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[mirror_edk2.git] / MdeModulePkg / Universal / FaultTolerantWriteDxe / FaultTolerantWriteSmmDxe.c
1 /** @file
2
3 Implement the Fault Tolerant Write (FTW) protocol based on SMM FTW
4 module.
5
6 Copyright (c) 2011, Intel Corporation. All rights reserved. <BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include "FaultTolerantWriteSmmDxe.h"
18
19 EFI_HANDLE mHandle = NULL;
20 EFI_SMM_COMMUNICATION_PROTOCOL *mSmmCommunication = NULL;
21 UINTN mPrivateDataSize = 0;
22
23 EFI_FAULT_TOLERANT_WRITE_PROTOCOL mFaultTolerantWriteDriver = {
24 FtwGetMaxBlockSize,
25 FtwAllocate,
26 FtwWrite,
27 FtwRestart,
28 FtwAbort,
29 FtwGetLastWrite
30 };
31
32 /**
33 Initialize the communicate buffer using DataSize and Function number.
34
35 @param[out] CommunicateBuffer The communicate buffer. Caller should free it after use.
36 @param[out] DataPtr Points to the data in the communicate buffer. Caller should not free it.
37 @param[in] DataSize The payload size.
38 @param[in] Function The function number used to initialize the communicate header.
39
40 **/
41 VOID
42 InitCommunicateBuffer (
43 OUT VOID **CommunicateBuffer,
44 OUT VOID **DataPtr,
45 IN UINTN DataSize,
46 IN UINTN Function
47 )
48 {
49 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
50 SMM_FTW_COMMUNICATE_FUNCTION_HEADER *SmmFtwFunctionHeader;
51
52 //
53 // The whole buffer size: SMM_COMMUNICATE_HEADER_SIZE + SMM_FTW_COMMUNICATE_HEADER_SIZE + DataSize.
54 //
55 SmmCommunicateHeader = AllocateZeroPool (DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_FTW_COMMUNICATE_HEADER_SIZE);
56 ASSERT (SmmCommunicateHeader != NULL);
57
58 //
59 // Prepare data buffer.
60 //
61 CopyGuid (&SmmCommunicateHeader->HeaderGuid, &gEfiSmmFaultTolerantWriteProtocolGuid);
62 SmmCommunicateHeader->MessageLength = DataSize + SMM_FTW_COMMUNICATE_HEADER_SIZE;
63
64 SmmFtwFunctionHeader = (SMM_FTW_COMMUNICATE_FUNCTION_HEADER *) SmmCommunicateHeader->Data;
65 SmmFtwFunctionHeader->Function = Function;
66
67 *CommunicateBuffer = SmmCommunicateHeader;
68 if (DataPtr != NULL) {
69 *DataPtr = SmmFtwFunctionHeader->Data;
70 }
71 }
72
73
74 /**
75 Send the data in communicate buffer to SMI handler and get response.
76
77 @param[in, out] SmmCommunicateHeader The communicate buffer.
78 @param[in] DataSize The payload size.
79
80 **/
81 EFI_STATUS
82 SendCommunicateBuffer (
83 IN OUT EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader,
84 IN UINTN DataSize
85 )
86 {
87 EFI_STATUS Status;
88 UINTN CommSize;
89 SMM_FTW_COMMUNICATE_FUNCTION_HEADER *SmmFtwFunctionHeader;
90
91 CommSize = DataSize + SMM_COMMUNICATE_HEADER_SIZE + SMM_FTW_COMMUNICATE_HEADER_SIZE;
92 Status = mSmmCommunication->Communicate (mSmmCommunication, SmmCommunicateHeader, &CommSize);
93 ASSERT_EFI_ERROR (Status);
94
95 SmmFtwFunctionHeader = (SMM_FTW_COMMUNICATE_FUNCTION_HEADER *) SmmCommunicateHeader->Data;
96 return SmmFtwFunctionHeader->ReturnStatus;
97 }
98
99
100 /**
101 Get the FvbBaseAddress and FvbAttributes from the FVB handle FvbHandle.
102
103 @param[in] FvbHandle The handle of FVB protocol that provides services.
104 @param[out] FvbBaseAddress The base address of the FVB attached with FvbHandle.
105 @param[out] FvbAttributes The attributes of the FVB attached with FvbHandle.
106
107 @retval EFI_SUCCESS The function completed successfully.
108 @retval Others The function could not complete successfully.
109
110 **/
111 EFI_STATUS
112 ConvertFvbHandle (
113 IN EFI_HANDLE FvbHandle,
114 OUT EFI_PHYSICAL_ADDRESS *FvbBaseAddress,
115 OUT EFI_FVB_ATTRIBUTES_2 *FvbAttributes
116 )
117 {
118 EFI_STATUS Status;
119 EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
120
121 Status = gBS->HandleProtocol (FvbHandle, &gEfiFirmwareVolumeBlockProtocolGuid, (VOID **) &Fvb);
122 if (EFI_ERROR (Status)) {
123 return Status;
124 }
125
126 Status = Fvb->GetPhysicalAddress (Fvb, FvbBaseAddress);
127 if (EFI_ERROR (Status)) {
128 return Status;
129 }
130
131 Status = Fvb->GetAttributes (Fvb, FvbAttributes);
132 return Status;
133 }
134
135
136 /**
137 Get the size of the largest block that can be updated in a fault-tolerant manner.
138
139 @param[in] This Indicates a pointer to the calling context.
140 @param[out] BlockSize A pointer to a caller-allocated UINTN that is
141 updated to indicate the size of the largest block
142 that can be updated.
143
144 @retval EFI_SUCCESS The function completed successfully.
145 @retval EFI_ABORTED The function could not complete successfully.
146
147 **/
148 EFI_STATUS
149 EFIAPI
150 FtwGetMaxBlockSize (
151 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
152 OUT UINTN *BlockSize
153 )
154 {
155 EFI_STATUS Status;
156 UINTN PayloadSize;
157 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
158 SMM_FTW_GET_MAX_BLOCK_SIZE_HEADER *SmmFtwBlockSizeHeader;
159
160 //
161 // Initialize the communicate buffer.
162 //
163 PayloadSize = sizeof (SMM_FTW_GET_MAX_BLOCK_SIZE_HEADER);
164 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, (VOID **)&SmmFtwBlockSizeHeader, PayloadSize, FTW_FUNCTION_GET_MAX_BLOCK_SIZE);
165
166 //
167 // Send data to SMM.
168 //
169 Status = SendCommunicateBuffer (SmmCommunicateHeader, PayloadSize);
170
171 //
172 // Get data from SMM
173 //
174 *BlockSize = SmmFtwBlockSizeHeader->BlockSize;
175 FreePool (SmmCommunicateHeader);
176
177 return Status;
178 }
179
180
181 /**
182 Allocates space for the protocol to maintain information about writes.
183 Since writes must be completed in a fault-tolerant manner and multiple
184 writes require more resources to be successful, this function
185 enables the protocol to ensure that enough space exists to track
186 information about upcoming writes.
187
188 @param[in] This A pointer to the calling context.
189 @param[in] CallerId The GUID identifying the write.
190 @param[in] PrivateDataSize The size of the caller's private data that must be
191 recorded for each write.
192 @param[in] NumberOfWrites The number of fault tolerant block writes that will
193 need to occur.
194
195 @retval EFI_SUCCESS The function completed successfully
196 @retval EFI_ABORTED The function could not complete successfully.
197 @retval EFI_ACCESS_DENIED Not all allocated writes have been completed. All
198 writes must be completed or aborted before another
199 fault tolerant write can occur.
200
201 **/
202 EFI_STATUS
203 EFIAPI
204 FtwAllocate (
205 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
206 IN EFI_GUID *CallerId,
207 IN UINTN PrivateDataSize,
208 IN UINTN NumberOfWrites
209 )
210 {
211 EFI_STATUS Status;
212 UINTN PayloadSize;
213 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
214 SMM_FTW_ALLOCATE_HEADER *SmmFtwAllocateHeader;
215
216 //
217 // Initialize the communicate buffer.
218 //
219 PayloadSize = sizeof (SMM_FTW_ALLOCATE_HEADER);
220 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, (VOID **)&SmmFtwAllocateHeader, PayloadSize, FTW_FUNCTION_ALLOCATE);
221 CopyGuid (&SmmFtwAllocateHeader->CallerId, CallerId);
222 SmmFtwAllocateHeader->PrivateDataSize = PrivateDataSize;
223 SmmFtwAllocateHeader->NumberOfWrites = NumberOfWrites;
224
225 //
226 // Send data to SMM.
227 //
228 Status = SendCommunicateBuffer (SmmCommunicateHeader, PayloadSize);
229 if (!EFI_ERROR( Status)) {
230 mPrivateDataSize = PrivateDataSize;
231 }
232
233 FreePool (SmmCommunicateHeader);
234 return Status;
235 }
236
237
238 /**
239 Starts a target block update. This records information about the write
240 in fault tolerant storage, and will complete the write in a recoverable
241 manner, ensuring at all times that either the original contents or
242 the modified contents are available.
243
244 @param[in] This The calling context.
245 @param[in] Lba The logical block address of the target block.
246 @param[in] Offset The offset within the target block to place the
247 data.
248 @param[in] Length The number of bytes to write to the target block.
249 @param[in] PrivateData A pointer to private data that the caller requires
250 to complete any pending writes in the event of a
251 fault.
252 @param[in] FvBlockHandle The handle of FVB protocol that provides services
253 for reading, writing, and erasing the target block.
254 @param[in] Buffer The data to write.
255
256 @retval EFI_SUCCESS The function completed successfully.
257 @retval EFI_ABORTED The function could not complete successfully.
258 @retval EFI_BAD_BUFFER_SIZE The write would span a block boundary, which is not
259 a valid action.
260 @retval EFI_ACCESS_DENIED No writes have been allocated.
261 @retval EFI_NOT_READY The last write has not been completed. Restart()
262 must be called to complete it.
263
264 **/
265 EFI_STATUS
266 EFIAPI
267 FtwWrite (
268 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
269 IN EFI_LBA Lba,
270 IN UINTN Offset,
271 IN UINTN Length,
272 IN VOID *PrivateData,
273 IN EFI_HANDLE FvBlockHandle,
274 IN VOID *Buffer
275 )
276 {
277 EFI_STATUS Status;
278 UINTN PayloadSize;
279 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
280 SMM_FTW_WRITE_HEADER *SmmFtwWriteHeader;
281
282 //
283 // Initialize the communicate buffer.
284 //
285 PayloadSize = OFFSET_OF (SMM_FTW_WRITE_HEADER, Data) + Length;
286 if (PrivateData != NULL) {
287 //
288 // The private data buffer size should be the same one in FtwAllocate API.
289 //
290 PayloadSize += mPrivateDataSize;
291 }
292 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, (VOID **)&SmmFtwWriteHeader, PayloadSize, FTW_FUNCTION_WRITE);
293
294 //
295 // FvBlockHandle can not be used in SMM environment. Here we get the FVB protocol first, then get FVB base address
296 // and its attribute. Send these information to SMM handler, the SMM handler will find the proper FVB to write data.
297 //
298 Status = ConvertFvbHandle (FvBlockHandle, &SmmFtwWriteHeader->FvbBaseAddress, &SmmFtwWriteHeader->FvbAttributes);
299 if (EFI_ERROR (Status)) {
300 FreePool (SmmCommunicateHeader);
301 return EFI_ABORTED;
302 }
303
304 SmmFtwWriteHeader->Lba = Lba;
305 SmmFtwWriteHeader->Offset = Offset;
306 SmmFtwWriteHeader->Length = Length;
307 CopyMem (SmmFtwWriteHeader->Data, Buffer, Length);
308 if (PrivateData == NULL) {
309 SmmFtwWriteHeader->PrivateDataSize = 0;
310 } else {
311 SmmFtwWriteHeader->PrivateDataSize = mPrivateDataSize;
312 CopyMem (&SmmFtwWriteHeader->Data[Length], PrivateData, mPrivateDataSize);
313 }
314
315 //
316 // Send data to SMM.
317 //
318 Status = SendCommunicateBuffer (SmmCommunicateHeader, PayloadSize);
319 FreePool (SmmCommunicateHeader);
320 return Status;
321 }
322
323
324 /**
325 Restarts a previously interrupted write. The caller must provide the
326 block protocol needed to complete the interrupted write.
