forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
501 lines
15 KiB
C
501 lines
15 KiB
C
/* Driver for USB Mass Storage compliant devices
|
|
* SCSI layer glue code
|
|
*
|
|
* $Id: scsiglue.c,v 1.26 2002/04/22 03:39:43 mdharm Exp $
|
|
*
|
|
* Current development and maintenance by:
|
|
* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
|
|
*
|
|
* Developed with the assistance of:
|
|
* (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
|
|
* (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
|
|
*
|
|
* Initial work by:
|
|
* (c) 1999 Michael Gee (michael@linuxspecific.com)
|
|
*
|
|
* This driver is based on the 'USB Mass Storage Class' document. This
|
|
* describes in detail the protocol used to communicate with such
|
|
* devices. Clearly, the designers had SCSI and ATAPI commands in
|
|
* mind when they created this document. The commands are all very
|
|
* similar to commands in the SCSI-II and ATAPI specifications.
|
|
*
|
|
* It is important to note that in a number of cases this class
|
|
* exhibits class-specific exemptions from the USB specification.
|
|
* Notably the usage of NAK, STALL and ACK differs from the norm, in
|
|
* that they are used to communicate wait, failed and OK on commands.
|
|
*
|
|
* Also, for certain devices, the interrupt endpoint is used to convey
|
|
* status of a command.
|
|
*
|
|
* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
|
|
* information about this driver.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2, or (at your option) any
|
|
* later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_devinfo.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_eh.h>
|
|
|
|
#include "usb.h"
|
|
#include "scsiglue.h"
|
|
#include "debug.h"
|
|
#include "transport.h"
|
|
#include "protocol.h"
|
|
|
|
/***********************************************************************
|
|
* Host functions
|
|
***********************************************************************/
|
|
|
|
static const char* host_info(struct Scsi_Host *host)
|
|
{
|
|
return "SCSI emulation for USB Mass Storage devices";
|
|
}
|
|
|
|
static int slave_alloc (struct scsi_device *sdev)
|
|
{
|
|
/*
|
|
* Set the INQUIRY transfer length to 36. We don't use any of
|
|
* the extra data and many devices choke if asked for more or
|
|
* less than 36 bytes.
|
|
*/
|
|
sdev->inquiry_len = 36;
|
|
return 0;
|
|
}
|
|
|
|
static int slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct us_data *us = host_to_us(sdev->host);
|
|
|
|
/* Scatter-gather buffers (all but the last) must have a length
|
|
* divisible by the bulk maxpacket size. Otherwise a data packet
|
|
* would end up being short, causing a premature end to the data
|
|
* transfer. Since high-speed bulk pipes have a maxpacket size
|
|
* of 512, we'll use that as the scsi device queue's DMA alignment
|
|
* mask. Guaranteeing proper alignment of the first buffer will
|
|
* have the desired effect because, except at the beginning and
|
|
* the end, scatter-gather buffers follow page boundaries. */
|
|
blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
|
|
|
|
/* Set the SCSI level to at least 2. We'll leave it at 3 if that's
|
|
* what is originally reported. We need this to avoid confusing
|
|
* the SCSI layer with devices that report 0 or 1, but need 10-byte
|
|
* commands (ala ATAPI devices behind certain bridges, or devices
|
|
* which simply have broken INQUIRY data).
|
|
*
|
|
* NOTE: This means /dev/sg programs (ala cdrecord) will get the
|
|
* actual information. This seems to be the preference for
|
|
* programs like that.
|
|
*
|
|
* NOTE: This also means that /proc/scsi/scsi and sysfs may report
|
|
* the actual value or the modified one, depending on where the
|
|
* data comes from.
