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Subject[PATCH] ACPI / tables: table upgrade from built-in initrd
Date
In some scenario, we need to build initrd with kernel in a single image.
This can simplify system deployment process by downloading the whole system
once, such as in IC verification.

This patch adds support to upgrade ACPI tables from built-in initrd.

Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
---
drivers/acpi/Kconfig | 9 +++++++++
drivers/acpi/tables.c | 12 ++++++++++--
include/linux/initrd.h | 3 +++
3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7cea769c37df..30976496fe77 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -357,6 +357,15 @@ config ACPI_TABLE_UPGRADE
initrd, therefore it's safe to say Y.
See Documentation/acpi/initrd_table_override.txt for details

+config ACPI_TABLE_UPGRADE_VIA_BUILTIN_INITRD
+ bool "Upgrade ACPI tables from built-in initrd"
+ depends on ACPI_TABLE_UPGRADE
+ depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
+ def_bool n
+ help
+ This option provides functionality to upgrade arbitrary ACPI tables
+ from built-in uncompressed initrd.
+
config ACPI_DEBUG
bool "Debug Statements"
help
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 61203eebf3a1..88e3a34443da 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -473,14 +473,22 @@ static u8 __init acpi_table_checksum(u8 *buffer, u32 length)

void __init acpi_table_upgrade(void)
{
- void *data = (void *)initrd_start;
- size_t size = initrd_end - initrd_start;
+ void *data;
+ size_t size;
int sig, no, table_nr = 0, total_offset = 0;
long offset = 0;
struct acpi_table_header *table;
char cpio_path[32] = "kernel/firmware/acpi/";
struct cpio_data file;

+ if (IS_ENABLED(CONFIG_ACPI_TABLE_UPGRADE_VIA_BUILTIN_INITRD)) {
+ data = __initramfs_start;
+ size = __initramfs_size;
+ } else {
+ data = (void *)initrd_start;
+ size = initrd_end - initrd_start;
+ }
+
if (data == NULL || size == 0)
return;

diff --git a/include/linux/initrd.h b/include/linux/initrd.h
index 84b423044088..02d94aae54c7 100644
--- a/include/linux/initrd.h
+++ b/include/linux/initrd.h
@@ -22,3 +22,6 @@
extern void free_initrd_mem(unsigned long, unsigned long);

extern unsigned int real_root_dev;
+
+extern char __initramfs_start[];
+extern unsigned long __initramfs_size;
--
1.8.3.1
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