Commit d5f017b7 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

Merge branch 'acpi-tables'

* acpi-tables:
  ACPI: Rename configfs.c to acpi_configfs.c to prevent link error
  ACPI: add support for loading SSDTs via configfs
  ACPI: add support for configfs
  efi / ACPI: load SSTDs from EFI variables
  spi / ACPI: add support for ACPI reconfigure notifications
  i2c / ACPI: add support for ACPI reconfigure notifications
  ACPI: add support for ACPI reconfiguration notifiers
  ACPI / scan: fix enumeration (visited) flags for bus rescans
  ACPI / documentation: add SSDT overlays documentation
  ACPI: ARM64: support for ACPI_TABLE_UPGRADE
  ACPI / tables: introduce ARCH_HAS_ACPI_TABLE_UPGRADE
  ACPI / tables: move arch-specific symbol to asm/acpi.h
  ACPI / tables: table upgrade: refactor function definitions
  ACPI / tables: table upgrade: use cacheable map for tables

Conflicts:
	arch/arm64/include/asm/acpi.h
parents d85f4eb6 fafe5306
What: /config/acpi
Date: July 2016
KernelVersion: 4.8
Contact: linux-acpi@vger.kernel.org
Description:
This represents the ACPI subsystem entry point directory. It
contains sub-groups corresponding to ACPI configurable options.
What: /config/acpi/table
Date: July 2016
KernelVersion: 4.8
Description:
This group contains the configuration for user defined ACPI
tables. The attributes of a user define table are:
aml - a binary attribute that the user can use to
fill in the ACPI aml definitions. Once the aml
data is written to this file and the file is
closed the table will be loaded and ACPI devices
will be enumerated. To check if the operation is
successful the user must check the error code
for close(). If the operation is successful,
subsequent writes to this attribute will fail.
The rest of the attributes are read-only and are valid only
after the table has been loaded by filling the aml entry:
signature - ASCII table signature
length - length of table in bytes, including the header
revision - ACPI Specification minor version number
oem_id - ASCII OEM identification
oem_table_id - ASCII OEM table identification
oem_revision - OEM revision number
asl_compiler_id - ASCII ASL compiler vendor ID
asl_compiler_revision - ASL compiler version
In order to support ACPI open-ended hardware configurations (e.g. development
boards) we need a way to augment the ACPI configuration provided by the firmware
image. A common example is connecting sensors on I2C / SPI buses on development
boards.
Although this can be accomplished by creating a kernel platform driver or
recompiling the firmware image with updated ACPI tables, neither is practical:
the former proliferates board specific kernel code while the latter requires
access to firmware tools which are often not publicly available.
Because ACPI supports external references in AML code a more practical
way to augment firmware ACPI configuration is by dynamically loading
user defined SSDT tables that contain the board specific information.
For example, to enumerate a Bosch BMA222E accelerometer on the I2C bus of the
Minnowboard MAX development board exposed via the LSE connector [1], the
following ASL code can be used:
DefinitionBlock ("minnowmax.aml", "SSDT", 1, "Vendor", "Accel", 0x00000003)
{
External (\_SB.I2C6, DeviceObj)
Scope (\_SB.I2C6)
{
Device (STAC)
{
Name (_ADR, Zero)
Name (_HID, "BMA222E")
Method (_CRS, 0, Serialized)
{
Name (RBUF, ResourceTemplate ()
{
I2cSerialBus (0x0018, ControllerInitiated, 0x00061A80,
AddressingMode7Bit, "\\_SB.I2C6", 0x00,
ResourceConsumer, ,)
GpioInt (Edge, ActiveHigh, Exclusive, PullDown, 0x0000,
"\\_SB.GPO2", 0x00, ResourceConsumer, , )
{ // Pin list
0
}
})
Return (RBUF)
}
}
}
}
which can then be compiled to AML binary format:
$ iasl minnowmax.asl
Intel ACPI Component Architecture
ASL Optimizing Compiler version 20140214-64 [Mar 29 2014]
Copyright (c) 2000 - 2014 Intel Corporation
ASL Input: minnomax.asl - 30 lines, 614 bytes, 7 keywords
AML Output: minnowmax.aml - 165 bytes, 6 named objects, 1 executable opcodes
[1] http://wiki.minnowboard.org/MinnowBoard_MAX#Low_Speed_Expansion_Connector_.28Top.29
The resulting AML code can then be loaded by the kernel using one of the methods
below.
== Loading ACPI SSDTs from initrd ==
This option allows loading of user defined SSDTs from initrd and it is useful
when the system does not support EFI or when there is not enough EFI storage.
It works in a similar way with initrd based ACPI tables override/upgrade: SSDT
aml code must be placed in the first, uncompressed, initrd under the
"kernel/firmware/acpi" path. Multiple files can be used and this will translate
in loading multiple tables. Only SSDT and OEM tables are allowed. See
initrd_table_override.txt for more details.
