112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
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/*
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* Copyright 2012 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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*/
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#include "priv.h"
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#if defined(CONFIG_ACPI) && defined(CONFIG_X86)
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int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len);
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bool nouveau_acpi_rom_supported(struct device *);
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#else
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static inline bool
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nouveau_acpi_rom_supported(struct device *dev)
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{
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return false;
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}
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static inline int
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nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
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{
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return -EINVAL;
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}
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#endif
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/* This version of the shadow function disobeys the ACPI spec and tries
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* to fetch in units of more than 4KiB at a time. This is a LOT faster
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* on some systems, such as Lenovo W530.
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*/
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static u32
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acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
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{
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u32 limit = (offset + length + 0xfff) & ~0xfff;
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u32 start = offset & ~0x00000fff;
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u32 fetch = limit - start;
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if (nvbios_extend(bios, limit) >= 0) {
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int ret = nouveau_acpi_get_bios_chunk(bios->data, start, fetch);
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if (ret == fetch)
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return fetch;
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}
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return 0;
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}
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/* Other systems, such as the one in fdo#55948, will report a success
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* but only return 4KiB of data. The common bios fetching logic will
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* detect an invalid image, and fall back to this version of the read
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* function.
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*/
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static u32
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acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
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{
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u32 limit = (offset + length + 0xfff) & ~0xfff;
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u32 start = offset & ~0xfff;
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u32 fetch = 0;
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if (nvbios_extend(bios, limit) >= 0) {
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while (start + fetch < limit) {
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int ret = nouveau_acpi_get_bios_chunk(bios->data,
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start + fetch,
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0x1000);
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if (ret != 0x1000)
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break;
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fetch += 0x1000;
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}
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}
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return fetch;
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}
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static void *
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acpi_init(struct nvkm_bios *bios, const char *name)
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{
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if (!nouveau_acpi_rom_supported(bios->subdev.device->dev))
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return ERR_PTR(-ENODEV);
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return NULL;
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}
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const struct nvbios_source
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nvbios_acpi_fast = {
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.name = "ACPI",
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.init = acpi_init,
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.read = acpi_read_fast,
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.rw = false,
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.require_checksum = true,
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};
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const struct nvbios_source
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nvbios_acpi_slow = {
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.name = "ACPI",
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.init = acpi_init,
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.read = acpi_read_slow,
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.rw = false,
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};
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