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/irqnr.h> 22 #include <linux/errno.h> 23 24 #include <asm/irq.h> 25 #include <asm/ptrace.h> 26 #include <asm/irq_regs.h> 27 28 struct irq_desc; 29 typedef void (*irq_flow_handler_t)(unsigned int irq, 30 struct irq_desc *desc); 31 32 33 /* 34 * IRQ line status. 35 * 36 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h 37 * 38 * IRQ types 39 */ 40 #define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */ 41 #define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */ 42 #define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */ 43 #define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING) 44 #define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */ 45 #define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */ 46 #define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */ 47 #define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */ 48 49 /* Internal flags */ 50 #define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */ 51 #define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */ 52 #define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */ 53 #define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */ 54 #define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */ 55 #define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */ 56 #define IRQ_LEVEL 0x00004000 /* IRQ level triggered */ 57 #define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */ 58 #define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */ 59 #define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */ 60 #define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */ 61 #define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */ 62 #define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */ 63 #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ 64 #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ 65 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ 66 #define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ 67 68 #ifdef CONFIG_IRQ_PER_CPU 69 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) 70 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) 71 #else 72 # define CHECK_IRQ_PER_CPU(var) 0 73 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING 74 #endif 75 76 struct proc_dir_entry; 77 struct msi_desc; 78 79 /** 80 * struct irq_chip - hardware interrupt chip descriptor 81 * 82 * @name: name for /proc/interrupts 83 * @startup: start up the interrupt (defaults to ->enable if NULL) 84 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) 85 * @enable: enable the interrupt (defaults to chip->unmask if NULL) 86 * @disable: disable the interrupt (defaults to chip->mask if NULL) 87 * @ack: start of a new interrupt 88 * @mask: mask an interrupt source 89 * @mask_ack: ack and mask an interrupt source 90 * @unmask: unmask an interrupt source 91 * @eoi: end of interrupt - chip level 92 * @end: end of interrupt - flow level 93 * @set_affinity: set the CPU affinity on SMP machines 94 * @retrigger: resend an IRQ to the CPU 95 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 96 * @set_wake: enable/disable power-management wake-on of an IRQ 97 * 98 * @release: release function solely used by UML 99 * @typename: obsoleted by name, kept as migration helper 100 */ 101 struct irq_chip { 102 const char *name; 103 unsigned int (*startup)(unsigned int irq); 104 void (*shutdown)(unsigned int irq); 105 void (*enable)(unsigned int irq); 106 void (*disable)(unsigned int irq); 107 108 void (*ack)(unsigned int irq); 109 void (*mask)(unsigned int irq); 110 void (*mask_ack)(unsigned int irq); 111 void (*unmask)(unsigned int irq); 112 void (*eoi)(unsigned int irq); 113 114 void (*end)(unsigned int irq); 115 void (*set_affinity)(unsigned int irq, cpumask_t dest); 116 int (*retrigger)(unsigned int irq); 117 int (*set_type)(unsigned int irq, unsigned int flow_type); 118 int (*set_wake)(unsigned int irq, unsigned int on); 119 120 /* Currently used only by UML, might disappear one day.