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 lsi_mask; /* Local-Summary-Indicator mask */
22 u8 isc; /* Interrupt-subclass */
23 u8 flags;
24 };
25
26 #define AIRQ_PTR_ALLOCATED 0x01
27
28 int register_adapter_interrupt(struct airq_struct *airq);
29 void unregister_adapter_interrupt(struct airq_struct *airq);
30
31 /* Adapter interrupt bit vector */
32 struct airq_iv {
33 unsigned long *vector; /* Adapter interrupt bit vector */
34 dma_addr_t vector_dma; /* Adapter interrupt bit vector dma */
35 unsigned long *avail; /* Allocation bit mask for the bit vector */
36 unsigned long *bitlock; /* Lock bit mask for the bit vector */
37 unsigned long *ptr; /* Pointer associated with each bit */
38 unsigned int *data; /* 32 bit value associated with each bit */
39 unsigned long bits; /* Number of bits in the vector */
40 unsigned long end; /* Number of highest allocated bit + 1 */
41 unsigned long flags; /* Allocation flags */
42 spinlock_t lock; /* Lock to protect alloc & free */
43 };
44
45 #define AIRQ_IV_ALLOC 1 /* Use an allocation bit mask */
46 #define AIRQ_IV_BITLOCK 2 /* Allocate the lock bit mask */
47 #define AIRQ_IV_PTR 4 /* Allocate the ptr array */
48 #define AIRQ_IV_DATA 8 /* Allocate the data array */
49 #define AIRQ_IV_CACHELINE 16 /* Cacheline alignment for the vector */
50 #define AIRQ_IV_GUESTVEC 32 /* Vector is a pinned guest page */
51
52 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags,
53 unsigned long *vec);
54 void airq_iv_release(struct airq_iv *iv);
55 unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
56 void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
57 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
58 unsigned long end);
59
airq_iv_alloc_bit(struct airq_iv * iv)60 static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
61 {
62 return airq_iv_alloc(iv, 1);
63 }
64
airq_iv_free_bit(struct airq_iv * iv,unsigned long bit)65 static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
66 {
67 airq_iv_free(iv, bit, 1);
68 }
69
airq_iv_end(struct airq_iv * iv)70 static inline unsigned long airq_iv_end(struct airq_iv *iv)
71 {
72 return iv->end;
73 }
74
airq_iv_lock(struct airq_iv * iv,unsigned long bit)75 static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
76 {
77 const unsigned long be_to_le = BITS_PER_LONG - 1;
78 bit_spin_lock(bit ^ be_to_le, iv->bitlock);
79 }
80
airq_iv_unlock(struct airq_iv * iv,unsigned long bit)81 static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
82 {
83 const unsigned long be_to_le = BITS_PER_LONG - 1;
84 bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
85 }
86
airq_iv_set_data(struct airq_iv * iv,unsigned long bit,unsigned int data)87 static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
88 unsigned int data)
89 {
90 iv->data[bit] = data;
91 }
92
airq_iv_get_data(struct airq_iv * iv,unsigned long bit)93 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
94 unsigned long bit)
95 {
96 return iv->data[bit];
97 }
98
airq_iv_set_ptr(struct airq_iv * iv,unsigned long bit,unsigned long ptr)99 static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
100 unsigned long ptr)
101 {
102 iv->ptr[bit] = ptr;
103 }
104
airq_iv_get_ptr(struct airq_iv * iv,unsigned long bit)105 static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
106 unsigned long bit)
107 {
108 return iv->ptr[bit];
109 }
110
111 #endif /* _ASM_S390_AIRQ_H */
112