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 25 /* 26 * IRQ line status. 27 * 28 * Bits 0-16 are reserved for the IRQF_* bits in linux/interrupt.h 29 * 30 * IRQ types 31 */ 32 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ 33 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ 34 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ 35 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) 36 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ 37 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ 38 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ 39 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ 40 41 /* Internal flags */ 42 #define IRQ_INPROGRESS 0x00010000 /* IRQ handler active - do not enter! */ 43 #define IRQ_DISABLED 0x00020000 /* IRQ disabled - do not enter! */ 44 #define IRQ_PENDING 0x00040000 /* IRQ pending - replay on enable */ 45 #define IRQ_REPLAY 0x00080000 /* IRQ has been replayed but not acked yet */ 46 #define IRQ_AUTODETECT 0x00100000 /* IRQ is being autodetected */ 47 #define IRQ_WAITING 0x00200000 /* IRQ not yet seen - for autodetection */ 48 #define IRQ_LEVEL 0x00400000 /* IRQ level triggered */ 49 #define IRQ_MASKED 0x00800000 /* IRQ masked - shouldn't be seen again */ 50 #define IRQ_PER_CPU 0x01000000 /* IRQ is per CPU */ 51 #ifdef CONFIG_IRQ_PER_CPU 52 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) 53 #else 54 # define CHECK_IRQ_PER_CPU(var) 0 55 #endif 56 57 #define IRQ_NOPROBE 0x02000000 /* IRQ is not valid for probing */ 58 #define IRQ_NOREQUEST 0x04000000 /* IRQ cannot be requested */ 59 #define IRQ_NOAUTOEN 0x08000000 /* IRQ will not be enabled on request irq */ 60 #define IRQ_DELAYED_DISABLE 0x10000000 /* IRQ disable (masking) happens delayed. */ 61 #define IRQ_WAKEUP 0x20000000 /* IRQ triggers system wakeup */ 62 63 struct proc_dir_entry; 64 65 /** 66 * struct irq_chip - hardware interrupt chip descriptor 67 * 68 * @name: name for /proc/interrupts 69 * @startup: start up the interrupt (defaults to ->enable if NULL) 70 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) 71 * @enable: enable the interrupt (defaults to chip->unmask if NULL) 72 * @disable: disable the interrupt (defaults to chip->mask if NULL) 73 * @ack: start of a new interrupt 74 * @mask: mask an interrupt source 75 * @mask_ack: ack and mask an interrupt source 76 * @unmask: unmask an interrupt source 77 * @eoi: end of interrupt - chip level 78 * @end: end of interrupt - flow level 79 * @set_affinity: set the CPU affinity on SMP machines 80 * @retrigger: resend an IRQ to the CPU 81 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 82 * @set_wake: enable/disable power-management wake-on of an IRQ 83 * 84 * @release: release function solely used by UML 85 * @typename: obsoleted by name, kept as migration helper 86 */ 87 struct irq_chip { 88 const char *name; 89 unsigned int (*startup)(unsigned int irq); 90 void (*shutdown)(unsigned int irq); 91 void (*enable)(unsigned int irq); 92 void (*disable)(unsigned int irq); 93 94 void (*ack)(unsigned int irq); 95 void (*mask)(unsigned int irq); 96 void (*mask_ack)(unsigned int irq); 97 void (*unmask)(unsigned int irq); 98 void (*eoi)(unsigned int irq); 99 100 void (*end)(unsigned int irq); 101 void (*set_affinity)(unsigned int irq, cpumask_t dest); 102 int (*retrigger)(unsigned int irq); 103 int (*set_type)(unsigned int irq, unsigned int flow_type); 104 int (*set_wake)(unsigned int irq, unsigned int on); 105 106 /* Currently used only by UML, might disappear one day.*/ 107 #ifdef CONFIG_IRQ_RELEASE_METHOD 108 void (*release)(unsigned int irq, void *dev_id); 109 #endif 110 /* 111 * For compatibility, ->typename is copied into ->name. 112 * Will disappear. 113 */ 114 const char *typename; 115 }; 116 117 /** 118 * struct irq_desc - interrupt descriptor 119 * 120 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] 121 * @chip: low level interrupt hardware access 122 * @handler_data: per-IRQ data for the irq_chip methods 123 * @chip_data: platform-specific per-chip private data for the chip 124 * methods, to allow shared chip implementations 125 * @action: the irq action chain 126 * @status: status information 127 * @depth: disable-depth, for nested irq_disable() calls 128 * @wake_depth: enable depth, for multiple set_irq_wake() callers 129 * @irq_count: stats field to detect stalled irqs 130 * @irqs_unhandled: stats field for spurious unhandled interrupts 131 * @lock: locking for SMP 132 * @affinity: IRQ affinity on SMP 133 * @cpu: cpu index useful for balancing 134 * @pending_mask: pending rebalanced interrupts 135 * @move_irq: need to re-target IRQ destination 136 * @dir: /proc/irq/ procfs entry 137 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP 138 * 139 * Pad this out to 32 bytes for cache and indexing reasons. 140 */ 141 struct irq_desc { 142 void fastcall (*handle_irq)(unsigned int irq, 143 struct irq_desc *desc, 144 struct pt_regs *regs); 145 struct irq_chip *chip; 146 void *handler_data; 147 void *chip_data; 148 struct irqaction *action; /* IRQ action list */ 149 unsigned int status; /* IRQ status */ 150 151 unsigned int depth; /* nested irq disables */ 152 unsigned int wake_depth; /* nested wake enables */ 153 unsigned int irq_count; /* For detecting broken IRQs */ 154 unsigned int irqs_unhandled; 155 spinlock_t lock; 156 #ifdef CONFIG_SMP 157 cpumask_t affinity; 158 unsigned int cpu; 159 #endif 160 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 161 cpumask_t pending_mask; 162 unsigned int move_irq; /* need to re-target IRQ dest */ 163 #endif 164 #ifdef CONFIG_PROC_FS 165 struct proc_dir_entry *dir; 166 #endif 167 } ____cacheline_aligned; 168 169 extern struct irq_desc irq_desc[NR_IRQS]; 170 171 /* 172 * Migration helpers for obsolete names, they will go away: 173 */ 174 #define hw_interrupt_type irq_chip 175 typedef struct irq_chip hw_irq_controller; 176 #define no_irq_type no_irq_chip 177 typedef struct irq_desc irq_desc_t; 178 179 /* 180 * Pick up the arch-dependent methods: 181 */ 182 #include <asm/hw_irq.h> 183 184 extern int setup_irq(unsigned int irq, struct irqaction *new); 185 186 #ifdef CONFIG_GENERIC_HARDIRQS 187 188 #ifndef handle_dynamic_tick 189 # define handle_dynamic_tick(a) do { } while (0) 190 #endif 191 192 #ifdef CONFIG_SMP 193 static inline void set_native_irq_info(int irq, cpumask_t mask) 194 { 195 irq_desc[irq].affinity = mask; 196 } 197 #else 198 static inline void set_native_irq_info(int irq, cpumask_t mask) 199 { 200 } 201 #endif 202 203 #ifdef CONFIG_SMP 204 205 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 206 207 void set_pending_irq(unsigned int irq, cpumask_t mask); 208 void move_native_irq(int irq); 209 210 #ifdef CONFIG_PCI_MSI 211 /* 212 * Wonder why these are dummies? 213 * For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq() 214 * counter part after translating the vector to irq info. We need to perform 215 * this operation on the real irq, when we dont use vector, i.e when 216 * pci_use_vector() is false. 217 */ 218 static inline void move_irq(int irq) 219 { 220 } 221 222 static inline void set_irq_info(int irq, cpumask_t mask) 223 { 224 } 225 226 #else /* CONFIG_PCI_MSI */ 227 228 static inline void move_irq(int irq) 229 { 230 move_native_irq(irq); 231 } 232 233 static inline void set_irq_info(int irq, cpumask_t mask) 234 { 235 set_native_irq_info(irq, mask); 236 } 237 238 #endif /* CONFIG_PCI_MSI */ 239 240 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ 241 242 static inline void move_irq(int irq) 243 { 244 } 245 246 static inline void move_native_irq(int irq) 247 { 248 } 249 250 static inline void set_pending_irq(unsigned int irq, cpumask_t mask) 251 { 252 } 253 254 static inline void set_irq_info(int irq, cpumask_t mask) 255 { 256 set_native_irq_info(irq, mask); 257 } 258 259 #endif /* CONFIG_GENERIC_PENDING_IRQ */ 260 261 #else /* CONFIG_SMP */ 262 263 #define move_irq(x) 264 #define move_native_irq(x) 265 266 #endif /* CONFIG_SMP */ 267 268 #ifdef CONFIG_IRQBALANCE 269 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); 270 #else 271 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) 272 { 273 } 274 #endif 275 276 #ifdef CONFIG_AUTO_IRQ_AFFINITY 277 extern int select_smp_affinity(unsigned int irq); 278 #else 279 static inline int select_smp_affinity(unsigned int irq) 280 { 281 return 1; 282 } 283 #endif 284 285 extern int no_irq_affinity; 286 287 /* Handle irq action chains: */ 288 extern int handle_IRQ_event(unsigned int irq, struct pt_regs *regs, 289 struct irqaction *action); 290 291 /* 292 * Built-in IRQ handlers for various IRQ types, 293 * callable via desc->chip->handle_irq() 294 */ 295 extern void fastcall 296 handle_level_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); 297 extern void fastcall 298 handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc, 299 struct pt_regs *regs); 300 extern void fastcall 301 handle_edge_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); 302 extern void fastcall 303 handle_simple_irq(unsigned int irq, struct irq_desc *desc, 304 struct pt_regs *regs); 305 extern void fastcall 306 handle_percpu_irq(unsigned int irq, struct irq_desc *desc, 307 struct pt_regs *regs); 308 extern void fastcall 309 handle_bad_irq(unsigned int irq, struct irq_desc *desc, struct pt_regs *regs); 310 311 /* 312 * Get a descriptive string for the highlevel handler, for 313 * /proc/interrupts output: 314 */ 315 extern const char * 316 handle_irq_name(void fastcall (*handle)(unsigned int, struct irq_desc *, 317 struct pt_regs *)); 318 319 /* 320 * Monolithic do_IRQ implementation. 321 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly) 322 */ 323 extern fastcall unsigned int __do_IRQ(unsigned int irq, struct pt_regs *regs); 324 325 /* 326 * Architectures call this to let the generic IRQ layer 327 * handle an interrupt. If the descriptor is attached to an 328 * irqchip-style controller then we call the ->handle_irq() handler, 329 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 330 */ 331 static inline void generic_handle_irq(unsigned int irq, struct pt_regs *regs) 332 { 333 struct irq_desc *desc = irq_desc + irq; 334 335 if (likely(desc->handle_irq)) 336 desc->handle_irq(irq, desc, regs); 337 else 338 __do_IRQ(irq, regs); 339 } 340 341 /* Handling of unhandled and spurious interrupts: */ 342 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 343 int action_ret, struct pt_regs *regs); 344 345 /* Resending of interrupts :*/ 346 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 347 348 /* Initialize /proc/irq/ */ 349 extern void init_irq_proc(void); 350 351 /* Enable/disable irq debugging output: */ 352 extern int noirqdebug_setup(char *str); 353 354 /* Checks whether the interrupt can be requested by request_irq(): */ 355 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 356 357 /* Dummy irq-chip implementations: */ 358 extern struct irq_chip no_irq_chip; 359 extern struct irq_chip dummy_irq_chip; 360 361 extern void 362 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 363 void fastcall (*handle)(unsigned int, 364 struct irq_desc *, 365 struct pt_regs *)); 366 extern void 367 __set_irq_handler(unsigned int irq, 368 void fastcall (*handle)(unsigned int, struct irq_desc *, 369 struct pt_regs *), 370 int is_chained); 371 372 /* 373 * Set a highlevel flow handler for a given IRQ: 374 */ 375 static inline void 376 set_irq_handler(unsigned int irq, 377 void fastcall (*handle)(unsigned int, struct irq_desc *, 378 struct pt_regs *)) 379 { 380 __set_irq_handler(irq, handle, 0); 381 } 382 383 /* 384 * Set a highlevel chained flow handler for a given IRQ. 385 * (a chained handler is automatically enabled and set to 386 * IRQ_NOREQUEST and IRQ_NOPROBE) 387 */ 388 static inline void 389 set_irq_chained_handler(unsigned int irq, 390 void fastcall (*handle)(unsigned int, struct irq_desc *, 391 struct pt_regs *)) 392 { 393 __set_irq_handler(irq, handle, 1); 394 } 395 396 /* Set/get chip/data for an IRQ: */ 397 398 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 399 extern int set_irq_data(unsigned int irq, void *data); 400 extern int set_irq_chip_data(unsigned int irq, void *data); 401 extern int set_irq_type(unsigned int irq, unsigned int type); 402 403 #define get_irq_chip(irq) (irq_desc[irq].chip) 404 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data) 405 #define get_irq_data(irq) (irq_desc[irq].handler_data) 406 407 #endif /* CONFIG_GENERIC_HARDIRQS */ 408 409 #endif /* !CONFIG_S390 */ 410 411 #endif /* _LINUX_IRQ_H */ 412
