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linux/drivers/acpi/osl.c

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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>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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/dmi.h>
#include <linux/workqueue.h>
#include <linux/nmi.h>
#include <linux/acpi.h>
#include <acpi/acpi.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/processor.h>
#include <asm/uaccess.h>
#include <linux/efi.h>
#include <linux/ioport.h>
#include <linux/list.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;
};
#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;
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;
};
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];
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
static int acpi_no_initrd_override;
#endif
/*
* "Ode to _OSI(Linux)"
*
* osi_linux -- Control response to BIOS _OSI(Linux) query.
*
* As Linux evolves, the features that it supports change.
* So an OSI string such as "Linux" is not specific enough
* to be useful across multiple versions of Linux. It
* doesn't identify any particular feature, interface,
* or even any particular version of Linux...
*
* Unfortunately, Linux-2.6.22 and earlier responded "yes"
* to a BIOS _OSI(Linux) query. When
* a reference mobile BIOS started using it, its use
* started to spread to many vendor platforms.
* As it is not supportable, we need to halt that spread.
*
* Today, most BIOS references to _OSI(Linux) are noise --
* they have no functional effect and are just dead code
* carried over from the reference BIOS.
*
* The next most common case is that _OSI(Linux) harms Linux,
* usually by causing the BIOS to follow paths that are
* not tested during Windows validation.
*
* Finally, there is a short list of platforms
* where OSI(Linux) benefits Linux.
*
* In Linux-2.6.23, OSI(Linux) is first disabled by default.
* DMI is used to disable the dmesg warning about OSI(Linux)
* on platforms where it is known to have no effect.
* But a dmesg warning remains for systems where
* we do not know if OSI(Linux) is good or bad for the system.
* DMI is also used to enable OSI(Linux) for the machines
* that are known to need it.
*
* BIOS writers should NOT query _OSI(Linux) on future systems.
* It will be ignored by default, and to get Linux to
* not ignore it will require a kernel source update to
* add a DMI entry, or a boot-time "acpi_osi=Linux" invocation.
*/
#define OSI_LINUX_ENABLE 0
static struct osi_linux {
unsigned int enable:1;
unsigned int dmi:1;
unsigned int cmdline:1;
unsigned int known:1;
} osi_linux = { OSI_LINUX_ENABLE, 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;
}
acpi_status acpi_os_initialize1(void)
{
/*
* Initialize PCI configuration space access, as we'll need to access
* it while walking the namespace (bus 0 and root bridges w/ _BBNs).
*/
if (!raw_pci_ops) {
printk(KERN_ERR PREFIX
"Access to PCI configuration space unavailable\n");
return AE_NULL_ENTRY;
}
kacpid_wq = create_singlethread_workqueue("kacpid");
kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
BUG_ON(!kacpid_wq);
BUG_ON(!kacpi_notify_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);
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("%s", buffer);
}
#else
printk("%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 acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
{
if (acpi_gbl_permanent_mmap) {
iounmap(virt);
}
}
EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
#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;
}
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
struct acpi_table_header *acpi_find_dsdt_initrd(void)
{
struct file *firmware_file;
mm_segment_t oldfs;
unsigned long len, len2;
struct acpi_table_header *dsdt_buffer, *ret = NULL;
struct kstat stat;
char *ramfs_dsdt_name = "/DSDT.aml";
printk(KERN_INFO PREFIX "Checking initramfs for custom DSDT");
/*
* Never do this at home, only the user-space is allowed to open a file.
* The clean way would be to use the firmware loader.
* But this code must be run before there is any userspace available.
* A static/init firmware infrastructure doesn't exist yet...
*/
if (vfs_stat(ramfs_dsdt_name, &stat) < 0)
return ret;
len = stat.size;
/* check especially against empty files */
if (len <= 4) {
printk(KERN_ERR PREFIX "Failed: DSDT only %lu bytes.\n", len);
return ret;
}
firmware_file = filp_open(ramfs_dsdt_name, O_RDONLY, 0);
if (IS_ERR(firmware_file)) {
printk(KERN_ERR PREFIX "Failed to open %s.\n", ramfs_dsdt_name);
return ret;
}
dsdt_buffer = kmalloc(len, GFP_ATOMIC);
if (!dsdt_buffer) {
printk(KERN_ERR PREFIX "Failed to allocate %lu bytes.\n", len);
goto err;
}
oldfs = get_fs();
set_fs(KERNEL_DS);
len2 = vfs_read(firmware_file, (char __user *)dsdt_buffer, len,
&firmware_file->f_pos);
set_fs(oldfs);
if (len2 < len) {
printk(KERN_ERR PREFIX "Failed to read %lu bytes from %s.\n",
len, ramfs_dsdt_name);
ACPI_FREE(dsdt_buffer);
goto err;
}
printk(KERN_INFO PREFIX "Found %lu byte DSDT in %s.\n",
len, ramfs_dsdt_name);
ret = dsdt_buffer;
err:
filp_close(firmware_file, NULL);
return ret;
}
#endif
acpi_status
acpi_os_table_override(struct acpi_table_header * existing_table,
struct acpi_table_header ** new_table)
{
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
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
if ((strncmp(existing_table->signature, "DSDT", 4) == 0) &&
!acpi_no_initrd_override) {
struct acpi_table_header *initrd_table;
initrd_table = acpi_find_dsdt_initrd();
if (initrd_table)
*new_table = initrd_table;
}
#endif
if (*new_table != NULL) {
printk(KERN_WARNING PREFIX "Override [%4.4s-%8.8s], "
"this is unsafe: tainting kernel\n",
existing_table->signature,
existing_table->oem_table_id);
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
}
return AE_OK;
}
#ifdef CONFIG_ACPI_CUSTOM_DSDT_INITRD
int __init acpi_no_initrd_override_setup(char *s)
{
acpi_no_initrd_override = 1;
return 1;
}
__setup("acpi_no_initrd_override", acpi_no_initrd_override_setup);
#endif
static irqreturn_t acpi_irq(int irq, void *dev_id)
{
u32 handled;
handled = (*acpi_irq_handler) (acpi_irq_context);
if (handled) {
acpi_irq_handled++;
return IRQ_HANDLED;
} else
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,
void *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;
}
BUG_ON(!raw_pci_ops);
result = raw_pci_ops->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;
}
BUG_ON(!raw_pci_ops);
result = raw_pci_ops->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 temp;
acpi_object_type type;
u8 tu8;
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)) {
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, &tu8,
8);
if (ACPI_SUCCESS(status)
&& ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
status =
acpi_os_read_pci_configuration(pci_id, 0x18,
&tu8, 8);
if (!ACPI_SUCCESS(status)) {
/* Certainly broken... FIX ME */
return;
}
*is_bridge = 1;
pci_id->bus = tu8;
status =
acpi_os_read_pci_configuration(pci_id, 0x19,
&tu8, 8);
if (ACPI_SUCCESS(status)) {
*bus_number = tu8;
}
} 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) {
printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
return;
}
dpc->function(dpc->context);
kfree(dpc);
return;
}
/*******************************************************************************
*
* 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;
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"Scheduling function [%p(%p)] for deferred execution.\n",
function, context));
if (!function)
return AE_BAD_PARAMETER;
/*
* 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_ACPI_STATUS(AE_NO_MEMORY);
dpc->function = function;
dpc->context = context;
INIT_WORK(&dpc->work, acpi_os_execute_deferred);
queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq;
if (!queue_work(queue, &dpc->work)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Call to queue_work() failed.\n"));
status = AE_ERROR;
kfree(dpc);
}
return_ACPI_STATUS(status);
}
EXPORT_SYMBOL(acpi_os_execute);
void acpi_os_wait_events_complete(void *context)
{
flush_workqueue(kacpid_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));
kfree(sem);
sem = NULL;
return AE_OK;
}
/*
* TODO: The kernel doesn't have a 'down_timeout' function -- had to
* improvise. The process is to sleep for one scheduler quantum
* until the semaphore becomes available. Downside is that this
* may result in starvation for timeout-based waits when there's
* lots of semaphore activity.
*
* 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;
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));
/*
* This can be called during resume with interrupts off.
* Like boot-time, we should be single threaded and will
* always get the lock if we try -- timeout or not.
* If this doesn't succeed, then we will oops courtesy of
* might_sleep() in down().
*/
if (!down_trylock(sem))
return AE_OK;
switch (timeout) {
/*
* No Wait:
* --------
* A zero timeout value indicates that we shouldn't wait - just
* acquire the semaphore if available otherwise return AE_TIME
* (a.k.a. 'would block').
*/
case 0:
if (down_trylock(sem))
status = AE_TIME;
break;
/*
* Wait Indefinitely:
* ------------------
*/
case ACPI_WAIT_FOREVER:
down(sem);
break;
/*
* Wait w/ Timeout:
* ----------------
*/
default:
// TODO: A better timeout algorithm?
{
int i = 0;
static const int quantum_ms = 1000 / HZ;
ret = down_trylock(sem);
for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
schedule_timeout_interruptible(1);
ret = down_trylock(sem);
}
if (ret != 0)
status = AE_TIME;
}
break;
}
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
*/
static 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 (2)
* -> further driver trying to access the resources will not load
* - lax (default) (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_LAX;
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(KERN_INFO "%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);
printk(KERN_INFO "ACPI: Device needs an ACPI 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);
}
/**
* acpi_dmi_dump - dump DMI slots needed for blacklist entry
*
* Returns 0 on success
*/
static int acpi_dmi_dump(void)
{
if (!dmi_available)
return -1;
printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n",
dmi_get_system_info(DMI_SYS_VENDOR));
printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n",
dmi_get_system_info(DMI_PRODUCT_NAME));
printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n",
dmi_get_system_info(DMI_PRODUCT_VERSION));
printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n",
dmi_get_system_info(DMI_BOARD_NAME));
printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n",
dmi_get_system_info(DMI_BIOS_VENDOR));
printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n",
dmi_get_system_info(DMI_BIOS_DATE));
return 0;
}
/******************************************************************************
*
* 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.dmi) {
if (acpi_dmi_dump())
printk(KERN_NOTICE PREFIX
"[please extract dmidecode output]\n");
printk(KERN_NOTICE PREFIX
"Please send DMI info above to "
"linux-acpi@vger.kernel.org\n");
}
if (!osi_linux.known && !osi_linux.cmdline) {
printk(KERN_NOTICE PREFIX
"If \"acpi_osi=%sLinux\" works better, "
"please notify linux-acpi@vger.kernel.org\n",
osi_linux.enable ? "!" : "");
}
if (osi_linux.enable)
return AE_OK;
}
return AE_SUPPORT;
}
/******************************************************************************
*
* 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;
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);
list_add(&res->resource_list, &resource_list_head);
spin_unlock(&acpi_res_lock);
pr_debug("Added %s resource: start: 0x%llx, end: 0x%llx, "
"name: %s\n", (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
? "SystemIO" : "System Memory",
(unsigned long long)res->start,
(unsigned long long)res->end,
res->name);
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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