--- zzzz-none-000/linux-3.10.107/drivers/firmware/efi/efi.c 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/drivers/firmware/efi/efi.c 2021-02-04 17:41:59.000000000 +0000 @@ -13,14 +13,68 @@ * This file is released under the GPLv2. */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include #include #include #include #include +#include +#include +#include +#include + +struct efi __read_mostly efi = { + .mps = EFI_INVALID_TABLE_ADDR, + .acpi = EFI_INVALID_TABLE_ADDR, + .acpi20 = EFI_INVALID_TABLE_ADDR, + .smbios = EFI_INVALID_TABLE_ADDR, + .smbios3 = EFI_INVALID_TABLE_ADDR, + .sal_systab = EFI_INVALID_TABLE_ADDR, + .boot_info = EFI_INVALID_TABLE_ADDR, + .hcdp = EFI_INVALID_TABLE_ADDR, + .uga = EFI_INVALID_TABLE_ADDR, + .uv_systab = EFI_INVALID_TABLE_ADDR, + .fw_vendor = EFI_INVALID_TABLE_ADDR, + .runtime = EFI_INVALID_TABLE_ADDR, + .config_table = EFI_INVALID_TABLE_ADDR, + .esrt = EFI_INVALID_TABLE_ADDR, + .properties_table = EFI_INVALID_TABLE_ADDR, +}; +EXPORT_SYMBOL(efi); + +static bool disable_runtime; +static int __init setup_noefi(char *arg) +{ + disable_runtime = true; + return 0; +} +early_param("noefi", setup_noefi); + +bool efi_runtime_disabled(void) +{ + return disable_runtime; +} + +static int __init parse_efi_cmdline(char *str) +{ + if (!str) { + pr_warn("need at least one option\n"); + return -EINVAL; + } + + if (parse_option_str(str, "debug")) + set_bit(EFI_DBG, &efi.flags); + + if (parse_option_str(str, "noruntime")) + disable_runtime = true; + + return 0; +} +early_param("efi", parse_efi_cmdline); -static struct kobject *efi_kobj; -static struct kobject *efivars_kobj; +struct kobject *efi_kobj; /* * Let's not leave out systab information that snuck into @@ -40,6 +94,13 @@ str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); if (efi.acpi != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); + /* + * If both SMBIOS and SMBIOS3 entry points are implemented, the + * SMBIOS3 entry point shall be preferred, so we list it first to + * let applications stop parsing after the first match. + */ + if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3); if (efi.smbios != EFI_INVALID_TABLE_ADDR) str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); if (efi.hcdp != EFI_INVALID_TABLE_ADDR) @@ -55,13 +116,61 @@ static struct kobj_attribute efi_attr_systab = __ATTR(systab, 0400, systab_show, NULL); +#define EFI_FIELD(var) efi.var + +#define EFI_ATTR_SHOW(name) \ +static ssize_t name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf) \ +{ \ + return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \ +} + +EFI_ATTR_SHOW(fw_vendor); +EFI_ATTR_SHOW(runtime); +EFI_ATTR_SHOW(config_table); + +static ssize_t fw_platform_size_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32); +} + +static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor); +static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime); +static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table); +static struct kobj_attribute efi_attr_fw_platform_size = + __ATTR_RO(fw_platform_size); + static struct attribute *efi_subsys_attrs[] = { &efi_attr_systab.attr, - NULL, /* maybe more in the future? */ + &efi_attr_fw_vendor.attr, + &efi_attr_runtime.attr, + &efi_attr_config_table.attr, + &efi_attr_fw_platform_size.attr, + NULL, }; +static umode_t efi_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + if (attr == &efi_attr_fw_vendor.attr) { + if (efi_enabled(EFI_PARAVIRT) || + efi.fw_vendor == EFI_INVALID_TABLE_ADDR) + return 0; + } else if (attr == &efi_attr_runtime.attr) { + if (efi.runtime == EFI_INVALID_TABLE_ADDR) + return 0; + } else if (attr == &efi_attr_config_table.attr) { + if (efi.config_table == EFI_INVALID_TABLE_ADDR) + return 0; + } + + return attr->mode; +} + static struct attribute_group efi_subsys_attr_group = { .attrs = efi_subsys_attrs, + .is_visible = efi_attr_is_visible, }; static struct efivars generic_efivars; @@ -71,6 +180,7 @@ { generic_ops.get_variable = efi.get_variable; generic_ops.set_variable = efi.set_variable; + generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; generic_ops.get_next_variable = efi.get_next_variable; generic_ops.query_variable_store = efi_query_variable_store; @@ -112,11 +222,14 @@ goto err_unregister; } + error = efi_runtime_map_init(efi_kobj); + if (error) + goto err_remove_group; + /* and the standard mountpoint for efivarfs */ - efivars_kobj = kobject_create_and_add("efivars", efi_kobj); - if (!efivars_kobj) { + error = sysfs_create_mount_point(efi_kobj, "efivars"); + if (error) { pr_err("efivars: Subsystem registration failed.\n"); - error = -ENOMEM; goto err_remove_group; } @@ -132,3 +245,421 @@ } subsys_initcall(efisubsys_init); + +/* + * Find the efi memory descriptor for a given physical address. Given a + * physicall address, determine if it exists within an EFI Memory Map entry, + * and if so, populate the supplied memory descriptor with the appropriate + * data. + */ +int __init efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) +{ + struct efi_memory_map *map = efi.memmap; + phys_addr_t p, e; + + if (!efi_enabled(EFI_MEMMAP)) { + pr_err_once("EFI_MEMMAP is not enabled.\n"); + return -EINVAL; + } + + if (!map) { + pr_err_once("efi.memmap is not set.\n"); + return -EINVAL; + } + if (!out_md) { + pr_err_once("out_md is null.\n"); + return -EINVAL; + } + if (WARN_ON_ONCE(!map->phys_map)) + return -EINVAL; + if (WARN_ON_ONCE(map->nr_map == 0) || WARN_ON_ONCE(map->desc_size == 0)) + return -EINVAL; + + e = map->phys_map + map->nr_map * map->desc_size; + for (p = map->phys_map; p < e; p += map->desc_size) { + efi_memory_desc_t *md; + u64 size; + u64 end; + + /* + * If a driver calls this after efi_free_boot_services, + * ->map will be NULL, and the target may also not be mapped. + * So just always get our own virtual map on the CPU. + * + */ + md = early_memremap(p, sizeof (*md)); + if (!md) { + pr_err_once("early_memremap(%pa, %zu) failed.\n", + &p, sizeof (*md)); + return -ENOMEM; + } + + if (!(md->attribute & EFI_MEMORY_RUNTIME) && + md->type != EFI_BOOT_SERVICES_DATA && + md->type != EFI_RUNTIME_SERVICES_DATA) { + early_memunmap(md, sizeof (*md)); + continue; + } + + size = md->num_pages << EFI_PAGE_SHIFT; + end = md->phys_addr + size; + if (phys_addr >= md->phys_addr && phys_addr < end) { + memcpy(out_md, md, sizeof(*out_md)); + early_memunmap(md, sizeof (*md)); + return 0; + } + + early_memunmap(md, sizeof (*md)); + } + pr_err_once("requested map not found.\n"); + return -ENOENT; +} + +/* + * Calculate the highest address of an efi memory descriptor. + */ +u64 __init efi_mem_desc_end(efi_memory_desc_t *md) +{ + u64 size = md->num_pages << EFI_PAGE_SHIFT; + u64 end = md->phys_addr + size; + return end; +} + +/* + * We can't ioremap data in EFI boot services RAM, because we've already mapped + * it as RAM. So, look it up in the existing EFI memory map instead. Only + * callable after efi_enter_virtual_mode and before efi_free_boot_services. + */ +void __iomem *efi_lookup_mapped_addr(u64 phys_addr) +{ + struct efi_memory_map *map; + void *p; + map = efi.memmap; + if (!map) + return NULL; + if (WARN_ON(!map->map)) + return NULL; + for (p = map->map; p < map->map_end; p += map->desc_size) { + efi_memory_desc_t *md = p; + u64 size = md->num_pages << EFI_PAGE_SHIFT; + u64 end = md->phys_addr + size; + if (!