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Diffstat (limited to 'arch/x86/kernel/apm_32.c')
-rw-r--r--arch/x86/kernel/apm_32.c240
1 files changed, 112 insertions, 128 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 49e0939bac4..58487445141 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -66,7 +66,7 @@
* 1.5: Fix segment register reloading (in case of bad segments saved
* across BIOS call).
* Stephen Rothwell
- * 1.6: Cope with complier/assembler differences.
+ * 1.6: Cope with compiler/assembler differences.
* Only try to turn off the first display device.
* Fix OOPS at power off with no APM BIOS by Jan Echternach
* <echter@informatik.uni-rostock.de>
@@ -140,7 +140,7 @@
* is now the way life works).
* Fix thinko in suspend() (wrong return).
* Notify drivers on critical suspend.
- * Make kapmd absorb more idle time (Pavel Machek <pavel@suse.cz>
+ * Make kapmd absorb more idle time (Pavel Machek <pavel@ucw.cz>
* modified by sfr).
* Disable interrupts while we are suspended (Andy Henroid
* <andy_henroid@yahoo.com> fixed by sfr).
@@ -189,8 +189,8 @@
* Intel Order Number 241704-001. Microsoft Part Number 781-110-X01.
*
* [This document is available free from Intel by calling 800.628.8686 (fax
- * 916.356.6100) or 800.548.4725; or via anonymous ftp from
- * ftp://ftp.intel.com/pub/IAL/software_specs/apmv11.doc. It is also
+ * 916.356.6100) or 800.548.4725; or from
+ * http://www.microsoft.com/whdc/archive/amp_12.mspx It is also
* available from Microsoft by calling 206.882.8080.]
*
* APM 1.2 Reference:
@@ -201,10 +201,11 @@
* http://www.microsoft.com/whdc/archive/amp_12.mspx]
*/
+#define pr_fmt(fmt) "apm: " fmt
+
#include <linux/module.h>
#include <linux/poll.h>
-#include <linux/smp_lock.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/timer.h>
@@ -228,11 +229,13 @@
#include <linux/suspend.h>
#include <linux/kthread.h>
#include <linux/jiffies.h>
+#include <linux/acpi.h>
+#include <linux/syscore_ops.h>
+#include <linux/i8253.h>
+#include <linux/cpuidle.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/desc.h>
-#include <asm/i8253.h>
#include <asm/olpc.h>
#include <asm/paravirt.h>
#include <asm/reboot.h>
@@ -248,8 +251,6 @@ extern int (*console_blank_hook)(int);
#define APM_MINOR_DEV 134
/*
- * See Documentation/Config.help for the configuration options.
- *
* Various options can be changed at boot time as follows:
* (We allow underscores for compatibility with the modules code)
* apm=on/off enable/disable APM
@@ -366,44 +367,74 @@ struct apm_user {
#endif
#define DEFAULT_IDLE_PERIOD (100 / 3)
+static int apm_cpu_idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index);
+
+static struct cpuidle_driver apm_idle_driver = {
+ .name = "apm_idle",
+ .owner = THIS_MODULE,
+ .states = {
+ { /* entry 0 is for polling */ },
+ { /* entry 1 is for APM idle */
+ .name = "APM",
+ .desc = "APM idle",
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .exit_latency = 250, /* WAG */
+ .target_residency = 500, /* WAG */
+ .enter = &apm_cpu_idle
+ },
+ },
+ .state_count = 2,
+};
+
+static struct cpuidle_device apm_cpuidle_device;
+
/*
* Local variables
*/
-static struct {
+__visible struct {
unsigned long offset;
unsigned short segment;
} apm_bios_entry;
static int clock_slowed;
static int idle_threshold __read_mostly = DEFAULT_IDLE_THRESHOLD;
static int idle_period __read_mostly = DEFAULT_IDLE_PERIOD;
-static int set_pm_idle;
static int suspends_pending;
static int standbys_pending;
static int ignore_sys_suspend;
static int ignore_normal_resume;
static int bounce_interval __read_mostly = DEFAULT_BOUNCE_INTERVAL;
-static int debug __read_mostly;
-static int smp __read_mostly;
+static bool debug __read_mostly;
+static bool smp __read_mostly;
static int apm_disabled = -1;
#ifdef CONFIG_SMP
-static int power_off;
+static bool power_off;
#else
-static int power_off = 1;
+static bool power_off = 1;
#endif
-static int realmode_power_off;
+static bool realmode_power_off;
#ifdef CONFIG_APM_ALLOW_INTS
-static int allow_ints = 1;
+static bool allow_ints = 1;
#else
-static int allow_ints;
+static bool allow_ints;
#endif
-static int broken_psr;
+static bool broken_psr;
static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
static struct apm_user *user_list;
static DEFINE_SPINLOCK(user_list_lock);
-static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
+static DEFINE_MUTEX(apm_mutex);
+
+/*
+ * Set up a segment that references the real mode segment 0x40
+ * that extends up to the end of page zero (that we have reserved).
