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fd51d759 | 1 | /** @file\r |
2 | \r | |
3 | This driver produces Block I/O Protocol instances for virtio-blk devices.\r | |
4 | \r | |
5 | The implementation is basic:\r | |
6 | \r | |
7 | - No attach/detach (ie. removable media).\r | |
8 | \r | |
9 | - Although the non-blocking interfaces of EFI_BLOCK_IO2_PROTOCOL could be a\r | |
10 | good match for multiple in-flight virtio-blk requests, we stick to\r | |
11 | synchronous requests and EFI_BLOCK_IO_PROTOCOL for now.\r | |
12 | \r | |
13 | Copyright (C) 2012, Red Hat, Inc.\r | |
14 | \r | |
15 | This program and the accompanying materials are licensed and made available\r | |
16 | under the terms and conditions of the BSD License which accompanies this\r | |
17 | distribution. The full text of the license may be found at\r | |
18 | http://opensource.org/licenses/bsd-license.php\r | |
19 | \r | |
20 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
21 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
22 | \r | |
23 | **/\r | |
24 | \r | |
25 | #include <IndustryStandard/Pci.h>\r | |
26 | #include <Library/BaseMemoryLib.h>\r | |
27 | #include <Library/DebugLib.h>\r | |
28 | #include <Library/MemoryAllocationLib.h>\r | |
29 | #include <Library/UefiBootServicesTableLib.h>\r | |
30 | #include <Library/UefiLib.h>\r | |
31 | \r | |
32 | #include "VirtioBlk.h"\r | |
33 | \r | |
34 | /**\r | |
35 | \r | |
36 | Write a word into Region 0 of the device specified by PciIo.\r | |
37 | \r | |
38 | Region 0 must be an iomem region. This is an internal function for the\r | |
39 | VIRTIO_CFG_WRITE() macro below.\r | |
40 | \r | |
41 | @param[in] PciIo Target PCI device.\r | |
42 | \r | |
43 | @param[in] FieldOffset Destination offset.\r | |
44 | \r | |
45 | @param[in] FieldSize Destination field size, must be in { 1, 2, 4, 8 }.\r | |
46 | \r | |
47 | @param[in] Value Little endian value to write, converted to UINT64.\r | |
48 | The least significant FieldSize bytes will be used.\r | |
49 | \r | |
50 | \r | |
51 | @return Status code returned by PciIo->Io.Write().\r | |
52 | \r | |
53 | **/\r | |
54 | STATIC\r | |
55 | EFIAPI\r | |
56 | EFI_STATUS\r | |
57 | VirtioWrite (\r | |
58 | IN EFI_PCI_IO_PROTOCOL *PciIo,\r | |
59 | IN UINTN FieldOffset,\r | |
60 | IN UINTN FieldSize,\r | |
61 | IN UINT64 Value\r | |
62 | )\r | |
63 | {\r | |
64 | UINTN Count;\r | |
65 | EFI_PCI_IO_PROTOCOL_WIDTH Width;\r | |
66 | \r | |
67 | Count = 1;\r | |
68 | switch (FieldSize) {\r | |
69 | case 1:\r | |
70 | Width = EfiPciIoWidthUint8;\r | |
71 | break;\r | |
72 | \r | |
73 | case 2:\r | |
74 | Width = EfiPciIoWidthUint16;\r | |
75 | break;\r | |
76 | \r | |
77 | case 8:\r | |
78 | Count = 2;\r | |
79 | // fall through\r | |
80 | \r | |
81 | case 4:\r | |
82 | Width = EfiPciIoWidthUint32;\r | |
83 | break;\r | |
84 | \r | |
85 | default:\r | |
86 | ASSERT (FALSE);\r | |
87 | }\r | |
88 | \r | |
89 | return PciIo->Io.Write (\r | |
90 | PciIo,\r | |
91 | Width,\r | |
92 | PCI_BAR_IDX0,\r | |
93 | FieldOffset,\r | |
94 | Count,\r | |
95 | &Value\r | |
96 | );\r | |
97 | }\r | |
98 | \r | |
99 | \r | |
100 | /**\r | |
101 | \r | |
102 | Read a word from Region 0 of the device specified by PciIo.\r | |
103 | \r | |
104 | Region 0 must be an iomem region. This is an internal function for the\r | |
105 | VIRTIO_CFG_READ() macro below.\r | |
106 | \r | |
107 | @param[in] PciIo Source PCI device.\r | |
108 | \r | |
109 | @param[in] FieldOffset Source offset.\r | |
110 | \r | |
111 | @param[in] FieldSize Source field size, must be in { 1, 2, 4, 8 }.\r | |
112 | \r | |
113 | @param[in] BufferSize Number of bytes available in the target buffer. Must\r | |
114 | equal FieldSize.\r | |
115 | \r | |
116 | @param[out] Buffer Target buffer.\r | |
117 | \r | |
118 | \r | |
119 | @return Status code returned by PciIo->Io.Read().\r | |
120 | \r | |
121 | **/\r | |
122 | STATIC\r | |
123 | EFIAPI\r | |
124 | EFI_STATUS\r | |
125 | VirtioRead (\r | |
126 | IN EFI_PCI_IO_PROTOCOL *PciIo,\r | |
127 | IN UINTN FieldOffset,\r | |
128 | IN UINTN FieldSize,\r | |
129 | IN UINTN BufferSize,\r | |
130 | OUT VOID *Buffer\r | |
131 | )\r | |
132 | {\r | |
133 | UINTN Count;\r | |
134 | EFI_PCI_IO_PROTOCOL_WIDTH Width;\r | |
135 | \r | |
136 | ASSERT (FieldSize == BufferSize);\r | |
137 | \r | |
138 | Count = 1;\r | |
139 | switch (FieldSize) {\r | |
140 | case 1:\r | |
141 | Width = EfiPciIoWidthUint8;\r | |
142 | break;\r | |
143 | \r | |
144 | case 2:\r | |
145 | Width = EfiPciIoWidthUint16;\r | |
146 | break;\r | |
147 | \r | |
148 | case 8:\r | |
149 | Count = 2;\r | |
150 | // fall through\r | |
151 | \r | |
152 | case 4:\r | |
153 | Width = EfiPciIoWidthUint32;\r | |
154 | break;\r | |
155 | \r | |
156 | default:\r | |
157 | ASSERT (FALSE);\r | |
158 | }\r | |
159 | \r | |
160 | return PciIo->Io.Read (\r | |
161 | PciIo,\r | |
162 | Width,\r | |
163 | PCI_BAR_IDX0,\r | |
164 | FieldOffset,\r | |
165 | Count,\r | |
166 | Buffer\r | |
167 | );\r | |
168 | }\r | |
169 | \r | |
170 | \r | |
171 | /**\r | |
172 | \r | |
173 | Convenience macros to read and write region 0 IO space elements of the\r | |
174 | virtio-blk PCI device, for configuration purposes.\r | |
175 | \r | |
176 | The following macros make it possible to specify only the "core parameters"\r | |
177 | for such accesses and to derive the rest. By the time VIRTIO_CFG_WRITE()\r | |
178 | returns, the transaction will have been completed.\r | |
179 | \r | |
180 | @param[in] Dev Pointer to the VBLK_DEV structure whose PCI IO space\r | |
181 | we're accessing. Dev->PciIo must be valid.\r | |
182 | \r | |
183 | @param[in] Field A field name from VBLK_HDR, identifying the virtio-blk\r | |
184 | configuration item to access.\r | |
185 | \r | |
186 | @param[in] Value (VIRTIO_CFG_WRITE() only.) The value to write to the\r | |
187 | selected configuration item.\r | |
188 | \r | |
189 | @param[out] Pointer (VIRTIO_CFG_READ() only.) The object to receive the\r | |
190 | value read from the configuration item. Its type must be\r | |
191 | one of UINT8, UINT16, UINT32, UINT64.\r | |
192 | \r | |
193 | \r | |
194 | @return Status code returned by VirtioWrite() / VirtioRead().\r | |
195 | \r | |
196 | **/\r | |
197 | \r | |
198 | #define VIRTIO_CFG_WRITE(Dev, Field, Value) (VirtioWrite ( \\r | |
199 | (Dev)->PciIo, \\r | |
200 | OFFSET_OF_VHDR (Field), \\r | |
201 | SIZE_OF_VHDR (Field), \\r | |
202 | (Value) \\r | |
203 | ))\r | |
204 | \r | |
