win-pvdrivers

annotate xenpci/xenbus.c @ 1022:cd72cd0e1c19

find changesets by author, revision, files, or words in the commit message
hooking debug doesn't survive hibernate under win8. Remove it.
Remove initial balloon down - doesn't work under xen 4.2 without xenbus being loaded
author James Harper <james.harper@bendigoit.com.au>
date Tue Feb 19 15:11:49 2013 +1100 (2013-02-19)
parents df03fde445b8
children 37c0c84a42e8
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 <stdlib.h>
james@0 22
james@0 23 #pragma warning( disable : 4204 )
james@0 24 #pragma warning( disable : 4221 )
james@0 25
james@716 26 /* Not really necessary but keeps PREfast happy */
james@716 27 static EVT_WDF_WORKITEM XenBus_WatchWorkItemProc;
james@716 28
james@624 29 WDF_DECLARE_CONTEXT_TYPE(xsd_sockmsg_t)
james@624 30
andy@15 31 struct write_req {
james@504 32 void *data;
andy@15 33 unsigned len;
james@0 34 };
james@0 35
james@157 36 // This routine free's the rep structure if there was an error!!!
james@0 37 static char *errmsg(struct xsd_sockmsg *rep)
james@0 38 {
james@0 39 char *res;
andy@15 40
james@0 41 if (!rep) {
james@0 42 char msg[] = "No reply";
james@0 43 size_t len = strlen(msg) + 1;
james@0 44 return memcpy(ExAllocatePoolWithTag(NonPagedPool, len, XENPCI_POOL_TAG), msg, len);
james@0 45 }
james@0 46 if (rep->type != XS_ERROR)
james@0 47 return NULL;
james@0 48 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
james@0 49 memcpy(res, rep + 1, rep->len);
james@0 50 res[rep->len] = 0;
james@0 51 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 52 return res;
james@0 53 }
james@0 54
james@504 55 static void memcpy_from_ring(void *Ring,
james@0 56 void *Dest,
james@0 57 int off,
james@0 58 int len)
james@0 59 {
james@0 60 int c1, c2;
james@504 61 char *ring = Ring;
james@0 62 char *dest = Dest;
james@0 63 c1 = min(len, XENSTORE_RING_SIZE - off);
james@0 64 c2 = len - c1;
james@0 65 memcpy(dest, ring + off, c1);
james@0 66 memcpy(dest + c1, ring, c2);
james@0 67 }
james@0 68
james@404 69 /* called with xenbus_mutex held */
andy@15 70 static void xb_write(
james@258 71 PXENPCI_DEVICE_DATA xpdd,
james@504 72 PVOID data,
james@504 73 ULONG len
james@504 74 )
james@0 75 {
james@0 76 XENSTORE_RING_IDX prod;
james@504 77 ULONG copy_len;
james@504 78 PUCHAR ptr;
james@504 79 ULONG remaining;
james@504 80
james@523 81 //FUNCTION_ENTER();
james@0 82
james@1022 83 XN_ASSERT(len <= XENSTORE_RING_SIZE);
andy@15 84 prod = xpdd->xen_store_interface->req_prod;
james@504 85 ptr = data;
james@504 86 remaining = len;
james@504 87 while (remaining)
james@0 88 {
james@504 89 copy_len = min(remaining, XENSTORE_RING_SIZE - MASK_XENSTORE_IDX(prod));
james@504 90 memcpy((PUCHAR)xpdd->xen_store_interface->req + MASK_XENSTORE_IDX(prod), ptr, copy_len);
james@504 91 prod += (XENSTORE_RING_IDX)copy_len;
james@504 92 ptr += copy_len;
james@504 93 remaining -= copy_len;
james@0 94 }
james@0 95 /* Remote must see entire message before updating indexes */
james@0 96 KeMemoryBarrier();
james@504 97 xpdd->xen_store_interface->req_prod = prod;
james@1005 98 EvtChn_Notify(xpdd, xpdd->xenbus_event);
james@0 99
james@523 100 //FUNCTION_EXIT();
james@0 101 }
james@0 102
james@504 103 /* takes and releases xb_request_mutex */
james@0 104 static struct xsd_sockmsg *
james@504 105 xenbus_format_msg_reply(
james@258 106 PXENPCI_DEVICE_DATA xpdd,
andy@13 107 int type,
james@504 108 xenbus_transaction_t trans_id,
james@504 109 struct write_req *req,
andy@13 110 int nr_reqs)
james@0 111 {
james@504 112 struct xsd_sockmsg msg;
james@504 113 struct xsd_sockmsg *reply;
james@504 114 int i;
andy@94 115
james@529 116 //FUNCTION_ENTER();
james@504 117
james@504 118 msg.type = type;
james@504 119 msg.req_id = 0;
james@504 120 msg.tx_id = trans_id;
james@504 121 msg.len = 0;
james@504 122 for (i = 0; i < nr_reqs; i++)
james@515 123 msg.len += req[i].len;
james@95 124
james@504 125 ExAcquireFastMutex(&xpdd->xb_request_mutex);
james@504 126 xb_write(xpdd, &msg, sizeof(msg));
james@504 127 for (i = 0; i < nr_reqs; i++)
james@504 128 xb_write(xpdd, req[i].data, req[i].len);
james@0 129
james@504 130 KeWaitForSingleObject(&xpdd->xb_request_complete_event, Executive, KernelMode, FALSE, NULL);
james@504 131 reply = xpdd->xb_reply;
james@504 132 xpdd->xb_reply = NULL;
james@512 133 ExReleaseFastMutex(&xpdd->xb_request_mutex);
james@96 134
james@529 135 //FUNCTION_EXIT();
james@504 136
james@504 137 return reply;
james@504 138 }
james@504 139
james@504 140 /* takes and releases xb_request_mutex */
james@504 141 struct xsd_sockmsg *
james@504 142 XenBus_Raw(
james@504 143 PXENPCI_DEVICE_DATA xpdd,
james@504 144 struct xsd_sockmsg *msg)
james@504 145 {
james@504 146 struct xsd_sockmsg *reply;
james@536 147
james@624 148 //FUNCTION_ENTER();
james@504 149
james@504 150 ExAcquireFastMutex(&xpdd->xb_request_mutex);
james@504 151 xb_write(xpdd, msg, sizeof(struct xsd_sockmsg) + msg->len);
james@504 152 KeWaitForSingleObject(&xpdd->xb_request_complete_event, Executive, KernelMode, FALSE, NULL);
james@504 153 reply = xpdd->xb_reply;
james@504 154 xpdd->xb_reply = NULL;
james@504 155 ExReleaseFastMutex(&xpdd->xb_request_mutex);
james@504 156
james@624 157 //FUNCTION_EXIT();
james@536 158
james@504 159 return reply;
james@0 160 }
james@0 161
james@624 162 /* Called at PASSIVE_LEVEL */
james@0 163 char *
andy@15 164 XenBus_Read(
andy@13 165 PVOID Context,
andy@13 166 xenbus_transaction_t xbt,
james@504 167 char *path,
andy@13 168 char **value)
james@0 169 {
james@258 170 PXENPCI_DEVICE_DATA xpdd = Context;
james@145 171 struct write_req req[] = { {path, (ULONG)strlen(path) + 1} };
andy@13 172 struct xsd_sockmsg *rep;
andy@13 173 char *res;
andy@13 174 char *msg;
james@0 175
james@342 176 //KdPrint((__DRIVER_NAME " --> " __FUNCTION__ "\n"));
james@95 177
james@1022 178 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@272 179
james@504 180 rep = xenbus_format_msg_reply(xpdd, XS_READ, xbt, req, ARRAY_SIZE(req));
andy@13 181 msg = errmsg(rep);
andy@13 182 if (msg) {
andy@13 183 *value = NULL;
andy@13 184 return msg;
andy@13 185 }
andy@13 186 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
andy@13 187 memcpy(res, rep + 1, rep->len);
andy@13 188 res[rep->len] = 0;
andy@13 189 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 190 *value = res;
james@95 191
james@342 192 //KdPrint((__DRIVER_NAME " <-- " __FUNCTION__ "\n"));
james@95 193
andy@13 194 return NULL;
james@0 195 }
james@0 196
james@624 197 /* Called at PASSIVE_LEVEL */
james@0 198 char *
andy@13 199 XenBus_Write(
andy@13 200 PVOID Context,
andy@13 201 xenbus_transaction_t xbt,
james@504 202 char *path,
james@504 203 char *value)
james@0 204 {
james@258 205 PXENPCI_DEVICE_DATA xpdd = Context;
andy@13 206 struct write_req req[] = {
james@145 207 {path, (ULONG)strlen(path) + 1},
andy@264 208 {value, (ULONG)strlen(value)},
andy@13 209 };
andy@13 210 struct xsd_sockmsg *rep;
andy@13 211 char *msg;
james@0 212
james@1022 213 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@272 214
james@504 215 rep = xenbus_format_msg_reply(xpdd, XS_WRITE, xbt, req, ARRAY_SIZE(req));
andy@13 216 msg = errmsg(rep);
andy@13 217 if (msg)
andy@13 218 return msg;
andy@13 219 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 220
andy@13 221 return NULL;
james@0 222 }
james@0 223
james@624 224 /* Called at PASSIVE_LEVEL */
james@624 225 static VOID
james@624 226 XenBus_WatchWorkItemProc(WDFWORKITEM workitem)
james@624 227 {
james@624 228 WDFDEVICE device = WdfWorkItemGetParentObject(workitem);
james@624 229 PXENPCI_DEVICE_DATA xpdd = GetXpdd(device);
james@624 230 xsd_sockmsg_t *msg;
james@624 231 PCHAR path;
james@624 232 int index;
james@624 233 PXENBUS_WATCH_ENTRY entry;
james@1004 234 PXN_WATCH_CALLBACK service_routine;
james@790 235 PVOID service_context;
james@624 236
james@624 237 //FUNCTION_ENTER();
james@624 238 msg = WdfObjectGetTypedContext(workitem, xsd_sockmsg_t);
james@624 239 path = (PCHAR)msg + sizeof(xsd_sockmsg_t);
james@624 240 index = atoi(path + strlen(path) + 1);
james@716 241 if (index < 0 || index >= MAX_WATCH_ENTRIES)
james@716 242 {
james@716 243 KdPrint((__DRIVER_NAME " Watch index %d out of range\n", index));
james@716 244 WdfObjectDelete(workitem);
james@790 245 //FUNCTION_ENTER();
james@716 246 return;
james@716 247 }
james@624 248 ExAcquireFastMutex(&xpdd->xb_watch_mutex);
james@624 249 entry = &xpdd->XenBus_WatchEntries[index];
james@624 250 if (!entry->Active || !entry->ServiceRoutine)
james@624 251 {
james@624 252 KdPrint((__DRIVER_NAME " No watch for index %d\n", index));
james@630 253 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@624 254 WdfObjectDelete(workitem);
james@790 255 //FUNCTION_ENTER();
james@624 256 return;
james@624 257 }
james@624 258 entry->Count++;
james@790 259 service_routine = entry->ServiceRoutine;
james@790 260 service_context = entry->ServiceContext;
james@790 261 service_routine(path, service_context);
james@624 262 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@624 263 WdfObjectDelete(workitem);
james@790 264 //FUNCTION_EXIT();
james@624 265 }
james@624 266
james@624 267 /* Called at DISPATCH_LEVEL */
james@515 268 static VOID
james@515 269 XenBus_Dpc(PVOID ServiceContext)
james@515 270 {
james@624 271 NTSTATUS status;
james@515 272 PXENPCI_DEVICE_DATA xpdd = ServiceContext;
james@624 273 xsd_sockmsg_t msg;
james@683 274 ULONG msg_len;
james@624 275 WDF_WORKITEM_CONFIG workitem_config;
james@624 276 WDF_OBJECT_ATTRIBUTES workitem_attributes;
james@624 277 WDFWORKITEM workitem;
james@853 278 ULONG rsp_prod;
james@515 279
james@624 280 //FUNCTION_ENTER();
james@646 281
james@646 282 KeAcquireSpinLockAtDpcLevel(&xpdd->xb_ring_spinlock);
james@515 283
james@853 284 /* snapshot rsp_prod so it doesn't change while we are looking at it */
james@853 285 while ((rsp_prod = xpdd->xen_store_interface->rsp_prod) != xpdd->xen_store_interface->rsp_cons)
james@624 286 {
james@853 287 KeMemoryBarrier(); /* make sure the data in the ring is valid */
james@683 288 if (!xpdd->xb_msg)
james@624 289 {
james@853 290 if (rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(xsd_sockmsg_t))
james@683 291 {
james@790 292 //KdPrint((__DRIVER_NAME " +++ Message incomplete (not even a full header)\n"));
james@683 293 break;
james@683 294 }
james@683 295 memcpy_from_ring(xpdd->xen_store_interface->rsp, &msg,
james@683 296 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), sizeof(xsd_sockmsg_t));
james@683 297 xpdd->xb_msg = ExAllocatePoolWithTag(NonPagedPool, sizeof(xsd_sockmsg_t) + msg.len, XENPCI_POOL_TAG);
james@683 298 memcpy(xpdd->xb_msg, &msg, sizeof(xsd_sockmsg_t));
james@683 299 xpdd->xb_msg_offset = sizeof(xsd_sockmsg_t);
james@683 300 xpdd->xen_store_interface->rsp_cons += sizeof(xsd_sockmsg_t);
james@624 301 }
james@683 302
james@853 303 msg_len = min(rsp_prod - xpdd->xen_store_interface->rsp_cons, sizeof(xsd_sockmsg_t) + xpdd->xb_msg->len - xpdd->xb_msg_offset);
james@1022 304 XN_ASSERT(xpdd->xb_msg_offset + msg_len <= sizeof(xsd_sockmsg_t) + xpdd->xb_msg->len);
james@683 305 memcpy_from_ring(xpdd->xen_store_interface->rsp,
james@683 306 (PUCHAR)xpdd->xb_msg + xpdd->xb_msg_offset,
james@683 307 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons),
james@683 308 msg_len);
james@683 309 xpdd->xen_store_interface->rsp_cons += msg_len;
james@683 310 xpdd->xb_msg_offset += msg_len;
james@683 311
james@683 312 if (xpdd->xb_msg_offset < sizeof(xsd_sockmsg_t) + xpdd->xb_msg->len)
james@624 313 {
james@790 314 //KdPrint((__DRIVER_NAME " +++ Message incomplete (header but not full body)\n"));
james@1005 315 EvtChn_Notify(xpdd, xpdd->xenbus_event); /* there is room on the ring now */
james@624 316 break;
james@624 317 }
james@515 318
james@683 319 if (xpdd->xb_msg->type != XS_WATCH_EVENT)
james@624 320 {
james@624 321 /* process reply - only ever one outstanding */
james@1022 322 XN_ASSERT(xpdd->xb_reply == NULL);
james@683 323 xpdd->xb_reply = xpdd->xb_msg;
james@683 324 xpdd->xb_msg = NULL;
james@624 325 KeSetEvent(&xpdd->xb_request_complete_event, IO_NO_INCREMENT, FALSE);
james@624 326 }
james@624 327 else
james@624 328 {
james@624 329 /* process watch */
james@624 330 WDF_WORKITEM_CONFIG_INIT(&workitem_config, XenBus_WatchWorkItemProc);
james@624 331 WDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE(&workitem_attributes, xsd_sockmsg_t);
james@624 332 workitem_attributes.ParentObject = xpdd->wdf_device;
james@683 333 workitem_attributes.ContextSizeOverride = xpdd->xb_msg_offset;
james@624 334 status = WdfWorkItemCreate(&workitem_config, &workitem_attributes, &workitem);
james@624 335 if (!NT_SUCCESS(status))
james@624 336 {
james@624 337 KdPrint((__DRIVER_NAME " Failed to create work item for watch\n"));
james@624 338 continue;
james@624 339 }
james@683 340 memcpy(WdfObjectGetTypedContext(workitem, xsd_sockmsg_t), xpdd->xb_msg, xpdd->xb_msg_offset);
james@683 341 xpdd->xb_msg = NULL;
james@624 342 WdfWorkItemEnqueue(workitem);
james@624 343 }
james@1005 344 EvtChn_Notify(xpdd, xpdd->xenbus_event); /* there is room on the ring now */
james@624 345 }
james@646 346 KeReleaseSpinLockFromDpcLevel(&xpdd->xb_ring_spinlock);
james@624 347
james@624 348 //FUNCTION_EXIT();
james@515 349 }
james@515 350
james@624 351 static NTSTATUS
james@342 352 XenBus_Connect(PXENPCI_DEVICE_DATA xpdd)
james@342 353 {
james@342 354 PHYSICAL_ADDRESS pa_xen_store_interface;
james@342 355 xen_ulong_t xen_store_mfn;
james@342 356
james@1005 357 xpdd->xenbus_event = (evtchn_port_t)hvm_get_parameter(xpdd, HVM_PARAM_STORE_EVTCHN);
james@342 358 xen_store_mfn = (xen_ulong_t)hvm_get_parameter(xpdd, HVM_PARAM_STORE_PFN);
james@342 359 pa_xen_store_interface.QuadPart = (ULONGLONG)xen_store_mfn << PAGE_SHIFT;
james@342 360 xpdd->xen_store_interface = MmMapIoSpace(pa_xen_store_interface, PAGE_SIZE, MmNonCached);
james@342 361
james@1005 362 EvtChn_BindDpc(xpdd, xpdd->xenbus_event, XenBus_Dpc, xpdd, EVT_ACTION_FLAGS_NO_SUSPEND);
james@624 363
james@624 364 return STATUS_SUCCESS;
james@624 365 }
james@624 366
james@624 367 static NTSTATUS
james@624 368 XenBus_Disconnect(PXENPCI_DEVICE_DATA xpdd)
james@624 369 {
james@1005 370 EvtChn_Unbind(xpdd, xpdd->xenbus_event);
james@624 371
james@624 372 MmUnmapIoSpace(xpdd->xen_store_interface, PAGE_SIZE);
james@390 373
james@390 374 return STATUS_SUCCESS;
james@342 375 }
james@342 376
james@0 377 NTSTATUS
james@258 378 XenBus_Init(PXENPCI_DEVICE_DATA xpdd)
james@0 379 {
james@390 380 NTSTATUS status;
james@35 381 int i;
andy@37 382
james@624 383 FUNCTION_ENTER();
james@35 384
james@1022 385 XN_ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
james@35 386
james@646 387 KeInitializeSpinLock(&xpdd->xb_ring_spinlock);
james@504 388 ExInitializeFastMutex(&xpdd->xb_request_mutex);
james@504 389 ExInitializeFastMutex(&xpdd->xb_watch_mutex);
james@128 390
james@35 391 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@128 392 {
andy@38 393 xpdd->XenBus_WatchEntries[i].Active = 0;
james@128 394 }
james@0 395
james@504 396 KeInitializeEvent(&xpdd->xb_request_complete_event, SynchronizationEvent, FALSE);
james@504 397
james@390 398 status = XenBus_Connect(xpdd);
james@390 399 if (!NT_SUCCESS(status))
andy@101 400 {
james@673 401 FUNCTION_EXIT();
james@390 402 return status;
andy@101 403 }
james@342 404
james@624 405 FUNCTION_EXIT();
james@0 406
james@0 407 return STATUS_SUCCESS;
james@0 408 }
james@0 409
james@406 410 char *
james@406 411 XenBus_SendRemWatch(
james@406 412 PVOID context,
james@406 413 xenbus_transaction_t xbt,
james@504 414 char *path,
james@504 415 int index)
james@406 416 {
james@406 417 struct xsd_sockmsg *rep;
james@406 418 char *msg;
james@406 419 char Token[20];
james@406 420 struct write_req req[2];
james@406 421
james@406 422 req[0].data = path;
james@406 423 req[0].len = (ULONG)strlen(path) + 1;
james@406 424
james@406 425 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", index);
james@406 426 req[1].data = Token;
james@406 427 req[1].len = (ULONG)strlen(Token) + 1;
james@406 428
james@504 429 rep = xenbus_format_msg_reply(context, XS_UNWATCH, xbt, req, ARRAY_SIZE(req));
james@406 430
james@406 431 msg = errmsg(rep);
james@406 432 if (msg)
james@406 433 return msg;
james@406 434
james@406 435 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@406 436
james@406 437 return NULL;
james@406 438 }
james@406 439
james@35 440 NTSTATUS
james@622 441 XenBus_Halt(PXENPCI_DEVICE_DATA xpdd)
james@35 442 {
james@406 443 int i;
james@35 444
james@406 445 FUNCTION_ENTER();
james@406 446
james@1022 447 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@272 448
james@406 449 /* we need to remove the watches as a watch firing could lead to a XenBus_Read/Write/Printf */
james@624 450 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@624 451 {
james@406 452 if (xpdd->XenBus_WatchEntries[i].Active)
james@624 453 {
james@624 454 xpdd->XenBus_WatchEntries[i].Active = 0;
james@406 455 XenBus_SendRemWatch(xpdd, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path, i);
james@624 456 }
james@406 457 }
james@406 458
james@624 459 XenBus_Disconnect(xpdd);
james@35 460
james@406 461 FUNCTION_EXIT();
james@35 462
james@0 463 return STATUS_SUCCESS;
james@0 464 }
james@0 465
james@0 466 char *
andy@13 467 XenBus_List(
andy@13 468 PVOID Context,
andy@13 469 xenbus_transaction_t xbt,
james@504 470 char *pre,
andy@13 471 char ***contents)
james@0 472 {
james@258 473 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 474 struct xsd_sockmsg *reply, *repmsg;
james@145 475 struct write_req req[] = { { pre, (ULONG)strlen(pre)+1 } };
james@0 476 ULONG nr_elems, x, i;
james@0 477 char **res;
james@0 478 char *msg;
james@0 479
james@1022 480 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@272 481
james@504 482 repmsg = xenbus_format_msg_reply(xpdd, XS_DIRECTORY, xbt, req, ARRAY_SIZE(req));
james@0 483 msg = errmsg(repmsg);
andy@15 484 if (msg)
andy@15 485 {
james@0 486 *contents = NULL;
james@0 487 return msg;
james@0 488 }
james@0 489 reply = repmsg + 1;
james@0 490 for (x = nr_elems = 0; x < repmsg->len; x++)
andy@15 491 {
james@0 492 nr_elems += (((char *)reply)[x] == 0);
andy@15 493 }
andy@15 494 res = ExAllocatePoolWithTag(NonPagedPool, sizeof(res[0]) * (nr_elems + 1),
andy@15 495 XENPCI_POOL_TAG);
andy@15 496 for (x = i = 0; i < nr_elems; i++)
andy@15 497 {
james@145 498 int l = (int)strlen((char *)reply + x);
james@0 499 res[i] = ExAllocatePoolWithTag(NonPagedPool, l + 1, XENPCI_POOL_TAG);
james@0 500 memcpy(res[i], (char *)reply + x, l + 1);
james@0 501 x += l + 1;
james@0 502 }
james@0 503 res[i] = NULL;
james@0 504 ExFreePoolWithTag(repmsg, XENPCI_POOL_TAG);
james@0 505 *contents = res;
james@624 506
james@0 507 return NULL;
james@0 508 }
james@0 509
james@624 510 /* Called at PASSIVE_LEVEL */
james@279 511 static char *
james@279 512 XenBus_SendAddWatch(
james@279 513 PVOID Context,
james@279 514 xenbus_transaction_t xbt,
james@504 515 char *Path,
james@279 516 int slot)
james@279 517 {
james@279 518 PXENPCI_DEVICE_DATA xpdd = Context;
james@279 519 struct xsd_sockmsg *rep;
james@279 520 char *msg;
james@279 521 char Token[20];
james@279 522 struct write_req req[2];
james@279 523
james@279 524 req[0].data = Path;
james@279 525 req[0].len = (ULONG)strlen(Path) + 1;
james@279 526
james@279 527 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", slot);
james@279 528 req[1].data = Token;
james@279 529 req[1].len = (ULONG)strlen(Token) + 1;
james@279 530
james@504 531 rep = xenbus_format_msg_reply(xpdd, XS_WATCH, xbt, req, ARRAY_SIZE(req));
james@404 532
james@279 533 msg = errmsg(rep);
james@283 534 if (!msg)
james@283 535 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@279 536
james@279 537 return msg;
james@279 538 }
james@279 539
james@342 540 /* called at PASSIVE_LEVEL */
james@390 541 NTSTATUS
james@409 542 XenBus_Suspend(PXENPCI_DEVICE_DATA xpdd)
james@409 543 {
james@409 544 int i;
james@409 545
james@409 546 /* we need to remove the watches as a watch firing could lead to a XenBus_Read/Write/Printf */
james@409 547 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
james@409 548 if (xpdd->XenBus_WatchEntries[i].Active)
james@409 549 XenBus_SendRemWatch(xpdd, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path, i);
james@409 550 }
james@624 551 XenBus_Disconnect(xpdd);
james@624 552
james@409 553 return STATUS_SUCCESS;
james@409 554 }
james@409 555
james@409 556 /* called at PASSIVE_LEVEL */
james@409 557 NTSTATUS
james@279 558 XenBus_Resume(PXENPCI_DEVICE_DATA xpdd)
james@279 559 {
james@390 560 NTSTATUS status;
james@279 561 int i;
james@341 562
andy@398 563 FUNCTION_ENTER();
james@342 564
james@390 565 status = XenBus_Connect(xpdd);
james@390 566 if (!NT_SUCCESS(status))
james@390 567 {
james@390 568 return status;
james@390 569 }
james@279 570
james@279 571 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@341 572 {
james@279 573 if (xpdd->XenBus_WatchEntries[i].Active)
james@341 574 {
james@835 575 KdPrint((__DRIVER_NAME " Adding watch for path = %s\n", xpdd->XenBus_WatchEntries[i].Path));
james@279 576 XenBus_SendAddWatch(xpdd, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path, i);
james@341 577 }
james@341 578 }
james@835 579
andy@398 580 FUNCTION_EXIT();
james@390 581
james@390 582 return STATUS_SUCCESS;
james@279 583 }
james@279 584
james@0 585 char *
andy@15 586 XenBus_AddWatch(
andy@13 587 PVOID Context,
andy@13 588 xenbus_transaction_t xbt,
james@504 589 char *Path,
james@1004 590 PXN_WATCH_CALLBACK ServiceRoutine,
andy@13 591 PVOID ServiceContext)
james@0 592 {
james@258 593 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 594 char *msg;
james@0 595 int i;
andy@94 596 PXENBUS_WATCH_ENTRY w_entry;
james@0 597
james@1022 598 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@0 599
james@1022 600 XN_ASSERT(strlen(Path) < ARRAY_SIZE(w_entry->Path));
james@0 601
james@504 602 ExAcquireFastMutex(&xpdd->xb_watch_mutex);
james@128 603
james@0 604 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@15 605 if (xpdd->XenBus_WatchEntries[i].Active == 0)
james@0 606 break;
james@0 607
james@0 608 if (i == MAX_WATCH_ENTRIES)
james@0 609 {
james@0 610 KdPrint((__DRIVER_NAME " +++ No more watch slots left\n"));
james@504 611 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@0 612 return NULL;
james@0 613 }
james@0 614
andy@94 615 /* must init watchentry before starting watch */
james@128 616
andy@94 617 w_entry = &xpdd->XenBus_WatchEntries[i];
james@716 618 RtlStringCbCopyA(w_entry->Path, ARRAY_SIZE(w_entry->Path), Path);
andy@94 619 w_entry->ServiceRoutine = ServiceRoutine;
andy@94 620 w_entry->ServiceContext = ServiceContext;
andy@94 621 w_entry->Count = 0;
andy@94 622 w_entry->Active = 1;
andy@94 623
james@504 624 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@128 625
james@279 626 msg = XenBus_SendAddWatch(xpdd, xbt, Path, i);
james@0 627
andy@93 628 if (msg)
andy@93 629 {
andy@93 630 xpdd->XenBus_WatchEntries[i].Active = 0;
andy@93 631 return msg;
andy@93 632 }
andy@93 633
james@0 634 return NULL;
james@0 635 }
james@0 636
james@0 637 char *
andy@13 638 XenBus_RemWatch(
james@1019 639 PVOID Context,
james@1019 640 xenbus_transaction_t xbt,
james@1019 641 char *Path,
james@1019 642 PXN_WATCH_CALLBACK ServiceRoutine,
james@1019 643 PVOID ServiceContext) {
james@258 644 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 645 char *msg;
james@0 646 int i;
james@0 647
james@1022 648 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@0 649
james@504 650 ExAcquireFastMutex(&xpdd->xb_watch_mutex);
james@128 651
james@0 652 // check that Path < 128 chars
james@0 653
james@1019 654 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
james@538 655 if (xpdd->XenBus_WatchEntries[i].Active
james@1019 656 && !strcmp(xpdd->XenBus_WatchEntries[i].Path, Path)
james@1019 657 && xpdd->XenBus_WatchEntries[i].ServiceRoutine == ServiceRoutine
james@1019 658 && xpdd->XenBus_WatchEntries[i].ServiceContext == ServiceContext) {
james@409 659 KdPrint((__DRIVER_NAME " Match\n"));
james@0 660 break;
james@409 661 }
james@0 662 }
james@0 663
james@1019 664 if (i == MAX_WATCH_ENTRIES) {
james@504 665 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@835 666 KdPrint((__DRIVER_NAME " Watch not set for %s - can't remove\n", Path));
james@0 667 return NULL;
james@0 668 }
james@0 669
james@128 670 xpdd->XenBus_WatchEntries[i].Active = 0;
james@128 671 xpdd->XenBus_WatchEntries[i].Path[0] = 0;
james@128 672
james@504 673 ExReleaseFastMutex(&xpdd->xb_watch_mutex);
james@0 674
james@406 675 msg = XenBus_SendRemWatch(Context, xbt, Path, i);
james@406 676
james@406 677 return msg;
james@0 678 }
james@0 679
james@0 680 char *
andy@13 681 XenBus_StartTransaction(PVOID Context, xenbus_transaction_t *xbt)
james@0 682 {
james@258 683 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 684 /* xenstored becomes angry if you send a length 0 message, so just
james@0 685 shove a nul terminator on the end */
james@0 686 struct write_req req = { "", 1};
james@0 687 struct xsd_sockmsg *rep;
james@0 688 char *err;
james@0 689
james@1022 690 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@95 691
james@504 692 rep = xenbus_format_msg_reply(xpdd, XS_TRANSACTION_START, 0, &req, 1);
james@0 693 err = errmsg(rep);
james@0 694 if (err)
james@0 695 return err;
james@0 696 *xbt = atoi((char *)(rep + 1));
james@0 697 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 698
james@0 699 return NULL;
james@0 700 }
james@0 701
james@0 702 char *
andy@15 703 XenBus_EndTransaction(
andy@15 704 PVOID Context,
andy@15 705 xenbus_transaction_t t,
andy@15 706 int abort,
andy@15 707 int *retry)
james@0 708 {
james@258 709 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 710 struct xsd_sockmsg *rep;
james@0 711 struct write_req req;
james@0 712 char *err;
james@0 713
james@0 714 *retry = 0;
james@0 715
james@0 716 req.data = abort ? "F" : "T";
james@0 717 req.len = 2;
james@504 718 rep = xenbus_format_msg_reply(xpdd, XS_TRANSACTION_END, t, &req, 1);
james@0 719 err = errmsg(rep);
james@0 720 if (err) {
james@0 721 if (!strcmp(err, "EAGAIN")) {
james@0 722 *retry = 1;
james@0 723 ExFreePoolWithTag(err, XENPCI_POOL_TAG);
james@0 724 return NULL;
james@0 725 } else {
james@0 726 return err;
james@0 727 }
james@0 728 }
james@0 729 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@95 730
james@0 731 return NULL;
james@0 732 }
james@0 733
james@0 734 char *
andy@15 735 XenBus_Printf(
andy@15 736 PVOID Context,
andy@15 737 xenbus_transaction_t xbt,
james@504 738 char *path,
james@504 739 char *fmt,
andy@15 740 ...)
james@0 741 {
james@258 742 PXENPCI_DEVICE_DATA xpdd = Context;
james@0 743 va_list ap;
andy@101 744 char buf[512];
james@95 745 char *retval;
james@95 746
james@1022 747 XN_ASSERT(KeGetCurrentIrql() < DISPATCH_LEVEL);
james@0 748
james@0 749 va_start(ap, fmt);
james@0 750 RtlStringCbVPrintfA(buf, ARRAY_SIZE(buf), fmt, ap);
james@0 751 va_end(ap);
james@258 752 retval = XenBus_Write(xpdd, xbt, path, buf);
james@95 753
james@95 754 return retval;
andy@37 755 }