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efi: ARM/arm64: ignore DT memory nodes instead of removing them

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There are two problems with the UEFI stub DT memory node removal
routine:
- it deletes nodes as it traverses the tree, which happens to work
  but is not supported, as deletion invalidates the node iterator;
- deleting memory nodes entirely may discard annotations in the form
  of additional properties on the nodes.

Since the discovery of DT memory nodes occurs strictly before the
UEFI init sequence, we can simply clear the memblock memory table
before parsing the UEFI memory map. This way, it is no longer
necessary to remove the nodes, so we can remove that logic from the
stub as well.

Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Acked-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel 2016-04-08 15:50:23 -07:00 committed by Will Deacon
parent ac1ad20f9e
commit 500899c2cc
2 changed files with 9 additions and 23 deletions
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8
drivers/firmware/efi/arm-init.c
View File

@ -143,6 +143,14 @@ static __init void reserve_regions(void)
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI memory map:\n");
/*
* Discard memblocks discovered so far: if there are any at this
* point, they originate from memory nodes in the DT, and UEFI
* uses its own memory map instead.
*/
memblock_dump_all();
memblock_remove(0, ULLONG_MAX);
for_each_efi_memory_desc(&memmap, md) {
paddr = md->phys_addr;
npages = md->num_pages;

24
drivers/firmware/efi/libstub/fdt.c
View File

@ -24,7 +24,7 @@ efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
unsigned long map_size, unsigned long desc_size,
u32 desc_ver)
{
int node, prev, num_rsv;
int node, num_rsv;
int status;
u32 fdt_val32;
u64 fdt_val64;
@ -53,28 +53,6 @@ efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
if (status != 0)
goto fdt_set_fail;
/*
* Delete any memory nodes present. We must delete nodes which
* early_init_dt_scan_memory may try to use.
*/
prev = 0;
for (;;) {
const char *type;
int len;
node = fdt_next_node(fdt, prev, NULL);
if (node < 0)
break;
type = fdt_getprop(fdt, node, "device_type", &len);
if (type && strncmp(type, "memory", len) == 0) {
fdt_del_node(fdt, node);
continue;
}
prev = node;
}
/*
* Delete all memory reserve map entries. When booting via UEFI,
* kernel will use the UEFI memory map to find reserved regions.