* 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>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
#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>
+#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");
static char osi_additional_string[OSI_STRING_LENGTH_MAX];
/*
- * "Ode to _OSI(Linux)"
+ * The story of _OSI(Linux)
*
- * osi_linux -- Control response to BIOS _OSI(Linux) query.
+ * From pre-history through Linux-2.6.22,
+ * Linux responded TRUE upon a 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, 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.
*
- * 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.
+ * 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.
*
- * 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.
+ * 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.
- * 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.
+ * 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"
*/
-#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};
+} osi_linux = { 0, 0, 0, 0};
static void __init acpi_request_region (struct acpi_generic_address *addr,
unsigned int length, char *desc)
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);
va_end(args);
}
-EXPORT_SYMBOL(acpi_os_printf);
-
void acpi_os_vprintf(const char *fmt, va_list args)
{
static char buffer[512];
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;
- else
- *new_table = NULL;
-#else
- *new_table = NULL;
#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;
}
schedule_timeout_interruptible(msecs_to_jiffies(ms));
}
-EXPORT_SYMBOL(acpi_os_sleep);
-
void acpi_os_stall(u32 us)
{
while (us) {
}
}
-EXPORT_SYMBOL(acpi_os_stall);
-
/*
* Support ACPI 3.0 AML Timer operand
* Returns 64-bit free-running, monotonically increasing timer
acpi_status
acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
- void *value, u32 width)
+ u32 *value, u32 width)
{
int result, size;
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);
+ 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);
}
-EXPORT_SYMBOL(acpi_os_read_pci_configuration);
-
acpi_status
acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
acpi_integer value, u32 width)
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);
+ 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);
}
acpi_handle handle;
struct acpi_pci_id *pci_id = *id;
acpi_status status;
- unsigned long temp;
+ unsigned long long temp;
acpi_object_type type;
- u8 tu8;
acpi_get_parent(chandle, &handle);
if (handle != rhandle) {
if ((ACPI_FAILURE(status)) || (type != ACPI_TYPE_DEVICE))
return;
- status =
- acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL,
+ 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));
/* any nicer way to get bus number of bridge ? */
status =
- acpi_os_read_pci_configuration(pci_id, 0x0e, &tu8,
+ acpi_os_read_pci_configuration(pci_id, 0x0e, &val,
8);
if (ACPI_SUCCESS(status)
- && ((tu8 & 0x7f) == 1 || (tu8 & 0x7f) == 2)) {
+ && ((val & 0x7f) == 1 || (val & 0x7f) == 2)) {
status =
acpi_os_read_pci_configuration(pci_id, 0x18,
- &tu8, 8);
+ &val, 8);
if (!ACPI_SUCCESS(status)) {
/* Certainly broken... FIX ME */
return;
}
*is_bridge = 1;
- pci_id->bus = tu8;
+ pci_id->bus = val;
status =
acpi_os_read_pci_configuration(pci_id, 0x19,
- &tu8, 8);
+ &val, 8);
if (ACPI_SUCCESS(status)) {
- *bus_number = tu8;
+ *bus_number = val;
}
} else
*is_bridge = 0;
return;
}
+static void acpi_os_execute_hp_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;
+ }
+
+ acpi_os_wait_events_complete(NULL);
+
+ dpc->function(dpc->context);
+ kfree(dpc);
+
+ return;
+}
+
/*******************************************************************************
*
* FUNCTION: acpi_os_execute
*
******************************************************************************/
-acpi_status acpi_os_execute(acpi_execute_type type,
- acpi_osd_exec_callback function, void *context)
+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));
dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
if (!dpc)
- return_ACPI_STATUS(AE_NO_MEMORY);
+ return 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"));
+ if (!hp) {
+ INIT_WORK(&dpc->work, acpi_os_execute_deferred);
+ queue = (type == OSL_NOTIFY_HANDLER) ?
+ kacpi_notify_wq : kacpid_wq;
+ ret = queue_work(queue, &dpc->work);
+ } else {
+ INIT_WORK(&dpc->work, acpi_os_execute_hp_deferred);
+ ret = schedule_work(&dpc->work);
+ }
+
+ if (!ret) {
+ printk(KERN_ERR PREFIX
+ "Call to queue_work() failed.\n");
status = AE_ERROR;
kfree(dpc);
}
- return_ACPI_STATUS(status);
+ 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);
{
struct semaphore *sem = NULL;
-
sem = acpi_os_allocate(sizeof(struct semaphore));
if (!sem)
return AE_NO_MEMORY;
return AE_OK;
}
-EXPORT_SYMBOL(acpi_os_create_semaphore);
-
/*
* TODO: A better way to delete semaphores? Linux doesn't have a
* 'delete_semaphore()' function -- may result in an invalid
{
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;
}
-EXPORT_SYMBOL(acpi_os_delete_semaphore);
-
/*
- * 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;
+ long jiffies;
int ret = 0;
-
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
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 (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,
return status;
}
-EXPORT_SYMBOL(acpi_os_wait_semaphore);
-
/*
* TODO: Support for units > 1?
*/
{
struct semaphore *sem = (struct semaphore *)handle;
-
if (!sem || (units < 1))
return AE_BAD_PARAMETER;
return AE_OK;
}
-EXPORT_SYMBOL(acpi_os_signal_semaphore);
-
#ifdef ACPI_FUTURE_USAGE
u32 acpi_os_get_line(char *buffer)
{
return AE_OK;
}
-EXPORT_SYMBOL(acpi_os_signal);
-
static int __init acpi_os_name_setup(char *str)
{
char *p = acpi_os_name;
* string starting with '!' disables that string
* otherwise string is added to list, augmenting built-in strings
*/
-static int __init acpi_osi_setup(char *str)
+int __init acpi_osi_setup(char *str)
{
if (str == NULL || *str == '\0') {
printk(KERN_INFO PREFIX "_OSI method disabled\n");
if (clash) {
if (acpi_enforce_resources != ENFORCE_RESOURCES_NO) {
- printk(KERN_INFO "%sACPI: %s resource %s [0x%llx-0x%llx]"
+ 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
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
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;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff