win-pvdrivers

annotate xenpci/xenbus.c @ 89:5f69bcb9090c

exec xenbus_interrupt at dispatch because it calls KeSetEvent
author Andy Grover <andy.grover@oracle.com>
date Wed Jan 02 14:10:35 2008 -0800 (2008-01-02)
parents b1f7c8a9eb17
children 2a2f98373c9a
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@0 46 //KdPrint((__DRIVER_NAME " --> allocate_xenbus_id\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@0 73 //KdPrint((__DRIVER_NAME " <-- allocate_xenbus_id\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@0 143 //KdPrint((__DRIVER_NAME " --> xb_write\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@0 208 //KdPrint((__DRIVER_NAME " <-- xb_write\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 // DEFINE_WAIT(w);
james@0 222 struct xsd_sockmsg *rep;
james@0 223
james@35 224 // KdPrint((__DRIVER_NAME " --> xenbus_msg_reply\n"));
james@0 225
andy@15 226 id = allocate_xenbus_id(Device);
james@0 227 // add_waiter(w, req_info[id].waitq);
james@0 228
andy@13 229 xb_write(Device, type, id, trans, io, nr_reqs);
james@0 230 //
james@0 231 // schedule();
james@0 232 // remove_waiter(w);
james@0 233 // wake(current);
james@0 234 //
james@35 235 // KdPrint((__DRIVER_NAME " starting wait\n"));
james@0 236
andy@15 237 KeWaitForSingleObject(&xpdd->req_info[id].WaitEvent, Executive, KernelMode, FALSE, NULL);
james@0 238
james@9 239 //KdPrint((__DRIVER_NAME " wait complete\n"));
james@0 240
andy@15 241 rep = xpdd->req_info[id].Reply;
james@0 242 // BUG_ON(rep->req_id != id);
andy@15 243 release_xenbus_id(Device, id);
james@35 244 // KdPrint((__DRIVER_NAME " <-- xenbus_msg_reply\n"));
james@0 245 return rep;
james@0 246 }
james@0 247
james@0 248 char *
andy@15 249 XenBus_Read(
andy@13 250 PVOID Context,
andy@13 251 xenbus_transaction_t xbt,
andy@13 252 const char *path,
andy@13 253 char **value)
james@0 254 {
andy@13 255 WDFDEVICE Device = Context;
andy@13 256 struct write_req req[] = { {path, strlen(path) + 1} };
andy@13 257 struct xsd_sockmsg *rep;
andy@13 258 char *res;
andy@13 259 char *msg;
james@0 260
andy@13 261 rep = xenbus_msg_reply(Device, XS_READ, xbt, req, ARRAY_SIZE(req));
andy@13 262 msg = errmsg(rep);
andy@13 263 if (msg) {
andy@13 264 *value = NULL;
andy@13 265 return msg;
andy@13 266 }
andy@13 267 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
andy@13 268 memcpy(res, rep + 1, rep->len);
andy@13 269 res[rep->len] = 0;
andy@13 270 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 271 *value = res;
andy@13 272 return NULL;
james@0 273 }
james@0 274
james@0 275 char *
andy@13 276 XenBus_Write(
andy@13 277 PVOID Context,
andy@13 278 xenbus_transaction_t xbt,
andy@13 279 const char *path,
andy@13 280 const char *value)
james@0 281 {
andy@13 282 WDFDEVICE Device = Context;
andy@13 283 struct write_req req[] = {
andy@13 284 {path, strlen(path) + 1},
andy@13 285 {value, strlen(value) + 1},
andy@13 286 };
andy@13 287 struct xsd_sockmsg *rep;
andy@13 288 char *msg;
james@0 289
andy@13 290 rep = xenbus_msg_reply(Device, XS_WRITE, xbt, req, ARRAY_SIZE(req));
andy@13 291 msg = errmsg(rep);
andy@13 292 if (msg)
andy@13 293 return msg;
andy@13 294 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 295 return NULL;
james@0 296 }
james@0 297
james@0 298 NTSTATUS
andy@13 299 XenBus_Init(WDFDEVICE Device)
james@0 300 {
andy@37 301 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@35 302 NTSTATUS Status;
james@35 303 int i;
andy@37 304
james@0 305 //KdPrint((__DRIVER_NAME " --> XenBus_Init\n"));
james@35 306
andy@15 307 xpdd->xen_store_evtchn = EvtChn_GetXenStorePort(Device);
andy@15 308 xpdd->xen_store_interface = EvtChn_GetXenStoreRingAddr(Device);
