drivers/usb/core/hcd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright Linus Torvalds 1999
   4  * (C) Copyright Johannes Erdfelt 1999-2001
   5  * (C) Copyright Andreas Gal 1999
   6  * (C) Copyright Gregory P. Smith 1999
   7  * (C) Copyright Deti Fliegl 1999
   8  * (C) Copyright Randy Dunlap 2000
   9  * (C) Copyright David Brownell 2000-2002
  10  */
  11
  12 #include <linux/bcd.h>
  13 #include <linux/module.h>
  14 #include <linux/version.h>
  15 #include <linux/kernel.h>
  16 #include <linux/sched/task_stack.h>
  17 #include <linux/slab.h>
  18 #include <linux/completion.h>
  19 #include <linux/utsname.h>
  20 #include <linux/mm.h>
  21 #include <asm/io.h>
  22 #include <linux/device.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/mutex.h>
  25 #include <asm/irq.h>
  26 #include <asm/byteorder.h>
  27 #include <asm/unaligned.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/workqueue.h>
  30 #include <linux/pm_runtime.h>
  31 #include <linux/types.h>
  32 #include <linux/genalloc.h>
  33 #include <linux/io.h>
  34 #include <linux/kcov.h>
  35
  36 #include <linux/phy/phy.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/hcd.h>
  39 #include <linux/usb/otg.h>
  40
  41 #include "usb.h"
  42 #include "phy.h"
  43
  44
  45 /*-------------------------------------------------------------------------*/
  46
  47 /*
  48  * USB Host Controller Driver framework
  49  *
  50  * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
  51  * HCD-specific behaviors/bugs.
  52  *
  53  * This does error checks, tracks devices and urbs, and delegates to a
  54  * "hc_driver" only for code (and data) that really needs to know about
  55  * hardware differences.  That includes root hub registers, i/o queues,
  56  * and so on ... but as little else as possible.
  57  *
  58  * Shared code includes most of the "root hub" code (these are emulated,
  59  * though each HC's hardware works differently) and PCI glue, plus request
  60  * tracking overhead.  The HCD code should only block on spinlocks or on
  61  * hardware handshaking; blocking on software events (such as other kernel
  62  * threads releasing resources, or completing actions) is all generic.
  63  *
  64  * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
  65  * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
  66  * only by the hub driver ... and that neither should be seen or used by
  67  * usb client device drivers.
  68  *
  69  * Contributors of ideas or unattributed patches include: David Brownell,
  70  * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
  71  *
  72  * HISTORY:
  73  * 2002-02-21   Pull in most of the usb_bus support from usb.c; some
  74  *              associated cleanup.  "usb_hcd" still != "usb_bus".
  75  * 2001-12-12   Initial patch version for Linux 2.5.1 kernel.
  76  */
  77
  78 /*-------------------------------------------------------------------------*/
  79
  80 /* Keep track of which host controller drivers are loaded */
  81 unsigned long usb_hcds_loaded;
  82 EXPORT_SYMBOL_GPL(usb_hcds_loaded);
  83
  84 /* host controllers we manage */
  85 DEFINE_IDR (usb_bus_idr);
  86 EXPORT_SYMBOL_GPL (usb_bus_idr);
  87
  88 /* used when allocating bus numbers */
  89 #define USB_MAXBUS              64
  90
  91 /* used when updating list of hcds */
  92 DEFINE_MUTEX(usb_bus_idr_lock); /* exported only for usbfs */
  93 EXPORT_SYMBOL_GPL (usb_bus_idr_lock);
  94
  95 /* used for controlling access to virtual root hubs */
  96 static DEFINE_SPINLOCK(hcd_root_hub_lock);
  97
  98 /* used when updating an endpoint's URB list */
  99 static DEFINE_SPINLOCK(hcd_urb_list_lock);
 100
 101 /* used to protect against unlinking URBs after the device is gone */
 102 static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
 103
 104 /* wait queue for synchronous unlinks */
 105 DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
 106
 107 /*-------------------------------------------------------------------------*/
 108
 109 /*
 110  * Sharable chunks of root hub code.
 111  */
 112
 113 /*-------------------------------------------------------------------------*/
 114 #define KERNEL_REL      bin2bcd(LINUX_VERSION_MAJOR)
 115 #define KERNEL_VER      bin2bcd(LINUX_VERSION_PATCHLEVEL)
 116
 117 /* usb 3.1 root hub device descriptor */
 118 static const u8 usb31_rh_dev_descriptor[18] = {
 119         0x12,       /*  __u8  bLength; */
 120         USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
 121         0x10, 0x03, /*  __le16 bcdUSB; v3.1 */
 122
 123         0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
 124         0x00,       /*  __u8  bDeviceSubClass; */
 125         0x03,       /*  __u8  bDeviceProtocol; USB 3 hub */
 126         0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */
 127
 128         0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
 129         0x03, 0x00, /*  __le16 idProduct; device 0x0003 */
 130         KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
 131
 132         0x03,       /*  __u8  iManufacturer; */
 133         0x02,       /*  __u8  iProduct; */
 134         0x01,       /*  __u8  iSerialNumber; */
 135         0x01        /*  __u8  bNumConfigurations; */
 136 };
 137
 138 /* usb 3.0 root hub device descriptor */
 139 static const u8 usb3_rh_dev_descriptor[18] = {
 140         0x12,       /*  __u8  bLength; */
 141         USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
 142         0x00, 0x03, /*  __le16 bcdUSB; v3.0 */
 143
 144         0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
 145         0x00,       /*  __u8  bDeviceSubClass; */
 146         0x03,       /*  __u8  bDeviceProtocol; USB 3.0 hub */
 147         0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */
 148
 149         0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
 150         0x03, 0x00, /*  __le16 idProduct; device 0x0003 */
 151         KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
 152
 153         0x03,       /*  __u8  iManufacturer; */
 154         0x02,       /*  __u8  iProduct; */
 155         0x01,       /*  __u8  iSerialNumber; */
 156         0x01        /*  __u8  bNumConfigurations; */
 157 };
 158
 159 /* usb 2.0 root hub device descriptor */
 160 static const u8 usb2_rh_dev_descriptor[18] = {
 161         0x12,       /*  __u8  bLength; */
 162         USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
 163         0x00, 0x02, /*  __le16 bcdUSB; v2.0 */
 164
 165         0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
 166         0x00,       /*  __u8  bDeviceSubClass; */
 167         0x00,       /*  __u8  bDeviceProtocol; [ usb 2.0 no TT ] */
 168         0x40,       /*  __u8  bMaxPacketSize0; 64 Bytes */
 169
 170         0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
 171         0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
 172         KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
 173
 174         0x03,       /*  __u8  iManufacturer; */
 175         0x02,       /*  __u8  iProduct; */
 176         0x01,       /*  __u8  iSerialNumber; */
 177         0x01        /*  __u8  bNumConfigurations; */
 178 };
 179
 180 /* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
 181
 182 /* usb 1.1 root hub device descriptor */
 183 static const u8 usb11_rh_dev_descriptor[18] = {
 184         0x12,       /*  __u8  bLength; */
 185         USB_DT_DEVICE, /* __u8 bDescriptorType; Device */
 186         0x10, 0x01, /*  __le16 bcdUSB; v1.1 */
 187
 188         0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
 189         0x00,       /*  __u8  bDeviceSubClass; */
 190         0x00,       /*  __u8  bDeviceProtocol; [ low/full speeds only ] */
 191         0x40,       /*  __u8  bMaxPacketSize0; 64 Bytes */
 192
 193         0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation 0x1d6b */
 194         0x01, 0x00, /*  __le16 idProduct; device 0x0001 */
 195         KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
 196
 197         0x03,       /*  __u8  iManufacturer; */
 198         0x02,       /*  __u8  iProduct; */
 199         0x01,       /*  __u8  iSerialNumber; */
 200         0x01        /*  __u8  bNumConfigurations; */
 201 };
 202
 203
 204 /*-------------------------------------------------------------------------*/
 205
 206 /* Configuration descriptors for our root hubs */
 207
 208 static const u8 fs_rh_config_descriptor[] = {
 209
 210         /* one configuration */
 211         0x09,       /*  __u8  bLength; */
 212         USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
 213         0x19, 0x00, /*  __le16 wTotalLength; */
 214         0x01,       /*  __u8  bNumInterfaces; (1) */
 215         0x01,       /*  __u8  bConfigurationValue; */
 216         0x00,       /*  __u8  iConfiguration; */
 217         0xc0,       /*  __u8  bmAttributes;
 218                                  Bit 7: must be set,
 219                                      6: Self-powered,
 220                                      5: Remote wakeup,
 221                                      4..0: resvd */
 222         0x00,       /*  __u8  MaxPower; */
 223
 224         /* USB 1.1:
 225          * USB 2.0, single TT organization (mandatory):
 226          *      one interface, protocol 0
 227          *
 228          * USB 2.0, multiple TT organization (optional):
 229          *      two interfaces, protocols 1 (like single TT)
 230          *      and 2 (multiple TT mode) ... config is
 231          *      sometimes settable
 232          *      NOT IMPLEMENTED
 233          */
 234
 235         /* one interface */
 236         0x09,       /*  __u8  if_bLength; */
 237         USB_DT_INTERFACE,  /* __u8 if_bDescriptorType; Interface */
 238         0x00,       /*  __u8  if_bInterfaceNumber; */
 239         0x00,       /*  __u8  if_bAlternateSetting; */
 240         0x01,       /*  __u8  if_bNumEndpoints; */
 241         0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
 242         0x00,       /*  __u8  if_bInterfaceSubClass; */
 243         0x00,       /*  __u8  if_bInterfaceProtocol; [usb1.1 or single tt] */
 244         0x00,       /*  __u8  if_iInterface; */
 245
 246         /* one endpoint (status change endpoint) */
 247         0x07,       /*  __u8  ep_bLength; */
 248         USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
 249         0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
 250         0x03,       /*  __u8  ep_bmAttributes; Interrupt */
 251         0x02, 0x00, /*  __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
 252         0xff        /*  __u8  ep_bInterval; (255ms -- usb 2.0 spec) */
 253 };
 254
 255 static const u8 hs_rh_config_descriptor[] = {
 256
 257         /* one configuration */
 258         0x09,       /*  __u8  bLength; */
 259         USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
 260         0x19, 0x00, /*  __le16 wTotalLength; */
 261         0x01,       /*  __u8  bNumInterfaces; (1) */
 262         0x01,       /*  __u8  bConfigurationValue; */
 263         0x00,       /*  __u8  iConfiguration; */
 264         0xc0,       /*  __u8  bmAttributes;
 265                                  Bit 7: must be set,
 266                                      6: Self-powered,
 267                                      5: Remote wakeup,
 268                                      4..0: resvd */
 269         0x00,       /*  __u8  MaxPower; */
 270
 271         /* USB 1.1:
 272          * USB 2.0, single TT organization (mandatory):
 273          *      one interface, protocol 0
 274          *
 275          * USB 2.0, multiple TT organization (optional):
 276          *      two interfaces, protocols 1 (like single TT)
 277          *      and 2 (multiple TT mode) ... config is
 278          *      sometimes settable
 279          *      NOT IMPLEMENTED
 280          */
 281
 282         /* one interface */
 283         0x09,       /*  __u8  if_bLength; */
 284         USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
 285         0x00,       /*  __u8  if_bInterfaceNumber; */
 286         0x00,       /*  __u8  if_bAlternateSetting; */
 287         0x01,       /*  __u8  if_bNumEndpoints; */
 288         0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
 289         0x00,       /*  __u8  if_bInterfaceSubClass; */
 290         0x00,       /*  __u8  if_bInterfaceProtocol; [usb1.1 or single tt] */
 291         0x00,       /*  __u8  if_iInterface; */
 292
 293         /* one endpoint (status change endpoint) */
 294         0x07,       /*  __u8  ep_bLength; */
 295         USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
 296         0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
 297         0x03,       /*  __u8  ep_bmAttributes; Interrupt */
 298                     /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
 299                      * see hub.c:hub_configure() for details. */
 300         (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
 301         0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
 302 };
 303
 304 static const u8 ss_rh_config_descriptor[] = {
 305         /* one configuration */
 306         0x09,       /*  __u8  bLength; */
 307         USB_DT_CONFIG, /* __u8 bDescriptorType; Configuration */
 308         0x1f, 0x00, /*  __le16 wTotalLength; */
 309         0x01,       /*  __u8  bNumInterfaces; (1) */
 310         0x01,       /*  __u8  bConfigurationValue; */
 311         0x00,       /*  __u8  iConfiguration; */
 312         0xc0,       /*  __u8  bmAttributes;
 313                                  Bit 7: must be set,
 314                                      6: Self-powered,
 315                                      5: Remote wakeup,
 316                                      4..0: resvd */
 317         0x00,       /*  __u8  MaxPower; */
 318
 319         /* one interface */
 320         0x09,       /*  __u8  if_bLength; */
 321         USB_DT_INTERFACE, /* __u8 if_bDescriptorType; Interface */
 322         0x00,       /*  __u8  if_bInterfaceNumber; */
 323         0x00,       /*  __u8  if_bAlternateSetting; */
 324         0x01,       /*  __u8  if_bNumEndpoints; */
 325         0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
 326         0x00,       /*  __u8  if_bInterfaceSubClass; */
 327         0x00,       /*  __u8  if_bInterfaceProtocol; */
 328         0x00,       /*  __u8  if_iInterface; */
 329
 330         /* one endpoint (status change endpoint) */
 331         0x07,       /*  __u8  ep_bLength; */
 332         USB_DT_ENDPOINT, /* __u8 ep_bDescriptorType; Endpoint */
 333         0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
 334         0x03,       /*  __u8  ep_bmAttributes; Interrupt */
 335                     /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
 336                      * see hub.c:hub_configure() for details. */
 337         (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
 338         0x0c,       /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
 339
 340         /* one SuperSpeed endpoint companion descriptor */
 341         0x06,        /* __u8 ss_bLength */
 342         USB_DT_SS_ENDPOINT_COMP, /* __u8 ss_bDescriptorType; SuperSpeed EP */
 343                      /* Companion */
 344         0x00,        /* __u8 ss_bMaxBurst; allows 1 TX between ACKs */
 345         0x00,        /* __u8 ss_bmAttributes; 1 packet per service interval */
 346         0x02, 0x00   /* __le16 ss_wBytesPerInterval; 15 bits for max 15 ports */
 347 };
 348
 349 /* authorized_default behaviour:
 350  * -1 is authorized for all devices (leftover from wireless USB)
 351  * 0 is unauthorized for all devices
 352  * 1 is authorized for all devices
 353  * 2 is authorized for internal devices
 354  */
 355 #define USB_AUTHORIZE_WIRED     -1
 356 #define USB_AUTHORIZE_NONE      0
 357 #define USB_AUTHORIZE_ALL       1
 358 #define USB_AUTHORIZE_INTERNAL  2
 359
 360 static int authorized_default = CONFIG_USB_DEFAULT_AUTHORIZATION_MODE;
 361 module_param(authorized_default, int, S_IRUGO|S_IWUSR);
 362 MODULE_PARM_DESC(authorized_default,
 363                 "Default USB device authorization: 0 is not authorized, 1 is authorized (default), 2 is authorized for internal devices, -1 is authorized (same as 1)");
 364 /*-------------------------------------------------------------------------*/
 365
 366 /**
 367  * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
 368  * @s: Null-terminated ASCII (actually ISO-8859-1) string
 369  * @buf: Buffer for USB string descriptor (header + UTF-16LE)
 370  * @len: Length (in bytes; may be odd) of descriptor buffer.
