/* * 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 <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_DRIVER_NAME "ACPI Processor Driver"#define ACPI_PROCESSOR_DEVICE_NAME "Processor"#define ACPI_PROCESSOR_FILE_INFO "info"#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"#define ACPI_PROCESSOR_FILE_LIMIT "limit"#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80#define ACPI_PROCESSOR_NOTIFY_POWER 0x81 #define ACPI_PROCESSOR_LIMIT_USER 0#define ACPI_PROCESSOR_LIMIT_THERMAL 1 #define ACPI_STA_PRESENT 0x00000001 #define _COMPONENT ACPI_PROCESSOR_COMPONENTACPI_MODULE_NAME ("acpi_processor") MODULE_AUTHOR("Paul Diefenbaugh");MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);MODULE_LICENSE("GPL"); static int acpi_processor_add (struct acpi_device *device);static int acpi_processor_start (struct acpi_device *device);static int acpi_processor_remove (struct acpi_device *device, int type);static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data);static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);static int acpi_processor_handle_eject(struct acpi_processor *pr); static struct acpi_driver acpi_processor_driver = { .name = ACPI_PROCESSOR_DRIVER_NAME, .class = ACPI_PROCESSOR_CLASS, .ids = ACPI_PROCESSOR_HID, .ops = { .add = acpi_processor_add, .remove = acpi_processor_remove, .start = acpi_processor_start, },}; #define INSTALL_NOTIFY_HANDLER 1#define UNINSTALL_NOTIFY_HANDLER 2 static 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; /* -------------------------------------------------------------------------- Errata Handling -------------------------------------------------------------------------- */ static intacpi_processor_errata_piix4 ( struct pci_dev *dev){ u8 rev = 0; u8 value1 = 0; u8 value2 = 0; ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4"); if (!dev) return_VALUE(-EINVAL); /* * Note that 'dev' references the PIIX4 ACPI Controller. */ pci_read_config_byte(dev, PCI_REVISION_ID, &rev); switch (rev) { case 0: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); break; case 1: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); break; case 2: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); break; case 3: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); break; } switch (rev) { 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_VALUE(0);} intacpi_processor_errata ( struct acpi_processor *pr){ int result = 0; struct pci_dev *dev = NULL; ACPI_FUNCTION_TRACE("acpi_processor_errata"); if (!pr) return_VALUE(-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_VALUE(result);} /* -------------------------------------------------------------------------- Common ACPI processor fucntions -------------------------------------------------------------------------- */ /* * _PDC is required for a BIOS-OS handshake for most of the newer * ACPI processor features. */ int acpi_processor_set_pdc(struct acpi_processor *pr, struct acpi_object_list *pdc_in){ acpi_status status = AE_OK; u32 arg0_buf[3]; union acpi_object arg0 = {ACPI_TYPE_BUFFER}; struct acpi_object_list no_object = {1, &arg0}; struct acpi_object_list *pdc; ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); arg0.buffer.length = 12; arg0.buffer.pointer = (u8 *) arg0_buf; arg0_buf[0] = ACPI_PDC_REVISION_ID; arg0_buf[1] = 0; arg0_buf[2] = 0; pdc = (pdc_in) ? pdc_in : &no_object; status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); if ((ACPI_FAILURE(status)) && (pdc_in)) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n")); return_VALUE(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 = (struct acpi_processor *)seq->private; ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); if (!pr) goto end; seq_printf(seq, "processor id: %d\n" "acpi id: %d\n" "bus mastering control: %s\n" "power management: %s\n" "throttling control: %s\n" "limit interface: %s\n", pr->id, pr->acpi_id, pr->flags.bm_control ? "yes" : "no", pr->flags.power ? "yes" : "no", pr->flags.throttling ? "yes" : "no", pr->flags.limit ? "yes" : "no"); end: return_VALUE(0);} 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 intacpi_processor_add_fs ( struct acpi_device *device){ struct proc_dir_entry *entry = NULL; ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); if (!acpi_device_dir(device)) { acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_processor_dir); if (!acpi_device_dir(device)) return_VALUE(-ENODEV); } acpi_device_dir(device)->owner = THIS_MODULE; /* 'info' [R] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, S_IRUGO, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_INFO)); else { entry->proc_fops = &acpi_processor_info_fops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'throttling' [R/W] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_THROTTLING)); else { entry->proc_fops = &acpi_processor_throttling_fops; entry->proc_fops->write = acpi_processor_write_throttling; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'limit' [R/W] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_LIMIT)); else { entry->proc_fops = &acpi_processor_limit_fops; entry->proc_fops->write = acpi_processor_write_limit; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } return_VALUE(0);} static