/*
- * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
+ * Copyright (C) 2005 Intel Corporation
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
*
- * 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 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
- * - Added processor hotplug support
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * 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 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.
+ * Alex Chiang <achiang@hp.com>
+ * - Unified x86/ia64 implementations
+ * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ * - Added _PDC for platforms with Intel CPUs
*/
-
-#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 <linux/cpufreq.h>
-#include <linux/cpu.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
#include <linux/dmi.h>
-#include <linux/moduleparam.h>
-
-#include <asm/io.h>
-#include <asm/system.h>
-#include <asm/cpu.h>
-#include <asm/delay.h>
-#include <asm/uaccess.h>
-#include <asm/processor.h>
-#include <asm/smp.h>
-#include <asm/acpi.h>
-
-#include <acpi/acpi_bus.h>
+#include <linux/slab.h>
+
#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
-#define ACPI_PROCESSOR_COMPONENT 0x01000000
-#define ACPI_PROCESSOR_CLASS "processor"
-#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
-#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
-#define ACPI_PROCESSOR_FILE_INFO "info"
-#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
-#define ACPI_PROCESSOR_FILE_LIMIT "limit"
-#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
-#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
-
-#define ACPI_PROCESSOR_LIMIT_USER 0
-#define ACPI_PROCESSOR_LIMIT_THERMAL 1
-
-#define ACPI_STA_PRESENT 0x00000001
+#include "internal.h"
+#define PREFIX "ACPI: "
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME("acpi_processor")
-
- MODULE_AUTHOR("Paul Diefenbaugh");
-MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
-MODULE_LICENSE("GPL");
-
-static int acpi_processor_add(struct acpi_device *device);
-static int acpi_processor_start(struct acpi_device *device);
-static int acpi_processor_remove(struct acpi_device *device, int type);
-static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
-static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
-static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
-static int acpi_processor_handle_eject(struct acpi_processor *pr);
-
-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,
- .start = acpi_processor_start,
- },
-};
+ACPI_MODULE_NAME("processor_core");
-#define INSTALL_NOTIFY_HANDLER 1
-#define UNINSTALL_NOTIFY_HANDLER 2
+static int set_no_mwait(const struct dmi_system_id *id)
+{
+ printk(KERN_NOTICE PREFIX "%s detected - "
+ "disabling mwait for CPU C-states\n", id->ident);
+ idle_nomwait = 1;
+ return 0;
+}
-static struct file_operations acpi_processor_info_fops = {
- .open = acpi_processor_info_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
+ {
+ set_no_mwait, "IFL91 board", {
+ DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),
+ DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),
+ DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},
+ {
+ set_no_mwait, "Extensa 5220", {
+ DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
+ DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
+ DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
+ {},
};
-struct acpi_processor *processors[NR_CPUS];
-struct acpi_processor_errata errata;
-
-/* --------------------------------------------------------------------------
- Errata Handling
- -------------------------------------------------------------------------- */
-
-static int acpi_processor_errata_piix4(struct pci_dev *dev)
+#ifdef CONFIG_SMP
+static int map_lapic_id(struct acpi_subtable_header *entry,
+ u32 acpi_id, int *apic_id)
{
- u8 rev = 0;
- u8 value1 = 0;
- u8 value2 = 0;
-
- ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4");
-
- if (!dev)
- return_VALUE(-EINVAL);
+ struct acpi_madt_local_apic *lapic =
+ (struct acpi_madt_local_apic *)entry;
- /*
- * 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) {
+ if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
+ return 0;
- 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;
+ if (lapic->processor_id != acpi_id)
+ return 0;
- 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_get_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);
- pci_dev_put(dev);
- }
-
- /*
- * 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_get_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;
- pci_dev_put(dev);
- }
-
- 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);
+ *apic_id = lapic->id;
+ return 1;
}
-static int acpi_processor_errata(struct acpi_processor *pr)
+static int map_x2apic_id(struct acpi_subtable_header *entry,
+ int device_declaration, u32 acpi_id, int *apic_id)
{
- int result = 0;
- struct pci_dev *dev = NULL;
-
- ACPI_FUNCTION_TRACE("acpi_processor_errata");
+ struct acpi_madt_local_x2apic *apic =
+ (struct acpi_madt_local_x2apic *)entry;
- if (!pr)
- return_VALUE(-EINVAL);
+ if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
+ return 0;
- /*
- * PIIX4
- */
- dev = pci_get_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);
- pci_dev_put(dev);
+ if (device_declaration && (apic->uid == acpi_id)) {
+ *apic_id = apic->local_apic_id;
+ return 1;
}
- return_VALUE(result);
+ return 0;
}
-/* --------------------------------------------------------------------------
- Common ACPI processor fucntions
- -------------------------------------------------------------------------- */
-
-/*
- * _PDC is required for a BIOS-OS handshake for most of the newer
- * ACPI processor features.
- */
-static int acpi_processor_set_pdc(struct acpi_processor *pr)
+static int map_lsapic_id(struct acpi_subtable_header *entry,
+ int device_declaration, u32 acpi_id, int *apic_id)
{
- struct acpi_object_list *pdc_in = pr->pdc;
- acpi_status status = AE_OK;
+ struct acpi_madt_local_sapic *lsapic =
+ (struct acpi_madt_local_sapic *)entry;
- ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
+ if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
+ return 0;
- if (!pdc_in)
- return_VALUE(status);
+ if (device_declaration) {
+ if ((entry->length < 16) || (lsapic->uid != acpi_id))
+ return 0;
+ } else if (lsapic->processor_id != acpi_id)
+ return 0;
- status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
-
- if (ACPI_FAILURE(status))
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Could not evaluate _PDC, using legacy perf. control...\n"));
-
- return_VALUE(status);
+ *apic_id = (lsapic->id << 8) | lsapic->eid;
+ return 1;
}
-/* --------------------------------------------------------------------------
- FS Interface (/proc)
- -------------------------------------------------------------------------- */
-
-static struct proc_dir_entry *acpi_processor_dir = NULL;
-
-static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
+static int map_madt_entry(int type, u32 acpi_id)
{
- struct acpi_processor *pr = (struct acpi_processor *)seq->private;
-
- ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show");
-
- if (!pr)
- goto end;
-
- seq_printf(seq, "processor id: %d\n"
- "acpi id: %d\n"
- "bus mastering control: %s\n"
- "power management: %s\n"
- "throttling control: %s\n"
- "limit interface: %s\n",
- pr->id,
- pr->acpi_id,
- pr->flags.bm_control ? "yes" : "no",
- pr->flags.power ? "yes" : "no",
- pr->flags.throttling ? "yes" : "no",
- pr->flags.limit ? "yes" : "no");
-
- end:
- return_VALUE(0);
-}
+ unsigned long madt_end, entry;
+ static struct acpi_table_madt *madt;
+ static int read_madt;
+ int apic_id = -1;
+
+ if (!read_madt) {
+ if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
+ (struct acpi_table_header **)&madt)))
+ madt = NULL;
+ read_madt++;
+ }
-static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
-{
- return single_open(file, acpi_processor_info_seq_show,
- PDE(inode)->data);
+ if (!madt)
+ return apic_id;
+
+ entry = (unsigned long)madt;
+ madt_end = entry + madt->header.length;
+
+ /* Parse all entries looking for a match. */
+
+ entry += sizeof(struct acpi_table_madt);
+ while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
+ struct acpi_subtable_header *header =
+ (struct acpi_subtable_header *)entry;
+ if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
+ if (map_lapic_id(header, acpi_id, &apic_id))
+ break;
+ } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
+ if (map_x2apic_id(header, type, acpi_id, &apic_id))
+ break;
+ } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
+ if (map_lsapic_id(header, type, acpi_id, &apic_id))
+ break;
+ }
+ entry += header->length;
+ }
+ return apic_id;
}
-static int acpi_processor_add_fs(struct acpi_device *device)
+static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
- struct proc_dir_entry *entry = NULL;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ struct acpi_subtable_header *header;
+ int apic_id = -1;
- ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+ goto exit;
- 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);
- }
- acpi_device_dir(device)->owner = THIS_MODULE;
-
- /* '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->proc_fops = &acpi_processor_info_fops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
-
- /* '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->proc_fops = &acpi_processor_throttling_fops;
- entry->proc_fops->write = acpi_processor_write_throttling;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
+ if (!buffer.length || !buffer.pointer)