205 | #define VIRTIO_CFG_READ(Dev, Field, Pointer) (VirtioRead ( \\r | |
206 | (Dev)->PciIo, \\r | |
207 | OFFSET_OF_VHDR (Field), \\r | |
208 | SIZE_OF_VHDR (Field), \\r | |
209 | sizeof *(Pointer), \\r | |
210 | (Pointer) \\r | |
211 | ))\r | |
212 | \r | |
213 | \r | |
214 | //\r | |
215 | // UEFI Spec 2.3.1 + Errata C, 12.8 EFI Block I/O Protocol\r | |
216 | // Driver Writer's Guide for UEFI 2.3.1 v1.01,\r | |
217 | // 24.2 Block I/O Protocol Implementations\r | |
218 | //\r | |
219 | EFI_STATUS\r | |
220 | EFIAPI\r | |
221 | VirtioBlkReset (\r | |
222 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
223 | IN BOOLEAN ExtendedVerification\r | |
224 | )\r | |
225 | {\r | |
226 | //\r | |
227 | // If we managed to initialize and install the driver, then the device is\r | |
228 | // working correctly.\r | |
229 | //\r | |
230 | return EFI_SUCCESS;\r | |
231 | }\r | |
232 | \r | |
233 | /**\r | |
234 | \r | |
235 | Verify correctness of the read/write (not flush) request submitted to the\r | |
236 | EFI_BLOCK_IO_PROTOCOL instance.\r | |
237 | \r | |
238 | This function provides most verification steps described in:\r | |
239 | \r | |
240 | UEFI Spec 2.3.1 + Errata C, 12.8 EFI Block I/O Protocol, 12.8 EFI Block I/O\r | |
241 | Protocol,\r | |
242 | - EFI_BLOCK_IO_PROTOCOL.ReadBlocks()\r | |
243 | - EFI_BLOCK_IO_PROTOCOL.WriteBlocks()\r | |
244 | \r | |
245 | Driver Writer's Guide for UEFI 2.3.1 v1.01,\r | |
246 | - 24.2.2. ReadBlocks() and ReadBlocksEx() Implementation\r | |
247 | - 24.2.3 WriteBlocks() and WriteBlockEx() Implementation\r | |
248 | \r | |
249 | Request sizes are limited to 1 GB (checked). This is not a practical\r | |
250 | limitation, just conformance to virtio-0.9.5, 2.3.2 Descriptor Table: "no\r | |
251 | descriptor chain may be more than 2^32 bytes long in total".\r | |
252 | \r | |
253 | Some Media characteristics are hardcoded in VirtioBlkInit() below (like\r | |
254 | non-removable media, no restriction on buffer alignment etc); we rely on\r | |
255 | those here without explicit mention.\r | |
256 | \r | |
257 | @param[in] Media The EFI_BLOCK_IO_MEDIA characteristics for\r | |
258 | this driver instance, extracted from the\r | |
259 | underlying virtio-blk device at initialization\r | |
260 | time. We validate the request against this set\r | |
261 | of attributes.\r | |
262 | \r | |
263 | \r | |
264 | @param[in] Lba Logical Block Address: number of logical\r | |
265 | blocks to skip from the beginning of the\r | |
266 | device.\r | |
267 | \r | |
268 | @param[in] PositiveBufferSize Size of buffer to transfer, in bytes. The\r | |
269 | caller is responsible to ensure this parameter\r | |
270 | is positive.\r | |
271 | \r | |
272 | @param[in] RequestIsWrite TRUE iff data transfer goes from guest to\r | |
273 | device.\r | |
274 | \r | |
275 | \r | |
276 | @@return Validation result to be forwarded outwards by\r | |
277 | ReadBlocks() and WriteBlocks, as required by\r | |
278 | the specs above.\r | |
279 | \r | |
280 | **/\r | |
281 | STATIC\r | |
282 | EFI_STATUS\r | |
283 | EFIAPI\r | |
284 | VerifyReadWriteRequest (\r | |
285 | IN EFI_BLOCK_IO_MEDIA *Media,\r | |
286 | IN EFI_LBA Lba,\r | |
287 | IN UINTN PositiveBufferSize,\r | |
288 | IN BOOLEAN RequestIsWrite\r | |
289 | )\r | |
290 | {\r | |
291 | UINTN BlockCount;\r | |
292 | \r | |
293 | ASSERT (PositiveBufferSize > 0);\r | |
294 | \r | |
295 | if (PositiveBufferSize > SIZE_1GB ||\r | |
296 | PositiveBufferSize % Media->BlockSize > 0) {\r | |
297 | return EFI_BAD_BUFFER_SIZE;\r | |
298 | }\r | |
299 | BlockCount = PositiveBufferSize / Media->BlockSize;\r | |
300 | \r | |
301 | //\r | |
302 | // Avoid unsigned wraparound on either side in the second comparison.\r | |
303 | //\r | |
304 | if (Lba > Media->LastBlock || BlockCount - 1 > Media->LastBlock - Lba) {\r | |
305 | return EFI_INVALID_PARAMETER;\r | |
306 | }\r | |
307 | \r | |
308 | if (RequestIsWrite && Media->ReadOnly) {\r | |
309 | return EFI_WRITE_PROTECTED;\r | |
310 | }\r | |
311 | \r | |
312 | return EFI_SUCCESS;\r | |
313 | }\r | |
314 | \r | |
315 | \r | |
316 | /**\r | |
317 | \r | |
318 | Append a contiguous buffer for transmission / reception via the virtio ring.\r | |
319 | \r | |
320 | This function implements the following sections from virtio-0.9.5:\r | |
321 | - 2.4.1.1 Placing Buffers into the Descriptor Table\r | |
322 | - 2.4.1.2 Updating the Available Ring\r | |
323 | \r | |
324 | Free space is taken as granted, since this driver supports only synchronous\r | |
325 | requests and host side status is processed in lock-step with request\r | |
326 | submission. VirtioBlkInit() verifies the ring size in advance.\r | |
327 | \r | |
328 | @param[in out] Ring The virtio ring to append the buffer to, as a\r | |
329 | descriptor.\r | |
330 | \r | |
331 | @param [in] BufferPhysAddr (Guest pseudo-physical) start address of the\r | |
332 | transmit / receive buffer\r | |
333 | \r | |
334 | @param [in] BufferSize Number of bytes to transmit or receive.\r | |
335 | \r | |
336 | @param [in] Flags A bitmask of VRING_DESC_F_* flags. The caller\r | |
337 | computes this mask dependent on further buffers\r | |
338 | to append and transfer direction.\r | |
339 | VRING_DESC_F_INDIRECT is unsupported. The\r | |
340 | VRING_DESC.Next field is always set, but the\r | |
341 | host only interprets it dependent on\r | |
342 | VRING_DESC_F_NEXT.\r | |
343 | \r | |
344 | @param [in] HeadIdx The index identifying the head buffer (first\r | |
345 | buffer appended) belonging to this same\r | |
346 | request.\r | |
347 | \r | |
348 | @param [in out] NextAvailIdx On input, the index identifying the next\r | |
349 | descriptor available to carry the buffer. On\r | |
350 | output, incremented by one, modulo 2^16.\r | |
351 | \r | |
352 | **/\r | |
353 | \r | |
354 | STATIC\r | |
355 | VOID\r | |
356 | EFIAPI\r | |
357 | AppendDesc (\r | |
358 | IN OUT VRING *Ring,\r | |
359 | IN UINTN BufferPhysAddr,\r | |
360 | IN UINT32 BufferSize,\r | |
361 | IN UINT16 Flags,\r | |
362 | IN UINT16 HeadIdx,\r | |
363 | IN OUT UINT16 *NextAvailIdx\r | |
364 | )\r | |
365 | {\r | |
366 | volatile VRING_DESC *Desc;\r | |
367 | \r | |
368 | Desc = &Ring->Desc[*NextAvailIdx % Ring->QueueSize];\r | |
369 | Desc->Addr = BufferPhysAddr;\r | |
370 | Desc->Len = BufferSize;\r | |
371 | Desc->Flags = Flags;\r | |
372 | Ring->Avail.Ring[(*NextAvailIdx)++ % Ring->QueueSize] =\r | |
373 | HeadIdx % Ring->QueueSize;\r | |
374 | Desc->Next = *NextAvailIdx % Ring->QueueSize;\r | |
375 | }\r | |
376 | \r | |
377 | \r | |
378 | /**\r | |
379 | \r | |
380 | Format a read / write / flush request as three consecutive virtio\r | |
381 | descriptors, push them to the host, and poll for the response.\r | |
382 | \r | |
383 | This is the main workhorse function. Two use cases are supported, read/write\r | |
384 | and flush. The function may only be called after the request parameters have\r | |
385 | been verified by\r | |
386 | - specific checks in ReadBlocks() / WriteBlocks() / FlushBlocks(), and\r | |
387 | - VerifyReadWriteRequest() (for read/write only).\r | |
388 | \r | |
389 | Parameters handled commonly:\r | |
390 | \r | |
391 | @param[in] Dev The virtio-blk device the request is targeted\r | |
392 | at.\r | |
393 | \r | |
394 | Flush request:\r | |
395 | \r | |
396 | @param[in] Lba Must be zero.\r | |
397 | \r | |
398 | @param[in] BufferSize Must be zero.\r | |
399 | \r | |
400 | @param[in out] Buffer Ignored by the function.\r | |
401 | \r | |
402 | @param[in] RequestIsWrite Must be TRUE.\r | |
403 | \r | |
404 | Read/Write request:\r | |
405 | \r | |
406 | @param[in] Lba Logical Block Address: number of logical blocks\r | |
407 | to skip from the beginning of the device.\r | |
408 | \r | |
409 | @param[in] BufferSize Size of buffer to transfer, in bytes. The caller\r | |
410 | is responsible to ensure this parameter is\r | |
411 | positive.\r | |
412 | \r | |
413 | @param[in out] Buffer The guest side area to read data from the device\r | |
414 | into, or write data to the device from.\r | |
415 | \r | |
416 | @param[in] RequestIsWrite TRUE iff data transfer goes from guest to\r | |
417 | device.\r | |
418 | \r | |
419 | Return values are common to both use cases, and are appropriate to be\r | |
420 | forwarded by the EFI_BLOCK_IO_PROTOCOL functions (ReadBlocks(),\r | |
421 | WriteBlocks(), FlushBlocks()).\r | |
422 | \r | |
423 | \r | |
424 | @retval EFI_SUCCESS Transfer complete.\r | |
425 | \r | |
426 | @retval EFI_DEVICE_ERROR Failed to notify host side via PCI write, or\r | |
427 | unable to parse host response, or host response\r | |
428 | is not VIRTIO_BLK_S_OK.\r | |
429 | \r | |
430 | **/\r | |
431 | \r | |
432 | STATIC\r | |
433 | EFI_STATUS\r | |
434 | EFIAPI\r | |
435 | SynchronousRequest (\r | |
436 | IN VBLK_DEV *Dev,\r | |
437 | IN EFI_LBA Lba,\r | |
438 | IN UINTN BufferSize,\r | |
439 | IN OUT volatile VOID *Buffer,\r | |
440 | IN BOOLEAN RequestIsWrite\r | |
441 | )\r | |
442 | {\r | |
443 | UINT32 BlockSize;\r | |
444 | volatile VIRTIO_BLK_REQ Request;\r | |
445 | volatile UINT8 HostStatus;\r | |
446 | UINT16 FirstAvailIdx;\r | |
447 | UINT16 NextAvailIdx;\r | |
448 | UINTN PollPeriodUsecs;\r | |
449 | \r | |
450 | BlockSize = Dev->BlockIoMedia.BlockSize;\r | |
451 | \r | |
452 | //\r | |
453 | // ensured by VirtioBlkInit()\r | |
454 | //\r | |
455 | ASSERT (BlockSize > 0);\r | |
456 | ASSERT (BlockSize % 512 == 0);\r | |
457 | \r | |
458 | //\r | |
459 | // ensured by contract above, plus VerifyReadWriteRequest()\r | |
460 | //\r | |
461 | ASSERT (BufferSize % BlockSize == 0);\r | |
462 | \r | |
463 | //\r | |
464 | // Prepare virtio-blk request header, setting zero size for flush.\r | |
465 | // IO Priority is homogeneously 0.\r | |
466 | //\r | |
467 | Request.Type = RequestIsWrite ?\r | |
468 | (BufferSize == 0 ? VIRTIO_BLK_T_FLUSH : VIRTIO_BLK_T_OUT) :\r | |
469 | VIRTIO_BLK_T_IN;\r | |
470 | Request.IoPrio = 0;\r | |
471 | Request.Sector = Lba * (BlockSize / 512);\r | |
472 | \r | |
473 | //\r | |
474 | // Prepare for virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device.\r | |
475 | // We're going to poll the answer, the host should not send an interrupt.\r | |
476 | //\r | |
477 | *Dev->Ring.Avail.Flags = (UINT16) VRING_AVAIL_F_NO_INTERRUPT;\r | |
478 | \r | |
479 | //\r | |
480 | // preset a host status for ourselves that we do not accept as success\r | |
481 | //\r | |
482 | HostStatus = VIRTIO_BLK_S_IOERR;\r | |
483 | \r | |
484 | //\r | |
485 | // ensured by VirtioBlkInit() -- this predicate, in combination with the\r | |
486 | // lock-step progress, ensures we don't have to track free descriptors.\r | |
487 | //\r | |
488 | ASSERT (Dev->Ring.QueueSize >= 3);\r | |
489 | \r | |
490 | //\r | |
491 | // Implement virtio-0.9.5, 2.4.1 Supplying Buffers to the Device.\r | |
492 | //\r | |
493 | FirstAvailIdx = *Dev->Ring.Avail.Idx;\r | |
494 | NextAvailIdx = FirstAvailIdx;\r | |
495 | \r | |
496 | //\r | |
497 | // virtio-blk header in first desc\r | |
498 | //\r | |
499 | AppendDesc (&Dev->Ring, (UINTN) &Request, sizeof Request, VRING_DESC_F_NEXT,\r | |
500 | FirstAvailIdx, &NextAvailIdx);\r | |
501 | \r | |
502 | //\r | |
503 | // data buffer for read/write in second desc\r | |
504 | //\r | |
505 | if (BufferSize > 0) {\r | |
506 | //\r | |
507 | // From virtio-0.9.5, 2.3.2 Descriptor Table:\r | |
508 | // "no descriptor chain may be more than 2^32 bytes long in total".\r | |
509 | //\r | |
510 | // The predicate is ensured by the call contract above (for flush), or\r | |
511 | // VerifyReadWriteRequest() (for read/write). It also implies that\r | |
512 | // converting BufferSize to UINT32 will not truncate it.\r | |
513 | //\r | |
514 | ASSERT (BufferSize <= SIZE_1GB);\r | |
515 | \r | |
516 | //\r | |
517 | // VRING_DESC_F_WRITE is interpreted from the host's point of view.\r | |
518 | //\r | |
519 | AppendDesc (&Dev->Ring, (UINTN) Buffer, (UINT32) BufferSize,\r | |
520 | VRING_DESC_F_NEXT | (RequestIsWrite ? 0 : VRING_DESC_F_WRITE),\r | |
521 | FirstAvailIdx, &NextAvailIdx);\r | |
522 | }\r | |
523 | \r | |
524 | //\r | |
525 | // host status in last (second or third) desc\r | |
526 | //\r | |
527 | AppendDesc (&Dev->Ring, (UINTN) &HostStatus, sizeof HostStatus,\r | |
528 | VRING_DESC_F_WRITE, FirstAvailIdx, &NextAvailIdx);\r | |
529 | \r | |
530 | //\r | |
531 | // virtio-0.9.5, 2.4.1.3 Updating the Index Field\r | |
532 | //\r | |
533 | MemoryFence();\r | |
534 | *Dev->Ring.Avail.Idx = NextAvailIdx;\r | |
535 | \r | |
536 | //\r | |
537 | // virtio-0.9.5, 2.4.1.4 Notifying the Device -- gratuitous notifications are\r | |
538 | // OK. virtio-blk's only virtqueue is #0, called "requestq" (see Appendix D).\r | |
539 | //\r | |
540 | MemoryFence();\r | |
541 | if (EFI_ERROR (VIRTIO_CFG_WRITE (Dev, VhdrQueueNotify, 0))) {\r | |
542 | return EFI_DEVICE_ERROR;\r | |
543 | }\r | |
544 | \r | |
545 | //\r | |
546 | // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device\r | |
