patch-2.4.22 linux-2.4.22/drivers/acpi/processor.c
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- Lines: 2329
- Date:
2003-08-25 04:44:41.000000000 -0700
- Orig file:
linux-2.4.21/drivers/acpi/processor.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/drivers/acpi/processor.c linux-2.4.22/drivers/acpi/processor.c
@@ -0,0 +1,2328 @@
+/*
+ * acpi_processor.c - ACPI Processor Driver ($Revision: 69 $)
+ *
+ * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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. Make # power/performance states dynamic.
+ * 2. Support duty_cycle values that span bit 4.
+ * 3. Optimize by having scheduler determine business instead of
+ * having us try to calculate it here.
+ * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/pm.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/delay.h>
+#include <linux/compatmac.h>
+#include <linux/proc_fs.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define _COMPONENT ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME ("acpi_processor")
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+#define PREFIX "ACPI: "
+
+#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) */
+
+#define ACPI_PROCESSOR_BUSY_METRIC 10
+
+#define ACPI_PROCESSOR_MAX_POWER ACPI_C_STATE_COUNT
+#define ACPI_PROCESSOR_MAX_C2_LATENCY 100
+#define ACPI_PROCESSOR_MAX_C3_LATENCY 1000
+
+#define ACPI_PROCESSOR_MAX_PERFORMANCE 8
+
+#define ACPI_PROCESSOR_MAX_THROTTLING 16
+#define ACPI_PROCESSOR_MAX_THROTTLE 250 /* 25% */
+#define ACPI_PROCESSOR_MAX_DUTY_WIDTH 4
+
+const u32 POWER_OF_2[] = {1,2,4,8,16,32,64};
+
+#define ACPI_PROCESSOR_LIMIT_USER 0
+#define ACPI_PROCESSOR_LIMIT_THERMAL 1
+
+static int acpi_processor_add (struct acpi_device *device);
+static int acpi_processor_remove (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_processor_driver = {
+ .name = ACPI_PROCESSOR_DRIVER_NAME,
+ .class = ACPI_PROCESSOR_CLASS,
+ .ids = ACPI_PROCESSOR_HID,
+ .ops = {
+ .add = acpi_processor_add,
+ .remove = acpi_processor_remove,
+ },
+};
+
+/* Power Management */
+
+struct acpi_processor_cx_policy {
+ u32 count;
+ int state;
+ struct {
+ u32 time;
+ u32 ticks;
+ u32 count;
+ u32 bm;
+ } threshold;
+};
+
+struct acpi_processor_cx {
+ u8 valid;
+ u32 address;
+ u32 latency;
+ u32 latency_ticks;
+ u32 power;
+ u32 usage;
+ struct acpi_processor_cx_policy promotion;
+ struct acpi_processor_cx_policy demotion;
+};
+
+struct acpi_processor_power {
+ int state;
+ int default_state;
+ u32 bm_activity;
+ struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
+};
+
+/* Performance Management */
+
+struct acpi_pct_register {
+ u8 descriptor;
+ u16 length;
+ u8 space_id;
+ u8 bit_width;
+ u8 bit_offset;
+ u8 reserved;
+ u64 address;
+} __attribute__ ((packed));
+
+struct acpi_processor_px {
+ acpi_integer core_frequency; /* megahertz */
+ acpi_integer power; /* milliWatts */
+ acpi_integer transition_latency; /* microseconds */
+ acpi_integer bus_master_latency; /* microseconds */
+ acpi_integer control; /* control value */
+ acpi_integer status; /* success indicator */
+};
+
+struct acpi_processor_performance {
+ int state;
+ int platform_limit;
+ u16 control_register;
+ u16 status_register;
+ int state_count;
+ struct acpi_processor_px states[ACPI_PROCESSOR_MAX_PERFORMANCE];
+};
+
+
+/* Throttling Control */
+
+struct acpi_processor_tx {
+ u16 power;
+ u16 performance;
+};
+
+struct acpi_processor_throttling {
+ int state;
+ u32 address;
+ u8 duty_offset;
+ u8 duty_width;
+ int state_count;
+ struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
+};
+
+/* Limit Interface */
+
+struct acpi_processor_lx {
+ int px; /* performace state */
+ int tx; /* throttle level */
+};
+
+struct acpi_processor_limit {
+ struct acpi_processor_lx state; /* current limit */
+ struct acpi_processor_lx thermal; /* thermal limit */
+ struct acpi_processor_lx user; /* user limit */
+};
+
+
+struct acpi_processor_flags {
+ u8 power:1;
+ u8 performance:1;
+ u8 throttling:1;
+ u8 limit:1;
+ u8 bm_control:1;
+ u8 bm_check:1;
+ u8 reserved:2;
+};
+
+struct acpi_processor {
+ acpi_handle handle;
+ u32 acpi_id;
+ u32 id;
+ struct acpi_processor_flags flags;
+ struct acpi_processor_power power;
+ struct acpi_processor_performance performance;
+ struct acpi_processor_throttling throttling;
+ struct acpi_processor_limit limit;
+};
+
+struct acpi_processor_errata {
+ u8 smp;
+ struct {
+ u8 throttle:1;
+ u8 fdma:1;
+ u8 reserved:6;
+ u32 bmisx;
+ } piix4;
+};
+
+static struct acpi_processor *processors[NR_CPUS];
+static struct acpi_processor_errata errata;
+static void (*pm_idle_save)(void) = NULL;
+
+
+/* --------------------------------------------------------------------------
+ Errata Handling
+ -------------------------------------------------------------------------- */
+
+int
+acpi_processor_errata_piix4 (
+ struct pci_dev *dev)
+{
+ u8 rev = 0;
+ u8 value1 = 0;
+ u8 value2 = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
+
+ if (!dev)
+ return_VALUE(-EINVAL);
+
+ /*
+ * Note that 'dev' references the PIIX4 ACPI Controller.
+ */
+
+ pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
+
+ switch (rev) {
+ case 0:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
+ break;
+ case 1:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
+ break;
+ case 2:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
+ break;
+ case 3:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
+ break;
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
+ break;
+ }
+
+ switch (rev) {
+
+ case 0: /* PIIX4 A-step */
+ case 1: /* PIIX4 B-step */
+ /*
+ * See specification changes #13 ("Manual Throttle Duty Cycle")
+ * and #14 ("Enabling and Disabling Manual Throttle"), plus
+ * erratum #5 ("STPCLK# Deassertion Time") from the January
+ * 2002 PIIX4 specification update. Applies to only older
+ * PIIX4 models.
+ */
+ errata.piix4.throttle = 1;
+
+ case 2: /* PIIX4E */
+ case 3: /* PIIX4M */
+ /*
+ * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
+ * Livelock") from the January 2002 PIIX4 specification update.
+ * Applies to all PIIX4 models.
+ */
+
+ /*
+ * BM-IDE
+ * ------
+ * Find the PIIX4 IDE Controller and get the Bus Master IDE
+ * Status register address. We'll use this later to read
+ * each IDE controller's DMA status to make sure we catch all
+ * DMA activity.
