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
  22 #include <asm/irq.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/irq_regs.h>
  25
  26 struct irq_desc;
  27 typedef void fastcall (*irq_flow_handler_t)(unsigned int irq,
  28                                             struct irq_desc *desc);
  29
  30
  31 /*
  32  * IRQ line status.
  33  *
  34  * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h
  35  *
  36  * IRQ types
  37  */
  38 #define IRQ_TYPE_NONE           0x00000000      /* Default, unspecified type */
  39 #define IRQ_TYPE_EDGE_RISING    0x00000001      /* Edge rising type */
  40 #define IRQ_TYPE_EDGE_FALLING   0x00000002      /* Edge falling type */
  41 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
  42 #define IRQ_TYPE_LEVEL_HIGH     0x00000004      /* Level high type */
  43 #define IRQ_TYPE_LEVEL_LOW      0x00000008      /* Level low type */
  44 #define IRQ_TYPE_SENSE_MASK     0x0000000f      /* Mask of the above */
  45 #define IRQ_TYPE_PROBE          0x00000010      /* Probing in progress */
  46
  47 /* Internal flags */
  48 #define IRQ_INPROGRESS          0x00010000      /* IRQ handler active - do not enter! */
  49 #define IRQ_DISABLED            0x00020000      /* IRQ disabled - do not enter! */
  50 #define IRQ_PENDING             0x00040000      /* IRQ pending - replay on enable */
  51 #define IRQ_REPLAY              0x00080000      /* IRQ has been replayed but not acked yet */
  52 #define IRQ_AUTODETECT          0x00100000      /* IRQ is being autodetected */
  53 #define IRQ_WAITING             0x00200000      /* IRQ not yet seen - for autodetection */
  54 #define IRQ_LEVEL               0x00400000      /* IRQ level triggered */
  55 #define IRQ_MASKED              0x00800000      /* IRQ masked - shouldn't be seen again */
  56 #define IRQ_PER_CPU             0x01000000      /* IRQ is per CPU */
  57 #ifdef CONFIG_IRQ_PER_CPU
  58 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
  59 #else
  60 # define CHECK_IRQ_PER_CPU(var) 0
  61 #endif
  62
  63 #define IRQ_NOPROBE             0x02000000      /* IRQ is not valid for probing */
  64 #define IRQ_NOREQUEST           0x04000000      /* IRQ cannot be requested */
  65 #define IRQ_NOAUTOEN            0x08000000      /* IRQ will not be enabled on request irq */
  66 #define IRQ_DELAYED_DISABLE     0x10000000      /* IRQ disable (masking) happens delayed. */
  67 #define IRQ_WAKEUP              0x20000000      /* IRQ triggers system wakeup */
  68 #define IRQ_MOVE_PENDING        0x40000000      /* need to re-target IRQ destination */
  69
  70 struct proc_dir_entry;
  71 struct msi_desc;
  72
  73 /**
  74  * struct irq_chip - hardware interrupt chip descriptor
  75  *
  76  * @name:               name for /proc/interrupts
  77  * @startup:            start up the interrupt (defaults to ->enable if NULL)
  78  * @shutdown:           shut down the interrupt (defaults to ->disable if NULL)
  79  * @enable:             enable the interrupt (defaults to chip->unmask if NULL)
  80  * @disable:            disable the interrupt (defaults to chip->mask if NULL)
  81  * @ack:                start of a new interrupt
  82  * @mask:               mask an interrupt source
  83  * @mask_ack:           ack and mask an interrupt source
  84  * @unmask:             unmask an interrupt source
  85  * @eoi:                end of interrupt - chip level
  86  * @end:                end of interrupt - flow level
  87  * @set_affinity:       set the CPU affinity on SMP machines
  88  * @retrigger:          resend an IRQ to the CPU
  89  * @set_type:           set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
  90  * @set_wake:           enable/disable power-management wake-on of an IRQ
  91  *
  92  * @release:            release function solely used by UML
  93  * @typename:           obsoleted by name, kept as migration helper
  94  */
  95 struct irq_chip {
  96         const char      *name;
  97         unsigned int    (*startup)(unsigned int irq);
  98         void            (*shutdown)(unsigned int irq);
  99         void            (*enable)(unsigned int irq);
 100         void            (*disable)(unsigned int irq);
 101
 102         void            (*ack)(unsigned int irq);
 103         void            (*mask)(unsigned int irq);
 104         void            (*mask_ack)(unsigned int irq);
 105         void            (*unmask)(unsigned int irq);
 106         void            (*eoi)(unsigned int irq);
 107
 108         void            (*end)(unsigned int irq);
 109         void            (*set_affinity)(unsigned int irq, cpumask_t dest);
 110         int             (*retrigger)(unsigned int irq);
 111         int             (*set_type)(unsigned int irq, unsigned int flow_type);
 112         int             (*set_wake)(unsigned int irq, unsigned int on);
 113
 114         /* Currently used only by UML, might disappear one day.*/
 115 #ifdef CONFIG_IRQ_RELEASE_METHOD
 116         void            (*release)(unsigned int irq, void *dev_id);
 117 #endif
 118         /*
 119          * For compatibility, ->typename is copied into ->name.
