48d3d8263c
Revert commit 1192aeb957
("ACPI:
drivers/acpi: elide a non-zero test on a result that is never 0")
because it turns out that thermal_cooling_device_register() does
actually return NULL if CONFIG_THERMAL is turned off (then the routine
turns into a dummy inline routine in the header files that returns NULL
unconditionally).
This was found with randconfig testing, causing a crash during bootup:
initcall 0x78878534 ran for 13 msecs: acpi_button_init+0x0/0x51()
Calling initcall 0x78878585: acpi_fan_init+0x0/0x2c()
BUG: unable to handle kernel NULL pointer dereference at 00000000
IP: [<782b8ad0>] acpi_fan_add+0x7d/0xfd
*pde = 00000000
Oops: 0000 [#1]
Modules linked in:
Pid: 1, comm: swapper Not tainted (2.6.25-rc7-sched-devel.git-x86-latest.git #14)
EIP: 0060:[<782b8ad0>] EFLAGS: 00010246 CPU: 0
EIP is at acpi_fan_add+0x7d/0xfd
EAX: b787c718 EBX: b787c400 ECX: b782ceb4 EDX: 00000007
ESI: 00000000 EDI: b787c6f4 EBP: b782cee0 ESP: b782cecc
DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
Process swapper (pid: 1, ti=b782c000 task=b7846000 task.ti=b782c000)
Stack: b787c459 00000000 b787c400 78790888 b787c60c b782cef8 782b6fb8 ffffffda
b787c60c 00000000 78790958 b782cf0c 783005d7 b787c60c 78790958 78790584
b782cf1c 783007f6 b782cf28 00000000 b782cf40 782ffc4a 78790958 b794d558
Call Trace:
[<782b6fb8>] ? acpi_device_probe+0x3e/0xdb
[<783005d7>] ? driver_probe_device+0x82/0xfc
[<783007f6>] ? __driver_attach+0x3a/0x70
[<782ffc4a>] ? bus_for_each_dev+0x3e/0x60
[<7830048c>] ? driver_attach+0x14/0x16
[<783007bc>] ? __driver_attach+0x0/0x70
[<7830006a>] ? bus_add_driver+0x9d/0x1b0
[<783008c3>] ? driver_register+0x47/0xa3
[<7813db00>] ? timespec_to_ktime+0x9/0xc
[<782b7331>] ? acpi_bus_register_driver+0x3a/0x3c
[<78878592>] ? acpi_fan_init+0xd/0x2c
[<78863656>] ? kernel_init+0xac/0x1f9
[<788635aa>] ? kernel_init+0x0/0x1f9
[<78114563>] ? kernel_thread_helper+0x7/0x10
=======================
Code: 6e 78 e8 57 44 e7 ff 58 e9 93 00 00 00 8b 55 f0 8d bb f4 02 00 00 80 4b 2d 10 8b 03 e8 87 cb ff ff 8d 83 18 03 00 00 80 63 2d ef <ff> 35 00 00 00 00 50 68 e8 9c 6e 78 e8 22 44 e7 ff b9 b6 9c 6e
EIP: [<782b8ad0>] acpi_fan_add+0x7d/0xfd SS:ESP 0068:b782cecc
---[ end trace 778e504de7e3b1e3 ]---
Kernel panic - not syncing: Attempted to kill init!
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1137 lines
28 KiB
C
1137 lines
28 KiB
C
/*
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* acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* TBD:
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* 1. Make # power states dynamic.
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* 2. Support duty_cycle values that span bit 4.
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* 3. Optimize by having scheduler determine business instead of
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* having us try to calculate it here.
