2005-04-17 00:20:36 +02:00
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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2006-01-18 18:37:07 +01:00
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* Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
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2005-04-17 00:20:36 +02:00
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*/
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2006-01-15 19:10:39 +01:00
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#include <linux/linkage.h>
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2005-04-17 00:20:36 +02:00
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#include <linux/init.h>
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#include <linux/ds1286.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/notifier.h>
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2006-01-18 18:37:07 +01:00
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#include <linux/pm.h>
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2005-04-17 00:20:36 +02:00
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#include <linux/timer.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/reboot.h>
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#include <asm/sgialib.h>
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#include <asm/sgi/ioc.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/mc.h>
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#include <asm/sgi/ip22.h>
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/*
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* Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
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* I'm not sure if this feature is a good idea, for now it's here just to
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* make the power button make behave just like under IRIX.
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*/
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#define POWERDOWN_TIMEOUT 120
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/*
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2006-06-26 18:30:00 +02:00
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* Blink frequency during reboot grace period and when panicked.
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2005-04-17 00:20:36 +02:00
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*/
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#define POWERDOWN_FREQ (HZ / 4)
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#define PANIC_FREQ (HZ / 8)
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static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;
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#define MACHINE_PANICED 1
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#define MACHINE_SHUTTING_DOWN 2
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2006-01-15 19:10:39 +01:00
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static int machine_state;
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2005-04-17 00:20:36 +02:00
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2007-05-25 20:32:28 +02:00
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static void __noreturn sgi_machine_power_off(void)
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2005-04-17 00:20:36 +02:00
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{
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unsigned int tmp;
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local_irq_disable();
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/* Disable watchdog */
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tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
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hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
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hpc3c0->rtcregs[RTC_WSEC] = 0;
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hpc3c0->rtcregs[RTC_WHSEC] = 0;
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while (1) {
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sgioc->panel = ~SGIOC_PANEL_POWERON;
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/* Good bye cruel world ... */
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/* If we're still running, we probably got sent an alarm
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interrupt. Read the flag to clear it. */
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tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
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}
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}
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2007-05-25 20:32:28 +02:00
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static void __noreturn sgi_machine_restart(char *command)
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2006-01-15 19:10:39 +01:00
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{
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if (machine_state & MACHINE_SHUTTING_DOWN)
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sgi_machine_power_off();
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sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
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while (1);
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}
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2007-05-25 20:32:28 +02:00
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static void __noreturn sgi_machine_halt(void)
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2006-01-15 19:10:39 +01:00
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{
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if (machine_state & MACHINE_SHUTTING_DOWN)
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sgi_machine_power_off();
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ArcEnterInteractiveMode();
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}
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2005-04-17 00:20:36 +02:00
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static void power_timeout(unsigned long data)
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{
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sgi_machine_power_off();
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}
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static void blink_timeout(unsigned long data)
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{
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/* XXX fix this for fullhouse */
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sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
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sgioc->reset = sgi_ioc_reset;
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2006-01-15 19:10:39 +01:00
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mod_timer(&blink_timer, jiffies + data);
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2005-04-17 00:20:36 +02:00
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}
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static void debounce(unsigned long data)
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{
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del_timer(&debounce_timer);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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/* Interrupt still being sent. */
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2006-01-15 19:10:39 +01:00
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debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
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2005-04-17 00:20:36 +02:00
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add_timer(&debounce_timer);
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sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
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SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
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SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
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return;
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}
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if (machine_state & MACHINE_PANICED)
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sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
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enable_irq(SGI_PANEL_IRQ);
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}
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static inline void power_button(void)
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{
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if (machine_state & MACHINE_PANICED)
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return;
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2006-10-02 11:19:00 +02:00
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if ((machine_state & MACHINE_SHUTTING_DOWN) ||
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kill_cad_pid(SIGINT, 1)) {
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2005-04-17 00:20:36 +02:00
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/* No init process or button pressed twice. */
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sgi_machine_power_off();
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}
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machine_state |= MACHINE_SHUTTING_DOWN;
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blink_timer.data = POWERDOWN_FREQ;
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blink_timeout(POWERDOWN_FREQ);
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init_timer(&power_timer);
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power_timer.function = power_timeout;
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power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
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add_timer(&power_timer);
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}
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void (*indy_volume_button)(int) = NULL;
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EXPORT_SYMBOL(indy_volume_button);
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static inline void volume_up_button(unsigned long data)
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{
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del_timer(&volume_timer);
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if (indy_volume_button)
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indy_volume_button(1);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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2006-01-15 19:10:39 +01:00
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volume_timer.expires = jiffies + (HZ / 100);
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2005-04-17 00:20:36 +02:00
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add_timer(&volume_timer);
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}
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}
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static inline void volume_down_button(unsigned long data)
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{
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del_timer(&volume_timer);
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if (indy_volume_button)
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indy_volume_button(-1);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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2006-01-15 19:10:39 +01:00
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volume_timer.expires = jiffies + (HZ / 100);
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2005-04-17 00:20:36 +02:00
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add_timer(&volume_timer);
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}
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}
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:55:46 +02:00
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static irqreturn_t panel_int(int irq, void *dev_id)
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2005-04-17 00:20:36 +02:00
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{
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unsigned int buttons;
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buttons = sgioc->panel;
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sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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/* Wait until interrupt goes away */
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disable_irq(SGI_PANEL_IRQ);
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init_timer(&debounce_timer);
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debounce_timer.function = debounce;
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debounce_timer.expires = jiffies + 5;
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add_timer(&debounce_timer);
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}
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2005-09-04 00:56:17 +02:00
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/* Power button was pressed
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2005-04-17 00:20:36 +02:00
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* ioc.ps page 22: "The Panel Register is called Power Control by Full
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* House. Only lowest 2 bits are used. Guiness uses upper four bits
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* for volume control". This is not true, all bits are pulled high
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* on fullhouse */
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if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
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power_button();
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return IRQ_HANDLED;
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}
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/* TODO: mute/unmute */
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/* Volume up button was pressed */
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if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
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init_timer(&volume_timer);
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volume_timer.function = volume_up_button;
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2006-01-15 19:10:39 +01:00
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volume_timer.expires = jiffies + (HZ / 100);
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2005-04-17 00:20:36 +02:00
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add_timer(&volume_timer);
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}
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/* Volume down button was pressed */
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if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
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init_timer(&volume_timer);
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volume_timer.function = volume_down_button;
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2006-01-15 19:10:39 +01:00
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volume_timer.expires = jiffies + (HZ / 100);
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2005-04-17 00:20:36 +02:00
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add_timer(&volume_timer);
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}
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return IRQ_HANDLED;
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}
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static int panic_event(struct notifier_block *this, unsigned long event,
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void *ptr)
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{
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if (machine_state & MACHINE_PANICED)
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return NOTIFY_DONE;
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machine_state |= MACHINE_PANICED;
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blink_timer.data = PANIC_FREQ;
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blink_timeout(PANIC_FREQ);
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return NOTIFY_DONE;
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}
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static struct notifier_block panic_block = {
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.notifier_call = panic_event,
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};
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static int __init reboot_setup(void)
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{
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2007-10-15 00:04:27 +02:00
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int res;
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2005-04-17 00:20:36 +02:00
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_machine_restart = sgi_machine_restart;
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_machine_halt = sgi_machine_halt;
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2006-01-18 18:37:07 +01:00
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pm_power_off = sgi_machine_power_off;
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2005-04-17 00:20:36 +02:00
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2007-10-15 00:04:27 +02:00
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res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
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if (res) {
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printk(KERN_ERR "Allocation of front panel IRQ failed\n");
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return res;
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}
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2005-04-17 00:20:36 +02:00
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init_timer(&blink_timer);
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blink_timer.function = blink_timeout;
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[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 11:16:30 +02:00
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atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
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2005-04-17 00:20:36 +02:00
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return 0;
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}
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subsys_initcall(reboot_setup);
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