*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
+ * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
* - Added processor hotplug support
+ * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ * - Added support for C3 on SMP
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/moduleparam.h>
+#include <linux/sched.h> /* need_resched() */
+#include <linux/latency.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#define ACPI_PROCESSOR_CLASS "processor"
#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME ("acpi_processor")
-
+ACPI_MODULE_NAME("acpi_processor")
#define ACPI_PROCESSOR_FILE_POWER "power"
-
#define US_TO_PM_TIMER_TICKS(t) ((t * (PM_TIMER_FREQUENCY/1000)) / 1000)
#define C2_OVERHEAD 4 /* 1us (3.579 ticks per us) */
#define C3_OVERHEAD 4 /* 1us (3.579 ticks per us) */
-
-static void (*pm_idle_save)(void);
+static void (*pm_idle_save) (void) __read_mostly;
module_param(max_cstate, uint, 0644);
-static unsigned int nocst = 0;
+static unsigned int nocst __read_mostly;
module_param(nocst, uint, 0000);
/*
* 100 HZ: 0x0000000F: 4 jiffies = 40ms
* reduce history for more aggressive entry into C3
*/
-static unsigned int bm_history = (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
+static unsigned int bm_history __read_mostly =
+ (HZ >= 800 ? 0xFFFFFFFF : ((1U << (HZ / 25)) - 1));
module_param(bm_history, uint, 0644);
/* --------------------------------------------------------------------------
Power Management
*
* To skip this limit, boot/load with a large max_cstate limit.
*/
-static int no_c2c3(struct dmi_system_id *id)
+static int set_max_cstate(struct dmi_system_id *id)
{
if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
return 0;
- printk(KERN_NOTICE PREFIX "%s detected - C2,C3 disabled."
- " Override with \"processor.max_cstate=%d\"\n", id->ident,
- ACPI_PROCESSOR_MAX_POWER + 1);
+ printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
+ " Override with \"processor.max_cstate=%d\"\n", id->ident,
+ (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
- max_cstate = 1;
+ max_cstate = (long)id->driver_data;
return 0;
}
-
-
-
-static struct dmi_system_id __initdata processor_power_dmi_table[] = {
- { no_c2c3, "IBM ThinkPad R40e", {
+/* Actually this shouldn't be __cpuinitdata, would be better to fix the
+ callers to only run once -AK */
+static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET43WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET45WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET47WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET50WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET52WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET55WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET56WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET59WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET61WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET62WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET64WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET65WW") }, (void*)1},
+ { set_max_cstate, "IBM ThinkPad R40e", {
DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
- DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }},
- { no_c2c3, "Medion 41700", {
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET68WW") }, (void*)1},
+ { set_max_cstate, "Medion 41700", {
DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
- DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J") }},
+ DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J")}, (void *)1},
+ { set_max_cstate, "Clevo 5600D", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+ DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
+ (void *)2},
{},
};
-
-static inline u32
-ticks_elapsed (
- u32 t1,
- u32 t2)
+static inline u32 ticks_elapsed(u32 t1, u32 t2)
{
if (t2 >= t1)
return (t2 - t1);
return ((0xFFFFFFFF - t1) + t2);
}
-
static void
-acpi_processor_power_activate (
- struct acpi_processor *pr,
- struct acpi_processor_cx *new)
+acpi_processor_power_activate(struct acpi_processor *pr,
+ struct acpi_processor_cx *new)
{
- struct acpi_processor_cx *old;
+ struct acpi_processor_cx *old;
if (!pr || !new)
return;
if (old)
old->promotion.count = 0;
- new->demotion.count = 0;
+ new->demotion.count = 0;
/* Cleanup from old state. */
if (old) {
switch (old->type) {
case ACPI_STATE_C3:
/* Disable bus master reload */
- if (new->type != ACPI_STATE_C3)
- acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK);
+ if (new->type != ACPI_STATE_C3 && pr->flags.bm_check)
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0,
+ ACPI_MTX_DO_NOT_LOCK);
break;
}
}
switch (new->type) {
case ACPI_STATE_C3:
/* Enable bus master reload */
- if (old->type != ACPI_STATE_C3)
- acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK);
+ if (old->type != ACPI_STATE_C3 && pr->flags.bm_check)
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1,
+ ACPI_MTX_DO_NOT_LOCK);
break;
}
return;
}
+static void acpi_safe_halt(void)
+{
+ current_thread_info()->status &= ~TS_POLLING;
+ /*
+ * TS_POLLING-cleared state must be visible before we
+ * test NEED_RESCHED:
+ */
+ smp_mb();
+ if (!need_resched())
+ safe_halt();
+ current_thread_info()->status |= TS_POLLING;
+}
+
+static atomic_t c3_cpu_count;
+
+/* Common C-state entry for C2, C3, .. */
+static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
+{
+ if (cstate->space_id == ACPI_CSTATE_FFH) {
+ /* Call into architectural FFH based C-state */
+ acpi_processor_ffh_cstate_enter(cstate);
+ } else {
+ int unused;
+ /* IO port based C-state */
+ inb(cstate->address);
+ /* Dummy wait op - must do something useless after P_LVL2 read
+ because chipsets cannot guarantee that STPCLK# signal
+ gets asserted in time to freeze execution properly. */
+ unused = inl(acpi_fadt.xpm_tmr_blk.address);
+ }
+}
-static void acpi_processor_idle (void)
+static void acpi_processor_idle(void)
{
- struct acpi_processor *pr = NULL;
+ struct acpi_processor *pr = NULL;
struct acpi_processor_cx *cx = NULL;
struct acpi_processor_cx *next_state = NULL;
- int sleep_ticks = 0;
- u32 t1, t2 = 0;
+ int sleep_ticks = 0;
+ u32 t1, t2 = 0;
- pr = processors[_smp_processor_id()];
+ pr = processors[smp_processor_id()];
if (!pr)
return;
}
cx = pr->power.state;
- if (!cx)
- goto easy_out;
+ if (!cx) {
+ if (pm_idle_save)
+ pm_idle_save();
+ else
+ acpi_safe_halt();
+ return;
+ }
/*
* Check BM Activity
* for demotion.
*/
if (pr->flags.bm_check) {
- u32 bm_status = 0;
- unsigned long diff = jiffies - pr->power.bm_check_timestamp;
+ u32 bm_status = 0;
+ unsigned long diff = jiffies - pr->power.bm_check_timestamp;
- if (diff > 32)
- diff = 32;
+ if (diff > 31)
+ diff = 31;
- while (diff) {
- /* if we didn't get called, assume there was busmaster activity */
- diff--;
- if (diff)
- pr->power.bm_activity |= 0x1;
- pr->power.bm_activity <<= 1;
- }
+ pr->power.bm_activity <<= diff;
acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS,
- &bm_status, ACPI_MTX_DO_NOT_LOCK);
+ &bm_status, ACPI_MTX_DO_NOT_LOCK);
if (bm_status) {
- pr->power.bm_activity++;
+ pr->power.bm_activity |= 0x1;
acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS,
- 1, ACPI_MTX_DO_NOT_LOCK);
+ 1, ACPI_MTX_DO_NOT_LOCK);
}
/*
* PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
*/
else if (errata.piix4.bmisx) {
if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
- || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
- pr->power.bm_activity++;
+ || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
+ pr->power.bm_activity |= 0x1;
}
pr->power.bm_check_timestamp = jiffies;
/*
- * Apply bus mastering demotion policy. Automatically demote
+ * If bus mastering is or was active this jiffy, demote
* to avoid a faulty transition. Note that the processor
* won't enter a low-power state during this call (to this
- * funciton) but should upon the next.
+ * function) but should upon the next.
*
* TBD: A better policy might be to fallback to the demotion
* state (use it for this quantum only) istead of
* qualification. This may, however, introduce DMA
* issues (e.g. floppy DMA transfer overrun/underrun).
