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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 | ||
d9109698 JL |
16 | /* Temparory solution for building, will be removed later */ |
17 | #include <linux/pci.h> | |
18 | ||
f3cf8bb0 JL |
19 | #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN |
20 | /** | |
21 | * msi_domain_set_affinity - Generic affinity setter function for MSI domains | |
22 | * @irq_data: The irq data associated to the interrupt | |
23 | * @mask: The affinity mask to set | |
24 | * @force: Flag to enforce setting (disable online checks) | |
25 | * | |
26 | * Intended to be used by MSI interrupt controllers which are | |
27 | * implemented with hierarchical domains. | |
28 | */ | |
29 | int msi_domain_set_affinity(struct irq_data *irq_data, | |
30 | const struct cpumask *mask, bool force) | |
31 | { | |
32 | struct irq_data *parent = irq_data->parent_data; | |
33 | struct msi_msg msg; | |
34 | int ret; | |
35 | ||
36 | ret = parent->chip->irq_set_affinity(parent, mask, force); | |
37 | if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) { | |
38 | BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | |
39 | irq_chip_write_msi_msg(irq_data, &msg); | |
40 | } | |
41 | ||
42 | return ret; | |
43 | } | |
44 | ||
45 | static void msi_domain_activate(struct irq_domain *domain, | |
46 | struct irq_data *irq_data) | |
47 | { | |
48 | struct msi_msg msg; | |
49 | ||
50 | BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg)); | |
51 | irq_chip_write_msi_msg(irq_data, &msg); | |
52 | } | |
53 | ||
54 | static void msi_domain_deactivate(struct irq_domain *domain, | |
55 | struct irq_data *irq_data) | |
56 | { | |
57 | struct msi_msg msg; | |
58 | ||
59 | memset(&msg, 0, sizeof(msg)); | |
60 | irq_chip_write_msi_msg(irq_data, &msg); | |
61 | } | |
62 | ||
63 | static int msi_domain_alloc(struct irq_domain *domain, unsigned int virq, | |
64 | unsigned int nr_irqs, void *arg) | |
65 | { | |
66 | struct msi_domain_info *info = domain->host_data; | |
67 | struct msi_domain_ops *ops = info->ops; | |
68 | irq_hw_number_t hwirq = ops->get_hwirq(info, arg); | |
69 | int i, ret; | |
70 | ||
71 | if (irq_find_mapping(domain, hwirq) > 0) | |
72 | return -EEXIST; | |
73 | ||
74 | ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg); | |
75 | if (ret < 0) | |
76 | return ret; | |
77 | ||
78 | for (i = 0; i < nr_irqs; i++) { | |
79 | ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg); | |
80 | if (ret < 0) { | |
81 | if (ops->msi_free) { | |
82 | for (i--; i > 0; i--) | |
83 | ops->msi_free(domain, info, virq + i); | |
84 | } | |
85 | irq_domain_free_irqs_top(domain, virq, nr_irqs); | |
86 | return ret; | |
87 | } | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static void msi_domain_free(struct irq_domain *domain, unsigned int virq, | |
94 | unsigned int nr_irqs) | |
95 | { | |
96 | struct msi_domain_info *info = domain->host_data; | |
97 | int i; | |
98 | ||
99 | if (info->ops->msi_free) { | |
100 | for (i = 0; i < nr_irqs; i++) | |
101 | info->ops->msi_free(domain, info, virq + i); | |
102 | } | |
103 | irq_domain_free_irqs_top(domain, virq, nr_irqs); | |
104 | } | |
105 | ||
106 | static struct irq_domain_ops msi_domain_ops = { | |
107 | .alloc = msi_domain_alloc, | |
108 | .free = msi_domain_free, | |
109 | .activate = msi_domain_activate, | |
110 | .deactivate = msi_domain_deactivate, | |
111 | }; | |
112 | ||
113 | /** | |
114 | * msi_create_irq_domain - Create a MSI interrupt domain | |
