suppress those commands. */ 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->flags & US_FL_NOT_LOCKABLE) 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sdev->lockable = 0; 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* this is to satisfy the compiler, tho I don't think the 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * return code is ever checked anywhere. */ 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* queue a command */ 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* This is always called with scsi_lock(host) held */ 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int queuecommand(struct scsi_cmnd *srb, 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void (*done)(struct scsi_cmnd *)) 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(srb->device->host); 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP("%s called\n", __FUNCTION__); 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* check for state-transition errors */ 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->srb != NULL) { 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n", 2041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds __FUNCTION__, us->srb); 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return SCSI_MLQUEUE_HOST_BUSY; 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* fail the command if we are disconnecting */ 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) { 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP("Fail command during disconnect\n"); 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds srb->result = DID_NO_CONNECT << 16; 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds done(srb); 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* enqueue the command and wake up the control thread */ 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds srb->scsi_done = done; 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds us->srb = srb; 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds up(&(us->sema)); 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*********************************************************************** 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Error handling functions 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ***********************************************************************/ 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Command timeout and abort */ 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int command_abort(struct scsi_cmnd *srb) 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(srb->device->host); 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP("%s called\n", __FUNCTION__); 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 235226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING 236226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm * bits are protected by the host lock. */ 237226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm scsi_lock(us_to_host(us)); 238226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Is this command still active? */ 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->srb != srb) { 241226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm scsi_unlock(us_to_host(us)); 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP ("-- nothing to abort\n"); 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return FAILED; 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * a device reset isn't already in progress (to avoid interfering 248226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm * with the reset). Note that we must retain the host lock while 249226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm * calling usb_stor_stop_transport(); otherwise it might interfere 250226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm * with an auto-reset that begins as soon as we release the lock. */ 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_bit(US_FLIDX_TIMED_OUT, &us->flags); 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!test_bit(US_FLIDX_RESETTING, &us->flags)) { 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds set_bit(US_FLIDX_ABORTING, &us->flags); 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds usb_stor_stop_transport(us); 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 256226173edae1c49c68ebb723771a02302c85e3475Matthew Dharm scsi_unlock(us_to_host(us)); 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Wait for the aborted command to finish */ 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wait_for_completion(&us->notify); 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return SUCCESS; 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* This invokes the transport reset mechanism to reset the state of the 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * device */ 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int device_reset(struct scsi_cmnd *srb) 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(srb->device->host); 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int result; 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP("%s called\n", __FUNCTION__); 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* lock the device pointers and do the reset */ 2734186ecf8ad16dd05759a09594de6a87e48759ba6Arjan van de Ven mutex_lock(&(us->dev_mutex)); 2744d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm result = us->transport_reset(us); 2754186ecf8ad16dd05759a09594de6a87e48759ba6Arjan van de Ven mutex_unlock(&us->dev_mutex); 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2774d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm return result < 0 ? FAILED : SUCCESS; 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2804d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm/* Simulate a SCSI bus reset by resetting the device's USB port. */ 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int bus_reset(struct scsi_cmnd *srb) 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(srb->device->host); 2844d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm int result; 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds US_DEBUGP("%s called\n", __FUNCTION__); 2874d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm result = usb_stor_port_reset(us); 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return result < 0 ? FAILED : SUCCESS; 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Report a driver-initiated device reset to the SCSI layer. 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Calling this for a SCSI-initiated reset is unnecessary but harmless. 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The caller must own the SCSI host lock. */ 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid usb_stor_report_device_reset(struct us_data *us) 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct Scsi_Host *host = us_to_host(us); 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_report_device_reset(host, 0, 0); 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->flags & US_FL_SCM_MULT_TARG) { 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 1; i < host->max_id; ++i) 3021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds scsi_report_device_reset(host, 0, i); 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3064d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm/* Report a driver-initiated bus reset to the SCSI layer. 3074d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm * Calling this for a SCSI-initiated reset is unnecessary but harmless. 3084d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm * The caller must own the SCSI host lock. */ 3094d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharmvoid usb_stor_report_bus_reset(struct us_data *us) 3104d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm{ 3114d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm scsi_report_bus_reset(us_to_host(us), 0); 3124d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm} 3134d07ef762fc8d6d35ecc1511a3b953a733a61a5fMatthew Dharm 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*********************************************************************** 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * /proc/scsi/ functions 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ***********************************************************************/ 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* we use this macro to help us write into the buffer */ 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef SPRINTF 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define SPRINTF(args...) \ 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0) 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int proc_info (struct Scsi_Host *host, char *buffer, 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char **start, off_t offset, int length, int inout) 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct us_data *us = host_to_us(host); 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *pos = buffer; 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds const char *string; 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* if