+ */
+ dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82371AB,
+ PCI_ANY_ID, PCI_ANY_ID, NULL);
+ if (dev)
+ errata.piix4.bmisx = pci_resource_start(dev, 4);
+
+ /*
+ * Type-F DMA
+ * ----------
+ * Find the PIIX4 ISA Controller and read the Motherboard
+ * DMA controller's status to see if Type-F (Fast) DMA mode
+ * is enabled (bit 7) on either channel. Note that we'll
+ * disable C3 support if this is enabled, as some legacy
+ * devices won't operate well if fast DMA is disabled.
+ */
+ dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82371AB_0,
+ PCI_ANY_ID, PCI_ANY_ID, NULL);
+ if (dev) {
+ pci_read_config_byte(dev, 0x76, &value1);
+ pci_read_config_byte(dev, 0x77, &value2);
+ if ((value1 & 0x80) || (value2 & 0x80))
+ errata.piix4.fdma = 1;
+ }
+
+ break;
+ }
+
+ if (errata.piix4.bmisx)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Bus master activity detection (BM-IDE) erratum enabled\n"));
+ if (errata.piix4.fdma)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Type-F DMA livelock erratum (C3 disabled)\n"));
+
+ return_VALUE(0);
+}
+
+
+int
+acpi_processor_errata (
+ struct acpi_processor *pr)
+{
+ int result = 0;
+ struct pci_dev *dev = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_errata");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ /*
+ * PIIX4
+ */
+ dev = pci_find_subsys(PCI_VENDOR_ID_INTEL,
+ PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID, PCI_ANY_ID, NULL);
+ if (dev)
+ result = acpi_processor_errata_piix4(dev);
+
+ return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+ Power Management
+ -------------------------------------------------------------------------- */
+
+static inline u32
+ticks_elapsed (
+ u32 t1,
+ u32 t2)
+{
+ if (t2 >= t1)
+ return (t2 - t1);
+ else if (!acpi_fadt.tmr_val_ext)
+ return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
+ else
+ return ((0xFFFFFFFF - t1) + t2);
+}
+
+
+static void
+acpi_processor_power_activate (
+ struct acpi_processor *pr,
+ int state)
+{
+ if (!pr)
+ return;
+
+ pr->power.states[pr->power.state].promotion.count = 0;
+ pr->power.states[pr->power.state].demotion.count = 0;
+
+ /* Cleanup from old state. */
+ switch (pr->power.state) {
+ case ACPI_STATE_C3:
+ /* Disable bus master reload */
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK);
+ break;
+ }
+
+ /* Prepare to use new state. */
+ switch (state) {
+ case ACPI_STATE_C3:
+ /* Enable bus master reload */
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK);
+ break;
+ }
+
+ pr->power.state = state;
+
+ return;
+}
+
+
+static void
+acpi_processor_idle (void)
+{
+ struct acpi_processor *pr = NULL;
+ struct acpi_processor_cx *cx = NULL;
+ int next_state = 0;
+ int sleep_ticks = 0;
+ u32 t1, t2 = 0;
+
+ pr = processors[smp_processor_id()];
+ if (!pr)
+ return;
+
+ /*
+ * Interrupts must be disabled during bus mastering calculations and
+ * for C2/C3 transitions.
+ */
+ __cli();
+
+ cx = &(pr->power.states[pr->power.state]);
+
+ /*
+ * Check BM Activity
+ * -----------------
+ * Check for bus mastering activity (if required), record, and check
+ * for demotion.
+ */
+ if (pr->flags.bm_check) {
+ u32 bm_status = 0;
+
+ pr->power.bm_activity <<= 1;
+
+ acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS,
+ &bm_status, ACPI_MTX_DO_NOT_LOCK);
+ if (bm_status) {
+ pr->power.bm_activity++;
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS,
+ 1, ACPI_MTX_DO_NOT_LOCK);
+ }
+ /*
+ * PIIX4 Erratum #18: 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.
+ */
+ else if (errata.piix4.bmisx) {
+ if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
+ || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
+ pr->power.bm_activity++;
+ }
+ /*
+ * Apply bus mastering demotion policy. Automatically 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.
+ *
+ * TBD: A better policy might be to fallback to the demotion
+ * state (use it for this quantum only) istead of
+ * demoting -- and rely on duration as our sole demotion
+ * qualification. This may, however, introduce DMA
+ * issues (e.g. floppy DMA transfer overrun/underrun).
+ */
+ if (pr->power.bm_activity & cx->demotion.threshold.bm) {
+ __sti();
+ next_state = cx->demotion.state;
+ goto end;
+ }
+ }
+
+ cx->usage++;
+
+ /*
+ * Sleep:
+ * ------
+ * Invoke the current Cx state to put the processor to sleep.
+ */
+ switch (pr->power.state) {
+
+ case ACPI_STATE_C1:
+ /* Invoke C1. */
+ safe_halt();
+ /*
+ * TBD: Can't get time duration while in C1, as resumes
+ * go to an ISR rather than here. Need to instrument
+ * base interrupt handler.
+ */
+ sleep_ticks = 0xFFFFFFFF;
+ break;
+
+ case ACPI_STATE_C2:
+ /* Get start time (ticks) */
+ t1 = inl(acpi_fadt.xpm_tmr_blk.address);
+ /* Invoke C2 */
+ inb(pr->power.states[ACPI_STATE_C2].address);
+ /* Dummy op - must do something useless after P_LVL2 read */
+ t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ /* Get end time (ticks) */
+ t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ /* Re-enable interrupts */
+ __sti();
+ /* Compute time (ticks) that we were actually asleep */
+ 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);
+ /* Get start time (ticks) */
+ t1 = inl(acpi_fadt.xpm_tmr_blk.address);
+ /* Invoke C3 */
+ inb(pr->power.states[ACPI_STATE_C3].address);
+ /* Dummy op - must do something useless after P_LVL3 read */
+ t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+ /* 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);
+ /* Re-enable interrupts */
+ __sti();
+ /* Compute time (ticks) that we were actually asleep */
+ sleep_ticks = ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD;
+ break;
+
+ default:
+ __sti();
+ return;
+ }
+
+ next_state = pr->power.state;
+
+ /*
+ * Promotion?
+ * ----------
+ * Track the number of longs (time asleep is greater than threshold)
+ * and promote when the count threshold is reached. Note that bus
+ * mastering activity may prevent promotions.
+ */
+ if (cx->promotion.state) {
+ if (sleep_ticks > cx->promotion.threshold.ticks) {
+ cx->promotion.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;
+ goto end;
+ }
+ }
+ else {
+ next_state = cx->promotion.state;
+ goto end;
+ }
+ }
+ }
+ }
+
+ /*
+ * Demotion?
+ * ---------
+ * Track the number of shorts (time asleep is less than time threshold)
+ * and demote when the usage threshold is reached.
