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-rw-r--r--drivers/firmware/efi/arm-init.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index e0a511d4074f..8efe13075c92 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -26,9 +26,9 @@
u64 efi_system_table;
-static int __init is_normal_ram(efi_memory_desc_t *md)
+static int __init is_memory(efi_memory_desc_t *md)
{
- if (md->attribute & EFI_MEMORY_WB)
+ if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
return 1;
return 0;
}
@@ -152,9 +152,9 @@ out:
}
/*
- * Return true for RAM regions we want to permanently reserve.
+ * Return true for regions that can be used as System RAM.
*/
-static __init int is_reserve_region(efi_memory_desc_t *md)
+static __init int is_usable_memory(efi_memory_desc_t *md)
{
switch (md->type) {
case EFI_LOADER_CODE:
@@ -163,18 +163,22 @@ static __init int is_reserve_region(efi_memory_desc_t *md)
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
case EFI_PERSISTENT_MEMORY:
- return 0;
+ /*
+ * According to the spec, these regions are no longer reserved
+ * after calling ExitBootServices(). However, we can only use
+ * them as System RAM if they can be mapped writeback cacheable.
+ */
+ return (md->attribute & EFI_MEMORY_WB);
default:
break;
}
- return is_normal_ram(md);
+ return false;
}
static __init void reserve_regions(void)
{
efi_memory_desc_t *md;
u64 paddr, npages, size;
- int resv;
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI memory map:\n");
@@ -191,25 +195,23 @@ static __init void reserve_regions(void)
paddr = md->phys_addr;
npages = md->num_pages;
- resv = is_reserve_region(md);
if (efi_enabled(EFI_DBG)) {
char buf[64];
- pr_info(" 0x%012llx-0x%012llx %s%s\n",
+ pr_info(" 0x%012llx-0x%012llx %s\n",
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
- efi_md_typeattr_format(buf, sizeof(buf), md),
- resv ? "*" : "");
+ efi_md_typeattr_format(buf, sizeof(buf), md));
}
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
- if (is_normal_ram(md))
+ if (is_memory(md)) {
early_init_dt_add_memory_arch(paddr, size);
- if (resv)
- memblock_mark_nomap(paddr, size);
-
+ if (!is_usable_memory(md))
+ memblock_mark_nomap(paddr, size);
+ }
}
}