1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/usb.h> 3 #include <linux/usb/hcd.h> 4 #include "usb.h" 5 6 static int uas_is_interface(struct usb_host_interface *intf) 7 { 8 return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE && 9 intf->desc.bInterfaceSubClass == USB_SC_SCSI && 10 intf->desc.bInterfaceProtocol == USB_PR_UAS); 11 } 12 13 static struct usb_host_interface *uas_find_uas_alt_setting( 14 struct usb_interface *intf) 15 { 16 int i; 17 18 for (i = 0; i < intf->num_altsetting; i++) { 19 struct usb_host_interface *alt = &intf->altsetting[i]; 20 21 if (uas_is_interface(alt)) 22 return alt; 23 } 24 25 return NULL; 26 } 27 28 static int uas_find_endpoints(struct usb_host_interface *alt, 29 struct usb_host_endpoint *eps[]) 30 { 31 struct usb_host_endpoint *endpoint = alt->endpoint; 32 unsigned i, n_endpoints = alt->desc.bNumEndpoints; 33 34 for (i = 0; i < n_endpoints; i++) { 35 unsigned char *extra = endpoint[i].extra; 36 int len = endpoint[i].extralen; 37 while (len >= 3) { 38 if (extra[1] == USB_DT_PIPE_USAGE) { 39 unsigned pipe_id = extra[2]; 40 if (pipe_id > 0 && pipe_id < 5) 41 eps[pipe_id - 1] = &endpoint[i]; 42 break; 43 } 44 len -= extra[0]; 45 extra += extra[0]; 46 } 47 } 48 49 if (!eps[0] || !eps[1] || !eps[2] || !eps[3]) 50 return -ENODEV; 51 52 return 0; 53 } 54 55 static int uas_use_uas_driver(struct usb_interface *intf, 56 const struct usb_device_id *id, 57 unsigned long *flags_ret) 58 { 59 struct usb_host_endpoint *eps[4] = { }; 60 struct usb_device *udev = interface_to_usbdev(intf); 61 struct usb_hcd *hcd = bus_to_hcd(udev->bus); 62 unsigned long flags = id->driver_info; 63 struct usb_host_interface *alt; 64 int r; 65 66 alt = uas_find_uas_alt_setting(intf); 67 if (!alt) 68 return 0; 69 70 r = uas_find_endpoints(alt, eps); 71 if (r < 0) 72 return 0; 73 74 /* 75 * ASMedia has a number of usb3 to sata bridge chips, at the time of 76 * this writing the following versions exist: 77 * ASM1051 - no uas support version 78 * ASM1051 - with broken (*) uas support 79 * ASM1053 - with working uas support, but problems with large xfers 80 * ASM1153 - with working uas support 81 * 82 * Devices with these chips re-use a number of device-ids over the 83 * entire line, so the device-id is useless to determine if we're 84 * dealing with an ASM1051 (which we want to avoid). 85 * 86 * The ASM1153 can be identified by config.MaxPower == 0, 87 * where as the ASM105x models have config.MaxPower == 36. 88 * 89 * Differentiating between the ASM1053 and ASM1051 is trickier, when 90 * connected over USB-3 we can look at the number of streams supported, 91 * ASM1051 supports 32 streams, where as early ASM1053 versions support 92 * 16 streams, newer ASM1053-s also support 32 streams, but have a 93 * different prod-id. 94 * 95 * (*) ASM1051 chips do work with UAS with some disks (with the 96 * US_FL_NO_REPORT_OPCODES quirk), but are broken with other disks 97 */ 98 if (le16_to_cpu(udev->descriptor.idVendor) == 0x174c && 99 (le16_to_cpu(udev->descriptor.idProduct) == 0x5106 || 100 le16_to_cpu(udev->descriptor.idProduct) == 0x55aa)) { 101 if (udev->actconfig->desc.bMaxPower == 0) { 102 /* ASM1153, do nothing */ 103 } else if (udev->speed < USB_SPEED_SUPER) { 104 /* No streams info, assume ASM1051 */ 105 flags |= US_FL_IGNORE_UAS; 106 } else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) { 107 /* Possibly an ASM1051, disable uas */ 108 flags |= US_FL_IGNORE_UAS; 109 } else { 110 /* ASM1053, these have issues with large transfers */ 111 flags |= US_FL_MAX_SECTORS_240; 112 } 113 } 114 115 /* All Seagate disk enclosures have broken ATA pass-through support */ 116 if (le16_to_cpu(udev->descriptor.idVendor) == 0x0bc2) 117 flags |= US_FL_NO_ATA_1X; 118 119 usb_stor_adjust_quirks(udev, &flags); 120 121 if (flags & US_FL_IGNORE_UAS) { 122 dev_warn(&udev->dev, 123 "UAS is ignored for this device, using usb-storage instead\n"); 124 return 0; 125 } 126 127 if (udev->bus->sg_tablesize == 0) { 128 dev_warn(&udev->dev, 129 "The driver for the USB controller %s does not support scatter-gather which is\n", 130 hcd->driver->description); 131 dev_warn(&udev->dev, 132 "required by the UAS driver. Please try an other USB controller if you wish to use UAS.\n"); 133 return 0; 134 } 135 136 if (udev->speed >= USB_SPEED_SUPER && !hcd->can_do_streams) { 137 dev_warn(&udev->dev, 138 "USB controller %s does not support streams, which are required by the UAS driver.\n", 139 hcd_to_bus(hcd)->bus_name); 140 dev_warn(&udev->dev, 141 "Please try an other USB controller if you wish to use UAS.\n"); 142 return 0; 143 } 144 145 if (flags_ret) 146 *flags_ret = flags; 147 148 return 1; 149 } 150