/*
- * linux/arch/ia64/kernel/irq.c
+ * linux/arch/ia64/kernel/irq_ia64.c
*
* Copyright (C) 1998-2001 Hewlett-Packard Co
* Stephane Eranian <eranian@hpl.hp.com>
* Added CPU Hotplug handling for IPF.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel_stat.h>
-#include <linux/slab.h>
#include <linux/ptrace.h>
#include <linux/random.h> /* for rand_initialize_irq() */
#include <linux/signal.h>
#include <linux/smp.h>
-#include <linux/smp_lock.h>
#include <linux/threads.h>
#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <linux/ratelimit.h>
+#include <linux/acpi.h>
+#include <linux/sched.h>
#include <asm/delay.h>
#include <asm/intrinsics.h>
#include <asm/hw_irq.h>
#include <asm/machvec.h>
#include <asm/pgtable.h>
-#include <asm/system.h>
+#include <asm/tlbflush.h>
#ifdef CONFIG_PERFMON
# include <asm/perfmon.h>
#define IRQ_DEBUG 0
+#define IRQ_VECTOR_UNASSIGNED (0)
+
+#define IRQ_UNUSED (0)
+#define IRQ_USED (1)
+#define IRQ_RSVD (2)
+
/* These can be overridden in platform_irq_init */
int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR;
int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR;
void __iomem *ipi_base_addr = ((void __iomem *)
(__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR));
+static cpumask_t vector_allocation_domain(int cpu);
+
/*
* Legacy IRQ to IA-64 vector translation table.
*/
};
EXPORT_SYMBOL(isa_irq_to_vector_map);
-static unsigned long ia64_vector_mask[BITS_TO_LONGS(IA64_MAX_DEVICE_VECTORS)];
+DEFINE_SPINLOCK(vector_lock);
-int
-assign_irq_vector (int irq)
+struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
+ [0 ... NR_IRQS - 1] = {
+ .vector = IRQ_VECTOR_UNASSIGNED,
+ .domain = CPU_MASK_NONE
+ }
+};
+
+DEFINE_PER_CPU(int[IA64_NUM_VECTORS], vector_irq) = {
+ [0 ... IA64_NUM_VECTORS - 1] = -1
+};
+
+static cpumask_t vector_table[IA64_NUM_VECTORS] = {
+ [0 ... IA64_NUM_VECTORS - 1] = CPU_MASK_NONE
+};
+
+static int irq_status[NR_IRQS] = {
+ [0 ... NR_IRQS -1] = IRQ_UNUSED
+};
+
+int check_irq_used(int irq)
+{
+ if (irq_status[irq] == IRQ_USED)
+ return 1;
+
+ return -1;
+}
+
+static inline int find_unassigned_irq(void)
+{
+ int irq;
+
+ for (irq = IA64_FIRST_DEVICE_VECTOR; irq < NR_IRQS; irq++)
+ if (irq_status[irq] == IRQ_UNUSED)
+ return irq;
+ return -ENOSPC;
+}
+
+static inline int find_unassigned_vector(cpumask_t domain)
{
+ cpumask_t mask;
int pos, vector;
- again:
- pos = find_first_zero_bit(ia64_vector_mask, IA64_NUM_DEVICE_VECTORS);
- vector = IA64_FIRST_DEVICE_VECTOR + pos;
- if (vector > IA64_LAST_DEVICE_VECTOR)
- return -ENOSPC;
- if (test_and_set_bit(pos, ia64_vector_mask))
- goto again;
+
+ cpumask_and(&mask, &domain, cpu_online_mask);
+ if (cpus_empty(mask))
+ return -EINVAL;
+
+ for (pos = 0; pos < IA64_NUM_DEVICE_VECTORS; pos++) {
+ vector = IA64_FIRST_DEVICE_VECTOR + pos;
+ cpus_and(mask, domain, vector_table[vector]);
+ if (!cpus_empty(mask))
+ continue;
+ return vector;
+ }
+ return -ENOSPC;
+}
+
+static int __bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+ cpumask_t mask;
+ int cpu;
+ struct irq_cfg *cfg = &irq_cfg[irq];
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ BUG_ON((unsigned)vector >= IA64_NUM_VECTORS);
+
+ cpumask_and(&mask, &domain, cpu_online_mask);
+ if (cpus_empty(mask))
+ return -EINVAL;
+ if ((cfg->vector == vector) && cpus_equal(cfg->domain, domain))
+ return 0;
+ if (cfg->vector != IRQ_VECTOR_UNASSIGNED)
+ return -EBUSY;
+ for_each_cpu_mask(cpu, mask)
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ cfg->vector = vector;
+ cfg->domain = domain;
+ irq_status[irq] = IRQ_USED;
+ cpus_or(vector_table[vector], vector_table[vector], domain);
+ return 0;
+}
+
+int bind_irq_vector(int irq, int vector, cpumask_t domain)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ ret = __bind_irq_vector(irq, vector, domain);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return ret;
+}
+
+static void __clear_irq_vector(int irq)
+{
+ int vector, cpu;
+ cpumask_t mask;
+ cpumask_t domain;
+ struct irq_cfg *cfg = &irq_cfg[irq];
+
+ BUG_ON((unsigned)irq >= NR_IRQS);
+ BUG_ON(cfg->vector == IRQ_VECTOR_UNASSIGNED);
+ vector = cfg->vector;
+ domain = cfg->domain;
+ cpumask_and(&mask, &cfg->domain, cpu_online_mask);
+ for_each_cpu_mask(cpu, mask)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+ cfg->vector = IRQ_VECTOR_UNASSIGNED;
+ cfg->domain = CPU_MASK_NONE;
+ irq_status[irq] = IRQ_UNUSED;
+ cpus_andnot(vector_table[vector], vector_table[vector], domain);
+}
+
+static void clear_irq_vector(int irq)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __clear_irq_vector(irq);
+ spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+int
+ia64_native_assign_irq_vector (int irq)
+{
+ unsigned long flags;
+ int vector, cpu;
+ cpumask_t domain = CPU_MASK_NONE;
+
+ vector = -ENOSPC;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ for_each_online_cpu(cpu) {
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector >= 0)
+ break;
+ }
+ if (vector < 0)
+ goto out;
+ if (irq == AUTO_ASSIGN)
+ irq = vector;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+ spin_unlock_irqrestore(&vector_lock, flags);
return vector;
}
void
-free_irq_vector (int vector)
+ia64_native_free_irq_vector (int vector)
{
- int pos;
-
- if (vector < IA64_FIRST_DEVICE_VECTOR || vector > IA64_LAST_DEVICE_VECTOR)
+ if (vector < IA64_FIRST_DEVICE_VECTOR ||
+ vector > IA64_LAST_DEVICE_VECTOR)
return;
-
- pos = vector - IA64_FIRST_DEVICE_VECTOR;
- if (!test_and_clear_bit(pos, ia64_vector_mask))
- printk(KERN_WARNING "%s: double free!\n", __FUNCTION__);
+ clear_irq_vector(vector);
}
int
reserve_irq_vector (int vector)
{
- int pos;
-
if (vector < IA64_FIRST_DEVICE_VECTOR ||
vector > IA64_LAST_DEVICE_VECTOR)
return -EINVAL;
+ return !!bind_irq_vector(vector, vector, CPU_MASK_ALL);
+}
+
+/*
+ * Initialize vector_irq on a new cpu. This function must be called
+ * with vector_lock held.
+ */
+void __setup_vector_irq(int cpu)
+{
+ int irq, vector;
+
+ /* Clear vector_irq */
+ for (vector = 0; vector < IA64_NUM_VECTORS; ++vector)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+ /* Mark the inuse vectors */
+ for (irq = 0; irq < NR_IRQS; ++irq) {
+ if (!cpu_isset(cpu, irq_cfg[irq].domain))
+ continue;
+ vector = irq_to_vector(irq);
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ }
+}
+
+#if defined(CONFIG_SMP) && (defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG))
+
+static enum vector_domain_type {
+ VECTOR_DOMAIN_NONE,
+ VECTOR_DOMAIN_PERCPU
+} vector_domain_type = VECTOR_DOMAIN_NONE;
+
+static cpumask_t vector_allocation_domain(int cpu)
+{
+ if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
+ return cpumask_of_cpu(cpu);
+ return CPU_MASK_ALL;
+}
+
+static int __irq_prepare_move(int irq, int cpu)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ int vector;
+ cpumask_t domain;
+
+ if (cfg->move_in_progress || cfg->move_cleanup_count)
+ return -EBUSY;
+ if (cfg->vector == IRQ_VECTOR_UNASSIGNED || !cpu_online(cpu))
+ return -EINVAL;
+ if (cpu_isset(cpu, cfg->domain))
+ return 0;
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector < 0)
+ return -ENOSPC;
+ cfg->move_in_progress = 1;
+ cfg->old_domain = cfg->domain;
+ cfg->vector = IRQ_VECTOR_UNASSIGNED;
+ cfg->domain = CPU_MASK_NONE;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ return 0;
+}
+
+int irq_prepare_move(int irq, int cpu)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ ret = __irq_prepare_move(irq, cpu);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ return ret;
+}
+
+void irq_complete_move(unsigned irq)
+{
+ struct irq_cfg *cfg = &irq_cfg[irq];
+ cpumask_t cleanup_mask;
+ int i;
+
+ if (likely(!cfg->move_in_progress))
+ return;
+
+ if (unlikely(cpu_isset(smp_processor_id(), cfg->old_domain)))
+ return;
+
+ cpumask_and(&cleanup_mask, &cfg->old_domain, cpu_online_mask);
+ cfg->move_cleanup_count = cpus_weight(cleanup_mask);
+ for_each_cpu_mask(i, cleanup_mask)
+ platform_send_ipi(i, IA64_IRQ_MOVE_VECTOR, IA64_IPI_DM_INT, 0);
+ cfg->move_in_progress = 0;
+}
+
+static irqreturn_t smp_irq_move_cleanup_interrupt(int irq, void *dev_id)
+{
+ int me = smp_processor_id();
+ ia64_vector vector;
+ unsigned long flags;
+
+ for (vector = IA64_FIRST_DEVICE_VECTOR;
+ vector < IA64_LAST_DEVICE_VECTOR; vector++) {
+ int irq;
+ struct irq_desc *desc;
+ struct irq_cfg *cfg;
+ irq = __get_cpu_var(vector_irq)[vector];
+ if (irq < 0)
+ continue;
+
+ desc = irq_to_desc(irq);
+ cfg = irq_cfg + irq;
+ raw_spin_lock(&desc->lock);
+ if (!cfg->move_cleanup_count)
+ goto unlock;
+
+ if (!cpu_isset(me, cfg->old_domain))
+ goto unlock;
+
+ spin_lock_irqsave(&vector_lock, flags);
+ __get_cpu_var(vector_irq)[vector] = -1;
+ cpu_clear(me, vector_table[vector]);
+ spin_unlock_irqrestore(&vector_lock, flags);
+ cfg->move_cleanup_count--;
+ unlock:
+ raw_spin_unlock(&desc->lock);
+ }
+ return IRQ_HANDLED;
+}
+
+static struct irqaction irq_move_irqaction = {
+ .handler = smp_irq_move_cleanup_interrupt,
+ .flags = IRQF_DISABLED,
+ .name = "irq_move"
+};
+
+static int __init parse_vector_domain(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+ if (!strcmp(arg, "percpu")) {
+ vector_domain_type = VECTOR_DOMAIN_PERCPU;
+ no_int_routing = 1;
+ }
+ return 0;
+}
+early_param("vector", parse_vector_domain);
+#else
+static cpumask_t vector_allocation_domain(int cpu)
+{
+ return CPU_MASK_ALL;
+}
+#endif
+
+
+void destroy_and_reserve_irq(unsigned int irq)
+{
+ unsigned long flags;
+
+ dynamic_irq_cleanup(irq);
- pos = vector - IA64_FIRST_DEVICE_VECTOR;
- return test_and_set_bit(pos, ia64_vector_mask);
+ spin_lock_irqsave(&vector_lock, flags);
+ __clear_irq_vector(irq);
+ irq_status[irq] = IRQ_RSVD;
+ spin_unlock_irqrestore(&vector_lock, flags);
+}
+
+/*
+ * Dynamic irq allocate and deallocation for MSI
+ */
+int create_irq(void)
+{
+ unsigned long flags;
+ int irq, vector, cpu;
+ cpumask_t domain = CPU_MASK_NONE;
+
+ irq = vector = -ENOSPC;
+ spin_lock_irqsave(&vector_lock, flags);
+ for_each_online_cpu(cpu) {
+ domain = vector_allocation_domain(cpu);
+ vector = find_unassigned_vector(domain);
+ if (vector >= 0)
+ break;
+ }
+ if (vector < 0)
+ goto out;
+ irq = find_unassigned_irq();
+ if (irq < 0)
+ goto out;
+ BUG_ON(__bind_irq_vector(irq, vector, domain));
+ out:
+ spin_unlock_irqrestore(&vector_lock, flags);
+ if (irq >= 0)
+ dynamic_irq_init(irq);
+ return irq;
+}
+
+void destroy_irq(unsigned int irq)
+{
+ dynamic_irq_cleanup(irq);
+ clear_irq_vector(irq);
}
#ifdef CONFIG_SMP
# define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE)
+# define IS_LOCAL_TLB_FLUSH(vec) (vec == IA64_IPI_LOCAL_TLB_FLUSH)
#else
# define IS_RESCHEDULE(vec) (0)
+# define IS_LOCAL_TLB_FLUSH(vec) (0)
#endif
/*
* That's where the IVT branches when we get an external
void
ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
{
+ struct pt_regs *old_regs = set_irq_regs(regs);
unsigned long saved_tpr;
#if IRQ_DEBUG
sp = ia64_getreg(_IA64_REG_SP);
if ((sp - bsp) < 1024) {
- static unsigned char count;
- static long last_time;
+ static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 5);
- if (jiffies - last_time > 5*HZ)
- count = 0;
- if (++count < 5) {
- last_time = jiffies;
+ if (__ratelimit(&ratelimit)) {
printk("ia64_handle_irq: DANGER: less than "
"1KB of free stack space!!\n"
"(bsp=0x%lx, sp=%lx)\n", bsp, sp);
saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
ia64_srlz_d();
while (vector != IA64_SPURIOUS_INT_VECTOR) {
- if (!IS_RESCHEDULE(vector)) {
+ int irq = local_vector_to_irq(vector);
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
+ smp_local_flush_tlb();
+ kstat_incr_irqs_this_cpu(irq, desc);
+ } else if (unlikely(IS_RESCHEDULE(vector))) {
+ scheduler_ipi();
+ kstat_incr_irqs_this_cpu(irq, desc);
+ } else {
ia64_setreg(_IA64_REG_CR_TPR, vector);
ia64_srlz_d();
- __do_IRQ(local_vector_to_irq(vector), regs);
+ if (unlikely(irq < 0)) {
+ printk(KERN_ERR "%s: Unexpected interrupt "
+ "vector %d on CPU %d is not mapped "
+ "to any IRQ!\n", __func__, vector,
+ smp_processor_id());
+ } else
+ generic_handle_irq(irq);
/*
* Disable interrupts and send EOI:
* come through until ia64_eoi() has been done.
*/
irq_exit();
+ set_irq_regs(old_regs);
}
#ifdef CONFIG_HOTPLUG_CPU
vector = ia64_get_ivr();
- irq_enter();
- saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
- ia64_srlz_d();
+ irq_enter();
+ saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
+ ia64_srlz_d();
/*
* Perform normal interrupt style processing
*/
while (vector != IA64_SPURIOUS_INT_VECTOR) {
- if (!IS_RESCHEDULE(vector)) {
+ int irq = local_vector_to_irq(vector);
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (unlikely(IS_LOCAL_TLB_FLUSH(vector))) {
+ smp_local_flush_tlb();
+ kstat_incr_irqs_this_cpu(irq, desc);
+ } else if (unlikely(IS_RESCHEDULE(vector))) {
+ kstat_incr_irqs_this_cpu(irq, desc);
+ } else {
+ struct pt_regs *old_regs = set_irq_regs(NULL);
+
ia64_setreg(_IA64_REG_CR_TPR, vector);
ia64_srlz_d();
* it will work. I hope it works!.
* Probably could shared code.
*/
- vectors_in_migration[local_vector_to_irq(vector)]=0;
- __do_IRQ(local_vector_to_irq(vector), NULL);
+ if (unlikely(irq < 0)) {
+ printk(KERN_ERR "%s: Unexpected interrupt "
+ "vector %d on CPU %d not being mapped "
+ "to any IRQ!!\n", __func__, vector,
+ smp_processor_id());
+ } else {
+ vectors_in_migration[irq]=0;
+ generic_handle_irq(irq);
+ }
+ set_irq_regs(old_regs);
/*
* Disable interrupts and send EOI
#ifdef CONFIG_SMP
-extern irqreturn_t handle_IPI (int irq, void *dev_id, struct pt_regs *regs);
+
+static irqreturn_t dummy_handler (int irq, void *dev_id)
+{
+ BUG();
+}
static struct irqaction ipi_irqaction = {
.handler = handle_IPI,
- .flags = SA_INTERRUPT,
+ .flags = IRQF_DISABLED,
.name = "IPI"
};
+
+/*
+ * KVM uses this interrupt to force a cpu out of guest mode
+ */
+static struct irqaction resched_irqaction = {
+ .handler = dummy_handler,
+ .flags = IRQF_DISABLED,
+ .name = "resched"
+};
+
+static struct irqaction tlb_irqaction = {
+ .handler = dummy_handler,
+ .flags = IRQF_DISABLED,
+ .name = "tlb_flush"
+};
+
#endif
void
-register_percpu_irq (ia64_vector vec, struct irqaction *action)
+ia64_native_register_percpu_irq (ia64_vector vec, struct irqaction *action)
{
- irq_desc_t *desc;
unsigned int irq;
- for (irq = 0; irq < NR_IRQS; ++irq)
- if (irq_to_vector(irq) == vec) {
- desc = irq_desc + irq;
- desc->status |= IRQ_PER_CPU;
- desc->chip = &irq_type_ia64_lsapic;
- if (action)
- setup_irq(irq, action);
- }
+ irq = vec;
+ BUG_ON(bind_irq_vector(irq, vec, CPU_MASK_ALL));
+ irq_set_status_flags(irq, IRQ_PER_CPU);
+ irq_set_chip(irq, &irq_type_ia64_lsapic);
+ if (action)
+ setup_irq(irq, action);
+ irq_set_handler(irq, handle_percpu_irq);
+}
+
+void __init
+ia64_native_register_ipi(void)
+{
+#ifdef CONFIG_SMP
+ register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
+ register_percpu_irq(IA64_IPI_RESCHEDULE, &resched_irqaction);
+ register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &tlb_irqaction);
+#endif
}
void __init
init_IRQ (void)
{
+#ifdef CONFIG_ACPI
+ acpi_boot_init();
+#endif
+ ia64_register_ipi();
register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL);
#ifdef CONFIG_SMP
- register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction);
+#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_DIG)
+ if (vector_domain_type != VECTOR_DOMAIN_NONE)
+ register_percpu_irq(IA64_IRQ_MOVE_VECTOR, &irq_move_irqaction);
+#endif
#endif
#ifdef CONFIG_PERFMON
pfm_init_percpu();
unsigned long ipi_data;
unsigned long phys_cpu_id;
-#ifdef CONFIG_SMP
phys_cpu_id = cpu_physical_id(cpu);
-#else
- phys_cpu_id = (ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff;
-#endif
/*
* cpu number is in 8bit ID and 8bit EID
projects / linux-flexiantxendom0-3.2.10.git / blobdiff