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Reenabled linux-xen, added patches for Xen Kernel Version 2.6.27.31,
[people/teissler/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.drivers / staging-hv-add-the-hyper-v-virtual-storage-driver.patch
1 From foo@baz Mon Jul 13 16:01:31 PDT 2009
2 Date: Mon, 13 Jul 2009 16:01:31 -0700
3 From: Hank Janssen <hjanssen@microsoft.com>
4 Subject: Staging: hv: add the Hyper-V virtual storage driver
5
6 From: Hank Janssen <hjanssen@microsoft.com>
7
8 This is the virtual storage driver when running Linux on top of Hyper-V.
9
10 Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
11 Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
12 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
13 ---
14 drivers/staging/hv/StorVsc.c | 967 ++++++++++++++++++++++++++
15 drivers/staging/hv/storvsc_drv.c | 1413 +++++++++++++++++++++++++++++++++++++++
16 2 files changed, 2380 insertions(+)
17
18 --- /dev/null
19 +++ b/drivers/staging/hv/StorVsc.c
20 @@ -0,0 +1,967 @@
21 +/*
22 + *
23 + * Copyright (c) 2009, Microsoft Corporation.
24 + *
25 + * This program is free software; you can redistribute it and/or modify it
26 + * under the terms and conditions of the GNU General Public License,
27 + * version 2, as published by the Free Software Foundation.
28 + *
29 + * This program is distributed in the hope it will be useful, but WITHOUT
30 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
31 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
32 + * more details.
33 + *
34 + * You should have received a copy of the GNU General Public License along with
35 + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
36 + * Place - Suite 330, Boston, MA 02111-1307 USA.
37 + *
38 + * Authors:
39 + * Haiyang Zhang <haiyangz@microsoft.com>
40 + * Hank Janssen <hjanssen@microsoft.com>
41 + *
42 + */
43 +
44 +
45 +#include "logging.h"
46 +
47 +#include "StorVscApi.h"
48 +#include "VmbusPacketFormat.h"
49 +#include "vstorage.h"
50 +
51 +
52 +//
53 +// #defines
54 +//
55 +
56 +//
57 +// Data types
58 +//
59 +
60 +typedef struct _STORVSC_REQUEST_EXTENSION {
61 + //LIST_ENTRY ListEntry;
62 +
63 + STORVSC_REQUEST *Request;
64 + DEVICE_OBJECT *Device;
65 +
66 + // Synchronize the request/response if needed
67 + HANDLE WaitEvent;
68 +
69 + VSTOR_PACKET VStorPacket;
70 +} STORVSC_REQUEST_EXTENSION;
71 +
72 +
73 +// A storvsc device is a device object that contains a vmbus channel
74 +typedef struct _STORVSC_DEVICE{
75 + DEVICE_OBJECT *Device;
76 +
77 + int RefCount; // 0 indicates the device is being destroyed
78 +
79 + int NumOutstandingRequests;
80 +
81 + // Each unique Port/Path/Target represents 1 channel ie scsi controller. In reality, the pathid, targetid is always 0
82 + // and the port is set by us
83 + ULONG PortNumber;
84 + UCHAR PathId;
85 + UCHAR TargetId;
86 +
87 + //LIST_ENTRY OutstandingRequestList;
88 + //HANDLE OutstandingRequestLock;
89 +
90 + // Used for vsc/vsp channel reset process
91 + STORVSC_REQUEST_EXTENSION InitRequest;
92 +
93 + STORVSC_REQUEST_EXTENSION ResetRequest;
94 +
95 +} STORVSC_DEVICE;
96 +
97 +
98 +//
99 +// Globals
100 +//
101 +static const char* gDriverName="storvsc";
102 +
103 +//{ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
104 +static const GUID gStorVscDeviceType={
105 + .Data = {0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f}
106 +};
107 +
108 +//
109 +// Internal routines
110 +//
111 +static int
112 +StorVscOnDeviceAdd(
113 + DEVICE_OBJECT *Device,
114 + void *AdditionalInfo
115 + );
116 +
117 +static int
118 +StorVscOnDeviceRemove(
119 + DEVICE_OBJECT *Device
120 + );
121 +
122 +static int
123 +StorVscOnIORequest(
124 + DEVICE_OBJECT *Device,
125 + STORVSC_REQUEST *Request
126 + );
127 +
128 +static int
129 +StorVscOnHostReset(
130 + DEVICE_OBJECT *Device
131 + );
132 +
133 +static void
134 +StorVscOnCleanup(
135 + DRIVER_OBJECT *Device
136 + );
137 +
138 +static void
139 +StorVscOnChannelCallback(
140 + PVOID Context
141 + );
142 +
143 +static void
144 +StorVscOnIOCompletion(
145 + DEVICE_OBJECT *Device,
146 + VSTOR_PACKET *VStorPacket,
147 + STORVSC_REQUEST_EXTENSION *RequestExt
148 + );
149 +
150 +static void
151 +StorVscOnReceive(
152 + DEVICE_OBJECT *Device,
153 + VSTOR_PACKET *VStorPacket,
154 + STORVSC_REQUEST_EXTENSION *RequestExt
155 + );
156 +
157 +static int
158 +StorVscConnectToVsp(
159 + DEVICE_OBJECT *Device
160 + );
161 +
162 +static inline STORVSC_DEVICE* AllocStorDevice(DEVICE_OBJECT *Device)
163 +{
164 + STORVSC_DEVICE *storDevice;
165 +
166 + storDevice = MemAllocZeroed(sizeof(STORVSC_DEVICE));
167 + if (!storDevice)
168 + return NULL;
169 +
170 + // Set to 2 to allow both inbound and outbound traffics
171 + // (ie GetStorDevice() and MustGetStorDevice()) to proceed.
172 + InterlockedCompareExchange(&storDevice->RefCount, 2, 0);
173 +
174 + storDevice->Device = Device;
175 + Device->Extension = storDevice;
176 +
177 + return storDevice;
178 +}
179 +
180 +static inline void FreeStorDevice(STORVSC_DEVICE *Device)
181 +{
182 + ASSERT(Device->RefCount == 0);
183 + MemFree(Device);
184 +}
185 +
186 +// Get the stordevice object iff exists and its refcount > 1
187 +static inline STORVSC_DEVICE* GetStorDevice(DEVICE_OBJECT *Device)
188 +{
189 + STORVSC_DEVICE *storDevice;
190 +
191 + storDevice = (STORVSC_DEVICE*)Device->Extension;
192 + if (storDevice && storDevice->RefCount > 1)
193 + {
194 + InterlockedIncrement(&storDevice->RefCount);
195 + }
196 + else
197 + {
198 + storDevice = NULL;
199 + }
200 +
201 + return storDevice;
202 +}
203 +
204 +// Get the stordevice object iff exists and its refcount > 0
205 +static inline STORVSC_DEVICE* MustGetStorDevice(DEVICE_OBJECT *Device)
206 +{
207 + STORVSC_DEVICE *storDevice;
208 +
209 + storDevice = (STORVSC_DEVICE*)Device->Extension;
210 + if (storDevice && storDevice->RefCount)
211 + {
212 + InterlockedIncrement(&storDevice->RefCount);
213 + }
214 + else
215 + {
216 + storDevice = NULL;
217 + }
218 +
219 + return storDevice;
220 +}
221 +
222 +static inline void PutStorDevice(DEVICE_OBJECT *Device)
223 +{
224 + STORVSC_DEVICE *storDevice;
225 +
226 + storDevice = (STORVSC_DEVICE*)Device->Extension;
227 + ASSERT(storDevice);
228 +
229 + InterlockedDecrement(&storDevice->RefCount);
230 + ASSERT(storDevice->RefCount);
231 +}
232 +
233 +// Drop ref count to 1 to effectively disable GetStorDevice()
234 +static inline STORVSC_DEVICE* ReleaseStorDevice(DEVICE_OBJECT *Device)
235 +{
236 + STORVSC_DEVICE *storDevice;
237 +
238 + storDevice = (STORVSC_DEVICE*)Device->Extension;
239 + ASSERT(storDevice);
240 +
241 + // Busy wait until the ref drop to 2, then set it to 1
242 + while (InterlockedCompareExchange(&storDevice->RefCount, 1, 2) != 2)
243 + {
244 + Sleep(100);
245 + }
246 +
247 + return storDevice;
248 +}
249 +
250 +// Drop ref count to 0. No one can use StorDevice object.