+ goto exit;
- /* '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->proc_fops = &acpi_processor_limit_fops;
- entry->proc_fops->write = acpi_processor_write_limit;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
+ obj = buffer.pointer;
+ if (obj->type != ACPI_TYPE_BUFFER ||
+ obj->buffer.length < sizeof(struct acpi_subtable_header)) {
+ goto exit;
}
- 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_PROCESSOR_FILE_INFO,
- acpi_device_dir(device));
- remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
- acpi_device_dir(device));
- remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
- acpi_device_dir(device));
- remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
- acpi_device_dir(device) = NULL;
+ header = (struct acpi_subtable_header *)obj->buffer.pointer;
+ if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
+ map_lapic_id(header, acpi_id, &apic_id);
+ } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
+ map_lsapic_id(header, type, acpi_id, &apic_id);
}
- return_VALUE(0);
+exit:
+ if (buffer.pointer)
+ kfree(buffer.pointer);
+ return apic_id;
}
-/* Use the acpiid in MADT to map cpus in case of SMP */
-#ifndef CONFIG_SMP
-#define convert_acpiid_to_cpu(acpi_id) (0xff)
-#else
-
-#ifdef CONFIG_IA64
-#define arch_acpiid_to_apicid ia64_acpiid_to_sapicid
-#define arch_cpu_to_apicid ia64_cpu_to_sapicid
-#define ARCH_BAD_APICID (0xffff)
-#else
-#define arch_acpiid_to_apicid x86_acpiid_to_apicid
-#define arch_cpu_to_apicid x86_cpu_to_apicid
-#define ARCH_BAD_APICID (0xff)
-#endif
-
-static u8 convert_acpiid_to_cpu(u8 acpi_id)
+int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
- u16 apic_id;
int i;
+ int apic_id = -1;
- apic_id = arch_acpiid_to_apicid[acpi_id];
- if (apic_id == ARCH_BAD_APICID)
- return -1;
+ apic_id = map_mat_entry(handle, type, acpi_id);
+ if (apic_id == -1)
+ apic_id = map_madt_entry(type, acpi_id);
+ if (apic_id == -1)
+ return apic_id;
- for (i = 0; i < NR_CPUS; i++) {
- if (arch_cpu_to_apicid[i] == apic_id)
+ for_each_possible_cpu(i) {
+ if (cpu_physical_id(i) == apic_id)
return i;
}
return -1;
}
+EXPORT_SYMBOL_GPL(acpi_get_cpuid);
#endif
-/* --------------------------------------------------------------------------
- Driver Interface
- -------------------------------------------------------------------------- */
-
-static int acpi_processor_get_info(struct acpi_processor *pr)
+static bool processor_physically_present(acpi_handle handle)
{
- acpi_status status = 0;
+ int cpuid, type;
+ u32 acpi_id;
+ acpi_status status;
+ acpi_object_type acpi_type;
+ unsigned long long tmp;
union acpi_object object = { 0 };
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
- u8 cpu_index;
- static int cpu0_initialized;
-
- ACPI_FUNCTION_TRACE("acpi_processor_get_info");
-
- if (!pr)
- return_VALUE(-EINVAL);
-
- if (num_online_cpus() > 1)
- errata.smp = TRUE;
-
- 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->acpi_id = object.processor.proc_id;
-
- cpu_index = convert_acpiid_to_cpu(pr->acpi_id);
-
- /* Handle UP system running SMP kernel, with no LAPIC in MADT */
- if (!cpu0_initialized && (cpu_index == 0xff) &&
- (num_online_cpus() == 1)) {
- cpu_index = 0;
- }
-
- cpu0_initialized = 1;
-
- pr->id = cpu_index;
-
- /*
- * Extra Processor objects may be enumerated on MP systems with
- * less than the max # of CPUs. They should be ignored _iff
- * they are physically not present.
- */
- if (cpu_index >= NR_CPUS) {
- if (ACPI_FAILURE
- (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Error getting cpuindex for acpiid 0x%x\n",
- pr->acpi_id));
- return_VALUE(-ENODEV);
- }
- }
-
- 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->pblk = object.processor.pblk_address;
-
- /*
- * We don't care about error returns - we just try to mark
- * these reserved so that nobody else is confused into thinking
- * that this region might be unused..