 371  *
 372  * Return: The number of bytes filled in: 2 + 2*strlen(s) or @len,
 373  * whichever is less.
 374  *
 375  * Note:
 376  * USB String descriptors can contain at most 126 characters; input
 377  * strings longer than that are truncated.
 378  */
 379 static unsigned
 380 ascii2desc(char const *s, u8 *buf, unsigned len)
 381 {
 382         unsigned n, t = 2 + 2*strlen(s);
 383
 384         if (t > 254)
 385                 t = 254;        /* Longest possible UTF string descriptor */
 386         if (len > t)
 387                 len = t;
 388
 389         t += USB_DT_STRING << 8;        /* Now t is first 16 bits to store */
 390
 391         n = len;
 392         while (n--) {
 393                 *buf++ = t;
 394                 if (!n--)
 395                         break;
 396                 *buf++ = t >> 8;
 397                 t = (unsigned char)*s++;
 398         }
 399         return len;
 400 }
 401
 402 /**
 403  * rh_string() - provides string descriptors for root hub
 404  * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
 405  * @hcd: the host controller for this root hub
 406  * @data: buffer for output packet
 407  * @len: length of the provided buffer
 408  *
 409  * Produces either a manufacturer, product or serial number string for the
 410  * virtual root hub device.
 411  *
 412  * Return: The number of bytes filled in: the length of the descriptor or
 413  * of the provided buffer, whichever is less.
 414  */
 415 static unsigned
 416 rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
 417 {
 418         char buf[100];
 419         char const *s;
 420         static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
 421
 422         /* language ids */
 423         switch (id) {
 424         case 0:
 425                 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
 426                 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
 427                 if (len > 4)
 428                         len = 4;
 429                 memcpy(data, langids, len);
 430                 return len;
 431         case 1:
 432                 /* Serial number */
 433                 s = hcd->self.bus_name;
 434                 break;
 435         case 2:
 436                 /* Product name */
 437                 s = hcd->product_desc;
 438                 break;
 439         case 3:
 440                 /* Manufacturer */
 441                 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
 442                         init_utsname()->release, hcd->driver->description);
 443                 s = buf;
 444                 break;
 445         default:
 446                 /* Can't happen; caller guarantees it */
 447                 return 0;
 448         }
 449
 450         return ascii2desc(s, data, len);
 451 }
 452
 453
 454 /* Root hub control transfers execute synchronously */
 455 static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
 456 {
 457         struct usb_ctrlrequest *cmd;
 458         u16             typeReq, wValue, wIndex, wLength;
 459         u8              *ubuf = urb->transfer_buffer;
 460         unsigned        len = 0;
 461         int             status;
 462         u8              patch_wakeup = 0;
 463         u8              patch_protocol = 0;
 464         u16             tbuf_size;
 465         u8              *tbuf = NULL;
 466         const u8        *bufp;
 467
 468         might_sleep();
 469
 470         spin_lock_irq(&hcd_root_hub_lock);
 471         status = usb_hcd_link_urb_to_ep(hcd, urb);
 472         spin_unlock_irq(&hcd_root_hub_lock);
 473         if (status)
 474                 return status;
 475         urb->hcpriv = hcd;      /* Indicate it's queued */
 476
 477         cmd = (struct usb_ctrlrequest *) urb->setup_packet;
 478         typeReq  = (cmd->bRequestType << 8) | cmd->bRequest;
 479         wValue   = le16_to_cpu (cmd->wValue);
 480         wIndex   = le16_to_cpu (cmd->wIndex);
 481         wLength  = le16_to_cpu (cmd->wLength);
 482
 483         if (wLength > urb->transfer_buffer_length)
 484                 goto error;
 485
 486         /*
 487          * tbuf should be at least as big as the
 488          * USB hub descriptor.
 489          */
 490         tbuf_size =  max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
 491         tbuf = kzalloc(tbuf_size, GFP_KERNEL);
 492         if (!tbuf) {
 493                 status = -ENOMEM;
 494                 goto err_alloc;
 495         }
 496
 497         bufp = tbuf;
 498
 499
 500         urb->actual_length = 0;
 501         switch (typeReq) {
 502
 503         /* DEVICE REQUESTS */
 504
 505         /* The root hub's remote wakeup enable bit is implemented using
 506          * driver model wakeup flags.  If this system supports wakeup
 507          * through USB, userspace may change the default "allow wakeup"
 508          * policy through sysfs or these calls.
 509          *
 510          * Most root hubs support wakeup from downstream devices, for
 511          * runtime power management (disabling USB clocks and reducing
 512          * VBUS power usage).  However, not all of them do so; silicon,
 513          * board, and BIOS bugs here are not uncommon, so these can't
 514          * be treated quite like external hubs.
 515          *
 516          * Likewise, not all root hubs will pass wakeup events upstream,
 517          * to wake up the whole system.  So don't assume root hub and
 518          * controller capabilities are identical.
 519          */
 520
 521         case DeviceRequest | USB_REQ_GET_STATUS:
 522                 tbuf[0] = (device_may_wakeup(&hcd->self.root_hub->dev)
 523                                         << USB_DEVICE_REMOTE_WAKEUP)
 524                                 | (1 << USB_DEVICE_SELF_POWERED);
 525                 tbuf[1] = 0;
 526                 len = 2;
 527                 break;
 528         case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
 529                 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
 530                         device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
 531                 else
 532                         goto error;
 533                 break;
 534         case DeviceOutRequest | USB_REQ_SET_FEATURE:
 535                 if (device_can_wakeup(&hcd->self.root_hub->dev)
 536                                 && wValue == USB_DEVICE_REMOTE_WAKEUP)
 537                         device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
 538                 else
 539                         goto error;
 540                 break;
 541         case DeviceRequest | USB_REQ_GET_CONFIGURATION:
 542                 tbuf[0] = 1;
 543                 len = 1;
 544                 fallthrough;
 545         case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
 546                 break;
 547         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 548                 switch (wValue & 0xff00) {
 549                 case USB_DT_DEVICE << 8:
 550                         switch (hcd->speed) {
 551                         case HCD_USB32:
 552                         case HCD_USB31:
 553                                 bufp = usb31_rh_dev_descriptor;
 554                                 break;
 555                         case HCD_USB3:
 556                                 bufp = usb3_rh_dev_descriptor;
 557                                 break;
 558                         case HCD_USB2:
 559                                 bufp = usb2_rh_dev_descriptor;
 560                                 break;
 561                         case HCD_USB11:
 562                                 bufp = usb11_rh_dev_descriptor;
 563                                 break;
 564                         default:
 565                                 goto error;
 566                         }
 567                         len = 18;
 568                         if (hcd->has_tt)
 569                                 patch_protocol = 1;
 570                         break;
 571                 case USB_DT_CONFIG << 8:
 572                         switch (hcd->speed) {
 573                         case HCD_USB32:
 574                         case HCD_USB31:
 575                         case HCD_USB3:
 576                                 bufp = ss_rh_config_descriptor;
 577                                 len = sizeof ss_rh_config_descriptor;
 578                                 break;
 579                         case HCD_USB2:
 580                                 bufp = hs_rh_config_descriptor;
 581                                 len = sizeof hs_rh_config_descriptor;
 582                                 break;
 583                         case HCD_USB11:
 584                                 bufp = fs_rh_config_descriptor;
 585                                 len = sizeof fs_rh_config_descriptor;
 586                                 break;
 587                         default:
 588                                 goto error;
 589                         }
 590                         if (device_can_wakeup(&hcd->self.root_hub->dev))
 591                                 patch_wakeup = 1;
 592                         break;
 593                 case USB_DT_STRING << 8:
 594                         if ((wValue & 0xff) < 4)
 595                                 urb->actual_length = rh_string(wValue & 0xff,
 596                                                 hcd, ubuf, wLength);
 597                         else /* unsupported IDs --> "protocol stall" */
 598                                 goto error;
 599                         break;
 600                 case USB_DT_BOS << 8:
 601                         goto nongeneric;
 602                 default:
 603                         goto error;
 604                 }
 605                 break;
 606         case DeviceRequest | USB_REQ_GET_INTERFACE:
 607                 tbuf[0] = 0;
 608                 len = 1;
 609                 fallthrough;
 610         case DeviceOutRequest | USB_REQ_SET_INTERFACE:
 611                 break;
 612         case DeviceOutRequest | USB_REQ_SET_ADDRESS:
 613                 /* wValue == urb->dev->devaddr */
 614                 dev_dbg (hcd->self.controller, "root hub device address %d\n",
 615                         wValue);
 616                 break;
 617
 618         /* INTERFACE REQUESTS (no defined feature/status flags) */
 619
 620         /* ENDPOINT REQUESTS */
 621
 622         case EndpointRequest | USB_REQ_GET_STATUS:
 623                 /* ENDPOINT_HALT flag */
 624                 tbuf[0] = 0;
 625                 tbuf[1] = 0;
 626                 len = 2;
 627                 fallthrough;
 628         case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 629         case EndpointOutRequest | USB_REQ_SET_FEATURE:
 630                 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
 631                 break;
 632
 633         /* CLASS REQUESTS (and errors) */
 634
 635         default:
 636 nongeneric:
 637                 /* non-generic request */
 638                 switch (typeReq) {
 639                 case GetHubStatus:
 640                         len = 4;
 641                         break;
 642                 case GetPortStatus:
 643                         if (wValue == HUB_PORT_STATUS)
 644                                 len = 4;
 645                         else
 646                                 /* other port status types return 8 bytes */
 647                                 len = 8;
 648                         break;
 649                 case GetHubDescriptor:
 650                         len = sizeof (struct usb_hub_descriptor);
 651                         break;
 652                 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
 653                         /* len is returned by hub_control */
 654                         break;
 655                 }
 656                 status = hcd->driver->hub_control (hcd,
 657                         typeReq, wValue, wIndex,
 658                         tbuf, wLength);
 659
 660                 if (typeReq == GetHubDescriptor)
 661                         usb_hub_adjust_deviceremovable(hcd->self.root_hub,
 662                                 (struct usb_hub_descriptor *)tbuf);
 663                 break;
 664 error:
 665                 /* "protocol stall" on error */
 666                 status = -EPIPE;
 667         }
 668
 669         if (status < 0) {
 670                 len = 0;
 671                 if (status != -EPIPE) {
 672                         dev_dbg (hcd->self.controller,
 673                                 "CTRL: TypeReq=0x%x val=0x%x "
 674                                 "idx=0x%x len=%d ==> %d\n",
 675                                 typeReq, wValue, wIndex,
 676                                 wLength, status);
 677                 }
 678         } else if (status > 0) {
 679                 /* hub_control may return the length of data copied. */
 680                 len = status;
 681                 status = 0;
 682         }
 683         if (len) {
 684                 if (urb->transfer_buffer_length < len)
 685                         len = urb->transfer_buffer_length;
 686                 urb->actual_length = len;
 687                 /* always USB_DIR_IN, toward host */
 688                 memcpy (ubuf, bufp, len);
 689
 690                 /* report whether RH hardware supports remote wakeup */
 691                 if (patch_wakeup &&
 692                                 len > offsetof (struct usb_config_descriptor,
 693                                                 bmAttributes))
 694                         ((struct usb_config_descriptor *)ubuf)->bmAttributes
 695                                 |= USB_CONFIG_ATT_WAKEUP;
 696
 697                 /* report whether RH hardware has an integrated TT */
 698                 if (patch_protocol &&
 699                                 len > offsetof(struct usb_device_descriptor,
 700                                                 bDeviceProtocol))
 701                         ((struct usb_device_descriptor *) ubuf)->
 702                                 bDeviceProtocol = USB_HUB_PR_HS_SINGLE_TT;
 703         }
 704
 705         kfree(tbuf);
 706  err_alloc:
 707
 708         /* any errors get returned through the urb completion */
 709         spin_lock_irq(&hcd_root_hub_lock);
 710         usb_hcd_unlink_urb_from_ep(hcd, urb);
 711         usb_hcd_giveback_urb(hcd, urb, status);
 712         spin_unlock_irq(&hcd_root_hub_lock);
 713         return 0;
 714 }
 715
 716 /*-------------------------------------------------------------------------*/
 717
 718 /*
 719  * Root Hub interrupt transfers are polled using a timer if the
 720  * driver requests it; otherwise the driver is responsible for
 721  * calling usb_hcd_poll_rh_status() when an event occurs.
 722  *
 723  * Completion handler may not sleep. See usb_hcd_giveback_urb() for details.
