include/linux/irq.h

   1 #ifndef _LINUX_IRQ_H
   2 #define _LINUX_IRQ_H
   3
   4 /*
   5  * Please do not include this file in generic code.  There is currently
   6  * no requirement for any architecture to implement anything held
   7  * within this file.
   8  *
   9  * Thanks. --rmk
  10  */
  11
  12 #include <linux/smp.h>
  13
  14 #ifndef CONFIG_S390
  15
  16 #include <linux/linkage.h>
  17 #include <linux/cache.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/irqreturn.h>
  21 #include <linux/errno.h>
  22
  23 #include <asm/irq.h>
  24 #include <asm/ptrace.h>
  25 #include <asm/irq_regs.h>
  26
  27 struct irq_desc;
  28 typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
  29                                             struct irq_desc *desc);
  30
  31
  32 /*
  33  * IRQ line status.
  34  *
  35  * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
  36  *
  37  * IRQ types
  38  */
  39 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  40 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  41 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  42 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  43 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  44 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  45 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  46 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  47
  48 /* Internal flags */
  49 #define IRQ_INPROGRESS          0x00000100      /* IRQ handler active - do not enter! */
  50 #define IRQ_DISABLED            0x00000200      /* IRQ disabled - do not enter! */
  51 #define IRQ_PENDING             0x00000400      /* IRQ pending - replay on enable */
  52 #define IRQ_REPLAY              0x00000800      /* IRQ has been replayed but not acked yet */
  53 #define IRQ_AUTODETECT          0x00001000      /* IRQ is being autodetected */
  54 #define IRQ_WAITING             0x00002000      /* IRQ not yet seen - for autodetection */
  55 #define IRQ_LEVEL               0x00004000      /* IRQ level triggered */
  56 #define IRQ_MASKED              0x00008000      /* IRQ masked - shouldn't be seen again */
  57 #define IRQ_PER_CPU             0x00010000      /* IRQ is per CPU */
  58 #define IRQ_NOPROBE             0x00020000      /* IRQ is not valid for probing */
  59 #define IRQ_NOREQUEST           0x00040000      /* IRQ cannot be requested */
  60 #define IRQ_NOAUTOEN            0x00080000      /* IRQ will not be enabled on request irq */
  61 #define IRQ_WAKEUP              0x00100000      /* IRQ triggers system wakeup */
  62 #define IRQ_MOVE_PENDING        0x00200000      /* need to re-target IRQ destination */
  63 #define IRQ_NO_BALANCING        0x00400000      /* IRQ is excluded from balancing */
  64
  65 #ifdef CONFIG_IRQ_PER_CPU
  66 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  67 # define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
  68 #else
  69 # define CHECK_IRQ_PER_CPU(var) 0
  70 # define IRQ_NO_BALANCING_MASK  IRQ_NO_BALANCING
  71 #endif
  72
  73 struct proc_dir_entry;
  74 struct msi_desc;
  75
  76 /**
  77  * struct irq_chip - hardware interrupt chip descriptor
  78  *
  79  * @name:               name for /proc/interrupts
  80  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  81  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  82  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  83  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  84  * @ack:                start of a new interrupt
  85  * @mask:               mask an interrupt source
  86  * @mask_ack:           ack and mask an interrupt source
  87  * @unmask:             unmask an interrupt source
  88  * @eoi:                end of interrupt - chip level
  89  * @end:                end of interrupt - flow level
  90  * @set_affinity:       set the CPU affinity on SMP machines
  91  * @retrigger:          resend an IRQ to the CPU
  92  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  93  * @set_wake:           enable/disable power-management wake-on of an IRQ
  94  *
  95  * @release:            release function solely used by UML
  96  * @typename:           obsoleted by name, kept as migration helper
  97  */
  98 struct irq_chip {
  99         const char      *name;
 100         unsigned int    (*startup)(unsigned int irq);
 101         void            (*shutdown)(unsigned int irq);
 102         void            (*enable)(unsigned int irq);
 103         void            (*disable)(unsigned int irq);
 104
 105         void            (*ack)(unsigned int irq);
 106         void            (*mask)(unsigned int irq);
 107         void            (*mask_ack)(unsigned int irq);
 108         void            (*unmask)(unsigned int irq);
 109         void            (*eoi)(unsigned int irq);
 110
 111         void            (*end)(unsigned int irq);
 112         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 113         int             (*retrigger)(unsigned int irq);
 114         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 115         int             (*set_wake)(unsigned int irq, unsigned int on);
 116
 117         /* Currently used only by UML, might disappear one day.*/
 118 #ifdef CONFIG_IRQ_RELEASE_METHOD
 119         void            (*release)(unsigned int irq, void *dev_id);
 120 #endif
 121         /*
 122          * For compatibility, ->typename is copied into ->name.
