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 >= limit;
  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 (!shadow_fetch(bios, mthd, offset + 0x1000)) {
  59                 nvkm_debug(subdev, "%08x: header fetch failed\n", offset);
  60                 return 0;
  61         }
  62
  63         if (!nvbios_image(bios, idx, &image)) {
  64                 nvkm_debug(subdev, "image %d invalid\n", idx);
  65                 return 0;
  66         }
  67         nvkm_debug(subdev, "%08x: type %02x, %d bytes\n",
  68                    image.base, image.type, image.size);
  69
  70         if (!shadow_fetch(bios, mthd, image.size)) {
  71                 nvkm_debug(subdev, "%08x: fetch failed\n", image.base);
  72                 return 0;
  73         }
  74
  75         switch (image.type) {
  76         case 0x00:
  77                 if (nvbios_checksum(&bios->data[image.base], image.size)) {
  78                         nvkm_debug(subdev, "%08x: checksum failed\n",
  79                                    image.base);
  80                         if (mthd->func->rw)
  81                                 score += 1;
  82                         score += 1;
  83                 } else {
  84                         score += 3;
  85                 }
  86                 break;
  87         default:
  88                 score += 3;
  89                 break;
  90         }
  91
  92         if (!image.last)
  93                 score += shadow_image(bios, idx + 1, offset + image.size, mthd);
  94         return score;
  95 }
  96
  97 static int
  98 shadow_method(struct nvkm_bios *bios, struct shadow *mthd, const char *name)
  99 {
 100         const struct nvbios_source *func = mthd->func;
 101         struct nvkm_subdev *subdev = &bios->subdev;
 102         if (func->name) {
 103                 nvkm_debug(subdev, "trying %s...\n", name ? name : func->name);
 104                 if (func->init) {
 105                         mthd->data = func->init(bios, name);
 106                         if (IS_ERR(mthd->data)) {
 107                                 mthd->data = NULL;
 108                                 return 0;
 109                         }
 110                 }
 111                 mthd->score = shadow_image(bios, 0, 0, mthd);
 112                 if (func->fini)
 113                         func->fini(mthd->data);
 114                 nvkm_debug(subdev, "scored %d\n", mthd->score);
 115                 mthd->data = bios->data;
 116                 mthd->size = bios->size;
 117                 bios->data  = NULL;
 118                 bios->size  = 0;
 119         }
 120         return mthd->score;
 121 }
 122
 123 static u32
 124 shadow_fw_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
 125 {
 126         const struct firmware *fw = data;
 127         if (offset + length <= fw->size) {
 128                 memcpy(bios->data + offset, fw->data + offset, length);
 129                 return length;
 130         }
 131         return 0;
 132 }
 133
 134 static void *
 135 shadow_fw_init(struct nvkm_bios *bios, const char *name)
 136 {
 137         struct device *dev = &nv_device(bios)->pdev->dev;
 138         const struct firmware *fw;
 139         int ret = request_firmware(&fw, name, dev);
 140         if (ret)
 141                 return ERR_PTR(-ENOENT);
 142         return (void *)fw;
 143 }
 144
 145 static const struct nvbios_source
 146 shadow_fw = {
 147         .name = "firmware",
 148         .init = shadow_fw_init,
 149         .fini = (void(*)(void *))release_firmware,
 150         .read = shadow_fw_read,
 151         .rw = false,
 152 };
 153
 154 int
 155 nvbios_shadow(struct nvkm_bios *bios)
 156 {
 157         struct nvkm_subdev *subdev = &bios->subdev;
 158         struct nvkm_device *device = subdev->device;
 159         struct shadow mthds[] = {
 160                 { 0, &nvbios_of },
 161                 { 0, &nvbios_ramin },
 162                 { 0, &nvbios_rom },
 163                 { 0, &nvbios_acpi_fast },
 164                 { 4, &nvbios_acpi_slow },
 165                 { 1, &nvbios_pcirom },
 166                 { 1, &nvbios_platform },
 167                 {}
 168         }, *mthd, *best = NULL;
 169         const char *optarg;
 170         char *source;
 171         int optlen;
 172
 173         /* handle user-specified bios source */
 174         optarg = nvkm_stropt(device->cfgopt, "NvBios", &optlen);
 175         source = optarg ? kstrndup(optarg, optlen, GFP_KERNEL) : NULL;
 176         if (source) {
 177                 /* try to match one of the built-in methods */
 178                 for (mthd = mthds; mthd->func; mthd++) {
 179                         if (mthd->func->name &&
 180                             !strcasecmp(source, mthd->func->name)) {
 181                                 best = mthd;
 182                                 if (shadow_method(bios, mthd, NULL))
 183                                         break;
 184                         }
 185                 }
 186
 187                 /* otherwise, attempt to load as firmware */
 188                 if (!best && (best = mthd)) {
 189                         mthd->func = &shadow_fw;
 190                         shadow_method(bios, mthd, source);
 191                         mthd->func = NULL;
 192                 }
 193
 194                 if (!best->score) {
 195                         nvkm_error(subdev, "%s invalid\n", source);
 196                         kfree(source);
 197                         source = NULL;
 198                 }
 199         }
 200
 201         /* scan all potential bios sources, looking for best image */
 202         if (!best || !best->score) {
 203                 for (mthd = mthds, best = mthd; mthd->func; mthd++) {
 204                         if (!mthd->skip || best->score < mthd->skip) {
 205                                 if (shadow_method(bios, mthd, NULL)) {
 206                                         if (mthd->score > best->score)
 207                                                 best = mthd;
 208                                 }
 209                         }
 210                 }
 211         }
 212
 213         /* cleanup the ones we didn't use */
 214         for (mthd = mthds; mthd->func; mthd++) {
 215                 if (mthd != best)
 216                         kfree(mthd->data);
 217         }
 218
 219         if (!best->score) {
 220                 nvkm_error(subdev, "unable to locate usable image\n");
 221                 return -EINVAL;
 222         }
 223
 224         nvkm_debug(subdev, "using image from %s\n", best->func ?
 225                    best->func->name : source);
 226         bios->data = best->data;
 227         bios->size = best->size;
 228         kfree(source);
 229         return 0;
 230 }