| 1 | /* |
| 2 | * xen paravirt usb device backend |
| 3 | * |
| 4 | * (c) Juergen Gross <jgross@suse.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; under version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | * Contributions after 2012-01-13 are licensed under the terms of the |
| 19 | * GNU GPL, version 2 or (at your option) any later version. |
| 20 | */ |
| 21 | |
| 22 | #include "qemu/osdep.h" |
| 23 | #include <libusb.h> |
| 24 | #include <sys/user.h> |
| 25 | |
| 26 | #include "qemu/config-file.h" |
| 27 | #include "qemu/main-loop.h" |
| 28 | #include "qemu/option.h" |
| 29 | #include "hw/usb/usb.h" |
| 30 | #include "hw/xen/xen-legacy-backend.h" |
| 31 | #include "monitor/qdev.h" |
| 32 | #include "qapi/error.h" |
| 33 | #include "qobject/qdict.h" |
| 34 | #include "qobject/qstring.h" |
| 35 | |
| 36 | #include "hw/xen/interface/io/usbif.h" |
| 37 | |
| 38 | /* |
| 39 | * Check for required support of usbif.h: USBIF_SHORT_NOT_OK was the last |
| 40 | * macro added we rely on. |
| 41 | */ |
| 42 | #ifdef USBIF_SHORT_NOT_OK |
| 43 | |
| 44 | #define TR(xendev, lvl, fmt, args...) \ |
| 45 | { \ |
| 46 | struct timeval tv; \ |
| 47 | \ |
| 48 | gettimeofday(&tv, NULL); \ |
| 49 | xen_pv_printf(xendev, lvl, "%8ld.%06ld xen-usb(%s):" fmt, \ |
| 50 | tv.tv_sec, tv.tv_usec, __func__, ##args); \ |
| 51 | } |
| 52 | #define TR_BUS(xendev, fmt, args...) TR(xendev, 2, fmt, ##args) |
| 53 | #define TR_REQ(xendev, fmt, args...) TR(xendev, 3, fmt, ##args) |
| 54 | |
| 55 | #define USBBACK_MAXPORTS USBIF_PIPE_PORT_MASK |
| 56 | #define USB_DEV_ADDR_SIZE (USBIF_PIPE_DEV_MASK + 1) |
| 57 | |
| 58 | /* USB wire protocol: structure describing control request parameter. */ |
| 59 | struct usbif_ctrlrequest { |
| 60 | uint8_t bRequestType; |
| 61 | uint8_t bRequest; |
| 62 | uint16_t wValue; |
| 63 | uint16_t wIndex; |
| 64 | uint16_t wLength; |
| 65 | }; |
| 66 | |
| 67 | struct usbback_info; |
| 68 | struct usbback_req; |
| 69 | |
| 70 | struct usbback_stub { |
| 71 | USBDevice *dev; |
| 72 | USBPort port; |
| 73 | unsigned int speed; |
| 74 | bool attached; |
| 75 | QTAILQ_HEAD(, usbback_req) submit_q; |
| 76 | }; |
| 77 | |
| 78 | struct usbback_req { |
| 79 | struct usbback_info *usbif; |
| 80 | struct usbback_stub *stub; |
| 81 | struct usbif_urb_request req; |
| 82 | USBPacket packet; |
| 83 | |
| 84 | unsigned int nr_buffer_segs; /* # of transfer_buffer segments */ |
| 85 | unsigned int nr_extra_segs; /* # of iso_frame_desc segments */ |
| 86 | |
| 87 | QTAILQ_ENTRY(usbback_req) q; |
| 88 | |
| 89 | void *buffer; |
| 90 | void *isoc_buffer; |
| 91 | struct libusb_transfer *xfer; |
| 92 | |
| 93 | bool cancelled; |
| 94 | }; |
| 95 | |
| 96 | struct usbback_hotplug { |
| 97 | QSIMPLEQ_ENTRY(usbback_hotplug) q; |
| 98 | unsigned port; |
| 99 | }; |
| 100 | |
| 101 | struct usbback_info { |
| 102 | struct XenLegacyDevice xendev; /* must be first */ |
| 103 | USBBus bus; |
| 104 | uint32_t urb_ring_ref; |
| 105 | uint32_t conn_ring_ref; |
| 106 | void *urb_sring; |
| 107 | void *conn_sring; |
| 108 | struct usbif_urb_back_ring urb_ring; |
| 109 | struct usbif_conn_back_ring conn_ring; |
| 110 | int num_ports; |
| 111 | int usb_ver; |
| 112 | bool ring_error; |
| 113 | QTAILQ_HEAD(, usbback_req) req_free_q; |
| 114 | QSIMPLEQ_HEAD(, usbback_hotplug) hotplug_q; |
| 115 | struct usbback_stub ports[USBBACK_MAXPORTS]; |
| 116 | struct usbback_stub *addr_table[USB_DEV_ADDR_SIZE]; |
| 117 | QEMUBH *bh; |
| 118 | }; |
| 119 | |
| 120 | static struct usbback_req *usbback_get_req(struct usbback_info *usbif) |
| 121 | { |
| 122 | struct usbback_req *usbback_req; |
| 123 | |
| 124 | if (QTAILQ_EMPTY(&usbif->req_free_q)) { |
| 125 | usbback_req = g_new0(struct usbback_req, 1); |
| 126 | } else { |
| 127 | usbback_req = QTAILQ_FIRST(&usbif->req_free_q); |
| 128 | QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q); |
| 129 | } |
| 130 | return usbback_req; |
| 131 | } |
| 132 | |
| 133 | static void usbback_put_req(struct usbback_req *usbback_req) |
| 134 | { |
| 135 | struct usbback_info *usbif; |
| 136 | |
| 137 | usbif = usbback_req->usbif; |
| 138 | memset(usbback_req, 0, sizeof(*usbback_req)); |
| 139 | QTAILQ_INSERT_HEAD(&usbif->req_free_q, usbback_req, q); |
| 140 | } |
| 141 | |
| 142 | static int usbback_gnttab_map(struct usbback_req *usbback_req) |
| 143 | { |
| 144 | unsigned int nr_segs, i, prot; |
| 145 | uint32_t ref[USBIF_MAX_SEGMENTS_PER_REQUEST]; |
| 146 | struct usbback_info *usbif = usbback_req->usbif; |
| 147 | struct XenLegacyDevice *xendev = &usbif->xendev; |
| 148 | struct usbif_request_segment *seg; |
| 149 | void *addr; |
| 150 | |
