1 /*
2 * Copyright 2014 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs <bskeggs@redhat.com>
23 */
24 #include "priv.h"
25
26 #include <core/option.h>
27 #include <subdev/bios.h>
28 #include <subdev/bios/image.h>
29
30 struct shadow {
31 u32 skip;
32 const struct nvbios_source *func;
33 void *data;
34 u32 size;
35 int score;
36 };
37
38 static bool
shadow_fetch(struct nvkm_bios * bios,struct shadow * mthd,u32 upto)39 shadow_fetch(struct nvkm_bios *bios, struct shadow *mthd, u32 upto)
40 {
41 const u32 limit = (upto + 3) & ~3;
42 const u32 start = bios->size;
43 void *data = mthd->data;
44 if (nvbios_extend(bios, limit) > 0) {
45 u32 read = mthd->func->read(data, start, limit - start, bios);
46 bios->size = start + read;
47 }
48 return bios->size >= upto;
49 }
50
51 static int
shadow_image(struct nvkm_bios * bios,int idx,u32 offset,struct shadow * mthd)52 shadow_image(struct nvkm_bios *bios, int idx, u32 offset, struct shadow *mthd)
53 {
54 struct nvkm_subdev *subdev = &bios->subdev;
55 struct nvbios_image image;
56 int score = 1;
57
58 if (mthd->func->no_pcir) {
59 image.base = 0;
60 image.type = 0;
61 image.size = mthd->func->size(mthd->data);
62 image.last = 1;
63 } else {
64 if (!shadow_fetch(bios, mthd, offset + 0x1000)) {
65 nvkm_debug(subdev, "%08x: header fetch failed\n",
66 offset);
67 return 0;
68 }
69
70 if (!nvbios_image(bios, idx, &image)) {
71 nvkm_debug(subdev, "image %d invalid\n", idx);
72 return 0;
73 }
74 }
75 nvkm_debug(subdev, "%08x: type %02x, %d bytes\n",
76 image.base, image.type, image.size);
77
78 if (!shadow_fetch(bios, mthd, image.size)) {
79 nvkm_debug(subdev, "%08x: fetch failed\n", image.base);
80 return 0;
81 }
82
83 switch (image.type) {
84 case 0x00:
85 if (!mthd->func->ignore_checksum &&
86 nvbios_checksum(&bios->data[image.base], image.size)) {
87 nvkm_debug(subdev, "%08x: checksum failed\n",
88 image.base);
89 if (!mthd->func->require_checksum) {
90 if (mthd->func->rw)
91 score += 1;
92 score += 1;
93 } else
94 return 0;
95 } else {
96 score += 3;
97 }
98 break;
99 default:
100 score += 3;
101 break;
102 }
103
104 if (!image.last)
105 score += shadow_image(bios, idx + 1, offset + image.size, mthd);
106 return score;
107 }
108
109 static int
shadow_method(struct nvkm_bios * bios,struct shadow * mthd,const char * name)110 shadow_method(struct nvkm_bios *bios, struct shadow *mthd, const char *name)
111 {
112 const struct nvbios_source *func = mthd->func;
113 struct nvkm_subdev *subdev = &bios->subdev;
114 if (func->name) {
115 nvkm_debug(subdev, "trying %s...\n", name ? name : func->name);
116 if (func->init) {
117 mthd->data = func->init(bios, name);
118 if (IS_ERR(mthd->data)) {
119 mthd->data = NULL;
120 return 0;
121 }
122 }
123 mthd->score = shadow_image(bios, 0, 0, mthd);
124 if (func->fini)
125 func->fini(mthd->data);
126 nvkm_debug(subdev, "scored %d\n", mthd->score);
127 mthd->data = bios->data;
128 mthd->size = bios->size;
129 bios->data = NULL;
130 bios->size = 0;
131 }
132 return mthd->score;
133 }
134
135 static u32
shadow_fw_read(void * data,u32 offset,u32 length,struct nvkm_bios * bios)136 shadow_fw_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
137 {
138 const struct firmware *fw = data;
139 if (offset + length <= fw->size) {
140 memcpy(bios->data + offset, fw->data + offset, length);
141 return length;
142 }
143 return 0;
144 }
145
146 static void *
shadow_fw_init(struct nvkm_bios * bios,const char * name)147 shadow_fw_init(struct nvkm_bios *bios, const char *name)
148 {
149 struct device *dev = bios->subdev.device->dev;
150 const struct firmware *fw;
151 int ret = request_firmware(&fw, name, dev);
152 if (ret)
153 return ERR_PTR(-ENOENT);
154 return (void *)fw;
155 }
156
157 static const struct nvbios_source
158 shadow_fw = {
159 .name = "firmware",
160 .init = shadow_fw_init,
161 .fini = (void(*)(void *))release_firmware,
162 .read = shadow_fw_read,
163 .rw = false,
164 };
165
166 int
nvbios_shadow(struct nvkm_bios * bios)167 nvbios_shadow(struct nvkm_bios *bios)
168 {
169 struct nvkm_subdev *subdev = &bios->subdev;
170 struct nvkm_device *device = subdev->device;
171 struct shadow mthds[] = {
172 { 0, &nvbios_of },
173 { 0, &nvbios_ramin },
174 { 0, &nvbios_rom },
175 { 0, &nvbios_acpi_fast },
176 { 4, &nvbios_acpi_slow },
177 { 1, &nvbios_pcirom },
178 { 1, &nvbios_platform },
179 {}
180 }, *mthd, *best = NULL;
181 const char *optarg;
182 char *source;
183 int optlen;
184
185 /* handle user-specified bios source */
186 optarg = nvkm_stropt(device->cfgopt, "NvBios", &optlen);
187 source = optarg ? kstrndup(optarg, optlen, GFP_KERNEL) : NULL;
188 if (source) {
189 /* try to match one of the built-in methods */
190 for (mthd = mthds; mthd->func; mthd++) {
191 if (mthd->func->name &&
192 !strcasecmp(source, mthd->func->name)) {
193 best = mthd;
194 if (shadow_method(bios, mthd, NULL))
195 break;
196 }
197 }
198
199 /* otherwise, attempt to load as firmware */
200 if (!best && (best = mthd)) {
201 mthd->func = &shadow_fw;
202 shadow_method(bios, mthd, source);
203 mthd->func = NULL;
204 }
205
206 if (!best->score) {
207 nvkm_error(subdev, "%s invalid\n", source);
208 kfree(source);
209 source = NULL;
210 }
211 }
212
213 /* scan all potential bios sources, looking for best image */
214 if (!best || !best->score) {
215 for (mthd = mthds, best = mthd; mthd->func; mthd++) {
216 if (!mthd->skip || best->score < mthd->skip) {
217 if (shadow_method(bios, mthd, NULL)) {
218 if (mthd->score > best->score)
219 best = mthd;
220 }
221 }
222 }
223 }
224
225 /* cleanup the ones we didn't use */
226 for (mthd = mthds; mthd->func; mthd++) {
227 if (mthd != best)
228 kfree(mthd->data);
229 }
230
231 if (!best->score) {
232 nvkm_error(subdev, "unable to locate usable image\n");
233 return -EINVAL;
234 }
235
236 nvkm_debug(subdev, "using image from %s\n", best->func ?
237 best->func->name : source);
238 bios->data = best->data;
239 bios->size = best->size;
240 kfree(source);
241 return 0;
242 }
243