Here is an example:
# Add the raw ACPI tables to an uncompressed cpio archive.
# They must be put into a /kernel/firmware/acpi directory inside the
# cpio archive.
# The uncompressed cpio archive must be the first.
# Other, typically compressed cpio archives, must be
# concatenated on top of the uncompressed one.
mkdir -p kernel/firmware/acpi
cp ssdt.aml kernel/firmware/acpi
# Create the uncompressed cpio archive and concatenate the original initrd
# on top:
find kernel | cpio -H newc --create > /boot/instrumented_initrd
cat /boot/initrd >>/boot/instrumented_initrd
== Loading ACPI SSDTs from EFI variables ==
This is the preferred method, when EFI is supported on the platform, because it
allows a persistent, OS independent way of storing the user defined SSDTs. There
is also work underway to implement EFI support for loading user defined SSDTs
and using this method will make it easier to convert to the EFI loading
mechanism when that will arrive.
In order to load SSDTs from an EFI variable the efivar_ssdt kernel command line
parameter can be used. The argument for the option is the variable name to
use. If there are multiple variables with the same name but with different
vendor GUIDs, all of them will be loaded.
In order to store the AML code in an EFI variable the efivarfs filesystem can be
used. It is enabled and mounted by default in /sys/firmware/efi/efivars in all
recent distribution.
Creating a new file in /sys/firmware/efi/efivars will automatically create a new
EFI variable. Updating a file in /sys/firmware/efi/efivars will update the EFI
variable. Please note that the file name needs to be specially formatted as
"Name-GUID" and that the first 4 bytes in the file (little-endian format)
represent the attributes of the EFI variable (see EFI_VARIABLE_MASK in
include/linux/efi.h). Writing to the file must also be done with one write
operation.
For example, you can use the following bash script to create/update an EFI
variable with the content from a given file:
#!/bin/sh -e
while ! [ -z "$1" ]; do
case "$1" in
"-f") filename="$2"; shift;;
"-g") guid="$2"; shift;;
*) name="$1";;
esac
shift
done
usage()
{
echo "Syntax: ${0##*/} -f filename [ -g guid ] name"
exit 1
}
[ -n "$name" -a -f "$filename" ] || usage
EFIVARFS="/sys/firmware/efi/efivars"
[ -d "$EFIVARFS" ] || exit 2
if stat -tf $EFIVARFS | grep -q -v de5e81e4; then
mount -t efivarfs none $EFIVARFS
fi
# try to pick up an existing GUID
[ -n "$guid" ] || guid=$(find "$EFIVARFS" -name "$name-*" | head -n1 | cut -f2- -d-)
# use a randomly generated GUID
[ -n "$guid" ] || guid="$(cat /proc/sys/kernel/random/uuid)"
# efivarfs expects all of the data in one write
tmp=$(mktemp)
/bin/echo -ne "\007\000\000\000" | cat - $filename > $tmp
dd if=$tmp of="$EFIVARFS/$name-$guid" bs=$(stat -c %s $tmp)
rm $tmp
== Loading ACPI SSDTs from configfs ==
This option allows loading of user defined SSDTs from userspace via the configfs
interface. The CONFIG_ACPI_CONFIGFS option must be select and configfs must be
mounted. In the following examples, we assume that configfs has been mounted in
/config.
New tables can be loading by creating new directories in /config/acpi/table/ and
writing the SSDT aml code in the aml attribute:
cd /config/acpi/table
mkdir my_ssdt
cat ~/ssdt.aml > my_ssdt/aml
......@@ -1185,6 +1185,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Address Range Mirroring feature even if your box
doesn't support it.
efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
that is to be dynamically loaded by Linux. If there are
multiple variables with the same name but with different
vendor GUIDs, all of them will be loaded. See
Documentation/acpi/ssdt-overlays.txt for details.
eisa_irq_edge= [PARISC,HW]
See header of drivers/parisc/eisa.c.
......
......@@ -288,6 +288,7 @@ F: include/linux/acpi.h
F: include/acpi/
F: Documentation/acpi/
F: Documentation/ABI/testing/sysfs-bus-acpi
F: Documentation/ABI/testing/configfs-acpi
F: drivers/pci/*acpi*
F: drivers/pci/*/*acpi*
F: drivers/pci/*/*/*acpi*
......
......@@ -4,6 +4,7 @@ config ARM64
select ACPI_GENERIC_GSI if ACPI
select ACPI_REDUCED_HARDWARE_ONLY if ACPI
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_GCOV_PROFILE_ALL
......
......@@ -121,4 +121,6 @@ static inline int arm64_acpi_numa_init(void) { return -ENOSYS; }
static inline int acpi_numa_get_nid(unsigned int cpu, u64 hwid) { return NUMA_NO_NODE; }
#endif /* CONFIG_ACPI_NUMA */
#define ACPI_TABLE_UPGRADE_MAX_PHYS MEMBLOCK_ALLOC_ACCESSIBLE
#endif /*_ASM_ACPI_H*/
......@@ -260,11 +260,13 @@ void __init setup_arch(char **cmdline_p)
efi_init();
arm64_memblock_init();
paging_init();
acpi_table_upgrade();
/* Parse the ACPI tables for possible boot-time configuration */
acpi_boot_table_init();
paging_init();
if (acpi_disabled)
unflatten_device_tree();
......
......@@ -22,6 +22,7 @@ config X86
select ANON_INODES
select ARCH_CLOCKSOURCE_DATA
select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_DEVMEM_IS_ALLOWED
......