251 +static inline STORVSC_DEVICE* FinalReleaseStorDevice(DEVICE_OBJECT *Device)
252 +{
253 + STORVSC_DEVICE *storDevice;
254 +
255 + storDevice = (STORVSC_DEVICE*)Device->Extension;
256 + ASSERT(storDevice);
257 +
258 + // Busy wait until the ref drop to 1, then set it to 0
259 + while (InterlockedCompareExchange(&storDevice->RefCount, 0, 1) != 1)
260 + {
261 + Sleep(100);
262 + }
263 +
264 + Device->Extension = NULL;
265 + return storDevice;
266 +}
267 +
268 +/*++;
269 +
270 +
271 +Name:
272 + StorVscInitialize()
273 +
274 +Description:
275 + Main entry point
276 +
277 +--*/
278 +int
279 +StorVscInitialize(
280 + DRIVER_OBJECT *Driver
281 + )
282 +{
283 + STORVSC_DRIVER_OBJECT* storDriver = (STORVSC_DRIVER_OBJECT*)Driver;
284 + int ret=0;
285 +
286 + DPRINT_ENTER(STORVSC);
287 +
288 + DPRINT_DBG(STORVSC, "sizeof(STORVSC_REQUEST)=%d sizeof(STORVSC_REQUEST_EXTENSION)=%d sizeof(VSTOR_PACKET)=%d, sizeof(VMSCSI_REQUEST)=%d",
289 + sizeof(STORVSC_REQUEST), sizeof(STORVSC_REQUEST_EXTENSION), sizeof(VSTOR_PACKET), sizeof(VMSCSI_REQUEST));
290 +
291 + // Make sure we are at least 2 pages since 1 page is used for control
292 + ASSERT(storDriver->RingBufferSize >= (PAGE_SIZE << 1));
293 +
294 + Driver->name = gDriverName;
295 + memcpy(&Driver->deviceType, &gStorVscDeviceType, sizeof(GUID));
296 +
297 + storDriver->RequestExtSize = sizeof(STORVSC_REQUEST_EXTENSION);
298 +
299 + // Divide the ring buffer data size (which is 1 page less than the ring buffer size since that page is reserved for the ring buffer indices)
300 + // by the max request size (which is VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER + VSTOR_PACKET + UINT64)
301 + storDriver->MaxOutstandingRequestsPerChannel =
302 + ((storDriver->RingBufferSize - PAGE_SIZE) / ALIGN_UP(MAX_MULTIPAGE_BUFFER_PACKET + sizeof(VSTOR_PACKET) + sizeof(UINT64),sizeof(UINT64)));
303 +
304 + DPRINT_INFO(STORVSC, "max io %u, currently %u\n", storDriver->MaxOutstandingRequestsPerChannel, STORVSC_MAX_IO_REQUESTS);
305 +
306 + // Setup the dispatch table
307 + storDriver->Base.OnDeviceAdd = StorVscOnDeviceAdd;
308 + storDriver->Base.OnDeviceRemove = StorVscOnDeviceRemove;
309 + storDriver->Base.OnCleanup = StorVscOnCleanup;
310 +
311 + storDriver->OnIORequest = StorVscOnIORequest;
312 + storDriver->OnHostReset = StorVscOnHostReset;
313 +
314 + DPRINT_EXIT(STORVSC);
315 +
316 + return ret;
317 +}
318 +
319 +/*++
320 +
321 +Name:
322 + StorVscOnDeviceAdd()
323 +
324 +Description:
325 + Callback when the device belonging to this driver is added
326 +
327 +--*/
328 +int
329 +StorVscOnDeviceAdd(
330 + DEVICE_OBJECT *Device,
331 + void *AdditionalInfo
332 + )
333 +{
334 + int ret=0;
335 + STORVSC_DEVICE *storDevice;
336 + //VMSTORAGE_CHANNEL_PROPERTIES *props;
337 + STORVSC_DEVICE_INFO *deviceInfo = (STORVSC_DEVICE_INFO*)AdditionalInfo;
338 +
339 + DPRINT_ENTER(STORVSC);
340 +
341 + storDevice = AllocStorDevice(Device);
342 + if (!storDevice)
343 + {
344 + ret = -1;
345 + goto Cleanup;
346 + }
347 +
348 + // Save the channel properties to our storvsc channel
349 + //props = (VMSTORAGE_CHANNEL_PROPERTIES*) channel->offerMsg.Offer.u.Standard.UserDefined;
350 +
351 + // FIXME:
352 + // If we support more than 1 scsi channel, we need to set the port number here
353 + // to the scsi channel but how do we get the scsi channel prior to the bus scan
354 + /*storChannel->PortNumber = 0;
355 + storChannel->PathId = props->PathId;
356 + storChannel->TargetId = props->TargetId;*/
357 +
358 + storDevice->PortNumber = deviceInfo->PortNumber;
359 + // Send it back up
360 + ret = StorVscConnectToVsp(Device);
361 +
362 + //deviceInfo->PortNumber = storDevice->PortNumber;
363 + deviceInfo->PathId = storDevice->PathId;
364 + deviceInfo->TargetId = storDevice->TargetId;
365 +
366 + DPRINT_DBG(STORVSC, "assigned port %u, path %u target %u\n", storDevice->PortNumber, storDevice->PathId, storDevice->TargetId);
367 +
368 +Cleanup:
369 + DPRINT_EXIT(STORVSC);
370 +
371 + return ret;
372 +}
373 +
374 +static int StorVscChannelInit(DEVICE_OBJECT *Device)
375 +{
376 + int ret=0;
377 + STORVSC_DEVICE *storDevice;
378 + STORVSC_REQUEST_EXTENSION *request;
379 + VSTOR_PACKET *vstorPacket;
380 +
381 + storDevice = GetStorDevice(Device);
382 + if (!storDevice)
383 + {
384 + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?");
385 + DPRINT_EXIT(STORVSC);
386 + return -1;
387 + }
388 +
389 + request = &storDevice->InitRequest;
390 + vstorPacket = &request->VStorPacket;
391 +
392 + // Now, initiate the vsc/vsp initialization protocol on the open channel
393 +
394 + memset(request, sizeof(STORVSC_REQUEST_EXTENSION), 0);
395 + request->WaitEvent = WaitEventCreate();
396 +
397 + vstorPacket->Operation = VStorOperationBeginInitialization;
398 + vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
399 +
400 + /*SpinlockAcquire(gDriverExt.packetListLock);
401 + INSERT_TAIL_LIST(&gDriverExt.packetList, &packet->listEntry.entry);
402 + SpinlockRelease(gDriverExt.packetListLock);*/
403 +
404 + DPRINT_INFO(STORVSC, "BEGIN_INITIALIZATION_OPERATION...");
405 +
406 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
407 + vstorPacket,
408 + sizeof(VSTOR_PACKET),
409 + (ULONG_PTR)request,
410 + VmbusPacketTypeDataInBand,
411 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
412 + if ( ret != 0)
413 + {
414 + DPRINT_ERR(STORVSC, "unable to send BEGIN_INITIALIZATION_OPERATION");
415 + goto Cleanup;
416 + }
417 +
418 + WaitEventWait(request->WaitEvent);
419 +
420 + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0)
421 + {
422 + DPRINT_ERR(STORVSC, "BEGIN_INITIALIZATION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status);
423 + goto Cleanup;
424 + }
425 +
426 + DPRINT_INFO(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION...");
427 +
428 + // reuse the packet for version range supported
429 + memset(vstorPacket, sizeof(VSTOR_PACKET), 0);
430 + vstorPacket->Operation = VStorOperationQueryProtocolVersion;
431 + vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
432 +
433 + vstorPacket->Version.MajorMinor = VMSTOR_PROTOCOL_VERSION_CURRENT;
434 + FILL_VMSTOR_REVISION(vstorPacket->Version.Revision);
435 +
436 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
437 + vstorPacket,
438 + sizeof(VSTOR_PACKET),
439 + (ULONG_PTR)request,
440 + VmbusPacketTypeDataInBand,
441 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
442 + if ( ret != 0)
443 + {
444 + DPRINT_ERR(STORVSC, "unable to send BEGIN_INITIALIZATION_OPERATION");
445 + goto Cleanup;
446 + }
447 +
448 + WaitEventWait(request->WaitEvent);
449 +
450 + // TODO: Check returned version
451 + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0)
452 + {
453 + DPRINT_ERR(STORVSC, "QUERY_PROTOCOL_VERSION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status);
454 + goto Cleanup;
455 + }
456 +
457 + // Query channel properties
458 + DPRINT_INFO(STORVSC, "QUERY_PROPERTIES_OPERATION...");
459 +
460 + memset(vstorPacket, sizeof(VSTOR_PACKET), 0);
461 + vstorPacket->Operation = VStorOperationQueryProperties;
462 + vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
463 + vstorPacket->StorageChannelProperties.PortNumber = storDevice->PortNumber;
464 +
465 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
466 + vstorPacket,
467 + sizeof(VSTOR_PACKET),
468 + (ULONG_PTR)request,
469 + VmbusPacketTypeDataInBand,
470 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
471 +
472 + if ( ret != 0)
473 + {
474 + DPRINT_ERR(STORVSC, "unable to send QUERY_PROPERTIES_OPERATION");
475 + goto Cleanup;
476 + }
477 +
478 + WaitEventWait(request->WaitEvent);
479 +
480 + // TODO: Check returned version
481 + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0)
482 + {
483 + DPRINT_ERR(STORVSC, "QUERY_PROPERTIES_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status);
484 + goto Cleanup;
485 + }
486 +
487 + //storDevice->PortNumber = vstorPacket->StorageChannelProperties.PortNumber;
488 + storDevice->PathId = vstorPacket->StorageChannelProperties.PathId;
489 + storDevice->TargetId = vstorPacket->StorageChannelProperties.TargetId;
490 +
491 + DPRINT_DBG(STORVSC, "channel flag 0x%x, max xfer len 0x%x", vstorPacket->StorageChannelProperties.Flags, vstorPacket->StorageChannelProperties.MaxTransferBytes);
492 +
493 + DPRINT_INFO(STORVSC, "END_INITIALIZATION_OPERATION...");
494 +
495 + memset(vstorPacket, sizeof(VSTOR_PACKET), 0);
496 + vstorPacket->Operation = VStorOperationEndInitialization;
497 + vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
498 +
499 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
500 + vstorPacket,
501 + sizeof(VSTOR_PACKET),
502 + (ULONG_PTR)request,
503 + VmbusPacketTypeDataInBand,
504 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
505 +
506 + if ( ret != 0)
507 + {
508 + DPRINT_ERR(STORVSC, "unable to send END_INITIALIZATION_OPERATION");
509 + goto Cleanup;
510 + }
511 +
512 + WaitEventWait(request->WaitEvent);
513 +
514 + if (vstorPacket->Operation != VStorOperationCompleteIo || vstorPacket->Status != 0)
515 + {
516 + DPRINT_ERR(STORVSC, "END_INITIALIZATION_OPERATION failed (op %d status 0x%x)", vstorPacket->Operation, vstorPacket->Status);
517 + goto Cleanup;
518 + }
519 +
520 + DPRINT_INFO(STORVSC, "**** storage channel up and running!! ****");
521 +
522 +Cleanup:
523 + if (request->WaitEvent)
524 + {
525 + WaitEventClose(request->WaitEvent);
526 + request->WaitEvent = NULL;
527 + }
528 +
529 + PutStorDevice(Device);
530 +
531 + DPRINT_EXIT(STORVSC);
532 + return ret;
533 +}
534 +
535 +
536 +int
537 +StorVscConnectToVsp(
538 + DEVICE_OBJECT *Device
539 + )
540 +{
541 + int ret=0;
542 + VMSTORAGE_CHANNEL_PROPERTIES props;
543 +
544 + STORVSC_DRIVER_OBJECT *storDriver = (STORVSC_DRIVER_OBJECT*) Device->Driver;;
545 +
546 + memset(&props, sizeof(VMSTORAGE_CHANNEL_PROPERTIES), 0);
547 +
548 + // Open the channel
549 + ret = Device->Driver->VmbusChannelInterface.Open(Device,
550 + storDriver->RingBufferSize,
551 + storDriver->RingBufferSize,
552 + (PVOID)&props,
553 + sizeof(VMSTORAGE_CHANNEL_PROPERTIES),
554 + StorVscOnChannelCallback,
555 + Device
556 + );
557 +
558 + DPRINT_DBG(STORVSC, "storage props: path id %d, tgt id %d, max xfer %d", props.PathId, props.TargetId, props.MaxTransferBytes);
559 +
560 + if (ret != 0)
561 + {
562 + DPRINT_ERR(STORVSC, "unable to open channel: %d", ret);
563 + return -1;
564 + }
565 +
566 + ret = StorVscChannelInit(Device);
567 +
568 + return ret;
569 +}
570 +
571 +
572 +/*++
573 +
574 +Name:
575 + StorVscOnDeviceRemove()
576 +
577 +Description:
578 + Callback when the our device is being removed
579 +
580 +--*/
581 +int
582 +StorVscOnDeviceRemove(
583 + DEVICE_OBJECT *Device
584 + )
585 +{
586 + STORVSC_DEVICE *storDevice;
587 + int ret=0;
588 +
589 + DPRINT_ENTER(STORVSC);
590 +
591 + DPRINT_INFO(STORVSC, "disabling storage device (%p)...", Device->Extension);
592 +
593 + storDevice = ReleaseStorDevice(Device);
594 +
595 + // At this point, all outbound traffic should be disable. We only allow inbound traffic (responses) to proceed
596 + // so that outstanding requests can be completed.
