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1 | /** @file\r | |
2 | OVMF's instance of the PCI Host Bridge Library.\r | |
3 | \r | |
4 | Copyright (C) 2016, Red Hat, Inc.\r | |
5 | Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r | |
6 | \r | |
7 | This program and the accompanying materials are licensed and made available\r | |
8 | under the terms and conditions of the BSD License which accompanies this\r | |
9 | distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php.\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
13 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
15 | **/\r | |
16 | #include <PiDxe.h>\r | |
17 | \r | |
18 | #include <IndustryStandard/Pci.h>\r | |
19 | \r | |
20 | #include <Protocol/PciRootBridgeIo.h>\r | |
21 | \r | |
22 | #include <Library/BaseMemoryLib.h>\r | |
23 | #include <Library/DebugLib.h>\r | |
24 | #include <Library/MemoryAllocationLib.h>\r | |
25 | #include <Library/PciHostBridgeLib.h>\r | |
26 | #include <Library/PciLib.h>\r | |
27 | #include <Library/QemuFwCfgLib.h>\r | |
28 | \r | |
29 | \r | |
30 | GLOBAL_REMOVE_IF_UNREFERENCED\r | |
31 | CHAR16 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {\r | |
32 | L"Mem", L"I/O", L"Bus"\r | |
33 | };\r | |
34 | \r | |
35 | \r | |
36 | /**\r | |
37 | Initialize a PCI_ROOT_BRIDGE structure.\r | |
38 | \r | |
39 | param[in] RootBusNumber The bus number to store in RootBus.\r | |
40 | \r | |
41 | param[in] MaxSubBusNumber The inclusive maximum bus number that can be\r | |
42 | assigned to any subordinate bus found behind any\r | |
43 | PCI bridge hanging off this root bus.\r | |
44 | \r | |
45 | The caller is repsonsible for ensuring that\r | |
46 | RootBusNumber <= MaxSubBusNumber. If\r | |
47 | RootBusNumber equals MaxSubBusNumber, then the\r | |
48 | root bus has no room for subordinate buses.\r | |
49 | \r | |
50 | param[out] RootBus The PCI_ROOT_BRIDGE structure (allocated by the\r | |
51 | caller) that should be filled in by this\r | |
52 | function.\r | |
53 | \r | |
54 | @retval EFI_SUCCESS Initialization successful. A device path\r | |
55 | consisting of an ACPI device path node, with\r | |
56 | UID = RootBusNumber, has been allocated and\r | |
57 | linked into RootBus.\r | |
58 | \r | |
59 | @retval EFI_OUT_OF_RESOURCES Memory allocation failed.\r | |
60 | **/\r | |
61 | STATIC\r | |
62 | EFI_STATUS\r | |
63 | InitRootBridge (\r | |
64 | IN UINT8 RootBusNumber,\r | |
65 | IN UINT8 MaxSubBusNumber,\r | |
66 | OUT PCI_ROOT_BRIDGE *RootBus\r | |
67 | )\r | |
68 | {\r | |
69 | //\r | |
70 | // Be safe if other fields are added to PCI_ROOT_BRIDGE later.\r | |
71 | //\r | |
72 | ZeroMem (RootBus, sizeof *RootBus);\r | |
73 | \r | |
74 | RootBus->Segment = 0;\r | |
75 | \r | |
76 | RootBus->Supports = EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO |\r | |
77 | EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO |\r | |
78 | EFI_PCI_ATTRIBUTE_ISA_IO_16 |\r | |
79 | EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO |\r | |
80 | EFI_PCI_ATTRIBUTE_VGA_MEMORY |\r | |
81 | EFI_PCI_ATTRIBUTE_VGA_IO_16 |\r | |
82 | EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;\r | |
83 | RootBus->Attributes = RootBus->Supports;\r | |
84 | \r | |
85 | RootBus->DmaAbove4G = FALSE;\r | |
86 | \r | |
87 | return EFI_OUT_OF_RESOURCES;\r | |
88 | }\r | |
89 | \r | |
90 | \r | |
91 | /**\r | |
92 | Uninitialize a PCI_ROOT_BRIDGE structure set up with InitRootBridge().\r | |
93 | \r | |
94 | param[in] RootBus The PCI_ROOT_BRIDGE structure, allocated by the caller and\r | |
95 | initialized with InitRootBridge(), that should be\r | |
96 | uninitialized. This function doesn't free RootBus.\r | |
97 | **/\r | |
98 | STATIC\r | |
99 | VOID\r | |
100 | UninitRootBridge (\r | |
101 | IN PCI_ROOT_BRIDGE *RootBus\r | |
102 | )\r | |
103 | {\r | |
104 | }\r | |
105 | \r | |