 123          * Will disappear.
 124          */
 125         const char      *typename;
 126 };
 127
 128 /**
 129  * struct irq_desc - interrupt descriptor
 130  *
 131  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 132  * @chip:               low level interrupt hardware access
 133  * @msi_desc:           MSI descriptor
 134  * @handler_data:       per-IRQ data for the irq_chip methods
 135  * @chip_data:          platform-specific per-chip private data for the chip
 136  *                      methods, to allow shared chip implementations
 137  * @action:             the irq action chain
 138  * @status:             status information
 139  * @depth:              disable-depth, for nested irq_disable() calls
 140  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 141  * @irq_count:          stats field to detect stalled irqs
 142  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 143  * @lock:               locking for SMP
 144  * @affinity:           IRQ affinity on SMP
 145  * @cpu:                cpu index useful for balancing
 146  * @pending_mask:       pending rebalanced interrupts
 147  * @dir:                /proc/irq/ procfs entry
 148  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 149  * @name:               flow handler name for /proc/interrupts output
 150  */
 151 struct irq_desc {
 152         irq_flow_handler_t      handle_irq;
 153         struct irq_chip         *chip;
 154         struct msi_desc         *msi_desc;
 155         void                    *handler_data;
 156         void                    *chip_data;
 157         struct irqaction        *action;        /* IRQ action list */
 158         unsigned int            status;         /* IRQ status */
 159
 160         unsigned int            depth;          /* nested irq disables */
 161         unsigned int            wake_depth;     /* nested wake enables */
 162         unsigned int            irq_count;      /* For detecting broken IRQs */
 163         unsigned int            irqs_unhandled;
 164         unsigned long           last_unhandled; /* Aging timer for unhandled count */
 165         spinlock_t              lock;
 166 #ifdef CONFIG_SMP
 167         cpumask_t               affinity;
 168         unsigned int            cpu;
 169 #endif
 170 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 171         cpumask_t               pending_mask;
 172 #endif
 173 #ifdef CONFIG_PROC_FS
 174         struct proc_dir_entry   *dir;
 175 #endif
 176         const char              *name;
 177 } ____cacheline_internodealigned_in_smp;
 178
 179 extern struct irq_desc irq_desc[NR_IRQS];
 180
 181 /*
 182  * Migration helpers for obsolete names, they will go away:
 183  */
 184 #define hw_interrupt_type       irq_chip
 185 typedef struct irq_chip         hw_irq_controller;
 186 #define no_irq_type             no_irq_chip
 187 typedef struct irq_desc         irq_desc_t;
 188
 189 /*
 190  * Pick up the arch-dependent methods:
 191  */
 192 #include <asm/hw_irq.h>
 193
 194 extern int setup_irq(unsigned int irq, struct irqaction *new);
 195
 196 #ifdef CONFIG_GENERIC_HARDIRQS
 197
 198 #ifndef handle_dynamic_tick
 199 # define handle_dynamic_tick(a)         do { } while (0)
 200 #endif
 201
 202 #ifdef CONFIG_SMP
 203
 204 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 205
 206 void set_pending_irq(unsigned int irq, cpumask_t mask);
 207 void move_native_irq(int irq);
 208 void move_masked_irq(int irq);
 209
 210 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 211
 212 static inline void move_irq(int irq)
 213 {
 214 }
 215
 216 static inline void move_native_irq(int irq)
 217 {
 218 }
 219
 220 static inline void move_masked_irq(int irq)
 221 {
 222 }
 223
 224 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 225 {
 226 }
 227
 228 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 229
 230 extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask);
 231 extern int irq_can_set_affinity(unsigned int irq);
 232
 233 #else /* CONFIG_SMP */
 234
 235 #define move_native_irq(x)
 236 #define move_masked_irq(x)
 237
 238 static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
 239 {
 240         return -EINVAL;
 241 }
 242
 243 static inline int irq_can_set_affinity(unsigned int irq) { return 0; }
 244
 245 #endif /* CONFIG_SMP */
 246
 247 #ifdef CONFIG_IRQBALANCE
 248 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 249 #else
 250 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 251 {
 252 }
 253 #endif
 254
 255 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 256 extern int select_smp_affinity(unsigned int irq);
 257 #else
 258 static inline int select_smp_affinity(unsigned int irq)
 259 {
 260         return 1;
 261 }
 262 #endif
 263
 264 extern int no_irq_affinity;
 265
 266 static inline int irq_balancing_disabled(unsigned int irq)
 267 {
 268         return irq_desc[irq].status & IRQ_NO_BALANCING_MASK;
 269 }
 270
 271 /* Handle irq action chains: */
 272 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
 273
 274 /*
 275  * Built-in IRQ handlers for various IRQ types,
 276  * callable via desc->chip->handle_irq()
 277  */
 278 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
 279 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 280 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 281 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 282 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 283 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 284
 285 /*
 286  * Monolithic do_IRQ implementation.
