[PATCH 3/3] ACPI: ARM64: support for ACPI_TABLE_UPGRADE

Aleksey Makarov
2016-05-17T12:06:03Z

From: Jon Masters <jcm@redhat.com>

This patch adds support for ACPI_TABLE_UPGRADE for ARM64

To access initrd image we need to move initialization
of linear mapping a bit earlier.

Signed-off-by: Jon Masters <jcm@redhat.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
---
arch/arm64/kernel/setup.c | 6 ++++--
drivers/acpi/Kconfig | 2 +-
drivers/acpi/tables.c | 10 +++++++++-
3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index feab2ee..1d5e24f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -261,11 +261,13 @@ void __init setup_arch(char **cmdline_p)
efi_init();
arm64_memblock_init();

+ paging_init();
+
+ early_initrd_acpi_init();
+
/* Parse the ACPI tables for possible boot-time configuration */
acpi_boot_table_init();

- paging_init();
-
if (acpi_disabled)
unflatten_device_tree();

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index c204344..ec694c0 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -313,7 +313,7 @@ config ACPI_CUSTOM_DSDT

config ACPI_TABLE_UPGRADE
bool "Allow upgrading ACPI tables via initrd"
- depends on BLK_DEV_INITRD && X86
+ depends on BLK_DEV_INITRD && (X86 || ARM64)
default y
help
This option provides functionality to upgrade arbitrary ACPI tables
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 82be84a..c35034d8 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -482,6 +482,14 @@ static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);

#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)

+#if defined(CONFIG_X86)
+#define MAX_PHYS_ACPI_TABLES (max_low_pfn_mapped << PAGE_SHIFT)
+#elif defined(CONFIG_ARM64)
+#define MAX_PHYS_ACPI_TABLES PFN_PHYS(max_pfn)
+#else
+#error "MAX_PHYS_ACPI_TABLES is not defiend for this architecture"
+#endif
+
static void __init acpi_table_initrd_init(void *data, size_t size)
{
int sig, no, table_nr = 0, total_offset = 0;
@@ -541,7 +549,7 @@ static void __init acpi_table_initrd_init(void *data, size_t size)
return;

acpi_tables_addr =
- memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
+ memblock_find_in_range(0, MAX_PHYS_ACPI_TABLES,
all_tables_size, PAGE_SIZE);
if (!acpi_tables_addr) {
WARN_ON(1);
--
2.8.2