106 | \r | |
107 | /**\r | |
108 | Return all the root bridge instances in an array.\r | |
109 | \r | |
110 | @param Count Return the count of root bridge instances.\r | |
111 | \r | |
112 | @return All the root bridge instances in an array.\r | |
113 | The array should be passed into PciHostBridgeFreeRootBridges()\r | |
114 | when it's not used.\r | |
115 | **/\r | |
116 | PCI_ROOT_BRIDGE *\r | |
117 | EFIAPI\r | |
118 | PciHostBridgeGetRootBridges (\r | |
119 | UINTN *Count\r | |
120 | )\r | |
121 | {\r | |
122 | EFI_STATUS Status;\r | |
123 | FIRMWARE_CONFIG_ITEM FwCfgItem;\r | |
124 | UINTN FwCfgSize;\r | |
125 | UINT64 ExtraRootBridges;\r | |
126 | PCI_ROOT_BRIDGE *Bridges;\r | |
127 | UINTN Initialized;\r | |
128 | UINTN LastRootBridgeNumber;\r | |
129 | UINTN RootBridgeNumber;\r | |
130 | \r | |
131 | *Count = 0;\r | |
132 | \r | |
133 | //\r | |
134 | // QEMU provides the number of extra root buses, shortening the exhaustive\r | |
135 | // search below. If there is no hint, the feature is missing.\r | |
136 | //\r | |
137 | Status = QemuFwCfgFindFile ("etc/extra-pci-roots", &FwCfgItem, &FwCfgSize);\r | |
138 | if (EFI_ERROR (Status) || FwCfgSize != sizeof ExtraRootBridges) {\r | |
139 | ExtraRootBridges = 0;\r | |
140 | } else {\r | |
141 | QemuFwCfgSelectItem (FwCfgItem);\r | |
142 | QemuFwCfgReadBytes (FwCfgSize, &ExtraRootBridges);\r | |
143 | \r | |
144 | if (ExtraRootBridges > PCI_MAX_BUS) {\r | |
145 | DEBUG ((EFI_D_ERROR, "%a: invalid count of extra root buses (%Lu) "\r | |
146 | "reported by QEMU\n", __FUNCTION__, ExtraRootBridges));\r | |
147 | return NULL;\r | |
148 | }\r | |
149 | DEBUG ((EFI_D_INFO, "%a: %Lu extra root buses reported by QEMU\n",\r | |
150 | __FUNCTION__, ExtraRootBridges));\r | |
151 | }\r | |
152 | \r | |
153 | //\r | |
154 | // Allocate the "main" root bridge, and any extra root bridges.\r | |
155 | //\r | |
156 | Bridges = AllocatePool ((1 + (UINTN)ExtraRootBridges) * sizeof *Bridges);\r | |
157 | if (Bridges == NULL) {\r | |
158 | DEBUG ((EFI_D_ERROR, "%a: %r\n", __FUNCTION__, EFI_OUT_OF_RESOURCES));\r | |
159 | return NULL;\r | |
160 | }\r | |
161 | Initialized = 0;\r | |
162 | \r | |
163 | //\r | |
164 | // The "main" root bus is always there.\r | |
165 | //\r | |
166 | LastRootBridgeNumber = 0;\r | |
167 | \r | |
168 | //\r | |
169 | // Scan all other root buses. If function 0 of any device on a bus returns a\r | |
170 | // VendorId register value different from all-bits-one, then that bus is\r | |
171 | // alive.\r | |
172 | //\r | |
173 | for (RootBridgeNumber = 1;\r | |
174 | RootBridgeNumber <= PCI_MAX_BUS && Initialized < ExtraRootBridges;\r | |
175 | ++RootBridgeNumber) {\r | |
176 | UINTN Device;\r | |
177 | \r | |
178 | for (Device = 0; Device <= PCI_MAX_DEVICE; ++Device) {\r | |
179 | if (PciRead16 (PCI_LIB_ADDRESS (RootBridgeNumber, Device, 0,\r | |
180 | PCI_VENDOR_ID_OFFSET)) != MAX_UINT16) {\r | |
181 | break;\r | |
182 | }\r | |
183 | }\r | |
184 | if (Device <= PCI_MAX_DEVICE) {\r | |
185 | //\r | |
186 | // Found the next root bus. We can now install the *previous* one,\r | |
187 | // because now we know how big a bus number range *that* one has, for any\r | |
188 | // subordinate buses that might exist behind PCI bridges hanging off it.\r | |
189 | //\r | |
190 | Status = InitRootBridge ((UINT8)LastRootBridgeNumber,\r | |
191 | (UINT8)(RootBridgeNumber - 1), &Bridges[Initialized]);\r | |
192 | if (EFI_ERROR (Status)) {\r | |
193 | goto FreeBridges;\r | |
194 | }\r | |
195 | ++Initialized;\r | |
196 | LastRootBridgeNumber = RootBridgeNumber;\r | |
197 | }\r | |
198 | }\r | |
199 | \r | |
200 | //\r | |
201 | // Install the last root bus (which might be the only, ie. main, root bus, if\r | |
202 | // we've found no extra root buses).\r | |
203 | //\r | |
204 | Status = InitRootBridge ((UINT8)LastRootBridgeNumber, PCI_MAX_BUS,\r | |
