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ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option 

This essentially reverts commit 71fc47a9ad
("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: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2008-03-15 11:53:32 -07:00
parent ce63645234
commit 9a9e0d6855
7 changed files with 3 additions and 165 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/acpi/dsdt-override.txt
View File

@ -1,15 +1,7 @@
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.

43
Documentation/acpi/initramfs-add-dsdt.sh
View File

@ -1,43 +0,0 @@
#!/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"

3
Documentation/kernel-parameters.txt
View File

@ -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"

11
drivers/acpi/Kconfig
View File

@ -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

84
drivers/acpi/osl.c
View File

@ -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;

8
init/initramfs.c
View File

@ -538,7 +538,7 @@ skip:
initrd_end = 0;
}
int __init populate_rootfs(void)
static int __init populate_rootfs(void)
{
char *err = unpack_to_rootfs(__initramfs_start,
__initramfs_end - __initramfs_start, 0);
@ -577,10 +577,4 @@ int __init populate_rootfs(void)
}
return 0;
}
#ifndef CONFIG_ACPI_CUSTOM_DSDT_INITRD
/*
* if this option is enabled, populate_rootfs() is called _earlier_ in the
* boot sequence. This insures that the ACPI initialisation can find the file.
*/
rootfs_initcall(populate_rootfs);
#endif

7
init/main.c
View File

@ -102,12 +102,6 @@ static inline void mark_rodata_ro(void) { }
extern void tc_init(void);
#endif
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
extern int populate_rootfs(void);
#else
static inline void populate_rootfs(void) {}
#endif
enum system_states system_state;
EXPORT_SYMBOL(system_state);
@ -650,7 +644,6 @@ asmlinkage void __init start_kernel(void)
check_bugs();
populate_rootfs(); /* For DSDT override from initramfs */
acpi_early_init(); /* before LAPIC and SMP init */
/* Do the rest non-__init'ed, we're now alive */