win-pvdrivers

annotate xenpci/xenbus.c @ 101:bbc88927c82b

prefast complained about excessive stack usage, so change max printf to 512; check status when creating threads (prefast)e
author Andy Grover <andy.grover@oracle.com>
date Mon Jan 07 19:29:28 2008 -0800 (2008-01-07)
parents 652ccd25fc7e
children 9ebc64a86e57
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@95 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@95 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@95 143 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 144
james@0 145 for (r = 0; r < nr_reqs; r++)
james@0 146 len += req[r].len;
james@0 147 m.len = 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@0 178 prod += 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
andy@15 201 xpdd->xen_store_interface->req_prod += 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@95 208 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@95 222 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@95 232 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;
andy@13 245 struct write_req req[] = { {path, strlen(path) + 1} };
andy@13 246 struct xsd_sockmsg *rep;
andy@13 247 char *res;
andy@13 248 char *msg;
james@0 249
james@95 250 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@95 264 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[] = {
andy@13 278 {path, strlen(path) + 1},
andy@13 279 {value, strlen(value) + 1},
andy@13 280 };
andy@13 281 struct xsd_sockmsg *rep;
andy@13 282 char *msg;
james@0 283
james@95 284 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@95 292 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
andy@15 306 xpdd->xen_store_evtchn = EvtChn_GetXenStorePort(Device);
andy@15 307 xpdd->xen_store_interface = EvtChn_GetXenStoreRingAddr(Device);
james@0 308
james@35 309 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@38 310 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 311
andy@15 312 KeInitializeEvent(&xpdd->XenBus_ReadThreadEvent, SynchronizationEvent, FALSE);
andy@15 313 KeInitializeEvent(&xpdd->XenBus_WatchThreadEvent, SynchronizationEvent, FALSE);
andy@38 314 xpdd->XenBus_ShuttingDown = FALSE;
james@0 315
james@35 316 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 317 //Status = PsCreateSystemThread(&XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_ReadThreadProc, NULL);
andy@41 318 Status = PsCreateSystemThread(&xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_ReadThreadProc, Device);
andy@101 319 if (!NT_SUCCESS(Status))
andy@101 320 {
andy@101 321 KdPrint((__DRIVER_NAME " Could not start read thread\n"));
andy@101 322 return STATUS_UNSUCCESSFUL;
andy@101 323 }
james@35 324
james@35 325 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 326 //Status = PsCreateSystemThread(&XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_WatchThreadProc, NULL);
andy@41 327 Status = PsCreateSystemThread(&xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_WatchThreadProc, Device);
andy@101 328 if (!NT_SUCCESS(Status))
andy@101 329 {
andy@101 330 KdPrint((__DRIVER_NAME " Could not start watch thread\n"));
andy@101 331 return STATUS_UNSUCCESSFUL;
andy@101 332 }
james@35 333
james@95 334 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 335
james@0 336 return STATUS_SUCCESS;
james@0 337 }
james@0 338
james@0 339 NTSTATUS
andy@13 340 XenBus_Start(WDFDEVICE Device)
james@0 341 {
andy@38 342 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@38 343
james@95 344 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 345
andy@89 346 EvtChn_BindDpc(Device, xpdd->xen_store_evtchn, XenBus_Interrupt, Device);
james@0 347
james@95 348 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 349
james@0 350 return STATUS_SUCCESS;
james@0 351 }
james@0 352
james@0 353 NTSTATUS
andy@13 354 XenBus_Stop(WDFDEVICE Device)
james@0 355 {
andy@15 356 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 357 int i;
james@0 358
james@95 359 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@35 360
james@0 361 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@0 362 {
andy@38 363 if (xpdd->XenBus_WatchEntries[i].Active)
