* 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 "irq_user.h"
#include "irq_kern.h"
#include "os.h"
-#include "sigio.h"
-#include "misc_constants.h"
/*
* Generic, controller-independent functions:
for_each_online_cpu(j)
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
- seq_printf(p, " %14s", irq_desc[i].chip->typename);
+ seq_printf(p, " %14s", irq_desc[i].handler->typename);
seq_printf(p, " %s", action->name);
for (action=action->next; action; action = action->next)
return 0;
}
-struct irq_fd *active_fds = NULL;
-static struct irq_fd **last_irq_ptr = &active_fds;
-
-extern void free_irqs(void);
-
-void sigio_handler(int sig, union uml_pt_regs *regs)
-{
- struct irq_fd *irq_fd;
- int n;
-
- if (smp_sigio_handler())
- return;
-
- while (1) {
- n = os_waiting_for_events(active_fds);
- if (n <= 0) {
- if(n == -EINTR) continue;
- else break;
- }
-
- 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);
- }
- }
- }
-
- free_irqs();
-}
-
-static DEFINE_SPINLOCK(irq_lock);
-
-int activate_fd(int irq, int fd, int type, void *dev_id)
-{
- struct pollfd *tmp_pfd;
- struct irq_fd *new_fd, *irq_fd;
- unsigned long flags;
- int pid, events, err, n;
-
- pid = os_getpid();
- err = os_set_fd_async(fd, pid);
- if (err < 0)
- goto out;
-
- new_fd = um_kmalloc(sizeof(*new_fd));
- err = -ENOMEM;
- if (new_fd == NULL)
- goto out;
-
- 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.
- */
-
- /* 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.
- */
- 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;
- }
- }
-
- /*-------------*/
- if (type == IRQ_WRITE)
- fd = -1;
-
- tmp_pfd = NULL;
- n = 0;
-
- while (1) {
- n = os_create_pollfd(fd, events, tmp_pfd, n);
- if (n == 0)
- break;
-
- /* 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;
-
- tmp_pfd = um_kmalloc(n);
- if (tmp_pfd == NULL)
- goto out_kfree;
-
- spin_lock_irqsave(&irq_lock, flags);
- }
- /*-------------*/
-
- *last_irq_ptr = new_fd;
- last_irq_ptr = &new_fd->next;
-
- spin_unlock_irqrestore(&irq_lock, flags);
-
- /* This calls activate_fd, so it has to be outside the critical
- * section.
- */
- maybe_sigio_broken(fd, (type == IRQ_READ));
-
- return(0);
-
- out_unlock:
- spin_unlock_irqrestore(&irq_lock, flags);
- out_kfree:
- kfree(new_fd);
- out:
- return(err);
-}
-
-static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&irq_lock, flags);
- os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr);
- spin_unlock_irqrestore(&irq_lock, flags);
-}
-
-struct irq_and_dev {
- int irq;
- void *dev;
-};
-
-static int same_irq_and_dev(struct irq_fd *irq, void *d)
-{
- struct irq_and_dev *data = d;
-
- return ((irq->irq == data->irq) && (irq->id == data->dev));
-}
-
-void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
-{
- struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
- .dev = dev });
-
- free_irq_by_cb(same_irq_and_dev, &data);
-}
-
-static int same_fd(struct irq_fd *irq, void *fd)
-{
- return (irq->fd == *((int *)fd));
-}
-
-void free_irq_by_fd(int fd)
-{
- free_irq_by_cb(same_fd, &fd);
-}
-
-static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
-{
- struct irq_fd *irq;
- int i = 0;
- int fdi;
-
- 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;
-}
-
-void reactivate_fd(int fd, int irqnum)
-{
- struct irq_fd *irq;
- unsigned long flags;
- int i;
-
- 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);
-
- /* This calls activate_fd, so it has to be outside the critical
- * section.
- */
- maybe_sigio_broken(fd, (irq->type == IRQ_READ));
-}
-
-void deactivate_fd(int fd, int irqnum)
-{
- struct irq_fd *irq;
- unsigned long flags;
- int i;
-
- 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);
-}
-
-int deactivate_all_fds(void)
-{
- struct irq_fd *irq;
- int err;
-
- 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();
-
- return 0;
-}
-
-#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);
- }
-
- irq->pid = pid;
- }
- spin_unlock_irqrestore(&irq_lock, flags);
-}
-#endif
-
/*
* do_IRQ handles all normal device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
{
irq_enter();
- __do_IRQ(irq, (struct pt_regs *)regs);
+ __do_IRQ(irq, (struct pt_regs *) regs);
irq_exit();
return 1;
}
int err;
err = request_irq(irq, handler, irqflags, devname, dev_id);
- if (err)
- return err;
+ if(err)
+ return(err);
- if (fd != -1)
+ if(fd != -1)
err = activate_fd(irq, fd, type, dev_id);
- return err;
+ return(err);
}
EXPORT_SYMBOL(um_request_irq);
EXPORT_SYMBOL(reactivate_fd);
+static DEFINE_SPINLOCK(irq_spinlock);
+
+unsigned long irq_lock(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_spinlock, flags);
+ return(flags);
+}
+
+void irq_unlock(unsigned long flags)
+{
+ spin_unlock_irqrestore(&irq_spinlock, flags);
+}
+
/* hw_interrupt_type must define (startup || enable) &&
* (shutdown || disable) && end */
static void dummy(unsigned int irq)
irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
irq_desc[TIMER_IRQ].action = NULL;
irq_desc[TIMER_IRQ].depth = 1;
- irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type;
+ irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
enable_irq(TIMER_IRQ);
- for (i = 1; i < NR_IRQS; i++) {
+ for(i=1;i<NR_IRQS;i++){
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = NULL;
irq_desc[i].depth = 1;
- irq_desc[i].chip = &normal_irq_type;
+ irq_desc[i].handler = &normal_irq_type;
enable_irq(i);
}
}
int fds[2], err;
err = os_pipe(fds, 1, 1);
- if (err) {
+ if(err){
printk("init_aio_irq - os_pipe failed, err = %d\n", -err);
goto out;
}
err = um_request_irq(irq, fds[0], IRQ_READ, handler,
- IRQF_DISABLED | IRQF_SAMPLE_RANDOM, name,
+ SA_INTERRUPT | SA_SAMPLE_RANDOM, name,
(void *) (long) fds[0]);
- if (err) {
+ if(err){
printk("init_aio_irq - : um_request_irq failed, err = %d\n",
err);
goto out_close;
os_close_file(fds[0]);
os_close_file(fds[1]);
out:
- return err;
+ return(err);
}
git://git.onelab.eu / linux-2.6.git / blobdiff