+ */
+ if (cx->demotion.state) {
+ if (sleep_ticks < cx->demotion.threshold.ticks) {
+ cx->demotion.count++;
+ cx->promotion.count = 0;
+ if (cx->demotion.count >= cx->demotion.threshold.count) {
+ next_state = cx->demotion.state;
+ goto end;
+ }
+ }
+ }
+
+end:
+ /*
+ * 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 != pr->power.state)
+ acpi_processor_power_activate(pr, next_state);
+
+ return;
+}
+
+
+static int
+acpi_processor_set_power_policy (
+ struct acpi_processor *pr)
+{
+ ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy");
+
+ /*
+ * This function 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 the Cx state policy is completely
+ * customizable and can be altered dynamically.
+ */
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ /*
+ * C0/C1
+ * -----
+ */
+ pr->power.state = ACPI_STATE_C1;
+ pr->power.default_state = ACPI_STATE_C1;
+
+ /*
+ * C1/C2
+ * -----
+ * Set the default C1 promotion and C2 demotion policies, where we
+ * promote from C1 to C2 after several (10) successive C1 transitions,
+ * as we cannot (currently) measure the time spent in C1. Demote from
+ * C2 to C1 anytime we experience a 'short' (time spent in C2 is less
+ * than the C2 transtion latency). Note the simplifying assumption
+ * that the 'cost' of a transition is amortized when we sleep for at
+ * least as long as the transition's latency (thus the total transition
+ * time is two times the latency).
+ *
+ * TBD: Measure C1 sleep times by instrumenting the core IRQ handler.
+ * TBD: Demote to default C-State after long periods of activity.
+ * TBD: Investigate policy's use of CPU utilization -vs- sleep duration.
+ */
+ if (pr->power.states[ACPI_STATE_C2].valid) {
+ pr->power.states[ACPI_STATE_C1].promotion.threshold.count = 10;
+ pr->power.states[ACPI_STATE_C1].promotion.threshold.ticks =
+ pr->power.states[ACPI_STATE_C2].latency_ticks;
+ pr->power.states[ACPI_STATE_C1].promotion.state = ACPI_STATE_C2;
+
+ pr->power.states[ACPI_STATE_C2].demotion.threshold.count = 1;
+ pr->power.states[ACPI_STATE_C2].demotion.threshold.ticks =
+ pr->power.states[ACPI_STATE_C2].latency_ticks;
+ pr->power.states[ACPI_STATE_C2].demotion.state = ACPI_STATE_C1;
+ }
+
+ /*
+ * C2/C3
+ * -----
+ * Set default C2 promotion and C3 demotion policies, where we promote
+ * from C2 to C3 after several (4) cycles of no bus mastering activity
+ * while maintaining sleep time criteria. Demote immediately on a
+ * short or whenever bus mastering activity occurs.
+ */
+ if ((pr->power.states[ACPI_STATE_C2].valid) &&
+ (pr->power.states[ACPI_STATE_C3].valid)) {
+ pr->power.states[ACPI_STATE_C2].promotion.threshold.count = 4;
+ pr->power.states[ACPI_STATE_C2].promotion.threshold.ticks =
+ pr->power.states[ACPI_STATE_C3].latency_ticks;
+ pr->power.states[ACPI_STATE_C2].promotion.threshold.bm = 0x0F;
+ pr->power.states[ACPI_STATE_C2].promotion.state = ACPI_STATE_C3;
+
+ pr->power.states[ACPI_STATE_C3].demotion.threshold.count = 1;
+ pr->power.states[ACPI_STATE_C3].demotion.threshold.ticks =
+ pr->power.states[ACPI_STATE_C3].latency_ticks;
+ pr->power.states[ACPI_STATE_C3].demotion.threshold.bm = 0x0F;
+ pr->power.states[ACPI_STATE_C3].demotion.state = ACPI_STATE_C2;
+ }
+
+ return_VALUE(0);
+}
+
+
+int
+acpi_processor_get_power_info (
+ struct acpi_processor *pr)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_power_info");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "lvl2[0x%08x] lvl3[0x%08x]\n",
+ pr->power.states[ACPI_STATE_C2].address,
+ pr->power.states[ACPI_STATE_C3].address));
+
+ /* TBD: Support ACPI 2.0 objects */
+
+ /*
+ * C0
+ * --
+ * This state exists only as filler in our array.
+ */
+ pr->power.states[ACPI_STATE_C0].valid = 1;
+
+ /*
+ * C1
+ * --
+ * ACPI requires C1 support for all processors.
+ *
+ * TBD: What about PROC_C1?
+ */
+ pr->power.states[ACPI_STATE_C1].valid = 1;
+
+ /*
+ * C2
+ * --
+ * We're (currently) only supporting C2 on UP systems.
+ *
+ * TBD: Support for C2 on MP (P_LVL2_UP).
+ */
+ if (pr->power.states[ACPI_STATE_C2].address) {
+
+ pr->power.states[ACPI_STATE_C2].latency = acpi_fadt.plvl2_lat;
+
+ /*
+ * C2 latency must be less than or equal to 100 microseconds.
+ */
+ if (acpi_fadt.plvl2_lat > ACPI_PROCESSOR_MAX_C2_LATENCY)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C2 latency too large [%d]\n",
+ acpi_fadt.plvl2_lat));
+ /*
+ * Only support C2 on UP systems (see TBD above).
+ */
+ else if (errata.smp)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C2 not supported in SMP mode\n"));
+ /*
+ * Otherwise we've met all of our C2 requirements.
+ * Normalize the C2 latency to expidite policy.
+ */
+ else {
+ pr->power.states[ACPI_STATE_C2].valid = 1;
+ pr->power.states[ACPI_STATE_C2].latency_ticks =
+ US_TO_PM_TIMER_TICKS(acpi_fadt.plvl2_lat);
+ }
+ }
+
+ /*
+ * C3
+ * --
+ * TBD: Investigate use of WBINVD on UP/SMP system in absence of
+ * bm_control.
+ */
+ if (pr->power.states[ACPI_STATE_C3].address) {
+
+ pr->power.states[ACPI_STATE_C3].latency = acpi_fadt.plvl3_lat;
+
+ /*
+ * C3 latency must be less than or equal to 1000 microseconds.
+ */
+ if (acpi_fadt.plvl3_lat > ACPI_PROCESSOR_MAX_C3_LATENCY)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 latency too large [%d]\n",
+ acpi_fadt.plvl3_lat));
+ /*
+ * Only support C3 when bus mastering arbitration control
+ * is present (able to disable bus mastering to maintain
+ * cache coherency while in C3).
+ */
+ else if (!pr->flags.bm_control)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 support requires bus mastering control\n"));
+ /*
+ * Only support C3 on UP systems, as bm_control is only viable
+ * on a UP system and flushing caches (e.g. WBINVD) is simply
+ * too costly (at this time).
