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
17 struct 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
27 int register_adapter_interrupt(struct airq_struct *airq);
28 void unregister_adapter_interrupt(struct airq_struct *airq);
29
30 /* Adapter interrupt bit vector */
31 struct 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
51 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,
52 unsigned long *vec);
53 void airq_iv_release(struct airq_iv *iv);
54 unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
55 void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
56 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
57 unsigned long end);
58
59 static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
60 {
61 return airq_iv_alloc(iv, 1);
62 }
63
64 static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
65 {
66 airq_iv_free(iv, bit, 1);
67 }
68
69 static inline unsigned long airq_iv_end(struct airq_iv *iv)
70 {
71 return iv->end;
72 }
73
74 static 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
80 static 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
86 static 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
92 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
93 unsigned long bit)
94 {
95 return iv->data[bit];
96 }
97
98 static 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
104 static 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
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