 287  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 288  */
 289 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 290 extern fastcall unsigned int __do_IRQ(unsigned int irq);
 291 #endif
 292
 293 /*
 294  * Architectures call this to let the generic IRQ layer
 295  * handle an interrupt. If the descriptor is attached to an
 296  * irqchip-style controller then we call the ->handle_irq() handler,
 297  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 298  */
 299 static inline void generic_handle_irq(unsigned int irq)
 300 {
 301         struct irq_desc *desc = irq_desc + irq;
 302
 303 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 304         desc->handle_irq(irq, desc);
 305 #else
 306         if (likely(desc->handle_irq))
 307                 desc->handle_irq(irq, desc);
 308         else
 309                 __do_IRQ(irq);
 310 #endif
 311 }
 312
 313 /* Handling of unhandled and spurious interrupts: */
 314 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 315                            int action_ret);
 316
 317 /* Resending of interrupts :*/
 318 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 319
 320 /* Enable/disable irq debugging output: */
 321 extern int noirqdebug_setup(char *str);
 322
 323 /* Checks whether the interrupt can be requested by request_irq(): */
 324 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 325
 326 /* Dummy irq-chip implementations: */
 327 extern struct irq_chip no_irq_chip;
 328 extern struct irq_chip dummy_irq_chip;
 329
 330 extern void
 331 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 332                          irq_flow_handler_t handle);
 333 extern void
 334 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 335                               irq_flow_handler_t handle, const char *name);
 336
 337 extern void
 338 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 339                   const char *name);
 340
 341 /*
 342  * Set a highlevel flow handler for a given IRQ:
 343  */
 344 static inline void
 345 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 346 {
 347         __set_irq_handler(irq, handle, 0, NULL);
 348 }
 349
 350 /*
 351  * Set a highlevel chained flow handler for a given IRQ.
 352  * (a chained handler is automatically enabled and set to
 353  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 354  */
 355 static inline void
 356 set_irq_chained_handler(unsigned int irq,
 357                         irq_flow_handler_t handle)
 358 {
 359         __set_irq_handler(irq, handle, 1, NULL);
 360 }
 361
 362 /* Handle dynamic irq creation and destruction */
 363 extern int create_irq(void);
 364 extern void destroy_irq(unsigned int irq);
 365
 366 /* Test to see if a driver has successfully requested an irq */
 367 static inline int irq_has_action(unsigned int irq)
 368 {
 369         struct irq_desc *desc = irq_desc + irq;
 370         return desc->action != NULL;
 371 }
 372
 373 /* Dynamic irq helper functions */
 374 extern void dynamic_irq_init(unsigned int irq);
 375 extern void dynamic_irq_cleanup(unsigned int irq);
 376
 377 /* Set/get chip/data for an IRQ: */
 378 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 379 extern int set_irq_data(unsigned int irq, void *data);
 380 extern int set_irq_chip_data(unsigned int irq, void *data);
 381 extern int set_irq_type(unsigned int irq, unsigned int type);
 382 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 383
 384 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 385 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 386 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 387 #define get_irq_msi(irq)        (irq_desc[irq].msi_desc)
 388
 389 #endif /* CONFIG_GENERIC_HARDIRQS */
 390
 391 #endif /* !CONFIG_S390 */
 392
 393 #endif /* _LINUX_IRQ_H */