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* 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/pm.h>
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#include <linux/cpufreq.h>
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#include <linux/cpu.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/dmi.h>
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#include <linux/moduleparam.h>
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#include <linux/cpuidle.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/cpu.h>
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#include <asm/delay.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <asm/smp.h>
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#include <asm/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/processor.h>
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#define ACPI_PROCESSOR_COMPONENT 0x01000000
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
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#define ACPI_PROCESSOR_FILE_INFO "info"
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#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
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#define ACPI_PROCESSOR_FILE_LIMIT "limit"
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#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
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#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
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#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
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#define ACPI_PROCESSOR_LIMIT_USER 0
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#define ACPI_PROCESSOR_LIMIT_THERMAL 1
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_core");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Processor Driver");
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MODULE_LICENSE("GPL");
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static int acpi_processor_add(struct acpi_device *device);
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static int acpi_processor_start(struct acpi_device *device);
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static int acpi_processor_remove(struct acpi_device *device, int type);
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static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
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static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
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static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
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static int acpi_processor_handle_eject(struct acpi_processor *pr);
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extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
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static const struct acpi_device_id processor_device_ids[] = {
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{ACPI_PROCESSOR_HID, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, processor_device_ids);
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static struct acpi_driver acpi_processor_driver = {
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.name = "processor",
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.class = ACPI_PROCESSOR_CLASS,
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.ids = processor_device_ids,
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.ops = {
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.add = acpi_processor_add,
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.remove = acpi_processor_remove,
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.start = acpi_processor_start,
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.suspend = acpi_processor_suspend,
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.resume = acpi_processor_resume,
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},
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};
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#define INSTALL_NOTIFY_HANDLER 1
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#define UNINSTALL_NOTIFY_HANDLER 2
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static const struct file_operations acpi_processor_info_fops = {
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.open = acpi_processor_info_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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struct acpi_processor *processors[NR_CPUS];
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struct acpi_processor_errata errata __read_mostly;
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/* --------------------------------------------------------------------------
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Errata Handling
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-------------------------------------------------------------------------- */
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static int acpi_processor_errata_piix4(struct pci_dev *dev)
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{
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u8 value1 = 0;
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u8 value2 = 0;
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if (!dev)
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return -EINVAL;
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/*
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* Note that 'dev' references the PIIX4 ACPI Controller.
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*/
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switch (dev->revision) {
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case 0:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
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break;
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case 1:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
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break;
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case 2:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
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break;
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case 3:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
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break;
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}
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switch (dev->revision) {
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case 0: /* PIIX4 A-step */
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case 1: /* PIIX4 B-step */
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/*
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* See specification changes #13 ("Manual Throttle Duty Cycle")
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* and #14 ("Enabling and Disabling Manual Throttle"), plus
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* erratum #5 ("STPCLK# Deassertion Time") from the January
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* 2002 PIIX4 specification update. Applies to only older
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* PIIX4 models.
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*/
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errata.piix4.throttle = 1;
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case 2: /* PIIX4E */
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case 3: /* PIIX4M */
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/*
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* See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
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* Livelock") from the January 2002 PIIX4 specification update.
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* Applies to all PIIX4 models.
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*/
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/*
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* BM-IDE
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* ------
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* Find the PIIX4 IDE Controller and get the Bus Master IDE
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* Status register address. We'll use this later to read
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* each IDE controller's DMA status to make sure we catch all
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* DMA activity.
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*/
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dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB,
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PCI_ANY_ID, PCI_ANY_ID, NULL);
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if (dev) {
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errata.piix4.bmisx = pci_resource_start(dev, 4);
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pci_dev_put(dev);
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}
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/*
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* Type-F DMA
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* ----------
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* Find the PIIX4 ISA Controller and read the Motherboard
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* DMA controller's status to see if Type-F (Fast) DMA mode
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* is enabled (bit 7) on either channel. Note that we'll
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* disable C3 support if this is enabled, as some legacy
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* devices won't operate well if fast DMA is disabled.
