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authorArd Biesheuvel <ardb@kernel.org>2020-01-20 17:39:39 +0100
committerArd Biesheuvel <ardb@kernel.org>2020-02-23 21:59:42 +0100
commit8819ba39661efec88efd11610988424cb1bf99f8 (patch)
tree2734cf0a5093ba27fe4000f890cee1b93167260c
parent59f2a619a2db86111e8bb30f349aebff6eb75baa (diff)
efi/arm: Drop unnecessary references to efi.systab
Instead of populating efi.systab very early during efi_init() with a mapping that is released again before the function exits, use a local variable here. Now that we use efi.runtime to access the runtime services table, this removes the only reference efi.systab, so there is no need to populate it anymore, or discover its virtually remapped address. So drop the references entirely. Tested-by: Tony Luck <tony.luck@intel.com> # arch/ia64 Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
-rw-r--r--drivers/firmware/efi/arm-init.c33
-rw-r--r--drivers/firmware/efi/arm-runtime.c18
2 files changed, 14 insertions, 37 deletions
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index 77048f7a9659..76bf5b22e49e 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -22,8 +22,6 @@
#include <asm/efi.h>
-u64 efi_system_table;
-
static int __init is_memory(efi_memory_desc_t *md)
{
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
@@ -36,7 +34,7 @@ static int __init is_memory(efi_memory_desc_t *md)
* as some data members of the EFI system table are virtually remapped after
* SetVirtualAddressMap() has been called.
*/
-static phys_addr_t efi_to_phys(unsigned long addr)
+static phys_addr_t __init efi_to_phys(unsigned long addr)
{
efi_memory_desc_t *md;
@@ -83,15 +81,15 @@ static void __init init_screen_info(void)
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
}
-static int __init uefi_init(void)
+static int __init uefi_init(u64 efi_system_table)
{
efi_config_table_t *config_tables;
+ efi_system_table_t *systab;
size_t table_size;
int retval;
- efi.systab = early_memremap_ro(efi_system_table,
- sizeof(efi_system_table_t));
- if (efi.systab == NULL) {
+ systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
+ if (systab == NULL) {
pr_warn("Unable to map EFI system table.\n");
return -ENOMEM;
}
@@ -100,30 +98,29 @@ static int __init uefi_init(void)
if (IS_ENABLED(CONFIG_64BIT))
set_bit(EFI_64BIT, &efi.flags);
- retval = efi_systab_check_header(&efi.systab->hdr, 2);
+ retval = efi_systab_check_header(&systab->hdr, 2);
if (retval)
goto out;
- efi.runtime = efi.systab->runtime;
- efi.runtime_version = efi.systab->hdr.revision;
+ efi.runtime = systab->runtime;
+ efi.runtime_version = systab->hdr.revision;
- efi_systab_report_header(&efi.systab->hdr,
- efi_to_phys(efi.systab->fw_vendor));
+ efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
- table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables;
- config_tables = early_memremap_ro(efi_to_phys(efi.systab->tables),
+ table_size = sizeof(efi_config_table_t) * systab->nr_tables;
+ config_tables = early_memremap_ro(efi_to_phys(systab->tables),
table_size);
if (config_tables == NULL) {
pr_warn("Unable to map EFI config table array.\n");
retval = -ENOMEM;
goto out;
}
- retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
+ retval = efi_config_parse_tables(config_tables, systab->nr_tables,
arch_tables);
early_memunmap(config_tables, table_size);
out:
- early_memunmap(efi.systab, sizeof(efi_system_table_t));
+ early_memunmap(systab, sizeof(efi_system_table_t));
return retval;
}
@@ -214,8 +211,6 @@ void __init efi_init(void)
if (!efi_get_fdt_params(&params))
return;
- efi_system_table = params.system_table;
-
data.desc_version = params.desc_ver;
data.desc_size = params.desc_size;
data.size = params.mmap_size;
@@ -234,7 +229,7 @@ void __init efi_init(void)
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
efi.memmap.desc_version);
- if (uefi_init() < 0) {
+ if (uefi_init(params.system_table) < 0) {
efi_memmap_unmap();
return;
}
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 9dda2602c862..b876373f2297 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -25,8 +25,6 @@
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
-extern u64 efi_system_table;
-
#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64)
#include <asm/ptdump.h>
@@ -54,13 +52,11 @@ device_initcall(ptdump_init);
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
- bool systab_found;
efi_mm.pgd = pgd_alloc(&efi_mm);
mm_init_cpumask(&efi_mm);
init_new_context(NULL, &efi_mm);
- systab_found = false;
for_each_efi_memory_desc(md) {
phys_addr_t phys = md->phys_addr;
int ret;
@@ -76,20 +72,6 @@ static bool __init efi_virtmap_init(void)
&phys, ret);
return false;
}
- /*
- * If this entry covers the address of the UEFI system table,
- * calculate and record its virtual address.
- */
- if (efi_system_table >= phys &&
- efi_system_table < phys + (md->num_pages * EFI_PAGE_SIZE)) {
- efi.systab = (void *)(unsigned long)(efi_system_table -
- phys + md->virt_addr);
- systab_found = true;
- }
- }
- if (!systab_found) {
- pr_err("No virtual mapping found for the UEFI System Table\n");
- return false;
}
if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions))