Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c: |
| 5 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
| 6 | */ |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include "linux/kernel.h" |
| 9 | #include "linux/module.h" |
| 10 | #include "linux/smp.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include "linux/kernel_stat.h" |
| 12 | #include "linux/interrupt.h" |
| 13 | #include "linux/random.h" |
| 14 | #include "linux/slab.h" |
| 15 | #include "linux/file.h" |
| 16 | #include "linux/proc_fs.h" |
| 17 | #include "linux/init.h" |
| 18 | #include "linux/seq_file.h" |
| 19 | #include "linux/profile.h" |
| 20 | #include "linux/hardirq.h" |
| 21 | #include "asm/irq.h" |
| 22 | #include "asm/hw_irq.h" |
| 23 | #include "asm/atomic.h" |
| 24 | #include "asm/signal.h" |
| 25 | #include "asm/system.h" |
| 26 | #include "asm/errno.h" |
| 27 | #include "asm/uaccess.h" |
| 28 | #include "user_util.h" |
| 29 | #include "kern_util.h" |
| 30 | #include "irq_user.h" |
| 31 | #include "irq_kern.h" |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 32 | #include "os.h" |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 33 | #include "sigio.h" |
| 34 | #include "misc_constants.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * Generic, controller-independent functions: |
| 38 | */ |
| 39 | |
| 40 | int show_interrupts(struct seq_file *p, void *v) |
| 41 | { |
| 42 | int i = *(loff_t *) v, j; |
| 43 | struct irqaction * action; |
| 44 | unsigned long flags; |
| 45 | |
| 46 | if (i == 0) { |
| 47 | seq_printf(p, " "); |
| 48 | for_each_online_cpu(j) |
| 49 | seq_printf(p, "CPU%d ",j); |
| 50 | seq_putc(p, '\n'); |
| 51 | } |
| 52 | |
| 53 | if (i < NR_IRQS) { |
| 54 | spin_lock_irqsave(&irq_desc[i].lock, flags); |
| 55 | action = irq_desc[i].action; |
| 56 | if (!action) |
| 57 | goto skip; |
| 58 | seq_printf(p, "%3d: ",i); |
| 59 | #ifndef CONFIG_SMP |
| 60 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 61 | #else |
| 62 | for_each_online_cpu(j) |
| 63 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); |
| 64 | #endif |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 65 | seq_printf(p, " %14s", irq_desc[i].chip->typename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | seq_printf(p, " %s", action->name); |
| 67 | |
| 68 | for (action=action->next; action; action = action->next) |
| 69 | seq_printf(p, ", %s", action->name); |
| 70 | |
| 71 | seq_putc(p, '\n'); |
| 72 | skip: |
| 73 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
| 74 | } else if (i == NR_IRQS) { |
| 75 | seq_putc(p, '\n'); |
| 76 | } |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 81 | struct irq_fd *active_fds = NULL; |
| 82 | static struct irq_fd **last_irq_ptr = &active_fds; |
| 83 | |
| 84 | extern void free_irqs(void); |
| 85 | |
| 86 | void sigio_handler(int sig, union uml_pt_regs *regs) |
| 87 | { |
| 88 | struct irq_fd *irq_fd; |
| 89 | int n; |
| 90 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 91 | if (smp_sigio_handler()) |
| 92 | return; |
| 93 | |
| 94 | while (1) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 95 | n = os_waiting_for_events(active_fds); |
| 96 | if (n <= 0) { |
| 97 | if(n == -EINTR) continue; |
| 98 | else break; |
| 99 | } |
| 100 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 101 | for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) { |
| 102 | if (irq_fd->current_events != 0) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 103 | irq_fd->current_events = 0; |
| 104 | do_IRQ(irq_fd->irq, regs); |
| 105 | } |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | free_irqs(); |
| 110 | } |
| 111 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 112 | static DEFINE_SPINLOCK(irq_lock); |
| 113 | |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 114 | int activate_fd(int irq, int fd, int type, void *dev_id) |
| 115 | { |
| 116 | struct pollfd *tmp_pfd; |
| 117 | struct irq_fd *new_fd, *irq_fd; |
| 118 | unsigned long flags; |
| 119 | int pid, events, err, n; |
| 120 | |
| 121 | pid = os_getpid(); |
| 122 | err = os_set_fd_async(fd, pid); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 123 | if (err < 0) |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 124 | goto out; |
| 125 | |
| 126 | new_fd = um_kmalloc(sizeof(*new_fd)); |
| 127 | err = -ENOMEM; |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 128 | if (new_fd == NULL) |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 129 | goto out; |
| 130 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 131 | if (type == IRQ_READ) |
| 132 | events = UM_POLLIN | UM_POLLPRI; |
| 133 | else |
| 134 | events = UM_POLLOUT; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 135 | *new_fd = ((struct irq_fd) { .next = NULL, |