547 | // Wait until the host processes and acknowledges our 3-part descriptor\r | |
548 | // chain. The condition we use for polling is greatly simplified and relies\r | |
549 | // on synchronous, the lock-step progress.\r | |
550 | //\r | |
551 | // Keep slowing down until we reach a poll period of slightly above 1 ms.\r | |
552 | //\r | |
553 | PollPeriodUsecs = 1;\r | |
554 | MemoryFence();\r | |
555 | while (*Dev->Ring.Used.Idx != NextAvailIdx) {\r | |
556 | gBS->Stall (PollPeriodUsecs); // calls AcpiTimerLib::MicroSecondDelay\r | |
557 | \r | |
558 | if (PollPeriodUsecs < 1024) {\r | |
559 | PollPeriodUsecs *= 2;\r | |
560 | }\r | |
561 | MemoryFence();\r | |
562 | }\r | |
563 | \r | |
564 | if (HostStatus == VIRTIO_BLK_S_OK) {\r | |
565 | return EFI_SUCCESS;\r | |
566 | }\r | |
567 | \r | |
568 | return EFI_DEVICE_ERROR;\r | |
569 | }\r | |
570 | \r | |
571 | \r | |
572 | /**\r | |
573 | \r | |
574 | ReadBlocks() operation for virtio-blk.\r | |
575 | \r | |
576 | See\r | |
577 | - UEFI Spec 2.3.1 + Errata C, 12.8 EFI Block I/O Protocol, 12.8 EFI Block I/O\r | |
578 | Protocol, EFI_BLOCK_IO_PROTOCOL.ReadBlocks().\r | |
579 | - Driver Writer's Guide for UEFI 2.3.1 v1.01, 24.2.2. ReadBlocks() and\r | |
580 | ReadBlocksEx() Implementation.\r | |
581 | \r | |
582 | Parameter checks and conformant return values are implemented in\r | |
583 | VerifyReadWriteRequest() and SynchronousRequest().\r | |
584 | \r | |
585 | A zero BufferSize doesn't seem to be prohibited, so do nothing in that case,\r | |
586 | successfully.\r | |
587 | \r | |
588 | **/\r | |
589 | \r | |
590 | EFI_STATUS\r | |
591 | EFIAPI\r | |
592 | VirtioBlkReadBlocks (\r | |
593 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
594 | IN UINT32 MediaId,\r | |
595 | IN EFI_LBA Lba,\r | |
596 | IN UINTN BufferSize,\r | |
597 | OUT VOID *Buffer\r | |
598 | )\r | |
599 | {\r | |
600 | VBLK_DEV *Dev;\r | |
601 | EFI_STATUS Status;\r | |
602 | \r | |
603 | if (BufferSize == 0) {\r | |
604 | return EFI_SUCCESS;\r | |
605 | }\r | |
606 | \r | |
607 | Dev = VIRTIO_BLK_FROM_BLOCK_IO (This);\r | |
608 | Status = VerifyReadWriteRequest (\r | |
609 | &Dev->BlockIoMedia,\r | |
610 | Lba,\r | |
611 | BufferSize,\r | |
612 | FALSE // RequestIsWrite\r | |
613 | );\r | |
614 | if (EFI_ERROR (Status)) {\r | |
615 | return Status;\r | |
616 | }\r | |
617 | \r | |
618 | return SynchronousRequest (\r | |
619 | Dev,\r | |
620 | Lba,\r | |
621 | BufferSize,\r | |
622 | Buffer,\r | |
623 | FALSE // RequestIsWrite\r | |
624 | );\r | |
625 | }\r | |
626 | \r | |
627 | /**\r | |
628 | \r | |
629 | WriteBlocks() operation for virtio-blk.\r | |
630 | \r | |
631 | See\r | |
632 | - UEFI Spec 2.3.1 + Errata C, 12.8 EFI Block I/O Protocol, 12.8 EFI Block I/O\r | |
633 | Protocol, EFI_BLOCK_IO_PROTOCOL.WriteBlocks().\r | |
634 | - Driver Writer's Guide for UEFI 2.3.1 v1.01, 24.2.3 WriteBlocks() and\r | |
635 | WriteBlockEx() Implementation.\r | |
636 | \r | |
637 | Parameter checks and conformant return values are implemented in\r | |
638 | VerifyReadWriteRequest() and SynchronousRequest().\r | |
639 | \r | |
640 | A zero BufferSize doesn't seem to be prohibited, so do nothing in that case,\r | |
641 | successfully.\r | |
642 | \r | |
643 | **/\r | |
644 | \r | |
645 | EFI_STATUS\r | |
646 | EFIAPI\r | |
647 | VirtioBlkWriteBlocks (\r | |
648 | IN EFI_BLOCK_IO_PROTOCOL *This,\r | |
649 | IN UINT32 MediaId,\r | |
650 | IN EFI_LBA Lba,\r | |
651 | IN UINTN BufferSize,\r | |
652 | IN VOID *Buffer\r | |
653 | )\r | |
654 | {\r | |
655 | VBLK_DEV *Dev;\r | |
656 | EFI_STATUS Status;\r | |
657 | \r | |
658 | if (BufferSize == 0) {\r | |
659 | return EFI_SUCCESS;\r | |
660 | }\r | |
661 | \r | |
662 | Dev = VIRTIO_BLK_FROM_BLOCK_IO (This);\r | |
663 | Status = VerifyReadWriteRequest (\r | |
664 | &Dev->BlockIoMedia,\r | |
665 | Lba,\r | |
666 | BufferSize,\r | |
667 | TRUE // RequestIsWrite\r | |
668 | );\r | |
669 | if (EFI_ERROR (Status)) {\r | |
670 | return Status;\r | |
671 | }\r | |
672 | \r | |
673 | return SynchronousRequest (\r | |
674 | Dev,\r | |
675 | Lba,\r | |
676 | BufferSize,\r | |
677 | Buffer,\r | |
678 | TRUE // RequestIsWrite\r | |
679 | );\r | |
680 | }\r | |
681 | \r | |
682 | \r | |
683 | /**\r | |
684 | \r | |
685 | FlushBlocks() operation for virtio-blk.\r | |
686 | \r | |
687 | See\r | |
688 | - UEFI Spec 2.3.1 + Errata C, 12.8 EFI Block I/O Protocol, 12.8 EFI Block I/O\r | |
689 | Protocol, EFI_BLOCK_IO_PROTOCOL.FlushBlocks().\r | |
690 | - Driver Writer's Guide for UEFI 2.3.1 v1.01, 24.2.4 FlushBlocks() and\r | |
691 | FlushBlocksEx() Implementation.\r | |
692 | \r | |
693 | If the underlying virtio-blk device doesn't support flushing (ie.\r | |
694 | write-caching), then this function should not be called by higher layers,\r | |
695 | according to EFI_BLOCK_IO_MEDIA characteristics set in VirtioBlkInit().\r | |
696 | Should they do nonetheless, we do nothing, successfully.\r | |
697 | \r | |
698 | **/\r | |
699 | \r | |
700 | EFI_STATUS\r | |
701 | EFIAPI\r | |
702 | VirtioBlkFlushBlocks (\r | |
703 | IN EFI_BLOCK_IO_PROTOCOL *This\r | |
704 | )\r | |
705 | {\r | |
706 | VBLK_DEV *Dev;\r | |
707 | \r | |
708 | Dev = VIRTIO_BLK_FROM_BLOCK_IO (This);\r | |
709 | return Dev->BlockIoMedia.WriteCaching ?\r | |
710 | SynchronousRequest (\r | |
711 | Dev,\r | |
712 | 0, // Lba\r | |
713 | 0, // BufferSize\r | |
714 | NULL, // Buffer\r | |
715 | TRUE // RequestIsWrite\r | |
716 | ) :\r | |
717 | EFI_SUCCESS;\r | |
718 | }\r | |
719 | \r | |
720 | \r | |
721 | /**\r | |
722 | \r | |
723 | Device probe function for this driver.\r | |
724 | \r | |
725 | The DXE core calls this function for any given device in order to see if the\r | |
726 | driver can drive the device.\r | |
727 | \r | |
728 | Specs relevant in the general sense:\r | |
729 | \r | |
730 | - UEFI Spec 2.3.1 + Errata C:\r | |
731 | - 6.3 Protocol Handler Services -- for accessing the underlying device\r | |
732 | - 10.1 EFI Driver Binding Protocol -- for exporting ourselves\r | |
733 | \r | |
734 | - Driver Writer's Guide for UEFI 2.3.1 v1.01:\r | |
735 | - 5.1.3.4 OpenProtocol() and CloseProtocol() -- for accessing the\r | |
736 | underlying device\r | |
737 | - 9 Driver Binding Protocol -- for exporting ourselves\r | |
738 | \r | |
739 | Specs relevant in the specific sense:\r | |
740 | - UEFI Spec 2.3.1 + Errata C, 13.4 EFI PCI I/O Protocol\r | |
741 | - Driver Writer's Guide for UEFI 2.3.1 v1.01, 18 PCI Driver Design\r | |