|
|
*/
|
|
if (sdev->scsi_level < SCSI_2)
|
|
sdev->scsi_level = SCSI_2;
|
|
|
|
/* According to the technical support people at Genesys Logic,
|
|
* devices using their chips have problems transferring more than
|
|
* 32 KB at a time. In practice people have found that 64 KB
|
|
* works okay and that's what Windows does. But we'll be
|
|
* conservative; people can always use the sysfs interface to
|
|
* increase max_sectors. */
|
|
if (le16_to_cpu(us->pusb_dev->descriptor.idVendor) == USB_VENDOR_ID_GENESYS &&
|
|
sdev->request_queue->max_sectors > 64)
|
|
blk_queue_max_sectors(sdev->request_queue, 64);
|
|
|
|
/* We can't put these settings in slave_alloc() because that gets
|
|
* called before the device type is known. Consequently these
|
|
* settings can't be overridden via the scsi devinfo mechanism. */
|
|
if (sdev->type == TYPE_DISK) {
|
|
|
|
/* Disk-type devices use MODE SENSE(6) if the protocol
|
|
* (SubClass) is Transparent SCSI, otherwise they use
|
|
* MODE SENSE(10). */
|
|
if (us->subclass != US_SC_SCSI)
|
|
sdev->use_10_for_ms = 1;
|
|
|
|
/* Many disks only accept MODE SENSE transfer lengths of
|
|
* 192 bytes (that's what Windows uses). */
|
|
sdev->use_192_bytes_for_3f = 1;
|
|
|
|
/* Some devices don't like MODE SENSE with page=0x3f,
|
|
* which is the command used for checking if a device
|
|
* is write-protected. Now that we tell the sd driver
|
|
* to do a 192-byte transfer with this command the
|
|
* majority of devices work fine, but a few still can't
|
|
* handle it. The sd driver will simply assume those
|
|
* devices are write-enabled. */
|
|
if (us->flags & US_FL_NO_WP_DETECT)
|
|
sdev->skip_ms_page_3f = 1;
|
|
|
|
/* A number of devices have problems with MODE SENSE for
|
|
* page x08, so we will skip it. */
|
|
sdev->skip_ms_page_8 = 1;
|
|
|
|
/* Some disks return the total number of blocks in response
|
|
* to READ CAPACITY rather than the highest block number.
|
|
* If this device makes that mistake, tell the sd driver. */
|
|
if (us->flags & US_FL_FIX_CAPACITY)
|
|
sdev->fix_capacity = 1;
|
|
} else {
|
|
|
|
/* Non-disk-type devices don't need to blacklist any pages
|
|
* or to force 192-byte transfer lengths for MODE SENSE.
|
|
* But they do need to use MODE SENSE(10). */
|
|
sdev->use_10_for_ms = 1;
|
|
}
|
|
|
|
/* Some devices choke when they receive a PREVENT-ALLOW MEDIUM
|
|
* REMOVAL command, so suppress those commands. */
|
|
if (us->flags & US_FL_NOT_LOCKABLE)
|
|
sdev->lockable = 0;
|
|
|
|
/* this is to satisfy the compiler, tho I don't think the
|
|
* return code is ever checked anywhere. */
|
|
return 0;
|
|
}
|
|
|
|
/* queue a command */
|
|
/* This is always called with scsi_lock(host) held */
|
|
static int queuecommand(struct scsi_cmnd *srb,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct us_data *us = host_to_us(srb->device->host);
|
|
|
|
US_DEBUGP("%s called\n", __FUNCTION__);
|
|
|
|
/* check for state-transition errors */
|
|
if (us->srb != NULL) {
|
|
printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
|
|
__FUNCTION__, us->srb);
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
/* fail the command if we are disconnecting */
|
|
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
|
|
US_DEBUGP("Fail command during disconnect\n");
|
|
srb->result = DID_NO_CONNECT << 16;
|
|
done(srb);
|
|
return 0;
|
|
}
|
|
|
|
/* enqueue the command and wake up the control thread */
|
|
srb->scsi_done = done;
|
|
us->srb = srb;
|
|
up(&(us->sema));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Error handling functions
|
|
***********************************************************************/
|
|
|
|
/* Command timeout and abort */
|
|
/* This is always called with scsi_lock(host) held */
|
|
static int command_abort(struct scsi_cmnd *srb)
|
|
{
|
|
struct us_data *us = host_to_us(srb->device->host);
|
|
|
|
US_DEBUGP("%s called\n", __FUNCTION__);
|
|
|
|
/* Is this command still active? */
|
|
if (us->srb != srb) {
|
|
US_DEBUGP ("-- nothing to abort\n");
|
|
return FAILED;
|
|
}
|
|
|
|
/* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
|
|
* a device reset isn't already in progress (to avoid interfering
|
|
* with the reset). To prevent races with auto-reset, we must
|
|
* stop any ongoing USB transfers while still holding the host
|
|
* lock. */
|
|
set_bit(US_FLIDX_TIMED_OUT, &us->flags);
|
|
if (!test_bit(US_FLIDX_RESETTING, &us->flags)) {
|
|
set_bit(US_FLIDX_ABORTING, &us->flags);
|
|
usb_stor_stop_transport(us);
|
|
}
|
|
scsi_unlock(us_to_host(us));
|
|
|
|
/* Wait for the aborted command to finish */
|
|
wait_for_completion(&us->notify);
|
|
|
|
/* Reacquire the lock and allow USB transfers to resume */
|
|
scsi_lock(us_to_host(us));
|
|
clear_bit(US_FLIDX_ABORTING, &us->flags);
|
|
clear_bit(US_FLIDX_TIMED_OUT, &us->flags);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/* This invokes the transport reset mechanism to reset the state of the
|
|
* device */
|
|
/* This is always called with scsi_lock(host) held */
|
|
static int device_reset(struct scsi_cmnd *srb)
|
|
{
|
|
struct us_data *us = host_to_us(srb->device->host);
|
|
int result;
|
|
|
|
US_DEBUGP("%s called\n", __FUNCTION__);
|
|
|
|
scsi_unlock(us_to_host(us));
|
|
|
|
/* lock the device pointers and do the reset */
|
|
down(&(us->dev_semaphore));
|
|
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
|
|
result = FAILED;
|
|
US_DEBUGP("No reset during disconnect\n");
|
|
} else
|
|
result = us->transport_reset(us);
|
|
up(&(us->dev_semaphore));
|
|
|
|
/* lock the host for the return */
|
|
scsi_lock(us_to_host(us));
|
|
return result;
|
|
}
|
|
|
|
/* This resets the device's USB port. */
|
|
/* It refuses to work if there's more than one interface in
|
|
* the device, so that other users are not affected. */
|
|
/* This is always called with scsi_lock(host) held */
|
|
static int bus_reset(struct scsi_cmnd *srb)
|
|
{
|
|
struct us_data *us = host_to_us(srb->device->host);
|
|
int result, rc;
|
|
|
|
US_DEBUGP("%s called\n", __FUNCTION__);
|
|
|
|
scsi_unlock(us_to_host(us));
|
|
|
|
/* The USB subsystem doesn't handle synchronisation between
|
|
* a device's several drivers. Therefore we reset only devices
|
|
* with just one interface, which we of course own. */
|
|
|
|
down(&(us->dev_semaphore));
|
|
if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
|
|
result = -EIO;
|
|
US_DEBUGP("No reset during disconnect\n");
|
|
} else if (us->pusb_dev->actconfig->desc.bNumInterfaces != 1) {
|
|
result = -EBUSY;
|
|
US_DEBUGP("Refusing to reset a multi-interface device\n");
|
|
} else {
|
|
rc = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
|
|
if (rc < 0) {
|
|
US_DEBUGP("unable to lock device for reset: %d\n", rc);
|
|
result = rc;
|
|
} else {
|
|
result = usb_reset_device(us->pusb_dev);
|
|
if (rc)
|
|
usb_unlock_device(us->pusb_dev);
|
|
US_DEBUGP("usb_reset_device returns %d\n", result);
|
|
}
|
|
}
|
|
up(&(us->dev_semaphore));
|
|
|
|
/* lock the host for the return */
|
|
scsi_lock(us_to_host(us));
|
|
return result < 0 ? FAILED : SUCCESS;
|
|
}
|
|
|
|
/* Report a driver-initiated device reset to the SCSI layer.
|
|
* Calling this for a SCSI-initiated reset is unnecessary but harmless.
|
|
* The caller must own the SCSI host lock. */
|
|
void usb_stor_report_device_reset(struct us_data *us)
|
|
{
|
|
int i;
|
|
struct Scsi_Host *host = us_to_host(us);
|
|
|
|
scsi_report_device_reset(host, 0, 0);
|
|
if (us->flags & US_FL_SCM_MULT_TARG) {
|
|
for (i = 1; i < host->max_id; ++i)
|
|
scsi_report_device_reset(host, 0, i);
|
|
}
|
|
}
|
|
|
|
/***********************************************************************
|
|
* /proc/scsi/ functions
|
|
***********************************************************************/
|
|
|
|
/* we use this macro to help us write into the buffer */
|
|
#undef SPRINTF
|
|
#define SPRINTF(args...) \
|
|
do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
|
|
|
|
static int proc_info (struct Scsi_Host *host, char *buffer,
|
|
char **start, off_t offset, int length, int inout)
|
|
{
|
|
struct us_data *us = host_to_us(host);
|
|
char *pos = buffer;
|
|
const char *string;
|
|
|
|
/* if someone is sending us data, just throw it away */
|
|
if (inout)
|
|
return length;
|
|
|
|
/* print the controller name */
|
|
SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
|
|
|
|
/* print product, vendor, and serial number strings */
|
|
if (us->pusb_dev->manufacturer)
|
|
string = us->pusb_dev->manufacturer;
|
|
else if (us->unusual_dev->vendorName)
|
|
string = us->unusual_dev->vendorName;
|
|
else
|
|
string = "Unknown";
|
|
SPRINTF(" Vendor: %s\n", string);
|
|
if (us->pusb_dev->product)
|
|
string = us->pusb_dev->product;
|
|
else if (us->unusual_dev->productName)
|
|
string = us->unusual_dev->productName;
|
|
else
|
|
string = "Unknown";
|
|
SPRINTF(" Product: %s\n", string);
|
|
if (us->pusb_dev->serial)
|
|
string = us->pusb_dev->serial;
|
|
else
|
|
string = "None";
|
|
SPRINTF("Serial Number: %s\n", string);
|
|
|
|
/* show the protocol and transport */
|
|
SPRINTF(" Protocol: %s\n", us->protocol_name);
|
|
SPRINTF(" Transport: %s\n", us->transport_name);
|
|
|
|
/* show the device flags */
|
|
if (pos < buffer + length) {
|
|
pos += sprintf(pos, " Quirks:");
|
|
|
|
#define US_FLAG(name, value) \
|
|
if (us->flags & value) pos += sprintf(pos, " " #name);
|
|
US_DO_ALL_FLAGS
|
|
#undef US_FLAG
|
|
|
|
*(pos++) = '\n';
|
|
}
|
|
|
|
/*
|
|
* Calculate start of next buffer, and return value.
|
|
*/
|
|
*start = buffer + offset;
|
|
|
|
if ((pos - buffer) < offset)
|
|
return (0);
|
|
else if ((pos - buffer - offset) < length)
|
|
return (pos - buffer - offset);
|
|
else
|
|
return (length);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* Sysfs interface
|
|
***********************************************************************/
|
|
|
|
/* Output routine for the sysfs max_sectors file */
|
|
static ssize_t show_max_sectors(struct device *dev, char *buf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
|
|
return sprintf(buf, "%u\n", sdev->request_queue->max_sectors);
|
|
}
|
|
|
|
/* Input routine for the sysfs max_sectors file */
|
|
static ssize_t store_max_sectors(struct device *dev, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
unsigned short ms;
|
|
|
|
if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) {
|
|
blk_queue_max_sectors(sdev->request_queue, ms);
|
|
return strlen(buf);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static DEVICE_ATTR(max_sectors, S_IRUGO | S_IWUSR, show_max_sectors,
|
|
store_max_sectors);
|
|
|
|
static struct device_attribute *sysfs_device_attr_list[] = {
|
|
&dev_attr_max_sectors,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* this defines our host template, with which we'll allocate hosts
|
|
*/
|
|
|
|
struct scsi_host_template usb_stor_host_template = {
|
|
/* basic userland interface stuff */
|
|
.name = "usb-storage",
|
|
.proc_name = "usb-storage",
|
|
.proc_info = proc_info,
|
|
.info = host_info,
|
|
|
|
/* command interface -- queued only */
|
|
.queuecommand = queuecommand,
|
|
|
|
/* error and abort handlers */
|
|
.eh_abort_handler = command_abort,
|
|
.eh_device_reset_handler = device_reset,
|
|
.eh_bus_reset_handler = bus_reset,
|
|
|
|
/* queue commands only, only one command per LUN */
|
|
.can_queue = 1,
|
|
.cmd_per_lun = 1,
|
|
|
|
/* unknown initiator id */
|
|
.this_id = -1,
|
|
|
|
.slave_alloc = slave_alloc,
|
|
.slave_configure = slave_configure,
|
|
|
|
/* lots of sg segments can be handled */
|
|
.sg_tablesize = SG_ALL,
|
|
|
|
/* limit the total size of a transfer to 120 KB */
|
|
.max_sectors = 240,
|
|
|
|
/* merge commands... this seems to help performance, but
|
|
* periodically someone should test to see which setting is more
|
|
* optimal.
|
|
*/
|
|
.use_clustering = 1,
|
|
|
|
/* emulated HBA */
|
|
.emulated = 1,
|
|
|
|
/* we do our own delay after a device or bus reset */
|
|
.skip_settle_delay = 1,
|
|
|
|
/* sysfs device attributes */
|
|
.sdev_attrs = sysfs_device_attr_list,
|
|
|
|
/* module management */
|
|
.module = THIS_MODULE
|
|
};
|
|
|
|
/* To Report "Illegal Request: Invalid Field in CDB */
|
|
unsigned char usb_stor_sense_invalidCDB[18] = {
|
|
[0] = 0x70, /* current error */
|
|
[2] = ILLEGAL_REQUEST, /* Illegal Request = 0x05 */
|
|
[7] = 0x0a, /* additional length */
|
|
[12] = 0x24 /* Invalid Field in CDB */
|
|
};
|
|
|