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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _X86_POSTED_INTR_H
3#define _X86_POSTED_INTR_H
4#include <asm/irq_vectors.h>
5
6#define POSTED_INTR_ON 0
7#define POSTED_INTR_SN 1
8
9#define PID_TABLE_ENTRY_VALID 1
10
11/* Posted-Interrupt Descriptor */
12struct pi_desc {
13 union {
14 u32 pir[8]; /* Posted interrupt requested */
15 u64 pir64[4];
16 };
17 union {
18 struct {
19 u16 notifications; /* Suppress and outstanding bits */
20 u8 nv;
21 u8 rsvd_2;
22 u32 ndst;
23 };
24 u64 control;
25 };
26 u32 rsvd[6];
27} __aligned(64);
28
29static inline bool pi_test_and_set_on(struct pi_desc *pi_desc)
30{
31 return test_and_set_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
32}
33
34static inline bool pi_test_and_clear_on(struct pi_desc *pi_desc)
35{
36 return test_and_clear_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
37}
38
39static inline bool pi_test_and_clear_sn(struct pi_desc *pi_desc)
40{
41 return test_and_clear_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
42}
43
44static inline bool pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
45{
46 return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
47}
48
49static inline bool pi_is_pir_empty(struct pi_desc *pi_desc)
50{
51 return bitmap_empty((unsigned long *)pi_desc->pir, NR_VECTORS);
52}
53
54static inline void pi_set_sn(struct pi_desc *pi_desc)
55{
56 set_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
57}
58
59static inline void pi_set_on(struct pi_desc *pi_desc)
60{
61 set_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
62}
63
64static inline void pi_clear_on(struct pi_desc *pi_desc)
65{
66 clear_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
67}
68
69static inline void pi_clear_sn(struct pi_desc *pi_desc)
70{
71 clear_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
72}
73
74static inline bool pi_test_on(struct pi_desc *pi_desc)
75{
76 return test_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
77}
78
79static inline bool pi_test_sn(struct pi_desc *pi_desc)
80{
81 return test_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
82}
83
84/* Non-atomic helpers */
85static inline void __pi_set_sn(struct pi_desc *pi_desc)
86{
87 pi_desc->notifications |= BIT(POSTED_INTR_SN);
88}
89
90static inline void __pi_clear_sn(struct pi_desc *pi_desc)
91{
92 pi_desc->notifications &= ~BIT(POSTED_INTR_SN);
93}
94
95#ifdef CONFIG_X86_POSTED_MSI
96/*
97 * Not all external vectors are subject to interrupt remapping, e.g. IOMMU's
98 * own interrupts. Here we do not distinguish them since those vector bits in
99 * PIR will always be zero.
100 */
101static inline bool pi_pending_this_cpu(unsigned int vector)
102{
103 struct pi_desc *pid = this_cpu_ptr(&posted_msi_pi_desc);
104
105 if (WARN_ON_ONCE(vector > NR_VECTORS || vector < FIRST_EXTERNAL_VECTOR))
106 return false;
107
108 return test_bit(vector, (unsigned long *)pid->pir);
109}
110
111extern void intel_posted_msi_init(void);
112#else
113static inline bool pi_pending_this_cpu(unsigned int vector) { return false; }
114
115static inline void intel_posted_msi_init(void) {};
116#endif /* X86_POSTED_MSI */
117
118#endif /* _X86_POSTED_INTR_H */