742 | Guidelines, 18.3 PCI drivers.\r | |
743 | \r | |
744 | @param[in] This The EFI_DRIVER_BINDING_PROTOCOL object\r | |
745 | incorporating this driver (independently of\r | |
746 | any device).\r | |
747 | \r | |
748 | @param[in] DeviceHandle The device to probe.\r | |
749 | \r | |
750 | @param[in] RemainingDevicePath Relevant only for bus drivers, ignored.\r | |
751 | \r | |
752 | \r | |
753 | @retval EFI_SUCCESS The driver supports the device being probed.\r | |
754 | \r | |
755 | @retval EFI_UNSUPPORTED Based on virtio-blk PCI discovery, we do not support\r | |
756 | the device.\r | |
757 | \r | |
758 | @return Error codes from the OpenProtocol() boot service or\r | |
759 | the PciIo protocol.\r | |
760 | \r | |
761 | **/\r | |
762 | \r | |
763 | EFI_STATUS\r | |
764 | EFIAPI\r | |
765 | VirtioBlkDriverBindingSupported (\r | |
766 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
767 | IN EFI_HANDLE DeviceHandle,\r | |
768 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r | |
769 | )\r | |
770 | {\r | |
771 | EFI_STATUS Status;\r | |
772 | EFI_PCI_IO_PROTOCOL *PciIo;\r | |
773 | PCI_TYPE00 Pci;\r | |
774 | \r | |
775 | //\r | |
776 | // Attempt to open the device with the PciIo set of interfaces. On success,\r | |
777 | // the protocol is "instantiated" for the PCI device. Covers duplicate open\r | |
778 | // attempts (EFI_ALREADY_STARTED).\r | |
779 | //\r | |
780 | Status = gBS->OpenProtocol (\r | |
781 | DeviceHandle, // candidate device\r | |
782 | &gEfiPciIoProtocolGuid, // for generic PCI access\r | |
783 | (VOID **)&PciIo, // handle to instantiate\r | |
784 | This->DriverBindingHandle, // requestor driver identity\r | |
785 | DeviceHandle, // ControllerHandle, according to\r | |
786 | // the UEFI Driver Model\r | |
787 | EFI_OPEN_PROTOCOL_BY_DRIVER // get exclusive PciIo access to\r | |
788 | // the device; to be released\r | |
789 | );\r | |
790 | if (EFI_ERROR (Status)) {\r | |
791 | return Status;\r | |
792 | }\r | |
793 | \r | |
794 | //\r | |
795 | // Read entire PCI configuration header for more extensive check ahead.\r | |
796 | //\r | |
797 | Status = PciIo->Pci.Read (\r | |
798 | PciIo, // (protocol, device)\r | |
799 | // handle\r | |
800 | EfiPciIoWidthUint32, // access width & copy\r | |
801 | // mode\r | |
802 | 0, // Offset\r | |
803 | sizeof Pci / sizeof (UINT32), // Count\r | |
804 | &Pci // target buffer\r | |
805 | );\r | |
806 | \r | |
807 | if (Status == EFI_SUCCESS) {\r | |
808 | //\r | |
809 | // virtio-0.9.5, 2.1 PCI Discovery\r | |
810 | //\r | |
811 | Status = (Pci.Hdr.VendorId == 0x1AF4 &&\r | |
812 | Pci.Hdr.DeviceId >= 0x1000 && Pci.Hdr.DeviceId <= 0x103F &&\r | |
813 | Pci.Hdr.RevisionID == 0x00 &&\r | |
814 | Pci.Device.SubsystemID == 0x02) ? EFI_SUCCESS : EFI_UNSUPPORTED;\r | |
815 | }\r | |
816 | \r | |
817 | //\r | |
818 | // We needed PCI IO access only transitorily, to see whether we support the\r | |
819 | // device or not.\r | |
820 | //\r | |
821 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
822 | This->DriverBindingHandle, DeviceHandle);\r | |
823 | return Status;\r | |
824 | }\r | |
825 | \r | |
826 | \r | |
827 | /**\r | |
828 | \r | |
829 | Configure a virtio ring.\r | |
830 | \r | |
831 | This function sets up internal storage (the guest-host communication area)\r | |
832 | and lays out several "navigation" (ie. no-ownership) pointers to parts of\r | |
833 | that storage.\r | |
834 | \r | |
835 | Relevant sections from the virtio-0.9.5 spec:\r | |
836 | - 1.1 Virtqueues,\r | |
837 | - 2.3 Virtqueue Configuration.\r | |
838 | \r | |
839 | @param[in] The number of descriptors to allocate for the\r | |
840 | virtio ring, as requested by the host.\r | |
841 | \r | |
842 | @param[out] Ring The virtio ring to set up.\r | |
843 | \r | |
844 | @retval EFI_OUT_OF_RESOURCES AllocatePages() failed to allocate contiguous\r | |
845 | pages for the requested QueueSize. Fields of\r | |
846 | Ring have indeterminate value.\r | |
847 | \r | |
848 | @retval EFI_SUCCESS Allocation and setup successful. Ring->Base\r | |
849 | (and nothing else) is responsible for\r | |
850 | deallocation.\r | |
851 | \r | |
852 | **/\r | |
853 | \r | |
854 | STATIC\r | |
855 | EFI_STATUS\r | |
856 | EFIAPI\r | |
857 | VirtioRingInit (\r | |
858 | IN UINT16 QueueSize,\r | |
859 | OUT VRING *Ring\r | |
860 | )\r | |
861 | {\r | |
862 | UINTN RingSize;\r | |
863 | volatile UINT8 *RingPagesPtr;\r | |
864 | \r | |
865 | RingSize = ALIGN_VALUE (\r | |
866 | sizeof *Ring->Desc * QueueSize +\r | |
867 | sizeof *Ring->Avail.Flags +\r | |
868 | sizeof *Ring->Avail.Idx +\r | |
869 | sizeof *Ring->Avail.Ring * QueueSize +\r | |
870 | sizeof *Ring->Avail.UsedEvent,\r | |
871 | EFI_PAGE_SIZE);\r | |
872 | \r | |
873 | RingSize += ALIGN_VALUE (\r | |
874 | sizeof *Ring->Used.Flags +\r | |
875 | sizeof *Ring->Used.Idx +\r | |
876 | sizeof *Ring->Used.UsedElem * QueueSize +\r | |
877 | sizeof *Ring->Used.AvailEvent,\r | |
878 | EFI_PAGE_SIZE);\r | |
879 | \r | |
880 | Ring->NumPages = EFI_SIZE_TO_PAGES (RingSize);\r | |
881 | Ring->Base = AllocatePages (Ring->NumPages);\r | |
882 | if (Ring->Base == NULL) {\r | |
883 | return EFI_OUT_OF_RESOURCES;\r | |
884 | }\r | |
885 | SetMem (Ring->Base, RingSize, 0x00);\r | |
886 | RingPagesPtr = Ring->Base;\r | |
887 | \r | |
888 | Ring->Desc = (volatile VOID *) RingPagesPtr;\r | |
889 | RingPagesPtr += sizeof *Ring->Desc * QueueSize;\r | |
890 | \r | |
891 | Ring->Avail.Flags = (volatile VOID *) RingPagesPtr;\r | |
892 | RingPagesPtr += sizeof *Ring->Avail.Flags;\r | |
893 | \r | |
894 | Ring->Avail.Idx = (volatile VOID *) RingPagesPtr;\r | |
895 | RingPagesPtr += sizeof *Ring->Avail.Idx;\r | |
896 | \r | |
897 | Ring->Avail.Ring = (volatile VOID *) RingPagesPtr;\r | |
898 | RingPagesPtr += sizeof *Ring->Avail.Ring * QueueSize;\r | |
899 | \r | |
900 | Ring->Avail.UsedEvent = (volatile VOID *) RingPagesPtr;\r | |
901 | RingPagesPtr += sizeof *Ring->Avail.UsedEvent;\r | |
902 | \r | |
903 | RingPagesPtr = (volatile UINT8 *) Ring->Base +\r | |
904 | ALIGN_VALUE (RingPagesPtr - (volatile UINT8 *) Ring->Base,\r | |
905 | EFI_PAGE_SIZE);\r | |
906 | \r | |
907 | Ring->Used.Flags = (volatile VOID *) RingPagesPtr;\r | |
908 | RingPagesPtr += sizeof *Ring->Used.Flags;\r | |
909 | \r | |
910 | Ring->Used.Idx = (volatile VOID *) RingPagesPtr;\r | |
911 | RingPagesPtr += sizeof *Ring->Used.Idx;\r | |
912 | \r | |
913 | Ring->Used.UsedElem = (volatile VOID *) RingPagesPtr;\r | |
