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#include <asm/tpi.h>
 16
 17struct airq_struct {
 18	struct hlist_node list;		/* Handler queueing. */
 19	void (*handler)(struct airq_struct *airq, struct tpi_info *tpi_info);
 20	u8 *lsi_ptr;			/* Local-Summary-Indicator pointer */
 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#define AIRQ_IV_GUESTVEC	32	/* Vector is a pinned guest page */
 50
 51struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,
 52			       unsigned long *vec);
 53void airq_iv_release(struct airq_iv *iv);
 54unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
 55void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
 56unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
 57			   unsigned long end);
 58
 59static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
 60{
 61	return airq_iv_alloc(iv, 1);
 62}
 63
 64static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
 65{
 66	airq_iv_free(iv, bit, 1);
 67}
 68
 69static inline unsigned long airq_iv_end(struct airq_iv *iv)
 70{
 71	return iv->end;
 72}
 73
 74static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
 75{
 76	const unsigned long be_to_le = BITS_PER_LONG - 1;
 77	bit_spin_lock(bit ^ be_to_le, iv->bitlock);
 78}
 79
 80static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
 81{
 82	const unsigned long be_to_le = BITS_PER_LONG - 1;
 83	bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
 84}
 85
 86static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
 87				    unsigned int data)
 88{
 89	iv->data[bit] = data;
 90}
 91
 92static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
 93					    unsigned long bit)
 94{
 95	return iv->data[bit];
 96}
 97
 98static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
 99				   unsigned long ptr)
100{
101	iv->ptr[bit] = ptr;
102}
103
104static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
105					    unsigned long bit)
106{
107	return iv->ptr[bit];
108}
109
110#endif /* _ASM_S390_AIRQ_H */