Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 1 | /* |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <stdlib.h> |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 7 | #include <errno.h> |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 8 | #include <poll.h> |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 9 | #include <signal.h> |
| 10 | #include <string.h> |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 11 | #include <irq_user.h> |
| 12 | #include <os.h> |
| 13 | #include <um_malloc.h> |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 14 | |
Jeff Dike | f2e6299 | 2007-02-10 01:44:23 -0800 | [diff] [blame] | 15 | /* |
| 16 | * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd |
| 17 | * and os_free_irq_by_cb, which are called under irq_lock. |
| 18 | */ |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 19 | static struct pollfd *pollfds = NULL; |
| 20 | static int pollfds_num = 0; |
| 21 | static int pollfds_size = 0; |
| 22 | |
| 23 | int os_waiting_for_events(struct irq_fd *active_fds) |
| 24 | { |
| 25 | struct irq_fd *irq_fd; |
| 26 | int i, n, err; |
| 27 | |
| 28 | n = poll(pollfds, pollfds_num, 0); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 29 | if (n < 0) { |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 30 | err = -errno; |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 31 | if (errno != EINTR) |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 32 | printk(UM_KERN_ERR "os_waiting_for_events:" |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 33 | " poll returned %d, errno = %d\n", n, errno); |
| 34 | return err; |
| 35 | } |
| 36 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 37 | if (n == 0) |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 38 | return 0; |
| 39 | |
| 40 | irq_fd = active_fds; |
| 41 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 42 | for (i = 0; i < pollfds_num; i++) { |
| 43 | if (pollfds[i].revents != 0) { |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 44 | irq_fd->current_events = pollfds[i].revents; |
| 45 | pollfds[i].fd = -1; |
| 46 | } |
| 47 | irq_fd = irq_fd->next; |
| 48 | } |
| 49 | return n; |
| 50 | } |
| 51 | |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 52 | int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds) |
| 53 | { |
| 54 | if (pollfds_num == pollfds_size) { |
| 55 | if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) { |
| 56 | /* return min size needed for new pollfds area */ |
Jeff Dike | f2e6299 | 2007-02-10 01:44:23 -0800 | [diff] [blame] | 57 | return (pollfds_size + 1) * sizeof(pollfds[0]); |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 58 | } |
| 59 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 60 | if (pollfds != NULL) { |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 61 | memcpy(tmp_pfd, pollfds, |
| 62 | sizeof(pollfds[0]) * pollfds_size); |
| 63 | /* remove old pollfds */ |
| 64 | kfree(pollfds); |
| 65 | } |
| 66 | pollfds = tmp_pfd; |
| 67 | pollfds_size++; |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 68 | } else |
| 69 | kfree(tmp_pfd); /* remove not used tmp_pfd */ |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 70 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 71 | pollfds[pollfds_num] = ((struct pollfd) { .fd = fd, |
| 72 | .events = events, |
| 73 | .revents = 0 }); |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 74 | pollfds_num++; |
| 75 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 76 | return 0; |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg, |
| 80 | struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2) |
| 81 | { |
| 82 | struct irq_fd **prev; |
| 83 | int i = 0; |
| 84 | |
| 85 | prev = &active_fds; |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 86 | while (*prev != NULL) { |
| 87 | if ((*test)(*prev, arg)) { |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 88 | struct irq_fd *old_fd = *prev; |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 89 | if ((pollfds[i].fd != -1) && |
| 90 | (pollfds[i].fd != (*prev)->fd)) { |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 91 | printk(UM_KERN_ERR "os_free_irq_by_cb - " |
| 92 | "mismatch between active_fds and " |
| 93 | "pollfds, fd %d vs %d\n", |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 94 | (*prev)->fd, pollfds[i].fd); |
| 95 | goto out; |
| 96 | } |
| 97 | |
| 98 | pollfds_num--; |
| 99 | |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 100 | /* |
| 101 | * This moves the *whole* array after pollfds[i] |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 102 | * (though it doesn't spot as such)! |
| 103 | */ |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 104 | memmove(&pollfds[i], &pollfds[i + 1], |
| 105 | (pollfds_num - i) * sizeof(pollfds[0])); |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 106 | if (*last_irq_ptr2 == &old_fd->next) |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 107 | *last_irq_ptr2 = prev; |
| 108 | |
| 109 | *prev = (*prev)->next; |
Jeff Dike | fee64d3 | 2008-02-04 22:31:02 -0800 | [diff] [blame] | 110 | if (old_fd->type == IRQ_WRITE) |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 111 | ignore_sigio_fd(old_fd->fd); |
| 112 | kfree(old_fd); |
| 113 | continue; |
| 114 | } |
| 115 | prev = &(*prev)->next; |
| 116 | i++; |
| 117 | } |
| 118 | out: |
| 119 | return; |
| 120 | } |
| 121 | |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 122 | int os_get_pollfd(int i) |
| 123 | { |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 124 | return pollfds[i].fd; |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | void os_set_pollfd(int i, int fd) |
| 128 | { |
| 129 | pollfds[i].fd = fd; |
| 130 | } |
| 131 | |
| 132 | void os_set_ioignore(void) |
| 133 | { |
Jeff Dike | 4b84c69 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 134 | signal(SIGIO, SIG_IGN); |
Jeff Dike | 63ae2a9 | 2006-03-27 01:14:30 -0800 | [diff] [blame] | 135 | } |