......@@ -169,4 +169,6 @@ static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
}
#endif
#define ACPI_TABLE_UPGRADE_MAX_PHYS (max_low_pfn_mapped << PAGE_SHIFT)
#endif /* _ASM_X86_ACPI_H */
......@@ -399,10 +399,6 @@ static void __init reserve_initrd(void)
memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
}
static void __init early_initrd_acpi_init(void)
{
early_acpi_table_init((void *)initrd_start, initrd_end - initrd_start);
}
#else
static void __init early_reserve_initrd(void)
{
......@@ -410,9 +406,6 @@ static void __init early_reserve_initrd(void)
static void __init reserve_initrd(void)
{
}
static void __init early_initrd_acpi_init(void)
{
}
#endif /* CONFIG_BLK_DEV_INITRD */
static void __init parse_setup_data(void)
......@@ -1146,7 +1139,7 @@ void __init setup_arch(char **cmdline_p)
reserve_initrd();
early_initrd_acpi_init();
acpi_table_upgrade();
vsmp_init();
......
......@@ -311,9 +311,12 @@ config ACPI_CUSTOM_DSDT
bool
default ACPI_CUSTOM_DSDT_FILE != ""
config ARCH_HAS_ACPI_TABLE_UPGRADE
def_bool n
config ACPI_TABLE_UPGRADE
bool "Allow upgrading ACPI tables via initrd"
depends on BLK_DEV_INITRD && X86
depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
default y
help
This option provides functionality to upgrade arbitrary ACPI tables
......@@ -521,4 +524,12 @@ config XPOWER_PMIC_OPREGION
endif
config ACPI_CONFIGFS
tristate "ACPI configfs support"
select CONFIGFS_FS
help
Select this option to enable support for ACPI configuration from
userspace. The configurable ACPI groups will be visible under
/config/acpi, assuming configfs is mounted under /config.
endif # ACPI
......@@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
obj-$(CONFIG_ACPI_CONFIGFS) += acpi_configfs.o
video-objs += acpi_video.o video_detect.o
/*
* ACPI configfs support
*
* Copyright (c) 2016 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#define pr_fmt(fmt) "ACPI configfs: " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/acpi.h>
static struct config_group *acpi_table_group;
struct acpi_table {
struct config_item cfg;
struct acpi_table_header *header;
};
static ssize_t acpi_table_aml_write(struct config_item *cfg,
const void *data, size_t size)
{
const struct acpi_table_header *header = data;
struct acpi_table *table;
int ret;
table = container_of(cfg, struct acpi_table, cfg);
if (table->header) {
pr_err("table already loaded\n");
return -EBUSY;
}
if (header->length != size) {
pr_err("invalid table length\n");
return -EINVAL;
}
if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
pr_err("invalid table signature\n");
return -EINVAL;
}
table = container_of(cfg, struct acpi_table, cfg);
table->header = kmemdup(header, header->length, GFP_KERNEL);
if (!table->header)
return -ENOMEM;
ret = acpi_load_table(table->header);
if (ret) {
kfree(table->header);
table->header = NULL;
}
return ret;
}
static inline struct acpi_table_header *get_header(struct config_item *cfg)
{
struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
if (!table->header)
pr_err("table not loaded\n");
return table->header;
}
static ssize_t acpi_table_aml_read(struct config_item *cfg,
void *data, size_t size)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
if (data)
memcpy(data, h, h->length);
return h->length;
}
#define MAX_ACPI_TABLE_SIZE (128 * 1024)
CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);
struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
&acpi_table_attr_aml,
NULL,
};
ssize_t acpi_table_signature_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature);
}
ssize_t acpi_table_length_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%d\n", h->length);
}
ssize_t acpi_table_revision_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%d\n", h->revision);
}
ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
}
ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
}
ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%d\n", h->oem_revision);
}
ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg, char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
}
ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
char *str)
{
struct acpi_table_header *h = get_header(cfg);
if (!h)
return -EINVAL;
return sprintf(str, "%d\n", h->asl_compiler_revision);
}
CONFIGFS_ATTR_RO(acpi_table_, signature);
CONFIGFS_ATTR_RO(acpi_table_, length);
CONFIGFS_ATTR_RO(acpi_table_, revision);
CONFIGFS_ATTR_RO(acpi_table_, oem_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
struct configfs_attribute *acpi_table_attrs[] = {
&acpi_table_attr_signature,
&acpi_table_attr_length,
&acpi_table_attr_revision,
&acpi_table_attr_oem_id,
&acpi_table_attr_oem_table_id,
&acpi_table_attr_oem_revision,
&acpi_table_attr_asl_compiler_id,
&acpi_table_attr_asl_compiler_revision,
NULL,
};
static struct config_item_type acpi_table_type = {
.ct_owner = THIS_MODULE,
.ct_bin_attrs = acpi_table_bin_attrs,
.ct_attrs = acpi_table_attrs,
};
static struct config_item *acpi_table_make_item(struct config_group *group,
const char *name)
{
struct acpi_table *table;
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
return ERR_PTR(-ENOMEM);
config_item_init_type_name(&table->cfg, name, &acpi_table_type);
return &table->cfg;
}
struct configfs_group_operations acpi_table_group_ops = {
.make_item = acpi_table_make_item,
};
static struct config_item_type acpi_tables_type = {
.ct_owner = THIS_MODULE,
.ct_group_ops = &acpi_table_group_ops,
};
static struct config_item_type acpi_root_group_type = {
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem acpi_configfs = {
.su_group = {
.cg_item = {
.ci_namebuf = "acpi",
.ci_type = &acpi_root_group_type,
},
},
.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
};
static int __init acpi_configfs_init(void)
{
int ret;
struct config_group *root = &acpi_configfs.su_group;
config_group_init(root);
ret = configfs_register_subsystem(&acpi_configfs);
if (ret)
return ret;
acpi_table_group = configfs_register_default_group(root, "table",
&acpi_tables_type);
return PTR_ERR_OR_ZERO(acpi_table_group);
}
module_init(acpi_configfs_init);
static void __exit acpi_configfs_exit(void)
{
configfs_unregister_default_group(acpi_table_group);
configfs_unregister_subsystem(&acpi_configfs);
}
module_exit(acpi_configfs_exit);
MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
MODULE_DESCRIPTION("ACPI configfs support");
MODULE_LICENSE("GPL v2");
......@@ -990,6 +990,13 @@ void __init acpi_subsystem_init(void)
}
}
static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
{
acpi_scan_table_handler(event, table, context);
return acpi_sysfs_table_handler(event, table, context);
}
static int __init acpi_bus_init(void)
{
int result;
......@@ -1043,6 +1050,8 @@ static int __init acpi_bus_init(void)
* _PDC control method may load dynamic SSDT tables,
* and we need to install the table handler before that.