- *
- * (In particular, allocating the IO range for Cardbus)
- */
- request_region(pr->throttling.address, 6, "ACPI CPU throttle");
- }
-
-#ifdef CONFIG_CPU_FREQ
- acpi_processor_ppc_has_changed(pr);
-#endif
- acpi_processor_get_throttling_info(pr);
- acpi_processor_get_limit_info(pr);
-
- return_VALUE(0);
-}
-
-static int acpi_processor_start(struct acpi_device *device)
-{
- int result = 0;
- acpi_status status = AE_OK;
- struct acpi_processor *pr;
-
- ACPI_FUNCTION_TRACE("acpi_processor_start");
-
- pr = acpi_driver_data(device);
-
- result = acpi_processor_get_info(pr);
- if (result) {
- /* Processor is physically not present */
- return_VALUE(0);
- }
-
- BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
-
- processors[pr->id] = pr;
-
- 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 device notify handler\n"));
- }
-
- /* _PDC call should be done before doing anything else (if reqd.). */
- arch_acpi_processor_init_pdc(pr);
- acpi_processor_set_pdc(pr);
-
- acpi_processor_power_init(pr, device);
-
- if (pr->flags.throttling) {
- printk(KERN_INFO PREFIX "%s [%s] (supports",
- acpi_device_name(device), acpi_device_bid(device));
- printk(" %d throttling states", pr->throttling.state_count);
- printk(")\n");
- }
-
- end:
-
- return_VALUE(result);
-}
-static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
-{
- 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:
- acpi_processor_ppc_has_changed(pr);
- acpi_bus_generate_event(device, event,
- pr->performance_platform_limit);
+ status = acpi_get_type(handle, &acpi_type);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ switch (acpi_type) {
+ case ACPI_TYPE_PROCESSOR:
+ status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+ if (ACPI_FAILURE(status))
+ return false;
+ acpi_id = object.processor.proc_id;
break;
- case ACPI_PROCESSOR_NOTIFY_POWER:
- acpi_processor_cst_has_changed(pr);
- acpi_bus_generate_event(device, event, 0);
+ case ACPI_TYPE_DEVICE:
+ status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
+ if (ACPI_FAILURE(status))
+ return false;
+ acpi_id = tmp;
break;
default:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Unsupported event [0x%x]\n", event));
- break;
+ return false;
}
- return_VOID;
-}
-
-static int acpi_processor_add(struct acpi_device *device)
-{
- struct acpi_processor *pr = NULL;
-
- ACPI_FUNCTION_TRACE("acpi_processor_add");
+ type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
+ cpuid = acpi_get_cpuid(handle, type, acpi_id);
- if (!device)
- return_VALUE(-EINVAL);
+ if (cpuid == -1)
+ return false;
- pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL);
- if (!pr)
- return_VALUE(-ENOMEM);
- memset(pr, 0, sizeof(struct acpi_processor));
-
- pr->handle = device->handle;
- strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
- strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
- acpi_driver_data(device) = pr;
-
- return_VALUE(0);
+ return true;
}
-static int acpi_processor_remove(struct acpi_device *device, int type)
+static void acpi_set_pdc_bits(u32 *buf)
{
- acpi_status status = AE_OK;
- struct acpi_processor *pr = NULL;
-
- ACPI_FUNCTION_TRACE("acpi_processor_remove");
+ buf[0] = ACPI_PDC_REVISION_ID;
+ buf[1] = 1;
- if (!device || !acpi_driver_data(device))
- return_VALUE(-EINVAL);
-
- pr = (struct acpi_processor *)acpi_driver_data(device);
-
- if (pr->id >= NR_CPUS) {
- kfree(pr);
- return_VALUE(0);
- }
-
- if (type == ACPI_BUS_REMOVAL_EJECT) {
- if (acpi_processor_handle_eject(pr))
- return_VALUE(-EINVAL);
- }
-
- acpi_processor_power_exit(pr, device);
-
- 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"));
- }
+ /* Enable coordination with firmware's _TSD info */
+ buf[2] = ACPI_PDC_SMP_T_SWCOORD;
- acpi_processor_remove_fs(device);
-
- processors[pr->id] = NULL;
-
- kfree(pr);
-
- return_VALUE(0);
-}
-
-#ifdef CONFIG_ACPI_HOTPLUG_CPU
-/****************************************************************************
- * Acpi processor hotplug support *
- ****************************************************************************/
-
-static int is_processor_present(acpi_handle handle);
-
-static int is_processor_present(acpi_handle handle)
-{
- acpi_status status;
- unsigned long sta = 0;
-
- ACPI_FUNCTION_TRACE("is_processor_present");
-
- status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
- if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Processor Device is not present\n"));
- return_VALUE(0);
- }
- return_VALUE(1);
+ /* Twiddle arch-specific bits needed for _PDC */
+ arch_acpi_set_pdc_bits(buf);
}
-static
-int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
+static struct acpi_object_list *acpi_processor_alloc_pdc(void)
{
- acpi_handle phandle;
- struct acpi_device *pdev;
- struct acpi_processor *pr;
-
- ACPI_FUNCTION_TRACE("acpi_processor_device_add");
-
- if (acpi_get_parent(handle, &phandle)) {
- return_VALUE(-ENODEV);
+ struct acpi_object_list *obj_list;
+ union acpi_object *obj;
+ u32 *buf;
+
+ /* allocate and initialize pdc. It will be used later. */
+ obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
+ if (!obj_list) {
+ printk(KERN_ERR "Memory allocation error\n");
+ return NULL;
}
- if (acpi_bus_get_device(phandle, &pdev)) {
- return_VALUE(-ENODEV);
+ obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+ if (!obj) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj_list);
+ return NULL;
}
- if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
- return_VALUE(-ENODEV);
+ buf = kmalloc(12, GFP_KERNEL);
+ if (!buf) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj);
+ kfree(obj_list);
+ return NULL;
}
- acpi_bus_start(*device);
+ acpi_set_pdc_bits(buf);
- pr = acpi_driver_data(*device);
- if (!pr)
- return_VALUE(-ENODEV);
+ obj->type = ACPI_TYPE_BUFFER;
+ obj->buffer.length = 12;
+ obj->buffer.pointer = (u8 *) buf;
+ obj_list->count = 1;
+ obj_list->pointer = obj;
- if ((pr->id >= 0) && (pr->id < NR_CPUS)) {
- kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE);
- }
- return_VALUE(0);
+ return obj_list;
}
-static void
-acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data)
+/*
+ * _PDC is required for a BIOS-OS handshake for most of the newer
+ * ACPI processor features.
+ */
+static int
+acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
- struct acpi_processor *pr;
- struct acpi_device *device = NULL;
- int result;
-
- ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify");
-
- switch (event) {
- case ACPI_NOTIFY_BUS_CHECK:
- case ACPI_NOTIFY_DEVICE_CHECK:
- printk("Processor driver received %s event\n",
- (event == ACPI_NOTIFY_BUS_CHECK) ?
- "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
-
- if (!is_processor_present(handle))
- break;
-
- if (acpi_bus_get_device(handle, &device)) {
- result = acpi_processor_device_add(handle, &device);
- if (result)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to add the device\n"));
- break;
- }
-
- pr = acpi_driver_data(device);
- if (!pr) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Driver data is NULL\n"));
- break;
- }
-
- if (pr->id >= 0 && (pr->id < NR_CPUS)) {
- kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
- break;
- }
+ acpi_status status = AE_OK;
- result = acpi_processor_start(device);
- if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) {
- kobject_hotplug(&device->kobj, KOBJ_ONLINE);
- } else {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Device [%s] failed to start\n",
- acpi_device_bid(device)));
- }
- break;
- case ACPI_NOTIFY_EJECT_REQUEST:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "received ACPI_NOTIFY_EJECT_REQUEST\n"));
+ if (idle_nomwait) {
+ /*
+ * If mwait is disabled for CPU C-states, the C2C3_FFH access
+ * mode will be disabled in the parameter of _PDC object.
+ * Of course C1_FFH access mode will also be disabled.
+ */
+ union acpi_object *obj;
+ u32 *buffer = NULL;
- if (acpi_bus_get_device(handle, &device)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Device don't exist, dropping EJECT\n"));
- break;
- }
- pr = acpi_driver_data(device);
- if (!pr) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Driver data is NULL, dropping EJECT\n"));
- return_VOID;
- }
+ obj = pdc_in->pointer;
+ buffer = (u32 *)(obj->buffer.pointer);
+ buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
- if ((pr->id < NR_CPUS) && (cpu_present(pr->id)))
- kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
- break;
- default:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Unsupported event [0x%x]\n", event));
- break;
}
+ status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
- return_VOID;
-}
-
-static acpi_status
-processor_walk_namespace_cb(acpi_handle handle,
- u32 lvl, void *context, void **rv)
-{
- acpi_status status;
- int *action = context;
- acpi_object_type type = 0;
-
- status = acpi_get_type(handle, &type);
if (ACPI_FAILURE(status))
- return (AE_OK);
-
- if (type != ACPI_TYPE_PROCESSOR)
- return (AE_OK);
-
- switch (*action) {
- case INSTALL_NOTIFY_HANDLER:
- acpi_install_notify_handler(handle,
- ACPI_SYSTEM_NOTIFY,
- acpi_processor_hotplug_notify,
- NULL);
- break;
- case UNINSTALL_NOTIFY_HANDLER:
- acpi_remove_notify_handler(handle,
- ACPI_SYSTEM_NOTIFY,
- acpi_processor_hotplug_notify);
- break;
- default:
- break;
- }
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Could not evaluate _PDC, using legacy perf. control.\n"));
- return (AE_OK);
+ return status;
}
-static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
+void acpi_processor_set_pdc(acpi_handle handle)
{
- ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init");
-
- if (!is_processor_present(handle)) {
- return_VALUE(AE_ERROR);
- }
+ struct acpi_object_list *obj_list;
- if (acpi_map_lsapic(handle, p_cpu))
- return_VALUE(AE_ERROR);
+ if (arch_has_acpi_pdc() == false)
+ return;
- if (arch_register_cpu(*p_cpu)) {
- acpi_unmap_lsapic(*p_cpu);
- return_VALUE(AE_ERROR);
- }
+ obj_list = acpi_processor_alloc_pdc();
+ if (!obj_list)
+ return;
- return_VALUE(AE_OK);
-}
+ acpi_processor_eval_pdc(handle, obj_list);
-static int acpi_processor_handle_eject(struct acpi_processor *pr)
-{
- if (cpu_online(pr->id)) {
- return (-EINVAL);
- }
- arch_unregister_cpu(pr->id);
- acpi_unmap_lsapic(pr->id);
- return (0);
-}
-#else
-static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
-{
- return AE_ERROR;
-}
-static int acpi_processor_handle_eject(struct acpi_processor *pr)
-{
- return (-EINVAL);
+ kfree(obj_list->pointer->buffer.pointer);
+ kfree(obj_list->pointer);
+ kfree(obj_list);
}
-#endif
+EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
-static
-void acpi_processor_install_hotplug_notify(void)
-{
-#ifdef CONFIG_ACPI_HOTPLUG_CPU
- int action = INSTALL_NOTIFY_HANDLER;
- acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
- ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX,
- processor_walk_namespace_cb, &action, NULL);
-#endif
-}
-
-static
-void acpi_processor_uninstall_hotplug_notify(void)
-{
-#ifdef CONFIG_ACPI_HOTPLUG_CPU
- int action = UNINSTALL_NOTIFY_HANDLER;
- acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
- ACPI_ROOT_OBJECT,
- ACPI_UINT32_MAX,
- processor_walk_namespace_cb, &action, NULL);
-#endif
-}
-
-/*
- * We keep the driver loaded even when ACPI is not running.
- * This is needed for the powernow-k8 driver, that works even without
- * ACPI, but needs symbols from this driver
- */
-
-static int __init acpi_processor_init(void)
+static acpi_status
+early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
- int result = 0;
+ if (processor_physically_present(handle) == false)
+ return AE_OK;
- 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(0);
- acpi_processor_dir->owner = THIS_MODULE;
-
- result = acpi_bus_register_driver(&acpi_processor_driver);
- if (result < 0) {
- remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
- return_VALUE(0);
- }
-
- acpi_processor_install_hotplug_notify();
-
- acpi_thermal_cpufreq_init();
-
- acpi_processor_ppc_init();
-
- return_VALUE(0);
+ acpi_processor_set_pdc(handle);
+ return AE_OK;
}
-static void __exit acpi_processor_exit(void)
+void __init acpi_early_processor_set_pdc(void)
{
- ACPI_FUNCTION_TRACE("acpi_processor_exit");
-
- acpi_processor_ppc_exit();
-
- acpi_thermal_cpufreq_exit();
-
- acpi_processor_uninstall_hotplug_notify();
-
- acpi_bus_unregister_driver(&acpi_processor_driver);
-
- remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+ /*
+ * Check whether the system is DMI table. If yes, OSPM
+ * should not use mwait for CPU-states.
+ */
+ dmi_check_system(processor_idle_dmi_table);
- return_VOID;
+ acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ early_init_pdc, NULL, NULL, NULL);
}
-
-module_init(acpi_processor_init);
-module_exit(acpi_processor_exit);
-
-EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
-
-MODULE_ALIAS("processor");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff