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37078a63 | 1 | /** @file\r |
2 | \r | |
3 | This driver produces Extended SCSI Pass Thru Protocol instances for\r | |
4 | virtio-scsi devices.\r | |
5 | \r | |
6 | The implementation is basic:\r | |
7 | \r | |
8 | - No hotplug / hot-unplug.\r | |
9 | \r | |
10 | - Although EFI_EXT_SCSI_PASS_THRU_PROTOCOL.PassThru() could be a good match\r | |
11 | for multiple in-flight virtio-scsi requests, we stick to synchronous\r | |
12 | requests for now.\r | |
13 | \r | |
14 | - Timeouts are not supported for EFI_EXT_SCSI_PASS_THRU_PROTOCOL.PassThru().\r | |
15 | \r | |
16 | - Only one channel is supported. (At the time of this writing, host-side\r | |
17 | virtio-scsi supports a single channel too.)\r | |
18 | \r | |
19 | - Only one request queue is used (for the one synchronous request).\r | |
20 | \r | |
21 | - The ResetChannel() and ResetTargetLun() functions of\r | |
22 | EFI_EXT_SCSI_PASS_THRU_PROTOCOL are not supported (which is allowed by the\r | |
23 | UEFI 2.3.1 Errata C specification), although\r | |
24 | VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET could be a good match. That would\r | |
25 | however require client code for the control queue, which is deemed\r | |
26 | unreasonable for now.\r | |
27 | \r | |
28 | Copyright (C) 2012, Red Hat, Inc.\r | |
29 | Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>\r | |
30 | \r | |
31 | This program and the accompanying materials are licensed and made available\r | |
32 | under the terms and conditions of the BSD License which accompanies this\r | |
33 | distribution. The full text of the license may be found at\r | |
34 | http://opensource.org/licenses/bsd-license.php\r | |
35 | \r | |
36 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
37 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
38 | \r | |
39 | **/\r | |
40 | \r | |
41 | #include <IndustryStandard/Pci.h>\r | |
42 | #include <IndustryStandard/VirtioScsi.h>\r | |
43 | #include <Library/BaseMemoryLib.h>\r | |
44 | #include <Library/DebugLib.h>\r | |
45 | #include <Library/MemoryAllocationLib.h>\r | |
46 | #include <Library/UefiBootServicesTableLib.h>\r | |
47 | #include <Library/UefiLib.h>\r | |
48 | #include <Library/VirtioLib.h>\r | |
49 | \r | |
50 | #include "VirtioScsi.h"\r | |
51 | \r | |
52 | /**\r | |
53 | \r | |
54 | Convenience macros to read and write region 0 IO space elements of the\r | |
55 | virtio-scsi PCI device, for configuration purposes.\r | |
56 | \r | |
57 | The following macros make it possible to specify only the "core parameters"\r | |
58 | for such accesses and to derive the rest. By the time VIRTIO_CFG_WRITE()\r | |
59 | returns, the transaction will have been completed.\r | |
60 | \r | |
61 | @param[in] Dev Pointer to the VSCSI_DEV structure whose PCI IO space\r | |
62 | we're accessing. Dev->PciIo must be valid.\r | |
63 | \r | |
64 | @param[in] Field A field name from VSCSI_HDR, identifying the virtio-scsi\r | |
65 | configuration item to access.\r | |
66 | \r | |
67 | @param[in] Value (VIRTIO_CFG_WRITE() only.) The value to write to the\r | |
68 | selected configuration item.\r | |
69 | \r | |
70 | @param[out] Pointer (VIRTIO_CFG_READ() only.) The object to receive the\r | |
71 | value read from the configuration item. Its type must be\r | |
72 | one of UINT8, UINT16, UINT32, UINT64.\r | |
73 | \r | |
74 | \r | |
75 | @return Status codes returned by VirtioWrite() / VirtioRead().\r | |
76 | \r | |
77 | **/\r | |
78 | \r | |
79 | #define VIRTIO_CFG_WRITE(Dev, Field, Value) (VirtioWrite ( \\r | |
80 | (Dev)->PciIo, \\r | |
81 | OFFSET_OF_VSCSI (Field), \\r | |
82 | SIZE_OF_VSCSI (Field), \\r | |
83 | (Value) \\r | |
84 | ))\r | |
85 | \r | |
86 | #define VIRTIO_CFG_READ(Dev, Field, Pointer) (VirtioRead ( \\r | |
87 | (Dev)->PciIo, \\r | |
88 | OFFSET_OF_VSCSI (Field), \\r | |
89 | SIZE_OF_VSCSI (Field), \\r | |
90 | sizeof *(Pointer), \\r | |
91 | (Pointer) \\r | |
92 | ))\r | |
93 | \r | |
94 | \r | |
95 | //\r | |
96 | // UEFI Spec 2.3.1 + Errata C, 14.7 Extended SCSI Pass Thru Protocol specifies\r | |
97 | // the PassThru() interface. Beside returning a status code, the function must\r | |
98 | // set some fields in the EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET in/out\r | |
99 | // parameter on return. The following is a full list of those fields, for\r | |
100 | // easier validation of PopulateRequest(), ParseResponse(), and\r | |
101 | // VirtioScsiPassThru() below.\r | |
102 | //\r | |
103 | // - InTransferLength\r | |
104 | // - OutTransferLength\r | |
105 | // - HostAdapterStatus\r | |
106 | // - TargetStatus\r | |
107 | // - SenseDataLength\r | |
108 | // - SenseData\r | |
109 | //\r | |
110 | // On any return from the PassThru() interface, these fields must be set,\r | |
111 | // except if the returned status code is explicitly exempt. (Actually the\r | |
112 | // implementation here conservatively sets these fields even in case not all\r | |
113 | // of them would be required by the specification.)\r | |
114 | //\r | |
115 | \r | |
116 | /**\r | |
117 | \r | |
118 | Populate a virtio-scsi request from the Extended SCSI Pass Thru Protocol\r | |
119 | packet.\r | |
120 | \r | |
121 | The caller is responsible for pre-zeroing the virtio-scsi request. The\r | |
122 | Extended SCSI Pass Thru Protocol packet is modified, to be forwarded outwards\r | |
123 | by VirtioScsiPassThru(), if invalid or unsupported parameters are detected.\r | |
124 | \r | |
125 | @param[in] Dev The virtio-scsi host device the packet targets.\r | |
126 | \r | |
127 | @param[in] Target The SCSI target controlled by the virtio-scsi host\r | |
128 | device.\r | |
129 | \r | |
130 | @param[in] Lun The Logical Unit Number under the SCSI target.\r | |
131 | \r | |
132 | @param[in out] Packet The Extended SCSI Pass Thru Protocol packet the\r | |
133 | function translates to a virtio-scsi request. On\r | |
134 | failure this parameter relays error contents.\r | |
135 | \r | |
136 | @param[out] Request The pre-zeroed virtio-scsi request to populate. This\r | |
137 | parameter is volatile-qualified because we expect the\r | |
138 | caller to append it to a virtio ring, thus\r | |
139 | assignments to Request must be visible when the\r | |
140 | function returns.\r | |
141 | \r | |
142 | \r | |
143 | @retval EFI_SUCCESS The Extended SCSI Pass Thru Protocol packet was valid,\r | |
144 | Request has been populated.\r | |
145 | \r | |
146 | @return Otherwise, invalid or unsupported parameters were\r | |
147 | detected. Status codes are meant for direct forwarding\r | |
148 | by the EFI_EXT_SCSI_PASS_THRU_PROTOCOL.PassThru()\r | |
149 | implementation.\r | |
150 | \r | |
151 | **/\r | |
152 | STATIC\r | |
153 | EFI_STATUS\r | |
154 | EFIAPI\r | |
155 | PopulateRequest (\r | |
156 | IN CONST VSCSI_DEV *Dev,\r | |
157 | IN UINT16 Target,\r | |
158 | IN UINT64 Lun,\r | |
159 | IN OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet,\r | |
160 | OUT volatile VIRTIO_SCSI_REQ *Request\r | |
161 | )\r | |
162 | {\r | |
163 | UINTN Idx;\r | |
164 | \r | |
165 | if (\r | |
166 | //\r | |
167 | // bidirectional transfer was requested, but the host doesn't support it\r | |
168 | //\r | |
169 | (Packet->InTransferLength > 0 && Packet->OutTransferLength > 0 &&\r | |
170 | !Dev->InOutSupported) ||\r | |
171 | \r | |
172 | //\r | |
173 | // a target / LUN was addressed that's impossible to encode for the host\r | |
174 | //\r | |
175 | Target > 0xFF || Lun >= 0x4000 ||\r | |
176 | \r | |
177 | //\r | |
178 | // Command Descriptor Block bigger than VIRTIO_SCSI_CDB_SIZE\r | |
179 | //\r | |
180 | Packet->CdbLength > VIRTIO_SCSI_CDB_SIZE ||\r | |
181 | \r | |
182 | //\r | |
183 | // From virtio-0.9.5, 2.3.2 Descriptor Table:\r | |
184 | // "no descriptor chain may be more than 2^32 bytes long in total".\r | |
185 | //\r | |
186 | (UINT64) Packet->InTransferLength + Packet->OutTransferLength > SIZE_1GB\r | |
187 | ) {\r | |
188 | \r | |
189 | //\r | |
190 | // this error code doesn't require updates to the Packet output fields\r | |
191 | //\r | |
192 | return EFI_UNSUPPORTED;\r | |
193 | }\r | |
194 | \r | |
195 | if (\r | |
196 | //\r | |
197 | // addressed invalid device\r | |
198 | //\r | |
199 | Target > Dev->MaxTarget || Lun > Dev->MaxLun ||\r | |
200 | \r | |
201 | //\r | |
202 | // invalid direction (there doesn't seem to be a macro for the "no data\r | |
203 | // transferred" "direction", eg. for TEST UNIT READY)\r | |
204 | //\r | |
205 | Packet->DataDirection > EFI_EXT_SCSI_DATA_DIRECTION_BIDIRECTIONAL ||\r | |
206 | \r | |
207 | //\r | |
208 | // trying to receive, but destination pointer is NULL, or contradicting\r | |
209 | // transfer direction\r | |
210 | //\r | |
211 | (Packet->InTransferLength > 0 &&\r | |
212 | (Packet->InDataBuffer == NULL ||\r | |
213 | Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_WRITE\r | |
214 | )\r | |
215 | ) ||\r | |
216 | \r | |
217 | //\r | |
218 | // trying to send, but source pointer is NULL, or contradicting transfer\r | |
219 | // direction\r | |
220 | //\r | |
221 | (Packet->OutTransferLength > 0 &&\r | |
222 | (Packet->OutDataBuffer == NULL ||\r | |
223 | Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_READ\r | |
224 | )\r | |
225 | )\r | |
226 | ) {\r | |
227 | \r | |
228 | //\r | |
229 | // this error code doesn't require updates to the Packet output fields\r | |
230 | //\r | |
231 | return EFI_INVALID_PARAMETER;\r | |
232 | }\r | |
233 | \r | |
234 | //\r | |
235 | // Catch oversized requests eagerly. If this condition evaluates to false,\r | |
236 | // then the combined size of a bidirectional request will not exceed the\r | |
237 | // virtio-scsi device's transfer limit either.\r | |
238 | //\r | |
239 | if (ALIGN_VALUE (Packet->OutTransferLength, 512) / 512\r | |
240 | > Dev->MaxSectors / 2 ||\r | |
241 | ALIGN_VALUE (Packet->InTransferLength, 512) / 512\r | |
242 | > Dev->MaxSectors / 2) {\r | |
243 | Packet->InTransferLength = (Dev->MaxSectors / 2) * 512;\r | |
244 | Packet->OutTransferLength = (Dev->MaxSectors / 2) * 512;\r | |
245 | Packet->HostAdapterStatus =\r | |
246 | EFI_EXT_SCSI_STATUS_HOST_ADAPTER_DATA_OVERRUN_UNDERRUN;\r | |
247 | Packet->TargetStatus = EFI_EXT_SCSI_STATUS_TARGET_GOOD;\r | |
248 | Packet->SenseDataLength = 0;\r | |
249 | return EFI_BAD_BUFFER_SIZE;\r | |
250 | }\r | |
251 | \r | |
252 | //\r | |
253 | // target & LUN encoding: see virtio-0.9.5, Appendix I: SCSI Host Device,\r | |
254 | // Device Operation: request queues\r | |
255 | //\r | |
256 | Request->Lun[0] = 1;\r | |
257 | Request->Lun[1] = (UINT8) Target;\r | |
258 | Request->Lun[2] = (UINT8) ((Lun >> 8) | 0x40);\r | |
259 | Request->Lun[3] = (UINT8) Lun;\r | |
260 | \r | |
261 | //\r | |
262 | // CopyMem() would cast away the "volatile" qualifier before access, which is\r | |
263 | // undefined behavior (ISO C99 6.7.3p5)\r | |
264 | //\r | |
265 | for (Idx = 0; Idx < Packet->CdbLength; ++Idx) {\r | |
266 | Request->Cdb[Idx] = ((UINT8 *) Packet->Cdb)[Idx];\r | |
267 | }\r | |
268 | \r | |
269 | return EFI_SUCCESS;\r | |
270 | }\r | |
271 | \r | |
272 | \r | |
273 | /**\r | |
274 | \r | |
275 | Parse the virtio-scsi device's response, translate it to an EFI status code,\r | |
276 | and update the Extended SCSI Pass Thru Protocol packet, to be returned by\r | |
277 | the EFI_EXT_SCSI_PASS_THRU_PROTOCOL.PassThru() implementation.\r | |
278 | \r | |
279 | @param[in out] Packet The Extended SCSI Pass Thru Protocol packet that has\r | |
280 | been translated to a virtio-scsi request with\r | |
281 | PopulateRequest(), and processed by the host. On\r | |
282 | output this parameter is updated with response or\r | |
283 | error contents.\r | |
284 | \r | |
285 | @param[in] Response The virtio-scsi response structure to parse. We expect\r | |
286 | it to come from a virtio ring, thus it is qualified\r | |
287 | volatile.\r | |
288 | \r | |
289 | \r | |
290 | @return PassThru() status codes mandated by UEFI Spec 2.3.1 + Errata C, 14.7\r | |
291 | Extended SCSI Pass Thru Protocol.\r | |
292 | \r | |
293 | **/\r | |
294 | STATIC\r | |
295 | EFI_STATUS\r | |
296 | EFIAPI\r | |
297 | ParseResponse (\r | |
298 | IN OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet,\r | |
299 | IN CONST volatile VIRTIO_SCSI_RESP *Response\r | |
300 | )\r | |
301 | {\r | |
302 | UINTN ResponseSenseLen;\r | |
303 | UINTN Idx;\r | |
304 | \r | |
305 | //\r | |
306 | // return sense data (length and contents) in all cases, truncated if needed\r | |
307 | //\r | |
308 | ResponseSenseLen = MIN (Response->SenseLen, VIRTIO_SCSI_SENSE_SIZE);\r | |
309 | if (Packet->SenseDataLength > ResponseSenseLen) {\r | |
310 | Packet->SenseDataLength = (UINT8) ResponseSenseLen;\r | |
311 | }\r | |
312 | for (Idx = 0; Idx < Packet->SenseDataLength; ++Idx) {\r | |
313 | ((UINT8 *) Packet->SenseData)[Idx] = Response->Sense[Idx];\r | |
314 | }\r | |
315 | \r | |
316 | //\r | |
317 | // Report actual transfer lengths. The logic below covers all three\r | |
318 | // DataDirections (read, write, bidirectional).\r | |
319 | //\r | |
320 | // -+- @ 0\r | |
321 | // |\r | |
322 | // | write ^ @ Residual (unprocessed)\r | |
323 | // | |\r | |
324 | // -+- @ OutTransferLength -+- @ InTransferLength\r | |
325 | // | |\r | |
326 | // | read |\r | |
327 | // | |\r | |
328 | // V @ OutTransferLength + InTransferLength -+- @ 0\r | |
329 | //\r | |
330 | if (Response->Residual <= Packet->InTransferLength) {\r | |
331 | Packet->InTransferLength -= Response->Residual;\r | |
332 | }\r | |
333 | else {\r | |
334 | Packet->OutTransferLength -= Response->Residual - Packet->InTransferLength;\r | |
335 | Packet->InTransferLength = 0;\r | |
336 | }\r | |
337 | \r | |
338 | //\r | |
339 | // report target status in all cases\r | |
340 | //\r | |
341 | Packet->TargetStatus = Response->Status;\r | |
342 | \r | |
343 | //\r | |
344 | // host adapter status and function return value depend on virtio-scsi\r | |
345 | // response code\r | |
346 | //\r | |
347 | switch (Response->Response) {\r | |
348 | case VIRTIO_SCSI_S_OK:\r | |
349 | Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OK;\r | |
350 | return EFI_SUCCESS;\r | |
351 | \r | |
352 | case VIRTIO_SCSI_S_OVERRUN:\r | |
353 | Packet->HostAdapterStatus =\r | |
354 | EFI_EXT_SCSI_STATUS_HOST_ADAPTER_DATA_OVERRUN_UNDERRUN;\r | |
355 | break;\r | |
356 | \r | |
357 | case VIRTIO_SCSI_S_BAD_TARGET:\r | |
358 | //\r | |
359 | // This is non-intuitive but explicitly required by the\r | |
360 | // EFI_EXT_SCSI_PASS_THRU_PROTOCOL.PassThru() specification for\r | |
361 | // disconnected (but otherwise valid) target / LUN addresses.\r | |
362 | //\r | |
363 | Packet->HostAdapterStatus =\r | |
364 | EFI_EXT_SCSI_STATUS_HOST_ADAPTER_TIMEOUT_COMMAND;\r | |
365 | return EFI_TIMEOUT;\r | |
366 | \r | |
367 | case VIRTIO_SCSI_S_RESET:\r | |
368 | Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_BUS_RESET;\r | |
369 | break;\r | |
370 | \r | |
371 | case VIRTIO_SCSI_S_BUSY:\r | |
372 | Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OK;\r | |
373 | return EFI_NOT_READY;\r | |
374 | \r | |
375 | //\r | |
376 | // Lump together the rest. The mapping for VIRTIO_SCSI_S_ABORTED is\r | |
377 | // intentional as well, not an oversight.\r | |
378 | //\r | |
379 | case VIRTIO_SCSI_S_ABORTED:\r | |
380 | case VIRTIO_SCSI_S_TRANSPORT_FAILURE:\r | |
381 | case VIRTIO_SCSI_S_TARGET_FAILURE:\r | |
382 | case VIRTIO_SCSI_S_NEXUS_FAILURE:\r | |
383 | case VIRTIO_SCSI_S_FAILURE:\r | |
384 | default:\r | |
385 | Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OTHER;\r | |
386 | }\r | |
387 | \r | |
388 | return EFI_DEVICE_ERROR;\r | |
389 | }\r | |
390 | \r | |
391 | \r | |
392 | //\r | |
393 | // The next seven functions implement EFI_EXT_SCSI_PASS_THRU_PROTOCOL\r | |
394 | // for the virtio-scsi HBA. Refer to UEFI Spec 2.3.1 + Errata C, sections\r | |
395 | // - 14.1 SCSI Driver Model Overview,\r | |
396 | // - 14.7 Extended SCSI Pass Thru Protocol.\r | |
397 | //\r | |
398 | \r | |
399 | EFI_STATUS\r | |
400 | EFIAPI\r | |
401 | VirtioScsiPassThru (\r | |
402 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
403 | IN UINT8 *Target,\r | |
404 | IN UINT64 Lun,\r | |
405 | IN OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet,\r | |
406 | IN EFI_EVENT Event OPTIONAL\r | |
407 | )\r | |
408 | {\r | |
409 | VSCSI_DEV *Dev;\r | |
410 | UINT16 TargetValue;\r | |
411 | EFI_STATUS Status;\r | |
412 | volatile VIRTIO_SCSI_REQ Request;\r | |
413 | volatile VIRTIO_SCSI_RESP Response;\r | |
414 | DESC_INDICES Indices;\r | |
415 | \r | |
151304d9 | 416 | ZeroMem ((VOID*) &Request, sizeof (Request));\r |
417 | ZeroMem ((VOID*) &Response, sizeof (Response));\r | |
37078a63 | 418 | \r |
419 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);\r | |
420 | CopyMem (&TargetValue, Target, sizeof TargetValue);\r | |
421 | \r | |
422 | Status = PopulateRequest (Dev, TargetValue, Lun, Packet, &Request);\r | |
423 | if (EFI_ERROR (Status)) {\r | |
424 | return Status;\r | |
425 | }\r | |
426 | \r | |
427 | VirtioPrepare (&Dev->Ring, &Indices);\r | |
428 | \r | |
429 | //\r | |
430 | // preset a host status for ourselves that we do not accept as success\r | |
431 | //\r | |
432 | Response.Response = VIRTIO_SCSI_S_FAILURE;\r | |
433 | \r | |
434 | //\r | |
435 | // ensured by VirtioScsiInit() -- this predicate, in combination with the\r | |
436 | // lock-step progress, ensures we don't have to track free descriptors.\r | |
437 | //\r | |
438 | ASSERT (Dev->Ring.QueueSize >= 4);\r | |
439 | \r | |
440 | //\r | |
441 | // enqueue Request\r | |
442 | //\r | |
443 | VirtioAppendDesc (&Dev->Ring, (UINTN) &Request, sizeof Request,\r | |
444 | VRING_DESC_F_NEXT, &Indices);\r | |
445 | \r | |
446 | //\r | |
