win-pvdrivers

annotate xenpci/xenbus.c @ 153:f9e747698949

Masked cpu with (MAX_VIRT_CPUS - 1). xenpci now loads and enumerates children. Graceful shutdown now works.
author James Harper <james.harper@bendigoit.com.au>
date Thu Jan 24 10:25:18 2008 +1100 (2008-01-24)
parents e1ec2bacd4b0
children 58d13f9f8ef3
rev   line source
james@0 1 /*
james@0 2 PV Drivers for Windows Xen HVM Domains
james@0 3 Copyright (C) 2007 James Harper
james@0 4
james@0 5 This program is free software; you can redistribute it and/or
james@0 6 modify it under the terms of the GNU General Public License
james@0 7 as published by the Free Software Foundation; either version 2
james@0 8 of the License, or (at your option) any later version.
james@0 9
james@0 10 This program is distributed in the hope that it will be useful,
james@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
james@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
james@0 13 GNU General Public License for more details.
james@0 14
james@0 15 You should have received a copy of the GNU General Public License
james@0 16 along with this program; if not, write to the Free Software
james@0 17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
james@0 18 */
james@0 19
james@0 20 #include "xenpci.h"
james@0 21 #include "io/xs_wire.h"
james@0 22 #include <stdlib.h>
james@0 23
james@0 24 #pragma warning( disable : 4204 )
james@0 25 #pragma warning( disable : 4221 )
james@0 26
andy@15 27 struct write_req {
andy@15 28 const void *data;
andy@15 29 unsigned len;
james@0 30 };
james@0 31
james@0 32 static void
james@0 33 XenBus_ReadThreadProc(PVOID StartContext);
james@0 34 static void
james@0 35 XenBus_WatchThreadProc(PVOID StartContext);
james@0 36 static BOOLEAN
james@0 37 XenBus_Interrupt(PKINTERRUPT Interrupt, PVOID ServiceContext);
james@0 38
andy@15 39 static int allocate_xenbus_id(WDFDEVICE Device)
james@0 40 {
andy@15 41 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 42
james@0 43 static int probe;
james@0 44 int o_probe;
james@0 45
james@134 46 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 47
james@0 48 for (;;)
james@0 49 {
james@0 50 // spin_lock(&req_lock);
andy@15 51 if (xpdd->nr_live_reqs < NR_XB_REQS)
james@0 52 break;
james@0 53 // spin_unlock(&req_lock);
james@0 54 // wait_event(req_wq, (nr_live_reqs < NR_REQS));
james@0 55 }
james@0 56
james@0 57 o_probe = probe;
james@0 58
james@0 59 for (;;)
james@0 60 {
andy@15 61 if (!xpdd->req_info[o_probe].In_Use)
james@0 62 break;
andy@15 63 o_probe = (o_probe + 1) % NR_XB_REQS;
james@0 64 // BUG_ON(o_probe == probe);
james@0 65 }
andy@15 66 xpdd->nr_live_reqs++;
andy@15 67 xpdd->req_info[o_probe].In_Use = 1;
andy@15 68 probe = (o_probe + 1) % NR_XB_REQS;
james@0 69 //spin_unlock(&req_lock);
james@0 70 //init_waitqueue_head(&req_info[o_probe].waitq);
andy@15 71 KeInitializeEvent(&xpdd->req_info[o_probe].WaitEvent, SynchronizationEvent, FALSE);
james@0 72
james@134 73 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 74
james@0 75 return o_probe;
james@0 76 }
james@0 77
andy@15 78 static void release_xenbus_id(WDFDEVICE Device, int id)
james@0 79 {
andy@15 80 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 81
james@0 82 // BUG_ON(!req_info[id].in_use);
james@0 83 // spin_lock(&req_lock);
andy@15 84 xpdd->req_info[id].In_Use = 0;
andy@15 85 xpdd->nr_live_reqs--;
andy@15 86 xpdd->req_info[id].In_Use = 0;
james@0 87 // if (nr_live_reqs == NR_REQS - 1)
james@0 88 // wake_up(&req_wq);
james@0 89 // spin_unlock(&req_lock);
james@0 90 }
james@0 91
james@0 92 static char *errmsg(struct xsd_sockmsg *rep)
james@0 93 {
james@0 94 char *res;
andy@15 95
james@0 96 if (!rep) {
james@0 97 char msg[] = "No reply";
james@0 98 size_t len = strlen(msg) + 1;
james@0 99 return memcpy(ExAllocatePoolWithTag(NonPagedPool, len, XENPCI_POOL_TAG), msg, len);
james@0 100 }
james@0 101 if (rep->type != XS_ERROR)
james@0 102 return NULL;
james@0 103 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
james@0 104 memcpy(res, rep + 1, rep->len);
james@0 105 res[rep->len] = 0;
james@0 106 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 107 return res;
james@0 108 }
james@0 109
james@0 110 static void memcpy_from_ring(const void *Ring,
james@0 111 void *Dest,
james@0 112 int off,
james@0 113 int len)
james@0 114 {
james@0 115 int c1, c2;
james@0 116 const char *ring = Ring;
james@0 117 char *dest = Dest;
james@0 118 c1 = min(len, XENSTORE_RING_SIZE - off);
james@0 119 c2 = len - c1;
james@0 120 memcpy(dest, ring + off, c1);
james@0 121 memcpy(dest + c1, ring, c2);
james@0 122 }
james@0 123
andy@15 124 static void xb_write(
andy@13 125 WDFDEVICE Device,
andy@13 126 int type,
andy@13 127 int req_id,
andy@13 128 xenbus_transaction_t trans_id,
andy@13 129 const struct write_req *req,
andy@13 130 int nr_reqs)
james@0 131 {
andy@15 132 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 133 XENSTORE_RING_IDX prod;
james@0 134 int r;
james@0 135 size_t len = 0;
james@0 136 const struct write_req *cur_req;
james@0 137 size_t req_off;
james@0 138 size_t total_off;
james@0 139 size_t this_chunk;
james@0 140 struct xsd_sockmsg m = {type, req_id, trans_id };
james@0 141 struct write_req header_req = { &m, sizeof(m) };
james@0 142
james@134 143 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 144
james@0 145 for (r = 0; r < nr_reqs; r++)
james@145 146 len += (size_t)req[r].len;
james@145 147 m.len = (ULONG)len;
james@0 148 len += sizeof(m);
james@0 149
james@0 150 cur_req = &header_req;
james@0 151
james@0 152 // BUG_ON(len > XENSTORE_RING_SIZE);
james@0 153 /* Wait for the ring to drain to the point where we can send the
james@0 154 message. */
andy@15 155 prod = xpdd->xen_store_interface->req_prod;
james@0 156
james@0 157 //KdPrint((__DRIVER_NAME " prod = %08x\n", prod));
james@0 158
andy@15 159 if (prod + len - xpdd->xen_store_interface->req_cons > XENSTORE_RING_SIZE)
james@0 160 {
james@0 161 /* Wait for there to be space on the ring */
james@0 162 //KdPrint((__DRIVER_NAME " prod %d, len %d, cons %d, size %d; waiting.\n", prod, len, xen_store_interface->req_cons, XENSTORE_RING_SIZE));
james@0 163 // wait_event(xb_waitq, xen_store_interface->req_prod + len - xen_store_interface->req_cons <= XENSTORE_RING_SIZE);
james@0 164 //KdPrint((__DRIVER_NAME " Back from wait.\n"));
andy@15 165 prod = xpdd->xen_store_interface->req_prod;
james@0 166 }
james@0 167
james@0 168 /* We're now guaranteed to be able to send the message without
james@0 169 overflowing the ring. Do so. */
james@0 170
james@0 171 total_off = 0;
james@0 172 req_off = 0;
james@0 173
james@0 174 while (total_off < len)
james@0 175 {
james@0 176 this_chunk = min(cur_req->len - req_off,XENSTORE_RING_SIZE - MASK_XENSTORE_IDX(prod));
andy@15 177 memcpy((char *)xpdd->xen_store_interface->req + MASK_XENSTORE_IDX(prod), (char *)cur_req->data + req_off, this_chunk);
james@145 178 prod += (XENSTORE_RING_IDX)this_chunk;
james@0 179 req_off += this_chunk;
james@0 180 total_off += this_chunk;
james@0 181 if (req_off == cur_req->len)
james@0 182 {
james@0 183 req_off = 0;
james@0 184 if (cur_req == &header_req)
james@0 185 cur_req = req;
james@0 186 else
james@0 187 cur_req++;
james@0 188 }
james@0 189 }
james@0 190
james@0 191 //KdPrint((__DRIVER_NAME " Complete main loop of xb_write.\n"));
james@0 192
james@0 193 // BUG_ON(req_off != 0);
james@0 194 // BUG_ON(total_off != len);
james@0 195 // BUG_ON(prod > xen_store_interface->req_cons + XENSTORE_RING_SIZE);
james@0 196
james@0 197 /* Remote must see entire message before updating indexes */
james@0 198 //_WriteBarrier();
james@0 199 KeMemoryBarrier();
james@0 200
james@145 201 xpdd->xen_store_interface->req_prod += (XENSTORE_RING_IDX)len;
james@0 202
james@0 203 //KdPrint((__DRIVER_NAME " prod = %08x\n", xen_store_interface->req_prod));
james@0 204
james@0 205 /* Send evtchn to notify remote */
andy@15 206 EvtChn_Notify(Device, xpdd->xen_store_evtchn);
james@0 207
james@134 208 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 209 }
james@0 210
james@0 211 static struct xsd_sockmsg *
andy@13 212 xenbus_msg_reply(
andy@13 213 WDFDEVICE Device,
andy@13 214 int type,
andy@13 215 xenbus_transaction_t trans,
andy@13 216 struct write_req *io,
andy@13 217 int nr_reqs)
james@0 218 {
andy@15 219 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 220 int id;
james@0 221
james@134 222 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 223
andy@15 224 id = allocate_xenbus_id(Device);
andy@94 225
james@96 226 xb_write(Device, type, id, trans, io, nr_reqs);
james@95 227
andy@15 228 KeWaitForSingleObject(&xpdd->req_info[id].WaitEvent, Executive, KernelMode, FALSE, NULL);
james@95 229
james@96 230 release_xenbus_id(Device, id);
james@0 231
james@134 232 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@96 233
andy@94 234 return xpdd->req_info[id].Reply;
james@0 235 }
james@0 236
james@0 237 char *
andy@15 238 XenBus_Read(
andy@13 239 PVOID Context,
andy@13 240 xenbus_transaction_t xbt,
andy@13 241 const char *path,
andy@13 242 char **value)
james@0 243 {
andy@13 244 WDFDEVICE Device = Context;
james@145 245 struct write_req req[] = { {path, (ULONG)strlen(path) + 1} };
andy@13 246 struct xsd_sockmsg *rep;
andy@13 247 char *res;
andy@13 248 char *msg;
james@0 249
james@134 250 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 251
andy@13 252 rep = xenbus_msg_reply(Device, XS_READ, xbt, req, ARRAY_SIZE(req));
andy@13 253 msg = errmsg(rep);
andy@13 254 if (msg) {
andy@13 255 *value = NULL;
andy@13 256 return msg;
andy@13 257 }
andy@13 258 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
andy@13 259 memcpy(res, rep + 1, rep->len);
andy@13 260 res[rep->len] = 0;
andy@13 261 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 262 *value = res;
james@95 263
james@134 264 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 265
andy@13 266 return NULL;
james@0 267 }
james@0 268
james@0 269 char *
andy@13 270 XenBus_Write(
andy@13 271 PVOID Context,
andy@13 272 xenbus_transaction_t xbt,
andy@13 273 const char *path,
andy@13 274 const char *value)
james@0 275 {
andy@13 276 WDFDEVICE Device = Context;
andy@13 277 struct write_req req[] = {
james@145 278 {path, (ULONG)strlen(path) + 1},
james@145 279 {value, (ULONG)strlen(value) + 1},
andy@13 280 };
andy@13 281 struct xsd_sockmsg *rep;
andy@13 282 char *msg;
james@0 283
james@134 284 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 285
andy@13 286 rep = xenbus_msg_reply(Device, XS_WRITE, xbt, req, ARRAY_SIZE(req));
andy@13 287 msg = errmsg(rep);
andy@13 288 if (msg)
andy@13 289 return msg;
andy@13 290 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 291
james@134 292 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 293
andy@13 294 return NULL;
james@0 295 }
james@0 296
james@0 297 NTSTATUS
andy@13 298 XenBus_Init(WDFDEVICE Device)
james@0 299 {
andy@37 300 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@35 301 NTSTATUS Status;
james@35 302 int i;
andy@37 303
james@95 304 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@35 305
james@128 306 KeInitializeSpinLock(&xpdd->WatchLock);
james@128 307
andy@15 308 xpdd->xen_store_evtchn = EvtChn_GetXenStorePort(Device);
andy@15 309 xpdd->xen_store_interface = EvtChn_GetXenStoreRingAddr(Device);
james@0 310
james@35 311 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@128 312 {
andy@38 313 xpdd->XenBus_WatchEntries[i].Active = 0;
james@128 314 xpdd->XenBus_WatchEntries[i].Running = 0;
james@128 315 KeInitializeEvent(&xpdd->XenBus_WatchEntries[i].CompleteEvent, SynchronizationEvent, FALSE);
james@128 316 }
james@0 317
andy@15 318 KeInitializeEvent(&xpdd->XenBus_ReadThreadEvent, SynchronizationEvent, FALSE);
andy@15 319 KeInitializeEvent(&xpdd->XenBus_WatchThreadEvent, SynchronizationEvent, FALSE);
andy@38 320 xpdd->XenBus_ShuttingDown = FALSE;
james@0 321
andy@41 322 Status = PsCreateSystemThread(&xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_ReadThreadProc, Device);
andy@101 323 if (!NT_SUCCESS(Status))
andy@101 324 {
andy@101 325 KdPrint((__DRIVER_NAME " Could not start read thread\n"));
andy@101 326 return STATUS_UNSUCCESSFUL;
andy@101 327 }
james@35 328
andy@41 329 Status = PsCreateSystemThread(&xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_WatchThreadProc, Device);
andy@101 330 if (!NT_SUCCESS(Status))
andy@101 331 {
andy@101 332 KdPrint((__DRIVER_NAME " Could not start watch thread\n"));
andy@101 333 return STATUS_UNSUCCESSFUL;
andy@101 334 }
james@35 335
james@95 336 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 337
james@0 338 return STATUS_SUCCESS;
james@0 339 }
james@0 340
james@0 341 NTSTATUS
andy@13 342 XenBus_Start(WDFDEVICE Device)
james@0 343 {
andy@38 344 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@38 345
james@95 346 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 347
andy@89 348 EvtChn_BindDpc(Device, xpdd->xen_store_evtchn, XenBus_Interrupt, Device);
james@0 349
james@95 350 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 351
james@0 352 return STATUS_SUCCESS;
james@0 353 }
james@0 354
james@0 355 NTSTATUS
andy@13 356 XenBus_Stop(WDFDEVICE Device)
james@0 357 {
andy@15 358 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 359 int i;
james@0 360
james@95 361 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@35 362
james@0 363 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@0 364 {
andy@38 365 if (xpdd->XenBus_WatchEntries[i].Active)
andy@38 366 XenBus_RemWatch(Device, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path,
andy@38 367 xpdd->XenBus_WatchEntries[i].ServiceRoutine,
andy@38 368 xpdd->XenBus_WatchEntries[i].ServiceContext);
james@0 369 }
james@0 370
andy@15 371 EvtChn_Unbind(Device, xpdd->xen_store_evtchn);
james@0 372
james@95 373 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@35 374
james@35 375 return STATUS_SUCCESS;
james@35 376 }
james@35 377
james@35 378 NTSTATUS
andy@37 379 XenBus_Close(WDFDEVICE Device)
james@35 380 {
andy@38 381 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@56 382 //KWAIT_BLOCK WaitBlockArray[2];
james@35 383 PVOID WaitArray[2];
james@35 384
andy@38 385 xpdd->XenBus_ShuttingDown = TRUE;
james@35 386
andy@38 387 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
andy@38 388 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
andy@38 389 ObReferenceObjectByHandle(xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[0], NULL);
andy@38 390 ObReferenceObjectByHandle(xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[1], NULL);
james@48 391 KeWaitForSingleObject(WaitArray[0], Executive, KernelMode, FALSE, NULL);
james@48 392 KeWaitForSingleObject(WaitArray[1], Executive, KernelMode, FALSE, NULL);
andy@38 393 xpdd->XenBus_ShuttingDown = FALSE;
james@35 394
andy@15 395 ZwClose(xpdd->XenBus_WatchThreadHandle);
andy@15 396 ZwClose(xpdd->XenBus_ReadThreadHandle);
james@0 397
james@95 398 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@35 399
james@0 400 return STATUS_SUCCESS;
james@0 401 }
james@0 402
james@0 403 char *
andy@13 404 XenBus_List(
andy@13 405 PVOID Context,
andy@13 406 xenbus_transaction_t xbt,
andy@13 407 const char *pre,
andy@13 408 char ***contents)
james@0 409 {
andy@13 410 WDFDEVICE Device = Context;
james@0 411 struct xsd_sockmsg *reply, *repmsg;
james@145 412 struct write_req req[] = { { pre, (ULONG)strlen(pre)+1 } };
james@0 413 ULONG nr_elems, x, i;
james@0 414 char **res;
james@0 415 char *msg;
james@0 416
james@134 417 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 418
