1 /* 2 * Copyright 2012 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 */ 23 #include "priv.h" 24 25 #include <core/device.h> 26 27 #if defined(CONFIG_ACPI) && defined(CONFIG_X86) 28 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len); 29 bool nouveau_acpi_rom_supported(struct pci_dev *pdev); 30 #else 31 static inline bool 32 nouveau_acpi_rom_supported(struct pci_dev *pdev) 33 { 34 return false; 35 } 36 37 static inline int 38 nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 39 { 40 return -EINVAL; 41 } 42 #endif 43 44 /* This version of the shadow function disobeys the ACPI spec and tries 45 * to fetch in units of more than 4KiB at a time. This is a LOT faster 46 * on some systems, such as Lenovo W530. 47 */ 48 static u32 49 acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 50 { 51 u32 limit = (offset + length + 0xfff) & ~0xfff; 52 u32 start = offset & ~0x00000fff; 53 u32 fetch = limit - start; 54 55 if (nvbios_extend(bios, limit) > 0) { 56 int ret = nouveau_acpi_get_bios_chunk(bios->data, start, fetch); 57 if (ret == fetch) 58 return fetch; 59 } 60 61 return 0; 62 } 63 64 /* Other systems, such as the one in fdo#55948, will report a success 65 * but only return 4KiB of data. The common bios fetching logic will 66 * detect an invalid image, and fall back to this version of the read 67 * function. 68 */ 69 static u32 70 acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios) 71 { 72 u32 limit = (offset + length + 0xfff) & ~0xfff; 73 u32 start = offset & ~0xfff; 74 u32 fetch = 0; 75 76 if (nvbios_extend(bios, limit) > 0) { 77 while (start + fetch < limit) { 78 int ret = nouveau_acpi_get_bios_chunk(bios->data, 79 start + fetch, 80 0x1000); 81 if (ret != 0x1000) 82 break; 83 fetch += 0x1000; 84 } 85 } 86 87 return fetch; 88 } 89 90 static void * 91 acpi_init(struct nvkm_bios *bios, const char *name) 92 { 93 if (!nouveau_acpi_rom_supported(nv_device(bios)->pdev)) 94 return ERR_PTR(-ENODEV); 95 return NULL; 96 } 97 98 const struct nvbios_source 99 nvbios_acpi_fast = { 100 .name = "ACPI", 101 .init = acpi_init, 102 .read = acpi_read_fast, 103 .rw = false, 104 }; 105 106 const struct nvbios_source 107 nvbios_acpi_slow = { 108 .name = "ACPI", 109 .init = acpi_init, 110 .read = acpi_read_slow, 111 .rw = false, 112 }; 113