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 
16 struct 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 
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 
50 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
51 void airq_iv_release(struct airq_iv *iv);
52 unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
53 void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
54 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
55 			   unsigned long end);
56 
airq_iv_alloc_bit(struct airq_iv * iv)57 static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
58 {
59 	return airq_iv_alloc(iv, 1);
60 }
61 
airq_iv_free_bit(struct airq_iv * iv,unsigned long bit)62 static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
63 {
64 	airq_iv_free(iv, bit, 1);
65 }
66 
airq_iv_end(struct airq_iv * iv)67 static inline unsigned long airq_iv_end(struct airq_iv *iv)
68 {
69 	return iv->end;
70 }
71 
airq_iv_lock(struct airq_iv * iv,unsigned long bit)72 static 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 
airq_iv_unlock(struct airq_iv * iv,unsigned long bit)78 static 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 
airq_iv_set_data(struct airq_iv * iv,unsigned long bit,unsigned int data)84 static 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 
airq_iv_get_data(struct airq_iv * iv,unsigned long bit)90 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
91 					    unsigned long bit)
92 {
93 	return iv->data[bit];
94 }
95 
airq_iv_set_ptr(struct airq_iv * iv,unsigned long bit,unsigned long ptr)96 static 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 
airq_iv_get_ptr(struct airq_iv * iv,unsigned long bit)102 static 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