andy@13 419 repmsg = xenbus_msg_reply(Device, XS_DIRECTORY, xbt, req, ARRAY_SIZE(req));
james@0 420 msg = errmsg(repmsg);
andy@15 421 if (msg)
andy@15 422 {
james@0 423 *contents = NULL;
james@134 424 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 425 return msg;
james@0 426 }
james@0 427 reply = repmsg + 1;
james@0 428 for (x = nr_elems = 0; x < repmsg->len; x++)
andy@15 429 {
james@0 430 nr_elems += (((char *)reply)[x] == 0);
andy@15 431 }
andy@15 432 res = ExAllocatePoolWithTag(NonPagedPool, sizeof(res[0]) * (nr_elems + 1),
andy@15 433 XENPCI_POOL_TAG);
andy@15 434 for (x = i = 0; i < nr_elems; i++)
andy@15 435 {
james@145 436 int l = (int)strlen((char *)reply + x);
james@0 437 res[i] = ExAllocatePoolWithTag(NonPagedPool, l + 1, XENPCI_POOL_TAG);
james@0 438 memcpy(res[i], (char *)reply + x, l + 1);
james@0 439 x += l + 1;
james@0 440 }
james@0 441 res[i] = NULL;
james@0 442 ExFreePoolWithTag(repmsg, XENPCI_POOL_TAG);
james@0 443 *contents = res;
james@134 444 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 445 return NULL;
james@0 446 }
james@0 447
andy@15 448 static void
andy@15 449 XenBus_ReadThreadProc(PVOID StartContext)
james@0 450 {
james@0 451 int NewWriteIndex;
james@0 452 struct xsd_sockmsg msg;
james@0 453 char *payload;
james@0 454 char *path, *token;
andy@15 455 WDFDEVICE Device = StartContext;
andy@15 456 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 457
james@0 458 for(;;)
james@0 459 {
andy@15 460 KeWaitForSingleObject(&xpdd->XenBus_ReadThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 461 if (xpdd->XenBus_ShuttingDown)
james@35 462 {
james@35 463 KdPrint((__DRIVER_NAME " Shutdown detected in ReadThreadProc\n"));
james@35 464 PsTerminateSystemThread(0);
james@35 465 }
james@0 466 //KdPrint((__DRIVER_NAME " ReadThread Woken (Count = %d)\n", ReadThreadWaitCount++));
andy@15 467 while (xpdd->xen_store_interface->rsp_prod != xpdd->xen_store_interface->rsp_cons)
james@0 468 {
james@0 469 //KdPrint((__DRIVER_NAME " a - Rsp_cons %d, rsp_prod %d.\n", xen_store_interface->rsp_cons, xen_store_interface->rsp_prod));
andy@15 470 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg))
james@0 471 {
james@0 472 //KdPrint((__DRIVER_NAME " +++ Message incomplete (not even a full header)\n"));
james@0 473 break;
james@0 474 }
james@0 475 //_ReadBarrier();
james@0 476 KeMemoryBarrier();
andy@15 477 memcpy_from_ring(xpdd->xen_store_interface->rsp, &msg,
andy@15 478 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), sizeof(msg));
andy@15 479 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg) + msg.len)
james@0 480 {
james@0 481 //KdPrint((__DRIVER_NAME " +++ Message incomplete (header but not full body)\n"));
james@0 482 break;
james@0 483 }
james@0 484
andy@20 485 if (msg.type != XS_WATCH_EVENT)
andy@20 486 {
andy@20 487 xpdd->req_info[msg.req_id].Reply = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@20 488 memcpy_from_ring(xpdd->xen_store_interface->rsp,
andy@20 489 xpdd->req_info[msg.req_id].Reply,
andy@20 490 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons),
andy@20 491 msg.len + sizeof(msg));
andy@20 492 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
andy@20 493 KeSetEvent(&xpdd->req_info[msg.req_id].WaitEvent, 1, FALSE);
andy@20 494 }
andy@20 495 else // a watch: add to watch ring and signal watch thread
james@0 496 {
james@0 497 payload = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@15 498 memcpy_from_ring(xpdd->xen_store_interface->rsp, payload,
andy@15 499 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), msg.len + sizeof(msg));
andy@15 500 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
james@0 501 path = payload + sizeof(msg);
james@0 502 token = path + strlen(path) + 1;
james@0 503
andy@15 504 NewWriteIndex = (xpdd->XenBus_WatchRingWriteIndex + 1) & 127;
