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![Lucas De Marchi](/assets/img/avatar_default.png)
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
582 lines
18 KiB
C
582 lines
18 KiB
C
/* Driver for USB Mass Storage compliant devices
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* SCSI layer glue code
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*
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* Current development and maintenance by:
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* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* Developed with the assistance of:
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* (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
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* (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
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*
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* Initial work by:
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* (c) 1999 Michael Gee (michael@linuxspecific.com)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_devinfo.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include "usb.h"
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#include "scsiglue.h"
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#include "debug.h"
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#include "transport.h"
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#include "protocol.h"
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/* Vendor IDs for companies that seem to include the READ CAPACITY bug
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* in all their devices
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*/
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#define VENDOR_ID_NOKIA 0x0421
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#define VENDOR_ID_NIKON 0x04b0
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#define VENDOR_ID_PENTAX 0x0a17
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#define VENDOR_ID_MOTOROLA 0x22b8
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/***********************************************************************
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* Host functions
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***********************************************************************/
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static const char* host_info(struct Scsi_Host *host)
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{
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struct us_data *us = host_to_us(host);
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return us->scsi_name;
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}
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static int slave_alloc (struct scsi_device *sdev)
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{
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struct us_data *us = host_to_us(sdev->host);
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/*
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* Set the INQUIRY transfer length to 36. We don't use any of
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* the extra data and many devices choke if asked for more or
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* less than 36 bytes.
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*/
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sdev->inquiry_len = 36;
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/* USB has unusual DMA-alignment requirements: Although the
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* starting address of each scatter-gather element doesn't matter,
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* the length of each element except the last must be divisible
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* by the Bulk maxpacket value. There's currently no way to
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* express this by block-layer constraints, so we'll cop out
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* and simply require addresses to be aligned at 512-byte
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* boundaries. This is okay since most block I/O involves
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* hardware sectors that are multiples of 512 bytes in length,
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* and since host controllers up through USB 2.0 have maxpacket
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* values no larger than 512.
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*
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* But it doesn't suffice for Wireless USB, where Bulk maxpacket
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* values can be as large as 2048. To make that work properly
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* will require changes to the block layer.
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*/
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blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
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/*
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* The UFI spec treates the Peripheral Qualifier bits in an
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* INQUIRY result as reserved and requires devices to set them
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* to 0. However the SCSI spec requires these bits to be set
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* to 3 to indicate when a LUN is not present.
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*
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* Let the scanning code know if this target merely sets
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* Peripheral Device Type to 0x1f to indicate no LUN.
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*/
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if (us->subclass == USB_SC_UFI)
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sdev->sdev_target->pdt_1f_for_no_lun = 1;
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return 0;
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}
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static int slave_configure(struct scsi_device *sdev)
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{
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struct us_data *us = host_to_us(sdev->host);
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/* Many devices have trouble transferring more than 32KB at a time,
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* while others have trouble with more than 64K. At this time we
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* are limiting both to 32K (64 sectores).
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*/
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if (us->fflags & (US_FL_MAX_SECTORS_64 | US_FL_MAX_SECTORS_MIN)) {
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unsigned int max_sectors = 64;
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if (us->fflags & US_FL_MAX_SECTORS_MIN)
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max_sectors = PAGE_CACHE_SIZE >> 9;
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if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
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blk_queue_max_hw_sectors(sdev->request_queue,
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max_sectors);
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} else if (sdev->type == TYPE_TAPE) {
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/* Tapes need much higher max_sector limits, so just
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* raise it to the maximum possible (4 GB / 512) and
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* let the queue segment size sort out the real limit.
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*/
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blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
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}
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/* Some USB host controllers can't do DMA; they have to use PIO.
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* They indicate this by setting their dma_mask to NULL. For
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* such controllers we need to make sure the block layer sets
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* up bounce buffers in addressable memory.
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*/
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if (!us->pusb_dev->bus->controller->dma_mask)
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blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
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/* We can't put these settings in slave_alloc() because that gets
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* called before the device type is known. Consequently these
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* settings can't be overridden via the scsi devinfo mechanism. */
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if (sdev->type == TYPE_DISK) {
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/* Some vendors seem to put the READ CAPACITY bug into
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* all their devices -- primarily makers of cell phones
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* and digital cameras. Since these devices always use
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* flash media and can be expected to have an even number
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* of sectors, we will always enable the CAPACITY_HEURISTICS
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* flag unless told otherwise. */
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switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) {
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case VENDOR_ID_NOKIA:
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case VENDOR_ID_NIKON:
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case VENDOR_ID_PENTAX:
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case VENDOR_ID_MOTOROLA:
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if (!(us->fflags & (US_FL_FIX_CAPACITY |
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US_FL_CAPACITY_OK)))
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us->fflags |= US_FL_CAPACITY_HEURISTICS;
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break;
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}
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/* Disk-type devices use MODE SENSE(6) if the protocol
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* (SubClass) is Transparent SCSI, otherwise they use
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* MODE SENSE(10). */
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if (us->subclass != USB_SC_SCSI && us->subclass != USB_SC_CYP_ATACB)
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sdev->use_10_for_ms = 1;
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/* Many disks only accept MODE SENSE transfer lengths of
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* 192 bytes (that's what Windows uses). */
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sdev->use_192_bytes_for_3f = 1;
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/* Some devices don't like MODE SENSE with page=0x3f,
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* which is the command used for checking if a device
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* is write-protected. Now that we tell the sd driver
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* to do a 192-byte transfer with this command the
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* majority of devices work fine, but a few still can't
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* handle it. The sd driver will simply assume those
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* devices are write-enabled. */
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if (us->fflags & US_FL_NO_WP_DETECT)
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sdev->skip_ms_page_3f = 1;
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/* A number of devices have problems with MODE SENSE for
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* page x08, so we will skip it. */
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sdev->skip_ms_page_8 = 1;
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/* Some disks return the total number of blocks in response
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* to READ CAPACITY rather than the highest block number.
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* If this device makes that mistake, tell the sd driver. */
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if (us->fflags & US_FL_FIX_CAPACITY)
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sdev->fix_capacity = 1;
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/* A few disks have two indistinguishable version, one of
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* which reports the correct capacity and the other does not.
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* The sd driver has to guess which is the case. */
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if (us->fflags & US_FL_CAPACITY_HEURISTICS)
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sdev->guess_capacity = 1;
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/* Some devices cannot handle READ_CAPACITY_16 */
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if (us->fflags & US_FL_NO_READ_CAPACITY_16)
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sdev->no_read_capacity_16 = 1;
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/* assume SPC3 or latter devices support sense size > 18 */
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if (sdev->scsi_level > SCSI_SPC_2)
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us->fflags |= US_FL_SANE_SENSE;
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/* Some devices report a SCSI revision level above 2 but are
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* unable to handle the REPORT LUNS command (for which
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* support is mandatory at level 3). Since we already have
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* a Get-Max-LUN request, we won't lose much by setting the
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* revision level down to 2. The only devices that would be
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* affected are those with sparse LUNs. */
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if (sdev->scsi_level > SCSI_2)
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sdev->sdev_target->scsi_level =
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sdev->scsi_level = SCSI_2;
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/* USB-IDE bridges tend to report SK = 0x04 (Non-recoverable
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* Hardware Error) when any low-level error occurs,
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* recoverable or not. Setting this flag tells the SCSI
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* midlayer to retry such commands, which frequently will
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* succeed and fix the error. The worst this can lead to
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* is an occasional series of retries that will all fail. */
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sdev->retry_hwerror = 1;
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/* USB disks should allow restart. Some drives spin down
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* automatically, requiring a START-STOP UNIT command. */
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sdev->allow_restart = 1;
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/* Some USB cardreaders have trouble reading an sdcard's last
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* sector in a larger then 1 sector read, since the performance
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* impact is negible we set this flag for all USB disks */
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sdev->last_sector_bug = 1;
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/* Enable last-sector hacks for single-target devices using
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* the Bulk-only transport, unless we already know the
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* capacity will be decremented or is correct. */
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if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK |
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US_FL_SCM_MULT_TARG)) &&
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us->protocol == USB_PR_BULK)
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us->use_last_sector_hacks = 1;
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} else {
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/* Non-disk-type devices don't need to blacklist any pages
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* or to force 192-byte transfer lengths for MODE SENSE.