*/
status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
acpi_sysfs_init();
acpi_early_processor_set_pdc();
......
......@@ -87,6 +87,9 @@ bool acpi_queue_hotplug_work(struct work_struct *work);
void acpi_device_hotplug(struct acpi_device *adev, u32 src);
bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent);
acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context);
void acpi_scan_table_handler(u32 event, void *table, void *context);
/* --------------------------------------------------------------------------
Device Node Initialization / Removal
-------------------------------------------------------------------------- */
......
......@@ -494,6 +494,8 @@ static void acpi_device_del(struct acpi_device *device)
device_del(&device->dev);
}
static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
static LIST_HEAD(acpi_device_del_list);
static DEFINE_MUTEX(acpi_device_del_lock);
......@@ -514,6 +516,9 @@ static void acpi_device_del_work_fn(struct work_struct *work_not_used)
mutex_unlock(&acpi_device_del_lock);
blocking_notifier_call_chain(&acpi_reconfig_chain,
ACPI_RECONFIG_DEVICE_REMOVE, adev);
acpi_device_del(adev);
/*
* Drop references to all power resources that might have been
......@@ -1406,7 +1411,7 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
acpi_bus_get_flags(device);
device->flags.match_driver = false;
device->flags.initialized = true;
device->flags.visited = false;
acpi_device_clear_enumerated(device);
device_initialize(&device->dev);
dev_set_uevent_suppress(&device->dev, true);
acpi_init_coherency(device);
......@@ -1676,15 +1681,20 @@ static void acpi_default_enumeration(struct acpi_device *device)
bool is_spi_i2c_slave = false;
/*
* Do not enemerate SPI/I2C slaves as they will be enuerated by their
* Do not enumerate SPI/I2C slaves as they will be enumerated by their
* respective parents.
*/
INIT_LIST_HEAD(&resource_list);
acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
&is_spi_i2c_slave);
acpi_dev_free_resource_list(&resource_list);
if (!is_spi_i2c_slave)
if (!is_spi_i2c_slave) {
acpi_create_platform_device(device);
acpi_device_set_enumerated(device);
} else {
blocking_notifier_call_chain(&acpi_reconfig_chain,
ACPI_RECONFIG_DEVICE_ADD, device);
}
}
static const struct acpi_device_id generic_device_ids[] = {
......@@ -1751,7 +1761,7 @@ static void acpi_bus_attach(struct acpi_device *device)
acpi_bus_get_status(device);
/* Skip devices that are not present. */
if (!acpi_device_is_present(device)) {
device->flags.visited = false;
acpi_device_clear_enumerated(device);
device->flags.power_manageable = 0;
return;
}
......@@ -1766,7 +1776,7 @@ static void acpi_bus_attach(struct acpi_device *device)
device->flags.initialized = true;
}
device->flags.visited = false;
ret = acpi_scan_attach_handler(device);
if (ret < 0)
return;
......@@ -1780,7 +1790,6 @@ static void acpi_bus_attach(struct acpi_device *device)
if (!ret && device->pnp.type.platform_id)
acpi_default_enumeration(device);
}
device->flags.visited = true;
ok:
list_for_each_entry(child, &device->children, node)
......@@ -1872,7 +1881,7 @@ void acpi_bus_trim(struct acpi_device *adev)
*/
acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
adev->flags.initialized = false;
adev->flags.visited = false;
acpi_device_clear_enumerated(adev);
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);
......@@ -1916,6 +1925,8 @@ static int acpi_bus_scan_fixed(void)
return result < 0 ? result : 0;
}
static bool acpi_scan_initialized;
int __init acpi_scan_init(void)
{
int result;
......@@ -1960,6 +1971,8 @@ int __init acpi_scan_init(void)
acpi_update_all_gpes();
