X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fia64%2Fkernel%2Firq.c;h=4413e54b123b040ebf686437c0a6132c7344f9bd;hb=6a77f38946aaee1cd85eeec6cf4229b204c15071;hp=f779d97a43a785641be54628ebdc3f05755a6697;hpb=87fc8d1bb10cd459024a742c6a10961fefcef18f;p=linux-2.6.git diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c index f779d97a4..4413e54b1 100644 --- a/arch/ia64/kernel/irq.c +++ b/arch/ia64/kernel/irq.c @@ -16,175 +16,47 @@ * architecture. */ -/* - * (mostly architecture independent, will move to kernel/irq.c in 2.5.) - * - * IRQs are in fact implemented a bit like signal handlers for the kernel. - * Naturally it's not a 1:1 relation, but there are similarities. - */ - -#include -#include +#include +#include #include -#include -#include -#include +#include #include -#include -#include -#include -#include -#include -#include -#include #include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - /* - * Linux has a controller-independent x86 interrupt architecture. - * every controller has a 'controller-template', that is used - * by the main code to do the right thing. Each driver-visible - * interrupt source is transparently wired to the appropriate - * controller. Thus drivers need not be aware of the - * interrupt-controller. - * - * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC, - * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC. - * (IO-APICs assumed to be messaging to Pentium local-APICs) - * - * the code is designed to be easily extended with new/different - * interrupt controllers, without having to do assembly magic. - */ - -/* - * Controller mappings for all interrupt sources: - */ -irq_desc_t _irq_desc[NR_IRQS] __cacheline_aligned = { - [0 ... NR_IRQS-1] = { - .status = IRQ_DISABLED, - .handler = &no_irq_type, - .lock = SPIN_LOCK_UNLOCKED - } -}; - -#ifdef CONFIG_SMP -/* - * This is updated when the user sets irq affinity via /proc + * 'what should we do if we get a hw irq event on an illegal vector'. + * each architecture has to answer this themselves. */ -cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS]; -static unsigned long pending_irq_redir[BITS_TO_LONGS(NR_IRQS)]; -#endif - -#ifdef CONFIG_IA64_GENERIC -irq_desc_t * __ia64_irq_desc (unsigned int irq) +void ack_bad_irq(unsigned int irq) { - return _irq_desc + irq; -} - -ia64_vector __ia64_irq_to_vector (unsigned int irq) -{ - return (ia64_vector) irq; + printk(KERN_ERR "Unexpected irq vector 0x%x on CPU %u!\n", irq, smp_processor_id()); } +#ifdef CONFIG_IA64_GENERIC unsigned int __ia64_local_vector_to_irq (ia64_vector vec) { return (unsigned int) vec; } #endif -static void register_irq_proc (unsigned int irq); - -/* - * Special irq handlers. - */ - -irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) -{ return IRQ_NONE; } - /* - * Generic no controller code + * Interrupt statistics: */ -static void enable_none(unsigned int irq) { } -static unsigned int startup_none(unsigned int irq) { return 0; } -static void disable_none(unsigned int irq) { } -static void ack_none(unsigned int irq) -{ -/* - * 'what should we do if we get a hw irq event on an illegal vector'. - * 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" */ -#define shutdown_none disable_none -#define end_none enable_none - -struct hw_interrupt_type no_irq_type = { - "none", - startup_none, - shutdown_none, - enable_none, - disable_none, - ack_none, - end_none -}; - 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: + * /proc/interrupts printing: */ int show_interrupts(struct seq_file *p, void *v) { - int j, i = *(loff_t *) v; + int i = *(loff_t *) v, j; struct irqaction * action; - irq_desc_t *idesc; unsigned long flags; if (i == 0) { - seq_puts(p, " "); + seq_printf(p, " "); for (j=0; jlock, flags); - action = idesc->action; + spin_lock_irqsave(&irq_desc[i].lock, flags); + action = irq_desc[i].action; if (!action) goto skip; seq_printf(p, "%3d: ",i); @@ -205,7 +76,7 @@ int show_interrupts(struct seq_file *p, void *v) if (cpu_online(j)) seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); #endif - seq_printf(p, " %14s", idesc->handler->typename); + seq_printf(p, " %14s", irq_desc[i].handler->typename); seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) @@ -213,733 +84,20 @@ int show_interrupts(struct seq_file *p, void *v) 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 + spin_unlock_irqrestore(&irq_desc[i].lock, flags); + } else if (i == NR_IRQS) 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; } #ifdef CONFIG_SMP -inline void synchronize_irq(unsigned int irq) -{ - while (irq_descp(irq)->status & IRQ_INPROGRESS) - cpu_relax(); -} -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) -{ - int status = 1; /* Force the "do bottom halves" bit */ - int ret, retval = 0; - - if (!(action->flags & SA_INTERRUPT)) - local_irq_enable(); - - do { - ret = action->handler(irq, action->dev_id, regs); - if (ret == IRQ_HANDLED) - status |= action->flags; - retval |= ret; - action = action->next; - } while (action); - if (status & SA_SAMPLE_RANDOM) - add_interrupt_randomness(irq); - local_irq_disable(); - return retval; -} - -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); - } -} - -static int noirqdebug; - -static int __init noirqdebug_setup(char *str) -{ - noirqdebug = 1; - printk("IRQ lockup detection disabled\n"); - return 1; -} - -__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 - */ -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; -} - -/* - * Generic enable/disable code: this just calls - * down into the PIC-specific version for the actual - * hardware disable after having gotten the irq - * 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; - if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { - desc->status = status | IRQ_REPLAY; - hw_resend_irq(desc->handler,irq); - } - 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 - * handlers). - */ -unsigned int do_IRQ(unsigned long irq, struct pt_regs *regs) -{ - /* - * We ack quickly, we don't want the irq controller - * thinking we're snobs just because some other CPU has - * disabled global interrupts (we have already done the - * INT_ACK cycles, it's too late to try to pretend to the - * controller that we aren't taking the interrupt). - * - * 0 return value means that this irq is already being - * handled by some other CPU. (or is disabled) - */ - irq_desc_t *desc = irq_descp(irq); - struct irqaction * action; - irqreturn_t action_ret; - unsigned int status; - int cpu; - - cpu = smp_processor_id(); /* for CONFIG_PREEMPT, this must come after irq_enter()! */ - - kstat_cpu(cpu).irqs[irq]++; - - if (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); - desc->handler->end(irq); - } else { - spin_lock(&desc->lock); - 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 - */ - status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING); - status |= IRQ_PENDING; /* we _want_ to handle it */ - - /* - * If the IRQ is disabled for whatever reason, we cannot - * use the action we have. - */ - action = NULL; - if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) { - action = desc->action; - status &= ~IRQ_PENDING; /* we commit to handling */ - status |= IRQ_INPROGRESS; /* we are handling it */ - } - desc->status = status; - - /* - * If there is no IRQ handler or it was disabled, exit early. - * Since we set PENDING, if another processor is handling - * a different instance of this same irq, the other processor - * will take care of it. - */ - if (unlikely(!action)) - goto out; - - /* - * Edge triggered interrupts need to remember - * pending events. - * This applies to any hw interrupts that allow a second - * instance of the same irq to arrive while we are in do_IRQ - * or in the handler. But the code here only handles the _second_ - * instance of the irq, not the third or fourth. So it is mostly - * useful for irq hardware that does not mask cleanly in an - * SMP environment. - */ - for (;;) { - spin_unlock(&desc->lock); - action_ret = handle_IRQ_event(irq, regs, action); - spin_lock(&desc->lock); - if (!noirqdebug) - note_interrupt(irq, desc, action_ret); - if (!(desc->status & IRQ_PENDING)) - break; - desc->status &= ~IRQ_PENDING; - } - desc->status &= ~IRQ_INPROGRESS; - out: - /* - * The ->end() handler has to deal with interrupts which got - * disabled while the handler was running. - */ - desc->handler->end(irq); - spin_unlock(&desc->lock); - } - return 1; -} - -/** - * request_irq - allocate an interrupt line - * @irq: Interrupt line to allocate - * @handler: Function to be called when the IRQ occurs - * @irqflags: Interrupt type flags - * @devname: An ascii name for the claiming device - * @dev_id: A cookie passed back to the handler function - * - * This call allocates interrupt resources and enables the - * interrupt line and IRQ handling. From the point this - * call is made your handler function may be invoked. Since - * your handler function must clear any interrupt the board - * raises, you must take care both to initialise your hardware - * and to set up the interrupt handler in the right order. - * - * Dev_id must be globally unique. Normally the address of the - * device data structure is used as the cookie. Since the handler - * receives this value it makes sense to use it. - * - * If your interrupt is shared you must pass a non NULL dev_id - * as this is required when freeing the interrupt. - * - * Flags: - * - * SA_SHIRQ Interrupt is shared - * - * SA_INTERRUPT Disable local interrupts while processing - * - * SA_SAMPLE_RANDOM The interrupt can be used for entropy - * - */ - -int request_irq(unsigned int irq, - irqreturn_t (*handler)(int, void *, struct pt_regs *), - unsigned long irqflags, - const char * devname, - void *dev_id) -{ - 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 - * to figure out which interrupt is which (messes up the - * interrupt freeing logic etc). - */ - if (irqflags & SA_SHIRQ) { - 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 (!handler) - return -EINVAL; - - action = (struct irqaction *) - kmalloc(sizeof(struct irqaction), GFP_ATOMIC); - if (!action) - return -ENOMEM; - - action->handler = handler; - action->flags = irqflags; - cpus_clear(action->mask); - action->name = devname; - action->next = NULL; - action->dev_id = dev_id; - - retval = setup_irq(irq, action); - if (retval) - kfree(action); - return retval; -} - -EXPORT_SYMBOL(request_irq); - -/** - * free_irq - free an interrupt - * @irq: Interrupt line to free - * @dev_id: Device identity to free - * - * Remove an interrupt handler. The handler is removed and if the - * interrupt line is no longer in use by any driver it is disabled. - * On a shared IRQ the caller must ensure the interrupt is disabled - * on the card it drives before calling this function. The function - * does not return until any executing interrupts for this IRQ - * have completed. - * - * This function must not be called from interrupt context. - */ - -void free_irq(unsigned int irq, void *dev_id) -{ - irq_desc_t *desc; - struct irqaction **p; - unsigned long flags; - - if (irq >= NR_IRQS) - return; - - desc = irq_descp(irq); - spin_lock_irqsave(&desc->lock,flags); - 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) { - desc->status |= IRQ_DISABLED; - desc->handler->shutdown(irq); - } - spin_unlock_irqrestore(&desc->lock,flags); - - /* Wait to make sure it's not being used on another CPU */ - synchronize_irq(irq); - kfree(action); - return; - } - printk(KERN_ERR "Trying to free free IRQ%d\n",irq); - spin_unlock_irqrestore(&desc->lock,flags); - return; - } -} - -EXPORT_SYMBOL(free_irq); - /* - * IRQ autodetection code.. - * - * This depends on the fact that any interrupt that - * comes in on to an unassigned handler will get stuck - * with "IRQ_WAITING" cleared and the interrupt - * disabled. - */ - -static 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. + * This is updated when the user sets irq affinity via /proc */ - -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); - -int setup_irq(unsigned int irq, struct irqaction * new) -{ - int shared = 0; - unsigned long flags; - struct irqaction *old, **p; - irq_desc_t *desc = irq_descp(irq); - - 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; - } - - /* - * The following block of code has to be executed atomically - */ - spin_lock_irqsave(&desc->lock,flags); - p = &desc->action; - if ((old = *p) != NULL) { - /* Can't share interrupts unless both agree to */ - if (!(old->flags & new->flags & SA_SHIRQ)) { - spin_unlock_irqrestore(&desc->lock,flags); - return -EBUSY; - } - - /* add new interrupt at end of irq queue */ - do { - p = &old->next; - old = *p; - } while (old); - shared = 1; - } - - *p = new; - - if (!shared) { - desc->depth = 0; - desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS); - desc->handler->startup(irq); - } - spin_unlock_irqrestore(&desc->lock,flags); - - register_irq_proc(irq); - return 0; -} - -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]; +cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS]; +static unsigned long pending_irq_redir[BITS_TO_LONGS(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) @@ -954,79 +112,6 @@ void set_irq_affinity_info (unsigned int irq, int hwid, int redir) } } -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 __user *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; - int redir = 0; - - 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 "); - redir++; - } - - 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; - if (redir) - set_bit(irq, pending_irq_redir); - else - clear_bit(irq, pending_irq_redir); - spin_unlock_irqrestore(&desc->lock, flags); - - return full_count; -} void move_irq(int irq) { @@ -1035,6 +120,9 @@ void move_irq(int irq) irq_desc_t *desc = irq_descp(irq); int redir = test_bit(irq, pending_irq_redir); + if (unlikely(!desc->handler->set_affinity)) + return; + if (!cpus_empty(pending_irq_cpumask[irq])) { cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map); if (unlikely(!cpus_empty(tmp))) { @@ -1126,7 +214,7 @@ void fixup_irqs(void) for (irq=0; irq < NR_IRQS; irq++) { if (vectors_in_migration[irq]) { vectors_in_migration[irq]=0; - do_IRQ(irq, NULL); + __do_IRQ(irq, NULL); } } @@ -1140,57 +228,3 @@ void fixup_irqs(void) local_irq_disable(); } #endif - -#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 -} - -void init_irq_proc (void) -{ - int i; - - /* create /proc/irq */ - root_irq_dir = proc_mkdir("irq", NULL); - - /* create /proc/irq/prof_cpu_mask */ - create_prof_cpu_mask(root_irq_dir); - - /* - * 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); - } -}