andy@38 364 XenBus_RemWatch(Device, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path,
andy@38 365 xpdd->XenBus_WatchEntries[i].ServiceRoutine,
andy@38 366 xpdd->XenBus_WatchEntries[i].ServiceContext);
james@0 367 }
james@0 368
andy@15 369 EvtChn_Unbind(Device, xpdd->xen_store_evtchn);
james@0 370
james@95 371 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@35 372
james@35 373 return STATUS_SUCCESS;
james@35 374 }
james@35 375
james@35 376 NTSTATUS
andy@37 377 XenBus_Close(WDFDEVICE Device)
james@35 378 {
andy@38 379 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@56 380 //KWAIT_BLOCK WaitBlockArray[2];
james@35 381 PVOID WaitArray[2];
james@35 382
andy@38 383 xpdd->XenBus_ShuttingDown = TRUE;
james@35 384
james@35 385 KdPrint((__DRIVER_NAME " Signalling Threads\n"));
andy@38 386 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
andy@38 387 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@35 388 KdPrint((__DRIVER_NAME " Waiting for threads to die\n"));
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 //KeWaitForMultipleObjects(1, &WaitArray[0], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 392 KdPrint((__DRIVER_NAME " Waiting for ReadThread\n"));
james@48 393 KeWaitForSingleObject(WaitArray[0], Executive, KernelMode, FALSE, NULL);
james@48 394 KdPrint((__DRIVER_NAME " Waiting for WatchThread\n"));
james@48 395 //KeWaitForMultipleObjects(1, &WaitArray[1], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 396 KeWaitForSingleObject(WaitArray[1], Executive, KernelMode, FALSE, NULL);
james@35 397 KdPrint((__DRIVER_NAME " Threads are dead\n"));
james@35 398
andy@38 399 xpdd->XenBus_ShuttingDown = FALSE;
james@35 400
james@48 401 // ObDereferenceObject(WaitArray[0]);
james@48 402 // ObDereferenceObject(WaitArray[1]);
james@48 403
james@48 404 KdPrint((__DRIVER_NAME " A\n"));
james@35 405
andy@15 406 ZwClose(xpdd->XenBus_WatchThreadHandle);
james@48 407
james@48 408 KdPrint((__DRIVER_NAME " B\n"));
james@48 409
andy@15 410 ZwClose(xpdd->XenBus_ReadThreadHandle);
james@0 411
james@95 412 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@35 413
james@0 414 return STATUS_SUCCESS;
james@0 415 }
james@0 416
james@0 417 char *
andy@13 418 XenBus_List(
andy@13 419 PVOID Context,
andy@13 420 xenbus_transaction_t xbt,
andy@13 421 const char *pre,
andy@13 422 char ***contents)
james@0 423 {
andy@13 424 WDFDEVICE Device = Context;
james@0 425 struct xsd_sockmsg *reply, *repmsg;
james@0 426 struct write_req req[] = { { pre, strlen(pre)+1 } };
james@0 427 ULONG nr_elems, x, i;
james@0 428 char **res;
james@0 429 char *msg;
james@0 430
james@95 431 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 432
andy@13 433 repmsg = xenbus_msg_reply(Device, XS_DIRECTORY, xbt, req, ARRAY_SIZE(req));
james@0 434 msg = errmsg(repmsg);
andy@15 435 if (msg)
andy@15 436 {
james@0 437 *contents = NULL;
james@95 438 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 439 return msg;
james@0 440 }
james@0 441 reply = repmsg + 1;
james@0 442 for (x = nr_elems = 0; x < repmsg->len; x++)
andy@15 443 {
james@0 444 nr_elems += (((char *)reply)[x] == 0);
andy@15 445 }
andy@15 446 res = ExAllocatePoolWithTag(NonPagedPool, sizeof(res[0]) * (nr_elems + 1),
andy@15 447 XENPCI_POOL_TAG);
andy@15 448 for (x = i = 0; i < nr_elems; i++)
andy@15 449 {
james@0 450 int l = strlen((char *)reply + x);
james@0 451 res[i] = ExAllocatePoolWithTag(NonPagedPool, l + 1, XENPCI_POOL_TAG);
james@0 452 memcpy(res[i], (char *)reply + x, l + 1);
james@0 453 x += l + 1;
james@0 454 }
james@0 455 res[i] = NULL;
james@0 456 ExFreePoolWithTag(repmsg, XENPCI_POOL_TAG);
james@0 457 *contents = res;
james@95 458 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 459 return NULL;
james@0 460 }
james@0 461
andy@15 462 static void
andy@15 463 XenBus_ReadThreadProc(PVOID StartContext)
james@0 464 {
james@0 465 int NewWriteIndex;
james@0 466 struct xsd_sockmsg msg;
james@0 467 char *payload;
james@0 468 char *path, *token;
andy@15 469 WDFDEVICE Device = StartContext;
andy@15 470 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 471
james@0 472 for(;;)
james@0 473 {
