#include <linux/config.h>
#include <linux/errno.h>
#include <linux/module.h>
-#ifndef XEN
-#include <linux/signal.h>
-#endif
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/slab.h>
-#ifndef XEN
-#include <linux/random.h>
-#include <linux/cpu.h>
-#endif
#include <linux/ctype.h>
-#ifndef XEN
-#include <linux/smp_lock.h>
-#endif
#include <linux/init.h>
-#ifndef XEN
-#include <linux/kernel_stat.h>
-#endif
#include <linux/irq.h>
-#ifndef XEN
-#include <linux/proc_fs.h>
-#endif
#include <linux/seq_file.h>
-#ifndef XEN
-#include <linux/kallsyms.h>
-#include <linux/notifier.h>
-#endif
#include <asm/atomic.h>
-#ifndef XEN
-#include <asm/cpu.h>
-#endif
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
-#ifndef XEN
-#include <asm/tlbflush.h>
-#endif
#include <asm/delay.h>
#include <asm/irq.h>
-#ifdef XEN
#include <xen/event.h>
#define _irq_desc irq_desc
#define irq_descp(irq) &irq_desc[irq]
#define apicid_to_phys_cpu_present(x) 1
-#endif
-
/*
* Linux has a controller-independent x86 interrupt architecture.
*/
irq_desc_t _irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
- .status = IRQ_DISABLED,
+ .status = IRQ_DISABLED | IRQ_GUEST,
.handler = &no_irq_type,
.lock = SPIN_LOCK_UNLOCKED
}
};
-/*
- * This is updated when the user sets irq affinity via /proc
- */
-cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
-
-#ifdef CONFIG_IA64_GENERIC
-irq_desc_t * __ia64_irq_desc (unsigned int irq)
-{
- return _irq_desc + irq;
-}
-
-ia64_vector __ia64_irq_to_vector (unsigned int irq)
-{
- return (ia64_vector) irq;
-}
-
-unsigned int __ia64_local_vector_to_irq (ia64_vector vec)
-{
- return (unsigned int) vec;
-}
-#endif
-
-#ifndef XEN
-static void register_irq_proc (unsigned int irq);
-#endif
-
/*
* Special irq handlers.
*/
-#ifdef XEN
void no_action(int cpl, void *dev_id, struct pt_regs *regs) { }
-#else
-irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs)
-{ return IRQ_NONE; }
-#endif
/*
* Generic no controller code
* each architecture has to answer this themselves, it doesn't deserve
* a generic callback i think.
*/
-#ifdef CONFIG_X86
- printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
-#ifdef CONFIG_X86_LOCAL_APIC
- /*
- * Currently unexpected vectors happen only on SMP and APIC.
- * We _must_ ack these because every local APIC has only N
- * irq slots per priority level, and a 'hanging, unacked' IRQ
- * holds up an irq slot - in excessive cases (when multiple
- * unexpected vectors occur) that might lock up the APIC
- * completely.
- */
- ack_APIC_irq();
-#endif
-#endif
-#ifdef CONFIG_IA64
printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id());
-#endif
}
/* startup is the same as "enable", shutdown is same as "disable" */
};
atomic_t irq_err_count;
-#ifdef CONFIG_X86_IO_APIC
-#ifdef APIC_MISMATCH_DEBUG
-atomic_t irq_mis_count;
-#endif
-#endif
-/*
- * Generic, controller-independent functions:
+/* Some placeholder here, which are used by other files and we
+ * don't want to change too much now. Later they should be cleaned.
*/
-
-#ifndef XEN
-int show_interrupts(struct seq_file *p, void *v)
-{
- int j, i = *(loff_t *) v;
- struct irqaction * action;
- irq_desc_t *idesc;
- unsigned long flags;
-
- if (i == 0) {
- seq_puts(p, " ");
- for (j=0; j<NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "CPU%d ",j);
- seq_putc(p, '\n');
- }
-
- if (i < NR_IRQS) {
- idesc = irq_descp(i);
- spin_lock_irqsave(&idesc->lock, flags);
- action = idesc->action;
- if (!action)
- goto skip;
- seq_printf(p, "%3d: ",i);
-#ifndef CONFIG_SMP
- seq_printf(p, "%10u ", kstat_irqs(i));
-#else
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
-#endif
- seq_printf(p, " %14s", idesc->handler->typename);
- seq_printf(p, " %s", action->name);
-
- for (action=action->next; action; action = action->next)
- seq_printf(p, ", %s", action->name);
-
- seq_putc(p, '\n');
-skip:
- spin_unlock_irqrestore(&idesc->lock, flags);
- } else if (i == NR_IRQS) {
- seq_puts(p, "NMI: ");
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", nmi_count(j));
- seq_putc(p, '\n');
-#ifdef CONFIG_X86_LOCAL_APIC
- seq_puts(p, "LOC: ");
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", irq_stat[j].apic_timer_irqs);
- seq_putc(p, '\n');
-#endif
- seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
-#ifdef CONFIG_X86_IO_APIC
-#ifdef APIC_MISMATCH_DEBUG
- seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
-#endif
-#endif
- }
- return 0;
-}
-#endif
-
#ifdef CONFIG_SMP
-inline void synchronize_irq(unsigned int irq)
-{
-#ifndef XEN
- struct irq_desc *desc = irq_desc + irq;
-
- while (desc->status & IRQ_INPROGRESS)
- cpu_relax();
-#endif
-}
+inline void synchronize_irq(unsigned int irq) {}
EXPORT_SYMBOL(synchronize_irq);
#endif
-/*
- * This should really return information about whether
- * we should do bottom half handling etc. Right now we
- * end up _always_ checking the bottom half, which is a
- * waste of time and is not what some drivers would
- * prefer.
- */
-int handle_IRQ_event(unsigned int irq,
- struct pt_regs *regs, struct irqaction *action)
-{
-#ifndef XEN
- int status = 1; /* Force the "do bottom halves" bit */
-#endif
- int retval = 0;
-
-#ifndef XEN
- if (!(action->flags & SA_INTERRUPT))
-#endif
- local_irq_enable();
-
-#ifdef XEN
- action->handler(irq, action->dev_id, regs);
-#else
- do {
- status |= action->flags;
- retval |= action->handler(irq, action->dev_id, regs);
- action = action->next;
- } while (action);
- if (status & SA_SAMPLE_RANDOM)
- add_interrupt_randomness(irq);
-#endif
- local_irq_disable();
- return retval;
-}
-
-#ifndef XEN
-static void __report_bad_irq(int irq, irq_desc_t *desc, irqreturn_t action_ret)
-{
- struct irqaction *action;
-
- if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
- printk(KERN_ERR "irq event %d: bogus return value %x\n",
- irq, action_ret);
- } else {
- printk(KERN_ERR "irq %d: nobody cared!\n", irq);
- }
- dump_stack();
- printk(KERN_ERR "handlers:\n");
- action = desc->action;
- do {
- printk(KERN_ERR "[<%p>]", action->handler);
- print_symbol(" (%s)",
- (unsigned long)action->handler);
- printk("\n");
- action = action->next;
- } while (action);
-}
-
-static void report_bad_irq(int irq, irq_desc_t *desc, irqreturn_t action_ret)
-{
- static int count = 100;
-
- if (count) {
- count--;
- __report_bad_irq(irq, desc, action_ret);
- }
-}
-#endif
-
static int noirqdebug;
static int __init noirqdebug_setup(char *str)
__setup("noirqdebug", noirqdebug_setup);
-/*
- * If 99,900 of the previous 100,000 interrupts have not been handled then
- * assume that the IRQ is stuck in some manner. Drop a diagnostic and try to
- * turn the IRQ off.
- *
- * (The other 100-of-100,000 interrupts may have been a correctly-functioning
- * device sharing an IRQ with the failing one)
- *
- * Called under desc->lock
- */
-#ifndef XEN
-static void note_interrupt(int irq, irq_desc_t *desc, irqreturn_t action_ret)
-{
- if (action_ret != IRQ_HANDLED) {
- desc->irqs_unhandled++;
- if (action_ret != IRQ_NONE)
- report_bad_irq(irq, desc, action_ret);
- }
-
- desc->irq_count++;
- if (desc->irq_count < 100000)
- return;
-
- desc->irq_count = 0;
- if (desc->irqs_unhandled > 99900) {
- /*
- * The interrupt is stuck
- */
- __report_bad_irq(irq, desc, action_ret);
- /*
- * Now kill the IRQ
- */
- printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
- desc->status |= IRQ_DISABLED;
- desc->handler->disable(irq);
- }
- desc->irqs_unhandled = 0;
-}
-#endif
-
/*
* Generic enable/disable code: this just calls
* down into the PIC-specific version for the actual
* controller lock.
*/
-/**
- * disable_irq_nosync - disable an irq without waiting
- * @irq: Interrupt to disable
- *
- * Disable the selected interrupt line. Disables and Enables are
- * nested.
- * Unlike disable_irq(), this function does not ensure existing
- * instances of the IRQ handler have completed before returning.
- *
- * This function may be called from IRQ context.
- */
-
-inline void disable_irq_nosync(unsigned int irq)
-{
- irq_desc_t *desc = irq_descp(irq);
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
- if (!desc->depth++) {
- desc->status |= IRQ_DISABLED;
- desc->handler->disable(irq);
- }
- spin_unlock_irqrestore(&desc->lock, flags);
-}
-EXPORT_SYMBOL(disable_irq_nosync);
-
-/**
- * disable_irq - disable an irq and wait for completion
- * @irq: Interrupt to disable
- *
- * Disable the selected interrupt line. Enables and Disables are
- * nested.
- * This function waits for any pending IRQ handlers for this interrupt
- * to complete before returning. If you use this function while
- * holding a resource the IRQ handler may need you will deadlock.
- *
- * This function may be called - with care - from IRQ context.
- */
-
-void disable_irq(unsigned int irq)
-{
- irq_desc_t *desc = irq_descp(irq);
-
- disable_irq_nosync(irq);
- if (desc->action)
- synchronize_irq(irq);
-}
-EXPORT_SYMBOL(disable_irq);
-
-/**
- * enable_irq - enable handling of an irq
- * @irq: Interrupt to enable
- *
- * Undoes the effect of one call to disable_irq(). If this
- * matches the last disable, processing of interrupts on this
- * IRQ line is re-enabled.
- *
- * This function may be called from IRQ context.
- */
-
-void enable_irq(unsigned int irq)
-{
- irq_desc_t *desc = irq_descp(irq);
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
- switch (desc->depth) {
- case 1: {
- unsigned int status = desc->status & ~IRQ_DISABLED;
- desc->status = status;
-#ifndef XEN
- if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
- desc->status = status | IRQ_REPLAY;
- hw_resend_irq(desc->handler,irq);
- }
-#endif
- desc->handler->enable(irq);
- /* fall-through */
- }
- default:
- desc->depth--;
- break;
- case 0:
- printk(KERN_ERR "enable_irq(%u) unbalanced from %p\n",
- irq, (void *) __builtin_return_address(0));
- }
- spin_unlock_irqrestore(&desc->lock, flags);
-}
-EXPORT_SYMBOL(enable_irq);
-
/*
* do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
struct irqaction * action;
unsigned int status;
-#ifndef XEN
- kstat_this_cpu.irqs[irq]++;
-#endif
- if (desc->status & IRQ_PER_CPU) {
- irqreturn_t action_ret;
-
+ if (likely(desc->status & IRQ_PER_CPU)) {
/*
* No locking required for CPU-local interrupts:
*/
desc->handler->ack(irq);
- action_ret = handle_IRQ_event(irq, regs, desc->action);
-#ifndef XEN
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
-#endif
+ local_irq_enable();
+ desc->action->handler(irq, desc->action->dev_id, regs);
+ local_irq_disable();
desc->handler->end(irq);
return 1;
}
spin_lock(&desc->lock);
+
+ if (desc->status & IRQ_GUEST) {
+ /* __do_IRQ_guest(irq); */
+ vcpu_pend_interrupt(dom0->vcpu[0],irq);
+ vcpu_wake(dom0->vcpu[0]);
+ spin_unlock(&desc->lock);
+ return 1;
+ }
+
desc->handler->ack(irq);
- /*
- * REPLAY is when Linux resends an IRQ that was dropped earlier
- * WAITING is used by probe to mark irqs that are being tested
- */
-#ifdef XEN
status = desc->status & ~IRQ_REPLAY;
-#else
- status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING);
-#endif
status |= IRQ_PENDING; /* we _want_ to handle it */
/*
* SMP environment.
*/
for (;;) {
- irqreturn_t action_ret;
-
- spin_unlock(&desc->lock);
-
- action_ret = handle_IRQ_event(irq, regs, action);
+ spin_unlock_irq(&desc->lock);
+ action->handler(irq, action->dev_id, regs);
+ spin_lock_irq(&desc->lock);
- spin_lock(&desc->lock);
-#ifndef XEN
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
-#endif
if (likely(!(desc->status & IRQ_PENDING)))
break;
+
desc->status &= ~IRQ_PENDING;
}
desc->status &= ~IRQ_INPROGRESS;
int retval;
struct irqaction * action;
-#if 1
/*
* Sanity-check: shared interrupts should REALLY pass in
* a real dev-ID, otherwise we'll have trouble later trying
if (!dev_id)
printk(KERN_ERR "Bad boy: %s called us without a dev_id!\n", devname);
}
-#endif
if (irq >= NR_IRQS)
return -EINVAL;
if (!action)
return -ENOMEM;
-#ifdef XEN
action->handler = (void *) handler;
-#else
- action->handler = handler;
- action->flags = irqflags;
- action->mask = 0;
-#endif
action->name = devname;
-#ifndef XEN
- action->next = NULL;
-#endif
action->dev_id = dev_id;
retval = setup_irq(irq, action);
* This function must not be called from interrupt context.
*/
-#ifdef XEN
void free_irq(unsigned int irq)
-#else
-void free_irq(unsigned int irq, void *dev_id)
-#endif
{
irq_desc_t *desc;
-#ifndef XEN
- struct irqaction **p;
-#endif
unsigned long flags;
if (irq >= NR_IRQS)
desc = irq_descp(irq);
spin_lock_irqsave(&desc->lock,flags);
-#ifdef XEN
if (desc->action) {
struct irqaction * action = desc->action;
desc->action = NULL;
-#else
- p = &desc->action;
- for (;;) {
- struct irqaction * action = *p;
- if (action) {
- struct irqaction **pp = p;
- p = &action->next;
- if (action->dev_id != dev_id)
- continue;
-
- /* Found it - now remove it from the list of entries */
- *pp = action->next;
- if (!desc->action) {
-#endif
desc->status |= IRQ_DISABLED;
desc->handler->shutdown(irq);
-#ifndef XEN
- }
-#endif
spin_unlock_irqrestore(&desc->lock,flags);
/* Wait to make sure it's not being used on another CPU */
}
printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
spin_unlock_irqrestore(&desc->lock,flags);
-#ifndef XEN
- return;
- }
-#endif
}
EXPORT_SYMBOL(free_irq);
* disabled.
*/
-#ifndef XEN
-static int DECLARE_MUTEX(probe_sem);
-
-/**
- * probe_irq_on - begin an interrupt autodetect
- *
- * Commence probing for an interrupt. The interrupts are scanned
- * and a mask of potential interrupt lines is returned.
- *
- */
-
-unsigned long probe_irq_on(void)
-{
- unsigned int i;
- irq_desc_t *desc;
- unsigned long val;
- unsigned long delay;
-
- down(&probe_sem);
- /*
- * something may have generated an irq long ago and we want to
- * flush such a longstanding irq before considering it as spurious.
