diff options
Diffstat (limited to 'drivers/acpi/processor_driver.c')
| -rw-r--r-- | drivers/acpi/processor_driver.c | 1142 |
1 files changed, 1142 insertions, 0 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c new file mode 100644 index 00000000000..7b0f4c2a06e --- /dev/null +++ b/drivers/acpi/processor_driver.c @@ -0,0 +1,1142 @@ +/* + * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) + * + * 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. + */ + +#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 <linux/cpuidle.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 <acpi/acpi_drivers.h> +#include <acpi/processor.h> + +#define PREFIX "ACPI: " + +#define ACPI_PROCESSOR_CLASS "processor" +#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_NOTIFY_THROTTLING 0x82 + +#define ACPI_PROCESSOR_LIMIT_USER 0 +#define ACPI_PROCESSOR_LIMIT_THERMAL 1 + +#define _COMPONENT ACPI_PROCESSOR_COMPONENT +ACPI_MODULE_NAME("processor_driver"); + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI Processor Driver"); +MODULE_LICENSE("GPL"); + +static int acpi_processor_add(struct acpi_device *device); +static int acpi_processor_remove(struct acpi_device *device, int type); +#ifdef CONFIG_ACPI_PROCFS +static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); +#endif +static void acpi_processor_notify(struct acpi_device *device, u32 event); +static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); +static int acpi_processor_handle_eject(struct acpi_processor *pr); + + +static const struct acpi_device_id processor_device_ids[] = { + {ACPI_PROCESSOR_OBJECT_HID, 0}, + {"ACPI0007", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, processor_device_ids); + +static struct acpi_driver acpi_processor_driver = { + .name = "processor", + .class = ACPI_PROCESSOR_CLASS, + .ids = processor_device_ids, + .ops = { + .add = acpi_processor_add, + .remove = acpi_processor_remove, + .suspend = acpi_processor_suspend, + .resume = acpi_processor_resume, + .notify = acpi_processor_notify, + }, +}; + +#define INSTALL_NOTIFY_HANDLER 1 +#define UNINSTALL_NOTIFY_HANDLER 2 +#ifdef CONFIG_ACPI_PROCFS +static const struct file_operations acpi_processor_info_fops = { + .owner = THIS_MODULE, + .open = acpi_processor_info_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#endif + +DEFINE_PER_CPU(struct acpi_processor *, processors); +EXPORT_PER_CPU_SYMBOL(processors); + +struct acpi_processor_errata errata __read_mostly; + +/* -------------------------------------------------------------------------- + Errata Handling + -------------------------------------------------------------------------- */ + +static int acpi_processor_errata_piix4(struct pci_dev *dev) +{ + u8 value1 = 0; + u8 value2 = 0; + + + if (!dev) + return -EINVAL; + + /* + * Note that 'dev' references the PIIX4 ACPI Controller. + */ + + switch (dev->revision) { + 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 (dev->revision) { + + 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_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 0; +} + +static int acpi_processor_errata(struct acpi_processor *pr) +{ + int result = 0; + struct pci_dev *dev = NULL; + + + if (!pr) + return -EINVAL; + + /* + * 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); + } + + return result; +} + +/* -------------------------------------------------------------------------- + FS Interface (/proc) + -------------------------------------------------------------------------- */ + +#ifdef CONFIG_ACPI_PROCFS +static struct proc_dir_entry *acpi_processor_dir = NULL; + +static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset) +{ + struct acpi_processor *pr = seq->private; + + + 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 0; +} + +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); +} + +static int __cpuinit acpi_processor_add_fs(struct acpi_device *device) +{ + struct proc_dir_entry *entry = NULL; + + + if (!acpi_device_dir(device)) { + acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), + acpi_processor_dir); + if (!acpi_device_dir(device)) + return -ENODEV; + } + + /* 'info' [R] */ + entry = proc_create_data(ACPI_PROCESSOR_FILE_INFO, + S_IRUGO, acpi_device_dir(device), + &acpi_processor_info_fops, + acpi_driver_data(device)); + if (!entry) + return -EIO; + + /* 'throttling' [R/W] */ + entry = proc_create_data(ACPI_PROCESSOR_FILE_THROTTLING, + S_IFREG | S_IRUGO | S_IWUSR, + acpi_device_dir(device), + &acpi_processor_throttling_fops, + acpi_driver_data(device)); + if (!entry) + return -EIO; + + /* 'limit' [R/W] */ + entry = proc_create_data(ACPI_PROCESSOR_FILE_LIMIT, + S_IFREG | S_IRUGO | S_IWUSR, + acpi_device_dir(device), + &acpi_processor_limit_fops, + acpi_driver_data(device)); + if (!entry) + return -EIO; + return 0; +} +static int acpi_processor_remove_fs(struct acpi_device *device) +{ + + 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; + } + + return 0; +} +#else +static inline int acpi_processor_add_fs(struct acpi_device *device) +{ + return 0; +} +static inline int acpi_processor_remove_fs(struct acpi_device *device) +{ + return 0; +} +#endif + +/* Use the acpiid in MADT to map cpus in case of SMP */ + +#ifndef CONFIG_SMP +static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) { return -1; } +#else + +static struct acpi_table_madt *madt; + +static int map_lapic_id(struct acpi_subtable_header *entry, + u32 acpi_id, int *apic_id) +{ + struct acpi_madt_local_apic *lapic = + (struct acpi_madt_local_apic *)entry; + if ((lapic->lapic_flags & ACPI_MADT_ENABLED) && + lapic->processor_id == acpi_id) { + *apic_id = lapic->id; + return 1; + } + return 0; +} + +static int map_x2apic_id(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, int *apic_id) +{ + struct acpi_madt_local_x2apic *apic = + (struct acpi_madt_local_x2apic *)entry; + u32 tmp = apic->local_apic_id; + + /* Only check enabled APICs*/ + if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) + return 0; + + /* Device statement declaration type */ + if (device_declaration) { + if (apic->uid == acpi_id) + goto found; + } + + return 0; +found: + *apic_id = tmp; + return 1; +} + +static int map_lsapic_id(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, int *apic_id) +{ + struct acpi_madt_local_sapic *lsapic = + (struct acpi_madt_local_sapic *)entry; + u32 tmp = (lsapic->id << 8) | lsapic->eid; + + /* Only check enabled APICs*/ + if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) + return 0; + + /* Device statement declaration type */ + if (device_declaration) { + if (entry->length < 16) + printk(KERN_ERR PREFIX + "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n", + tmp); + else if (lsapic->uid == acpi_id) + goto found; + /* Processor statement declaration type */ + } else if (lsapic->processor_id == acpi_id) + goto found; + + return 0; +found: + *apic_id = tmp; + return 1; +} + +static int map_madt_entry(int type, u32 acpi_id) +{ + unsigned long madt_end, entry; + int apic_id = -1; + + 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 map_mat_entry(acpi_handle handle, int type, u32 acpi_id) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + struct acpi_subtable_header *header; + int apic_id = -1; + + if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) + goto exit; + + if (!buffer.length || !buffer.pointer) + goto exit; + + obj = buffer.pointer; + if (obj->type != ACPI_TYPE_BUFFER || + obj->buffer.length < sizeof(struct acpi_subtable_header)) { + goto exit; + } + + 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); + } + +exit: + if (buffer.pointer) + kfree(buffer.pointer); + return apic_id; +} + +static int get_cpu_id(acpi_handle handle, int type, u32 acpi_id) +{ + int i; + int apic_id = -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_each_possible_cpu(i) { + if (cpu_physical_id(i) == apic_id) + return i; + } + return -1; +} +#endif + +/* -------------------------------------------------------------------------- + Driver Interface + -------------------------------------------------------------------------- */ + +static int acpi_processor_get_info(struct acpi_device *device) +{ + acpi_status status = 0; + union acpi_object object = { 0 }; + struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; + struct acpi_processor *pr; + int cpu_index, device_declaration = 0; + static int cpu0_initialized; + + pr = acpi_driver_data(device); + if (!pr) + return -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_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) { + 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")); + + if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) { + /* Declared with "Processor" statement; match ProcessorID */ + status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); + if (ACPI_FAILURE(status)) { + printk(KERN_ERR PREFIX "Evaluating processor object\n"); + return -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; + } else { + /* + * Declared with "Device" statement; match _UID. + * Note that we don't handle string _UIDs yet. + */ + unsigned long long value; + status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, + NULL, &value); + if (ACPI_FAILURE(status)) { + printk(KERN_ERR PREFIX + "Evaluating processor _UID [%#x]\n", status); + return -ENODEV; + } + device_declaration = 1; + pr->acpi_id = value; + } + cpu_index = get_cpu_id(pr->handle, device_declaration, pr->acpi_id); + + /* Handle UP system running SMP kernel, with no LAPIC in MADT */ + if (!cpu0_initialized && (cpu_index == -1) && + (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 (pr->id == -1) { + if (ACPI_FAILURE + (acpi_processor_hotadd_init(pr->handle, &pr->id))) { + return -ENODEV; + } + } + /* + * On some boxes several processors use the same processor bus id. + * But they are located in different scope. For example: + * \_SB.SCK0.CPU0 + * \_SB.SCK1.CPU0 + * Rename the processor device bus id. And the new bus id will be + * generated as the following format: + * CPU+CPU ID. + */ + sprintf(acpi_device_bid(device), "CPU%X", pr->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) + printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n", + object.processor.pblk_length); + else { + pr->throttling.address = object.processor.pblk_address; + pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset; + pr->throttling.duty_width = acpi_gbl_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"); + } + + /* + * If ACPI describes a slot number for this CPU, we can use it + * ensure we get the right value in the "physical id" field + * of /proc/cpuinfo + */ + status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer); + if (ACPI_SUCCESS(status)) + arch_fix_phys_package_id(pr->id, object.integer.value); + + return 0; +} + +static DEFINE_PER_CPU(void *, processor_device_array); + +static void acpi_processor_notify(struct acpi_device *device, u32 event) +{ + struct acpi_processor *pr = acpi_driver_data(device); + int saved; + + if (!pr) + return; + + switch (event) { + case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: + saved = pr->performance_platform_limit; + acpi_processor_ppc_has_changed(pr, 1); + if (saved == pr->performance_platform_limit) + break; + acpi_bus_generate_proc_event(device, event, + pr->performance_platform_limit); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, + pr->performance_platform_limit); + break; + case ACPI_PROCESSOR_NOTIFY_POWER: + acpi_processor_cst_has_changed(pr); + acpi_bus_generate_proc_event(device, event, 0); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, 0); + break; + case ACPI_PROCESSOR_NOTIFY_THROTTLING: + acpi_processor_tstate_has_changed(pr); + acpi_bus_generate_proc_event(device, event, 0); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, 0); + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + break; + } + + return; +} + +static int acpi_cpu_soft_notify(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + struct acpi_processor *pr = per_cpu(processors, cpu); + + if (action == CPU_ONLINE && pr) { + acpi_processor_ppc_has_changed(pr, 0); + acpi_processor_cst_has_changed(pr); + acpi_processor_tstate_has_changed(pr); + } + return NOTIFY_OK; +} + +static