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1 /*
2  *    Copyright IBM Corp. 2002, 2007
3  *    Author(s): Ingo Adlung <adlung@de.ibm.com>
4  *		 Cornelia Huck <cornelia.huck@de.ibm.com>
5  *		 Arnd Bergmann <arndb@de.ibm.com>
6  *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
7  */
8 
9 #ifndef _ASM_S390_AIRQ_H
10 #define _ASM_S390_AIRQ_H
11 
12 #include <linux/bit_spinlock.h>
13 
14 struct airq_struct {
15 	struct hlist_node list;		/* Handler queueing. */
16 	void (*handler)(struct airq_struct *);	/* Thin-interrupt handler */
17 	u8 *lsi_ptr;			/* Local-Summary-Indicator pointer */
18 	u8 lsi_mask;			/* Local-Summary-Indicator mask */
19 	u8 isc;				/* Interrupt-subclass */
20 	u8 flags;
21 };
22 
23 #define AIRQ_PTR_ALLOCATED	0x01
24 
25 int register_adapter_interrupt(struct airq_struct *airq);
26 void unregister_adapter_interrupt(struct airq_struct *airq);
27 
28 /* Adapter interrupt bit vector */
29 struct airq_iv {
30 	unsigned long *vector;	/* Adapter interrupt bit vector */
31 	unsigned long *avail;	/* Allocation bit mask for the bit vector */
32 	unsigned long *bitlock;	/* Lock bit mask for the bit vector */
33 	unsigned long *ptr;	/* Pointer associated with each bit */
34 	unsigned int *data;	/* 32 bit value associated with each bit */
35 	unsigned long bits;	/* Number of bits in the vector */
36 	unsigned long end;	/* Number of highest allocated bit + 1 */
37 	spinlock_t lock;	/* Lock to protect alloc & free */
38 };
39 
40 #define AIRQ_IV_ALLOC	1	/* Use an allocation bit mask */
41 #define AIRQ_IV_BITLOCK	2	/* Allocate the lock bit mask */
42 #define AIRQ_IV_PTR	4	/* Allocate the ptr array */
43 #define AIRQ_IV_DATA	8	/* Allocate the data array */
44 
45 struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags);
46 void airq_iv_release(struct airq_iv *iv);
47 unsigned long airq_iv_alloc(struct airq_iv *iv, unsigned long num);
48 void airq_iv_free(struct airq_iv *iv, unsigned long bit, unsigned long num);
49 unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
50 			   unsigned long end);
51 
airq_iv_alloc_bit(struct airq_iv * iv)52 static inline unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
53 {
54 	return airq_iv_alloc(iv, 1);
55 }
56 
airq_iv_free_bit(struct airq_iv * iv,unsigned long bit)57 static inline void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
58 {
59 	airq_iv_free(iv, bit, 1);
60 }
61 
airq_iv_end(struct airq_iv * iv)62 static inline unsigned long airq_iv_end(struct airq_iv *iv)
63 {
64 	return iv->end;
65 }
66 
airq_iv_lock(struct airq_iv * iv,unsigned long bit)67 static inline void airq_iv_lock(struct airq_iv *iv, unsigned long bit)
68 {
69 	const unsigned long be_to_le = BITS_PER_LONG - 1;
70 	bit_spin_lock(bit ^ be_to_le, iv->bitlock);
71 }
72 
airq_iv_unlock(struct airq_iv * iv,unsigned long bit)73 static inline void airq_iv_unlock(struct airq_iv *iv, unsigned long bit)
74 {
75 	const unsigned long be_to_le = BITS_PER_LONG - 1;
76 	bit_spin_unlock(bit ^ be_to_le, iv->bitlock);
77 }
78 
airq_iv_set_data(struct airq_iv * iv,unsigned long bit,unsigned int data)79 static inline void airq_iv_set_data(struct airq_iv *iv, unsigned long bit,
80 				    unsigned int data)
81 {
82 	iv->data[bit] = data;
83 }
84 
airq_iv_get_data(struct airq_iv * iv,unsigned long bit)85 static inline unsigned int airq_iv_get_data(struct airq_iv *iv,
86 					    unsigned long bit)
87 {
88 	return iv->data[bit];
89 }
90 
airq_iv_set_ptr(struct airq_iv * iv,unsigned long bit,unsigned long ptr)91 static inline void airq_iv_set_ptr(struct airq_iv *iv, unsigned long bit,
92 				   unsigned long ptr)
93 {
94 	iv->ptr[bit] = ptr;
95 }
96 
airq_iv_get_ptr(struct airq_iv * iv,unsigned long bit)97 static inline unsigned long airq_iv_get_ptr(struct airq_iv *iv,
98 					    unsigned long bit)
99 {
100 	return iv->ptr[bit];
101 }
102 
103 #endif /* _ASM_S390_AIRQ_H */
104