/* * 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/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_COMPONENTACPI_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);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 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;} /* -------------------------------------------------------------------------- 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_reevaluate_tstate(pr, action); acpi_processor_tstate_has_changed(pr); } if (action == CPU_DEAD && pr) { /* invalidate the flag.throttling after one CPU is offline */ acpi_processor_reevaluate_tstate(pr, action); } 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; } #ifdef CONFIG_SMP if (pr->id >= setup_max_cpus && pr->id != 0) return 0;#endif 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; sysdev = get_cpu_sysdev(pr->id); if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { result = -EFAULT; goto err_free_cpumask; } #ifdef CONFIG_CPU_FREQLines 1–500 of 852. 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/* * 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/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); 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 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; } /* -------------------------------------------------------------------------- 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_reevaluate_tstate(pr, action); acpi_processor_tstate_has_changed(pr); } if (action == CPU_DEAD && pr) { /* invalidate the flag.throttling after one CPU is offline */ acpi_processor_reevaluate_tstate(pr, action); } 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; } #ifdef CONFIG_SMP if (pr->id >= setup_max_cpus && pr->id != 0) return 0; #endif 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; sysdev = get_cpu_sysdev(pr->id); if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) { result = -EFAULT; goto err_free_cpumask; } #ifdef CONFIG_CPU_FREQ