+ */
+ else if (errata.smp)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 not supported in SMP mode\n"));
+ /*
+ * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
+ * DMA transfers are used by any ISA device to avoid livelock.
+ * Note that we could disable Type-F DMA (as recommended by
+ * the erratum), but this is known to disrupt certain ISA
+ * devices thus we take the conservative approach.
+ */
+ else if (errata.piix4.fdma) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 not supported on PIIX4 with Type-F DMA\n"));
+ }
+ /*
+ * Otherwise we've met all of our C3 requirements.
+ * Normalize the C2 latency to expidite policy. Enable
+ * checking of bus mastering status (bm_check) so we can
+ * use this in our C3 policy.
+ */
+ else {
+ pr->power.states[ACPI_STATE_C3].valid = 1;
+ pr->power.states[ACPI_STATE_C3].latency_ticks =
+ US_TO_PM_TIMER_TICKS(acpi_fadt.plvl3_lat);
+ pr->flags.bm_check = 1;
+ }
+ }
+
+ /*
+ * 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).
+ */
+ result = acpi_processor_set_power_policy(pr);
+ if (result)
+ return_VALUE(result);
+
+ /*
+ * If this processor supports C2 or C3 we denote it as being 'power
+ * manageable'. Note that there's really no policy involved for
+ * when only C1 is supported.
+ */
+ if (pr->power.states[ACPI_STATE_C2].valid
+ || pr->power.states[ACPI_STATE_C3].valid)
+ pr->flags.power = 1;
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Performance Management
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_get_platform_limit (
+ struct acpi_processor* pr)
+{
+ acpi_status status = 0;
+ unsigned long ppc = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ /*
+ * _PPC indicates the maximum state currently supported by the platform
+ * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
+ */
+ status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
+ if(ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ pr->performance.platform_limit = (int) ppc;
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_processor_get_performance_control (
+ struct acpi_processor *pr)
+{
+ int result = 0;
+ acpi_status status = 0;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *pct = NULL;
+ union acpi_object obj = {0};
+ struct acpi_pct_register *reg = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
+
+ status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
+ if(ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ pct = (union acpi_object *) buffer.pointer;
+ if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
+ || (pct->package.count != 2)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
+ result = -EFAULT;
+ goto end;
+ }
+
+ /*
+ * control_register
+ */
+
+ obj = pct->package.elements[0];
+
+ if ((obj.type != ACPI_TYPE_BUFFER)
+ || (obj.buffer.length < sizeof(struct acpi_pct_register))
+ || (obj.buffer.pointer == NULL)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Invalid _PCT data (control_register)\n"));
+ result = -EFAULT;
+ goto end;
+ }
+
+ reg = (struct acpi_pct_register *) (obj.buffer.pointer);
+
+ if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unsupported address space [%d] (control_register)\n",
+ (u32) reg->space_id));
+ result = -EFAULT;
+ goto end;
+ }
+
+ pr->performance.control_register = (u16) reg->address;
+
+ /*
+ * status_register
+ */
+
+ obj = pct->package.elements[1];
+
+ if ((obj.type != ACPI_TYPE_BUFFER)
+ || (obj.buffer.length < sizeof(struct acpi_pct_register))
+ || (obj.buffer.pointer == NULL)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Invalid _PCT data (status_register)\n"));
+ result = -EFAULT;
+ goto end;
+ }
+
+ reg = (struct acpi_pct_register *) (obj.buffer.pointer);
+
+ if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unsupported address space [%d] (status_register)\n",
+ (u32) reg->space_id));
+ result = -EFAULT;
+ goto end;
+ }
+
+ pr->performance.status_register = (u16) reg->address;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "control_register[0x%04x] status_register[0x%04x]\n",
+ pr->performance.control_register,
+ pr->performance.status_register));
+
+end:
+ acpi_os_free(buffer.pointer);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_processor_get_performance_states (
+ struct acpi_processor* pr)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_buffer format = {sizeof("NNNNNN"), "NNNNNN"};
+ struct acpi_buffer state = {0, NULL};
+ union acpi_object *pss = NULL;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
+
+ status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
+ if(ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ pss = (union acpi_object *) buffer.pointer;
+ if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+ result = -EFAULT;
+ goto end;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
+ pss->package.count));
+
+ if (pss->package.count > ACPI_PROCESSOR_MAX_PERFORMANCE) {
+ pr->performance.state_count = ACPI_PROCESSOR_MAX_PERFORMANCE;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Limiting number of states to max (%d)\n",
+ ACPI_PROCESSOR_MAX_PERFORMANCE));
+ }
+ else
+ pr->performance.state_count = pss->package.count;
+
+ if (pr->performance.state_count > 1)
+ pr->flags.performance = 1;
+
+ for (i = 0; i < pr->performance.state_count; i++) {
+
+ struct acpi_processor_px *px = &(pr->performance.states[i]);
+
+ state.length = sizeof(struct acpi_processor_px);
+ state.pointer = px;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
+
+ status = acpi_extract_package(&(pss->package.elements[i]),
+ &format, &state);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+ result = -EFAULT;
+ goto end;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
+ i,
+ (u32) px->core_frequency,
+ (u32) px->power,
+ (u32) px->transition_latency,
+ (u32) px->bus_master_latency,
+ (u32) px->control,
+ (u32) px->status));
+ }
+
+end:
+ acpi_os_free(buffer.pointer);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_processor_set_performance (
+ struct acpi_processor *pr,
+ int state)
+{
+ u16 port = 0;
+ u8 value = 0;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_set_performance");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if (!pr->flags.performance)
+ return_VALUE(-ENODEV);
+
+ if (state >= pr->performance.state_count) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Invalid target state (P%d)\n", state));
+ return_VALUE(-ENODEV);
+ }
+
+ if (state < pr->performance.platform_limit) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Platform limit (P%d) overrides target state (P%d)\n",
+ pr->performance.platform_limit, state));
+ return_VALUE(-ENODEV);
+ }
+
+ if (state == pr->performance.state) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Already at target state (P%d)\n", state));
+ return_VALUE(0);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Transitioning from P%d to P%d\n",
+ pr->performance.state, state));
+
+ /*
+ * First we write the target state's 'control' value to the
+ * control_register.
+ */
+
+ port = pr->performance.control_register;
+ value = (u16) pr->performance.states[state].control;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Writing 0x%02x to port 0x%04x\n", value, port));
+
+ outb(value, port);
+
+ /*
+ * Then we read the 'status_register' and compare the value with the
+ * target state's 'status' to make sure the transition was successful.
+ * Note that we'll poll for up to 1ms (100 cycles of 10us) before
+ * giving up.
