@@ -1809,17 +1809,6 @@ config APM_DO_ENABLE
T400CDT. This is off by default since most machines do fine without
this feature.
-config APM_CPU_IDLE
- bool "Make CPU Idle calls when idle"
- ---help---
- Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
- On some machines, this can activate improved power savings, such as
- a slowed CPU clock rate, when the machine is idle. These idle calls
- are made after the idle loop has run for some length of time (e.g.,
- 333 mS). On some machines, this will cause a hang at boot time or
- whenever the CPU becomes idle. (On machines with more than one CPU,
- this option does nothing.)
-
config APM_DISPLAY_BLANK
bool "Enable console blanking using APM"
---help---
@@ -175,8 +175,6 @@
* Ignore first resume after we generate our own resume event
* after a suspend (Thomas Hood)
* Daemonize now gets rid of our controlling terminal (sfr).
- * CONFIG_APM_CPU_IDLE now just affects the default value of
- * idle_threshold (sfr).
* Change name of kernel apm daemon (as it no longer idles) (sfr).
* 1.16ac: Fix up SMP support somewhat. You can now force SMP on and we
* make _all_ APM calls on the CPU#0. Fix unsafe sign bug.
@@ -261,12 +259,6 @@ extern int (*console_blank_hook)(int);
* [no-]smp Use apm even on an SMP box
* bounce[-_]interval=<n> number of ticks to ignore suspend
* bounces
- * idle[-_]threshold=<n> System idle percentage above which to
- * make APM BIOS idle calls. Set it to
- * 100 to disable.
- * idle[-_]period=<n> Period (in 1/100s of a second) over
- * which the idle percentage is
- * calculated.
*/
/* KNOWN PROBLEM MACHINES:
@@ -356,26 +348,12 @@ struct apm_user {
#define APM_BIOS_MAGIC 0x4101
/*
- * idle percentage above which bios idle calls are done
- */
-#ifdef CONFIG_APM_CPU_IDLE
-#define DEFAULT_IDLE_THRESHOLD 95
-#else
-#define DEFAULT_IDLE_THRESHOLD 100
-#endif
-#define DEFAULT_IDLE_PERIOD (100 / 3)
-
-/*
* Local variables
*/
static 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;
@@ -805,165 +783,6 @@ static int set_system_power_state(u_short state)
}
/**
- * apm_do_idle - perform power saving
- *
- * This function notifies the BIOS that the processor is (in the view
- * of the OS) idle. It returns -1 in the event that the BIOS refuses
- * to handle the idle request. On a success the function returns 1
- * if the BIOS did clock slowing or 0 otherwise.
- */
-
-static int apm_do_idle(void)
-{
- u32 eax;
- u8 ret = 0;
- int idled = 0;
- int polling;
- 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;
-
- if (ret) {
- static unsigned long t;
-
- /* This always fails on some SMP boards running UP kernels.
- * Only report the failure the first 5 times.
- */
- if (++t < 5) {
- printk(KERN_DEBUG "apm_do_idle failed (%d)\n", err);
- t = jiffies;
- }
- return -1;
- }
- clock_slowed = (apm_info.bios.flags & APM_IDLE_SLOWS_CLOCK) != 0;
- return clock_slowed;
-}
-
-/**
- * apm_do_busy - inform the BIOS the CPU is busy
- *
- * Request that the BIOS brings the CPU back to full performance.
- */
-
-static void apm_do_busy(void)
-{
- u32 dummy;
- int err;
-
- if (clock_slowed || ALWAYS_CALL_BUSY) {
- (void)apm_bios_call_simple(APM_FUNC_BUSY, 0, 0, &dummy, &err);
- clock_slowed = 0;
- }
-}
-
-/*
- * If no process has really been interested in
- * the CPU for some time, we want to call BIOS
- * power management - we probably want
- * to conserve power.
- */
-#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
- *
- * This is the idling function the kernel executes when APM is available. It
- * tries to do BIOS powermanagement based on the average system idle time.
- * Furthermore it calls the system default idle routine.