acpi_scan_initialized = true;
out:
mutex_unlock(&acpi_scan_lock);
return result;
......@@ -2003,3 +2016,57 @@ int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
return count;
}
struct acpi_table_events_work {
struct work_struct work;
void *table;
u32 event;
};
static void acpi_table_events_fn(struct work_struct *work)
{
struct acpi_table_events_work *tew;
tew = container_of(work, struct acpi_table_events_work, work);
if (tew->event == ACPI_TABLE_EVENT_LOAD) {
acpi_scan_lock_acquire();
acpi_bus_scan(ACPI_ROOT_OBJECT);
acpi_scan_lock_release();
}
kfree(tew);
}
void acpi_scan_table_handler(u32 event, void *table, void *context)
{
struct acpi_table_events_work *tew;
if (!acpi_scan_initialized)
return;
if (event != ACPI_TABLE_EVENT_LOAD)
return;
tew = kmalloc(sizeof(*tew), GFP_KERNEL);
if (!tew)
return;
INIT_WORK(&tew->work, acpi_table_events_fn);
tew->table = table;
tew->event = event;
schedule_work(&tew->work);
}
int acpi_reconfig_notifier_register(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
}
EXPORT_SYMBOL(acpi_reconfig_notifier_register);
int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
}
EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
......@@ -378,8 +378,7 @@ static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
return;
}
static acpi_status
acpi_sysfs_table_handler(u32 event, void *table, void *context)
acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context)
{
struct acpi_table_attr *table_attr;
......@@ -452,9 +451,8 @@ static int acpi_tables_sysfs_init(void)
kobject_uevent(tables_kobj, KOBJ_ADD);
kobject_uevent(dynamic_tables_kobj, KOBJ_ADD);
status = acpi_install_table_handler(acpi_sysfs_table_handler, NULL);
return ACPI_FAILURE(status) ? -EINVAL : 0;
return 0;
err_dynamic_tables:
kobject_put(tables_kobj);
err:
......
......@@ -34,6 +34,8 @@
#include <linux/bootmem.h>
#include <linux/earlycpio.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/acpi.h>
#include "internal.h"
#ifdef CONFIG_ACPI_CUSTOM_DSDT
......@@ -481,8 +483,10 @@ static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES);
#define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
static void __init acpi_table_initrd_init(void *data, size_t size)
void __init acpi_table_upgrade(void)
{
void *data = (void *)initrd_start;
size_t size = initrd_end - initrd_start;
int sig, no, table_nr = 0, total_offset = 0;
long offset = 0;
struct acpi_table_header *table;
......@@ -540,7 +544,7 @@ static void __init acpi_table_initrd_init(void *data, size_t size)
return;
acpi_tables_addr =
memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
all_tables_size, PAGE_SIZE);
if (!acpi_tables_addr) {
WARN_ON(1);
......@@ -578,10 +582,10 @@ static void __init acpi_table_initrd_init(void *data, size_t size)
clen = size;
if (clen > MAP_CHUNK_SIZE - slop)
clen = MAP_CHUNK_SIZE - slop;
dest_p = early_ioremap(dest_addr & PAGE_MASK,
dest_p = early_memremap(dest_addr & PAGE_MASK,
clen + slop);
memcpy(dest_p + slop, src_p, clen);
early_iounmap(dest_p, clen + slop);
early_memunmap(dest_p, clen + slop);
src_p += clen;
dest_addr += clen;
size -= clen;
......@@ -696,10 +700,6 @@ static void __init acpi_table_initrd_scan(void)
}
}
#else
static void __init acpi_table_initrd_init(void *data, size_t size)
{
}
static acpi_status
acpi_table_initrd_override(struct acpi_table_header *existing_table,
acpi_physical_address *address,
......@@ -742,11 +742,6 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
return AE_OK;
}
void __init early_acpi_table_init(void *data, size_t size)
{
acpi_table_initrd_init(data, size);
}
/*
* acpi_table_init()
*
......