 120          * Will disappear.
 121          */
 122         const char      *typename;
 123 };
 124
 125 /**
 126  * struct irq_desc - interrupt descriptor
 127  *
 128  * @handle_irq:         highlevel irq-events handler [if NULL, __do_IRQ()]
 129  * @chip:               low level interrupt hardware access
 130  * @handler_data:       per-IRQ data for the irq_chip methods
 131  * @chip_data:          platform-specific per-chip private data for the chip
 132  *                      methods, to allow shared chip implementations
 133  * @action:             the irq action chain
 134  * @status:             status information
 135  * @depth:              disable-depth, for nested irq_disable() calls
 136  * @wake_depth:         enable depth, for multiple set_irq_wake() callers
 137  * @irq_count:          stats field to detect stalled irqs
 138  * @irqs_unhandled:     stats field for spurious unhandled interrupts
 139  * @lock:               locking for SMP
 140  * @affinity:           IRQ affinity on SMP
 141  * @cpu:                cpu index useful for balancing
 142  * @pending_mask:       pending rebalanced interrupts
 143  * @dir:                /proc/irq/ procfs entry
 144  * @affinity_entry:     /proc/irq/smp_affinity procfs entry on SMP
 145  * @name:               flow handler name for /proc/interrupts output
 146  *
 147  * Pad this out to 32 bytes for cache and indexing reasons.
 148  */
 149 struct irq_desc {
 150         irq_flow_handler_t      handle_irq;
 151         struct irq_chip         *chip;
 152         struct msi_desc         *msi_desc;
 153         void                    *handler_data;
 154         void                    *chip_data;
 155         struct irqaction        *action;        /* IRQ action list */
 156         unsigned int            status;         /* IRQ status */
 157
 158         unsigned int            depth;          /* nested irq disables */
 159         unsigned int            wake_depth;     /* nested wake enables */
 160         unsigned int            irq_count;      /* For detecting broken IRQs */
 161         unsigned int            irqs_unhandled;
 162         spinlock_t              lock;
 163 #ifdef CONFIG_SMP
 164         cpumask_t               affinity;
 165         unsigned int            cpu;
 166 #endif
 167 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 168         cpumask_t               pending_mask;
 169 #endif
 170 #ifdef CONFIG_PROC_FS
 171         struct proc_dir_entry   *dir;
 172 #endif
 173         const char              *name;
 174 } ____cacheline_aligned;
 175
 176 extern struct irq_desc irq_desc[NR_IRQS];
 177
 178 /*
 179  * Migration helpers for obsolete names, they will go away:
 180  */
 181 #define hw_interrupt_type       irq_chip
 182 typedef struct irq_chip         hw_irq_controller;
 183 #define no_irq_type             no_irq_chip
 184 typedef struct irq_desc         irq_desc_t;
 185
 186 /*
 187  * Pick up the arch-dependent methods:
 188  */
 189 #include <asm/hw_irq.h>
 190
 191 extern int setup_irq(unsigned int irq, struct irqaction *new);
 192
 193 #ifdef CONFIG_GENERIC_HARDIRQS
 194
 195 #ifndef handle_dynamic_tick
 196 # define handle_dynamic_tick(a)         do { } while (0)
 197 #endif
 198
 199 #ifdef CONFIG_SMP
 200 static inline void set_native_irq_info(int irq, cpumask_t mask)
 201 {
 202         irq_desc[irq].affinity = mask;
 203 }
 204 #else
 205 static inline void set_native_irq_info(int irq, cpumask_t mask)
 206 {
 207 }
 208 #endif
 209
 210 #ifdef CONFIG_SMP
 211
 212 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
 213
 214 void set_pending_irq(unsigned int irq, cpumask_t mask);
 215 void move_native_irq(int irq);
 216 void move_masked_irq(int irq);
 217
 218 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */
 219
 220 static inline void move_irq(int irq)
 221 {
 222 }
 223
 224 static inline void move_native_irq(int irq)
 225 {
 226 }
 227
 228 static inline void move_masked_irq(int irq)
 229 {
 230 }
 231
 232 static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
 233 {
 234 }
 235
 236 #endif /* CONFIG_GENERIC_PENDING_IRQ */
 237
 238 #else /* CONFIG_SMP */
 239
 240 #define move_native_irq(x)
 241 #define move_masked_irq(x)
 242
 243 #endif /* CONFIG_SMP */
 244
 245 #ifdef CONFIG_IRQBALANCE
 246 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask);
 247 #else
 248 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask)
 249 {
 250 }
 251 #endif
 252
 253 #ifdef CONFIG_AUTO_IRQ_AFFINITY
 254 extern int select_smp_affinity(unsigned int irq);
 255 #else
 256 static inline int select_smp_affinity(unsigned int irq)
 257 {
 258         return 1;
 259 }
 260 #endif
 261
 262 extern int no_irq_affinity;
 263
 264 /* Handle irq action chains: */
 265 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
 266
 267 /*
 268  * Built-in IRQ handlers for various IRQ types,
 269  * callable via desc->chip->handle_irq()
 270  */
 271 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc);
 272 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
 273 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc);
 274 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc);
 275 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
 276 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc);
 277
 278 /*
 279  * Monolithic do_IRQ implementation.
