summaryrefslogtreecommitdiff
path: root/MdeModulePkg/Universal/FaultTolerantWriteDxe/UpdateWorkingBlock.c
blob: 4690a08d532f48ca270f4c205973dfb0f76bd815 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
/** @file

   Internal functions to operate Working Block Space.

Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 

**/


#include "FaultTolerantWrite.h"

/**
  Check to see if it is a valid work space.


  @param WorkingHeader   Pointer of working block header

  @retval  EFI_SUCCESS    The function completed successfully
  @retval  EFI_ABORTED    The function could not complete successfully.

**/
BOOLEAN
IsValidWorkSpace (
  IN EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingHeader
  )
{
  EFI_STATUS                              Status;
  EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER WorkingBlockHeader;

  if (WorkingHeader == NULL) {
    return FALSE;
  }

  if (WorkingHeader->WorkingBlockValid != FTW_VALID_STATE) {
    DEBUG ((EFI_D_ERROR, "Ftw: Work block header valid bit check error\n"));
    return FALSE;
  }
  //
  // Check signature with gEfiSystemNvDataFvGuid
  //
  if (!CompareGuid (&gEfiSystemNvDataFvGuid, &WorkingHeader->Signature)) {
    DEBUG ((EFI_D_ERROR, "Ftw: Work block header signature check error\n"));
    return FALSE;
  }
  //
  // Check the CRC of header
  //
  CopyMem (
    &WorkingBlockHeader,
    WorkingHeader,
    sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER)
    );

  //
  // Filter out the Crc and State fields
  //
  SetMem (
    &WorkingBlockHeader.Crc,
    sizeof (UINT32),
    FTW_ERASED_BYTE
    );
  WorkingBlockHeader.WorkingBlockValid    = FTW_ERASE_POLARITY;
  WorkingBlockHeader.WorkingBlockInvalid  = FTW_ERASE_POLARITY;

  //
  // Calculate the Crc of woking block header
  //
  Status = gBS->CalculateCrc32 (
                  (UINT8 *) &WorkingBlockHeader,
                  sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER),
                  &WorkingBlockHeader.Crc
                  );
  if (EFI_ERROR (Status)) {
    return FALSE;
  }

  if (WorkingBlockHeader.Crc != WorkingHeader->Crc) {
    DEBUG ((EFI_D_ERROR, "Ftw: Work block header CRC check error\n"));
    return FALSE;
  }

  return TRUE;
}

/**
  Initialize a work space when there is no work space.

  @param WorkingHeader   Pointer of working block header

  @retval  EFI_SUCCESS    The function completed successfully
  @retval  EFI_ABORTED    The function could not complete successfully.

**/
EFI_STATUS
InitWorkSpaceHeader (
  IN EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingHeader
  )
{
  EFI_STATUS  Status;

  if (WorkingHeader == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  //
  // Here using gEfiSystemNvDataFvGuid as the signature.
  //
  CopyMem (
    &WorkingHeader->Signature,
    &gEfiSystemNvDataFvGuid,
    sizeof (EFI_GUID)
    );
  WorkingHeader->WriteQueueSize = (UINT64) (PcdGet32 (PcdFlashNvStorageFtwWorkingSize) - sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER));

  //
  // Crc is calculated with all the fields except Crc and STATE
  //
  WorkingHeader->WorkingBlockValid    = FTW_ERASE_POLARITY;
  WorkingHeader->WorkingBlockInvalid  = FTW_ERASE_POLARITY;

  SetMem (
    &WorkingHeader->Crc,
    sizeof (UINT32),
    FTW_ERASED_BYTE
    );

  //
  // Calculate the CRC value
  //
  Status = gBS->CalculateCrc32 (
                  (UINT8 *) WorkingHeader,
                  sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER),
                  &WorkingHeader->Crc
                  );
  if (EFI_ERROR (Status)) {
    return EFI_ABORTED;
  }
  //
  // Restore the WorkingBlockValid flag to VALID state
  //
  WorkingHeader->WorkingBlockValid    = FTW_VALID_STATE;
  WorkingHeader->WorkingBlockInvalid  = FTW_INVALID_STATE;

  return EFI_SUCCESS;
}

/**
  Read from working block to refresh the work space in memory.

  @param FtwDevice   Point to private data of FTW driver

  @retval  EFI_SUCCESS    The function completed successfully
  @retval  EFI_ABORTED    The function could not complete successfully.

**/
EFI_STATUS
WorkSpaceRefresh (
  IN EFI_FTW_DEVICE  *FtwDevice
  )
{
  EFI_STATUS                      Status;
  UINTN                           Length;
  UINTN                           Offset;
  EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader;

  //
  // Initialize WorkSpace as FTW_ERASED_BYTE
  //
  SetMem (
    FtwDevice->FtwWorkSpace,
    FtwDevice->FtwWorkSpaceSize,
    FTW_ERASED_BYTE
    );

  //
  // Read from working block
  //
  Length = FtwDevice->FtwWorkSpaceSize;
  Status = FtwDevice->FtwFvBlock->Read (
                                    FtwDevice->FtwFvBlock,
                                    FtwDevice->FtwWorkSpaceLba,
                                    FtwDevice->FtwWorkSpaceBase,
                                    &Length,
                                    FtwDevice->FtwWorkSpace
                                    );
  if (EFI_ERROR (Status)) {
    return EFI_ABORTED;
  }
  //
  // Refresh the FtwLastWriteHeader
  //
  Status = FtwGetLastWriteHeader (
            FtwDevice->FtwWorkSpaceHeader,
            FtwDevice->FtwWorkSpaceSize,
            &FtwDevice->FtwLastWriteHeader
            );

  FtwHeader = FtwDevice->FtwLastWriteHeader;
  Offset    = (UINTN) (UINT8 *) FtwHeader - (UINTN) FtwDevice->FtwWorkSpace;

  //
  // if the Header is out of the workspace limit, call reclaim.
  //
  if (EFI_ERROR (Status) && (Offset >= FtwDevice->FtwWorkSpaceSize)) {
    //
    // reclaim work space in working block.
    //
    Status = FtwReclaimWorkSpace (FtwDevice, TRUE);
    if (EFI_ERROR (Status)) {
      DEBUG ((EFI_D_ERROR, "Ftw: Reclaim workspace - %r\n", Status));
      return EFI_ABORTED;
    }
    //
    // Read from working block again
    //
    Length = FtwDevice->FtwWorkSpaceSize;
    Status = FtwDevice->FtwFvBlock->Read (
                                      FtwDevice->FtwFvBlock,
                                      FtwDevice->FtwWorkSpaceLba,
                                      FtwDevice->FtwWorkSpaceBase,
                                      &Length,
                                      FtwDevice->FtwWorkSpace
                                      );
    if (EFI_ERROR (Status)) {
      return EFI_ABORTED;
    }

    Status = FtwGetLastWriteHeader (
              FtwDevice->FtwWorkSpaceHeader,
              FtwDevice->FtwWorkSpaceSize,
              &FtwDevice->FtwLastWriteHeader
              );
  }
  //
  // Refresh the FtwLastWriteRecord
  //
  Status = FtwGetLastWriteRecord (
            FtwDevice->FtwLastWriteHeader,
            &FtwDevice->FtwLastWriteRecord
            );
  if (EFI_ERROR (Status)) {
    return EFI_ABORTED;
  }

  return EFI_SUCCESS;
}

/**
  Reclaim the work space on the working block.

  @param FtwDevice       Point to private data of FTW driver
  @param PreserveRecord  Whether to preserve the working record is needed

  @retval EFI_SUCCESS            The function completed successfully
  @retval EFI_OUT_OF_RESOURCES   Allocate memory error
  @retval EFI_ABORTED            The function could not complete successfully

**/
EFI_STATUS
FtwReclaimWorkSpace (
  IN EFI_FTW_DEVICE  *FtwDevice,
  IN BOOLEAN         PreserveRecord
  )
{
  EFI_STATUS                              Status;
  UINTN                                   Length;
  EFI_FAULT_TOLERANT_WRITE_HEADER         *Header;
  UINT8                                   *TempBuffer;
  UINTN                                   TempBufferSize;
  UINTN                                   SpareBufferSize;
  UINT8                                   *SpareBuffer;
  EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingBlockHeader;
  UINTN                                   Index;
  UINT8                                   *Ptr;

  DEBUG ((EFI_D_ERROR, "Ftw: start to reclaim work space\n"));

  //
  // Read all original data from working block to a memory buffer
  //
  TempBufferSize = FtwDevice->SpareAreaLength;
  TempBuffer     = AllocateZeroPool (TempBufferSize);
  if (TempBuffer == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Ptr = TempBuffer;
  for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
    Length = FtwDevice->BlockSize;
    Status = FtwDevice->FtwFvBlock->Read (
                                          FtwDevice->FtwFvBlock,
                                          FtwDevice->FtwWorkBlockLba + Index,
                                          0,
                                          &Length,
                                          Ptr
                                          );
    if (EFI_ERROR (Status)) {
      FreePool (TempBuffer);
      return EFI_ABORTED;
    }

    Ptr += Length;
  }
  //
  // Clean up the workspace, remove all the completed records.
  //
  Ptr = TempBuffer +
        ((UINTN) (FtwDevice->FtwWorkSpaceLba - FtwDevice->FtwWorkBlockLba)) * FtwDevice->BlockSize + 
        FtwDevice->FtwWorkSpaceBase;

  //
  // Clear the content of buffer that will save the new work space data
  //
  SetMem (Ptr, FtwDevice->FtwWorkSpaceSize, FTW_ERASED_BYTE);

  //
  // Copy EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER to buffer
  //
  CopyMem (
    Ptr,
    FtwDevice->FtwWorkSpaceHeader,
    sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER)
    );
  if (PreserveRecord) {
    //
    // Get the last record following the header,
    //
    Status = FtwGetLastWriteHeader (
               FtwDevice->FtwWorkSpaceHeader,
               FtwDevice->FtwWorkSpaceSize,
               &FtwDevice->FtwLastWriteHeader
               );
    Header = FtwDevice->FtwLastWriteHeader;
    if (!EFI_ERROR (Status) && (Header != NULL) && (Header->Complete != FTW_VALID_STATE)) {
      CopyMem (
        Ptr + sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER),
        FtwDevice->FtwLastWriteHeader,
        WRITE_TOTAL_SIZE (Header->NumberOfWrites, Header->PrivateDataSize)
        );
    }
  }

  CopyMem (
    FtwDevice->FtwWorkSpace,
    Ptr,
    FtwDevice->FtwWorkSpaceSize
    );

  FtwGetLastWriteHeader (
    FtwDevice->FtwWorkSpaceHeader,
    FtwDevice->FtwWorkSpaceSize,
    &FtwDevice->FtwLastWriteHeader
    );

  //
  // Set the WorkingBlockValid and WorkingBlockInvalid as INVALID
  //
  WorkingBlockHeader                      = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *) (TempBuffer + FtwDevice->FtwWorkSpaceBase);
  WorkingBlockHeader->WorkingBlockValid   = FTW_INVALID_STATE;
  WorkingBlockHeader->WorkingBlockInvalid = FTW_INVALID_STATE;

  //
  // Try to keep the content of spare block
  // Save spare block into a spare backup memory buffer (Sparebuffer)
  //
  SpareBufferSize = FtwDevice->SpareAreaLength;
  SpareBuffer     = AllocatePool (SpareBufferSize);
  if (SpareBuffer == NULL) {
    FreePool (TempBuffer);
    return EFI_OUT_OF_RESOURCES;
  }

  Ptr = SpareBuffer;
  for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
    Length = FtwDevice->BlockSize;
    Status = FtwDevice->FtwBackupFvb->Read (
                                        FtwDevice->FtwBackupFvb,
                                        FtwDevice->FtwSpareLba + Index,
                                        0,
                                        &Length,
                                        Ptr
                                        );
    if (EFI_ERROR (Status)) {
      FreePool (TempBuffer);
      FreePool (SpareBuffer);
      return EFI_ABORTED;
    }

    Ptr += Length;
  }
  //
  // Write the memory buffer to spare block
  //
  Status  = FtwEraseSpareBlock (FtwDevice);
  Ptr     = TempBuffer;
  for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
    Length = FtwDevice->BlockSize;
    Status = FtwDevice->FtwBackupFvb->Write (
                                            FtwDevice->FtwBackupFvb,
                                            FtwDevice->FtwSpareLba + Index,
                                            0,
                                            &Length,
                                            Ptr
                                            );
    if (EFI_ERROR (Status)) {
      FreePool (TempBuffer);
      FreePool (SpareBuffer);
      return EFI_ABORTED;
    }

    Ptr += Length;
  }
  //
  // Free TempBuffer
  //
  FreePool (TempBuffer);

  //
  // Set the WorkingBlockValid in spare block
  //
  Status = FtwUpdateFvState (
            FtwDevice->FtwBackupFvb,
            FtwDevice->FtwWorkSpaceLba,
            FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
            WORKING_BLOCK_VALID
            );
  if (EFI_ERROR (Status)) {
    FreePool (SpareBuffer);
    return EFI_ABORTED;
  }
  //
  // Before erase the working block, set WorkingBlockInvalid in working block.
  //
  // Offset = OFFSET_OF(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER,
  //                          WorkingBlockInvalid);
  //
  Status = FtwUpdateFvState (
            FtwDevice->FtwFvBlock,
            FtwDevice->FtwWorkSpaceLba,
            FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
            WORKING_BLOCK_INVALID
            );
  if (EFI_ERROR (Status)) {
    FreePool (SpareBuffer);
    return EFI_ABORTED;
  }

  FtwDevice->FtwWorkSpaceHeader->WorkingBlockInvalid = FTW_VALID_STATE;

  //
  // Write the spare block to working block
  //
  Status = FlushSpareBlockToWorkingBlock (FtwDevice);
  if (EFI_ERROR (Status)) {
    FreePool (SpareBuffer);
    return Status;
  }
  //
  // Restore spare backup buffer into spare block , if no failure happened during FtwWrite.
  //
  Status  = FtwEraseSpareBlock (FtwDevice);
  Ptr     = SpareBuffer;
  for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
    Length = FtwDevice->BlockSize;
    Status = FtwDevice->FtwBackupFvb->Write (
                                        FtwDevice->FtwBackupFvb,
                                        FtwDevice->FtwSpareLba + Index,
                                        0,
                                        &Length,
                                        Ptr
                                        );
    if (EFI_ERROR (Status)) {
      FreePool (SpareBuffer);
      return EFI_ABORTED;
    }

    Ptr += Length;
  }

  FreePool (SpareBuffer);

  DEBUG ((EFI_D_ERROR, "Ftw: reclaim work space successfully\n"));

  return EFI_SUCCESS;
}