james@0 309
james@35 310 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@38 311 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 312
andy@15 313 KeInitializeEvent(&xpdd->XenBus_ReadThreadEvent, SynchronizationEvent, FALSE);
andy@15 314 KeInitializeEvent(&xpdd->XenBus_WatchThreadEvent, SynchronizationEvent, FALSE);
andy@38 315 xpdd->XenBus_ShuttingDown = FALSE;
james@0 316
james@35 317 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 318 //Status = PsCreateSystemThread(&XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_ReadThreadProc, NULL);
andy@41 319 Status = PsCreateSystemThread(&xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_ReadThreadProc, Device);
james@35 320
james@35 321 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 322 //Status = PsCreateSystemThread(&XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_WatchThreadProc, NULL);
andy@41 323 Status = PsCreateSystemThread(&xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_WatchThreadProc, Device);
james@35 324
james@35 325 KdPrint((__DRIVER_NAME " <-- XenBus_Init\n"));
james@0 326
james@0 327 return STATUS_SUCCESS;
james@0 328 }
james@0 329
james@0 330 NTSTATUS
andy@13 331 XenBus_Start(WDFDEVICE Device)
james@0 332 {
andy@38 333 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@38 334
james@6 335 KdPrint((__DRIVER_NAME " --> XenBus_Start\n"));
james@0 336
andy@89 337 EvtChn_BindDpc(Device, xpdd->xen_store_evtchn, XenBus_Interrupt, Device);
james@0 338
james@6 339 KdPrint((__DRIVER_NAME " <-- XenBus_Start\n"));
james@0 340
james@0 341 return STATUS_SUCCESS;
james@0 342 }
james@0 343
james@0 344 NTSTATUS
andy@13 345 XenBus_Stop(WDFDEVICE Device)
james@0 346 {
andy@15 347 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 348 int i;
james@0 349
james@35 350 KdPrint((__DRIVER_NAME " --> XenBus_Stop\n"));
james@35 351
james@0 352 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@0 353 {
andy@38 354 if (xpdd->XenBus_WatchEntries[i].Active)
andy@38 355 XenBus_RemWatch(Device, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path,
andy@38 356 xpdd->XenBus_WatchEntries[i].ServiceRoutine,
andy@38 357 xpdd->XenBus_WatchEntries[i].ServiceContext);
james@0 358 }
james@0 359
andy@15 360 EvtChn_Unbind(Device, xpdd->xen_store_evtchn);
james@0 361
james@35 362 KdPrint((__DRIVER_NAME " <-- XenBus_Stop\n"));
james@35 363
james@35 364 return STATUS_SUCCESS;
james@35 365 }
james@35 366
james@35 367 NTSTATUS
andy@37 368 XenBus_Close(WDFDEVICE Device)
james@35 369 {
andy@38 370 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@56 371 //KWAIT_BLOCK WaitBlockArray[2];
james@35 372 PVOID WaitArray[2];
james@35 373
andy@38 374 xpdd->XenBus_ShuttingDown = TRUE;
james@35 375
james@35 376 KdPrint((__DRIVER_NAME " Signalling Threads\n"));
andy@38 377 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
andy@38 378 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@35 379 KdPrint((__DRIVER_NAME " Waiting for threads to die\n"));
andy@38 380 ObReferenceObjectByHandle(xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[0], NULL);
andy@38 381 ObReferenceObjectByHandle(xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[1], NULL);
james@48 382 //KeWaitForMultipleObjects(1, &WaitArray[0], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 383 KdPrint((__DRIVER_NAME " Waiting for ReadThread\n"));
james@48 384 KeWaitForSingleObject(WaitArray[0], Executive, KernelMode, FALSE, NULL);
james@48 385 KdPrint((__DRIVER_NAME " Waiting for WatchThread\n"));
james@48 386 //KeWaitForMultipleObjects(1, &WaitArray[1], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 387 KeWaitForSingleObject(WaitArray[1], Executive, KernelMode, FALSE, NULL);
james@35 388 KdPrint((__DRIVER_NAME " Threads are dead\n"));
james@35 389
andy@38 390 xpdd->XenBus_ShuttingDown = FALSE;
james@35 391
james@48 392 // ObDereferenceObject(WaitArray[0]);
james@48 393 // ObDereferenceObject(WaitArray[1]);
james@48 394
james@48 395 KdPrint((__DRIVER_NAME " A\n"));
james@35 396
andy@15 397 ZwClose(xpdd->XenBus_WatchThreadHandle);
james@48 398
james@48 399 KdPrint((__DRIVER_NAME " B\n"));
james@48 400
andy@15 401 ZwClose(xpdd->XenBus_ReadThreadHandle);
james@0 402
james@35 403 KdPrint((__DRIVER_NAME " <-- XenBus_Close\n"));
james@35 404
james@0 405 return STATUS_SUCCESS;
james@0 406 }
james@0 407
james@0 408 char *
andy@13 409 XenBus_List(
andy@13 410 PVOID Context,
andy@13 411 xenbus_transaction_t xbt,
andy@13 412 const char *pre,
andy@13 413 char ***contents)
james@0 414 {
andy@13 415 WDFDEVICE Device = Context;
james@0 416 struct xsd_sockmsg *reply, *repmsg;
james@0 417 struct write_req req[] = { { pre, strlen(pre)+1 } };
james@0 418 ULONG nr_elems, x, i;
james@0 419 char **res;
james@0 420 char *msg;
james@0 421
james@0 422 //KdPrint((__DRIVER_NAME " --> xenbus_ls\n"));
james@0 423
andy@13 424 repmsg = xenbus_msg_reply(Device, XS_DIRECTORY, xbt, req, ARRAY_SIZE(req));
james@0 425 msg = errmsg(repmsg);
andy@15 426 if (msg)
andy@15 427 {
james@0 428 *contents = NULL;
james@0 429 //KdPrint((__DRIVER_NAME " <-- xenbus_ls (error)\n"));
james@0 430 return msg;
james@0 431 }
james@0 432 reply = repmsg + 1;
james@0 433 for (x = nr_elems = 0; x < repmsg->len; x++)
andy@15 434 {
james@0 435 nr_elems += (((char *)reply)[x] == 0);
andy@15 436 }
andy@15 437 res = ExAllocatePoolWithTag(NonPagedPool, sizeof(res[0]) * (nr_elems + 1),
andy@15 438 XENPCI_POOL_TAG);
andy@15 439 for (x = i = 0; i < nr_elems; i++)
andy@15 440 {
james@0 441 int l = strlen((char *)reply + x);
james@0 442 res[i] = ExAllocatePoolWithTag(NonPagedPool, l + 1, XENPCI_POOL_TAG);
james@0 443 memcpy(res[i], (char *)reply + x, l + 1);
james@0 444 x += l + 1;
james@0 445 }
james@0 446 res[i] = NULL;
james@0 447 ExFreePoolWithTag(repmsg, XENPCI_POOL_TAG);
james@0 448 *contents = res;
james@0 449 //KdPrint((__DRIVER_NAME " <-- xenbus_ls\n"));
james@0 450 return NULL;
james@0 451 }
james@0 452
andy@15 453 static void
andy@15 454 XenBus_ReadThreadProc(PVOID StartContext)
james@0 455 {
james@0 456 int NewWriteIndex;
james@0 457 struct xsd_sockmsg msg;
james@0 458 char *payload;
james@0 459 char *path, *token;
andy@15 460 WDFDEVICE Device = StartContext;
andy@15 461 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 462
james@0 463 for(;;)
james@0 464 {
andy@15 465 KeWaitForSingleObject(&xpdd->XenBus_ReadThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 466 if (xpdd->XenBus_ShuttingDown)
james@35 467 {
james@35 468 KdPrint((__DRIVER_NAME " Shutdown detected in ReadThreadProc\n"));
james@35 469 PsTerminateSystemThread(0);
james@35 470 }
james@0 471 //KdPrint((__DRIVER_NAME " ReadThread Woken (Count = %d)\n", ReadThreadWaitCount++));
andy@15 472 while (xpdd->xen_store_interface->rsp_prod != xpdd->xen_store_interface->rsp_cons)
james@0 473 {
james@0 474 //KdPrint((__DRIVER_NAME " a - Rsp_cons %d, rsp_prod %d.\n", xen_store_interface->rsp_cons, xen_store_interface->rsp_prod));
andy@15 475 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg))
james@0 476 {
james@0 477 //KdPrint((__DRIVER_NAME " +++ Message incomplete (not even a full header)\n"));
james@0 478 break;
james@0 479 }
james@0 480 //_ReadBarrier();
james@0 481 KeMemoryBarrier();
andy@15 482 memcpy_from_ring(xpdd->xen_store_interface->rsp, &msg,
andy@15 483 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), sizeof(msg));
andy@15 484 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg) + msg.len)
james@0 485 {
james@0 486 //KdPrint((__DRIVER_NAME " +++ Message incomplete (header but not full body)\n"));
james@0 487 break;
james@0 488 }
james@0 489
andy@20 490 if (msg.type != XS_WATCH_EVENT)
andy@20 491 {
andy@20 492 xpdd->req_info[msg.req_id].Reply = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@20 493 memcpy_from_ring(xpdd->xen_store_interface->rsp,
andy@20 494 xpdd->req_info[msg.req_id].Reply,
andy@20 495 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons),
andy@20 496 msg.len + sizeof(msg));
andy@20 497 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
andy@20 498 KeSetEvent(&xpdd->req_info[msg.req_id].WaitEvent, 1, FALSE);
andy@20 499 }
andy@20 500 else // a watch: add to watch ring and signal watch thread
james@0 501 {
james@0 502 payload = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@15 503 memcpy_from_ring(xpdd->xen_store_interface->rsp, payload,
andy@15 504 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), msg.len + sizeof(msg));
andy@15 505 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
james@0 506 path = payload + sizeof(msg);
james@0 507 token = path + strlen(path) + 1;
james@0 508
andy@15 509 NewWriteIndex = (xpdd->XenBus_WatchRingWriteIndex + 1) & 127;
andy@15 510 if (NewWriteIndex != xpdd->XenBus_WatchRingReadIndex)
james@0 511 {
andy@15 512 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Path, path, 128);
andy@15 513 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Token, token, 10);
andy@15 514 xpdd->XenBus_WatchRingWriteIndex = NewWriteIndex;
james@0 515 }
james@0 516 else
james@0 517 {
james@0 518 KdPrint((__DRIVER_NAME " +++ Queue full Path = %s Token = %s\n", path, token));
james@0 519 // drop the message on the floor
james@0 520 continue;
james@0 521 }
james@0 522
james@0 523 ExFreePoolWithTag(payload, XENPCI_POOL_TAG);
james@0 524 //KdPrint((__DRIVER_NAME " +++ Watch Path = %s Token = %s\n", path, token));
andy@15 525 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@0 526 }
james@0 527 }
james@0 528 }
james@0 529 }
james@0 530
james@0 531 static void
james@0 532 XenBus_WatchThreadProc(PVOID StartContext)
james@0 533 {
james@0 534 int index;
james@0 535 PXENBUS_WATCH_ENTRY entry;
andy@15 536 WDFDEVICE Device = StartContext;
andy@15 537 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 538
james@0 539 for(;;)
james@0 540 {
andy@37 541 KeWaitForSingleObject(&xpdd->XenBus_WatchThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 542 if (xpdd->XenBus_ShuttingDown)
james@35 543 {
james@35 544 KdPrint((__DRIVER_NAME " Shutdown detected in WatchThreadProc\n"));
james@35 545 PsTerminateSystemThread(0);
james@35 546 }
andy@38 547 while (xpdd->XenBus_WatchRingReadIndex != xpdd->XenBus_WatchRingWriteIndex)
james@0 548 {
andy@15 549 xpdd->XenBus_WatchRingReadIndex =
andy@15 550 (xpdd->XenBus_WatchRingReadIndex + 1) % WATCH_RING_SIZE;
andy@15 551 index = atoi(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token);
james@0 552 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Path
james@0 553 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Token
james@0 554
andy@15 555 entry = &xpdd->XenBus_WatchEntries[index];
james@0 556 if (!entry->Active)
james@0 557 {
andy@15 558 KdPrint((__DRIVER_NAME " +++ Watch not active! = %s Token = %s\n",
andy@15 559 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 560 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 561 continue;
james@0 562 }
