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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2018-06-18 16:02:26 +0900
committerAKASHI Takahiro <takahiro.akashi@linaro.org>2018-07-11 09:09:22 +0900
commit7a9ce8a2daf2e32e1f16ef6658fbe69f5024d624 (patch)
treeef23ff5e57a9c3394569d7d52fe1623581cee1e4
parent8c8b226806c4b277757d0f6ba10a19d8c378a33f (diff)
downloadlinux-aarch64-7a9ce8a2daf2e32e1f16ef6658fbe69f5024d624.tar.gz
efi/arm: map UEFI memory map even w/o runtime services enabled
Under the current implementation, UEFI memory map will be mapped and made available in virtual mappings only if runtime services are enabled. But in a later patch, we want to use UEFI memory map in acpi_os_ioremap() to create mappings of ACPI tables using memory attributes described in UEFI memory map. See the following commit: arm64: acpi: fix alignment fault in accessing ACPI tables So, as a first step, arm_enter_runtime_services() is modified, alongside Ard's patch[1], so that UEFI memory map will not be freed even if efi=noruntime. [1] https://marc.info/?l=linux-efi&m=152930773507524&w=2 Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
-rw-r--r--drivers/firmware/efi/arm-runtime.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 59a8c0ec94d5..a00934d263c5 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -117,6 +117,13 @@ static int __init arm_enable_runtime_services(void)
efi_memmap_unmap();
+ mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
+
+ if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
+ pr_err("Failed to remap EFI memory map\n");
+ return 0;
+ }
+
if (efi_runtime_disabled()) {
pr_info("EFI runtime services will be disabled.\n");
return 0;
@@ -129,13 +136,6 @@ static int __init arm_enable_runtime_services(void)
pr_info("Remapping and enabling EFI services.\n");
- mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
-
- if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
- pr_err("Failed to remap EFI memory map\n");
- return -ENOMEM;
- }
-
if (!efi_virtmap_init()) {
pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
return -ENOMEM;