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author | Ard Biesheuvel <ardb@kernel.org> | 2020-02-18 09:54:05 +0100 |
---|---|---|
committer | Ard Biesheuvel <ardb@kernel.org> | 2020-02-23 21:59:42 +0100 |
commit | ac5abc700a43b3d448c86932196db22af470eca1 (patch) | |
tree | 4ec16c7d08661696c9725e71f6fd6605b678ea85 /drivers/firmware | |
parent | 97aa276579b28b86f4a3e235b50762c0191c2ac3 (diff) | |
download | linux-stable-ac5abc700a43b3d448c86932196db22af470eca1.tar.gz linux-stable-ac5abc700a43b3d448c86932196db22af470eca1.tar.bz2 linux-stable-ac5abc700a43b3d448c86932196db22af470eca1.zip |
efi/arm: Move FDT param discovery code out of efi.c
On ARM systems, we discover the UEFI system table address and memory
map address from the /chosen node in the device tree, or in the Xen
case, from a similar node under /hypervisor.
Before making some functional changes to that code, move it into its
own file that only gets built if CONFIG_EFI_PARAMS_FROM_FDT=y.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'drivers/firmware')
-rw-r--r-- | drivers/firmware/efi/Makefile | 1 | ||||
-rw-r--r-- | drivers/firmware/efi/efi.c | 135 | ||||
-rw-r--r-- | drivers/firmware/efi/fdtparams.c | 142 |
3 files changed, 143 insertions, 135 deletions
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index 554d795270d9..3c5a9690de04 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -13,6 +13,7 @@ KASAN_SANITIZE_runtime-wrappers.o := n obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o tpm.o obj-$(CONFIG_EFI) += capsule.o memmap.o +obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o obj-$(CONFIG_EFI_VARS) += efivars.o obj-$(CONFIG_EFI_ESRT) += esrt.o obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 718dddfa0a0b..7dbe1487b111 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -20,7 +20,6 @@ #include <linux/device.h> #include <linux/efi.h> #include <linux/of.h> -#include <linux/of_fdt.h> #include <linux/io.h> #include <linux/kexec.h> #include <linux/platform_device.h> @@ -646,140 +645,6 @@ static int __init efi_load_efivars(void) 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), \ - sizeof_field(struct efi_fdt_params, field) \ - } - -struct params { - const char name[32]; - const char propname[32]; - int offset; - int size; -}; - -static __initdata struct params fdt_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) -}; - -static __initdata struct params xen_fdt_params[] = { - UEFI_PARAM("System Table", "xen,uefi-system-table", system_table), - UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap), - UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size), - UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size), - UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver) -}; - -#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) - -static __initdata struct { - const char *uname; - const char *subnode; - struct params *params; -} dt_params[] = { - { "hypervisor", "uefi", xen_fdt_params }, - { "chosen", NULL, fdt_params }, -}; - -struct param_info { - int found; - void *params; - const char *missing; -}; - -static int __init __find_uefi_params(unsigned long node, - struct param_info *info, - struct params *params) -{ - const void *prop; - void *dest; - u64 val; - int i, len; - - for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { - prop = of_get_flat_dt_prop(node, params[i].propname, &len); - if (!prop) { - info->missing = params[i].name; - return 0; - } - - dest = info->params + params[i].offset; - info->found++; - - val = of_read_number(prop, len / sizeof(u32)); - - if (params[i].size == sizeof(u32)) - *(u32 *)dest = val; - else - *(u64 *)dest = val; - - if (efi_enabled(EFI_DBG)) - pr_info(" %s: 0x%0*llx\n", params[i].name, - params[i].size * 2, val); - } - - return 1; -} - -static int __init fdt_find_uefi_params(unsigned long node, const char *uname, - int depth, void *data) -{ - struct param_info *info = data; - int i; - - for (i = 0; i < ARRAY_SIZE(dt_params); i++) { - const char *subnode = dt_params[i].subnode; - - if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { - info->missing = dt_params[i].params[0].name; - continue; - } - - if (subnode) { - int err = of_get_flat_dt_subnode_by_name(node, subnode); - - if (err < 0) - return 0; - - node = err; - } - - return __find_uefi_params(node, info, dt_params[i].params); - } - - return 0; -} - -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", - info.missing); - - return ret; -} -#endif /* CONFIG_EFI_PARAMS_FROM_FDT */ - static __initdata char memory_type_name[][20] = { "Reserved", "Loader Code", diff --git a/drivers/firmware/efi/fdtparams.c b/drivers/firmware/efi/fdtparams.c new file mode 100644 index 000000000000..3de343faffc6 --- /dev/null +++ b/drivers/firmware/efi/fdtparams.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/efi.h> +#include <linux/of.h> +#include <linux/of_fdt.h> + +#include <asm/early_ioremap.h> + +#define UEFI_PARAM(name, prop, field) \ + { \ + { name }, \ + { prop }, \ + offsetof(struct efi_fdt_params, field), \ + sizeof_field(struct efi_fdt_params, field) \ + } + +struct params { + const char name[32]; + const char propname[32]; + int offset; + int size; +}; + +static __initdata struct params fdt_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) +}; + +static __initdata struct params xen_fdt_params[] = { + UEFI_PARAM("System Table", "xen,uefi-system-table", system_table), + UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap), + UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size), + UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size), + UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver) +}; + +#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) + +static __initdata struct { + const char *uname; + const char *subnode; + struct params *params; +} dt_params[] = { + { "hypervisor", "uefi", xen_fdt_params }, + { "chosen", NULL, fdt_params }, +}; + +struct param_info { + int found; + void *params; + const char *missing; +}; + +static int __init __find_uefi_params(unsigned long node, + struct param_info *info, + struct params *params) +{ + const void *prop; + void *dest; + u64 val; + int i, len; + + for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { + prop = of_get_flat_dt_prop(node, params[i].propname, &len); + if (!prop) { + info->missing = params[i].name; + return 0; + } + + dest = info->params + params[i].offset; + info->found++; + + val = of_read_number(prop, len / sizeof(u32)); + + if (params[i].size == sizeof(u32)) + *(u32 *)dest = val; + else + *(u64 *)dest = val; + + if (efi_enabled(EFI_DBG)) + pr_info(" %s: 0x%0*llx\n", params[i].name, + params[i].size * 2, val); + } + + return 1; +} + +static int __init fdt_find_uefi_params(unsigned long node, const char *uname, + int depth, void *data) +{ + struct param_info *info = data; + int i; + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + const char *subnode = dt_params[i].subnode; + + if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { + info->missing = dt_params[i].params[0].name; + continue; + } + + if (subnode) { + int err = of_get_flat_dt_subnode_by_name(node, subnode); + + if (err < 0) + return 0; + + node = err; + } + + return __find_uefi_params(node, info, dt_params[i].params); + } + + return 0; +} + +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", + info.missing); + + return ret; +} |