LXR linux/arch/s390/include/asm/airq.h

   1/*
   2 *    Copyright IBM Corp. 2002, 2007
   3 *    Author(s): Ingo Adlung <adlung@de.ibm.com>
   4 *               Cornelia Huck <cornelia.huck@de.ibm.com>
   5 *               Arnd Bergmann <arndb@de.ibm.com>
   6 *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   7 */
   8
   9#ifndef _ASM_S390_AIRQ_H
  10#define _ASM_S390_AIRQ_H
  11
  12#include <linux/bit_spinlock.h>
  13
  14struct airq_struct {
  15        struct hlist_node list;         /* Handler queueing. */
  16        void (*handler)(struct airq_struct *);  /* Thin-interrupt handler */
  17        u8 *lsi_ptr;                    /* Local-Summary-Indicator pointer */
  18        u8 lsi_mask;                    /* Local-Summary-Indicator mask */
  19        u8 isc;                         /* Interrupt-subclass */
  20        u8 flags;
  21};
  22
  23#define AIRQ_PTR_ALLOCATED      0x01
  24
  25int register_adapter_interrupt(struct airq_struct *airq);
  26void unregister_adapter_interrupt(struct airq_struct *airq);
  27
  28/* Adapter interrupt bit vector */
  29struct airq_iv {
  30        unsigned long *vector;  /* Adapter interrupt bit vector */
  31        unsigned long *avail;   /* Allocation bit mask for the bit vector */
  32        unsigned long *bitlock; /* Lock bit mask for the bit vector */
  33        unsigned long *ptr;     /* Pointer associated with each bit */
  34        unsigned int *data;     /* 32 bit value associated with each bit */
  35        unsigned long bits;     /* Number of bits in the vector */
  36        unsigned long end;      /* Number of highest allocated bit + 1 */
  37        spinlock_t lock;        /* Lock to protect alloc & free */
  38};
  39
  40#define AIRQ_IV_ALLOC   1       /* Use an allocation bit mask */
  41#define AIRQ_IV_BITLOCK 2       /* Allocate the lock bit mask */
  42#define AIRQ_IV_PTR     4       /* Allocate the ptr array */
  43#define AIRQ_IV_DATA    8       /* Allocate the data array */
  44
  45struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
  46void airq_iv_release(struct airq_iv *iv);
  47unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
  48void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
  49unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
  50                           unsigned long end);
  51
  52static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
  53{
  54        return airq_iv_alloc(iv, 1);
  55}
  56
  57static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
  58{
  59        airq_iv_free(iv, bit, 1);
  60}
  61
  62static inline unsigned long airq_iv_end(struct airq_iv *iv)
  63{
  64        return iv->end;
  65}
  66
  67static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
  68{
  69        const unsigned long be_to_le = BITS_PER_LONG - 1;
  70        bit_spin_lock(bit ^ be_to_le, iv->bitlock);
  71}
  72
  73static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
  74{
  75        const unsigned long be_to_le = BITS_PER_LONG - 1;
  76        bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
  77}
  78
  79static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
  80                                    unsigned int data)
  81{
  82        iv->data[bit] = data;
  83}
  84
  85static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
  86                                            unsigned long bit)
  87{
  88        return iv->data[bit];
  89}
  90
  91static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
  92                                   unsigned long ptr)
  93{
  94        iv->ptr[bit] = ptr;
  95}
  96
  97static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
  98                                            unsigned long bit)
  99{
 100        return iv->ptr[bit];
 101}
 102
 103#endif /* _ASM_S390_AIRQ_H */
 104