win-pvdrivers

annotate xenpci/xenbus.c @ 94:ee715addb716

xenbus: tidy up msg_reply and AddWatch
author Andy Grover <andy.grover@oracle.com>
date Thu Jan 03 16:34:04 2008 -0800 (2008-01-03)
parents 2a2f98373c9a
children b55f4ed508b0
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
james@35 222 // KdPrint((__DRIVER_NAME " --> xenbus_msg_reply\n"));
james@0 223
andy@15 224 id = allocate_xenbus_id(Device);
andy@13 225 xb_write(Device, type, id, trans, io, nr_reqs);
andy@94 226
james@35 227 // KdPrint((__DRIVER_NAME " starting wait\n"));
andy@15 228 KeWaitForSingleObject(&xpdd->req_info[id].WaitEvent, Executive, KernelMode, FALSE, NULL);
james@9 229 //KdPrint((__DRIVER_NAME " wait complete\n"));
james@0 230
andy@15 231 release_xenbus_id(Device, id);
james@35 232 // KdPrint((__DRIVER_NAME " <-- xenbus_msg_reply\n"));
andy@94 233 return xpdd->req_info[id].Reply;
james@0 234 }
james@0 235
james@0 236 char *
andy@15 237 XenBus_Read(
andy@13 238 PVOID Context,
andy@13 239 xenbus_transaction_t xbt,
andy@13 240 const char *path,
andy@13 241 char **value)
james@0 242 {
andy@13 243 WDFDEVICE Device = Context;
andy@13 244 struct write_req req[] = { {path, strlen(path) + 1} };
andy@13 245 struct xsd_sockmsg *rep;
andy@13 246 char *res;
andy@13 247 char *msg;
james@0 248
andy@13 249 rep = xenbus_msg_reply(Device, XS_READ, xbt, req, ARRAY_SIZE(req));
andy@13 250 msg = errmsg(rep);
andy@13 251 if (msg) {
andy@13 252 *value = NULL;
andy@13 253 return msg;
andy@13 254 }
andy@13 255 res = ExAllocatePoolWithTag(NonPagedPool, rep->len + 1, XENPCI_POOL_TAG);
andy@13 256 memcpy(res, rep + 1, rep->len);
andy@13 257 res[rep->len] = 0;
andy@13 258 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 259 *value = res;
andy@13 260 return NULL;
james@0 261 }
james@0 262
james@0 263 char *
andy@13 264 XenBus_Write(
andy@13 265 PVOID Context,
andy@13 266 xenbus_transaction_t xbt,
andy@13 267 const char *path,
andy@13 268 const char *value)
james@0 269 {
andy@13 270 WDFDEVICE Device = Context;
andy@13 271 struct write_req req[] = {
andy@13 272 {path, strlen(path) + 1},
andy@13 273 {value, strlen(value) + 1},
andy@13 274 };
andy@13 275 struct xsd_sockmsg *rep;
andy@13 276 char *msg;
james@0 277
andy@13 278 rep = xenbus_msg_reply(Device, XS_WRITE, xbt, req, ARRAY_SIZE(req));
andy@13 279 msg = errmsg(rep);
andy@13 280 if (msg)
andy@13 281 return msg;
andy@13 282 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@13 283 return NULL;
james@0 284 }
james@0 285
james@0 286 NTSTATUS
andy@13 287 XenBus_Init(WDFDEVICE Device)
james@0 288 {
andy@37 289 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@35 290 NTSTATUS Status;
james@35 291 int i;
andy@37 292
james@0 293 //KdPrint((__DRIVER_NAME " --> XenBus_Init\n"));
james@35 294
andy@15 295 xpdd->xen_store_evtchn = EvtChn_GetXenStorePort(Device);
andy@15 296 xpdd->xen_store_interface = EvtChn_GetXenStoreRingAddr(Device);
james@0 297
james@35 298 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@38 299 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 300