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* But they do need to use MODE SENSE(10). */
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sdev->use_10_for_ms = 1;
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/* Some (fake) usb cdrom devices don't like READ_DISC_INFO */
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if (us->fflags & US_FL_NO_READ_DISC_INFO)
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sdev->no_read_disc_info = 1;
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}
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/* The CB and CBI transports have no way to pass LUN values
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* other than the bits in the second byte of a CDB. But those
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* bits don't get set to the LUN value if the device reports
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* scsi_level == 0 (UNKNOWN). Hence such devices must necessarily
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* be single-LUN.
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*/
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if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_CBI) &&
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sdev->scsi_level == SCSI_UNKNOWN)
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us->max_lun = 0;
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/* Some devices choke when they receive a PREVENT-ALLOW MEDIUM
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* REMOVAL command, so suppress those commands. */
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if (us->fflags & US_FL_NOT_LOCKABLE)
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sdev->lockable = 0;
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/* this is to satisfy the compiler, tho I don't think the
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* return code is ever checked anywhere. */
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return 0;
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}
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/* queue a command */
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/* This is always called with scsi_lock(host) held */
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static int queuecommand_lck(struct scsi_cmnd *srb,
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void (*done)(struct scsi_cmnd *))
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{
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struct us_data *us = host_to_us(srb->device->host);
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US_DEBUGP("%s called\n", __func__);
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/* check for state-transition errors */
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if (us->srb != NULL) {
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printk(KERN_ERR USB_STORAGE "Error in %s: us->srb = %p\n",
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__func__, us->srb);
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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/* fail the command if we are disconnecting */
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if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
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US_DEBUGP("Fail command during disconnect\n");
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srb->result = DID_NO_CONNECT << 16;
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done(srb);
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return 0;
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}
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/* enqueue the command and wake up the control thread */
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srb->scsi_done = done;
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us->srb = srb;
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complete(&us->cmnd_ready);
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return 0;
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}
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static DEF_SCSI_QCMD(queuecommand)
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/***********************************************************************
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* Error handling functions
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***********************************************************************/
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/* Command timeout and abort */
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static int command_abort(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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US_DEBUGP("%s called\n", __func__);
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/* us->srb together with the TIMED_OUT, RESETTING, and ABORTING
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* bits are protected by the host lock. */
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scsi_lock(us_to_host(us));
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/* Is this command still active? */
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if (us->srb != srb) {
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scsi_unlock(us_to_host(us));
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US_DEBUGP ("-- nothing to abort\n");
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return FAILED;
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}
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/* Set the TIMED_OUT bit. Also set the ABORTING bit, but only if
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* a device reset isn't already in progress (to avoid interfering
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* with the reset). Note that we must retain the host lock while
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* calling usb_stor_stop_transport(); otherwise it might interfere
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* with an auto-reset that begins as soon as we release the lock. */
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set_bit(US_FLIDX_TIMED_OUT, &us->dflags);
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if (!test_bit(US_FLIDX_RESETTING, &us->dflags)) {
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set_bit(US_FLIDX_ABORTING, &us->dflags);
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usb_stor_stop_transport(us);
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}
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scsi_unlock(us_to_host(us));
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/* Wait for the aborted command to finish */
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wait_for_completion(&us->notify);
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return SUCCESS;
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}
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/* This invokes the transport reset mechanism to reset the state of the
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* device */
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static int device_reset(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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int result;
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US_DEBUGP("%s called\n", __func__);
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/* lock the device pointers and do the reset */
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mutex_lock(&(us->dev_mutex));
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result = us->transport_reset(us);
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mutex_unlock(&us->dev_mutex);
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return result < 0 ? FAILED : SUCCESS;
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}
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/* Simulate a SCSI bus reset by resetting the device's USB port. */
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static int bus_reset(struct scsi_cmnd *srb)
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{
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struct us_data *us = host_to_us(srb->device->host);
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int result;
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US_DEBUGP("%s called\n", __func__);
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result = usb_stor_port_reset(us);
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return result < 0 ? FAILED : SUCCESS;
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}
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|
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/* Report a driver-initiated device reset to the SCSI layer.
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* Calling this for a SCSI-initiated reset is unnecessary but harmless.
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* The caller must own the SCSI host lock. */
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void usb_stor_report_device_reset(struct us_data *us)
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{
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int i;
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struct Scsi_Host *host = us_to_host(us);
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scsi_report_device_reset(host, 0, 0);
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if (us->fflags & US_FL_SCM_MULT_TARG) {
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for (i = 1; i < host->max_id; ++i)
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scsi_report_device_reset(host, 0, i);
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}
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}
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|
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/* Report a driver-initiated bus reset to the SCSI layer.
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* Calling this for a SCSI-initiated reset is unnecessary but harmless.
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* The caller must not own the SCSI host lock. */
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void usb_stor_report_bus_reset(struct us_data *us)
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{
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struct Scsi_Host *host = us_to_host(us);
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scsi_lock(host);
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scsi_report_bus_reset(host, 0);
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scsi_unlock(host);
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}
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|
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/***********************************************************************
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* /proc/scsi/ functions
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***********************************************************************/
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|
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/* we use this macro to help us write into the buffer */
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#undef SPRINTF
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#define SPRINTF(args...) \
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do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
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|
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static int proc_info (struct Scsi_Host *host, char *buffer,
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char **start, off_t offset, int length, int inout)
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|
{
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struct us_data *us = host_to_us(host);
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char *pos = buffer;
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const char *string;
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|
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/* if someone is sending us data, just throw it away */
|
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if (inout)
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return length;
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|
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/* print the controller name */
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SPRINTF(" Host scsi%d: usb-storage\n", host->host_no);
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|
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/* print product, vendor, and serial number strings */
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if (us->pusb_dev->manufacturer)
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string = us->pusb_dev->manufacturer;
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else if (us->unusual_dev->vendorName)
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string = us->unusual_dev->vendorName;
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else
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string = "Unknown";
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SPRINTF(" Vendor: %s\n", string);
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if (us->pusb_dev->product)
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string = us->pusb_dev->product;
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else if (us->unusual_dev->productName)
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string = us->unusual_dev->productName;
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else
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string = "Unknown";
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SPRINTF(" Product: %s\n", string);
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if (us->pusb_dev->serial)
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string = us->pusb_dev->serial;
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else
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string = "None";
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SPRINTF("Serial Number: %s\n", string);
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|
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/* show the protocol and transport */
|
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SPRINTF(" Protocol: %s\n", us->protocol_name);
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SPRINTF(" Transport: %s\n", us->transport_name);
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|
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/* show the device flags */
|
|
if (pos < buffer + length) {
|
|
pos += sprintf(pos, " Quirks:");
|
|
|
|
#define US_FLAG(name, value) \
|
|
if (us->fflags & 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, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct scsi_device *sdev = to_scsi_device(dev);
|
|
|
|
return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue));
|
|
}
|
|
|
|
/* Input routine for the sysfs max_sectors file */
|
|
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);
|
|
unsigned short ms;
|
|
|
|
if (sscanf(buf, "%hu", &ms) > 0) {
|
|
blk_queue_max_hw_sectors(sdev->request_queue, ms);
|
|
return count;
|
|
}
|
|
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 = SCSI_MAX_SG_CHAIN_SEGMENTS,
|
|
|
|
/* 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 */
|
|
};
|
|
EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB);
|