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412 lines
8.8 KiB
412 lines
8.8 KiB
/*
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* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/poll.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "user_util.h"
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#include "kern_util.h"
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#include "user.h"
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#include "process.h"
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#include "sigio.h"
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#include "irq_user.h"
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#include "os.h"
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struct irq_fd {
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struct irq_fd *next;
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void *id;
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int fd;
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int type;
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int irq;
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int pid;
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int events;
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int current_events;
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};
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static struct irq_fd *active_fds = NULL;
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static struct irq_fd **last_irq_ptr = &active_fds;
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static struct pollfd *pollfds = NULL;
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static int pollfds_num = 0;
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static int pollfds_size = 0;
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extern int io_count, intr_count;
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extern void free_irqs(void);
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void sigio_handler(int sig, union uml_pt_regs *regs)
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{
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struct irq_fd *irq_fd;
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int i, n;
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if(smp_sigio_handler()) return;
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while(1){
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n = poll(pollfds, pollfds_num, 0);
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if(n < 0){
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if(errno == EINTR) continue;
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printk("sigio_handler : poll returned %d, "
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"errno = %d\n", n, errno);
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break;
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}
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if(n == 0) break;
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irq_fd = active_fds;
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for(i = 0; i < pollfds_num; i++){
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if(pollfds[i].revents != 0){
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irq_fd->current_events = pollfds[i].revents;
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pollfds[i].fd = -1;
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}
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irq_fd = irq_fd->next;
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}
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for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){
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if(irq_fd->current_events != 0){
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irq_fd->current_events = 0;
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do_IRQ(irq_fd->irq, regs);
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}
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}
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}
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free_irqs();
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}
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int activate_ipi(int fd, int pid)
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{
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return(os_set_fd_async(fd, pid));
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}
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static void maybe_sigio_broken(int fd, int type)
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{
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if(isatty(fd)){
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if((type == IRQ_WRITE) && !pty_output_sigio){
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write_sigio_workaround();
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add_sigio_fd(fd, 0);
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}
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else if((type == IRQ_READ) && !pty_close_sigio){
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write_sigio_workaround();
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add_sigio_fd(fd, 1);
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}
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}
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}
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int activate_fd(int irq, int fd, int type, void *dev_id)
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{
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struct pollfd *tmp_pfd;
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struct irq_fd *new_fd, *irq_fd;
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unsigned long flags;
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int pid, events, err, n, size;
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pid = os_getpid();
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err = os_set_fd_async(fd, pid);
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if(err < 0)
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goto out;
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new_fd = um_kmalloc(sizeof(*new_fd));
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err = -ENOMEM;
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if(new_fd == NULL)
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goto out;
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if(type == IRQ_READ) events = POLLIN | POLLPRI;
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else events = POLLOUT;
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*new_fd = ((struct irq_fd) { .next = NULL,
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.id = dev_id,
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.fd = fd,
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.type = type,
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.irq = irq,
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.pid = pid,
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.events = events,
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.current_events = 0 } );
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/* Critical section - locked by a spinlock because this stuff can
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* be changed from interrupt handlers. The stuff above is done
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* outside the lock because it allocates memory.
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*/
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/* Actually, it only looks like it can be called from interrupt
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* context. The culprit is reactivate_fd, which calls
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* maybe_sigio_broken, which calls write_sigio_workaround,
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* which calls activate_fd. However, write_sigio_workaround should
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* only be called once, at boot time. That would make it clear that
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* this is called only from process context, and can be locked with
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* a semaphore.
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*/
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flags = irq_lock();
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for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){
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if((irq_fd->fd == fd) && (irq_fd->type == type)){
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printk("Registering fd %d twice\n", fd);
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printk("Irqs : %d, %d\n", irq_fd->irq, irq);
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printk("Ids : 0x%x, 0x%x\n", irq_fd->id, dev_id);
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goto out_unlock;
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}
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}
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n = pollfds_num;
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if(n == pollfds_size){
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while(1){
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/* Here we have to drop the lock in order to call
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* kmalloc, which might sleep. If something else
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* came in and changed the pollfds array, we free
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* the buffer and try again.
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*/
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irq_unlock(flags);
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size = (pollfds_num + 1) * sizeof(pollfds[0]);
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tmp_pfd = um_kmalloc(size);
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flags = irq_lock();
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if(tmp_pfd == NULL)
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goto out_unlock;
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if(n == pollfds_size)
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break;
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kfree(tmp_pfd);
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}
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if(pollfds != NULL){
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memcpy(tmp_pfd, pollfds,
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sizeof(pollfds[0]) * pollfds_size);
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kfree(pollfds);
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}
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pollfds = tmp_pfd;
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pollfds_size++;
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}
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if(type == IRQ_WRITE)
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fd = -1;
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pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
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.events = events,
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.revents = 0 });
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pollfds_num++;
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*last_irq_ptr = new_fd;
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last_irq_ptr = &new_fd->next;
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irq_unlock(flags);
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/* This calls activate_fd, so it has to be outside the critical
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* section.
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*/
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maybe_sigio_broken(fd, type);
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return(0);
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out_unlock:
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irq_unlock(flags);
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kfree(new_fd);
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out:
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return(err);
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}
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static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
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{
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struct irq_fd **prev;
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unsigned long flags;
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int i = 0;
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flags = irq_lock();
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prev = &active_fds;
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while(*prev != NULL){
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if((*test)(*prev, arg)){
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struct irq_fd *old_fd = *prev;
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if((pollfds[i].fd != -1) &&
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(pollfds[i].fd != (*prev)->fd)){
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printk("free_irq_by_cb - mismatch between "
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"active_fds and pollfds, fd %d vs %d\n",
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(*prev)->fd, pollfds[i].fd);
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goto out;
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}
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pollfds_num--;
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/* This moves the *whole* array after pollfds[i] (though
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* it doesn't spot as such)! */
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memmove(&pollfds[i], &pollfds[i + 1],
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(pollfds_num - i) * sizeof(pollfds[0]));
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if(last_irq_ptr == &old_fd->next)
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last_irq_ptr = prev;
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*prev = (*prev)->next;
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if(old_fd->type == IRQ_WRITE)
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ignore_sigio_fd(old_fd->fd);
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kfree(old_fd);
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continue;
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}
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prev = &(*prev)->next;
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i++;
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}
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out:
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irq_unlock(flags);
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}
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struct irq_and_dev {
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int irq;
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void *dev;
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};
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static int same_irq_and_dev(struct irq_fd *irq, void *d)
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{
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struct irq_and_dev *data = d;
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return((irq->irq == data->irq) && (irq->id == data->dev));
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}
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void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
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{
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struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
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.dev = dev });
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free_irq_by_cb(same_irq_and_dev, &data);
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}
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static int same_fd(struct irq_fd *irq, void *fd)
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{
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return(irq->fd == *((int *) fd));
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}
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void free_irq_by_fd(int fd)
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{
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free_irq_by_cb(same_fd, &fd);
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}
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static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
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{
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struct irq_fd *irq;
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int i = 0;
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for(irq=active_fds; irq != NULL; irq = irq->next){
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if((irq->fd == fd) && (irq->irq == irqnum)) break;
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i++;
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}
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if(irq == NULL){
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printk("find_irq_by_fd doesn't have descriptor %d\n", fd);
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goto out;
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}
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if((pollfds[i].fd != -1) && (pollfds[i].fd != fd)){
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printk("find_irq_by_fd - mismatch between active_fds and "
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"pollfds, fd %d vs %d, need %d\n", irq->fd,
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pollfds[i].fd, fd);
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irq = NULL;
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goto out;
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}
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*index_out = i;
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out:
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return(irq);
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}
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void reactivate_fd(int fd, int irqnum)
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{
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struct irq_fd *irq;
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unsigned long flags;
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int i;
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flags = irq_lock();
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irq = find_irq_by_fd(fd, irqnum, &i);
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if(irq == NULL){
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irq_unlock(flags);
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return;
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}
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pollfds[i].fd = irq->fd;
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irq_unlock(flags);
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/* This calls activate_fd, so it has to be outside the critical
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* section.
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*/
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maybe_sigio_broken(fd, irq->type);
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}
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void deactivate_fd(int fd, int irqnum)
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{
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struct irq_fd *irq;
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unsigned long flags;
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int i;
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flags = irq_lock();
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irq = find_irq_by_fd(fd, irqnum, &i);
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if(irq == NULL)
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goto out;
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pollfds[i].fd = -1;
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out:
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irq_unlock(flags);
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}
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int deactivate_all_fds(void)
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{
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struct irq_fd *irq;
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int err;
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for(irq=active_fds;irq != NULL;irq = irq->next){
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err = os_clear_fd_async(irq->fd);
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if(err)
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return(err);
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}
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/* If there is a signal already queued, after unblocking ignore it */
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set_handler(SIGIO, SIG_IGN, 0, -1);
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return(0);
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}
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void forward_ipi(int fd, int pid)
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{
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int err;
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err = os_set_owner(fd, pid);
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if(err < 0)
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printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
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"target = %d, err = %d\n", fd, os_getpid(), pid, -err);
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}
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void forward_interrupts(int pid)
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{
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struct irq_fd *irq;
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unsigned long flags;
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int err;
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flags = irq_lock();
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for(irq=active_fds;irq != NULL;irq = irq->next){
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err = os_set_owner(irq->fd, pid);
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if(err < 0){
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/* XXX Just remove the irq rather than
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* print out an infinite stream of these
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*/
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printk("Failed to forward %d to pid %d, err = %d\n",
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irq->fd, pid, -err);
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}
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irq->pid = pid;
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}
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irq_unlock(flags);
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}
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void init_irq_signals(int on_sigstack)
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{
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__sighandler_t h;
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int flags;
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flags = on_sigstack ? SA_ONSTACK : 0;
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if(timer_irq_inited) h = (__sighandler_t) alarm_handler;
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else h = boot_timer_handler;
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set_handler(SIGVTALRM, h, flags | SA_RESTART,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1);
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set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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signal(SIGWINCH, SIG_IGN);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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