/* * 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 ACPI_PROCESSOR_COMPONENT 0x01000000 #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_core"); 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_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); extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr); static const struct acpi_device_id processor_device_ids[] = { {ACPI_PROCESSOR_HID, 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, .start = acpi_processor_start, .suspend = acpi_processor_suspend, .resume = acpi_processor_resume, }, }; #define INSTALL_NOTIFY_HANDLER 1 #define UNINSTALL_NOTIFY_HANDLER 2 static const struct file_operations acpi_processor_info_fops = { .open = acpi_processor_info_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; struct acpi_processor *processors[NR_CPUS]; 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; } /* -------------------------------------------------------------------------- Common ACPI processor functions -------------------------------------------------------------------------- */ /* * _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) { struct acpi_object_list *pdc_in = pr->pdc; acpi_status status = AE_OK; if (!pdc_in) return status; 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 status; } /* -------------------------------------------------------------------------- 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) { 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 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; } 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) return -EIO; 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) return -EIO; else { entry->proc_fops = &acpi_processor_throttling_fops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'limit' [R/W] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, S_IFREG | S_IRUGO | S_IWUSR, acpi_device_dir(device)); if (!entry) return -EIO; else { entry->proc_fops = &acpi_processor_limit_fops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } 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; } /* Use the acpiid in MADT to map cpus in case of SMP */ #ifndef CONFIG_SMP static int get_cpu_id(acpi_handle handle, 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_lsapic_id(struct acpi_subtable_header *entry, u32 acpi_id, int *apic_id) { struct acpi_madt_local_sapic *lsapic = (struct acpi_madt_local_sapic *)entry; /* Only check enabled APICs*/ if (lsapic->lapic_flags & ACPI_MADT_ENABLED) { /* First check against id */ if (lsapic->processor_id == acpi_id) { *apic_id = (lsapic->id << 8) | lsapic->eid; return 1; /* Check against optional uid */ } else if (entry->length >= 16 && lsapic->uid == acpi_id) { *apic_id = lsapic->uid; return 1; } } return 0; } static int map_madt_entry(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_SAPIC) { if (map_lsapic_id(header, acpi_id, &apic_id)) break; } entry += header->length; } return apic_id; } static int map_mat_entry(acpi_handle handle, 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, acpi_id, &apic_id); } exit: if (buffer.pointer) kfree(buffer.pointer); return apic_id; } static int get_cpu_id(acpi_handle handle, u32 acpi_id) { int i; int apic_id = -1; apic_id = map_mat_entry(handle, acpi_id); if (apic_id == -1) apic_id = map_madt_entry(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_processor *pr, unsigned has_uid) { acpi_status status = 0; union acpi_object object = { 0 }; struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; int cpu_index; static int cpu0_initialized; 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")); /* Check if it is a Device with HID and UID */ if (has_uid) { unsigned long value; status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID, NULL, &value); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Evaluating processor _UID\n"); return -ENODEV; } pr->acpi_id = value; } else { /* * 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)) { 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; } cpu_index = get_cpu_id(pr->handle, 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; } } 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"); } return 0; } static void *processor_device_array[NR_CPUS]; static int __cpuinit acpi_processor_start(struct acpi_device *device) { int result = 0; acpi_status status = AE_OK; struct acpi_processor *pr; pr = acpi_driver_data(device); result = acpi_processor_get_info(pr, device->flags.unique_id); 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 (processor_device_array[pr->id] != NULL && processor_device_array[pr->id] != device) { printk(KERN_WARNING "BIOS reported wrong ACPI id " "for the processor\n"); return -ENODEV; } processor_device_array[pr->id] = device; 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); /* _PDC call should be done before doing anything else (if reqd.). */ arch_acpi_processor_init_pdc(pr); acpi_processor_set_pdc(pr); #ifdef CONFIG_CPU_FREQ acpi_processor_ppc_has_changed(pr); #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 end; } if (pr->cdev) { printk(KERN_INFO PREFIX "%s is registered as cooling_device%d\n", device->dev.bus_id, pr->cdev->id); result = sysfs_create_link(&device->dev.kobj, &pr->cdev->device.kobj, "thermal_cooling"); if (result) return result; result = sysfs_create_link(&pr->cdev->device.kobj, &device->dev.kobj, "device"); if (result) return result; } 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 result; } static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) { struct acpi_processor *pr = data; struct acpi_device *device = NULL; int saved; if (!pr) return; if (acpi_bus_get_device(pr->handle, &device)) return; switch (event) { case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: saved = pr->performance_platform_limit; acpi_processor_ppc_has_changed(pr); 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, device->dev.bus_id, 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, device->dev.bus_id, 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, device->dev.bus_id, 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 = processors[cpu]; if (action == CPU_ONLINE && pr) { acpi_processor_ppc_has_changed(pr); 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 acpi_processor_add(struct acpi_device *device) { struct acpi_processor *pr = NULL; if (!device) return -EINVAL; pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); if (!pr) return -ENOMEM; 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 0; } static int acpi_processor_remove(struct acpi_device *device, int type) { acpi_status status = AE_OK; struct acpi_processor *pr = NULL; if (!device || !acpi_driver_data(device)) return -EINVAL; pr = acpi_driver_data(device); if (pr->id >= nr_cpu_ids) { kfree(pr); return 0; } if (type == ACPI_BUS_REMOVAL_EJECT) { if (acpi_processor_handle_eject(pr)) return -EINVAL; } acpi_processor_power_exit(pr, device); status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, acpi_processor_notify); 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; } processors[pr->id] = NULL; 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 sta = 0; status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); /* * if a processor object does not have an _STA object, * OSPM assumes that the processor is present. */ if (status == AE_NOT_FOUND) return 1; if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT)) return 1; 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; struct acpi_processor *pr; 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; } acpi_bus_start(*device); pr = acpi_driver_data(*device); if (!pr) return -ENODEV; if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) { kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE); } return 0; } static void 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: 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) printk(KERN_ERR PREFIX "Unable to add the device\n"); break; } pr = acpi_driver_data(device); if (!pr) { printk(KERN_ERR PREFIX "Driver data is NULL\n"); break; } if (pr->id >= 0 && (pr->id < nr_cpu_ids)) { kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); break; } result = acpi_processor_start(device); if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) { kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); } else { printk(KERN_ERR PREFIX "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 (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; } if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id))) kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); 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)) { 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); } #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, &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, &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; memset(&processors, 0, sizeof(processors)); 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 acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); if (!acpi_processor_dir) return -ENOMEM; acpi_processor_dir->owner = THIS_MODULE; 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: remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); return result; } static void __exit acpi_processor_exit(void) { 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); remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); return; } module_init(acpi_processor_init); module_exit(acpi_processor_exit); EXPORT_SYMBOL(acpi_processor_set_thermal_limit); MODULE_ALIAS("processor");