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1 | /** @file\r |
2 | \r | |
3 | Generic non-coherent implementation of DmaLib.h\r | |
4 | \r | |
5 | Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
6 | Copyright (c) 2015 - 2017, Linaro, Ltd. All rights reserved.<BR>\r | |
7 | \r | |
8 | This program and the accompanying materials are licensed and made\r | |
9 | available under the terms and conditions of the BSD License which\r | |
10 | accompanies this distribution. The full text of the license may be\r | |
11 | found at http://opensource.org/licenses/bsd-license.php\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR\r | |
15 | IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #include <PiDxe.h>\r | |
20 | #include <Library/BaseLib.h>\r | |
21 | #include <Library/DebugLib.h>\r | |
22 | #include <Library/DmaLib.h>\r | |
23 | #include <Library/DxeServicesTableLib.h>\r | |
24 | #include <Library/MemoryAllocationLib.h>\r | |
25 | #include <Library/UefiBootServicesTableLib.h>\r | |
26 | #include <Library/IoLib.h>\r | |
27 | #include <Library/BaseMemoryLib.h>\r | |
28 | \r | |
29 | #include <Protocol/Cpu.h>\r | |
30 | \r | |
31 | typedef struct {\r | |
32 | EFI_PHYSICAL_ADDRESS HostAddress;\r | |
33 | VOID *BufferAddress;\r | |
34 | UINTN NumberOfBytes;\r | |
35 | DMA_MAP_OPERATION Operation;\r | |
36 | BOOLEAN DoubleBuffer;\r | |
37 | } MAP_INFO_INSTANCE;\r | |
38 | \r | |
39 | \r | |
40 | typedef struct {\r | |
41 | LIST_ENTRY Link;\r | |
42 | VOID *HostAddress;\r | |
43 | UINTN NumPages;\r | |
44 | UINT64 Attributes;\r | |
45 | } UNCACHED_ALLOCATION;\r | |
46 | \r | |
47 | STATIC EFI_CPU_ARCH_PROTOCOL *mCpu;\r | |
48 | STATIC LIST_ENTRY UncachedAllocationList;\r | |
49 | \r | |
50 | STATIC\r | |
51 | PHYSICAL_ADDRESS\r | |
52 | HostToDeviceAddress (\r | |
53 | IN VOID *Address\r | |
54 | )\r | |
55 | {\r | |
56 | return (PHYSICAL_ADDRESS)(UINTN)Address + PcdGet64 (PcdDmaDeviceOffset);\r | |
57 | }\r | |
58 | \r | |
59 | /**\r | |
60 | Provides the DMA controller-specific addresses needed to access system memory.\r | |
61 | \r | |
62 | Operation is relative to the DMA bus master.\r | |
63 | \r | |
64 | @param Operation Indicates if the bus master is going to read or\r | |
65 | write to system memory.\r | |
66 | @param HostAddress The system memory address to map to the DMA\r | |
67 | controller.\r | |
68 | @param NumberOfBytes On input the number of bytes to map. On output\r | |
69 | the number of bytes that were mapped.\r | |
70 | @param DeviceAddress The resulting map address for the bus master\r | |
71 | controller to use to access the host's\r | |
72 | HostAddress.\r | |
73 | @param Mapping A resulting value to pass to Unmap().\r | |
74 | \r | |
75 | @retval EFI_SUCCESS The range was mapped for the returned\r | |
76 | NumberOfBytes.\r | |
77 | @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a common\r | |
78 | buffer.\r | |
79 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
80 | @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack\r | |
81 | of resources.\r | |
82 | @retval EFI_DEVICE_ERROR The system hardware could not map the requested\r | |
83 | address.\r | |
84 | \r | |
85 | **/\r | |
86 | EFI_STATUS\r | |
87 | EFIAPI\r | |
88 | DmaMap (\r | |
89 | IN DMA_MAP_OPERATION Operation,\r | |
90 | IN VOID *HostAddress,\r | |
91 | IN OUT UINTN *NumberOfBytes,\r | |
92 | OUT PHYSICAL_ADDRESS *DeviceAddress,\r | |
93 | OUT VOID **Mapping\r | |
94 | )\r | |
95 | {\r | |
96 | EFI_STATUS Status;\r | |
97 | MAP_INFO_INSTANCE *Map;\r | |
98 | VOID *Buffer;\r | |
99 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r | |
100 | UINTN AllocSize;\r | |
101 | \r | |
102 | if (HostAddress == NULL ||\r | |
103 | NumberOfBytes == NULL ||\r | |
104 | DeviceAddress == NULL ||\r | |
105 | Mapping == NULL ) {\r | |
106 | return EFI_INVALID_PARAMETER;\r | |
107 | }\r | |
108 | \r | |
109 | if (Operation >= MapOperationMaximum) {\r | |
110 | return EFI_INVALID_PARAMETER;\r | |
111 | }\r | |
112 | \r | |
113 | *DeviceAddress = HostToDeviceAddress (HostAddress);\r | |
114 | \r | |
115 | // Remember range so we can flush on the other side\r | |
116 | Map = AllocatePool (sizeof (MAP_INFO_INSTANCE));\r | |
117 | if (Map == NULL) {\r | |
118 | return EFI_OUT_OF_RESOURCES;\r | |
119 | }\r | |
120 | \r | |
121 | if (Operation != MapOperationBusMasterRead &&\r | |
122 | ((((UINTN)HostAddress & (mCpu->DmaBufferAlignment - 1)) != 0) ||\r | |
123 | ((*NumberOfBytes & (mCpu->DmaBufferAlignment - 1)) != 0))) {\r | |
124 | \r | |
125 | // Get the cacheability of the region\r | |
126 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);\r | |
127 | if (EFI_ERROR(Status)) {\r | |
128 | goto FreeMapInfo;\r | |
129 | }\r | |
130 | \r | |
131 | // If the mapped buffer is not an uncached buffer\r | |
132 | if ((GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) != 0) {\r | |
133 | //\r | |
134 | // Operations of type MapOperationBusMasterCommonBuffer are only allowed\r | |
135 | // on uncached buffers.\r | |
136 | //\r | |
137 | if (Operation == MapOperationBusMasterCommonBuffer) {\r | |
138 | DEBUG ((DEBUG_ERROR,\r | |
139 | "%a: Operation type 'MapOperationBusMasterCommonBuffer' is only "\r | |
140 | "supported\non memory regions that were allocated using "\r | |
141 | "DmaAllocateBuffer ()\n", __FUNCTION__));\r | |
142 | Status = EFI_UNSUPPORTED;\r | |
143 | goto FreeMapInfo;\r | |
144 | }\r | |
145 | \r | |
146 | //\r | |
147 | // If the buffer does not fill entire cache lines we must double buffer\r | |
148 | // into a suitably aligned allocation that allows us to invalidate the\r | |
149 | // cache without running the risk of corrupting adjacent unrelated data.\r | |
150 | // Note that pool allocations are guaranteed to be 8 byte aligned, so\r | |
151 | // we only have to add (alignment - 8) worth of padding.\r | |
152 | //\r | |
153 | Map->DoubleBuffer = TRUE;\r | |
154 | AllocSize = ALIGN_VALUE (*NumberOfBytes, mCpu->DmaBufferAlignment) +\r | |
155 | (mCpu->DmaBufferAlignment - 8);\r | |