- */
- for (i = NR_IRQS-1; i > 0; i--) {
- desc = irq_descp(i);
-
- spin_lock_irq(&desc->lock);
- if (!desc->action)
- desc->handler->startup(i);
- spin_unlock_irq(&desc->lock);
- }
-
- /* Wait for longstanding interrupts to trigger. */
- for (delay = jiffies + HZ/50; time_after(delay, jiffies); )
- /* about 20ms delay */ barrier();
-
- /*
- * enable any unassigned irqs
- * (we must startup again here because if a longstanding irq
- * happened in the previous stage, it may have masked itself)
- */
- for (i = NR_IRQS-1; i > 0; i--) {
- desc = irq_descp(i);
-
- spin_lock_irq(&desc->lock);
- if (!desc->action) {
- desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
- if (desc->handler->startup(i))
- desc->status |= IRQ_PENDING;
- }
- spin_unlock_irq(&desc->lock);
- }
-
- /*
- * Wait for spurious interrupts to trigger
- */
- for (delay = jiffies + HZ/10; time_after(delay, jiffies); )
- /* about 100ms delay */ barrier();
-
- /*
- * Now filter out any obviously spurious interrupts
- */
- val = 0;
- for (i = 0; i < NR_IRQS; i++) {
- irq_desc_t *desc = irq_descp(i);
- unsigned int status;
-
- spin_lock_irq(&desc->lock);
- status = desc->status;
-
- if (status & IRQ_AUTODETECT) {
- /* It triggered already - consider it spurious. */
- if (!(status & IRQ_WAITING)) {
- desc->status = status & ~IRQ_AUTODETECT;
- desc->handler->shutdown(i);
- } else
- if (i < 32)
- val |= 1 << i;
- }
- spin_unlock_irq(&desc->lock);
- }
-
- return val;
-}
-
-EXPORT_SYMBOL(probe_irq_on);
-
-/**
- * probe_irq_mask - scan a bitmap of interrupt lines
- * @val: mask of interrupts to consider
- *
- * Scan the ISA bus interrupt lines and return a bitmap of
- * active interrupts. The interrupt probe logic state is then
- * returned to its previous value.
- *
- * Note: we need to scan all the irq's even though we will
- * only return ISA irq numbers - just so that we reset them
- * all to a known state.
- */
-unsigned int probe_irq_mask(unsigned long val)
-{
- int i;
- unsigned int mask;
-
- mask = 0;
- for (i = 0; i < 16; i++) {
- irq_desc_t *desc = irq_descp(i);
- unsigned int status;
-
- spin_lock_irq(&desc->lock);
- status = desc->status;
-
- if (status & IRQ_AUTODETECT) {
- if (!(status & IRQ_WAITING))
- mask |= 1 << i;
-
- desc->status = status & ~IRQ_AUTODETECT;
- desc->handler->shutdown(i);
- }
- spin_unlock_irq(&desc->lock);
- }
- up(&probe_sem);
-
- return mask & val;
-}
-EXPORT_SYMBOL(probe_irq_mask);
-
-/**
- * probe_irq_off - end an interrupt autodetect
- * @val: mask of potential interrupts (unused)
- *
- * Scans the unused interrupt lines and returns the line which
- * appears to have triggered the interrupt. If no interrupt was
- * found then zero is returned. If more than one interrupt is
- * found then minus the first candidate is returned to indicate
- * their is doubt.
- *
- * The interrupt probe logic state is returned to its previous
- * value.
- *
- * BUGS: When used in a module (which arguably shouldn't happen)
- * nothing prevents two IRQ probe callers from overlapping. The
- * results of this are non-optimal.
- */
-
-int probe_irq_off(unsigned long val)
-{
- int i, irq_found, nr_irqs;
-
- nr_irqs = 0;
- irq_found = 0;
- for (i = 0; i < NR_IRQS; i++) {
- irq_desc_t *desc = irq_descp(i);
- unsigned int status;
-
- spin_lock_irq(&desc->lock);
- status = desc->status;
-
- if (status & IRQ_AUTODETECT) {
- if (!(status & IRQ_WAITING)) {
- if (!nr_irqs)
- irq_found = i;
- nr_irqs++;
- }
- desc->status = status & ~IRQ_AUTODETECT;
- desc->handler->shutdown(i);
- }
- spin_unlock_irq(&desc->lock);
- }
- up(&probe_sem);
-
- if (nr_irqs > 1)
- irq_found = -irq_found;
- return irq_found;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-#endif
-
int setup_irq(unsigned int irq, struct irqaction * new)
{
-#ifndef XEN
- int shared = 0;
-#endif
unsigned long flags;
struct irqaction *old, **p;
irq_desc_t *desc = irq_descp(irq);
-#ifndef XEN
- if (desc->handler == &no_irq_type)
- return -ENOSYS;
- /*
- * Some drivers like serial.c use request_irq() heavily,
- * so we have to be careful not to interfere with a
- * running system.
- */
- if (new->flags & SA_SAMPLE_RANDOM) {
- /*
- * This function might sleep, we want to call it first,
- * outside of the atomic block.
- * Yes, this might clear the entropy pool if the wrong
- * driver is attempted to be loaded, without actually
- * installing a new handler, but is this really a problem,
- * only the sysadmin is able to do this.
- */
- rand_initialize_irq(irq);
- }
-
- if (new->flags & SA_PERCPU_IRQ) {
- desc->status |= IRQ_PER_CPU;
- desc->handler = &irq_type_ia64_lsapic;
- }
-#endif
-
/*
* The following block of code has to be executed atomically
*/
spin_lock_irqsave(&desc->lock,flags);
p = &desc->action;
if ((old = *p) != NULL) {
-#ifdef XEN
- if (1) {
- /* Can't share interrupts unless both agree to */
-#else
- if (!(old->flags & new->flags & SA_SHIRQ)) {
-#endif
- spin_unlock_irqrestore(&desc->lock,flags);
- return -EBUSY;
- }
-
-#ifndef XEN
- /* add new interrupt at end of irq queue */
- do {
- p = &old->next;
- old = *p;
- } while (old);
- shared = 1;
-#endif
+ spin_unlock_irqrestore(&desc->lock,flags);
+ return -EBUSY;
}
*p = new;
-#ifndef XEN
- if (!shared) {
-#else
- {
-#endif
- desc->depth = 0;
-#ifdef XEN
- desc->status &= ~(IRQ_DISABLED | IRQ_INPROGRESS);
-#else
- desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
-#endif
- desc->handler->startup(irq);
- }
+ desc->depth = 0;
+ desc->status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_GUEST);
+ desc->handler->startup(irq);
spin_unlock_irqrestore(&desc->lock,flags);
-#ifndef XEN
- register_irq_proc(irq);
-#endif
return 0;
}
-#ifndef XEN
-
-static struct proc_dir_entry * root_irq_dir;
-static struct proc_dir_entry * irq_dir [NR_IRQS];
-
-#ifdef CONFIG_SMP
-
-static struct proc_dir_entry * smp_affinity_entry [NR_IRQS];
-
-static cpumask_t irq_affinity [NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
-
-static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
-
-void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
-{
- cpumask_t mask = CPU_MASK_NONE;
-
- cpu_set(cpu_logical_id(hwid), mask);
-
- if (irq < NR_IRQS) {
- irq_affinity[irq] = mask;
- irq_redir[irq] = (char) (redir & 0xff);
- }
-}
-
-static int irq_affinity_read_proc (char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- int len = sprintf(page, "%s", irq_redir[(long)data] ? "r " : "");
-
- len += cpumask_scnprintf(page+len, count, irq_affinity[(long)data]);
- if (count - len < 2)
- return -EINVAL;
- len += sprintf(page + len, "\n");
- return len;
-}
-
-static int irq_affinity_write_proc (struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
- unsigned int irq = (unsigned long) data;
- int full_count = count, err;
- cpumask_t new_value, tmp;
-# define R_PREFIX_LEN 16
- char rbuf[R_PREFIX_LEN];
- int rlen;
- int prelen;
- irq_desc_t *desc = irq_descp(irq);
- unsigned long flags;
-
- if (!desc->handler->set_affinity)
- return -EIO;
-
- /*
- * If string being written starts with a prefix of 'r' or 'R'
- * and some limited number of spaces, set IA64_IRQ_REDIRECTED.
- * If more than (R_PREFIX_LEN - 2) spaces are passed, they won't
- * all be trimmed as part of prelen, the untrimmed spaces will
- * cause the hex parsing to fail, and this write() syscall will
- * fail with EINVAL.
- */
-
- if (!count)
- return -EINVAL;
- rlen = min(sizeof(rbuf)-1, count);
- if (copy_from_user(rbuf, buffer, rlen))
- return -EFAULT;
- rbuf[rlen] = 0;
- prelen = 0;
- if (tolower(*rbuf) == 'r') {
- prelen = strspn(rbuf, "Rr ");
- irq |= IA64_IRQ_REDIRECTED;
- }
-
- err = cpumask_parse(buffer+prelen, count-prelen, new_value);
- if (err)
- return err;
-
- /*
- * Do not allow disabling IRQs completely - it's a too easy
- * way to make the system unusable accidentally :-) At least
- * one online CPU still has to be targeted.
- */
- cpus_and(tmp, new_value, cpu_online_map);
- if (cpus_empty(tmp))
- return -EINVAL;
-
- spin_lock_irqsave(&desc->lock, flags);
- pending_irq_cpumask[irq] = new_value;
- spin_unlock_irqrestore(&desc->lock, flags);
-
- return full_count;
-}
-
-void move_irq(int irq)
-{
- /* note - we hold desc->lock */
- cpumask_t tmp;
- irq_desc_t *desc = irq_descp(irq);
-
- if (!cpus_empty(pending_irq_cpumask[irq])) {
- cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
- if (unlikely(!cpus_empty(tmp))) {
- desc->handler->set_affinity(irq, pending_irq_cpumask[irq]);
- }
- cpus_clear(pending_irq_cpumask[irq]);
- }
-}
-
-
-#endif /* CONFIG_SMP */
-#endif
-
-#ifdef CONFIG_HOTPLUG_CPU
-unsigned int vectors_in_migration[NR_IRQS];
-
-/*
- * Since cpu_online_map is already updated, we just need to check for
- * affinity that has zeros
- */
-static void migrate_irqs(void)
-{
- cpumask_t mask;
- irq_desc_t *desc;
- int irq, new_cpu;
-
- for (irq=0; irq < NR_IRQS; irq++) {
- desc = irq_descp(irq);
-
- /*
- * No handling for now.
- * TBD: Implement a disable function so we can now
- * tell CPU not to respond to these local intr sources.
- * such as ITV,CPEI,MCA etc.
- */
- if (desc->status == IRQ_PER_CPU)
- continue;
-
- cpus_and(mask, irq_affinity[irq], cpu_online_map);
- if (any_online_cpu(mask) == NR_CPUS) {
- /*
- * Save it for phase 2 processing
- */
- vectors_in_migration[irq] = irq;
-
- new_cpu = any_online_cpu(cpu_online_map);
- mask = cpumask_of_cpu(new_cpu);
-
- /*
- * Al three are essential, currently WARN_ON.. maybe panic?
- */
- if (desc->handler && desc->handler->disable &&
- desc->handler->enable && desc->handler->set_affinity) {
- desc->handler->disable(irq);
- desc->handler->set_affinity(irq, mask);
- desc->handler->enable(irq);
- } else {
- WARN_ON((!(desc->handler) || !(desc->handler->disable) ||
- !(desc->handler->enable) ||
- !(desc->handler->set_affinity)));
- }
- }
- }
-}
-
-void fixup_irqs(void)
-{
- unsigned int irq;
- extern void ia64_process_pending_intr(void);
-
- ia64_set_itv(1<<16);
- /*
- * Phase 1: Locate irq's bound to this cpu and
- * relocate them for cpu removal.
- */
- migrate_irqs();
-
- /*
- * Phase 2: Perform interrupt processing for all entries reported in
- * local APIC.
- */
- ia64_process_pending_intr();
-
- /*
- * Phase 3: Now handle any interrupts not captured in local APIC.
- * This is to account for cases that device interrupted during the time the
- * rte was being disabled and re-programmed.
- */
- for (irq=0; irq < NR_IRQS; irq++) {
- if (vectors_in_migration[irq]) {
- vectors_in_migration[irq]=0;
- do_IRQ(irq, NULL);
- }
- }
-
- /*
- * Now let processor die. We do irq disable and max_xtp() to
- * ensure there is no more interrupts routed to this processor.
- * But the local timer interrupt can have 1 pending which we
- * take care in timer_interrupt().
- */
- max_xtp();
- local_irq_disable();
-}
-#endif
-
-#ifndef XEN
-static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- int len = cpumask_scnprintf(page, count, *(cpumask_t *)data);
- if (count - len < 2)
- return -EINVAL;
- len += sprintf(page + len, "\n");
- return len;
-}
-
-static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
- cpumask_t *mask = (cpumask_t *)data;
- unsigned long full_count = count, err;
- cpumask_t new_value;
-
- err = cpumask_parse(buffer, count, new_value);
- if (err)
- return err;
-
- *mask = new_value;
- return full_count;
-}
-
-#define MAX_NAMELEN 10
-
-static void register_irq_proc (unsigned int irq)
-{
- char name [MAX_NAMELEN];
-
- if (!root_irq_dir || (irq_descp(irq)->handler == &no_irq_type) || irq_dir[irq])
- return;
-
- memset(name, 0, MAX_NAMELEN);
- sprintf(name, "%d", irq);
-
- /* create /proc/irq/1234 */
- irq_dir[irq] = proc_mkdir(name, root_irq_dir);
-
-#ifdef CONFIG_SMP
- {
- struct proc_dir_entry *entry;
-
- /* create /proc/irq/1234/smp_affinity */
- entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
-
- if (entry) {
- entry->nlink = 1;
- entry->data = (void *)(long)irq;
- entry->read_proc = irq_affinity_read_proc;
- entry->write_proc = irq_affinity_write_proc;
- }
-
- smp_affinity_entry[irq] = entry;
- }
-#endif
-}
-
-cpumask_t prof_cpu_mask = CPU_MASK_ALL;
-
-void init_irq_proc (void)
-{
- struct proc_dir_entry *entry;
- int i;
-
- /* create /proc/irq */
- root_irq_dir = proc_mkdir("irq", 0);
-
- /* create /proc/irq/prof_cpu_mask */
- entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
-
- if (!entry)
- return;
-
- entry->nlink = 1;
- entry->data = (void *)&prof_cpu_mask;
- entry->read_proc = prof_cpu_mask_read_proc;
- entry->write_proc = prof_cpu_mask_write_proc;
-
- /*
- * Create entries for all existing IRQs.
- */
- for (i = 0; i < NR_IRQS; i++) {
- if (irq_descp(i)->handler == &no_irq_type)
- continue;
- register_irq_proc(i);
- }
-}
-#endif
-
-
-#ifdef XEN
/*
* HANDLING OF GUEST-BOUND PHYSICAL IRQS
*/
struct domain *guest[IRQ_MAX_GUESTS];
} irq_guest_action_t;
-/*
-static void __do_IRQ_guest(int irq)
+void __do_IRQ_guest(int irq)
{
irq_desc_t *desc = &irq_desc[irq];
irq_guest_action_t *action = (irq_guest_action_t *)desc->action;
send_guest_pirq(d, irq);
}
}
- */
+
int pirq_guest_unmask(struct domain *d)
{
irq_desc_t *desc;
return 0;
}
-#endif
-
-#ifdef XEN
-#ifdef IA64
// this is a temporary hack until real console input is implemented
extern void domain_pend_keyboard_interrupt(int irq);
irqreturn_t guest_forward_keyboard_input(int irq, void *nada, struct pt_regs *regs)
while(1);
}
}
-#endif
-#endif
projects / xen.git / commitdiff