*/
- if (pr->power.bm_activity & cx->demotion.threshold.bm) {
+ if ((pr->power.bm_activity & 0x1) &&
+ cx->demotion.threshold.bm) {
local_irq_enable();
next_state = cx->demotion.state;
goto end;
}
}
- cx->usage++;
+#ifdef CONFIG_HOTPLUG_CPU
+ /*
+ * Check for P_LVL2_UP flag before entering C2 and above on
+ * an SMP system. We do it here instead of doing it at _CST/P_LVL
+ * detection phase, to work cleanly with logical CPU hotplug.
+ */
+ if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
+ !pr->flags.has_cst && !acpi_fadt.plvl2_up)
+ cx = &pr->power.states[ACPI_STATE_C1];
+#endif
/*
* Sleep:
* ------
* Invoke the current Cx state to put the processor to sleep.
*/
+ if (cx->type == ACPI_STATE_C2 || cx->type == ACPI_STATE_C3) {
+ current_thread_info()->status &= ~TS_POLLING;
+ /*
+ * TS_POLLING-cleared state must be visible before we
+ * test NEED_RESCHED:
+ */
+ smp_mb();
+ if (need_resched()) {
+ current_thread_info()->status |= TS_POLLING;
+ local_irq_enable();
+ return;
+ }
+ }
+
switch (cx->type) {
case ACPI_STATE_C1:
if (pm_idle_save)
pm_idle_save();
else
- safe_halt();
+ acpi_safe_halt();
+
/*
- * TBD: Can't get time duration while in C1, as resumes
+ * TBD: Can't get time duration while in C1, as resumes
* go to an ISR rather than here. Need to instrument
* base interrupt handler.
*/
/* Get start time (ticks) */
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C2 */
- inb(cx->address);
- /* Dummy op - must do something useless after P_LVL2 read */
- t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ acpi_cstate_enter(cx);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+
+#ifdef CONFIG_GENERIC_TIME
+ /* TSC halts in C2, so notify users */
+ mark_tsc_unstable();
+#endif
/* Re-enable interrupts */
local_irq_enable();
+ current_thread_info()->status |= TS_POLLING;
/* Compute time (ticks) that we were actually asleep */
- sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD;
+ sleep_ticks =
+ ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD;
break;
case ACPI_STATE_C3:
- /* Disable bus master arbitration */
- acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK);
+
+ if (pr->flags.bm_check) {
+ if (atomic_inc_return(&c3_cpu_count) ==
+ num_online_cpus()) {
+ /*
+ * All CPUs are trying to go to C3
+ * Disable bus master arbitration
+ */
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1,
+ ACPI_MTX_DO_NOT_LOCK);
+ }
+ } else {
+ /* SMP with no shared cache... Invalidate cache */
+ ACPI_FLUSH_CPU_CACHE();
+ }
+
/* Get start time (ticks) */
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C3 */
- inb(cx->address);
- /* Dummy op - must do something useless after P_LVL3 read */
- t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ acpi_cstate_enter(cx);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
- /* Enable bus master arbitration */
- acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK);
+ if (pr->flags.bm_check) {
+ /* Enable bus master arbitration */
+ atomic_dec(&c3_cpu_count);
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0,
+ ACPI_MTX_DO_NOT_LOCK);
+ }
+
+#ifdef CONFIG_GENERIC_TIME
+ /* TSC halts in C3, so notify users */
+ mark_tsc_unstable();
+#endif
/* Re-enable interrupts */
local_irq_enable();
+ current_thread_info()->status |= TS_POLLING;
/* Compute time (ticks) that we were actually asleep */
- sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD;
+ sleep_ticks =
+ ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD;
break;
default:
local_irq_enable();
return;
}
+ cx->usage++;
+ if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
+ cx->time += sleep_ticks;
next_state = pr->power.state;
+#ifdef CONFIG_HOTPLUG_CPU
+ /* Don't do promotion/demotion */
+ if ((cx->type == ACPI_STATE_C1) && (num_online_cpus() > 1) &&
+ !pr->flags.has_cst && !acpi_fadt.plvl2_up) {
+ next_state = cx;
+ goto end;
+ }
+#endif
+
/*
* Promotion?
* ----------
*/
if (cx->promotion.state &&
((cx->promotion.state - pr->power.states) <= max_cstate)) {
- if (sleep_ticks > cx->promotion.threshold.ticks) {
+ if (sleep_ticks > cx->promotion.threshold.ticks &&
+ cx->promotion.state->latency <= system_latency_constraint()) {
cx->promotion.count++;
- cx->demotion.count = 0;
- if (cx->promotion.count >= cx->promotion.threshold.count) {
+ cx->demotion.count = 0;
+ if (cx->promotion.count >=
+ cx->promotion.threshold.count) {
if (pr->flags.bm_check) {
- if (!(pr->power.bm_activity & cx->promotion.threshold.bm)) {
- next_state = cx->promotion.state;
+ if (!
+ (pr->power.bm_activity & cx->
+ promotion.threshold.bm)) {
+ next_state =
+ cx->promotion.state;
goto end;
}
- }
- else {
+ } else {
next_state = cx->promotion.state;
goto end;
}
}
}
-end:
+ end:
/*
* Demote if current state exceeds max_cstate
+ * or if the latency of the current state is unacceptable
*/
- if ((pr->power.state - pr->power.states) > max_cstate) {
+ if ((pr->power.state - pr->power.states) > max_cstate ||
+ pr->power.state->latency > system_latency_constraint()) {
if (cx->demotion.state)
next_state = cx->demotion.state;
}
*/
if (next_state != pr->power.state)
acpi_processor_power_activate(pr, next_state);
-
- return;
-
- easy_out:
- /* do C1 instead of busy loop */
- if (pm_idle_save)
- pm_idle_save();
- else
- safe_halt();
- return;
}
-
-static int
-acpi_processor_set_power_policy (
- struct acpi_processor *pr)
+static int acpi_processor_set_power_policy(struct acpi_processor *pr)
{
unsigned int i;
unsigned int state_is_set = 0;
struct acpi_processor_cx *higher = NULL;
struct acpi_processor_cx *cx;
- ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
/*
* This function sets the default Cx state policy (OS idle handler).
*/
/* startup state */
- for (i=1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
+ for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
cx = &pr->power.states[i];
if (!cx->valid)
continue;
pr->power.state = cx;
state_is_set++;
break;
- }
+ }
if (!state_is_set)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* demotion */
- for (i=1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
+ for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
cx = &pr->power.states[i];
if (!cx->valid)
continue;
continue;
if (higher) {
- cx->promotion.state = higher;
+ cx->promotion.state = higher;
cx->promotion.threshold.ticks = cx->latency_ticks;
if (cx->type >= ACPI_STATE_C2)
cx->promotion.threshold.count = 4;
higher = cx;
}
- return_VALUE(0);
+ return 0;
}
-
-static int acpi_processor_get_power_info_fadt (struct acpi_processor *pr)
+static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
{
- int i;
-
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (!pr->pblk)
- return_VALUE(-ENODEV);
-
- for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
- memset(pr->power.states, 0, sizeof(struct acpi_processor_cx));
+ return -ENODEV;
/* if info is obtained from pblk/fadt, type equals state */
- pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
- /* the C0 state only exists as a filler in our array,
- * and all processors need to support C1 */
- pr->power.states[ACPI_STATE_C0].valid = 1;
- pr->power.states[ACPI_STATE_C1].valid = 1;
+#ifndef CONFIG_HOTPLUG_CPU
+ /*
+ * Check for P_LVL2_UP flag before entering C2 and above on
+ * an SMP system.
+ */
+ if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up)
+ return -ENODEV;
+#endif
/* determine C2 and C3 address from pblk */
pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
pr->power.states[ACPI_STATE_C2].address,
pr->power.states[ACPI_STATE_C3].address));
- return_VALUE(0);
+ return 0;
}
-
-static int acpi_processor_get_power_info_cst (struct acpi_processor *pr)
+static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
{
- acpi_status status = 0;
- acpi_integer count;
- int i;
- struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
- union acpi_object *cst;
+ if (!pr->power.states[ACPI_STATE_C1].valid) {
+ /* set the first C-State to C1 */
+ /* all processors need to support C1 */
+ pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
+ pr->power.states[ACPI_STATE_C1].valid = 1;
+ }
+ /* the C0 state only exists as a filler in our array */
+ pr->power.states[ACPI_STATE_C0].valid = 1;
+ return 0;
+}
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst");
+static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
+{
+ acpi_status status = 0;
+ acpi_integer count;
+ int current_count;
+ int i;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *cst;
- if (errata.smp)
- return_VALUE(-ENODEV);
if (nocst)
- return_VALUE(-ENODEV);
+ return -ENODEV;
- pr->power.count = 0;
- for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
- memset(pr->power.states, 0, sizeof(struct acpi_processor_cx));
+ current_count = 0;
status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
- return_VALUE(-ENODEV);
- }
+ return -ENODEV;
+ }
- cst = (union acpi_object *) buffer.pointer;
+ cst = buffer.pointer;
/* There must be at least 2 elements */
if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "not enough elements in _CST\n"));
+ printk(KERN_ERR PREFIX "not enough elements in _CST\n");
status = -EFAULT;
goto end;
}
/* Validate number of power states. */
if (count < 1 || count != cst->package.count - 1) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "count given by _CST is not valid\n"));
+ printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
status = -EFAULT;
goto end;
}
- /* We support up to ACPI_PROCESSOR_MAX_POWER. */
- if (count > ACPI_PROCESSOR_MAX_POWER) {
- printk(KERN_WARNING "Limiting number of power states to max (%d)\n", ACPI_PROCESSOR_MAX_POWER);
- printk(KERN_WARNING "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
- count = ACPI_PROCESSOR_MAX_POWER;
- }
-
/* Tell driver that at least _CST is supported. */
pr->flags.has_cst = 1;
memset(&cx, 0, sizeof(cx));
- element = (union acpi_object *) &(cst->package.elements[i]);
+ element = &(cst->package.elements[i]);
if (element->type != ACPI_TYPE_PACKAGE)
continue;
if (element->package.count != 4)
continue;
- obj = (union acpi_object *) &(element->package.elements[0]);
+ obj = &(element->package.elements[0]);
if (obj->type != ACPI_TYPE_BUFFER)
continue;
- reg = (struct acpi_power_register *) obj->buffer.pointer;
+ reg = (struct acpi_power_register *)obj->buffer.pointer;
if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
- (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
+ (reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
continue;
- cx.address = (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) ?
- 0 : reg->address;
-
/* There should be an easy way to extract an integer... */
- obj = (union acpi_object *) &(element->package.elements[1]);
+ obj = &(element->package.elements[1]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
cx.type = obj->integer.value;
+ /*
+ * Some buggy BIOSes won't list C1 in _CST -
+ * Let acpi_processor_get_power_info_default() handle them later
+ */
+ if (i == 1 && cx.type != ACPI_STATE_C1)
+ current_count++;
+
+ cx.address = reg->address;
+ cx.index = current_count + 1;
+
+ cx.space_id = ACPI_CSTATE_SYSTEMIO;
+ if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
+ if (acpi_processor_ffh_cstate_probe
+ (pr->id, &cx, reg) == 0) {
+ cx.space_id = ACPI_CSTATE_FFH;
+ } else if (cx.type != ACPI_STATE_C1) {
+ /*
+ * C1 is a special case where FIXED_HARDWARE
+ * can be handled in non-MWAIT way as well.
+ * In that case, save this _CST entry info.
+ * That is, we retain space_id of SYSTEM_IO for
+ * halt based C1.
+ * Otherwise, ignore this info and continue.
+ */
+ continue;
+ }
+ }
- if ((cx.type != ACPI_STATE_C1) &&
- (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO))
- continue;
-
- if ((cx.type < ACPI_STATE_C1) ||
- (cx.type > ACPI_STATE_C3))
- continue;
-
- obj = (union acpi_object *) &(element->package.elements[2]);
+ obj = &(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
cx.latency = obj->integer.value;
- obj = (union acpi_object *) &(element->package.elements[3]);
+ obj = &(element->package.elements[3]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
cx.power = obj->integer.value;
- (pr->power.count)++;
- memcpy(&(pr->power.states[pr->power.count]), &cx, sizeof(cx));
+ current_count++;
+ memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
+
+ /*
+ * We support total ACPI_PROCESSOR_MAX_POWER - 1
+ * (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
+ */
+ if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
+ printk(KERN_WARNING
+ "Limiting number of power states to max (%d)\n",
+ ACPI_PROCESSOR_MAX_POWER);
+ printk(KERN_WARNING
+ "Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
+ break;
+ }
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n", pr->power.count));
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
+ current_count));
/* Validate number of power states discovered */
- if (pr->power.count < 2)
- status = -ENODEV;
+ if (current_count < 2)
+ status = -EFAULT;
-end:
- acpi_os_free(buffer.pointer);
+ end:
+ kfree(buffer.pointer);
- return_VALUE(status);
+ return status;
}
-
static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2");
if (!cx->address)
- return_VOID;
+ return;
/*
* C2 latency must be less than or equal to 100
*/
else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "latency too large [%d]\n",
- cx->latency));
- return_VOID;
- }
-
- /* We're (currently) only supporting C2 on UP */
- else if (errata.smp) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C2 not supported in SMP mode\n"));
- return_VOID;
+ "latency too large [%d]\n", cx->latency));
+ return;
}
/*
cx->valid = 1;
cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
- return_VOID;
+ return;
}
-
-static void acpi_processor_power_verify_c3(
- struct acpi_processor *pr,
- struct acpi_processor_cx *cx)
+static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
+ struct acpi_processor_cx *cx)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3");
+ static int bm_check_flag;
+
if (!cx->address)
- return_VOID;
+ return;
/*
* C3 latency must be less than or equal to 1000
*/
else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "latency too large [%d]\n",
- cx->latency));
- return_VOID;
- }
-
- /* bus mastering control is necessary */
- else if (!pr->flags.bm_control) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 support requires bus mastering control\n"));
- return_VOID;
- }
-
- /* We're (currently) only supporting C2 on UP */
- else if (errata.smp) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 not supported in SMP mode\n"));
- return_VOID;
+ "latency too large [%d]\n", cx->latency));
+ return;
}
/*
*/
else if (errata.piix4.fdma) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 not supported on PIIX4 with Type-F DMA\n"));
- return_VOID;
+ "C3 not supported on PIIX4 with Type-F DMA\n"));
+ return;
+ }
+
+ /* All the logic here assumes flags.bm_check is same across all CPUs */
+ if (!bm_check_flag) {
+ /* Determine whether bm_check is needed based on CPU */
+ acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
+ bm_check_flag = pr->flags.bm_check;
+ } else {
+ pr->flags.bm_check = bm_check_flag;
+ }
+
+ if (pr->flags.bm_check) {
+ /* bus mastering control is necessary */
+ if (!pr->flags.bm_control) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 support requires bus mastering control\n"));
+ return;
+ }
+ } else {
+ /*
+ * WBINVD should be set in fadt, for C3 state to be
+ * supported on when bm_check is not required.
