Commit 9a9e0d68 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option 



This essentially reverts commit 71fc47a9
("ACPI: basic initramfs DSDT override support"), because the code simply
isn't ready.

It did ugly things to the init sequence to populate the rootfs image
early, but that just ended up showing other problems with the whole
approach.  The fact is, the VFS layer simply isn't initialized this
early, and the relevant ACPI code should either run much later, or this
shouldn't be done at all.

For 2.6.25, we'll just pick the latter option.  We can revisit this
concept later if necessary.

Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Eric Piel <eric.piel@tremplin-utc.net>
Cc: Len Brown <len.brown@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Markus Gaugusch <dsdt@gaugusch.at>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ce636452

Documentation/acpi/dsdt-override.txt

+2 −10
Original line number Diff line number Diff line 
Linux supports two methods of overriding the BIOS DSDT:

Linux supports a method of overriding the BIOS DSDT:



CONFIG_ACPI_CUSTOM_DSDT builds the image into the kernel.



CONFIG_ACPI_CUSTOM_DSDT_INITRD adds the image to the initrd.



When to use these methods is described in detail on the

When to use this method is described in detail on the

Linux/ACPI home page:

http://www.lesswatts.org/projects/acpi/overridingDSDT.php
 


Note that if both options are used, the DSDT supplied

by the INITRD method takes precedence.



Documentation/initramfs-add-dsdt.sh is provided for convenience

for use with the CONFIG_ACPI_CUSTOM_DSDT_INITRD method.

Documentation/acpi/initramfs-add-dsdt.sh

deleted100755 → 0
+0 −43
Original line number Diff line number Diff line 
#!/bin/bash

# Adds a DSDT file to the initrd (if it's an initramfs)

# first argument is the name of archive

# second argument is the name of the file to add

# The file will be copied as /DSDT.aml



# 20060126: fix "Premature end of file" with some old cpio (Roland Robic)

# 20060205: this time it should really work



# check the arguments

if [ $# -ne 2 ]; then

	program_name=$(basename $0)

	echo "\

$program_name: too few arguments

Usage: $program_name initrd-name.img DSDT-to-add.aml

Adds a DSDT file to an initrd (in initramfs format)



  initrd-name.img: filename of the initrd in initramfs format

  DSDT-to-add.aml: filename of the DSDT file to add

  " 1>&2

    exit 1

fi



# we should check it's an initramfs



tempcpio=$(mktemp -d)

# cleanup on exit, hangup, interrupt, quit, termination

trap 'rm -rf $tempcpio' 0 1 2 3 15



# extract the archive

gunzip -c "$1" > "$tempcpio"/initramfs.cpio || exit 1



# copy the DSDT file at the root of the directory so that we can call it "/DSDT.aml"

cp -f "$2" "$tempcpio"/DSDT.aml



# add the file

cd "$tempcpio"

(echo DSDT.aml | cpio --quiet -H newc -o -A -O "$tempcpio"/initramfs.cpio) || exit 1

cd "$OLDPWD"



# re-compress the archive

gzip -c "$tempcpio"/initramfs.cpio > "$1"

Documentation/kernel-parameters.txt

+0 −3
Original line number Diff line number Diff line
@@ -177,9 +177,6 @@ and is between 256 and 4096 characters. It is defined in the file 


	acpi_no_auto_ssdt	[HW,ACPI] Disable automatic loading of SSDT



	acpi_no_initrd_override	[KNL,ACPI]

			Disable loading custom ACPI tables from the initramfs



	acpi_os_name=	[HW,ACPI] Tell ACPI BIOS the name of the OS

			Format: To spoof as Windows 98: ="Microsoft Windows"

drivers/acpi/Kconfig

+0 −11
Original line number Diff line number Diff line
@@ -300,17 +300,6 @@ config ACPI_CUSTOM_DSDT 
	bool

	default ACPI_CUSTOM_DSDT_FILE != ""



config ACPI_CUSTOM_DSDT_INITRD

	bool "Read Custom DSDT from initramfs"

	depends on BLK_DEV_INITRD

	default n

	help

	  This option supports a custom DSDT by optionally loading it from initrd.

	  See Documentation/acpi/dsdt-override.txt



	  If you are not using this feature now, but may use it later,

	  it is safe to say Y here.



config ACPI_BLACKLIST_YEAR

	int "Disable ACPI for systems before Jan 1st this year" if X86_32

	default 0

drivers/acpi/osl.c

+0 −84
Original line number Diff line number Diff line
@@ -91,10 +91,6 @@ static DEFINE_SPINLOCK(acpi_res_lock); 
#define	OSI_STRING_LENGTH_MAX 64	/* arbitrary */

static char osi_additional_string[OSI_STRING_LENGTH_MAX];



#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD

static int acpi_no_initrd_override;

#endif



/*

 * "Ode to _OSI(Linux)"

 *
@@ -324,67 +320,6 @@ acpi_os_predefined_override(const struct acpi_predefined_names *init_val, 
	return AE_OK;

}



#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD

static struct acpi_table_header *acpi_find_dsdt_initrd(void)

{

	struct file *firmware_file;

	mm_segment_t oldfs;

	unsigned long len, len2;

	struct acpi_table_header *dsdt_buffer, *ret = NULL;

	struct kstat stat;

	char *ramfs_dsdt_name = "/DSDT.aml";



	printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT\n");



	/*

	 * Never do this at home, only the user-space is allowed to open a file.

	 * The clean way would be to use the firmware loader.

	 * But this code must be run before there is any userspace available.

	 * A static/init firmware infrastructure doesn't exist yet...

	 */

	if (vfs_stat(ramfs_dsdt_name, &stat) < 0)

		return ret;



	len = stat.size;

	/* check especially against empty files */

	if (len <= 4) {

		printk(KERN_ERR PREFIX "Failed: DSDT only %lu bytes.\n", len);

		return ret;

	}



	firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0);

	if (IS_ERR(firmware_file)) {

		printk(KERN_ERR PREFIX "Failed to open %s.\n", ramfs_dsdt_name);

		return ret;

	}



	dsdt_buffer = kmalloc(len, GFP_ATOMIC);

	if (!dsdt_buffer) {

		printk(KERN_ERR PREFIX "Failed to allocate %lu bytes.\n", len);

		goto err;

	}



	oldfs = get_fs();

	set_fs(KERNEL_DS);

	len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len,

		&firmware_file->f_pos);

	set_fs(oldfs);

	if (len2 < len) {

		printk(KERN_ERR PREFIX "Failed to read %lu bytes from %s.\n",

			len, ramfs_dsdt_name);

		ACPI_FREE(dsdt_buffer);

		goto err;

	}



	printk(KERN_INFO PREFIX "Found %lu byte DSDT in %s.\n",

			len, ramfs_dsdt_name);

	ret = dsdt_buffer;

err:

	filp_close(firmware_file, NULL);

	return ret;

}

#endif



acpi_status

acpi_os_table_override(struct acpi_table_header * existing_table,

		       struct acpi_table_header ** new_table)
@@ -397,16 +332,6 @@ acpi_os_table_override(struct acpi_table_header * existing_table, 
#ifdef CONFIG_ACPI_CUSTOM_DSDT

	if (strncmp(existing_table->signature, "DSDT", 4) == 0)

		*new_table = (struct acpi_table_header *)AmlCode;

#endif

#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD

	if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&

	    !acpi_no_initrd_override) {

		struct acpi_table_header *initrd_table;



		initrd_table = acpi_find_dsdt_initrd();

		if (initrd_table)

			*new_table = initrd_table;

	}

#endif

	if (*new_table != NULL) {

		printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
@@ -418,15 +343,6 @@ acpi_os_table_override(struct acpi_table_header * existing_table, 
	return AE_OK;

}



#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD

static int __init acpi_no_initrd_override_setup(char *s)

{

	acpi_no_initrd_override = 1;

	return 1;

}

__setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);

#endif



static irqreturn_t acpi_irq(int irq, void *dev_id)

{

	u32 handled;

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