+ */
+
+ port = pr->performance.status_register;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Looking for 0x%02x from port 0x%04x\n",
+ (u8) pr->performance.states[state].status, port));
+
+ for (i=0; i<100; i++) {
+ value = inb(port);
+ if (value == (u8) pr->performance.states[state].status)
+ break;
+ udelay(10);
+ }
+
+ if (value != pr->performance.states[state].status) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Transition failed\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Transition successful after %d microseconds\n",
+ i * 10));
+
+ pr->performance.state = state;
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_processor_get_performance_info (
+ struct acpi_processor *pr)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ acpi_handle handle = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ status = acpi_get_handle(pr->handle, "_PCT", &handle);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "ACPI-based processor performance control unavailable\n"));
+ return_VALUE(0);
+ }
+
+ result = acpi_processor_get_performance_control(pr);
+ if (result)
+ return_VALUE(result);
+
+ result = acpi_processor_get_performance_states(pr);
+ if (result)
+ return_VALUE(result);
+
+ result = acpi_processor_get_platform_limit(pr);
+ if (result)
+ return_VALUE(result);
+
+ /*
+ * TBD: Don't trust the latency values we get from BIOS, but rather
+ * measure the latencies during run-time (e.g. get_latencies).
+ */
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Throttling Control
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_get_throttling (
+ struct acpi_processor *pr)
+{
+ int state = 0;
+ u32 value = 0;
+ u32 duty_mask = 0;
+ u32 duty_value = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_throttling");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if (!pr->flags.throttling)
+ return_VALUE(-ENODEV);
+
+ pr->throttling.state = 0;
+
+ __cli();
+
+ duty_mask = pr->throttling.state_count - 1;
+
+ duty_mask <<= pr->throttling.duty_offset;
+
+ value = inl(pr->throttling.address);
+
+ /*
+ * Compute the current throttling state when throttling is enabled
+ * (bit 4 is on).
+ */
+ if (value & 0x10) {
+ duty_value = value & duty_mask;
+ duty_value >>= pr->throttling.duty_offset;
+
+ if (duty_value)
+ state = pr->throttling.state_count-duty_value;
+ }
+
+ pr->throttling.state = state;
+
+ __sti();
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Throttling state is T%d (%d%% throttling applied)\n",
+ state, pr->throttling.states[state].performance));
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_processor_set_throttling (
+ struct acpi_processor *pr,
+ int state)
+{
+ u32 value = 0;
+ u32 duty_mask = 0;
+ u32 duty_value = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_set_throttling");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if ((state < 0) || (state > (pr->throttling.state_count - 1)))
+ return_VALUE(-EINVAL);
+
+ if (!pr->flags.throttling)
+ return_VALUE(-ENODEV);
+
+ if (state == pr->throttling.state)
+ return_VALUE(0);
+
+ __cli();
+
+ /*
+ * Calculate the duty_value and duty_mask.
+ */
+ if (state) {
+ duty_value = pr->throttling.state_count - state;
+
+ duty_value <<= pr->throttling.duty_offset;
+
+ /* Used to clear all duty_value bits */
+ duty_mask = pr->throttling.state_count - 1;
+
+ duty_mask <<= acpi_fadt.duty_offset;
+ duty_mask = ~duty_mask;
+ }
+
+ /*
+ * Disable throttling by writing a 0 to bit 4. Note that we must
+ * turn it off before you can change the duty_value.
+ */
+ value = inl(pr->throttling.address);
+ if (value & 0x10) {
+ value &= 0xFFFFFFEF;
+ outl(value, pr->throttling.address);
+ }
+
+ /*
+ * Write the new duty_value and then enable throttling. Note
+ * that a state value of 0 leaves throttling disabled.
+ */
+ if (state) {
+ value &= duty_mask;
+ value |= duty_value;
+ outl(value, pr->throttling.address);
+
+ value |= 0x00000010;
+ outl(value, pr->throttling.address);
+ }
+
+ pr->throttling.state = state;
+
+ __sti();
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Throttling state set to T%d (%d%%)\n", state,
+ (pr->throttling.states[state].performance?pr->throttling.states[state].performance/10:0)));
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_processor_get_throttling_info (
+ struct acpi_processor *pr)
+{
+ int result = 0;
+ int step = 0;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_throttling_info");
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
+ pr->throttling.address,
+ pr->throttling.duty_offset,
+ pr->throttling.duty_width));
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ /* TBD: Support ACPI 2.0 objects */
+
+ if (!pr->throttling.address) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
+ return_VALUE(0);
+ }
+ else if (!pr->throttling.duty_width) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
+ return_VALUE(0);
+ }
+ /* TBD: Support duty_cycle values that span bit 4. */
+ else if ((pr->throttling.duty_offset
+ + pr->throttling.duty_width) > 4) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "duty_cycle spans bit 4\n"));
+ return_VALUE(0);
+ }
+
+ /*
+ * PIIX4 Errata: We don't support throttling on the original PIIX4.
+ * This shouldn't be an issue as few (if any) mobile systems ever
+ * used this part.
+ */
+ if (errata.piix4.throttle) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Throttling not supported on PIIX4 A- or B-step\n"));
+ return_VALUE(0);
+ }
+
+ pr->throttling.state_count = POWER_OF_2[acpi_fadt.duty_width];
+
+ /*
+ * Compute state values. Note that throttling displays a linear power/
+ * performance relationship (at 50% performance the CPU will consume
+ * 50% power). Values are in 1/10th of a percent to preserve accuracy.
+ */
+
+ step = (1000 / pr->throttling.state_count);
+
+ for (i=0; i<pr->throttling.state_count; i++) {
+ pr->throttling.states[i].performance = step * i;
+ pr->throttling.states[i].power = step * i;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
+ pr->throttling.state_count));
+
+ pr->flags.throttling = 1;
+
+ /*
+ * Disable throttling (if enabled). We'll let subsequent policy (e.g.
+ * thermal) decide to lower performance if it so chooses, but for now
+ * we'll crank up the speed.
+ */
+
+ result = acpi_processor_get_throttling(pr);
+ if (result)
+ goto end;
+
+ if (pr->throttling.state) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabling throttling (was T%d)\n",
+ pr->throttling.state));
+ result = acpi_processor_set_throttling(pr, 0);
+ if (result)
+ goto end;
+ }
+
+end:
+ if (result)
+ pr->flags.throttling = 0;
+
+ return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+ Limit Interface
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_apply_limit (
+ struct acpi_processor* pr)
+{
+ int result = 0;
+ u16 px = 0;
+ u16 tx = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if (!pr->flags.limit)
+ return_VALUE(-ENODEV);
+
+ if (pr->flags.performance) {
+ px = pr->performance.platform_limit;
+ if (pr->limit.user.px > px)
+ px = pr->limit.user.px;
+ if (pr->limit.thermal.px > px)
+ px = pr->limit.thermal.px;
+
+ result = acpi_processor_set_performance(pr, px);
+ if (result)
+ goto end;
+ }
+
+ if (pr->flags.throttling) {
+ if (pr->limit.user.tx > tx)
+ tx = pr->limit.user.tx;
+ if (pr->limit.thermal.tx > tx)
+ tx = pr->limit.thermal.tx;
+
+ result = acpi_processor_set_throttling(pr, tx);
+ if (result)
+ goto end;
+ }
+
+ pr->limit.state.px = px;
+ pr->limit.state.tx = tx;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d] limit set to (P%d:T%d)\n",
+ pr->id,
+ pr->limit.state.px,
+ pr->limit.state.tx));
+
+end:
+ if (result)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));
+
+ return_VALUE(result);
+}
+
+
+int
+acpi_processor_set_thermal_limit (
+ acpi_handle handle,
+ int type)
+{
+ int result = 0;
+ struct acpi_processor *pr = NULL;
+ struct acpi_device *device = NULL;
+ int px = 0;
+ int tx = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
+
+ if ((type < ACPI_PROCESSOR_LIMIT_NONE)
+ || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
+ return_VALUE(-EINVAL);
+
+ result = acpi_bus_get_device(handle, &device);
+ if (result)
+ return_VALUE(result);
+
+ pr = (struct acpi_processor *) acpi_driver_data(device);
+ if (!pr)
+ return_VALUE(-ENODEV);
+
+ if (!pr->flags.limit)
+ return_VALUE(-ENODEV);
+
+ /* Thermal limits are always relative to the current Px/Tx state. */
+ if (pr->flags.performance)
+ pr->limit.thermal.px = pr->performance.state;
+ if (pr->flags.throttling)
+ pr->limit.thermal.tx = pr->throttling.state;
+
+ /*
+ * Our default policy is to only use throttling at the lowest
+ * performance state.
+ */
+
+ px = pr->limit.thermal.px;
+ tx = pr->limit.thermal.tx;
+
+ switch (type) {
+
+ case ACPI_PROCESSOR_LIMIT_NONE:
+ px = 0;
+ tx = 0;
+ break;
+
+ case ACPI_PROCESSOR_LIMIT_INCREMENT:
+ if (pr->flags.performance) {
+ if (px == (pr->performance.state_count - 1))
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "At maximum performance state\n"));
+ else {
+ px++;
+ goto end;
+ }
+ }
+ if (pr->flags.throttling) {
+ if (tx == (pr->throttling.state_count - 1))
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "At maximum throttling state\n"));
+ else
+ tx++;
+ }
+ break;
+
+ case ACPI_PROCESSOR_LIMIT_DECREMENT:
+ if (pr->flags.performance) {
+ if (px == pr->performance.platform_limit)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "At minimum performance state\n"));
+ else {
+ px--;
+ goto end;
+ }
+ }
+ if (pr->flags.throttling) {
+ if (tx == 0)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "At minimum throttling state\n"));
+ else
+ tx--;
+ }
+ break;
+ }
+
+end:
+ pr->limit.thermal.px = px;
+ pr->limit.thermal.tx = tx;
+
+ result = acpi_processor_apply_limit(pr);
+ if (result)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to set thermal limit\n"));
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
+ pr->limit.thermal.px,
+ pr->limit.thermal.tx));
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_processor_get_limit_info (
+ struct acpi_processor *pr)
+{
+ ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+ if (pr->flags.performance || pr->flags.throttling)
+ pr->flags.limit = 1;
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ FS Interface (/proc)
+ -------------------------------------------------------------------------- */
+
+struct proc_dir_entry *acpi_processor_dir = NULL;
+
+static int
+acpi_processor_read_info (
+ char *page,
+ char **start,
+ off_t off,
+ int count,
+ int *eof,
+ void *data)
+{
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char *p = page;
+ int len = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_read_info");
+
+ if (!pr || (off != 0))
+ goto end;
+
+ p += sprintf(p, "processor id: %d\n",
+ pr->id);
+
+ p += sprintf(p, "acpi id: %d\n",
+ pr->acpi_id);
+
+ p += sprintf(p, "bus mastering control: %s\n",
+ pr->flags.bm_control ? "yes" : "no");
+
+ p += sprintf(p, "power management: %s\n",
+ pr->flags.power ? "yes" : "no");
+
+ p += sprintf(p, "throttling control: %s\n",
+ pr->flags.throttling ? "yes" : "no");
+
+ p += sprintf(p, "performance management: %s\n",
+ pr->flags.performance ? "yes" : "no");
+
+ p += sprintf(p, "limit interface: %s\n",
+ pr->flags.limit ? "yes" : "no");
+
+end:
+ len = (p - page);
+ if (len <= off+count) *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len>count) len = count;
+ if (len<0) len = 0;
+
+ return_VALUE(len);
+}
+
+
+static int
+acpi_processor_read_power (
+ char *page,
+ char **start,
+ off_t off,
+ int count,
+ int *eof,
+ void *data)
+{
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char *p = page;
+ int len = 0;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_read_power");
+
+ if (!pr || (off != 0))
+ goto end;
+
+ p += sprintf(p, "active state: C%d\n",
+ pr->power.state);
+
+ p += sprintf(p, "default state: C%d\n",
+ pr->power.default_state);
+
+ p += sprintf(p, "bus master activity: %08x\n",
+ pr->power.bm_activity);
+
+ p += sprintf(p, "states:\n");
+
+ for (i=1; i<ACPI_C_STATE_COUNT; i++) {
+
+ p += sprintf(p, " %cC%d: ",
+ (i == pr->power.state?'*':' '), i);
+
+ if (!pr->power.states[i].valid) {
+ p += sprintf(p, "<not supported>\n");
+ continue;
+ }
+
+ if (pr->power.states[i].promotion.state)
+ p += sprintf(p, "promotion[C%d] ",
+ pr->power.states[i].promotion.state);
+ else
+ p += sprintf(p, "promotion[--] ");
+
+ if (pr->power.states[i].demotion.state)
+ p += sprintf(p, "demotion[C%d] ",
+ pr->power.states[i].demotion.state);
+ else
+ p += sprintf(p, "demotion[--] ");
+
+ p += sprintf(p, "latency[%03d] usage[%08d]\n",
+ pr->power.states[i].latency,
+ pr->power.states[i].usage);
+ }
+
+end:
+ len = (p - page);
+ if (len <= off+count) *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len>count) len = count;
+ if (len<0) len = 0;
+
+ return_VALUE(len);
+}
+
+
+static int
+acpi_processor_read_performance (
+ char *page,
+ char **start,
+ off_t off,
+ int count,
+ int *eof,
+ void *data)
+{
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char *p = page;
+ int len = 0;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_read_performance");
+
+ if (!pr || (off != 0))
+ goto end;
+
+ if (!pr->flags.performance) {
+ p += sprintf(p, "<not supported>\n");
+ goto end;
+ }
+
+ p += sprintf(p, "state count: %d\n",
+ pr->performance.state_count);
+
+ p += sprintf(p, "active state: P%d\n",
+ pr->performance.state);
+
+ p += sprintf(p, "states:\n");
+
+ for (i=0; i<pr->performance.state_count; i++)
+ p += sprintf(p, " %cP%d: %d MHz, %d mW, %d uS\n",
+ (i == pr->performance.state?'*':' '), i,
+ (u32) pr->performance.states[i].core_frequency,
+ (u32) pr->performance.states[i].power,
+ (u32) pr->performance.states[i].transition_latency);