andy@15 301 KeInitializeEvent(&xpdd->XenBus_ReadThreadEvent, SynchronizationEvent, FALSE);
andy@15 302 KeInitializeEvent(&xpdd->XenBus_WatchThreadEvent, SynchronizationEvent, FALSE);
andy@38 303 xpdd->XenBus_ShuttingDown = FALSE;
james@0 304
james@35 305 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 306 //Status = PsCreateSystemThread(&XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_ReadThreadProc, NULL);
andy@41 307 Status = PsCreateSystemThread(&xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_ReadThreadProc, Device);
james@35 308
james@35 309 //InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
james@35 310 //Status = PsCreateSystemThread(&XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, &oa, NULL, NULL, XenBus_WatchThreadProc, NULL);
andy@41 311 Status = PsCreateSystemThread(&xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, NULL, NULL, XenBus_WatchThreadProc, Device);
james@35 312
james@35 313 KdPrint((__DRIVER_NAME " <-- XenBus_Init\n"));
james@0 314
james@0 315 return STATUS_SUCCESS;
james@0 316 }
james@0 317
james@0 318 NTSTATUS
andy@13 319 XenBus_Start(WDFDEVICE Device)
james@0 320 {
andy@38 321 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@38 322
james@6 323 KdPrint((__DRIVER_NAME " --> XenBus_Start\n"));
james@0 324
andy@89 325 EvtChn_BindDpc(Device, xpdd->xen_store_evtchn, XenBus_Interrupt, Device);
james@0 326
james@6 327 KdPrint((__DRIVER_NAME " <-- XenBus_Start\n"));
james@0 328
james@0 329 return STATUS_SUCCESS;
james@0 330 }
james@0 331
james@0 332 NTSTATUS
andy@13 333 XenBus_Stop(WDFDEVICE Device)
james@0 334 {
andy@15 335 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 336 int i;
james@0 337
james@35 338 KdPrint((__DRIVER_NAME " --> XenBus_Stop\n"));
james@35 339
james@0 340 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
james@0 341 {
andy@38 342 if (xpdd->XenBus_WatchEntries[i].Active)
andy@38 343 XenBus_RemWatch(Device, XBT_NIL, xpdd->XenBus_WatchEntries[i].Path,
andy@38 344 xpdd->XenBus_WatchEntries[i].ServiceRoutine,
andy@38 345 xpdd->XenBus_WatchEntries[i].ServiceContext);
james@0 346 }
james@0 347
andy@15 348 EvtChn_Unbind(Device, xpdd->xen_store_evtchn);
james@0 349
james@35 350 KdPrint((__DRIVER_NAME " <-- XenBus_Stop\n"));
james@35 351
james@35 352 return STATUS_SUCCESS;
james@35 353 }
james@35 354
james@35 355 NTSTATUS
andy@37 356 XenBus_Close(WDFDEVICE Device)
james@35 357 {
andy@38 358 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@56 359 //KWAIT_BLOCK WaitBlockArray[2];
james@35 360 PVOID WaitArray[2];
james@35 361
andy@38 362 xpdd->XenBus_ShuttingDown = TRUE;
james@35 363
james@35 364 KdPrint((__DRIVER_NAME " Signalling Threads\n"));
andy@38 365 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
andy@38 366 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@35 367 KdPrint((__DRIVER_NAME " Waiting for threads to die\n"));
andy@38 368 ObReferenceObjectByHandle(xpdd->XenBus_ReadThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[0], NULL);