597 + while (storDevice->NumOutstandingRequests)
598 + {
599 + DPRINT_INFO(STORVSC, "waiting for %d requests to complete...", storDevice->NumOutstandingRequests);
600 +
601 + Sleep(100);
602 + }
603 +
604 + DPRINT_INFO(STORVSC, "removing storage device (%p)...", Device->Extension);
605 +
606 + storDevice = FinalReleaseStorDevice(Device);
607 +
608 + DPRINT_INFO(STORVSC, "storage device (%p) safe to remove", storDevice);
609 +
610 + // Close the channel
611 + Device->Driver->VmbusChannelInterface.Close(Device);
612 +
613 + FreeStorDevice(storDevice);
614 +
615 + DPRINT_EXIT(STORVSC);
616 + return ret;
617 +}
618 +
619 +
620 +//static void
621 +//StorVscOnTargetRescan(
622 +// void *Context
623 +// )
624 +//{
625 +// DEVICE_OBJECT *device=(DEVICE_OBJECT*)Context;
626 +// STORVSC_DRIVER_OBJECT *storDriver;
627 +//
628 +// DPRINT_ENTER(STORVSC);
629 +//
630 +// storDriver = (STORVSC_DRIVER_OBJECT*) device->Driver;
631 +// storDriver->OnHostRescan(device);
632 +//
633 +// DPRINT_EXIT(STORVSC);
634 +//}
635 +
636 +int
637 +StorVscOnHostReset(
638 + DEVICE_OBJECT *Device
639 + )
640 +{
641 + int ret=0;
642 +
643 + STORVSC_DEVICE *storDevice;
644 + STORVSC_REQUEST_EXTENSION *request;
645 + VSTOR_PACKET *vstorPacket;
646 +
647 + DPRINT_ENTER(STORVSC);
648 +
649 + DPRINT_INFO(STORVSC, "resetting host adapter...");
650 +
651 + storDevice = GetStorDevice(Device);
652 + if (!storDevice)
653 + {
654 + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?");
655 + DPRINT_EXIT(STORVSC);
656 + return -1;
657 + }
658 +
659 + request = &storDevice->ResetRequest;
660 + vstorPacket = &request->VStorPacket;
661 +
662 + request->WaitEvent = WaitEventCreate();
663 +
664 + vstorPacket->Operation = VStorOperationResetBus;
665 + vstorPacket->Flags = REQUEST_COMPLETION_FLAG;
666 + vstorPacket->VmSrb.PathId = storDevice->PathId;
667 +
668 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
669 + vstorPacket,
670 + sizeof(VSTOR_PACKET),
671 + (ULONG_PTR)&storDevice->ResetRequest,
672 + VmbusPacketTypeDataInBand,
673 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
674 + if (ret != 0)
675 + {
676 + DPRINT_ERR(STORVSC, "Unable to send reset packet %p ret %d", vstorPacket, ret);
677 + goto Cleanup;
678 + }
679 +
680 + // FIXME: Add a timeout
681 + WaitEventWait(request->WaitEvent);
682 +
683 + WaitEventClose(request->WaitEvent);
684 + DPRINT_INFO(STORVSC, "host adapter reset completed");
685 +
686 + // At this point, all outstanding requests in the adapter should have been flushed out and return to us
687 +
688 +Cleanup:
689 + PutStorDevice(Device);
690 + DPRINT_EXIT(STORVSC);
691 + return ret;
692 +}
693 +
694 +/*++
695 +
696 +Name:
697 + StorVscOnIORequest()
698 +
699 +Description:
700 + Callback to initiate an I/O request
701 +
702 +--*/
703 +int
704 +StorVscOnIORequest(
705 + DEVICE_OBJECT *Device,
706 + STORVSC_REQUEST *Request
707 + )
708 +{
709 + STORVSC_DEVICE *storDevice;
710 + STORVSC_REQUEST_EXTENSION* requestExtension = (STORVSC_REQUEST_EXTENSION*) Request->Extension;
711 + VSTOR_PACKET* vstorPacket =&requestExtension->VStorPacket;
712 + int ret=0;
713 +
714 + DPRINT_ENTER(STORVSC);
715 +
716 + storDevice = GetStorDevice(Device);
717 +
718 + DPRINT_DBG(STORVSC, "enter - Device %p, DeviceExt %p, Request %p, Extension %p",
719 + Device, storDevice, Request, requestExtension);
720 +
721 + DPRINT_DBG(STORVSC, "req %p len %d bus %d, target %d, lun %d cdblen %d",
722 + Request, Request->DataBuffer.Length, Request->Bus, Request->TargetId, Request->LunId, Request->CdbLen);
723 +
724 + if (!storDevice)
725 + {
726 + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?");
727 + DPRINT_EXIT(STORVSC);
728 + return -2;
729 + }
730 +
731 + //PrintBytes(Request->Cdb, Request->CdbLen);
732 +
733 + requestExtension->Request = Request;
734 + requestExtension->Device = Device;
735 +
736 + memset(vstorPacket, 0 , sizeof(VSTOR_PACKET));
737 +
738 + vstorPacket->Flags |= REQUEST_COMPLETION_FLAG;
739 +
740 + vstorPacket->VmSrb.Length = sizeof(VMSCSI_REQUEST);
741 +
742 + vstorPacket->VmSrb.PortNumber = Request->Host;
743 + vstorPacket->VmSrb.PathId = Request->Bus;
744 + vstorPacket->VmSrb.TargetId = Request->TargetId;
745 + vstorPacket->VmSrb.Lun = Request->LunId;
746 +
747 + vstorPacket->VmSrb.SenseInfoLength = SENSE_BUFFER_SIZE;
748 +
749 + // Copy over the scsi command descriptor block
750 + vstorPacket->VmSrb.CdbLength = Request->CdbLen;
751 + memcpy(&vstorPacket->VmSrb.Cdb, Request->Cdb, Request->CdbLen);
752 +
753 + vstorPacket->VmSrb.DataIn = Request->Type;
754 + vstorPacket->VmSrb.DataTransferLength = Request->DataBuffer.Length;
755 +
756 + vstorPacket->Operation = VStorOperationExecuteSRB;
757 +
758 + DPRINT_DBG(STORVSC, "srb - len %d port %d, path %d, target %d, lun %d senselen %d cdblen %d",
759 + vstorPacket->VmSrb.Length,
760 + vstorPacket->VmSrb.PortNumber,
761 + vstorPacket->VmSrb.PathId,
762 + vstorPacket->VmSrb.TargetId,
763 + vstorPacket->VmSrb.Lun,
764 + vstorPacket->VmSrb.SenseInfoLength,
765 + vstorPacket->VmSrb.CdbLength);
766 +
767 + if (requestExtension->Request->DataBuffer.Length)
768 + {
769 + ret = Device->Driver->VmbusChannelInterface.SendPacketMultiPageBuffer(Device,
770 + &requestExtension->Request->DataBuffer,
771 + vstorPacket,
772 + sizeof(VSTOR_PACKET),
773 + (ULONG_PTR)requestExtension);
774 + }
775 + else
776 + {
777 + ret = Device->Driver->VmbusChannelInterface.SendPacket(Device,
778 + vstorPacket,
779 + sizeof(VSTOR_PACKET),
780 + (ULONG_PTR)requestExtension,
781 + VmbusPacketTypeDataInBand,
782 + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
783 + }
784 +
785 + if (ret != 0)
786 + {
787 + DPRINT_DBG(STORVSC, "Unable to send packet %p ret %d", vstorPacket, ret);
788 + }
789 +
790 + InterlockedIncrement(&storDevice->NumOutstandingRequests);
791 +
792 + PutStorDevice(Device);
793 +
794 + DPRINT_EXIT(STORVSC);
795 + return ret;
796 +}
797 +
798 +/*++
799 +
800 +Name:
801 + StorVscOnCleanup()
802 +
803 +Description:
804 + Perform any cleanup when the driver is removed
805 +
806 +--*/
807 +void
808 +StorVscOnCleanup(
809 + DRIVER_OBJECT *Driver
810 + )
811 +{
812 + DPRINT_ENTER(STORVSC);
813 + DPRINT_EXIT(STORVSC);
814 +}
815 +
816 +
817 +static void
818 +StorVscOnIOCompletion(
819 + DEVICE_OBJECT *Device,
820 + VSTOR_PACKET *VStorPacket,
821 + STORVSC_REQUEST_EXTENSION *RequestExt
822 + )
823 +{
824 + STORVSC_REQUEST *request;
825 + STORVSC_DEVICE *storDevice;
826 +
827 + DPRINT_ENTER(STORVSC);
828 +
829 + storDevice = MustGetStorDevice(Device);
830 + if (!storDevice)
831 + {
832 + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?");
833 + DPRINT_EXIT(STORVSC);
834 + return;
835 + }
836 +
837 + DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION - request extension %p completed bytes xfer %u",
838 + RequestExt, VStorPacket->VmSrb.DataTransferLength);
839 +
840 + ASSERT(RequestExt != NULL);
841 + ASSERT(RequestExt->Request != NULL);
842 +
843 + request = RequestExt->Request;
844 +
845 + ASSERT(request->OnIOCompletion != NULL);
846 +
847 + // Copy over the status...etc
848 + request->Status = VStorPacket->VmSrb.ScsiStatus;
849 +
850 + if (request->Status != 0 || VStorPacket->VmSrb.SrbStatus != 1)
851 + {
852 + DPRINT_WARN(STORVSC, "cmd 0x%x scsi status 0x%x srb status 0x%x\n",
853 + request->Cdb[0],
854 + VStorPacket->VmSrb.ScsiStatus,
855 + VStorPacket->VmSrb.SrbStatus);
856 + }
857 +
858 + if ((request->Status & 0xFF) == 0x02) // CHECK_CONDITION
859 + {
860 + if (VStorPacket->VmSrb.SrbStatus & 0x80) // autosense data available
861 + {
862 + DPRINT_WARN(STORVSC, "storvsc pkt %p autosense data valid - len %d\n",
863 + RequestExt, VStorPacket->VmSrb.SenseInfoLength);
864 +
865 + ASSERT(VStorPacket->VmSrb.SenseInfoLength <= request->SenseBufferSize);
866 + memcpy(request->SenseBuffer,
867 + VStorPacket->VmSrb.SenseData,
868 + VStorPacket->VmSrb.SenseInfoLength);
869 +
870 + request->SenseBufferSize = VStorPacket->VmSrb.SenseInfoLength;
871 + }
872 + }
873 +
874 + // TODO:
875 + request->BytesXfer = VStorPacket->VmSrb.DataTransferLength;
876 +
877 + request->OnIOCompletion(request);
878 +
879 + InterlockedDecrement(&storDevice->NumOutstandingRequests);
880 +
881 + PutStorDevice(Device);
882 +
883 + DPRINT_EXIT(STORVSC);
884 +}
885 +
886 +
887 +static void
888 +StorVscOnReceive(
889 + DEVICE_OBJECT *Device,
890 + VSTOR_PACKET *VStorPacket,
891 + STORVSC_REQUEST_EXTENSION *RequestExt
892 + )
893 +{
894 + switch(VStorPacket->Operation)
895 + {
896 + case VStorOperationCompleteIo:
897 +
898 + DPRINT_DBG(STORVSC, "IO_COMPLETE_OPERATION");
899 + StorVscOnIOCompletion(Device, VStorPacket, RequestExt);
900 + break;
901 +
902 + //case ENUMERATE_DEVICE_OPERATION:
903 +
904 + // DPRINT_INFO(STORVSC, "ENUMERATE_DEVICE_OPERATION");
905 +
906 + // StorVscOnTargetRescan(Device);
907 + // break;
908 +
909 + case VStorOperationRemoveDevice:
910 +
911 + DPRINT_INFO(STORVSC, "REMOVE_DEVICE_OPERATION");
912 + // TODO:
913 + break;
914 +
915 + default:
916 + DPRINT_INFO(STORVSC, "Unknown operation received - %d", VStorPacket->Operation);
917 + break;
918 + }
919 +}
920 +
921 +void
922 +StorVscOnChannelCallback(
923 + PVOID Context
924 + )
925 +{
926 + int ret=0;
927 + DEVICE_OBJECT *device = (DEVICE_OBJECT*)Context;
928 + STORVSC_DEVICE *storDevice;
929 + UINT32 bytesRecvd;
930 + UINT64 requestId;
931 + UCHAR packet[ALIGN_UP(sizeof(VSTOR_PACKET),8)];
932 + STORVSC_REQUEST_EXTENSION *request;
933 +
934 + DPRINT_ENTER(STORVSC);
935 +
936 + ASSERT(device);
937 +
938 + storDevice = MustGetStorDevice(device);
939 + if (!storDevice)
940 + {
941 + DPRINT_ERR(STORVSC, "unable to get stor device...device being destroyed?");
942 + DPRINT_EXIT(STORVSC);
943 + return;
944 + }
945 +
946 + do
947 + {
948 + ret = device->Driver->VmbusChannelInterface.RecvPacket(device,
949 + packet,
950 + ALIGN_UP(sizeof(VSTOR_PACKET),8),
951 + &bytesRecvd,
952 + &requestId);
953 + if (ret == 0 && bytesRecvd > 0)
954 + {
955 + DPRINT_DBG(STORVSC, "receive %d bytes - tid %llx", bytesRecvd, requestId);
956 +
957 + //ASSERT(bytesRecvd == sizeof(VSTOR_PACKET));
958 +
959 + request = (STORVSC_REQUEST_EXTENSION*)(ULONG_PTR)requestId;
960 + ASSERT(request);
961 +
962 + //if (vstorPacket.Flags & SYNTHETIC_FLAG)
963 + if ((request == &storDevice->InitRequest) || (request == &storDevice->ResetRequest))
964 + {
965 + //DPRINT_INFO(STORVSC, "reset completion - operation %u status %u", vstorPacket.Operation, vstorPacket.Status);
966 +
967 + memcpy(&request->VStorPacket, packet, sizeof(VSTOR_PACKET));
968 +
969 + WaitEventSet(request->WaitEvent);
970 + }
971 + else
972 + {
973 + StorVscOnReceive(device, (VSTOR_PACKET*)packet, request);
974 + }
975 + }
976 + else
977 + {
978 + //DPRINT_DBG(STORVSC, "nothing else to read...");
979 + break;
980 + }
981 + } while (1);
982 +
983 + PutStorDevice(device);
984 +
985 + DPRINT_EXIT(STORVSC);
986 + return;
987 +}
988 --- /dev/null
989 +++ b/drivers/staging/hv/storvsc_drv.c
990 @@ -0,0 +1,1413 @@
991 +/*
992 + *
993 + * Copyright (c) 2009, Microsoft Corporation.
994 + *
995 + * This program is free software; you can redistribute it and/or modify it
996 + * under the terms and conditions of the GNU General Public License,
997 + * version 2, as published by the Free Software Foundation.
998 + *
999 + * This program is distributed in the hope it will be useful, but WITHOUT
1000 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1001 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
1002 + * more details.
1003 + *
1004 + * You should have received a copy of the GNU General Public License along with
1005 + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
1006 + * Place - Suite 330, Boston, MA 02111-1307 USA.
1007 + *
1008 + * Authors:
1009 + * Haiyang Zhang <haiyangz@microsoft.com>
1010 + * Hank Janssen <hjanssen@microsoft.com>
1011 + *
1012 + */
1013 +
1014 +
1015 +#include <linux/init.h>
1016 +#include <linux/module.h>
1017 +#include <linux/device.h>
1018 +#include <linux/blkdev.h>
1019 +
1020 +#include <scsi/scsi.h>
1021 +#include <scsi/scsi_cmnd.h>
1022 +#include <scsi/scsi_host.h>
1023 +#include <scsi/scsi_device.h>
1024 +#include <scsi/scsi_tcq.h>
1025 +#include <scsi/scsi_eh.h>
1026 +#include <scsi/scsi_devinfo.h>
1027 +
1028 +#ifdef KERNEL_2_6_5
1029 +#else
1030 +#include <scsi/scsi_dbg.h>
1031 +#endif
1032 +
1033 +#include "logging.h"
1034 +#include "vmbus.h"
1035 +
1036 +#include "StorVscApi.h"
1037 +
1038 +//
1039 +// #defines
1040 +//
1041 +
1042 +//
1043 +// Data types
1044 +//
1045 +struct host_device_context {
1046 + struct work_struct host_rescan_work; //must be 1st field
1047 + struct device_context *device_ctx; // point back to our device context
1048 +#ifdef KERNEL_2_6_27
1049 + struct kmem_cache *request_pool;
1050 +#else
1051 + kmem_cache_t *request_pool;
1052 +#endif
1053 + unsigned int port;
1054 + unsigned char path;
1055 + unsigned char target;
1056 +};
1057 +
1058 +struct storvsc_cmd_request {
1059 + struct list_head entry;
1060 + struct scsi_cmnd *cmd;
1061 +
1062 + unsigned int bounce_sgl_count;
1063 + struct scatterlist *bounce_sgl;
1064 +
1065 + STORVSC_REQUEST request;
1066 + // !!!DO NOT ADD ANYTHING BELOW HERE!!!
1067 + // The extension buffer falls right here and is pointed to by request.Extension;
1068 +};
1069 +
1070 +struct storvsc_driver_context {
1071 + // !! These must be the first 2 fields !!
1072 + struct driver_context drv_ctx;
1073 + STORVSC_DRIVER_OBJECT drv_obj;
1074 +};
1075 +
1076 +// Static decl
1077 +static int storvsc_probe(struct device *dev);
1078 +static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *));
1079 +static int storvsc_device_alloc(struct scsi_device *);
1080 +static int storvsc_device_configure(struct scsi_device *);
1081 +static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd);
1082 +#ifdef KERNEL_2_6_27
1083 +static void storvsc_host_rescan_callback(struct work_struct *work);
1084 +#else
1085 +static void storvsc_host_rescan_callback(void* context);
1086 +#endif
1087 +static void storvsc_host_rescan(DEVICE_OBJECT* device_obj);
1088 +static int storvsc_remove(struct device *dev);
1089 +
1090 +static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len);
1091 +static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count);
1092 +static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count);
1093 +static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count);
1094 +static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count);
1095 +
1096 +static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count);
1097 +static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info);
1098 +
1099 +
1100 +static int storvsc_ringbuffer_size = STORVSC_RING_BUFFER_SIZE;
1101 +
1102 +// The one and only one
1103 +static struct storvsc_driver_context g_storvsc_drv;
1104 +
1105 +// Scsi driver
1106 +static struct scsi_host_template scsi_driver = {
1107 + .module = THIS_MODULE,
1108 + .name = "storvsc_host_t",
1109 + .bios_param = storvsc_get_chs,
1110 + .queuecommand = storvsc_queuecommand,
1111 + .eh_host_reset_handler = storvsc_host_reset_handler,
1112 + .slave_alloc = storvsc_device_alloc,
1113 + .slave_configure = storvsc_device_configure,
1114 + .cmd_per_lun = 1,
1115 + .can_queue = STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS, // 64 max_queue * 1 target
1116 + .this_id = -1,
1117 + // no use setting to 0 since ll_blk_rw reset it to 1
1118 + .sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,// currently 32
1119 + // ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge into 1 sg element. If set, we must
1120 + // limit the max_segment_size to PAGE_SIZE, otherwise we may get 1 sg element that represents multiple
1121 + // physically contig pfns (ie sg[x].length > PAGE_SIZE).
1122 + .use_clustering = ENABLE_CLUSTERING,
1123 + // Make sure we dont get a sg segment crosses a page boundary
1124 + .dma_boundary = PAGE_SIZE-1,
1125 +};
1126 +
1127 +
1128 +/*++
1129 +
1130 +Name: storvsc_drv_init()
1131 +
1132 +Desc: StorVsc driver initialization.
1133 +
1134 +--*/
1135 +int storvsc_drv_init(PFN_DRIVERINITIALIZE pfn_drv_init)
1136 +{
1137 + int ret=0;
1138 + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj;
1139 + struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx;
1140 +
1141 + DPRINT_ENTER(STORVSC_DRV);
1142 +
1143 + vmbus_get_interface(&storvsc_drv_obj->Base.VmbusChannelInterface);
1144 +
1145 + storvsc_drv_obj->RingBufferSize = storvsc_ringbuffer_size;
1146 + storvsc_drv_obj->OnHostRescan = storvsc_host_rescan;
1147 +
1148 + // Callback to client driver to complete the initialization
1149 + pfn_drv_init(&storvsc_drv_obj->Base);
1150 +
1151 + DPRINT_INFO(STORVSC_DRV, "request extension size %u, max outstanding reqs %u", storvsc_drv_obj->RequestExtSize, storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
1152 +
1153 + if (storvsc_drv_obj->MaxOutstandingRequestsPerChannel < STORVSC_MAX_IO_REQUESTS)
1154 + {
1155 + DPRINT_ERR(STORVSC_DRV, "The number of outstanding io requests (%d) is larger than that supported (%d) internally.",
1156 + STORVSC_MAX_IO_REQUESTS, storvsc_drv_obj->MaxOutstandingRequestsPerChannel);
1157 + return -1;
1158 + }
1159 +
1160 + drv_ctx->driver.name = storvsc_drv_obj->Base.name;
1161 + memcpy(&drv_ctx->class_id, &storvsc_drv_obj->Base.deviceType, sizeof(GUID));
1162 +
1163 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
1164 + drv_ctx->driver.probe = storvsc_probe;
1165 + drv_ctx->driver.remove = storvsc_remove;
1166 +#else
1167 + drv_ctx->probe = storvsc_probe;
1168 + drv_ctx->remove = storvsc_remove;
1169 +#endif
1170 +
1171 + // The driver belongs to vmbus
1172 + vmbus_child_driver_register(drv_ctx);
1173 +
1174 + DPRINT_EXIT(STORVSC_DRV);
1175 +
1176 + return ret;
1177 +}
1178 +
1179 +
1180 +static int storvsc_drv_exit_cb(struct device *dev, void *data)
1181 +{
1182 + struct device **curr = (struct device **)data;
1183 + *curr = dev;
1184 + return 1; // stop iterating
1185 +}
1186 +
1187 +/*++
1188 +
1189 +Name: storvsc_drv_exit()
1190 +
1191 +Desc:
1192 +
1193 +--*/
1194 +void storvsc_drv_exit(void)
1195 +{
1196 + STORVSC_DRIVER_OBJECT *storvsc_drv_obj=&g_storvsc_drv.drv_obj;
1197 + struct driver_context *drv_ctx=&g_storvsc_drv.drv_ctx;
1198 +
1199 + struct device *current_dev=NULL;
1200 +
1201 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
1202 +#define driver_for_each_device(drv, start, data, fn) \
1203 + struct list_head *ptr, *n; \
1204 + list_for_each_safe(ptr, n, &((drv)->devices)) {\
1205 + struct device *curr_dev;\
1206 + curr_dev = list_entry(ptr, struct device, driver_list);\
1207 + fn(curr_dev, data);\
1208 + }
1209 +#endif // KERNEL_2_6_9
1210 +
1211 + DPRINT_ENTER(STORVSC_DRV);
1212 +
1213 + while (1)
1214 + {
1215 + current_dev = NULL;
1216 +
1217 + // Get the device
1218 + driver_for_each_device(&drv_ctx->driver, NULL, (void*)&current_dev, storvsc_drv_exit_cb);
1219 +
1220 + if (current_dev == NULL)
1221 + break;
1222 +
1223 + // Initiate removal from the top-down
1224 + device_unregister(current_dev);
1225 + }
1226 +
1227 + if (storvsc_drv_obj->Base.OnCleanup)
1228 + storvsc_drv_obj->Base.OnCleanup(&storvsc_drv_obj->Base);
1229 +
1230 + vmbus_child_driver_unregister(drv_ctx);
1231 +
1232 + DPRINT_EXIT(STORVSC_DRV);
1233 +
1234 + return;
1235 +}
1236 +
1237 +/*++
1238 +
1239 +Name: storvsc_probe()
1240 +
1241 +Desc: Add a new device for this driver
1242 +
1243 +--*/
1244 +static int storvsc_probe(struct device *device)
1245 +{
1246 + int ret=0;
1247 +
1248 + struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
1249 + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
1250 + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
1251 +
1252 + struct device_context *device_ctx = device_to_device_context(device);
1253 + DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
1254 +
1255 + struct Scsi_Host *host;
1256 + struct host_device_context *host_device_ctx;
1257 + STORVSC_DEVICE_INFO device_info;
1258 +
1259 + DPRINT_ENTER(STORVSC_DRV);
1260 +
1261 + if (!storvsc_drv_obj->Base.OnDeviceAdd)
1262 + return -1;
1263 +
1264 + host = scsi_host_alloc(&scsi_driver, sizeof(struct host_device_context));
1265 + if (!host)
1266 + {
1267 + DPRINT_ERR(STORVSC_DRV, "unable to allocate scsi host object");
1268 + return -ENOMEM;
1269 + }
1270 +
1271 + device->driver_data = host;
1272 +
1273 + host_device_ctx = (struct host_device_context*)host->hostdata;
1274 + memset(host_device_ctx, 0, sizeof(struct host_device_context));
1275 +
1276 + host_device_ctx->port = host->host_no;
1277 + host_device_ctx->device_ctx = device_ctx;
1278 +
1279 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
1280 +#elif defined(KERNEL_2_6_27)
1281 + INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback);
1282 +#else
1283 + INIT_WORK(&host_device_ctx->host_rescan_work, storvsc_host_rescan_callback, device_obj);
1284 +#endif
1285 +
1286 +#if defined(KERNEL_2_6_27)
1287 + host_device_ctx->request_pool =
1288 + kmem_cache_create
1289 + (device_ctx->device.bus_id,
1290 + sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize,
1291 + 0,
1292 + SLAB_HWCACHE_ALIGN, NULL);
1293 +#else
1294 + host_device_ctx->request_pool =
1295 + kmem_cache_create
1296 + (device_ctx->device.bus_id,
1297 + sizeof(struct storvsc_cmd_request) + storvsc_drv_obj->RequestExtSize,
1298 + 0,
1299 + SLAB_HWCACHE_ALIGN, NULL, NULL);
1300 +#endif
1301 +
1302 + if (!host_device_ctx->request_pool)
1303 + {
1304 + scsi_host_put(host);
1305 + DPRINT_EXIT(STORVSC_DRV);
1306 +
1307 + return -ENOMEM;
1308 + }
1309 +
1310 + device_info.PortNumber = host->host_no;
1311 + // Call to the vsc driver to add the device
1312 + ret = storvsc_drv_obj->Base.OnDeviceAdd(device_obj, (void*)&device_info);
1313 + if (ret != 0)
1314 + {
1315 + DPRINT_ERR(STORVSC_DRV, "unable to add scsi vsc device");
1316 + kmem_cache_destroy(host_device_ctx->request_pool);
1317 + scsi_host_put(host);
1318 + DPRINT_EXIT(STORVSC_DRV);
1319 +
1320 + return -1;
1321 + }
1322 +
1323 + //host_device_ctx->port = device_info.PortNumber;
1324 + host_device_ctx->path = device_info.PathId;
1325 + host_device_ctx->target = device_info.TargetId;
1326 +
1327 + host->max_lun = STORVSC_MAX_LUNS_PER_TARGET; // max # of devices per target
1328 + host->max_id = STORVSC_MAX_TARGETS; // max # of targets per channel
1329 + host->max_channel = STORVSC_MAX_CHANNELS -1; // max # of channels
1330 +
1331 + // Register the HBA and start the scsi bus scan
1332 + ret = scsi_add_host(host, device);
1333 + if (ret != 0)
1334 + {
1335 + DPRINT_ERR(STORVSC_DRV, "unable to add scsi host device");
1336 +
1337 + storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
1338 +
1339 + kmem_cache_destroy(host_device_ctx->request_pool);
1340 + scsi_host_put(host);
1341 + DPRINT_EXIT(STORVSC_DRV);
1342 +
1343 + return -1;
1344 + }
1345 +
1346 + scsi_scan_host(host);
1347 +
1348 + DPRINT_EXIT(STORVSC_DRV);
1349 +
1350 + return ret;
1351 +}
1352 +
1353 +
1354 +/*++
1355 +
1356 +Name: storvsc_remove()
1357 +
1358 +Desc: Callback when our device is removed
1359 +
1360 +--*/
1361 +static int storvsc_remove(struct device *device)
1362 +{
1363 + int ret=0;
1364 +
1365 + struct driver_context *driver_ctx = driver_to_driver_context(device->driver);
1366 + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
1367 + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
1368 +
1369 + struct device_context *device_ctx = device_to_device_context(device);
1370 + DEVICE_OBJECT* device_obj = &device_ctx->device_obj;
1371 +
1372 + struct Scsi_Host *host = (struct Scsi_Host *)device->driver_data;
1373 + struct host_device_context *host_device_ctx=(struct host_device_context*)host->hostdata;
1374 +
1375 +
1376 + DPRINT_ENTER(STORVSC_DRV);
1377 +
1378 + if (!storvsc_drv_obj->Base.OnDeviceRemove)
1379 + {
1380 + DPRINT_EXIT(STORVSC_DRV);
1381 + return -1;
1382 + }
1383 +
1384 + // Call to the vsc driver to let it know that the device is being removed
1385 + ret = storvsc_drv_obj->Base.OnDeviceRemove(device_obj);
1386 + if (ret != 0)
1387 + {
1388 + // TODO:
1389 + DPRINT_ERR(STORVSC, "unable to remove vsc device (ret %d)", ret);
1390 + }
1391 +
1392 + if (host_device_ctx->request_pool)
1393 + {
1394 + kmem_cache_destroy(host_device_ctx->request_pool);
1395 + host_device_ctx->request_pool = NULL;
1396 + }
1397 +
1398 + DPRINT_INFO(STORVSC, "removing host adapter (%p)...", host);
1399 + scsi_remove_host(host);
1400 +
1401 + DPRINT_INFO(STORVSC, "releasing host adapter (%p)...", host);
1402 + scsi_host_put(host);
1403 +
1404 + DPRINT_EXIT(STORVSC_DRV);
1405 +
1406 + return ret;
1407 +}
1408 +
1409 +/*++
1410 +
1411 +Name: storvsc_commmand_completion()
1412 +
1413 +Desc: Command completion processing
1414 +
1415 +--*/
1416 +static void storvsc_commmand_completion(STORVSC_REQUEST* request)
1417 +{
1418 + struct storvsc_cmd_request *cmd_request = (struct storvsc_cmd_request*)request->Context;
1419 + struct scsi_cmnd *scmnd = cmd_request->cmd;
1420 + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
1421 + void (*scsi_done_fn)(struct scsi_cmnd *);
1422 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
1423 +#else
1424 + struct scsi_sense_hdr sense_hdr;
1425 +#endif
1426 +
1427 + ASSERT(request == &cmd_request->request);
1428 + ASSERT((unsigned long)scmnd->host_scribble == (unsigned long)cmd_request);
1429 + ASSERT(scmnd);
1430 + ASSERT(scmnd->scsi_done);
1431 +
1432 + DPRINT_ENTER(STORVSC_DRV);
1433 +
1434 + if (cmd_request->bounce_sgl_count)// using bounce buffer
1435 + {
1436 + //printk("copy_from_bounce_buffer\n");
1437 +
1438 + // FIXME: We can optimize on writes by just skipping this
1439 +#ifdef KERNEL_2_6_27
1440 + copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd));
1441 +#else
1442 + copy_from_bounce_buffer(scmnd->request_buffer, cmd_request->bounce_sgl, scmnd->use_sg);
1443 +#endif
1444 + destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count);
1445 + }
1446 +
1447 + scmnd->result = request->Status;
1448 +
1449 + if (scmnd->result)
1450 + {
1451 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
1452 + DPRINT_INFO(STORVSC_DRV, "scsi result nonzero - %d", scmnd->result);
1453 +#else
1454 + if (scsi_normalize_sense(scmnd->sense_buffer, request->SenseBufferSize, &sense_hdr))
1455 + {
1456 + scsi_print_sense_hdr("storvsc", &sense_hdr);
1457 + }
1458 +#endif
1459 + }
1460 +
1461 + ASSERT(request->BytesXfer <= request->DataBuffer.Length);
1462 +#ifdef KERNEL_2_6_27
1463 + scsi_set_resid(scmnd, request->DataBuffer.Length - request->BytesXfer);
1464 +#else
1465 + scmnd->resid = request->DataBuffer.Length - request->BytesXfer;
1466 +#endif
1467 +
1468 + scsi_done_fn = scmnd->scsi_done;
1469 +
1470 + scmnd->host_scribble = NULL;
1471 + scmnd->scsi_done = NULL;
1472 +
1473 + // !!DO NOT MODIFY the scmnd after this call
1474 + scsi_done_fn(scmnd);
1475 +
1476 + kmem_cache_free(host_device_ctx->request_pool, cmd_request);
1477 +
1478 + DPRINT_EXIT(STORVSC_DRV);
1479 +}
1480 +
1481 +static int do_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
1482 +{
1483 + int i=0;
1484 +
1485 + // No need to check
1486 + if (sg_count < 2)
1487 + return -1;
1488 +
1489 + // We have at least 2 sg entries
1490 + for ( i=0; i<sg_count; i++ )
1491 + {
1492 + if (i == 0) // make sure 1st one does not have hole
1493 + {
1494 + if (sgl[i].offset + sgl[i].length != PAGE_SIZE)
1495 + return i;
1496 + }
1497 + else if (i == sg_count - 1) // make sure last one does not have hole
1498 + {
1499 + if (sgl[i].offset != 0)
1500 + return i;
1501 + }