andy@15 505 if (NewWriteIndex != xpdd->XenBus_WatchRingReadIndex)
james@0 506 {
andy@15 507 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Path, path, 128);
andy@15 508 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Token, token, 10);
andy@15 509 xpdd->XenBus_WatchRingWriteIndex = NewWriteIndex;
james@0 510 }
james@0 511 else
james@0 512 {
james@0 513 KdPrint((__DRIVER_NAME " +++ Queue full Path = %s Token = %s\n", path, token));
james@0 514 // drop the message on the floor
james@0 515 continue;
james@0 516 }
james@0 517
james@0 518 ExFreePoolWithTag(payload, XENPCI_POOL_TAG);
james@0 519 //KdPrint((__DRIVER_NAME " +++ Watch Path = %s Token = %s\n", path, token));
andy@15 520 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@0 521 }
james@0 522 }
james@0 523 }
james@0 524 }
james@0 525
james@0 526 static void
james@0 527 XenBus_WatchThreadProc(PVOID StartContext)
james@0 528 {
james@0 529 int index;
james@0 530 PXENBUS_WATCH_ENTRY entry;
andy@15 531 WDFDEVICE Device = StartContext;
andy@15 532 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@128 533 KIRQL OldIrql;
james@0 534
james@0 535 for(;;)
james@0 536 {
andy@37 537 KeWaitForSingleObject(&xpdd->XenBus_WatchThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 538 if (xpdd->XenBus_ShuttingDown)
james@35 539 {
james@35 540 KdPrint((__DRIVER_NAME " Shutdown detected in WatchThreadProc\n"));
james@35 541 PsTerminateSystemThread(0);
james@35 542 }
andy@38 543 while (xpdd->XenBus_WatchRingReadIndex != xpdd->XenBus_WatchRingWriteIndex)
james@0 544 {
andy@15 545 xpdd->XenBus_WatchRingReadIndex =
andy@15 546 (xpdd->XenBus_WatchRingReadIndex + 1) % WATCH_RING_SIZE;
andy@15 547 index = atoi(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token);
james@0 548
andy@15 549 entry = &xpdd->XenBus_WatchEntries[index];
james@128 550 KeAcquireSpinLock(&xpdd->WatchLock, &OldIrql);
james@128 551 if (!entry->Active || !entry->ServiceRoutine)
james@0 552 {
james@128 553 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@138 554 KdPrint((__DRIVER_NAME " No watch for index %d\n", index));
james@0 555 continue;
james@0 556 }
james@138 557 KdPrint((__DRIVER_NAME " --- About to call watch\n"));
james@138 558 if (entry->RemovePending)
james@138 559 {
james@138 560 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@138 561 KdPrint((__DRIVER_NAME " Not calling watch - remove is pending\n"));
james@138 562 continue;
james@138 563 }
james@128 564 entry->Running = 1;
james@128 565 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@0 566 entry->Count++;
james@138 567 KdPrint((__DRIVER_NAME " --- for %s\n", xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path));
andy@15 568 entry->ServiceRoutine(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path, entry->ServiceContext);
james@128 569 entry->Running = 0;
james@128 570 KeSetEvent(&entry->CompleteEvent, 1, FALSE);
james@0 571 }
james@0 572 }
james@0 573 }
james@0 574
james@0 575 char *
andy@15 576 XenBus_AddWatch(
andy@13 577 PVOID Context,
andy@13 578 xenbus_transaction_t xbt,
andy@13 579 const char *Path,
andy@13 580 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 581 PVOID ServiceContext)
james@0 582 {
andy@13 583 WDFDEVICE Device = Context;
andy@15 584 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 585 struct xsd_sockmsg *rep;
james@0 586 char *msg;
james@0 587 int i;
james@0 588 char Token[20];
james@0 589 struct write_req req[2];
andy@94 590 PXENBUS_WATCH_ENTRY w_entry;
james@128 591 KIRQL OldIrql;
james@0 592
james@153 593 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 594
andy@94 595 ASSERT(strlen(Path) < ARRAY_SIZE(w_entry->Path));
james@0 596
james@128 597 KeAcquireSpinLock(&xpdd->WatchLock, &OldIrql);
james@128 598
james@0 599 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@15 600 if (xpdd->XenBus_WatchEntries[i].Active == 0)
james@0 601 break;
james@0 602
james@0 603 if (i == MAX_WATCH_ENTRIES)
james@0 604 {
james@0 605 KdPrint((__DRIVER_NAME " +++ No more watch slots left\n"));
james@128 606 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@0 607 return NULL;
james@0 608 }
james@0 609
andy@94 610 /* must init watchentry before starting watch */
james@128 611
andy@94 612 w_entry = &xpdd->XenBus_WatchEntries[i];
andy@94 613 strncpy(w_entry->Path, Path, ARRAY_SIZE(w_entry->Path));
andy@94 614 w_entry->ServiceRoutine = ServiceRoutine;
andy@94 615 w_entry->ServiceContext = ServiceContext;
andy@94 616 w_entry->Count = 0;
andy@94 617 w_entry->Active = 1;
andy@94 618
james@128 619 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@128 620
james@0 621 req[0].data = Path;
james@145 622 req[0].len = (ULONG)strlen(Path) + 1;
james@0 623
james@0 624 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 625 req[1].data = Token;
james@145 626 req[1].len = (ULONG)strlen(Token) + 1;
james@0 627
andy@93 628 rep = xenbus_msg_reply(Device, XS_WATCH, xbt, req, ARRAY_SIZE(req));
andy@93 629
andy@93 630 msg = errmsg(rep);
andy@93 631 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@93 632 if (msg)
andy@93 633 {
andy@93 634 xpdd->XenBus_WatchEntries[i].Active = 0;
james@96 635 KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch (%s)\n", msg));
andy@93 636 return msg;
andy@93 637 }
andy@93 638
james@153 639 KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch\n"));
james@0 640
james@0 641 return NULL;
james@0 642 }
james@0 643
james@0 644 char *
andy@13 645 XenBus_RemWatch(
andy@13 646 PVOID Context,
andy@13 647 xenbus_transaction_t xbt,
andy@13 648 const char *Path,
andy@13 649 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 650 PVOID ServiceContext)
james@0 651 {
andy@13 652 WDFDEVICE Device = Context;
andy@15 653 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 654 struct xsd_sockmsg *rep;
james@0 655 char *msg;
james@0 656 int i;
james@0 657 char Token[20];
james@0 658 struct write_req req[2];
james@128 659 KIRQL OldIrql;
james@0 660
james@138 661 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 662
james@128 663 KeAcquireSpinLock(&xpdd->WatchLock, &OldIrql);
james@128 664
james@0 665 // check that Path < 128 chars
james@0 666
james@0 667 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
andy@15 668 if (xpdd->XenBus_WatchEntries[i].Active == 1
andy@15 669 && strcmp(xpdd->XenBus_WatchEntries[i].Path, Path) == 0
andy@15 670 && xpdd->XenBus_WatchEntries[i].ServiceRoutine == ServiceRoutine
andy@15 671 && xpdd->XenBus_WatchEntries[i].ServiceContext == ServiceContext)
james@0 672 break;
james@0 673 }
james@0 674
james@0 675 if (i == MAX_WATCH_ENTRIES)
james@0 676 {
james@128 677 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@0 678 KdPrint((__DRIVER_NAME " Watch not set - can't remove\n"));
james@0 679 return NULL;
james@0 680 }
james@0 681
james@138 682 if (xpdd->XenBus_WatchEntries[i].RemovePending)
james@128 683 {
james@132 684 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@138 685 KdPrint((__DRIVER_NAME " Remove already pending - can't remove\n"));
james@138 686 return NULL;
james@138 687 }
james@138 688 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@138 689
james@138 690 while (xpdd->XenBus_WatchEntries[i].Running)
james@128 691 KeWaitForSingleObject(&xpdd->XenBus_WatchEntries[i].CompleteEvent, Executive, KernelMode, FALSE, NULL);
james@138 692
james@138 693 KeAcquireSpinLock(&xpdd->WatchLock, &OldIrql);
james@128 694
james@128 695 xpdd->XenBus_WatchEntries[i].Active = 0;
james@138 696 xpdd->XenBus_WatchEntries[i].RemovePending = 0;
james@128 697 xpdd->XenBus_WatchEntries[i].Path[0] = 0;
james@128 698
james@128 699 KeReleaseSpinLock(&xpdd->WatchLock, OldIrql);
james@128 700
james@0 701 req[0].data = Path;
james@145 702 req[0].len = (ULONG)strlen(Path) + 1;
james@0 703