andy@38 369 ObReferenceObjectByHandle(xpdd->XenBus_WatchThreadHandle, THREAD_ALL_ACCESS, NULL, KernelMode, &WaitArray[1], NULL);
james@48 370 //KeWaitForMultipleObjects(1, &WaitArray[0], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 371 KdPrint((__DRIVER_NAME " Waiting for ReadThread\n"));
james@48 372 KeWaitForSingleObject(WaitArray[0], Executive, KernelMode, FALSE, NULL);
james@48 373 KdPrint((__DRIVER_NAME " Waiting for WatchThread\n"));
james@48 374 //KeWaitForMultipleObjects(1, &WaitArray[1], WaitAny, Executive, KernelMode, FALSE, NULL, WaitBlockArray);
james@48 375 KeWaitForSingleObject(WaitArray[1], Executive, KernelMode, FALSE, NULL);
james@35 376 KdPrint((__DRIVER_NAME " Threads are dead\n"));
james@35 377
andy@38 378 xpdd->XenBus_ShuttingDown = FALSE;
james@35 379
james@48 380 // ObDereferenceObject(WaitArray[0]);
james@48 381 // ObDereferenceObject(WaitArray[1]);
james@48 382
james@48 383 KdPrint((__DRIVER_NAME " A\n"));
james@35 384
andy@15 385 ZwClose(xpdd->XenBus_WatchThreadHandle);
james@48 386
james@48 387 KdPrint((__DRIVER_NAME " B\n"));
james@48 388
andy@15 389 ZwClose(xpdd->XenBus_ReadThreadHandle);
james@0 390
james@35 391 KdPrint((__DRIVER_NAME " <-- XenBus_Close\n"));
james@35 392
james@0 393 return STATUS_SUCCESS;
james@0 394 }
james@0 395
james@0 396 char *
andy@13 397 XenBus_List(
andy@13 398 PVOID Context,
andy@13 399 xenbus_transaction_t xbt,
andy@13 400 const char *pre,
andy@13 401 char ***contents)
james@0 402 {
andy@13 403 WDFDEVICE Device = Context;
james@0 404 struct xsd_sockmsg *reply, *repmsg;
james@0 405 struct write_req req[] = { { pre, strlen(pre)+1 } };
james@0 406 ULONG nr_elems, x, i;
james@0 407 char **res;
james@0 408 char *msg;
james@0 409
james@0 410 //KdPrint((__DRIVER_NAME " --> xenbus_ls\n"));
james@0 411
andy@13 412 repmsg = xenbus_msg_reply(Device, XS_DIRECTORY, xbt, req, ARRAY_SIZE(req));
james@0 413 msg = errmsg(repmsg);
andy@15 414 if (msg)
andy@15 415 {
james@0 416 *contents = NULL;
james@0 417 //KdPrint((__DRIVER_NAME " <-- xenbus_ls (error)\n"));
james@0 418 return msg;
james@0 419 }
james@0 420 reply = repmsg + 1;
james@0 421 for (x = nr_elems = 0; x < repmsg->len; x++)
andy@15 422 {
james@0 423 nr_elems += (((char *)reply)[x] == 0);
andy@15 424 }
andy@15 425 res = ExAllocatePoolWithTag(NonPagedPool, sizeof(res[0]) * (nr_elems + 1),
andy@15 426 XENPCI_POOL_TAG);
andy@15 427 for (x = i = 0; i < nr_elems; i++)
andy@15 428 {
james@0 429 int l = strlen((char *)reply + x);
james@0 430 res[i] = ExAllocatePoolWithTag(NonPagedPool, l + 1, XENPCI_POOL_TAG);
james@0 431 memcpy(res[i], (char *)reply + x, l + 1);
james@0 432 x += l + 1;
james@0 433 }
james@0 434 res[i] = NULL;
james@0 435 ExFreePoolWithTag(repmsg, XENPCI_POOL_TAG);
james@0 436 *contents = res;
james@0 437 //KdPrint((__DRIVER_NAME " <-- xenbus_ls\n"));
james@0 438 return NULL;
james@0 439 }
james@0 440
andy@15 441 static void
andy@15 442 XenBus_ReadThreadProc(PVOID StartContext)
james@0 443 {
james@0 444 int NewWriteIndex;
james@0 445 struct xsd_sockmsg msg;
james@0 446 char *payload;
james@0 447 char *path, *token;
