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 #define IRQ_AFFINITY_SET 0x02000000 /* IRQ affinity was set from userspace*/ 68 69 #ifdef CONFIG_IRQ_PER_CPU 70 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) 71 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) 72 #else 73 # define CHECK_IRQ_PER_CPU(var) 0 74 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING 75 #endif 76 77 struct proc_dir_entry; 78 struct msi_desc; 79 80 /** 81 * struct irq_chip - hardware interrupt chip descriptor 82 * 83 * @name: name for /proc/interrupts 84 * @startup: start up the interrupt (defaults to ->enable if NULL) 85 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) 86 * @enable: enable the interrupt (defaults to chip->unmask if NULL) 87 * @disable: disable the interrupt (defaults to chip->mask if NULL) 88 * @ack: start of a new interrupt 89 * @mask: mask an interrupt source 90 * @mask_ack: ack and mask an interrupt source 91 * @unmask: unmask an interrupt source 92 * @eoi: end of interrupt - chip level 93 * @end: end of interrupt - flow level 94 * @set_affinity: set the CPU affinity on SMP machines 95 * @retrigger: resend an IRQ to the CPU 96 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 97 * @set_wake: enable/disable power-management wake-on of an IRQ 98 * 99 * @release: release function solely used by UML 100 * @typename: obsoleted by name, kept as migration helper 101 */ 102 struct irq_chip { 103 const char *name; 104 unsigned int (*startup)(unsigned int irq); 105 void (*shutdown)(unsigned int irq); 106 void (*enable)(unsigned int irq); 107 void (*disable)(unsigned int irq); 108 109 void (*ack)(unsigned int irq); 110 void (*mask)(unsigned int irq); 111 void (*mask_ack)(unsigned int irq); 112 void (*unmask)(unsigned int irq); 113 void (*eoi)(unsigned int irq); 114 115 void (*end)(unsigned int irq); 116 void (*set_affinity)(unsigned int irq, cpumask_t dest); 117 int (*retrigger)(unsigned int irq); 118 int (*set_type)(unsigned int irq, unsigned int flow_type); 119 int (*set_wake)(unsigned int irq, unsigned int on); 120 121 /* Currently used only by UML, might disappear one day.*/ 122 #ifdef CONFIG_IRQ_RELEASE_METHOD 123 void (*release)(unsigned int irq, void *dev_id); 124 #endif 125 /* 126 * For compatibility, ->typename is copied into ->name. 127 * Will disappear. 128 */ 129 const char *typename; 130 }; 131 132 /** 133 * struct irq_desc - interrupt descriptor 134 * @irq: interrupt number for this descriptor 135 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] 136 * @chip: low level interrupt hardware access 137 * @msi_desc: MSI descriptor 138 * @handler_data: per-IRQ data for the irq_chip methods 139 * @chip_data: platform-specific per-chip private data for the chip 140 * methods, to allow shared chip implementations 141 * @action: the irq action chain 142 * @status: status information 143 * @depth: disable-depth, for nested irq_disable() calls 144 * @wake_depth: enable depth, for multiple set_irq_wake() callers 145 * @irq_count: stats field to detect stalled irqs 146 * @irqs_unhandled: stats field for spurious unhandled interrupts 147 * @last_unhandled: aging timer for unhandled count 148 * @lock: locking for SMP 149 * @affinity: IRQ affinity on SMP 150 * @cpu: cpu index useful for balancing 151 * @pending_mask: pending rebalanced interrupts 152 * @dir: /proc/irq/ procfs entry 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 move_native_irq(int irq); 214 void move_masked_irq(int irq); 215 216 #else /* CONFIG_GENERIC_PENDING_IRQ */ 217 218 static inline void move_irq(int irq) 219 { 220 } 221 222 static inline void move_native_irq(int irq) 223 { 224 } 225 226 static inline void move_masked_irq(int irq) 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 extern int no_irq_affinity; 240 241 static inline int irq_balancing_disabled(unsigned int irq) 242 { 243 struct irq_desc *desc; 244 245 desc = irq_to_desc(irq); 246 return desc->status & IRQ_NO_BALANCING_MASK; 247 } 248 249 /* Handle irq action chains: */ 250 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); 251 252 /* 253 * Built-in IRQ handlers for various IRQ types, 254 * callable via desc->chip->handle_irq() 255 */ 256 extern void handle_level_irq(unsigned int irq, struct irq_desc *desc); 257 extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); 258 extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc); 259 extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc); 260 extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc); 261 extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); 262 263 /* 264 * Monolithic do_IRQ implementation. 