X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fum%2Fkernel%2Firq.c;h=1e766cee627e818ab1b00eaf1a42b89fd25e099a;hb=67da514125f23d27bd45d41e330ef14b6206fe69;hp=0e968bb11a45ca31d92f3ebbfc1ef70b8ba3e962;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c index 0e968bb11..1e766cee6 100644 --- a/arch/um/kernel/irq.c +++ b/arch/um/kernel/irq.c @@ -5,11 +5,9 @@ * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar */ -#include "linux/config.h" #include "linux/kernel.h" #include "linux/module.h" #include "linux/smp.h" -#include "linux/irq.h" #include "linux/kernel_stat.h" #include "linux/interrupt.h" #include "linux/random.h" @@ -18,9 +16,10 @@ #include "linux/proc_fs.h" #include "linux/init.h" #include "linux/seq_file.h" +#include "linux/profile.h" +#include "linux/hardirq.h" #include "asm/irq.h" #include "asm/hw_irq.h" -#include "asm/hardirq.h" #include "asm/atomic.h" #include "asm/signal.h" #include "asm/system.h" @@ -29,764 +28,395 @@ #include "user_util.h" #include "kern_util.h" #include "irq_user.h" - -static void register_irq_proc (unsigned int irq); - -irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = { - [0 ... NR_IRQS-1] = { - .handler = &no_irq_type, - .lock = SPIN_LOCK_UNLOCKED - } -}; - -/* - * 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 -} - -/* 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 -}; - -/* Not changed */ -volatile unsigned long irq_err_count; +#include "irq_kern.h" +#include "os.h" +#include "sigio.h" +#include "misc_constants.h" /* * Generic, controller-independent functions: */ -int get_irq_list(char *buf) +int show_interrupts(struct seq_file *p, void *v) { - int i, j; - unsigned long flags; + int i = *(loff_t *) v, j; struct irqaction * action; - char *p = buf; + unsigned long flags; - p += sprintf(p, " "); - for (j=0; jtypename); - p += sprintf(p, " %s", action->name); + seq_printf(p, " %14s", irq_desc[i].chip->typename); + seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) - p += sprintf(p, ", %s", action->name); - *p++ = '\n'; - end: + seq_printf(p, ", %s", action->name); + + seq_putc(p, '\n'); +skip: spin_unlock_irqrestore(&irq_desc[i].lock, flags); + } else if (i == NR_IRQS) { + seq_putc(p, '\n'); } - p += sprintf(p, "\n"); -#ifdef notdef -#ifdef CONFIG_SMP - p += sprintf(p, "LOC: "); - for (j = 0; j < num_online_cpus(); j++) - p += sprintf(p, "%10u ", - apic_timer_irqs[cpu_logical_map(j)]); - p += sprintf(p, "\n"); -#endif -#endif - p += sprintf(p, "ERR: %10lu\n", irq_err_count); - return p - buf; -} - -int show_interrupts(struct seq_file *p, void *v) -{ - return(0); + return 0; } -/* - * 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 */ - - if (!(action->flags & SA_INTERRUPT)) - local_irq_enable(); +struct irq_fd *active_fds = NULL; +static struct irq_fd **last_irq_ptr = &active_fds; - do { - status |= action->flags; - action->handler(irq, action->dev_id, regs); - action = action->next; - } while (action); - if (status & SA_SAMPLE_RANDOM) - add_interrupt_randomness(irq); +extern void free_irqs(void); - local_irq_disable(); +void sigio_handler(int sig, union uml_pt_regs *regs) +{ + struct irq_fd *irq_fd; + int n; - return status; -} + if (smp_sigio_handler()) + return; -/* - * 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 of an interrupt - * stack. 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_desc + irq; - unsigned long flags; + while (1) { + n = os_waiting_for_events(active_fds); + if (n <= 0) { + if(n == -EINTR) continue; + else break; + } - spin_lock_irqsave(&desc->lock, flags); - if (!desc->depth++) { - desc->status |= IRQ_DISABLED; - desc->handler->disable(irq); + for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) { + if (irq_fd->current_events != 0) { + irq_fd->current_events = 0; + do_IRQ(irq_fd->irq, regs); + } + } } - spin_unlock_irqrestore(&desc->lock, flags); -} -#ifdef CONFIG_SMP -inline void synchronize_irq(unsigned int irq) -{ - /* is there anything to synchronize with? */ - if (!irq_desc[irq].action) - return; - - while (irq_desc[irq].status & IRQ_INPROGRESS) - cpu_relax(); + free_irqs(); } -#endif -/** - * disable_irq - disable an irq and wait for completion - * @irq: Interrupt to disable - * - * Disable the selected interrupt line. Disables of an interrupt - * stack. That is for two disables you need two enables. 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) -{ - disable_irq_nosync(irq); - synchronize_irq(irq); -} +static DEFINE_SPINLOCK(irq_lock); -/** - * enable_irq - enable interrupt handling on an irq - * @irq: Interrupt to enable - * - * Re-enables the processing of interrupts on this IRQ line - * providing no disable_irq calls are now in effect. - * - * This function may be called from IRQ context. - */ - -void enable_irq(unsigned int irq) +int activate_fd(int irq, int fd, int type, void *dev_id) { - irq_desc_t *desc = irq_desc + irq; + struct pollfd *tmp_pfd; + struct irq_fd *new_fd, *irq_fd; unsigned long flags; + int pid, events, err, n; - 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() unbalanced from %p\n", - __builtin_return_address(0)); - } - spin_unlock_irqrestore(&desc->lock, flags); -} - -/* - * do_IRQ handles all normal device IRQ's (the special - * SMP cross-CPU interrupts have their own specific - * handlers). - */ -unsigned int do_IRQ(int irq, union uml_pt_regs *regs) -{ - /* - * 0 return value means that this irq is already being - * handled by some other CPU. (or is disabled) - */ - int cpu = smp_processor_id(); - irq_desc_t *desc = irq_desc + irq; - struct irqaction * action; - unsigned int status; - - irq_enter(); - kstat_cpu(cpu).irqs[irq]++; - 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 (!(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; + pid = os_getpid(); + err = os_set_fd_async(fd, pid); + if (err < 0) + goto out; - /* - * 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 (!action) + new_fd = um_kmalloc(sizeof(*new_fd)); + err = -ENOMEM; + if (new_fd == NULL) 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. + if (type == IRQ_READ) + events = UM_POLLIN | UM_POLLPRI; + else + events = UM_POLLOUT; + *new_fd = ((struct irq_fd) { .next = NULL, + .id = dev_id, + .fd = fd, + .type = type, + .irq = irq, + .pid = pid, + .events = events, + .current_events = 0 } ); + + /* Critical section - locked by a spinlock because this stuff can + * be changed from interrupt handlers. The stuff above is done + * outside the lock because it allocates memory. */ - for (;;) { - spin_unlock(&desc->lock); - handle_IRQ_event(irq, (struct pt_regs *) regs, action); - spin_lock(&desc->lock); - - 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); - - irq_exit(); - 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, - void (*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). + /* Actually, it only looks like it can be called from interrupt + * context. The culprit is reactivate_fd, which calls + * maybe_sigio_broken, which calls write_sigio_workaround, + * which calls activate_fd. However, write_sigio_workaround should + * only be called once, at boot time. That would make it clear that + * this is called only from process context, and can be locked with + * a semaphore. */ - if (irqflags & SA_SHIRQ) { - if (!dev_id) - printk(KERN_ERR "Bad boy: %s (at 0x%x) called us " - "without a dev_id!\n", devname, (&irq)[-1]); + spin_lock_irqsave(&irq_lock, flags); + for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) { + if ((irq_fd->fd == fd) && (irq_fd->type == type)) { + printk("Registering fd %d twice\n", fd); + printk("Irqs : %d, %d\n", irq_fd->irq, irq); + printk("Ids : 0x%p, 0x%p\n", irq_fd->id, dev_id); + goto out_unlock; + } } -#endif - if (irq >= NR_IRQS) - return -EINVAL; - if (!handler) - return -EINVAL; - - action = (struct irqaction *) - kmalloc(sizeof(struct irqaction), GFP_KERNEL); - 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; -} + /*-------------*/ + if (type == IRQ_WRITE) + fd = -1; -EXPORT_SYMBOL(request_irq); + tmp_pfd = NULL; + n = 0; -int um_request_irq(unsigned int irq, int fd, int type, - void (*handler)(int, void *, struct pt_regs *), - unsigned long irqflags, const char * devname, - void *dev_id) -{ - int retval; + while (1) { + n = os_create_pollfd(fd, events, tmp_pfd, n); + if (n == 0) + break; - retval = request_irq(irq, handler, irqflags, devname, dev_id); - if(retval) return(retval); - return(activate_fd(irq, fd, type, dev_id)); -} + /* n > 0 + * It means we couldn't put new pollfd to current pollfds + * and tmp_fds is NULL or too small for new pollfds array. + * Needed size is equal to n as minimum. + * + * Here we have to drop the lock in order to call + * kmalloc, which might sleep. + * If something else came in and changed the pollfds array + * so we will not be able to put new pollfd struct to pollfds + * then we free the buffer tmp_fds and try again. + */ + spin_unlock_irqrestore(&irq_lock, flags); + kfree(tmp_pfd); + tmp_pfd = NULL; -/* this was setup_x86_irq but it seems pretty generic */ -int setup_irq(unsigned int irq, struct irqaction * new) -{ - int shared = 0; - unsigned long flags; - struct irqaction *old, **p; - irq_desc_t *desc = irq_desc + irq; + tmp_pfd = um_kmalloc(n); + if (tmp_pfd == NULL) + goto out_kfree; - /* - * 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); + spin_lock_irqsave(&irq_lock, flags); } + /*-------------*/ - /* - * 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; - } + *last_irq_ptr = new_fd; + last_irq_ptr = &new_fd->next; - /* add new interrupt at end of irq queue */ - do { - p = &old->next; - old = *p; - } while (old); - shared = 1; - } + spin_unlock_irqrestore(&irq_lock, flags); - *p = new; + /* This calls activate_fd, so it has to be outside the critical + * section. + */ + maybe_sigio_broken(fd, (type == IRQ_READ)); - if (!shared) { - desc->depth = 0; - desc->status &= ~IRQ_DISABLED; - desc->handler->startup(irq); - } - spin_unlock_irqrestore(&desc->lock,flags); + return(0); - register_irq_proc(irq); - return 0; + out_unlock: + spin_unlock_irqrestore(&irq_lock, flags); + out_kfree: + kfree(new_fd); + out: + return(err); } -/** - * 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 may be called from interrupt context. - * - * Bugs: Attempting to free an irq in a handler for the same irq hangs - * the machine. - */ - -void free_irq(unsigned int irq, void *dev_id) +static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg) { - irq_desc_t *desc; - struct irqaction **p; unsigned long flags; - if (irq >= NR_IRQS) - return; - - desc = irq_desc + 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); - } - free_irq_by_irq_and_dev(irq, dev_id); - 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; - } + spin_lock_irqsave(&irq_lock, flags); + os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr); + spin_unlock_irqrestore(&irq_lock, flags); } -EXPORT_SYMBOL(free_irq); - -/* These are initialized by sysctl_init, which is called from init/main.c */ -static struct proc_dir_entry * root_irq_dir; -static struct proc_dir_entry * irq_dir [NR_IRQS]; -static struct proc_dir_entry * smp_affinity_entry [NR_IRQS]; - -/* These are read and written as longs, so a read won't see a partial write - * even during a race. - */ -static cpumask_t irq_affinity [NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL }; +struct irq_and_dev { + int irq; + void *dev; +}; -static int irq_affinity_read_proc (char *page, char **start, off_t off, - int count, int *eof, void *data) +static int same_irq_and_dev(struct irq_fd *irq, void *d) { - int len = cpumask_scnprintf(page, count, irq_affinity[(long)data]); - if (count - len < 2) - return -EINVAL; - len += sprintf(page + len, "\n"); - return len; + struct irq_and_dev *data = d; + + return ((irq->irq == data->irq) && (irq->id == data->dev)); } -static int irq_affinity_write_proc (struct file *file, const char *buffer, - unsigned long count, void *data) +void free_irq_by_irq_and_dev(unsigned int irq, void *dev) { - int irq = (long) data, full_count = count, err; - cpumask_t new_value, tmp; - - if (!irq_desc[irq].handler->set_affinity) - return -EIO; + struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq, + .dev = dev }); - err = cpumask_parse(buffer, count, new_value); - -#ifdef CONFIG_SMP - /* - * 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; -#endif - - irq_affinity[irq] = new_value; - irq_desc[irq].handler->set_affinity(irq, new_value); - - return full_count; + free_irq_by_cb(same_irq_and_dev, &data); } -static int prof_cpu_mask_read_proc (char *page, char **start, off_t off, - int count, int *eof, void *data) +static int same_fd(struct irq_fd *irq, void *fd) { - int len = cpumask_scnprintf(page, count, *(cpumask_t *)data); - if (count - len < 2) - return -EINVAL; - len += sprintf(page + len, "\n"); - return len; + return (irq->fd == *((int *)fd)); } -static int prof_cpu_mask_write_proc (struct file *file, const char *buffer, - unsigned long count, void *data) +void free_irq_by_fd(int fd) { - cpumask_t *mask = (cpumask_t *)data, new_value; - unsigned long full_count = count, err; - - err = cpumask_parse(buffer, count, new_value); - if (err) - return err; - - *mask = new_value; - return full_count; + free_irq_by_cb(same_fd, &fd); } -#define MAX_NAMELEN 10 - -static void register_irq_proc (unsigned int irq) +static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out) { - struct proc_dir_entry *entry; - char name [MAX_NAMELEN]; - - if (!root_irq_dir || (irq_desc[irq].handler == &no_irq_type) || - irq_dir[irq]) - return; - - memset(name, 0, MAX_NAMELEN); - sprintf(name, "%d", irq); + struct irq_fd *irq; + int i = 0; + int fdi; - /* create /proc/irq/1234 */ - irq_dir[irq] = proc_mkdir(name, root_irq_dir); - - /* create /proc/irq/1234/smp_affinity */ - entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]); - - 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; + for (irq = active_fds; irq != NULL; irq = irq->next) { + if ((irq->fd == fd) && (irq->irq == irqnum)) + break; + i++; + } + if (irq == NULL) { + printk("find_irq_by_fd doesn't have descriptor %d\n", fd); + goto out; + } + fdi = os_get_pollfd(i); + if ((fdi != -1) && (fdi != fd)) { + printk("find_irq_by_fd - mismatch between active_fds and " + "pollfds, fd %d vs %d, need %d\n", irq->fd, + fdi, fd); + irq = NULL; + goto out; + } + *index_out = i; + out: + return irq; } -/* Read and written as a long */ -cpumask_t prof_cpu_mask = CPU_MASK_ALL; - -void __init init_irq_proc (void) +void reactivate_fd(int fd, int irqnum) { - struct proc_dir_entry *entry; + struct irq_fd *irq; + unsigned long flags; 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); - - 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; + spin_lock_irqsave(&irq_lock, flags); + irq = find_irq_by_fd(fd, irqnum, &i); + if (irq == NULL) { + spin_unlock_irqrestore(&irq_lock, flags); + return; + } + os_set_pollfd(i, irq->fd); + spin_unlock_irqrestore(&irq_lock, flags); - /* - * Create entries for all existing IRQs. + /* This calls activate_fd, so it has to be outside the critical + * section. */ - for (i = 0; i < NR_IRQS; i++) - register_irq_proc(i); + maybe_sigio_broken(fd, (irq->type == IRQ_READ)); } -static spinlock_t irq_spinlock = SPIN_LOCK_UNLOCKED; - -unsigned long irq_lock(void) +void deactivate_fd(int fd, int irqnum) { + struct irq_fd *irq; unsigned long flags; + int i; - spin_lock_irqsave(&irq_spinlock, flags); - return(flags); -} - -void irq_unlock(unsigned long flags) -{ - spin_unlock_irqrestore(&irq_spinlock, flags); -} - -unsigned long probe_irq_on(void) -{ - return(0); -} - -EXPORT_SYMBOL(probe_irq_on); - -int probe_irq_off(unsigned long val) -{ - return(0); -} - -EXPORT_SYMBOL(probe_irq_off); - -static unsigned int startup_SIGIO_irq(unsigned int irq) -{ - return(0); -} - -static void shutdown_SIGIO_irq(unsigned int irq) -{ + spin_lock_irqsave(&irq_lock, flags); + irq = find_irq_by_fd(fd, irqnum, &i); + if (irq == NULL) + goto out; + os_set_pollfd(i, -1); + out: + spin_unlock_irqrestore(&irq_lock, flags); } -static void enable_SIGIO_irq(unsigned int irq) +int deactivate_all_fds(void) { -} + struct irq_fd *irq; + int err; -static void disable_SIGIO_irq(unsigned int irq) -{ -} + for (irq = active_fds; irq != NULL; irq = irq->next) { + err = os_clear_fd_async(irq->fd); + if (err) + return err; + } + /* If there is a signal already queued, after unblocking ignore it */ + os_set_ioignore(); -static void mask_and_ack_SIGIO(unsigned int irq) -{ + return 0; } -static void end_SIGIO_irq(unsigned int irq) +#ifdef CONFIG_MODE_TT +void forward_interrupts(int pid) { -} + struct irq_fd *irq; + unsigned long flags; + int err; + + spin_lock_irqsave(&irq_lock, flags); + for (irq = active_fds; irq != NULL; irq = irq->next) { + err = os_set_owner(irq->fd, pid); + if (err < 0) { + /* XXX Just remove the irq rather than + * print out an infinite stream of these + */ + printk("Failed to forward %d to pid %d, err = %d\n", + irq->fd, pid, -err); + } -static unsigned int startup_SIGVTALRM_irq(unsigned int irq) -{ - return(0); + irq->pid = pid; + } + spin_unlock_irqrestore(&irq_lock, flags); } +#endif -static void shutdown_SIGVTALRM_irq(unsigned int irq) +/* + * do_IRQ handles all normal device IRQ's (the special + * SMP cross-CPU interrupts have their own specific + * handlers). + */ +unsigned int do_IRQ(int irq, union uml_pt_regs *regs) { + irq_enter(); + __do_IRQ(irq, (struct pt_regs *)regs); + irq_exit(); + return 1; } -static void enable_SIGVTALRM_irq(unsigned int irq) +int um_request_irq(unsigned int irq, int fd, int type, + irqreturn_t (*handler)(int, void *, struct pt_regs *), + unsigned long irqflags, const char * devname, + void *dev_id) { -} + int err; -static void disable_SIGVTALRM_irq(unsigned int irq) -{ -} + err = request_irq(irq, handler, irqflags, devname, dev_id); + if (err) + return err; -static void mask_and_ack_SIGVTALRM(unsigned int irq) -{ + if (fd != -1) + err = activate_fd(irq, fd, type, dev_id); + return err; } +EXPORT_SYMBOL(um_request_irq); +EXPORT_SYMBOL(reactivate_fd); -static void end_SIGVTALRM_irq(unsigned int irq) +/* hw_interrupt_type must define (startup || enable) && + * (shutdown || disable) && end */ +static void dummy(unsigned int irq) { } -static struct hw_interrupt_type SIGIO_irq_type = { - "SIGIO", - startup_SIGIO_irq, - shutdown_SIGIO_irq, - enable_SIGIO_irq, - disable_SIGIO_irq, - mask_and_ack_SIGIO, - end_SIGIO_irq, - NULL +/* This is used for everything else than the timer. */ +static struct hw_interrupt_type normal_irq_type = { + .typename = "SIGIO", + .release = free_irq_by_irq_and_dev, + .disable = dummy, + .enable = dummy, + .ack = dummy, + .end = dummy }; static struct hw_interrupt_type SIGVTALRM_irq_type = { - "SIGVTALRM", - startup_SIGVTALRM_irq, - shutdown_SIGVTALRM_irq, - enable_SIGVTALRM_irq, - disable_SIGVTALRM_irq, - mask_and_ack_SIGVTALRM, - end_SIGVTALRM_irq, - NULL + .typename = "SIGVTALRM", + .release = free_irq_by_irq_and_dev, + .shutdown = dummy, /* never called */ + .disable = dummy, + .enable = dummy, + .ack = dummy, + .end = dummy }; void __init init_IRQ(void) @@ -794,27 +424,45 @@ void __init init_IRQ(void) int i; irq_desc[TIMER_IRQ].status = IRQ_DISABLED; - irq_desc[TIMER_IRQ].action = 0; + irq_desc[TIMER_IRQ].action = NULL; irq_desc[TIMER_IRQ].depth = 1; - irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type; + irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type; enable_irq(TIMER_IRQ); - for(i=1;i