andy@15 448 WDFDEVICE Device = StartContext;
andy@15 449 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 450
james@0 451 for(;;)
james@0 452 {
andy@15 453 KeWaitForSingleObject(&xpdd->XenBus_ReadThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 454 if (xpdd->XenBus_ShuttingDown)
james@35 455 {
james@35 456 KdPrint((__DRIVER_NAME " Shutdown detected in ReadThreadProc\n"));
james@35 457 PsTerminateSystemThread(0);
james@35 458 }
james@0 459 //KdPrint((__DRIVER_NAME " ReadThread Woken (Count = %d)\n", ReadThreadWaitCount++));
andy@15 460 while (xpdd->xen_store_interface->rsp_prod != xpdd->xen_store_interface->rsp_cons)
james@0 461 {
james@0 462 //KdPrint((__DRIVER_NAME " a - Rsp_cons %d, rsp_prod %d.\n", xen_store_interface->rsp_cons, xen_store_interface->rsp_prod));
andy@15 463 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg))
james@0 464 {
james@0 465 //KdPrint((__DRIVER_NAME " +++ Message incomplete (not even a full header)\n"));
james@0 466 break;
james@0 467 }
james@0 468 //_ReadBarrier();
james@0 469 KeMemoryBarrier();
andy@15 470 memcpy_from_ring(xpdd->xen_store_interface->rsp, &msg,
andy@15 471 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), sizeof(msg));
andy@15 472 if (xpdd->xen_store_interface->rsp_prod - xpdd->xen_store_interface->rsp_cons < sizeof(msg) + msg.len)
james@0 473 {
james@0 474 //KdPrint((__DRIVER_NAME " +++ Message incomplete (header but not full body)\n"));
james@0 475 break;
james@0 476 }
james@0 477
andy@20 478 if (msg.type != XS_WATCH_EVENT)
andy@20 479 {
andy@20 480 xpdd->req_info[msg.req_id].Reply = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@20 481 memcpy_from_ring(xpdd->xen_store_interface->rsp,
andy@20 482 xpdd->req_info[msg.req_id].Reply,
andy@20 483 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons),
andy@20 484 msg.len + sizeof(msg));
andy@20 485 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
andy@20 486 KeSetEvent(&xpdd->req_info[msg.req_id].WaitEvent, 1, FALSE);
andy@20 487 }
andy@20 488 else // a watch: add to watch ring and signal watch thread
james@0 489 {
james@0 490 payload = ExAllocatePoolWithTag(NonPagedPool, sizeof(msg) + msg.len, XENPCI_POOL_TAG);
andy@15 491 memcpy_from_ring(xpdd->xen_store_interface->rsp, payload,
andy@15 492 MASK_XENSTORE_IDX(xpdd->xen_store_interface->rsp_cons), msg.len + sizeof(msg));
andy@15 493 xpdd->xen_store_interface->rsp_cons += msg.len + sizeof(msg);
james@0 494 path = payload + sizeof(msg);
james@0 495 token = path + strlen(path) + 1;
james@0 496
andy@15 497 NewWriteIndex = (xpdd->XenBus_WatchRingWriteIndex + 1) & 127;
andy@15 498 if (NewWriteIndex != xpdd->XenBus_WatchRingReadIndex)
james@0 499 {
andy@15 500 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Path, path, 128);
andy@15 501 strncpy(xpdd->XenBus_WatchRing[NewWriteIndex].Token, token, 10);
andy@15 502 xpdd->XenBus_WatchRingWriteIndex = NewWriteIndex;
james@0 503 }
james@0 504 else
james@0 505 {
james@0 506 KdPrint((__DRIVER_NAME " +++ Queue full Path = %s Token = %s\n", path, token));
james@0 507 // drop the message on the floor
