LXR linux/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#include <linux/dma-mapping.h>
  15
  16struct airq_struct {
  17        struct hlist_node list;         /* Handler queueing. */
  18        void (*handler)(struct airq_struct *airq, bool floating);
  19        u8 *lsi_ptr;                    /* Local-Summary-Indicator pointer */
  20        u8 lsi_mask;                    /* Local-Summary-Indicator mask */
  21        u8 isc;                         /* Interrupt-subclass */
  22        u8 flags;
  23};
  24
  25#define AIRQ_PTR_ALLOCATED      0x01
  26
  27int register_adapter_interrupt(struct airq_struct *airq);
  28void unregister_adapter_interrupt(struct airq_struct *airq);
  29
  30/* Adapter interrupt bit vector */
  31struct airq_iv {
  32        unsigned long *vector;  /* Adapter interrupt bit vector */
  33        dma_addr_t vector_dma; /* Adapter interrupt bit vector dma */
  34        unsigned long *avail;   /* Allocation bit mask for the bit vector */
  35        unsigned long *bitlock; /* Lock bit mask for the bit vector */
  36        unsigned long *ptr;     /* Pointer associated with each bit */
  37        unsigned int *data;     /* 32 bit value associated with each bit */
  38        unsigned long bits;     /* Number of bits in the vector */
  39        unsigned long end;      /* Number of highest allocated bit + 1 */
  40        unsigned long flags;    /* Allocation flags */
  41        spinlock_t lock;        /* Lock to protect alloc & free */
  42};
  43
  44#define AIRQ_IV_ALLOC           1       /* Use an allocation bit mask */
  45#define AIRQ_IV_BITLOCK         2       /* Allocate the lock bit mask */
  46#define AIRQ_IV_PTR             4       /* Allocate the ptr array */
  47#define AIRQ_IV_DATA            8       /* Allocate the data array */
  48#define AIRQ_IV_CACHELINE       16      /* Cacheline alignment for the vector */
  49
  50struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
  51void airq_iv_release(struct airq_iv *iv);
  52unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
  53void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
  54unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
  55                           unsigned long end);
  56
  57static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
  58{
  59        return airq_iv_alloc(iv, 1);
  60}
  61
  62static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
  63{
  64        airq_iv_free(iv, bit, 1);
  65}
  66
  67static inline unsigned long airq_iv_end(struct airq_iv *iv)
  68{
  69        return iv->end;
  70}
  71
  72static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
  73{
  74        const unsigned long be_to_le = BITS_PER_LONG - 1;
  75        bit_spin_lock(bit ^ be_to_le, iv->bitlock);
  76}
  77
  78static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
  79{
  80        const unsigned long be_to_le = BITS_PER_LONG - 1;
  81        bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
  82}
  83
  84static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
  85                                    unsigned int data)
  86{
  87        iv->data[bit] = data;
  88}
  89
  90static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
  91                                            unsigned long bit)
  92{
  93        return iv->data[bit];
  94}
  95
  96static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
  97                                   unsigned long ptr)
  98{
  99        iv->ptr[bit] = ptr;
 100}
 101
 102static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
 103                                            unsigned long bit)
 104{
 105        return iv->ptr[bit];
 106}
 107
 108#endif /* _ASM_S390_AIRQ_H */
 109