 724  */
 725 void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
 726 {
 727         struct urb      *urb;
 728         int             length;
 729         int             status;
 730         unsigned long   flags;
 731         char            buffer[6];      /* Any root hubs with > 31 ports? */
 732
 733         if (unlikely(!hcd->rh_pollable))
 734                 return;
 735         if (!hcd->uses_new_polling && !hcd->status_urb)
 736                 return;
 737
 738         length = hcd->driver->hub_status_data(hcd, buffer);
 739         if (length > 0) {
 740
 741                 /* try to complete the status urb */
 742                 spin_lock_irqsave(&hcd_root_hub_lock, flags);
 743                 urb = hcd->status_urb;
 744                 if (urb) {
 745                         clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
 746                         hcd->status_urb = NULL;
 747                         if (urb->transfer_buffer_length >= length) {
 748                                 status = 0;
 749                         } else {
 750                                 status = -EOVERFLOW;
 751                                 length = urb->transfer_buffer_length;
 752                         }
 753                         urb->actual_length = length;
 754                         memcpy(urb->transfer_buffer, buffer, length);
 755
 756                         usb_hcd_unlink_urb_from_ep(hcd, urb);
 757                         usb_hcd_giveback_urb(hcd, urb, status);
 758                 } else {
 759                         length = 0;
 760                         set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
 761                 }
 762                 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
 763         }
 764
 765         /* The USB 2.0 spec says 256 ms.  This is close enough and won't
 766          * exceed that limit if HZ is 100. The math is more clunky than
 767          * maybe expected, this is to make sure that all timers for USB devices
 768          * fire at the same time to give the CPU a break in between */
 769         if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
 770                         (length == 0 && hcd->status_urb != NULL))
 771                 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
 772 }
 773 EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
 774
 775 /* timer callback */
 776 static void rh_timer_func (struct timer_list *t)
 777 {
 778         struct usb_hcd *_hcd = from_timer(_hcd, t, rh_timer);
 779
 780         usb_hcd_poll_rh_status(_hcd);
 781 }
 782
 783 /*-------------------------------------------------------------------------*/
 784
 785 static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
 786 {
 787         int             retval;
 788         unsigned long   flags;
 789         unsigned        len = 1 + (urb->dev->maxchild / 8);
 790
 791         spin_lock_irqsave (&hcd_root_hub_lock, flags);
 792         if (hcd->status_urb || urb->transfer_buffer_length < len) {
 793                 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
 794                 retval = -EINVAL;
 795                 goto done;
 796         }
 797
 798         retval = usb_hcd_link_urb_to_ep(hcd, urb);
 799         if (retval)
 800                 goto done;
 801
 802         hcd->status_urb = urb;
 803         urb->hcpriv = hcd;      /* indicate it's queued */
 804         if (!hcd->uses_new_polling)
 805                 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
 806
 807         /* If a status change has already occurred, report it ASAP */
 808         else if (HCD_POLL_PENDING(hcd))
 809                 mod_timer(&hcd->rh_timer, jiffies);
 810         retval = 0;
 811  done:
 812         spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
 813         return retval;
 814 }
 815
 816 static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
 817 {
 818         if (usb_endpoint_xfer_int(&urb->ep->desc))
 819                 return rh_queue_status (hcd, urb);
 820         if (usb_endpoint_xfer_control(&urb->ep->desc))
 821                 return rh_call_control (hcd, urb);
 822         return -EINVAL;
 823 }
 824
 825 /*-------------------------------------------------------------------------*/
 826
 827 /* Unlinks of root-hub control URBs are legal, but they don't do anything
 828  * since these URBs always execute synchronously.
 829  */
 830 static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 831 {
 832         unsigned long   flags;
 833         int             rc;
 834
 835         spin_lock_irqsave(&hcd_root_hub_lock, flags);
 836         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
 837         if (rc)
 838                 goto done;
 839
 840         if (usb_endpoint_num(&urb->ep->desc) == 0) {    /* Control URB */
 841                 ;       /* Do nothing */
 842
 843         } else {                                /* Status URB */
 844                 if (!hcd->uses_new_polling)
 845                         del_timer (&hcd->rh_timer);
 846                 if (urb == hcd->status_urb) {
 847                         hcd->status_urb = NULL;
 848                         usb_hcd_unlink_urb_from_ep(hcd, urb);
 849                         usb_hcd_giveback_urb(hcd, urb, status);
 850                 }
 851         }
 852  done:
 853         spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
 854         return rc;
 855 }
 856
 857
 858 /*-------------------------------------------------------------------------*/
 859
 860 /**
 861  * usb_bus_init - shared initialization code
 862  * @bus: the bus structure being initialized
 863  *
 864  * This code is used to initialize a usb_bus structure, memory for which is
 865  * separately managed.
 866  */
 867 static void usb_bus_init (struct usb_bus *bus)
 868 {
 869         memset (&bus->devmap, 0, sizeof(struct usb_devmap));
 870
 871         bus->devnum_next = 1;
 872
 873         bus->root_hub = NULL;
 874         bus->busnum = -1;
 875         bus->bandwidth_allocated = 0;
 876         bus->bandwidth_int_reqs  = 0;
 877         bus->bandwidth_isoc_reqs = 0;
 878         mutex_init(&bus->devnum_next_mutex);
 879 }
 880
 881 /*-------------------------------------------------------------------------*/
 882
 883 /**
 884  * usb_register_bus - registers the USB host controller with the usb core
 885  * @bus: pointer to the bus to register
 886  *
 887  * Context: task context, might sleep.
 888  *
 889  * Assigns a bus number, and links the controller into usbcore data
 890  * structures so that it can be seen by scanning the bus list.
 891  *
 892  * Return: 0 if successful. A negative error code otherwise.
 893  */
 894 static int usb_register_bus(struct usb_bus *bus)
 895 {
 896         int result = -E2BIG;
 897         int busnum;
 898
 899         mutex_lock(&usb_bus_idr_lock);
 900         busnum = idr_alloc(&usb_bus_idr, bus, 1, USB_MAXBUS, GFP_KERNEL);
 901         if (busnum < 0) {
 902                 pr_err("%s: failed to get bus number\n", usbcore_name);
 903                 goto error_find_busnum;
 904         }
 905         bus->busnum = busnum;
 906         mutex_unlock(&usb_bus_idr_lock);
 907
 908         usb_notify_add_bus(bus);
 909
 910         dev_info (bus->controller, "new USB bus registered, assigned bus "
 911                   "number %d\n", bus->busnum);
 912         return 0;
 913
 914 error_find_busnum:
 915         mutex_unlock(&usb_bus_idr_lock);
 916         return result;
 917 }
 918
 919 /**
 920  * usb_deregister_bus - deregisters the USB host controller
 921  * @bus: pointer to the bus to deregister
 922  *
 923  * Context: task context, might sleep.
 924  *
 925  * Recycles the bus number, and unlinks the controller from usbcore data
 926  * structures so that it won't be seen by scanning the bus list.
 927  */
 928 static void usb_deregister_bus (struct usb_bus *bus)
 929 {
 930         dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
 931
 932         /*
 933          * NOTE: make sure that all the devices are removed by the
 934          * controller code, as well as having it call this when cleaning
 935          * itself up
 936          */
 937         mutex_lock(&usb_bus_idr_lock);
 938         idr_remove(&usb_bus_idr, bus->busnum);
 939         mutex_unlock(&usb_bus_idr_lock);
 940
 941         usb_notify_remove_bus(bus);
 942 }
 943
 944 /**
 945  * register_root_hub - called by usb_add_hcd() to register a root hub
 946  * @hcd: host controller for this root hub
 947  *
 948  * This function registers the root hub with the USB subsystem.  It sets up
 949  * the device properly in the device tree and then calls usb_new_device()
 950  * to register the usb device.  It also assigns the root hub's USB address
 951  * (always 1).
 952  *
 953  * Return: 0 if successful. A negative error code otherwise.
 954  */
 955 static int register_root_hub(struct usb_hcd *hcd)
 956 {
 957         struct device *parent_dev = hcd->self.controller;
 958         struct usb_device *usb_dev = hcd->self.root_hub;
 959         struct usb_device_descriptor *descr;
 960         const int devnum = 1;
 961         int retval;
 962
 963         usb_dev->devnum = devnum;
 964         usb_dev->bus->devnum_next = devnum + 1;
 965         set_bit (devnum, usb_dev->bus->devmap.devicemap);
 966         usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
 967
 968         mutex_lock(&usb_bus_idr_lock);
 969
 970         usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
 971         descr = usb_get_device_descriptor(usb_dev);
 972         if (IS_ERR(descr)) {
 973                 retval = PTR_ERR(descr);
 974                 mutex_unlock(&usb_bus_idr_lock);
 975                 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
 976                                 dev_name(&usb_dev->dev), retval);
 977                 return retval;
 978         }
 979         usb_dev->descriptor = *descr;
 980         kfree(descr);
 981
 982         if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
 983                 retval = usb_get_bos_descriptor(usb_dev);
 984                 if (!retval) {
 985                         usb_dev->lpm_capable = usb_device_supports_lpm(usb_dev);
 986                 } else if (usb_dev->speed >= USB_SPEED_SUPER) {
 987                         mutex_unlock(&usb_bus_idr_lock);
 988                         dev_dbg(parent_dev, "can't read %s bos descriptor %d\n",
 989                                         dev_name(&usb_dev->dev), retval);
 990                         return retval;
 991                 }
 992         }
 993
 994         retval = usb_new_device (usb_dev);
 995         if (retval) {
 996                 dev_err (parent_dev, "can't register root hub for %s, %d\n",
 997                                 dev_name(&usb_dev->dev), retval);
 998         } else {
 999                 spin_lock_irq (&hcd_root_hub_lock);
1000                 hcd->rh_registered = 1;
1001                 spin_unlock_irq (&hcd_root_hub_lock);
1002
1003                 /* Did the HC die before the root hub was registered? */
1004                 if (HCD_DEAD(hcd))
1005                         usb_hc_died (hcd);      /* This time clean up */
1006         }
1007         mutex_unlock(&usb_bus_idr_lock);
1008
1009         return retval;
1010 }
1011
1012 /*
1013  * usb_hcd_start_port_resume - a root-hub port is sending a resume signal
1014  * @bus: the bus which the root hub belongs to
1015  * @portnum: the port which is being resumed
1016  *
1017  * HCDs should call this function when they know that a resume signal is
1018  * being sent to a root-hub port.  The root hub will be prevented from
1019  * going into autosuspend until usb_hcd_end_port_resume() is called.
1020  *
1021  * The bus's private lock must be held by the caller.
1022  */
1023 void usb_hcd_start_port_resume(struct usb_bus *bus, int portnum)
1024 {
1025         unsigned bit = 1 << portnum;
1026
1027         if (!(bus->resuming_ports & bit)) {
1028                 bus->resuming_ports |= bit;
1029                 pm_runtime_get_noresume(&bus->root_hub->dev);
1030         }
1031 }
1032 EXPORT_SYMBOL_GPL(usb_hcd_start_port_resume);
1033
1034 /*
1035  * usb_hcd_end_port_resume - a root-hub port has stopped sending a resume signal
1036  * @bus: the bus which the root hub belongs to
1037  * @portnum: the port which is being resumed
1038  *
1039  * HCDs should call this function when they know that a resume signal has
1040  * stopped being sent to a root-hub port.  The root hub will be allowed to
1041  * autosuspend again.
1042  *
1043  * The bus's private lock must be held by the caller.
1044  */
1045 void usb_hcd_end_port_resume(struct usb_bus *bus, int portnum)
1046 {
1047         unsigned bit = 1 << portnum;
1048
1049         if (bus->resuming_ports & bit) {
1050                 bus->resuming_ports &= ~bit;
1051                 pm_runtime_put_noidle(&bus->root_hub->dev);
1052         }
1053 }
1054 EXPORT_SYMBOL_GPL(usb_hcd_end_port_resume);
1055
1056 /*-------------------------------------------------------------------------*/
1057
1058 /**
1059  * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
1060  * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1061  * @is_input: true iff the transaction sends data to the host
1062  * @isoc: true for isochronous transactions, false for interrupt ones
1063  * @bytecount: how many bytes in the transaction.
1064  *
1065  * Return: Approximate bus time in nanoseconds for a periodic transaction.
1066  *
1067  * Note:
1068  * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1069  * scheduled in software, this function is only used for such scheduling.
1070  */
1071 long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1072 {
1073         unsigned long   tmp;
1074
1075         switch (speed) {
1076         case USB_SPEED_LOW:     /* INTR only */
1077                 if (is_input) {
1078                         tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1079                         return 64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1080                 } else {
1081                         tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1082                         return 64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp;
1083                 }
1084         case USB_SPEED_FULL:    /* ISOC or INTR */
1085                 if (isoc) {
1086                         tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1087                         return ((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp;
1088                 } else {
1089                         tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1090                         return 9107L + BW_HOST_DELAY + tmp;
1091                 }
1092         case USB_SPEED_HIGH:    /* ISOC or INTR */
1093                 /* FIXME adjust for input vs output */
1094                 if (isoc)
1095                         tmp = HS_NSECS_ISO (bytecount);
1096                 else
1097                         tmp = HS_NSECS (bytecount);
1098                 return tmp;
1099         default:
1100                 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1101                 return -1;
1102         }
1103 }
1104 EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1105
1106
1107 /*-------------------------------------------------------------------------*/
1108
1109 /*
1110  * Generic HC operations.
1111  */
1112
1113 /*-------------------------------------------------------------------------*/
1114
1115 /**
1116  * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1117  * @hcd: host controller to which @urb was submitted
1118  * @urb: URB being submitted
1119  *
1120  * Host controller drivers should call this routine in their enqueue()
1121  * method.  The HCD's private spinlock must be held and interrupts must
1122  * be disabled.  The actions carried out here are required for URB
1123  * submission, as well as for endpoint shutdown and for usb_kill_urb.
1124  *
1125  * Return: 0 for no error, otherwise a negative error code (in which case
1126  * the enqueue() method must fail).  If no error occurs but enqueue() fails
1127  * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1128  * the private spinlock and returning.
1129  */
1130 int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1131 {
1132         int             rc = 0;
1133
1134         spin_lock(&hcd_urb_list_lock);
1135
1136         /* Check that the URB isn't being killed */
1137         if (unlikely(atomic_read(&urb->reject))) {
1138                 rc = -EPERM;
1139                 goto done;
1140         }
1141
1142         if (unlikely(!urb->ep->enabled)) {
1143                 rc = -ENOENT;
1144                 goto done;
1145         }
1146
1147         if (unlikely(!urb->dev->can_submit)) {
1148                 rc = -EHOSTUNREACH;
1149                 goto done;
1150         }
1151
1152         /*
1153          * Check the host controller's state and add the URB to the
1154          * endpoint's queue.
1155          */
1156         if (HCD_RH_RUNNING(hcd)) {
1157                 urb->unlinked = 0;
1158                 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
1159         } else {
1160                 rc = -ESHUTDOWN;
1161                 goto done;
1162         }
1163  done:
1164         spin_unlock(&hcd_urb_list_lock);
1165         return rc;
1166 }
1167 EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
1168
1169 /**
1170  * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1171  * @hcd: host controller to which @urb was submitted
1172  * @urb: URB being checked for unlinkability
1173  * @status: error code to store in @urb if the unlink succeeds
1174  *
1175  * Host controller drivers should call this routine in their dequeue()
1176  * method.  The HCD's private spinlock must be held and interrupts must
1177  * be disabled.  The actions carried out here are required for making
1178  * sure than an unlink is valid.
1179  *
1180  * Return: 0 for no error, otherwise a negative error code (in which case
1181  * the dequeue() method must fail).  The possible error codes are:
1182  *
1183  *      -EIDRM: @urb was not submitted or has already completed.
1184  *              The completion function may not have been called yet.
1185  *
1186  *      -EBUSY: @urb has already been unlinked.
1187  */
1188 int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
1189                 int status)
1190 {
1191         struct list_head        *tmp;
1192
1193         /* insist the urb is still queued */
1194         list_for_each(tmp, &urb->ep->urb_list) {
1195                 if (tmp == &urb->urb_list)
1196                         break;
1197         }
1198         if (tmp != &urb->urb_list)
1199                 return -EIDRM;
1200
1201         /* Any status except -EINPROGRESS means something already started to
1202          * unlink this URB from the hardware.  So there's no more work to do.