+
+end:
+ len = (p - page);
+ if (len <= off+count) *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len>count) len = count;
+ if (len<0) len = 0;
+
+ return_VALUE(len);
+}
+
+
+static int
+acpi_processor_write_performance (
+ struct file *file,
+ const char *buffer,
+ unsigned long count,
+ void *data)
+{
+ int result = 0;
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char state_string[12] = {'\0'};
+
+ ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
+
+ if (!pr || (count > sizeof(state_string) - 1))
+ return_VALUE(-EINVAL);
+
+ if (copy_from_user(state_string, buffer, count))
+ return_VALUE(-EFAULT);
+
+ state_string[count] = '\0';
+
+ result = acpi_processor_set_performance(pr,
+ simple_strtoul(state_string, NULL, 0));
+ if (result)
+ return_VALUE(result);
+
+ return_VALUE(count);
+}
+
+
+static int
+acpi_processor_read_throttling (
+ char *page,
+ char **start,
+ off_t off,
+ int count,
+ int *eof,
+ void *data)
+{
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char *p = page;
+ int len = 0;
+ int i = 0;
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_read_throttling");
+
+ if (!pr || (off != 0))
+ goto end;
+
+ if (!(pr->throttling.state_count > 0)) {
+ p += sprintf(p, "<not supported>\n");
+ goto end;
+ }
+
+ result = acpi_processor_get_throttling(pr);
+
+ if (result) {
+ p += sprintf(p, "Could not determine current throttling state.\n");
+ goto end;
+ }
+
+ p += sprintf(p, "state count: %d\n",
+ pr->throttling.state_count);
+
+ p += sprintf(p, "active state: T%d\n",
+ pr->throttling.state);
+
+ p += sprintf(p, "states:\n");
+
+ for (i=0; i<pr->throttling.state_count; i++)
+ p += sprintf(p, " %cT%d: %02d%%\n",
+ (i == pr->throttling.state?'*':' '), i,
+ (pr->throttling.states[i].performance?pr->throttling.states[i].performance/10:0));
+
+end:
+ len = (p - page);
+ if (len <= off+count) *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len>count) len = count;
+ if (len<0) len = 0;
+
+ return_VALUE(len);
+}
+
+
+static int
+acpi_processor_write_throttling (
+ struct file *file,
+ const char *buffer,
+ unsigned long count,
+ void *data)
+{
+ int result = 0;
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char state_string[12] = {'\0'};
+
+ ACPI_FUNCTION_TRACE("acpi_processor_write_throttling");
+
+ if (!pr || (count > sizeof(state_string) - 1))
+ return_VALUE(-EINVAL);
+
+ if (copy_from_user(state_string, buffer, count))
+ return_VALUE(-EFAULT);
+
+ state_string[count] = '\0';
+
+ result = acpi_processor_set_throttling(pr,
+ simple_strtoul(state_string, NULL, 0));
+ if (result)
+ return_VALUE(result);
+
+ return_VALUE(count);
+}
+
+
+static int
+acpi_processor_read_limit (
+ char *page,
+ char **start,
+ off_t off,
+ int count,
+ int *eof,
+ void *data)
+{
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char *p = page;
+ int len = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_read_limit");
+
+ if (!pr || (off != 0))
+ goto end;
+
+ if (!pr->flags.limit) {
+ p += sprintf(p, "<not supported>\n");
+ goto end;
+ }
+
+ p += sprintf(p, "active limit: P%d:T%d\n",
+ pr->limit.state.px, pr->limit.state.tx);
+
+ p += sprintf(p, "platform limit: P%d:T0\n",
+ pr->flags.performance?pr->performance.platform_limit:0);
+
+ p += sprintf(p, "user limit: P%d:T%d\n",
+ pr->limit.user.px, pr->limit.user.tx);
+
+ p += sprintf(p, "thermal limit: P%d:T%d\n",
+ pr->limit.thermal.px, pr->limit.thermal.tx);
+
+end:
+ len = (p - page);
+ if (len <= off+count) *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len>count) len = count;
+ if (len<0) len = 0;
+
+ return_VALUE(len);
+}
+
+
+static int
+acpi_processor_write_limit (
+ struct file *file,
+ const char *buffer,
+ unsigned long count,
+ void *data)
+{
+ int result = 0;
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ char limit_string[25] = {'\0'};
+ int px = 0;
+ int tx = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
+
+ if (!pr || (count > sizeof(limit_string) - 1)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
+ return_VALUE(-EINVAL);
+ }
+
+ if (copy_from_user(limit_string, buffer, count)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
+ return_VALUE(-EFAULT);
+ }
+
+ limit_string[count] = '\0';
+
+ if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
+ return_VALUE(-EINVAL);
+ }
+
+ if (pr->flags.performance) {
+ if ((px < pr->performance.platform_limit)
+ || (px > (pr->performance.state_count - 1))) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid px\n"));
+ return_VALUE(-EINVAL);
+ }
+ pr->limit.user.px = px;
+ }
+
+ if (pr->flags.throttling) {
+ if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
+ return_VALUE(-EINVAL);
+ }
+ pr->limit.user.tx = tx;
+ }
+
+ result = acpi_processor_apply_limit(pr);
+
+ return_VALUE(count);
+}
+
+
+static int
+acpi_processor_add_fs (
+ struct acpi_device *device)
+{
+ struct proc_dir_entry *entry = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
+
+ if (!acpi_device_dir(device)) {
+ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+ acpi_processor_dir);
+ if (!acpi_device_dir(device))
+ return_VALUE(-ENODEV);
+ }
+
+ /* 'info' [R] */
+ entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
+ S_IRUGO, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_PROCESSOR_FILE_INFO));
+ else {
+ entry->read_proc = acpi_processor_read_info;
+ entry->data = acpi_driver_data(device);
+ }
+
+ /* 'power' [R] */
+ entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER,
+ 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));
+ else {
+ entry->read_proc = acpi_processor_read_power;
+ entry->data = acpi_driver_data(device);
+ }
+
+ /* 'performance' [R/W] */
+ entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
+ S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_PROCESSOR_FILE_PERFORMANCE));
+ else {
+ entry->read_proc = acpi_processor_read_performance;
+ entry->write_proc = acpi_processor_write_performance;
+ entry->data = acpi_driver_data(device);
+ }
+
+ /* 'throttling' [R/W] */
+ entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
+ S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_PROCESSOR_FILE_THROTTLING));
+ else {
+ entry->read_proc = acpi_processor_read_throttling;
+ entry->write_proc = acpi_processor_write_throttling;
+ entry->data = acpi_driver_data(device);
+ }
+
+ /* 'limit' [R/W] */
+ entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
+ S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_PROCESSOR_FILE_LIMIT));
+ else {
+ entry->read_proc = acpi_processor_read_limit;
+ entry->write_proc = acpi_processor_write_limit;
+ entry->data = acpi_driver_data(device);
+ }
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_processor_remove_fs (
+ struct acpi_device *device)
+{
+ ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
+
+ if (acpi_device_dir(device)) {
+ remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
+ acpi_device_dir(device) = NULL;
+ }
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_processor_get_info (
+ struct acpi_processor *pr)
+{
+ acpi_status status = 0;
+ union acpi_object object = {0};
+ struct acpi_buffer buffer = {sizeof(union acpi_object), &object};
+ static int cpu_index = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_info");
+
+ if (!pr)
+ return_VALUE(-EINVAL);
+
+#ifdef CONFIG_SMP
+ if (smp_num_cpus > 1)
+ errata.smp = smp_num_cpus;
+
+ /*
+ * Extra Processor objects may be enumerated on MP systems with
+ * less than the max # of CPUs. They should be ignored.