james@0 704 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 705 req[1].data = Token;
james@145 706 req[1].len = (ULONG)strlen(Token) + 1;
james@0 707
andy@13 708 rep = xenbus_msg_reply(Device, XS_UNWATCH, xbt, req, ARRAY_SIZE(req));
james@0 709
james@0 710 msg = errmsg(rep);
james@0 711 if (msg)
james@128 712 {
james@0 713 return msg;
james@128 714 }
james@0 715
james@138 716 ASSERT(rep != NULL);
james@138 717
james@0 718 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 719
james@138 720 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 721
james@0 722 return NULL;
james@0 723 }
james@0 724
james@0 725
james@0 726 char *
andy@13 727 XenBus_StartTransaction(PVOID Context, xenbus_transaction_t *xbt)
james@0 728 {
andy@13 729 WDFDEVICE Device = Context;
james@0 730 /* xenstored becomes angry if you send a length 0 message, so just
james@0 731 shove a nul terminator on the end */
james@0 732 struct write_req req = { "", 1};
james@0 733 struct xsd_sockmsg *rep;
james@0 734 char *err;
james@0 735
james@134 736 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 737
andy@13 738 rep = xenbus_msg_reply(Device, XS_TRANSACTION_START, 0, &req, 1);
james@0 739 err = errmsg(rep);
james@0 740 if (err)
james@0 741 return err;
james@0 742 *xbt = atoi((char *)(rep + 1));
james@0 743 //sscanf((char *)(rep + 1), "%u", xbt);
james@0 744 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 745
james@134 746 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 747
james@0 748 return NULL;
james@0 749 }
james@0 750
james@0 751 char *
andy@15 752 XenBus_EndTransaction(
andy@15 753 PVOID Context,
andy@15 754 xenbus_transaction_t t,
andy@15 755 int abort,
andy@15 756 int *retry)
james@0 757 {
andy@13 758 WDFDEVICE Device = Context;
james@0 759 struct xsd_sockmsg *rep;
james@0 760 struct write_req req;
james@0 761 char *err;
james@0 762
james@134 763 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 764
james@0 765 *retry = 0;
james@0 766
james@0 767 req.data = abort ? "F" : "T";
james@0 768 req.len = 2;
andy@13 769 rep = xenbus_msg_reply(Device, XS_TRANSACTION_END, t, &req, 1);
james@0 770 err = errmsg(rep);
james@0 771 if (err) {
james@0 772 if (!strcmp(err, "EAGAIN")) {
james@0 773 *retry = 1;
james@0 774 ExFreePoolWithTag(err, XENPCI_POOL_TAG);
james@0 775 return NULL;
james@0 776 } else {
james@0 777 return err;
james@0 778 }
james@0 779 }
james@0 780 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 781
james@134 782 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 783
james@0 784 return NULL;
james@0 785 }
james@0 786
james@0 787 static BOOLEAN
james@0 788 XenBus_Interrupt(PKINTERRUPT Interrupt, PVOID ServiceContext)
james@0 789 {
andy@15 790 WDFDEVICE Device = ServiceContext;
andy@15 791 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 792
james@0 793 UNREFERENCED_PARAMETER(Interrupt);
james@0 794
james@134 795 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 796
andy@15 797 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
james@0 798
james@134 799 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 800
james@0 801 return TRUE;
james@0 802 }
james@0 803
james@0 804 char *
andy@15 805 XenBus_Printf(
andy@15 806 PVOID Context,
andy@15 807 xenbus_transaction_t xbt,
andy@15 808 const char *path,
andy@15 809 const char *fmt,
andy@15 810 ...)
james@0 811 {
andy@13 812 WDFDEVICE Device = Context;
james@0 813 va_list ap;
andy@101 814 char buf[512];
james@95 815 char *retval;
james@95 816
james@134 817 // KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 818
james@0 819 va_start(ap, fmt);
james@0 820 RtlStringCbVPrintfA(buf, ARRAY_SIZE(buf), fmt, ap);
james@0 821 va_end(ap);
james@95 822 retval = XenBus_Write(Device, xbt, path, buf);
james@95 823
james@134 824 // KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 825
james@95 826 return retval;
andy@37 827 }