drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadow.c

   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
  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
  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->rw)
  90                                 score += 1;
  91                         score += 1;
  92                 } else {
  93                         score += 3;
  94                 }
  95                 break;
  96         default:
  97                 score += 3;
  98                 break;
  99         }
 100
 101         if (!image.last)
 102                 score += shadow_image(bios, idx + 1, offset + image.size, mthd);
 103         return score;
 104 }
 105
 106 static int
 107 shadow_method(struct nvkm_bios *bios, struct shadow *mthd, const char *name)
 108 {
 109         const struct nvbios_source *func = mthd->func;
 110         struct nvkm_subdev *subdev = &bios->subdev;
 111         if (func->name) {
 112                 nvkm_debug(subdev, "trying %s...\n", name ? name : func->name);
 113                 if (func->init) {
 114                         mthd->data = func->init(bios, name);
 115                         if (IS_ERR(mthd->data)) {
 116                                 mthd->data = NULL;
 117                                 return 0;
 118                         }
 119                 }
 120                 mthd->score = shadow_image(bios, 0, 0, mthd);
 121                 if (func->fini)
 122                         func->fini(mthd->data);
 123                 nvkm_debug(subdev, "scored %d\n", mthd->score);
 124                 mthd->data = bios->data;
 125                 mthd->size = bios->size;
 126                 bios->data  = NULL;
 127                 bios->size  = 0;
 128         }
 129         return mthd->score;
 130 }
 131
 132 static u32
 133 shadow_fw_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
 134 {
 135         const struct firmware *fw = data;
 136         if (offset + length <= fw->size) {
 137                 memcpy(bios->data + offset, fw->data + offset, length);
 138                 return length;
 139         }
 140         return 0;
 141 }
 142
 143 static void *
 144 shadow_fw_init(struct nvkm_bios *bios, const char *name)
 145 {
 146         struct device *dev = bios->subdev.device->dev;
 147         const struct firmware *fw;
 148         int ret = request_firmware(&fw, name, dev);
 149         if (ret)
 150                 return ERR_PTR(-ENOENT);
 151         return (void *)fw;
 152 }
 153
 154 static const struct nvbios_source
 155 shadow_fw = {
 156         .name = "firmware",
 157         .init = shadow_fw_init,
 158         .fini = (void(*)(void *))release_firmware,
 159         .read = shadow_fw_read,
 160         .rw = false,
 161 };
 162
 163 int
 164 nvbios_shadow(struct nvkm_bios *bios)
 165 {
 166         struct nvkm_subdev *subdev = &bios->subdev;
 167         struct nvkm_device *device = subdev->device;
 168         struct shadow mthds[] = {
 169                 { 0, &nvbios_of },
 170                 { 0, &nvbios_ramin },
 171                 { 0, &nvbios_rom },
 172                 { 0, &nvbios_acpi_fast },
 173                 { 4, &nvbios_acpi_slow },
 174                 { 1, &nvbios_pcirom },
 175                 { 1, &nvbios_platform },
 176                 {}
 177         }, *mthd, *best = NULL;
 178         const char *optarg;
 179         char *source;
 180         int optlen;
 181
 182         /* handle user-specified bios source */
 183         optarg = nvkm_stropt(device->cfgopt, "NvBios", &optlen);
 184         source = optarg ? kstrndup(optarg, optlen, GFP_KERNEL) : NULL;
 185         if (source) {
 186                 /* try to match one of the built-in methods */
 187                 for (mthd = mthds; mthd->func; mthd++) {
 188                         if (mthd->func->name &&
 189                             !strcasecmp(source, mthd->func->name)) {
 190                                 best = mthd;
 191                                 if (shadow_method(bios, mthd, NULL))
 192                                         break;
 193                         }
 194                 }
 195
 196                 /* otherwise, attempt to load as firmware */
 197                 if (!best && (best = mthd)) {
 198                         mthd->func = &shadow_fw;
 199                         shadow_method(bios, mthd, source);
 200                         mthd->func = NULL;
 201                 }
 202
 203                 if (!best->score) {
 204                         nvkm_error(subdev, "%s invalid\n", source);
 205                         kfree(source);
 206                         source = NULL;
 207                 }
 208         }
 209
 210         /* scan all potential bios sources, looking for best image */
 211         if (!best || !best->score) {
 212                 for (mthd = mthds, best = mthd; mthd->func; mthd++) {
 213                         if (!mthd->skip || best->score < mthd->skip) {
 214                                 if (shadow_method(bios, mthd, NULL)) {
 215                                         if (mthd->score > best->score)
 216                                                 best = mthd;
 217                                 }
 218                         }
 219                 }
 220         }
 221
 222         /* cleanup the ones we didn't use */
 223         for (mthd = mthds; mthd->func; mthd++) {
 224                 if (mthd != best)
 225                         kfree(mthd->data);
 226         }
 227
 228         if (!best->score) {
 229                 nvkm_error(subdev, "unable to locate usable image\n");
 230                 return -EINVAL;
 231         }
 232
 233         nvkm_debug(subdev, "using image from %s\n", best->func ?
 234                    best->func->name : source);
 235         bios->data = best->data;
 236         bios->size = best->size;
 237         kfree(source);
 238         return 0;
 239 }