| 151 | nr_segs = usbback_req->nr_buffer_segs + usbback_req->nr_extra_segs; |
| 152 | if (!nr_segs) { |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | if (nr_segs > USBIF_MAX_SEGMENTS_PER_REQUEST) { |
| 157 | xen_pv_printf(xendev, 0, "bad number of segments in request (%d)\n", |
| 158 | nr_segs); |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | |
| 162 | for (i = 0; i < nr_segs; i++) { |
| 163 | if ((unsigned)usbback_req->req.seg[i].offset + |
| 164 | (unsigned)usbback_req->req.seg[i].length > XEN_PAGE_SIZE) { |
| 165 | xen_pv_printf(xendev, 0, "segment crosses page boundary\n"); |
| 166 | return -EINVAL; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if (usbback_req->nr_buffer_segs) { |
| 171 | prot = PROT_READ; |
| 172 | if (usbif_pipein(usbback_req->req.pipe)) { |
| 173 | prot |= PROT_WRITE; |
| 174 | } |
| 175 | for (i = 0; i < usbback_req->nr_buffer_segs; i++) { |
| 176 | ref[i] = usbback_req->req.seg[i].gref; |
| 177 | } |
| 178 | usbback_req->buffer = |
| 179 | xen_be_map_grant_refs(xendev, ref, usbback_req->nr_buffer_segs, |
| 180 | prot); |
| 181 | |
| 182 | if (!usbback_req->buffer) { |
| 183 | return -ENOMEM; |
| 184 | } |
| 185 | |
| 186 | for (i = 0; i < usbback_req->nr_buffer_segs; i++) { |
| 187 | seg = usbback_req->req.seg + i; |
| 188 | addr = usbback_req->buffer + i * XEN_PAGE_SIZE + seg->offset; |
| 189 | qemu_iovec_add(&usbback_req->packet.iov, addr, seg->length); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | if (!usbif_pipeisoc(usbback_req->req.pipe)) { |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Right now isoc requests are not supported. |
| 199 | * Prepare supporting those by doing the work needed on the guest |
| 200 | * interface side. |
| 201 | */ |
| 202 | |
| 203 | if (!usbback_req->nr_extra_segs) { |
| 204 | xen_pv_printf(xendev, 0, "iso request without descriptor segments\n"); |
| 205 | return -EINVAL; |
| 206 | } |
| 207 | |
| 208 | prot = PROT_READ | PROT_WRITE; |
| 209 | for (i = 0; i < usbback_req->nr_extra_segs; i++) { |
| 210 | ref[i] = usbback_req->req.seg[i + usbback_req->req.nr_buffer_segs].gref; |
| 211 | } |
| 212 | usbback_req->isoc_buffer = |
| 213 | xen_be_map_grant_refs(xendev, ref, usbback_req->nr_extra_segs, |
| 214 | prot); |
| 215 | |
| 216 | if (!usbback_req->isoc_buffer) { |
| 217 | return -ENOMEM; |
| 218 | } |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | static int usbback_init_packet(struct usbback_req *usbback_req) |
| 224 | { |
| 225 | struct XenLegacyDevice *xendev = &usbback_req->usbif->xendev; |
| 226 | USBPacket *packet = &usbback_req->packet; |
| 227 | USBDevice *dev = usbback_req->stub->dev; |
| 228 | USBEndpoint *ep; |
| 229 | unsigned int pid, ep_nr; |
| 230 | bool sok; |
| 231 | int ret = 0; |
| 232 | |
| 233 | qemu_iovec_init(&packet->iov, USBIF_MAX_SEGMENTS_PER_REQUEST); |
| 234 | pid = usbif_pipein(usbback_req->req.pipe) ? USB_TOKEN_IN : USB_TOKEN_OUT; |
| 235 | ep_nr = usbif_pipeendpoint(usbback_req->req.pipe); |
| 236 | sok = !!(usbback_req->req.transfer_flags & USBIF_SHORT_NOT_OK); |
| 237 | if (usbif_pipectrl(usbback_req->req.pipe)) { |
| 238 | ep_nr = 0; |
| 239 | sok = false; |
| 240 | } |
| 241 | ep = usb_ep_get(dev, pid, ep_nr); |
| 242 | usb_packet_setup(packet, pid, ep, 0, 1, sok, true); |
| 243 | |
| 244 | switch (usbif_pipetype(usbback_req->req.pipe)) { |
| 245 | case USBIF_PIPE_TYPE_ISOC: |
| 246 | TR_REQ(xendev, "iso transfer %s: buflen: %x, %d frames\n", |
| 247 | (pid == USB_TOKEN_IN) ? "in" : "out", |
| 248 | usbback_req->req.buffer_length, |
| 249 | usbback_req->req.u.isoc.nr_frame_desc_segs); |
| 250 | ret = -EINVAL; /* isoc not implemented yet */ |
| 251 | break; |
| 252 | |
| 253 | case USBIF_PIPE_TYPE_INT: |
| 254 | TR_REQ(xendev, "int transfer %s: buflen: %x\n", |
| 255 | (pid == USB_TOKEN_IN) ? "in" : "out", |
| 256 | usbback_req->req.buffer_length); |
| 257 | break; |
| 258 | |
| 259 | case USBIF_PIPE_TYPE_CTRL: |
| 260 | packet->parameter = *(uint64_t *)usbback_req->req.u.ctrl; |
| 261 | TR_REQ(xendev, "ctrl parameter: %"PRIx64", buflen: %x\n", |
| 262 | packet->parameter, |
| 263 | usbback_req->req.buffer_length); |
| 264 | break; |
| 265 | |
| 266 | case USBIF_PIPE_TYPE_BULK: |
| 267 | TR_REQ(xendev, "bulk transfer %s: buflen: %x\n", |
| 268 | (pid == USB_TOKEN_IN) ? "in" : "out", |
| 269 | usbback_req->req.buffer_length); |
| 270 | break; |
| 271 | default: |
| 272 | ret = -EINVAL; |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | return ret; |
| 277 | } |
| 278 | |
| 279 | static void usbback_do_response(struct usbback_req *usbback_req, int32_t status, |
| 280 | int32_t actual_length, int32_t error_count) |
| 281 | { |
| 282 | uint32_t ref[USBIF_MAX_SEGMENTS_PER_REQUEST]; |
| 283 | struct usbback_info *usbif; |
| 284 | struct usbif_urb_response *res; |
| 285 | struct XenLegacyDevice *xendev; |
| 286 | unsigned int notify, i; |
| 287 | |
| 288 | usbif = usbback_req->usbif; |
| 289 | xendev = &usbif->xendev; |
| 290 | |
| 291 | TR_REQ(xendev, "id %d, status %d, length %d, errcnt %d\n", |
| 292 | usbback_req->req.id, status, actual_length, error_count); |
| 293 | |
| 294 | if (usbback_req->packet.iov.iov) { |
| 295 | qemu_iovec_destroy(&usbback_req->packet.iov); |
| 296 | } |
| 297 | |
| 298 | if (usbback_req->buffer) { |
| 299 | for (i = 0; i < usbback_req->nr_buffer_segs; i++) { |
| 300 | ref[i] = usbback_req->req.seg[i].gref; |
| 301 | } |
| 302 | xen_be_unmap_grant_refs(xendev, usbback_req->buffer, ref, |
| 303 | usbback_req->nr_buffer_segs); |
| 304 | usbback_req->buffer = NULL; |
| 305 | } |
| 306 | |
| 307 | if (usbback_req->isoc_buffer) { |
| 308 | for (i = 0; i < usbback_req->nr_extra_segs; i++) { |
| 309 | ref[i] = usbback_req->req.seg[i + usbback_req->req.nr_buffer_segs].gref; |
| 310 | } |
| 311 | xen_be_unmap_grant_refs(xendev, usbback_req->isoc_buffer, ref, |
| 312 | usbback_req->nr_extra_segs); |
| 313 | usbback_req->isoc_buffer = NULL; |
| 314 | } |
| 315 | |
| 316 | if (usbif->urb_sring) { |
| 317 | res = RING_GET_RESPONSE(&usbif->urb_ring, usbif->urb_ring.rsp_prod_pvt); |
| 318 | res->id = usbback_req->req.id; |
| 319 | res->status = status; |
| 320 | res->actual_length = actual_length; |
| 321 | res->error_count = error_count; |
| 322 | res->start_frame = 0; |
| 323 | usbif->urb_ring.rsp_prod_pvt++; |
| 324 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&usbif->urb_ring, notify); |
| 325 | |
| 326 | if (notify) { |
| 327 | xen_pv_send_notify(xendev); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | if (!usbback_req->cancelled) |
| 332 | usbback_put_req(usbback_req); |
| 333 | } |
| 334 | |
| 335 | static void usbback_do_response_ret(struct usbback_req *usbback_req, |
| 336 | int32_t status) |
| 337 | { |
| 338 | usbback_do_response(usbback_req, status, 0, 0); |
| 339 | } |
| 340 | |
| 341 | static int32_t usbback_xlat_status(int status) |
| 342 | { |
| 343 | switch (status) { |
| 344 | case USB_RET_SUCCESS: |
| 345 | return 0; |
| 346 | case USB_RET_NODEV: |
| 347 | return -ENODEV; |
| 348 | case USB_RET_STALL: |
| 349 | return -EPIPE; |
| 350 | case USB_RET_BABBLE: |
| 351 | return -EOVERFLOW; |
| 352 | case USB_RET_IOERROR: |
| 353 | return -EPROTO; |
| 354 | } |
| 355 | |
| 356 | return -ESHUTDOWN; |
| 357 | } |
| 358 | |
| 359 | static void usbback_packet_complete(struct usbback_req *usbback_req) |
| 360 | { |
| 361 | USBPacket *packet = &usbback_req->packet; |
| 362 | int32_t status; |
| 363 | |
| 364 | QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); |
| 365 | |
| 366 | status = usbback_xlat_status(packet->status); |
| 367 | usbback_do_response(usbback_req, status, packet->actual_length, 0); |
| 368 | } |
| 369 | |
| 370 | static void usbback_set_address(struct usbback_info *usbif, |
| 371 | struct usbback_stub *stub, |
| 372 | unsigned int cur_addr, unsigned int new_addr) |
| 373 | { |
| 374 | if (cur_addr) { |
| 375 | usbif->addr_table[cur_addr] = NULL; |
| 376 | } |
| 377 | if (new_addr) { |
| 378 | usbif->addr_table[new_addr] = stub; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static void usbback_cancel_req(struct usbback_req *usbback_req) |
| 383 | { |
| 384 | if (usb_packet_is_inflight(&usbback_req->packet)) { |
| 385 | usb_cancel_packet(&usbback_req->packet); |
| 386 | QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); |
| 387 | usbback_req->cancelled = true; |
| 388 | usbback_do_response_ret(usbback_req, -EPROTO); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | static void usbback_process_unlink_req(struct usbback_req *usbback_req) |
| 393 | { |
| 394 | struct usbback_info *usbif; |
| 395 | struct usbback_req *unlink_req; |
| 396 | unsigned int id, devnum; |
| 397 | int ret; |
| 398 | |
| 399 | usbif = usbback_req->usbif; |
| 400 | ret = 0; |
| 401 | id = usbback_req->req.u.unlink.unlink_id; |
| 402 | TR_REQ(&usbif->xendev, "unlink id %d\n", id); |
| 403 | devnum = usbif_pipedevice(usbback_req->req.pipe); |
| 404 | if (unlikely(devnum == 0)) { |
| 405 | usbback_req->stub = usbif->ports + |
| 406 | usbif_pipeportnum(usbback_req->req.pipe) - 1; |
| 407 | if (unlikely(!usbback_req->stub)) { |
| 408 | ret = -ENODEV; |
| 409 | goto fail_response; |
| 410 | } |
| 411 | } else { |
| 412 | if (unlikely(!usbif->addr_table[devnum])) { |
| 413 | ret = -ENODEV; |
| 414 | goto fail_response; |
| 415 | } |
| 416 | usbback_req->stub = usbif->addr_table[devnum]; |
| 417 | } |
| 418 | |
| 419 | QTAILQ_FOREACH(unlink_req, &usbback_req->stub->submit_q, q) { |
| 420 | if (unlink_req->req.id == id) { |
| 421 | usbback_cancel_req(unlink_req); |
| 422 | break; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | fail_response: |
| 427 | usbback_do_response_ret(usbback_req, ret); |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Checks whether a request can be handled at once or should be forwarded |
| 432 | * to the usb framework. |
| 433 | * Return value is: |
| 434 | * 0 in case of usb framework is needed |
| 435 | * 1 in case of local handling (no error) |
| 436 | * The request response has been queued already if return value not 0. |
| 437 | */ |
| 438 | static int usbback_check_and_submit(struct usbback_req *usbback_req) |
| 439 | { |
| 440 | struct usbback_info *usbif; |
| 441 | unsigned int devnum; |
| 442 | struct usbback_stub *stub; |
| 443 | struct usbif_ctrlrequest *ctrl; |
| 444 | int ret; |
| 445 | uint16_t wValue; |
| 446 | |
| 447 | usbif = usbback_req->usbif; |
| 448 | stub = NULL; |
| 449 | devnum = usbif_pipedevice(usbback_req->req.pipe); |
| 450 | ctrl = (struct usbif_ctrlrequest *)usbback_req->req.u.ctrl; |
| 451 | wValue = le16_to_cpu(ctrl->wValue); |
| 452 | |
| 453 | /* |
| 454 | * When the device is first connected or reset, USB device has no |
| 455 | * address. In this initial state, following requests are sent to device |
| 456 | * address (#0), |
| 457 | * |
| 458 | * 1. GET_DESCRIPTOR (with Descriptor Type is "DEVICE") is sent, |
| 459 | * and OS knows what device is connected to. |
| 460 | * |
| 461 | * 2. SET_ADDRESS is sent, and then device has its address. |
| 462 | * |
| 463 | * In the next step, SET_CONFIGURATION is sent to addressed device, and |
| 464 | * then the device is finally ready to use. |
| 465 | */ |
| 466 | if (unlikely(devnum == 0)) { |
| 467 | stub = usbif->ports + usbif_pipeportnum(usbback_req->req.pipe) - 1; |
| 468 | if (!stub->dev || !stub->attached) { |
| 469 | ret = -ENODEV; |
| 470 | goto do_response; |
| 471 | } |
| 472 | |
| 473 | switch (ctrl->bRequest) { |
| 474 | case USB_REQ_GET_DESCRIPTOR: |
| 475 | /* |
| 476 | * GET_DESCRIPTOR request to device #0. |
| 477 | * through normal transfer. |
| 478 | */ |
| 479 | TR_REQ(&usbif->xendev, "devnum 0 GET_DESCRIPTOR\n"); |
| 480 | usbback_req->stub = stub; |
| 481 | return 0; |
| 482 | case USB_REQ_SET_ADDRESS: |
| 483 | /* |
| 484 | * SET_ADDRESS request to device #0. |
| 485 | * add attached device to addr_table. |
| 486 | */ |
| 487 | TR_REQ(&usbif->xendev, "devnum 0 SET_ADDRESS\n"); |
| 488 | usbback_set_address(usbif, stub, 0, wValue); |
| 489 | ret = 0; |
| 490 | break; |
| 491 | default: |
| 492 | ret = -EINVAL; |
| 493 | break; |
| 494 | } |
| 495 | goto do_response; |
| 496 | } |
| 497 | |
| 498 | if (unlikely(!usbif->addr_table[devnum])) { |
| 499 | ret = -ENODEV; |
| 500 | goto do_response; |
| 501 | } |
| 502 | usbback_req->stub = usbif->addr_table[devnum]; |
| 503 | |
| 504 | /* |
| 505 | * Check special request |
| 506 | */ |
| 507 | if (ctrl->bRequest != USB_REQ_SET_ADDRESS) { |
| 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * SET_ADDRESS request to addressed device. |
| 513 | * change addr or remove from addr_table. |
| 514 | */ |
| 515 | usbback_set_address(usbif, usbback_req->stub, devnum, wValue); |
| 516 | ret = 0; |
| 517 | |
| 518 | do_response: |
| 519 | usbback_do_response_ret(usbback_req, ret); |
| 520 | return 1; |
| 521 | } |
| 522 | |
| 523 | static void usbback_dispatch(struct usbback_req *usbback_req) |
| 524 | { |
| 525 | int ret; |
| 526 | unsigned int devnum; |
| 527 | struct usbback_info *usbif; |
| 528 | |
| 529 | usbif = usbback_req->usbif; |
| 530 | |
| 531 | TR_REQ(&usbif->xendev, "start req_id %d pipe %08x\n", usbback_req->req.id, |
| 532 | usbback_req->req.pipe); |
| 533 | |
| 534 | /* unlink request */ |
| 535 | if (unlikely(usbif_pipeunlink(usbback_req->req.pipe))) { |
| 536 | usbback_process_unlink_req(usbback_req); |
| 537 | return; |
| 538 | } |
| 539 | |
| 540 | if (usbif_pipectrl(usbback_req->req.pipe)) { |
| 541 | if (usbback_check_and_submit(usbback_req)) { |
| 542 | return; |
| 543 | } |
| 544 | } else { |
| 545 | devnum = usbif_pipedevice(usbback_req->req.pipe); |
| 546 | usbback_req->stub = usbif->addr_table[devnum]; |
| 547 | |
| 548 | if (!usbback_req->stub || !usbback_req->stub->attached) { |
| 549 | ret = -ENODEV; |
| 550 | goto fail_response; |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | QTAILQ_INSERT_TAIL(&usbback_req->stub->submit_q, usbback_req, q); |
| 555 | |
| 556 | usbback_req->nr_buffer_segs = usbback_req->req.nr_buffer_segs; |
| 557 | usbback_req->nr_extra_segs = usbif_pipeisoc(usbback_req->req.pipe) ? |
| 558 | usbback_req->req.u.isoc.nr_frame_desc_segs : 0; |
| 559 | |
| 560 | ret = usbback_init_packet(usbback_req); |
| 561 | if (ret) { |
| 562 | xen_pv_printf(&usbif->xendev, 0, "invalid request\n"); |
| 563 | ret = -ESHUTDOWN; |
| 564 | goto fail_free_urb; |
| 565 | } |
| 566 | |
| 567 | ret = usbback_gnttab_map(usbback_req); |
| 568 | if (ret) { |
| 569 | xen_pv_printf(&usbif->xendev, 0, "invalid buffer, ret=%d\n", ret); |
| 570 | ret = -ESHUTDOWN; |
| 571 | goto fail_free_urb; |
| 572 | } |
| 573 | |
| 574 | usb_handle_packet(usbback_req->stub->dev, &usbback_req->packet); |
| 575 | if (usbback_req->packet.status != USB_RET_ASYNC) { |
| 576 | usbback_packet_complete(usbback_req); |
| 577 | } |
| 578 | return; |
| 579 | |
| 580 | fail_free_urb: |
| 581 | QTAILQ_REMOVE(&usbback_req->stub->submit_q, usbback_req, q); |
| 582 | |
| 583 | fail_response: |
| 584 | usbback_do_response_ret(usbback_req, ret); |
| 585 | } |
| 586 | |
| 587 | static void usbback_hotplug_notify(struct usbback_info *usbif) |
| 588 | { |
| 589 | struct usbif_conn_back_ring *ring = &usbif->conn_ring; |
| 590 | struct usbif_conn_request req; |
| 591 | struct usbif_conn_response *res; |
| 592 | struct usbback_hotplug *usb_hp; |
| 593 | unsigned int notify; |
| 594 | |
| 595 | if (!usbif->conn_sring) { |
| 596 | return; |
| 597 | } |
| 598 | |
| 599 | /* Check for full ring. */ |
| 600 | if ((RING_SIZE(ring) - ring->rsp_prod_pvt - ring->req_cons) == 0) { |
| 601 | xen_pv_send_notify(&usbif->xendev); |
| 602 | return; |
| 603 | } |
| 604 | |
| 605 | usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q); |
| 606 | QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q); |
| 607 | |
| 608 | RING_COPY_REQUEST(ring, ring->req_cons, &req); |
| 609 | ring->req_cons++; |
| 610 | ring->sring->req_event = ring->req_cons + 1; |
| 611 | |
| 612 | res = RING_GET_RESPONSE(ring, ring->rsp_prod_pvt); |
| 613 | res->id = req.id; |
| 614 | res->portnum = usb_hp->port; |
| 615 | res->speed = usbif->ports[usb_hp->port - 1].speed; |
| 616 | ring->rsp_prod_pvt++; |
| 617 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(ring, notify); |
| 618 | |
| 619 | if (notify) { |
| 620 | xen_pv_send_notify(&usbif->xendev); |
| 621 | } |
| 622 | |
| 623 | TR_BUS(&usbif->xendev, "hotplug port %d speed %d\n", usb_hp->port, |
| 624 | res->speed); |
| 625 | |
| 626 | g_free(usb_hp); |
| 627 | |
| 628 | if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { |
| 629 | qemu_bh_schedule(usbif->bh); |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | static void usbback_bh(void *opaque) |
| 634 | { |
| 635 | struct usbback_info *usbif; |
| 636 | struct usbif_urb_back_ring *urb_ring; |
| 637 | struct usbback_req *usbback_req; |
| 638 | RING_IDX rc, rp; |
| 639 | unsigned int more_to_do; |
| 640 | |
| 641 | usbif = opaque; |
| 642 | if (usbif->ring_error) { |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | if (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { |
| 647 | usbback_hotplug_notify(usbif); |
| 648 | } |
| 649 | |
| 650 | urb_ring = &usbif->urb_ring; |
| 651 | rc = urb_ring->req_cons; |
| 652 | rp = urb_ring->sring->req_prod; |
| 653 | xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ |
| 654 | |
| 655 | if (RING_REQUEST_PROD_OVERFLOW(urb_ring, rp)) { |
| 656 | rc = urb_ring->rsp_prod_pvt; |
| 657 | xen_pv_printf(&usbif->xendev, 0, "domU provided bogus ring requests " |
| 658 | "(%#x - %#x = %u). Halting ring processing.\n", |
| 659 | rp, rc, rp - rc); |
| 660 | usbif->ring_error = true; |
| 661 | return; |
| 662 | } |
| 663 | |
| 664 | while (rc != rp) { |
| 665 | if (RING_REQUEST_CONS_OVERFLOW(urb_ring, rc)) { |
| 666 | break; |
| 667 | } |
| 668 | usbback_req = usbback_get_req(usbif); |
| 669 | |
| 670 | RING_COPY_REQUEST(urb_ring, rc, &usbback_req->req); |
| 671 | usbback_req->usbif = usbif; |
| 672 | |
| 673 | usbback_dispatch(usbback_req); |
| 674 | |
| 675 | urb_ring->req_cons = ++rc; |
| 676 | } |
| 677 | |
| 678 | RING_FINAL_CHECK_FOR_REQUESTS(urb_ring, more_to_do); |
| 679 | if (more_to_do) { |
| 680 | qemu_bh_schedule(usbif->bh); |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | static void usbback_hotplug_enq(struct usbback_info *usbif, unsigned port) |
| 685 | { |
| 686 | struct usbback_hotplug *usb_hp; |
| 687 | |
| 688 | usb_hp = g_new0(struct usbback_hotplug, 1); |
| 689 | usb_hp->port = port; |
| 690 | QSIMPLEQ_INSERT_TAIL(&usbif->hotplug_q, usb_hp, q); |
| 691 | usbback_hotplug_notify(usbif); |
| 692 | } |
| 693 | |
| 694 | static void usbback_portid_drain(struct usbback_info *usbif, unsigned port) |
| 695 | { |
| 696 | struct usbback_req *req, *tmp; |
| 697 | bool sched = false; |
| 698 | |
| 699 | QTAILQ_FOREACH_SAFE(req, &usbif->ports[port - 1].submit_q, q, tmp) { |
| 700 | usbback_cancel_req(req); |
| 701 | sched = true; |
| 702 | } |
| 703 | |
| 704 | if (sched) { |
| 705 | qemu_bh_schedule(usbif->bh); |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | static void usbback_portid_detach(struct usbback_info *usbif, unsigned port) |
| 710 | { |
| 711 | if (!usbif->ports[port - 1].attached) { |
| 712 | return; |
| 713 | } |
| 714 | |
| 715 | usbif->ports[port - 1].speed = USBIF_SPEED_NONE; |
| 716 | usbif->ports[port - 1].attached = false; |
| 717 | usbback_portid_drain(usbif, port); |
| 718 | usbback_hotplug_enq(usbif, port); |
| 719 | } |
| 720 | |
| 721 | static void usbback_portid_remove(struct usbback_info *usbif, unsigned port) |
| 722 | { |
| 723 | if (!usbif->ports[port - 1].dev) { |
| 724 | return; |
| 725 | } |
| 726 | |
| 727 | object_unparent(OBJECT(usbif->ports[port - 1].dev)); |
| 728 | usbif->ports[port - 1].dev = NULL; |
| 729 | usbback_portid_detach(usbif, port); |
| 730 | |
| 731 | TR_BUS(&usbif->xendev, "port %d removed\n", port); |
| 732 | } |
| 733 | |
| 734 | static void usbback_portid_add(struct usbback_info *usbif, unsigned port, |
| 735 | char *busid) |
| 736 | { |
| 737 | unsigned speed; |
| 738 | char *portname; |
| 739 | Error *local_err = NULL; |
| 740 | QDict *qdict; |
| 741 | QemuOpts *opts; |
| 742 | char *tmp; |
| 743 | |
| 744 | if (usbif->ports[port - 1].dev) { |
| 745 | return; |
| 746 | } |
| 747 | |
| 748 | portname = strchr(busid, '-'); |
| 749 | if (!portname) { |
| 750 | xen_pv_printf(&usbif->xendev, 0, "device %s illegal specification\n", |
| 751 | busid); |
| 752 | return; |
| 753 | } |
| 754 | portname++; |
| 755 | |
| 756 | qdict = qdict_new(); |
| 757 | qdict_put_str(qdict, "driver", "usb-host"); |
| 758 | tmp = g_strdup_printf("%s.0", DEVICE(&usbif->xendev)->id); |
| 759 | qdict_put_str(qdict, "bus", tmp); |
| 760 | g_free(tmp); |
| 761 | tmp = g_strdup_printf("%s-%u", DEVICE(&usbif->xendev)->id, port); |
| 762 | qdict_put_str(qdict, "id", tmp); |
| 763 | g_free(tmp); |
| 764 | qdict_put_int(qdict, "port", port); |
| 765 | qdict_put_int(qdict, "hostbus", atoi(busid)); |
| 766 | qdict_put_str(qdict, "hostport", portname); |
| 767 | opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, |
| 768 | &error_abort); |
| 769 | usbif->ports[port - 1].dev = USB_DEVICE(qdev_device_add(opts, &local_err)); |
| 770 | if (!usbif->ports[port - 1].dev) { |
| 771 | qobject_unref(qdict); |
| 772 | xen_pv_printf(&usbif->xendev, 0, |
| 773 | "device %s could not be opened: %s\n", |
| 774 | busid, error_get_pretty(local_err)); |
| 775 | error_free(local_err); |
| 776 | return; |
| 777 | } |
| 778 | qobject_unref(qdict); |
| 779 | speed = usbif->ports[port - 1].dev->speed; |
| 780 | switch (speed) { |
| 781 | case USB_SPEED_LOW: |
| 782 | speed = USBIF_SPEED_LOW; |
| 783 | break; |
| 784 | case USB_SPEED_FULL: |
| 785 | speed = USBIF_SPEED_FULL; |
| 786 | break; |
| 787 | case USB_SPEED_HIGH: |
| 788 | speed = (usbif->usb_ver < USB_VER_USB20) ? |
| 789 | USBIF_SPEED_NONE : USBIF_SPEED_HIGH; |
| 790 | break; |
| 791 | default: |
| 792 | speed = USBIF_SPEED_NONE; |
| 793 | break; |
| 794 | } |
| 795 | if (speed == USBIF_SPEED_NONE) { |
| 796 | xen_pv_printf(&usbif->xendev, 0, "device %s wrong speed\n", busid); |
| 797 | object_unparent(OBJECT(usbif->ports[port - 1].dev)); |
| 798 | usbif->ports[port - 1].dev = NULL; |
| 799 | return; |
| 800 | } |
| 801 | usb_device_reset(usbif->ports[port - 1].dev); |
| 802 | usbif->ports[port - 1].speed = speed; |
| 803 | usbif->ports[port - 1].attached = true; |
| 804 | QTAILQ_INIT(&usbif->ports[port - 1].submit_q); |
| 805 | usbback_hotplug_enq(usbif, port); |
| 806 | |
| 807 | TR_BUS(&usbif->xendev, "port %d attached\n", port); |
| 808 | } |
| 809 | |
| 810 | static void usbback_process_port(struct usbback_info *usbif, unsigned port) |
| 811 | { |
| 812 | char node[8]; |
| 813 | char *busid; |
| 814 | |
| 815 | snprintf(node, sizeof(node), "port/%d", port); |
| 816 | busid = xenstore_read_be_str(&usbif->xendev, node); |
| 817 | if (busid == NULL) { |
| 818 | xen_pv_printf(&usbif->xendev, 0, "xenstore_read %s failed\n", node); |
| 819 | return; |
| 820 | } |
| 821 | |
| 822 | /* Remove portid, if the port is not connected. */ |
| 823 | if (strlen(busid) == 0) { |
| 824 | usbback_portid_remove(usbif, port); |
| 825 | } else { |
| 826 | usbback_portid_add(usbif, port, busid); |
| 827 | } |
| 828 | |
| 829 | g_free(busid); |
| 830 | } |
| 831 | |
| 832 | static void usbback_disconnect(struct XenLegacyDevice *xendev) |
| 833 | { |
| 834 | struct usbback_info *usbif; |
| 835 | unsigned int i; |
| 836 | |
| 837 | TR_BUS(xendev, "start\n"); |
| 838 | |
| 839 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 840 | |
| 841 | xen_pv_unbind_evtchn(xendev); |
| 842 | |
| 843 | if (usbif->urb_sring) { |
| 844 | xen_be_unmap_grant_ref(xendev, usbif->urb_sring, usbif->urb_ring_ref); |
| 845 | usbif->urb_sring = NULL; |
| 846 | } |
| 847 | if (usbif->conn_sring) { |
| 848 | xen_be_unmap_grant_ref(xendev, usbif->conn_sring, usbif->conn_ring_ref); |
| 849 | usbif->conn_sring = NULL; |
| 850 | } |
| 851 | |
| 852 | for (i = 0; i < usbif->num_ports; i++) { |
| 853 | if (usbif->ports[i].dev) { |
| 854 | usbback_portid_drain(usbif, i + 1); |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | TR_BUS(xendev, "finished\n"); |
| 859 | } |
| 860 | |
| 861 | static int usbback_connect(struct XenLegacyDevice *xendev) |
| 862 | { |
| 863 | struct usbback_info *usbif; |
| 864 | struct usbif_urb_sring *urb_sring; |
| 865 | struct usbif_conn_sring *conn_sring; |
| 866 | int urb_ring_ref; |
| 867 | int conn_ring_ref; |
| 868 | unsigned int i, max_grants; |
| 869 | |
| 870 | TR_BUS(xendev, "start\n"); |
| 871 | |
| 872 | /* max_grants: for each request and for the rings (request and connect). */ |
| 873 | max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2; |
| 874 | xen_be_set_max_grant_refs(xendev, max_grants); |
| 875 | |
| 876 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 877 | |
| 878 | if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) { |
| 879 | xen_pv_printf(xendev, 0, "error reading urb-ring-ref\n"); |
| 880 | return -1; |
| 881 | } |
| 882 | if (xenstore_read_fe_int(xendev, "conn-ring-ref", &conn_ring_ref)) { |
| 883 | xen_pv_printf(xendev, 0, "error reading conn-ring-ref\n"); |
| 884 | return -1; |
| 885 | } |
| 886 | if (xenstore_read_fe_int(xendev, "event-channel", &xendev->remote_port)) { |
| 887 | xen_pv_printf(xendev, 0, "error reading event-channel\n"); |
| 888 | return -1; |
| 889 | } |
| 890 | |
| 891 | usbif->urb_sring = xen_be_map_grant_ref(xendev, urb_ring_ref, |
| 892 | PROT_READ | PROT_WRITE); |
| 893 | usbif->conn_sring = xen_be_map_grant_ref(xendev, conn_ring_ref, |
| 894 | PROT_READ | PROT_WRITE); |
| 895 | if (!usbif->urb_sring || !usbif->conn_sring) { |
| 896 | xen_pv_printf(xendev, 0, "error mapping rings\n"); |
| 897 | usbback_disconnect(xendev); |
| 898 | return -1; |
| 899 | } |
| 900 | |
| 901 | usbif->urb_ring_ref = urb_ring_ref; |
| 902 | usbif->conn_ring_ref = conn_ring_ref; |
| 903 | urb_sring = usbif->urb_sring; |
| 904 | conn_sring = usbif->conn_sring; |
| 905 | BACK_RING_INIT(&usbif->urb_ring, urb_sring, XEN_PAGE_SIZE); |
| 906 | BACK_RING_INIT(&usbif->conn_ring, conn_sring, XEN_PAGE_SIZE); |
| 907 | |
| 908 | xen_be_bind_evtchn(xendev); |
| 909 | |
| 910 | xen_pv_printf(xendev, 1, "urb-ring-ref %d, conn-ring-ref %d, " |
| 911 | "remote port %d, local port %d\n", urb_ring_ref, |
| 912 | conn_ring_ref, xendev->remote_port, xendev->local_port); |
| 913 | |
| 914 | for (i = 1; i <= usbif->num_ports; i++) { |
| 915 | if (usbif->ports[i - 1].dev) { |
| 916 | usbback_hotplug_enq(usbif, i); |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | return 0; |
| 921 | } |
| 922 | |
| 923 | static void usbback_backend_changed(struct XenLegacyDevice *xendev, |
| 924 | const char *node) |
| 925 | { |
| 926 | struct usbback_info *usbif; |
| 927 | unsigned int i; |
| 928 | |
| 929 | TR_BUS(xendev, "path %s\n", node); |
| 930 | |
| 931 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 932 | for (i = 1; i <= usbif->num_ports; i++) { |
| 933 | usbback_process_port(usbif, i); |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | static int usbback_init(struct XenLegacyDevice *xendev) |
| 938 | { |
| 939 | struct usbback_info *usbif; |
| 940 | |
| 941 | TR_BUS(xendev, "start\n"); |
| 942 | |
| 943 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 944 | |
| 945 | if (xenstore_read_be_int(xendev, "num-ports", &usbif->num_ports) || |
| 946 | usbif->num_ports < 1 || usbif->num_ports > USBBACK_MAXPORTS) { |
| 947 | xen_pv_printf(xendev, 0, "num-ports not readable or out of bounds\n"); |
| 948 | return -1; |
| 949 | } |
| 950 | if (xenstore_read_be_int(xendev, "usb-ver", &usbif->usb_ver) || |
| 951 | (usbif->usb_ver != USB_VER_USB11 && usbif->usb_ver != USB_VER_USB20)) { |
| 952 | xen_pv_printf(xendev, 0, "usb-ver not readable or out of bounds\n"); |
| 953 | return -1; |
| 954 | } |
| 955 | |
| 956 | usbback_backend_changed(xendev, "port"); |
| 957 | |
| 958 | TR_BUS(xendev, "finished\n"); |
| 959 | |
| 960 | return 0; |
| 961 | } |
| 962 | |
| 963 | static void xen_bus_attach(USBPort *port) |
| 964 | { |
| 965 | struct usbback_info *usbif; |
| 966 | |
| 967 | usbif = port->opaque; |
| 968 | TR_BUS(&usbif->xendev, "\n"); |
| 969 | usbif->ports[port->index].attached = true; |
| 970 | usbback_hotplug_enq(usbif, port->index + 1); |
| 971 | } |
| 972 | |
| 973 | static void xen_bus_detach(USBPort *port) |
| 974 | { |
| 975 | struct usbback_info *usbif; |
| 976 | |
| 977 | usbif = port->opaque; |
| 978 | TR_BUS(&usbif->xendev, "\n"); |
| 979 | usbback_portid_detach(usbif, port->index + 1); |
| 980 | } |
| 981 | |
| 982 | static void xen_bus_child_detach(USBPort *port, USBDevice *child) |
| 983 | { |
| 984 | struct usbback_info *usbif; |
| 985 | |
| 986 | usbif = port->opaque; |
| 987 | TR_BUS(&usbif->xendev, "\n"); |
| 988 | } |
| 989 | |
| 990 | static void xen_bus_complete(USBPort *port, USBPacket *packet) |
| 991 | { |
| 992 | struct usbback_req *usbback_req; |
| 993 | struct usbback_info *usbif; |
| 994 | |
| 995 | usbback_req = container_of(packet, struct usbback_req, packet); |
| 996 | if (usbback_req->cancelled) { |
| 997 | g_free(usbback_req); |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | usbif = usbback_req->usbif; |
| 1002 | TR_REQ(&usbif->xendev, "\n"); |
| 1003 | usbback_packet_complete(usbback_req); |
| 1004 | } |
| 1005 | |
| 1006 | static USBPortOps xen_usb_port_ops = { |
| 1007 | .attach = xen_bus_attach, |
| 1008 | .detach = xen_bus_detach, |
| 1009 | .child_detach = xen_bus_child_detach, |
| 1010 | .complete = xen_bus_complete, |
| 1011 | }; |
| 1012 | |
| 1013 | static USBBusOps xen_usb_bus_ops = { |
| 1014 | }; |
| 1015 | |
| 1016 | static void usbback_alloc(struct XenLegacyDevice *xendev) |
| 1017 | { |
| 1018 | struct usbback_info *usbif; |
| 1019 | USBPort *p; |
| 1020 | unsigned int i; |
| 1021 | |
| 1022 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 1023 | |
| 1024 | usb_bus_new(&usbif->bus, sizeof(usbif->bus), &xen_usb_bus_ops, |
| 1025 | DEVICE(xendev)); |
| 1026 | for (i = 0; i < USBBACK_MAXPORTS; i++) { |
| 1027 | p = &(usbif->ports[i].port); |
| 1028 | usb_register_port(&usbif->bus, p, usbif, i, &xen_usb_port_ops, |
| 1029 | USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL | |
| 1030 | USB_SPEED_MASK_HIGH); |
| 1031 | } |
| 1032 | |
| 1033 | QTAILQ_INIT(&usbif->req_free_q); |
| 1034 | QSIMPLEQ_INIT(&usbif->hotplug_q); |
| 1035 | usbif->bh = qemu_bh_new_guarded(usbback_bh, usbif, |
| 1036 | &DEVICE(xendev)->mem_reentrancy_guard); |
| 1037 | } |
| 1038 | |
| 1039 | static int usbback_free(struct XenLegacyDevice *xendev) |
| 1040 | { |
| 1041 | struct usbback_info *usbif; |
| 1042 | struct usbback_req *usbback_req; |
| 1043 | struct usbback_hotplug *usb_hp; |
| 1044 | unsigned int i; |
| 1045 | |
| 1046 | TR_BUS(xendev, "start\n"); |
| 1047 | |
| 1048 | usbback_disconnect(xendev); |
| 1049 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 1050 | for (i = 1; i <= usbif->num_ports; i++) { |
| 1051 | usbback_portid_remove(usbif, i); |
| 1052 | } |
| 1053 | |
| 1054 | while (!QTAILQ_EMPTY(&usbif->req_free_q)) { |
| 1055 | usbback_req = QTAILQ_FIRST(&usbif->req_free_q); |
| 1056 | QTAILQ_REMOVE(&usbif->req_free_q, usbback_req, q); |
| 1057 | g_free(usbback_req); |
| 1058 | } |
| 1059 | while (!QSIMPLEQ_EMPTY(&usbif->hotplug_q)) { |
| 1060 | usb_hp = QSIMPLEQ_FIRST(&usbif->hotplug_q); |
| 1061 | QSIMPLEQ_REMOVE_HEAD(&usbif->hotplug_q, q); |
| 1062 | g_free(usb_hp); |
| 1063 | } |
| 1064 | |
| 1065 | qemu_bh_delete(usbif->bh); |
| 1066 | |
| 1067 | for (i = 0; i < USBBACK_MAXPORTS; i++) { |
| 1068 | usb_unregister_port(&usbif->bus, &(usbif->ports[i].port)); |
| 1069 | } |
| 1070 | |
| 1071 | usb_bus_release(&usbif->bus); |
| 1072 | |
| 1073 | TR_BUS(xendev, "finished\n"); |
| 1074 | |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | static void usbback_event(struct XenLegacyDevice *xendev) |
| 1079 | { |
| 1080 | struct usbback_info *usbif; |
| 1081 | |
| 1082 | usbif = container_of(xendev, struct usbback_info, xendev); |
| 1083 | qemu_bh_schedule(usbif->bh); |
| 1084 | } |
| 1085 | |
| 1086 | static const struct XenDevOps xen_usb_ops = { |
| 1087 | .size = sizeof(struct usbback_info), |
| 1088 | .flags = DEVOPS_FLAG_NEED_GNTDEV, |
| 1089 | .init = usbback_init, |
| 1090 | .alloc = usbback_alloc, |
| 1091 | .free = usbback_free, |
| 1092 | .backend_changed = usbback_backend_changed, |
| 1093 | .initialise = usbback_connect, |
| 1094 | .disconnect = usbback_disconnect, |
| 1095 | .event = usbback_event, |
| 1096 | }; |
| 1097 | |
| 1098 | static void xen_usb_register_backend(void) |
| 1099 | { |
| 1100 | xen_be_register("qusb", &xen_usb_ops); |
| 1101 | } |
| 1102 | xen_backend_init(xen_usb_register_backend); |
| 1103 | #endif |