1502 + else // make sure no hole in the middle
1503 + {
1504 + if (sgl[i].length != PAGE_SIZE || sgl[i].offset != 0)
1505 + {
1506 + return i;
1507 + }
1508 + }
1509 + }
1510 + return -1;
1511 +}
1512 +
1513 +static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count, unsigned int len)
1514 +{
1515 + int i;
1516 + int num_pages=0;
1517 + struct scatterlist* bounce_sgl;
1518 + struct page *page_buf;
1519 +
1520 + num_pages = ALIGN_UP(len, PAGE_SIZE) >> PAGE_SHIFT;
1521 +
1522 + bounce_sgl = kzalloc(num_pages * sizeof(struct scatterlist), GFP_ATOMIC);
1523 + if (!bounce_sgl)
1524 + {
1525 + return NULL;
1526 + }
1527 +
1528 + for(i=0; i<num_pages; i++)
1529 + {
1530 + page_buf = alloc_page(GFP_ATOMIC);
1531 + if (!page_buf)
1532 + {
1533 + goto cleanup;
1534 + }
1535 +#ifdef KERNEL_2_6_27
1536 + sg_set_page(&bounce_sgl[i], page_buf, 0, 0);
1537 +#else
1538 + bounce_sgl[i].page = page_buf;
1539 + bounce_sgl[i].offset = 0;
1540 + bounce_sgl[i].length = 0;
1541 +#endif
1542 + }
1543 +
1544 + return bounce_sgl;
1545 +
1546 +cleanup:
1547 + destroy_bounce_buffer(bounce_sgl, num_pages);
1548 + return NULL;
1549 +}
1550 +
1551 +static void destroy_bounce_buffer(struct scatterlist *sgl, unsigned int sg_count)
1552 +{
1553 + int i;
1554 + struct page *page_buf;
1555 +
1556 + for (i=0; i<sg_count; i++)
1557 + {
1558 +#ifdef KERNEL_2_6_27
1559 + if ((page_buf = sg_page((&sgl[i]))) != NULL)
1560 +#else
1561 + if ((page_buf = sgl[i].page) != NULL)
1562 +#endif
1563 +
1564 + {
1565 + __free_page(page_buf);
1566 + }
1567 + }
1568 +
1569 + kfree(sgl);
1570 +}
1571 +
1572 +// Assume the bounce_sgl has enough room ie using the create_bounce_buffer()
1573 +static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count)
1574 +{
1575 + int i=0,j=0;
1576 + unsigned long src, dest;
1577 + unsigned int srclen, destlen, copylen;
1578 + unsigned int total_copied=0;
1579 + unsigned long bounce_addr=0;
1580 + unsigned long src_addr=0;
1581 + unsigned long flags;
1582 +
1583 + local_irq_save(flags);
1584 +
1585 + for (i=0; i<orig_sgl_count; i++)
1586 + {
1587 +#ifdef KERNEL_2_6_27
1588 + src_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset;
1589 +#else
1590 + src_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset;
1591 +#endif
1592 + src = src_addr;
1593 + srclen = orig_sgl[i].length;
1594 +
1595 + //if (PageHighMem(orig_sgl[i].page))
1596 + // printk("HighMem page detected - addr %p", (void*)src);
1597 +
1598 + ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE);
1599 +
1600 + if (j == 0)
1601 + {
1602 +#ifdef KERNEL_2_6_27
1603 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
1604 +#else
1605 + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
1606 +#endif
1607 + }
1608 +
1609 + while (srclen)
1610 + {
1611 + // assume bounce offset always == 0
1612 + dest = bounce_addr + bounce_sgl[j].length;
1613 + destlen = PAGE_SIZE - bounce_sgl[j].length;
1614 +
1615 + copylen = MIN(srclen, destlen);
1616 + memcpy((void*)dest, (void*)src, copylen);
1617 +
1618 + total_copied += copylen;
1619 + bounce_sgl[j].length += copylen;
1620 + srclen -= copylen;
1621 + src += copylen;
1622 +
1623 + if (bounce_sgl[j].length == PAGE_SIZE) // full..move to next entry
1624 + {
1625 + kunmap_atomic((void*)bounce_addr, KM_IRQ0);
1626 + j++;
1627 +
1628 + // if we need to use another bounce buffer
1629 + if (srclen || i != orig_sgl_count -1)
1630 + {
1631 +#ifdef KERNEL_2_6_27
1632 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
1633 +#else
1634 + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
1635 +#endif
1636 + }
1637 + }
1638 + else if (srclen == 0 && i == orig_sgl_count -1) // // unmap the last bounce that is < PAGE_SIZE
1639 + {
1640 + kunmap_atomic((void*)bounce_addr, KM_IRQ0);
1641 + }
1642 + }
1643 +
1644 + kunmap_atomic((void*)(src_addr - orig_sgl[i].offset), KM_IRQ0);
1645 + }
1646 +
1647 + local_irq_restore(flags);
1648 +
1649 + return total_copied;
1650 +}
1651 +
1652 +// Assume the original sgl has enough room
1653 +static unsigned int copy_from_bounce_buffer(struct scatterlist *orig_sgl, struct scatterlist *bounce_sgl, unsigned int orig_sgl_count)
1654 +{
1655 + int i=0,j=0;
1656 + unsigned long src, dest;
1657 + unsigned int srclen, destlen, copylen;
1658 + unsigned int total_copied=0;
1659 + unsigned long bounce_addr=0;
1660 + unsigned long dest_addr=0;
1661 + unsigned long flags;
1662 +
1663 + local_irq_save(flags);
1664 +
1665 + for (i=0; i<orig_sgl_count; i++)
1666 + {
1667 +#ifdef KERNEL_2_6_27
1668 + dest_addr = (unsigned long)kmap_atomic(sg_page((&orig_sgl[i])), KM_IRQ0) + orig_sgl[i].offset;
1669 +#else
1670 + dest_addr = (unsigned long)kmap_atomic(orig_sgl[i].page, KM_IRQ0) + orig_sgl[i].offset;
1671 +#endif
1672 + dest = dest_addr;
1673 + destlen = orig_sgl[i].length;
1674 + ASSERT(orig_sgl[i].offset + orig_sgl[i].length <= PAGE_SIZE);
1675 +
1676 + if (j == 0)
1677 + {
1678 +#ifdef KERNEL_2_6_27
1679 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
1680 +#else
1681 + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
1682 +#endif
1683 + }
1684 +
1685 + while (destlen)
1686 + {
1687 + src = bounce_addr + bounce_sgl[j].offset;
1688 + srclen = bounce_sgl[j].length - bounce_sgl[j].offset;
1689 +
1690 + copylen = MIN(srclen, destlen);
1691 + memcpy((void*)dest, (void*)src, copylen);
1692 +
1693 + total_copied += copylen;
1694 + bounce_sgl[j].offset += copylen;
1695 + destlen -= copylen;
1696 + dest += copylen;
1697 +
1698 + if (bounce_sgl[j].offset == bounce_sgl[j].length) // full
1699 + {
1700 + kunmap_atomic((void*)bounce_addr, KM_IRQ0);
1701 + j++;
1702 +
1703 + // if we need to use another bounce buffer
1704 + if (destlen || i != orig_sgl_count -1)
1705 + {
1706 +#ifdef KERNEL_2_6_27
1707 + bounce_addr = (unsigned long)kmap_atomic(sg_page((&bounce_sgl[j])), KM_IRQ0);
1708 +#else
1709 + bounce_addr = (unsigned long)kmap_atomic(bounce_sgl[j].page, KM_IRQ0);
1710 +#endif
1711 + }
1712 + }
1713 + else if (destlen == 0 && i == orig_sgl_count -1) // unmap the last bounce that is < PAGE_SIZE
1714 + {
1715 + kunmap_atomic((void*)bounce_addr, KM_IRQ0);
1716 + }
1717 + }
1718 +
1719 + kunmap_atomic((void*)(dest_addr - orig_sgl[i].offset), KM_IRQ0);
1720 + }
1721 +
1722 + local_irq_restore(flags);
1723 +
1724 + return total_copied;
1725 +}
1726 +
1727 +
1728 +/*++
1729 +
1730 +Name: storvsc_queuecommand()
1731 +
1732 +Desc: Initiate command processing
1733 +
1734 +--*/
1735 +static int storvsc_queuecommand(struct scsi_cmnd *scmnd, void (*done)(struct scsi_cmnd *))
1736 +{
1737 + int ret=0;
1738 + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
1739 + struct device_context *device_ctx=host_device_ctx->device_ctx;
1740 + struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver);
1741 + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
1742 + STORVSC_DRIVER_OBJECT* storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
1743 +
1744 + STORVSC_REQUEST *request;
1745 + struct storvsc_cmd_request *cmd_request;
1746 + unsigned int request_size=0;
1747 + int i;
1748 + struct scatterlist *sgl;
1749 +
1750 + DPRINT_ENTER(STORVSC_DRV);
1751 +
1752 +#ifdef KERNEL_2_6_27
1753 + DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d",
1754 + scmnd,
1755 + scmnd->sc_data_direction,
1756 + scsi_sg_count(scmnd),
1757 + scsi_sglist(scmnd),
1758 + scsi_bufflen(scmnd),
1759 + scmnd->device->queue_depth,
1760 + scmnd->device->tagged_supported);
1761 +#else
1762 + DPRINT_DBG(STORVSC_DRV, "scmnd %p dir %d, use_sg %d buf %p len %d queue depth %d tagged %d",
1763 + scmnd,
1764 + scmnd->sc_data_direction,
1765 + scmnd->use_sg,
1766 + scmnd->request_buffer,
1767 + scmnd->request_bufflen,
1768 + scmnd->device->queue_depth,
1769 + scmnd->device->tagged_supported);
1770 +#endif
1771 +
1772 + // If retrying, no need to prep the cmd
1773 + if (scmnd->host_scribble)
1774 + {
1775 + ASSERT(scmnd->scsi_done != NULL);
1776 +
1777 + cmd_request = (struct storvsc_cmd_request* )scmnd->host_scribble;
1778 + DPRINT_INFO(STORVSC_DRV, "retrying scmnd %p cmd_request %p", scmnd, cmd_request);
1779 +
1780 + goto retry_request;
1781 + }
1782 +
1783 + ASSERT(scmnd->scsi_done == NULL);
1784 + ASSERT(scmnd->host_scribble == NULL);
1785 +
1786 + scmnd->scsi_done = done;
1787 +