1203          */
1204         if (urb->unlinked)
1205                 return -EBUSY;
1206         urb->unlinked = status;
1207         return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
1210
1211 /**
1212  * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1213  * @hcd: host controller to which @urb was submitted
1214  * @urb: URB being unlinked
1215  *
1216  * Host controller drivers should call this routine before calling
1217  * usb_hcd_giveback_urb().  The HCD's private spinlock must be held and
1218  * interrupts must be disabled.  The actions carried out here are required
1219  * for URB completion.
1220  */
1221 void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
1222 {
1223         /* clear all state linking urb to this dev (and hcd) */
1224         spin_lock(&hcd_urb_list_lock);
1225         list_del_init(&urb->urb_list);
1226         spin_unlock(&hcd_urb_list_lock);
1227 }
1228 EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
1229
1230 /*
1231  * Some usb host controllers can only perform dma using a small SRAM area,
1232  * or have restrictions on addressable DRAM.
1233  * The usb core itself is however optimized for host controllers that can dma
1234  * using regular system memory - like pci devices doing bus mastering.
1235  *
1236  * To support host controllers with limited dma capabilities we provide dma
1237  * bounce buffers. This feature can be enabled by initializing
1238  * hcd->localmem_pool using usb_hcd_setup_local_mem().
1239  *
1240  * The initialized hcd->localmem_pool then tells the usb code to allocate all
1241  * data for dma using the genalloc API.
1242  *
1243  * So, to summarize...
1244  *
1245  * - We need "local" memory, canonical example being
1246  *   a small SRAM on a discrete controller being the
1247  *   only memory that the controller can read ...
1248  *   (a) "normal" kernel memory is no good, and
1249  *   (b) there's not enough to share
1250  *
1251  * - So we use that, even though the primary requirement
1252  *   is that the memory be "local" (hence addressable
1253  *   by that device), not "coherent".
1254  *
1255  */
1256
1257 static int hcd_alloc_coherent(struct usb_bus *bus,
1258                               gfp_t mem_flags, dma_addr_t *dma_handle,
1259                               void **vaddr_handle, size_t size,
1260                               enum dma_data_direction dir)
1261 {
1262         unsigned char *vaddr;
1263
1264         if (*vaddr_handle == NULL) {
1265                 WARN_ON_ONCE(1);
1266                 return -EFAULT;
1267         }
1268
1269         vaddr = hcd_buffer_alloc(bus, size + sizeof(unsigned long),
1270                                  mem_flags, dma_handle);
1271         if (!vaddr)
1272                 return -ENOMEM;
1273
1274         /*
1275          * Store the virtual address of the buffer at the end
1276          * of the allocated dma buffer. The size of the buffer
1277          * may be uneven so use unaligned functions instead
1278          * of just rounding up. It makes sense to optimize for
1279          * memory footprint over access speed since the amount
1280          * of memory available for dma may be limited.
1281          */
1282         put_unaligned((unsigned long)*vaddr_handle,
1283                       (unsigned long *)(vaddr + size));
1284
1285         if (dir == DMA_TO_DEVICE)
1286                 memcpy(vaddr, *vaddr_handle, size);
1287
1288         *vaddr_handle = vaddr;
1289         return 0;
1290 }
1291
1292 static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1293                               void **vaddr_handle, size_t size,
1294                               enum dma_data_direction dir)
1295 {
1296         unsigned char *vaddr = *vaddr_handle;
1297
1298         vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1299
1300         if (dir == DMA_FROM_DEVICE)
1301                 memcpy(vaddr, *vaddr_handle, size);
1302
1303         hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1304
1305         *vaddr_handle = vaddr;
1306         *dma_handle = 0;
1307 }
1308
1309 void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
1310 {
1311         if (IS_ENABLED(CONFIG_HAS_DMA) &&
1312             (urb->transfer_flags & URB_SETUP_MAP_SINGLE))
1313                 dma_unmap_single(hcd->self.sysdev,
1314                                 urb->setup_dma,
1315                                 sizeof(struct usb_ctrlrequest),
1316                                 DMA_TO_DEVICE);
1317         else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1318                 hcd_free_coherent(urb->dev->bus,
1319                                 &urb->setup_dma,
1320                                 (void **) &urb->setup_packet,
1321                                 sizeof(struct usb_ctrlrequest),
1322                                 DMA_TO_DEVICE);
1323
1324         /* Make it safe to call this routine more than once */
1325         urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1326 }
1327 EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
1328
1329 static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1330 {
1331         if (hcd->driver->unmap_urb_for_dma)
1332                 hcd->driver->unmap_urb_for_dma(hcd, urb);
1333         else
1334                 usb_hcd_unmap_urb_for_dma(hcd, urb);
1335 }
1336
1337 void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1338 {
1339         enum dma_data_direction dir;
1340
1341         usb_hcd_unmap_urb_setup_for_dma(hcd, urb);
1342
1343         dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1344         if (IS_ENABLED(CONFIG_HAS_DMA) &&
1345             (urb->transfer_flags & URB_DMA_MAP_SG))
1346                 dma_unmap_sg(hcd->self.sysdev,
1347                                 urb->sg,
1348                                 urb->num_sgs,
1349                                 dir);
1350         else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1351                  (urb->transfer_flags & URB_DMA_MAP_PAGE))
1352                 dma_unmap_page(hcd->self.sysdev,
1353                                 urb->transfer_dma,
1354                                 urb->transfer_buffer_length,
1355                                 dir);
1356         else if (IS_ENABLED(CONFIG_HAS_DMA) &&
1357                  (urb->transfer_flags & URB_DMA_MAP_SINGLE))
1358                 dma_unmap_single(hcd->self.sysdev,
1359                                 urb->transfer_dma,
1360                                 urb->transfer_buffer_length,
1361                                 dir);
1362         else if (urb->transfer_flags & URB_MAP_LOCAL)
1363                 hcd_free_coherent(urb->dev->bus,
1364                                 &urb->transfer_dma,
1365                                 &urb->transfer_buffer,
1366                                 urb->transfer_buffer_length,
1367                                 dir);
1368
1369         /* Make it safe to call this routine more than once */
1370         urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
1371                         URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1372 }
1373 EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
1374
1375 static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1376                            gfp_t mem_flags)
1377 {
1378         if (hcd->driver->map_urb_for_dma)
1379                 return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
1380         else
1381                 return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
1382 }
1383
1384 int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1385                             gfp_t mem_flags)
1386 {
1387         enum dma_data_direction dir;
1388         int ret = 0;
1389
1390         /* Map the URB's buffers for DMA access.
1391          * Lower level HCD code should use *_dma exclusively,
1392          * unless it uses pio or talks to another transport,
1393          * or uses the provided scatter gather list for bulk.
1394          */
1395
1396         if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1397                 if (hcd->self.uses_pio_for_control)
1398                         return ret;
1399                 if (hcd->localmem_pool) {
1400                         ret = hcd_alloc_coherent(
1401                                         urb->dev->bus, mem_flags,
1402                                         &urb->setup_dma,
1403                                         (void **)&urb->setup_packet,
1404                                         sizeof(struct usb_ctrlrequest),
1405                                         DMA_TO_DEVICE);
1406                         if (ret)
1407                                 return ret;
1408                         urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
1409                 } else if (hcd_uses_dma(hcd)) {
1410                         if (object_is_on_stack(urb->setup_packet)) {
1411                                 WARN_ONCE(1, "setup packet is on stack\n");
1412                                 return -EAGAIN;
1413                         }
1414
1415                         urb->setup_dma = dma_map_single(
1416                                         hcd->self.sysdev,
1417                                         urb->setup_packet,
1418                                         sizeof(struct usb_ctrlrequest),
1419                                         DMA_TO_DEVICE);
1420                         if (dma_mapping_error(hcd->self.sysdev,
1421                                                 urb->setup_dma))
1422                                 return -EAGAIN;
1423                         urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
1424                 }
1425         }
1426
1427         dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1428         if (urb->transfer_buffer_length != 0
1429             && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
1430                 if (hcd->localmem_pool) {
1431                         ret = hcd_alloc_coherent(
1432                                         urb->dev->bus, mem_flags,
1433                                         &urb->transfer_dma,
1434                                         &urb->transfer_buffer,
1435                                         urb->transfer_buffer_length,
1436                                         dir);
1437                         if (ret == 0)
1438                                 urb->transfer_flags |= URB_MAP_LOCAL;
1439                 } else if (hcd_uses_dma(hcd)) {
1440                         if (urb->num_sgs) {
1441                                 int n;
1442
1443                                 /* We don't support sg for isoc transfers ! */
1444                                 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1445                                         WARN_ON(1);
1446                                         return -EINVAL;
1447                                 }
1448
1449                                 n = dma_map_sg(
1450                                                 hcd->self.sysdev,
1451                                                 urb->sg,
1452                                                 urb->num_sgs,
1453                                                 dir);
1454                                 if (!n)
1455                                         ret = -EAGAIN;
1456                                 else
1457                                         urb->transfer_flags |= URB_DMA_MAP_SG;
1458                                 urb->num_mapped_sgs = n;
1459                                 if (n != urb->num_sgs)
1460                                         urb->transfer_flags |=
1461                                                         URB_DMA_SG_COMBINED;
1462                         } else if (urb->sg) {
1463                                 struct scatterlist *sg = urb->sg;
1464                                 urb->transfer_dma = dma_map_page(
1465                                                 hcd->self.sysdev,
1466                                                 sg_page(sg),
1467                                                 sg->offset,
1468                                                 urb->transfer_buffer_length,
1469                                                 dir);
1470                                 if (dma_mapping_error(hcd->self.sysdev,
1471                                                 urb->transfer_dma))
1472                                         ret = -EAGAIN;
1473                                 else
1474                                         urb->transfer_flags |= URB_DMA_MAP_PAGE;
1475                         } else if (object_is_on_stack(urb->transfer_buffer)) {
1476                                 WARN_ONCE(1, "transfer buffer is on stack\n");
1477                                 ret = -EAGAIN;
1478                         } else {
1479                                 urb->transfer_dma = dma_map_single(
1480                                                 hcd->self.sysdev,
1481                                                 urb->transfer_buffer,
1482                                                 urb->transfer_buffer_length,
1483                                                 dir);
1484                                 if (dma_mapping_error(hcd->self.sysdev,
1485                                                 urb->transfer_dma))
1486                                         ret = -EAGAIN;
1487                                 else
1488                                         urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1489                         }
1490                 }
1491                 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1492                                 URB_SETUP_MAP_LOCAL)))
1493                         usb_hcd_unmap_urb_for_dma(hcd, urb);
1494         }
1495         return ret;
1496 }
1497 EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
1498
1499 /*-------------------------------------------------------------------------*/
1500
1501 /* may be called in any context with a valid urb->dev usecount
1502  * caller surrenders "ownership" of urb
1503  * expects usb_submit_urb() to have sanity checked and conditioned all
1504  * inputs in the urb
1505  */
1506 int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1507 {
1508         int                     status;
1509         struct usb_hcd          *hcd = bus_to_hcd(urb->dev->bus);
1510
1511         /* increment urb's reference count as part of giving it to the HCD
1512          * (which will control it).  HCD guarantees that it either returns
1513          * an error or calls giveback(), but not both.
1514          */
1515         usb_get_urb(urb);
1516         atomic_inc(&urb->use_count);
1517         atomic_inc(&urb->dev->urbnum);
1518         usbmon_urb_submit(&hcd->self, urb);
1519
1520         /* NOTE requirements on root-hub callers (usbfs and the hub
1521          * driver, for now):  URBs' urb->transfer_buffer must be
1522          * valid and usb_buffer_{sync,unmap}() not be needed, since
1523          * they could clobber root hub response data.  Also, control
1524          * URBs must be submitted in process context with interrupts
1525          * enabled.
1526          */
1527
1528         if (is_root_hub(urb->dev)) {
1529                 status = rh_urb_enqueue(hcd, urb);
1530         } else {
1531                 status = map_urb_for_dma(hcd, urb, mem_flags);
1532                 if (likely(status == 0)) {
1533                         status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1534                         if (unlikely(status))
1535                                 unmap_urb_for_dma(hcd, urb);
1536                 }
1537         }
1538
1539         if (unlikely(status)) {
1540                 usbmon_urb_submit_error(&hcd->self, urb, status);
1541                 urb->hcpriv = NULL;
1542                 INIT_LIST_HEAD(&urb->urb_list);
1543                 atomic_dec(&urb->use_count);
1544                 /*
1545                  * Order the write of urb->use_count above before the read
1546                  * of urb->reject below.  Pairs with the memory barriers in
1547                  * usb_kill_urb() and usb_poison_urb().
1548                  */
1549                 smp_mb__after_atomic();
1550
1551                 atomic_dec(&urb->dev->urbnum);
1552                 if (atomic_read(&urb->reject))
1553                         wake_up(&usb_kill_urb_queue);
1554                 usb_put_urb(urb);
1555         }
1556         return status;
1557 }
1558
1559 /*-------------------------------------------------------------------------*/
1560
1561 /* this makes the hcd giveback() the urb more quickly, by kicking it
1562  * off hardware queues (which may take a while) and returning it as
1563  * soon as practical.  we've already set up the urb's return status,
1564  * but we can't know if the callback completed already.
1565  */
1566 static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1567 {
1568         int             value;
1569
1570         if (is_root_hub(urb->dev))
1571                 value = usb_rh_urb_dequeue(hcd, urb, status);
1572         else {
1573
1574                 /* The only reason an HCD might fail this call is if
1575                  * it has not yet fully queued the urb to begin with.
1576                  * Such failures should be harmless. */
1577                 value = hcd->driver->urb_dequeue(hcd, urb, status);
1578         }
1579         return value;
1580 }
1581
1582 /*
1583  * called in any context
1584  *
1585  * caller guarantees urb won't be recycled till both unlink()
1586  * and the urb's completion function return
1587  */
1588 int usb_hcd_unlink_urb (struct urb *urb, int status)
1589 {
1590         struct usb_hcd          *hcd;
1591         struct usb_device       *udev = urb->dev;
1592         int                     retval = -EIDRM;
1593         unsigned long           flags;
1594
1595         /* Prevent the device and bus from going away while
1596          * the unlink is carried out.  If they are already gone
1597          * then urb->use_count must be 0, since disconnected
1598          * devices can't have any active URBs.