+ */
+ if ((cpu_index + 1) > smp_num_cpus)
+ return_VALUE(-ENODEV);
+#endif
+
+ acpi_processor_errata(pr);
+
+ /*
+ * Check to see if we have bus mastering arbitration control. This
+ * is required for proper C3 usage (to maintain cache coherency).
+ */
+ if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) {
+ pr->flags.bm_control = 1;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Bus mastering arbitration control present\n"));
+ }
+ else
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No bus mastering arbitration control\n"));
+
+ /*
+ * Evalute the processor object. Note that it is common on SMP to
+ * have the first (boot) processor with a valid PBLK address while
+ * all others have a NULL address.
+ */
+ status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error evaluating processor object\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ /*
+ * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
+ * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
+ */
+ pr->id = cpu_index++;
+ pr->acpi_id = object.processor.proc_id;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
+ pr->acpi_id));
+
+ if (!object.processor.pblk_address)
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
+ else if (object.processor.pblk_length != 6)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n",
+ object.processor.pblk_length));
+ else {
+ pr->throttling.address = object.processor.pblk_address;
+ pr->throttling.duty_offset = acpi_fadt.duty_offset;
+ pr->throttling.duty_width = acpi_fadt.duty_width;
+ pr->power.states[ACPI_STATE_C2].address =
+ object.processor.pblk_address + 4;
+ pr->power.states[ACPI_STATE_C3].address =
+ object.processor.pblk_address + 5;
+ }
+
+ acpi_processor_get_power_info(pr);
+ acpi_processor_get_performance_info(pr);
+ acpi_processor_get_throttling_info(pr);
+ acpi_processor_get_limit_info(pr);
+
+ return_VALUE(0);
+}
+
+
+static void
+acpi_processor_notify (
+ acpi_handle handle,
+ u32 event,
+ void *data)
+{
+ int result = 0;
+ struct acpi_processor *pr = (struct acpi_processor *) data;
+ struct acpi_device *device = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_notify");
+
+ if (!pr)
+ return_VOID;
+
+ if (acpi_bus_get_device(pr->handle, &device))
+ return_VOID;
+
+ switch (event) {
+ case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
+ result = acpi_processor_get_platform_limit(pr);
+ if (!result)
+ acpi_processor_apply_limit(pr);
+
+ acpi_bus_generate_event(device, event,
+ pr->performance.platform_limit);
+ break;
+ case ACPI_PROCESSOR_NOTIFY_POWER:
+ /* TBD */
+ acpi_bus_generate_event(device, event, 0);
+ break;
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Unsupported event [0x%x]\n", event));
+ break;
+ }
+
+ return_VOID;
+}
+
+
+static int
+acpi_processor_add (
+ struct acpi_device *device)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_processor *pr = NULL;
+ u32 i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_add");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
+ if (!pr)
+ return_VALUE(-ENOMEM);
+ memset(pr, 0, sizeof(struct acpi_processor));
+
+ pr->handle = device->handle;
+ sprintf(acpi_device_name(device), "%s", ACPI_PROCESSOR_DEVICE_NAME);
+ sprintf(acpi_device_class(device), "%s", ACPI_PROCESSOR_CLASS);
+ acpi_driver_data(device) = pr;
+
+ result = acpi_processor_get_info(pr);
+ if (result)
+ goto end;
+
+ result = acpi_processor_add_fs(device);
+ if (result)
+ goto end;
+
+ status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
+ acpi_processor_notify, pr);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error installing notify handler\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ processors[pr->id] = pr;
+
+ /*
+ * Install the idle handler if processor power management is supported.
+ * Note that the default idle handler (default_idle) will be used on
+ * platforms that only support C1.
+ */
+ if ((pr->id == 0) && (pr->flags.power)) {
+ pm_idle_save = pm_idle;
+ pm_idle = acpi_processor_idle;
+ }
+
+ printk(KERN_INFO PREFIX "%s [%s] (supports",
+ acpi_device_name(device), acpi_device_bid(device));
+ for (i=1; i<ACPI_C_STATE_COUNT; i++)
+ if (pr->power.states[i].valid)
+ printk(" C%d", i);
+ if (pr->flags.performance)
+ printk(", %d performance states", pr->performance.state_count);
+ if (pr->flags.throttling)
+ printk(", %d throttling states", pr->throttling.state_count);
+ printk(")\n");
+
+end:
+ if (result) {
+ acpi_processor_remove_fs(device);
+ kfree(pr);
+ }
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_processor_remove (
+ struct acpi_device *device,
+ int type)
+{
+ acpi_status status = AE_OK;
+ struct acpi_processor *pr = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_remove");
+
+ if (!device || !acpi_driver_data(device))
+ return_VALUE(-EINVAL);
+
+ pr = (struct acpi_processor *) acpi_driver_data(device);
+
+ /* Unregister the idle handler when processor #0 is removed. */
+ if (pr->id == 0)
+ pm_idle = pm_idle_save;
+
+ status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
+ acpi_processor_notify);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error removing notify handler\n"));
+ }
+
+ acpi_processor_remove_fs(device);
+
+ processors[pr->id] = NULL;
+
+ kfree(pr);
+
+ return_VALUE(0);
+}
+
+
+static int __init
+acpi_processor_init (void)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_init");
+
+ memset(&processors, 0, sizeof(processors));
+ memset(&errata, 0, sizeof(errata));
+
+ acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+ if (!acpi_processor_dir)
+ return_VALUE(-ENODEV);
+
+ result = acpi_bus_register_driver(&acpi_processor_driver);
+ if (result < 0) {
+ remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+ return_VALUE(-ENODEV);
+ }
+
+ return_VALUE(0);
+}
+
+
+static void __exit
+acpi_processor_exit (void)
+{
+ ACPI_FUNCTION_TRACE("acpi_processor_exit");
+
+ acpi_bus_unregister_driver(&acpi_processor_driver);
+
+ remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+
+ return_VOID;
+}
+
+
+module_init(acpi_processor_init);
+module_exit(acpi_processor_exit);
+
+EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)