1788 + request_size = sizeof(struct storvsc_cmd_request);
1789 +
1790 + cmd_request = kmem_cache_alloc(host_device_ctx->request_pool, GFP_ATOMIC);
1791 + if (!cmd_request)
1792 + {
1793 + DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - unable to allocate storvsc_cmd_request...marking queue busy", scmnd);
1794 +
1795 + scmnd->scsi_done = NULL;
1796 + return SCSI_MLQUEUE_DEVICE_BUSY;
1797 + }
1798 +
1799 + // Setup the cmd request
1800 + cmd_request->bounce_sgl_count = 0;
1801 + cmd_request->bounce_sgl = NULL;
1802 + cmd_request->cmd = scmnd;
1803 +
1804 + scmnd->host_scribble = (unsigned char*)cmd_request;
1805 +
1806 + request = &cmd_request->request;
1807 +
1808 + request->Extension = (void*)((unsigned long)cmd_request + request_size);
1809 + DPRINT_DBG(STORVSC_DRV, "req %p size %d ext %d", request, request_size, storvsc_drv_obj->RequestExtSize);
1810 +
1811 + // Build the SRB
1812 + switch(scmnd->sc_data_direction)
1813 + {
1814 + case DMA_TO_DEVICE:
1815 + request->Type = WRITE_TYPE;
1816 + break;
1817 + case DMA_FROM_DEVICE:
1818 + request->Type = READ_TYPE;
1819 + break;
1820 + default:
1821 + request->Type = UNKNOWN_TYPE;
1822 + break;
1823 + }
1824 +
1825 + request->OnIOCompletion = storvsc_commmand_completion;
1826 + request->Context = cmd_request;//scmnd;
1827 +
1828 + //request->PortId = scmnd->device->channel;
1829 + request->Host = host_device_ctx->port;
1830 + request->Bus = scmnd->device->channel;
1831 + request->TargetId = scmnd->device->id;
1832 + request->LunId = scmnd->device->lun;
1833 +
1834 + ASSERT(scmnd->cmd_len <= 16);
1835 + request->CdbLen = scmnd->cmd_len;
1836 + request->Cdb = scmnd->cmnd;
1837 +
1838 + request->SenseBuffer = scmnd->sense_buffer;
1839 + request->SenseBufferSize = SCSI_SENSE_BUFFERSIZE;
1840 +
1841 +
1842 +#ifdef KERNEL_2_6_27
1843 + request->DataBuffer.Length = scsi_bufflen(scmnd);
1844 + if (scsi_sg_count(scmnd))
1845 +#else
1846 + request->DataBuffer.Length = scmnd->request_bufflen;
1847 + if (scmnd->use_sg)
1848 +#endif
1849 + {
1850 +#ifdef KERNEL_2_6_27
1851 + sgl = (struct scatterlist*)scsi_sglist(scmnd);
1852 +#else
1853 + sgl = (struct scatterlist*)(scmnd->request_buffer);
1854 +#endif
1855 +
1856 + // check if we need to bounce the sgl
1857 +#ifdef KERNEL_2_6_27
1858 + if (do_bounce_buffer(sgl, scsi_sg_count(scmnd)) != -1)
1859 +#else
1860 + if (do_bounce_buffer(sgl, scmnd->use_sg) != -1)
1861 +#endif
1862 + {
1863 + DPRINT_INFO(STORVSC_DRV, "need to bounce buffer for this scmnd %p", scmnd);
1864 +#ifdef KERNEL_2_6_27
1865 + cmd_request->bounce_sgl = create_bounce_buffer(sgl, scsi_sg_count(scmnd), scsi_bufflen(scmnd));
1866 +#else
1867 + cmd_request->bounce_sgl = create_bounce_buffer(
1868 + sgl,
1869 + scmnd->use_sg, scmnd->request_bufflen);
1870 +#endif
1871 + if (!cmd_request->bounce_sgl)
1872 + {
1873 + DPRINT_ERR(STORVSC_DRV, "unable to create bounce buffer for this scmnd %p", scmnd);
1874 +
1875 + scmnd->scsi_done = NULL;
1876 + scmnd->host_scribble = NULL;
1877 + kmem_cache_free(host_device_ctx->request_pool, cmd_request);
1878 +
1879 + return SCSI_MLQUEUE_HOST_BUSY;
1880 + }
1881 +
1882 +#ifdef KERNEL_2_6_27
1883 + cmd_request->bounce_sgl_count = ALIGN_UP(scsi_bufflen(scmnd), PAGE_SIZE) >> PAGE_SHIFT;
1884 +#else
1885 + cmd_request->bounce_sgl_count = ALIGN_UP(scmnd->request_bufflen, PAGE_SIZE) >> PAGE_SHIFT;
1886 +#endif
1887 +
1888 + //printk("bouncing buffer allocated %p original buffer %p\n", bounce_sgl, sgl);
1889 + //printk("copy_to_bounce_buffer\n");
1890 + // FIXME: We can optimize on reads by just skipping this
1891 +#ifdef KERNEL_2_6_27
1892 + copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scsi_sg_count(scmnd));
1893 +#else
1894 + copy_to_bounce_buffer(sgl, cmd_request->bounce_sgl, scmnd->use_sg);
1895 +#endif
1896 +
1897 + sgl = cmd_request->bounce_sgl;
1898 + }
1899 +
1900 + request->DataBuffer.Offset = sgl[0].offset;
1901 +
1902 +#ifdef KERNEL_2_6_27
1903 + for (i = 0; i < scsi_sg_count(scmnd); i++ )
1904 +#else
1905 + for (i = 0; i < scmnd->use_sg; i++ )
1906 +#endif
1907 + {
1908 + DPRINT_DBG(STORVSC_DRV, "sgl[%d] len %d offset %d \n", i, sgl[i].length, sgl[i].offset);
1909 +#ifdef KERNEL_2_6_27
1910 + request->DataBuffer.PfnArray[i] = page_to_pfn(sg_page((&sgl[i])));
1911 +#else
1912 + request->DataBuffer.PfnArray[i] = page_to_pfn(sgl[i].page);
1913 +#endif
1914 + }
1915 + }
1916 +
1917 +#ifdef KERNEL_2_6_27
1918 + else if (scsi_sglist(scmnd))
1919 + {
1920 + ASSERT(scsi_bufflen(scmnd) <= PAGE_SIZE);
1921 + request->DataBuffer.Offset = virt_to_phys(scsi_sglist(scmnd)) & (PAGE_SIZE-1);
1922 + request->DataBuffer.PfnArray[0] = virt_to_phys(scsi_sglist(scmnd)) >> PAGE_SHIFT;
1923 + }
1924 + else
1925 + {
1926 + ASSERT(scsi_bufflen(scmnd) == 0);
1927 + }
1928 +#else
1929 + else if (scmnd->request_buffer)
1930 + {
1931 + ASSERT(scmnd->request_bufflen <= PAGE_SIZE);
1932 + request->DataBuffer.Offset = virt_to_phys(scmnd->request_buffer) & (PAGE_SIZE-1);
1933 + request->DataBuffer.PfnArray[0] = virt_to_phys(scmnd->request_buffer) >> PAGE_SHIFT;
1934 + }
1935 + else
1936 + {
1937 + ASSERT(scmnd->request_bufflen == 0);
1938 + }
1939 +#endif
1940 +
1941 +retry_request:
1942 +
1943 + // Invokes the vsc to start an IO
1944 + ret = storvsc_drv_obj->OnIORequest(&device_ctx->device_obj, &cmd_request->request);
1945 + if (ret == -1) // no more space
1946 + {
1947 + DPRINT_ERR(STORVSC_DRV, "scmnd (%p) - queue FULL...marking queue busy", scmnd);
1948 +
1949 + if (cmd_request->bounce_sgl_count)
1950 + {
1951 + // FIXME: We can optimize on writes by just skipping this
1952 +#ifdef KERNEL_2_6_27
1953 + copy_from_bounce_buffer(scsi_sglist(scmnd), cmd_request->bounce_sgl, scsi_sg_count(scmnd));
1954 +#else
1955 + copy_from_bounce_buffer(
1956 + scmnd->request_buffer,
1957 + cmd_request->bounce_sgl,
1958 + scmnd->use_sg);
1959 +#endif
1960 + destroy_bounce_buffer(cmd_request->bounce_sgl, cmd_request->bounce_sgl_count);
1961 + }
1962 +
1963 + kmem_cache_free(host_device_ctx->request_pool, cmd_request);
1964 +
1965 + scmnd->scsi_done = NULL;
1966 + scmnd->host_scribble = NULL;
1967 +
1968 + ret = SCSI_MLQUEUE_DEVICE_BUSY;
1969 + }
1970 +
1971 + DPRINT_EXIT(STORVSC_DRV);
1972 +
1973 + return ret;
1974 +}
1975 +
1976 +#ifdef KERNEL_2_6_27
1977 +static int storvsc_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, struct bio_vec *bvec)
1978 +{
1979 + return bvec->bv_len; //checking done by caller.
1980 +}
1981 +#else
1982 +static int storvsc_merge_bvec(struct request_queue *q, struct bio *bio, struct bio_vec *bvec)
1983 +{
1984 + // Check if we are adding a new bvec
1985 + if (bio->bi_vcnt > 0)
1986 + {
1987 + //printk("storvsc_merge_bvec() - cnt %u offset %u len %u\n", bio->bi_vcnt, bvec->bv_offset, bvec->bv_len);
1988 +
1989 + struct bio_vec *prev = &bio->bi_io_vec[bio->bi_vcnt - 1];
1990 + if (bvec == prev)
1991 + return bvec->bv_len; // success
1992 +
1993 + // Adding new bvec. Make sure the prev one is a complete page
1994 + if (prev->bv_len == PAGE_SIZE && prev->bv_offset == 0)
1995 + {
1996 + return bvec->bv_len; // success
1997 + }
1998 + else
1999 + {
2000 + // Dont reject if the new bvec starts off from the prev one since
2001 + // they will be merge into 1 bvec or blk_rq_map_sg() will merge them into 1 sg element
2002 + if ((bvec->bv_page == prev->bv_page) &&
2003 + (bvec->bv_offset == prev->bv_offset + prev->bv_len))
2004 + {
2005 + return bvec->bv_len; // success
2006 + }
2007 + else
2008 + {
2009 + DPRINT_INFO(STORVSC_DRV, "detected holes in bio request (%p) - cnt %u offset %u len %u", bio, bio->bi_vcnt, bvec->bv_offset, bvec->bv_len);
2010 + return 0; // dont add the bvec to this bio since we dont allow holes in the middle of a multi-pages bio
2011 + }
2012 + }
2013 + }
2014 +
2015 + return bvec->bv_len; // success
2016 +
2017 +}
2018 +
2019 +#endif
2020 +
2021 +/*++
2022 +
2023 +Name: storvsc_device_configure()
2024 +
2025 +Desc: Configure the specified scsi device
2026 +
2027 +--*/
2028 +static int storvsc_device_alloc(struct scsi_device *sdevice)
2029 +{
2030 +#ifdef KERNEL_2_6_5
2031 +#else
2032 + DPRINT_DBG(STORVSC_DRV, "sdev (%p) - setting device flag to %d", sdevice, BLIST_SPARSELUN);
2033 + // This enables luns to be located sparsely. Otherwise, we may not discovered them.
2034 + sdevice->sdev_bflags |= BLIST_SPARSELUN | BLIST_LARGELUN;
2035 +#endif
2036 + return 0;
2037 +}
2038 +
2039 +static int storvsc_device_configure(struct scsi_device *sdevice)
2040 +{
2041 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - curr queue depth %d", sdevice, sdevice->queue_depth);
2042 +
2043 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting queue depth to %d", sdevice, STORVSC_MAX_IO_REQUESTS);
2044 + scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG, STORVSC_MAX_IO_REQUESTS);
2045 +
2046 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - setting max segment size to %d", sdevice, PAGE_SIZE);
2047 + blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
2048 +
2049 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) - adding merge bio vec routine", sdevice);
2050 + blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
2051 +
2052 + blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
2053 + //sdevice->timeout = (2000 * HZ);//(75 * HZ);
2054 +
2055 + return 0;
2056 +}
2057 +
2058 +/*++
2059 +
2060 +Name: storvsc_host_reset_handler()
2061 +
2062 +Desc: Reset the scsi HBA
2063 +
2064 +--*/
2065 +static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
2066 +{
2067 + int ret=SUCCESS;
2068 + struct host_device_context *host_device_ctx = (struct host_device_context*)scmnd->device->host->hostdata;
2069 + struct device_context *device_ctx = host_device_ctx->device_ctx;
2070 + struct driver_context *driver_ctx = driver_to_driver_context(device_ctx->device.driver);
2071 + struct storvsc_driver_context *storvsc_drv_ctx = (struct storvsc_driver_context*)driver_ctx;
2072 +
2073 + STORVSC_DRIVER_OBJECT *storvsc_drv_obj = &storvsc_drv_ctx->drv_obj;
2074 +
2075 + DPRINT_ENTER(STORVSC_DRV);
2076 +
2077 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host resetting...", scmnd->device, &device_ctx->device_obj);
2078 +
2079 + // Invokes the vsc to reset the host/bus
2080 + ASSERT(storvsc_drv_obj->OnHostReset);
2081 + ret = storvsc_drv_obj->OnHostReset(&device_ctx->device_obj);
2082 + if (ret != 0)
2083 + {
2084 + DPRINT_EXIT(STORVSC_DRV);
2085 + return ret;
2086 + }
2087 +
2088 + DPRINT_INFO(STORVSC_DRV, "sdev (%p) dev obj (%p) - host reseted", scmnd->device, &device_ctx->device_obj);
2089 +
2090 + DPRINT_EXIT(STORVSC_DRV);
2091 +
2092 + return ret;
2093 +}
2094 +
2095 +/*++
2096 +
2097 +Name: storvsc_host_rescan
2098 +
2099 +Desc: Rescan the scsi HBA
2100 +
2101 +--*/
2102 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
2103 +#else
2104 +
2105 +#ifdef KERNEL_2_6_27
2106 +static void storvsc_host_rescan_callback(struct work_struct *work)
2107 +{
2108 + DEVICE_OBJECT* device_obj =
2109 + &((struct host_device_context*)work)->device_ctx->device_obj;
2110 +#else
2111 +static void storvsc_host_rescan_callback(void* context)
2112 +{
2113 +
2114 + DEVICE_OBJECT* device_obj = (DEVICE_OBJECT*)context;
2115 +#endif
2116 + struct device_context* device_ctx = to_device_context(device_obj);
2117 + struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data;
2118 + struct scsi_device *sdev;
2119 + struct host_device_context *host_device_ctx;
2120 + struct scsi_device **sdevs_remove_list;
2121 + unsigned int sdevs_count=0;
2122 + unsigned int found;
2123 + unsigned int i;
2124 + unsigned int lun_count=0;
2125 + unsigned int *lun_list;
2126 +
2127 + DPRINT_ENTER(STORVSC_DRV);
2128 +
2129 + host_device_ctx = (struct host_device_context*)host->hostdata;
2130 + lun_list = kzalloc(sizeof(unsigned int)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC);
2131 + if (!lun_list)
2132 + {
2133 + DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list");
2134 + return;
2135 + }
2136 +
2137 + sdevs_remove_list = kzalloc(sizeof(void*)*STORVSC_MAX_LUNS_PER_TARGET, GFP_ATOMIC);
2138 + if (!sdevs_remove_list)
2139 + {
2140 + kfree(lun_list);
2141 + DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list");
2142 + return;
2143 + }
2144 +
2145 + DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...", device_obj, host_device_ctx->target, host_device_ctx->path);
2146 +
2147 + // Rescan for new device
2148 + scsi_scan_target(&host->shost_gendev, host_device_ctx->path, host_device_ctx->target, SCAN_WILD_CARD, 1);
2149 +
2150 + DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device...");
2151 +
2152 + // Use the 1st device to send the report luns cmd
2153 + shost_for_each_device(sdev, host)
2154 + {
2155 + lun_count=STORVSC_MAX_LUNS_PER_TARGET;
2156 + storvsc_report_luns(sdev, lun_list, &lun_count);
2157 +
2158 + DPRINT_INFO(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, lun_count);
2159 + DPRINT_INFO(STORVSC_DRV, "existing luns on scsi device (%p) host (%d)", sdev, host->host_no);
2160 +
2161 + scsi_device_put(sdev);
2162 + break;
2163 + }
2164 +
2165 + for (i=0; i<lun_count; i++)
2166 + {
2167 + DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]);
2168 + }
2169 +
2170 + // Rescan for devices that may have been removed.
2171 + // We do not have to worry that new devices may have been added since
2172 + // this callback is serialized by the workqueue ie add/remove are done here.
2173 + shost_for_each_device(sdev, host)
2174 + {
2175 + // See if this device is still here
2176 + found = 0;
2177 + for (i=0; i<lun_count; i++)
2178 + {
2179 + if (sdev->lun == lun_list[i])
2180 + {
2181 + found = 1;
2182 + break;
2183 + }
2184 + }
2185 + if (!found)
2186 + {
2187 + DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists", sdev->lun);
2188 + sdevs_remove_list[sdevs_count++] = sdev;
2189 + }
2190 + }
2191 +
2192 + // Now remove the devices
2193 + for (i=0; i< sdevs_count; i++)
2194 + {
2195 + DPRINT_INFO(STORVSC_DRV, "removing scsi device (%p) lun (%u)...",
2196 + sdevs_remove_list[i], sdevs_remove_list[i]->lun);
2197 +
2198 + // make sure it is not removed from underneath us
2199 + if (!scsi_device_get(sdevs_remove_list[i]))
2200 + {
2201 + scsi_remove_device(sdevs_remove_list[i]);
2202 + scsi_device_put(sdevs_remove_list[i]);
2203 + }
2204 + }
2205 +
2206 + DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) target (%u) bus (%u)", device_obj, host_device_ctx->target, host_device_ctx->path);
2207 +
2208 + kfree(lun_list);
2209 + kfree(sdevs_remove_list);
2210 +
2211 + DPRINT_EXIT(STORVSC_DRV);
2212 +}
2213 +
2214 +static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[], unsigned int *lun_count)
2215 +{
2216 + int i,j;
2217 + unsigned int lun=0;
2218 + unsigned int num_luns;
2219 + int result;
2220 + unsigned char *data;
2221 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
2222 +#else
2223 + struct scsi_sense_hdr sshdr;
2224 +#endif
2225 + unsigned char cmd[16]={0};
2226 + unsigned int report_len = 8*(STORVSC_MAX_LUNS_PER_TARGET+1); // Add 1 to cover the report_lun header
2227 + unsigned long long *report_luns;
2228 + const unsigned int in_lun_count = *lun_count;
2229 +
2230 + *lun_count = 0;
2231 +
2232 + report_luns = kzalloc(report_len, GFP_ATOMIC);
2233 + if (!report_luns)
2234 + {
2235 + return -ENOMEM;
2236 + }
2237 +
2238 + cmd[0] = REPORT_LUNS;
2239 +
2240 + // cmd length
2241 + *(unsigned int*)&cmd[6] = cpu_to_be32(report_len);
2242 +
2243 + result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, (unsigned char*)report_luns, report_len, &sshdr, 30*HZ, 3);
2244 + if (result != 0)
2245 + {
2246 + kfree(report_luns);
2247 + return -EBUSY;
2248 + }
2249 +
2250 + // get the length from the first four bytes
2251 + report_len = be32_to_cpu(*(unsigned int*)&report_luns[0]);
2252 +
2253 + num_luns = (report_len / sizeof(unsigned long long));
2254 + if (num_luns > in_lun_count)
2255 + {
2256 + kfree(report_luns);
2257 + return -EINVAL;
2258 + }
2259 +
2260 + *lun_count = num_luns;
2261 +
2262 + DPRINT_DBG(STORVSC_DRV, "report luns on scsi device (%p) found %u luns ", sdev, num_luns);
2263 +
2264 + // lun id starts at 1
2265 + for (i=1; i< num_luns+1; i++)
2266 + {
2267 + lun = 0;
2268 + data = (unsigned char*)&report_luns[i];
2269 + for (j = 0; j < sizeof(lun); j += 2)
2270 + {
2271 + lun = lun | (((data[j] << 8) | data[j + 1]) << (j * 8));
2272 + }
2273 +
2274 + luns[i-1] = lun;
2275 + }
2276 +
2277 + kfree(report_luns);
2278 + return 0;
2279 +}
2280 +#endif // KERNEL_2_6_9
2281 +
2282 +static void storvsc_host_rescan(DEVICE_OBJECT* device_obj)
2283 +{
2284 + struct device_context* device_ctx = to_device_context(device_obj);
2285 + struct Scsi_Host *host = (struct Scsi_Host *)device_ctx->device.driver_data;
2286 + struct host_device_context *host_device_ctx;
2287 +
2288 + DPRINT_ENTER(STORVSC_DRV);
2289 +#if defined(KERNEL_2_6_5) || defined(KERNEL_2_6_9)
2290 + DPRINT_ERR(STORVSC_DRV, "rescan not supported on 2.6.9 kernels!! You will need to reboot if you have added or removed the scsi lun device");
2291 +#else
2292 +
2293 + host_device_ctx = (struct host_device_context*)host->hostdata;
2294 +
2295 + DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) target (%u) bus (%u)...", device_obj, host_device_ctx->target, host_device_ctx->path);
2296 +
2297 + // We need to queue this since the scanning may block and the caller may be in an intr context
2298 + //scsi_queue_work(host, &host_device_ctx->host_rescan_work);
2299 + schedule_work(&host_device_ctx->host_rescan_work);
2300 +#endif // KERNEL_2_6_9
2301 + DPRINT_EXIT(STORVSC_DRV);
2302 +}
2303 +
2304 +static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev, sector_t capacity, int *info)
2305 +{
2306 + sector_t total_sectors = capacity;
2307 + sector_t cylinder_times_heads=0;
2308 + sector_t temp=0;
2309 +
2310 + int sectors_per_track=0;
2311 + int heads=0;
2312 + int cylinders=0;
2313 + int rem=0;
2314 +
2315 + if (total_sectors > (65535 * 16 * 255)) {
2316 + total_sectors = (65535 * 16 * 255);
2317 + }
2318 +
2319 + if (total_sectors >= (65535 * 16 * 63)) {
2320 + sectors_per_track = 255;
2321 + heads = 16;
2322 +
2323 + cylinder_times_heads = total_sectors;
2324 + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
2325 + }
2326 + else
2327 + {
2328 + sectors_per_track = 17;
2329 +
2330 + cylinder_times_heads = total_sectors;
2331 + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
2332 +
2333 + temp = cylinder_times_heads + 1023;
2334 + rem = sector_div(temp, 1024); // sector_div stores the quotient in temp
2335 +
2336 + heads = temp;
2337 +
2338 + if (heads < 4) {
2339 + heads = 4;
2340 + }
2341 +
2342 + if (cylinder_times_heads >= (heads * 1024) || (heads > 16)) {
2343 + sectors_per_track = 31;
2344 + heads = 16;
2345 +
2346 + cylinder_times_heads = total_sectors;
2347 + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
2348 + }
2349 +
2350 + if (cylinder_times_heads >= (heads * 1024)) {
2351 + sectors_per_track = 63;
2352 + heads = 16;
2353 +
2354 + cylinder_times_heads = total_sectors;
2355 + rem = sector_div(cylinder_times_heads, sectors_per_track); // sector_div stores the quotient in cylinder_times_heads
2356 + }
2357 + }
2358 +
2359 + temp = cylinder_times_heads;
2360 + rem = sector_div(temp, heads); // sector_div stores the quotient in temp
2361 + cylinders = temp;
2362 +
2363 + info[0] = heads;
2364 + info[1] = sectors_per_track;
2365 + info[2] = cylinders;
2366 +
2367 + DPRINT_INFO(STORVSC_DRV, "CHS (%d, %d, %d)", cylinders, heads, sectors_per_track);
2368 +
2369 + return 0;
2370 +}
2371 +
2372 +MODULE_LICENSE("GPL");
2373 +
2374 +static int __init storvsc_init(void)
2375 +{
2376 + int ret;
2377 +
2378 + DPRINT_ENTER(STORVSC_DRV);
2379 +
2380 + DPRINT_INFO(STORVSC_DRV, "Storvsc initializing....");
2381 +
2382 + ret = storvsc_drv_init(StorVscInitialize);
2383 +
2384 + DPRINT_EXIT(STORVSC_DRV);
2385 +
2386 + return ret;
2387 +}
2388 +
2389 +static void __exit storvsc_exit(void)
2390 +{
2391 + DPRINT_ENTER(STORVSC_DRV);
2392 +
2393 + storvsc_drv_exit();
2394 +
2395 + DPRINT_ENTER(STORVSC_DRV);
2396 +}
2397 +
2398 +module_param(storvsc_ringbuffer_size, int, S_IRUGO);
2399 +
2400 +module_init(storvsc_init);
2401 +module_exit(storvsc_exit);
2402 +
2403 +// eof
Timo's tree of IPFire 2.x