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8f35eb92 LE |
1 | /** @file\r |
2 | Temporarily enable IO and MMIO decoding for all PCI devices while QEMU\r | |
3 | regenerates the ACPI tables.\r | |
4 | \r | |
5 | Copyright (C) 2016, Red Hat, Inc.\r | |
6 | \r | |
b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
8f35eb92 LE |
8 | **/\r |
9 | \r | |
cc302b79 LE |
10 | #include <Library/DebugLib.h> // DEBUG()\r |
11 | #include <Library/MemoryAllocationLib.h> // AllocatePool()\r | |
12 | #include <Library/UefiBootServicesTableLib.h> // gBS\r | |
8f35eb92 LE |
13 | \r |
14 | #include "AcpiPlatform.h"\r | |
15 | \r | |
8f35eb92 LE |
16 | /**\r |
17 | Collect all PciIo protocol instances in the system. Save their original\r | |
18 | attributes, and enable IO and MMIO decoding for each.\r | |
19 | \r | |
20 | This is a best effort function; it doesn't return status codes. Its\r | |
21 | caller is supposed to proceed even if this function fails.\r | |
22 | \r | |
23 | @param[out] OriginalAttributes On output, a dynamically allocated array of\r | |
24 | ORIGINAL_ATTRIBUTES elements. The array lists\r | |
25 | the PciIo protocol instances found in the\r | |
26 | system at the time of the call, plus the\r | |
27 | original PCI attributes for each.\r | |
28 | \r | |
29 | Before returning, the function enables IO and\r | |
30 | MMIO decoding for each PciIo instance it\r | |
31 | finds.\r | |
32 | \r | |
33 | On error, or when no such instances are\r | |
34 | found, OriginalAttributes is set to NULL.\r | |
35 | \r | |
36 | @param[out] Count On output, the number of elements in\r | |
37 | OriginalAttributes. On error it is set to\r | |
38 | zero.\r | |
39 | **/\r | |
40 | VOID\r | |
41 | EnablePciDecoding (\r | |
ac0a286f MK |
42 | OUT ORIGINAL_ATTRIBUTES **OriginalAttributes,\r |
43 | OUT UINTN *Count\r | |
8f35eb92 LE |
44 | )\r |
45 | {\r | |
ac0a286f MK |
46 | EFI_STATUS Status;\r |
47 | UINTN NoHandles;\r | |
48 | EFI_HANDLE *Handles;\r | |
49 | ORIGINAL_ATTRIBUTES *OrigAttrs;\r | |
50 | UINTN Idx;\r | |
8f35eb92 LE |
51 | \r |
52 | *OriginalAttributes = NULL;\r | |
53 | *Count = 0;\r | |
54 | \r | |
55 | if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r | |
56 | //\r | |
57 | // The platform downloads ACPI tables from QEMU in general, but there are\r | |
58 | // no root bridges in this execution. We're done.\r | |
59 | //\r | |
60 | return;\r | |
61 | }\r | |
62 | \r | |
ac0a286f MK |
63 | Status = gBS->LocateHandleBuffer (\r |
64 | ByProtocol,\r | |
65 | &gEfiPciIoProtocolGuid,\r | |
66 | NULL /* SearchKey */,\r | |
67 | &NoHandles,\r | |
68 | &Handles\r | |
69 | );\r | |
8f35eb92 LE |
70 | if (Status == EFI_NOT_FOUND) {\r |
71 | //\r | |
72 | // No PCI devices were found on either of the root bridges. We're done.\r | |
73 | //\r | |
74 | return;\r | |
75 | }\r | |
76 | \r | |
77 | if (EFI_ERROR (Status)) {\r | |
ac0a286f MK |
78 | DEBUG ((\r |
79 | DEBUG_WARN,\r | |
80 | "%a: LocateHandleBuffer(): %r\n",\r | |
81 | __FUNCTION__,\r | |
82 | Status\r | |
83 | ));\r | |
8f35eb92 LE |
84 | return;\r |
85 | }\r | |
86 | \r | |
87 | OrigAttrs = AllocatePool (NoHandles * sizeof *OrigAttrs);\r | |
88 | if (OrigAttrs == NULL) {\r | |
ac0a286f MK |
89 | DEBUG ((\r |
90 | DEBUG_WARN,\r | |
91 | "%a: AllocatePool(): out of resources\n",\r | |
92 | __FUNCTION__\r | |
93 | ));\r | |
8f35eb92 LE |
94 | goto FreeHandles;\r |
95 | }\r | |
96 | \r | |
97 | for (Idx = 0; Idx < NoHandles; ++Idx) {\r | |
ac0a286f MK |
98 | EFI_PCI_IO_PROTOCOL *PciIo;\r |
99 | UINT64 Attributes;\r | |
8f35eb92 LE |
100 | \r |
101 | //\r | |
102 | // Look up PciIo on the handle and stash it\r | |
103 | //\r | |
ac0a286f MK |
104 | Status = gBS->HandleProtocol (\r |
105 | Handles[Idx],\r | |
106 | &gEfiPciIoProtocolGuid,\r | |
107 | (VOID **)&PciIo\r | |
108 | );\r | |
8f35eb92 LE |
109 | ASSERT_EFI_ERROR (Status);\r |
110 | OrigAttrs[Idx].PciIo = PciIo;\r | |
111 | \r | |
112 | //\r | |
