| /* |
| * 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 <linux/slab.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 |
| |
| /* -------------------------------------------------------------------------- |
| 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 = acpi_get_cpuid(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; |
| } |
| |
| #ifdef CONFIG_CPU_FREQ |
| acpi_processor_ppc_has_changed(pr, 0); |
| #endif |
| acpi_processor_get_throttling_info(pr); |
| acpi_processor_get_limit_info(pr); |
| |
| |
| if (cpuidle_get_driver() == &acpi_idle_driver) |
| 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_ACPI_PROCFS |
| acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); |
| if (!acpi_processor_dir) |
| return -ENOMEM; |
| #endif |
| |
| if (!cpuidle_register_driver(&acpi_idle_driver)) |
| printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n", |
| acpi_idle_driver.name); |
| |
| 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); |
| |
| #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"); |