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