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

• Lines: 457
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.21/drivers/acpi/ospm/processor/prperf.c
• Orig date: 2001-10-24 14:06:22.000000000 -0700

diff -urN linux-2.4.21/drivers/acpi/ospm/processor/prperf.c linux-2.4.22/drivers/acpi/ospm/processor/prperf.c
@@ -1,456 +0,0 @@
-/*****************************************************************************
- *
- * Module Name: prperf.c
- *              $Revision: 21 $
- *
- *****************************************************************************/
-
-/*
- *  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: 1. Support ACPI 2.0 processor performance states (not just throttling).
- *      2. Fully implement thermal -vs- power management limit control.
- */
-
-
-#include <acpi.h>
-#include <bm.h>
-#include "pr.h"
-
-#define _COMPONENT		ACPI_PROCESSOR
-	MODULE_NAME		("prperf")
-
-
-/****************************************************************************
- *                                  Globals
- ****************************************************************************/
-
-extern fadt_descriptor_rev2	acpi_fadt;
-const u32			POWER_OF_2[] = {1,2,4,8,16,32,64,128,256,512};
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_get_frequency
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_perf_get_frequency (
-	PR_CONTEXT		*processor,
-	u32			*frequency) {
-	acpi_status		status = AE_OK;
-
-	FUNCTION_TRACE("pr_perf_get_frequency");
-
-	if (!processor || !frequency) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/* TBD: Generic method to calculate processor frequency. */
-
-	return_ACPI_STATUS(status);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_get_state
- *
- * PARAMETERS:
- *
- * RETURN:	
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-/* TBD:	Include support for _real_ performance states (not just throttling). */
-
-acpi_status
-pr_perf_get_state (
-	PR_CONTEXT              *processor,
-	u32                     *state)
-{
-	u32                     pblk_value = 0;
-	u32                     duty_mask = 0;
-	u32                     duty_cycle = 0;
-
-	FUNCTION_TRACE("pr_perf_get_state");
-
-	if (!processor || !state) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	if (processor->performance.state_count == 1) {
-		*state = 0;
-		return_ACPI_STATUS(AE_OK);
-	}
-
-	acpi_os_read_port(processor->pblk.address, &pblk_value, 32);
-
-	/*
-	 * Throttling Enabled?
-	 * -------------------
-	 * If so, calculate the current throttling state, otherwise return
-	 * '100% performance' (state 0).
-	 */
-	if (pblk_value & 0x00000010) {
-
-		duty_mask = processor->performance.state_count - 1;
-		duty_mask <<= acpi_fadt.duty_offset;
-
-		duty_cycle = pblk_value & duty_mask;
-		duty_cycle >>= acpi_fadt.duty_offset;
-
-		if (duty_cycle == 0) {
-			*state = 0;
-		}
-		else {
-			*state = processor->performance.state_count -
-				duty_cycle;
-		}
-	}
-	else {
-		*state = 0;
-	}
-
-	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Processor [%02x] is at performance state [%d%%].\n", processor->device_handle, processor->performance.state[*state].performance));
-
-	return_ACPI_STATUS(AE_OK);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_set_state
- *
- * PARAMETERS:
- *
- * RETURN:      AE_OK
- *              AE_BAD_PARAMETER
- *              AE_BAD_DATA         Invalid target throttling state.
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-/* TBD: Includes support for _real_ performance states (not just throttling). */
-
-acpi_status
-pr_perf_set_state (
-	PR_CONTEXT              *processor,
-	u32                     state)
-{
-	u32                     pblk_value = 0;
-	u32                     duty_mask = 0;
-	u32                     duty_cycle = 0;
-	u32                     i = 0;
-
-	FUNCTION_TRACE ("pr_perf_set_state");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	if (state > (processor->performance.state_count - 1)) {
-		return_ACPI_STATUS(AE_BAD_DATA);
-	}
-
-	if ((state == processor->performance.active_state) ||
-		(processor->performance.state_count == 1)) {
-		return_ACPI_STATUS(AE_OK);
-	}
-
-	/*
-	 * Calculate Duty Cycle/Mask:
-	 * --------------------------
-	 * Note that we don't support duty_cycle values that span bit 4.
-	 */
-	if (state) {
-		duty_cycle = processor->performance.state_count - state;
-		duty_cycle <<= acpi_fadt.duty_offset;
-	}
-	else {
-		duty_cycle = 0;
-	}
-
-	duty_mask = ~((u32)(processor->performance.state_count - 1));
-	for (i=0; i<acpi_fadt.duty_offset; i++) {
-		duty_mask <<= acpi_fadt.duty_offset;
-		duty_mask += 1;
-	}
-
-	/*
-	 * Disable Throttling:
-	 * -------------------
-	 * Got to turn it off before you can change the duty_cycle value.
-	 * Throttling is disabled by writing a 0 to bit 4.
-	 */
-	acpi_os_read_port(processor->pblk.address, &pblk_value, 32);
-	if (pblk_value & 0x00000010) {
-		pblk_value &= 0xFFFFFFEF;
-		acpi_os_write_port(processor->pblk.address, pblk_value, 32);
-	}
-
-	/*
-	 * Set Duty Cycle:
-	 * ---------------
-	 * Mask off the old duty_cycle value, mask in the new.
-	 */
-	pblk_value &= duty_mask;
-	pblk_value |= duty_cycle;
-	acpi_os_write_port(processor->pblk.address, pblk_value, 32);
-
-	/*
-	 * Enable Throttling:
-	 * ------------------
-	 * But only for non-zero (non-100% performance) states.