156 | Map->BufferAddress = AllocatePool (AllocSize);\r | |
157 | if (Map->BufferAddress == NULL) {\r | |
158 | Status = EFI_OUT_OF_RESOURCES;\r | |
159 | goto FreeMapInfo;\r | |
160 | }\r | |
161 | \r | |
162 | Buffer = ALIGN_POINTER (Map->BufferAddress, mCpu->DmaBufferAlignment);\r | |
163 | *DeviceAddress = HostToDeviceAddress (Buffer);\r | |
164 | \r | |
165 | //\r | |
166 | // Get rid of any dirty cachelines covering the double buffer. This\r | |
167 | // prevents them from being written back unexpectedly, potentially\r | |
168 | // overwriting the data we receive from the device.\r | |
169 | //\r | |
170 | mCpu->FlushDataCache (mCpu, (UINTN)Buffer, *NumberOfBytes,\r | |
171 | EfiCpuFlushTypeWriteBack);\r | |
172 | } else {\r | |
173 | Map->DoubleBuffer = FALSE;\r | |
174 | }\r | |
175 | } else {\r | |
176 | Map->DoubleBuffer = FALSE;\r | |
177 | \r | |
178 | DEBUG_CODE_BEGIN ();\r | |
179 | \r | |
180 | //\r | |
181 | // The operation type check above only executes if the buffer happens to be\r | |
182 | // misaligned with respect to CWG, but even if it is aligned, we should not\r | |
183 | // allow arbitrary buffers to be used for creating consistent mappings.\r | |
184 | // So duplicate the check here when running in DEBUG mode, just to assert\r | |
185 | // that we are not trying to create a consistent mapping for cached memory.\r | |
186 | //\r | |
187 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)HostAddress, &GcdDescriptor);\r | |
188 | ASSERT_EFI_ERROR(Status);\r | |
189 | \r | |
190 | ASSERT (Operation != MapOperationBusMasterCommonBuffer ||\r | |
191 | (GcdDescriptor.Attributes & (EFI_MEMORY_WB | EFI_MEMORY_WT)) == 0);\r | |
192 | \r | |
193 | DEBUG_CODE_END ();\r | |
194 | \r | |
195 | // Flush the Data Cache (should not have any effect if the memory region is\r | |
196 | // uncached)\r | |
197 | mCpu->FlushDataCache (mCpu, (UINTN)HostAddress, *NumberOfBytes,\r | |
198 | EfiCpuFlushTypeWriteBackInvalidate);\r | |
199 | }\r | |
200 | \r | |
201 | Map->HostAddress = (UINTN)HostAddress;\r | |
202 | Map->NumberOfBytes = *NumberOfBytes;\r | |
203 | Map->Operation = Operation;\r | |
204 | \r | |
205 | *Mapping = Map;\r | |
206 | \r | |
207 | return EFI_SUCCESS;\r | |
208 | \r | |
209 | FreeMapInfo:\r | |
210 | FreePool (Map);\r | |
211 | \r | |
212 | return Status;\r | |
213 | }\r | |
214 | \r | |
215 | \r | |
216 | /**\r | |
217 | Completes the DmaMapBusMasterRead(), DmaMapBusMasterWrite(), or\r | |
218 | DmaMapBusMasterCommonBuffer() operation and releases any corresponding\r | |
219 | resources.\r | |
220 | \r | |
221 | @param Mapping The mapping value returned from DmaMap*().\r | |
222 | \r | |
223 | @retval EFI_SUCCESS The range was unmapped.\r | |
224 | @retval EFI_DEVICE_ERROR The data was not committed to the target system\r | |
225 | memory.\r | |
226 | @retval EFI_INVALID_PARAMETER An inconsistency was detected between the\r | |
227 | mapping type and the DoubleBuffer field\r | |
228 | \r | |
229 | **/\r | |
230 | EFI_STATUS\r | |