james@0 563 entry->Count++;
james@0 564 if (!entry->ServiceRoutine)
james@0 565 {
andy@15 566 KdPrint((__DRIVER_NAME " +++ no handler for watch! = %s Token = %s\n",
andy@15 567 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 568 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 569 continue;
james@0 570 }
james@0 571 //KdPrint((__DRIVER_NAME " +++ Watch Triggered Path = %s Token = %d (%s)\n", XenBus_WatchRing[XenBus_WatchRingReadIndex].Path, index, XenBus_WatchRing[XenBus_WatchRingReadIndex].Token));
andy@15 572 entry->ServiceRoutine(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path, entry->ServiceContext);
james@0 573 }
james@0 574 }
james@0 575 }
james@0 576
james@0 577 char *
andy@15 578 XenBus_AddWatch(
andy@13 579 PVOID Context,
andy@13 580 xenbus_transaction_t xbt,
andy@13 581 const char *Path,
andy@13 582 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 583 PVOID ServiceContext)
james@0 584 {
andy@13 585 WDFDEVICE Device = Context;
andy@15 586 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 587 struct xsd_sockmsg *rep;
james@0 588 char *msg;
james@0 589 int i;
james@0 590 char Token[20];
james@0 591 struct write_req req[2];
james@0 592
james@35 593 // KdPrint((__DRIVER_NAME " --> XenBus_AddWatch\n"));
james@0 594
james@0 595 // check that Path < 128 chars
james@0 596
james@0 597 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@15 598 if (xpdd->XenBus_WatchEntries[i].Active == 0)
james@0 599 break;
james@0 600
james@0 601 if (i == MAX_WATCH_ENTRIES)
james@0 602 {
james@0 603 KdPrint((__DRIVER_NAME " +++ No more watch slots left\n"));
james@0 604 return NULL;
james@0 605 }
james@0 606
james@0 607 req[0].data = Path;
james@0 608 req[0].len = strlen(Path) + 1;
james@0 609
james@0 610 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 611 req[1].data = Token;
james@0 612 req[1].len = strlen(Token) + 1;
james@0 613
andy@13 614 rep = xenbus_msg_reply(Device, XS_WATCH, xbt, req, ARRAY_SIZE(req));
james@0 615
james@0 616 msg = errmsg(rep);
james@0 617 if (msg)
james@0 618 return msg;
james@0 619
james@0 620 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 621
andy@15 622 strncpy(xpdd->XenBus_WatchEntries[i].Path, Path, 128);
andy@15 623 xpdd->XenBus_WatchEntries[i].ServiceRoutine = ServiceRoutine;
andy@15 624 xpdd->XenBus_WatchEntries[i].ServiceContext = ServiceContext;
andy@15 625 xpdd->XenBus_WatchEntries[i].Count = 0;
andy@15 626 xpdd->XenBus_WatchEntries[i].Active = 1;
james@0 627
james@35 628 // KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch\n"));
james@0 629
james@0 630 return NULL;
james@0 631 }
james@0 632
james@0 633 char *
andy@13 634 XenBus_RemWatch(
andy@13 635 PVOID Context,
andy@13 636 xenbus_transaction_t xbt,
andy@13 637 const char *Path,
andy@13 638 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 639 PVOID ServiceContext)
james@0 640 {
andy@13 641 WDFDEVICE Device = Context;
andy@15 642 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 643 struct xsd_sockmsg *rep;
james@0 644 char *msg;
james@0 645 int i;
james@0 646 char Token[20];
james@0 647 struct write_req req[2];
james@0 648
james@0 649 //KdPrint((__DRIVER_NAME " --> XenBus_RemWatch\n"));
james@0 650
james@0 651 // check that Path < 128 chars
james@0 652
james@0 653 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
andy@15 654 if (xpdd->XenBus_WatchEntries[i].Active == 1
andy@15 655 && strcmp(xpdd->XenBus_WatchEntries[i].Path, Path) == 0
andy@15 656 && xpdd->XenBus_WatchEntries[i].ServiceRoutine == ServiceRoutine
andy@15 657 && xpdd->XenBus_WatchEntries[i].ServiceContext == ServiceContext)
james@0 658 break;
james@0 659 }
james@0 660
james@0 661 if (i == MAX_WATCH_ENTRIES)
james@0 662 {
james@0 663 KdPrint((__DRIVER_NAME " Watch not set - can't remove\n"));
james@0 664 return NULL;
james@0 665 }
james@0 666
james@0 667 req[0].data = Path;
james@0 668 req[0].len = strlen(Path) + 1;
james@0 669
james@0 670 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 671 req[1].data = Token;
james@0 672 req[1].len = strlen(Token) + 1;
james@0 673
andy@13 674 rep = xenbus_msg_reply(Device, XS_UNWATCH, xbt, req, ARRAY_SIZE(req));
james@0 675
james@0 676 msg = errmsg(rep);
james@0 677 if (msg)
james@0 678 return msg;
james@0 679
james@0 680 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 681
andy@15 682 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 683
james@0 684 //KdPrint((__DRIVER_NAME " <-- XenBus_RemWatch\n"));
james@0 685
james@0 686 return NULL;
james@0 687 }
james@0 688
james@0 689
james@0 690 char *
andy@13 691 XenBus_StartTransaction(PVOID Context, xenbus_transaction_t *xbt)
james@0 692 {
andy@13 693 WDFDEVICE Device = Context;
james@0 694 /* xenstored becomes angry if you send a length 0 message, so just
james@0 695 shove a nul terminator on the end */
james@0 696 struct write_req req = { "", 1};
james@0 697 struct xsd_sockmsg *rep;
james@0 698 char *err;
james@0 699
andy@13 700 rep = xenbus_msg_reply(Device, XS_TRANSACTION_START, 0, &req, 1);
james@0 701 err = errmsg(rep);
james@0 702 if (err)
james@0 703 return err;
james@0 704 *xbt = atoi((char *)(rep + 1));
james@0 705 //sscanf((char *)(rep + 1), "%u", xbt);
james@0 706 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 707 return NULL;
james@0 708 }
james@0 709
james@0 710 char *
andy@15 711 XenBus_EndTransaction(
andy@15 712 PVOID Context,
andy@15 713 xenbus_transaction_t t,
andy@15 714 int abort,
andy@15 715 int *retry)
james@0 716 {
andy@13 717 WDFDEVICE Device = Context;
james@0 718 struct xsd_sockmsg *rep;
james@0 719 struct write_req req;
james@0 720 char *err;
james@0 721
james@0 722 *retry = 0;
james@0 723
james@0 724 req.data = abort ? "F" : "T";
james@0 725 req.len = 2;
andy@13 726 rep = xenbus_msg_reply(Device, XS_TRANSACTION_END, t, &req, 1);
james@0 727 err = errmsg(rep);
james@0 728 if (err) {
james@0 729 if (!strcmp(err, "EAGAIN")) {
james@0 730 *retry = 1;
james@0 731 ExFreePoolWithTag(err, XENPCI_POOL_TAG);
james@0 732 return NULL;
james@0 733 } else {
james@0 734 return err;
james@0 735 }
james@0 736 }
james@0 737 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 738 return NULL;
james@0 739 }
james@0 740
james@0 741 static BOOLEAN
james@0 742 XenBus_Interrupt(PKINTERRUPT Interrupt, PVOID ServiceContext)
james@0 743 {
andy@15 744 WDFDEVICE Device = ServiceContext;
andy@15 745 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 746
james@0 747 UNREFERENCED_PARAMETER(Interrupt);
james@0 748
james@0 749 //KdPrint((__DRIVER_NAME " --> XenBus_Interrupt (Count = %d)\n", ReadThreadSetCount++));
james@0 750
andy@15 751 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
james@0 752
james@0 753 //KdPrint((__DRIVER_NAME " <-- XenBus_Interrupt\n"));
james@0 754
james@0 755 return TRUE;
james@0 756 }
james@0 757
james@0 758 char *
andy@15 759 XenBus_Printf(
andy@15 760 PVOID Context,
andy@15 761 xenbus_transaction_t xbt,
andy@15 762 const char *path,
andy@15 763 const char *fmt,
andy@15 764 ...)
james@0 765 {
andy@13 766 WDFDEVICE Device = Context;
james@0 767 va_list ap;
james@0 768 char buf[1024];
james@0 769
james@0 770 va_start(ap, fmt);
james@0 771 RtlStringCbVPrintfA(buf, ARRAY_SIZE(buf), fmt, ap);
james@0 772 va_end(ap);
andy@13 773 return XenBus_Write(Device, xbt, path, buf);
andy@37 774 }