......@@ -24,6 +24,9 @@
#include <linux/of_fdt.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/ucs2_string.h>
#include <asm/early_ioremap.h>
......@@ -195,6 +198,96 @@ static void generic_ops_unregister(void)
efivars_unregister(&generic_efivars);
}
#if IS_ENABLED(CONFIG_ACPI)
#define EFIVAR_SSDT_NAME_MAX 16
static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
static int __init efivar_ssdt_setup(char *str)
{
if (strlen(str) < sizeof(efivar_ssdt))
memcpy(efivar_ssdt, str, strlen(str));
else
pr_warn("efivar_ssdt: name too long: %s\n", str);
return 0;
}
__setup("efivar_ssdt=", efivar_ssdt_setup);
static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor,
unsigned long name_size, void *data)
{
struct efivar_entry *entry;
struct list_head *list = data;
char utf8_name[EFIVAR_SSDT_NAME_MAX];
int limit = min_t(unsigned long, EFIVAR_SSDT_NAME_MAX, name_size);
ucs2_as_utf8(utf8_name, name, limit - 1);
if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
return 0;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return 0;
memcpy(entry->var.VariableName, name, name_size);
memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t));
efivar_entry_add(entry, list);
return 0;
}
static __init int efivar_ssdt_load(void)
{
LIST_HEAD(entries);
struct efivar_entry *entry, *aux;
unsigned long size;
void *data;
int ret;
ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries);
list_for_each_entry_safe(entry, aux, &entries, list) {
pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt,
&entry->var.VendorGuid);
list_del(&entry->list);
ret = efivar_entry_size(entry, &size);
if (ret) {
pr_err("failed to get var size\n");
goto free_entry;
}
data = kmalloc(size, GFP_KERNEL);
if (!data)
goto free_entry;
ret = efivar_entry_get(entry, NULL, &size, data);
if (ret) {
pr_err("failed to get var data\n");
goto free_data;
}
ret = acpi_load_table(data);
if (ret) {
pr_err("failed to load table: %d\n", ret);
goto free_data;
}
goto free_entry;
free_data:
kfree(data);
free_entry:
kfree(entry);
}
return ret;
}
#else
static inline int efivar_ssdt_load(void) { return 0; }
#endif
/*
* We register the efi subsystem with the firmware subsystem and the
* efivars subsystem with the efi subsystem, if the system was booted with
......@@ -218,6 +311,9 @@ static int __init efisubsys_init(void)
if (error)
goto err_put;
if (efi_enabled(EFI_RUNTIME_SERVICES))
efivar_ssdt_load();
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
if (error) {
pr_err("efi: Sysfs attribute export failed with error %d.\n",
......
......@@ -107,12 +107,11 @@ struct acpi_i2c_lookup {
acpi_handle device_handle;
};
static int acpi_i2c_find_address(struct acpi_resource *ares, void *data)
static int acpi_i2c_fill_info(struct acpi_resource *ares, void *data)
{
struct acpi_i2c_lookup *lookup = data;
struct i2c_board_info *info = lookup->info;
struct acpi_resource_i2c_serialbus *sb;
acpi_handle adapter_handle;
acpi_status status;
if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
......@@ -122,80 +121,102 @@ static int acpi_i2c_find_address(struct acpi_resource *ares, void *data)
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
return 1;
/*
* Extract the ResourceSource and make sure that the handle matches
* with the I2C adapter handle.
*/
status = acpi_get_handle(lookup->device_handle,
sb->resource_source.string_ptr,
&adapter_handle);
if (ACPI_SUCCESS(status) && adapter_handle == lookup->adapter_handle) {
&lookup->adapter_handle);
if (!ACPI_SUCCESS(status))
return 1;
info->addr = sb->slave_address;
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
info->flags |= I2C_CLIENT_TEN;
}
return 1;
}
static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
void *data, void **return_value)
static int acpi_i2c_get_info(struct acpi_device *adev,
struct i2c_board_info *info,
acpi_handle *adapter_handle)
{
struct i2c_adapter *adapter = data;
struct list_head resource_list;
struct acpi_i2c_lookup lookup;
struct resource_entry *entry;
struct i2c_board_info info;
struct acpi_device *adev;
struct acpi_i2c_lookup lookup;
int ret;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (acpi_bus_get_status(adev) || !adev->status.present)
return AE_OK;
if (acpi_bus_get_status(adev) || !adev->status.present ||
acpi_device_enumerated(adev))
return -EINVAL;
memset(&info, 0, sizeof(info));
info.fwnode = acpi_fwnode_handle(adev);
memset(info, 0, sizeof(*info));
info->fwnode = acpi_fwnode_handle(adev);
memset(&lookup, 0, sizeof(lookup));
lookup.adapter_handle = ACPI_HANDLE(&adapter->dev);
lookup.device_handle = handle;
lookup.info = &info;
lookup.device_handle = acpi_device_handle(adev);
lookup.info = info;
/*
* Look up for I2cSerialBus resource with ResourceSource that
* matches with this adapter.
*/
/* Look up for I2cSerialBus resource */
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list,
acpi_i2c_find_address, &lookup);
acpi_i2c_fill_info, &lookup);
acpi_dev_free_resource_list(&resource_list);
if (ret < 0 || !info.addr)
return AE_OK;
if (ret < 0 || !info->addr)
return -EINVAL;
*adapter_handle = lookup.adapter_handle;
/* Then fill IRQ number if any */
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
if (ret < 0)
return AE_OK;
return -EINVAL;
resource_list_for_each_entry(entry, &resource_list) {
if (resource_type(entry->res) == IORESOURCE_IRQ) {
info.irq = entry->res->start;
info->irq = entry->res->start;
break;
}
}
acpi_dev_free_resource_list(&resource_list);
strlcpy(info->type, dev_name(&adev->dev), sizeof(info->type));
return 0;
}
static void acpi_i2c_register_device(struct i2c_adapter *adapter,
struct acpi_device *adev,
struct i2c_board_info *info)
{
adev->power.flags.ignore_parent = true;
strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
if (!i2c_new_device(adapter, &info)) {
acpi_device_set_enumerated(adev);
if (!i2c_new_device(adapter, info)) {
adev->power.flags.ignore_parent = false;
dev_err(&adapter->dev,
"failed to add I2C device %s from ACPI\n",
dev_name(&adev->dev));
}
}
static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
void *data, void **return_value)
{
struct i2c_adapter *adapter = data;
struct acpi_device *adev;
acpi_handle adapter_handle;
struct i2c_board_info info;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (acpi_i2c_get_info(adev, &info, &adapter_handle))
return AE_OK;
if (adapter_handle != ACPI_HANDLE(&adapter->dev))
return AE_OK;
acpi_i2c_register_device(adapter, adev, &info);
return AE_OK;
}
......@@ -225,8 +246,80 @@ static void acpi_i2c_register_devices(struct i2c_adapter *adap)
dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
}
static int acpi_i2c_match_adapter(struct device *dev, void *data)
{
struct i2c_adapter *adapter = i2c_verify_adapter(dev);
if (!adapter)
return 0;
return ACPI_HANDLE(dev) == (acpi_handle)data;
}
static int acpi_i2c_match_device(struct device *dev, void *data)
{
return ACPI_COMPANION(dev) == data;
}
static struct i2c_adapter *acpi_i2c_find_adapter_by_handle(acpi_handle handle)
{
struct device *dev;
dev = bus_find_device(&i2c_bus_type, NULL, handle,
acpi_i2c_match_adapter);
return dev ? i2c_verify_adapter(dev) : NULL;
}
static struct i2c_client *acpi_i2c_find_client_by_adev(struct acpi_device *adev)
{
struct device *dev;
dev = bus_find_device(&i2c_bus_type, NULL, adev, acpi_i2c_match_device);
return dev ? i2c_verify_client(dev) : NULL;
}
static int acpi_i2c_notify(struct notifier_block *nb, unsigned long value,
void *arg)
{
struct acpi_device *adev = arg;
struct i2c_board_info info;
acpi_handle adapter_handle;
struct i2c_adapter *adapter;
struct i2c_client *client;
switch (value) {
case ACPI_RECONFIG_DEVICE_ADD:
if (acpi_i2c_get_info(adev, &info, &adapter_handle))
break;
adapter = acpi_i2c_find_adapter_by_handle(adapter_handle);
if (!adapter)
break;
acpi_i2c_register_device(adapter, adev, &info);
break;
case ACPI_RECONFIG_DEVICE_REMOVE:
if (!acpi_device_enumerated(adev))
break;
client = acpi_i2c_find_client_by_adev(adev);
if (!client)
break;
i2c_unregister_device(client);
put_device(&client->dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block i2c_acpi_notifier = {
.notifier_call = acpi_i2c_notify,
};
#else /* CONFIG_ACPI */
static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) { }
extern struct notifier_block i2c_acpi_notifier;
#endif /* CONFIG_ACPI */
#ifdef CONFIG_ACPI_I2C_OPREGION
......@@ -1089,6 +1182,8 @@ void i2c_unregister_device(struct i2c_client *client)
{
if (client->dev.of_node)
of_node_clear_flag(client->dev.of_node, OF_POPULATED);
if (ACPI_COMPANION(&client->dev))
acpi_device_clear_enumerated(ACPI_COMPANION(&client->dev));
device_unregister(&client->dev);
}
EXPORT_SYMBOL_GPL(i2c_unregister_device);
......@@ -2117,6 +2212,8 @@ static int __init i2c_init(void)
if (IS_ENABLED(CONFIG_OF_DYNAMIC))
WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier));
if (IS_ENABLED(CONFIG_ACPI))
WARN_ON(acpi_reconfig_notifier_register(&i2c_acpi_notifier));
return 0;
......@@ -2132,6 +2229,8 @@ static int __init i2c_init(void)
static void __exit i2c_exit(void)
{
if (IS_ENABLED(CONFIG_ACPI))
WARN_ON(acpi_reconfig_notifier_unregister(&i2c_acpi_notifier));
if (IS_ENABLED(CONFIG_OF_DYNAMIC))
WARN_ON(of_reconfig_notifier_unregister(&i2c_of_notifier));
i2c_del_driver(&dummy_driver);
......
