arch/s390/include/asm/airq.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *    Copyright IBM Corp. 2002, 2007
   4  *    Author(s): Ingo Adlung <adlung@de.ibm.com>
   5  *               Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *               Arnd Bergmann <arndb@de.ibm.com>
   7  *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   8  */
   9
  10 #ifndef _ASM_S390_AIRQ_H
  11 #define _ASM_S390_AIRQ_H
  12
  13 #include <linux/bit_spinlock.h>
  14
  15 struct airq_struct {
  16         struct hlist_node list;         /* Handler queueing. */
  17         void (*handler)(struct airq_struct *airq, bool floating);
  18         u8 *lsi_ptr;                    /* Local-Summary-Indicator pointer */
  19         u8 lsi_mask;                    /* Local-Summary-Indicator mask */
  20         u8 isc;                         /* Interrupt-subclass */
  21         u8 flags;
  22 };
  23
  24 #define AIRQ_PTR_ALLOCATED      0x01
  25
  26 int register_adapter_interrupt(struct airq_struct *airq);
  27 void unregister_adapter_interrupt(struct airq_struct *airq);
  28
  29 /* Adapter interrupt bit vector */
  30 struct airq_iv {
  31         unsigned long *vector;  /* Adapter interrupt bit vector */
  32         unsigned long *avail;   /* Allocation bit mask for the bit vector */
  33         unsigned long *bitlock; /* Lock bit mask for the bit vector */
  34         unsigned long *ptr;     /* Pointer associated with each bit */
  35         unsigned int *data;     /* 32 bit value associated with each bit */
  36         unsigned long bits;     /* Number of bits in the vector */
  37         unsigned long end;      /* Number of highest allocated bit + 1 */
  38         unsigned long flags;    /* Allocation flags */
  39         spinlock_t lock;        /* Lock to protect alloc & free */
  40 };
  41
  42 #define AIRQ_IV_ALLOC           1       /* Use an allocation bit mask */
  43 #define AIRQ_IV_BITLOCK         2       /* Allocate the lock bit mask */
  44 #define AIRQ_IV_PTR             4       /* Allocate the ptr array */
  45 #define AIRQ_IV_DATA            8       /* Allocate the data array */
  46 #define AIRQ_IV_CACHELINE       16      /* Cacheline alignment for the vector */
  47
  48 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
  49 void airq_iv_release(struct airq_iv *iv);
  50 unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
  51 void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
  52 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
  53                            unsigned long end);
  54
  55 static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
  56 {
  57         return airq_iv_alloc(iv, 1);
  58 }
  59
  60 static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
  61 {
  62         airq_iv_free(iv, bit, 1);
  63 }
  64
  65 static inline unsigned long airq_iv_end(struct airq_iv *iv)
  66 {
  67         return iv->end;
  68 }
  69
  70 static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
  71 {
  72         const unsigned long be_to_le = BITS_PER_LONG - 1;
  73         bit_spin_lock(bit ^ be_to_le, iv->bitlock);
  74 }
  75
  76 static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
  77 {
  78         const unsigned long be_to_le = BITS_PER_LONG - 1;
  79         bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
  80 }
  81
  82 static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
  83                                     unsigned int data)
  84 {
  85         iv->data[bit] = data;
  86 }
  87
  88 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
  89                                             unsigned long bit)
  90 {
  91         return iv->data[bit];
  92 }
  93
  94 static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
  95                                    unsigned long ptr)
  96 {
  97         iv->ptr[bit] = ptr;
  98 }
  99
 100 static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
 101                                             unsigned long bit)
 102 {
 103         return iv->ptr[bit];
 104 }
 105
 106 #endif /* _ASM_S390_AIRQ_H */