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/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "usb.h"
static int uas_is_interface(struct usb_host_interface *intf)
{
return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
intf->desc.bInterfaceProtocol == USB_PR_UAS);
}
static struct usb_host_interface *uas_find_uas_alt_setting(
struct usb_interface *intf)
{
int i;
for (i = 0; i < intf->num_altsetting; i++) {
struct usb_host_interface *alt = &intf->altsetting[i];
if (uas_is_interface(alt))
return alt;
}
return NULL;
}
static int uas_find_endpoints(struct usb_host_interface *alt,
struct usb_host_endpoint *eps[])
{
struct usb_host_endpoint *endpoint = alt->endpoint;
unsigned i, n_endpoints = alt->desc.bNumEndpoints;
for (i = 0; i < n_endpoints; i++) {
unsigned char *extra = endpoint[i].extra;
int len = endpoint[i].extralen;
while (len >= 3) {
if (extra[1] == USB_DT_PIPE_USAGE) {
unsigned pipe_id = extra[2];
if (pipe_id > 0 && pipe_id < 5)
eps[pipe_id - 1] = &endpoint[i];
break;
}
len -= extra[0];
extra += extra[0];
}
}
if (!eps[0] || !eps[1] || !eps[2] || !eps[3])
return -ENODEV;
return 0;
}
static int uas_use_uas_driver(struct usb_interface *intf,
const struct usb_device_id *id,
unsigned long *flags_ret)
{
struct usb_host_endpoint *eps[4] = { };
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
unsigned long flags = id->driver_info;
struct usb_host_interface *alt;
int r;
alt = uas_find_uas_alt_setting(intf);
if (!alt)
return 0;
r = uas_find_endpoints(alt, eps);
if (r < 0)
return 0;
/*
* ASMedia has a number of usb3 to sata bridge chips, at the time of
* this writing the following versions exist:
* ASM1051 - no uas support version
* ASM1051 - with broken (*) uas support
* ASM1053 - with working uas support, but problems with large xfers
* ASM1153 - with working uas support
*
* Devices with these chips re-use a number of device-ids over the
* entire line, so the device-id is useless to determine if we're
* dealing with an ASM1051 (which we want to avoid).
*
* The ASM1153 can be identified by config.MaxPower == 0,
* where as the ASM105x models have config.MaxPower == 36.
*
* Differentiating between the ASM1053 and ASM1051 is trickier, when
* connected over USB-3 we can look at the number of streams supported,
* ASM1051 supports 32 streams, where as early ASM1053 versions support
* 16 streams, newer ASM1053-s also support 32 streams, but have a
* different prod-id.
*
* (*) ASM1051 chips do work with UAS with some disks (with the
* US_FL_NO_REPORT_OPCODES quirk), but are broken with other disks
*/
if (le16_to_cpu(udev->descriptor.idVendor) == 0x174c &&
(le16_to_cpu(udev->descriptor.idProduct) == 0x5106 ||
le16_to_cpu(udev->descriptor.idProduct) == 0x55aa)) {
if (udev->actconfig->desc.bMaxPower == 0) {
/* ASM1153, do nothing */
} else if (udev->speed < USB_SPEED_SUPER) {
/* No streams info, assume ASM1051 */
flags |= US_FL_IGNORE_UAS;
} else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) {
/* Possibly an ASM1051, disable uas */
flags |= US_FL_IGNORE_UAS;
} else {
/* ASM1053, these have issues with large transfers */
flags |= US_FL_MAX_SECTORS_240;
}
}
usb_stor_adjust_quirks(udev, &flags);
if (flags & US_FL_IGNORE_UAS) {
dev_warn(&udev->dev,
"UAS is blacklisted for this device, using usb-storage instead\n");
return 0;
}
if (udev->bus->sg_tablesize == 0) {
dev_warn(&udev->dev,
"The driver for the USB controller %s does not support scatter-gather which is\n",
hcd->driver->description);
dev_warn(&udev->dev,
"required by the UAS driver. Please try an other USB controller if you wish to use UAS.\n");
return 0;
}
if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams) {
dev_warn(&udev->dev,
"USB controller %s does not support streams, which are required by the UAS driver.\n",
hcd_to_bus(hcd)->bus_name);
dev_warn(&udev->dev,
"Please try an other USB controller if you wish to use UAS.\n");
return 0;
}
if (flags_ret)
*flags_ret = flags;
return 1;
}
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