243 lines
6.0 KiB
C
243 lines
6.0 KiB
C
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/*
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* Copyright 2014 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs <bskeggs@redhat.com>
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*/
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#include "priv.h"
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#include <core/option.h>
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#include <subdev/bios.h>
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#include <subdev/bios/image.h>
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struct shadow {
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u32 skip;
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const struct nvbios_source *func;
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void *data;
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u32 size;
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int score;
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};
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static bool
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shadow_fetch(struct nvkm_bios *bios, struct shadow *mthd, u32 upto)
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{
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const u32 limit = (upto + 3) & ~3;
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const u32 start = bios->size;
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void *data = mthd->data;
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if (nvbios_extend(bios, limit) > 0) {
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u32 read = mthd->func->read(data, start, limit - start, bios);
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bios->size = start + read;
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}
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return bios->size >= upto;
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}
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static int
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shadow_image(struct nvkm_bios *bios, int idx, u32 offset, struct shadow *mthd)
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{
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struct nvkm_subdev *subdev = &bios->subdev;
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struct nvbios_image image;
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int score = 1;
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if (mthd->func->no_pcir) {
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image.base = 0;
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image.type = 0;
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image.size = mthd->func->size(mthd->data);
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image.last = 1;
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} else {
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if (!shadow_fetch(bios, mthd, offset + 0x1000)) {
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nvkm_debug(subdev, "%08x: header fetch failed\n",
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offset);
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return 0;
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}
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if (!nvbios_image(bios, idx, &image)) {
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nvkm_debug(subdev, "image %d invalid\n", idx);
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return 0;
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}
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}
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nvkm_debug(subdev, "%08x: type %02x, %d bytes\n",
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image.base, image.type, image.size);
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if (!shadow_fetch(bios, mthd, image.size)) {
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nvkm_debug(subdev, "%08x: fetch failed\n", image.base);
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return 0;
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}
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switch (image.type) {
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case 0x00:
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if (!mthd->func->ignore_checksum &&
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nvbios_checksum(&bios->data[image.base], image.size)) {
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nvkm_debug(subdev, "%08x: checksum failed\n",
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image.base);
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if (!mthd->func->require_checksum) {
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if (mthd->func->rw)
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score += 1;
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score += 1;
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} else
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return 0;
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} else {
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score += 3;
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}
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break;
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default:
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score += 3;
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break;
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}
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if (!image.last)
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score += shadow_image(bios, idx + 1, offset + image.size, mthd);
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return score;
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}
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static int
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shadow_method(struct nvkm_bios *bios, struct shadow *mthd, const char *name)
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{
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const struct nvbios_source *func = mthd->func;
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struct nvkm_subdev *subdev = &bios->subdev;
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if (func->name) {
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nvkm_debug(subdev, "trying %s...\n", name ? name : func->name);
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if (func->init) {
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mthd->data = func->init(bios, name);
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if (IS_ERR(mthd->data)) {
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mthd->data = NULL;
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return 0;
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}
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}
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mthd->score = shadow_image(bios, 0, 0, mthd);
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if (func->fini)
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func->fini(mthd->data);
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nvkm_debug(subdev, "scored %d\n", mthd->score);
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mthd->data = bios->data;
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mthd->size = bios->size;
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bios->data = NULL;
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bios->size = 0;
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}
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return mthd->score;
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}
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static u32
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shadow_fw_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
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{
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const struct firmware *fw = data;
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if (offset + length <= fw->size) {
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memcpy(bios->data + offset, fw->data + offset, length);
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return length;
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}
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return 0;
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}
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static void *
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shadow_fw_init(struct nvkm_bios *bios, const char *name)
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{
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struct device *dev = bios->subdev.device->dev;
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const struct firmware *fw;
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int ret = request_firmware(&fw, name, dev);
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if (ret)
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return ERR_PTR(-ENOENT);
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return (void *)fw;
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}
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static const struct nvbios_source
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shadow_fw = {
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.name = "firmware",
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.init = shadow_fw_init,
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.fini = (void(*)(void *))release_firmware,
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.read = shadow_fw_read,
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.rw = false,
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};
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int
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nvbios_shadow(struct nvkm_bios *bios)
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{
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struct nvkm_subdev *subdev = &bios->subdev;
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struct nvkm_device *device = subdev->device;
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struct shadow mthds[] = {
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{ 0, &nvbios_of },
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{ 0, &nvbios_ramin },
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{ 0, &nvbios_rom },
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{ 0, &nvbios_acpi_fast },
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{ 4, &nvbios_acpi_slow },
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{ 1, &nvbios_pcirom },
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{ 1, &nvbios_platform },
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{}
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}, *mthd, *best = NULL;
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const char *optarg;
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char *source;
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int optlen;
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/* handle user-specified bios source */
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optarg = nvkm_stropt(device->cfgopt, "NvBios", &optlen);
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source = optarg ? kstrndup(optarg, optlen, GFP_KERNEL) : NULL;
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if (source) {
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/* try to match one of the built-in methods */
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for (mthd = mthds; mthd->func; mthd++) {
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if (mthd->func->name &&
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!strcasecmp(source, mthd->func->name)) {
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best = mthd;
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if (shadow_method(bios, mthd, NULL))
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break;
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}
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}
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/* otherwise, attempt to load as firmware */
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if (!best && (best = mthd)) {
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mthd->func = &shadow_fw;
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shadow_method(bios, mthd, source);
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mthd->func = NULL;
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}
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if (!best->score) {
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nvkm_error(subdev, "%s invalid\n", source);
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kfree(source);
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source = NULL;
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}
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}
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/* scan all potential bios sources, looking for best image */
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if (!best || !best->score) {
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for (mthd = mthds, best = mthd; mthd->func; mthd++) {
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if (!mthd->skip || best->score < mthd->skip) {
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if (shadow_method(bios, mthd, NULL)) {
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if (mthd->score > best->score)
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best = mthd;
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}
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}
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}
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}
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/* cleanup the ones we didn't use */
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for (mthd = mthds; mthd->func; mthd++) {
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if (mthd != best)
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kfree(mthd->data);
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}
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if (!best->score) {
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nvkm_error(subdev, "unable to locate usable image\n");
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return -EINVAL;
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}
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nvkm_debug(subdev, "using image from %s\n", best->func ?
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best->func->name : source);
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bios->data = best->data;
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bios->size = best->size;
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kfree(source);
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return 0;
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}
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