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 27struct irq_desc; 28typedef 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 73struct proc_dir_entry; 74struct 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 */ 98struct 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 */ 151struct irq_desc { 152 irq_flow_handler_t handle_irq; 153 struct irq_chip *chip; 154 struct msi_desc *msi_desc; 155 void *handler_data; 156 void *chip_data; 157 struct irqaction *action; /* IRQ action list */ 158 unsigned int status; /* IRQ status */ 159 160 unsigned int depth; /* nested irq disables */ 161 unsigned int wake_depth; /* nested wake enables */ 162 unsigned int irq_count; /* For detecting broken IRQs */ 163 unsigned int irqs_unhandled; 164 spinlock_t lock; 165#ifdef CONFIG_SMP 166 cpumask_t affinity; 167 unsigned int cpu; 168#endif 169#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 170 cpumask_t pending_mask; 171#endif 172#ifdef CONFIG_PROC_FS 173 struct proc_dir_entry *dir; 174#endif 175 const char *name; 176} ____cacheline_internodealigned_in_smp; 177 178extern struct irq_desc irq_desc[NR_IRQS]; 179 180/* 181 * Migration helpers for obsolete names, they will go away: 182 */ 183#define hw_interrupt_type irq_chip 184typedef struct irq_chip hw_irq_controller; 185#define no_irq_type no_irq_chip 186typedef struct irq_desc irq_desc_t; 187 188/* 189 * Pick up the arch-dependent methods: 190 */ 191#include <asm/hw_irq.h> 192 193extern int setup_irq(unsigned int irq, struct irqaction *new); 194 195#ifdef CONFIG_GENERIC_HARDIRQS 196 197#ifndef handle_dynamic_tick 198# define handle_dynamic_tick(a) do { } while (0) 199#endif 200 201#ifdef CONFIG_SMP 202 203#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE) 204 205void set_pending_irq(unsigned int irq, cpumask_t mask); 206void move_native_irq(int irq); 207void move_masked_irq(int irq); 208 209#else /* CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE */ 210 211static inline void move_irq(int irq) 212{ 213} 214 215static inline void move_native_irq(int irq) 216{ 217} 218 219static inline void move_masked_irq(int irq) 220{ 221} 222 223static inline void set_pending_irq(unsigned int irq, cpumask_t mask) 224{ 225} 226 227#endif /* CONFIG_GENERIC_PENDING_IRQ */ 228 229extern int irq_set_affinity(unsigned int irq, cpumask_t cpumask); 230extern int irq_can_set_affinity(unsigned int irq); 231 232#else /* CONFIG_SMP */ 233 234#define move_native_irq(x) 235#define move_masked_irq(x) 236 237static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask) 238{ 239 return -EINVAL; 240} 241 242static inline int irq_can_set_affinity(unsigned int irq) { return 0; } 243 244#endif /* CONFIG_SMP */ 245 246#ifdef CONFIG_IRQBALANCE 247extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); 248#else 249static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) 250{ 251} 252#endif 253 254#ifdef CONFIG_AUTO_IRQ_AFFINITY 255extern int select_smp_affinity(unsigned int irq); 256#else 257static inline int select_smp_affinity(unsigned int irq) 258{ 259 return 1; 260} 261#endif 262 263extern int no_irq_affinity; 264 265static inline int irq_balancing_disabled(unsigned int irq) 266{ 267 return irq_desc[irq].status & IRQ_NO_BALANCING_MASK; 268} 269 270/* Handle irq action chains: */ 271extern int handle_IRQ_event(unsigned int irq, struct irqaction *action); 272 273/* 274 * Built-in IRQ handlers for various IRQ types, 275 * callable via desc->chip->handle_irq() 276 */ 277extern void fastcall handle_level_irq(unsigned int irq, struct irq_desc *desc); 278extern void fastcall handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc); 279extern void fastcall handle_edge_irq(unsigned int irq, struct irq_desc *desc); 280extern void fastcall handle_simple_irq(unsigned int irq, struct irq_desc *desc); 281extern void fastcall handle_percpu_irq(unsigned int irq, struct irq_desc *desc); 282extern void fastcall handle_bad_irq(unsigned int irq, struct irq_desc *desc); 283 284/* 285 * Monolithic do_IRQ implementation. 