iCE40/yosys - clone of https://github.com/YosysHQ/yosys

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Diffstat (limited to 'backends/smt2/smtio.py')

0 files changed, 0 insertions, 0 deletions

/* * linux/arch/ia64/kernel/irq.c * * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar * * This file contains the code used by various IRQ handling routines: * asking for different IRQ's should be done through these routines * instead of just grabbing them. Thus setups with different IRQ numbers * shouldn't result in any weird surprises, and installing new handlers * should be easier. * * Copyright (C) Ashok Raj<ashok.raj@intel.com>, Intel Corporation 2004 * * 4/14/2004: Added code to handle cpu migration and do safe irq * migration without lossing interrupts for iosapic * 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 <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. * 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 } }; /* * 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 */ 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: */ #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 } 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) { 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 */ #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 * 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; #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 * handlers). */ fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs) { irq_desc_t *desc = irq_desc + irq; struct irqaction * action; unsigned int status; #ifndef XEN kstat_this_cpu.irqs[irq]++; #endif if (desc->status & IRQ_PER_CPU) { irqreturn_t action_ret; /* * 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 desc->handler->end(irq); return 1; } 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 */ #ifdef XEN status = desc->status & ~IRQ_REPLAY; #else status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING); #endif 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 (;;) { irqreturn_t action_ret; spin_unlock(&desc->lock); action_ret = handle_IRQ_event(irq, regs, action); 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; 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 = xmalloc(struct irqaction); 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); if (retval) xfree(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. */ #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) return; 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 */ synchronize_irq(irq); xfree(action); return; } 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); /* * 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. */ #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 } *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); } 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 */ #define IRQ_MAX_GUESTS 7 typedef struct { u8 nr_guests; u8 in_flight; u8 shareable; struct domain *guest[IRQ_MAX_GUESTS]; } irq_guest_action_t; /* static void __do_IRQ_guest(int irq) { irq_desc_t *desc = &irq_desc[irq]; irq_guest_action_t *action = (irq_guest_action_t *)desc->action; struct domain *d; int i; for ( i = 0; i < action->nr_guests; i++ ) { d = action->guest[i]; if ( !test_and_set_bit(irq, &d->pirq_mask) ) action->in_flight++; send_guest_pirq(d, irq); } } */ int pirq_guest_unmask(struct domain *d) { irq_desc_t *desc; int i, j, pirq; u32 m; shared_info_t *s = d->shared_info; for ( i = 0; i < ARRAY_SIZE(d->pirq_mask); i++ ) { m = d->pirq_mask[i]; while ( (j = ffs(m)) != 0 ) { m &= ~(1 << --j); pirq = (i << 5) + j; desc = &irq_desc[pirq]; spin_lock_irq(&desc->lock); if ( !test_bit(d->pirq_to_evtchn[pirq], &s->evtchn_mask[0]) && test_and_clear_bit(pirq, &d->pirq_mask) && (--((irq_guest_action_t *)desc->action)->in_flight == 0) ) desc->handler->end(pirq); spin_unlock_irq(&desc->lock); } } return 0; } int pirq_guest_bind(struct vcpu *v, int irq, int will_share) { irq_desc_t *desc = &irq_desc[irq]; irq_guest_action_t *action; unsigned long flags; int rc = 0; spin_lock_irqsave(&desc->lock, flags); action = (irq_guest_action_t *)desc->action; if ( !(desc->status & IRQ_GUEST) ) { if ( desc->action != NULL ) { DPRINTK("Cannot bind IRQ %d to guest. In use by '%s'.\n", irq, desc->action->name); rc = -EBUSY; goto out; } action = xmalloc(irq_guest_action_t); if ( (desc->action = (struct irqaction *)action) == NULL ) { DPRINTK("Cannot bind IRQ %d to guest. Out of memory.\n", irq); rc = -ENOMEM; goto out; } action->nr_guests = 0; action->in_flight = 0; action->shareable = will_share; desc->depth = 0; desc->status |= IRQ_GUEST; desc->status &= ~IRQ_DISABLED; desc->handler->startup(irq); /* Attempt to bind the interrupt target to the correct CPU. */ #if 0 /* FIXME CONFIG_SMP ??? */ if ( desc->handler->set_affinity != NULL ) desc->handler->set_affinity( irq, apicid_to_phys_cpu_present(d->processor)); #endif } else if ( !will_share || !action->shareable ) { DPRINTK("Cannot bind IRQ %d to guest. Will not share with others.\n", irq); rc = -EBUSY; goto out; } if ( action->nr_guests == IRQ_MAX_GUESTS ) { DPRINTK("Cannot bind IRQ %d to guest. Already at max share.\n", irq); rc = -EBUSY; goto out; } action->guest[action->nr_guests++] = v->domain; out: spin_unlock_irqrestore(&desc->lock, flags); return rc; } int pirq_guest_unbind(struct domain *d, int irq) { irq_desc_t *desc = &irq_desc[irq]; irq_guest_action_t *action; unsigned long flags; int i; spin_lock_irqsave(&desc->lock, flags); action = (irq_guest_action_t *)desc->action; if ( test_and_clear_bit(irq, &d->pirq_mask) && (--action->in_flight == 0) ) desc->handler->end(irq); if ( action->nr_guests == 1 ) { desc->action = NULL; xfree(action); desc->depth = 1; desc->status |= IRQ_DISABLED; desc->status &= ~IRQ_GUEST; desc->handler->shutdown(irq); } else { i = 0; while ( action->guest[i] != d ) i++; memmove(&action->guest[i], &action->guest[i+1], IRQ_MAX_GUESTS-i-1); action->nr_guests--; } spin_unlock_irqrestore(&desc->lock, flags); 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) { domain_pend_keyboard_interrupt(irq); return 0; } void serial_input_init(void) { int retval; int irq = 0x30; // FIXME retval = request_irq(irq,guest_forward_keyboard_input,SA_INTERRUPT,"siminput",NULL); if (retval) { printk("serial_input_init: broken request_irq call\n"); while(1); } } #endif #endif


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