diff options
Diffstat (limited to 'drivers/acpi/processor_core.c')
| -rw-r--r-- | drivers/acpi/processor_core.c | 1131 |
1 files changed, 281 insertions, 850 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 42179256264..71e2065639a 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -1,971 +1,402 @@ /* - * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) + * Copyright (C) 2005 Intel Corporation + * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. * - * 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. + * Alex Chiang <achiang@hp.com> + * - Unified x86/ia64 implementations + * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> + * - Added _PDC for platforms with Intel CPUs */ - -#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/export.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 <linux/slab.h> +#include <linux/acpi.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 +#include "internal.h" #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, -}; +ACPI_MODULE_NAME("processor_core"); -struct acpi_processor *processors[NR_CPUS]; -struct acpi_processor_errata errata; - -/* -------------------------------------------------------------------------- - Errata Handling - -------------------------------------------------------------------------- */ - -static int acpi_processor_errata_piix4(struct pci_dev *dev) +static int map_lapic_id(struct acpi_subtable_header *entry, + u32 acpi_id, int *apic_id) { - 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; + struct acpi_madt_local_apic *lapic = + (struct acpi_madt_local_apic *)entry; - 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 (!(lapic->lapic_flags & ACPI_MADT_ENABLED)) + return -ENODEV; - 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")); + if (lapic->processor_id != acpi_id) + return -EINVAL; - return_VALUE(0); + *apic_id = lapic->id; + return 0; } -static int acpi_processor_errata(struct acpi_processor *pr) +static int map_x2apic_id(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, int *apic_id) { - int result = 0; - struct pci_dev *dev = NULL; - - ACPI_FUNCTION_TRACE("acpi_processor_errata"); + struct acpi_madt_local_x2apic *apic = + (struct acpi_madt_local_x2apic *)entry; - if (!pr) - return_VALUE(-EINVAL); + if (!(apic->lapic_flags & ACPI_MADT_ENABLED)) + return -ENODEV; - /* - * 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); + if (device_declaration && (apic->uid == acpi_id)) { + *apic_id = apic->local_apic_id; + return 0; } - return_VALUE(result); + return -EINVAL; } -/* -------------------------------------------------------------------------- - 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) +static int map_lsapic_id(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, int *apic_id) { - 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; + struct acpi_madt_local_sapic *lsapic = + (struct acpi_madt_local_sapic *)entry; - status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL); + if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED)) + return -ENODEV; - if ((ACPI_FAILURE(status)) && (pdc_in)) - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Error evaluating _PDC, using legacy perf. control...\n")); + if (device_declaration) { + if ((entry->length < 16) || (lsapic->uid != acpi_id)) + return -EINVAL; + } else if (lsapic->processor_id != acpi_id) + return -EINVAL; - return_VALUE(status); + *apic_id = (lsapic->id << 8) | lsapic->eid; + return 0; } -/* -------------------------------------------------------------------------- - 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) +static int map_madt_entry(int type, u32 acpi_id) { - 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); -} + unsigned long madt_end, entry; + static struct acpi_table_madt *madt; + static int read_madt; + int apic_id = -1; + + if (!read_madt) { + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0, + (struct acpi_table_header **)&madt))) + madt = NULL; + read_madt++; + } -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); + if (!madt) + return apic_id; + + entry = (unsigned long)madt; + madt_end = entry + madt->header.length; + + /* Parse