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 (*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 #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ 65 66 #ifdef CONFIG_IRQ_PER_CPU 67 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) 68 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) 69 #else 70 # define CHECK_IRQ_PER_CPU(var) 0 71 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING 72 #endif 73 74 struct proc_dir_entry; 75 struct msi_desc; 76 77 /** 78 * struct irq_chip - hardware interrupt chip descriptor 79 * 80 * @name: name for /proc/interrupts 81 * @startup: start up the interrupt (defaults to ->enable if NULL) 82 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) 83 * @enable: enable the interrupt (defaults to chip->unmask if NULL) 84 * @disable: disable the interrupt (defaults to chip->mask if NULL) 85 * @ack: start of a new interrupt 86 * @mask: mask an interrupt source 87 * @mask_ack: ack and mask an interrupt source 88 * @unmask: unmask an interrupt source 89 * @eoi: end of interrupt - chip level 90 * @end: end of interrupt - flow level 91 * @set_affinity: set the CPU affinity on SMP machines 92 * @retrigger: resend an IRQ to the CPU 93 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 94 * @set_wake: enable/disable power-management wake-on of an IRQ 95 * 96 * @release: release function solely used by UML 97 * @typename: obsoleted by name, kept as migration helper 98 */ 99 struct irq_chip { 100 const char *name; 101 unsigned int (*startup)(unsigned int irq); 102 void (*shutdown)(unsigned int irq); 103 void (*enable)(unsigned int irq); 104 void (*disable)(unsigned int irq); 105 106 void (*ack)(unsigned int irq); 107 void (*mask)(unsigned int irq); 108 void (*mask_ack)(unsigned int irq); 109 void (*unmask)(unsigned int irq); 110 void (*eoi)(unsigned int irq); 111 112 void (*end)(unsigned int irq); 113 void (*set_affinity)(unsigned int irq, cpumask_t dest); 114 int (*retrigger)(unsigned int irq); 115 int (*set_type)(unsigned int irq, unsigned int flow_type); 116 int (*set_wake)(unsigned int irq, unsigned int on); 117 118 /* Currently used only by UML, might disappear one day.*/ 119 #ifdef CONFIG_IRQ_RELEASE_METHOD 120 void (*release)(unsigned int irq, void *dev_id); 121 #endif 122 /* 123 * For compatibility, ->typename is copied into ->name. 124 * Will disappear. 125 */ 126 const char *typename; 127 }; 128 129 /** 130 * struct irq_desc - interrupt descriptor 131 * 132 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] 133 * @chip: low level interrupt hardware access 134 * @msi_desc: MSI descriptor 135 * @handler_data: per-IRQ data for the irq_chip methods 136 * @chip_data: platform-specific per-chip private data for the chip 137 * methods, to allow shared chip implementations 138 * @action: the irq action chain 139 * @status: status information 140 * @depth: disable-depth, for nested irq_disable() calls 141 * @wake_depth: enable depth, for multiple set_irq_wake() callers 142 * @irq_count: stats field to detect stalled irqs 143 * @irqs_unhandled: stats field for spurious unhandled interrupts 144 * @last_unhandled: aging timer for unhandled count 145 * @lock: locking for SMP 146 * @affinity: IRQ affinity on SMP 147 * @cpu: cpu index useful for balancing 148 * @pending_mask: pending rebalanced interrupts 149 * @dir: /proc/irq/ procfs entry 150 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP 151 * @name: flow handler name for /proc/interrupts output 152 */ 153 struct irq_desc { 154 irq_flow_handler_t handle_irq; 155 struct irq_chip *chip; 156 struct msi_desc *msi_desc; 157 void *handler_data; 158 void *chip_data; 159 struct irqaction *action; /* IRQ action list */ 160 unsigned int status; /* IRQ status */ 161 162 unsigned int depth; /* nested irq disables */ 163 unsigned int wake_depth; /* nested wake enables */ 164 unsigned int irq_count; /* For detecting broken IRQs */ 165 unsigned int irqs_unhandled; 166 unsigned long last_unhandled; /* Aging timer for unhandled count */ 167 spinlock_t lock; 168 #ifdef CONFIG_SMP 169 cpumask_t affinity; 170 unsigned int cpu; 171 #endif 172 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 173 cpumask_t pending_mask; 174 #endif 175 #ifdef CONFIG_PROC_FS 176 struct proc_dir_entry *dir; 177 #endif 178 const char *name; 179 } ____cacheline_internodealigned_in_smp; 180 181 extern struct irq_desc irq_desc[NR_IRQS]; 182 183 /* 184 * Migration helpers for obsolete names, they will go away: 185 */ 186 #define hw_interrupt_type irq_chip 187 typedef struct irq_chip hw_irq_controller; 188 #define no_irq_type no_irq_chip 189 typedef struct irq_desc irq_desc_t; 190 191 /* 192 * Pick up the