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*/
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dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB_0,
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PCI_ANY_ID, PCI_ANY_ID, NULL);
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if (dev) {
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pci_read_config_byte(dev, 0x76, &value1);
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pci_read_config_byte(dev, 0x77, &value2);
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if ((value1 & 0x80) || (value2 & 0x80))
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errata.piix4.fdma = 1;
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pci_dev_put(dev);
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}
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break;
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}
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if (errata.piix4.bmisx)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Bus master activity detection (BM-IDE) erratum enabled\n"));
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if (errata.piix4.fdma)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Type-F DMA livelock erratum (C3 disabled)\n"));
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return 0;
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}
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static int acpi_processor_errata(struct acpi_processor *pr)
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{
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int result = 0;
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struct pci_dev *dev = NULL;
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if (!pr)
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return -EINVAL;
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/*
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* PIIX4
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*/
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dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
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PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
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PCI_ANY_ID, NULL);
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if (dev) {
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result = acpi_processor_errata_piix4(dev);
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pci_dev_put(dev);
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}
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return result;
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}
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/* --------------------------------------------------------------------------
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Common ACPI processor functions
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-------------------------------------------------------------------------- */
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/*
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* _PDC is required for a BIOS-OS handshake for most of the newer
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* ACPI processor features.
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*/
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static int acpi_processor_set_pdc(struct acpi_processor *pr)
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{
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struct acpi_object_list *pdc_in = pr->pdc;
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acpi_status status = AE_OK;
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if (!pdc_in)
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return status;
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status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
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if (ACPI_FAILURE(status))
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Could not evaluate _PDC, using legacy perf. control...\n"));
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return status;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static struct proc_dir_entry *acpi_processor_dir = NULL;
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static int acpi_processor_info_seq_show(struct seq_file *seq, void *offset)
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{
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struct acpi_processor *pr = seq->private;
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if (!pr)
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goto end;
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seq_printf(seq, "processor id: %d\n"
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"acpi id: %d\n"
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"bus mastering control: %s\n"
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"power management: %s\n"
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"throttling control: %s\n"
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"limit interface: %s\n",
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pr->id,
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pr->acpi_id,
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pr->flags.bm_control ? "yes" : "no",
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pr->flags.power ? "yes" : "no",
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pr->flags.throttling ? "yes" : "no",
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pr->flags.limit ? "yes" : "no");
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end:
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return 0;
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}
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static int acpi_processor_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_processor_info_seq_show,
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PDE(inode)->data);
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}
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static int acpi_processor_add_fs(struct acpi_device *device)
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{
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struct proc_dir_entry *entry = NULL;
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if (!acpi_device_dir(device)) {
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acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
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acpi_processor_dir);
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if (!acpi_device_dir(device))
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return -ENODEV;
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}
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acpi_device_dir(device)->owner = THIS_MODULE;
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/* 'info' [R] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_INFO,
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S_IRUGO, acpi_device_dir(device));
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_processor_info_fops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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/* 'throttling' [R/W] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_device_dir(device));
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_processor_throttling_fops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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/* 'limit' [R/W] */
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entry = create_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
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S_IFREG | S_IRUGO | S_IWUSR,
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acpi_device_dir(device));
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if (!entry)
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return -EIO;
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else {
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entry->proc_fops = &acpi_processor_limit_fops;
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entry->data = acpi_driver_data(device);
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entry->owner = THIS_MODULE;
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}
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return 0;
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}
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static int acpi_processor_remove_fs(struct acpi_device *device)
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{
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if (acpi_device_dir(device)) {
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remove_proc_entry(ACPI_PROCESSOR_FILE_INFO,
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acpi_device_dir(device));
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remove_proc_entry(ACPI_PROCESSOR_FILE_THROTTLING,
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acpi_device_dir(device));
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remove_proc_entry(ACPI_PROCESSOR_FILE_LIMIT,
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acpi_device_dir(device));
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remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
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acpi_device_dir(device) = NULL;
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}
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return 0;
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}
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/* Use the acpiid in MADT to map cpus in case of SMP */
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#ifndef CONFIG_SMP
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static int get_cpu_id(acpi_handle handle, u32 acpi_id) {return -1;}
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#else
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static struct acpi_table_madt *madt;
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static int map_lapic_id(struct acpi_subtable_header *entry,
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u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_apic *lapic =
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(struct acpi_madt_local_apic *)entry;
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if ((lapic->lapic_flags & ACPI_MADT_ENABLED) &&
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lapic->processor_id == acpi_id) {
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*apic_id = lapic->id;
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return 1;
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}
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return 0;
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}
|
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|
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static int map_lsapic_id(struct acpi_subtable_header *entry,
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u32 acpi_id, int *apic_id)
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{
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struct acpi_madt_local_sapic *lsapic =
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(struct acpi_madt_local_sapic *)entry;
|
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/* Only check enabled APICs*/
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if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
|
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/* First check against id */
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if (lsapic->processor_id == acpi_id) {
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*apic_id = (lsapic->id << 8) | lsapic->eid;
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return 1;
|
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/* Check against optional uid */
|
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} else if (entry->length >= 16 &&
|
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lsapic->uid == acpi_id) {
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*apic_id = lsapic->uid;
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return 1;
|
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}
|
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}
|
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return 0;
|
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}
|
|
|
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static int map_madt_entry(u32 acpi_id)
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{
|
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unsigned long madt_end, entry;
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int apic_id = -1;
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|
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if (!madt)
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return apic_id;
|
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|
|
entry = (unsigned long)madt;
|
|
madt_end = entry + madt->header.length;
|
|
|
|
/* Parse all entries looking for a match. */
|
|
|
|
entry += sizeof(struct acpi_table_madt);
|
|
while (entry + sizeof(struct acpi_subtable_header) < madt_end) {
|
|
struct acpi_subtable_header *header =
|
|
(struct acpi_subtable_header *)entry;
|
|
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
|
|
if (map_lapic_id(header, acpi_id, &apic_id))
|
|
break;
|
|
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
|
|
if (map_lsapic_id(header, acpi_id, &apic_id))
|
|
break;
|
|
}
|
|
entry += header->length;
|
|
}
|
|
return apic_id;
|
|
}
|
|
|
|
static int map_mat_entry(acpi_handle handle, u32 acpi_id)
|
|
{
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *obj;
|
|
struct acpi_subtable_header *header;
|
|
int apic_id = -1;
|
|
|
|
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
|
|
goto exit;
|
|
|
|
if (!buffer.length || !buffer.pointer)
|
|
goto exit;
|
|
|
|
obj = buffer.pointer;
|
|
if (obj->type != ACPI_TYPE_BUFFER ||
|
|
obj->buffer.length < sizeof(struct acpi_subtable_header)) {
|
|
goto exit;
|
|
}
|
|
|
|
header = (struct acpi_subtable_header *)obj->buffer.pointer;
|
|
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
|
|
map_lapic_id(header, acpi_id, &apic_id);
|
|
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
|
|
map_lsapic_id(header, acpi_id, &apic_id);
|
|
}
|
|
|
|
exit:
|
|
if (buffer.pointer)
|
|
kfree(buffer.pointer);
|
|
return apic_id;
|
|
}
|
|
|
|
static int get_cpu_id(acpi_handle handle, u32 acpi_id)
|
|
{
|
|
int i;
|
|
int apic_id = -1;
|
|
|
|
apic_id = map_mat_entry(handle, acpi_id);
|
|
if (apic_id == -1)
|
|
apic_id = map_madt_entry(acpi_id);
|
|
if (apic_id == -1)
|
|
return apic_id;
|
|
|
|
for_each_possible_cpu(i) {
|
|
if (cpu_physical_id(i) == apic_id)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static int acpi_processor_get_info(struct acpi_processor *pr, unsigned has_uid)
|
|
{
|
|
acpi_status status = 0;
|
|
union acpi_object object = { 0 };
|
|
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
|
|
int cpu_index;
|
|
static int cpu0_initialized;
|
|
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (num_online_cpus() > 1)
|
|
errata.smp = TRUE;
|
|
|
|
acpi_processor_errata(pr);
|
|
|
|
/*
|
|
* Check to see if we have bus mastering arbitration control. This
|
|
* is required for proper C3 usage (to maintain cache coherency).