(md->attribute & EFI_MEMORY_RUNTIME) && + md->type != EFI_BOOT_SERVICES_CODE && + md->type != EFI_BOOT_SERVICES_DATA) + continue; + if (!md->virt_addr) + continue; + if (phys_addr >= md->phys_addr && phys_addr < end) { + phys_addr += md->virt_addr - md->phys_addr; + return (__force void __iomem *)(unsigned long)phys_addr; + } + } + return NULL; +} + +static __initdata efi_config_table_type_t common_tables[] = { + {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20}, + {ACPI_TABLE_GUID, "ACPI", &efi.acpi}, + {HCDP_TABLE_GUID, "HCDP", &efi.hcdp}, + {MPS_TABLE_GUID, "MPS", &efi.mps}, + {SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab}, + {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios}, + {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3}, + {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga}, + {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt}, + {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table}, + {NULL_GUID, NULL, NULL}, +}; + +static __init int match_config_table(efi_guid_t *guid, + unsigned long table, + efi_config_table_type_t *table_types) +{ + int i; + + if (table_types) { + for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) { + if (!efi_guidcmp(*guid, table_types[i].guid)) { + *(table_types[i].ptr) = table; + pr_cont(" %s=0x%lx ", + table_types[i].name, table); + return 1; + } + } + } + + return 0; +} + +int __init efi_config_parse_tables(void *config_tables, int count, int sz, + efi_config_table_type_t *arch_tables) +{ + void *tablep; + int i; + + tablep = config_tables; + pr_info(""); + for (i = 0; i < count; i++) { + efi_guid_t guid; + unsigned long table; + + if (efi_enabled(EFI_64BIT)) { + u64 table64; + guid = ((efi_config_table_64_t *)tablep)->guid; + table64 = ((efi_config_table_64_t *)tablep)->table; + table = table64; +#ifndef CONFIG_64BIT + if (table64 >> 32) { + pr_cont("\n"); + pr_err("Table located above 4GB, disabling EFI.\n"); + return -EINVAL; + } +#endif + } else { + guid = ((efi_config_table_32_t *)tablep)->guid; + table = ((efi_config_table_32_t *)tablep)->table; + } + + if (!match_config_table(&guid, table, common_tables)) + match_config_table(&guid, table, arch_tables); + + tablep += sz; + } + pr_cont("\n"); + set_bit(EFI_CONFIG_TABLES, &efi.flags); + + /* Parse the EFI Properties table if it exists */ + if (efi.properties_table != EFI_INVALID_TABLE_ADDR) { + efi_properties_table_t *tbl; + + tbl = early_memremap(efi.properties_table, sizeof(*tbl)); + if (tbl == NULL) { + pr_err("Could not map Properties table!\n"); + return -ENOMEM; + } + + if (tbl->memory_protection_attribute & + EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA) + set_bit(EFI_NX_PE_DATA, &efi.flags); + + early_memunmap(tbl, sizeof(*tbl)); + } + + return 0; +} + +int __init efi_config_init(efi_config_table_type_t *arch_tables) +{ + void *config_tables; + int sz, ret; + + if (efi_enabled(EFI_64BIT)) + sz = sizeof(efi_config_table_64_t); + else + sz = sizeof(efi_config_table_32_t); + + /* + * Let's see what config tables the firmware passed to us. + */ + config_tables = early_memremap(efi.systab->tables, + efi.systab->nr_tables * sz); + if (config_tables == NULL) { + pr_err("Could not map Configuration table!\n"); + return -ENOMEM; + } + + ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, sz, + arch_tables); + + early_memunmap(config_tables, efi.systab->nr_tables * sz); + return ret; +} + +#ifdef CONFIG_EFI_VARS_MODULE +static int __init efi_load_efivars(void) +{ + struct platform_device *pdev; + + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + return 0; + + pdev = platform_device_register_simple("efivars", 0, NULL, 0); + return IS_ERR(pdev) ? PTR_ERR(pdev) : 0; +} +device_initcall(efi_load_efivars); +#endif + +#ifdef CONFIG_EFI_PARAMS_FROM_FDT + +#define UEFI_PARAM(name, prop, field) \ + { \ + { name }, \ + { prop }, \ + offsetof(struct efi_fdt_params, field), \ + FIELD_SIZEOF(struct efi_fdt_params, field) \ + } + +static __initdata struct { + const char name[32]; + const char propname[32]; + int offset; + int size; +} dt_params[] = { + UEFI_PARAM("System Table", "linux,uefi-system-table", system_table), + UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap), + UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size), + UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size), + UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) +}; + +struct