447 | // enqueue "dataout" if any\r | |
448 | //\r | |
449 | if (Packet->OutTransferLength > 0) {\r | |
450 | VirtioAppendDesc (&Dev->Ring, (UINTN) Packet->OutDataBuffer,\r | |
451 | Packet->OutTransferLength, VRING_DESC_F_NEXT, &Indices);\r | |
452 | }\r | |
453 | \r | |
454 | //\r | |
455 | // enqueue Response, to be written by the host\r | |
456 | //\r | |
457 | VirtioAppendDesc (&Dev->Ring, (UINTN) &Response, sizeof Response,\r | |
458 | VRING_DESC_F_WRITE | (Packet->InTransferLength > 0 ?\r | |
459 | VRING_DESC_F_NEXT : 0),\r | |
460 | &Indices);\r | |
461 | \r | |
462 | //\r | |
463 | // enqueue "datain" if any, to be written by the host\r | |
464 | //\r | |
465 | if (Packet->InTransferLength > 0) {\r | |
466 | VirtioAppendDesc (&Dev->Ring, (UINTN) Packet->InDataBuffer,\r | |
467 | Packet->InTransferLength, VRING_DESC_F_WRITE, &Indices);\r | |
468 | }\r | |
469 | \r | |
470 | // If kicking the host fails, we must fake a host adapter error.\r | |
471 | // EFI_NOT_READY would save us the effort, but it would also suggest that the\r | |
472 | // caller retry.\r | |
473 | //\r | |
474 | if (VirtioFlush (Dev->PciIo, VIRTIO_SCSI_REQUEST_QUEUE, &Dev->Ring,\r | |
475 | &Indices) != EFI_SUCCESS) {\r | |
476 | Packet->InTransferLength = 0;\r | |
477 | Packet->OutTransferLength = 0;\r | |
478 | Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OTHER;\r | |
479 | Packet->TargetStatus = EFI_EXT_SCSI_STATUS_TARGET_GOOD;\r | |
480 | Packet->SenseDataLength = 0;\r | |
481 | return EFI_DEVICE_ERROR;\r | |
482 | }\r | |
483 | \r | |
484 | return ParseResponse (Packet, &Response);\r | |
485 | }\r | |
486 | \r | |
487 | \r | |
488 | EFI_STATUS\r | |
489 | EFIAPI\r | |
490 | VirtioScsiGetNextTargetLun (\r | |
491 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
492 | IN OUT UINT8 **TargetPointer,\r | |
493 | IN OUT UINT64 *Lun\r | |
494 | )\r | |
495 | {\r | |
496 | UINT8 *Target;\r | |
497 | UINTN Idx;\r | |
498 | UINT16 LastTarget;\r | |
499 | VSCSI_DEV *Dev;\r | |
500 | \r | |
501 | //\r | |
502 | // the TargetPointer input parameter is unnecessarily a pointer-to-pointer\r | |
503 | //\r | |
504 | Target = *TargetPointer;\r | |
505 | \r | |
506 | //\r | |
507 | // Search for first non-0xFF byte. If not found, return first target & LUN.\r | |
508 | //\r | |
509 | for (Idx = 0; Idx < TARGET_MAX_BYTES && Target[Idx] == 0xFF; ++Idx)\r | |
510 | ;\r | |
511 | if (Idx == TARGET_MAX_BYTES) {\r | |
512 | SetMem (Target, TARGET_MAX_BYTES, 0x00);\r | |
513 | *Lun = 0;\r | |
514 | return EFI_SUCCESS;\r | |
515 | }\r | |
516 | \r | |
517 | //\r | |
518 | // see the TARGET_MAX_BYTES check in "VirtioScsi.h"\r | |
519 | //\r | |
520 | CopyMem (&LastTarget, Target, sizeof LastTarget);\r | |
521 | \r | |
522 | //\r | |
523 | // increment (target, LUN) pair if valid on input\r | |
524 | //\r | |
525 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);\r | |
526 | if (LastTarget > Dev->MaxTarget || *Lun > Dev->MaxLun) {\r | |
527 | return EFI_INVALID_PARAMETER;\r | |
528 | }\r | |
529 | \r | |
530 | if (*Lun < Dev->MaxLun) {\r | |
531 | ++*Lun;\r | |
532 | return EFI_SUCCESS;\r | |
533 | }\r | |
534 | \r | |
535 | if (LastTarget < Dev->MaxTarget) {\r | |
536 | *Lun = 0;\r | |
537 | ++LastTarget;\r | |
538 | CopyMem (Target, &LastTarget, sizeof LastTarget);\r | |
539 | return EFI_SUCCESS;\r | |
540 | }\r | |
541 | \r | |
542 | return EFI_NOT_FOUND;\r | |
543 | }\r | |
544 | \r | |
545 | \r | |
546 | EFI_STATUS\r | |
547 | EFIAPI\r | |
548 | VirtioScsiBuildDevicePath (\r | |
549 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
550 | IN UINT8 *Target,\r | |
551 | IN UINT64 Lun,\r | |
552 | IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath\r | |
553 | )\r | |
554 | {\r | |
555 | UINT16 TargetValue;\r | |
556 | VSCSI_DEV *Dev;\r | |
557 | SCSI_DEVICE_PATH *ScsiDevicePath;\r | |
558 | \r | |
559 | if (DevicePath == NULL) {\r | |
560 | return EFI_INVALID_PARAMETER;\r | |
561 | }\r | |
562 | \r | |
563 | CopyMem (&TargetValue, Target, sizeof TargetValue);\r | |
564 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);\r | |
565 | if (TargetValue > Dev->MaxTarget || Lun > Dev->MaxLun || Lun > 0xFFFF) {\r | |
566 | return EFI_NOT_FOUND;\r | |
567 | }\r | |
568 | \r | |
569 | ScsiDevicePath = AllocatePool (sizeof *ScsiDevicePath);\r | |
570 | if (ScsiDevicePath == NULL) {\r | |
571 | return EFI_OUT_OF_RESOURCES;\r | |
572 | }\r | |
573 | \r | |
574 | ScsiDevicePath->Header.Type = MESSAGING_DEVICE_PATH;\r | |
575 | ScsiDevicePath->Header.SubType = MSG_SCSI_DP;\r | |
576 | ScsiDevicePath->Header.Length[0] = (UINT8) sizeof *ScsiDevicePath;\r | |
577 | ScsiDevicePath->Header.Length[1] = (UINT8) (sizeof *ScsiDevicePath >> 8);\r | |
578 | ScsiDevicePath->Pun = TargetValue;\r | |
579 | ScsiDevicePath->Lun = (UINT16) Lun;\r | |
580 | \r | |
581 | *DevicePath = &ScsiDevicePath->Header;\r | |
582 | return EFI_SUCCESS;\r | |
583 | }\r | |
584 | \r | |
585 | \r | |
586 | EFI_STATUS\r | |
587 | EFIAPI\r | |
588 | VirtioScsiGetTargetLun (\r | |
589 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
590 | IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,\r | |
591 | OUT UINT8 **TargetPointer,\r | |
592 | OUT UINT64 *Lun\r | |
593 | )\r | |
594 | {\r | |
595 | SCSI_DEVICE_PATH *ScsiDevicePath;\r | |
596 | VSCSI_DEV *Dev;\r | |
597 | UINT8 *Target;\r | |
598 | \r | |
599 | if (DevicePath == NULL || TargetPointer == NULL || *TargetPointer == NULL ||\r | |
600 | Lun == NULL) {\r | |
601 | return EFI_INVALID_PARAMETER;\r | |
602 | }\r | |
603 | \r | |
604 | if (DevicePath->Type != MESSAGING_DEVICE_PATH ||\r | |
605 | DevicePath->SubType != MSG_SCSI_DP) {\r | |
606 | return EFI_UNSUPPORTED;\r | |
607 | }\r | |
608 | \r | |
609 | ScsiDevicePath = (SCSI_DEVICE_PATH *) DevicePath;\r | |
610 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);\r | |
611 | if (ScsiDevicePath->Pun > Dev->MaxTarget ||\r | |
612 | ScsiDevicePath->Lun > Dev->MaxLun) {\r | |
613 | return EFI_NOT_FOUND;\r | |
614 | }\r | |
615 | \r | |
616 | //\r | |
617 | // a) the TargetPointer input parameter is unnecessarily a pointer-to-pointer\r | |
618 | // b) see the TARGET_MAX_BYTES check in "VirtioScsi.h"\r | |
619 | // c) ScsiDevicePath->Pun is an UINT16\r | |
620 | //\r | |
621 | Target = *TargetPointer;\r | |
622 | CopyMem (Target, &ScsiDevicePath->Pun, 2);\r | |
623 | SetMem (Target + 2, TARGET_MAX_BYTES - 2, 0x00);\r | |
624 | \r | |
625 | *Lun = ScsiDevicePath->Lun;\r | |
626 | return EFI_SUCCESS;\r | |
627 | }\r | |
628 | \r | |
629 | \r | |
630 | EFI_STATUS\r | |
631 | EFIAPI\r | |
632 | VirtioScsiResetChannel (\r | |
633 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This\r | |
634 | )\r | |
635 | {\r | |
636 | return EFI_UNSUPPORTED;\r | |
637 | }\r | |
638 | \r | |
639 | \r | |
640 | EFI_STATUS\r | |
641 | EFIAPI\r | |
642 | VirtioScsiResetTargetLun (\r | |
643 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
644 | IN UINT8 *Target,\r | |
645 | IN UINT64 Lun\r | |
646 | )\r | |
647 | {\r | |
648 | return EFI_UNSUPPORTED;\r | |
649 | }\r | |
650 | \r | |
651 | \r | |
652 | EFI_STATUS\r | |
653 | EFIAPI\r | |
654 | VirtioScsiGetNextTarget (\r | |
655 | IN EFI_EXT_SCSI_PASS_THRU_PROTOCOL *This,\r | |
656 | IN OUT UINT8 **TargetPointer\r | |
657 | )\r | |
658 | {\r | |
659 | UINT8 *Target;\r | |
660 | UINTN Idx;\r | |
661 | UINT16 LastTarget;\r | |
662 | VSCSI_DEV *Dev;\r | |
663 | \r | |
664 | //\r | |
665 | // the TargetPointer input parameter is unnecessarily a pointer-to-pointer\r | |
666 | //\r | |
667 | Target = *TargetPointer;\r | |
668 | \r | |
669 | //\r | |
670 | // Search for first non-0xFF byte. If not found, return first target.\r | |
671 | //\r | |
672 | for (Idx = 0; Idx < TARGET_MAX_BYTES && Target[Idx] == 0xFF; ++Idx)\r | |
673 | ;\r | |
674 | if (Idx == TARGET_MAX_BYTES) {\r | |
675 | SetMem (Target, TARGET_MAX_BYTES, 0x00);\r | |
676 | return EFI_SUCCESS;\r | |
677 | }\r | |
678 | \r | |
679 | //\r | |
680 | // see the TARGET_MAX_BYTES check in "VirtioScsi.h"\r | |
681 | //\r | |
682 | CopyMem (&LastTarget, Target, sizeof LastTarget);\r | |
683 | \r | |
684 | //\r | |
685 | // increment target if valid on input\r | |
686 | //\r | |
687 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (This);\r | |
688 | if (LastTarget > Dev->MaxTarget) {\r | |
689 | return EFI_INVALID_PARAMETER;\r | |
690 | }\r | |
691 | \r | |
692 | if (LastTarget < Dev->MaxTarget) {\r | |
693 | ++LastTarget;\r | |
694 | CopyMem (Target, &LastTarget, sizeof LastTarget);\r | |
695 | return EFI_SUCCESS;\r | |
696 | }\r | |
697 | \r | |
698 | return EFI_NOT_FOUND;\r | |
699 | }\r | |
700 | \r | |
701 | \r | |
702 | STATIC\r | |
703 | EFI_STATUS\r | |
704 | EFIAPI\r | |
705 | VirtioScsiInit (\r | |
706 | IN OUT VSCSI_DEV *Dev\r | |
707 | )\r | |
708 | {\r | |
709 | UINT8 NextDevStat;\r | |
710 | EFI_STATUS Status;\r | |
711 | \r | |
712 | UINT32 Features;\r | |
713 | UINT16 MaxChannel; // for validation only\r | |
714 | UINT32 NumQueues; // for validation only\r | |
715 | UINT16 QueueSize;\r | |
716 | \r | |
717 | //\r | |
718 | // Execute virtio-0.9.5, 2.2.1 Device Initialization Sequence.\r | |
719 | //\r | |
720 | NextDevStat = 0; // step 1 -- reset device\r | |
721 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);\r | |
722 | if (EFI_ERROR (Status)) {\r | |
723 | goto Failed;\r | |
724 | }\r | |
725 | \r | |
726 | NextDevStat |= VSTAT_ACK; // step 2 -- acknowledge device presence\r | |
727 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);\r | |
728 | if (EFI_ERROR (Status)) {\r | |
729 | goto Failed;\r | |
730 | }\r | |
731 | \r | |
732 | NextDevStat |= VSTAT_DRIVER; // step 3 -- we know how to drive it\r | |
733 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);\r | |
734 | if (EFI_ERROR (Status)) {\r | |
735 | goto Failed;\r | |
736 | }\r | |
737 | \r | |
738 | //\r | |
739 | // step 4a -- retrieve and validate features\r | |
740 | //\r | |
741 | Status = VIRTIO_CFG_READ (Dev, Generic.VhdrDeviceFeatureBits, &Features);\r | |
742 | if (EFI_ERROR (Status)) {\r | |
743 | goto Failed;\r | |
744 | }\r | |
745 | Dev->InOutSupported = !!(Features & VIRTIO_SCSI_F_INOUT);\r | |
746 | \r | |
747 | Status = VIRTIO_CFG_READ (Dev, VhdrMaxChannel, &MaxChannel);\r | |
748 | if (EFI_ERROR (Status)) {\r | |
749 | goto Failed;\r | |
750 | }\r | |
751 | if (MaxChannel != 0) {\r | |
752 | //\r | |
753 | // this driver is for a single-channel virtio-scsi HBA\r | |
754 | //\r | |
755 | Status = EFI_UNSUPPORTED;\r | |
756 | goto Failed;\r | |
757 | }\r | |
758 | \r | |
759 | Status = VIRTIO_CFG_READ (Dev, VhdrNumQueues, &NumQueues);\r | |
760 | if (EFI_ERROR (Status)) {\r | |
761 | goto Failed;\r | |
762 | }\r | |
763 | if (NumQueues < 1) {\r | |
764 | Status = EFI_UNSUPPORTED;\r | |
765 | goto Failed;\r | |
766 | }\r | |
767 | \r | |
768 | Status = VIRTIO_CFG_READ (Dev, VhdrMaxTarget, &Dev->MaxTarget);\r | |
769 | if (EFI_ERROR (Status)) {\r | |
770 | goto Failed;\r | |
771 | }\r | |
772 | if (Dev->MaxTarget > PcdGet16 (PcdVirtioScsiMaxTargetLimit)) {\r | |
773 | Dev->MaxTarget = PcdGet16 (PcdVirtioScsiMaxTargetLimit);\r | |
774 | }\r | |
775 | \r | |
776 | Status = VIRTIO_CFG_READ (Dev, VhdrMaxLun, &Dev->MaxLun);\r | |
777 | if (EFI_ERROR (Status)) {\r | |
778 | goto Failed;\r | |
779 | }\r | |
780 | if (Dev->MaxLun > PcdGet32 (PcdVirtioScsiMaxLunLimit)) {\r | |
781 | Dev->MaxLun = PcdGet32 (PcdVirtioScsiMaxLunLimit);\r | |
782 | }\r | |
783 | \r | |
784 | Status = VIRTIO_CFG_READ (Dev, VhdrMaxSectors, &Dev->MaxSectors);\r | |
785 | if (EFI_ERROR (Status)) {\r | |
786 | goto Failed;\r | |
787 | }\r | |
788 | if (Dev->MaxSectors < 2) {\r | |
789 | //\r | |
790 | // We must be able to halve it for bidirectional transfers\r | |
791 | // (see EFI_BAD_BUFFER_SIZE in PopulateRequest()).\r | |
792 | //\r | |
793 | Status = EFI_UNSUPPORTED;\r | |
794 | goto Failed;\r | |
795 | }\r | |
796 | \r | |
797 | //\r | |
798 | // step 4b -- allocate request virtqueue\r | |
799 | //\r | |
800 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrQueueSelect,\r | |
801 | VIRTIO_SCSI_REQUEST_QUEUE);\r | |
802 | if (EFI_ERROR (Status)) {\r | |
803 | goto Failed;\r | |
804 | }\r | |
805 | Status = VIRTIO_CFG_READ (Dev, Generic.VhdrQueueSize, &QueueSize);\r | |
806 | if (EFI_ERROR (Status)) {\r | |
807 | goto Failed;\r | |
808 | }\r | |
809 | //\r | |
810 | // VirtioScsiPassThru() uses at most four descriptors\r | |
811 | //\r | |
812 | if (QueueSize < 4) {\r | |
813 | Status = EFI_UNSUPPORTED;\r | |
814 | goto Failed;\r | |
815 | }\r | |
816 | \r | |
817 | Status = VirtioRingInit (QueueSize, &Dev->Ring);\r | |
818 | if (EFI_ERROR (Status)) {\r | |
819 | goto Failed;\r | |
820 | }\r | |
821 | \r | |
822 | //\r | |
823 | // step 4c -- Report GPFN (guest-physical frame number) of queue. If anything\r | |
824 | // fails from here on, we must release the ring resources.\r | |
825 | //\r | |
826 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrQueueAddress,\r | |
827 | (UINTN) Dev->Ring.Base >> EFI_PAGE_SHIFT);\r | |
828 | if (EFI_ERROR (Status)) {\r | |
829 | goto ReleaseQueue;\r | |
830 | }\r | |
831 | \r | |
832 | //\r | |
833 | // step 5 -- Report understood features and guest-tuneables. We want none of\r | |
834 | // the known (or unknown) VIRTIO_SCSI_F_* or VIRTIO_F_* capabilities (see\r | |
835 | // virtio-0.9.5, Appendices B and I), except bidirectional transfers.\r | |
836 | //\r | |
837 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrGuestFeatureBits,\r | |
838 | Features & VIRTIO_SCSI_F_INOUT);\r | |
839 | if (EFI_ERROR (Status)) {\r | |
840 | goto ReleaseQueue;\r | |
841 | }\r | |
842 | \r | |
843 | //\r | |
844 | // We expect these maximum sizes from the host. Since they are\r | |
845 | // guest-negotiable, ask for them rather than just checking them.\r | |
846 | //\r | |
847 | Status = VIRTIO_CFG_WRITE (Dev, VhdrCdbSize, VIRTIO_SCSI_CDB_SIZE);\r | |
848 | if (EFI_ERROR (Status)) {\r | |
849 | goto ReleaseQueue;\r | |
850 | }\r | |
851 | Status = VIRTIO_CFG_WRITE (Dev, VhdrSenseSize, VIRTIO_SCSI_SENSE_SIZE);\r | |
852 | if (EFI_ERROR (Status)) {\r | |
853 | goto ReleaseQueue;\r | |
854 | }\r | |
855 | \r | |
856 | //\r | |
857 | // step 6 -- initialization complete\r | |
858 | //\r | |
859 | NextDevStat |= VSTAT_DRIVER_OK;\r | |
860 | Status = VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);\r | |
861 | if (EFI_ERROR (Status)) {\r | |
862 | goto ReleaseQueue;\r | |
863 | }\r | |
864 | \r | |
865 | //\r | |
866 | // populate the exported interface's attributes\r | |
867 | //\r | |
868 | Dev->PassThru.Mode = &Dev->PassThruMode;\r | |
869 | Dev->PassThru.PassThru = &VirtioScsiPassThru;\r | |
870 | Dev->PassThru.GetNextTargetLun = &VirtioScsiGetNextTargetLun;\r | |
871 | Dev->PassThru.BuildDevicePath = &VirtioScsiBuildDevicePath;\r | |
872 | Dev->PassThru.GetTargetLun = &VirtioScsiGetTargetLun;\r | |
873 | Dev->PassThru.ResetChannel = &VirtioScsiResetChannel;\r | |
874 | Dev->PassThru.ResetTargetLun = &VirtioScsiResetTargetLun;\r | |
875 | Dev->PassThru.GetNextTarget = &VirtioScsiGetNextTarget;\r | |
876 | \r | |
877 | //\r | |
878 | // AdapterId is a target for which no handle will be created during bus scan.\r | |
879 | // Prevent any conflict with real devices.\r | |
880 | //\r | |
881 | Dev->PassThruMode.AdapterId = 0xFFFFFFFF;\r | |
882 | \r | |
883 | //\r | |
884 | // Set both physical and logical attributes for non-RAID SCSI channel. See\r | |
885 | // Driver Writer's Guide for UEFI 2.3.1 v1.01, 20.1.5 Implementing Extended\r | |
886 | // SCSI Pass Thru Protocol.\r | |
887 | //\r | |
888 | Dev->PassThruMode.Attributes = EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_PHYSICAL |\r | |
889 | EFI_EXT_SCSI_PASS_THRU_ATTRIBUTES_LOGICAL;\r | |
890 | \r | |
891 | //\r | |
892 | // no restriction on transfer buffer alignment\r | |
893 | //\r | |
894 | Dev->PassThruMode.IoAlign = 0;\r | |
895 | \r | |
896 | return EFI_SUCCESS;\r | |
897 | \r | |
898 | ReleaseQueue:\r | |
899 | VirtioRingUninit (&Dev->Ring);\r | |
900 | \r | |
901 | Failed:\r | |
902 | //\r | |
903 | // Notify the host about our failure to setup: virtio-0.9.5, 2.2.2.1 Device\r | |
904 | // Status. PCI IO access failure here should not mask the original error.\r | |
905 | //\r | |
906 | NextDevStat |= VSTAT_FAILED;\r | |
907 | VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, NextDevStat);\r | |
908 | \r | |
909 | Dev->InOutSupported = FALSE;\r | |
910 | Dev->MaxTarget = 0;\r | |
911 | Dev->MaxLun = 0;\r | |
912 | Dev->MaxSectors = 0;\r | |
913 | \r | |
914 | return Status; // reached only via Failed above\r | |
915 | }\r | |
916 | \r | |
917 | \r | |
918 | \r | |
919 | STATIC\r | |
920 | VOID\r | |
921 | EFIAPI\r | |
922 | VirtioScsiUninit (\r | |
923 | IN OUT VSCSI_DEV *Dev\r | |
924 | )\r | |
925 | {\r | |
926 | //\r | |
927 | // Reset the virtual device -- see virtio-0.9.5, 2.2.2.1 Device Status. When\r | |
928 | // VIRTIO_CFG_WRITE() returns, the host will have learned to stay away from\r | |
929 | // the old comms area.\r | |
930 | //\r | |
931 | VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, 0);\r | |
932 | \r | |
933 | Dev->InOutSupported = FALSE;\r | |
934 | Dev->MaxTarget = 0;\r | |
935 | Dev->MaxLun = 0;\r | |
936 | Dev->MaxSectors = 0;\r | |
937 | \r | |
938 | VirtioRingUninit (&Dev->Ring);\r | |
939 | \r | |
940 | SetMem (&Dev->PassThru, sizeof Dev->PassThru, 0x00);\r | |
941 | SetMem (&Dev->PassThruMode, sizeof Dev->PassThruMode, 0x00);\r | |
942 | }\r | |
943 | \r | |
944 | \r | |
945 | //\r | |
946 | // Probe, start and stop functions of this driver, called by the DXE core for\r | |
947 | // specific devices.\r | |
948 | //\r | |
949 | // The following specifications document these interfaces:\r | |
950 | // - Driver Writer's Guide for UEFI 2.3.1 v1.01, 9 Driver Binding Protocol\r | |
951 | // - UEFI Spec 2.3.1 + Errata C, 10.1 EFI Driver Binding Protocol\r | |
952 | //\r | |
953 | // The implementation follows:\r | |
954 | // - Driver Writer's Guide for UEFI 2.3.1 v1.01\r | |
955 | // - 5.1.3.4 OpenProtocol() and CloseProtocol()\r | |
956 | // - 18 PCI Driver Design Guidelines\r | |
957 | // - 18.3 PCI drivers\r | |
958 | // - UEFI Spec 2.3.1 + Errata C\r | |
959 | // - 6.3 Protocol Handler Services\r | |
960 | // - 13.4 EFI PCI I/O Protocol\r | |
961 | //\r | |
962 | \r | |
963 | EFI_STATUS\r | |
964 | EFIAPI\r | |
965 | VirtioScsiDriverBindingSupported (\r | |
966 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
967 | IN EFI_HANDLE DeviceHandle,\r | |
968 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r | |
969 | )\r | |
970 | {\r | |
971 | EFI_STATUS Status;\r | |
972 | EFI_PCI_IO_PROTOCOL *PciIo;\r | |
973 | PCI_TYPE00 Pci;\r | |
974 | \r | |
975 | //\r | |
976 | // Attempt to open the device with the PciIo set of interfaces. On success,\r | |
977 | // the protocol is "instantiated" for the PCI device. Covers duplicate open\r | |
978 | // attempts (EFI_ALREADY_STARTED).\r | |
979 | //\r | |
980 | Status = gBS->OpenProtocol (\r | |
981 | DeviceHandle, // candidate device\r | |
982 | &gEfiPciIoProtocolGuid, // for generic PCI access\r | |
983 | (VOID **)&PciIo, // handle to instantiate\r | |
984 | This->DriverBindingHandle, // requestor driver identity\r | |
985 | DeviceHandle, // ControllerHandle, according to\r | |
986 | // the UEFI Driver Model\r | |
987 | EFI_OPEN_PROTOCOL_BY_DRIVER // get exclusive PciIo access to\r | |
988 | // the device; to be released\r | |
989 | );\r | |
990 | if (EFI_ERROR (Status)) {\r | |
991 | return Status;\r | |
992 | }\r | |
993 | \r | |
994 | //\r | |
995 | // Read entire PCI configuration header for more extensive check ahead.\r | |
996 | //\r | |
997 | Status = PciIo->Pci.Read (\r | |
998 | PciIo, // (protocol, device)\r | |
999 | // handle\r | |
1000 | EfiPciIoWidthUint32, // access width & copy\r | |
1001 | // mode\r | |
1002 | 0, // Offset\r | |
1003 | sizeof Pci / sizeof (UINT32), // Count\r | |
1004 | &Pci // target buffer\r | |
1005 | );\r | |
1006 | \r | |
1007 | if (Status == EFI_SUCCESS) {\r | |
1008 | //\r | |
1009 | // virtio-0.9.5, 2.1 PCI Discovery\r | |
1010 | //\r | |
1011 | Status = (Pci.Hdr.VendorId == 0x1AF4 &&\r | |
1012 | Pci.Hdr.DeviceId >= 0x1000 && Pci.Hdr.DeviceId <= 0x103F &&\r | |
1013 | Pci.Hdr.RevisionID == 0x00 &&\r | |
43e54972 | 1014 | Pci.Device.SubsystemID == VIRTIO_SUBSYSTEM_SCSI_HOST) ? EFI_SUCCESS : EFI_UNSUPPORTED;\r |
37078a63 | 1015 | }\r |
1016 | \r | |
1017 | //\r | |
1018 | // We needed PCI IO access only transitorily, to see whether we support the\r | |
1019 | // device or not.\r | |
1020 | //\r | |
1021 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1022 | This->DriverBindingHandle, DeviceHandle);\r | |
1023 | return Status;\r | |
1024 | }\r | |
1025 | \r | |
1026 | \r | |
1027 | EFI_STATUS\r | |
1028 | EFIAPI\r | |
1029 | VirtioScsiDriverBindingStart (\r | |
1030 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
1031 | IN EFI_HANDLE DeviceHandle,\r | |
1032 | IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r | |
1033 | )\r | |
1034 | {\r | |
1035 | VSCSI_DEV *Dev;\r | |
1036 | EFI_STATUS Status;\r | |
1037 | \r | |
1038 | Dev = (VSCSI_DEV *) AllocateZeroPool (sizeof *Dev);\r | |
1039 | if (Dev == NULL) {\r | |
1040 | return EFI_OUT_OF_RESOURCES;\r | |
1041 | }\r | |
1042 | \r | |
1043 | Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1044 | (VOID **)&Dev->PciIo, This->DriverBindingHandle,\r | |
1045 | DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);\r | |
1046 | if (EFI_ERROR (Status)) {\r | |
1047 | goto FreeVirtioScsi;\r | |
1048 | }\r | |
1049 | \r | |
1050 | //\r | |
1051 | // We must retain and ultimately restore the original PCI attributes of the\r | |
1052 | // device. See Driver Writer's Guide for UEFI 2.3.1 v1.01, 18.3 PCI drivers /\r | |
1053 | // 18.3.2 Start() and Stop().\r | |
1054 | //\r | |
1055 | // The third parameter ("Attributes", input) is ignored by the Get operation.\r | |
1056 | // The fourth parameter ("Result", output) is ignored by the Enable and Set\r | |
1057 | // operations.\r | |
1058 | //\r | |
1059 | // For virtio-scsi we only need IO space access.\r | |
1060 | //\r | |
1061 | Status = Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationGet,\r | |
1062 | 0, &Dev->OriginalPciAttributes);\r | |
1063 | if (EFI_ERROR (Status)) {\r | |
1064 | goto ClosePciIo;\r | |
1065 | }\r | |
1066 | \r | |
1067 | Status = Dev->PciIo->Attributes (Dev->PciIo,\r | |
1068 | EfiPciIoAttributeOperationEnable,\r | |
1069 | EFI_PCI_IO_ATTRIBUTE_IO, NULL);\r | |
1070 | if (EFI_ERROR (Status)) {\r | |
1071 | goto ClosePciIo;\r | |
1072 | }\r | |
1073 | \r | |
1074 | //\r | |
1075 | // PCI IO access granted, configure virtio-scsi device.\r | |
1076 | //\r | |
1077 | Status = VirtioScsiInit (Dev);\r | |
1078 | if (EFI_ERROR (Status)) {\r | |
1079 | goto RestorePciAttributes;\r | |
1080 | }\r | |
1081 | \r | |
1082 | //\r | |
1083 | // Setup complete, attempt to export the driver instance's PassThru\r | |
1084 | // interface.\r | |
1085 | //\r | |
1086 | Dev->Signature = VSCSI_SIG;\r | |
1087 | Status = gBS->InstallProtocolInterface (&DeviceHandle,\r | |
1088 | &gEfiExtScsiPassThruProtocolGuid, EFI_NATIVE_INTERFACE,\r | |
1089 | &Dev->PassThru);\r | |
1090 | if (EFI_ERROR (Status)) {\r | |
1091 | goto UninitDev;\r | |
1092 | }\r | |
1093 | \r | |
1094 | return EFI_SUCCESS;\r | |
1095 | \r | |
1096 | UninitDev:\r | |
1097 | VirtioScsiUninit (Dev);\r | |
1098 | \r | |
1099 | RestorePciAttributes:\r | |
1100 | Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,\r | |
1101 | Dev->OriginalPciAttributes, NULL);\r | |
1102 | \r | |
1103 | ClosePciIo:\r | |