205 | &Bridges[Initialized]);\r | |
206 | if (EFI_ERROR (Status)) {\r | |
207 | goto FreeBridges;\r | |
208 | }\r | |
209 | ++Initialized;\r | |
210 | \r | |
211 | *Count = Initialized;\r | |
212 | return Bridges;\r | |
213 | \r | |
214 | FreeBridges:\r | |
215 | while (Initialized > 0) {\r | |
216 | --Initialized;\r | |
217 | UninitRootBridge (&Bridges[Initialized]);\r | |
218 | }\r | |
219 | \r | |
220 | FreePool (Bridges);\r | |
221 | return NULL;\r | |
222 | }\r | |
223 | \r | |
224 | \r | |
225 | /**\r | |
226 | Free the root bridge instances array returned from\r | |
227 | PciHostBridgeGetRootBridges().\r | |
228 | \r | |
229 | @param The root bridge instances array.\r | |
230 | @param The count of the array.\r | |
231 | **/\r | |
232 | VOID\r | |
233 | EFIAPI\r | |
234 | PciHostBridgeFreeRootBridges (\r | |
235 | PCI_ROOT_BRIDGE *Bridges,\r | |
236 | UINTN Count\r | |
237 | )\r | |
238 | {\r | |
239 | if (Bridges == NULL && Count == 0) {\r | |
240 | return;\r | |
241 | }\r | |
242 | ASSERT (Bridges != NULL && Count > 0);\r | |
243 | \r | |
244 | do {\r | |
245 | --Count;\r | |
246 | UninitRootBridge (&Bridges[Count]);\r | |
247 | } while (Count > 0);\r | |
248 | \r | |
249 | FreePool (Bridges);\r | |
250 | }\r | |
251 | \r | |
252 | \r | |
253 | /**\r | |
254 | Inform the platform that the resource conflict happens.\r | |
255 | \r | |
256 | @param HostBridgeHandle Handle of the Host Bridge.\r | |
257 | @param Configuration Pointer to PCI I/O and PCI memory resource\r | |
258 | descriptors. The Configuration contains the resources\r | |
259 | for all the root bridges. The resource for each root\r | |
260 | bridge is terminated with END descriptor and an\r | |
261 | additional END is appended indicating the end of the\r | |
262 | entire resources. The resource descriptor field\r | |
263 | values follow the description in\r | |
264 | EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL\r | |
265 | .SubmitResources().\r | |
266 | **/\r | |
267 | VOID\r | |
268 | EFIAPI\r | |
269 | PciHostBridgeResourceConflict (\r | |
270 | EFI_HANDLE HostBridgeHandle,\r | |
271 | VOID *Configuration\r | |
272 | )\r | |
273 | {\r | |
274 | EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;\r | |
275 | UINTN RootBridgeIndex;\r | |
276 | DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));\r | |
277 | \r | |
278 | RootBridgeIndex = 0;\r | |
279 | Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;\r | |
280 | while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {\r | |
281 | DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));\r | |
282 | for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {\r | |
283 | ASSERT (Descriptor->ResType <\r | |
284 | (sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) /\r | |
285 | sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])\r | |
286 | )\r | |
287 | );\r | |
288 | DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",\r | |
289 | mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],\r | |
290 | Descriptor->AddrLen, Descriptor->AddrRangeMax\r | |
291 | ));\r | |
292 | if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {\r | |
293 | DEBUG ((EFI_D_ERROR, " Granularity/SpecificFlag = %ld / %02x%s\n",\r | |
294 | Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,\r | |
295 | ((Descriptor->SpecificFlag &\r | |
296 | EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE\r | |
297 | ) != 0) ? L" (Prefetchable)" : L""\r | |
298 | ));\r | |
299 | }\r | |
300 | }\r | |
301 | //\r | |
302 | // Skip the END descriptor for root bridge\r | |
303 | //\r | |
304 | ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);\r | |
305 | Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(\r | |
306 | (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1\r | |
307 | );\r | |
308 | }\r | |
309 | }\r |