param_info { + int found; + void *params; +}; + +static int __init fdt_find_uefi_params(unsigned long node, const char *uname, + int depth, void *data) +{ + struct param_info *info = data; + const void *prop; + void *dest; + u64 val; + int i, len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); + if (!prop) + return 0; + dest = info->params + dt_params[i].offset; + info->found++; + + val = of_read_number(prop, len / sizeof(u32)); + + if (dt_params[i].size == sizeof(u32)) + *(u32 *)dest = val; + else + *(u64 *)dest = val; + + if (efi_enabled(EFI_DBG)) + pr_info(" %s: 0x%0*llx\n", dt_params[i].name, + dt_params[i].size * 2, val); + } + return 1; +} + +int __init efi_get_fdt_params(struct efi_fdt_params *params) +{ + struct param_info info; + int ret; + + pr_info("Getting EFI parameters from FDT:\n"); + + info.found = 0; + info.params = params; + + ret = of_scan_flat_dt(fdt_find_uefi_params, &info); + if (!info.found) + pr_info("UEFI not found.\n"); + else if (!ret) + pr_err("Can't find '%s' in device tree!\n", + dt_params[info.found].name); + + return ret; +} +#endif /* CONFIG_EFI_PARAMS_FROM_FDT */ + +static __initdata char memory_type_name[][20] = { + "Reserved", + "Loader Code", + "Loader Data", + "Boot Code", + "Boot Data", + "Runtime Code", + "Runtime Data", + "Conventional Memory", + "Unusable Memory", + "ACPI Reclaim Memory", + "ACPI Memory NVS", + "Memory Mapped I/O", + "MMIO Port Space", + "PAL Code" +}; + +char * __init efi_md_typeattr_format(char *buf, size_t size, + const efi_memory_desc_t *md) +{ + char *pos; + int type_len; + u64 attr; + + pos = buf; + if (md->type >= ARRAY_SIZE(memory_type_name)) + type_len = snprintf(pos, size, "[type=%u", md->type); + else + type_len = snprintf(pos, size, "[%-*s", + (int)(sizeof(memory_type_name[0]) - 1), + memory_type_name[md->type]); + if (type_len >= size) + return buf; + + pos += type_len; + size -= type_len; + + attr = md->attribute; + if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT | + EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO | + EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP | + EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE)) + snprintf(pos, size, "|attr=0x%016llx]", + (unsigned long long)attr); + else + snprintf(pos, size, "|%3s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]", + attr & EFI_MEMORY_RUNTIME ? "RUN" : "", + attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "", + attr & EFI_MEMORY_XP ? "XP" : "", + attr & EFI_MEMORY_RP ? "RP" : "", + attr & EFI_MEMORY_WP ? "WP" : "", + attr & EFI_MEMORY_RO ? "RO" : "", + attr & EFI_MEMORY_UCE ? "UCE" : "", + attr & EFI_MEMORY_WB ? "WB" : "", + attr & EFI_MEMORY_WT ? "WT" : "", + attr & EFI_MEMORY_WC ? "WC" : "", + attr & EFI_MEMORY_UC ? "UC" : ""); + return buf; +} + +/* + * efi_mem_attributes - lookup memmap attributes for physical address + * @phys_addr: the physical address to lookup + * + * Search in the EFI memory map for the region covering + * @phys_addr. Returns the EFI memory attributes if the region + * was found in the memory map, 0 otherwise. + * + * Despite being marked __weak, most architectures should *not* + * override this function. It is __weak solely for the benefit + * of ia64 which has a funky EFI memory map that doesn't work + * the same way as other architectures. + */ +u64 __weak efi_mem_attributes(unsigned long phys_addr) +{ + struct efi_memory_map *map; + efi_memory_desc_t *md; + void *p; + + if (!efi_enabled(EFI_MEMMAP)) + return 0; + + map = efi.memmap; + for (p = map->map; p < map->map_end; p += map->desc_size) { + md = p; + if ((md->phys_addr <= phys_addr) && + (phys_addr < (md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT)))) + return md->attribute; + } + return 0; +}