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USB: make urb scatter-gather support more generic 

The WHCI HCD will also support urbs with scatter-gather lists.  Add a
usb_bus field to indicated how many sg list elements are supported by
the HCD.  Use this to decide whether to pass the scatter-list to the HCD
or not.

Make the usb-storage driver use this new field.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Vrabel 2009-08-24 14:44:30 +01:00 committed by Greg Kroah-Hartman
parent 09ce497e79
commit 4c1bd3d7a7
4 changed files with 14 additions and 7 deletions
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8
drivers/usb/core/message.c
View File

@ -393,13 +393,7 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
if (io->entries <= 0)
return io->entries;
/* If we're running on an xHCI host controller, queue the whole scatter
* gather list with one call to urb_enqueue(). This is only for bulk,
* as that endpoint type does not care how the data gets broken up
* across frames.
*/
if (usb_pipebulk(pipe) &&
bus_to_hcd(dev->bus)->driver->flags & HCD_USB3) {
if (dev->bus->sg_tablesize > 0) {
io->urbs = kmalloc(sizeof *io->urbs, mem_flags);
use_sg = true;
} else {

2
drivers/usb/host/xhci-pci.c
View File

@ -54,6 +54,8 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval;
hcd->self.sg_tablesize = TRBS_PER_SEGMENT - 1;
xhci->cap_regs = hcd->regs;
xhci->op_regs = hcd->regs +
HC_LENGTH(xhci_readl(xhci, &xhci->cap_regs->hc_capbase));

10
drivers/usb/storage/usb.c
View File

@ -843,6 +843,15 @@ static int usb_stor_scan_thread(void * __us)
complete_and_exit(&us->scanning_done, 0);
}
static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
{
struct usb_device *usb_dev = interface_to_usbdev(intf);
if (usb_dev->bus->sg_tablesize) {
return usb_dev->bus->sg_tablesize;
}
return SG_ALL;
}
/* First part of general USB mass-storage probing */
int usb_stor_probe1(struct us_data **pus,
@ -871,6 +880,7 @@ int usb_stor_probe1(struct us_data **pus,
* Allow 16-byte CDBs and thus > 2TB
*/
host->max_cmd_len = 16;
host->sg_tablesize = usb_stor_sg_tablesize(intf);
*pus = us = host_to_us(host);
memset(us, 0, sizeof(struct us_data));
mutex_init(&(us->dev_mutex));

1
include/linux/usb.h
View File

@ -331,6 +331,7 @@ struct usb_bus {
u8 otg_port; /* 0, or number of OTG/HNP port */
unsigned is_b_host:1; /* true during some HNP roleswitches */
unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
unsigned sg_tablesize; /* 0 or largest number of sg list entries */
int devnum_next; /* Next open device number in
* round-robin allocation */