struct notifier_block acpi_cpu_notifier = +{ + .notifier_call = acpi_cpu_soft_notify, +}; + +static int __cpuinit acpi_processor_add(struct acpi_device *device) +{ + struct acpi_processor *pr = NULL; + int result = 0; + struct sys_device *sysdev; + + pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); + if (!pr) + return -ENOMEM; + + if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) { + kfree(pr); + return -ENOMEM; + } + + pr->handle = device->handle; + strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS); + device->driver_data = pr; + + result = acpi_processor_get_info(device); + if (result) { + /* Processor is physically not present */ + return 0; + } + + BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0)); + + /* + * Buggy BIOS check + * ACPI id of processors can be reported wrongly by the BIOS. + * Don't trust it blindly + */ + if (per_cpu(processor_device_array, pr->id) != NULL && + per_cpu(processor_device_array, pr->id) != device) { + printk(KERN_WARNING "BIOS reported wrong ACPI id " + "for the processor\n"); + result = -ENODEV; + goto err_free_cpumask; + } + per_cpu(processor_device_array, pr->id) = device; + + per_cpu(processors, pr->id) = pr; + + result = acpi_processor_add_fs(device); + if (result) + goto err_free_cpumask; + + sysdev = get_cpu_sysdev(pr->id); + if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { + result = -EFAULT; + goto err_remove_fs; + } + + /* _PDC call should be done before doing anything else (if reqd.). */ + acpi_processor_set_pdc(pr->handle); + +#ifdef CONFIG_CPU_FREQ + acpi_processor_ppc_has_changed(pr, 0); +#endif + acpi_processor_get_throttling_info(pr); + acpi_processor_get_limit_info(pr); + + + acpi_processor_power_init(pr, device); + + pr->cdev = thermal_cooling_device_register("Processor", device, + &processor_cooling_ops); + if (IS_ERR(pr->cdev)) { + result = PTR_ERR(pr->cdev); + goto err_power_exit; + } + + dev_dbg(&device->dev, "registered as cooling_device%d\n", + pr->cdev->id); + + result = sysfs_create_link(&device->dev.kobj, + &pr->cdev->device.kobj, + "thermal_cooling"); + if (result) { + printk(KERN_ERR PREFIX "Create sysfs link\n"); + goto err_thermal_unregister; + } + result = sysfs_create_link(&pr->cdev->device.kobj, + &device->dev.kobj, + "device"); + if (result) { + printk(KERN_ERR PREFIX "Create sysfs link\n"); + goto err_remove_sysfs; + } + + return 0; + +err_remove_sysfs: + sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); +err_thermal_unregister: + thermal_cooling_device_unregister(pr->cdev); +err_power_exit: + acpi_processor_power_exit(pr, device); +err_remove_fs: + acpi_processor_remove_fs(device); +err_free_cpumask: + free_cpumask_var(pr->throttling.shared_cpu_map); + + return result; +} + +static int acpi_processor_remove(struct acpi_device *device, int type) +{ + struct acpi_processor *pr = NULL; + + + if (!device || !acpi_driver_data(device)) + return -EINVAL; + + pr = acpi_driver_data(device); + + if (pr->id >= nr_cpu_ids) + goto free; + + if (type == ACPI_BUS_REMOVAL_EJECT) { + if (acpi_processor_handle_eject(pr)) + return -EINVAL; + } + + acpi_processor_power_exit(pr, device); + + sysfs_remove_link(&device->dev.kobj, "sysdev"); + + acpi_processor_remove_fs(device); + + if (pr->cdev) { + sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); + sysfs_remove_link(&pr->cdev->device.kobj, "device"); + thermal_cooling_device_unregister(pr->cdev); + pr->cdev = NULL; + } + + per_cpu(processors, pr->id) = NULL; + per_cpu(processor_device_array, pr->id) = NULL; + +free: + free_cpumask_var(pr->throttling.shared_cpu_map); + kfree(pr); + + return 0; +} + +#ifdef CONFIG_ACPI_HOTPLUG_CPU +/**************************************************************************** + * Acpi processor hotplug support * + ****************************************************************************/ + +static int is_processor_present(acpi_handle handle) +{ + acpi_status status; + unsigned long long sta = 0; + + + status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); + + if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) + return 1; + + /* + * _STA is mandatory for a processor that supports hot plug + */ + if (status == AE_NOT_FOUND) + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Processor does not support hot plug\n")); + else + ACPI_EXCEPTION((AE_INFO, status, + "Processor Device is not present")); + return 0; +} + +static +int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) +{ + acpi_handle phandle; + struct acpi_device *pdev; + + + if (acpi_get_parent(handle, &phandle)) { + return -ENODEV; + } + + if (acpi_bus_get_device(phandle, &pdev)) { + return -ENODEV; + } + + if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { + return -ENODEV; + } + + return 0; +} + +static void __ref acpi_processor_hotplug_notify(acpi_handle handle, + u32 event, void *data) +{ + struct acpi_processor *pr; + struct acpi_device *device = NULL; + int result; + + + switch (event) { + case ACPI_NOTIFY_BUS_CHECK: + case ACPI_NOTIFY_DEVICE_CHECK: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "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) + printk(KERN_ERR PREFIX + "Unable to add the device\n"); + break; + } + break; + case ACPI_NOTIFY_EJECT_REQUEST: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "received ACPI_NOTIFY_EJECT_REQUEST\n")); + + if (acpi_bus_get_device(handle, &device)) { + printk(KERN_ERR PREFIX + "Device don't exist, dropping EJECT\n"); + break; + } + pr = acpi_driver_data(device); + if (!pr) { + printk(KERN_ERR PREFIX + "Driver data is NULL, dropping EJECT\n"); + return; + } + break; + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + break; + } + + return; +} + +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; + } + + return (AE_OK); +} + +static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) +{ + + if (!is_processor_present(handle)) { + return AE_ERROR; + } + + if (acpi_map_lsapic(handle, p_cpu)) + return AE_ERROR; + + if (arch_register_cpu(*p_cpu)) { + acpi_unmap_lsapic(*p_cpu); + return AE_ERROR; + } + + return AE_OK; +} + +static int acpi_processor_handle_eject(struct acpi_processor *pr) +{ + if (cpu_online(pr->id)) + cpu_down(pr->id); + + 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); +} +#endif + +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, NULL, &action, NULL); +#endif + register_hotcpu_notifier(&acpi_cpu_notifier); +} + +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, NULL, &action, NULL); +#endif + unregister_hotcpu_notifier(&acpi_cpu_notifier); +} + +/* + * 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) +{ + int result = 0; + + if (acpi_disabled) + return 0; + + memset(&errata, 0, sizeof(errata)); + +#ifdef CONFIG_SMP + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, + (struct acpi_table_header **)&madt))) + madt = NULL; +#endif +#ifdef CONFIG_ACPI_PROCFS + acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); + if (!acpi_processor_dir) + return -ENOMEM; +#endif + result = cpuidle_register_driver(&acpi_idle_driver); + if (result < 0) + goto out_proc; + + result = acpi_bus_register_driver(&acpi_processor_driver); + if (result < 0) + goto out_cpuidle; + + acpi_processor_install_hotplug_notify(); + + acpi_thermal_cpufreq_init(); + + acpi_processor_ppc_init(); + + acpi_processor_throttling_init(); + + return 0; + +out_cpuidle: + cpuidle_unregister_driver(&acpi_idle_driver); + +out_proc: +#ifdef CONFIG_ACPI_PROCFS + remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); +#endif + + return result; +} + +static void __exit acpi_processor_exit(void) +{ + if (acpi_disabled) + return; + + acpi_processor_ppc_exit(); + + acpi_thermal_cpufreq_exit(); + + acpi_processor_uninstall_hotplug_notify(); + + acpi_bus_unregister_driver(&acpi_processor_driver); + + cpuidle_unregister_driver(&acpi_idle_driver); + +#ifdef CONFIG_ACPI_PROCFS + remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); +#endif + + return; +} + +module_init(acpi_processor_init); +module_exit(acpi_processor_exit); + +EXPORT_SYMBOL(acpi_processor_set_thermal_limit); + +MODULE_ALIAS("processor"); |