intacpi_processor_remove_fs ( struct acpi_device *device){ ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); if (acpi_device_dir(device)) { remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,acpi_device_dir(device)); remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, acpi_device_dir(device)); remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); acpi_device_dir(device) = NULL; } return_VALUE(0);} /* Use the acpiid in MADT to map cpus in case of SMP */#ifndef CONFIG_SMP#define convert_acpiid_to_cpu(acpi_id) (0xff)#else #ifdef CONFIG_IA64#define arch_acpiid_to_apicid ia64_acpiid_to_sapicid#define arch_cpu_to_apicid ia64_cpu_to_sapicid#define ARCH_BAD_APICID (0xffff)#else#define arch_acpiid_to_apicid x86_acpiid_to_apicid#define arch_cpu_to_apicid x86_cpu_to_apicid#define ARCH_BAD_APICID (0xff)#endif static u8 convert_acpiid_to_cpu(u8 acpi_id){ u16 apic_id; int i; apic_id = arch_acpiid_to_apicid[acpi_id]; if (apic_id == ARCH_BAD_APICID) return -1; for (i = 0; i < NR_CPUS; i++) { if (arch_cpu_to_apicid[i] == apic_id) return i; } return -1;}#endif /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static intacpi_processor_get_info ( struct acpi_processor *pr){ acpi_status status = 0; union acpi_object object = {0}; struct acpi_buffer buffer = {sizeof(union acpi_object), &object}; u8 cpu_index; static int cpu0_initialized; ACPI_FUNCTION_TRACE("acpi_processor_get_info"); if (!pr) return_VALUE(-EINVAL); if (num_online_cpus() > 1) errata.smp = TRUE; acpi_processor_errata(pr); /* * Check to see if we have bus mastering arbitration control. This * is required for proper C3 usage (to maintain cache coherency). */ if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { pr->flags.bm_control = 1; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Bus mastering arbitration control present\n")); } else ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No bus mastering arbitration control\n")); /* * Evalute the processor object. Note that it is common on SMP to * have the first (boot) processor with a valid PBLK address while * all others have a NULL address. */ status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating processor object\n")); return_VALUE(-ENODEV); } /* * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c */ pr->acpi_id = object.processor.proc_id; cpu_index = convert_acpiid_to_cpu(pr->acpi_id);Lines 1–500 of 1026. Load more
/* * 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 <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_DRIVER_NAME "ACPI Processor Driver" #define ACPI_PROCESSOR_DEVICE_NAME "Processor" #define ACPI_PROCESSOR_FILE_INFO "info" #define ACPI_PROCESSOR_FILE_THROTTLING "throttling" #define ACPI_PROCESSOR_FILE_LIMIT "limit" #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 #define ACPI_PROCESSOR_LIMIT_USER 0 #define ACPI_PROCESSOR_LIMIT_THERMAL 1 #define ACPI_STA_PRESENT 0x00000001 #define _COMPONENT ACPI_PROCESSOR_COMPONENT ACPI_MODULE_NAME ("acpi_processor") MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME); MODULE_LICENSE("GPL"); static int acpi_processor_add (struct acpi_device *device); static int acpi_processor_start (struct acpi_device *device); static int acpi_processor_remove (struct acpi_device *device, int type); static int acpi_processor_info_open_fs(struct inode *inode, struct file *file); static void acpi_processor_notify ( acpi_handle handle, u32 event, void *data); static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu); static int acpi_processor_handle_eject(struct acpi_processor *pr); static struct acpi_driver acpi_processor_driver = { .name = ACPI_PROCESSOR_DRIVER_NAME, .class = ACPI_PROCESSOR_CLASS, .ids = ACPI_PROCESSOR_HID, .ops = { .add = acpi_processor_add, .remove = acpi_processor_remove, .start = acpi_processor_start, }, }; #define INSTALL_NOTIFY_HANDLER 1 #define UNINSTALL_NOTIFY_HANDLER 2 static 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; /* -------------------------------------------------------------------------- Errata Handling -------------------------------------------------------------------------- */ static int acpi_processor_errata_piix4 ( struct pci_dev *dev) { u8 rev = 0; u8 value1 = 0; u8 value2 = 0; ACPI_FUNCTION_TRACE("acpi_processor_errata_piix4"); if (!dev) return_VALUE(-EINVAL); /* * Note that 'dev' references the PIIX4 ACPI Controller. */ pci_read_config_byte(dev, PCI_REVISION_ID, &rev); switch (rev) { case 0: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n")); break; case 1: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n")); break; case 2: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n")); break; case 3: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n")); break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n")); break; } switch (rev) { 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_VALUE(0); } int acpi_processor_errata ( struct acpi_processor *pr) { int result = 0; struct pci_dev *dev = NULL; ACPI_FUNCTION_TRACE("acpi_processor_errata"); if (!pr) return_VALUE(-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_VALUE(result); } /* -------------------------------------------------------------------------- Common ACPI processor fucntions -------------------------------------------------------------------------- */ /* * _PDC is required for a BIOS-OS handshake for most of the newer * ACPI processor features. */ int acpi_processor_set_pdc(struct acpi_processor *pr, struct acpi_object_list *pdc_in) { acpi_status status = AE_OK; u32 arg0_buf[3]; union acpi_object arg0 = {ACPI_TYPE_BUFFER}; struct acpi_object_list no_object = {1, &arg0}; struct acpi_object_list *pdc; ACPI_FUNCTION_TRACE("acpi_processor_set_pdc"); arg0.buffer.length = 12; arg0.buffer.pointer = (u8 *) arg0_buf; arg0_buf[0] = ACPI_PDC_REVISION_ID; arg0_buf[1] = 0; arg0_buf[2] = 0; pdc = (pdc_in) ? pdc_in : &no_object; status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); if ((ACPI_FAILURE(status)) && (pdc_in)) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n")); return_VALUE(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 = (struct acpi_processor *)seq->private; ACPI_FUNCTION_TRACE("acpi_processor_info_seq_show"); if (!pr) goto end; seq_printf(seq, "processor id: %d\n" "acpi id: %d\n" "bus mastering control: %s\n" "power management: %s\n" "throttling control: %s\n" "limit interface: %s\n", pr->id, pr->acpi_id, pr->flags.bm_control ? "yes" : "no", pr->flags.power ? "yes" : "no", pr->flags.throttling ? "yes" : "no", pr->flags.limit ? "yes" : "no"); end: return_VALUE(0); } 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; ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); if (!acpi_device_dir(device)) { acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_processor_dir); if (!acpi_device_dir(device)) return_VALUE(-ENODEV); } acpi_device_dir(device)->owner = THIS_MODULE; /* 'info' [R] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO, S_IRUGO, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_INFO)); else { entry->proc_fops = &acpi_processor_info_fops; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'throttling' [R/W] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_THROTTLING)); else { entry->proc_fops = &acpi_processor_throttling_fops; entry->proc_fops->write = acpi_processor_write_throttling; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } /* 'limit' [R/W] */ entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT, S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device)); if (!entry) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to create '%s' fs entry\n", ACPI_PROCESSOR_FILE_LIMIT)); else { entry->proc_fops = &acpi_processor_limit_fops; entry->proc_fops->write = acpi_processor_write_limit; entry->data = acpi_driver_data(device); entry->owner = THIS_MODULE; } return_VALUE(0); } static int acpi_processor_remove_fs ( struct acpi_device *device) { ACPI_FUNCTION_TRACE("acpi_processor_remove_fs"); if (acpi_device_dir(device)) { remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,acpi_device_dir(device)); remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING, acpi_device_dir(device)); remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_processor_dir); acpi_device_dir(device) = NULL; } return_VALUE(0); } /* Use the acpiid in MADT to map cpus in case of SMP */ #ifndef CONFIG_SMP #define convert_acpiid_to_cpu(acpi_id) (0xff) #else #ifdef CONFIG_IA64 #define arch_acpiid_to_apicid ia64_acpiid_to_sapicid #define arch_cpu_to_apicid ia64_cpu_to_sapicid #define ARCH_BAD_APICID (0xffff) #else #define arch_acpiid_to_apicid x86_acpiid_to_apicid #define arch_cpu_to_apicid x86_cpu_to_apicid #define ARCH_BAD_APICID (0xff) #endif static u8 convert_acpiid_to_cpu(u8 acpi_id) { u16 apic_id; int i; apic_id = arch_acpiid_to_apicid[acpi_id]; if (apic_id == ARCH_BAD_APICID) return -1; for (i = 0; i < NR_CPUS; i++) { if (arch_cpu_to_apicid[i] == apic_id) return i; } return -1; } #endif /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static int acpi_processor_get_info ( struct acpi_processor *pr) { acpi_status status = 0; union acpi_object object = {0}; struct acpi_buffer buffer = {sizeof(union acpi_object), &object}; u8 cpu_index; static int cpu0_initialized; ACPI_FUNCTION_TRACE("acpi_processor_get_info"); if (!pr) return_VALUE(-EINVAL); if (num_online_cpus() > 1) errata.smp = TRUE; acpi_processor_errata(pr); /* * Check to see if we have bus mastering arbitration control. This * is required for proper C3 usage (to maintain cache coherency). */ if (acpi_fadt.V1_pm2_cnt_blk && acpi_fadt.pm2_cnt_len) { pr->flags.bm_control = 1; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Bus mastering arbitration control present\n")); } else ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No bus mastering arbitration control\n")); /* * Evalute the processor object. Note that it is common on SMP to * have the first (boot) processor with a valid PBLK address while * all others have a NULL address. */ status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating processor object\n")); return_VALUE(-ENODEV); } /* * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP. * >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c */ pr->acpi_id = object.processor.proc_id; cpu_index = convert_acpiid_to_cpu(pr->acpi_id);