914 | RingPagesPtr += sizeof *Ring->Used.UsedElem * QueueSize;\r | |
915 | \r | |
916 | Ring->Used.AvailEvent = (volatile VOID *) RingPagesPtr;\r | |
917 | RingPagesPtr += sizeof *Ring->Used.AvailEvent;\r | |
918 | \r | |
919 | Ring->QueueSize = QueueSize;\r | |
920 | return EFI_SUCCESS;\r | |
921 | }\r | |
922 | \r | |
923 | \r | |
924 | /**\r | |
925 | \r | |
926 | Tear down the internal resources of a configured virtio ring.\r | |
927 | \r | |
928 | The caller is responsible to stop the host from using this ring before\r | |
929 | invoking this function: the VSTAT_DRIVER_OK bit must be clear in\r | |
930 | VhdrDeviceStatus.\r | |
931 | \r | |
932 | @param[out] Ring The virtio ring to clean up.\r | |
933 | \r | |
934 | **/\r | |
935 | \r | |
936 | \r | |
937 | STATIC\r | |
938 | VOID\r | |
939 | EFIAPI\r | |
940 | VirtioRingUninit (\r | |
941 | IN OUT VRING *Ring\r | |
942 | )\r | |
943 | {\r | |
944 | FreePages (Ring->Base, Ring->NumPages);\r | |
945 | SetMem (Ring, sizeof *Ring, 0x00);\r | |
946 | }\r | |
947 | \r | |
948 | \r | |
949 | /**\r | |
950 | \r | |
951 | Set up all BlockIo and virtio-blk aspects of this driver for the specified\r | |
952 | device.\r | |
953 | \r | |
954 | @param[in out] Dev The driver instance to configure. The caller is\r | |
955 | responsible for Dev->PciIo's validity (ie. working IO\r | |
956 | access to the underlying virtio-blk PCI device).\r | |
957 | \r | |
958 | @retval EFI_SUCCESS Setup complete.\r | |
959 | \r | |
960 | @retval EFI_UNSUPPORTED The driver is unable to work with the virtio ring or\r | |
961 | virtio-blk attributes the host provides.\r | |
962 | \r | |
963 | @return Error codes from VirtioRingInit() or\r | |
964 | VIRTIO_CFG_READ() / VIRTIO_CFG_WRITE().\r | |
965 | \r | |
966 | **/\r | |
967 | \r | |
968 | STATIC\r | |
969 | EFI_STATUS\r | |
970 | EFIAPI\r | |
971 | VirtioBlkInit (\r | |
972 | IN OUT VBLK_DEV *Dev\r | |
973 | )\r | |
974 | {\r | |
975 | UINT8 NextDevStat;\r | |
976 | EFI_STATUS Status;\r | |
977 | \r | |
978 | UINT32 Features;\r | |
979 | UINT64 NumSectors;\r | |
980 | UINT32 BlockSize;\r | |
981 | UINT16 QueueSize;\r | |
982 | \r | |
983 | //\r | |
984 | // Execute virtio-0.9.5, 2.2.1 Device Initialization Sequence.\r | |
985 | //\r | |
986 | NextDevStat = 0; // step 1 -- reset device\r | |
987 | Status = VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, NextDevStat);\r | |
988 | if (EFI_ERROR (Status)) {\r | |
989 | goto Failed;\r | |
990 | }\r | |
991 | \r | |
992 | NextDevStat |= VSTAT_ACK; // step 2 -- acknowledge device presence\r | |
993 | Status = VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, NextDevStat);\r | |
994 | if (EFI_ERROR (Status)) {\r | |
995 | goto Failed;\r | |
996 | }\r | |
997 | \r | |
998 | NextDevStat |= VSTAT_DRIVER; // step 3 -- we know how to drive it\r | |
999 | Status = VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, NextDevStat);\r | |
1000 | if (EFI_ERROR (Status)) {\r | |
1001 | goto Failed;\r | |
1002 | }\r | |
1003 | \r | |
1004 | //\r | |
1005 | // step 4a -- retrieve and validate features\r | |
1006 | //\r | |
1007 | Status = VIRTIO_CFG_READ (Dev, VhdrDeviceFeatureBits, &Features);\r | |
1008 | if (EFI_ERROR (Status)) {\r | |
1009 | goto Failed;\r | |
1010 | }\r | |
1011 | Status = VIRTIO_CFG_READ (Dev, VhdrCapacity, &NumSectors);\r | |
1012 | if (EFI_ERROR (Status)) {\r | |
1013 | goto Failed;\r | |
1014 | }\r | |
1015 | if (NumSectors == 0) {\r | |
1016 | Status = EFI_UNSUPPORTED;\r | |
1017 | goto Failed;\r | |
1018 | }\r | |
1019 | \r | |
1020 | if (Features & VIRTIO_BLK_F_BLK_SIZE) {\r | |
1021 | Status = VIRTIO_CFG_READ (Dev, VhdrBlkSize, &BlockSize);\r | |
1022 | if (EFI_ERROR (Status)) {\r | |
1023 | goto Failed;\r | |
1024 | }\r | |
1025 | if (BlockSize == 0 || BlockSize % 512 != 0 ||\r | |
1026 | NumSectors % (BlockSize / 512) != 0) {\r | |
1027 | //\r | |
1028 | // We can only handle a logical block consisting of whole sectors,\r | |
1029 | // and only a disk composed of whole logical blocks.\r | |
1030 | //\r | |
1031 | Status = EFI_UNSUPPORTED;\r | |
1032 | goto Failed;\r | |
1033 | }\r | |
1034 | }\r | |
1035 | else {\r | |
1036 | BlockSize = 512;\r | |
1037 | }\r | |
1038 | \r | |
1039 | //\r | |
1040 | // step 4b -- allocate virtqueue\r | |
1041 | //\r | |
1042 | Status = VIRTIO_CFG_WRITE (Dev, VhdrQueueSelect, 0);\r | |
1043 | if (EFI_ERROR (Status)) {\r | |
1044 | goto Failed;\r | |
1045 | }\r | |
1046 | Status = VIRTIO_CFG_READ (Dev, VhdrQueueSize, &QueueSize);\r | |
1047 | if (EFI_ERROR (Status)) {\r | |
1048 | goto Failed;\r | |
1049 | }\r | |
1050 | if (QueueSize < 3) { // SynchronousRequest() uses at most three descriptors\r | |
1051 | Status = EFI_UNSUPPORTED;\r | |
1052 | goto Failed;\r | |
1053 | }\r | |
1054 | \r | |
1055 | Status = VirtioRingInit (QueueSize, &Dev->Ring);\r | |
1056 | if (EFI_ERROR (Status)) {\r | |
1057 | goto Failed;\r | |
1058 | }\r | |
1059 | \r | |
1060 | //\r | |
1061 | // step 4c -- Report GPFN (guest-physical frame number) of queue. If anything\r | |
1062 | // fails from here on, we must release the ring resources.\r | |
1063 | //\r | |
1064 | Status = VIRTIO_CFG_WRITE (Dev, VhdrQueueAddress,\r | |
1065 | (UINTN) Dev->Ring.Base >> EFI_PAGE_SHIFT);\r | |
1066 | if (EFI_ERROR (Status)) {\r | |
1067 | goto ReleaseQueue;\r | |
1068 | }\r | |
1069 | \r | |
1070 | //\r | |
1071 | // step 5 -- Report understood features. There are no virtio-blk specific\r | |
1072 | // features to negotiate in virtio-0.9.5, plus we do not want any of the\r | |
1073 | // device-independent (known or unknown) VIRTIO_F_* capabilities (see\r | |
1074 | // Appendix B).\r | |
1075 | //\r | |
1076 | Status = VIRTIO_CFG_WRITE (Dev, VhdrGuestFeatureBits, 0);\r | |
1077 | if (EFI_ERROR (Status)) {\r | |
1078 | goto ReleaseQueue;\r | |
1079 | }\r | |
1080 | \r | |
1081 | //\r | |
1082 | // step 6 -- initialization complete\r | |
1083 | //\r | |
1084 | NextDevStat |= VSTAT_DRIVER_OK;\r | |
1085 | Status = VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, NextDevStat);\r | |
1086 | if (EFI_ERROR (Status)) {\r | |
1087 | goto ReleaseQueue;\r | |
1088 | }\r | |
1089 | \r | |
1090 | //\r | |
1091 | // Populate the exported interface's attributes; see UEFI spec v2.3.1 +\r | |
1092 | // Errata C, 12.8 EFI Block I/O Protocol. We stick to the lowest possible\r | |
1093 | // EFI_BLOCK_IO_PROTOCOL revision for now.\r | |
1094 | //\r | |
1095 | Dev->BlockIo.Revision = 0;\r | |
1096 | Dev->BlockIo.Media = &Dev->BlockIoMedia;\r | |
1097 | Dev->BlockIo.Reset = &VirtioBlkReset;\r | |
1098 | Dev->BlockIo.ReadBlocks = &VirtioBlkReadBlocks;\r | |
1099 | Dev->BlockIo.WriteBlocks = &VirtioBlkWriteBlocks;\r | |
1100 | Dev->BlockIo.FlushBlocks = &VirtioBlkFlushBlocks;\r | |
1101 | Dev->BlockIoMedia.MediaId = 0;\r | |
1102 | Dev->BlockIoMedia.RemovableMedia = FALSE;\r | |
1103 | Dev->BlockIoMedia.MediaPresent = TRUE;\r | |
1104 | Dev->BlockIoMedia.LogicalPartition = FALSE;\r | |
1105 | Dev->BlockIoMedia.ReadOnly = !!(Features & VIRTIO_BLK_F_RO);\r | |
1106 | Dev->BlockIoMedia.WriteCaching = !!(Features & VIRTIO_BLK_F_FLUSH);\r | |
1107 | Dev->BlockIoMedia.BlockSize = BlockSize;\r | |
1108 | Dev->BlockIoMedia.IoAlign = 0;\r | |
1109 | Dev->BlockIoMedia.LastBlock = NumSectors / (BlockSize / 512) - 1;\r | |
1110 | return EFI_SUCCESS;\r | |
1111 | \r | |
1112 | ReleaseQueue:\r | |
1113 | VirtioRingUninit (&Dev->Ring);\r | |
1114 | \r | |
1115 | Failed:\r | |
1116 | //\r | |
1117 | // Notify the host about our failure to setup: virtio-0.9.5, 2.2.2.1 Device\r | |
1118 | // Status. PCI IO access failure here should not mask the original error.\r | |
1119 | //\r | |
1120 | NextDevStat |= VSTAT_FAILED;\r | |
1121 | VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, NextDevStat);\r | |
1122 | \r | |
1123 | return Status; // reached only via Failed above\r | |
1124 | }\r | |
1125 | \r | |
1126 | \r | |
1127 | /**\r | |
1128 | \r | |
1129 | Uninitialize the internals of a virtio-blk device that has been successfully\r | |
1130 | set up with VirtioBlkInit().\r | |
1131 | \r | |
1132 | @param[in out] Dev The device to clean up.\r | |
1133 | \r | |
1134 | **/\r | |
1135 | \r | |
1136 | STATIC\r | |
1137 | VOID\r | |
1138 | EFIAPI\r | |
1139 | VirtioBlkUninit (\r | |
1140 | IN OUT VBLK_DEV *Dev\r | |
1141 | )\r | |
1142 | {\r | |
1143 | //\r | |
1144 | // Reset the virtual device -- see virtio-0.9.5, 2.2.2.1 Device Status. When\r | |
1145 | // VIRTIO_CFG_WRITE() returns, the host will have learned to stay away from\r | |
1146 | // the old comms area.\r | |
1147 | //\r | |
1148 | VIRTIO_CFG_WRITE (Dev, VhdrDeviceStatus, 0);\r | |
1149 | \r | |
1150 | VirtioRingUninit (&Dev->Ring);\r | |
1151 | \r | |
1152 | SetMem (&Dev->BlockIo, sizeof Dev->BlockIo, 0x00);\r | |
1153 | SetMem (&Dev->BlockIoMedia, sizeof Dev->BlockIoMedia, 0x00);\r | |
1154 | }\r | |
1155 | \r | |
1156 | \r | |
1157 | /**\r | |
1158 | \r | |
1159 | After we've pronounced support for a specific device in\r | |
1160 | DriverBindingSupported(), we start managing said device (passed in by the\r | |
1161 | Driver Exeuction Environment) with the following service.\r | |
1162 | \r | |
1163 | See DriverBindingSupported() for specification references.\r | |
1164 | \r | |
1165 | @param[in] This The EFI_DRIVER_BINDING_PROTOCOL object\r | |
1166 | incorporating this driver (independently of\r | |
1167 | any device).\r | |
1168 | \r | |
1169 | @param[in] DeviceHandle The supported device to drive.\r | |
1170 | \r | |
1171 | @param[in] RemainingDevicePath Relevant only for bus drivers, ignored.\r | |
1172 | \r | |
1173 | \r | |
1174 | @retval EFI_SUCCESS Driver instance has been created and\r | |
1175 | initialized for the virtio-blk PCI device, it\r | |
1176 | is now accessibla via EFI_BLOCK_IO_PROTOCOL.\r | |
1177 | \r | |
1178 | @retval EFI_OUT_OF_RESOURCES Memory allocation failed.\r | |
1179 | \r | |
1180 | @return Error codes from the OpenProtocol() boot\r | |
1181 | service, the PciIo protocol, VirtioBlkInit(),\r | |
1182 | or the InstallProtocolInterface() boot service.\r | |
1183 | \r | |
1184 | **/\r | |
1185 | \r | |
1186 | EFI_STATUS\r | |
1187 | EFIAPI\r | |
1188 | VirtioBlkDriverBindingStart (\r | |
1189 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
1190 | IN EFI_HANDLE DeviceHandle,\r | |
1191 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r | |
1192 | )\r | |
1193 | {\r | |
1194 | VBLK_DEV *Dev;\r | |
1195 | EFI_STATUS Status;\r | |
1196 | \r | |
1197 | Dev = (VBLK_DEV *) AllocateZeroPool (sizeof *Dev);\r | |
1198 | if (Dev == NULL) {\r | |
1199 | return EFI_OUT_OF_RESOURCES;\r | |
1200 | }\r | |
1201 | \r | |
1202 | Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1203 | (VOID **)&Dev->PciIo, This->DriverBindingHandle,\r | |
1204 | DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);\r | |
1205 | if (EFI_ERROR (Status)) {\r | |
1206 | goto FreeVirtioBlk;\r | |
1207 | }\r | |
1208 | \r | |
1209 | //\r | |
1210 | // We must retain and ultimately restore the original PCI attributes of the\r | |
1211 | // device. See Driver Writer's Guide for UEFI 2.3.1 v1.01, 18.3 PCI drivers /\r | |
1212 | // 18.3.2 Start() and Stop().\r | |
1213 | //\r | |
1214 | // The third parameter ("Attributes", input) is ignored by the Get operation.\r | |
1215 | // The fourth parameter ("Result", output) is ignored by the Enable and Set\r | |
1216 | // operations.\r | |
1217 | //\r | |
1218 | // For virtio-blk we only need IO space access.\r | |
1219 | //\r | |
1220 | Status = Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationGet,\r | |
1221 | 0, &Dev->OriginalPciAttributes);\r | |
1222 | if (EFI_ERROR (Status)) {\r | |
1223 | goto ClosePciIo;\r | |
1224 | }\r | |
1225 | \r | |
1226 | Status = Dev->PciIo->Attributes (Dev->PciIo,\r | |
1227 | EfiPciIoAttributeOperationEnable,\r | |
1228 | EFI_PCI_IO_ATTRIBUTE_IO, NULL);\r | |
1229 | if (EFI_ERROR (Status)) {\r | |
1230 | goto ClosePciIo;\r | |
1231 | }\r | |
1232 | \r | |
1233 | //\r | |
1234 | // PCI IO access granted, configure virtio-blk device.\r | |
1235 | //\r | |
1236 | Status = VirtioBlkInit (Dev);\r | |
1237 | if (EFI_ERROR (Status)) {\r | |
1238 | goto RestorePciAttributes;\r | |
1239 | }\r | |
1240 | \r | |
1241 | //\r | |
1242 | // Setup complete, attempt to export the driver instance's BlockIo interface.\r | |
1243 | //\r | |
1244 | Dev->Signature = VBLK_SIG;\r | |
1245 | Status = gBS->InstallProtocolInterface (&DeviceHandle,\r | |
1246 | &gEfiBlockIoProtocolGuid, EFI_NATIVE_INTERFACE,\r | |
1247 | &Dev->BlockIo);\r | |
1248 | if (EFI_ERROR (Status)) {\r | |
1249 | goto UninitDev;\r | |
1250 | }\r | |
1251 | \r | |
1252 | return EFI_SUCCESS;\r | |
1253 | \r | |
1254 | UninitDev:\r | |
1255 | VirtioBlkUninit (Dev);\r | |
1256 | \r | |
1257 | RestorePciAttributes:\r | |
1258 | Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,\r | |
1259 | Dev->OriginalPciAttributes, NULL);\r | |
1260 | \r | |
1261 | ClosePciIo:\r | |
