1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 ARM Limited, All Rights Reserved. 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 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 } 126 127 if (unlikely(hwirq == part->nr_parts)) 128 handle_bad_irq(desc); 129 else 130 generic_handle_domain_irq(part->domain, hwirq); 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; 217 218 desc->bitmap = bitmap_zalloc(nr_parts, GFP_KERNEL); 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 } 242