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f3cf8bb0 JL |
1 | /* |
2 | * linux/kernel/irq/msi.c | |
3 | * | |
4 | * Copyright (C) 2014 Intel Corp. | |
5 | * Author: Jiang Liu <jiang.liu@linux.intel.com> | |
6 | * | |
7 | * This file is licensed under GPLv2. | |
8 | * | |
9 | * This file contains common code to support Message Signalled Interrupt for | |
10 | * PCI compatible and non PCI compatible devices. | |
11 | */ | |
12 | #include <linux/irq.h> | |
13 | #include <linux/irqdomain.h> | |
14 | #include <linux/msi.h> | |
15 | ||
16 | #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN | |
17 | /** | |
18 | * msi_domain_set_affinity - Generic affinity setter function for MSI domains | |
19 | * @irq_data: The irq data associated to the interrupt | |
20 | * @mask: The affinity mask to set | |
21 | * @force: Flag to enforce setting (disable online checks) | |
22 | * | |
23 | * Intended to be used by MSI interrupt controllers which are | |
24 | * implemented with hierarchical domains. | |
25 | */ | |
26 | int msi_domain_set_affinity(struct irq_data *irq_data, | |
27 | const struct cpumask *mask, bool force) | |
28 | { | |
29 | struct irq_data *parent = irq_data->parent_data; | |
30 | struct msi_msg msg; | |
31 | int ret; | |
32 | ||
33 | ret = parent->chip->irq_set_affinity(parent, mask, force); | |
34 | if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { | |
35 | BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | |
36 | irq_chip_write_msi_msg(irq_data, &msg); | |
37 | } | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | static void msi_domain_activate(struct irq_domain *domain, | |
43 | struct irq_data *irq_data) | |
44 | { | |
45 | struct msi_msg msg; | |
46 | ||
47 | BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | |
48 | irq_chip_write_msi_msg(irq_data, &msg); | |
49 | } | |
50 | ||
51 | static void msi_domain_deactivate(struct irq_domain *domain, | |
52 | struct irq_data *irq_data) | |
53 | { | |
54 | struct msi_msg msg; | |
55 | ||
56 | memset(&msg, 0, sizeof(msg)); | |
57 | irq_chip_write_msi_msg(irq_data, &msg); | |
58 | } | |
59 | ||
60 | static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, | |
61 | unsigned int nr_irqs, void *arg) | |
62 | { | |
63 | struct msi_domain_info *info = domain->host_data; | |
64 | struct msi_domain_ops *ops = info->ops; | |
65 | irq_hw_number_t hwirq = ops->get_hwirq(info, arg); | |
66 | int i, ret; | |
67 | ||
68 | if (irq_find_mapping(domain, hwirq) > 0) | |
69 | return -EEXIST; | |
70 | ||
71 | ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); | |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
75 | for (i = 0; i < nr_irqs; i++) { | |
76 | ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg); | |
77 | if (ret < 0) { | |
78 | if (ops->msi_free) { | |
79 | for (i--; i > 0; i--) | |
80 | ops->msi_free(domain, info, virq + i); | |
81 | } | |
82 | irq_domain_free_irqs_top(domain, virq, nr_irqs); | |
83 | return ret; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static void msi_domain_free(struct irq_domain *domain, unsigned int virq, | |
91 | unsigned int nr_irqs) | |
92 | { | |
93 | struct msi_domain_info *info = domain->host_data; | |
94 | int i; | |
95 | ||
96 | if (info->ops->msi_free) { | |
97 | for (i = 0; i < nr_irqs; i++) | |
98 | info->ops->msi_free(domain, info, virq + i); | |
99 | } | |
100 | irq_domain_free_irqs_top(domain, virq, nr_irqs); | |
101 | } | |
102 | ||
103 | static struct irq_domain_ops msi_domain_ops = { | |
104 | .alloc = msi_domain_alloc, | |
105 | .free = msi_domain_free, | |
106 | .activate = msi_domain_activate, | |
107 | .deactivate = msi_domain_deactivate, | |
108 | }; | |
109 | ||
110 | /** | |
111 | * msi_create_irq_domain - Create a MSI interrupt domain | |
112 | * @of_node: Optional device-tree node of the interrupt controller | |
113 | * @info: MSI domain info | |
114 | * @parent: Parent irq domain | |
115 | */ | |
116 | struct irq_domain *msi_create_irq_domain(struct device_node *of_node, | |
117 | struct msi_domain_info *info, | |
118 | struct irq_domain *parent) | |
119 | { | |
120 | struct irq_domain *domain; | |
121 | ||
122 | domain = irq_domain_add_tree(of_node, &msi_domain_ops, info); | |
123 | if (domain) | |
124 | domain->parent = parent; | |
125 | ||
126 | return domain; | |
127 | } | |
128 | ||
129 | /** | |
130 | * msi_get_domain_info - Get the MSI interrupt domain info for @domain | |
131 | * @domain: The interrupt domain to retrieve data from | |
132 | * | |
133 | * Returns the pointer to the msi_domain_info stored in | |
134 | * @domain->host_data. | |
135 | */ | |
136 | struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) | |
137 | { | |
138 | return (struct msi_domain_info *)domain->host_data; | |
139 | } | |
140 | ||
141 | #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ |