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linux_dsm_epyc7002/arch/i386/kernel/io_apic.c
Andi Kleen d15512f442 [PATCH] i386: Fix race in IO-APIC routing entry setup. 
Interrupt could happen between setting the IO-APIC entry
and setting its interrupt data.

Pointed out by Linus.

Signed-off-by: Andi Kleen <ak@suse.de>
2006-12-07 02:14:07 +01:00

2896 lines
71 KiB
C
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/*
* Intel IO-APIC support for multi-Pentium hosts.
*
* Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar, Hajnalka Szabo
*
* Many thanks to Stig Venaas for trying out countless experimental
* patches and reporting/debugging problems patiently!
*
* (c) 1999, Multiple IO-APIC support, developed by
* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
* further tested and cleaned up by Zach Brown <zab@redhat.com>
* and Ingo Molnar <mingo@redhat.com>
*
* Fixes
* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
* thanks to Eric Gilmore
* and Rolf G. Tews
* for testing these extensively
* Paul Diefenbaugh : Added full ACPI support
*/
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/mc146818rtc.h>
#include <linux/compiler.h>
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/sysdev.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/htirq.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/desc.h>
#include <asm/timer.h>
#include <asm/i8259.h>
#include <asm/nmi.h>
#include <asm/msidef.h>
#include <asm/hypertransport.h>
#include <mach_apic.h>
#include <mach_apicdef.h>
#include "io_ports.h"
int (*ioapic_renumber_irq)(int ioapic, int irq);
atomic_t irq_mis_count;
/* Where if anywhere is the i8259 connect in external int mode */
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
static DEFINE_SPINLOCK(ioapic_lock);
static DEFINE_SPINLOCK(vector_lock);
int timer_over_8254 __initdata = 1;
/*
* Is the SiS APIC rmw bug present ?
* -1 = don't know, 0 = no, 1 = yes
*/
int sis_apic_bug = -1;
/*
* # of IRQ routing registers
*/
int nr_ioapic_registers[MAX_IO_APICS];
static int disable_timer_pin_1 __initdata;
/*
* Rough estimation of how many shared IRQs there are, can
* be changed anytime.
*/
#define MAX_PLUS_SHARED_IRQS NR_IRQS
#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
/*
* This is performance-critical, we want to do it O(1)
*
* the indexing order of this array favors 1:1 mappings
* between pins and IRQs.
*/
static struct irq_pin_list {
int apic, pin, next;
} irq_2_pin[PIN_MAP_SIZE];
struct io_apic {
unsigned int index;
unsigned int unused[3];
unsigned int data;
};
static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
{
return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
+ (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK);
}
static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
{
struct io_apic __iomem *io_apic = io_apic_base(apic);
writel(reg, &io_apic->index);
return readl(&io_apic->data);
}
static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
{
struct io_apic __iomem *io_apic = io_apic_base(apic);
writel(reg, &io_apic->index);
writel(value, &io_apic->data);
}
/*
* Re-write a value: to be used for read-modify-write
* cycles where the read already set up the index register.
*
* Older SiS APIC requires we rewrite the index register
*/
static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
{
volatile struct io_apic *io_apic = io_apic_base(apic);
if (sis_apic_bug)
writel(reg, &io_apic->index);
writel(value, &io_apic->data);
}
union entry_union {
struct { u32 w1, w2; };
struct IO_APIC_route_entry entry;
};
static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
{
union entry_union eu;
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
spin_unlock_irqrestore(&ioapic_lock, flags);
return eu.entry;
}
/*
* When we write a new IO APIC routing entry, we need to write the high
* word first! If the mask bit in the low word is clear, we will enable
* the interrupt, and we need to make sure the entry is fully populated
* before that happens.
*/
static void
__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
union entry_union eu;
eu.entry = e;
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
}
static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
__ioapic_write_entry(apic, pin, e);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* When we mask an IO APIC routing entry, we need to write the low
* word first, in order to set the mask bit before we change the
* high bits!
*/
static void ioapic_mask_entry(int apic, int pin)
{
unsigned long flags;
union entry_union eu = { .entry.mask = 1 };
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
* shared ISA-space IRQs, so we have to support them. We are super
* fast in the common case, and fast for shared ISA-space IRQs.
*/
static void add_pin_to_irq(unsigned int irq, int apic, int pin)
{
static int first_free_entry = NR_IRQS;
struct irq_pin_list *entry = irq_2_pin + irq;
while (entry->next)
entry = irq_2_pin + entry->next;
if (entry->pin != -1) {
entry->next = first_free_entry;
entry = irq_2_pin + entry->next;
if (++first_free_entry >= PIN_MAP_SIZE)
panic("io_apic.c: whoops");
}
entry->apic = apic;
entry->pin = pin;
}
/*
* Reroute an IRQ to a different pin.
*/
static void __init replace_pin_at_irq(unsigned int irq,
int oldapic, int oldpin,
int newapic, int newpin)
{
struct irq_pin_list *entry = irq_2_pin + irq;
while (1) {
if (entry->apic == oldapic && entry->pin == oldpin) {
entry->apic = newapic;
entry->pin = newpin;
}
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
}
}
static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable)
{
struct irq_pin_list *entry = irq_2_pin + irq;
unsigned int pin, reg;
for (;;) {
pin = entry->pin;
if (pin == -1)
break;
reg = io_apic_read(entry->apic, 0x10 + pin*2);
reg &= ~disable;
reg |= enable;
io_apic_modify(entry->apic, 0x10 + pin*2, reg);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
}
}
/* mask = 1 */
static void __mask_IO_APIC_irq (unsigned int irq)
{
__modify_IO_APIC_irq(irq, 0x00010000, 0);
}
/* mask = 0 */
static void __unmask_IO_APIC_irq (unsigned int irq)
{
__modify_IO_APIC_irq(irq, 0, 0x00010000);
}
/* mask = 1, trigger = 0 */
static void __mask_and_edge_IO_APIC_irq (unsigned int irq)
{
__modify_IO_APIC_irq(irq, 0x00010000, 0x00008000);
}
/* mask = 0, trigger = 1 */
static void __unmask_and_level_IO_APIC_irq (unsigned int irq)
{
__modify_IO_APIC_irq(irq, 0x00008000, 0x00010000);
}
static void mask_IO_APIC_irq (unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
__mask_IO_APIC_irq(irq);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
static void unmask_IO_APIC_irq (unsigned int irq)
{
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
__unmask_IO_APIC_irq(irq);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
{
struct IO_APIC_route_entry entry;
/* Check delivery_mode to be sure we're not clearing an SMI pin */
entry = ioapic_read_entry(apic, pin);
if (entry.delivery_mode == dest_SMI)
return;
/*
* Disable it in the IO-APIC irq-routing table:
*/
ioapic_mask_entry(apic, pin);
}
static void clear_IO_APIC (void)
{
int apic, pin;
for (apic = 0; apic < nr_ioapics; apic++)
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
clear_IO_APIC_pin(apic, pin);
}
#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
{
unsigned long flags;
int pin;
struct irq_pin_list *entry = irq_2_pin + irq;
unsigned int apicid_value;
cpumask_t tmp;
cpus_and(tmp, cpumask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(cpumask, tmp, CPU_MASK_ALL);
apicid_value = cpu_mask_to_apicid(cpumask);
/* Prepare to do the io_apic_write */
apicid_value = apicid_value << 24;
spin_lock_irqsave(&ioapic_lock, flags);
for (;;) {
pin = entry->pin;
if (pin == -1)
break;
io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
}
set_native_irq_info(irq, cpumask);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
#if defined(CONFIG_IRQBALANCE)
# include <asm/processor.h> /* kernel_thread() */
# include <linux/kernel_stat.h> /* kstat */
# include <linux/slab.h> /* kmalloc() */
# include <linux/timer.h> /* time_after() */
#ifdef CONFIG_BALANCED_IRQ_DEBUG
# define TDprintk(x...) do { printk("<%ld:%s:%d>: ", jiffies, __FILE__, __LINE__); printk(x); } while (0)
# define Dprintk(x...) do { TDprintk(x); } while (0)
# else
# define TDprintk(x...)
# define Dprintk(x...)
# endif
#define IRQBALANCE_CHECK_ARCH -999
#define MAX_BALANCED_IRQ_INTERVAL (5*HZ)
#define MIN_BALANCED_IRQ_INTERVAL (HZ/2)
#define BALANCED_IRQ_MORE_DELTA (HZ/10)
#define BALANCED_IRQ_LESS_DELTA (HZ)
static int irqbalance_disabled __read_mostly = IRQBALANCE_CHECK_ARCH;
static int physical_balance __read_mostly;
static long balanced_irq_interval __read_mostly = MAX_BALANCED_IRQ_INTERVAL;
static struct irq_cpu_info {
unsigned long * last_irq;
unsigned long * irq_delta;
unsigned long irq;
} irq_cpu_data[NR_CPUS];
#define CPU_IRQ(cpu) (irq_cpu_data[cpu].irq)
#define LAST_CPU_IRQ(cpu,irq) (irq_cpu_data[cpu].last_irq[irq])
#define IRQ_DELTA(cpu,irq) (irq_cpu_data[cpu].irq_delta[irq])
#define IDLE_ENOUGH(cpu,now) \
(idle_cpu(cpu) && ((now) - per_cpu(irq_stat, (cpu)).idle_timestamp > 1))
#define IRQ_ALLOWED(cpu, allowed_mask) cpu_isset(cpu, allowed_mask)
#define CPU_TO_PACKAGEINDEX(i) (first_cpu(cpu_sibling_map[i]))
static cpumask_t balance_irq_affinity[NR_IRQS] = {
[0 ... NR_IRQS-1] = CPU_MASK_ALL
};
void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
{
balance_irq_affinity[irq] = mask;
}
static unsigned long move(int curr_cpu, cpumask_t allowed_mask,
unsigned long now, int direction)
{
int search_idle = 1;
int cpu = curr_cpu;
goto inside;
do {
if (unlikely(cpu == curr_cpu))
search_idle = 0;
inside:
if (direction == 1) {
cpu++;
if (cpu >= NR_CPUS)
cpu = 0;
} else {
cpu--;
if (cpu == -1)
cpu = NR_CPUS-1;
}
} while (!cpu_online(cpu) || !IRQ_ALLOWED(cpu,allowed_mask) ||
(search_idle && !IDLE_ENOUGH(cpu,now)));
return cpu;
}
static inline void balance_irq(int cpu, int irq)
{
unsigned long now = jiffies;
cpumask_t allowed_mask;
unsigned int new_cpu;
if (irqbalance_disabled)
return;
cpus_and(allowed_mask, cpu_online_map, balance_irq_affinity[irq]);
new_cpu = move(cpu, allowed_mask, now, 1);
if (cpu != new_cpu) {
set_pending_irq(irq, cpumask_of_cpu(new_cpu));
}
}
static inline void rotate_irqs_among_cpus(unsigned long useful_load_threshold)
{
int i, j;
Dprintk("Rotating IRQs among CPUs.\n");
for_each_online_cpu(i) {
for (j = 0; j < NR_IRQS; j++) {
if (!irq_desc[j].action)
continue;
/* Is it a significant load ? */
if (IRQ_DELTA(CPU_TO_PACKAGEINDEX(i),j) <
useful_load_threshold)
continue;
balance_irq(i, j);
}
}
balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
return;
}
static void do_irq_balance(void)
{
int i, j;
unsigned long max_cpu_irq = 0, min_cpu_irq = (~0);
unsigned long move_this_load = 0;
int max_loaded = 0, min_loaded = 0;
int load;
unsigned long useful_load_threshold = balanced_irq_interval + 10;
int selected_irq;
int tmp_loaded, first_attempt = 1;
unsigned long tmp_cpu_irq;
unsigned long imbalance = 0;
cpumask_t allowed_mask, target_cpu_mask, tmp;
for_each_possible_cpu(i) {
int package_index;
CPU_IRQ(i) = 0;
if (!cpu_online(i))
continue;
package_index = CPU_TO_PACKAGEINDEX(i);
for (j = 0; j < NR_IRQS; j++) {
unsigned long value_now, delta;
/* Is this an active IRQ? */
if (!irq_desc[j].action)
continue;
if ( package_index == i )
IRQ_DELTA(package_index,j) = 0;
/* Determine the total count per processor per IRQ */
value_now = (unsigned long) kstat_cpu(i).irqs[j];
/* Determine the activity per processor per IRQ */
delta = value_now - LAST_CPU_IRQ(i,j);
/* Update last_cpu_irq[][] for the next time */
LAST_CPU_IRQ(i,j) = value_now;
/* Ignore IRQs whose rate is less than the clock */
if (delta < useful_load_threshold)
continue;
/* update the load for the processor or package total */
IRQ_DELTA(package_index,j) += delta;
/* Keep track of the higher numbered sibling as well */
if (i != package_index)
CPU_IRQ(i) += delta;
/*
* We have sibling A and sibling B in the package
*
* cpu_irq[A] = load for cpu A + load for cpu B
* cpu_irq[B] = load for cpu B
*/
CPU_IRQ(package_index) += delta;
}
}
/* Find the least loaded processor package */
for_each_online_cpu(i) {
if (i != CPU_TO_PACKAGEINDEX(i))
continue;
if (min_cpu_irq > CPU_IRQ(i)) {
min_cpu_irq = CPU_IRQ(i);
min_loaded = i;
}
}
max_cpu_irq = ULONG_MAX;
tryanothercpu:
/* Look for heaviest loaded processor.
* We may come back to get the next heaviest loaded processor.
* Skip processors with trivial loads.
*/
tmp_cpu_irq = 0;
tmp_loaded = -1;
for_each_online_cpu(i) {
if (i != CPU_TO_PACKAGEINDEX(i))
continue;
if (max_cpu_irq <= CPU_IRQ(i))
continue;
if (tmp_cpu_irq < CPU_IRQ(i)) {
tmp_cpu_irq = CPU_IRQ(i);
tmp_loaded = i;
}
}
if (tmp_loaded == -1) {
/* In the case of small number of heavy interrupt sources,
* loading some of the cpus too much. We use Ingo's original
* approach to rotate them around.
*/
if (!first_attempt && imbalance >= useful_load_threshold) {
rotate_irqs_among_cpus(useful_load_threshold);
return;
}
goto not_worth_the_effort;
}
first_attempt = 0; /* heaviest search */
max_cpu_irq = tmp_cpu_irq; /* load */
max_loaded = tmp_loaded; /* processor */
imbalance = (max_cpu_irq - min_cpu_irq) / 2;
Dprintk("max_loaded cpu = %d\n", max_loaded);
Dprintk("min_loaded cpu = %d\n", min_loaded);
Dprintk("max_cpu_irq load = %ld\n", max_cpu_irq);
Dprintk("min_cpu_irq load = %ld\n", min_cpu_irq);
Dprintk("load imbalance = %lu\n", imbalance);
/* if imbalance is less than approx 10% of max load, then
* observe diminishing returns action. - quit
*/
if (imbalance < (max_cpu_irq >> 3)) {
Dprintk("Imbalance too trivial\n");
goto not_worth_the_effort;
}
tryanotherirq:
/* if we select an IRQ to move that can't go where we want, then
* see if there is another one to try.
*/
move_this_load = 0;
selected_irq = -1;
for (j = 0; j < NR_IRQS; j++) {
/* Is this an active IRQ? */
if (!irq_desc[j].action)
continue;
if (imbalance <= IRQ_DELTA(max_loaded,j))
continue;
/* Try to find the IRQ that is closest to the imbalance
* without going over.
*/
if (move_this_load < IRQ_DELTA(max_loaded,j)) {
move_this_load = IRQ_DELTA(max_loaded,j);
selected_irq = j;
}
}
if (selected_irq == -1) {
goto tryanothercpu;
}
imbalance = move_this_load;
/* For physical_balance case, we accumlated both load
* values in the one of the siblings cpu_irq[],
* to use the same code for physical and logical processors
* as much as possible.
*
* NOTE: the cpu_irq[] array holds the sum of the load for
* sibling A and sibling B in the slot for the lowest numbered
* sibling (A), _AND_ the load for sibling B in the slot for
* the higher numbered sibling.
*
* We seek the least loaded sibling by making the comparison
* (A+B)/2 vs B
*/
load = CPU_IRQ(min_loaded) >> 1;
for_each_cpu_mask(j, cpu_sibling_map[min_loaded]) {
if (load > CPU_IRQ(j)) {
/* This won't change cpu_sibling_map[min_loaded] */
load = CPU_IRQ(j);
min_loaded = j;
}
}
cpus_and(allowed_mask,
cpu_online_map,
balance_irq_affinity[selected_irq]);
target_cpu_mask = cpumask_of_cpu(min_loaded);
cpus_and(tmp, target_cpu_mask, allowed_mask);
if (!cpus_empty(tmp)) {
Dprintk("irq = %d moved to cpu = %d\n",
selected_irq, min_loaded);
/* mark for change destination */
set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
/* Since we made a change, come back sooner to
* check for more variation.
*/
balanced_irq_interval = max((long)MIN_BALANCED_IRQ_INTERVAL,
balanced_irq_interval - BALANCED_IRQ_LESS_DELTA);
return;
}
goto tryanotherirq;
not_worth_the_effort:
/*
* if we did not find an IRQ to move, then adjust the time interval
* upward
*/
balanced_irq_interval = min((long)MAX_BALANCED_IRQ_INTERVAL,
balanced_irq_interval + BALANCED_IRQ_MORE_DELTA);
Dprintk("IRQ worth rotating not found\n");
return;
}
static int balanced_irq(void *unused)
{
int i;
unsigned long prev_balance_time = jiffies;
long time_remaining = balanced_irq_interval;
daemonize("kirqd");
/* push everything to CPU 0 to give us a starting point. */
for (i = 0 ; i < NR_IRQS ; i++) {
irq_desc[i].pending_mask = cpumask_of_cpu(0);
set_pending_irq(i, cpumask_of_cpu(0));
}
for ( ; ; ) {
time_remaining = schedule_timeout_interruptible(time_remaining);
try_to_freeze();
if (time_after(jiffies,
prev_balance_time+balanced_irq_interval)) {
preempt_disable();
do_irq_balance();
prev_balance_time = jiffies;
time_remaining = balanced_irq_interval;
preempt_enable();
}
}
return 0;
}
static int __init balanced_irq_init(void)
{
int i;
struct cpuinfo_x86 *c;
cpumask_t tmp;
cpus_shift_right(tmp, cpu_online_map, 2);
c = &boot_cpu_data;
/* When not overwritten by the command line ask subarchitecture. */
if (irqbalance_disabled == IRQBALANCE_CHECK_ARCH)
irqbalance_disabled = NO_BALANCE_IRQ;
if (irqbalance_disabled)
return 0;
/* disable irqbalance completely if there is only one processor online */
if (num_online_cpus() < 2) {
irqbalance_disabled = 1;
return 0;
}
/*
* Enable physical balance only if more than 1 physical processor
* is present
*/
if (smp_num_siblings > 1 && !cpus_empty(tmp))
physical_balance = 1;
for_each_online_cpu(i) {
irq_cpu_data[i].irq_delta = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
irq_cpu_data[i].last_irq = kmalloc(sizeof(unsigned long) * NR_IRQS, GFP_KERNEL);
if (irq_cpu_data[i].irq_delta == NULL || irq_cpu_data[i].last_irq == NULL) {
printk(KERN_ERR "balanced_irq_init: out of memory");
goto failed;
}
memset(irq_cpu_data[i].irq_delta,0,sizeof(unsigned long) * NR_IRQS);
memset(irq_cpu_data[i].last_irq,0,sizeof(unsigned long) * NR_IRQS);
}
printk(KERN_INFO "Starting balanced_irq\n");
if (kernel_thread(balanced_irq, NULL, CLONE_KERNEL) >= 0)
return 0;
else
printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
failed:
for_each_possible_cpu(i) {
kfree(irq_cpu_data[i].irq_delta);
irq_cpu_data[i].irq_delta = NULL;
kfree(irq_cpu_data[i].last_irq);
irq_cpu_data[i].last_irq = NULL;
}
return 0;
}
int __init irqbalance_disable(char *str)
{
irqbalance_disabled = 1;
return 1;
}
__setup("noirqbalance", irqbalance_disable);
late_initcall(balanced_irq_init);
#endif /* CONFIG_IRQBALANCE */
#endif /* CONFIG_SMP */
#ifndef CONFIG_SMP
void fastcall send_IPI_self(int vector)
{
unsigned int cfg;
/*
* Wait for idle.
*/
apic_wait_icr_idle();
cfg = APIC_DM_FIXED | APIC_DEST_SELF | vector | APIC_DEST_LOGICAL;
/*
* Send the IPI. The write to APIC_ICR fires this off.
*/
apic_write_around(APIC_ICR, cfg);
}
#endif /* !CONFIG_SMP */
/*
* support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
* specific CPU-side IRQs.
*/
#define MAX_PIRQS 8
static int pirq_entries [MAX_PIRQS];
static int pirqs_enabled;
int skip_ioapic_setup;
static int __init ioapic_setup(char *str)
{
skip_ioapic_setup = 1;
return 1;
}
__setup("noapic", ioapic_setup);
static int __init ioapic_pirq_setup(char *str)
{
int i, max;
int ints[MAX_PIRQS+1];
get_options(str, ARRAY_SIZE(ints), ints);
for (i = 0; i < MAX_PIRQS; i++)
pirq_entries[i] = -1;
pirqs_enabled = 1;
apic_printk(APIC_VERBOSE, KERN_INFO
"PIRQ redirection, working around broken MP-BIOS.\n");
max = MAX_PIRQS;
if (ints[0] < MAX_PIRQS)
max = ints[0];
for (i = 0; i < max; i++) {
apic_printk(APIC_VERBOSE, KERN_DEBUG
"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
/*
* PIRQs are mapped upside down, usually.
*/
pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
}
return 1;
}
__setup("pirq=", ioapic_pirq_setup);
/*
* Find the IRQ entry number of a certain pin.
*/
static int find_irq_entry(int apic, int pin, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++)
if (mp_irqs[i].mpc_irqtype == type &&
(mp_irqs[i].mpc_dstapic == mp_ioapics[apic].mpc_apicid ||
mp_irqs[i].mpc_dstapic == MP_APIC_ALL) &&
mp_irqs[i].mpc_dstirq == pin)
return i;
return -1;
}
/*
* Find the pin to which IRQ[irq] (ISA) is connected
*/
static int __init find_isa_irq_pin(int irq, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].mpc_srcbus;
if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
mp_bus_id_to_type[lbus] == MP_BUS_NEC98
) &&
(mp_irqs[i].mpc_irqtype == type) &&
(mp_irqs[i].mpc_srcbusirq == irq))
return mp_irqs[i].mpc_dstirq;
}
return -1;
}
static int __init find_isa_irq_apic(int irq, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].mpc_srcbus;
if ((mp_bus_id_to_type[lbus] == MP_BUS_ISA ||
mp_bus_id_to_type[lbus] == MP_BUS_EISA ||
mp_bus_id_to_type[lbus] == MP_BUS_MCA ||
mp_bus_id_to_type[lbus] == MP_BUS_NEC98
) &&
(mp_irqs[i].mpc_irqtype == type) &&
(mp_irqs[i].mpc_srcbusirq == irq))
break;
}
if (i < mp_irq_entries) {
int apic;
for(apic = 0; apic < nr_ioapics; apic++) {
if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic)
return apic;
}
}
return -1;
}
/*
* Find a specific PCI IRQ entry.
* Not an __init, possibly needed by modules
*/
static int pin_2_irq(int idx, int apic, int pin);
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
{
int apic, i, best_guess = -1;
apic_printk(APIC_DEBUG, "querying PCI -> IRQ mapping bus:%d, "
"slot:%d, pin:%d.\n", bus, slot, pin);
if (mp_bus_id_to_pci_bus[bus] == -1) {
printk(KERN_WARNING "PCI BIOS passed nonexistent PCI bus %d!\n", bus);
return -1;
}
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].mpc_srcbus;
for (apic = 0; apic < nr_ioapics; apic++)
if (mp_ioapics[apic].mpc_apicid == mp_irqs[i].mpc_dstapic ||
mp_irqs[i].mpc_dstapic == MP_APIC_ALL)
break;
if ((mp_bus_id_to_type[lbus] == MP_BUS_PCI) &&
!mp_irqs[i].mpc_irqtype &&
(bus == lbus) &&
(slot == ((mp_irqs[i].mpc_srcbusirq >> 2) & 0x1f))) {
int irq = pin_2_irq(i,apic,mp_irqs[i].mpc_dstirq);
if (!(apic || IO_APIC_IRQ(irq)))
continue;
if (pin == (mp_irqs[i].mpc_srcbusirq & 3))
return irq;
/*
* Use the first all-but-pin matching entry as a
* best-guess fuzzy result for broken mptables.
*/
if (best_guess < 0)
best_guess = irq;
}
}
return best_guess;
}
EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
/*
* This function currently is only a helper for the i386 smp boot process where
* we need to reprogram the ioredtbls to cater for the cpus which have come online
* so mask in all cases should simply be TARGET_CPUS
*/
#ifdef CONFIG_SMP
void __init setup_ioapic_dest(void)
{
int pin, ioapic, irq, irq_entry;
if (skip_ioapic_setup == 1)
return;
for (ioapic = 0; ioapic < nr_ioapics; ioapic++) {
for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
irq_entry = find_irq_entry(ioapic, pin, mp_INT);
if (irq_entry == -1)
continue;
irq = pin_2_irq(irq_entry, ioapic, pin);
set_ioapic_affinity_irq(irq, TARGET_CPUS);
}
}
}
#endif
/*
* EISA Edge/Level control register, ELCR
*/
static int EISA_ELCR(unsigned int irq)
{
if (irq < 16) {
unsigned int port = 0x4d0 + (irq >> 3);
return (inb(port) >> (irq & 7)) & 1;
}
apic_printk(APIC_VERBOSE, KERN_INFO
"Broken MPtable reports ISA irq %d\n", irq);
return 0;
}
/* EISA interrupts are always polarity zero and can be edge or level
* trigger depending on the ELCR value. If an interrupt is listed as
* EISA conforming in the MP table, that means its trigger type must
* be read in from the ELCR */
#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].mpc_srcbusirq))
#define default_EISA_polarity(idx) (0)
/* ISA interrupts are always polarity zero edge triggered,
* when listed as conforming in the MP table. */
#define default_ISA_trigger(idx) (0)
#define default_ISA_polarity(idx) (0)
/* PCI interrupts are always polarity one level triggered,
* when listed as conforming in the MP table. */
#define default_PCI_trigger(idx) (1)
#define default_PCI_polarity(idx) (1)
/* MCA interrupts are always polarity zero level triggered,
* when listed as conforming in the MP table. */
#define default_MCA_trigger(idx) (1)
#define default_MCA_polarity(idx) (0)
/* NEC98 interrupts are always polarity zero edge triggered,
* when listed as conforming in the MP table. */
#define default_NEC98_trigger(idx) (0)
#define default_NEC98_polarity(idx) (0)
static int __init MPBIOS_polarity(int idx)
{
int bus = mp_irqs[idx].mpc_srcbus;
int polarity;
/*
* Determine IRQ line polarity (high active or low active):
*/
switch (mp_irqs[idx].mpc_irqflag & 3)
{
case 0: /* conforms, ie. bus-type dependent polarity */
{
switch (mp_bus_id_to_type[bus])
{
case MP_BUS_ISA: /* ISA pin */
{
polarity = default_ISA_polarity(idx);
break;
}
case MP_BUS_EISA: /* EISA pin */
{
polarity = default_EISA_polarity(idx);
break;
}
case MP_BUS_PCI: /* PCI pin */
{
polarity = default_PCI_polarity(idx);
break;
}
case MP_BUS_MCA: /* MCA pin */
{
polarity = default_MCA_polarity(idx);
break;
}
case MP_BUS_NEC98: /* NEC 98 pin */
{
polarity = default_NEC98_polarity(idx);
break;
}
default:
{
printk(KERN_WARNING "broken BIOS!!\n");
polarity = 1;
break;
}
}
break;
}
case 1: /* high active */
{
polarity = 0;
break;
}
case 2: /* reserved */
{
printk(KERN_WARNING "broken BIOS!!\n");
polarity = 1;
break;
}
case 3: /* low active */
{
polarity = 1;
break;
}
default: /* invalid */
{
printk(KERN_WARNING "broken BIOS!!\n");
polarity = 1;
break;
}
}
return polarity;
}
static int MPBIOS_trigger(int idx)
{
int bus = mp_irqs[idx].mpc_srcbus;
int trigger;
/*
* Determine IRQ trigger mode (edge or level sensitive):
*/
switch ((mp_irqs[idx].mpc_irqflag>>2) & 3)
{
case 0: /* conforms, ie. bus-type dependent */
{
switch (mp_bus_id_to_type[bus])
{
case MP_BUS_ISA: /* ISA pin */
{
trigger = default_ISA_trigger(idx);
break;
}
case MP_BUS_EISA: /* EISA pin */
{
trigger = default_EISA_trigger(idx);
break;
}
case MP_BUS_PCI: /* PCI pin */
{
trigger = default_PCI_trigger(idx);
break;
}
case MP_BUS_MCA: /* MCA pin */
{
trigger = default_MCA_trigger(idx);
break;
}
case MP_BUS_NEC98: /* NEC 98 pin */
{
trigger = default_NEC98_trigger(idx);
break;
}
default:
{
printk(KERN_WARNING "broken BIOS!!\n");
trigger = 1;
break;
}
}
break;
}
case 1: /* edge */
{
trigger = 0;
break;
}
case 2: /* reserved */
{
printk(KERN_WARNING "broken BIOS!!\n");
trigger = 1;
break;
}
case 3: /* level */
{
trigger = 1;
break;
}
default: /* invalid */
{
printk(KERN_WARNING "broken BIOS!!\n");
trigger = 0;
break;
}
}
return trigger;
}
static inline int irq_polarity(int idx)
{
return MPBIOS_polarity(idx);
}
static inline int irq_trigger(int idx)
{
return MPBIOS_trigger(idx);
}
static int pin_2_irq(int idx, int apic, int pin)
{
int irq, i;
int bus = mp_irqs[idx].mpc_srcbus;
/*
* Debugging check, we are in big trouble if this message pops up!
*/
if (mp_irqs[idx].mpc_dstirq != pin)
printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
switch (mp_bus_id_to_type[bus])
{
case MP_BUS_ISA: /* ISA pin */
case MP_BUS_EISA:
case MP_BUS_MCA:
case MP_BUS_NEC98:
{
irq = mp_irqs[idx].mpc_srcbusirq;
break;
}
case MP_BUS_PCI: /* PCI pin */
{
/*
* PCI IRQs are mapped in order
*/
i = irq = 0;
while (i < apic)
irq += nr_ioapic_registers[i++];
irq += pin;
/*
* For MPS mode, so far only needed by ES7000 platform
*/
if (ioapic_renumber_irq)
irq = ioapic_renumber_irq(apic, irq);
break;
}
default:
{
printk(KERN_ERR "unknown bus type %d.\n",bus);
irq = 0;
break;
}
}
/*
* PCI IRQ command line redirection. Yes, limits are hardcoded.
*/
if ((pin >= 16) && (pin <= 23)) {
if (pirq_entries[pin-16] != -1) {
if (!pirq_entries[pin-16]) {
apic_printk(APIC_VERBOSE, KERN_DEBUG
"disabling PIRQ%d\n", pin-16);
} else {
irq = pirq_entries[pin-16];
apic_printk(APIC_VERBOSE, KERN_DEBUG
"using PIRQ%d -> IRQ %d\n",
pin-16, irq);
}
}
}
return irq;
}
static inline int IO_APIC_irq_trigger(int irq)
{
int apic, idx, pin;
for (apic = 0; apic < nr_ioapics; apic++) {
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
idx = find_irq_entry(apic,pin,mp_INT);
if ((idx != -1) && (irq == pin_2_irq(idx,apic,pin)))
return irq_trigger(idx);
}
}
/*
* nonexistent IRQs are edge default
*/
return 0;
}
/* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
static int __assign_irq_vector(int irq)
{
static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
int vector;
BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
if (irq_vector[irq] > 0)
return irq_vector[irq];
current_vector += 8;
if (current_vector == SYSCALL_VECTOR)
current_vector += 8;
if (current_vector >= FIRST_SYSTEM_VECTOR) {
offset++;
if (!(offset % 8))
return -ENOSPC;
current_vector = FIRST_DEVICE_VECTOR + offset;
}
vector = current_vector;
irq_vector[irq] = vector;
return vector;
}
static int assign_irq_vector(int irq)
{
unsigned long flags;
int vector;
spin_lock_irqsave(&vector_lock, flags);
vector = __assign_irq_vector(irq);
spin_unlock_irqrestore(&vector_lock, flags);
return vector;
}
static struct irq_chip ioapic_chip;
#define IOAPIC_AUTO -1
#define IOAPIC_EDGE 0
#define IOAPIC_LEVEL 1
static void ioapic_register_intr(int irq, int vector, unsigned long trigger)
{
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
trigger == IOAPIC_LEVEL)
set_irq_chip_and_handler_name(irq, &ioapic_chip,
handle_fasteoi_irq, "fasteoi");
else {
irq_desc[irq].status |= IRQ_DELAYED_DISABLE;
set_irq_chip_and_handler_name(irq, &ioapic_chip,
handle_edge_irq, "edge");
}
set_intr_gate(vector, interrupt[irq]);
}
static void __init setup_IO_APIC_irqs(void)
{
struct IO_APIC_route_entry entry;
int apic, pin, idx, irq, first_notcon = 1, vector;
unsigned long flags;
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
for (apic = 0; apic < nr_ioapics; apic++) {
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
/*
* add it to the IO-APIC irq-routing table:
*/
memset(&entry,0,sizeof(entry));
entry.delivery_mode = INT_DELIVERY_MODE;
entry.dest_mode = INT_DEST_MODE;
entry.mask = 0; /* enable IRQ */
entry.dest.logical.logical_dest =
cpu_mask_to_apicid(TARGET_CPUS);
idx = find_irq_entry(apic,pin,mp_INT);
if (idx == -1) {
if (first_notcon) {
apic_printk(APIC_VERBOSE, KERN_DEBUG
" IO-APIC (apicid-pin) %d-%d",
mp_ioapics[apic].mpc_apicid,
pin);
first_notcon = 0;
} else
apic_printk(APIC_VERBOSE, ", %d-%d",
mp_ioapics[apic].mpc_apicid, pin);
continue;
}
entry.trigger = irq_trigger(idx);
entry.polarity = irq_polarity(idx);
if (irq_trigger(idx)) {
entry.trigger = 1;
entry.mask = 1;
}
irq = pin_2_irq(idx, apic, pin);
/*
* skip adding the timer int on secondary nodes, which causes
* a small but painful rift in the time-space continuum
*/
if (multi_timer_check(apic, irq))
continue;
else
add_pin_to_irq(irq, apic, pin);
if (!apic && !IO_APIC_IRQ(irq))
continue;
if (IO_APIC_IRQ(irq)) {
vector = assign_irq_vector(irq);
entry.vector = vector;
ioapic_register_intr(irq, vector, IOAPIC_AUTO);
if (!apic && (irq < 16))
disable_8259A_irq(irq);
}
spin_lock_irqsave(&ioapic_lock, flags);
__ioapic_write_entry(apic, pin, entry);
set_native_irq_info(irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
}
if (!first_notcon)
apic_printk(APIC_VERBOSE, " not connected.\n");
}
/*
* Set up the 8259A-master output pin:
*/
static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
{
struct IO_APIC_route_entry entry;
memset(&entry,0,sizeof(entry));
disable_8259A_irq(0);
/* mask LVT0 */
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
/*
* We use logical delivery to get the timer IRQ
* to the first CPU.
*/
entry.dest_mode = INT_DEST_MODE;
entry.mask = 0; /* unmask IRQ now */
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
entry.delivery_mode = INT_DELIVERY_MODE;
entry.polarity = 0;
entry.trigger = 0;
entry.vector = vector;
/*
* The timer IRQ doesn't have to know that behind the
* scene we have a 8259A-master in AEOI mode ...
*/
irq_desc[0].chip = &ioapic_chip;
set_irq_handler(0, handle_edge_irq);
/*
* Add it to the IO-APIC irq-routing table:
*/
ioapic_write_entry(apic, pin, entry);
enable_8259A_irq(0);
}
static inline void UNEXPECTED_IO_APIC(void)
{
}
void __init print_IO_APIC(void)
{
int apic, i;
union IO_APIC_reg_00 reg_00;
union IO_APIC_reg_01 reg_01;
union IO_APIC_reg_02 reg_02;
union IO_APIC_reg_03 reg_03;
unsigned long flags;
if (apic_verbosity == APIC_QUIET)
return;
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
for (i = 0; i < nr_ioapics; i++)
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
mp_ioapics[i].mpc_apicid, nr_ioapic_registers[i]);
/*
* We are a bit conservative about what we expect. We have to
* know about every hardware change ASAP.
*/
printk(KERN_INFO "testing the IO APIC.......................\n");
for (apic = 0; apic < nr_ioapics; apic++) {
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
reg_01.raw = io_apic_read(apic, 1);
if (reg_01.bits.version >= 0x10)
reg_02.raw = io_apic_read(apic, 2);
if (reg_01.bits.version >= 0x20)
reg_03.raw = io_apic_read(apic, 3);
spin_unlock_irqrestore(&ioapic_lock, flags);
printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].mpc_apicid);
printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
if (reg_00.bits.ID >= get_physical_broadcast())
UNEXPECTED_IO_APIC();
if (reg_00.bits.__reserved_1 || reg_00.bits.__reserved_2)
UNEXPECTED_IO_APIC();
printk(KERN_DEBUG ".... register #01: %08X\n", reg_01.raw);
printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
if ( (reg_01.bits.entries != 0x0f) && /* older (Neptune) boards */
(reg_01.bits.entries != 0x17) && /* typical ISA+PCI boards */
(reg_01.bits.entries != 0x1b) && /* Compaq Proliant boards */
(reg_01.bits.entries != 0x1f) && /* dual Xeon boards */
(reg_01.bits.entries != 0x22) && /* bigger Xeon boards */
(reg_01.bits.entries != 0x2E) &&
(reg_01.bits.entries != 0x3F)
)
UNEXPECTED_IO_APIC();
printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
if ( (reg_01.bits.version != 0x01) && /* 82489DX IO-APICs */
(reg_01.bits.version != 0x10) && /* oldest IO-APICs */
(reg_01.bits.version != 0x11) && /* Pentium/Pro IO-APICs */
(reg_01.bits.version != 0x13) && /* Xeon IO-APICs */
(reg_01.bits.version != 0x20) /* Intel P64H (82806 AA) */
)
UNEXPECTED_IO_APIC();
if (reg_01.bits.__reserved_1 || reg_01.bits.__reserved_2)
UNEXPECTED_IO_APIC();
/*
* Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
* but the value of reg_02 is read as the previous read register
* value, so ignore it if reg_02 == reg_01.
*/
if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
if (reg_02.bits.__reserved_1 || reg_02.bits.__reserved_2)
UNEXPECTED_IO_APIC();
}
/*
* Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
* or reg_03, but the value of reg_0[23] is read as the previous read
* register value, so ignore it if reg_03 == reg_0[12].
*/
if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
reg_03.raw != reg_01.raw) {
printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
if (reg_03.bits.__reserved_1)
UNEXPECTED_IO_APIC();
}
printk(KERN_DEBUG ".... IRQ redirection table:\n");
printk(KERN_DEBUG " NR Log Phy Mask Trig IRR Pol"
" Stat Dest Deli Vect: \n");
for (i = 0; i <= reg_01.bits.entries; i++) {
struct IO_APIC_route_entry entry;
entry = ioapic_read_entry(apic, i);
printk(KERN_DEBUG " %02x %03X %02X ",
i,
entry.dest.logical.logical_dest,
entry.dest.physical.physical_dest
);
printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
entry.mask,
entry.trigger,
entry.irr,
entry.polarity,
entry.delivery_status,
entry.dest_mode,
entry.delivery_mode,
entry.vector
);
}
}
printk(KERN_DEBUG "IRQ to pin mappings:\n");
for (i = 0; i < NR_IRQS; i++) {
struct irq_pin_list *entry = irq_2_pin + i;
if (entry->pin < 0)
continue;
printk(KERN_DEBUG "IRQ%d ", i);
for (;;) {
printk("-> %d:%d", entry->apic, entry->pin);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
}
printk("\n");
}
printk(KERN_INFO ".................................... done.\n");
return;
}
#if 0
static void print_APIC_bitfield (int base)
{
unsigned int v;
int i, j;
if (apic_verbosity == APIC_QUIET)
return;
printk(KERN_DEBUG "0123456789abcdef0123456789abcdef\n" KERN_DEBUG);
for (i = 0; i < 8; i++) {
v = apic_read(base + i*0x10);
for (j = 0; j < 32; j++) {
if (v & (1<<j))
printk("1");
else
printk("0");
}
printk("\n");
}
}
void /*__init*/ print_local_APIC(void * dummy)
{
unsigned int v, ver, maxlvt;
if (apic_verbosity == APIC_QUIET)
return;
printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
smp_processor_id(), hard_smp_processor_id());
v = apic_read(APIC_ID);
printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, GET_APIC_ID(v));
v = apic_read(APIC_LVR);
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
ver = GET_APIC_VERSION(v);
maxlvt = get_maxlvt();
v = apic_read(APIC_TASKPRI);
printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
if (APIC_INTEGRATED(ver)) { /* !82489DX */
v = apic_read(APIC_ARBPRI);
printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
v & APIC_ARBPRI_MASK);
v = apic_read(APIC_PROCPRI);
printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
}
v = apic_read(APIC_EOI);
printk(KERN_DEBUG "... APIC EOI: %08x\n", v);
v = apic_read(APIC_RRR);
printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
v = apic_read(APIC_LDR);
printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
v = apic_read(APIC_DFR);
printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
v = apic_read(APIC_SPIV);
printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
printk(KERN_DEBUG "... APIC ISR field:\n");
print_APIC_bitfield(APIC_ISR);
printk(KERN_DEBUG "... APIC TMR field:\n");
print_APIC_bitfield(APIC_TMR);
printk(KERN_DEBUG "... APIC IRR field:\n");
print_APIC_bitfield(APIC_IRR);
if (APIC_INTEGRATED(ver)) { /* !82489DX */
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
apic_write(APIC_ESR, 0);
v = apic_read(APIC_ESR);
printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
}
v = apic_read(APIC_ICR);
printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
v = apic_read(APIC_ICR2);
printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
v = apic_read(APIC_LVTT);
printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
if (maxlvt > 3) { /* PC is LVT#4. */
v = apic_read(APIC_LVTPC);
printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
}
v = apic_read(APIC_LVT0);
printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
v = apic_read(APIC_LVT1);
printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
if (maxlvt > 2) { /* ERR is LVT#3. */
v = apic_read(APIC_LVTERR);
printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
}
v = apic_read(APIC_TMICT);
printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
v = apic_read(APIC_TMCCT);
printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
v = apic_read(APIC_TDCR);
printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
printk("\n");
}
void print_all_local_APICs (void)
{
on_each_cpu(print_local_APIC, NULL, 1, 1);
}
void /*__init*/ print_PIC(void)
{
unsigned int v;
unsigned long flags;
if (apic_verbosity == APIC_QUIET)
return;
printk(KERN_DEBUG "\nprinting PIC contents\n");
spin_lock_irqsave(&i8259A_lock, flags);
v = inb(0xa1) << 8 | inb(0x21);
printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
v = inb(0xa0) << 8 | inb(0x20);
printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
outb(0x0b,0xa0);
outb(0x0b,0x20);
v = inb(0xa0) << 8 | inb(0x20);
outb(0x0a,0xa0);
outb(0x0a,0x20);
spin_unlock_irqrestore(&i8259A_lock, flags);
printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
v = inb(0x4d1) << 8 | inb(0x4d0);
printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
}
#endif /* 0 */
static void __init enable_IO_APIC(void)
{
union IO_APIC_reg_01 reg_01;
int i8259_apic, i8259_pin;
int i, apic;
unsigned long flags;
for (i = 0; i < PIN_MAP_SIZE; i++) {
irq_2_pin[i].pin = -1;
irq_2_pin[i].next = 0;
}
if (!pirqs_enabled)
for (i = 0; i < MAX_PIRQS; i++)
pirq_entries[i] = -1;
/*
* The number of IO-APIC IRQ registers (== #pins):
*/
for (apic = 0; apic < nr_ioapics; apic++) {
spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(apic, 1);
spin_unlock_irqrestore(&ioapic_lock, flags);
nr_ioapic_registers[apic] = reg_01.bits.entries+1;
}
for(apic = 0; apic < nr_ioapics; apic++) {
int pin;
/* See if any of the pins is in ExtINT mode */
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
struct IO_APIC_route_entry entry;
entry = ioapic_read_entry(apic, pin);
/* If the interrupt line is enabled and in ExtInt mode
* I have found the pin where the i8259 is connected.
*/
if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
ioapic_i8259.apic = apic;
ioapic_i8259.pin = pin;
goto found_i8259;
}
}
}
found_i8259:
/* Look to see what if the MP table has reported the ExtINT */
/* If we could not find the appropriate pin by looking at the ioapic
* the i8259 probably is not connected the ioapic but give the
* mptable a chance anyway.
*/
i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
/* Trust the MP table if nothing is setup in the hardware */
if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
ioapic_i8259.pin = i8259_pin;
ioapic_i8259.apic = i8259_apic;
}
/* Complain if the MP table and the hardware disagree */
if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
{
printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
}
/*
* Do not trust the IO-APIC being empty at bootup
*/
clear_IO_APIC();
}
/*
* Not an __init, needed by the reboot code
*/
void disable_IO_APIC(void)
{
/*
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
/*
* If the i8259 is routed through an IOAPIC
* Put that IOAPIC in virtual wire mode
* so legacy interrupts can be delivered.
*/
if (ioapic_i8259.pin != -1) {
struct IO_APIC_route_entry entry;
memset(&entry, 0, sizeof(entry));
entry.mask = 0; /* Enabled */
entry.trigger = 0; /* Edge */
entry.irr = 0;
entry.polarity = 0; /* High */
entry.delivery_status = 0;
entry.dest_mode = 0; /* Physical */
entry.delivery_mode = dest_ExtINT; /* ExtInt */
entry.vector = 0;
entry.dest.physical.physical_dest =
GET_APIC_ID(apic_read(APIC_ID));
/*
* Add it to the IO-APIC irq-routing table:
*/
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
}
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
}
/*
* function to set the IO-APIC physical IDs based on the
* values stored in the MPC table.
*
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
*/
#ifndef CONFIG_X86_NUMAQ
static void __init setup_ioapic_ids_from_mpc(void)
{
union IO_APIC_reg_00 reg_00;
physid_mask_t phys_id_present_map;
int apic;
int i;
unsigned char old_id;
unsigned long flags;
/*
* Don't check I/O APIC IDs for xAPIC systems. They have
* no meaning without the serial APIC bus.
*/
if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
|| APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
return;
/*
* This is broken; anything with a real cpu count has to
* circumvent this idiocy regardless.
*/
phys_id_present_map = ioapic_phys_id_map(phys_cpu_present_map);
/*
* Set the IOAPIC ID to the value stored in the MPC table.
*/
for (apic = 0; apic < nr_ioapics; apic++) {
/* Read the register 0 value */
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
old_id = mp_ioapics[apic].mpc_apicid;
if (mp_ioapics[apic].mpc_apicid >= get_physical_broadcast()) {
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
apic, mp_ioapics[apic].mpc_apicid);
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
reg_00.bits.ID);
mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
}
/*
* Sanity check, is the ID really free? Every APIC in a
* system must have a unique ID or we get lots of nice
* 'stuck on smp_invalidate_needed IPI wait' messages.
*/
if (check_apicid_used(phys_id_present_map,
mp_ioapics[apic].mpc_apicid)) {
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
apic, mp_ioapics[apic].mpc_apicid);
for (i = 0; i < get_physical_broadcast(); i++)
if (!physid_isset(i, phys_id_present_map))
break;
if (i >= get_physical_broadcast())
panic("Max APIC ID exceeded!\n");
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
i);
physid_set(i, phys_id_present_map);
mp_ioapics[apic].mpc_apicid = i;
} else {
physid_mask_t tmp;
tmp = apicid_to_cpu_present(mp_ioapics[apic].mpc_apicid);
apic_printk(APIC_VERBOSE, "Setting %d in the "
"phys_id_present_map\n",
mp_ioapics[apic].mpc_apicid);
physids_or(phys_id_present_map, phys_id_present_map, tmp);
}
/*
* We need to adjust the IRQ routing table
* if the ID changed.
*/
if (old_id != mp_ioapics[apic].mpc_apicid)
for (i = 0; i < mp_irq_entries; i++)
if (mp_irqs[i].mpc_dstapic == old_id)
mp_irqs[i].mpc_dstapic
= mp_ioapics[apic].mpc_apicid;
/*
* Read the right value from the MPC table and
* write it into the ID register.
*/
apic_printk(APIC_VERBOSE, KERN_INFO
"...changing IO-APIC physical APIC ID to %d ...",
mp_ioapics[apic].mpc_apicid);
reg_00.bits.ID = mp_ioapics[apic].mpc_apicid;
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0, reg_00.raw);
spin_unlock_irqrestore(&ioapic_lock, flags);
/*
* Sanity check
*/
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(apic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
if (reg_00.bits.ID != mp_ioapics[apic].mpc_apicid)
printk("could not set ID!\n");
else
apic_printk(APIC_VERBOSE, " ok.\n");
}
}
#else
static void __init setup_ioapic_ids_from_mpc(void) { }
#endif
/*
* There is a nasty bug in some older SMP boards, their mptable lies
* about the timer IRQ. We do the following to work around the situation:
*
* - timer IRQ defaults to IO-APIC IRQ
* - if this function detects that timer IRQs are defunct, then we fall
* back to ISA timer IRQs
*/
static int __init timer_irq_works(void)
{
unsigned long t1 = jiffies;
local_irq_enable();
/* Let ten ticks pass... */
mdelay((10 * 1000) / HZ);
/*
* Expect a few ticks at least, to be sure some possible
* glue logic does not lock up after one or two first
* ticks in a non-ExtINT mode. Also the local APIC
* might have cached one ExtINT interrupt. Finally, at
* least one tick may be lost due to delays.
*/
if (jiffies - t1 > 4)
return 1;
return 0;
}
/*
* In the SMP+IOAPIC case it might happen that there are an unspecified
* number of pending IRQ events unhandled. These cases are very rare,
* so we 'resend' these IRQs via IPIs, to the same CPU. It's much
* better to do it this way as thus we do not have to be aware of
* 'pending' interrupts in the IRQ path, except at this point.
*/
/*
* Edge triggered needs to resend any interrupt
* that was delayed but this is now handled in the device
* independent code.
*/
/*
* Startup quirk:
*
* Starting up a edge-triggered IO-APIC interrupt is
* nasty - we need to make sure that we get the edge.
* If it is already asserted for some reason, we need
* return 1 to indicate that is was pending.
*
* This is not complete - we should be able to fake
* an edge even if it isn't on the 8259A...
*
* (We do this for level-triggered IRQs too - it cannot hurt.)
*/
static unsigned int startup_ioapic_irq(unsigned int irq)
{
int was_pending = 0;
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
if (irq < 16) {
disable_8259A_irq(irq);
if (i8259A_irq_pending(irq))
was_pending = 1;
}
__unmask_IO_APIC_irq(irq);
spin_unlock_irqrestore(&ioapic_lock, flags);
return was_pending;
}
static void ack_ioapic_irq(unsigned int irq)
{
move_native_irq(irq);
ack_APIC_irq();
}
static void ack_ioapic_quirk_irq(unsigned int irq)
{
unsigned long v;
int i;
move_native_irq(irq);
/*
* It appears there is an erratum which affects at least version 0x11
* of I/O APIC (that's the 82093AA and cores integrated into various
* chipsets). Under certain conditions a level-triggered interrupt is
* erroneously delivered as edge-triggered one but the respective IRR
* bit gets set nevertheless. As a result the I/O unit expects an EOI
* message but it will never arrive and further interrupts are blocked
* from the source. The exact reason is so far unknown, but the
* phenomenon was observed when two consecutive interrupt requests
* from a given source get delivered to the same CPU and the source is
* temporarily disabled in between.
*
* A workaround is to simulate an EOI message manually. We achieve it
* by setting the trigger mode to edge and then to level when the edge
* trigger mode gets detected in the TMR of a local APIC for a
* level-triggered interrupt. We mask the source for the time of the
* operation to prevent an edge-triggered interrupt escaping meanwhile.
* The idea is from Manfred Spraul. --macro
*/
i = irq_vector[irq];
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
ack_APIC_irq();
if (!(v & (1 << (i & 0x1f)))) {
atomic_inc(&irq_mis_count);
spin_lock(&ioapic_lock);
__mask_and_edge_IO_APIC_irq(irq);
__unmask_and_level_IO_APIC_irq(irq);
spin_unlock(&ioapic_lock);
}
}
static int ioapic_retrigger_irq(unsigned int irq)
{
send_IPI_self(irq_vector[irq]);
return 1;
}
static struct irq_chip ioapic_chip __read_mostly = {
.name = "IO-APIC",
.startup = startup_ioapic_irq,
.mask = mask_IO_APIC_irq,
.unmask = unmask_IO_APIC_irq,
.ack = ack_ioapic_irq,
.eoi = ack_ioapic_quirk_irq,
#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity_irq,
#endif
.retrigger = ioapic_retrigger_irq,
};
static inline void init_IO_APIC_traps(void)
{
int irq;
/*
* NOTE! The local APIC isn't very good at handling
* multiple interrupts at the same interrupt level.
* As the interrupt level is determined by taking the
* vector number and shifting that right by 4, we
* want to spread these out a bit so that they don't
* all fall in the same interrupt level.
*
* Also, we've got to be careful not to trash gate
* 0x80, because int 0x80 is hm, kind of importantish. ;)
*/
for (irq = 0; irq < NR_IRQS ; irq++) {
int tmp = irq;
if (IO_APIC_IRQ(tmp) && !irq_vector[tmp]) {
/*
* Hmm.. We don't have an entry for this,
* so default to an old-fashioned 8259
* interrupt if we can..
*/
if (irq < 16)
make_8259A_irq(irq);
else
/* Strange. Oh, well.. */
irq_desc[irq].chip = &no_irq_chip;
}
}
}
/*
* The local APIC irq-chip implementation:
*/
static void ack_apic(unsigned int irq)
{
ack_APIC_irq();
}
static void mask_lapic_irq (unsigned int irq)
{
unsigned long v;
v = apic_read(APIC_LVT0);
apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
}
static void unmask_lapic_irq (unsigned int irq)
{
unsigned long v;
v = apic_read(APIC_LVT0);
apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
}
static struct irq_chip lapic_chip __read_mostly = {
.name = "local-APIC-edge",
.mask = mask_lapic_irq,
.unmask = unmask_lapic_irq,
.eoi = ack_apic,
};
static void setup_nmi (void)
{
/*
* Dirty trick to enable the NMI watchdog ...
* We put the 8259A master into AEOI mode and
* unmask on all local APICs LVT0 as NMI.
*
* The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
* is from Maciej W. Rozycki - so we do not have to EOI from
* the NMI handler or the timer interrupt.
*/
apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
on_each_cpu(enable_NMI_through_LVT0, NULL, 1, 1);
apic_printk(APIC_VERBOSE, " done.\n");
}
/*
* This looks a bit hackish but it's about the only one way of sending
* a few INTA cycles to 8259As and any associated glue logic. ICR does
* not support the ExtINT mode, unfortunately. We need to send these
* cycles as some i82489DX-based boards have glue logic that keeps the
* 8259A interrupt line asserted until INTA. --macro
*/
static inline void unlock_ExtINT_logic(void)
{
int apic, pin, i;
struct IO_APIC_route_entry entry0, entry1;
unsigned char save_control, save_freq_select;
pin = find_isa_irq_pin(8, mp_INT);
apic = find_isa_irq_apic(8, mp_INT);
if (pin == -1)
return;
entry0 = ioapic_read_entry(apic, pin);
clear_IO_APIC_pin(apic, pin);
memset(&entry1, 0, sizeof(entry1));
entry1.dest_mode = 0; /* physical delivery */
entry1.mask = 0; /* unmask IRQ now */
entry1.dest.physical.physical_dest = hard_smp_processor_id();
entry1.delivery_mode = dest_ExtINT;
entry1.polarity = entry0.polarity;
entry1.trigger = 0;
entry1.vector = 0;
ioapic_write_entry(apic, pin, entry1);
save_control = CMOS_READ(RTC_CONTROL);
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
RTC_FREQ_SELECT);
CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
i = 100;
while (i-- > 0) {
mdelay(10);
if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
i -= 10;
}
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
clear_IO_APIC_pin(apic, pin);
ioapic_write_entry(apic, pin, entry0);
}
int timer_uses_ioapic_pin_0;
/*
* This code may look a bit paranoid, but it's supposed to cooperate with
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
* fanatically on his truly buggy board.
*/
static inline void check_timer(void)
{
int apic1, pin1, apic2, pin2;
int vector;
/*
* get/set the timer IRQ vector:
*/
disable_8259A_irq(0);
vector = assign_irq_vector(0);
set_intr_gate(vector, interrupt[0]);
/*
* Subtle, code in do_timer_interrupt() expects an AEOI
* mode for the 8259A whenever interrupts are routed
* through I/O APICs. Also IRQ0 has to be enabled in
* the 8259A which implies the virtual wire has to be
* disabled in the local APIC.
*/
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
init_8259A(1);
timer_ack = 1;
if (timer_over_8254 > 0)
enable_8259A_irq(0);
pin1 = find_isa_irq_pin(0, mp_INT);
apic1 = find_isa_irq_apic(0, mp_INT);
pin2 = ioapic_i8259.pin;
apic2 = ioapic_i8259.apic;
if (pin1 == 0)
timer_uses_ioapic_pin_0 = 1;
printk(KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
vector, apic1, pin1, apic2, pin2);
if (pin1 != -1) {
/*
* Ok, does IRQ0 through the IOAPIC work?
*/
unmask_IO_APIC_irq(0);
if (timer_irq_works()) {
if (nmi_watchdog == NMI_IO_APIC) {
disable_8259A_irq(0);
setup_nmi();
enable_8259A_irq(0);
}
if (disable_timer_pin_1 > 0)
clear_IO_APIC_pin(0, pin1);
return;
}
clear_IO_APIC_pin(apic1, pin1);
printk(KERN_ERR "..MP-BIOS bug: 8254 timer not connected to "
"IO-APIC\n");
}
printk(KERN_INFO "...trying to set up timer (IRQ0) through the 8259A ... ");
if (pin2 != -1) {
printk("\n..... (found pin %d) ...", pin2);
/*
* legacy devices should be connected to IO APIC #0
*/
setup_ExtINT_IRQ0_pin(apic2, pin2, vector);
if (timer_irq_works()) {
printk("works.\n");
if (pin1 != -1)
replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
else
add_pin_to_irq(0, apic2, pin2);
if (nmi_watchdog == NMI_IO_APIC) {
setup_nmi();
}
return;
}
/*
* Cleanup, just in case ...
*/
clear_IO_APIC_pin(apic2, pin2);
}
printk(" failed.\n");
if (nmi_watchdog == NMI_IO_APIC) {
printk(KERN_WARNING "timer doesn't work through the IO-APIC - disabling NMI Watchdog!\n");
nmi_watchdog = 0;
}
printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
disable_8259A_irq(0);
set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq,
"fasteio");
apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector); /* Fixed mode */
enable_8259A_irq(0);
if (timer_irq_works()) {
printk(" works.\n");
return;
}
apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | vector);
printk(" failed.\n");
printk(KERN_INFO "...trying to set up timer as ExtINT IRQ...");
timer_ack = 0;
init_8259A(0);
make_8259A_irq(0);
apic_write_around(APIC_LVT0, APIC_DM_EXTINT);
unlock_ExtINT_logic();
if (timer_irq_works()) {
printk(" works.\n");
return;
}
printk(" failed :(.\n");
panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
"report. Then try booting with the 'noapic' option");
}
/*
*
* IRQ's that are handled by the PIC in the MPS IOAPIC case.
* - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
* Linux doesn't really care, as it's not actually used
* for any interrupt handling anyway.
*/
#define PIC_IRQS (1 << PIC_CASCADE_IR)
void __init setup_IO_APIC(void)
{
enable_IO_APIC();
if (acpi_ioapic)
io_apic_irqs = ~0; /* all IRQs go through IOAPIC */
else
io_apic_irqs = ~PIC_IRQS;
printk("ENABLING IO-APIC IRQs\n");
/*
* Set up IO-APIC IRQ routing.
*/
if (!acpi_ioapic)
setup_ioapic_ids_from_mpc();
sync_Arb_IDs();
setup_IO_APIC_irqs();
init_IO_APIC_traps();
check_timer();
if (!acpi_ioapic)
print_IO_APIC();
}
static int __init setup_disable_8254_timer(char *s)
{
timer_over_8254 = -1;
return 1;
}
static int __init setup_enable_8254_timer(char *s)
{
timer_over_8254 = 2;
return 1;
}
__setup("disable_8254_timer", setup_disable_8254_timer);
__setup("enable_8254_timer", setup_enable_8254_timer);
/*
* Called after all the initialization is done. If we didnt find any
* APIC bugs then we can allow the modify fast path
*/
static int __init io_apic_bug_finalize(void)
{
if(sis_apic_bug == -1)
sis_apic_bug = 0;
return 0;
}
late_initcall(io_apic_bug_finalize);
struct sysfs_ioapic_data {
struct sys_device dev;
struct IO_APIC_route_entry entry[0];
};
static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
{
struct IO_APIC_route_entry *entry;
struct sysfs_ioapic_data *data;
int i;
data = container_of(dev, struct sysfs_ioapic_data, dev);
entry = data->entry;
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
entry[i] = ioapic_read_entry(dev->id, i);
return 0;
}
static int ioapic_resume(struct sys_device *dev)
{
struct IO_APIC_route_entry *entry;
struct sysfs_ioapic_data *data;
unsigned long flags;
union IO_APIC_reg_00 reg_00;
int i;
data = container_of(dev, struct sysfs_ioapic_data, dev);
entry = data->entry;
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(dev->id, 0);
if (reg_00.bits.ID != mp_ioapics[dev->id].mpc_apicid) {
reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
io_apic_write(dev->id, 0, reg_00.raw);
}
spin_unlock_irqrestore(&ioapic_lock, flags);
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++)
ioapic_write_entry(dev->id, i, entry[i]);
return 0;
}
static struct sysdev_class ioapic_sysdev_class = {
set_kset_name("ioapic"),
.suspend = ioapic_suspend,
.resume = ioapic_resume,
};
static int __init ioapic_init_sysfs(void)
{
struct sys_device * dev;
int i, size, error = 0;
error = sysdev_class_register(&ioapic_sysdev_class);
if (error)
return error;
for (i = 0; i < nr_ioapics; i++ ) {
size = sizeof(struct sys_device) + nr_ioapic_registers[i]
* sizeof(struct IO_APIC_route_entry);
mp_ioapic_data[i] = kmalloc(size, GFP_KERNEL);
if (!mp_ioapic_data[i]) {
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
continue;
}
memset(mp_ioapic_data[i], 0, size);
dev = &mp_ioapic_data[i]->dev;
dev->id = i;
dev->cls = &ioapic_sysdev_class;
error = sysdev_register(dev);
if (error) {
kfree(mp_ioapic_data[i]);
mp_ioapic_data[i] = NULL;
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
continue;
}
}
return 0;
}
device_initcall(ioapic_init_sysfs);
/*
* Dynamic irq allocate and deallocation
*/
int create_irq(void)
{
/* Allocate an unused irq */
int irq, new, vector;
unsigned long flags;
irq = -ENOSPC;
spin_lock_irqsave(&vector_lock, flags);
for (new = (NR_IRQS - 1); new >= 0; new--) {
if (platform_legacy_irq(new))
continue;
if (irq_vector[new] != 0)
continue;
vector = __assign_irq_vector(new);
if (likely(vector > 0))
irq = new;
break;
}
spin_unlock_irqrestore(&vector_lock, flags);
if (irq >= 0) {
set_intr_gate(vector, interrupt[irq]);
dynamic_irq_init(irq);
}
return irq;
}
void destroy_irq(unsigned int irq)
{
unsigned long flags;
dynamic_irq_cleanup(irq);
spin_lock_irqsave(&vector_lock, flags);
irq_vector[irq] = 0;
spin_unlock_irqrestore(&vector_lock, flags);
}
/*
* MSI mesage composition
*/
#ifdef CONFIG_PCI_MSI
static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
{
int vector;
unsigned dest;
vector = assign_irq_vector(irq);
if (vector >= 0) {
dest = cpu_mask_to_apicid(TARGET_CPUS);
msg->address_hi = MSI_ADDR_BASE_HI;
msg->address_lo =
MSI_ADDR_BASE_LO |
((INT_DEST_MODE == 0) ?
MSI_ADDR_DEST_MODE_PHYSICAL:
MSI_ADDR_DEST_MODE_LOGICAL) |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
MSI_ADDR_REDIRECTION_CPU:
MSI_ADDR_REDIRECTION_LOWPRI) |
MSI_ADDR_DEST_ID(dest);
msg->data =
MSI_DATA_TRIGGER_EDGE |
MSI_DATA_LEVEL_ASSERT |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
MSI_DATA_DELIVERY_FIXED:
MSI_DATA_DELIVERY_LOWPRI) |
MSI_DATA_VECTOR(vector);
}
return vector;
}
#ifdef CONFIG_SMP
static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
{
struct msi_msg msg;
unsigned int dest;
cpumask_t tmp;
int vector;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
vector = assign_irq_vector(irq);
if (vector < 0)
return;
dest = cpu_mask_to_apicid(mask);
read_msi_msg(irq, &msg);
msg.data &= ~MSI_DATA_VECTOR_MASK;
msg.data |= MSI_DATA_VECTOR(vector);
msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
write_msi_msg(irq, &msg);
set_native_irq_info(irq, mask);
}
#endif /* CONFIG_SMP */
/*
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI or MSI-X Capability Structure.
*/
static struct irq_chip msi_chip = {
.name = "PCI-MSI",
.unmask = unmask_msi_irq,
.mask = mask_msi_irq,
.ack = ack_ioapic_irq,
#ifdef CONFIG_SMP
.set_affinity = set_msi_irq_affinity,
#endif
.retrigger = ioapic_retrigger_irq,
};
int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev)
{
struct msi_msg msg;
int ret;
ret = msi_compose_msg(dev, irq, &msg);
if (ret < 0)
return ret;
write_msi_msg(irq, &msg);
set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq,
"edge");
return 0;
}
void arch_teardown_msi_irq(unsigned int irq)
{
return;
}
#endif /* CONFIG_PCI_MSI */
/*
* Hypertransport interrupt support
*/
#ifdef CONFIG_HT_IRQ
#ifdef CONFIG_SMP
static void target_ht_irq(unsigned int irq, unsigned int dest)
{
struct ht_irq_msg msg;
fetch_ht_irq_msg(irq, &msg);
msg.address_lo &= ~(HT_IRQ_LOW_DEST_ID_MASK);
msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
msg.address_lo |= HT_IRQ_LOW_DEST_ID(dest);
msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
write_ht_irq_msg(irq, &msg);
}
static void set_ht_irq_affinity(unsigned int irq, cpumask_t mask)
{
unsigned int dest;
cpumask_t tmp;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(mask, tmp, CPU_MASK_ALL);
dest = cpu_mask_to_apicid(mask);
target_ht_irq(irq, dest);
set_native_irq_info(irq, mask);
}
#endif
static struct irq_chip ht_irq_chip = {
.name = "PCI-HT",
.mask = mask_ht_irq,
.unmask = unmask_ht_irq,
.ack = ack_ioapic_irq,
#ifdef CONFIG_SMP
.set_affinity = set_ht_irq_affinity,
#endif
.retrigger = ioapic_retrigger_irq,
};
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
{
int vector;
vector = assign_irq_vector(irq);
if (vector >= 0) {
struct ht_irq_msg msg;
unsigned dest;
cpumask_t tmp;
cpus_clear(tmp);
cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
msg.address_lo =
HT_IRQ_LOW_BASE |
HT_IRQ_LOW_DEST_ID(dest) |
HT_IRQ_LOW_VECTOR(vector) |
((INT_DEST_MODE == 0) ?
HT_IRQ_LOW_DM_PHYSICAL :
HT_IRQ_LOW_DM_LOGICAL) |
HT_IRQ_LOW_RQEOI_EDGE |
((INT_DELIVERY_MODE != dest_LowestPrio) ?
HT_IRQ_LOW_MT_FIXED :
HT_IRQ_LOW_MT_ARBITRATED) |
HT_IRQ_LOW_IRQ_MASKED;
write_ht_irq_msg(irq, &msg);
set_irq_chip_and_handler_name(irq, &ht_irq_chip,
handle_edge_irq, "edge");
}
return vector;
}
#endif /* CONFIG_HT_IRQ */
/* --------------------------------------------------------------------------
ACPI-based IOAPIC Configuration
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI
int __init io_apic_get_unique_id (int ioapic, int apic_id)
{
union IO_APIC_reg_00 reg_00;
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
physid_mask_t tmp;
unsigned long flags;
int i = 0;
/*
* The P4 platform supports up to 256 APIC IDs on two separate APIC
* buses (one for LAPICs, one for IOAPICs), where predecessors only
* supports up to 16 on one shared APIC bus.
*
* TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
* advantage of new APIC bus architecture.
*/
if (physids_empty(apic_id_map))
apic_id_map = ioapic_phys_id_map(phys_cpu_present_map);
spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
if (apic_id >= get_physical_broadcast()) {
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
"%d\n", ioapic, apic_id, reg_00.bits.ID);
apic_id = reg_00.bits.ID;
}
/*
* Every APIC in a system must have a unique ID or we get lots of nice
* 'stuck on smp_invalidate_needed IPI wait' messages.
*/
if (check_apicid_used(apic_id_map, apic_id)) {
for (i = 0; i < get_physical_broadcast(); i++) {
if (!check_apicid_used(apic_id_map, i))
break;
}
if (i == get_physical_broadcast())
panic("Max apic_id exceeded!\n");
printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
"trying %d\n", ioapic, apic_id, i);
apic_id = i;
}
tmp = apicid_to_cpu_present(apic_id);
physids_or(apic_id_map, apic_id_map, tmp);
if (reg_00.bits.ID != apic_id) {
reg_00.bits.ID = apic_id;
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic, 0, reg_00.raw);
reg_00.raw = io_apic_read(ioapic, 0);
spin_unlock_irqrestore(&ioapic_lock, flags);
/* Sanity check */
if (reg_00.bits.ID != apic_id) {
printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
return -1;
}
}
apic_printk(APIC_VERBOSE, KERN_INFO
"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
return apic_id;
}
int __init io_apic_get_version (int ioapic)
{
union IO_APIC_reg_01 reg_01;
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
spin_unlock_irqrestore(&ioapic_lock, flags);
return reg_01.bits.version;
}
int __init io_apic_get_redir_entries (int ioapic)
{
union IO_APIC_reg_01 reg_01;
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
spin_unlock_irqrestore(&ioapic_lock, flags);
return reg_01.bits.entries;
}
int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int active_high_low)
{
struct IO_APIC_route_entry entry;
unsigned long flags;
if (!IO_APIC_IRQ(irq)) {
printk(KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
ioapic);
return -EINVAL;
}
/*
* Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
* Note that we mask (disable) IRQs now -- these get enabled when the
* corresponding device driver registers for this IRQ.
*/
memset(&entry,0,sizeof(entry));
entry.delivery_mode = INT_DELIVERY_MODE;
entry.dest_mode = INT_DEST_MODE;
entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
entry.trigger = edge_level;
entry.polarity = active_high_low;
entry.mask = 1;
/*
* IRQs < 16 are already in the irq_2_pin[] map
*/
if (irq >= 16)
add_pin_to_irq(irq, ioapic, pin);
entry.vector = assign_irq_vector(irq);
apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
"(%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,
edge_level, active_high_low);
ioapic_register_intr(irq, entry.vector, edge_level);
if (!ioapic && (irq < 16))
disable_8259A_irq(irq);
spin_lock_irqsave(&ioapic_lock, flags);
__ioapic_write_entry(ioapic, pin, entry);
set_native_irq_info(irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);
return 0;
}
#endif /* CONFIG_ACPI */
static int __init parse_disable_timer_pin_1(char *arg)
{
disable_timer_pin_1 = 1;
return 0;
}
early_param("disable_timer_pin_1", parse_disable_timer_pin_1);
static int __init parse_enable_timer_pin_1(char *arg)
{
disable_timer_pin_1 = -1;
return 0;
}
early_param("enable_timer_pin_1", parse_enable_timer_pin_1);
static int __init parse_noapic(char *arg)
{
/* disable IO-APIC */
disable_ioapic_setup();
return 0;
}
early_param("noapic", parse_noapic);
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