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679 lines
20 KiB
679 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* 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 ([email protected]) |
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* |
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* Developed with the assistance of: |
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* (c) 2000 David L. Brown, Jr. ([email protected]) |
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* (c) 2000 Stephen J. Gowdy ([email protected]) |
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* |
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* Initial work by: |
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* (c) 1999 Michael Gee ([email protected]) |
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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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|
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#include <linux/blkdev.h> |
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#include <linux/dma-mapping.h> |
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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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|
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#include "usb.h" |
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#include <linux/usb/hcd.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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/* |
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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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/*********************************************************************** |
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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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/* |
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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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|
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/* |
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* Some host controllers may have alignment requirements. |
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* We'll play it safe by requiring 512-byte alignment always. |
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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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/* Tell the SCSI layer if we know there is more than one LUN */ |
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if (us->protocol == USB_PR_BULK && us->max_lun > 0) |
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sdev->sdev_bflags |= BLIST_FORCELUN; |
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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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struct device *dev = us->pusb_dev->bus->sysdev; |
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|
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/* |
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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_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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/* |
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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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} else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { |
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/* |
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* USB3 devices will be limited to 2048 sectors. This gives us |
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* better throughput on most devices. |
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*/ |
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blk_queue_max_hw_sectors(sdev->request_queue, 2048); |
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} |
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/* |
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* The max_hw_sectors should be up to maximum size of a mapping for |
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* the device. Otherwise, a DMA API might fail on swiotlb environment. |
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*/ |
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blk_queue_max_hw_sectors(sdev->request_queue, |
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min_t(size_t, queue_max_hw_sectors(sdev->request_queue), |
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dma_max_mapping_size(dev) >> SECTOR_SHIFT)); |
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|
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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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* For 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 (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || |
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(bus_to_hcd(us->pusb_dev->bus)->localmem_pool != NULL)) |
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blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH); |
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|
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/* |
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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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*/ |
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if (sdev->type == TYPE_DISK) { |
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/* |
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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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*/ |
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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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/* |
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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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*/ |
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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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/* |
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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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*/ |
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sdev->use_192_bytes_for_3f = 1; |
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/* |
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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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*/ |
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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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/* |
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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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*/ |
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sdev->skip_ms_page_8 = 1; |
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/* |
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* Some devices don't handle VPD pages correctly, so skip vpd |
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* pages if not forced by SCSI layer. |
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*/ |
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sdev->skip_vpd_pages = !sdev->try_vpd_pages; |
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/* Do not attempt to use REPORT SUPPORTED OPERATION CODES */ |
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sdev->no_report_opcodes = 1; |
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/* Do not attempt to use WRITE SAME */ |
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sdev->no_write_same = 1; |
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/* |
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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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*/ |
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if (us->fflags & US_FL_FIX_CAPACITY) |
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sdev->fix_capacity = 1; |
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/* |
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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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*/ |
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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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/* |
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* Many devices do not respond properly to READ_CAPACITY_16. |
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* Tell the SCSI layer to try READ_CAPACITY_10 first. |
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* However some USB 3.0 drive enclosures return capacity |
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* modulo 2TB. Those must use READ_CAPACITY_16 |
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*/ |
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if (!(us->fflags & US_FL_NEEDS_CAP16)) |
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sdev->try_rc_10_first = 1; |
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/* |
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* assume SPC3 or latter devices support sense size > 18 |
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* unless US_FL_BAD_SENSE quirk is specified. |
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*/ |
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if (sdev->scsi_level > SCSI_SPC_2 && |
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!(us->fflags & US_FL_BAD_SENSE)) |
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us->fflags |= US_FL_SANE_SENSE; |
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/* |
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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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*/ |
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sdev->retry_hwerror = 1; |
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/* |
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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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*/ |
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sdev->allow_restart = 1; |
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/* |
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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 negligible we set this flag for all USB disks |
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*/ |
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sdev->last_sector_bug = 1; |
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/* |
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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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*/ |
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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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/* Check if write cache default on flag is set or not */ |
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if (us->fflags & US_FL_WRITE_CACHE) |
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sdev->wce_default_on = 1; |
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/* A few buggy USB-ATA bridges don't understand FUA */ |
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if (us->fflags & US_FL_BROKEN_FUA) |
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sdev->broken_fua = 1; |
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/* Some even totally fail to indicate a cache */ |
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if (us->fflags & US_FL_ALWAYS_SYNC) { |
