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1 | /** @file\r | |
2 | BlockIo implementation for Xen PV Block driver.\r | |
3 | \r | |
4 | This file is implementing the interface between the actual driver in\r | |
5 | BlockFront.c to the BlockIo protocol.\r | |
6 | \r | |
7 | Copyright (C) 2014, Citrix Ltd.\r | |
8 | \r | |
9 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
10 | \r | |
11 | **/\r | |
12 | \r | |
13 | #include "XenPvBlkDxe.h"\r | |
14 | \r | |
15 | #include "BlockFront.h"\r | |
16 | \r | |
17 | ///\r | |
18 | /// Block I/O Media structure\r | |
19 | ///\r | |
20 | GLOBAL_REMOVE_IF_UNREFERENCED\r | |
21 | EFI_BLOCK_IO_MEDIA gXenPvBlkDxeBlockIoMedia = {\r | |
22 | 0, // MediaId\r | |
23 | FALSE, // RemovableMedia\r | |
24 | FALSE, // MediaPresent\r | |
25 | FALSE, // LogicalPartition\r | |
26 | TRUE, // ReadOnly\r | |
27 | FALSE, // WriteCaching\r | |
28 | 512, // BlockSize\r | |
29 | 512, // IoAlign, BlockFront does not support less than 512 bits-aligned.\r | |
30 | 0, // LastBlock\r | |
31 | 0, // LowestAlignedLba\r | |
32 | 0, // LogicalBlocksPerPhysicalBlock\r | |
33 | 0 // OptimalTransferLengthGranularity\r | |
34 | };\r | |
35 | \r | |
36 | ///\r | |
37 | /// Block I/O Protocol instance\r | |
38 | ///\r | |
39 | GLOBAL_REMOVE_IF_UNREFERENCED\r | |
40 | EFI_BLOCK_IO_PROTOCOL gXenPvBlkDxeBlockIo = {\r | |
41 | EFI_BLOCK_IO_PROTOCOL_REVISION3, // Revision\r | |
42 | &gXenPvBlkDxeBlockIoMedia, // Media\r | |
43 | XenPvBlkDxeBlockIoReset, // Reset\r | |
44 | XenPvBlkDxeBlockIoReadBlocks, // ReadBlocks\r | |
45 | XenPvBlkDxeBlockIoWriteBlocks, // WriteBlocks\r | |
46 | XenPvBlkDxeBlockIoFlushBlocks // FlushBlocks\r | |
47 | };\r | |
48 | \r | |
49 | /**\r | |
50 | Read/Write BufferSize bytes from Lba into Buffer.\r | |
51 | \r | |
52 | This function is common to XenPvBlkDxeBlockIoReadBlocks and\r | |
53 | XenPvBlkDxeBlockIoWriteBlocks.\r | |
54 | \r | |
55 | @param This Indicates a pointer to the calling context.\r | |
56 | @param MediaId Id of the media, changes every time the media is replaced.\r | |
57 | @param Lba The starting Logical Block Address to read from/write to.\r | |
58 | @param BufferSize Size of Buffer, must be a multiple of device block size.\r | |
59 | @param Buffer A pointer to the destination/source buffer for the data.\r | |
60 | @param IsWrite Indicate if the operation is write or read.\r | |
61 | \r | |
62 | @return See description of XenPvBlkDxeBlockIoReadBlocks and\r | |
63 | XenPvBlkDxeBlockIoWriteBlocks.\r | |
64 | **/\r | |
65 | STATIC\r | |
66 | EFI_STATUS\r | |
67 | XenPvBlkDxeBlockIoReadWriteBlocks (\r | |
68 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
69 | IN UINT32 MediaId,\r | |
70 | IN EFI_LBA Lba,\r | |
71 | IN UINTN BufferSize,\r | |
72 | IN OUT VOID *Buffer,\r | |
73 | IN BOOLEAN IsWrite\r | |
74 | )\r | |
75 | {\r | |
76 | XEN_BLOCK_FRONT_IO IoData;\r | |
77 | EFI_BLOCK_IO_MEDIA *Media = This->Media;\r | |
78 | UINTN Sector;\r | |
79 | EFI_STATUS Status;\r | |
80 | \r | |
81 | if (Buffer == NULL) {\r | |
82 | return EFI_INVALID_PARAMETER;\r | |
83 | }\r | |
84 | \r | |
85 | if (BufferSize == 0) {\r | |
86 | return EFI_SUCCESS;\r | |
87 | }\r | |
88 | \r | |
89 | if (BufferSize % Media->BlockSize != 0) {\r | |
90 | DEBUG ((\r | |
91 | DEBUG_ERROR,\r | |
92 | "XenPvBlkDxe: Bad buffer size: 0x%Lx\n",\r | |
93 | (UINT64)BufferSize\r | |
94 | ));\r | |
95 | return EFI_BAD_BUFFER_SIZE;\r | |
96 | }\r | |
97 | \r | |
98 | if ((Lba > Media->LastBlock) ||\r | |
99 | ((BufferSize / Media->BlockSize) - 1 > Media->LastBlock - Lba))\r | |
100 | {\r | |
101 | DEBUG ((\r | |
102 | DEBUG_ERROR,\r | |
103 | "XenPvBlkDxe: %a with invalid LBA: 0x%Lx, size: 0x%Lx\n",\r | |