1104 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1105 | This->DriverBindingHandle, DeviceHandle);\r | |
1106 | \r | |
1107 | FreeVirtioScsi:\r | |
1108 | FreePool (Dev);\r | |
1109 | \r | |
1110 | return Status;\r | |
1111 | }\r | |
1112 | \r | |
1113 | \r | |
1114 | EFI_STATUS\r | |
1115 | EFIAPI\r | |
1116 | VirtioScsiDriverBindingStop (\r | |
1117 | IN EFI_DRIVER_BINDING_PROTOCOL *This,\r | |
1118 | IN EFI_HANDLE DeviceHandle,\r | |
1119 | IN UINTN NumberOfChildren,\r | |
1120 | IN EFI_HANDLE *ChildHandleBuffer\r | |
1121 | )\r | |
1122 | {\r | |
1123 | EFI_STATUS Status;\r | |
1124 | EFI_EXT_SCSI_PASS_THRU_PROTOCOL *PassThru;\r | |
1125 | VSCSI_DEV *Dev;\r | |
1126 | \r | |
1127 | Status = gBS->OpenProtocol (\r | |
1128 | DeviceHandle, // candidate device\r | |
1129 | &gEfiExtScsiPassThruProtocolGuid, // retrieve the SCSI iface\r | |
1130 | (VOID **)&PassThru, // target pointer\r | |
1131 | This->DriverBindingHandle, // requestor driver ident.\r | |
1132 | DeviceHandle, // lookup req. for dev.\r | |
1133 | EFI_OPEN_PROTOCOL_GET_PROTOCOL // lookup only, no new ref.\r | |
1134 | );\r | |
1135 | if (EFI_ERROR (Status)) {\r | |
1136 | return Status;\r | |
1137 | }\r | |
1138 | \r | |
1139 | Dev = VIRTIO_SCSI_FROM_PASS_THRU (PassThru);\r | |
1140 | \r | |
1141 | //\r | |
1142 | // Handle Stop() requests for in-use driver instances gracefully.\r | |
1143 | //\r | |
1144 | Status = gBS->UninstallProtocolInterface (DeviceHandle,\r | |
1145 | &gEfiExtScsiPassThruProtocolGuid, &Dev->PassThru);\r | |
1146 | if (EFI_ERROR (Status)) {\r | |
1147 | return Status;\r | |
1148 | }\r | |
1149 | \r | |
1150 | VirtioScsiUninit (Dev);\r | |
1151 | \r | |
1152 | Dev->PciIo->Attributes (Dev->PciIo, EfiPciIoAttributeOperationSet,\r | |
1153 | Dev->OriginalPciAttributes, NULL);\r | |
1154 | \r | |
1155 | gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r | |
1156 | This->DriverBindingHandle, DeviceHandle);\r | |
1157 | \r | |
1158 | FreePool (Dev);\r | |
1159 | \r | |
1160 | return EFI_SUCCESS;\r | |
1161 | }\r | |
1162 | \r | |
1163 | \r | |
1164 | //\r | |
1165 | // The static object that groups the Supported() (ie. probe), Start() and\r | |
1166 | // Stop() functions of the driver together. Refer to UEFI Spec 2.3.1 + Errata\r | |
1167 | // C, 10.1 EFI Driver Binding Protocol.\r | |
1168 | //\r | |
1169 | STATIC EFI_DRIVER_BINDING_PROTOCOL gDriverBinding = {\r | |
1170 | &VirtioScsiDriverBindingSupported,\r | |
1171 | &VirtioScsiDriverBindingStart,\r | |
1172 | &VirtioScsiDriverBindingStop,\r | |
1173 | 0x10, // Version, must be in [0x10 .. 0xFFFFFFEF] for IHV-developed drivers\r | |
1174 | NULL, // ImageHandle, to be overwritten by\r | |
1175 | // EfiLibInstallDriverBindingComponentName2() in VirtioScsiEntryPoint()\r | |
1176 | NULL // DriverBindingHandle, ditto\r | |
1177 | };\r | |
1178 | \r | |
1179 | \r | |
1180 | //\r | |
1181 | // The purpose of the following scaffolding (EFI_COMPONENT_NAME_PROTOCOL and\r | |
1182 | // EFI_COMPONENT_NAME2_PROTOCOL implementation) is to format the driver's name\r | |
1183 | // in English, for display on standard console devices. This is recommended for\r | |
1184 | // UEFI drivers that follow the UEFI Driver Model. Refer to the Driver Writer's\r | |
1185 | // Guide for UEFI 2.3.1 v1.01, 11 UEFI Driver and Controller Names.\r | |
1186 | //\r | |
1187 | // Device type names ("Virtio SCSI Host Device") are not formatted because the\r | |
1188 | // driver supports only that device type. Therefore the driver name suffices\r | |
1189 | // for unambiguous identification.\r | |
1190 | //\r | |
1191 | \r | |
1192 | STATIC\r | |
1193 | EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {\r | |
1194 | { "eng;en", L"Virtio SCSI Host Driver" },\r | |
1195 | { NULL, NULL }\r | |
1196 | };\r | |
1197 | \r | |
1198 | STATIC\r | |
1199 | EFI_COMPONENT_NAME_PROTOCOL gComponentName;\r | |
1200 | \r | |
1201 | EFI_STATUS\r | |
1202 | EFIAPI\r | |
1203 | VirtioScsiGetDriverName (\r | |
1204 | IN EFI_COMPONENT_NAME_PROTOCOL *This,\r | |
1205 | IN CHAR8 *Language,\r | |
1206 | OUT CHAR16 **DriverName\r | |
1207 | )\r | |
1208 | {\r | |
1209 | return LookupUnicodeString2 (\r | |
1210 | Language,\r | |
1211 | This->SupportedLanguages,\r | |
1212 | mDriverNameTable,\r | |
1213 | DriverName,\r | |
1214 | (BOOLEAN)(This == &gComponentName) // Iso639Language\r | |
1215 | );\r | |
1216 | }\r | |
1217 | \r | |
1218 | EFI_STATUS\r | |
1219 | EFIAPI\r | |
1220 | VirtioScsiGetDeviceName (\r | |
1221 | IN EFI_COMPONENT_NAME_PROTOCOL *This,\r | |
1222 | IN EFI_HANDLE DeviceHandle,\r | |
1223 | IN EFI_HANDLE ChildHandle,\r | |
1224 | IN CHAR8 *Language,\r | |
1225 | OUT CHAR16 **ControllerName\r | |
1226 | )\r | |
1227 | {\r | |
1228 | return EFI_UNSUPPORTED;\r | |
1229 | }\r | |
1230 | \r | |
1231 | STATIC\r | |
1232 | EFI_COMPONENT_NAME_PROTOCOL gComponentName = {\r | |
1233 | &VirtioScsiGetDriverName,\r | |
1234 | &VirtioScsiGetDeviceName,\r | |
1235 | "eng" // SupportedLanguages, ISO 639-2 language codes\r | |
1236 | };\r | |
1237 | \r | |
1238 | STATIC\r | |
1239 | EFI_COMPONENT_NAME2_PROTOCOL gComponentName2 = {\r | |
1240 | (EFI_COMPONENT_NAME2_GET_DRIVER_NAME) &VirtioScsiGetDriverName,\r | |
1241 | (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) &VirtioScsiGetDeviceName,\r | |
1242 | "en" // SupportedLanguages, RFC 4646 language codes\r | |
1243 | };\r | |
1244 | \r | |
1245 | \r | |
1246 | //\r | |
1247 | // Entry point of this driver.\r | |
1248 | //\r | |
1249 | EFI_STATUS\r | |
1250 | EFIAPI\r | |
1251 | VirtioScsiEntryPoint (\r | |
1252 | IN EFI_HANDLE ImageHandle,\r | |
1253 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
1254 | )\r | |
1255 | {\r | |
1256 | return EfiLibInstallDriverBindingComponentName2 (\r | |
1257 | ImageHandle,\r | |
1258 | SystemTable,\r | |
1259 | &gDriverBinding,\r | |
1260 | ImageHandle,\r | |
1261 | &gComponentName,\r | |
1262 | &gComponentName2\r | |
1263 | );\r | |
1264 | }\r |