|
|
*/
|
|
if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
|
|
pr->flags.bm_control = 1;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Bus mastering arbitration control present\n"));
|
|
} else
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"No bus mastering arbitration control\n"));
|
|
|
|
/* Check if it is a Device with HID and UID */
|
|
if (has_uid) {
|
|
unsigned long value;
|
|
status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
|
|
NULL, &value);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Evaluating processor _UID\n");
|
|
return -ENODEV;
|
|
}
|
|
pr->acpi_id = value;
|
|
} else {
|
|
/*
|
|
* Evalute the processor object. Note that it is common on SMP to
|
|
* have the first (boot) processor with a valid PBLK address while
|
|
* all others have a NULL address.
|
|
*/
|
|
status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Evaluating processor object\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
|
|
* >>> 'acpi_get_processor_id(acpi_id, &id)' in arch/xxx/acpi.c
|
|
*/
|
|
pr->acpi_id = object.processor.proc_id;
|
|
}
|
|
cpu_index = get_cpu_id(pr->handle, pr->acpi_id);
|
|
|
|
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
|
|
if (!cpu0_initialized && (cpu_index == -1) &&
|
|
(num_online_cpus() == 1)) {
|
|
cpu_index = 0;
|
|
}
|
|
|
|
cpu0_initialized = 1;
|
|
|
|
pr->id = cpu_index;
|
|
|
|
/*
|
|
* Extra Processor objects may be enumerated on MP systems with
|
|
* less than the max # of CPUs. They should be ignored _iff
|
|
* they are physically not present.
|
|
*/
|
|
if (pr->id == -1) {
|
|
if (ACPI_FAILURE
|
|
(acpi_processor_hotadd_init(pr->handle, &pr->id))) {
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
|
|
pr->acpi_id));
|
|
|
|
if (!object.processor.pblk_address)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
|
|
else if (object.processor.pblk_length != 6)
|
|
printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
|
|
object.processor.pblk_length);
|
|
else {
|
|
pr->throttling.address = object.processor.pblk_address;
|
|
pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
|
|
pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
|
|
|
|
pr->pblk = object.processor.pblk_address;
|
|
|
|
/*
|
|
* We don't care about error returns - we just try to mark
|
|
* these reserved so that nobody else is confused into thinking
|
|
* that this region might be unused..
|
|
*
|
|
* (In particular, allocating the IO range for Cardbus)
|
|
*/
|
|
request_region(pr->throttling.address, 6, "ACPI CPU throttle");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *processor_device_array[NR_CPUS];
|
|
|
|
static int __cpuinit acpi_processor_start(struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
acpi_status status = AE_OK;
|
|
struct acpi_processor *pr;
|
|
|
|
|
|
pr = acpi_driver_data(device);
|
|
|
|
result = acpi_processor_get_info(pr, device->flags.unique_id);
|
|
if (result) {
|
|
/* Processor is physically not present */
|
|
return 0;
|
|
}
|
|
|
|
BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
|
|
|
|
/*
|
|
* Buggy BIOS check
|
|
* ACPI id of processors can be reported wrongly by the BIOS.
|
|
* Don't trust it blindly
|
|
*/
|
|
if (processor_device_array[pr->id] != NULL &&
|
|
processor_device_array[pr->id] != device) {
|
|
printk(KERN_WARNING "BIOS reported wrong ACPI id "
|
|
"for the processor\n");
|
|
return -ENODEV;
|
|
}
|
|
processor_device_array[pr->id] = device;
|
|
|
|
processors[pr->id] = pr;
|
|
|
|
result = acpi_processor_add_fs(device);
|
|
if (result)
|
|
goto end;
|
|
|
|
status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_processor_notify, pr);
|
|
|
|
/* _PDC call should be done before doing anything else (if reqd.). */
|
|
arch_acpi_processor_init_pdc(pr);
|
|
acpi_processor_set_pdc(pr);
|
|
#ifdef CONFIG_CPU_FREQ
|
|
acpi_processor_ppc_has_changed(pr);
|
|
#endif
|
|
acpi_processor_get_throttling_info(pr);
|
|
acpi_processor_get_limit_info(pr);
|
|
|
|
|
|
acpi_processor_power_init(pr, device);
|
|
|
|
pr->cdev = thermal_cooling_device_register("Processor", device,
|
|
&processor_cooling_ops);
|
|
if (IS_ERR(pr->cdev)) {
|
|
result = PTR_ERR(pr->cdev);
|
|
goto end;
|
|
}
|
|
if (pr->cdev) {
|
|
printk(KERN_INFO PREFIX
|
|
"%s is registered as cooling_device%d\n",
|
|
device->dev.bus_id, pr->cdev->id);
|
|
|
|
result = sysfs_create_link(&device->dev.kobj,
|
|
&pr->cdev->device.kobj,
|
|
"thermal_cooling");
|
|
if (result)
|
|
return result;
|
|
result = sysfs_create_link(&pr->cdev->device.kobj,
|
|
&device->dev.kobj,
|
|
"device");
|
|
if (result)
|
|
return result;
|
|
}
|
|
|
|
if (pr->flags.throttling) {
|
|
printk(KERN_INFO PREFIX "%s [%s] (supports",
|
|
acpi_device_name(device), acpi_device_bid(device));
|
|
printk(" %d throttling states", pr->throttling.state_count);
|
|
printk(")\n");
|
|
}
|
|
|
|
end:
|
|
|
|
return result;
|
|
}
|
|
|
|
static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
struct acpi_processor *pr = data;
|
|
struct acpi_device *device = NULL;
|
|
int saved;
|
|
|
|
if (!pr)
|
|
return;
|
|
|
|
if (acpi_bus_get_device(pr->handle, &device))
|
|
return;
|
|
|
|
switch (event) {
|
|
case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
|
|
saved = pr->performance_platform_limit;
|
|
acpi_processor_ppc_has_changed(pr);
|
|
if (saved == pr->performance_platform_limit)
|
|
break;
|
|
acpi_bus_generate_proc_event(device, event,
|
|
pr->performance_platform_limit);
|
|
acpi_bus_generate_netlink_event(device->pnp.device_class,
|
|
device->dev.bus_id, event,
|
|
pr->performance_platform_limit);
|
|
break;
|
|
case ACPI_PROCESSOR_NOTIFY_POWER:
|
|
acpi_processor_cst_has_changed(pr);
|
|
acpi_bus_generate_proc_event(device, event, 0);
|
|
acpi_bus_generate_netlink_event(device->pnp.device_class,
|
|
device->dev.bus_id, event, 0);
|
|
break;
|
|
case ACPI_PROCESSOR_NOTIFY_THROTTLING:
|
|
acpi_processor_tstate_has_changed(pr);
|
|
acpi_bus_generate_proc_event(device, event, 0);
|
|
acpi_bus_generate_netlink_event(device->pnp.device_class,
|
|
device->dev.bus_id, event, 0);
|
|
default:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Unsupported event [0x%x]\n", event));
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static int acpi_cpu_soft_notify(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
struct acpi_processor *pr = processors[cpu];
|
|
|
|
if (action == CPU_ONLINE && pr) {
|
|
acpi_processor_ppc_has_changed(pr);
|
|
acpi_processor_cst_has_changed(pr);
|
|
acpi_processor_tstate_has_changed(pr);
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block acpi_cpu_notifier =
|
|
{
|
|
.notifier_call = acpi_cpu_soft_notify,
|
|
};
|
|
|
|
static int acpi_processor_add(struct acpi_device *device)
|
|
{
|
|
struct acpi_processor *pr = NULL;
|
|
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
|
|
if (!pr)
|
|
return -ENOMEM;
|
|
|
|
pr->handle = device->handle;
|
|
strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
|
|
acpi_driver_data(device) = pr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_remove(struct acpi_device *device, int type)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_processor *pr = NULL;
|
|
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return -EINVAL;
|
|
|
|
pr = acpi_driver_data(device);
|
|
|
|
if (pr->id >= nr_cpu_ids) {
|
|
kfree(pr);
|
|
return 0;
|
|
}
|
|
|
|
if (type == ACPI_BUS_REMOVAL_EJECT) {
|
|
if (acpi_processor_handle_eject(pr))
|
|
return -EINVAL;
|
|
}
|
|
|
|
acpi_processor_power_exit(pr, device);
|
|
|
|
status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_processor_notify);
|
|
|
|
acpi_processor_remove_fs(device);
|
|
|
|
if (pr->cdev) {
|
|
sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
|
|
sysfs_remove_link(&pr->cdev->device.kobj, "device");
|
|
thermal_cooling_device_unregister(pr->cdev);
|
|
pr->cdev = NULL;
|
|
}
|
|
|
|
processors[pr->id] = NULL;
|
|
|
|
kfree(pr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
/****************************************************************************
|
|
* Acpi processor hotplug support *
|
|
****************************************************************************/
|
|
|
|
static int is_processor_present(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
unsigned long sta = 0;
|
|
|
|
|
|
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
|
|
|
|
if (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;
|
|
struct acpi_processor *pr;
|
|
|
|
|
|
if (acpi_get_parent(handle, &phandle)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (acpi_bus_get_device(phandle, &pdev)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
acpi_bus_start(*device);
|
|
|
|
pr = acpi_driver_data(*device);
|
|
if (!pr)
|
|
return -ENODEV;
|
|
|
|
if ((pr->id >= 0) && (pr->id < nr_cpu_ids)) {
|
|
kobject_uevent(&(*device)->dev.kobj, KOBJ_ONLINE);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __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;
|
|
}
|
|
|
|
pr = acpi_driver_data(device);
|
|
if (!pr) {
|
|
printk(KERN_ERR PREFIX "Driver data is NULL\n");
|
|
break;
|
|
}
|
|
|
|
if (pr->id >= 0 && (pr->id < nr_cpu_ids)) {
|
|
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
|
|
break;
|
|
}
|
|
|
|
result = acpi_processor_start(device);
|
|
if ((!result) && ((pr->id >= 0) && (pr->id < nr_cpu_ids))) {
|
|
kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
|
|
} else {
|
|
printk(KERN_ERR PREFIX "Device [%s] failed to start\n",
|
|
acpi_device_bid(device));
|
|
}
|
|
break;
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"received ACPI_NOTIFY_EJECT_REQUEST\n"));
|
|
|
|
if (acpi_bus_get_device(handle, &device)) {
|
|
printk(KERN_ERR PREFIX
|
|
"Device don't exist, dropping EJECT\n");
|
|
break;
|
|
}
|
|
pr = acpi_driver_data(device);
|
|
if (!pr) {
|
|
printk(KERN_ERR PREFIX
|
|
"Driver data is NULL, dropping EJECT\n");
|
|
return;
|
|
}
|
|
|
|
if ((pr->id < nr_cpu_ids) && (cpu_present(pr->id)))
|
|
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
|
|
break;
|
|
default:
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Unsupported event [0x%x]\n", event));
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static acpi_status
|
|
processor_walk_namespace_cb(acpi_handle handle,
|
|
u32 lvl, void *context, void **rv)
|
|
{
|
|
acpi_status status;
|
|
int *action = context;
|
|
acpi_object_type type = 0;
|
|
|
|
status = acpi_get_type(handle, &type);
|
|
if (ACPI_FAILURE(status))
|
|
return (AE_OK);
|
|
|
|
if (type != ACPI_TYPE_PROCESSOR)
|
|
return (AE_OK);
|
|
|
|
switch (*action) {
|
|
case INSTALL_NOTIFY_HANDLER:
|
|
acpi_install_notify_handler(handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
acpi_processor_hotplug_notify,
|
|
NULL);
|
|
break;
|
|
case UNINSTALL_NOTIFY_HANDLER:
|
|
acpi_remove_notify_handler(handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
acpi_processor_hotplug_notify);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return (AE_OK);
|
|
}
|
|
|
|
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
|
|
{
|
|
|
|
if (!is_processor_present(handle)) {
|
|
return AE_ERROR;
|
|
}
|
|
|
|
if (acpi_map_lsapic(handle, p_cpu))
|
|
return AE_ERROR;
|
|
|
|
if (arch_register_cpu(*p_cpu)) {
|
|
acpi_unmap_lsapic(*p_cpu);
|
|
return AE_ERROR;
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_processor_handle_eject(struct acpi_processor *pr)
|
|
{
|
|
if (cpu_online(pr->id)) {
|
|
return (-EINVAL);
|
|
}
|
|
arch_unregister_cpu(pr->id);
|
|
acpi_unmap_lsapic(pr->id);
|
|
return (0);
|
|
}
|
|
#else
|
|
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
|
|
{
|
|
return AE_ERROR;
|
|
}
|
|
static int acpi_processor_handle_eject(struct acpi_processor *pr)
|
|
{
|
|
return (-EINVAL);
|
|
}
|
|
#endif
|
|
|
|
static
|
|
void acpi_processor_install_hotplug_notify(void)
|
|
{
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
int action = INSTALL_NOTIFY_HANDLER;
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
|
|
ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
processor_walk_namespace_cb, &action, NULL);
|
|
#endif
|
|
register_hotcpu_notifier(&acpi_cpu_notifier);
|
|
}
|
|
|
|
static
|
|
void acpi_processor_uninstall_hotplug_notify(void)
|
|
{
|
|
#ifdef CONFIG_ACPI_HOTPLUG_CPU
|
|
int action = UNINSTALL_NOTIFY_HANDLER;
|
|
acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
|
|
ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX,
|
|
processor_walk_namespace_cb, &action, NULL);
|
|
#endif
|
|
unregister_hotcpu_notifier(&acpi_cpu_notifier);
|
|
}
|
|
|
|
/*
|
|
* We keep the driver loaded even when ACPI is not running.
|
|
* This is needed for the powernow-k8 driver, that works even without
|
|
* ACPI, but needs symbols from this driver
|
|
*/
|
|
|
|
static int __init acpi_processor_init(void)
|
|
{
|
|
int result = 0;
|
|
|
|
|
|
memset(&processors, 0, sizeof(processors));
|
|
memset(&errata, 0, sizeof(errata));
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
|
|
(struct acpi_table_header **)&madt)))
|
|
madt = NULL;
|
|
#endif
|
|
|
|
acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
|
|
if (!acpi_processor_dir)
|
|
return -ENOMEM;
|
|
acpi_processor_dir->owner = THIS_MODULE;
|
|
|
|
result = cpuidle_register_driver(&acpi_idle_driver);
|
|
if (result < 0)
|
|
goto out_proc;
|
|
|
|
result = acpi_bus_register_driver(&acpi_processor_driver);
|
|
if (result < 0)
|
|
goto out_cpuidle;
|
|
|
|
acpi_processor_install_hotplug_notify();
|
|
|
|
acpi_thermal_cpufreq_init();
|
|
|
|
acpi_processor_ppc_init();
|
|
|
|
acpi_processor_throttling_init();
|
|
|
|
return 0;
|
|
|
|
out_cpuidle:
|
|
cpuidle_unregister_driver(&acpi_idle_driver);
|
|
|
|
out_proc:
|
|
remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void __exit acpi_processor_exit(void)
|
|
{
|
|
acpi_processor_ppc_exit();
|
|
|
|
acpi_thermal_cpufreq_exit();
|
|
|
|
acpi_processor_uninstall_hotplug_notify();
|
|
|
|
acpi_bus_unregister_driver(&acpi_processor_driver);
|
|
|
|
cpuidle_unregister_driver(&acpi_idle_driver);
|
|
|
|
remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
|
|
|
|
return;
|
|
}
|
|
|
|
module_init(acpi_processor_init);
|
|
module_exit(acpi_processor_exit);
|
|
|
|
EXPORT_SYMBOL(acpi_processor_set_thermal_limit);
|
|
|
|
MODULE_ALIAS("processor");
|