-	 */
-	if (state) {
-		pblk_value |= 0x00000010;
-		acpi_os_write_port(processor->pblk.address, pblk_value, 32);
-	}
-
-	processor->performance.active_state = state;
-
-	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Processor [%02x] set to performance state [%d%%].\n", processor->device_handle, processor->performance.state[state].performance));
-
-	return_ACPI_STATUS(AE_OK);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_set_limit
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_perf_set_limit (
-	PR_CONTEXT              *processor,
-	u32                     limit)
-{
-	acpi_status		status = AE_OK;
-	PR_PERFORMANCE		*performance = NULL;
-
-	FUNCTION_TRACE ("pr_perf_set_limit");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	performance = &(processor->performance);
-
-	/*
-	 * Set Limit:
-	 * ----------
-	 * TBD:  Properly manage thermal and power limits (only set
-	 *	 performance state iff...).
-	 */
-	switch (limit) {
-
-	case PR_PERF_DEC:
-		if (performance->active_state <
-			(performance->state_count-1)) {
-			status = pr_perf_set_state(processor,
-				(performance->active_state+1));
-		}
-		break;
-
-	case PR_PERF_INC:
-		if (performance->active_state > 0) {
-			status = pr_perf_set_state(processor,
-				(performance->active_state-1));
-		}
-		break;
-
-	case PR_PERF_MAX:
-		if (performance->active_state != 0) {
-			status = pr_perf_set_state(processor, 0);
-		}
-		break;
-
-	default:
-		return_ACPI_STATUS(AE_BAD_DATA);
-		break;
-	}
-
-	if (ACPI_SUCCESS(status)) {
-		performance->thermal_limit = performance->active_state;
-	}
-
-	ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Processor [%02x] thermal performance limit set to [%d%%].\n", processor->device_handle, processor->performance.state[performance->active_state].performance));
-
-	return_ACPI_STATUS(status);
-}
-
-
-/****************************************************************************
- *                             External Functions
- ****************************************************************************/
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_add_device
- *
- * PARAMETERS:  processor		Our processor-specific context.
- *
- * RETURN:      AE_OK
- *              AE_BAD_PARAMETER
- *
- * DESCRIPTION: Calculates the number of throttling states and the state
- *              performance/power values.
- *
- ****************************************************************************/
-
-/* TBD: Support duty_cycle values that span bit 4. */
-
-acpi_status
-pr_perf_add_device (
-	PR_CONTEXT              *processor)
-{
-	acpi_status             status = AE_OK;
-	u32                     i = 0;
-	u32                     performance_step = 0;
-	u32                     percentage = 0;
-
-	FUNCTION_TRACE("pr_perf_add_device");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/*
-	 * Valid PBLK?
-	 * -----------
-	 * For SMP it is common to have the first (boot) processor have a
-	 * valid PBLK while all others do not -- which implies that
-	 * throttling has system-wide effects (duty_cycle programmed into
-	 * the chipset effects all processors).
-	 */
-	if ((processor->pblk.length < 6) || !processor->pblk.address) {
-		processor->performance.state_count = 1;
-	}
-
-	/*
-	 * Valid Duty Offset/Width?
-	 * ------------------------
-	 * We currently only support duty_cycle values that fall within
-	 * bits 0-3, as things get complicated when this value spans bit 4
-	 * (the throttling enable/disable bit).
-	 */
-	else if ((acpi_fadt.duty_offset + acpi_fadt.duty_width) > 4) {
-		processor->performance.state_count = 1;
-	}
-
-	/*
-	 * Compute State Count:
-	 * --------------------
-	 * The number of throttling states is computed as 2^duty_width,
-	 * but limited by PR_MAX_THROTTLE_STATES.  Note that a duty_width
-	 * of zero results is one throttling state (100%).
-	 */
-	else {
-		processor->performance.state_count =
-			POWER_OF_2[acpi_fadt.duty_width];
-	}
-
-	if (processor->performance.state_count > PR_MAX_THROTTLE_STATES) {
-		processor->performance.state_count = PR_MAX_THROTTLE_STATES;
-	}
-
-	/*
-	 * Compute State Values:
-	 * ---------------------
-	 * Note that clock throttling displays a linear power/performance
-	 * relationship (at 50% performance the CPU will consume 50% power).
-	 */
-	performance_step = (1000 / processor->performance.state_count);
-
-	for (i=0; i<processor->performance.state_count; i++) {
-		percentage = (1000 - (performance_step * i))/10;
-		processor->performance.state[i].performance = percentage;
-		processor->performance.state[i].power = percentage;
-	}
-
-	/*
-	 * Get Current State:
-	 * ------------------
-	 */
-	status = pr_perf_get_state(processor, &(processor->performance.active_state));
-	if (ACPI_FAILURE(status)) {
-		return_ACPI_STATUS(status);
-	}
-
-	/*
-	 * Set to Maximum Performance:
-	 * ---------------------------
-	 * We'll let subsequent policy (e.g. thermal/power) decide to lower
-	 * performance if it so chooses, but for now crank up the speed.
-	 */
-	if (0 != processor->performance.active_state) {
-		status = pr_perf_set_state(processor, 0);
-	}
-
-	return_ACPI_STATUS(status);
-}
-
-
-/****************************************************************************
- *
- * FUNCTION:    pr_perf_remove_device
- *
- * PARAMETERS:
- *
- * RETURN:	
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
-
-acpi_status
-pr_perf_remove_device (
-	PR_CONTEXT              *processor)
-{
-	acpi_status             status = AE_OK;
-
-	FUNCTION_TRACE("pr_perf_remove_device");
-
-	if (!processor) {
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	MEMSET(&(processor->performance), 0, sizeof(PR_PERFORMANCE));
-
-	return_ACPI_STATUS(status);
-}
-