all entries looking for a match. */ + + entry += sizeof(struct acpi_table_madt); + while (entry + sizeof(struct acpi_subtable_header) < madt_end) { + struct acpi_subtable_header *header = + (struct acpi_subtable_header *)entry; + if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { + if (!map_lapic_id(header, acpi_id, &apic_id)) + break; + } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { + if (!map_x2apic_id(header, type, acpi_id, &apic_id)) + break; + } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { + if (!map_lsapic_id(header, type, acpi_id, &apic_id)) + break; + } + entry += header->length; + } + return apic_id; } -static int acpi_processor_add_fs(struct acpi_device *device) +static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) { - struct proc_dir_entry *entry = NULL; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + struct acpi_subtable_header *header; + int apic_id = -1; - ACPI_FUNCTION_TRACE("acpi_processor_add_fs"); + if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer))) + goto exit; - 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; - } + if (!buffer.length || !buffer.pointer) + goto exit; - /* '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; + obj = buffer.pointer; + if (obj->type != ACPI_TYPE_BUFFER || + obj->buffer.length < sizeof(struct acpi_subtable_header)) { + goto exit; } - /* '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; + header = (struct acpi_subtable_header *)obj->buffer.pointer; + if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) { + map_lapic_id(header, acpi_id, &apic_id); + } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { + map_lsapic_id(header, type, acpi_id, &apic_id); } - return_VALUE(0); +exit: + kfree(buffer.pointer); + return apic_id; } -static int acpi_processor_remove_fs(struct acpi_device *device) +int acpi_get_apicid(acpi_handle handle, int type, u32 acpi_id) { - 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); -} + int apic_id; -/* Use the acpiid in MADT to map cpus in case of SMP */ -#ifndef CONFIG_SMP -#define convert_acpiid_to_cpu(acpi_id) (0xff) -#else + apic_id = map_mat_entry(handle, type, acpi_id); + if (apic_id == -1) + apic_id = map_madt_entry(type, acpi_id); -#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 + return apic_id; +} -static u8 convert_acpiid_to_cpu(u8 acpi_id) +int acpi_map_cpuid(int apic_id, u32 acpi_id) { - u16 apic_id; +#ifdef CONFIG_SMP 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); - - /* Handle UP system running SMP kernel, with no LAPIC in MADT */ - if (!cpu0_initialized && (cpu_index == 0xff) && - (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 (cpu_index >= NR_CPUS) { - if (ACPI_FAILURE - (acpi_processor_hotadd_init(pr->handle, &pr->id))) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Error getting cpuindex for acpiid 0x%x\n", - pr->acpi_id)); - return_VALUE(-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) - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid PBLK length [%d]\n", - object.processor.pblk_length)); - else { - pr->throttling.address = object.processor.pblk_address; - pr->throttling.duty_offset = acpi_fadt.duty_offset; - pr->throttling.duty_width = acpi_fadt.duty_width; - - pr->pblk = object.processor.pblk_address; - + if (apic_id == -1) { /* - * 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.. + * On UP processor, there is no _MAT or MADT table. + * So above apic_id is always set to -1. + * + * BIOS may define multiple CPU handles even for UP processor. + * For example, * - * (In particular, allocating the IO range for Cardbus) + * Scope (_PR) + * { + * Processor (CPU0, 0x00, 0x00000410, 0x06) {} + * Processor (CPU1, 0x01, 0x00000410, 0x06) {} + * Processor (CPU2, 0x02, 0x00000410, 0x06) {} + * Processor (CPU3, 0x03, 0x00000410, 0x06) {} + * } + * + * Ignores apic_id and always returns 0 for the processor + * handle with acpi id 0 if nr_cpu_ids is 1. + * This should be the case if SMP tables are not found. + * Return -1 for other CPU's handle. */ - request_region(pr->throttling.address, 6, "ACPI CPU throttle"); + if (nr_cpu_ids <= 1 && acpi_id == 0) + return acpi_id; + else + return apic_id; } -#ifdef CONFIG_CPU_FREQ - acpi_processor_ppc_has_changed(pr); +#ifdef CONFIG_SMP + for_each_possible_cpu(i) { + if (cpu_physical_id(i) == apic_id) + return i; + } +#else + /* In UP kernel, only processor 0 is valid */ + if (apic_id == 0) + return apic_id; #endif - acpi_processor_get_throttling_info(pr); - acpi_processor_get_limit_info(pr); - - return_VALUE(0); + return -1; } -static int acpi_processor_start(struct acpi_device *device) +int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) { - int result = 0; - acpi_status status = AE_OK; - struct acpi_processor *pr; - - ACPI_FUNCTION_TRACE("acpi_processor_start"); + int apic_id; - pr = acpi_driver_data(device); + apic_id = acpi_get_apicid(handle, type, acpi_id); - result = acpi_processor_get_info(pr); - if (result) { - /* Processor is physically not present */ - return_VALUE(0); - } - - BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0)); - - 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); - if (ACPI_FAILURE(status)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Error installing device notify handler\n")); - } - - acpi_processor_power_init(pr, device); - - 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_VALUE(result); + return acpi_map_cpuid(apic_id, acpi_id); } +EXPORT_SYMBOL_GPL(acpi_get_cpuid); -static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) +static bool __init processor_physically_present(acpi_handle handle) { - struct acpi_processor *pr = (struct acpi_processor *)data; - struct acpi_device *device = NULL; - - ACPI_FUNCTION_TRACE("acpi_processor_notify"); - - if (!pr) - return_VOID; - - if (acpi_bus_get_device(pr->handle, &device)) - return_VOID; + int cpuid, type; + u32 acpi_id; + acpi_status status; + acpi_object_type acpi_type; + unsigned long long tmp; + union acpi_object object = { 0 }; + struct acpi_buffer buffer = { sizeof(union acpi_object), &object }; - switch (event) { - case ACPI_PROCESSOR_NOTIFY_PERFORMANCE: - acpi_processor_ppc_has_changed(pr); - acpi_bus_generate_event(device, event, - pr->performance_platform_limit); + status = acpi_get_type(handle, &acpi_type); + if (ACPI_FAILURE(status)) + return false; + + switch (acpi_type) { + case ACPI_TYPE_PROCESSOR: + status = acpi_evaluate_object(handle, NULL, NULL, &buffer); + if (ACPI_FAILURE(status)) + return false; + acpi_id = object.processor.proc_id; break; - case ACPI_PROCESSOR_NOTIFY_POWER: - acpi_processor_cst_has_changed(pr); - acpi_bus_generate_event(device, event, 0); + case ACPI_TYPE_DEVICE: + status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp); + if (ACPI_FAILURE(status)) + return false; + acpi_id = tmp; break; default: - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Unsupported event [0x%x]\n", event)); - break; + return false; } - return_VOID; -} - -static int acpi_processor_add(struct acpi_device *device) -{ - struct acpi_processor *pr = NULL; - - ACPI_FUNCTION_TRACE("acpi_processor_add"); - - if (!device) - return_VALUE(-EINVAL); + type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0; + cpuid = acpi_get_cpuid(handle, type, acpi_id); - pr = kmalloc(sizeof(struct acpi_processor), GFP_KERNEL); - if (!pr) - return_VALUE(-ENOMEM); - memset(pr, 0, sizeof(struct acpi_processor)); + if (cpuid == -1) + return false; - 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_VALUE(0); + return true; } -static int acpi_processor_remove(struct acpi_device *device, int type) +static void acpi_set_pdc_bits(u32 *buf) { - acpi_status status = AE_OK; - struct acpi_processor *pr = NULL; - - ACPI_FUNCTION_TRACE("acpi_processor_remove"); - - if (!device || !acpi_driver_data(device)) - return_VALUE(-EINVAL); + buf[0] = ACPI_PDC_REVISION_ID; + buf[1] = 1; - pr = (struct acpi_processor *)acpi_driver_data(device); - - if (pr->id >= NR_CPUS) { - kfree(pr); - return_VALUE(0); - } - - if (type == ACPI_BUS_REMOVAL_EJECT) { - if (acpi_processor_handle_eject(pr)) - return_VALUE(-EINVAL); - } + /* Enable coordination with firmware's _TSD info */ + buf[2] = ACPI_PDC_SMP_T_SWCOORD; - acpi_processor_power_exit(pr, device); - - status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY, - acpi_processor_notify); - if (ACPI_FAILURE(status)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Error removing notify handler\n")); - } - - acpi_processor_remove_fs(device); - - processors[pr->id] = NULL; - - kfree(pr); - - return_VALUE(0); + /* Twiddle arch-specific bits needed for _PDC */ + arch_acpi_set_pdc_bits(buf); } -#ifdef CONFIG_ACPI_HOTPLUG_CPU -/**************************************************************************** - * Acpi processor hotplug support * - ****************************************************************************/ - -static int is_processor_present(acpi_handle handle); - -static int is_processor_present(acpi_handle handle) +static struct acpi_object_list *acpi_processor_alloc_pdc(void) { - acpi_status status; - unsigned long sta = 0; - - ACPI_FUNCTION_TRACE("is_processor_present"); - - status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); - if (ACPI_FAILURE(status) || !(sta & ACPI_STA_PRESENT)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Processor Device is not present\n")); - return_VALUE(0); + struct acpi_object_list *obj_list; + union acpi_object *obj; + u32 *buf; + + /* allocate and initialize pdc. It will be used later. */ + obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL); + if (!obj_list) { + printk(KERN_ERR "Memory allocation error\n"); + return NULL; } - return_VALUE(1); -} -static -int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device) -{ - acpi_handle phandle; - struct acpi_device *pdev; - struct acpi_processor *pr; - - ACPI_FUNCTION_TRACE("acpi_processor_device_add"); - - if (acpi_get_parent(handle, &phandle)) { - return_VALUE(-ENODEV); + obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL); + if (!obj) { + printk(KERN_ERR "Memory allocation error\n"); + kfree(obj_list); + return NULL; } - if (acpi_bus_get_device(phandle, &pdev)) { - return_VALUE(-ENODEV); + buf = kmalloc(12, GFP_KERNEL); + if (!buf) { + printk(KERN_ERR "Memory allocation error\n"); + kfree(obj); + kfree(obj_list); + return NULL; } - if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) { - return_VALUE(-ENODEV); - } + acpi_set_pdc_bits(buf); - acpi_bus_start(*device); + obj->type = ACPI_TYPE_BUFFER; + obj->buffer.length = 12; + obj->buffer.pointer = (u8 *) buf; + obj_list->count = 1; + obj_list->pointer = obj; - pr = acpi_driver_data(*device); - if (!pr) - return_VALUE(-ENODEV); - - if ((pr->id >= 0) && (pr->id < NR_CPUS)) { - kobject_hotplug(&(*device)->kobj, KOBJ_ONLINE); - } - return_VALUE(0); + return obj_list; } -static void -acpi_processor_hotplug_notify(acpi_handle handle, u32 event, void *data) +/* + * _PDC is required for a BIOS-OS handshake for most of the newer + * ACPI processor features. + */ +static acpi_status +acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in) { - struct acpi_processor *pr; - struct acpi_device *device = NULL; - int result; - - ACPI_FUNCTION_TRACE("acpi_processor_hotplug_notify"); - - 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) - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Unable to add the device\n")); - break; - } - - pr = acpi_driver_data(device); - if (!pr) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Driver data is NULL\n")); - break; - } - - if (pr->id >= 0 && (pr->id < NR_CPUS)) { - kobject_hotplug(&device->kobj, KOBJ_OFFLINE); - break; - } + acpi_status status = AE_OK; - result = acpi_processor_start(device); - if ((!result) && ((pr->id >= 0) && (pr->id < NR_CPUS))) { - kobject_hotplug(&device->kobj, KOBJ_ONLINE); - } else { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "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 (boot_option_idle_override == IDLE_NOMWAIT) { + /* + * If mwait is disabled for CPU C-states, the C2C3_FFH access + * mode will be disabled in the parameter of _PDC object. + * Of course C1_FFH access mode will also be disabled. + */ + union acpi_object *obj; + u32 *buffer = NULL; - if (acpi_bus_get_device(handle, &device)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Device don't exist, dropping EJECT\n")); - break; - } - pr = acpi_driver_data(device); - if (!pr) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Driver data is NULL, dropping EJECT\n")); - return_VOID; - } + obj = pdc_in->pointer; + buffer = (u32 *)(obj->buffer.pointer); + buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH); - if ((pr->id < NR_CPUS) && (cpu_present(pr->id))) - kobject_hotplug(&device->kobj, KOBJ_OFFLINE); - break; - default: - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Unsupported event [0x%x]\n", event)); - break; } + status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL); - return_VOID; -} - -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; - } + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Could not evaluate _PDC, using legacy perf. control.\n")); - return (AE_OK); + return status; } -static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu) +void acpi_processor_set_pdc(acpi_handle handle) { - ACPI_FUNCTION_TRACE("acpi_processor_hotadd_init"); + struct acpi_object_list *obj_list; - if (!is_processor_present(handle)) { - return_VALUE(AE_ERROR); - } + if (arch_has_acpi_pdc() == false) + return; - if (acpi_map_lsapic(handle, p_cpu)) - return_VALUE(AE_ERROR); + obj_list = acpi_processor_alloc_pdc(); + if (!obj_list) + return; - if (arch_register_cpu(*p_cpu)) { - acpi_unmap_lsapic(*p_cpu); - return_VALUE(AE_ERROR); - } + acpi_processor_eval_pdc(handle, obj_list); - return_VALUE(AE_OK); + kfree(obj_list->pointer->buffer.pointer); + kfree(obj_list->pointer); + kfree(obj_list); } -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) +static acpi_status __init +early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv) { - return (-EINVAL); -} -#endif + if (processor_physically_present(handle) == false) + return AE_OK; -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 + acpi_processor_set_pdc(handle); + return AE_OK; } -static -void acpi_processor_uninstall_hotplug_notify(void) +#if defined(CONFIG_X86) || defined(CONFIG_IA64) +static int __init set_no_mwait(const struct dmi_system_id *id) { -#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 + pr_notice(PREFIX "%s detected - disabling mwait for CPU C-states\n", + id->ident); + boot_option_idle_override = IDLE_NOMWAIT; + return 0; } -/* - * 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 struct dmi_system_id processor_idle_dmi_table[] __initdata = { + { + set_no_mwait, "Extensa 5220", { + DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_VERSION, "0100"), + DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL}, + {}, +}; -static int __init acpi_processor_init(void) +static void __init processor_dmi_check(void) { - int result = 0; - - ACPI_FUNCTION_TRACE("acpi_processor_init"); - - memset(&processors, 0, sizeof(processors)); - memset(&errata, 0, sizeof(errata)); - - acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir); - if (!acpi_processor_dir) - return_VALUE(0); - acpi_processor_dir->owner = THIS_MODULE; - - result = acpi_bus_register_driver(&acpi_processor_driver); - if (result < 0) { - remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); - return_VALUE(0); - } - - acpi_processor_install_hotplug_notify(); - - acpi_thermal_cpufreq_init(); - - acpi_processor_ppc_init(); - - return_VALUE(0); + /* + * Check whether the system is DMI table. If yes, OSPM + * should not use mwait for CPU-states. + */ + dmi_check_system(processor_idle_dmi_table); } +#else +static inline void processor_dmi_check(void) {} +#endif -static void __exit acpi_processor_exit(void) +void __init acpi_early_processor_set_pdc(void) { - ACPI_FUNCTION_TRACE("acpi_processor_exit"); - - acpi_processor_ppc_exit(); - - acpi_thermal_cpufreq_exit(); + processor_dmi_check(); - acpi_processor_uninstall_hotplug_notify(); - - acpi_bus_unregister_driver(&acpi_processor_driver); - - remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir); - - return_VOID; + acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, + early_init_pdc, NULL, NULL, NULL); + acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL); } - -module_init(acpi_processor_init); -module_exit(acpi_processor_exit); - -EXPORT_SYMBOL(acpi_processor_set_thermal_limit); - -MODULE_ALIAS("processor"); |