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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
27struct 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
36static 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
42static 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
53static 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
64static 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
79static 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
94static 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
106static 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
115static 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
124static 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
149static 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
176static 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
188int 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
208struct 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 = kcalloc(BITS_TO_LONGS(nr_parts), sizeof(long),
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;
242out:
243 if (d)
244 irq_domain_remove(d);
245 kfree(desc);
246
247 return NULL;
248}
249
250struct irq_domain *partition_get_domain(struct partition_desc *dsc)
251{
252 if (dsc)
253 return dsc->domain;
254
255 return NULL;
256}
257

Warning: That file was not part of the compilation database. It may have many parsing errors.