linux/drivers/acpi/osl.c
Srinivas Pandruvada eeb2d80d50 ACPI / LPIT: Add Low Power Idle Table (LPIT) support
Add functionality to read LPIT table, which provides:

 - Sysfs interface to read residency counters via
   /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us
   /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us

Here the count "low_power_idle_cpu_residency_us" shows the time spent
by CPU package in low power state.  This is read via MSR interface,
which points to MSR for PKG C10.

Here the count "low_power_idle_system_residency_us" show the count the
system was in low power state. This is read via MMIO interface. This
is mapped to SLP_S0 residency on modern Intel systems. This residency
is achieved only when CPU is in PKG C10 and all functional blocks are
in low power state.

It is possible that none of the above counters present or anyone of the
counter present or all counters present.

For example: On my Kabylake system both of the above counters present.
After suspend to idle these counts updated and prints:

 6916179
 6998564

This counter can be read by tools like turbostat to display. Or it can
be used to debug, if modern systems are reaching desired low power state.

 - Provides an interface to read residency counter memory address

   This address can be used to get the base address of PMC memory
   mapped IO.  This is utilized by intel_pmc_core driver to print
   more debug information.

In addition, to avoid code duplication to read iomem, removed the read of
iomem from acpi_os_read_memory() in osl.c and made a common function
acpi_os_read_iomem(). This new function is used for reading iomem in
in both osl.c and acpi_lpit.c.

Link: http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11 15:38:10 +02:00

1753 lines
40 KiB
C

/*
* acpi_osl.c - OS-dependent functions ($Revision: 83 $)
*
* Copyright (C) 2000 Andrew Henroid
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (c) 2008 Intel Corporation
* Author: Matthew Wilcox <willy@linux.intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/jiffies.h>
#include <linux/semaphore.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include "internal.h"
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
struct acpi_os_dpc {
acpi_osd_exec_callback function;
void *context;
struct work_struct work;
};
#ifdef ENABLE_DEBUGGER
#include <linux/kdb.h>
/* stuff for debugger support */
int acpi_in_debugger;
EXPORT_SYMBOL(acpi_in_debugger);
#endif /*ENABLE_DEBUGGER */
static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
u32 pm1b_ctrl);
static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
u32 val_b);
static acpi_osd_handler acpi_irq_handler;
static void *acpi_irq_context;
static struct workqueue_struct *kacpid_wq;
static struct workqueue_struct *kacpi_notify_wq;
static struct workqueue_struct *kacpi_hotplug_wq;
static bool acpi_os_initialized;
unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
bool acpi_permanent_mmap = false;
/*
* This list of permanent mappings is for memory that may be accessed from
* interrupt context, where we can't do the ioremap().
*/
struct acpi_ioremap {
struct list_head list;
void __iomem *virt;
acpi_physical_address phys;
acpi_size size;
unsigned long refcount;
};
static LIST_HEAD(acpi_ioremaps);
static DEFINE_MUTEX(acpi_ioremap_lock);
static void __init acpi_request_region (struct acpi_generic_address *gas,
unsigned int length, char *desc)
{
u64 addr;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !length)
return;
/* Resources are never freed */
if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
request_region(addr, length, desc);
else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
request_mem_region(addr, length, desc);
}
static int __init acpi_reserve_resources(void)
{
acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
"ACPI PM1a_EVT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
"ACPI PM1b_EVT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
"ACPI PM1a_CNT_BLK");
acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
"ACPI PM1b_CNT_BLK");
if (acpi_gbl_FADT.pm_timer_length == 4)
acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
"ACPI PM2_CNT_BLK");
/* Length of GPE blocks must be a non-negative multiple of 2 */
if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
return 0;
}
fs_initcall_sync(acpi_reserve_resources);
void acpi_os_printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
acpi_os_vprintf(fmt, args);
va_end(args);
}
EXPORT_SYMBOL(acpi_os_printf);
void acpi_os_vprintf(const char *fmt, va_list args)
{
static char buffer[512];
vsprintf(buffer, fmt, args);
#ifdef ENABLE_DEBUGGER
if (acpi_in_debugger) {
kdb_printf("%s", buffer);
} else {
if (printk_get_level(buffer))
printk("%s", buffer);
else
printk(KERN_CONT "%s", buffer);
}
#else
if (acpi_debugger_write_log(buffer) < 0) {
if (printk_get_level(buffer))
printk("%s", buffer);
else
printk(KERN_CONT "%s", buffer);
}
#endif
}
#ifdef CONFIG_KEXEC
static unsigned long acpi_rsdp;
static int __init setup_acpi_rsdp(char *arg)
{
return kstrtoul(arg, 16, &acpi_rsdp);
}
early_param("acpi_rsdp", setup_acpi_rsdp);
#endif
acpi_physical_address __init acpi_os_get_root_pointer(void)
{
acpi_physical_address pa = 0;
#ifdef CONFIG_KEXEC
if (acpi_rsdp)
return acpi_rsdp;
#endif
if (efi_enabled(EFI_CONFIG_TABLES)) {
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
return efi.acpi20;
if (efi.acpi != EFI_INVALID_TABLE_ADDR)
return efi.acpi;
pr_err(PREFIX "System description tables not found\n");
} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
acpi_find_root_pointer(&pa);
}
return pa;
}
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup(acpi_physical_address phys, acpi_size size)
{
struct acpi_ioremap *map;
list_for_each_entry_rcu(map, &acpi_ioremaps, list)
if (map->phys <= phys &&
phys + size <= map->phys + map->size)
return map;
return NULL;
}
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static void __iomem *
acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
{
struct acpi_ioremap *map;
map = acpi_map_lookup(phys, size);
if (map)
return map->virt + (phys - map->phys);
return NULL;
}
void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
{
struct acpi_ioremap *map;
void __iomem *virt = NULL;
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup(phys, size);
if (map) {
virt = map->virt + (phys - map->phys);
map->refcount++;
}
mutex_unlock(&acpi_ioremap_lock);
return virt;
}
EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
static struct acpi_ioremap *
acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
list_for_each_entry_rcu(map, &acpi_ioremaps, list)
if (map->virt <= virt &&
virt + size <= map->virt + map->size)
return map;
return NULL;
}
#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
/* ioremap will take care of cache attributes */
#define should_use_kmap(pfn) 0
#else
#define should_use_kmap(pfn) page_is_ram(pfn)
#endif
static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
{
unsigned long pfn;
pfn = pg_off >> PAGE_SHIFT;
if (should_use_kmap(pfn)) {
if (pg_sz > PAGE_SIZE)
return NULL;
return (void __iomem __force *)kmap(pfn_to_page(pfn));
} else
return acpi_os_ioremap(pg_off, pg_sz);
}
static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
{
unsigned long pfn;
pfn = pg_off >> PAGE_SHIFT;
if (should_use_kmap(pfn))
kunmap(pfn_to_page(pfn));
else
iounmap(vaddr);
}
/**
* acpi_os_map_iomem - Get a virtual address for a given physical address range.
* @phys: Start of the physical address range to map.
* @size: Size of the physical address range to map.
*
* Look up the given physical address range in the list of existing ACPI memory
* mappings. If found, get a reference to it and return a pointer to it (its
* virtual address). If not found, map it, add it to that list and return a
* pointer to it.
*
* During early init (when acpi_permanent_mmap has not been set yet) this
* routine simply calls __acpi_map_table() to get the job done.
*/
void __iomem *__ref
acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
{
struct acpi_ioremap *map;
void __iomem *virt;
acpi_physical_address pg_off;
acpi_size pg_sz;
if (phys > ULONG_MAX) {
printk(KERN_ERR PREFIX "Cannot map memory that high\n");
return NULL;
}
if (!acpi_permanent_mmap)
return __acpi_map_table((unsigned long)phys, size);
mutex_lock(&acpi_ioremap_lock);
/* Check if there's a suitable mapping already. */
map = acpi_map_lookup(phys, size);
if (map) {
map->refcount++;
goto out;
}
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
return NULL;
}
pg_off = round_down(phys, PAGE_SIZE);
pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
virt = acpi_map(pg_off, pg_sz);
if (!virt) {
mutex_unlock(&acpi_ioremap_lock);
kfree(map);
return NULL;
}
INIT_LIST_HEAD(&map->list);
map->virt = virt;
map->phys = pg_off;
map->size = pg_sz;
map->refcount = 1;
list_add_tail_rcu(&map->list, &acpi_ioremaps);
out:
mutex_unlock(&acpi_ioremap_lock);
return map->virt + (phys - map->phys);
}
EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
return (void *)acpi_os_map_iomem(phys, size);
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);
static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
{
if (!--map->refcount)
list_del_rcu(&map->list);
}
static void acpi_os_map_cleanup(struct acpi_ioremap *map)
{
if (!map->refcount) {
synchronize_rcu_expedited();
acpi_unmap(map->phys, map->virt);
kfree(map);
}
}
/**
* acpi_os_unmap_iomem - Drop a memory mapping reference.
* @virt: Start of the address range to drop a reference to.
* @size: Size of the address range to drop a reference to.
*
* Look up the given virtual address range in the list of existing ACPI memory
* mappings, drop a reference to it and unmap it if there are no more active
* references to it.
*
* During early init (when acpi_permanent_mmap has not been set yet) this
* routine simply calls __acpi_unmap_table() to get the job done. Since
* __acpi_unmap_table() is an __init function, the __ref annotation is needed
* here.
*/
void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
{
struct acpi_ioremap *map;
if (!acpi_permanent_mmap) {
__acpi_unmap_table(virt, size);
return;
}
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup_virt(virt, size);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
WARN(true, PREFIX "%s: bad address %p\n", __func__, virt);
return;
}
acpi_os_drop_map_ref(map);
mutex_unlock(&acpi_ioremap_lock);
acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
{
return acpi_os_unmap_iomem((void __iomem *)virt, size);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
int acpi_os_map_generic_address(struct acpi_generic_address *gas)
{
u64 addr;
void __iomem *virt;
if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
return 0;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !gas->bit_width)
return -EINVAL;
virt = acpi_os_map_iomem(addr, gas->bit_width / 8);
if (!virt)
return -EIO;
return 0;
}
EXPORT_SYMBOL(acpi_os_map_generic_address);
void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
{
u64 addr;
struct acpi_ioremap *map;
if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
return;
/* Handle possible alignment issues */
memcpy(&addr, &gas->address, sizeof(addr));
if (!addr || !gas->bit_width)
return;
mutex_lock(&acpi_ioremap_lock);
map = acpi_map_lookup(addr, gas->bit_width / 8);
if (!map) {
mutex_unlock(&acpi_ioremap_lock);
return;
}
acpi_os_drop_map_ref(map);
mutex_unlock(&acpi_ioremap_lock);
acpi_os_map_cleanup(map);
}
EXPORT_SYMBOL(acpi_os_unmap_generic_address);
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
{
if (!phys || !virt)
return AE_BAD_PARAMETER;
*phys = virt_to_phys(virt);
return AE_OK;
}
#endif
#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
static bool acpi_rev_override;
int __init acpi_rev_override_setup(char *str)
{
acpi_rev_override = true;
return 1;
}
__setup("acpi_rev_override", acpi_rev_override_setup);
#else
#define acpi_rev_override false
#endif
#define ACPI_MAX_OVERRIDE_LEN 100
static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
acpi_status
acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
acpi_string *new_val)
{
if (!init_val || !new_val)
return AE_BAD_PARAMETER;
*new_val = NULL;
if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
printk(KERN_INFO PREFIX "Overriding _OS definition to '%s'\n",
acpi_os_name);
*new_val = acpi_os_name;
}
if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
printk(KERN_INFO PREFIX "Overriding _REV return value to 5\n");
*new_val = (char *)5;
}
return AE_OK;
}
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
u32 handled;
handled = (*acpi_irq_handler) (acpi_irq_context);
if (handled) {
acpi_irq_handled++;
return IRQ_HANDLED;
} else {
acpi_irq_not_handled++;
return IRQ_NONE;
}
}
acpi_status
acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
void *context)
{
unsigned int irq;
acpi_irq_stats_init();
/*
* ACPI interrupts different from the SCI in our copy of the FADT are
* not supported.
*/
if (gsi != acpi_gbl_FADT.sci_interrupt)
return AE_BAD_PARAMETER;
if (acpi_irq_handler)
return AE_ALREADY_ACQUIRED;
if (acpi_gsi_to_irq(gsi, &irq) < 0) {
printk(KERN_ERR PREFIX "SCI (ACPI GSI %d) not registered\n",
gsi);
return AE_OK;
}
acpi_irq_handler = handler;
acpi_irq_context = context;
if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
printk(KERN_ERR PREFIX "SCI (IRQ%d) allocation failed\n", irq);
acpi_irq_handler = NULL;
return AE_NOT_ACQUIRED;
}
acpi_sci_irq = irq;
return AE_OK;
}
acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
{
if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
return AE_BAD_PARAMETER;
free_irq(acpi_sci_irq, acpi_irq);
acpi_irq_handler = NULL;
acpi_sci_irq = INVALID_ACPI_IRQ;
return AE_OK;
}
/*
* Running in interpreter thread context, safe to sleep
*/
void acpi_os_sleep(u64 ms)
{
msleep(ms);
}
void acpi_os_stall(u32 us)
{
while (us) {
u32 delay = 1000;
if (delay > us)
delay = us;
udelay(delay);
touch_nmi_watchdog();
us -= delay;
}
}
/*
* Support ACPI 3.0 AML Timer operand
* Returns 64-bit free-running, monotonically increasing timer
* with 100ns granularity
*/
u64 acpi_os_get_timer(void)
{
u64 time_ns = ktime_to_ns(ktime_get());
do_div(time_ns, 100);
return time_ns;
}
acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width)
{
u32 dummy;
if (!value)
value = &dummy;
*value = 0;
if (width <= 8) {
*(u8 *) value = inb(port);
} else if (width <= 16) {
*(u16 *) value = inw(port);
} else if (width <= 32) {
*(u32 *) value = inl(port);
} else {
BUG();
}
return AE_OK;
}
EXPORT_SYMBOL(acpi_os_read_port);
acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
{
if (width <= 8) {
outb(value, port);
} else if (width <= 16) {
outw(value, port);
} else if (width <= 32) {
outl(value, port);
} else {
BUG();
}
return AE_OK;
}
EXPORT_SYMBOL(acpi_os_write_port);
int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
{
switch (width) {
case 8:
*(u8 *) value = readb(virt_addr);
break;
case 16:
*(u16 *) value = readw(virt_addr);
break;
case 32:
*(u32 *) value = readl(virt_addr);
break;
case 64:
*(u64 *) value = readq(virt_addr);
break;
default:
return -EINVAL;
}
return 0;
}
acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
{
void __iomem *virt_addr;
unsigned int size = width / 8;
bool unmap = false;
u64 dummy;
int error;
rcu_read_lock();
virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
if (!virt_addr) {
rcu_read_unlock();
virt_addr = acpi_os_ioremap(phys_addr, size);
if (!virt_addr)
return AE_BAD_ADDRESS;
unmap = true;
}
if (!value)
value = &dummy;
error = acpi_os_read_iomem(virt_addr, value, width);
BUG_ON(error);
if (unmap)
iounmap(virt_addr);
else
rcu_read_unlock();
return AE_OK;
}
acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
{
void __iomem *virt_addr;
unsigned int size = width / 8;
bool unmap = false;
rcu_read_lock();
virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
if (!virt_addr) {
rcu_read_unlock();
virt_addr = acpi_os_ioremap(phys_addr, size);
if (!virt_addr)
return AE_BAD_ADDRESS;
unmap = true;
}
switch (width) {
case 8:
writeb(value, virt_addr);
break;
case 16:
writew(value, virt_addr);
break;
case 32:
writel(value, virt_addr);
break;
case 64:
writeq(value, virt_addr);
break;
default:
BUG();
}
if (unmap)
iounmap(virt_addr);
else
rcu_read_unlock();
return AE_OK;
}
acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
u64 *value, u32 width)
{
int result, size;
u32 value32;
if (!value)
return AE_BAD_PARAMETER;
switch (width) {
case 8:
size = 1;
break;
case 16:
size = 2;
break;
case 32:
size = 4;
break;
default:
return AE_ERROR;
}
result = raw_pci_read(pci_id->segment, pci_id->bus,
PCI_DEVFN(pci_id->device, pci_id->function),
reg, size, &value32);
*value = value32;
return (result ? AE_ERROR : AE_OK);
}
acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
u64 value, u32 width)
{
int result, size;
switch (width) {
case 8:
size = 1;
break;
case 16:
size = 2;
break;
case 32:
size = 4;
break;
default:
return AE_ERROR;
}
result = raw_pci_write(pci_id->segment, pci_id->bus,
PCI_DEVFN(pci_id->device, pci_id->function),
reg, size, value);
return (result ? AE_ERROR : AE_OK);
}
static void acpi_os_execute_deferred(struct work_struct *work)
{
struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
dpc->function(dpc->context);
kfree(dpc);
}
#ifdef CONFIG_ACPI_DEBUGGER
static struct acpi_debugger acpi_debugger;
static bool acpi_debugger_initialized;
int acpi_register_debugger(struct module *owner,
const struct acpi_debugger_ops *ops)
{
int ret = 0;
mutex_lock(&acpi_debugger.lock);
if (acpi_debugger.ops) {
ret = -EBUSY;
goto err_lock;
}
acpi_debugger.owner = owner;
acpi_debugger.ops = ops;
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
EXPORT_SYMBOL(acpi_register_debugger);
void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
{
mutex_lock(&acpi_debugger.lock);
if (ops == acpi_debugger.ops) {
acpi_debugger.ops = NULL;
acpi_debugger.owner = NULL;
}
mutex_unlock(&acpi_debugger.lock);
}
EXPORT_SYMBOL(acpi_unregister_debugger);
int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
{
int ret;
int (*func)(acpi_osd_exec_callback, void *);
struct module *owner;
if (!acpi_debugger_initialized)
return -ENODEV;
mutex_lock(&acpi_debugger.lock);
if (!acpi_debugger.ops) {
ret = -ENODEV;
goto err_lock;
}
if (!try_module_get(acpi_debugger.owner)) {
ret = -ENODEV;
goto err_lock;
}
func = acpi_debugger.ops->create_thread;
owner = acpi_debugger.owner;
mutex_unlock(&acpi_debugger.lock);
ret = func(function, context);
mutex_lock(&acpi_debugger.lock);
module_put(owner);
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
ssize_t acpi_debugger_write_log(const char *msg)
{
ssize_t ret;
ssize_t (*func)(const char *);
struct module *owner;
if (!acpi_debugger_initialized)
return -ENODEV;
mutex_lock(&acpi_debugger.lock);
if (!acpi_debugger.ops) {
ret = -ENODEV;
goto err_lock;
}
if (!try_module_get(acpi_debugger.owner)) {
ret = -ENODEV;
goto err_lock;
}
func = acpi_debugger.ops->write_log;
owner = acpi_debugger.owner;
mutex_unlock(&acpi_debugger.lock);
ret = func(msg);
mutex_lock(&acpi_debugger.lock);
module_put(owner);
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
{
ssize_t ret;
ssize_t (*func)(char *, size_t);
struct module *owner;
if (!acpi_debugger_initialized)
return -ENODEV;
mutex_lock(&acpi_debugger.lock);
if (!acpi_debugger.ops) {
ret = -ENODEV;
goto err_lock;
}
if (!try_module_get(acpi_debugger.owner)) {
ret = -ENODEV;
goto err_lock;
}
func = acpi_debugger.ops->read_cmd;
owner = acpi_debugger.owner;
mutex_unlock(&acpi_debugger.lock);
ret = func(buffer, buffer_length);
mutex_lock(&acpi_debugger.lock);
module_put(owner);
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
int acpi_debugger_wait_command_ready(void)
{
int ret;
int (*func)(bool, char *, size_t);
struct module *owner;
if (!acpi_debugger_initialized)
return -ENODEV;
mutex_lock(&acpi_debugger.lock);
if (!acpi_debugger.ops) {
ret = -ENODEV;
goto err_lock;
}
if (!try_module_get(acpi_debugger.owner)) {
ret = -ENODEV;
goto err_lock;
}
func = acpi_debugger.ops->wait_command_ready;
owner = acpi_debugger.owner;
mutex_unlock(&acpi_debugger.lock);
ret = func(acpi_gbl_method_executing,
acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
mutex_lock(&acpi_debugger.lock);
module_put(owner);
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
int acpi_debugger_notify_command_complete(void)
{
int ret;
int (*func)(void);
struct module *owner;
if (!acpi_debugger_initialized)
return -ENODEV;
mutex_lock(&acpi_debugger.lock);
if (!acpi_debugger.ops) {
ret = -ENODEV;
goto err_lock;
}
if (!try_module_get(acpi_debugger.owner)) {
ret = -ENODEV;
goto err_lock;
}
func = acpi_debugger.ops->notify_command_complete;
owner = acpi_debugger.owner;
mutex_unlock(&acpi_debugger.lock);
ret = func();
mutex_lock(&acpi_debugger.lock);
module_put(owner);
err_lock:
mutex_unlock(&acpi_debugger.lock);
return ret;
}
int __init acpi_debugger_init(void)
{
mutex_init(&acpi_debugger.lock);
acpi_debugger_initialized = true;
return 0;
}
#endif
/*******************************************************************************
*
* FUNCTION: acpi_os_execute
*
* PARAMETERS: Type - Type of the callback
* Function - Function to be executed
* Context - Function parameters
*
* RETURN: Status
*
* DESCRIPTION: Depending on type, either queues function for deferred execution or
* immediately executes function on a separate thread.
*
******************************************************************************/
acpi_status acpi_os_execute(acpi_execute_type type,
acpi_osd_exec_callback function, void *context)
{
acpi_status status = AE_OK;
struct acpi_os_dpc *dpc;
struct workqueue_struct *queue;
int ret;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Scheduling function [%p(%p)] for deferred execution.\n",
function, context));
if (type == OSL_DEBUGGER_MAIN_THREAD) {
ret = acpi_debugger_create_thread(function, context);
if (ret) {
pr_err("Call to kthread_create() failed.\n");
status = AE_ERROR;
}
goto out_thread;
}
/*
* Allocate/initialize DPC structure. Note that this memory will be
* freed by the callee. The kernel handles the work_struct list in a
* way that allows us to also free its memory inside the callee.
* Because we may want to schedule several tasks with different
* parameters we can't use the approach some kernel code uses of
* having a static work_struct.
*/
dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
if (!dpc)
return AE_NO_MEMORY;
dpc->function = function;
dpc->context = context;
/*
* To prevent lockdep from complaining unnecessarily, make sure that
* there is a different static lockdep key for each workqueue by using
* INIT_WORK() for each of them separately.
*/
if (type == OSL_NOTIFY_HANDLER) {
queue = kacpi_notify_wq;
INIT_WORK(&dpc->work, acpi_os_execute_deferred);
} else if (type == OSL_GPE_HANDLER) {
queue = kacpid_wq;
INIT_WORK(&dpc->work, acpi_os_execute_deferred);
} else {
pr_err("Unsupported os_execute type %d.\n", type);
status = AE_ERROR;
}
if (ACPI_FAILURE(status))
goto err_workqueue;
/*
* On some machines, a software-initiated SMI causes corruption unless
* the SMI runs on CPU 0. An SMI can be initiated by any AML, but
* typically it's done in GPE-related methods that are run via
* workqueues, so we can avoid the known corruption cases by always
* queueing on CPU 0.
*/
ret = queue_work_on(0, queue, &dpc->work);
if (!ret) {
printk(KERN_ERR PREFIX
"Call to queue_work() failed.\n");
status = AE_ERROR;
}
err_workqueue:
if (ACPI_FAILURE(status))
kfree(dpc);
out_thread:
return status;
}
EXPORT_SYMBOL(acpi_os_execute);
void acpi_os_wait_events_complete(void)
{
/*
* Make sure the GPE handler or the fixed event handler is not used
* on another CPU after removal.
*/
if (acpi_sci_irq_valid())
synchronize_hardirq(acpi_sci_irq);
flush_workqueue(kacpid_wq);
flush_workqueue(kacpi_notify_wq);
}
struct acpi_hp_work {
struct work_struct work;
struct acpi_device *adev;
u32 src;
};
static void acpi_hotplug_work_fn(struct work_struct *work)
{
struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
acpi_os_wait_events_complete();
acpi_device_hotplug(hpw->adev, hpw->src);
kfree(hpw);
}
acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
{
struct acpi_hp_work *hpw;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Scheduling hotplug event (%p, %u) for deferred execution.\n",
adev, src));
hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
if (!hpw)
return AE_NO_MEMORY;
INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
hpw->adev = adev;
hpw->src = src;
/*
* We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
* the hotplug code may call driver .remove() functions, which may
* invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
* these workqueues.
*/
if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
kfree(hpw);
return AE_ERROR;
}
return AE_OK;
}
bool acpi_queue_hotplug_work(struct work_struct *work)
{
return queue_work(kacpi_hotplug_wq, work);
}
acpi_status
acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
{
struct semaphore *sem = NULL;
sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
if (!sem)
return AE_NO_MEMORY;
sema_init(sem, initial_units);
*handle = (acpi_handle *) sem;
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
*handle, initial_units));
return AE_OK;
}
/*
* TODO: A better way to delete semaphores? Linux doesn't have a
* 'delete_semaphore()' function -- may result in an invalid
* pointer dereference for non-synchronized consumers. Should
* we at least check for blocked threads and signal/cancel them?
*/
acpi_status acpi_os_delete_semaphore(acpi_handle handle)
{
struct semaphore *sem = (struct semaphore *)handle;
if (!sem)
return AE_BAD_PARAMETER;
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
BUG_ON(!list_empty(&sem->wait_list));
kfree(sem);
sem = NULL;
return AE_OK;
}
/*
* TODO: Support for units > 1?
*/
acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
{
acpi_status status = AE_OK;
struct semaphore *sem = (struct semaphore *)handle;
long jiffies;
int ret = 0;
if (!acpi_os_initialized)
return AE_OK;
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
if (units > 1)
return AE_SUPPORT;
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
handle, units, timeout));
if (timeout == ACPI_WAIT_FOREVER)
jiffies = MAX_SCHEDULE_TIMEOUT;
else
jiffies = msecs_to_jiffies(timeout);
ret = down_timeout(sem, jiffies);
if (ret)
status = AE_TIME;
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"Failed to acquire semaphore[%p|%d|%d], %s",
handle, units, timeout,
acpi_format_exception(status)));
} else {
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
"Acquired semaphore[%p|%d|%d]", handle,
units, timeout));
}
return status;
}
/*
* TODO: Support for units > 1?
*/
acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
{
struct semaphore *sem = (struct semaphore *)handle;
if (!acpi_os_initialized)
return AE_OK;
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
if (units > 1)
return AE_SUPPORT;
ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
units));
up(sem);
return AE_OK;
}
acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
{
#ifdef ENABLE_DEBUGGER
if (acpi_in_debugger) {
u32 chars;
kdb_read(buffer, buffer_length);
/* remove the CR kdb includes */
chars = strlen(buffer) - 1;
buffer[chars] = '\0';
}
#else
int ret;
ret = acpi_debugger_read_cmd(buffer, buffer_length);
if (ret < 0)
return AE_ERROR;
if (bytes_read)
*bytes_read = ret;
#endif
return AE_OK;
}
EXPORT_SYMBOL(acpi_os_get_line);
acpi_status acpi_os_wait_command_ready(void)
{
int ret;
ret = acpi_debugger_wait_command_ready();
if (ret < 0)
return AE_ERROR;
return AE_OK;
}
acpi_status acpi_os_notify_command_complete(void)
{
int ret;
ret = acpi_debugger_notify_command_complete();
if (ret < 0)
return AE_ERROR;
return AE_OK;
}
acpi_status acpi_os_signal(u32 function, void *info)
{
switch (function) {
case ACPI_SIGNAL_FATAL:
printk(KERN_ERR PREFIX "Fatal opcode executed\n");
break;
case ACPI_SIGNAL_BREAKPOINT:
/*
* AML Breakpoint
* ACPI spec. says to treat it as a NOP unless
* you are debugging. So if/when we integrate
* AML debugger into the kernel debugger its
* hook will go here. But until then it is
* not useful to print anything on breakpoints.
*/
break;
default:
break;
}
return AE_OK;
}
static int __init acpi_os_name_setup(char *str)
{
char *p = acpi_os_name;
int count = ACPI_MAX_OVERRIDE_LEN - 1;
if (!str || !*str)
return 0;
for (; count-- && *str; str++) {
if (isalnum(*str) || *str == ' ' || *str == ':')
*p++ = *str;
else if (*str == '\'' || *str == '"')
continue;
else
break;
}
*p = 0;
return 1;
}
__setup("acpi_os_name=", acpi_os_name_setup);
/*
* Disable the auto-serialization of named objects creation methods.
*
* This feature is enabled by default. It marks the AML control methods
* that contain the opcodes to create named objects as "Serialized".
*/
static int __init acpi_no_auto_serialize_setup(char *str)
{
acpi_gbl_auto_serialize_methods = FALSE;
pr_info("ACPI: auto-serialization disabled\n");
return 1;
}
__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
/* Check of resource interference between native drivers and ACPI
* OperationRegions (SystemIO and System Memory only).
* IO ports and memory declared in ACPI might be used by the ACPI subsystem
* in arbitrary AML code and can interfere with legacy drivers.
* acpi_enforce_resources= can be set to:
*
* - strict (default) (2)
* -> further driver trying to access the resources will not load
* - lax (1)
* -> further driver trying to access the resources will load, but you
* get a system message that something might go wrong...
*
* - no (0)
* -> ACPI Operation Region resources will not be registered
*
*/
#define ENFORCE_RESOURCES_STRICT 2
#define ENFORCE_RESOURCES_LAX 1
#define ENFORCE_RESOURCES_NO 0
static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
static int __init acpi_enforce_resources_setup(char *str)
{
if (str == NULL || *str == '\0')
return 0;
if (!strcmp("strict", str))
acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
else if (!strcmp("lax", str))
acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
else if (!strcmp("no", str))
acpi_enforce_resources = ENFORCE_RESOURCES_NO;
return 1;
}
__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
/* Check for resource conflicts between ACPI OperationRegions and native
* drivers */
int acpi_check_resource_conflict(const struct resource *res)
{
acpi_adr_space_type space_id;
acpi_size length;
u8 warn = 0;
int clash = 0;
if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
return 0;
if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
return 0;
if (res->flags & IORESOURCE_IO)
space_id = ACPI_ADR_SPACE_SYSTEM_IO;
else
space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
length = resource_size(res);
if (acpi_enforce_resources != ENFORCE_RESOURCES_NO)
warn = 1;
clash = acpi_check_address_range(space_id, res->start, length, warn);
if (clash) {
if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
printk(KERN_NOTICE "ACPI: This conflict may"
" cause random problems and system"
" instability\n");
printk(KERN_INFO "ACPI: If an ACPI driver is available"
" for this device, you should use it instead of"
" the native driver\n");
}
if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
return -EBUSY;
}
return 0;
}
EXPORT_SYMBOL(acpi_check_resource_conflict);
int acpi_check_region(resource_size_t start, resource_size_t n,
const char *name)
{
struct resource res = {
.start = start,
.end = start + n - 1,
.name = name,
.flags = IORESOURCE_IO,
};
return acpi_check_resource_conflict(&res);
}
EXPORT_SYMBOL(acpi_check_region);
/*
* Let drivers know whether the resource checks are effective
*/
int acpi_resources_are_enforced(void)
{
return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
}
EXPORT_SYMBOL(acpi_resources_are_enforced);
/*
* Deallocate the memory for a spinlock.
*/
void acpi_os_delete_lock(acpi_spinlock handle)
{
ACPI_FREE(handle);
}
/*
* Acquire a spinlock.
*
* handle is a pointer to the spinlock_t.
*/
acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
{
acpi_cpu_flags flags;
spin_lock_irqsave(lockp, flags);
return flags;
}
/*
* Release a spinlock. See above.
*/
void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
{
spin_unlock_irqrestore(lockp, flags);
}
#ifndef ACPI_USE_LOCAL_CACHE
/*******************************************************************************
*
* FUNCTION: acpi_os_create_cache
*
* PARAMETERS: name - Ascii name for the cache
* size - Size of each cached object
* depth - Maximum depth of the cache (in objects) <ignored>
* cache - Where the new cache object is returned
*
* RETURN: status
*
* DESCRIPTION: Create a cache object
*
******************************************************************************/
acpi_status
acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
{
*cache = kmem_cache_create(name, size, 0, 0, NULL);
if (*cache == NULL)
return AE_ERROR;
else
return AE_OK;
}
/*******************************************************************************
*
* FUNCTION: acpi_os_purge_cache
*
* PARAMETERS: Cache - Handle to cache object
*
* RETURN: Status
*
* DESCRIPTION: Free all objects within the requested cache.
*
******************************************************************************/
acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
{
kmem_cache_shrink(cache);
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_os_delete_cache
*
* PARAMETERS: Cache - Handle to cache object
*
* RETURN: Status
*
* DESCRIPTION: Free all objects within the requested cache and delete the
* cache object.
*
******************************************************************************/
acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
{
kmem_cache_destroy(cache);
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_os_release_object
*
* PARAMETERS: Cache - Handle to cache object
* Object - The object to be released
*
* RETURN: None
*
* DESCRIPTION: Release an object to the specified cache. If cache is full,
* the object is deleted.
*
******************************************************************************/
acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
{
kmem_cache_free(cache, object);
return (AE_OK);
}
#endif
static int __init acpi_no_static_ssdt_setup(char *s)
{
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);
static int __init acpi_disable_return_repair(char *s)
{
printk(KERN_NOTICE PREFIX
"ACPI: Predefined validation mechanism disabled\n");
acpi_gbl_disable_auto_repair = TRUE;
return 1;
}
__setup("acpica_no_return_repair", acpi_disable_return_repair);
acpi_status __init acpi_os_initialize(void)
{
acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
/*
* Use acpi_os_map_generic_address to pre-map the reset
* register if it's in system memory.
*/
int rv;
rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
pr_debug(PREFIX "%s: map reset_reg status %d\n", __func__, rv);
}
acpi_os_initialized = true;
return AE_OK;
}
acpi_status __init acpi_os_initialize1(void)
{
kacpid_wq = alloc_workqueue("kacpid", 0, 1);
kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
BUG_ON(!kacpid_wq);
BUG_ON(!kacpi_notify_wq);
BUG_ON(!kacpi_hotplug_wq);
acpi_osi_init();
return AE_OK;
}
acpi_status acpi_os_terminate(void)
{
if (acpi_irq_handler) {
acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
acpi_irq_handler);
}
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
destroy_workqueue(kacpid_wq);
destroy_workqueue(kacpi_notify_wq);
destroy_workqueue(kacpi_hotplug_wq);
return AE_OK;
}
acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
u32 pm1b_control)
{
int rc = 0;
if (__acpi_os_prepare_sleep)
rc = __acpi_os_prepare_sleep(sleep_state,
pm1a_control, pm1b_control);
if (rc < 0)
return AE_ERROR;
else if (rc > 0)
return AE_CTRL_TERMINATE;
return AE_OK;
}
void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
u32 pm1a_ctrl, u32 pm1b_ctrl))
{
__acpi_os_prepare_sleep = func;
}
#if (ACPI_REDUCED_HARDWARE)
acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
u32 val_b)
{
int rc = 0;
if (__acpi_os_prepare_extended_sleep)
rc = __acpi_os_prepare_extended_sleep(sleep_state,
val_a, val_b);
if (rc < 0)
return AE_ERROR;
else if (rc > 0)
return AE_CTRL_TERMINATE;
return AE_OK;
}
#else
acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
u32 val_b)
{
return AE_OK;
}
#endif
void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
u32 val_a, u32 val_b))
{
__acpi_os_prepare_extended_sleep = func;
}
acpi_status acpi_os_enter_sleep(u8 sleep_state,
u32 reg_a_value, u32 reg_b_value)
{
acpi_status status;
if (acpi_gbl_reduced_hardware)
status = acpi_os_prepare_extended_sleep(sleep_state,
reg_a_value,
reg_b_value);
else
status = acpi_os_prepare_sleep(sleep_state,
reg_a_value, reg_b_value);
return status;
}