+ */
+ if (acpi_fadt.wb_invd != 1) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Cache invalidation should work properly"
+ " for C3 to be enabled on SMP systems\n"));
+ return;
+ }
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD,
+ 0, ACPI_MTX_DO_NOT_LOCK);
}
/*
*/
cx->valid = 1;
cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
- pr->flags.bm_check = 1;
- return_VOID;
+ return;
}
-
static int acpi_processor_power_verify(struct acpi_processor *pr)
{
unsigned int i;
unsigned int working = 0;
- for (i=1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+ int timer_broadcast = 0;
+ cpumask_t mask = cpumask_of_cpu(pr->id);
+ on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
+#endif
+
+ for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
struct acpi_processor_cx *cx = &pr->power.states[i];
switch (cx->type) {
case ACPI_STATE_C2:
acpi_processor_power_verify_c2(cx);
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+ /* Some AMD systems fake C3 as C2, but still
+ have timer troubles */
+ if (cx->valid &&
+ boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ timer_broadcast++;
+#endif
break;
case ACPI_STATE_C3:
acpi_processor_power_verify_c3(pr, cx);
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+ if (cx->valid)
+ timer_broadcast++;
+#endif
break;
}
working++;
}
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+ if (timer_broadcast)
+ on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1);
+#endif
+
return (working);
}
-static int acpi_processor_get_power_info (
- struct acpi_processor *pr)
+static int acpi_processor_get_power_info(struct acpi_processor *pr)
{
unsigned int i;
int result;
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info");
/* NOTE: the idle thread may not be running while calling
* this function */
+ /* Zero initialize all the C-states info. */
+ memset(pr->power.states, 0, sizeof(pr->power.states));
+
result = acpi_processor_get_power_info_cst(pr);
- if ((result) || (acpi_processor_power_verify(pr) < 2)) {
+ if (result == -ENODEV)
result = acpi_processor_get_power_info_fadt(pr);
- if (result)
- return_VALUE(result);
- if (acpi_processor_power_verify(pr) < 2)
- return_VALUE(-ENODEV);
- }
+ if (result)
+ return result;
+
+ acpi_processor_get_power_info_default(pr);
+
+ pr->power.count = acpi_processor_power_verify(pr);
/*
* Set Default Policy
*/
result = acpi_processor_set_power_policy(pr);
if (result)
- return_VALUE(result);
+ return result;
/*
* if one state of type C2 or C3 is available, mark this
* CPU as being "idle manageable"
*/
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
- if (pr->power.states[i].valid)
+ if (pr->power.states[i].valid) {
pr->power.count = i;
- if ((pr->power.states[i].valid) &&
- (pr->power.states[i].type >= ACPI_STATE_C2))
- pr->flags.power = 1;
+ if (pr->power.states[i].type >= ACPI_STATE_C2)
+ pr->flags.power = 1;
+ }
}
- return_VALUE(0);
+ return 0;
}
-int acpi_processor_cst_has_changed (struct acpi_processor *pr)
+int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
- int result = 0;
+ int result = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
- if (errata.smp || nocst) {
- return_VALUE(-ENODEV);
+ if (nocst) {
+ return -ENODEV;
}
if (!pr->flags.power_setup_done)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* Fall back to the default idle loop */
pm_idle = pm_idle_save;
- synchronize_kernel();
+ synchronize_sched(); /* Relies on interrupts forcing exit from idle. */
pr->flags.power = 0;
result = acpi_processor_get_power_info(pr);
if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
pm_idle = acpi_processor_idle;
- return_VALUE(result);
+ return result;
}
/* proc interface */
static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
{
- struct acpi_processor *pr = (struct acpi_processor *)seq->private;
- unsigned int i;
+ struct acpi_processor *pr = seq->private;
+ unsigned int i;
- ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show");
if (!pr)
goto end;
seq_printf(seq, "active state: C%zd\n"
- "max_cstate: C%d\n"
- "bus master activity: %08x\n",
- pr->power.state ? pr->power.state - pr->power.states : 0,
- max_cstate,
- (unsigned)pr->power.bm_activity);
+ "max_cstate: C%d\n"
+ "bus master activity: %08x\n"
+ "maximum allowed latency: %d usec\n",
+ pr->power.state ? pr->power.state - pr->power.states : 0,
+ max_cstate, (unsigned)pr->power.bm_activity,
+ system_latency_constraint());
seq_puts(seq, "states:\n");
for (i = 1; i <= pr->power.count; i++) {
seq_printf(seq, " %cC%d: ",
- (&pr->power.states[i] == pr->power.state?'*':' '), i);
+ (&pr->power.states[i] ==
+ pr->power.state ? '*' : ' '), i);
if (!pr->power.states[i].valid) {
seq_puts(seq, "<not supported>\n");
if (pr->power.states[i].promotion.state)
seq_printf(seq, "promotion[C%zd] ",
- (pr->power.states[i].promotion.state -
- pr->power.states));
+ (pr->power.states[i].promotion.state -
+ pr->power.states));
else
seq_puts(seq, "promotion[--] ");
if (pr->power.states[i].demotion.state)
seq_printf(seq, "demotion[C%zd] ",
- (pr->power.states[i].demotion.state -
- pr->power.states));
+ (pr->power.states[i].demotion.state -
+ pr->power.states));
else
seq_puts(seq, "demotion[--] ");
- seq_printf(seq, "latency[%03d] usage[%08d]\n",
- pr->power.states[i].latency,
- pr->power.states[i].usage);
+ seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
+ pr->power.states[i].latency,
+ pr->power.states[i].usage,
+ pr->power.states[i].time);
}
-end:
- return_VALUE(0);
+ end:
+ return 0;
}
static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_processor_power_seq_show,
- PDE(inode)->data);
+ PDE(inode)->data);
}
-static struct file_operations acpi_processor_power_fops = {
- .open = acpi_processor_power_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+static const struct file_operations acpi_processor_power_fops = {
+ .open = acpi_processor_power_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
};
+#ifdef CONFIG_SMP
+static void smp_callback(void *v)
+{
+ /* we already woke the CPU up, nothing more to do */
+}
+
+/*
+ * This function gets called when a part of the kernel has a new latency
+ * requirement. This means we need to get all processors out of their C-state,
+ * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
+ * wakes them all right up.
