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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9e2c986c MZ |
2 | /* |
3 | * Copyright (C) 2016 ARM Limited, All Rights Reserved. | |
4 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
9e2c986c MZ |
5 | */ |
6 | ||
7 | #include <linux/bitops.h> | |
8 | #include <linux/interrupt.h> | |
9 | #include <linux/irqchip.h> | |
10 | #include <linux/irqchip/chained_irq.h> | |
11 | #include <linux/irqchip/irq-partition-percpu.h> | |
12 | #include <linux/irqdomain.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/slab.h> | |
15 | ||
16 | struct partition_desc { | |
17 | int nr_parts; | |
18 | struct partition_affinity *parts; | |
19 | struct irq_domain *domain; | |
20 | struct irq_desc *chained_desc; | |
21 | unsigned long *bitmap; | |
22 | struct irq_domain_ops ops; | |
23 | }; | |
24 | ||
25 | static bool partition_check_cpu(struct partition_desc *part, | |
26 | unsigned int cpu, unsigned int hwirq) | |
27 | { | |
28 | return cpumask_test_cpu(cpu, &part->parts[hwirq].mask); | |
29 | } | |
30 | ||
31 | static void partition_irq_mask(struct irq_data *d) | |
32 | { | |
33 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
34 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
35 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
36 | ||
37 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
38 | chip->irq_mask) | |
39 | chip->irq_mask(data); | |
40 | } | |
41 | ||
42 | static void partition_irq_unmask(struct irq_data *d) | |
43 | { | |
44 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
45 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
46 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
47 | ||
48 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
49 | chip->irq_unmask) | |
50 | chip->irq_unmask(data); | |
51 | } | |
52 | ||
53 | static int partition_irq_set_irqchip_state(struct irq_data *d, | |
54 | enum irqchip_irq_state which, | |
55 | bool val) | |
56 | { | |
57 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
58 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
59 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
60 | ||
61 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
62 | chip->irq_set_irqchip_state) | |
63 | return chip->irq_set_irqchip_state(data, which, val); | |
64 | ||
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | static int partition_irq_get_irqchip_state(struct irq_data *d, | |
69 | enum irqchip_irq_state which, | |
70 | bool *val) | |
71 | { | |
72 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
73 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
74 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
75 | ||
76 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
77 | chip->irq_get_irqchip_state) | |
78 | return chip->irq_get_irqchip_state(data, which, val); | |
79 | ||
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | static int partition_irq_set_type(struct irq_data *d, unsigned int type) | |
84 | { | |
85 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
86 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
87 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
88 | ||
89 | if (chip->irq_set_type) | |
90 | return chip->irq_set_type(data, type); | |
91 | ||
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | static void partition_irq_print_chip(struct irq_data *d, struct seq_file *p) | |
96 | { | |
97 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
98 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
99 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
100 | ||
101 | seq_printf(p, " %5s-%lu", chip->name, data->hwirq); | |
102 | } | |
103 | ||
104 | static struct irq_chip partition_irq_chip = { | |
105 | .irq_mask = partition_irq_mask, | |
106 | .irq_unmask = partition_irq_unmask, | |
107 | .irq_set_type = partition_irq_set_type, | |
108 | .irq_get_irqchip_state = partition_irq_get_irqchip_state, | |
109 | .irq_set_irqchip_state = partition_irq_set_irqchip_state, | |
110 | .irq_print_chip = partition_irq_print_chip, | |
111 | }; | |
112 | ||
113 | static void partition_handle_irq(struct irq_desc *desc) | |
114 | { | |
115 | struct partition_desc *part = irq_desc_get_handler_data(desc); | |
116 | struct irq_chip *chip = irq_desc_get_chip(desc); | |
117 | int cpu = smp_processor_id(); | |
118 | int hwirq; | |
119 | ||
120 | chained_irq_enter(chip, desc); | |
121 | ||
122 | for_each_set_bit(hwirq, part->bitmap, part->nr_parts) { | |
123 | if (partition_check_cpu(part, cpu, hwirq)) | |
124 | break; | |
125 | } | |
126 | ||
046a6ee2 | 127 | if (unlikely(hwirq == part->nr_parts)) |
9e2c986c | 128 | handle_bad_irq(desc); |
046a6ee2 MZ |
129 | else |
130 | generic_handle_domain_irq(part->domain, hwirq); | |
9e2c986c MZ |
131 | |
132 | chained_irq_exit(chip, desc); | |
133 | } | |
134 | ||
135 | static int partition_domain_alloc(struct irq_domain *domain, unsigned int virq, | |
136 | unsigned int nr_irqs, void *arg) | |
137 | { | |
138 | int ret; | |
139 | irq_hw_number_t hwirq; | |
140 | unsigned int type; | |
141 | struct irq_fwspec *fwspec = arg; | |
142 | struct partition_desc *part; | |
143 | ||
144 | BUG_ON(nr_irqs != 1); | |
145 | ret = domain->ops->translate(domain, fwspec, &hwirq, &type); | |
146 | if (ret) | |
147 | return ret; | |
148 | ||
149 | part = domain->host_data; | |
150 | ||
151 | set_bit(hwirq, part->bitmap); | |
152 | irq_set_chained_handler_and_data(irq_desc_get_irq(part->chained_desc), | |
153 | partition_handle_irq, part); | |
154 | irq_set_percpu_devid_partition(virq, &part->parts[hwirq].mask); | |
155 | irq_domain_set_info(domain, virq, hwirq, &partition_irq_chip, part, | |
156 | handle_percpu_devid_irq, NULL, NULL); | |
157 | irq_set_status_flags(virq, IRQ_NOAUTOEN); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static void partition_domain_free(struct irq_domain *domain, unsigned int virq, | |
163 | unsigned int nr_irqs) | |
164 | { | |
165 | struct irq_data *d; | |
166 | ||
167 | BUG_ON(nr_irqs != 1); | |
168 | ||
169 | d = irq_domain_get_irq_data(domain, virq); | |
170 | irq_set_handler(virq, NULL); | |
171 | irq_domain_reset_irq_data(d); | |
172 | } | |
173 | ||
174 | int partition_translate_id(struct partition_desc *desc, void *partition_id) | |
175 | { | |
176 | struct partition_affinity *part = NULL; | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < desc->nr_parts; i++) { | |
180 | if (desc->parts[i].partition_id == partition_id) { | |
181 | part = &desc->parts[i]; | |
182 | break; | |
183 | } | |
184 | } | |
185 | ||
186 | if (WARN_ON(!part)) { | |
187 | pr_err("Failed to find partition\n"); | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | return i; | |
192 | } | |
193 | ||
194 | struct partition_desc *partition_create_desc(struct fwnode_handle *fwnode, | |
195 | struct partition_affinity *parts, | |
196 | int nr_parts, | |
197 | int chained_irq, | |
198 | const struct irq_domain_ops *ops) | |
199 | { | |
200 | struct partition_desc *desc; | |
201 | struct irq_domain *d; | |
202 | ||
203 | BUG_ON(!ops->select || !ops->translate); | |
204 | ||
205 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
206 | if (!desc) | |
207 | return NULL; | |
208 | ||
209 | desc->ops = *ops; | |
210 | desc->ops.free = partition_domain_free; | |
211 | desc->ops.alloc = partition_domain_alloc; | |
212 | ||
213 | d = irq_domain_create_linear(fwnode, nr_parts, &desc->ops, desc); | |
214 | if (!d) | |
215 | goto out; | |
216 | desc->domain = d; | |
217 | ||
4cad4da0 | 218 | desc->bitmap = bitmap_zalloc(nr_parts, GFP_KERNEL); |
9e2c986c MZ |
219 | if (WARN_ON(!desc->bitmap)) |
220 | goto out; | |
221 | ||
222 | desc->chained_desc = irq_to_desc(chained_irq); | |
223 | desc->nr_parts = nr_parts; | |
224 | desc->parts = parts; | |
225 | ||
226 | return desc; | |
227 | out: | |
228 | if (d) | |
229 | irq_domain_remove(d); | |
230 | kfree(desc); | |
231 | ||
232 | return NULL; | |
233 | } | |
234 | ||
235 | struct irq_domain *partition_get_domain(struct partition_desc *dsc) | |
236 | { | |
237 | if (dsc) | |
238 | return dsc->domain; | |
239 | ||
240 | return NULL; | |
241 | } |