james@0 508 continue;
james@0 509 }
james@0 510
james@0 511 ExFreePoolWithTag(payload, XENPCI_POOL_TAG);
james@0 512 //KdPrint((__DRIVER_NAME " +++ Watch Path = %s Token = %s\n", path, token));
andy@15 513 KeSetEvent(&xpdd->XenBus_WatchThreadEvent, 1, FALSE);
james@0 514 }
james@0 515 }
james@0 516 }
james@0 517 }
james@0 518
james@0 519 static void
james@0 520 XenBus_WatchThreadProc(PVOID StartContext)
james@0 521 {
james@0 522 int index;
james@0 523 PXENBUS_WATCH_ENTRY entry;
andy@15 524 WDFDEVICE Device = StartContext;
andy@15 525 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 526
james@0 527 for(;;)
james@0 528 {
andy@37 529 KeWaitForSingleObject(&xpdd->XenBus_WatchThreadEvent, Executive, KernelMode, FALSE, NULL);
andy@38 530 if (xpdd->XenBus_ShuttingDown)
james@35 531 {
james@35 532 KdPrint((__DRIVER_NAME " Shutdown detected in WatchThreadProc\n"));
james@35 533 PsTerminateSystemThread(0);
james@35 534 }
andy@38 535 while (xpdd->XenBus_WatchRingReadIndex != xpdd->XenBus_WatchRingWriteIndex)
james@0 536 {
andy@15 537 xpdd->XenBus_WatchRingReadIndex =
andy@15 538 (xpdd->XenBus_WatchRingReadIndex + 1) % WATCH_RING_SIZE;
andy@15 539 index = atoi(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token);
james@0 540 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Path
james@0 541 //XenBus_WatchRing[XenBus_WatchRingReadIndex].Token
james@0 542
andy@15 543 entry = &xpdd->XenBus_WatchEntries[index];
james@0 544 if (!entry->Active)
james@0 545 {
andy@15 546 KdPrint((__DRIVER_NAME " +++ Watch not active! = %s Token = %s\n",
andy@15 547 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 548 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 549 continue;
james@0 550 }
james@0 551 entry->Count++;
james@0 552 if (!entry->ServiceRoutine)
james@0 553 {
andy@15 554 KdPrint((__DRIVER_NAME " +++ no handler for watch! = %s Token = %s\n",
andy@15 555 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path,
andy@15 556 xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Token));
james@0 557 continue;
james@0 558 }
james@0 559 //KdPrint((__DRIVER_NAME " +++ Watch Triggered Path = %s Token = %d (%s)\n", XenBus_WatchRing[XenBus_WatchRingReadIndex].Path, index, XenBus_WatchRing[XenBus_WatchRingReadIndex].Token));
andy@15 560 entry->ServiceRoutine(xpdd->XenBus_WatchRing[xpdd->XenBus_WatchRingReadIndex].Path, entry->ServiceContext);
james@0 561 }
james@0 562 }
james@0 563 }
james@0 564
james@0 565 char *
andy@15 566 XenBus_AddWatch(
andy@13 567 PVOID Context,
andy@13 568 xenbus_transaction_t xbt,
andy@13 569 const char *Path,
andy@13 570 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 571 PVOID ServiceContext)
james@0 572 {
andy@13 573 WDFDEVICE Device = Context;
andy@15 574 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 575 struct xsd_sockmsg *rep;
james@0 576 char *msg;
james@0 577 int i;
james@0 578 char Token[20];
james@0 579 struct write_req req[2];
andy@94 580 PXENBUS_WATCH_ENTRY w_entry;
james@0 581
james@35 582 // KdPrint((__DRIVER_NAME " --> XenBus_AddWatch\n"));
