--- /dev/null
+/*
+ * 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/config.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 <asm/io.h>
+#include <asm/smp.h>
+#include <asm/desc.h>
+#include <asm/timer.h>
+#include <asm/i8259.h>
+
+#include <mach_apic.h>
+
+#include "io_ports.h"
+
+#ifdef CONFIG_XEN
+
+#include <xen/interface/xen.h>
+#include <xen/interface/physdev.h>
+
+/* Fake i8259 */
+#define make_8259A_irq(_irq) (io_apic_irqs &= ~(1UL<<(_irq)))
+#define disable_8259A_irq(_irq) ((void)0)
+#define i8259A_irq_pending(_irq) (0)
+
+unsigned long io_apic_irqs;
+
+static inline unsigned int xen_io_apic_read(unsigned int apic, unsigned int reg)
+{
+ struct physdev_apic apic_op;
+ int ret;
+
+ apic_op.apic_physbase = mp_ioapics[apic].mpc_apicaddr;
+ apic_op.reg = reg;
+ ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+ if (ret)
+ return ret;
+ return apic_op.value;
+}
+
+static inline void xen_io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
+{
+ struct physdev_apic apic_op;
+
+ apic_op.apic_physbase = mp_ioapics[apic].mpc_apicaddr;
+ apic_op.reg = reg;
+ apic_op.value = value;
+ HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
+}
+
+#define io_apic_read(a,r) xen_io_apic_read(a,r)
+#define io_apic_write(a,r,v) xen_io_apic_write(a,r,v)
+
+#endif /* CONFIG_XEN */
+
+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);
+
+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];
+
+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];
+
+int vector_irq[NR_VECTORS] __read_mostly = { [0 ... NR_VECTORS - 1] = -1};
+#ifdef CONFIG_PCI_MSI
+#define vector_to_irq(vector) \
+ (platform_legacy_irq(vector) ? vector : vector_irq[vector])
+#else
+#define vector_to_irq(vector) (vector)
+#endif
+
+/*
+ * 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;
+}
+
+#ifdef CONFIG_XEN
+#define clear_IO_APIC() ((void)0)
+#else
+/*
+ * 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;
+ unsigned long flags;
+
+ /* Check delivery_mode to be sure we're not clearing an SMI pin */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ *(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
+ *(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ if (entry.delivery_mode == dest_SMI)
+ return;
+
+ /*
+ * Disable it in the IO-APIC irq-routing table:
+ */
+ memset(&entry, 0, sizeof(entry));
+ entry.mask = 1;
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
+ io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+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_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
+static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH;
+static int physical_balance = 0;
+
+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]))
+
+#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 long balanced_irq_interval = MAX_BALANCED_IRQ_INTERVAL;
+
+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, 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, 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++) {
+ pending_irq_cpumask[i] = 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 */
+#endif
+
+#ifndef CONFIG_SMP
+void fastcall send_IPI_self(int vector)
+{
+#ifndef CONFIG_XEN
+ 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
+}
+#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
+#ifndef CONFIG_XEN
+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 /* !CONFIG_XEN */
+#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 }; */
+
+int assign_irq_vector(int irq)
+{
+ struct physdev_irq irq_op;
+
+ BUG_ON(irq >= NR_IRQ_VECTORS);
+ if (irq != AUTO_ASSIGN && IO_APIC_VECTOR(irq) > 0)
+ return IO_APIC_VECTOR(irq);
+
+ irq_op.irq = irq;
+ if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
+ return -ENOSPC;
+
+ vector_irq[irq_op.vector] = irq;
+ if (irq != AUTO_ASSIGN)
+ IO_APIC_VECTOR(irq) = irq_op.vector;
+
+ return irq_op.vector;
+}
+
+#ifndef CONFIG_XEN
+static struct hw_interrupt_type ioapic_level_type;
+static struct hw_interrupt_type ioapic_edge_type;
+
+#define IOAPIC_AUTO -1
+#define IOAPIC_EDGE 0
+#define IOAPIC_LEVEL 1
+
+static inline void ioapic_register_intr(int irq, int vector, unsigned long trigger)
+{
+ if (use_pci_vector() && !platform_legacy_irq(irq)) {
+ if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
+ trigger == IOAPIC_LEVEL)
+ irq_desc[vector].handler = &ioapic_level_type;
+ else
+ irq_desc[vector].handler = &ioapic_edge_type;
+ set_intr_gate(vector, interrupt[vector]);
+ } else {
+ if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
+ trigger == IOAPIC_LEVEL)
+ irq_desc[irq].handler = &ioapic_level_type;
+ else
+ irq_desc[irq].handler = &ioapic_edge_type;
+ set_intr_gate(vector, interrupt[irq]);
+ }
+}
+#else
+#define ioapic_register_intr(_irq,_vector,_trigger) ((void)0)
+#endif
+
+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);
+ io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
+ 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:
+ */
+#ifndef CONFIG_XEN
+static void __init setup_ExtINT_IRQ0_pin(unsigned int apic, unsigned int pin, int vector)
+{
+ struct IO_APIC_route_entry entry;
+ unsigned long flags;
+
+ 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].handler = &ioapic_edge_type;
+
+ /*
+ * Add it to the IO-APIC irq-routing table:
+ */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ 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;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ *(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
+ *(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ 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
+ );
+ }
+ }
+ if (use_pci_vector())
+ printk(KERN_INFO "Using vector-based indexing\n");
+ 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;
+ if (use_pci_vector() && !platform_legacy_irq(i))
+ printk(KERN_DEBUG "IRQ%d ", IO_APIC_VECTOR(i));
+ else
+ 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 */
+
+#else
+void __init print_IO_APIC(void) { }
+#endif /* !CONFIG_XEN */
+
+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;
+ spin_lock_irqsave(&ioapic_lock, flags);
+ *(((int *)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
+ *(((int *)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+
+ /* 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();
+
+#ifndef CONFIG_XEN
+ /*
+ * 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;
+ unsigned long flags;
+
+ 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:
+ */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(ioapic_i8259.apic, 0x11+2*ioapic_i8259.pin,
+ *(((int *)&entry)+1));
+ io_apic_write(ioapic_i8259.apic, 0x10+2*ioapic_i8259.pin,
+ *(((int *)&entry)+0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ }
+ disconnect_bsp_APIC(ioapic_i8259.pin != -1);
+#endif
+}
+
+/*
+ * 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
+ */
+
+#if !defined(CONFIG_XEN) && !defined(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
+
+#ifndef CONFIG_XEN
+/*
+ * 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.
+ */
+
+/*
+ * 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...
+ */
+static unsigned int startup_edge_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;
+}
+
+/*
+ * Once we have recorded IRQ_PENDING already, we can mask the
+ * interrupt for real. This prevents IRQ storms from unhandled
+ * devices.
+ */
+static void ack_edge_ioapic_irq(unsigned int irq)
+{
+ move_irq(irq);
+ if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
+ == (IRQ_PENDING | IRQ_DISABLED))
+ mask_IO_APIC_irq(irq);
+ ack_APIC_irq();
+}
+
+/*
+ * Level triggered interrupts can just be masked,
+ * and shutting down and starting up the interrupt
+ * is the same as enabling and disabling them -- except
+ * with a startup need to return a "was pending" value.
+ *
+ * Level triggered interrupts are special because we
+ * do not touch any IO-APIC register while handling
+ * them. We ack the APIC in the end-IRQ handler, not
+ * in the start-IRQ-handler. Protection against reentrance
+ * from the same interrupt is still provided, both by the
+ * generic IRQ layer and by the fact that an unacked local
+ * APIC does not accept IRQs.
+ */
+static unsigned int startup_level_ioapic_irq (unsigned int irq)
+{
+ unmask_IO_APIC_irq(irq);
+
+ return 0; /* don't check for pending */
+}
+
+static void end_level_ioapic_irq (unsigned int irq)
+{
+ unsigned long v;
+ int i;
+
+ move_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 = IO_APIC_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);
+ }
+}
+
+#ifdef CONFIG_PCI_MSI
+static unsigned int startup_edge_ioapic_vector(unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ return startup_edge_ioapic_irq(irq);
+}
+
+static void ack_edge_ioapic_vector(unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ move_native_irq(vector);
+ ack_edge_ioapic_irq(irq);
+}
+
+static unsigned int startup_level_ioapic_vector (unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ return startup_level_ioapic_irq (irq);
+}
+
+static void end_level_ioapic_vector (unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ move_native_irq(vector);
+ end_level_ioapic_irq(irq);
+}
+
+static void mask_IO_APIC_vector (unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ mask_IO_APIC_irq(irq);
+}
+
+static void unmask_IO_APIC_vector (unsigned int vector)
+{
+ int irq = vector_to_irq(vector);
+
+ unmask_IO_APIC_irq(irq);
+}
+
+#ifdef CONFIG_SMP
+static void set_ioapic_affinity_vector (unsigned int vector,
+ cpumask_t cpu_mask)
+{
+ int irq = vector_to_irq(vector);
+
+ set_native_irq_info(vector, cpu_mask);
+ set_ioapic_affinity_irq(irq, cpu_mask);
+}
+#endif
+#endif
+
+/*
+ * Level and edge triggered IO-APIC interrupts need different handling,
+ * so we use two separate IRQ descriptors. Edge triggered IRQs can be
+ * handled with the level-triggered descriptor, but that one has slightly
+ * more overhead. Level-triggered interrupts cannot be handled with the
+ * edge-triggered handler, without risking IRQ storms and other ugly
+ * races.
+ */
+static struct hw_interrupt_type ioapic_edge_type __read_mostly = {
+ .typename = "IO-APIC-edge",
+ .startup = startup_edge_ioapic,
+ .shutdown = shutdown_edge_ioapic,
+ .enable = enable_edge_ioapic,
+ .disable = disable_edge_ioapic,
+ .ack = ack_edge_ioapic,
+ .end = end_edge_ioapic,
+#ifdef CONFIG_SMP
+ .set_affinity = set_ioapic_affinity,
+#endif
+};
+
+static struct hw_interrupt_type ioapic_level_type __read_mostly = {
+ .typename = "IO-APIC-level",
+ .startup = startup_level_ioapic,
+ .shutdown = shutdown_level_ioapic,
+ .enable = enable_level_ioapic,
+ .disable = disable_level_ioapic,
+ .ack = mask_and_ack_level_ioapic,
+ .end = end_level_ioapic,
+#ifdef CONFIG_SMP
+ .set_affinity = set_ioapic_affinity,
+#endif
+};
+#endif /* !CONFIG_XEN */
+
+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 (use_pci_vector()) {
+ if (!platform_legacy_irq(tmp))
+ if ((tmp = vector_to_irq(tmp)) == -1)
+ continue;
+ }
+ if (IO_APIC_IRQ(tmp) && !IO_APIC_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);
+#ifndef CONFIG_XEN
+ else
+ /* Strange. Oh, well.. */
+ irq_desc[irq].handler = &no_irq_type;
+#endif
+ }
+ }
+}
+
+#ifndef CONFIG_XEN
+static void enable_lapic_irq (unsigned int irq)
+{
+ unsigned long v;
+
+ v = apic_read(APIC_LVT0);
+ apic_write_around(APIC_LVT0, v & ~APIC_LVT_MASKED);
+}
+
+static void disable_lapic_irq (unsigned int irq)
+{
+ unsigned long v;
+
+ v = apic_read(APIC_LVT0);
+ apic_write_around(APIC_LVT0, v | APIC_LVT_MASKED);
+}
+
+static void ack_lapic_irq (unsigned int irq)
+{
+ ack_APIC_irq();
+}
+
+static void end_lapic_irq (unsigned int i) { /* nothing */ }
+
+static struct hw_interrupt_type lapic_irq_type __read_mostly = {
+ .typename = "local-APIC-edge",
+ .startup = NULL, /* startup_irq() not used for IRQ0 */
+ .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
+ .enable = enable_lapic_irq,
+ .disable = disable_lapic_irq,
+ .ack = ack_lapic_irq,
+ .end = end_lapic_irq
+};
+
+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;
+ unsigned long flags;
+
+ pin = find_isa_irq_pin(8, mp_INT);
+ apic = find_isa_irq_apic(8, mp_INT);
+ if (pin == -1)
+ return;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ *(((int *)&entry0) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
+ *(((int *)&entry0) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ 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;
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry1) + 1));
+ io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry1) + 0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ 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);
+
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry0) + 1));
+ io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry0) + 0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+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);
+ irq_desc[0].handler = &lapic_irq_type;
+ 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");
+}
+#else
+int timer_uses_ioapic_pin_0;
+#define check_timer() ((void)0)
+#endif
+
+/*
+ *
+ * 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();
+#ifndef CONFIG_XEN
+ sync_Arb_IDs();
+#endif
+ 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;
+ if (xen_start_info->flags & SIF_INITDOMAIN) {
+ dom0_op_t op = { .cmd = DOM0_PLATFORM_QUIRK };
+ op.u.platform_quirk.quirk_id = sis_apic_bug ?
+ QUIRK_IOAPIC_BAD_REGSEL : QUIRK_IOAPIC_GOOD_REGSEL;
+ HYPERVISOR_dom0_op(&op);
+ }
+ 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;
+ unsigned long flags;
+ int i;
+
+ data = container_of(dev, struct sysfs_ioapic_data, dev);
+ entry = data->entry;
+ spin_lock_irqsave(&ioapic_lock, flags);
+ for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
+ *(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i);
+ *(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i);
+ }
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ 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);
+ }
+ for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
+ io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1));
+ io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0));
+ }
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ 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);
+
+/* --------------------------------------------------------------------------
+ ACPI-based IOAPIC Configuration
+ -------------------------------------------------------------------------- */
+
+#ifdef CONFIG_ACPI
+
+int __init io_apic_get_unique_id (int ioapic, int apic_id)
+{
+#ifndef CONFIG_XEN
+ 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);
+#endif /* !CONFIG_XEN */
+
+ 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);
+ io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
+ set_native_irq_info(use_pci_vector() ? entry.vector : irq, TARGET_CPUS);
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+
+ return 0;
+}
+
+#endif /* CONFIG_ACPI */
git://git.onelab.eu / linux-2.6.git / blobdiff