andy@15 474 KeWaitForSingleObject(&xpdd->XenBus_ReadThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 475 if (xpdd->XenBus_ShuttingDown)
james@35 476 {
james@35 477 KdPrint((__DRIVER_NAME " Shutdown detected in ReadThreadProc\n"));
james@35 478 PsTerminateSystemThread(0);
james@35 479 }
james@0 480 //KdPrint((__DRIVER_NAME " ReadThread Woken (Count = %d)\n", ReadThreadWaitCount++));
andy@15 481 while (xpdd->xen_store_interface->rsp_prod != xpdd->xen_store_interface->rsp_cons)
james@0 482 {
james@0 483 //KdPrint((__DRIVER_NAME " a - Rsp_cons %d, rsp_prod %d.\n", xen_store_interface->rsp_cons, xen_store_interface->rsp_prod));
andy@15 484 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg))
james@0 485 {
james@0 486 //KdPrint((__DRIVER_NAME " +++ Message incomplete (not even a full header)\n"));
james@0 487 break;
james@0 488 }
james@0 489 //_ReadBarrier();
james@0 490 KeMemoryBarrier();
andy@15 491 memcpy_from_ring(xpdd->xen_store_interface->rsp, &msg,
andy@15 492 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), sizeof(msg));
andy@15 493 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg) + msg.len)
james@0 494 {
james@0 495 //KdPrint((__DRIVER_NAME " +++ Message incomplete (header but not full body)\n"));
james@0 496 break;
james@0 497 }
james@0 498
andy@20 499 if (msg.type != XS_WATCH_EVENT)
andy@20 500 {
andy@20 501 xpdd->req_info[msg.req_id].Reply = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@20 502 memcpy_from_ring(xpdd->xen_store_interface->rsp,
andy@20 503 xpdd->req_info[msg.req_id].Reply,
andy@20 504 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons),
andy@20 505 msg.len + sizeof(msg));
andy@20 506 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
andy@20 507 KeSetEvent(&xpdd->req_info[msg.req_id].WaitEvent, 1, FALSE);
andy@20 508 }
andy@20 509 else // a watch: add to watch ring and signal watch thread
james@0 510 {
james@0 511 payload = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@15 512 memcpy_from_ring(xpdd->xen_store_interface->rsp, payload,
andy@15 513 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), msg.len + sizeof(msg));
andy@15 514 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
james@0 515 path = payload + sizeof(msg);
james@0 516 token = path + strlen(path) + 1;
james@0 517
andy@15 518 NewWriteIndex = (xpdd->XenBus_WatchRingWriteIndex + 1) & 127;
andy@15 519 if (NewWriteIndex != xpdd->XenBus_WatchRingReadIndex)
james@0 520 {
andy@15 521 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Path, path, 128);
andy@15 522 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Token, token, 10);
andy@15 523 xpdd->XenBus_WatchRingWriteIndex = NewWriteIndex;
james@0 524 }
james@0 525 else
james@0 526 {
james@0 527 KdPrint((__DRIVER_NAME " +++ Queue full Path = %s Token = %s\n", path, token));
james@0 528 // drop the message on the floor
james@0 529 continue;
james@0 530 }
james@0 531
james@0 532 ExFreePoolWithTag(payload, XENPCI_POOL_TAG);
james@0 533 //KdPrint((__DRIVER_NAME " +++ Watch Path = %s Token = %s\n", path, token));
andy@15 534 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@0 535 }
james@0 536 }
james@0 537 }
james@0 538 }
james@0 539
james@0 540 static void
james@0 541 XenBus_WatchThreadProc(PVOID StartContext)
james@0 542 {
james@0 543 int index;
james@0 544 PXENBUS_WATCH_ENTRY entry;
andy@15 545 WDFDEVICE Device = StartContext;
andy@15 546 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 547
james@0 548 for(;;)
james@0 549 {
andy@37 550 KeWaitForSingleObject(&xpdd->XenBus_WatchThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 551 if (xpdd->XenBus_ShuttingDown)
james@35 552 {
james@35 553 KdPrint((__DRIVER_NAME " Shutdown detected in WatchThreadProc\n"));
james@35 554 PsTerminateSystemThread(0);
james@35 555 }
andy@38 556 while (xpdd->XenBus_WatchRingReadIndex != xpdd->XenBus_WatchRingWriteIndex)
james@0 557 {
andy@15 558 xpdd->XenBus_WatchRingReadIndex =
andy@15 559 (xpdd->XenBus_WatchRingReadIndex + 1) % WATCH_RING_SIZE;
andy@15 560 index = atoi(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token);
james@0 561 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Path
james@0 562 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Token
james@0 563
andy@15 564 entry = &xpdd->XenBus_WatchEntries[index];
james@0 565 if (!entry->Active)
james@0 566 {
andy@15 567 KdPrint((__DRIVER_NAME " +++ Watch not active! = %s Token = %s\n",
andy@15 568 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 569 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 570 continue;
james@0 571 }
james@0 572 entry->Count++;
james@0 573 if (!entry->ServiceRoutine)
james@0 574 {
andy@15 575 KdPrint((__DRIVER_NAME " +++ no handler for watch! = %s Token = %s\n",
andy@15 576 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 577 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 578 continue;
james@0 579 }
james@0 580 //KdPrint((__DRIVER_NAME " +++ Watch Triggered Path = %s Token = %d (%s)\n", XenBus_WatchRing[XenBus_WatchRingReadIndex].Path, index, XenBus_WatchRing[XenBus_WatchRingReadIndex].Token));
andy@15 581 entry->ServiceRoutine(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path, entry->ServiceContext);
james@0 582 }
james@0 583 }
james@0 584 }
james@0 585
james@0 586 char *
andy@15 587 XenBus_AddWatch(
andy@13 588 PVOID Context,
andy@13 589 xenbus_transaction_t xbt,
andy@13 590 const char *Path,
andy@13 591 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 592 PVOID ServiceContext)
james@0 593 {
andy@13 594 WDFDEVICE Device = Context;
andy@15 595 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 596 struct xsd_sockmsg *rep;
james@0 597 char *msg;
james@0 598 int i;
james@0 599 char Token[20];
james@0 600 struct write_req req[2];
andy@94 601 PXENBUS_WATCH_ENTRY w_entry;
james@0 602
james@95 603 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 604
andy@94 605 ASSERT(strlen(Path) < ARRAY_SIZE(w_entry->Path));
james@0 606
james@0 607 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@15 608 if (xpdd->XenBus_WatchEntries[i].Active == 0)
james@0 609 break;
james@0 610
james@0 611 if (i == MAX_WATCH_ENTRIES)
james@0 612 {
james@0 613 KdPrint((__DRIVER_NAME " +++ No more watch slots left\n"));
james@0 614 return NULL;
james@0 615 }
james@0 616
andy@94 617 /* must init watchentry before starting watch */
andy@94 618 w_entry = &xpdd->XenBus_WatchEntries[i];
andy@94 619 strncpy(w_entry->Path, Path, ARRAY_SIZE(w_entry->Path));
andy@94 620 w_entry->ServiceRoutine = ServiceRoutine;
andy@94 621 w_entry->ServiceContext = ServiceContext;
andy@94 622 w_entry->Count = 0;
andy@94 623 w_entry->Active = 1;
andy@94 624
james@0 625 req[0].data = Path;
james@0 626 req[0].len = strlen(Path) + 1;
james@0 627
james@0 628 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 629 req[1].data = Token;
james@0 630 req[1].len = strlen(Token) + 1;
james@0 631
andy@93 632 rep = xenbus_msg_reply(Device, XS_WATCH, xbt, req, ARRAY_SIZE(req));
andy@93 633
andy@93 634 msg = errmsg(rep);
andy@93 635 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@93 636 if (msg)
andy@93 637 {
andy@93 638 xpdd->XenBus_WatchEntries[i].Active = 0;
james@96 639 KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch (%s)\n", msg));
andy@93 640 return msg;
andy@93 641 }
andy@93 642
james@95 643 KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch\n"));
james@0 644
james@0 645 return NULL;
james@0 646 }
james@0 647
james@0 648 char *
andy@13 649 XenBus_RemWatch(
andy@13 650 PVOID Context,
andy@13 651 xenbus_transaction_t xbt,
andy@13 652 const char *Path,
andy@13 653 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 654 PVOID ServiceContext)
james@0 655 {
andy@13 656 WDFDEVICE Device = Context;
andy@15 657 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 658 struct xsd_sockmsg *rep;
james@0 659 char *msg;
james@0 660 int i;
james@0 661 char Token[20];
james@0 662 struct write_req req[2];
james@0 663
james@95 664 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 665
james@0 666 // check that Path < 128 chars
james@0 667
james@0 668 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
andy@15 669 if (xpdd->XenBus_WatchEntries[i].Active == 1
andy@15 670 && strcmp(xpdd->XenBus_WatchEntries[i].Path, Path) == 0
andy@15 671 && xpdd->XenBus_WatchEntries[i].ServiceRoutine == ServiceRoutine