james@0 583
andy@94 584 ASSERT(strlen(Path) < ARRAY_SIZE(w_entry->Path));
james@0 585
james@0 586 for (i = 0; i < MAX_WATCH_ENTRIES; i++)
andy@15 587 if (xpdd->XenBus_WatchEntries[i].Active == 0)
james@0 588 break;
james@0 589
james@0 590 if (i == MAX_WATCH_ENTRIES)
james@0 591 {
james@0 592 KdPrint((__DRIVER_NAME " +++ No more watch slots left\n"));
james@0 593 return NULL;
james@0 594 }
james@0 595
andy@94 596 /* must init watchentry before starting watch */
andy@94 597 w_entry = &xpdd->XenBus_WatchEntries[i];
andy@94 598 strncpy(w_entry->Path, Path, ARRAY_SIZE(w_entry->Path));
andy@94 599 w_entry->ServiceRoutine = ServiceRoutine;
andy@94 600 w_entry->ServiceContext = ServiceContext;
andy@94 601 w_entry->Count = 0;
andy@94 602 w_entry->Active = 1;
andy@94 603
james@0 604 req[0].data = Path;
james@0 605 req[0].len = strlen(Path) + 1;
james@0 606
james@0 607 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 608 req[1].data = Token;
james@0 609 req[1].len = strlen(Token) + 1;
james@0 610
andy@93 611 rep = xenbus_msg_reply(Device, XS_WATCH, xbt, req, ARRAY_SIZE(req));
andy@93 612
andy@93 613 msg = errmsg(rep);
andy@93 614 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
andy@93 615 if (msg)
andy@93 616 {
andy@93 617 xpdd->XenBus_WatchEntries[i].Active = 0;
andy@93 618 return msg;
andy@93 619 }
andy@93 620
james@35 621 // KdPrint((__DRIVER_NAME " <-- XenBus_AddWatch\n"));
james@0 622
james@0 623 return NULL;
james@0 624 }
james@0 625
james@0 626 char *
andy@13 627 XenBus_RemWatch(
andy@13 628 PVOID Context,
andy@13 629 xenbus_transaction_t xbt,
andy@13 630 const char *Path,
andy@13 631 PXENBUS_WATCH_CALLBACK ServiceRoutine,
andy@13 632 PVOID ServiceContext)
james@0 633 {
andy@13 634 WDFDEVICE Device = Context;
andy@15 635 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
james@0 636 struct xsd_sockmsg *rep;
james@0 637 char *msg;
james@0 638 int i;
james@0 639 char Token[20];
james@0 640 struct write_req req[2];
james@0 641
james@0 642 //KdPrint((__DRIVER_NAME " --> XenBus_RemWatch\n"));
james@0 643
james@0 644 // check that Path < 128 chars
james@0 645
james@0 646 for (i = 0; i < MAX_WATCH_ENTRIES; i++) {
andy@15 647 if (xpdd->XenBus_WatchEntries[i].Active == 1
andy@15 648 && strcmp(xpdd->XenBus_WatchEntries[i].Path, Path) == 0
andy@15 649 && xpdd->XenBus_WatchEntries[i].ServiceRoutine == ServiceRoutine
andy@15 650 && xpdd->XenBus_WatchEntries[i].ServiceContext == ServiceContext)
james@0 651 break;
james@0 652 }
james@0 653
james@0 654 if (i == MAX_WATCH_ENTRIES)
james@0 655 {
james@0 656 KdPrint((__DRIVER_NAME " Watch not set - can't remove\n"));
james@0 657 return NULL;
james@0 658 }
james@0 659
james@0 660 req[0].data = Path;
james@0 661 req[0].len = strlen(Path) + 1;
james@0 662
james@0 663 RtlStringCbPrintfA(Token, ARRAY_SIZE(Token), "%d", i);
james@0 664 req[1].data = Token;
james@0 665 req[1].len = strlen(Token) + 1;
james@0 666
andy@13 667 rep = xenbus_msg_reply(Device, XS_UNWATCH, xbt, req, ARRAY_SIZE(req));
james@0 668
james@0 669 msg = errmsg(rep);
james@0 670 if (msg)