113 | // Stash the current attributes\r | |
114 | //\r | |
ac0a286f MK |
115 | Status = PciIo->Attributes (\r |
116 | PciIo,\r | |
117 | EfiPciIoAttributeOperationGet,\r | |
118 | 0,\r | |
119 | &OrigAttrs[Idx].PciAttributes\r | |
120 | );\r | |
8f35eb92 | 121 | if (EFI_ERROR (Status)) {\r |
ac0a286f MK |
122 | DEBUG ((\r |
123 | DEBUG_WARN,\r | |
124 | "%a: EfiPciIoAttributeOperationGet: %r\n",\r | |
125 | __FUNCTION__,\r | |
126 | Status\r | |
127 | ));\r | |
8f35eb92 LE |
128 | goto RestoreAttributes;\r |
129 | }\r | |
130 | \r | |
90bb4c57 VR |
131 | //\r |
132 | // Retrieve supported attributes\r | |
133 | //\r | |
ac0a286f MK |
134 | Status = PciIo->Attributes (\r |
135 | PciIo,\r | |
136 | EfiPciIoAttributeOperationSupported,\r | |
137 | 0,\r | |
138 | &Attributes\r | |
139 | );\r | |
90bb4c57 | 140 | if (EFI_ERROR (Status)) {\r |
ac0a286f MK |
141 | DEBUG ((\r |
142 | DEBUG_WARN,\r | |
143 | "%a: EfiPciIoAttributeOperationSupported: %r\n",\r | |
144 | __FUNCTION__,\r | |
145 | Status\r | |
146 | ));\r | |
90bb4c57 VR |
147 | goto RestoreAttributes;\r |
148 | }\r | |
149 | \r | |
8f35eb92 LE |
150 | //\r |
151 | // Enable IO and MMIO decoding\r | |
152 | //\r | |
90bb4c57 | 153 | Attributes &= EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY;\r |
ac0a286f MK |
154 | Status = PciIo->Attributes (\r |
155 | PciIo,\r | |
156 | EfiPciIoAttributeOperationEnable,\r | |
157 | Attributes,\r | |
158 | NULL\r | |
159 | );\r | |
8f35eb92 | 160 | if (EFI_ERROR (Status)) {\r |
ac0a286f MK |
161 | DEBUG ((\r |
162 | DEBUG_WARN,\r | |
163 | "%a: EfiPciIoAttributeOperationEnable: %r\n",\r | |
164 | __FUNCTION__,\r | |
165 | Status\r | |
166 | ));\r | |
8f35eb92 LE |
167 | goto RestoreAttributes;\r |
168 | }\r | |
169 | }\r | |
170 | \r | |
171 | //\r | |
172 | // Success\r | |
173 | //\r | |
174 | FreePool (Handles);\r | |
175 | *OriginalAttributes = OrigAttrs;\r | |
176 | *Count = NoHandles;\r | |
177 | return;\r | |
178 | \r | |
179 | RestoreAttributes:\r | |
180 | while (Idx > 0) {\r | |
181 | --Idx;\r | |
ac0a286f MK |
182 | OrigAttrs[Idx].PciIo->Attributes (\r |
183 | OrigAttrs[Idx].PciIo,\r | |
8f35eb92 LE |
184 | EfiPciIoAttributeOperationSet,\r |
185 | OrigAttrs[Idx].PciAttributes,\r | |
186 | NULL\r | |
187 | );\r | |
188 | }\r | |
ac0a286f | 189 | \r |
8f35eb92 LE |
190 | FreePool (OrigAttrs);\r |
191 | \r | |
192 | FreeHandles:\r | |
193 | FreePool (Handles);\r | |
194 | }\r | |
195 | \r | |
8f35eb92 LE |
196 | /**\r |
197 | Restore the original PCI attributes saved with EnablePciDecoding().\r | |
198 | \r | |
199 | @param[in] OriginalAttributes The array allocated and populated by\r | |
200 | EnablePciDecoding(). This parameter may be\r | |
201 | NULL. If OriginalAttributes is NULL, then the\r | |
202 | function is a no-op; otherwise the PciIo\r | |
203 | attributes will be restored, and the\r | |
204 | OriginalAttributes array will be freed.\r | |
205 | \r | |
206 | @param[in] Count The Count value stored by EnablePciDecoding(),\r | |
207 | the number of elements in OriginalAttributes.\r | |
208 | Count may be zero if and only if\r | |
209 | OriginalAttributes is NULL.\r | |
210 | **/\r | |
211 | VOID\r | |
212 | RestorePciDecoding (\r | |
ac0a286f MK |
213 | IN ORIGINAL_ATTRIBUTES *OriginalAttributes,\r |
214 | IN UINTN Count\r | |
8f35eb92 LE |
215 | )\r |
216 | {\r | |
ac0a286f | 217 | UINTN Idx;\r |
8f35eb92 LE |
218 | \r |
219 | ASSERT ((OriginalAttributes == NULL) == (Count == 0));\r | |
220 | if (OriginalAttributes == NULL) {\r | |
221 | return;\r | |
222 | }\r | |
223 | \r | |
224 | for (Idx = 0; Idx < Count; ++Idx) {\r | |
225 | OriginalAttributes[Idx].PciIo->Attributes (\r | |
226 | OriginalAttributes[Idx].PciIo,\r | |
227 | EfiPciIoAttributeOperationSet,\r | |
228 | OriginalAttributes[Idx].PciAttributes,\r | |
229 | NULL\r | |
230 | );\r | |
231 | }\r | |
ac0a286f | 232 | \r |
8f35eb92 LE |
233 | FreePool (OriginalAttributes);\r |
234 | }\r |