115 | * @of_node: Optional device-tree node of the interrupt controller | |
116 | * @info: MSI domain info | |
117 | * @parent: Parent irq domain | |
118 | */ | |
119 | struct irq_domain *msi_create_irq_domain(struct device_node *of_node, | |
120 | struct msi_domain_info *info, | |
121 | struct irq_domain *parent) | |
122 | { | |
123 | struct irq_domain *domain; | |
124 | ||
125 | domain = irq_domain_add_tree(of_node, &msi_domain_ops, info); | |
126 | if (domain) | |
127 | domain->parent = parent; | |
128 | ||
129 | return domain; | |
130 | } | |
131 | ||
d9109698 JL |
132 | /** |
133 | * msi_domain_alloc_irqs - Allocate interrupts from a MSI interrupt domain | |
134 | * @domain: The domain to allocate from | |
135 | * @dev: Pointer to device struct of the device for which the interrupts | |
136 | * are allocated | |
137 | * @nvec: The number of interrupts to allocate | |
138 | * | |
139 | * Returns 0 on success or an error code. | |
140 | */ | |
141 | int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, | |
142 | int nvec) | |
143 | { | |
144 | struct msi_domain_info *info = domain->host_data; | |
145 | struct msi_domain_ops *ops = info->ops; | |
146 | msi_alloc_info_t arg; | |
147 | struct msi_desc *desc; | |
148 | int i, ret, virq = -1; | |
149 | ||
150 | ret = ops->msi_check(domain, info, dev); | |
151 | if (ret == 0) | |
152 | ret = ops->msi_prepare(domain, dev, nvec, &arg); | |
153 | if (ret) | |
154 | return ret; | |
155 | ||
156 | for_each_msi_entry(desc, dev) { | |
157 | ops->set_desc(&arg, desc); | |
158 | ||
159 | virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used, | |
160 | dev_to_node(dev), &arg, false); | |
161 | if (virq < 0) { | |
162 | ret = -ENOSPC; | |
163 | if (ops->handle_error) | |
164 | ret = ops->handle_error(domain, desc, ret); | |
165 | if (ops->msi_finish) | |
166 | ops->msi_finish(&arg, ret); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | for (i = 0; i < desc->nvec_used; i++) | |
171 | irq_set_msi_desc_off(virq, i, desc); | |
172 | } | |
173 | ||
174 | if (ops->msi_finish) | |
175 | ops->msi_finish(&arg, 0); | |
176 | ||
177 | for_each_msi_entry(desc, dev) { | |
178 | if (desc->nvec_used == 1) | |
179 | dev_dbg(dev, "irq %d for MSI\n", virq); | |
180 | else | |
181 | dev_dbg(dev, "irq [%d-%d] for MSI\n", | |
182 | virq, virq + desc->nvec_used - 1); | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | /** | |
189 | * msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated tp @dev | |
190 | * @domain: The domain to managing the interrupts | |
191 | * @dev: Pointer to device struct of the device for which the interrupts | |
192 | * are free | |
193 | */ | |
194 | void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev) | |
195 | { | |
196 | struct msi_desc *desc; | |
197 | ||
198 | for_each_msi_entry(desc, dev) { | |
199 | irq_domain_free_irqs(desc->irq, desc->nvec_used); | |
200 | desc->irq = 0; | |
201 | } | |
202 | } | |
203 | ||
f3cf8bb0 JL |
204 | /** |
205 | * msi_get_domain_info - Get the MSI interrupt domain info for @domain | |
206 | * @domain: The interrupt domain to retrieve data from | |
207 | * | |
208 | * Returns the pointer to the msi_domain_info stored in | |
209 | * @domain->host_data. | |
210 | */ | |
211 | struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain) | |
212 | { | |
213 | return (struct msi_domain_info *)domain->host_data; | |
214 | } | |
215 | ||
216 | #endif /* CONFIG_GENERIC_MSI_IRQ_DOMAIN */ |