1599          */
1600         spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1601         if (atomic_read(&urb->use_count) > 0) {
1602                 retval = 0;
1603                 usb_get_dev(udev);
1604         }
1605         spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1606         if (retval == 0) {
1607                 hcd = bus_to_hcd(urb->dev->bus);
1608                 retval = unlink1(hcd, urb, status);
1609                 if (retval == 0)
1610                         retval = -EINPROGRESS;
1611                 else if (retval != -EIDRM && retval != -EBUSY)
1612                         dev_dbg(&udev->dev, "hcd_unlink_urb %pK fail %d\n",
1613                                         urb, retval);
1614                 usb_put_dev(udev);
1615         }
1616         return retval;
1617 }
1618
1619 /*-------------------------------------------------------------------------*/
1620
1621 static void __usb_hcd_giveback_urb(struct urb *urb)
1622 {
1623         struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1624         struct usb_anchor *anchor = urb->anchor;
1625         int status = urb->unlinked;
1626
1627         urb->hcpriv = NULL;
1628         if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1629             urb->actual_length < urb->transfer_buffer_length &&
1630             !status))
1631                 status = -EREMOTEIO;
1632
1633         unmap_urb_for_dma(hcd, urb);
1634         usbmon_urb_complete(&hcd->self, urb, status);
1635         usb_anchor_suspend_wakeups(anchor);
1636         usb_unanchor_urb(urb);
1637         if (likely(status == 0))
1638                 usb_led_activity(USB_LED_EVENT_HOST);
1639
1640         /* pass ownership to the completion handler */
1641         urb->status = status;
1642         /*
1643          * This function can be called in task context inside another remote
1644          * coverage collection section, but kcov doesn't support that kind of
1645          * recursion yet. Only collect coverage in softirq context for now.
1646          */
1647         kcov_remote_start_usb_softirq((u64)urb->dev->bus->busnum);
1648         urb->complete(urb);
1649         kcov_remote_stop_softirq();
1650
1651         usb_anchor_resume_wakeups(anchor);
1652         atomic_dec(&urb->use_count);
1653         /*
1654          * Order the write of urb->use_count above before the read
1655          * of urb->reject below.  Pairs with the memory barriers in
1656          * usb_kill_urb() and usb_poison_urb().
1657          */
1658         smp_mb__after_atomic();
1659
1660         if (unlikely(atomic_read(&urb->reject)))
1661                 wake_up(&usb_kill_urb_queue);
1662         usb_put_urb(urb);
1663 }
1664
1665 static void usb_giveback_urb_bh(struct work_struct *work)
1666 {
1667         struct giveback_urb_bh *bh =
1668                 container_of(work, struct giveback_urb_bh, bh);
1669         struct list_head local_list;
1670
1671         spin_lock_irq(&bh->lock);
1672         bh->running = true;
1673         list_replace_init(&bh->head, &local_list);
1674         spin_unlock_irq(&bh->lock);
1675
1676         while (!list_empty(&local_list)) {
1677                 struct urb *urb;
1678
1679                 urb = list_entry(local_list.next, struct urb, urb_list);
1680                 list_del_init(&urb->urb_list);
1681                 bh->completing_ep = urb->ep;
1682                 __usb_hcd_giveback_urb(urb);
1683                 bh->completing_ep = NULL;
1684         }
1685
1686         /*
1687          * giveback new URBs next time to prevent this function
1688          * from not exiting for a long time.
1689          */
1690         spin_lock_irq(&bh->lock);
1691         if (!list_empty(&bh->head)) {
1692                 if (bh->high_prio)
1693                         queue_work(system_bh_highpri_wq, &bh->bh);
1694                 else
1695                         queue_work(system_bh_wq, &bh->bh);
1696         }
1697         bh->running = false;
1698         spin_unlock_irq(&bh->lock);
1699 }
1700
1701 /**
1702  * usb_hcd_giveback_urb - return URB from HCD to device driver
1703  * @hcd: host controller returning the URB
1704  * @urb: urb being returned to the USB device driver.
1705  * @status: completion status code for the URB.
1706  *
1707  * Context: atomic. The completion callback is invoked in caller's context.
1708  * For HCDs with HCD_BH flag set, the completion callback is invoked in BH
1709  * context (except for URBs submitted to the root hub which always complete in
1710  * caller's context).
1711  *
1712  * This hands the URB from HCD to its USB device driver, using its
1713  * completion function.  The HCD has freed all per-urb resources
1714  * (and is done using urb->hcpriv).  It also released all HCD locks;
1715  * the device driver won't cause problems if it frees, modifies,
1716  * or resubmits this URB.
1717  *
1718  * If @urb was unlinked, the value of @status will be overridden by
1719  * @urb->unlinked.  Erroneous short transfers are detected in case
1720  * the HCD hasn't checked for them.
1721  */
1722 void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
1723 {
1724         struct giveback_urb_bh *bh;
1725         bool running;
1726
1727         /* pass status to BH via unlinked */
1728         if (likely(!urb->unlinked))
1729                 urb->unlinked = status;
1730
1731         if (!hcd_giveback_urb_in_bh(hcd) && !is_root_hub(urb->dev)) {
1732                 __usb_hcd_giveback_urb(urb);
1733                 return;
1734         }
1735
1736         if (usb_pipeisoc(urb->pipe) || usb_pipeint(urb->pipe))
1737                 bh = &hcd->high_prio_bh;
1738         else
1739                 bh = &hcd->low_prio_bh;
1740
1741         spin_lock(&bh->lock);
1742         list_add_tail(&urb->urb_list, &bh->head);
1743         running = bh->running;
1744         spin_unlock(&bh->lock);
1745
1746         if (running)
1747                 ;
1748         else if (bh->high_prio)
1749                 queue_work(system_bh_highpri_wq, &bh->bh);
1750         else
1751                 queue_work(system_bh_wq, &bh->bh);
1752 }
1753 EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
1754
1755 /*-------------------------------------------------------------------------*/
1756
1757 /* Cancel all URBs pending on this endpoint and wait for the endpoint's
1758  * queue to drain completely.  The caller must first insure that no more
1759  * URBs can be submitted for this endpoint.
1760  */
1761 void usb_hcd_flush_endpoint(struct usb_device *udev,
1762                 struct usb_host_endpoint *ep)
1763 {
1764         struct usb_hcd          *hcd;
1765         struct urb              *urb;
1766
1767         if (!ep)
1768                 return;
1769         might_sleep();
1770         hcd = bus_to_hcd(udev->bus);
1771
1772         /* No more submits can occur */
1773         spin_lock_irq(&hcd_urb_list_lock);
1774 rescan:
1775         list_for_each_entry_reverse(urb, &ep->urb_list, urb_list) {
1776                 int     is_in;
1777
1778                 if (urb->unlinked)
1779                         continue;
1780                 usb_get_urb (urb);
1781                 is_in = usb_urb_dir_in(urb);
1782                 spin_unlock(&hcd_urb_list_lock);
1783
1784                 /* kick hcd */
1785                 unlink1(hcd, urb, -ESHUTDOWN);
1786                 dev_dbg (hcd->self.controller,
1787                         "shutdown urb %pK ep%d%s-%s\n",
1788                         urb, usb_endpoint_num(&ep->desc),
1789                         is_in ? "in" : "out",
1790                         usb_ep_type_string(usb_endpoint_type(&ep->desc)));
1791                 usb_put_urb (urb);
1792
1793                 /* list contents may have changed */
1794                 spin_lock(&hcd_urb_list_lock);
1795                 goto rescan;
1796         }
1797         spin_unlock_irq(&hcd_urb_list_lock);
1798
1799         /* Wait until the endpoint queue is completely empty */
1800         while (!list_empty (&ep->urb_list)) {
1801                 spin_lock_irq(&hcd_urb_list_lock);
1802
1803                 /* The list may have changed while we acquired the spinlock */
1804                 urb = NULL;
1805                 if (!list_empty (&ep->urb_list)) {
1806                         urb = list_entry (ep->urb_list.prev, struct urb,
1807                                         urb_list);
1808                         usb_get_urb (urb);
1809                 }
1810                 spin_unlock_irq(&hcd_urb_list_lock);
1811
1812                 if (urb) {
1813                         usb_kill_urb (urb);
1814                         usb_put_urb (urb);
1815                 }
1816         }
1817 }
1818
1819 /**
1820  * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1821  *                              the bus bandwidth
1822  * @udev: target &usb_device
1823  * @new_config: new configuration to install
1824  * @cur_alt: the current alternate interface setting
1825  * @new_alt: alternate interface setting that is being installed
1826  *
1827  * To change configurations, pass in the new configuration in new_config,
1828  * and pass NULL for cur_alt and new_alt.
1829  *
1830  * To reset a device's configuration (put the device in the ADDRESSED state),
1831  * pass in NULL for new_config, cur_alt, and new_alt.
1832  *
1833  * To change alternate interface settings, pass in NULL for new_config,
1834  * pass in the current alternate interface setting in cur_alt,
1835  * and pass in the new alternate interface setting in new_alt.
1836  *
1837  * Return: An error if the requested bandwidth change exceeds the
1838  * bus bandwidth or host controller internal resources.
1839  */
1840 int usb_hcd_alloc_bandwidth(struct usb_device *udev,
1841                 struct usb_host_config *new_config,
1842                 struct usb_host_interface *cur_alt,
1843                 struct usb_host_interface *new_alt)
1844 {
1845         int num_intfs, i, j;
1846         struct usb_host_interface *alt = NULL;
1847         int ret = 0;
1848         struct usb_hcd *hcd;
1849         struct usb_host_endpoint *ep;
1850
1851         hcd = bus_to_hcd(udev->bus);
1852         if (!hcd->driver->check_bandwidth)
1853                 return 0;
1854
1855         /* Configuration is being removed - set configuration 0 */
1856         if (!new_config && !cur_alt) {
1857                 for (i = 1; i < 16; ++i) {
1858                         ep = udev->ep_out[i];
1859                         if (ep)
1860                                 hcd->driver->drop_endpoint(hcd, udev, ep);
1861                         ep = udev->ep_in[i];
1862                         if (ep)
1863                                 hcd->driver->drop_endpoint(hcd, udev, ep);
1864                 }
1865                 hcd->driver->check_bandwidth(hcd, udev);
1866                 return 0;
1867         }
1868         /* Check if the HCD says there's enough bandwidth.  Enable all endpoints
1869          * each interface's alt setting 0 and ask the HCD to check the bandwidth
1870          * of the bus.  There will always be bandwidth for endpoint 0, so it's
1871          * ok to exclude it.
1872          */
1873         if (new_config) {
1874                 num_intfs = new_config->desc.bNumInterfaces;
1875                 /* Remove endpoints (except endpoint 0, which is always on the
1876                  * schedule) from the old config from the schedule
1877                  */
1878                 for (i = 1; i < 16; ++i) {
1879                         ep = udev->ep_out[i];
1880                         if (ep) {
1881                                 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1882                                 if (ret < 0)
1883                                         goto reset;
1884                         }
1885                         ep = udev->ep_in[i];
1886                         if (ep) {
1887                                 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1888                                 if (ret < 0)
1889                                         goto reset;
1890                         }
1891                 }
1892                 for (i = 0; i < num_intfs; ++i) {
1893                         struct usb_host_interface *first_alt;
1894                         int iface_num;
1895
1896                         first_alt = &new_config->intf_cache[i]->altsetting[0];
1897                         iface_num = first_alt->desc.bInterfaceNumber;
1898                         /* Set up endpoints for alternate interface setting 0 */
1899                         alt = usb_find_alt_setting(new_config, iface_num, 0);
1900                         if (!alt)
1901                                 /* No alt setting 0? Pick the first setting. */
1902                                 alt = first_alt;
1903
1904                         for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1905                                 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1906                                 if (ret < 0)
1907                                         goto reset;
1908                         }
1909                 }
1910         }
1911         if (cur_alt && new_alt) {
1912                 struct usb_interface *iface = usb_ifnum_to_if(udev,
1913                                 cur_alt->desc.bInterfaceNumber);
1914
1915                 if (!iface)
1916                         return -EINVAL;
1917                 if (iface->resetting_device) {
1918                         /*
1919                          * The USB core just reset the device, so the xHCI host
1920                          * and the device will think alt setting 0 is installed.
1921                          * However, the USB core will pass in the alternate
1922                          * setting installed before the reset as cur_alt.  Dig
1923                          * out the alternate setting 0 structure, or the first
1924                          * alternate setting if a broken device doesn't have alt
1925                          * setting 0.
1926                          */
1927                         cur_alt = usb_altnum_to_altsetting(iface, 0);
1928                         if (!cur_alt)
1929                                 cur_alt = &iface->altsetting[0];
1930                 }
1931
1932                 /* Drop all the endpoints in the current alt setting */
1933                 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1934                         ret = hcd->driver->drop_endpoint(hcd, udev,
1935                                         &cur_alt->endpoint[i]);
1936                         if (ret < 0)
1937                                 goto reset;
1938                 }
1939                 /* Add all the endpoints in the new alt setting */
1940                 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1941                         ret = hcd->driver->add_endpoint(hcd, udev,
1942                                         &new_alt->endpoint[i]);
1943                         if (ret < 0)
1944                                 goto reset;
1945                 }
1946         }
1947         ret = hcd->driver->check_bandwidth(hcd, udev);
1948 reset:
1949         if (ret < 0)
1950                 hcd->driver->reset_bandwidth(hcd, udev);
1951         return ret;
1952 }
1953
1954 /* Disables the endpoint: synchronizes with the hcd to make sure all
1955  * endpoint state is gone from hardware.  usb_hcd_flush_endpoint() must
1956  * have been called previously.  Use for set_configuration, set_interface,
1957  * driver removal, physical disconnect.
1958  *
1959  * example:  a qh stored in ep->hcpriv, holding state related to endpoint
1960  * type, maxpacket size, toggle, halt status, and scheduling.
1961  */
1962 void usb_hcd_disable_endpoint(struct usb_device *udev,
1963                 struct usb_host_endpoint *ep)
1964 {
1965         struct usb_hcd          *hcd;
1966
1967         might_sleep();
1968         hcd = bus_to_hcd(udev->bus);
1969         if (hcd->driver->endpoint_disable)
1970                 hcd->driver->endpoint_disable(hcd, ep);
1971 }
1972
1973 /**
1974  * usb_hcd_reset_endpoint - reset host endpoint state
1975  * @udev: USB device.
1976  * @ep:   the endpoint to reset.
1977  *
1978  * Resets any host endpoint state such as the toggle bit, sequence
1979  * number and current window.