someone is sending us data, just throw it away */ 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (inout) 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return length; 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* print the controller name */ 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF(" Host scsi%d: usb-storage\n", host->host_no); 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* print product, vendor, and serial number strings */ 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->pusb_dev->manufacturer) 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = us->pusb_dev->manufacturer; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (us->unusual_dev->vendorName) 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = us->unusual_dev->vendorName; 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = "Unknown"; 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF(" Vendor: %s\n", string); 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->pusb_dev->product) 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = us->pusb_dev->product; 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if (us->unusual_dev->productName) 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = us->unusual_dev->productName; 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = "Unknown"; 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF(" Product: %s\n", string); 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->pusb_dev->serial) 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = us->pusb_dev->serial; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds string = "None"; 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF("Serial Number: %s\n", string); 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* show the protocol and transport */ 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF(" Protocol: %s\n", us->protocol_name); 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds SPRINTF(" Transport: %s\n", us->transport_name); 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* show the device flags */ 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (pos < buffer + length) { 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds pos += sprintf(pos, " Quirks:"); 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define US_FLAG(name, value) \ 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (us->flags & value) pos += sprintf(pos, " " #name); 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsUS_DO_ALL_FLAGS 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#undef US_FLAG 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *(pos++) = '\n'; 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Calculate start of next buffer, and return value. 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *start = buffer + offset; 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if ((pos - buffer) < offset) 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (0); 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else if ((pos - buffer - offset) < length) 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (pos - buffer - offset); 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds else 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (length); 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*********************************************************************** 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Sysfs interface 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ***********************************************************************/ 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Output routine for the sysfs max_sectors file */ 392060b8845e6bea938d65ad6f89e83507e5ff4fec4Yani Ioannoustatic ssize_t show_max_sectors(struct device *dev, struct device_attribute *attr, char *buf) 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct scsi_device *sdev = to_scsi_device(dev); 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return sprintf(buf, "%u\n", sdev->request_queue->max_sectors); 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Input routine for the sysfs max_sectors file */ 400060b8845e6bea938d65ad6f89e83507e5ff4fec4Yani Ioannoustatic ssize_t store_max_sectors(struct device *dev, struct device_attribute *attr, const char *buf, 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t count) 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct scsi_device *sdev = to_scsi_device(dev); 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned short ms; 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) { 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds blk_queue_max_sectors(sdev->request_queue, ms); 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return strlen(buf); 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors, 4141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds store_max_sectors); 4151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct device_attribute *sysfs_device_attr_list[] = { 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds &dev_attr_max_sectors, 4181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds NULL, 4191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds }; 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * this defines our host template, with which we'll allocate hosts 4231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct scsi_host_template usb_stor_host_template = { 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* basic userland interface stuff */ 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "usb-storage", 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .proc_name = "usb-storage", 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .proc_info = proc_info, 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .info = host_info, 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* command interface -- queued only */ 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .queuecommand = queuecommand, 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* error and abort handlers */ 4361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .eh_abort_handler = command_abort, 4371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .eh_device_reset_handler = device_reset, 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .eh_bus_reset_handler = bus_reset, 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* queue commands only, only one command per LUN */ 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .can_queue = 1, 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .cmd_per_lun = 1, 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* unknown initiator id */ 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .this_id = -1, 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .slave_alloc = slave_alloc, 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .slave_configure = slave_configure, 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* lots of sg segments can be handled */ 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .sg_tablesize = SG_ALL, 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* limit the total size of a transfer to 120 KB */ 4541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .max_sectors = 240, 4551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* merge commands... this seems to help performance, but 4571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * periodically someone should test to see which setting is more 4581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * optimal. 4591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 4601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .use_clustering = 1, 4611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* emulated HBA */ 4631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .emulated = 1, 4641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* we do our own delay after a device or bus reset */ 4661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .skip_settle_delay = 1, 4671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* sysfs device attributes */ 4691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .sdev_attrs = sysfs_device_attr_list, 4701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* module management */ 4721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .module = THIS_MODULE 4731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 4741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* To Report "Illegal Request: Invalid Field in CDB */ 4761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsunsigned char usb_stor_sense_invalidCDB[18] = { 4771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds [0] = 0x70, /* current error */ 4781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds [2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */ 4791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds [7] = 0x0a, /* additional length */ 4801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds [12] = 0x24 /* Invalid Field in CDB */ 4811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 4821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 483