- */
-
-static void apm_cpu_idle(void)
-{
- static int use_apm_idle; /* = 0 */
- static unsigned int last_jiffies; /* = 0 */
- static unsigned int last_stime; /* = 0 */
-
- int apm_idle_done = 0;
- unsigned int jiffies_since_last_check = jiffies - last_jiffies;
- unsigned int bucket;
-
-recalc:
- 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 *= 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;
- }
-
- bucket = IDLE_LEAKY_MAX;
-
- while (!need_resched()) {
- if (use_apm_idle) {
- unsigned int t;
-
- t = jiffies;
- switch (apm_do_idle()) {
- case 0:
- apm_idle_done = 1;
- if (t != jiffies) {
- if (bucket) {
- bucket = IDLE_LEAKY_MAX;
- continue;
- }
- } else if (bucket) {
- bucket--;
- continue;
- }
- break;
- case 1:
- apm_idle_done = 1;
- break;
- default: /* BIOS refused */
- break;
- }
- }
- if (original_pm_idle)
- original_pm_idle();
- else
- default_idle();
- local_irq_disable();
- jiffies_since_last_check = jiffies - last_jiffies;
- if (jiffies_since_last_check > idle_period)
- goto recalc;
- }
-
- if (apm_idle_done)
- apm_do_busy();
-
- local_irq_enable();
-}
-
-/**
* apm_power_off - ask the BIOS to power off
*
* Handle the power off sequence. This is the one piece of code we
@@ -1881,12 +1700,6 @@ static int __init apm_setup(char *str)
if ((strncmp(str, "bounce-interval=", 16) == 0) ||
(strncmp(str, "bounce_interval=", 16) == 0))
bounce_interval = simple_strtol(str + 16, NULL, 0);
- if ((strncmp(str, "idle-threshold=", 15) == 0) ||
- (strncmp(str, "idle_threshold=", 15) == 0))
- idle_threshold = simple_strtol(str + 15, NULL, 0);
- if ((strncmp(str, "idle-period=", 12) == 0) ||
- (strncmp(str, "idle_period=", 12) == 0))
- idle_period = simple_strtol(str + 12, NULL, 0);
invert = (strncmp(str, "no-", 3) == 0) ||
(strncmp(str, "no_", 3) == 0);
if (invert)
@@ -1898,7 +1711,6 @@ static int __init apm_setup(char *str)
power_off = !invert;
if (strncmp(str, "smp", 3) == 0) {
smp = !invert;
- idle_threshold = 100;
}
if ((strncmp(str, "allow-ints", 10) == 0) ||
(strncmp(str, "allow_ints", 10) == 0))
@@ -1999,17 +1811,6 @@ static int __init apm_is_horked_d850md(const struct dmi_system_id *d)
return 0;
}
-/* Some APM bioses hang on APM idle calls */
-static int __init apm_likes_to_melt(const struct dmi_system_id *d)
-{
- if (apm_info.forbid_idle == 0) {
- apm_info.forbid_idle = 1;
- printk(KERN_INFO "%s machine detected. "
- "Disabling APM idle calls.\n", d->ident);
- }
- return 0;
-}
-
/*
* Check for clue free BIOS implementations who use
* the following QA technique
@@ -2150,16 +1951,6 @@ static struct dmi_system_id __initdata apm_dmi_table[] = {
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
DMI_MATCH(DMI_BIOS_VERSION, "A11"), },
},
- { /* APM idle hangs */
- apm_likes_to_melt, "Jabil AMD",
- { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
- DMI_MATCH(DMI_BIOS_VERSION, "0AASNP06"), },
- },
- { /* APM idle hangs */
- apm_likes_to_melt, "AMI Bios",
- { DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
- DMI_MATCH(DMI_BIOS_VERSION, "0AASNP05"), },
- },
{ /* Handle problems with APM on Sony Vaio PCG-N505X(DE) */
swab_apm_power_in_minutes, "Sony VAIO",
{ DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
@@ -2390,14 +2181,6 @@ static int __init apm_init(void)
if (misc_register(&apm_device))
printk(KERN_WARNING "apm: Could not register misc device.\n");
- 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;
- }
-
return 0;
}
@@ -2405,15 +2188,6 @@ 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();
- }
if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0)
&& (apm_info.connection_version > 0x0100)) {
error = apm_engage_power_management(APM_DEVICE_ALL, 0);
@@ -2451,12 +2225,6 @@ MODULE_PARM_DESC(broken_psr, "BIOS has a broken GetPowerStatus call");
module_param(realmode_power_off, bool, 0444);
MODULE_PARM_DESC(realmode_power_off,
"Switch to real mode before powering off");
-module_param(idle_threshold, int, 0444);
-MODULE_PARM_DESC(idle_threshold,
- "System idle percentage above which to make APM BIOS idle calls");
-module_param(idle_period, int, 0444);
-MODULE_PARM_DESC(idle_period,
- "Period (in sec/100) over which to caculate the idle percentage");
module_param(smp, bool, 0444);
MODULE_PARM_DESC(smp,
"Set this to enable APM use on an SMP platform. Use with caution on older systems");