286 * (is an explicit fastcall, because i386 4KSTACKS calls it from assembly) 287 */ 288#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 289extern fastcall unsigned int __do_IRQ(unsigned int irq); 290#endif 291 292/* 293 * Architectures call this to let the generic IRQ layer 294 * handle an interrupt. If the descriptor is attached to an 295 * irqchip-style controller then we call the ->handle_irq() handler, 296 * and it calls __do_IRQ() if it's attached to an irqtype-style controller. 297 */ 298static inline void generic_handle_irq(unsigned int irq) 299{ 300 struct irq_desc *desc = irq_desc + irq; 301 302#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ 303 desc->handle_irq(irq, desc); 304#else 305 if (likely(desc->handle_irq)) 306 desc->handle_irq(irq, desc); 307 else 308 __do_IRQ(irq); 309#endif 310} 311 312/* Handling of unhandled and spurious interrupts: */ 313extern void note_interrupt(unsigned int irq, struct irq_desc *desc, 314 int action_ret); 315 316/* Resending of interrupts :*/ 317void check_irq_resend(struct irq_desc *desc, unsigned int irq); 318 319/* Enable/disable irq debugging output: */ 320extern int noirqdebug_setup(char *str); 321 322/* Checks whether the interrupt can be requested by request_irq(): */ 323extern int can_request_irq(unsigned int irq, unsigned long irqflags); 324 325/* Dummy irq-chip implementations: */ 326extern struct irq_chip no_irq_chip; 327extern struct irq_chip dummy_irq_chip; 328 329extern void 330set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, 331 irq_flow_handler_t handle); 332extern void 333set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, 334 irq_flow_handler_t handle, const char *name); 335 336extern void 337__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, 338 const char *name); 339 340/* 341 * Set a highlevel flow handler for a given IRQ: 342 */ 343static inline void 344set_irq_handler(unsigned int irq, irq_flow_handler_t handle) 345{ 346 __set_irq_handler(irq, handle, 0, NULL); 347} 348 349/* 350 * Set a highlevel chained flow handler for a given IRQ. 351 * (a chained handler is automatically enabled and set to 352 * IRQ_NOREQUEST and IRQ_NOPROBE) 353 */ 354static inline void 355set_irq_chained_handler(unsigned int irq, 356 irq_flow_handler_t handle) 357{ 358 __set_irq_handler(irq, handle, 1, NULL); 359} 360 361/* Handle dynamic irq creation and destruction */ 362extern int create_irq(void); 363extern void destroy_irq(unsigned int irq); 364 365/* Test to see if a driver has successfully requested an irq */ 366static inline int irq_has_action(unsigned int irq) 367{ 368 struct irq_desc *desc = irq_desc + irq; 369 return desc->action != NULL; 370} 371 372/* Dynamic irq helper functions */ 373extern void dynamic_irq_init(unsigned int irq); 374extern void dynamic_irq_cleanup(unsigned int irq); 375 376/* Set/get chip/data for an IRQ: */ 377extern int set_irq_chip(unsigned int irq, struct irq_chip *chip); 378extern int set_irq_data(unsigned int irq, void *data); 379extern int set_irq_chip_data(unsigned int irq, void *data); 380extern int set_irq_type(unsigned int irq, unsigned int type); 381extern int set_irq_msi(unsigned int irq, struct msi_desc *entry); 382 383#define get_irq_chip(irq) (irq_desc[irq].chip) 384#define get_irq_chip_data(irq) (irq_desc[irq].chip_data) 385#define get_irq_data(irq) (irq_desc[irq].handler_data) 386#define get_irq_msi(irq) (irq_desc[irq].msi_desc) 387 388#endif /* CONFIG_GENERIC_HARDIRQS */ 389 390#endif /* !CONFIG_S390 */ 391 392#endif /* _LINUX_IRQ_H */ 393