james@0 671 return msg;
james@0 672
james@0 673 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 674
andy@15 675 xpdd->XenBus_WatchEntries[i].Active = 0;
james@0 676
james@0 677 //KdPrint((__DRIVER_NAME " <-- XenBus_RemWatch\n"));
james@0 678
james@0 679 return NULL;
james@0 680 }
james@0 681
james@0 682
james@0 683 char *
andy@13 684 XenBus_StartTransaction(PVOID Context, xenbus_transaction_t *xbt)
james@0 685 {
andy@13 686 WDFDEVICE Device = Context;
james@0 687 /* xenstored becomes angry if you send a length 0 message, so just
james@0 688 shove a nul terminator on the end */
james@0 689 struct write_req req = { "", 1};
james@0 690 struct xsd_sockmsg *rep;
james@0 691 char *err;
james@0 692
andy@13 693 rep = xenbus_msg_reply(Device, XS_TRANSACTION_START, 0, &req, 1);
james@0 694 err = errmsg(rep);
james@0 695 if (err)
james@0 696 return err;
james@0 697 *xbt = atoi((char *)(rep + 1));
james@0 698 //sscanf((char *)(rep + 1), "%u", xbt);
james@0 699 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 700 return NULL;
james@0 701 }
james@0 702
james@0 703 char *
andy@15 704 XenBus_EndTransaction(
andy@15 705 PVOID Context,
andy@15 706 xenbus_transaction_t t,
andy@15 707 int abort,
andy@15 708 int *retry)
james@0 709 {
andy@13 710 WDFDEVICE Device = Context;
james@0 711 struct xsd_sockmsg *rep;
james@0 712 struct write_req req;
james@0 713 char *err;
james@0 714
james@0 715 *retry = 0;
james@0 716
james@0 717 req.data = abort ? "F" : "T";
james@0 718 req.len = 2;
andy@13 719 rep = xenbus_msg_reply(Device, XS_TRANSACTION_END, t, &req, 1);
james@0 720 err = errmsg(rep);
james@0 721 if (err) {
james@0 722 if (!strcmp(err, "EAGAIN")) {
james@0 723 *retry = 1;
james@0 724 ExFreePoolWithTag(err, XENPCI_POOL_TAG);
james@0 725 return NULL;
james@0 726 } else {
james@0 727 return err;
james@0 728 }
james@0 729 }
james@0 730 ExFreePoolWithTag(rep, XENPCI_POOL_TAG);
james@0 731 return NULL;
james@0 732 }
james@0 733
james@0 734 static BOOLEAN
james@0 735 XenBus_Interrupt(PKINTERRUPT Interrupt, PVOID ServiceContext)
james@0 736 {
andy@15 737 WDFDEVICE Device = ServiceContext;
andy@15 738 PXENPCI_DEVICE_DATA xpdd = GetDeviceData(Device);
andy@15 739
james@0 740 UNREFERENCED_PARAMETER(Interrupt);
james@0 741
james@0 742 //KdPrint((__DRIVER_NAME " --> XenBus_Interrupt (Count = %d)\n", ReadThreadSetCount++));
james@0 743
andy@15 744 KeSetEvent(&xpdd->XenBus_ReadThreadEvent, 1, FALSE);
james@0 745
james@0 746 //KdPrint((__DRIVER_NAME " <-- XenBus_Interrupt\n"));
james@0 747
james@0 748 return TRUE;
james@0 749 }
james@0 750
james@0 751 char *
andy@15 752 XenBus_Printf(
andy@15 753 PVOID Context,
andy@15 754 xenbus_transaction_t xbt,
andy@15 755 const char *path,
andy@15 756 const char *fmt,
andy@15 757 ...)
james@0 758 {
andy@13 759 WDFDEVICE Device = Context;
james@0 760 va_list ap;
james@0 761 char buf[1024];
james@0 762
james@0 763 va_start(ap, fmt);
james@0 764 RtlStringCbVPrintfA(buf, ARRAY_SIZE(buf), fmt, ap);
james@0 765 va_end(ap);
andy@13 766 return XenBus_Write(Device, xbt, path, buf);
andy@37 767 }