+ * This is for buggy BIOS's that refer to (real mode) segment 0x40
+ * even though they are called in protected mode.
+ */
+static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
+ (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
static const char driver_version[] = "1.16ac"; /* no spaces */
@@ -477,11 +508,11 @@ static void apm_error(char *str, int err)
if (error_table[i].key == err)
break;
if (i < ERROR_COUNT)
- printk(KERN_NOTICE "apm: %s: %s\n", str, error_table[i].msg);
+ pr_notice("%s: %s\n", str, error_table[i].msg);
else if (err < 0)
- printk(KERN_NOTICE "apm: %s: linux error code %i\n", str, err);
+ pr_notice("%s: linux error code %i\n", str, err);
else
- printk(KERN_NOTICE "apm: %s: unknown error code %#2.2x\n",
+ pr_notice("%s: unknown error code %#2.2x\n",
str, err);
}
@@ -810,24 +841,12 @@ static int apm_do_idle(void)
u32 eax;
u8 ret = 0;
int idled = 0;
- int polling;
- int err;
+ int err = 0;
- polling = !!(current_thread_info()->status & TS_POLLING);
- if (polling) {
- current_thread_info()->status &= ~TS_POLLING;
- /*
- * TS_POLLING-cleared state must be visible before we
- * test NEED_RESCHED:
- */
- smp_mb();
- }
if (!need_resched()) {
idled = 1;
ret = apm_bios_call_simple(APM_FUNC_IDLE, 0, 0, &eax, &err);
}
- if (polling)
- current_thread_info()->status |= TS_POLLING;
if (!idled)
return 0;
@@ -874,8 +893,6 @@ static void apm_do_busy(void)
#define IDLE_CALC_LIMIT (HZ * 100)
#define IDLE_LEAKY_MAX 16
-static void (*original_pm_idle)(void) __read_mostly;
-
/**
* apm_cpu_idle - cpu idling for APM capable Linux
*
@@ -884,34 +901,36 @@ static void (*original_pm_idle)(void) __read_mostly;
* Furthermore it calls the system default idle routine.