 280  * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly)
 281  */
 282 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 283 extern fastcall unsigned int __do_IRQ(unsigned int irq);
 284 #endif
 285
 286 /*
 287  * Architectures call this to let the generic IRQ layer
 288  * handle an interrupt. If the descriptor is attached to an
 289  * irqchip-style controller then we call the ->handle_irq() handler,
 290  * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
 291  */
 292 static inline void generic_handle_irq(unsigned int irq)
 293 {
 294         struct irq_desc *desc = irq_desc + irq;
 295
 296 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
 297         desc->handle_irq(irq, desc);
 298 #else
 299         if (likely(desc->handle_irq))
 300                 desc->handle_irq(irq, desc);
 301         else
 302                 __do_IRQ(irq);
 303 #endif
 304 }
 305
 306 /* Handling of unhandled and spurious interrupts: */
 307 extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
 308                            int action_ret);
 309
 310 /* Resending of interrupts :*/
 311 void check_irq_resend(struct irq_desc *desc, unsigned int irq);
 312
 313 /* Initialize /proc/irq/ */
 314 extern void init_irq_proc(void);
 315
 316 /* Enable/disable irq debugging output: */
 317 extern int noirqdebug_setup(char *str);
 318
 319 /* Checks whether the interrupt can be requested by request_irq(): */
 320 extern int can_request_irq(unsigned int irq, unsigned long irqflags);
 321
 322 /* Dummy irq-chip implementations: */
 323 extern struct irq_chip no_irq_chip;
 324 extern struct irq_chip dummy_irq_chip;
 325
 326 extern void
 327 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
 328                          irq_flow_handler_t handle);
 329 extern void
 330 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
 331                               irq_flow_handler_t handle, const char *name);
 332
 333 extern void
 334 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 335                   const char *name);
 336
 337 /*
 338  * Set a highlevel flow handler for a given IRQ:
 339  */
 340 static inline void
 341 set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
 342 {
 343         __set_irq_handler(irq, handle, 0, NULL);
 344 }
 345
 346 /*
 347  * Set a highlevel chained flow handler for a given IRQ.
 348  * (a chained handler is automatically enabled and set to
 349  *  IRQ_NOREQUEST and IRQ_NOPROBE)
 350  */
 351 static inline void
 352 set_irq_chained_handler(unsigned int irq,
 353                         irq_flow_handler_t handle)
 354 {
 355         __set_irq_handler(irq, handle, 1, NULL);
 356 }
 357
 358 /* Handle dynamic irq creation and destruction */
 359 extern int create_irq(void);
 360 extern void destroy_irq(unsigned int irq);
 361
 362 /* Test to see if a driver has successfully requested an irq */
 363 static inline int irq_has_action(unsigned int irq)
 364 {
 365         struct irq_desc *desc = irq_desc + irq;
 366         return desc->action != NULL;
 367 }
 368
 369 /* Dynamic irq helper functions */
 370 extern void dynamic_irq_init(unsigned int irq);
 371 extern void dynamic_irq_cleanup(unsigned int irq);
 372
 373 /* Set/get chip/data for an IRQ: */
 374 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
 375 extern int set_irq_data(unsigned int irq, void *data);
 376 extern int set_irq_chip_data(unsigned int irq, void *data);
 377 extern int set_irq_type(unsigned int irq, unsigned int type);
 378 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
 379
 380 #define get_irq_chip(irq)       (irq_desc[irq].chip)
 381 #define get_irq_chip_data(irq)  (irq_desc[irq].chip_data)
 382 #define get_irq_data(irq)       (irq_desc[irq].handler_data)
 383 #define get_irq_msi(irq)        (irq_desc[irq].msi_desc)
 384
 385 #endif /* CONFIG_GENERIC_HARDIRQS */
 386
 387 #endif /* !CONFIG_S390 */
 388
 389 #endif /* _LINUX_IRQ_H */