1262 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1263 | This->DriverBindingHandle, DeviceHandle);\r | |
1264 | \r | |
1265 | FreeVirtioBlk:\r | |
1266 | FreePool (Dev);\r | |
1267 | \r | |
1268 | return Status;\r | |
1269 | }\r | |
1270 | \r | |
1271 | \r | |
1272 | /**\r | |
1273 | \r | |
1274 | Stop driving a virtio-blk device and remove its BlockIo interface.\r | |
1275 | \r | |
1276 | This function replays the success path of DriverBindingStart() in reverse.\r | |
1277 | The host side virtio-blk device is reset, so that the OS boot loader or the\r | |
1278 | OS may reinitialize it.\r | |
1279 | \r | |
1280 | @param[in] This The EFI_DRIVER_BINDING_PROTOCOL object\r | |
1281 | incorporating this driver (independently of any\r | |
1282 | device).\r | |
1283 | \r | |
1284 | @param[in] DeviceHandle Stop driving this device.\r | |
1285 | \r | |
1286 | @param[in] NumberOfChildren Since this function belongs to a device driver\r | |
1287 | only (as opposed to a bus driver), the caller\r | |
1288 | environment sets NumberOfChildren to zero, and\r | |
1289 | we ignore it.\r | |
1290 | \r | |
1291 | @param[in] ChildHandleBuffer Ignored (corresponding to NumberOfChildren).\r | |
1292 | \r | |
1293 | **/\r | |
1294 | \r | |
1295 | EFI_STATUS\r | |
1296 | EFIAPI\r | |
1297 | VirtioBlkDriverBindingStop (\r | |
1298 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
1299 | IN EFI_HANDLE DeviceHandle,\r | |
1300 | IN UINTN NumberOfChildren,\r | |
1301 | IN EFI_HANDLE *ChildHandleBuffer\r | |
1302 | )\r | |
1303 | {\r | |
1304 | VBLK_DEV *Dev;\r | |
1305 | EFI_STATUS Status;\r | |
1306 | \r | |
1307 | Dev = VIRTIO_BLK_FROM_BLOCK_IO (This);\r | |
1308 | \r | |
1309 | //\r | |
1310 | // If DriverBindingStop() is called with the driver instance still in use,\r | |
1311 | // or any of the parameters are invalid, we've caught a bug.\r | |
1312 | //\r | |
1313 | Status = gBS->UninstallProtocolInterface (DeviceHandle,\r | |
1314 | &gEfiBlockIoProtocolGuid, &Dev->BlockIo);\r | |
1315 | ASSERT (Status == EFI_SUCCESS);\r | |
1316 | \r | |
1317 | VirtioBlkUninit (Dev);\r | |
1318 | \r | |
1319 | Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,\r | |
1320 | Dev->OriginalPciAttributes, NULL);\r | |
1321 | \r | |
1322 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1323 | This->DriverBindingHandle, DeviceHandle);\r | |
1324 | \r | |
1325 | FreePool (Dev);\r | |
1326 | \r | |
1327 | return EFI_SUCCESS;\r | |
1328 | }\r | |
1329 | \r | |
1330 | \r | |
1331 | //\r | |
1332 | // The static object that groups the Supported() (ie. probe), Start() and\r | |
1333 | // Stop() functions of the driver together. Refer to UEFI Spec 2.3.1 + Errata\r | |
1334 | // C, 10.1 EFI Driver Binding Protocol.\r | |
1335 | //\r | |
1336 | STATIC EFI_DRIVER_BINDING_PROTOCOL gDriverBinding = {\r | |
1337 | &VirtioBlkDriverBindingSupported,\r | |
1338 | &VirtioBlkDriverBindingStart,\r | |
1339 | &VirtioBlkDriverBindingStop,\r | |
1340 | 0x10, // Version, must be in [0x10 .. 0xFFFFFFEF] for IHV-developed drivers\r | |
1341 | NULL, // ImageHandle, to be overwritten by\r | |
1342 | // EfiLibInstallDriverBindingComponentName2() in VirtioBlkEntryPoint()\r | |
1343 | NULL // DriverBindingHandle, ditto\r | |
1344 | };\r | |
1345 | \r | |
1346 | \r | |
1347 | //\r | |
1348 | // The purpose of the following scaffolding (EFI_COMPONENT_NAME_PROTOCOL and\r | |
1349 | // EFI_COMPONENT_NAME2_PROTOCOL implementation) is to format the driver's name\r | |
1350 | // in English, for display on standard console devices. This is recommended for\r | |
1351 | // UEFI drivers that follow the UEFI Driver Model. Refer to the Driver Writer's\r | |
1352 | // Guide for UEFI 2.3.1 v1.01, 11 UEFI Driver and Controller Names.\r | |
1353 | //\r | |
1354 | // Device type names ("Virtio Block Device") are not formatted because the\r | |
1355 | // driver supports only that device type. Therefore the driver name suffices\r | |
1356 | // for unambiguous identification.\r | |
1357 | //\r | |
1358 | \r | |
1359 | STATIC GLOBAL_REMOVE_IF_UNREFERENCED\r | |
1360 | EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {\r | |
1361 | { "eng;en", L"Virtio Block Driver" },\r | |
1362 | { NULL, NULL }\r | |
1363 | };\r | |
1364 | \r | |
1365 | STATIC GLOBAL_REMOVE_IF_UNREFERENCED\r | |
1366 | EFI_COMPONENT_NAME_PROTOCOL gComponentName;\r | |
1367 | \r | |
1368 | EFI_STATUS\r | |
1369 | EFIAPI\r | |
1370 | VirtioBlkGetDriverName (\r | |
1371 | IN EFI_COMPONENT_NAME_PROTOCOL *This,\r | |
1372 | IN CHAR8 *Language,\r | |
1373 | OUT CHAR16 **DriverName\r | |
1374 | )\r | |
1375 | {\r | |
1376 | return LookupUnicodeString2 (\r | |
1377 | Language,\r | |
1378 | This->SupportedLanguages,\r | |
1379 | mDriverNameTable,\r | |
1380 | DriverName,\r | |
1381 | (BOOLEAN)(This == &gComponentName) // Iso639Language\r | |
1382 | );\r | |
1383 | }\r | |
1384 | \r | |
1385 | EFI_STATUS\r | |
1386 | EFIAPI\r | |
1387 | VirtioBlkGetDeviceName (\r | |
1388 | IN EFI_COMPONENT_NAME_PROTOCOL *This,\r | |
1389 | IN EFI_HANDLE DeviceHandle,\r | |
1390 | IN EFI_HANDLE ChildHandle,\r | |
1391 | IN CHAR8 *Language,\r | |
1392 | OUT CHAR16 **ControllerName\r | |
1393 | )\r | |
1394 | {\r | |
1395 | return EFI_UNSUPPORTED;\r | |
1396 | }\r | |
1397 | \r | |
1398 | STATIC GLOBAL_REMOVE_IF_UNREFERENCED\r | |
1399 | EFI_COMPONENT_NAME_PROTOCOL gComponentName = {\r | |
1400 | &VirtioBlkGetDriverName,\r | |
1401 | &VirtioBlkGetDeviceName,\r | |
1402 | "eng" // SupportedLanguages, ISO 639-2 language codes\r | |
1403 | };\r | |
1404 | \r | |
1405 | STATIC GLOBAL_REMOVE_IF_UNREFERENCED\r | |
1406 | EFI_COMPONENT_NAME2_PROTOCOL gComponentName2 = {\r | |
1407 | (EFI_COMPONENT_NAME2_GET_DRIVER_NAME) &VirtioBlkGetDriverName,\r | |
1408 | (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) &VirtioBlkGetDeviceName,\r | |
1409 | "en" // SupportedLanguages, RFC 4646 language codes\r | |
1410 | };\r | |
1411 | \r | |
1412 | \r | |
1413 | //\r | |
1414 | // Entry point of this driver.\r | |
1415 | //\r | |
1416 | EFI_STATUS\r | |
1417 | EFIAPI\r | |
1418 | VirtioBlkEntryPoint (\r | |
1419 | IN EFI_HANDLE ImageHandle,\r | |
1420 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
1421 | )\r | |
1422 | {\r | |
1423 | return EfiLibInstallDriverBindingComponentName2 (\r | |
1424 | ImageHandle,\r | |
1425 | SystemTable,\r | |
1426 | &gDriverBinding,\r | |
1427 | ImageHandle,\r | |
1428 | &gComponentName,\r | |
1429 | &gComponentName2\r | |
1430 | );\r | |
1431 | }\r | |
1432 | \r |