*/
-static void apm_cpu_idle(void)
+static int apm_cpu_idle(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
{
static int use_apm_idle; /* = 0 */
static unsigned int last_jiffies; /* = 0 */
static unsigned int last_stime; /* = 0 */
+ cputime_t stime;
int apm_idle_done = 0;
unsigned int jiffies_since_last_check = jiffies - last_jiffies;
unsigned int bucket;
recalc:
+ task_cputime(current, NULL, &stime);
if (jiffies_since_last_check > IDLE_CALC_LIMIT) {
use_apm_idle = 0;
- last_jiffies = jiffies;
- last_stime = current->stime;
} else if (jiffies_since_last_check > idle_period) {
unsigned int idle_percentage;
- idle_percentage = current->stime - last_stime;
+ idle_percentage = stime - last_stime;
idle_percentage *= 100;
idle_percentage /= jiffies_since_last_check;
use_apm_idle = (idle_percentage > idle_threshold);
if (apm_info.forbid_idle)
use_apm_idle = 0;
- last_jiffies = jiffies;
- last_stime = current->stime;
}
+ last_jiffies = jiffies;
+ last_stime = stime;
+
bucket = IDLE_LEAKY_MAX;
while (!need_resched()) {
@@ -939,10 +958,7 @@ recalc:
break;
}
}
- if (original_pm_idle)
- original_pm_idle();
- else
- default_idle();
+ default_idle();
local_irq_disable();
jiffies_since_last_check = jiffies - last_jiffies;
if (jiffies_since_last_check > idle_period)
@@ -952,7 +968,7 @@ recalc:
if (apm_idle_done)
apm_do_busy();
- local_irq_enable();
+ return index;
}
/**
@@ -967,20 +983,10 @@ recalc:
static void apm_power_off(void)
{
- unsigned char po_bios_call[] = {
- 0xb8, 0x00, 0x10, /* movw $0x1000,ax */
- 0x8e, 0xd0, /* movw ax,ss */
- 0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
- 0xb8, 0x07, 0x53, /* movw $0x5307,ax */
- 0xbb, 0x01, 0x00, /* movw $0x0001,bx */
- 0xb9, 0x03, 0x00, /* movw $0x0003,cx */
- 0xcd, 0x15 /* int $0x15 */
- };
-
/* Some bioses don't like being called from CPU != 0 */
if (apm_info.realmode_power_off) {
set_cpus_allowed_ptr(current, cpumask_of(0));
- machine_real_restart(po_bios_call, sizeof(po_bios_call));
+ machine_real_restart(MRR_APM);
} else {
(void)set_system_power_state(APM_STATE_OFF);
}
@@ -1185,7 +1191,7 @@ static void queue_event(apm_event_t event, struct apm_user *sender)
static int notified;
if (notified++ == 0)
- printk(KERN_ERR "apm: an event queue overflowed\n");
+ pr_err("an event queue overflowed\n");
if (++as->event_tail >= APM_MAX_EVENTS)
as->event_tail = 0;
}
@@ -1216,15 +1222,15 @@ static void reinit_timer(void)
#ifdef INIT_TIMER_AFTER_SUSPEND
unsigned long flags;
- spin_lock_irqsave(&i8253_lock, flags);
+ raw_spin_lock_irqsave(&i8253_lock, flags);
/* set the clock to HZ */
- outb_pit(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
+ outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */
udelay(10);
- outb_pit(LATCH & 0xff, PIT_CH0); /* LSB */
+ outb_p(LATCH & 0xff, PIT_CH0); /* LSB */
udelay(10);
- outb_pit(LATCH >> 8, PIT_CH0); /* MSB */
+ outb_p(LATCH >> 8, PIT_CH0); /* MSB */
udelay(10);
- spin_unlock_irqrestore(&i8253_lock, flags);
+ raw_spin_unlock_irqrestore(&i8253_lock, flags);
#endif
}
@@ -1233,12 +1239,11 @@ static int suspend(int vetoable)
int err;
struct apm_user *as;
- device_suspend(PMSG_SUSPEND);
-
- device_power_down(PMSG_SUSPEND);
+ dpm_suspend_start(PMSG_SUSPEND);
+ dpm_suspend_end(PMSG_SUSPEND);
local_irq_disable();
- sysdev_suspend(PMSG_SUSPEND);
+ syscore_suspend();
local_irq_enable();
@@ -1256,12 +1261,12 @@ static int suspend(int vetoable)
apm_error("suspend", err);
err = (err == APM_SUCCESS) ? 0 : -EIO;
- sysdev_resume();
+ syscore_resume();
local_irq_enable();
- device_power_up(PMSG_RESUME);
+ dpm_resume_start(PMSG_RESUME);
+ dpm_resume_end(PMSG_RESUME);
- device_resume(PMSG_RESUME);
queue_event(APM_NORMAL_RESUME, NULL);
spin_lock(&user_list_lock);
for (as = user_list; as != NULL; as = as->next) {
@@ -1277,10 +1282,10 @@ static void standby(void)
{
int err;
- device_power_down(PMSG_SUSPEND);
+ dpm_suspend_end(PMSG_SUSPEND);
local_irq_disable();
- sysdev_suspend(PMSG_SUSPEND);
+ syscore_suspend();
local_irq_enable();
err = set_system_power_state(APM_STATE_STANDBY);
@@ -1288,10 +1293,10 @@ static void standby(void)
apm_error("standby", err);
local_irq_disable();
- sysdev_resume();
+ syscore_resume();
local_irq_enable();
- device_power_up(PMSG_RESUME);
+ dpm_resume_start(PMSG_RESUME);
}
static apm_event_t get_event(void)
@@ -1376,7 +1381,7 @@ static void check_events(void)
ignore_bounce = 1;
if ((event != APM_NORMAL_RESUME)
|| (ignore_normal_resume == 0)) {
- device_resume(PMSG_RESUME);
+ dpm_resume_end(PMSG_RESUME);
queue_event(event, NULL);
}
ignore_normal_resume = 0;
@@ -1449,7 +1454,7 @@ static void apm_mainloop(void)
static int check_apm_user(struct apm_user *as, const char *func)
{
if (as == NULL || as->magic != APM_BIOS_MAGIC) {
- printk(KERN_ERR "apm: %s passed bad filp\n", func);
+ pr_err("%s passed bad filp\n", func);
return 1;
}
return 0;
@@ -1523,7 +1528,7 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
return -EPERM;
switch (cmd) {
case APM_IOC_STANDBY:
- lock_kernel();
+ mutex_lock(&apm_mutex);
if (as->standbys_read > 0) {
as->standbys_read--;
as->standbys_pending--;
@@ -1532,10 +1537,10 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
queue_event(APM_USER_STANDBY, as);
if (standbys_pending <= 0)
standby();
- unlock_kernel();
+ mutex_unlock(&apm_mutex);
break;
case APM_IOC_SUSPEND:
- lock_kernel();
+ mutex_lock(&apm_mutex);
if (as->suspends_read > 0) {
as->suspends_read--;
as->suspends_pending--;
@@ -1544,13 +1549,14 @@ static long do_ioctl(struct file *filp, u_int cmd, u_long arg)
queue_event(APM_USER_SUSPEND, as);
if (suspends_pending <= 0) {
ret = suspend(1);
+ mutex_unlock(&apm_mutex);
} else {
as->suspend_wait = 1;
+ mutex_unlock(&apm_mutex);
wait_event_interruptible(apm_suspend_waitqueue,
as->suspend_wait == 0);
ret = as->suspend_result;
}
- unlock_kernel();
return ret;
default:
return -ENOTTY;
@@ -1587,7 +1593,7 @@ static int do_release(struct inode *inode, struct file *filp)
as1 = as1->next)
;
if (as1 == NULL)
- printk(KERN_ERR "apm: filp not in user list\n");
+ pr_err("filp not in user list\n");
else
as1->next = as->next;
}
@@ -1600,14 +1606,10 @@ static int do_open(struct inode *inode, struct file *filp)
{
struct apm_user *as;
- lock_kernel();
as = kmalloc(sizeof(*as), GFP_KERNEL);
- if (as == NULL) {
- printk(KERN_ERR "apm: cannot allocate struct of size %d bytes\n",
- sizeof(*as));
- unlock_kernel();
+ if (as == NULL)
return -ENOMEM;
- }
+
as->magic = APM_BIOS_MAGIC;
as->event_tail = as->event_head = 0;
as->suspends_pending = as->standbys_pending = 0;
@@ -1627,7 +1629,6 @@ static int do_open(struct inode *inode, struct file *filp)
user_list = as;
spin_unlock(&user_list_lock);
filp->private_data = as;
- unlock_kernel();
return 0;
}
@@ -1920,6 +1921,7 @@ static const struct file_operations apm_bios_fops = {
.unlocked_ioctl = do_ioctl,
.open = do_open,
.release = do_release,
+ .llseek = noop_llseek,
};
static struct miscdevice apm_device = {
@@ -1986,8 +1988,8 @@ static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
apm_info.disabled = 1;
printk(KERN_INFO "%s machine detected. "
"Disabling APM.\n", d->ident);
- printk(KERN_INFO "This bug is fixed in bios P15 which is available for \n");
- printk(KERN_INFO "download from support.intel.com \n");
+ printk(KERN_INFO "This bug is fixed in bios P15 which is available for\n");
+ printk(KERN_INFO "download from support.intel.com\n");
}
return 0;
}
@@ -2316,29 +2318,19 @@ static int __init apm_init(void)
}
if (apm_info.disabled) {
- printk(KERN_NOTICE "apm: disabled on user request.\n");
+ pr_notice("disabled on user request.\n");
return -ENODEV;
}
if ((num_online_cpus() > 1) && !power_off && !smp) {
- printk(KERN_NOTICE "apm: disabled - APM is not SMP safe.\n");
+ pr_notice("disabled - APM is not SMP safe.\n");
apm_info.disabled = 1;
return -ENODEV;
}
- if (pm_flags & PM_ACPI) {
- printk(KERN_NOTICE "apm: overridden by ACPI.\n");
+ if (!acpi_disabled) {
+ pr_notice("overridden by ACPI.\n");
apm_info.disabled = 1;
return -ENODEV;
}
- pm_flags |= PM_APM;
-
- /*
- * Set up a segment that references the real mode segment 0x40
- * that extends up to the end of page zero (that we have reserved).
- * This is for buggy BIOS's that refer to (real mode) segment 0x40
- * even though they are called in protected mode.
- */
- set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
- _set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
/*
* Set up the long jump entry point to the APM BIOS, which is called
@@ -2358,19 +2350,18 @@ static int __init apm_init(void)
* code to that CPU.
*/
gdt = get_cpu_gdt_table(0);
- set_base(gdt[APM_CS >> 3],
- __va((unsigned long)apm_info.bios.cseg << 4));
- set_base(gdt[APM_CS_16 >> 3],
- __va((unsigned long)apm_info.bios.cseg_16 << 4));
- set_base(gdt[APM_DS >> 3],
- __va((unsigned long)apm_info.bios.dseg << 4));
+ set_desc_base(&gdt[APM_CS >> 3],
+ (unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
+ set_desc_base(&gdt[APM_CS_16 >> 3],
+ (unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
+ set_desc_base(&gdt[APM_DS >> 3],
+ (unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
proc_create("apm", 0, NULL, &apm_file_ops);
kapmd_task = kthread_create(apm, NULL, "kapmd");
if (IS_ERR(kapmd_task)) {
- printk(KERN_ERR "apm: disabled - Unable to start kernel "
- "thread.\n");
+ pr_err("disabled - Unable to start kernel thread\n");
err = PTR_ERR(kapmd_task);
kapmd_task = NULL;
remove_proc_entry("apm", NULL);
@@ -2395,9 +2386,9 @@ static int __init apm_init(void)
if (HZ != 100)
idle_period = (idle_period * HZ) / 100;
if (idle_threshold < 100) {
- original_pm_idle = pm_idle;
- pm_idle = apm_cpu_idle;
- set_pm_idle = 1;
+ if (!cpuidle_register_driver(&apm_idle_driver))
+ if (cpuidle_register_device(&apm_cpuidle_device))
+ cpuidle_unregister_driver(&apm_idle_driver);
}
return 0;
@@ -2407,15 +2398,9 @@ static void __exit apm_exit(void)
{
int error;
- if (set_pm_idle) {
- pm_idle = original_pm_idle;
- /*
- * We are about to unload the current idle thread pm callback
- * (pm_idle), Wait for all processors to update cached/local
- * copies of pm_idle before proceeding.
- */
- cpu_idle_wait();
- }
+ cpuidle_unregister_device(&apm_cpuidle_device);
+ cpuidle_unregister_driver(&apm_idle_driver);
+
if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
&& (apm_info.connection_version > 0x0100)) {
error = apm_engage_power_management(APM_DEVICE_ALL, 0);
@@ -2430,7 +2415,6 @@ static void __exit apm_exit(void)
kthread_stop(kapmd_task);
kapmd_task = NULL;
}
- pm_flags &= ~PM_APM;
}
module_init(apm_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 19:47:52 +0000