* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include "transport.h"
#include "protocol.h"
+/* Vendor IDs for companies that seem to include the READ CAPACITY bug
+ * in all their devices
+ */
+#define VENDOR_ID_NOKIA 0x0421
+#define VENDOR_ID_NIKON 0x04b0
+#define VENDOR_ID_PENTAX 0x0a17
+#define VENDOR_ID_MOTOROLA 0x22b8
+
/***********************************************************************
* Host functions
***********************************************************************/
static const char* host_info(struct Scsi_Host *host)
{
- return "SCSI emulation for USB Mass Storage devices";
+ struct us_data *us = host_to_us(host);
+ return us->scsi_name;
}
static int slave_alloc (struct scsi_device *sdev)
{
struct us_data *us = host_to_us(sdev->host);
- struct usb_host_endpoint *bulk_in_ep;
/*
* Set the INQUIRY transfer length to 36. We don't use any of
*/
sdev->inquiry_len = 36;
- /* Scatter-gather buffers (all but the last) must have a length
- * divisible by the bulk maxpacket size. Otherwise a data packet
- * would end up being short, causing a premature end to the data
- * transfer. We'll use the maxpacket value of the bulk-IN pipe
- * to set the SCSI device queue's DMA alignment mask.
+ /* USB has unusual DMA-alignment requirements: Although the
+ * starting address of each scatter-gather element doesn't matter,
+ * the length of each element except the last must be divisible
+ * by the Bulk maxpacket value. There's currently no way to
+ * express this by block-layer constraints, so we'll cop out
+ * and simply require addresses to be aligned at 512-byte
+ * boundaries. This is okay since most block I/O involves
+ * hardware sectors that are multiples of 512 bytes in length,
+ * and since host controllers up through USB 2.0 have maxpacket
+ * values no larger than 512.
+ *
+ * But it doesn't suffice for Wireless USB, where Bulk maxpacket
+ * values can be as large as 2048. To make that work properly
+ * will require changes to the block layer.
*/
- bulk_in_ep = us->pusb_dev->ep_in[usb_pipeendpoint(us->recv_bulk_pipe)];
- blk_queue_update_dma_alignment(sdev->request_queue,
- le16_to_cpu(bulk_in_ep->desc.wMaxPacketSize) - 1);
- /* wMaxPacketSize must be a power of 2 */
+ blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
/*
* The UFI spec treates the Peripheral Qualifier bits in an
if (us->fflags & US_FL_MAX_SECTORS_MIN)
max_sectors = PAGE_CACHE_SIZE >> 9;
- if (sdev->request_queue->max_sectors > max_sectors)
- blk_queue_max_sectors(sdev->request_queue,
+ if (queue_max_hw_sectors(sdev->request_queue) > max_sectors)
+ blk_queue_max_hw_sectors(sdev->request_queue,
max_sectors);
+ } else if (sdev->type == TYPE_TAPE) {
+ /* Tapes need much higher max_sector limits, so just
+ * raise it to the maximum possible (4 GB / 512) and
+ * let the queue segment size sort out the real limit.
+ */
+ blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
}
+ /* Some USB host controllers can't do DMA; they have to use PIO.
+ * They indicate this by setting their dma_mask to NULL. For
+ * such controllers we need to make sure the block layer sets
+ * up bounce buffers in addressable memory.
+ */
+ if (!us->pusb_dev->bus->controller->dma_mask)
+ blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
+
/* We can't put these settings in slave_alloc() because that gets
* called before the device type is known. Consequently these
* settings can't be overridden via the scsi devinfo mechanism. */
if (sdev->type == TYPE_DISK) {
+ /* Some vendors seem to put the READ CAPACITY bug into
+ * all their devices -- primarily makers of cell phones
+ * and digital cameras. Since these devices always use
+ * flash media and can be expected to have an even number
+ * of sectors, we will always enable the CAPACITY_HEURISTICS
+ * flag unless told otherwise. */
+ switch (le16_to_cpu(us->pusb_dev->descriptor.idVendor)) {
+ case VENDOR_ID_NOKIA:
+ case VENDOR_ID_NIKON:
+ case VENDOR_ID_PENTAX:
+ case VENDOR_ID_MOTOROLA:
+ if (!(us->fflags & (US_FL_FIX_CAPACITY |
+ US_FL_CAPACITY_OK)))
+ us->fflags |= US_FL_CAPACITY_HEURISTICS;
+ break;
+ }
+
/* Disk-type devices use MODE SENSE(6) if the protocol
* (SubClass) is Transparent SCSI, otherwise they use
* MODE SENSE(10). */
if (us->fflags & US_FL_CAPACITY_HEURISTICS)
sdev->guess_capacity = 1;
+ /* assume SPC3 or latter devices support sense size > 18 */
+ if (sdev->scsi_level > SCSI_SPC_2)
+ us->fflags |= US_FL_SANE_SENSE;
+
/* 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
* sector in a larger then 1 sector read, since the performance
* impact is negible we set this flag for all USB disks */
sdev->last_sector_bug = 1;
+
+ /* Enable last-sector hacks for single-target devices using
+ * the Bulk-only transport, unless we already know the
+ * capacity will be decremented or is correct. */
+ if (!(us->fflags & (US_FL_FIX_CAPACITY | US_FL_CAPACITY_OK |
+ US_FL_SCM_MULT_TARG)) &&
+ us->protocol == US_PR_BULK)
+ us->use_last_sector_hacks = 1;
} else {
/* Non-disk-type devices don't need to blacklist any pages
{
struct scsi_device *sdev = to_scsi_device(dev);
- return sprintf(buf, "%u\n", sdev->request_queue->max_sectors);
+ return sprintf(buf, "%u\n", queue_max_hw_sectors(sdev->request_queue));
}
/* Input routine for the sysfs max_sectors file */
struct scsi_device *sdev = to_scsi_device(dev);
unsigned short ms;
- if (sscanf(buf, "%hu", &ms) > 0 && ms <= SCSI_DEFAULT_MAX_SECTORS) {
- blk_queue_max_sectors(sdev->request_queue, ms);
- return strlen(buf);
+ if (sscanf(buf, "%hu", &ms) > 0) {
+ blk_queue_max_hw_sectors(sdev->request_queue, ms);
+ return count;
}
return -EINVAL;
}
.slave_configure = slave_configure,
/* lots of sg segments can be handled */
- .sg_tablesize = SG_ALL,
+ .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
/* limit the total size of a transfer to 120 KB */
.max_sectors = 240,
[7] = 0x0a, /* additional length */
[12] = 0x24 /* Invalid Field in CDB */
};
-
+EXPORT_SYMBOL_GPL(usb_stor_sense_invalidCDB);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff