148 lines
3 KiB
C
148 lines
3 KiB
C
/*
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* Copyright (C) 2017 - Cambridge Greys Ltd
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* Copyright (C) 2011 - 2014 Cisco Systems Inc
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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 <errno.h>
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#include <sys/epoll.h>
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#include <signal.h>
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#include <string.h>
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#include <irq_user.h>
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#include <os.h>
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#include <um_malloc.h>
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/* Epoll support */
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static int epollfd = -1;
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#define MAX_EPOLL_EVENTS 64
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static struct epoll_event epoll_events[MAX_EPOLL_EVENTS];
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/* Helper to return an Epoll data pointer from an epoll event structure.
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* We need to keep this one on the userspace side to keep includes separate
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*/
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void *os_epoll_get_data_pointer(int index)
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{
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return epoll_events[index].data.ptr;
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}
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/* Helper to compare events versus the events in the epoll structure.
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* Same as above - needs to be on the userspace side
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*/
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int os_epoll_triggered(int index, int events)
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{
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return epoll_events[index].events & events;
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}
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/* Helper to set the event mask.
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* The event mask is opaque to the kernel side, because it does not have
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* access to the right includes/defines for EPOLL constants.
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*/
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int os_event_mask(int irq_type)
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{
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if (irq_type == IRQ_READ)
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return EPOLLIN | EPOLLPRI | EPOLLERR | EPOLLHUP | EPOLLRDHUP;
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if (irq_type == IRQ_WRITE)
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return EPOLLOUT;
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return 0;
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}
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/*
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* Initial Epoll Setup
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*/
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int os_setup_epoll(void)
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{
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epollfd = epoll_create(MAX_EPOLL_EVENTS);
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return epollfd;
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}
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/*
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* Helper to run the actual epoll_wait
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*/
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int os_waiting_for_events_epoll(void)
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{
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int n, err;
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n = epoll_wait(epollfd,
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(struct epoll_event *) &epoll_events, MAX_EPOLL_EVENTS, 0);
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if (n < 0) {
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err = -errno;
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if (errno != EINTR)
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printk(
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UM_KERN_ERR "os_waiting_for_events:"
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" epoll returned %d, error = %s\n", n,
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strerror(errno)
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);
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return err;
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}
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return n;
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}
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/*
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* Helper to add a fd to epoll
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*/
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int os_add_epoll_fd(int events, int fd, void *data)
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{
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struct epoll_event event;
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int result;
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event.data.ptr = data;
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event.events = events | EPOLLET;
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result = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
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if ((result) && (errno == EEXIST))
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result = os_mod_epoll_fd(events, fd, data);
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if (result)
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printk("epollctl add err fd %d, %s\n", fd, strerror(errno));
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return result;
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}
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/*
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* Helper to mod the fd event mask and/or data backreference
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*/
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int os_mod_epoll_fd(int events, int fd, void *data)
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{
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struct epoll_event event;
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int result;
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event.data.ptr = data;
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event.events = events;
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result = epoll_ctl(epollfd, EPOLL_CTL_MOD, fd, &event);
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if (result)
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printk(UM_KERN_ERR
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"epollctl mod err fd %d, %s\n", fd, strerror(errno));
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return result;
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}
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/*
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* Helper to delete the epoll fd
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*/
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int os_del_epoll_fd(int fd)
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{
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struct epoll_event event;
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int result;
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/* This is quiet as we use this as IO ON/OFF - so it is often
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* invoked on a non-existent fd
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*/
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result = epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, &event);
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return result;
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}
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void os_set_ioignore(void)
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{
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signal(SIGIO, SIG_IGN);
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}
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void os_close_epoll_fd(void)
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{
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/* Needed so we do not leak an fd when rebooting */
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os_close_file(epollfd);
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}
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