| 136 | .id = dev_id, |
| 137 | .fd = fd, |
| 138 | .type = type, |
| 139 | .irq = irq, |
| 140 | .pid = pid, |
| 141 | .events = events, |
| 142 | .current_events = 0 } ); |
| 143 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 144 | spin_lock_irqsave(&irq_lock, flags); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 145 | for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) { |
| 146 | if ((irq_fd->fd == fd) && (irq_fd->type == type)) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 147 | printk("Registering fd %d twice\n", fd); |
| 148 | printk("Irqs : %d, %d\n", irq_fd->irq, irq); |
| 149 | printk("Ids : 0x%p, 0x%p\n", irq_fd->id, dev_id); |
| 150 | goto out_unlock; |
| 151 | } |
| 152 | } |
| 153 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 154 | if (type == IRQ_WRITE) |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 155 | fd = -1; |
| 156 | |
| 157 | tmp_pfd = NULL; |
| 158 | n = 0; |
| 159 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 160 | while (1) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 161 | n = os_create_pollfd(fd, events, tmp_pfd, n); |
| 162 | if (n == 0) |
| 163 | break; |
| 164 | |
| 165 | /* n > 0 |
| 166 | * It means we couldn't put new pollfd to current pollfds |
| 167 | * and tmp_fds is NULL or too small for new pollfds array. |
| 168 | * Needed size is equal to n as minimum. |
| 169 | * |
| 170 | * Here we have to drop the lock in order to call |
| 171 | * kmalloc, which might sleep. |
| 172 | * If something else came in and changed the pollfds array |
| 173 | * so we will not be able to put new pollfd struct to pollfds |
| 174 | * then we free the buffer tmp_fds and try again. |
| 175 | */ |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 176 | spin_unlock_irqrestore(&irq_lock, flags); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 177 | kfree(tmp_pfd); |
| 178 | tmp_pfd = NULL; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 179 | |
| 180 | tmp_pfd = um_kmalloc(n); |
| 181 | if (tmp_pfd == NULL) |
| 182 | goto out_kfree; |
| 183 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 184 | spin_lock_irqsave(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 185 | } |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 186 | |
| 187 | *last_irq_ptr = new_fd; |
| 188 | last_irq_ptr = &new_fd->next; |
| 189 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 190 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 191 | |
| 192 | /* This calls activate_fd, so it has to be outside the critical |
| 193 | * section. |
| 194 | */ |
Jeff Dike | 8e64d96a | 2006-07-10 04:45:11 -0700 | [diff] [blame] | 195 | maybe_sigio_broken(fd, (type == IRQ_READ)); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 196 | |
Jeff Dike | 19bdf04 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 197 | return 0; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 198 | |
| 199 | out_unlock: |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 200 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 201 | out_kfree: |
| 202 | kfree(new_fd); |
| 203 | out: |
Jeff Dike | 19bdf04 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 204 | return err; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg) |
| 208 | { |
| 209 | unsigned long flags; |
| 210 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 211 | spin_lock_irqsave(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 212 | os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr); |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 213 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | struct irq_and_dev { |
| 217 | int irq; |
| 218 | void *dev; |
| 219 | }; |
| 220 | |
| 221 | static int same_irq_and_dev(struct irq_fd *irq, void *d) |
| 222 | { |
| 223 | struct irq_and_dev *data = d; |
| 224 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 225 | return ((irq->irq == data->irq) && (irq->id == data->dev)); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | void free_irq_by_irq_and_dev(unsigned int irq, void *dev) |
| 229 | { |
| 230 | struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq, |
| 231 | .dev = dev }); |
| 232 | |
| 233 | free_irq_by_cb(same_irq_and_dev, &data); |
| 234 | } |
| 235 | |
| 236 | static int same_fd(struct irq_fd *irq, void *fd) |
| 237 | { |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 238 | return (irq->fd == *((int *)fd)); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | void free_irq_by_fd(int fd) |
| 242 | { |
| 243 | free_irq_by_cb(same_fd, &fd); |
| 244 | } |
| 245 | |
| 246 | static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out) |
| 247 | { |
| 248 | struct irq_fd *irq; |
| 249 | int i = 0; |
| 250 | int fdi; |
| 251 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 252 | for (irq = active_fds; irq != NULL; irq = irq->next) { |
| 253 | if ((irq->fd == fd) && (irq->irq == irqnum)) |
| 254 | break; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 255 | i++; |
| 256 | } |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 257 | if (irq == NULL) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 258 | printk("find_irq_by_fd doesn't have descriptor %d\n", fd); |
| 259 | goto out; |
| 260 | } |
| 261 | fdi = os_get_pollfd(i); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 262 | if ((fdi != -1) && (fdi != fd)) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 263 | printk("find_irq_by_fd - mismatch between active_fds and " |
| 264 | "pollfds, fd %d vs %d, need %d\n", irq->fd, |
| 265 | fdi, fd); |
| 266 | irq = NULL; |
| 267 | goto out; |
| 268 | } |
| 269 | *index_out = i; |
| 270 | out: |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 271 | return irq; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | void reactivate_fd(int fd, int irqnum) |
| 275 | { |
| 276 | struct irq_fd *irq; |
| 277 | unsigned long flags; |
| 278 | int i; |
| 279 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 280 | spin_lock_irqsave(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 281 | irq = find_irq_by_fd(fd, irqnum, &i); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 282 | if (irq == NULL) { |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 283 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 284 | return; |
| 285 | } |
| 286 | os_set_pollfd(i, irq->fd); |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 287 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 288 | |
Jeff Dike | 19bdf04 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 289 | add_sigio_fd(fd); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | void deactivate_fd(int fd, int irqnum) |
| 293 | { |
| 294 | struct irq_fd *irq; |
| 295 | unsigned long flags; |
| 296 | int i; |
| 297 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 298 | spin_lock_irqsave(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 299 | irq = find_irq_by_fd(fd, irqnum, &i); |
Jeff Dike | 19bdf04 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 300 | if(irq == NULL){ |
| 301 | spin_unlock_irqrestore(&irq_lock, flags); |
| 302 | return; |
| 303 | } |
| 304 | |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 305 | os_set_pollfd(i, -1); |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 306 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 19bdf04 | 2006-09-25 23:33:04 -0700 | [diff] [blame] | 307 | |
| 308 | ignore_sigio_fd(fd); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 309 | } |
| 310 | |
| 311 | int deactivate_all_fds(void) |
| 312 | { |
| 313 | struct irq_fd *irq; |
| 314 | int err; |
| 315 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 316 | for (irq = active_fds; irq != NULL; irq = irq->next) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 317 | err = os_clear_fd_async(irq->fd); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 318 | if (err) |
| 319 | return err; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 320 | } |
| 321 | /* If there is a signal already queued, after unblocking ignore it */ |
| 322 | os_set_ioignore(); |
| 323 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 324 | return 0; |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 325 | } |
| 326 | |
Jeff Dike | 8ae43ff | 2006-07-10 04:45:09 -0700 | [diff] [blame] | 327 | #ifdef CONFIG_MODE_TT |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 328 | void forward_interrupts(int pid) |
| 329 | { |
| 330 | struct irq_fd *irq; |
| 331 | unsigned long flags; |
| 332 | int err; |
| 333 | |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 334 | spin_lock_irqsave(&irq_lock, flags); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 335 | for (irq = active_fds; irq != NULL; irq = irq->next) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 336 | err = os_set_owner(irq->fd, pid); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 337 | if (err < 0) { |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 338 | /* XXX Just remove the irq rather than |
| 339 | * print out an infinite stream of these |
| 340 | */ |
| 341 | printk("Failed to forward %d to pid %d, err = %d\n", |
| 342 | irq->fd, pid, -err); |
| 343 | } |
| 344 | |
| 345 | irq->pid = pid; |
| 346 | } |
Jeff Dike | bfaafd7 | 2006-07-10 04:45:10 -0700 | [diff] [blame] | 347 | spin_unlock_irqrestore(&irq_lock, flags); |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 348 | } |
Jeff Dike | 8ae43ff | 2006-07-10 04:45:09 -0700 | [diff] [blame] | 349 | #endif |
Jeff Dike | 9b4f018 | 2006-03-27 01:14:31 -0800 | [diff] [blame] | 350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | /* |
| 352 | * do_IRQ handles all normal device IRQ's (the special |
| 353 | * SMP cross-CPU interrupts have their own specific |
| 354 | * handlers). |
| 355 | */ |
| 356 | unsigned int do_IRQ(int irq, union uml_pt_regs *regs) |
| 357 | { |
| 358 | irq_enter(); |
Pekka Enberg | 96e1a87 | 2006-10-06 00:44:06 -0700 | [diff] [blame] | 359 | __do_IRQ(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | irq_exit(); |
| 361 | return 1; |
| 362 | } |
| 363 | |
| 364 | int um_request_irq(unsigned int irq, int fd, int type, |
| 365 | irqreturn_t (*handler)(int, void *, struct pt_regs *), |
| 366 | unsigned long irqflags, const char * devname, |
| 367 | void *dev_id) |
| 368 | { |
| 369 | int err; |
| 370 | |
| 371 | err = request_irq(irq, handler, irqflags, devname, dev_id); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 372 | if (err) |
| 373 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 375 | if (fd != -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | err = activate_fd(irq, fd, type, dev_id); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 377 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | EXPORT_SYMBOL(um_request_irq); |
| 380 | EXPORT_SYMBOL(reactivate_fd); |
| 381 | |
Paolo 'Blaisorblade' Giarrusso | dbce706 | 2005-06-21 17:16:19 -0700 | [diff] [blame] | 382 | /* hw_interrupt_type must define (startup || enable) && |
| 383 | * (shutdown || disable) && end */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | static void dummy(unsigned int irq) |
| 385 | { |
| 386 | } |
| 387 | |
Paolo 'Blaisorblade' Giarrusso | dbce706 | 2005-06-21 17:16:19 -0700 | [diff] [blame] | 388 | /* This is used for everything else than the timer. */ |
| 389 | static struct hw_interrupt_type normal_irq_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | .typename = "SIGIO", |
Paolo 'Blaisorblade' Giarrusso | dbce706 | 2005-06-21 17:16:19 -0700 | [diff] [blame] | 391 | .release = free_irq_by_irq_and_dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | .disable = dummy, |
| 393 | .enable = dummy, |
| 394 | .ack = dummy, |
| 395 | .end = dummy |
| 396 | }; |
| 397 | |
| 398 | static struct hw_interrupt_type SIGVTALRM_irq_type = { |
| 399 | .typename = "SIGVTALRM", |
Paolo 'Blaisorblade' Giarrusso | dbce706 | 2005-06-21 17:16:19 -0700 | [diff] [blame] | 400 | .release = free_irq_by_irq_and_dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | .shutdown = dummy, /* never called */ |
| 402 | .disable = dummy, |
| 403 | .enable = dummy, |
| 404 | .ack = dummy, |
| 405 | .end = dummy |
| 406 | }; |
| 407 | |
| 408 | void __init init_IRQ(void) |
| 409 | { |
| 410 | int i; |
| 411 | |
| 412 | irq_desc[TIMER_IRQ].status = IRQ_DISABLED; |
| 413 | irq_desc[TIMER_IRQ].action = NULL; |
| 414 | irq_desc[TIMER_IRQ].depth = 1; |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 415 | irq_desc[TIMER_IRQ].chip = &SIGVTALRM_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | enable_irq(TIMER_IRQ); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 417 | for (i = 1; i < NR_IRQS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | irq_desc[i].status = IRQ_DISABLED; |
| 419 | irq_desc[i].action = NULL; |
| 420 | irq_desc[i].depth = 1; |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 421 | irq_desc[i].chip = &normal_irq_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | enable_irq(i); |
| 423 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 426 | int init_aio_irq(int irq, char *name, irqreturn_t (*handler)(int, void *, |
| 427 | struct pt_regs *)) |
| 428 | { |
| 429 | int fds[2], err; |
| 430 | |
| 431 | err = os_pipe(fds, 1, 1); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 432 | if (err) { |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 433 | printk("init_aio_irq - os_pipe failed, err = %d\n", -err); |
| 434 | goto out; |
| 435 | } |
| 436 | |
| 437 | err = um_request_irq(irq, fds[0], IRQ_READ, handler, |
Thomas Gleixner | bd6aa65 | 2006-07-01 19:29:27 -0700 | [diff] [blame] | 438 | IRQF_DISABLED | IRQF_SAMPLE_RANDOM, name, |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 439 | (void *) (long) fds[0]); |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 440 | if (err) { |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 441 | printk("init_aio_irq - : um_request_irq failed, err = %d\n", |
| 442 | err); |
| 443 | goto out_close; |
| 444 | } |
| 445 | |
| 446 | err = fds[1]; |
| 447 | goto out; |
| 448 | |
| 449 | out_close: |
| 450 | os_close_file(fds[0]); |
| 451 | os_close_file(fds[1]); |
| 452 | out: |
Jesper Juhl | 191ef96 | 2006-05-01 12:15:57 -0700 | [diff] [blame] | 453 | return err; |
Jeff Dike | 75e5584 | 2005-09-03 15:57:45 -0700 | [diff] [blame] | 454 | } |