1980  */
1981 void usb_hcd_reset_endpoint(struct usb_device *udev,
1982                             struct usb_host_endpoint *ep)
1983 {
1984         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1985
1986         if (hcd->driver->endpoint_reset)
1987                 hcd->driver->endpoint_reset(hcd, ep);
1988         else {
1989                 int epnum = usb_endpoint_num(&ep->desc);
1990                 int is_out = usb_endpoint_dir_out(&ep->desc);
1991                 int is_control = usb_endpoint_xfer_control(&ep->desc);
1992
1993                 usb_settoggle(udev, epnum, is_out, 0);
1994                 if (is_control)
1995                         usb_settoggle(udev, epnum, !is_out, 0);
1996         }
1997 }
1998
1999 /**
2000  * usb_alloc_streams - allocate bulk endpoint stream IDs.
2001  * @interface:          alternate setting that includes all endpoints.
2002  * @eps:                array of endpoints that need streams.
2003  * @num_eps:            number of endpoints in the array.
2004  * @num_streams:        number of streams to allocate.
2005  * @mem_flags:          flags hcd should use to allocate memory.
2006  *
2007  * Sets up a group of bulk endpoints to have @num_streams stream IDs available.
2008  * Drivers may queue multiple transfers to different stream IDs, which may
2009  * complete in a different order than they were queued.
2010  *
2011  * Return: On success, the number of allocated streams. On failure, a negative
2012  * error code.
2013  */
2014 int usb_alloc_streams(struct usb_interface *interface,
2015                 struct usb_host_endpoint **eps, unsigned int num_eps,
2016                 unsigned int num_streams, gfp_t mem_flags)
2017 {
2018         struct usb_hcd *hcd;
2019         struct usb_device *dev;
2020         int i, ret;
2021
2022         dev = interface_to_usbdev(interface);
2023         hcd = bus_to_hcd(dev->bus);
2024         if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
2025                 return -EINVAL;
2026         if (dev->speed < USB_SPEED_SUPER)
2027                 return -EINVAL;
2028         if (dev->state < USB_STATE_CONFIGURED)
2029                 return -ENODEV;
2030
2031         for (i = 0; i < num_eps; i++) {
2032                 /* Streams only apply to bulk endpoints. */
2033                 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
2034                         return -EINVAL;
2035                 /* Re-alloc is not allowed */
2036                 if (eps[i]->streams)
2037                         return -EINVAL;
2038         }
2039
2040         ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
2041                         num_streams, mem_flags);
2042         if (ret < 0)
2043                 return ret;
2044
2045         for (i = 0; i < num_eps; i++)
2046                 eps[i]->streams = ret;
2047
2048         return ret;
2049 }
2050 EXPORT_SYMBOL_GPL(usb_alloc_streams);
2051
2052 /**
2053  * usb_free_streams - free bulk endpoint stream IDs.
2054  * @interface:  alternate setting that includes all endpoints.
2055  * @eps:        array of endpoints to remove streams from.
2056  * @num_eps:    number of endpoints in the array.
2057  * @mem_flags:  flags hcd should use to allocate memory.
2058  *
2059  * Reverts a group of bulk endpoints back to not using stream IDs.
2060  * Can fail if we are given bad arguments, or HCD is broken.
2061  *
2062  * Return: 0 on success. On failure, a negative error code.
2063  */
2064 int usb_free_streams(struct usb_interface *interface,
2065                 struct usb_host_endpoint **eps, unsigned int num_eps,
2066                 gfp_t mem_flags)
2067 {
2068         struct usb_hcd *hcd;
2069         struct usb_device *dev;
2070         int i, ret;
2071
2072         dev = interface_to_usbdev(interface);
2073         hcd = bus_to_hcd(dev->bus);
2074         if (dev->speed < USB_SPEED_SUPER)
2075                 return -EINVAL;
2076
2077         /* Double-free is not allowed */
2078         for (i = 0; i < num_eps; i++)
2079                 if (!eps[i] || !eps[i]->streams)
2080                         return -EINVAL;
2081
2082         ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
2083         if (ret < 0)
2084                 return ret;
2085
2086         for (i = 0; i < num_eps; i++)
2087                 eps[i]->streams = 0;
2088
2089         return ret;
2090 }
2091 EXPORT_SYMBOL_GPL(usb_free_streams);
2092
2093 /* Protect against drivers that try to unlink URBs after the device
2094  * is gone, by waiting until all unlinks for @udev are finished.
2095  * Since we don't currently track URBs by device, simply wait until
2096  * nothing is running in the locked region of usb_hcd_unlink_urb().
2097  */
2098 void usb_hcd_synchronize_unlinks(struct usb_device *udev)
2099 {
2100         spin_lock_irq(&hcd_urb_unlink_lock);
2101         spin_unlock_irq(&hcd_urb_unlink_lock);
2102 }
2103
2104 /*-------------------------------------------------------------------------*/
2105
2106 /* called in any context */
2107 int usb_hcd_get_frame_number (struct usb_device *udev)
2108 {
2109         struct usb_hcd  *hcd = bus_to_hcd(udev->bus);
2110
2111         if (!HCD_RH_RUNNING(hcd))
2112                 return -ESHUTDOWN;
2113         return hcd->driver->get_frame_number (hcd);
2114 }
2115
2116 /*-------------------------------------------------------------------------*/
2117 #ifdef CONFIG_USB_HCD_TEST_MODE
2118
2119 static void usb_ehset_completion(struct urb *urb)
2120 {
2121         struct completion  *done = urb->context;
2122
2123         complete(done);
2124 }
2125 /*
2126  * Allocate and initialize a control URB. This request will be used by the
2127  * EHSET SINGLE_STEP_SET_FEATURE test in which the DATA and STATUS stages
2128  * of the GetDescriptor request are sent 15 seconds after the SETUP stage.
2129  * Return NULL if failed.
2130  */
2131 static struct urb *request_single_step_set_feature_urb(
2132         struct usb_device       *udev,
2133         void                    *dr,
2134         void                    *buf,
2135         struct completion       *done)
2136 {
2137         struct urb *urb;
2138         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2139
2140         urb = usb_alloc_urb(0, GFP_KERNEL);
2141         if (!urb)
2142                 return NULL;
2143
2144         urb->pipe = usb_rcvctrlpipe(udev, 0);
2145
2146         urb->ep = &udev->ep0;
2147         urb->dev = udev;
2148         urb->setup_packet = (void *)dr;
2149         urb->transfer_buffer = buf;
2150         urb->transfer_buffer_length = USB_DT_DEVICE_SIZE;
2151         urb->complete = usb_ehset_completion;
2152         urb->status = -EINPROGRESS;
2153         urb->actual_length = 0;
2154         urb->transfer_flags = URB_DIR_IN;
2155         usb_get_urb(urb);
2156         atomic_inc(&urb->use_count);
2157         atomic_inc(&urb->dev->urbnum);
2158         if (map_urb_for_dma(hcd, urb, GFP_KERNEL)) {
2159                 usb_put_urb(urb);
2160                 usb_free_urb(urb);
2161                 return NULL;
2162         }
2163
2164         urb->context = done;
2165         return urb;
2166 }
2167
2168 int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
2169 {
2170         int retval = -ENOMEM;
2171         struct usb_ctrlrequest *dr;
2172         struct urb *urb;
2173         struct usb_device *udev;
2174         struct usb_device_descriptor *buf;
2175         DECLARE_COMPLETION_ONSTACK(done);
2176
2177         /* Obtain udev of the rhub's child port */
2178         udev = usb_hub_find_child(hcd->self.root_hub, port);
2179         if (!udev) {
2180                 dev_err(hcd->self.controller, "No device attached to the RootHub\n");
2181                 return -ENODEV;
2182         }
2183         buf = kmalloc(USB_DT_DEVICE_SIZE, GFP_KERNEL);
2184         if (!buf)
2185                 return -ENOMEM;
2186
2187         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2188         if (!dr) {
2189                 kfree(buf);
2190                 return -ENOMEM;
2191         }
2192
2193         /* Fill Setup packet for GetDescriptor */
2194         dr->bRequestType = USB_DIR_IN;
2195         dr->bRequest = USB_REQ_GET_DESCRIPTOR;
2196         dr->wValue = cpu_to_le16(USB_DT_DEVICE << 8);
2197         dr->wIndex = 0;
2198         dr->wLength = cpu_to_le16(USB_DT_DEVICE_SIZE);
2199         urb = request_single_step_set_feature_urb(udev, dr, buf, &done);
2200         if (!urb)
2201                 goto cleanup;
2202
2203         /* Submit just the SETUP stage */
2204         retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 1);
2205         if (retval)
2206                 goto out1;
2207         if (!wait_for_completion_timeout(&done, msecs_to_jiffies(2000))) {
2208                 usb_kill_urb(urb);
2209                 retval = -ETIMEDOUT;
2210                 dev_err(hcd->self.controller,
2211                         "%s SETUP stage timed out on ep0\n", __func__);
2212                 goto out1;
2213         }
2214         msleep(15 * 1000);
2215
2216         /* Complete remaining DATA and STATUS stages using the same URB */
2217         urb->status = -EINPROGRESS;
2218         usb_get_urb(urb);
2219         atomic_inc(&urb->use_count);
2220         atomic_inc(&urb->dev->urbnum);
2221         retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 0);
2222         if (!retval && !wait_for_completion_timeout(&done,
2223                                                 msecs_to_jiffies(2000))) {
2224                 usb_kill_urb(urb);
2225                 retval = -ETIMEDOUT;
2226                 dev_err(hcd->self.controller,
2227                         "%s IN stage timed out on ep0\n", __func__);
2228         }
2229 out1:
2230         usb_free_urb(urb);
2231 cleanup:
2232         kfree(dr);
2233         kfree(buf);
2234         return retval;
2235 }
2236 EXPORT_SYMBOL_GPL(ehset_single_step_set_feature);
2237 #endif /* CONFIG_USB_HCD_TEST_MODE */
2238
2239 /*-------------------------------------------------------------------------*/
2240
2241 #ifdef  CONFIG_PM
2242
2243 int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
2244 {
2245         struct usb_hcd  *hcd = bus_to_hcd(rhdev->bus);
2246         int             status;
2247         int             old_state = hcd->state;
2248
2249         dev_dbg(&rhdev->dev, "bus %ssuspend, wakeup %d\n",
2250                         (PMSG_IS_AUTO(msg) ? "auto-" : ""),
2251                         rhdev->do_remote_wakeup);
2252         if (HCD_DEAD(hcd)) {
2253                 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "suspend");
2254                 return 0;
2255         }
2256
2257         if (!hcd->driver->bus_suspend) {
2258                 status = -ENOENT;
2259         } else {
2260                 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2261                 hcd->state = HC_STATE_QUIESCING;
2262                 status = hcd->driver->bus_suspend(hcd);
2263         }
2264         if (status == 0) {
2265                 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
2266                 hcd->state = HC_STATE_SUSPENDED;
2267
2268                 if (!PMSG_IS_AUTO(msg))
2269                         usb_phy_roothub_suspend(hcd->self.sysdev,
2270                                                 hcd->phy_roothub);
2271
2272                 /* Did we race with a root-hub wakeup event? */
2273                 if (rhdev->do_remote_wakeup) {
2274                         char    buffer[6];
2275
2276                         status = hcd->driver->hub_status_data(hcd, buffer);
2277                         if (status != 0) {
2278                                 dev_dbg(&rhdev->dev, "suspend raced with wakeup event\n");
2279                                 hcd_bus_resume(rhdev, PMSG_AUTO_RESUME);
2280                                 status = -EBUSY;
2281                         }
2282                 }
2283         } else {
2284                 spin_lock_irq(&hcd_root_hub_lock);
2285                 if (!HCD_DEAD(hcd)) {
2286                         set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2287                         hcd->state = old_state;
2288                 }
2289                 spin_unlock_irq(&hcd_root_hub_lock);
2290                 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
2291                                 "suspend", status);
2292         }
2293         return status;
2294 }
2295
2296 int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
2297 {
2298         struct usb_hcd  *hcd = bus_to_hcd(rhdev->bus);
2299         int             status;
2300         int             old_state = hcd->state;
2301
2302         dev_dbg(&rhdev->dev, "usb %sresume\n",
2303                         (PMSG_IS_AUTO(msg) ? "auto-" : ""));
2304         if (HCD_DEAD(hcd)) {
2305                 dev_dbg(&rhdev->dev, "skipped %s of dead bus\n", "resume");
2306                 return 0;
2307         }
2308
2309         if (!PMSG_IS_AUTO(msg)) {
2310                 status = usb_phy_roothub_resume(hcd->self.sysdev,
2311                                                 hcd->phy_roothub);
2312                 if (status)
2313                         return status;
2314         }
2315
2316         if (!hcd->driver->bus_resume)
2317                 return -ENOENT;
2318         if (HCD_RH_RUNNING(hcd))
2319                 return 0;
2320
2321         hcd->state = HC_STATE_RESUMING;
2322         status = hcd->driver->bus_resume(hcd);
2323         clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2324         if (status == 0)
2325                 status = usb_phy_roothub_calibrate(hcd->phy_roothub);
2326
2327         if (status == 0) {
2328                 struct usb_device *udev;
2329                 int port1;
2330
2331                 spin_lock_irq(&hcd_root_hub_lock);
2332                 if (!HCD_DEAD(hcd)) {
2333                         usb_set_device_state(rhdev, rhdev->actconfig
2334                                         ? USB_STATE_CONFIGURED
2335                                         : USB_STATE_ADDRESS);
2336                         set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2337                         hcd->state = HC_STATE_RUNNING;
2338                 }
2339                 spin_unlock_irq(&hcd_root_hub_lock);
2340
2341                 /*
2342                  * Check whether any of the enabled ports on the root hub are
2343                  * unsuspended.  If they are then a TRSMRCY delay is needed
2344                  * (this is what the USB-2 spec calls a "global resume").
2345                  * Otherwise we can skip the delay.
2346                  */
2347                 usb_hub_for_each_child(rhdev, port1, udev) {
2348                         if (udev->state != USB_STATE_NOTATTACHED &&
2349                                         !udev->port_is_suspended) {
2350                                 usleep_range(10000, 11000);     /* TRSMRCY */
2351                                 break;
2352                         }
2353                 }
2354         } else {
2355                 hcd->state = old_state;
2356                 usb_phy_roothub_suspend(hcd->self.sysdev, hcd->phy_roothub);
2357                 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
2358                                 "resume", status);
2359                 if (status != -ESHUTDOWN)
2360                         usb_hc_died(hcd);
2361         }
2362         return status;
2363 }
2364
2365 /* Workqueue routine for root-hub remote wakeup */
2366 static void hcd_resume_work(struct work_struct *work)
2367 {
2368         struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
2369         struct usb_device *udev = hcd->self.root_hub;
2370
2371         usb_remote_wakeup(udev);
2372 }
2373
2374 /**
2375  * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2376  * @hcd: host controller for this root hub
2377  *
2378  * The USB host controller calls this function when its root hub is
2379  * suspended (with the remote wakeup feature enabled) and a remote
2380  * wakeup request is received.  The routine submits a workqueue request
2381  * to resume the root hub (that is, manage its downstream ports again).
2382  */
2383 void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2384 {
2385         unsigned long flags;
2386
2387         spin_lock_irqsave (&hcd_root_hub_lock, flags);
2388         if (hcd->rh_registered) {
2389                 pm_wakeup_event(&hcd->self.root_hub->dev, 0);
2390                 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2391                 queue_work(pm_wq, &hcd->wakeup_work);
2392         }
2393         spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2394 }
2395 EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
2396
2397 #endif  /* CONFIG_PM */
2398
2399 /*-------------------------------------------------------------------------*/
2400
2401 #ifdef  CONFIG_USB_OTG
2402
2403 /**
2404  * usb_bus_start_enum - start immediate enumeration (for OTG)
2405  * @bus: the bus (must use hcd framework)
2406  * @port_num: 1-based number of port; usually bus->otg_port
2407  * Context: atomic
2408  *
2409  * Starts enumeration, with an immediate reset followed later by
2410  * hub_wq identifying and possibly configuring the device.
2411  * This is needed by OTG controller drivers, where it helps meet
2412  * HNP protocol timing requirements for starting a port reset.
2413  *
2414  * Return: 0 if successful.
2415  */
2416 int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2417 {
2418         struct usb_hcd          *hcd;
2419         int                     status = -EOPNOTSUPP;
2420
2421         /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2422          * boards with root hubs hooked up to internal devices (instead of
2423          * just the OTG port) may need more attention to resetting...
2424          */
2425         hcd = bus_to_hcd(bus);
2426         if (port_num && hcd->driver->start_port_reset)
2427                 status = hcd->driver->start_port_reset(hcd, port_num);
2428
2429         /* allocate hub_wq shortly after (first) root port reset finishes;
2430          * it may issue others, until at least 50 msecs have passed.
2431          */
2432         if (status == 0)
2433                 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2434         return status;
2435 }
2436 EXPORT_SYMBOL_GPL(usb_bus_start_enum);
2437
2438 #endif
2439
2440 /*-------------------------------------------------------------------------*/
2441
2442 /**
2443  * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2444  * @irq: the IRQ being raised
2445  * @__hcd: pointer to the HCD whose IRQ is being signaled
2446  *
2447  * If the controller isn't HALTed, calls the driver's irq handler.
2448  * Checks whether the controller is now dead.
2449  *
2450  * Return: %IRQ_HANDLED if the IRQ was handled. %IRQ_NONE otherwise.
2451  */
2452 irqreturn_t usb_hcd_irq (int irq, void *__hcd)
2453 {
2454         struct usb_hcd          *hcd = __hcd;
2455         irqreturn_t             rc;
2456
2457         if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
2458                 rc = IRQ_NONE;
2459         else if (hcd->driver->irq(hcd) == IRQ_NONE)
2460                 rc = IRQ_NONE;
2461         else
2462                 rc = IRQ_HANDLED;
2463
2464         return rc;
2465 }
2466 EXPORT_SYMBOL_GPL(usb_hcd_irq);
2467
2468 /*-------------------------------------------------------------------------*/
2469
2470 /* Workqueue routine for when the root-hub has died. */
2471 static void hcd_died_work(struct work_struct *work)
2472 {
2473         struct usb_hcd *hcd = container_of(work, struct usb_hcd, died_work);
2474         static char *env[] = {
2475                 "ERROR=DEAD",
2476                 NULL
2477         };
2478
2479         /* Notify user space that the host controller has died */
2480         kobject_uevent_env(&hcd->self.root_hub->dev.kobj, KOBJ_OFFLINE, env);
2481 }
2482
2483 /**
2484  * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2485  * @hcd: pointer to the HCD representing the controller
2486  *
2487  * This is called by bus glue to report a USB host controller that died
2488  * while operations may still have been pending.  It's called automatically
2489  * by the PCI glue, so only glue for non-PCI busses should need to call it.
2490  *
2491  * Only call this function with the primary HCD.
2492  */
2493 void usb_hc_died (struct usb_hcd *hcd)
2494 {
2495         unsigned long flags;
2496
2497         dev_err (hcd->self.controller, "HC died; cleaning up\n");
2498
2499         spin_lock_irqsave (&hcd_root_hub_lock, flags);
2500         clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2501         set_bit(HCD_FLAG_DEAD, &hcd->flags);
2502         if (hcd->rh_registered) {
2503                 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2504
2505                 /* make hub_wq clean up old urbs and devices */
2506                 usb_set_device_state (hcd->self.root_hub,
2507                                 USB_STATE_NOTATTACHED);
2508                 usb_kick_hub_wq(hcd->self.root_hub);
2509         }
2510         if (usb_hcd_is_primary_hcd(hcd) && hcd->shared_hcd) {
2511                 hcd = hcd->shared_hcd;
2512                 clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2513                 set_bit(HCD_FLAG_DEAD, &hcd->flags);
2514                 if (hcd->rh_registered) {
2515                         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2516
2517                         /* make hub_wq clean up old urbs and devices */
2518                         usb_set_device_state(hcd->self.root_hub,
2519                                         USB_STATE_NOTATTACHED);
2520                         usb_kick_hub_wq(hcd->self.root_hub);
2521                 }
2522         }
2523
2524         /* Handle the case where this function gets called with a shared HCD */
2525         if (usb_hcd_is_primary_hcd(hcd))
2526                 schedule_work(&hcd->died_work);
2527         else
2528                 schedule_work(&hcd->primary_hcd->died_work);
2529
2530         spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2531         /* Make sure that the other roothub is also deallocated. */
2532 }
2533 EXPORT_SYMBOL_GPL (usb_hc_died);
2534
2535 /*-------------------------------------------------------------------------*/
2536
2537 static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
2538 {
2539
2540         spin_lock_init(&bh->lock);
2541         INIT_LIST_HEAD(&bh->head);
2542         INIT_WORK(&bh->bh, usb_giveback_urb_bh);
2543 }
2544
2545 struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
2546                 struct device *sysdev, struct device *dev, const char *bus_name,
2547                 struct usb_hcd *primary_hcd)
2548 {
2549         struct usb_hcd *hcd;
2550
2551         hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
2552         if (!hcd)
2553                 return NULL;
2554         if (primary_hcd == NULL) {
2555                 hcd->address0_mutex = kmalloc(sizeof(*hcd->address0_mutex),
2556                                 GFP_KERNEL);
2557                 if (!hcd->address0_mutex) {
2558                         kfree(hcd);
2559                         dev_dbg(dev, "hcd address0 mutex alloc failed\n");
2560                         return NULL;
2561                 }
2562                 mutex_init(hcd->address0_mutex);
2563                 hcd->bandwidth_mutex = kmalloc(sizeof(*hcd->bandwidth_mutex),
2564                                 GFP_KERNEL);
2565                 if (!hcd->bandwidth_mutex) {
2566                         kfree(hcd->address0_mutex);
2567                         kfree(hcd);
2568                         dev_dbg(dev, "hcd bandwidth mutex alloc failed\n");
2569                         return NULL;
2570                 }
2571                 mutex_init(hcd->bandwidth_mutex);
2572                 dev_set_drvdata(dev, hcd);
2573         } else {
2574                 mutex_lock(&usb_port_peer_mutex);
2575                 hcd->address0_mutex = primary_hcd->address0_mutex;
2576                 hcd->bandwidth_mutex = primary_hcd->bandwidth_mutex;
2577                 hcd->primary_hcd = primary_hcd;
2578                 primary_hcd->primary_hcd = primary_hcd;
2579                 hcd->shared_hcd = primary_hcd;
2580                 primary_hcd->shared_hcd = hcd;
2581                 mutex_unlock(&usb_port_peer_mutex);
2582         }
2583
2584         kref_init(&hcd->kref);
2585
2586         usb_bus_init(&hcd->self);
2587         hcd->self.controller = dev;
2588         hcd->self.sysdev = sysdev;
2589         hcd->self.bus_name = bus_name;
2590
2591         timer_setup(&hcd->rh_timer, rh_timer_func, 0);
2592 #ifdef CONFIG_PM
2593         INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2594 #endif
2595
2596         INIT_WORK(&hcd->died_work, hcd_died_work);
2597
2598         hcd->driver = driver;
2599         hcd->speed = driver->flags & HCD_MASK;
2600         hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2601                         "USB Host Controller";
2602         return hcd;
2603 }
2604 EXPORT_SYMBOL_GPL(__usb_create_hcd);
2605
2606 /**
2607  * usb_create_shared_hcd - create and initialize an HCD structure
2608  * @driver: HC driver that will use this hcd
2609  * @dev: device for this HC, stored in hcd->self.controller
2610  * @bus_name: value to store in hcd->self.bus_name
2611  * @primary_hcd: a pointer to the usb_hcd structure that is sharing the
2612  *              PCI device.  Only allocate certain resources for the primary HCD
2613  *
2614  * Context: task context, might sleep.
2615  *
2616  * Allocate a struct usb_hcd, with extra space at the end for the
2617  * HC driver's private data.  Initialize the generic members of the
2618  * hcd structure.
2619  *
2620  * Return: On success, a pointer to the created and initialized HCD structure.
2621  * On failure (e.g. if memory is unavailable), %NULL.
2622  */
2623 struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
2624                 struct device *dev, const char *bus_name,
2625                 struct usb_hcd *primary_hcd)
2626 {
2627         return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
2628 }
2629 EXPORT_SYMBOL_GPL(usb_create_shared_hcd);
2630
2631 /**
2632  * usb_create_hcd - create and initialize an HCD structure
2633  * @driver: HC driver that will use this hcd
2634  * @dev: device for this HC, stored in hcd->self.controller
2635  * @bus_name: value to store in hcd->self.bus_name
2636  *
2637  * Context: task context, might sleep.
2638  *
2639  * Allocate a struct usb_hcd, with extra space at the end for the
2640  * HC driver's private data.  Initialize the generic members of the
2641  * hcd structure.
2642  *
2643  * Return: On success, a pointer to the created and initialized HCD
2644  * structure. On failure (e.g. if memory is unavailable), %NULL.
2645  */
2646 struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
2647                 struct device *dev, const char *bus_name)
2648 {
2649         return __usb_create_hcd(driver, dev, dev, bus_name, NULL);
2650 }
2651 EXPORT_SYMBOL_GPL(usb_create_hcd);
2652
2653 /*
2654  * Roothubs that share one PCI device must also share the bandwidth mutex.
2655  * Don't deallocate the bandwidth_mutex until the last shared usb_hcd is
2656  * deallocated.
2657  *
2658  * Make sure to deallocate the bandwidth_mutex only when the last HCD is
2659  * freed.  When hcd_release() is called for either hcd in a peer set,
2660  * invalidate the peer's ->shared_hcd and ->primary_hcd pointers.
2661  */
2662 static void hcd_release(struct kref *kref)
2663 {
2664         struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2665
2666         mutex_lock(&usb_port_peer_mutex);
2667         if (hcd->shared_hcd) {
2668                 struct usb_hcd *peer = hcd->shared_hcd;
2669
2670                 peer->shared_hcd = NULL;
2671                 peer->primary_hcd = NULL;
2672         } else {
2673                 kfree(hcd->address0_mutex);
2674                 kfree(hcd->bandwidth_mutex);
2675         }
2676         mutex_unlock(&usb_port_peer_mutex);
2677         kfree(hcd);
2678 }
2679
2680 struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2681 {
2682         if (hcd)
2683                 kref_get (&hcd->kref);
2684         return hcd;
2685 }
2686 EXPORT_SYMBOL_GPL(usb_get_hcd);
2687
2688 void usb_put_hcd (struct usb_hcd *hcd)
2689 {
2690         if (hcd)
2691                 kref_put (&hcd->kref, hcd_release);
2692 }
2693 EXPORT_SYMBOL_GPL(usb_put_hcd);
2694
2695 int usb_hcd_is_primary_hcd(struct usb_hcd *hcd)
2696 {
2697         if (!hcd->primary_hcd)
2698                 return 1;
2699         return hcd == hcd->primary_hcd;
2700 }
2701 EXPORT_SYMBOL_GPL(usb_hcd_is_primary_hcd);
2702
2703 int usb_hcd_find_raw_port_number(struct usb_hcd *hcd, int port1)
2704 {
2705         if (!hcd->driver->find_raw_port_number)
2706                 return port1;
2707
2708         return hcd->driver->find_raw_port_number(hcd, port1);
2709 }
2710
2711 static int usb_hcd_request_irqs(struct usb_hcd *hcd,
2712                 unsigned int irqnum, unsigned long irqflags)
2713 {
2714         int retval;
2715
2716         if (hcd->driver->irq) {
2717
2718                 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2719                                 hcd->driver->description, hcd->self.busnum);
2720                 retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2721                                 hcd->irq_descr, hcd);
2722                 if (retval != 0) {
2723                         dev_err(hcd->self.controller,
2724                                         "request interrupt %d failed\n",
2725                                         irqnum);
2726                         return retval;
2727                 }
2728                 hcd->irq = irqnum;
2729                 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2730                                 (hcd->driver->flags & HCD_MEMORY) ?
2731                                         "io mem" : "io port",
2732                                 (unsigned long long)hcd->rsrc_start);
2733         } else {
2734                 hcd->irq = 0;
2735                 if (hcd->rsrc_start)
2736                         dev_info(hcd->self.controller, "%s 0x%08llx\n",
2737                                         (hcd->driver->flags & HCD_MEMORY) ?
2738                                                 "io mem" : "io port",
2739                                         (unsigned long long)hcd->rsrc_start);
2740         }
2741         return 0;
2742 }
2743
2744 /*
2745  * Before we free this root hub, flush in-flight peering attempts
2746  * and disable peer lookups
2747  */
2748 static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
2749 {
2750         struct usb_device *rhdev;
2751
2752         mutex_lock(&usb_port_peer_mutex);
2753         rhdev = hcd->self.root_hub;
2754         hcd->self.root_hub = NULL;
2755         mutex_unlock(&usb_port_peer_mutex);
2756         usb_put_dev(rhdev);
2757 }
2758
2759 /**
2760  * usb_stop_hcd - Halt the HCD
2761  * @hcd: the usb_hcd that has to be halted
2762  *
2763  * Stop the root-hub polling timer and invoke the HCD's ->stop callback.
2764  */
2765 static void usb_stop_hcd(struct usb_hcd *hcd)
2766 {
2767         hcd->rh_pollable = 0;
2768         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2769         del_timer_sync(&hcd->rh_timer);
2770
2771         hcd->driver->stop(hcd);
2772         hcd->state = HC_STATE_HALT;
2773
2774         /* In case the HCD restarted the timer, stop it again. */
2775         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2776         del_timer_sync(&hcd->rh_timer);
2777 }
2778
2779 /**
2780  * usb_add_hcd - finish generic HCD structure initialization and register
2781  * @hcd: the usb_hcd structure to initialize
2782  * @irqnum: Interrupt line to allocate
2783  * @irqflags: Interrupt type flags
2784  *
2785  * Finish the remaining parts of generic HCD initialization: allocate the
2786  * buffers of consistent memory, register the bus, request the IRQ line,
2787  * and call the driver's reset() and start() routines.
2788  */
2789 int usb_add_hcd(struct usb_hcd *hcd,
2790                 unsigned int irqnum, unsigned long irqflags)
2791 {
2792         int retval;
2793         struct usb_device *rhdev;
2794         struct usb_hcd *shared_hcd;
2795
2796         if (!hcd->skip_phy_initialization) {
2797                 if (usb_hcd_is_primary_hcd(hcd)) {
2798                         hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
2799                         if (IS_ERR(hcd->phy_roothub))
2800                                 return PTR_ERR(hcd->phy_roothub);
2801                 } else {
2802                         hcd->phy_roothub = usb_phy_roothub_alloc_usb3_phy(hcd->self.sysdev);
2803                         if (IS_ERR(hcd->phy_roothub))
2804                                 return PTR_ERR(hcd->phy_roothub);
2805                 }
2806
2807                 retval = usb_phy_roothub_init(hcd->phy_roothub);
2808                 if (retval)
2809                         return retval;
2810
2811                 retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
2812                                                   PHY_MODE_USB_HOST_SS);
2813                 if (retval)
2814                         retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
2815                                                           PHY_MODE_USB_HOST);
2816                 if (retval)
2817                         goto err_usb_phy_roothub_power_on;
2818
2819                 retval = usb_phy_roothub_power_on(hcd->phy_roothub);
2820                 if (retval)
2821                         goto err_usb_phy_roothub_power_on;
2822         }
2823
2824         dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2825
2826         switch (authorized_default) {
2827         case USB_AUTHORIZE_NONE:
2828                 hcd->dev_policy = USB_DEVICE_AUTHORIZE_NONE;
2829                 break;
2830
2831         case USB_AUTHORIZE_INTERNAL:
2832                 hcd->dev_policy = USB_DEVICE_AUTHORIZE_INTERNAL;
2833                 break;
2834
2835         case USB_AUTHORIZE_ALL:
2836         case USB_AUTHORIZE_WIRED:
2837         default:
2838                 hcd->dev_policy = USB_DEVICE_AUTHORIZE_ALL;
2839                 break;
2840         }
2841
2842         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2843
2844         /* per default all interfaces are authorized */
2845         set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
2846
2847         /* HC is in reset state, but accessible.  Now do the one-time init,
2848          * bottom up so that hcds can customize the root hubs before hub_wq
2849          * starts talking to them.  (Note, bus id is assigned early too.)
2850          */
2851         retval = hcd_buffer_create(hcd);
2852         if (retval != 0) {
2853                 dev_dbg(hcd->self.sysdev, "pool alloc failed\n");
2854                 goto err_create_buf;
2855         }
2856
2857         retval = usb_register_bus(&hcd->self);
2858         if (retval < 0)
2859                 goto err_register_bus;
2860
2861         rhdev = usb_alloc_dev(NULL, &hcd->self, 0);
2862         if (rhdev == NULL) {
2863                 dev_err(hcd->self.sysdev, "unable to allocate root hub\n");
2864                 retval = -ENOMEM;
2865                 goto err_allocate_root_hub;
2866         }
2867         mutex_lock(&usb_port_peer_mutex);
2868         hcd->self.root_hub = rhdev;
2869         mutex_unlock(&usb_port_peer_mutex);
2870
2871         rhdev->rx_lanes = 1;
2872         rhdev->tx_lanes = 1;
2873         rhdev->ssp_rate = USB_SSP_GEN_UNKNOWN;
2874
2875         switch (hcd->speed) {
2876         case HCD_USB11:
2877                 rhdev->speed = USB_SPEED_FULL;
2878                 break;
2879         case HCD_USB2:
2880                 rhdev->speed = USB_SPEED_HIGH;
2881                 break;
2882         case HCD_USB3:
2883                 rhdev->speed = USB_SPEED_SUPER;
2884                 break;
2885         case HCD_USB32:
2886                 rhdev->rx_lanes = 2;
2887                 rhdev->tx_lanes = 2;
2888                 rhdev->ssp_rate = USB_SSP_GEN_2x2;
2889                 rhdev->speed = USB_SPEED_SUPER_PLUS;
2890                 break;
2891         case HCD_USB31:
2892                 rhdev->ssp_rate = USB_SSP_GEN_2x1;
2893                 rhdev->speed = USB_SPEED_SUPER_PLUS;
2894                 break;
2895         default:
2896                 retval = -EINVAL;
2897                 goto err_set_rh_speed;
2898         }
2899
2900         /* wakeup flag init defaults to "everything works" for root hubs,
2901          * but drivers can override it in reset() if needed, along with
2902          * recording the overall controller's system wakeup capability.
2903          */
2904         device_set_wakeup_capable(&rhdev->dev, 1);
2905
2906         /* HCD_FLAG_RH_RUNNING doesn't matter until the root hub is
2907          * registered.  But since the controller can die at any time,
2908          * let's initialize the flag before touching the hardware.
2909          */
2910         set_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
2911
2912         /* "reset" is misnamed; its role is now one-time init. the controller
2913          * should already have been reset (and boot firmware kicked off etc).
2914          */
2915         if (hcd->driver->reset) {
2916                 retval = hcd->driver->reset(hcd);
2917                 if (retval < 0) {
2918                         dev_err(hcd->self.controller, "can't setup: %d\n",
2919                                         retval);
2920                         goto err_hcd_driver_setup;
2921                 }
2922         }
2923         hcd->rh_pollable = 1;
2924
2925         retval = usb_phy_roothub_calibrate(hcd->phy_roothub);
2926         if (retval)
2927                 goto err_hcd_driver_setup;
2928
2929         /* NOTE: root hub and controller capabilities may not be the same */
2930         if (device_can_wakeup(hcd->self.controller)
2931                         && device_can_wakeup(&hcd->self.root_hub->dev))
2932                 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
2933
2934         /* initialize BHs */
2935         init_giveback_urb_bh(&hcd->high_prio_bh);
2936         hcd->high_prio_bh.high_prio = true;
2937         init_giveback_urb_bh(&hcd->low_prio_bh);
2938
2939         /* enable irqs just before we start the controller,
2940          * if the BIOS provides legacy PCI irqs.
2941          */
2942         if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
2943                 retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
2944                 if (retval)
2945                         goto err_request_irq;
2946         }
2947
2948         hcd->state = HC_STATE_RUNNING;
2949         retval = hcd->driver->start(hcd);
2950         if (retval < 0) {
2951                 dev_err(hcd->self.controller, "startup error %d\n", retval);
2952                 goto err_hcd_driver_start;
2953         }
2954
2955         /* starting here, usbcore will pay attention to the shared HCD roothub */
2956         shared_hcd = hcd->shared_hcd;
2957         if (!usb_hcd_is_primary_hcd(hcd) && shared_hcd && HCD_DEFER_RH_REGISTER(shared_hcd)) {
2958                 retval = register_root_hub(shared_hcd);
2959                 if (retval != 0)
2960                         goto err_register_root_hub;
2961
2962                 if (shared_hcd->uses_new_polling && HCD_POLL_RH(shared_hcd))
2963                         usb_hcd_poll_rh_status(shared_hcd);
2964         }
2965
2966         /* starting here, usbcore will pay attention to this root hub */
2967         if (!HCD_DEFER_RH_REGISTER(hcd)) {
2968                 retval = register_root_hub(hcd);
2969                 if (retval != 0)
2970                         goto err_register_root_hub;
2971
2972                 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
2973                         usb_hcd_poll_rh_status(hcd);
2974         }
2975
2976         return retval;
2977
2978 err_register_root_hub:
2979         usb_stop_hcd(hcd);
2980 err_hcd_driver_start:
2981         if (usb_hcd_is_primary_hcd(hcd) && hcd->irq > 0)
2982                 free_irq(irqnum, hcd);
2983 err_request_irq:
2984 err_hcd_driver_setup:
2985 err_set_rh_speed:
2986         usb_put_invalidate_rhdev(hcd);
2987 err_allocate_root_hub:
2988         usb_deregister_bus(&hcd->self);
2989 err_register_bus:
2990         hcd_buffer_destroy(hcd);
2991 err_create_buf:
2992         usb_phy_roothub_power_off(hcd->phy_roothub);
2993 err_usb_phy_roothub_power_on:
2994         usb_phy_roothub_exit(hcd->phy_roothub);
2995
2996         return retval;
2997 }
2998 EXPORT_SYMBOL_GPL(usb_add_hcd);
2999
3000 /**
3001  * usb_remove_hcd - shutdown processing for generic HCDs
3002  * @hcd: the usb_hcd structure to remove
3003  *
3004  * Context: task context, might sleep.
3005  *
3006  * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
3007  * invoking the HCD's stop() method.
3008  */
3009 void usb_remove_hcd(struct usb_hcd *hcd)
3010 {
3011         struct usb_device *rhdev;
3012         bool rh_registered;
3013
3014         if (!hcd) {
3015                 pr_debug("%s: hcd is NULL\n", __func__);
3016                 return;
3017         }
3018         rhdev = hcd->self.root_hub;
3019
3020         dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
3021
3022         usb_get_dev(rhdev);
3023         clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
3024         if (HC_IS_RUNNING (hcd->state))
3025                 hcd->state = HC_STATE_QUIESCING;
3026
3027         dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
3028         spin_lock_irq (&hcd_root_hub_lock);
3029         rh_registered = hcd->rh_registered;
3030         hcd->rh_registered = 0;
3031         spin_unlock_irq (&hcd_root_hub_lock);
3032
3033 #ifdef CONFIG_PM
3034         cancel_work_sync(&hcd->wakeup_work);
3035 #endif
3036         cancel_work_sync(&hcd->died_work);
3037
3038         mutex_lock(&usb_bus_idr_lock);
3039         if (rh_registered)
3040                 usb_disconnect(&rhdev);         /* Sets rhdev to NULL */
3041         mutex_unlock(&usb_bus_idr_lock);
3042
3043         /*
3044          * flush_work() isn't needed here because:
3045          * - driver's disconnect() called from usb_disconnect() should
3046          *   make sure its URBs are completed during the disconnect()
3047          *   callback
3048          *
3049          * - it is too late to run complete() here since driver may have
3050          *   been removed already now
3051          */
3052
3053         /* Prevent any more root-hub status calls from the timer.
3054          * The HCD might still restart the timer (if a port status change
3055          * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
3056          * the hub_status_data() callback.
3057          */
3058         usb_stop_hcd(hcd);
3059
3060         if (usb_hcd_is_primary_hcd(hcd)) {
3061                 if (hcd->irq > 0)
3062                         free_irq(hcd->irq, hcd);
3063         }
3064
3065         usb_deregister_bus(&hcd->self);
3066         hcd_buffer_destroy(hcd);
3067
3068         usb_phy_roothub_power_off(hcd->phy_roothub);
3069         usb_phy_roothub_exit(hcd->phy_roothub);
3070
3071         usb_put_invalidate_rhdev(hcd);
3072         hcd->flags = 0;
3073 }
3074 EXPORT_SYMBOL_GPL(usb_remove_hcd);
3075
3076 void
3077 usb_hcd_platform_shutdown(struct platform_device *dev)
3078 {
3079         struct usb_hcd *hcd = platform_get_drvdata(dev);
3080
3081         /* No need for pm_runtime_put(), we're shutting down */
3082         pm_runtime_get_sync(&dev->dev);
3083
3084         if (hcd->driver->shutdown)
3085                 hcd->driver->shutdown(hcd);
3086 }
3087 EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
3088
3089 int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr,
3090                             dma_addr_t dma, size_t size)
3091 {
3092         int err;
3093         void *local_mem;
3094
3095         hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, 4,
3096                                                   dev_to_node(hcd->self.sysdev),
3097                                                   dev_name(hcd->self.sysdev));
3098         if (IS_ERR(hcd->localmem_pool))
3099                 return PTR_ERR(hcd->localmem_pool);
3100
3101         /*
3102          * if a physical SRAM address was passed, map it, otherwise
3103          * allocate system memory as a buffer.
3104          */
3105         if (phys_addr)
3106                 local_mem = devm_memremap(hcd->self.sysdev, phys_addr,
3107                                           size, MEMREMAP_WC);
3108         else
3109                 local_mem = dmam_alloc_attrs(hcd->self.sysdev, size, &dma,
3110                                              GFP_KERNEL,
3111                                              DMA_ATTR_WRITE_COMBINE);
3112
3113         if (IS_ERR_OR_NULL(local_mem)) {
3114                 if (!local_mem)
3115                         return -ENOMEM;
3116
3117                 return PTR_ERR(local_mem);
3118         }
3119
3120         /*
3121          * Here we pass a dma_addr_t but the arg type is a phys_addr_t.
3122          * It's not backed by system memory and thus there's no kernel mapping
3123          * for it.
3124          */
3125         err = gen_pool_add_virt(hcd->localmem_pool, (unsigned long)local_mem,
3126                                 dma, size, dev_to_node(hcd->self.sysdev));
3127         if (err < 0) {
3128                 dev_err(hcd->self.sysdev, "gen_pool_add_virt failed with %d\n",
3129                         err);
3130                 return err;
3131         }
3132
3133         return 0;
3134 }
3135 EXPORT_SYMBOL_GPL(usb_hcd_setup_local_mem);
3136
3137 /*-------------------------------------------------------------------------*/
3138
3139 #if IS_ENABLED(CONFIG_USB_MON)
3140
3141 const struct usb_mon_operations *mon_ops;
3142
3143 /*
3144  * The registration is unlocked.
3145  * We do it this way because we do not want to lock in hot paths.
3146  *
3147  * Notice that the code is minimally error-proof. Because usbmon needs
3148  * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
3149  */
3150
3151 int usb_mon_register(const struct usb_mon_operations *ops)
3152 {
3153
3154         if (mon_ops)
3155                 return -EBUSY;
3156
3157         mon_ops = ops;
3158         mb();
3159         return 0;
3160 }
3161 EXPORT_SYMBOL_GPL (usb_mon_register);
3162
3163 void usb_mon_deregister (void)
3164 {
3165
3166         if (mon_ops == NULL) {
3167                 printk(KERN_ERR "USB: monitor was not registered\n");
3168                 return;
3169         }
3170         mon_ops = NULL;
3171         mb();
3172 }
3173 EXPORT_SYMBOL_GPL (usb_mon_deregister);
3174
3175 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */