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 */
111