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