andy@15 672 && xpdd->XenBus_WatchEntries[i].ServiceContext == ServiceContext)
james@0 673 break;
james@0 674 }
james@0 675
james@0 676 if (i == MAX_WATCH_ENTRIES)
james@0 677 {
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@0 682 req[0].data = Path;
james@0 683 req[0].len = strlen(Path) + 1;
james@0 684
james@0 685 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 686 req[1].data = Token;
james@0 687 req[1].len = strlen(Token) + 1;
james@0 688
andy@13 689 rep = xenbus_msg_reply(Device, XS_UNWATCH, xbt, req, ARRAY_SIZE(req));
james@0 690
james@0 691 msg = errmsg(rep);
james@0 692 if (msg)
james@0 693 return msg;
james@0 694
james@0 695 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 696
andy@15 697 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 698
james@95 699 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 700
james@0 701 return NULL;
james@0 702 }
james@0 703
james@0 704
james@0 705 char *
andy@13 706 XenBus_StartTransaction(PVOID Context, xenbus_transaction_t *xbt)
james@0 707 {
andy@13 708 WDFDEVICE Device = Context;
james@0 709 /* xenstored becomes angry if you send a length 0 message, so just
james@0 710 shove a nul terminator on the end */
james@0 711 struct write_req req = { "", 1};
james@0 712 struct xsd_sockmsg *rep;
james@0 713 char *err;
james@0 714
james@95 715 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 716
andy@13 717 rep = xenbus_msg_reply(Device, XS_TRANSACTION_START, 0, &req, 1);
james@0 718 err = errmsg(rep);
james@0 719 if (err)
james@0 720 return err;
james@0 721 *xbt = atoi((char *)(rep + 1));
james@0 722 //sscanf((char *)(rep + 1), "%u", xbt);
james@0 723 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 724
james@95 725 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 726
james@0 727 return NULL;
james@0 728 }
james@0 729
james@0 730 char *
andy@15 731 XenBus_EndTransaction(
andy@15 732 PVOID Context,
andy@15 733 xenbus_transaction_t t,
andy@15 734 int abort,
andy@15 735 int *retry)
james@0 736 {
andy@13 737 WDFDEVICE Device = Context;
james@0 738 struct xsd_sockmsg *rep;
james@0 739 struct write_req req;
james@0 740 char *err;
james@0 741
james@95 742 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 743
james@0 744 *retry = 0;
james@0 745
james@0 746 req.data = abort ? "F" : "T";
james@0 747 req.len = 2;
andy@13 748 rep = xenbus_msg_reply(Device, XS_TRANSACTION_END, t, &req, 1);
james@0 749 err = errmsg(rep);
james@0 750 if (err) {
james@0 751 if (!strcmp(err, "EAGAIN")) {
james@0 752 *retry = 1;
james@0 753 ExFreePoolWithTag(err, XENPCI_POOL_TAG);
james@0 754 return NULL;
james@0 755 } else {
james@0 756 return err;
james@0 757 }
james@0 758 }
james@0 759 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 760
james@95 761 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 762
james@0 763 return NULL;
james@0 764 }
james@0 765
james@0 766 static BOOLEAN
james@0 767 XenBus_Interrupt(PKINTERRUPT Interrupt, PVOID ServiceContext)
james@0 768 {
andy@15 769 WDFDEVICE Device = ServiceContext;
andy@15 770 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 771
james@0 772 UNREFERENCED_PARAMETER(Interrupt);
james@0 773
james@95 774 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 775
andy@15 776 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
james@0 777
james@95 778 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@0 779
james@0 780 return TRUE;
james@0 781 }
james@0 782
james@0 783 char *
andy@15 784 XenBus_Printf(
andy@15 785 PVOID Context,
andy@15 786 xenbus_transaction_t xbt,
andy@15 787 const char *path,
andy@15 788 const char *fmt,
andy@15 789 ...)
james@0 790 {
andy@13 791 WDFDEVICE Device = Context;
james@0 792 va_list ap;
andy@101 793 char buf[512];
james@95 794 char *retval;
james@95 795
james@95 796 KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@0 797
james@0 798 va_start(ap, fmt);
james@0 799 RtlStringCbVPrintfA(buf, ARRAY_SIZE(buf), fmt, ap);
james@0 800 va_end(ap);
james@95 801 retval = XenBus_Write(Device, xbt, path, buf);
james@95 802
james@95 803 KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 804
james@95 805 return retval;
andy@37 806 }