arch-dependent methods: 193 */ 194 #include <asm/hw_irq.h> 195 196 extern int setup_irq(unsigned int irq, struct irqaction *new); 197 198 #ifdef CONFIG_GENERIC_HARDIRQS 199 200 #ifndef handle_dynamic_tick 201 # define handle_dynamic_tick(a) do { } while (0) 202 #endif 203 204 #ifdef CONFIG_SMP 205 206 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 207 208 void set_pending_irq(unsigned int irq, cpumask_t mask); 209 void move_native_irq(int irq); 210 void move_masked_irq(int irq); 211 212 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ 213 214 static inline void move_irq(int irq) 215 { 216 } 217 218 static inline void move_native_irq(int irq) 219 { 220 } 221 222 static inline void move_masked_irq(int irq) 223 { 224 } 225 226 static inline void set_pending_irq(unsigned int irq, cpumask_t mask) 227 { 228 } 229 230 #endif /* CONFIG_GENERIC_PENDING_IRQ */ 231 232 #else /* CONFIG_SMP */ 233 234 #define move_native_irq(x) 235 #define move_masked_irq(x) 236 237 #endif /* CONFIG_SMP */ 238 239 #ifdef CONFIG_IRQBALANCE 240 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); 241 #else 242 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) 243 { 244 } 245 #endif 246 247 extern int no_irq_affinity; 248 249 static inline int irq_balancing_disabled(unsigned int irq) 250 { 251 return irq_desc[irq].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(unsigned int irq) 282 { 283 struct irq_desc *desc = irq_desc + irq; 284 285 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 286 desc->handle_irq(irq, desc); 287 #else 288 if (likely(desc->handle_irq)) 289 desc->handle_irq(irq, desc); 290 else 291 __do_IRQ(irq); 292 #endif 293 } 294 295 /* Handling of unhandled and spurious interrupts: */ 296 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 297 int action_ret); 298 299 /* Resending of interrupts :*/ 300 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 301 302 /* Enable/disable irq debugging output: */ 303 extern int noirqdebug_setup(char *str); 304 305 /* Checks whether the interrupt can be requested by request_irq(): */ 306 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 307 308 /* Dummy irq-chip implementations: */ 309 extern struct irq_chip no_irq_chip; 310 extern struct irq_chip dummy_irq_chip; 311 312 extern void 313 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 314 irq_flow_handler_t handle); 315 extern void 316 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 317 irq_flow_handler_t handle, const char *name); 318 319 extern void 320 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 321 const char *name); 322 323 /* caller has locked the irq_desc and both params are valid */ 324 static inline void __set_irq_handler_unlocked(int irq, 325 irq_flow_handler_t handler) 326 { 327 irq_desc[irq].handle_irq = handler; 328 } 329 330 /* 331 * Set a highlevel flow handler for a given IRQ: 332 */ 333 static inline void 334 set_irq_handler(unsigned int irq, irq_flow_handler_t handle) 335 { 336 __set_irq_handler(irq, handle, 0, NULL); 337 } 338 339 /* 340 * Set a highlevel chained flow handler for a given IRQ. 341 * (a chained handler is automatically enabled and set to 342 * IRQ_NOREQUEST and IRQ_NOPROBE) 343 */ 344 static inline void 345 set_irq_chained_handler(unsigned int irq, 346 irq_flow_handler_t handle) 347 { 348 __set_irq_handler(irq, handle, 1, NULL); 349 } 350 351 extern void set_irq_noprobe(unsigned int irq); 352 extern void set_irq_probe(unsigned int irq); 353 354 /* Handle dynamic irq creation and destruction */ 355 extern int create_irq(void); 356 extern void destroy_irq(unsigned int irq); 357 358 /* Test to see if a driver has successfully requested an irq */ 359 static inline int irq_has_action(unsigned int irq) 360 { 361 struct irq_desc *desc = irq_desc + irq; 362 return desc->action != NULL; 363 } 364 365 /* Dynamic irq helper functions */ 366 extern void dynamic_irq_init(unsigned int irq); 367 extern void dynamic_irq_cleanup(unsigned int irq); 368 369 /* Set/get chip/data for an IRQ: */ 370 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 371 extern int set_irq_data(unsigned int irq, void *data); 372 extern int set_irq_chip_data(unsigned int irq, void *data); 373 extern int set_irq_type(unsigned int irq, unsigned int type); 374 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); 375 376 #define get_irq_chip(irq) (irq_desc[irq].chip) 377 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data) 378 #define get_irq_data(irq) (irq_desc[irq].handler_data) 379 #define get_irq_msi(irq) (irq_desc[irq].msi_desc) 380 381 #endif /* CONFIG_GENERIC_HARDIRQS */ 382 383 #endif /* !CONFIG_S390 */ 384 385 #endif /* _LINUX_IRQ_H */ 386