......@@ -622,6 +622,8 @@ void spi_unregister_device(struct spi_device *spi)
if (spi->dev.of_node)
of_node_clear_flag(spi->dev.of_node, OF_POPULATED);
if (ACPI_COMPANION(&spi->dev))
acpi_device_clear_enumerated(ACPI_COMPANION(&spi->dev));
device_unregister(&spi->dev);
}
EXPORT_SYMBOL_GPL(spi_unregister_device);
......@@ -1646,18 +1648,15 @@ static int acpi_spi_add_resource(struct acpi_resource *ares, void *data)
return 1;
}
static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
void *data, void **return_value)
static acpi_status acpi_register_spi_device(struct spi_master *master,
struct acpi_device *adev)
{
struct spi_master *master = data;
struct list_head resource_list;
struct acpi_device *adev;
struct spi_device *spi;
int ret;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (acpi_bus_get_status(adev) || !adev->status.present)
if (acpi_bus_get_status(adev) || !adev->status.present ||
acpi_device_enumerated(adev))
return AE_OK;
spi = spi_alloc_device(master);
......@@ -1683,6 +1682,8 @@ static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
if (spi->irq < 0)
spi->irq = acpi_dev_gpio_irq_get(adev, 0);
acpi_device_set_enumerated(adev);
adev->power.flags.ignore_parent = true;
strlcpy(spi->modalias, acpi_device_hid(adev), sizeof(spi->modalias));
if (spi_add_device(spi)) {
......@@ -1695,6 +1696,18 @@ static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
return AE_OK;
}
static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,
void *data, void **return_value)
{
struct spi_master *master = data;
struct acpi_device *adev;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
return acpi_register_spi_device(master, adev);
}
static void acpi_register_spi_devices(struct spi_master *master)
{
acpi_status status;
......@@ -3107,6 +3120,77 @@ static struct notifier_block spi_of_notifier = {
extern struct notifier_block spi_of_notifier;
#endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */
#if IS_ENABLED(CONFIG_ACPI)
static int spi_acpi_master_match(struct device *dev, const void *data)
{
return ACPI_COMPANION(dev->parent) == data;
}
static int spi_acpi_device_match(struct device *dev, void *data)
{
return ACPI_COMPANION(dev) == data;
}
static struct spi_master *acpi_spi_find_master_by_adev(struct acpi_device *adev)
{
struct device *dev;
dev = class_find_device(&spi_master_class, NULL, adev,
spi_acpi_master_match);
if (!dev)
return NULL;
return container_of(dev, struct spi_master, dev);
}
static struct spi_device *acpi_spi_find_device_by_adev(struct acpi_device *adev)
{
struct device *dev;
dev = bus_find_device(&spi_bus_type, NULL, adev, spi_acpi_device_match);
return dev ? to_spi_device(dev) : NULL;
}
static int acpi_spi_notify(struct notifier_block *nb, unsigned long value,
void *arg)
{
struct acpi_device *adev = arg;
struct spi_master *master;
struct spi_device *spi;
switch (value) {
case ACPI_RECONFIG_DEVICE_ADD:
master = acpi_spi_find_master_by_adev(adev->parent);
if (!master)
break;
acpi_register_spi_device(master, adev);
put_device(&master->dev);
break;
case ACPI_RECONFIG_DEVICE_REMOVE:
if (!acpi_device_enumerated(adev))
break;
spi = acpi_spi_find_device_by_adev(adev);
if (!spi)
break;
spi_unregister_device(spi);
put_device(&spi->dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block spi_acpi_notifier = {
.notifier_call = acpi_spi_notify,
};
#else
extern struct notifier_block spi_acpi_notifier;
#endif
static int __init spi_init(void)
{
int status;
......@@ -3127,6 +3211,8 @@ static int __init spi_init(void)
if (IS_ENABLED(CONFIG_OF_DYNAMIC))
WARN_ON(of_reconfig_notifier_register(&spi_of_notifier));
if (IS_ENABLED(CONFIG_ACPI))
WARN_ON(acpi_reconfig_notifier_register(&spi_acpi_notifier));
return 0;
......
......@@ -208,7 +208,6 @@ void acpi_boot_table_init (void);
int acpi_mps_check (void);
int acpi_numa_init (void);
void early_acpi_table_init(void *data, size_t size);
int acpi_table_init (void);
int acpi_table_parse(char *id, acpi_tbl_table_handler handler);
int __init acpi_parse_entries(char *id, unsigned long table_size,
......@@ -546,6 +545,24 @@ void acpi_walk_dep_device_list(acpi_handle handle);
struct platform_device *acpi_create_platform_device(struct acpi_device *);
#define ACPI_PTR(_ptr) (_ptr)
static inline void acpi_device_set_enumerated(struct acpi_device *adev)
{
adev->flags.visited = true;
}
static inline void acpi_device_clear_enumerated(struct acpi_device *adev)
{
adev->flags.visited = false;
}
enum acpi_reconfig_event {
ACPI_RECONFIG_DEVICE_ADD = 0,
ACPI_RECONFIG_DEVICE_REMOVE,
};
int acpi_reconfig_notifier_register(struct notifier_block *nb);
int acpi_reconfig_notifier_unregister(struct notifier_block *nb);
#else /* !CONFIG_ACPI */
#define acpi_disabled 1
......@@ -602,7 +619,6 @@ static inline const char *acpi_dev_name(struct acpi_device *adev)
return NULL;
}
static inline void early_acpi_table_init(void *data, size_t size) { }
static inline void acpi_early_init(void) { }
static inline void acpi_subsystem_init(void) { }
......@@ -692,6 +708,24 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
#define ACPI_PTR(_ptr) (NULL)
static inline void acpi_device_set_enumerated(struct acpi_device *adev)
{
}
static inline void acpi_device_clear_enumerated(struct acpi_device *adev)
{
}
static inline int acpi_reconfig_notifier_register(struct notifier_block *nb)
{
return -EINVAL;
}
static inline int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
{
return -EINVAL;
}
#endif /* !CONFIG_ACPI */
#ifdef CONFIG_ACPI
......@@ -1011,4 +1045,10 @@ static inline struct fwnode_handle *acpi_get_next_subnode(struct device *dev,
#define acpi_probe_device_table(t) ({ int __r = 0; __r;})
#endif
#ifdef CONFIG_ACPI_TABLE_UPGRADE
void acpi_table_upgrade(void);
#else
static inline void acpi_table_upgrade(void) { }
#endif
#endif /*_LINUX_ACPI_H*/
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment