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linux/drivers/acpi/osl.c
Jean Delvare 14f03343ad ACPI: Clarify resource conflict message 
The message "ACPI: Device needs an ACPI driver" is misleading. The
device _may_ need an ACPI driver, if the BIOS implemented a custom
API for the device in question (which, AFAIK, can't be checked.) If
not, then either a generic ACPI driver may be used (for example
"thermal"), or nothing can be done (other than a white list).

I propose to reword the message to:

ACPI: If an ACPI driver is available for this device, you should use
it instead of the native driver

which I think is more correct. Comments and suggestions welcome.

I also added a message warning about possible problems and system
instability when users pass acpi_enforce_resources=lax, as suggested
by Len.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Alan Jenkins <sourcejedi.lkml@googlemail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-09-27 03:12:13 -04:00

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/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.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 <asm/uaccess.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
#define PREFIX "ACPI: "
struct acpi_os_dpc {
acpi_osd_exec_callback function;
void *context;
struct work_struct work;
int wait;
};
#ifdef CONFIG_ACPI_CUSTOM_DSDT
#include CONFIG_ACPI_CUSTOM_DSDT_FILE
#endif
#ifdef ENABLE_DEBUGGER
#include <linux/kdb.h>
/* stuff for debugger support */
int acpi_in_debugger;
EXPORT_SYMBOL(acpi_in_debugger);
extern char line_buf[80];
#endif /*ENABLE_DEBUGGER */
static unsigned int acpi_irq_irq;
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;
struct acpi_res_list {
resource_size_t start;
resource_size_t end;
acpi_adr_space_type resource_type; /* IO port, System memory, ...*/
char name[5]; /* only can have a length of 4 chars, make use of this
one instead of res->name, no need to kalloc then */
struct list_head resource_list;
int count;
};
static LIST_HEAD(resource_list_head);
static DEFINE_SPINLOCK(acpi_res_lock);
#define OSI_STRING_LENGTH_MAX 64 /* arbitrary */
static char osi_additional_string[OSI_STRING_LENGTH_MAX];
/*
* The story of _OSI(Linux)
*
* From pre-history through Linux-2.6.22,
* Linux responded TRUE upon a BIOS OSI(Linux) query.
*
* Unfortunately, reference BIOS writers got wind of this
* and put OSI(Linux) in their example code, quickly exposing
* this string as ill-conceived and opening the door to
* an un-bounded number of BIOS incompatibilities.
*
* For example, OSI(Linux) was used on resume to re-POST a
* video card on one system, because Linux at that time
* could not do a speedy restore in its native driver.
* But then upon gaining quick native restore capability,
* Linux has no way to tell the BIOS to skip the time-consuming
* POST -- putting Linux at a permanent performance disadvantage.
* On another system, the BIOS writer used OSI(Linux)
* to infer native OS support for IPMI! On other systems,
* OSI(Linux) simply got in the way of Linux claiming to
* be compatible with other operating systems, exposing
* BIOS issues such as skipped device initialization.
*
* So "Linux" turned out to be a really poor chose of
* OSI string, and from Linux-2.6.23 onward we respond FALSE.
*
* BIOS writers should NOT query _OSI(Linux) on future systems.
* Linux will complain on the console when it sees it, and return FALSE.
* To get Linux to return TRUE for your system will require
* a kernel source update to add a DMI entry,
* or boot with "acpi_osi=Linux"
*/
static struct osi_linux {
unsigned int enable:1;
unsigned int dmi:1;
unsigned int cmdline:1;
unsigned int known:1;
} osi_linux = { 0, 0, 0, 0};
static void __init acpi_request_region (struct acpi_generic_address *addr,
unsigned int length, char *desc)
{
struct resource *res;
if (!addr->address || !length)
return;
if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
res = request_region(addr->address, length, desc);
else if (addr->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
res = request_mem_region(addr->address, 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;
}
device_initcall(acpi_reserve_resources);
acpi_status __init acpi_os_initialize(void)
{
return AE_OK;
}
static void bind_to_cpu0(struct work_struct *work)
{
set_cpus_allowed_ptr(current, cpumask_of(0));
kfree(work);
}
static void bind_workqueue(struct workqueue_struct *wq)
{
struct work_struct *work;
work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
INIT_WORK(work, bind_to_cpu0);
queue_work(wq, work);
}
acpi_status acpi_os_initialize1(void)
{
/*
* 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 binding
* the workqueues to CPU 0.
*/
kacpid_wq = create_singlethread_workqueue("kacpid");
bind_workqueue(kacpid_wq);
kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
bind_workqueue(kacpi_notify_wq);
kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
bind_workqueue(kacpi_hotplug_wq);
BUG_ON(!kacpid_wq);
BUG_ON(!kacpi_notify_wq);
BUG_ON(!kacpi_hotplug_wq);
return AE_OK;
}
acpi_status acpi_os_terminate(void)
{
if (acpi_irq_handler) {
acpi_os_remove_interrupt_handler(acpi_irq_irq,
acpi_irq_handler);
}
destroy_workqueue(kacpid_wq);
destroy_workqueue(kacpi_notify_wq);
destroy_workqueue(kacpi_hotplug_wq);
return AE_OK;
}
void acpi_os_printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
acpi_os_vprintf(fmt, args);
va_end(args);
}
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 {
printk(KERN_CONT "%s", buffer);
}
#else
printk(KERN_CONT "%s", buffer);
#endif
}
acpi_physical_address __init acpi_os_get_root_pointer(void)
{
if (efi_enabled) {
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
return efi.acpi20;
else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
return efi.acpi;
else {
printk(KERN_ERR PREFIX
"System description tables not found\n");
return 0;
}
} else {
acpi_physical_address pa = 0;
acpi_find_root_pointer(&pa);
return pa;
}
}
void __iomem *__init_refok
acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
{
if (phys > ULONG_MAX) {
printk(KERN_ERR PREFIX "Cannot map memory that high\n");
return NULL;
}
if (acpi_gbl_permanent_mmap)
/*
* ioremap checks to ensure this is in reserved space
*/
return ioremap((unsigned long)phys, size);
else
return __acpi_map_table((unsigned long)phys, size);
}
EXPORT_SYMBOL_GPL(acpi_os_map_memory);
void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
{
if (acpi_gbl_permanent_mmap)
iounmap(virt);
else
__acpi_unmap_table(virt, size);
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
{
if (!acpi_gbl_permanent_mmap)
__acpi_unmap_table(virt, size);
}
#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
#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;
}
return AE_OK;
}
acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,
struct acpi_table_header ** new_table)
{
if (!existing_table || !new_table)
return AE_BAD_PARAMETER;
*new_table = NULL;
#ifdef CONFIG_ACPI_CUSTOM_DSDT
if (strncmp(existing_table->signature, "DSDT", 4) == 0)
*new_table = (struct acpi_table_header *)AmlCode;
#endif
if (*new_table != NULL) {
printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
"this is unsafe: tainting kernel\n",
existing_table->signature,
existing_table->oem_table_id);
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
}
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();
/*
* Ignore the GSI from the core, and use the value in our copy of the
* FADT. It may not be the same if an interrupt source override exists
* for the SCI.
*/
gsi = acpi_gbl_FADT.sci_interrupt;
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);
return AE_NOT_ACQUIRED;
}
acpi_irq_irq = irq;
return AE_OK;
}
acpi_status acpi_os_remove_interrupt_handler(u32 irq, acpi_osd_handler handler)
{
if (irq) {
free_irq(irq, acpi_irq);
acpi_irq_handler = NULL;
acpi_irq_irq = 0;
}
return AE_OK;
}
/*
* Running in interpreter thread context, safe to sleep
*/
void acpi_os_sleep(acpi_integer ms)
{
schedule_timeout_interruptible(msecs_to_jiffies(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)
{
static u64 t;
#ifdef CONFIG_HPET
/* TBD: use HPET if available */
#endif
#ifdef CONFIG_X86_PM_TIMER
/* TBD: default to PM timer if HPET was not available */
#endif
if (!t)
printk(KERN_ERR PREFIX "acpi_os_get_timer() TBD\n");
return ++t;
}
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);
acpi_status
acpi_os_read_memory(acpi_physical_address phys_addr, u32 * value, u32 width)
{
u32 dummy;
void __iomem *virt_addr;
virt_addr = ioremap(phys_addr, width);
if (!value)
value = &dummy;
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;
default:
BUG();
}
iounmap(virt_addr);
return AE_OK;
}
acpi_status
acpi_os_write_memory(acpi_physical_address phys_addr, u32 value, u32 width)
{
void __iomem *virt_addr;
virt_addr = ioremap(phys_addr, width);
switch (width) {
case 8:
writeb(value, virt_addr);
break;
case 16:
writew(value, virt_addr);
break;
case 32:
writel(value, virt_addr);
break;
default:
BUG();
}
iounmap(virt_addr);
return AE_OK;
}
acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
u32 *value, u32 width)
{
int result, size;
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, value);
return (result ? AE_ERROR : AE_OK);
}
acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
acpi_integer 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);
}
/* TODO: Change code to take advantage of driver model more */
static void acpi_os_derive_pci_id_2(acpi_handle rhandle, /* upper bound */
acpi_handle chandle, /* current node */
struct acpi_pci_id **id,
int *is_bridge, u8 * bus_number)
{
acpi_handle handle;
struct acpi_pci_id *pci_id = *id;
acpi_status status;
unsigned long long temp;
acpi_object_type type;
acpi_get_parent(chandle, &handle);
if (handle != rhandle) {
acpi_os_derive_pci_id_2(rhandle, handle, &pci_id, is_bridge,
bus_number);
status = acpi_get_type(handle, &type);
if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
return;
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
&temp);
if (ACPI_SUCCESS(status)) {
u32 val;
pci_id->device = ACPI_HIWORD(ACPI_LODWORD(temp));
pci_id->function = ACPI_LOWORD(ACPI_LODWORD(temp));
if (*is_bridge)
pci_id->bus = *bus_number;
/* any nicer way to get bus number of bridge ? */
status =
acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
8);
if (ACPI_SUCCESS(status)
&& ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
status =
acpi_os_read_pci_configuration(pci_id, 0x18,
&val, 8);
if (!ACPI_SUCCESS(status)) {
/* Certainly broken... FIX ME */
return;
}
*is_bridge = 1;
pci_id->bus = val;
status =
acpi_os_read_pci_configuration(pci_id, 0x19,
&val, 8);
if (ACPI_SUCCESS(status)) {
*bus_number = val;
}
} else
*is_bridge = 0;
}
}
}
void acpi_os_derive_pci_id(acpi_handle rhandle, /* upper bound */
acpi_handle chandle, /* current node */
struct acpi_pci_id **id)
{
int is_bridge = 1;
u8 bus_number = (*id)->bus;
acpi_os_derive_pci_id_2(rhandle, chandle, id, &is_bridge, &bus_number);
}
static void acpi_os_execute_deferred(struct work_struct *work)
{
struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
if (dpc->wait)
acpi_os_wait_events_complete(NULL);
dpc->function(dpc->context);
kfree(dpc);
}
/*******************************************************************************
*
* 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.
*
******************************************************************************/
static acpi_status __acpi_os_execute(acpi_execute_type type,
acpi_osd_exec_callback function, void *context, int hp)
{
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));
/*
* 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 = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
if (!dpc)
return AE_NO_MEMORY;
dpc->function = function;
dpc->context = context;
/*
* We can't run hotplug code in keventd_wq/kacpid_wq/kacpid_notify_wq
* because the hotplug code may call driver .remove() functions,
* which invoke flush_scheduled_work/acpi_os_wait_events_complete
* to flush these workqueues.
*/
queue = hp ? kacpi_hotplug_wq :
(type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq);
dpc->wait = hp ? 1 : 0;
INIT_WORK(&dpc->work, acpi_os_execute_deferred);
ret = queue_work(queue, &dpc->work);
if (!ret) {
printk(KERN_ERR PREFIX
"Call to queue_work() failed.\n");
status = AE_ERROR;
kfree(dpc);
}
return status;
}
acpi_status acpi_os_execute(acpi_execute_type type,
acpi_osd_exec_callback function, void *context)
{
return __acpi_os_execute(type, function, context, 0);
}
EXPORT_SYMBOL(acpi_os_execute);
acpi_status acpi_os_hotplug_execute(acpi_osd_exec_callback function,
void *context)
{
return __acpi_os_execute(0, function, context, 1);
}
void acpi_os_wait_events_complete(void *context)
{
flush_workqueue(kacpid_wq);
flush_workqueue(kacpi_notify_wq);
}
EXPORT_SYMBOL(acpi_os_wait_events_complete);
/*
* Allocate the memory for a spinlock and initialize it.
*/
acpi_status acpi_os_create_lock(acpi_spinlock * handle)
{
spin_lock_init(*handle);
return AE_OK;
}
/*
* Deallocate the memory for a spinlock.
*/
void acpi_os_delete_lock(acpi_spinlock handle)
{
return;
}
acpi_status
acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
{
struct semaphore *sem = NULL;
sem = acpi_os_allocate(sizeof(struct semaphore));
if (!sem)
return AE_NO_MEMORY;
memset(sem, 0, sizeof(struct semaphore));
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 (!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 (!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;
}
#ifdef ACPI_FUTURE_USAGE
u32 acpi_os_get_line(char *buffer)
{
#ifdef ENABLE_DEBUGGER
if (acpi_in_debugger) {
u32 chars;
kdb_read(buffer, sizeof(line_buf));
/* remove the CR kdb includes */
chars = strlen(buffer) - 1;
buffer[chars] = '\0';
}
#endif
return 0;
}
#endif /* ACPI_FUTURE_USAGE */
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; 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);
static void __init set_osi_linux(unsigned int enable)
{
if (osi_linux.enable != enable) {
osi_linux.enable = enable;
printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",
enable ? "Add": "Delet");
}
return;
}
static void __init acpi_cmdline_osi_linux(unsigned int enable)
{
osi_linux.cmdline = 1; /* cmdline set the default */
set_osi_linux(enable);
return;
}
void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)
{
osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */
printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
if (enable == -1)
return;
osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */
set_osi_linux(enable);
return;
}
/*
* Modify the list of "OS Interfaces" reported to BIOS via _OSI
*
* empty string disables _OSI
* string starting with '!' disables that string
* otherwise string is added to list, augmenting built-in strings
*/
int __init acpi_osi_setup(char *str)
{
if (str == NULL || *str == '\0') {
printk(KERN_INFO PREFIX "_OSI method disabled\n");
acpi_gbl_create_osi_method = FALSE;
} else if (!strcmp("!Linux", str)) {
acpi_cmdline_osi_linux(0); /* !enable */
} else if (*str == '!') {
if (acpi_osi_invalidate(++str) == AE_OK)
printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);
} else if (!strcmp("Linux", str)) {
acpi_cmdline_osi_linux(1); /* enable */
} else if (*osi_additional_string == '\0') {
strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX);
printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);
}
return 1;
}
__setup("acpi_osi=", acpi_osi_setup);
/* enable serialization to combat AE_ALREADY_EXISTS errors */
static int __init acpi_serialize_setup(char *str)
{
printk(KERN_INFO PREFIX "serialize enabled\n");
acpi_gbl_all_methods_serialized = TRUE;
return 1;
}
__setup("acpi_serialize", acpi_serialize_setup);
/*
* Wake and Run-Time GPES are expected to be separate.
* We disable wake-GPEs at run-time to prevent spurious
* interrupts.
*
* However, if a system exists that shares Wake and
* Run-time events on the same GPE this flag is available
* to tell Linux to keep the wake-time GPEs enabled at run-time.
*/
static int __init acpi_wake_gpes_always_on_setup(char *str)
{
printk(KERN_INFO PREFIX "wake GPEs not disabled\n");
acpi_gbl_leave_wake_gpes_disabled = FALSE;
return 1;
}
__setup("acpi_wake_gpes_always_on", acpi_wake_gpes_always_on_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(struct resource *res)
{
struct acpi_res_list *res_list_elem;
int ioport;
int clash = 0;
if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
return 0;
if (!(res->flags & IORESOURCE_IO) && !(res->flags & IORESOURCE_MEM))
return 0;
ioport = res->flags & IORESOURCE_IO;
spin_lock(&acpi_res_lock);
list_for_each_entry(res_list_elem, &resource_list_head,
resource_list) {
if (ioport && (res_list_elem->resource_type
!= ACPI_ADR_SPACE_SYSTEM_IO))
continue;
if (!ioport && (res_list_elem->resource_type
!= ACPI_ADR_SPACE_SYSTEM_MEMORY))
continue;
if (res->end < res_list_elem->start
|| res_list_elem->end < res->start)
continue;
clash = 1;
break;
}
spin_unlock(&acpi_res_lock);
if (clash) {
if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
printk("%sACPI: %s resource %s [0x%llx-0x%llx]"
" conflicts with ACPI region %s"
" [0x%llx-0x%llx]\n",
acpi_enforce_resources == ENFORCE_RESOURCES_LAX
? KERN_WARNING : KERN_ERR,
ioport ? "I/O" : "Memory", res->name,
(long long) res->start, (long long) res->end,
res_list_elem->name,
(long long) res_list_elem->start,
(long long) res_list_elem->end);
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);
int acpi_check_mem_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_MEM,
};
return acpi_check_resource_conflict(&res);
}
EXPORT_SYMBOL(acpi_check_mem_region);
/*
* 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);
}
/******************************************************************************
*
* FUNCTION: acpi_os_validate_interface
*
* PARAMETERS: interface - Requested interface to be validated
*
* RETURN: AE_OK if interface is supported, AE_SUPPORT otherwise
*
* DESCRIPTION: Match an interface string to the interfaces supported by the
* host. Strings originate from an AML call to the _OSI method.
*
*****************************************************************************/
acpi_status
acpi_os_validate_interface (char *interface)
{
if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX))
return AE_OK;
if (!strcmp("Linux", interface)) {
printk(KERN_NOTICE PREFIX
"BIOS _OSI(Linux) query %s%s\n",
osi_linux.enable ? "honored" : "ignored",
osi_linux.cmdline ? " via cmdline" :
osi_linux.dmi ? " via DMI" : "");
if (osi_linux.enable)
return AE_OK;
}
return AE_SUPPORT;
}
static inline int acpi_res_list_add(struct acpi_res_list *res)
{
struct acpi_res_list *res_list_elem;
list_for_each_entry(res_list_elem, &resource_list_head,
resource_list) {
if (res->resource_type == res_list_elem->resource_type &&
res->start == res_list_elem->start &&
res->end == res_list_elem->end) {
/*
* The Region(addr,len) already exist in the list,
* just increase the count
*/
res_list_elem->count++;
return 0;
}
}
res->count = 1;
list_add(&res->resource_list, &resource_list_head);
return 1;
}
static inline void acpi_res_list_del(struct acpi_res_list *res)
{
struct acpi_res_list *res_list_elem;
list_for_each_entry(res_list_elem, &resource_list_head,
resource_list) {
if (res->resource_type == res_list_elem->resource_type &&
res->start == res_list_elem->start &&
res->end == res_list_elem->end) {
/*
* If the res count is decreased to 0,
* remove and free it
*/
if (--res_list_elem->count == 0) {
list_del(&res_list_elem->resource_list);
kfree(res_list_elem);
}
return;
}
}
}
acpi_status
acpi_os_invalidate_address(
u8 space_id,
acpi_physical_address address,
acpi_size length)
{
struct acpi_res_list res;
switch (space_id) {
case ACPI_ADR_SPACE_SYSTEM_IO:
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
/* Only interference checks against SystemIO and SytemMemory
are needed */
res.start = address;
res.end = address + length - 1;
res.resource_type = space_id;
spin_lock(&acpi_res_lock);
acpi_res_list_del(&res);
spin_unlock(&acpi_res_lock);
break;
case ACPI_ADR_SPACE_PCI_CONFIG:
case ACPI_ADR_SPACE_EC:
case ACPI_ADR_SPACE_SMBUS:
case ACPI_ADR_SPACE_CMOS:
case ACPI_ADR_SPACE_PCI_BAR_TARGET:
case ACPI_ADR_SPACE_DATA_TABLE:
case ACPI_ADR_SPACE_FIXED_HARDWARE:
break;
}
return AE_OK;
}
/******************************************************************************
*
* FUNCTION: acpi_os_validate_address
*
* PARAMETERS: space_id - ACPI space ID
* address - Physical address
* length - Address length
*
* RETURN: AE_OK if address/length is valid for the space_id. Otherwise,
* should return AE_AML_ILLEGAL_ADDRESS.
*
* DESCRIPTION: Validate a system address via the host OS. Used to validate
* the addresses accessed by AML operation regions.
*
*****************************************************************************/
acpi_status
acpi_os_validate_address (
u8 space_id,
acpi_physical_address address,
acpi_size length,
char *name)
{
struct acpi_res_list *res;
int added;
if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
return AE_OK;
switch (space_id) {
case ACPI_ADR_SPACE_SYSTEM_IO:
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
/* Only interference checks against SystemIO and SytemMemory
are needed */
res = kzalloc(sizeof(struct acpi_res_list), GFP_KERNEL);
if (!res)
return AE_OK;
/* ACPI names are fixed to 4 bytes, still better use strlcpy */
strlcpy(res->name, name, 5);
res->start = address;
res->end = address + length - 1;
res->resource_type = space_id;
spin_lock(&acpi_res_lock);
added = acpi_res_list_add(res);
spin_unlock(&acpi_res_lock);
pr_debug("%s %s resource: start: 0x%llx, end: 0x%llx, "
"name: %s\n", added ? "Added" : "Already exist",
(space_id == ACPI_ADR_SPACE_SYSTEM_IO)
? "SystemIO" : "System Memory",
(unsigned long long)res->start,
(unsigned long long)res->end,
res->name);
if (!added)
kfree(res);
break;
case ACPI_ADR_SPACE_PCI_CONFIG:
case ACPI_ADR_SPACE_EC:
case ACPI_ADR_SPACE_SMBUS:
case ACPI_ADR_SPACE_CMOS:
case ACPI_ADR_SPACE_PCI_BAR_TARGET:
case ACPI_ADR_SPACE_DATA_TABLE:
case ACPI_ADR_SPACE_FIXED_HARDWARE:
break;
}
return AE_OK;
}
#endif
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