#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/mutex.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 <scsi/scsi_host.h>
-#include "scsiglue.h"
#include "usb.h"
+#include "scsiglue.h"
#include "debug.h"
#include "transport.h"
#include "protocol.h"
static int slave_alloc (struct scsi_device *sdev)
{
+ struct us_data *us = host_to_us(sdev->host);
+
/*
- * Set default bflags. These can be overridden for individual
- * models and vendors via the scsi devinfo mechanism. The only
- * flag we need is to force 36-byte INQUIRYs; we don't use any
- * of the extra data and many devices choke if asked for more or
+ * 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->sdev_bflags = BLIST_INQUIRY_36;
+ sdev->inquiry_len = 36;
+
+ /*
+ * The UFI spec treates the Peripheral Qualifier bits in an
+ * INQUIRY result as reserved and requires devices to set them
+ * to 0. However the SCSI spec requires these bits to be set
+ * to 3 to indicate when a LUN is not present.
+ *
+ * Let the scanning code know if this target merely sets
+ * Peripheral Device Type to 0x1f to indicate no LUN.
+ */
+ if (us->subclass == US_SC_UFI)
+ sdev->sdev_target->pdt_1f_for_no_lun = 1;
return 0;
}
static int slave_configure(struct scsi_device *sdev)
{
- struct us_data *us = (struct us_data *) sdev->host->hostdata[0];
+ 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
* the end, scatter-gather buffers follow page boundaries. */
blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
- /* 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 (us->pusb_dev->descriptor.idVendor == USB_VENDOR_ID_GENESYS &&
+ /* 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 = sdev->sdev_target->scsi_level = SCSI_2;
+
+ /* Many devices have trouble transfering more than 32KB at a time,
+ * while others have trouble with more than 64K. At this time we
+ * are limiting both to 32K (64 sectores).
+ */
+ if ((us->flags & US_FL_MAX_SECTORS_64) &&
sdev->request_queue->max_sectors > 64)
blk_queue_max_sectors(sdev->request_queue, 64);
* 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;
-#ifndef CONFIG_USB_STORAGE_RW_DETECT
- /* Some devices may not like MODE SENSE with page=0x3f.
- * Now that we're using 192-byte transfers this may no
- * longer be a problem. So this will be a configuration
- * option. */
- sdev->skip_ms_page_3f = 1;
-#endif
+ /* 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;
+
+ /* Some devices report a SCSI revision level above 2 but are
+ * unable to handle the REPORT LUNS command (for which
+ * support is mandatory at level 3). Since we already have
+ * a Get-Max-LUN request, we won't lose much by setting the
+ * revision level down to 2. The only devices that would be
+ * affected are those with sparse LUNs. */
+ sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;
+
+ /* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable
+ * Hardware Error) when any low-level error occurs,
+ * recoverable or not. Setting this flag tells the SCSI
+ * midlayer to retry such commands, which frequently will
+ * succeed and fix the error. The worst this can lead to
+ * is an occasional series of retries that will all fail. */
+ sdev->retry_hwerror = 1;
} else {
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(srb->host) held */
+/* 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 = (struct us_data *)srb->device->host->hostdata[0];
+ struct us_data *us = host_to_us(srb->device->host);
US_DEBUGP("%s called\n", __FUNCTION__);
- srb->host_scribble = (unsigned char *)us;
- /* enqueue the command */
- if (us->sm_state != US_STATE_IDLE || us->srb != NULL) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "state = %d, us->srb = %p\n",
- __FUNCTION__, us->sm_state, us->srb);
+ /* 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;
-
- /* wake up the process task */
up(&(us->sema));
return 0;
* Error handling functions
***********************************************************************/
-/* Command abort */
-/* This is always called with scsi_lock(srb->host) held */
-static int command_abort(struct scsi_cmnd *srb )
+/* Command timeout and abort */
+static int command_abort(struct scsi_cmnd *srb)
{
- struct Scsi_Host *host = srb->device->host;
- struct us_data *us = (struct us_data *) host->hostdata[0];
+ struct us_data *us = host_to_us(srb->device->host);
US_DEBUGP("%s called\n", __FUNCTION__);
+ /* us->srb together with the TIMED_OUT, RESETTING, and ABORTING
+ * bits are protected by the host lock. */
+ scsi_lock(us_to_host(us));
+
/* Is this command still active? */
if (us->srb != srb) {
+ scsi_unlock(us_to_host(us));
US_DEBUGP ("-- nothing to abort\n");
return FAILED;
}
- /* Normally the current state is RUNNING. If the control thread
- * hasn't even started processing this command, the state will be
- * IDLE. Anything else is a bug. */
- if (us->sm_state != US_STATE_RUNNING
- && us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
-
- /* Set state to ABORTING and set the ABORTING bit, but only if
+ /* 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. */
- us->sm_state = US_STATE_ABORTING;
+ * with the reset). Note that we must retain the host lock while
+ * calling usb_stor_stop_transport(); otherwise it might interfere
+ * with an auto-reset that begins as soon as we release the 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(host);
+ 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(host);
- clear_bit(US_FLIDX_ABORTING, &us->flags);
return SUCCESS;
}
/* This invokes the transport reset mechanism to reset the state of the
* device */
-/* This is always called with scsi_lock(srb->host) held */
static int device_reset(struct scsi_cmnd *srb)
{
- struct us_data *us = (struct us_data *)srb->device->host->hostdata[0];
+ struct us_data *us = host_to_us(srb->device->host);
int result;
US_DEBUGP("%s called\n", __FUNCTION__);
- if (us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
-
- /* set the state and release the lock */
- us->sm_state = US_STATE_RESETTING;
- scsi_unlock(srb->device->host);
/* 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 access to the state and clear it */
- scsi_lock(srb->device->host);
- us->sm_state = US_STATE_IDLE;
- return result;
+ mutex_lock(&(us->dev_mutex));
+ result = us->transport_reset(us);
+ mutex_unlock(&us->dev_mutex);
+
+ return result < 0 ? FAILED : SUCCESS;
}
-/* 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(srb->host) held */
+/* Simulate a SCSI bus reset by resetting the device's USB port. */
static int bus_reset(struct scsi_cmnd *srb)
{
- struct us_data *us = (struct us_data *)srb->device->host->hostdata[0];
+ struct us_data *us = host_to_us(srb->device->host);
int result;
US_DEBUGP("%s called\n", __FUNCTION__);
- if (us->sm_state != US_STATE_IDLE) {
- printk(KERN_ERR USB_STORAGE "Error in %s: "
- "invalid state %d\n", __FUNCTION__, us->sm_state);
- return FAILED;
- }
-
- /* set the state and release the lock */
- us->sm_state = US_STATE_RESETTING;
- scsi_unlock(srb->device->host);
-
- /* 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 {
- result = usb_reset_device(us->pusb_dev);
- US_DEBUGP("usb_reset_device returns %d\n", result);
- }
- up(&(us->dev_semaphore));
-
- /* lock access to the state and clear it */
- scsi_lock(srb->device->host);
- us->sm_state = US_STATE_IDLE;
+ result = usb_stor_port_reset(us);
return result < 0 ? FAILED : SUCCESS;
}
void usb_stor_report_device_reset(struct us_data *us)
{
int i;
+ struct Scsi_Host *host = us_to_host(us);
- scsi_report_device_reset(us->host, 0, 0);
+ scsi_report_device_reset(host, 0, 0);
if (us->flags & US_FL_SCM_MULT_TARG) {
- for (i = 1; i < us->host->max_id; ++i)
- scsi_report_device_reset(us->host, 0, i);
+ for (i = 1; i < host->max_id; ++i)
+ scsi_report_device_reset(host, 0, i);
}
}
+/* Report a driver-initiated bus 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_bus_reset(struct us_data *us)
+{
+ scsi_report_bus_reset(us_to_host(us), 0);
+}
+
/***********************************************************************
* /proc/scsi/ functions
***********************************************************************/
#undef SPRINTF
#define SPRINTF(args...) \
do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
-#define DO_FLAG(a) \
- do { if (us->flags & US_FL_##a) pos += sprintf(pos, " " #a); } while(0)
-static int proc_info (struct Scsi_Host *hostptr, char *buffer, char **start, off_t offset,
- int length, int inout)
+static int proc_info (struct Scsi_Host *host, char *buffer,
+ char **start, off_t offset, int length, int inout)
{
- struct us_data *us;
+ 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;
- us = (struct us_data*)hostptr->hostdata[0];
-
/* print the controller name */
- SPRINTF(" Host scsi%d: usb-storage\n", hostptr->host_no);
+ SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
/* print product, vendor, and serial number strings */
- SPRINTF(" Vendor: %s\n", us->vendor);
- SPRINTF(" Product: %s\n", us->product);
- SPRINTF("Serial Number: %s\n", us->serial);
+ 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);
if (pos < buffer + length) {
pos += sprintf(pos, " Quirks:");
- DO_FLAG(SINGLE_LUN);
- DO_FLAG(SCM_MULT_TARG);
- DO_FLAG(FIX_INQUIRY);
- DO_FLAG(FIX_CAPACITY);
+#define US_FLAG(name, value) \
+ if (us->flags & value) pos += sprintf(pos, " " #name);
+US_DO_ALL_FLAGS
+#undef US_FLAG
*(pos++) = '\n';
}
***********************************************************************/
/* Output routine for the sysfs max_sectors file */
-static ssize_t show_max_sectors(struct device *dev, char *buf)
+static ssize_t show_max_sectors(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
}
/* Input routine for the sysfs max_sectors file */
-static ssize_t store_max_sectors(struct device *dev, const char *buf,
+static ssize_t store_max_sectors(struct device *dev, struct device_attribute *attr, const char *buf,
size_t count)
{
struct scsi_device *sdev = to_scsi_device(dev);
.module = THIS_MODULE
};
-/* For a device that is "Not Ready" */
-unsigned char usb_stor_sense_notready[18] = {
- [0] = 0x70, /* current error */
- [2] = 0x02, /* not ready */
- [7] = 0x0a, /* additional length */
- [12] = 0x04, /* not ready */
- [13] = 0x03 /* manual intervention */
-};
-
/* To Report "Illegal Request: Invalid Field in CDB */
unsigned char usb_stor_sense_invalidCDB[18] = {
[0] = 0x70, /* current error */
git://git.onelab.eu / linux-2.6.git / blobdiff