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 fastcall (*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 65 #ifdef CONFIG_IRQ_PER_CPU 66 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) 67 # define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) 68 #else 69 # define CHECK_IRQ_PER_CPU(var) 0 70 # define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING 71 #endif 72 73 struct proc_dir_entry; 74 struct msi_desc; 75 76 /** 77 * struct irq_chip - hardware interrupt chip descriptor 78 * 79 * @name: name for /proc/interrupts 80 * @startup: start up the interrupt (defaults to ->enable if NULL) 81 * @shutdown: shut down the interrupt (defaults to ->disable if NULL) 82 * @enable: enable the interrupt (defaults to chip->unmask if NULL) 83 * @disable: disable the interrupt (defaults to chip->mask if NULL) 84 * @ack: start of a new interrupt 85 * @mask: mask an interrupt source 86 * @mask_ack: ack and mask an interrupt source 87 * @unmask: unmask an interrupt source 88 * @eoi: end of interrupt - chip level 89 * @end: end of interrupt - flow level 90 * @set_affinity: set the CPU affinity on SMP machines 91 * @retrigger: resend an IRQ to the CPU 92 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ 93 * @set_wake: enable/disable power-management wake-on of an IRQ 94 * 95 * @release: release function solely used by UML 96 * @typename: obsoleted by name, kept as migration helper 97 */ 98 struct irq_chip { 99 const char *name; 100 unsigned int (*startup)(unsigned int irq); 101 void (*shutdown)(unsigned int irq); 102 void (*enable)(unsigned int irq); 103 void (*disable)(unsigned int irq); 104 105 void (*ack)(unsigned int irq); 106 void (*mask)(unsigned int irq); 107 void (*mask_ack)(unsigned int irq); 108 void (*unmask)(unsigned int irq); 109 void (*eoi)(unsigned int irq); 110 111 void (*end)(unsigned int irq); 112 void (*set_affinity)(unsigned int irq, cpumask_t dest); 113 int (*retrigger)(unsigned int irq); 114 int (*set_type)(unsigned int irq, unsigned int flow_type); 115 int (*set_wake)(unsigned int irq, unsigned int on); 116 117 /* Currently used only by UML, might disappear one day.*/ 118 #ifdef CONFIG_IRQ_RELEASE_METHOD 119 void (*release)(unsigned int irq, void *dev_id); 120 #endif 121 /* 122 * For compatibility, ->typename is copied into ->name. 123 * Will disappear. 124 */ 125 const char *typename; 126 }; 127 128 /** 129 * struct irq_desc - interrupt descriptor 130 * 131 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()] 132 * @chip: low level interrupt hardware access 133 * @msi_desc: MSI descriptor 134 * @handler_data: per-IRQ data for the irq_chip methods 135 * @chip_data: platform-specific per-chip private data for the chip 136 * methods, to allow shared chip implementations 137 * @action: the irq action chain 138 * @status: status information 139 * @depth: disable-depth, for nested irq_disable() calls 140 * @wake_depth: enable depth, for multiple set_irq_wake() callers 141 * @irq_count: stats field to detect stalled irqs 142 * @irqs_unhandled: stats field for spurious unhandled interrupts 143 * @lock: locking for SMP 144 * @affinity: IRQ affinity on SMP 145 * @cpu: cpu index useful for balancing 146 * @pending_mask: pending rebalanced interrupts 147 * @dir: /proc/irq/ procfs entry 148 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP 149 * @name: flow handler name for /proc/interrupts output 150 * 151 * Pad this out to 32 bytes for cache and indexing reasons. 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 spinlock_t lock; 167 #ifdef CONFIG_SMP 168 cpumask_t affinity; 169 unsigned int cpu; 170 #endif 171 #if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 172 cpumask_t pending_mask; 173 #endif 174 #ifdef CONFIG_PROC_FS 175 struct proc_dir_entry *dir; 176 #endif 177 const char *name; 178 } ____cacheline_aligned; 179 180 extern struct irq_desc irq_desc[NR_IRQS]; 181 182 /* 183 * Migration helpers for obsolete names, they will go away: 184 */ 185 #define hw_interrupt_type irq_chip 186 typedef struct irq_chip hw_irq_controller; 187 #define no_irq_type no_irq_chip 188 typedef struct irq_desc irq_desc_t; 189 190 /* 191 * Pick up the arch-dependent methods: 192 */ 193 #include <asm/hw_irq.h> 194 195 extern int setup_irq(unsigned int irq, struct irqaction *new); 196 197 #ifdef CONFIG_GENERIC_HARDIRQS 198 199 #ifndef handle_dynamic_tick 200 # define handle_dynamic_tick(a) do { } while (0) 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 void move_masked_irq(int irq); 210 211 #else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ 212 213 static inline void move_irq(int irq) 214 { 215 } 216 217 static inline void move_native_irq(int irq) 218 { 219 } 220 221 static inline void move_masked_irq(int irq) 222 { 223 } 224 225 static inline void set_pending_irq(unsigned int irq, cpumask_t mask) 226 { 227 } 228 229 #endif /* CONFIG_GENERIC_PENDING_IRQ */ 230 231 extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask); 232 extern int irq_can_set_affinity(unsigned int irq); 233 234 #else /* CONFIG_SMP */ 235 236 #define move_native_irq(x) 237 #define move_masked_irq(x) 238 239 static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask) 240 { 241 return -EINVAL; 242 } 243 244 static inline int irq_can_set_affinity(unsigned int irq) { return 0; } 245 246 #endif /* CONFIG_SMP */ 247 248 #ifdef CONFIG_IRQBALANCE 249 extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); 250 #else 251 static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) 252 { 253 } 254 #endif 255 256 #ifdef CONFIG_AUTO_IRQ_AFFINITY 257 extern int select_smp_affinity(unsigned int irq); 258 #else 259 static inline int select_smp_affinity(unsigned int irq) 260 { 261 return 1; 262 } 263 #endif 264 265 extern int no_irq_affinity; 266 267 static inline int irq_balancing_disabled(unsigned int irq) 268 { 269 return irq_desc[irq].status & IRQ_NO_BALANCING_MASK; 270 } 271 272 /* Handle irq action chains: */ 273 extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); 274 275 /* 276 * Built-in IRQ handlers for various IRQ types, 277 * callable via desc->chip->handle_irq() 278 */ 279 extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc); 280 extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); 281 extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc); 282 extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc); 283 extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc); 284 extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc); 285 286 /* 287 * Monolithic do_IRQ implementation. 288 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly) 289 */ 290 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 291 extern fastcall unsigned int __do_IRQ(unsigned int irq); 292 #endif 293 294 /* 295 * Architectures call this to let the generic IRQ layer 296 * handle an interrupt. If the descriptor is attached to an 297 * irqchip-style controller then we call the ->handle_irq() handler, 298 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 299 */ 300 static inline void generic_handle_irq(unsigned int irq) 301 { 302 struct irq_desc *desc = irq_desc + irq; 303 304 #ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 305 desc->handle_irq(irq, desc); 306 #else 307 if (likely(desc->handle_irq)) 308 desc->handle_irq(irq, desc); 309 else 310 __do_IRQ(irq); 311 #endif 312 } 313 314 /* Handling of unhandled and spurious interrupts: */ 315 extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 316 int action_ret); 317 318 /* Resending of interrupts :*/ 319 void check_irq_resend(struct irq_desc *desc, unsigned int irq); 320 321 /* Enable/disable irq debugging output: */ 322 extern int noirqdebug_setup(char *str); 323 324 /* Checks whether the interrupt can be requested by request_irq(): */ 325 extern int can_request_irq(unsigned int irq, unsigned long irqflags); 326 327 /* Dummy irq-chip implementations: */ 328 extern struct irq_chip no_irq_chip; 329 extern struct irq_chip dummy_irq_chip; 330 331 extern void 332 set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 333 irq_flow_handler_t handle); 334 extern void 335 set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 336 irq_flow_handler_t handle, const char *name); 337 338 extern void 339 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 340 const char *name); 341 342 /* 343 * Set a highlevel flow handler for a given IRQ: 344 */ 345 static inline void 346 set_irq_handler(unsigned int irq, irq_flow_handler_t handle) 347 { 348 __set_irq_handler(irq, handle, 0, NULL); 349 } 350 351 /* 352 * Set a highlevel chained flow handler for a given IRQ. 353 * (a chained handler is automatically enabled and set to 354 * IRQ_NOREQUEST and IRQ_NOPROBE) 355 */ 356 static inline void 357 set_irq_chained_handler(unsigned int irq, 358 irq_flow_handler_t handle) 359 { 360 __set_irq_handler(irq, handle, 1, NULL); 361 } 362 363 /* Handle dynamic irq creation and destruction */ 364 extern int create_irq(void); 365 extern void destroy_irq(unsigned int irq); 366 367 /* Test to see if a driver has successfully requested an irq */ 368 static inline int irq_has_action(unsigned int irq) 369 { 370 struct irq_desc *desc = irq_desc + irq; 371 return desc->action != NULL; 372 } 373 374 /* Dynamic irq helper functions */ 375 extern void dynamic_irq_init(unsigned int irq); 376 extern void dynamic_irq_cleanup(unsigned int irq); 377 378 /* Set/get chip/data for an IRQ: */ 379 extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 380 extern int set_irq_data(unsigned int irq, void *data); 381 extern int set_irq_chip_data(unsigned int irq, void *data); 382 extern int set_irq_type(unsigned int irq, unsigned int type); 383 extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); 384 385 #define get_irq_chip(irq) (irq_desc[irq].chip) 386 #define get_irq_chip_data(irq) (irq_desc[irq].chip_data) 387 #define get_irq_data(irq) (irq_desc[irq].handler_data) 388 #define get_irq_msi(irq) (irq_desc[irq].msi_desc) 389 390 #endif /* CONFIG_GENERIC_HARDIRQS */ 391 392 #endif /* !CONFIG_S390 */ 393 394 #endif /* _LINUX_IRQ_H */ 395