231 | EFIAPI\r | |
232 | DmaUnmap (\r | |
233 | IN VOID *Mapping\r | |
234 | )\r | |
235 | {\r | |
236 | MAP_INFO_INSTANCE *Map;\r | |
237 | EFI_STATUS Status;\r | |
238 | VOID *Buffer;\r | |
239 | \r | |
240 | if (Mapping == NULL) {\r | |
241 | ASSERT (FALSE);\r | |
242 | return EFI_INVALID_PARAMETER;\r | |
243 | }\r | |
244 | \r | |
245 | Map = (MAP_INFO_INSTANCE *)Mapping;\r | |
246 | \r | |
247 | Status = EFI_SUCCESS;\r | |
248 | if (Map->DoubleBuffer) {\r | |
249 | ASSERT (Map->Operation == MapOperationBusMasterWrite);\r | |
250 | \r | |
251 | if (Map->Operation != MapOperationBusMasterWrite) {\r | |
252 | Status = EFI_INVALID_PARAMETER;\r | |
253 | } else {\r | |
254 | Buffer = ALIGN_POINTER (Map->BufferAddress, mCpu->DmaBufferAlignment);\r | |
255 | \r | |
256 | mCpu->FlushDataCache (mCpu, (UINTN)Buffer, Map->NumberOfBytes,\r | |
257 | EfiCpuFlushTypeInvalidate);\r | |
258 | \r | |
259 | CopyMem ((VOID *)(UINTN)Map->HostAddress, Buffer, Map->NumberOfBytes);\r | |
260 | \r | |
261 | FreePool (Map->BufferAddress);\r | |
262 | }\r | |
263 | } else {\r | |
264 | if (Map->Operation == MapOperationBusMasterWrite) {\r | |
265 | //\r | |
266 | // Make sure we read buffer from uncached memory and not the cache\r | |
267 | //\r | |
268 | mCpu->FlushDataCache (mCpu, Map->HostAddress, Map->NumberOfBytes,\r | |
269 | EfiCpuFlushTypeInvalidate);\r | |
270 | }\r | |
271 | }\r | |
272 | \r | |
273 | FreePool (Map);\r | |
274 | \r | |
275 | return Status;\r | |
276 | }\r | |
277 | \r | |
278 | /**\r | |
279 | Allocates pages that are suitable for an DmaMap() of type\r | |
280 | MapOperationBusMasterCommonBuffer mapping.\r | |
281 | \r | |
282 | @param MemoryType The type of memory to allocate,\r | |
283 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
284 | @param Pages The number of pages to allocate.\r | |
285 | @param HostAddress A pointer to store the base system memory\r | |
286 | address of the allocated range.\r | |
287 | \r | |
288 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
289 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
290 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
291 | \r | |
292 | **/\r | |
293 | EFI_STATUS\r | |
294 | EFIAPI\r | |
295 | DmaAllocateBuffer (\r | |
296 | IN EFI_MEMORY_TYPE MemoryType,\r | |
297 | IN UINTN Pages,\r | |
298 | OUT VOID **HostAddress\r | |
299 | )\r | |
300 | {\r | |
301 | return DmaAllocateAlignedBuffer (MemoryType, Pages, 0, HostAddress);\r | |
302 | }\r | |
303 | \r | |
304 | /**\r | |
305 | Allocates pages that are suitable for an DmaMap() of type\r | |
306 | MapOperationBusMasterCommonBuffer mapping, at the requested alignment.\r | |
307 | \r | |
308 | @param MemoryType The type of memory to allocate,\r | |
309 | EfiBootServicesData or EfiRuntimeServicesData.\r | |
310 | @param Pages The number of pages to allocate.\r | |
311 | @param Alignment Alignment in bytes of the base of the returned\r | |
312 | buffer (must be a power of 2)\r | |
313 | @param HostAddress A pointer to store the base system memory\r | |
314 | address of the allocated range.\r | |
315 | \r | |
316 | @retval EFI_SUCCESS The requested memory pages were allocated.\r | |
317 | @retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r | |
318 | @retval EFI_OUT_OF_RESOURCES The memory pages could not be allocated.\r | |
319 | \r | |
320 | **/\r | |
321 | EFI_STATUS\r | |
322 | EFIAPI\r | |
323 | DmaAllocateAlignedBuffer (\r | |
324 | IN EFI_MEMORY_TYPE MemoryType,\r | |
325 | IN UINTN Pages,\r | |
326 | IN UINTN Alignment,\r | |
327 | OUT VOID **HostAddress\r | |
328 | )\r | |
329 | {\r | |
330 | EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;\r | |
331 | VOID *Allocation;\r | |
332 | UINT64 MemType;\r | |
333 | UNCACHED_ALLOCATION *Alloc;\r | |
334 | EFI_STATUS Status;\r | |
335 | \r | |
336 | if (Alignment == 0) {\r | |
337 | Alignment = EFI_PAGE_SIZE;\r | |
338 | }\r | |
339 | \r | |
340 | if (HostAddress == NULL ||\r | |
341 | (Alignment & (Alignment - 1)) != 0) {\r | |
342 | return EFI_INVALID_PARAMETER;\r | |
343 | }\r | |
344 | \r | |
345 | if (MemoryType == EfiBootServicesData) {\r | |
346 | Allocation = AllocateAlignedPages (Pages, Alignment);\r | |
347 | } else if (MemoryType == EfiRuntimeServicesData) {\r | |
348 | Allocation = AllocateAlignedRuntimePages (Pages, Alignment);\r | |
349 | } else {\r | |
350 | return EFI_INVALID_PARAMETER;\r | |
351 | }\r | |
352 | \r | |
353 | if (Allocation == NULL) {\r | |
354 | return EFI_OUT_OF_RESOURCES;\r | |
355 | }\r | |
356 | \r | |
357 | // Get the cacheability of the region\r | |
358 | Status = gDS->GetMemorySpaceDescriptor ((UINTN)Allocation, &GcdDescriptor);\r | |
359 | if (EFI_ERROR(Status)) {\r | |
360 | goto FreeBuffer;\r | |
361 | }\r | |
362 | \r | |
363 | // Choose a suitable uncached memory type that is supported by the region\r | |
364 | if (GcdDescriptor.Capabilities & EFI_MEMORY_WC) {\r | |
365 | MemType = EFI_MEMORY_WC;\r | |
366 | } else if (GcdDescriptor.Capabilities & EFI_MEMORY_UC) {\r | |
367 | MemType = EFI_MEMORY_UC;\r | |
368 | } else {\r | |
369 | Status = EFI_UNSUPPORTED;\r | |
370 | goto FreeBuffer;\r | |
371 | }\r | |
372 | \r | |
373 | Alloc = AllocatePool (sizeof *Alloc);\r | |
374 | if (Alloc == NULL) {\r | |
375 | goto FreeBuffer;\r | |
376 | }\r | |
377 | \r | |
378 | Alloc->HostAddress = Allocation;\r | |
379 | Alloc->NumPages = Pages;\r | |
380 | Alloc->Attributes = GcdDescriptor.Attributes;\r | |
381 | \r | |
382 | InsertHeadList (&UncachedAllocationList, &Alloc->Link);\r | |
383 | \r | |
384 | // Remap the region with the new attributes\r | |
385 | Status = gDS->SetMemorySpaceAttributes ((PHYSICAL_ADDRESS)(UINTN)Allocation,\r | |
386 | EFI_PAGES_TO_SIZE (Pages),\r | |
387 | MemType);\r | |
388 | if (EFI_ERROR (Status)) {\r | |
389 | goto FreeAlloc;\r | |
390 | }\r | |
391 | \r | |
392 | Status = mCpu->FlushDataCache (mCpu,\r | |
393 | (PHYSICAL_ADDRESS)(UINTN)Allocation,\r | |
394 | EFI_PAGES_TO_SIZE (Pages),\r | |
395 | EfiCpuFlushTypeInvalidate);\r | |