327
328 @param[in] This The calling context.
329 @param[in] FvBlockHandle The handle of FVB protocol that provides services.
330
331 @retval EFI_SUCCESS The function completed successfully.
332 @retval EFI_ABORTED The function could not complete successfully.
333 @retval EFI_ACCESS_DENIED No pending writes exist.
334
335 **/
336 EFI_STATUS
337 EFIAPI
338 FtwRestart (
339 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
340 IN EFI_HANDLE FvBlockHandle
341 )
342 {
343 EFI_STATUS Status;
344 UINTN PayloadSize;
345 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
346 SMM_FTW_RESTART_HEADER *SmmFtwRestartHeader;
347
348 //
349 // Initialize the communicate buffer.
350 //
351 PayloadSize = sizeof (SMM_FTW_RESTART_HEADER);
352 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, (VOID **)&SmmFtwRestartHeader, PayloadSize, FTW_FUNCTION_RESTART);
353
354 //
355 // FvBlockHandle can not be used in SMM environment. Here we get the FVB protocol first, then get FVB base address
356 // and its attribute. Send these information to SMM handler, the SMM handler will find the proper FVB to write data.
357 //
358 Status = ConvertFvbHandle (FvBlockHandle, &SmmFtwRestartHeader->FvbBaseAddress, &SmmFtwRestartHeader->FvbAttributes);
359 if (EFI_ERROR (Status)) {
360 FreePool (SmmCommunicateHeader);
361 return EFI_ABORTED;
362 }
363
364 //
365 // Send data to SMM.
366 //
367 Status = SendCommunicateBuffer (SmmCommunicateHeader, PayloadSize);
368 FreePool (SmmCommunicateHeader);
369 return Status;
370 }
371
372
373 /**
374 Aborts all previously allocated writes.
375
376 @param[in] This The calling context.
377
378 @retval EFI_SUCCESS The function completed successfully.
379 @retval EFI_ABORTED The function could not complete successfully.
380 @retval EFI_NOT_FOUND No allocated writes exist.
381
382 **/
383 EFI_STATUS
384 EFIAPI
385 FtwAbort (
386 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This
387 )
388 {
389 EFI_STATUS Status;
390 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
391
392 //
393 // Initialize the communicate buffer.
394 //
395 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, NULL, 0, FTW_FUNCTION_ABORT);
396
397 //
398 // Send data to SMM.
399 //
400 Status = SendCommunicateBuffer (SmmCommunicateHeader, 0);
401
402 FreePool (SmmCommunicateHeader);
403 return Status;
404 }
405
406
407 /**
408 Starts a target block update. This function records information about the write
409 in fault-tolerant storage and completes the write in a recoverable
410 manner, ensuring at all times that either the original contents or
411 the modified contents are available.
412
413 @param[in] This Indicates a pointer to the calling context.
414 @param[out] CallerId The GUID identifying the last write.
415 @param[out] Lba The logical block address of the last write.
416 @param[out] Offset The offset within the block of the last write.
417 @param[out] Length The length of the last write.
418 @param[in, out] PrivateDataSize On input, the size of the PrivateData buffer. On
419 output, the size of the private data stored for
420 this write.
421 @param[out] PrivateData A pointer to a buffer. The function will copy
422 PrivateDataSize bytes from the private data stored
423 for this write.
424 @param[out] Complete A Boolean value with TRUE indicating that the write
425 was completed.
426
427 @retval EFI_SUCCESS The function completed successfully.
428 @retval EFI_ABORTED The function could not complete successfully.
429 @retval EFI_NOT_FOUND No allocated writes exist.
430
431 **/
432 EFI_STATUS
433 EFIAPI
434 FtwGetLastWrite (
435 IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
436 OUT EFI_GUID *CallerId,
437 OUT EFI_LBA *Lba,
438 OUT UINTN *Offset,
439 OUT UINTN *Length,
440 IN OUT UINTN *PrivateDataSize,
441 OUT VOID *PrivateData,
442 OUT BOOLEAN *Complete
443 )
444 {
445 EFI_STATUS Status;
446 UINTN PayloadSize;
447 EFI_SMM_COMMUNICATE_HEADER *SmmCommunicateHeader;
448 SMM_FTW_GET_LAST_WRITE_HEADER *SmmFtwGetLastWriteHeader;
449
450 //
451 // Initialize the communicate buffer.