+ */
+static int acpi_processor_latency_notify(struct notifier_block *b,
+ unsigned long l, void *v)
+{
+ smp_call_function(smp_callback, NULL, 0, 1);
+ return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_processor_latency_notifier = {
+ .notifier_call = acpi_processor_latency_notify,
+};
+#endif
-int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *device)
+int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
+ struct acpi_device *device)
{
- acpi_status status = 0;
- static int first_run = 0;
- struct proc_dir_entry *entry = NULL;
+ acpi_status status = 0;
+ static int first_run;
+ struct proc_dir_entry *entry = NULL;
unsigned int i;
- ACPI_FUNCTION_TRACE("acpi_processor_power_init");
if (!first_run) {
dmi_check_system(processor_power_dmi_table);
if (max_cstate < ACPI_C_STATES_MAX)
- printk(KERN_NOTICE "ACPI: processor limited to max C-state %d\n", max_cstate);
+ printk(KERN_NOTICE
+ "ACPI: processor limited to max C-state %d\n",
+ max_cstate);
first_run++;
+#ifdef CONFIG_SMP
+ register_latency_notifier(&acpi_processor_latency_notifier);
+#endif
}
- if (!errata.smp && (pr->id == 0) && acpi_fadt.cst_cnt && !nocst) {
- status = acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8);
+ if (!pr)
+ return -EINVAL;
+
+ if (acpi_fadt.cst_cnt && !nocst) {
+ status =
+ acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Notifying BIOS of _CST ability failed\n"));
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Notifying BIOS of _CST ability failed"));
}
}
printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id);
for (i = 1; i <= pr->power.count; i++)
if (pr->power.states[i].valid)
- printk(" C%d[C%d]", i, pr->power.states[i].type);
+ printk(" C%d[C%d]", i,
+ pr->power.states[i].type);
printk(")\n");
if (pr->id == 0) {
/* 'power' [R] */
entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER,
- S_IRUGO, acpi_device_dir(device));
+ S_IRUGO, acpi_device_dir(device));
if (!entry)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to create '%s' fs entry\n",
- ACPI_PROCESSOR_FILE_POWER));
+ return -EIO;
else {
entry->proc_fops = &acpi_processor_power_fops;
entry->data = acpi_driver_data(device);
pr->flags.power_setup_done = 1;
- return_VALUE(0);
+ return 0;
}
-int acpi_processor_power_exit(struct acpi_processor *pr, struct acpi_device *device)
+int acpi_processor_power_exit(struct acpi_processor *pr,
+ struct acpi_device *device)
{
- ACPI_FUNCTION_TRACE("acpi_processor_power_exit");
pr->flags.power_setup_done = 0;
if (acpi_device_dir(device))
- remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,acpi_device_dir(device));
+ remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
+ acpi_device_dir(device));
/* Unregister the idle handler when processor #0 is removed. */
if (pr->id == 0) {
* copies of pm_idle before proceeding.
*/
cpu_idle_wait();
+#ifdef CONFIG_SMP
+ unregister_latency_notifier(&acpi_processor_latency_notifier);
+#endif
}
- return_VALUE(0);
+ return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff