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
  14 struct 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
  25 int register_adapter_interrupt(struct airq_struct *airq);
  26 void unregister_adapter_interrupt(struct airq_struct *airq);
  27
  28 /* Adapter interrupt bit vector */
  29 struct 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
  45 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
  46 void airq_iv_release(struct airq_iv *iv);
  47 unsigned long airq_iv_alloc_bit(struct airq_iv *iv);
  48 void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit);
  49 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
  50                            unsigned long end);
  51
  52 static inline unsigned long airq_iv_end(struct airq_iv *iv)
  53 {
  54         return iv->end;
  55 }
  56
  57 static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
  58 {
  59         const unsigned long be_to_le = BITS_PER_LONG - 1;
  60         bit_spin_lock(bit ^ be_to_le, iv->bitlock);
  61 }
  62
  63 static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
  64 {
  65         const unsigned long be_to_le = BITS_PER_LONG - 1;
  66         bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
  67 }
  68
  69 static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
  70                                     unsigned int data)
  71 {
  72         iv->data[bit] = data;
  73 }
  74
  75 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
  76                                             unsigned long bit)
  77 {
  78         return iv->data[bit];
  79 }
  80
  81 static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
  82                                    unsigned long ptr)
  83 {
  84         iv->ptr[bit] = ptr;
  85 }
  86
  87 static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
  88                                             unsigned long bit)
  89 {
  90         return iv->ptr[bit];
  91 }
  92
  93 #endif /* _ASM_S390_AIRQ_H */