265 */ 266 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 267 extern unsigned int __do_IRQ(unsigned int irq); 268 #endif 269 270 /* 271 * Architectures call this to let the generic IRQ layer 272 * handle an interrupt. If the descriptor is attached to an 273 * irqchip-style controller then we call the ->handle_irq() handler, 274 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 275 */ 276 static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc) 277 { 278 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 279 desc->handle_irq(irq, desc); 280 #else 281 if (likely(desc->handle_irq)) 282 desc->handle_irq(irq, desc); 283 else 284 __do_IRQ(irq); 285 #endif 286 } 287 288 static inline void generic_handle_irq(unsigned int irq) 289 { 290 generic_handle_irq_desc(irq, irq_to_desc(irq)); 291 } 292 293 /* Handling of unhandled and spurious interrupts: */ 294 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 295 int action_ret); 296 297 /* Resending of interrupts :*/ 298 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 299 300 /* Enable/disable irq debugging output: */ 301 extern int noirqdebug_setup(char *str); 302 303 /* Checks whether the interrupt can be requested by request_irq(): */ 304 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 305 306 /* Dummy irq-chip implementations: */ 307 extern struct irq_chip no_irq_chip; 308 extern struct irq_chip dummy_irq_chip; 309 310 extern void 311 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 312 irq_flow_handler_t handle); 313 extern void 314 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 315 irq_flow_handler_t handle, const char *name); 316 317 extern void 318 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 319 const char *name); 320 321 /* caller has locked the irq_desc and both params are valid */ 322 static inline void __set_irq_handler_unlocked(int irq, 323 irq_flow_handler_t handler) 324 { 325 struct irq_desc *desc; 326 327 desc = irq_to_desc(irq); 328 desc->handle_irq = handler; 329 } 330 331 /* 332 * Set a highlevel flow handler for a given IRQ: 333 */ 334 static inline void 335 set_irq_handler(unsigned int irq, irq_flow_handler_t handle) 336 { 337 __set_irq_handler(irq, handle, 0, NULL); 338 } 339 340 /* 341 * Set a highlevel chained flow handler for a given IRQ. 342 * (a chained handler is automatically enabled and set to 343 * IRQ_NOREQUEST and IRQ_NOPROBE) 344 */ 345 static inline void 346 set_irq_chained_handler(unsigned int irq, 347 irq_flow_handler_t handle) 348 { 349 __set_irq_handler(irq, handle, 1, NULL); 350 } 351 352 extern void set_irq_noprobe(unsigned int irq); 353 extern void set_irq_probe(unsigned int irq); 354 355 /* Handle dynamic irq creation and destruction */ 356 extern unsigned int create_irq_nr(unsigned int irq_want); 357 extern int create_irq(void); 358 extern void destroy_irq(unsigned int irq); 359 360 /* Test to see if a driver has successfully requested an irq */ 361 static inline int irq_has_action(unsigned int irq) 362 { 363 struct irq_desc *desc = irq_to_desc(irq); 364 return desc->action != NULL; 365 } 366 367 /* Dynamic irq helper functions */ 368 extern void dynamic_irq_init(unsigned int irq); 369 extern void dynamic_irq_cleanup(unsigned int irq); 370 371 /* Set/get chip/data for an IRQ: */ 372 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 373 extern int set_irq_data(unsigned int irq, void *data); 374 extern int set_irq_chip_data(unsigned int irq, void *data); 375 extern int set_irq_type(unsigned int irq, unsigned int type); 376 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); 377 378 #define get_irq_chip(irq) (irq_to_desc(irq)->chip) 379 #define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data) 380 #define get_irq_data(irq) (irq_to_desc(irq)->handler_data) 381 #define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc) 382 383 #endif /* CONFIG_GENERIC_HARDIRQS */ 384 385 #endif /* !CONFIG_S390 */ 386 387 #endif /* _LINUX_IRQ_H */ 388