patch-2.4.22 linux-2.4.22/drivers/acpi/ospm/processor/prpower.c

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diff -urN linux-2.4.21/drivers/acpi/ospm/processor/prpower.c linux-2.4.22/drivers/acpi/ospm/processor/prpower.c
@@ -1,665 +0,0 @@
-/*****************************************************************************
- *
- * Module Name: prpower.c
- *   $Revision: 32 $
- *
- *****************************************************************************/
-
-/*
- *  Copyright (C) 2000, 2001 Andrew Grover
- *
- *  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
- */
-
-
-/* TBD: Linux specific */
-#include <linux/sched.h>
-#include <linux/pm.h>
-#include <asm/io.h>
-
-#include <acpi.h>
-#include <bm.h>
-#include "pr.h"
-
-#define _COMPONENT		ACPI_PROCESSOR
-	MODULE_NAME		("prpower")
-
-
-/****************************************************************************
- *                                  Globals
- ****************************************************************************/
-
-extern FADT_DESCRIPTOR		acpi_fadt;
-static u32			last_idle_jiffies = 0;
-static PR_CONTEXT		*processor_list[NR_CPUS];
-static void			(*pr_pm_idle_save)(void) = NULL;
-static u8			bm_control = 0;
-
-
-/* Used for PIIX4 errata handling. */
-unsigned short			acpi_piix4_bmisx = 0;
-
-
-/****************************************************************************
- *                             External Functions
- ****************************************************************************/
-
-/****************************************************************************
- *
- * FUNCTION:    pr_power_activate_state
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-void
-pr_power_activate_state (
-	PR_CONTEXT		*processor,
-	u32			next_state)
-{
-
-	PROC_NAME("pr_power_activate_state");
-
-	if (!processor) {
-		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.\n"));
-		return;
-	}
-
-	processor->power.state[processor->power.active_state].promotion.count = 0;
-	processor->power.state[processor->power.active_state].demotion.count = 0;
-
-	/*
-	 * Cleanup from old state.
-	 */
-	switch (processor->power.active_state) {
-
-	case PR_C3:
-		/* Disable bus master reload */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_DO_NOT_LOCK,
-			BM_RLD, 0);
-		break;
-	}
-
-	/*
-	 * Prepare to use new state.
-	 */
-	switch (next_state) {
-
-	case PR_C3:
-		/* Enable bus master reload */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_DO_NOT_LOCK,
-			BM_RLD, 1);
-		break;
-	}
-
-	processor->power.active_state = next_state;
-	
-	return;
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_power_idle
- *
- * PARAMETERS:  <none>
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-void
-pr_power_idle (void)
-{
-	PR_CX			*c_state = NULL;
-	u32			next_state = 0;
-	u32			start_ticks, end_ticks, time_elapsed;
-	PR_CONTEXT		*processor = NULL;
-
-	PROC_NAME("pr_power_idle");
-
-	processor = processor_list[smp_processor_id()];
-
-	if (!processor || processor->power.active_state == PR_C0) {
-		return;
-	}
-
-	next_state = processor->power.active_state;
-
-	/*
-	 * Check OS Idleness:
-	 * ------------------
-	 * If the OS has been busy (hasn't called the idle handler in a while)
-	 * then automatically demote to the default power state (e.g. C1).
-	 *
-	 * TBD: Optimize by having scheduler determine business instead
-	 *      of having us try to calculate it.
-	 */
-	if (processor->power.active_state != processor->power.default_state) {
-		if ((jiffies - last_idle_jiffies) >= processor->power.busy_metric) {
-			next_state = processor->power.default_state;
-			if (next_state != processor->power.active_state) {
-				pr_power_activate_state(processor, next_state);
-			}
-		}
-	}
-
-	disable();
-
-	/*
-	 * Log BM Activity:
-	 * ----------------
-	 * Read BM_STS and record its value for later use by C3 policy.
-	 * (Note that we save the BM_STS values for the last 32 cycles).
-	 */
-	if (bm_control) {
-		processor->power.bm_activity <<= 1;
-		if (acpi_hw_register_bit_access(ACPI_READ, ACPI_MTX_DO_NOT_LOCK, BM_STS)) {
-			processor->power.bm_activity |= 1;
-			acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_DO_NOT_LOCK,
-				BM_STS, 1);
-		}
-		else if (acpi_piix4_bmisx) {
-			/*
-			 * PIIX4 Errata:
-			 * -------------
-			 * This code is a workaround for errata #18 "C3 Power State/
-			 * BMIDE and Type-F DMA Livelock" from the July '01 PIIX4
-			 * specification update.  Note that BM_STS doesn't always
-			 * reflect the true state of bus mastering activity; forcing
-			 * us to manually check the BMIDEA bit of each IDE channel.
-			 */
-			if ((inb_p(acpi_piix4_bmisx + 0x02) & 0x01) ||
-				(inb_p(acpi_piix4_bmisx + 0x0A) & 0x01))
-				processor->power.bm_activity |= 1;
-		}
-	}
-
-	c_state = &(processor->power.state[processor->power.active_state]);
-
-	c_state->utilization++;
-
-	/*
-	 * Sleep:
-	 * ------
-	 * Invoke the current Cx state to put the processor to sleep.
-	 */
-	switch (processor->power.active_state) {
-
-	case PR_C1:
-		/* Invoke C1 */
-		enable(); halt();
-		/*
-	 * TBD: Can't get time duration while in C1, as resumes
-		 *      go to an ISR rather than here.
-		 */
-		time_elapsed = 0xFFFFFFFF;
-		break;
-
-	case PR_C2:
-		/* See how long we're asleep for */
-		acpi_get_timer(&start_ticks);
-		/* Invoke C2 */
-		acpi_os_read_port(processor->power.p_lvl2, NULL, 8);
-		/* Dummy op - must do something useless after P_LVL2 read */
-		acpi_hw_register_bit_access(ACPI_READ, ACPI_MTX_DO_NOT_LOCK, BM_STS);
-		/* Compute time elapsed */
-		acpi_get_timer(&end_ticks);
-		/* Re-enable interrupts */
-		enable();
-		acpi_get_timer_duration(start_ticks, end_ticks, &time_elapsed);
-		break;
-
-	case PR_C3:
-		/* Disable bus master arbitration */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_DO_NOT_LOCK, ARB_DIS, 1);
-		/* See how long we're asleep for */
-		acpi_get_timer(&start_ticks);
-		/* Invoke C3 */
-		acpi_os_read_port(processor->power.p_lvl3, NULL, 8);
-		/* Dummy op - must do something useless after P_LVL3 read */
-		acpi_hw_register_bit_access(ACPI_READ, ACPI_MTX_DO_NOT_LOCK, BM_STS);
-		/* Compute time elapsed */
-		acpi_get_timer(&end_ticks);
-		/* Enable bus master arbitration */
-		acpi_hw_register_bit_access(ACPI_WRITE, ACPI_MTX_DO_NOT_LOCK,
-			ARB_DIS, 0);
-		/* Re-enable interrupts */
-		enable();
-		acpi_get_timer_duration(start_ticks, end_ticks, &time_elapsed);
-		break;
-
-	default:
-		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Attempt to use unsupported power state C%d.\n", processor->power.active_state));
-		enable();
-		break;
-	}
-
-	/*
-	 * Promotion?
-	 * ----------
-	 * Track the number of successful sleeps (time asleep is greater
-	 * than time_threshold) and promote when count_threshold is
-	 * reached.
-	 */
-	if ((c_state->promotion.target_state) && 	
-		(time_elapsed >= c_state->promotion.time_threshold)) {
-
-		c_state->promotion.count++;
- 		c_state->demotion.count = 0;
-
-		if (c_state->promotion.count >= c_state->promotion.count_threshold) {
-			/*
-			 * Bus Mastering Activity, if active and used
-			 * by this state's promotion policy, prevents
-			 * promotions from occuring.
-			 */
-			if (!bm_control || !(processor->power.bm_activity & c_state->promotion.bm_threshold))
-				next_state = c_state->promotion.target_state;
-		}
-	}
-
-	/*
-	 * Demotion?
-	 * ---------
-	 * Track the number of shorts (time asleep is less than
-	 * time_threshold) and demote when count_threshold is reached.
-	 */
-	if (c_state->demotion.target_state) {
-			
-		if (time_elapsed < c_state->demotion.time_threshold) {
-
-			c_state->demotion.count++;
-			c_state->promotion.count = 0;
-
-			if (c_state->demotion.count >=
-				c_state->demotion.count_threshold) {
-				next_state = c_state->demotion.target_state;
-			}
-		}
-
-		/*
-		 * Bus Mastering Activity, if active and used by this
-		 * state's promotion policy, causes an immediate demotion
-		 * to occur.
-		 */
-		if (bm_control && (processor->power.bm_activity & c_state->demotion.bm_threshold))
-			next_state = c_state->demotion.target_state;
-	}
-
-	/*
-	 * New Cx State?
-	 * -------------
-	 * If we're going to start using a new Cx state we must clean up
-	 * from the previous and prepare to use the new.
-	 */
-	if (next_state != processor->power.active_state) {
-		pr_power_activate_state(processor, next_state);
-		processor->power.active_state = processor->power.active_state;
-	}
-
-	/*
-	 * Track OS Idleness:
-	 * ------------------
-	 * Record a jiffies timestamp to compute time elapsed between calls
-	 * to the idle handler.
-	 */
-	last_idle_jiffies = jiffies;
-
-	return;
-}
-
-
-/*****************************************************************************
- *
- * FUNCTION:    pr_power_set_default_policy
- *
- * PARAMETERS:
- *
- * RETURN:	
- *
- * DESCRIPTION: Sets the default Cx state policy (OS idle handler).  Our
- *              scheme is to promote quickly to C2 but more conservatively
- *              to C3.  We're favoring C2 for its characteristics of low
- *              latency (quick response), good power savings, and ability
- *              to allow bus mastering activity.
- *
- *              Note that Cx state policy is completely customizable, with
- *              the goal of having heuristics to alter policy dynamically.
- *
- ****************************************************************************/
-
-acpi_status
-pr_power_set_default_policy (
-	PR_CONTEXT                 *processor)
-{
-	FUNCTION_TRACE("pr_power_set_default_policy");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/*
-	 * Busy Metric:
-	 * ------------
-	 * Used to determine when the OS has been busy and thus when
-	 * policy should return to using the default Cx state (e.g. C1).
-	 * On Linux we use the number of jiffies (scheduler quantums)
-	 * that transpire between calls to the idle handler.
-	 *
-	 * TBD: Linux-specific.
-	 */
-	processor->power.busy_metric = 2;
-
-	/*
-	 * C1:
-	 * ---
-	 * C1 serves as our default state.  It must be valid.
-	 */
-	if (processor->power.state[PR_C1].is_valid) {
-		processor->power.active_state =
-			processor->power.default_state = PR_C1;
-	}
-	else {
-		processor->power.active_state =
-			processor->power.default_state = PR_C0;
-		return_ACPI_STATUS(AE_OK);
-	}
-
-	/*
-	 * C2:
-	 * ---
-	 * Set default C1 promotion and C2 demotion policies.
-	 */
-	if (processor->power.state[PR_C2].is_valid) {
-		/*
-		 * Promote from C1 to C2 anytime we're asleep in C1 for
-		 * longer than two times the C2 latency (to amortize cost
-		 * of transition).  Demote from C2 to C1 anytime we're
-		 * asleep in C2 for less than this time.
-		 */
-		processor->power.state[PR_C1].promotion.count_threshold = 10;
-		processor->power.state[PR_C1].promotion.time_threshold =
-			2 * processor->power.state[PR_C2].latency;
-		processor->power.state[PR_C1].promotion.target_state = PR_C2;
-
-		processor->power.state[PR_C2].demotion.count_threshold = 1;
-		processor->power.state[PR_C2].demotion.time_threshold =
-			2 * processor->power.state[PR_C2].latency;
-		processor->power.state[PR_C2].demotion.target_state = PR_C1;
-	}
-
-	/*
-	 * C3:
-	 * ---
-	 * Set default C2 promotion and C3 demotion policies.
-	 */
-	if ((processor->power.state[PR_C2].is_valid) &&
-		(processor->power.state[PR_C3].is_valid)) {
-		/*
-		 * Promote from C2 to C3 after 4 cycles of no bus
-		 * mastering activity (while maintaining sleep time
-		 * criteria).  Demote immediately on a short or
-		 * whenever bus mastering activity occurs.
-		 */
-		processor->power.state[PR_C2].promotion.count_threshold = 1;
-		processor->power.state[PR_C2].promotion.time_threshold =
-			2 * processor->power.state[PR_C3].latency;
-		processor->power.state[PR_C2].promotion.bm_threshold =
-			0x0000000F;
-		processor->power.state[PR_C2].promotion.target_state =
-			PR_C3;
-
-		processor->power.state[PR_C3].demotion.count_threshold = 1;
-		processor->power.state[PR_C3].demotion.time_threshold =
-			2 * processor->power.state[PR_C3].latency;
-		processor->power.state[PR_C3].demotion.bm_threshold =
-			0x0000000F;
-		processor->power.state[PR_C3].demotion.target_state =
-			PR_C2;
-	}
-
-	return_ACPI_STATUS(AE_OK);
-}
-
-/*****************************************************************************
- *
- * FUNCTION:    pr_power_add_device
- *
- * PARAMETERS:  <none>
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-/*
- * TBD: 1. PROC_C1 support.
- *      2. Symmetric Cx state support (different Cx states supported
- *         by different CPUs results in lowest common denominator).
- */
-
-acpi_status
-pr_power_add_device (
-	PR_CONTEXT                 *processor)
-{
-	FUNCTION_TRACE("pr_power_add_device");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/*
-	 * State Count:
-	 * ------------
-	 * Fixed at four (C0-C3).  We use is_valid to determine whether or
-	 * not a state actually gets used.
-	 */
-	processor->power.state_count = PR_MAX_POWER_STATES;
-
-	/*
-	 * C0:
-	 * ---
-	 * C0 exists only as filler in our array. (Let's assume its valid!)
-	 */
-	processor->power.state[PR_C0].is_valid = TRUE;
-
-	/*
-	 * C1:
-	 * ---
-	 * ACPI states that C1 must be supported by all processors
-	 * with a latency so small that it can be ignored.
-	 *
-	 * TBD: What about PROC_C1 support?
-	 */
-	processor->power.state[PR_C1].is_valid = TRUE;
-
-	/*
-	 * C2:
-	 * ---
-	 * We're only supporting C2 on UP systems with latencies <= 100us.
-	 *
-	 * TBD: Support for C2 on MP (P_LVL2_UP) -- I'm taking the
-	 *      conservative approach for now.
-	 */
-	processor->power.state[PR_C2].latency = acpi_fadt.plvl2_lat;
-
-#ifdef CONFIG_SMP
-	if (smp_num_cpus == 1) {
-#endif /*CONFIG_SMP*/
-		if (acpi_fadt.plvl2_lat <= PR_MAX_C2_LATENCY) {
-			processor->power.state[PR_C2].is_valid = TRUE;
-			processor->power.p_lvl2 = processor->pblk.address + 4;
-		}
-#ifdef CONFIG_SMP
-	}
-#endif /*CONFIG_SMP*/
-
-
-	/*
-	 * C3:
-	 * ---
-	 * We're only supporting C3 on UP systems with latencies <= 1000us,
-	 * and that include the ability to disable bus mastering while in
-	 * C3 (ARB_DIS) but allows bus mastering requests to wake the system
-	 * from C3 (BM_RLD).  Note his method of maintaining cache coherency
-	 * (disabling of bus mastering) cannot be used on SMP systems, and
-	 * flushing caches (e.g. WBINVD) is simply too costly at this time.
-	 *
-	 * TBD: Support for C3 on MP -- I'm taking the conservative
-	 *      approach for now.
-	 */
-	processor->power.state[PR_C3].latency = acpi_fadt.plvl3_lat;
-
-#ifdef CONFIG_SMP
-	if (smp_num_cpus == 1) {
-#endif /*CONFIG_SMP*/
-		if ((acpi_fadt.plvl3_lat <= PR_MAX_C3_LATENCY) && bm_control) {
-			processor->power.state[PR_C3].is_valid = TRUE;
-			processor->power.p_lvl3 = processor->pblk.address + 5;
-		}
-#ifdef CONFIG_SMP
-	}
-#endif /*CONFIG_SMP*/
-
-	/*
-	 * Set Default Policy:
-	 * -------------------
-	 * Now that we know which state are supported, set the default
-	 * policy.  Note that this policy can be changed dynamically
-	 * (e.g. encourage deeper sleeps to conserve battery life when
-	 * not on AC).
-	 */
-	pr_power_set_default_policy(processor);
-
-	/*
-	 * Save Processor Context:
-	 * -----------------------
-	 * TBD: Enhance Linux idle handler to take processor context
-	 *      parameter.
-	 */
-	processor_list[processor->uid] = processor;
-
-	return_ACPI_STATUS(AE_OK);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_power_remove_device
- *
- * PARAMETERS:
- *
- * RETURN:	
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_power_remove_device (
-	PR_CONTEXT              *processor)
-{
-	acpi_status             status = AE_OK;
-
-	FUNCTION_TRACE("pr_power_remove_device");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	MEMSET(&(processor->power), 0, sizeof(PR_POWER));
-
-	processor_list[processor->uid] = NULL;
-
-	return_ACPI_STATUS(status);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_power_initialize
- *
- * PARAMETERS:  <none>
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_power_initialize (void)
-{
-	u32			i = 0;
-
-	FUNCTION_TRACE("pr_power_initialize");
-
-	/* TBD: Linux-specific. */
-	for (i=0; i<NR_CPUS; i++) {
-		processor_list[i] = NULL;
-	}
-
-	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Max CPUs[%d], this CPU[%d].\n", NR_CPUS, smp_processor_id()));
-
-	/* Only use C3 if we can control bus mastering. */
-	if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len)
-		bm_control = 1;
-
-	/*
-	 * Install idle handler.
-	 *
-	 * TBD: Linux-specific (need OSL function).
-	 */
-	pr_pm_idle_save = pm_idle;
-	pm_idle = pr_power_idle;
-
-	return_ACPI_STATUS(AE_OK);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_power_terminate
- *
- * PARAMETERS:  <none>
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_power_terminate (void)
-{
-	FUNCTION_TRACE("pr_power_terminate");
-
-	/*
-	 * Remove idle handler.
-	 *
-	 * TBD: Linux-specific (need OSL function).
-	 */
-	pm_idle = pr_pm_idle_save;
-
-	return_ACPI_STATUS(AE_OK);
-}

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