Commit | Line | Data |
---|---|---|
9e2c986c MZ |
1 | /* |
2 | * Copyright (C) 2016 ARM Limited, All Rights Reserved. | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <linux/bitops.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/irqchip.h> | |
21 | #include <linux/irqchip/chained_irq.h> | |
22 | #include <linux/irqchip/irq-partition-percpu.h> | |
23 | #include <linux/irqdomain.h> | |
24 | #include <linux/seq_file.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | struct partition_desc { | |
28 | int nr_parts; | |
29 | struct partition_affinity *parts; | |
30 | struct irq_domain *domain; | |
31 | struct irq_desc *chained_desc; | |
32 | unsigned long *bitmap; | |
33 | struct irq_domain_ops ops; | |
34 | }; | |
35 | ||
36 | static bool partition_check_cpu(struct partition_desc *part, | |
37 | unsigned int cpu, unsigned int hwirq) | |
38 | { | |
39 | return cpumask_test_cpu(cpu, &part->parts[hwirq].mask); | |
40 | } | |
41 | ||
42 | static void partition_irq_mask(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_mask) | |
50 | chip->irq_mask(data); | |
51 | } | |
52 | ||
53 | static void partition_irq_unmask(struct irq_data *d) | |
54 | { | |
55 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
56 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
57 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
58 | ||
59 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
60 | chip->irq_unmask) | |
61 | chip->irq_unmask(data); | |
62 | } | |
63 | ||
64 | static int partition_irq_set_irqchip_state(struct irq_data *d, | |
65 | enum irqchip_irq_state which, | |
66 | bool val) | |
67 | { | |
68 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
69 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
70 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
71 | ||
72 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
73 | chip->irq_set_irqchip_state) | |
74 | return chip->irq_set_irqchip_state(data, which, val); | |
75 | ||
76 | return -EINVAL; | |
77 | } | |
78 | ||
79 | static int partition_irq_get_irqchip_state(struct irq_data *d, | |
80 | enum irqchip_irq_state which, | |
81 | bool *val) | |
82 | { | |
83 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
84 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
85 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
86 | ||
87 | if (partition_check_cpu(part, smp_processor_id(), d->hwirq) && | |
88 | chip->irq_get_irqchip_state) | |
89 | return chip->irq_get_irqchip_state(data, which, val); | |
90 | ||
91 | return -EINVAL; | |
92 | } | |
93 | ||
94 | static int partition_irq_set_type(struct irq_data *d, unsigned int type) | |
95 | { | |
96 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
97 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
98 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
99 | ||
100 | if (chip->irq_set_type) | |
101 | return chip->irq_set_type(data, type); | |
102 | ||
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | static void partition_irq_print_chip(struct irq_data *d, struct seq_file *p) | |
107 | { | |
108 | struct partition_desc *part = irq_data_get_irq_chip_data(d); | |
109 | struct irq_chip *chip = irq_desc_get_chip(part->chained_desc); | |
110 | struct irq_data *data = irq_desc_get_irq_data(part->chained_desc); | |
111 | ||
112 | seq_printf(p, " %5s-%lu", chip->name, data->hwirq); | |
113 | } | |
114 | ||
115 | static struct irq_chip partition_irq_chip = { | |
116 | .irq_mask = partition_irq_mask, | |
117 | .irq_unmask = partition_irq_unmask, | |
118 | .irq_set_type = partition_irq_set_type, | |
119 | .irq_get_irqchip_state = partition_irq_get_irqchip_state, | |
120 | .irq_set_irqchip_state = partition_irq_set_irqchip_state, | |
121 | .irq_print_chip = partition_irq_print_chip, | |
122 | }; | |
123 | ||
124 | static void partition_handle_irq(struct irq_desc *desc) | |
125 | { | |
126 | struct partition_desc *part = irq_desc_get_handler_data(desc); | |
127 | struct irq_chip *chip = irq_desc_get_chip(desc); | |
128 | int cpu = smp_processor_id(); | |
129 | int hwirq; | |
130 | ||
131 | chained_irq_enter(chip, desc); | |
132 | ||
133 | for_each_set_bit(hwirq, part->bitmap, part->nr_parts) { | |
134 | if (partition_check_cpu(part, cpu, hwirq)) | |
135 | break; | |
136 | } | |
137 | ||
138 | if (unlikely(hwirq == part->nr_parts)) { | |
139 | handle_bad_irq(desc); | |
140 | } else { | |
141 | unsigned int irq; | |
142 | irq = irq_find_mapping(part->domain, hwirq); | |
143 | generic_handle_irq(irq); | |
144 | } | |
145 | ||
146 | chained_irq_exit(chip, desc); | |
147 | } | |
148 | ||
149 | static int partition_domain_alloc(struct irq_domain *domain, unsigned int virq, | |
150 | unsigned int nr_irqs, void *arg) | |
151 | { | |
152 | int ret; | |
153 | irq_hw_number_t hwirq; | |
154 | unsigned int type; | |
155 | struct irq_fwspec *fwspec = arg; | |
156 | struct partition_desc *part; | |
157 | ||
158 | BUG_ON(nr_irqs != 1); | |
159 | ret = domain->ops->translate(domain, fwspec, &hwirq, &type); | |
160 | if (ret) | |
161 | return ret; | |
162 | ||
163 | part = domain->host_data; | |
164 | ||
165 | set_bit(hwirq, part->bitmap); | |
166 | irq_set_chained_handler_and_data(irq_desc_get_irq(part->chained_desc), | |
167 | partition_handle_irq, part); | |
168 | irq_set_percpu_devid_partition(virq, &part->parts[hwirq].mask); | |
169 | irq_domain_set_info(domain, virq, hwirq, &partition_irq_chip, part, | |
170 | handle_percpu_devid_irq, NULL, NULL); | |
171 | irq_set_status_flags(virq, IRQ_NOAUTOEN); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static void partition_domain_free(struct irq_domain *domain, unsigned int virq, | |
177 | unsigned int nr_irqs) | |
178 | { | |
179 | struct irq_data *d; | |
180 | ||
181 | BUG_ON(nr_irqs != 1); | |
182 | ||
183 | d = irq_domain_get_irq_data(domain, virq); | |
184 | irq_set_handler(virq, NULL); | |
185 | irq_domain_reset_irq_data(d); | |
186 | } | |
187 | ||
188 | int partition_translate_id(struct partition_desc *desc, void *partition_id) | |
189 | { | |
190 | struct partition_affinity *part = NULL; | |
191 | int i; | |
192 | ||
193 | for (i = 0; i < desc->nr_parts; i++) { | |
194 | if (desc->parts[i].partition_id == partition_id) { | |
195 | part = &desc->parts[i]; | |
196 | break; | |
197 | } | |
198 | } | |
199 | ||
200 | if (WARN_ON(!part)) { | |
201 | pr_err("Failed to find partition\n"); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | return i; | |
206 | } | |
207 | ||
208 | struct partition_desc *partition_create_desc(struct fwnode_handle *fwnode, | |
209 | struct partition_affinity *parts, | |
210 | int nr_parts, | |
211 | int chained_irq, | |
212 | const struct irq_domain_ops *ops) | |
213 | { | |
214 | struct partition_desc *desc; | |
215 | struct irq_domain *d; | |
216 | ||
217 | BUG_ON(!ops->select || !ops->translate); | |
218 | ||
219 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
220 | if (!desc) | |
221 | return NULL; | |
222 | ||
223 | desc->ops = *ops; | |
224 | desc->ops.free = partition_domain_free; | |
225 | desc->ops.alloc = partition_domain_alloc; | |
226 | ||
227 | d = irq_domain_create_linear(fwnode, nr_parts, &desc->ops, desc); | |
228 | if (!d) | |
229 | goto out; | |
230 | desc->domain = d; | |
231 | ||
232 | desc->bitmap = kzalloc(sizeof(long) * BITS_TO_LONGS(nr_parts), | |
233 | GFP_KERNEL); | |
234 | if (WARN_ON(!desc->bitmap)) | |
235 | goto out; | |
236 | ||
237 | desc->chained_desc = irq_to_desc(chained_irq); | |
238 | desc->nr_parts = nr_parts; | |
239 | desc->parts = parts; | |
240 | ||
241 | return desc; | |
242 | out: | |
243 | if (d) | |
244 | irq_domain_remove(d); | |
245 | kfree(desc); | |
246 | ||
247 | return NULL; | |
248 | } | |
249 | ||
250 | struct irq_domain *partition_get_domain(struct partition_desc *dsc) | |
251 | { | |
252 | if (dsc) | |
253 | return dsc->domain; | |
254 | ||
255 | return NULL; | |
256 | } |