452 //
453 PayloadSize = OFFSET_OF (SMM_FTW_GET_LAST_WRITE_HEADER, Data) + *PrivateDataSize;
454 InitCommunicateBuffer ((VOID **)&SmmCommunicateHeader, (VOID **)&SmmFtwGetLastWriteHeader, PayloadSize, FTW_FUNCTION_GET_LAST_WRITE);
455 SmmFtwGetLastWriteHeader->PrivateDataSize = *PrivateDataSize;
456
457 //
458 // Send data to SMM.
459 //
460 Status = SendCommunicateBuffer (SmmCommunicateHeader, PayloadSize);
461
462 //
463 // Get data from SMM
464 //
465 *PrivateDataSize = SmmFtwGetLastWriteHeader->PrivateDataSize;
466 if (!EFI_ERROR (Status)) {
467 *Lba = SmmFtwGetLastWriteHeader->Lba;
468 *Offset = SmmFtwGetLastWriteHeader->Offset;
469 *Length = SmmFtwGetLastWriteHeader->Length;
470 *Complete = SmmFtwGetLastWriteHeader->Complete;
471 CopyGuid (CallerId, &SmmFtwGetLastWriteHeader->CallerId);
472 CopyMem (PrivateData, SmmFtwGetLastWriteHeader->Data, *PrivateDataSize);
473 }
474
475 FreePool (SmmCommunicateHeader);
476 return Status;
477 }
478
479 /**
480 SMM Fault Tolerant Write Protocol notification event handler.
481
482 Install Fault Tolerant Write Protocol.
483
484 @param[in] Event Event whose notification function is being invoked.
485 @param[in] Context Pointer to the notification function's context.
486 **/
487 VOID
488 EFIAPI
489 SmmFtwReady (
490 IN EFI_EVENT Event,
491 IN VOID *Context
492 )
493 {
494 EFI_STATUS Status;
495 EFI_FAULT_TOLERANT_WRITE_PROTOCOL *FtwProtocol;
496
497 //
498 // Just return to avoid install SMM FaultTolerantWriteProtocol again
499 // if Fault Tolerant Write protocol had been installed.
500 //
501 Status = gBS->LocateProtocol (&gEfiFaultTolerantWriteProtocolGuid, NULL, (VOID **)&FtwProtocol);
502 if (!EFI_ERROR (Status)) {
503 return;
504 }
505
506 Status = gBS->LocateProtocol (&gEfiSmmCommunicationProtocolGuid, NULL, (VOID **) &mSmmCommunication);
507 ASSERT_EFI_ERROR (Status);
508
509 //
510 // Install protocol interface
511 //
512 Status = gBS->InstallProtocolInterface (
513 &mHandle,
514 &gEfiFaultTolerantWriteProtocolGuid,
515 EFI_NATIVE_INTERFACE,
516 &mFaultTolerantWriteDriver
517 );
518 ASSERT_EFI_ERROR (Status);
519
520 Status = gBS->CloseEvent (Event);
521 ASSERT_EFI_ERROR (Status);
522 }
523
524
525 /**
526 The driver entry point for Fault Tolerant Write driver.
527
528 The function does the necessary initialization work.
529
530 @param[in] ImageHandle The firmware allocated handle for the UEFI image.
531 @param[in] SystemTable A pointer to the EFI system table.
532
533 @retval EFI_SUCCESS This funtion always return EFI_SUCCESS.
534
535 **/
536 EFI_STATUS
537 EFIAPI
538 FaultTolerantWriteSmmInitialize (
539 IN EFI_HANDLE ImageHandle,
540 IN EFI_SYSTEM_TABLE *SystemTable
541 )
542 {
543 VOID *SmmFtwRegistration;
544
545 //
546 // Smm FTW driver is ready
547 //
548 EfiCreateProtocolNotifyEvent (
549 &gEfiSmmFaultTolerantWriteProtocolGuid,
550 TPL_CALLBACK,
551 SmmFtwReady,
552 NULL,
553 &SmmFtwRegistration
554 );
555
556 return EFI_SUCCESS;
557 }
558
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