104 | IsWrite ? "Write" : "Read",\r | |
105 | Lba,\r | |
106 | (UINT64)BufferSize\r | |
107 | ));\r | |
108 | return EFI_INVALID_PARAMETER;\r | |
109 | }\r | |
110 | \r | |
111 | if (IsWrite && Media->ReadOnly) {\r | |
112 | return EFI_WRITE_PROTECTED;\r | |
113 | }\r | |
114 | \r | |
115 | if ((Media->IoAlign > 1) && (UINTN)Buffer & (Media->IoAlign - 1)) {\r | |
116 | //\r | |
117 | // Grub2 does not appear to respect IoAlign of 512, so reallocate the\r | |
118 | // buffer here.\r | |
119 | //\r | |
120 | VOID *NewBuffer;\r | |
121 | \r | |
122 | //\r | |
123 | // Try again with a properly aligned buffer.\r | |
124 | //\r | |
125 | NewBuffer = AllocateAlignedPages (\r | |
126 | (BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE,\r | |
127 | Media->IoAlign\r | |
128 | );\r | |
129 | if (!IsWrite) {\r | |
130 | Status = XenPvBlkDxeBlockIoReadBlocks (\r | |
131 | This,\r | |
132 | MediaId,\r | |
133 | Lba,\r | |
134 | BufferSize,\r | |
135 | NewBuffer\r | |
136 | );\r | |
137 | CopyMem (Buffer, NewBuffer, BufferSize);\r | |
138 | } else {\r | |
139 | CopyMem (NewBuffer, Buffer, BufferSize);\r | |
140 | Status = XenPvBlkDxeBlockIoWriteBlocks (\r | |
141 | This,\r | |
142 | MediaId,\r | |
143 | Lba,\r | |
144 | BufferSize,\r | |
145 | NewBuffer\r | |
146 | );\r | |
147 | }\r | |
148 | \r | |
149 | FreeAlignedPages (NewBuffer, (BufferSize + EFI_PAGE_SIZE) / EFI_PAGE_SIZE);\r | |
150 | return Status;\r | |
151 | }\r | |
152 | \r | |
153 | IoData.Dev = XEN_BLOCK_FRONT_FROM_BLOCK_IO (This);\r | |
154 | Sector = (UINTN)MultU64x32 (Lba, Media->BlockSize / 512);\r | |
155 | \r | |
156 | while (BufferSize > 0) {\r | |
157 | if (((UINTN)Buffer & EFI_PAGE_MASK) == 0) {\r | |
158 | IoData.Size = MIN (\r | |
159 | BLKIF_MAX_SEGMENTS_PER_REQUEST * EFI_PAGE_SIZE,\r | |
160 | BufferSize\r | |
161 | );\r | |
162 | } else {\r | |
163 | IoData.Size = MIN (\r | |
164 | (BLKIF_MAX_SEGMENTS_PER_REQUEST - 1) * EFI_PAGE_SIZE,\r | |
165 | BufferSize\r | |
166 | );\r | |
167 | }\r | |
168 | \r | |
169 | IoData.Buffer = Buffer;\r | |
170 | IoData.Sector = Sector;\r | |
171 | BufferSize -= IoData.Size;\r | |
172 | Buffer = (VOID *)((UINTN)Buffer + IoData.Size);\r | |
173 | Sector += IoData.Size / 512;\r | |
174 | Status = XenPvBlockIo (&IoData, IsWrite);\r | |
175 | if (EFI_ERROR (Status)) {\r | |
176 | DEBUG ((\r | |
177 | DEBUG_ERROR,\r | |
178 | "XenPvBlkDxe: Error during %a operation.\n",\r | |
179 | IsWrite ? "write" : "read"\r | |
180 | ));\r | |
181 | return Status;\r | |
182 | }\r | |
183 | }\r | |
184 | \r | |
185 | return EFI_SUCCESS;\r | |
186 | }\r | |
187 | \r | |
188 | /**\r | |
189 | Read BufferSize bytes from Lba into Buffer.\r | |
190 | \r | |
191 | @param This Indicates a pointer to the calling context.\r | |
192 | @param MediaId Id of the media, changes every time the media is replaced.\r | |
193 | @param Lba The starting Logical Block Address to read from\r | |
194 | @param BufferSize Size of Buffer, must be a multiple of device block size.\r | |
195 | @param Buffer A pointer to the destination buffer for the data. The caller is\r | |
196 | responsible for either having implicit or explicit ownership of the buffer.\r | |
197 | \r | |
198 | @retval EFI_SUCCESS The data was read correctly from the device.\r | |
199 | @retval EFI_DEVICE_ERROR The device reported an error while performing the read.\r | |
200 | @retval EFI_NO_MEDIA There is no media in the device.\r | |
201 | @retval EFI_MEDIA_CHANGED The MediaId does not match the current device.\r | |
202 | @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.\r | |
203 | @retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,\r | |
204 | or the buffer is not on proper alignment.\r | |
205 | \r | |
206 | **/\r | |
207 | EFI_STATUS\r | |
208 | EFIAPI\r | |
209 | XenPvBlkDxeBlockIoReadBlocks (\r | |
210 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
211 | IN UINT32 MediaId,\r | |
212 | IN EFI_LBA Lba,\r | |
213 | IN UINTN BufferSize,\r | |
214 | OUT VOID *Buffer\r | |
215 | )\r | |
216 | {\r | |
217 | return XenPvBlkDxeBlockIoReadWriteBlocks (\r | |
218 | This,\r | |
219 | MediaId,\r | |
220 | Lba,\r | |
221 | BufferSize,\r | |
222 | Buffer,\r | |
223 | FALSE\r | |
224 | );\r | |
225 | }\r | |
226 | \r | |
227 | /**\r | |
228 | Write BufferSize bytes from Lba into Buffer.\r | |
229 | \r | |
230 | @param This Indicates a pointer to the calling context.\r | |
231 | @param MediaId The media ID that the write request is for.\r | |
232 | @param Lba The starting logical block address to be written. The caller is\r | |
233 | responsible for writing to only legitimate locations.\r | |
234 | @param BufferSize Size of Buffer, must be a multiple of device block size.\r | |
235 | @param Buffer A pointer to the source buffer for the data.\r | |
236 | \r | |
237 | @retval EFI_SUCCESS The data was written correctly to the device.\r | |
238 | @retval EFI_WRITE_PROTECTED The device can not be written to.\r | |
239 | @retval EFI_DEVICE_ERROR The device reported an error while performing the write.\r | |
240 | @retval EFI_NO_MEDIA There is no media in the device.\r | |
241 | @retval EFI_MEDIA_CHANGED The MediaId does not match the current device.\r | |
242 | @retval EFI_BAD_BUFFER_SIZE The Buffer was not a multiple of the block size of the device.\r | |
243 | @retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,\r | |
244 | or the buffer is not on proper alignment.\r | |
245 | \r | |
246 | **/\r | |
247 | EFI_STATUS\r | |
248 | EFIAPI\r | |
249 | XenPvBlkDxeBlockIoWriteBlocks (\r | |
250 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
251 | IN UINT32 MediaId,\r | |
252 | IN EFI_LBA Lba,\r | |
253 | IN UINTN BufferSize,\r | |
254 | IN VOID *Buffer\r | |
255 | )\r | |
256 | {\r | |
257 | return XenPvBlkDxeBlockIoReadWriteBlocks (\r | |
258 | This,\r | |
259 | MediaId,\r | |
260 | Lba,\r | |
261 | BufferSize,\r | |
262 | Buffer,\r | |
263 | TRUE\r | |
264 | );\r | |
265 | }\r | |
266 | \r | |
267 | /**\r | |
268 | Flush the Block Device.\r | |
269 | \r | |
270 | @param This Indicates a pointer to the calling context.\r | |
271 | \r | |
272 | @retval EFI_SUCCESS All outstanding data was written to the device\r | |
273 | @retval EFI_DEVICE_ERROR The device reported an error while writing back the data\r | |
274 | @retval EFI_NO_MEDIA There is no media in the device.\r | |
275 | \r | |
276 | **/\r | |
277 | EFI_STATUS\r | |
278 | EFIAPI\r | |
279 | XenPvBlkDxeBlockIoFlushBlocks (\r | |
280 | IN EFI_BLOCK_IO_PROTOCOL *This\r | |
281 | )\r | |
282 | {\r | |
283 | XenPvBlockSync (XEN_BLOCK_FRONT_FROM_BLOCK_IO (This));\r | |
284 | return EFI_SUCCESS;\r | |
285 | }\r | |
286 | \r | |
287 | /**\r | |
288 | Reset the block device hardware.\r | |
289 | \r | |
290 | @param[in] This Indicates a pointer to the calling context.\r | |
291 | @param[in] ExtendedVerification Not used.\r | |
292 | \r | |
293 | @retval EFI_SUCCESS The device was reset.\r | |
294 | \r | |
295 | **/\r | |
296 | EFI_STATUS\r | |
297 | EFIAPI\r | |
298 | XenPvBlkDxeBlockIoReset (\r | |
299 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
300 | IN BOOLEAN ExtendedVerification\r | |
301 | )\r | |
302 | {\r | |
303 | //\r | |
304 | // Since the initialization of the devices is done, then the device is\r | |
305 | // working correctly.\r | |
306 | //\r | |
307 | return EFI_SUCCESS;\r | |
308 | }\r |