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Message-ID: <3194723.o46ouvvENe@vostro.rjw.lan>
Date: Tue, 20 May 2014 00:49:04 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Lv Zheng <lv.zheng@...el.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Len Brown <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3 1/2] ACPI: Cleanup to convert acpi.no_static_ssdt into a compile-time configurable.
On Monday, May 12, 2014 03:49:59 PM Lv Zheng wrote:
> 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@...il.com>
> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> ---
> 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
I would make this a choice, like the "Kernel compression mode" (in init/Kconfig).
Then ACPI_CUSTOM_DSDT_ONLY and ACPI_CUSTOM_DSDT_WITH_SSDT may be the options
and they both would select ACPI_CUSTOM_DSDT (otherwise invisible to the user), and ->
> + 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
-> this would work for both.
Would that make sense?
> + 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;
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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