User can specify a DSDT with SSDT embedded, in which case, no_static_ssdt
must be enforced during compile-time. If we don't do that and forget to
specify acpi.no_static_ssdt as a boot parameter, then:
1. The AML executable will be executed twice, the second execution is
running under a changed environment.
2. The namespace object conflicts will result in an AE_ALREADY_EXISTS
exception;
3. The namespace objects that are deleted from the original SSDT will be
restored by the auto loading of the original SSDT.
Note that:
1. The DSDT customization is a compile-time feature, thus the SSDT
inclusion indication of the DSDT customization should also be
implemented as a compile-time configurable.
2. According to the commit log:
Commit: 67effe8fff32f60bdf51cba484766ba6003005bb
Subject: ACPI: add "acpi_no_auto_ssdt" bootparam
The acpi.no_static_ssdt (originally acpi.no_auto_ssdt) was introduced to
be used for this use case. And over a long time, there is no other
situation than this requires this boot parameter.
This patch thus converts the runtime kernel parameter into the compile-time
configuration item.
References: https://bugzilla.kernel.org/show_bug.cgi?id=3774
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=69711
Original-by: Enrico Etxe Arte <goitizena.generoa@xxxxxxxxx>
Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
---
Documentation/kernel-parameters.txt | 10 ----------
drivers/acpi/Kconfig | 32 ++++++++++++++++++++++++++------
drivers/acpi/internal.h | 5 +++++
drivers/acpi/osl.c | 8 +++-----
drivers/acpi/tables.c | 2 ++
5 files changed, 36 insertions(+), 21 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 831fb1e..ceba0d6 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -237,16 +237,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
This feature is enabled by default.
This option allows to turn off the feature.
- acpi_no_static_ssdt [HW,ACPI]
- Disable installation of static SSDTs at early boot time
- By default, SSDTs contained in the RSDT/XSDT will be
- installed automatically and they will appear under
- /sys/firmware/acpi/tables.
- This option turns off this feature.
- Note that specifying this option does not affect
- dynamic table installation which will install SSDT
- tables to /sys/firmware/acpi/tables/dynamic.
-
acpica_no_return_repair [HW, ACPI]
Disable AML predefined validation mechanism
This mechanism can repair the evaluation result to make
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index c0160bb..51dc3b8 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -216,22 +216,40 @@ config ACPI_NUMA
depends on (X86 || IA64)
default y if IA64_GENERIC || IA64_SGI_SN2
-config ACPI_CUSTOM_DSDT_FILE
- string "Custom DSDT Table file to include"
- default ""
+menu "Table override"
+
+menuconfig ACPI_CUSTOM_DSDT
+ bool "Customize DSDT"
depends on !STANDALONE
help
This option supports a custom DSDT by linking it into the kernel.
See Documentation/acpi/dsdt-override.txt
+ If unsure, say N.
+
+if ACPI_CUSTOM_DSDT
+
+config ACPI_CUSTOM_DSDT_FILE
+ string "Custom DSDT Table file to include"
+ default ""
+ help
Enter the full path name to the file which includes the AmlCode
declaration.
If unsure, don't enter a file name.
-config ACPI_CUSTOM_DSDT
- bool
- default ACPI_CUSTOM_DSDT_FILE != ""
+config ACPI_CUSTOM_DSDT_WITH_SSDT
+ bool "Customize DSDT with static SSDTs included"
+ depends on ACPI_CUSTOM_DSDT
+ help
+ This option allows a DSDT override to optionally be a DSDT+SSDT
+ override. In which case, Linux should stop loading static SSDTs
+ from RSDT/XSDT. Otherwise, the load time AML execution of the
+ SSDTs will be errornously executed twice.
+
+ If unsure, say N.
+
+endif
config ACPI_INITRD_TABLE_OVERRIDE
bool "ACPI tables override via initrd"
@@ -243,6 +261,8 @@ config ACPI_INITRD_TABLE_OVERRIDE
initrd, therefore it's safe to say Y.
See Documentation/acpi/initrd_table_override.txt for details
+endmenu
+
config ACPI_DEBUG
bool "Debug Statements"
default n
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 9573913..f84ef59 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -57,6 +57,11 @@ void acpi_cmos_rtc_init(void);
#else
static inline void acpi_cmos_rtc_init(void) {}
#endif
+#ifdef CONFIG_ACPI_CUSTOM_DSDT_WITH_SSDT
+void __init acpi_ssdt_customized(void);
+#else
+static inline void acpi_ssdt_customized(void) {}
+#endif
extern bool acpi_force_hot_remove;
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 9aeae41..c6024c2 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1770,15 +1770,13 @@ acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
}
#endif
-static int __init acpi_no_static_ssdt_setup(char *s)
+#ifdef CONFIG_ACPI_CUSTOM_DSDT_WITH_SSDT
+void __init acpi_ssdt_customized(void)
{
acpi_gbl_disable_ssdt_table_install = TRUE;
pr_info("ACPI: static SSDT installation disabled\n");
-
- return 0;
}
-
-early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
+#endif
static int __init acpi_disable_return_repair(char *s)
{
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 2178229..aaf2177 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -184,6 +184,7 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
}
}
+#include "internal.h"
int __init
acpi_table_parse_entries(char *id,
@@ -333,6 +334,7 @@ int __init acpi_table_init(void)
{
acpi_status status;
+ acpi_ssdt_customized();
status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
if (ACPI_FAILURE(status))
return -EINVAL;
--
1.7.10
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