396 | if (EFI_ERROR (Status)) {\r | |
397 | goto FreeAlloc;\r | |
398 | }\r | |
399 | \r | |
400 | *HostAddress = Allocation;\r | |
401 | \r | |
402 | return EFI_SUCCESS;\r | |
403 | \r | |
404 | FreeAlloc:\r | |
405 | RemoveEntryList (&Alloc->Link);\r | |
406 | FreePool (Alloc);\r | |
407 | \r | |
408 | FreeBuffer:\r | |
409 | FreePages (Allocation, Pages);\r | |
410 | return Status;\r | |
411 | }\r | |
412 | \r | |
413 | \r | |
414 | /**\r | |
415 | Frees memory that was allocated with DmaAllocateBuffer().\r | |
416 | \r | |
417 | @param Pages The number of pages to free.\r | |
418 | @param HostAddress The base system memory address of the allocated\r | |
419 | range.\r | |
420 | \r | |
421 | @retval EFI_SUCCESS The requested memory pages were freed.\r | |
422 | @retval EFI_INVALID_PARAMETER The memory range specified by HostAddress and\r | |
423 | Pages was not allocated with\r | |
424 | DmaAllocateBuffer().\r | |
425 | \r | |
426 | **/\r | |
427 | EFI_STATUS\r | |
428 | EFIAPI\r | |
429 | DmaFreeBuffer (\r | |
430 | IN UINTN Pages,\r | |
431 | IN VOID *HostAddress\r | |
432 | )\r | |
433 | {\r | |
434 | LIST_ENTRY *Link;\r | |
435 | UNCACHED_ALLOCATION *Alloc;\r | |
436 | BOOLEAN Found;\r | |
437 | EFI_STATUS Status;\r | |
438 | \r | |
439 | if (HostAddress == NULL) {\r | |
440 | return EFI_INVALID_PARAMETER;\r | |
441 | }\r | |
442 | \r | |
443 | for (Link = GetFirstNode (&UncachedAllocationList), Found = FALSE;\r | |
444 | !IsNull (&UncachedAllocationList, Link);\r | |
445 | Link = GetNextNode (&UncachedAllocationList, Link)) {\r | |
446 | \r | |
447 | Alloc = BASE_CR (Link, UNCACHED_ALLOCATION, Link);\r | |
448 | if (Alloc->HostAddress == HostAddress && Alloc->NumPages == Pages) {\r | |
449 | Found = TRUE;\r | |
450 | break;\r | |
451 | }\r | |
452 | }\r | |
453 | \r | |
454 | if (!Found) {\r | |
455 | ASSERT (FALSE);\r | |
456 | return EFI_INVALID_PARAMETER;\r | |
457 | }\r | |
458 | \r | |
459 | RemoveEntryList (&Alloc->Link);\r | |
460 | \r | |
461 | Status = gDS->SetMemorySpaceAttributes ((PHYSICAL_ADDRESS)(UINTN)HostAddress,\r | |
462 | EFI_PAGES_TO_SIZE (Pages),\r | |
463 | Alloc->Attributes);\r | |
464 | if (EFI_ERROR (Status)) {\r | |
465 | goto FreeAlloc;\r | |
466 | }\r | |
467 | \r | |
468 | //\r | |
469 | // If we fail to restore the original attributes, it is better to leak the\r | |
470 | // memory than to return it to the heap\r | |
471 | //\r | |
472 | FreePages (HostAddress, Pages);\r | |
473 | \r | |
474 | FreeAlloc:\r | |
475 | FreePool (Alloc);\r | |
476 | return Status;\r | |
477 | }\r | |
478 | \r | |
479 | \r | |
480 | EFI_STATUS\r | |
481 | EFIAPI\r | |
482 | NonCoherentDmaLibConstructor (\r | |
483 | IN EFI_HANDLE ImageHandle,\r | |
484 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
485 | )\r | |
486 | {\r | |
487 | InitializeListHead (&UncachedAllocationList);\r | |
488 | \r | |
489 | // Get the Cpu protocol for later use\r | |
490 | return gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&mCpu);\r | |
491 | }\r |