*/ 121 #ifdef CONFIG_IRQ_RELEASE_METHOD 122 void (*release)(unsigned int irq, void *dev_id); 123 #endif 124 /* 125 * For compatibility, ->typename is copied into ->name. 126 * Will disappear. 127 */ 128 const char *typename; 129 }; 130 131 /** 132 * struct irq_desc - interrupt descriptor 133 * 134 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] 135 * @chip: low level interrupt hardware access 136 * @msi_desc: MSI descriptor 137 * @handler_data: per-IRQ data for the irq_chip methods 138 * @chip_data: platform-specific per-chip private data for the chip 139 * methods, to allow shared chip implementations 140 * @action: the irq action chain 141 * @status: status information 142 * @depth: disable-depth, for nested irq_disable() calls 143 * @wake_depth: enable depth, for multiple set_irq_wake() callers 144 * @irq_count: stats field to detect stalled irqs 145 * @irqs_unhandled: stats field for spurious unhandled interrupts 146 * @last_unhandled: aging timer for unhandled count 147 * @lock: locking for SMP 148 * @affinity: IRQ affinity on SMP 149 * @cpu: cpu index useful for balancing 150 * @pending_mask: pending rebalanced interrupts 151 * @dir: /proc/irq/ procfs entry 152 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP 153 * @name: flow handler name for /proc/interrupts output 154 */ 155 struct irq_desc { 156 unsigned int irq; 157 irq_flow_handler_t handle_irq; 158 struct irq_chip *chip; 159 struct msi_desc *msi_desc; 160 void *handler_data; 161 void *chip_data; 162 struct irqaction *action; /* IRQ action list */ 163 unsigned int status; /* IRQ status */ 164 165 unsigned int depth; /* nested irq disables */ 166 unsigned int wake_depth; /* nested wake enables */ 167 unsigned int irq_count; /* For detecting broken IRQs */ 168 unsigned int irqs_unhandled; 169 unsigned long last_unhandled; /* Aging timer for unhandled count */ 170 spinlock_t lock; 171 #ifdef CONFIG_SMP 172 cpumask_t affinity; 173 unsigned int cpu; 174 #endif 175 #ifdef CONFIG_GENERIC_PENDING_IRQ 176 cpumask_t pending_mask; 177 #endif 178 #ifdef CONFIG_PROC_FS 179 struct proc_dir_entry *dir; 180 #endif 181 const char *name; 182 } ____cacheline_internodealigned_in_smp; 183 184 185 extern struct irq_desc irq_desc[NR_IRQS]; 186 187 static inline struct irq_desc *irq_to_desc(unsigned int irq) 188 { 189 return (irq < nr_irqs) ? irq_desc + irq : NULL; 190 } 191 192 /* 193 * Migration helpers for obsolete names, they will go away: 194 */ 195 #define hw_interrupt_type irq_chip 196 typedef struct irq_chip hw_irq_controller; 197 #define no_irq_type no_irq_chip 198 typedef struct irq_desc irq_desc_t; 199 200 /* 201 * Pick up the arch-dependent methods: 202 */ 203 #include <asm/hw_irq.h> 204 205 extern int setup_irq(unsigned int irq, struct irqaction *new); 206 207 #ifdef CONFIG_GENERIC_HARDIRQS 208 209 #ifdef CONFIG_SMP 210 211 #ifdef CONFIG_GENERIC_PENDING_IRQ 212 213 void set_pending_irq(unsigned int irq, cpumask_t mask); 214 void move_native_irq(int irq); 215 void move_masked_irq(int irq); 216 217 #else /* CONFIG_GENERIC_PENDING_IRQ */ 218 219 static inline void move_irq(int irq) 220 { 221 } 222 223 static inline void move_native_irq(int irq) 224 { 225 } 226 227 static inline void move_masked_irq(int irq) 228 { 229 } 230 231 static inline void set_pending_irq(unsigned int irq, cpumask_t mask) 232 { 233 } 234 235 #endif /* CONFIG_GENERIC_PENDING_IRQ */ 236 237 #else /* CONFIG_SMP */ 238 239 #define move_native_irq(x) 240 #define move_masked_irq(x) 241 242 #endif /* CONFIG_SMP */ 243 244 extern int no_irq_affinity; 245 246 static inline int irq_balancing_disabled(unsigned int irq) 247 { 248 struct irq_desc *desc; 249 250 desc = irq_to_desc(irq); 251 return desc->status & IRQ_NO_BALANCING_MASK; 252 } 253 254 /* Handle irq action chains: */ 255 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); 256 257 /* 258 * Built-in IRQ handlers for various IRQ types, 259 * callable via desc->chip->handle_irq() 260 */ 261 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); 262 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); 263 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); 264 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); 265 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); 266 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); 267 268 /* 269 * Monolithic do_IRQ implementation. 270 */ 271 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 272 extern unsigned int __do_IRQ(unsigned int irq); 273 #endif 274 275 /* 276 * Architectures call this to let the generic IRQ layer 277 * handle an interrupt. If the descriptor is attached to an 278 * irqchip-style controller then we call the ->handle_irq() handler, 279 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 280 */ 281 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) 282 { 283 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 284 desc->handle_irq(irq, desc); 285 #else 286 if (likely(desc->handle_irq)) 287 desc->handle_irq(irq, desc); 288 else 289 __do_IRQ(irq); 290 #endif 291 } 292 293 static inline void generic_handle_irq(unsigned int irq) 294 { 295 generic_handle_irq_desc(irq, irq_to_desc(irq)); 296 } 297 298 /* Handling of unhandled and spurious interrupts: */ 299 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 300 int action_ret); 301 302 /* Resending of interrupts :*/ 303 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 304 305 /* Enable/disable irq debugging output: */ 306 extern int noirqdebug_setup(char *str); 307 308 /* Checks whether the interrupt can be requested by request_irq(): */ 309 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 310 311 /* Dummy irq-chip implementations: */ 312 extern struct irq_chip no_irq_chip; 313 extern struct irq_chip dummy_irq_chip; 314 315 extern void 316 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 317 irq_flow_handler_t handle); 318 extern void 319 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 320 irq_flow_handler_t handle, const char *name); 321 322 extern void 323 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 324 const char *name); 325 326 /* caller has locked the irq_desc and both params are valid */ 327 static inline void __set_irq_handler_unlocked(int irq, 328 irq_flow_handler_t handler) 329 { 330 struct irq_desc *desc; 331 332 desc = irq_to_desc(irq); 333 desc->handle_irq = handler; 334 } 335 336 /* 337 * Set a highlevel flow handler for a given IRQ: 338 */ 339 static inline void 340 set_irq_handler(unsigned int irq, irq_flow_handler_t handle) 341 { 342 __set_irq_handler(irq, handle, 0, NULL); 343 } 344 345 /* 346 * Set a highlevel chained flow handler for a given IRQ. 347 * (a chained handler is automatically enabled and set to 348 * IRQ_NOREQUEST and IRQ_NOPROBE) 349 */ 350 static inline void 351 set_irq_chained_handler(unsigned int irq, 352 irq_flow_handler_t handle) 353 { 354 __set_irq_handler(irq, handle, 1, NULL); 355 } 356 357 extern void set_irq_noprobe(unsigned int irq); 358 extern void set_irq_probe(unsigned int irq); 359 360 /* Handle dynamic irq creation and destruction */ 361 extern unsigned int create_irq_nr(unsigned int irq_want); 362 extern int create_irq(void); 363 extern void destroy_irq(unsigned int irq); 364 365 /* Test to see if a driver has successfully requested an irq */ 366 static inline int irq_has_action(unsigned int irq) 367 { 368 struct irq_desc *desc = irq_to_desc(irq); 369 return desc->action != NULL; 370 } 371 372 /* Dynamic irq helper functions */ 373 extern void dynamic_irq_init(unsigned int irq); 374 extern void dynamic_irq_cleanup(unsigned int irq); 375 376 /* Set/get chip/data for an IRQ: */ 377 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 378 extern int set_irq_data(unsigned int irq, void *data); 379 extern int set_irq_chip_data(unsigned int irq, void *data); 380 extern int set_irq_type(unsigned int irq, unsigned int type); 381 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); 382 383 #define get_irq_chip(irq) (irq_to_desc(irq)->chip) 384 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) 385 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) 386 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) 387 388 #endif /* CONFIG_GENERIC_HARDIRQS */ 389 390 #endif /* !CONFIG_S390 */ 391 392 #endif /* _LINUX_IRQ_H */ 393