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/* don't read caching information */ |
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sdev->skip_ms_page_8 = 1; |
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sdev->skip_ms_page_3f = 1; |
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/* assume sync is needed */ |
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sdev->wce_default_on = 1; |
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} |
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} else { |
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/* |
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* Non-disk-type devices don't need to ignore 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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*/ |
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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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/* |
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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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/* |
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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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*/ |
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if (us->fflags & US_FL_NOT_LOCKABLE) |
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sdev->lockable = 0; |
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|
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/* |
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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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*/ |
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return 0; |
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} |
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static int target_alloc(struct scsi_target *starget) |
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{ |
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struct us_data *us = host_to_us(dev_to_shost(starget->dev.parent)); |
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/* |
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* Some USB drives don't support REPORT LUNS, even though they |
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* report a SCSI revision level above 2. Tell the SCSI layer |
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* not to issue that command; it will perform a normal sequential |
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* scan instead. |
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*/ |
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starget->no_report_luns = 1; |
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|
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/* |
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* The UFI spec treats 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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starget->pdt_1f_for_no_lun = 1; |
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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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|
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/* check for state-transition errors */ |
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if (us->srb != NULL) { |
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dev_err(&us->pusb_intf->dev, |
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"Error in %s: us->srb = %p\n", __func__, us->srb); |
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return SCSI_MLQUEUE_HOST_BUSY; |
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} |
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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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usb_stor_dbg(us, "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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if ((us->fflags & US_FL_NO_ATA_1X) && |
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(srb->cmnd[0] == ATA_12 || srb->cmnd[0] == ATA_16)) { |
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memcpy(srb->sense_buffer, usb_stor_sense_invalidCDB, |
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sizeof(usb_stor_sense_invalidCDB)); |
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srb->result = SAM_STAT_CHECK_CONDITION; |
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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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/*********************************************************************** |
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* Error handling functions |
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***********************************************************************/ |
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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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usb_stor_dbg(us, "%s called\n", __func__); |
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/* |
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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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*/ |
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scsi_lock(us_to_host(us)); |
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|
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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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usb_stor_dbg(us, "-- nothing to abort\n"); |
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return FAILED; |
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} |
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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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*/ |
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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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|
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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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/* |
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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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*/ |
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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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usb_stor_dbg(us, "%s called\n", __func__); |
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|
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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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usb_stor_dbg(us, "%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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/* |
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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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*/ |
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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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|
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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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/* |
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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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*/ |
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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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* /proc/scsi/ functions |
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***********************************************************************/ |
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static int write_info(struct Scsi_Host *host, char *buffer, int length) |
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{ |
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/* if someone is sending us data, just throw it away */ |
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return length; |
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} |
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|
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static int show_info (struct seq_file *m, struct Scsi_Host *host) |
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{ |
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struct us_data *us = host_to_us(host); |
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const char *string; |
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|
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/* print the controller name */ |
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seq_printf(m, " 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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seq_printf(m, " 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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seq_printf(m, " 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"; |
|
seq_printf(m, "Serial Number: %s\n", string); |
|
|
|
/* show the protocol and transport */ |
|
seq_printf(m, " Protocol: %s\n", us->protocol_name); |
|
seq_printf(m, " Transport: %s\n", us->transport_name); |
|
|
|
/* show the device flags */ |
|
seq_printf(m, " Quirks:"); |
|
|
|
#define US_FLAG(name, value) \ |
|
if (us->fflags & value) seq_printf(m, " " #name); |
|
US_DO_ALL_FLAGS |
|
#undef US_FLAG |
|
seq_putc(m, '\n'); |
|
return 0; |
|
} |
|
|
|
/*********************************************************************** |
|
* Sysfs interface |
|
***********************************************************************/ |
|
|
|
/* Output routine for the sysfs max_sectors file */ |
|
static ssize_t max_sectors_show(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 max_sectors_store(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_RW(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 |
|
*/ |
|
|
|
static const struct scsi_host_template usb_stor_host_template = { |
|
/* basic userland interface stuff */ |
|
.name = "usb-storage", |
|
.proc_name = "usb-storage", |
|
.show_info = show_info, |
|
.write_info = write_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, |
|
|
|
/* unknown initiator id */ |
|
.this_id = -1, |
|
|
|
.slave_alloc = slave_alloc, |
|
.slave_configure = slave_configure, |
|
.target_alloc = target_alloc, |
|
|
|
/* lots of sg segments can be handled */ |
|
.sg_tablesize = SG_MAX_SEGMENTS, |
|
|
|
|
|
/* |
|
* Limit the total size of a transfer to 120 KB. |
|
* |
|
* Some devices are known to choke with anything larger. It seems like |
|
* the problem stems from the fact that original IDE controllers had |
|
* only an 8-bit register to hold the number of sectors in one transfer |
|
* and even those couldn't handle a full 256 sectors. |
|
* |
|
* Because we want to make sure we interoperate with as many devices as |
|
* possible, we will maintain a 240 sector transfer size limit for USB |
|
* Mass Storage devices. |
|
* |
|
* Tests show that other operating have similar limits with Microsoft |
|
* Windows 7 limiting transfers to 128 sectors for both USB2 and USB3 |
|
* and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2 |
|
* and 2048 for USB3 devices. |
|
*/ |
|
.max_sectors = 240, |
|
|
|
/* 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 |
|
}; |
|
|
|
void usb_stor_host_template_init(struct scsi_host_template *sht, |
|
const char *name, struct module *owner) |
|
{ |
|
*sht = usb_stor_host_template; |
|
sht->name = name; |
|
sht->proc_name = name; |
|
sht->module = owner; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_stor_host_template_init); |
|
|
|
/* 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);
|
|
|