1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright 2017 Thomas Gleixner <tglx@linutronix.de> 3 4 #include <linux/irqdomain.h> 5 #include <linux/irq.h> 6 #include <linux/uaccess.h> 7 8 #include "internals.h" 9 10 static struct dentry *irq_dir; 11 12 struct irq_bit_descr { 13 unsigned int mask; 14 char *name; 15 }; 16 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m } 17 18 static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state, 19 const struct irq_bit_descr *sd, int size) 20 { 21 int i; 22 23 for (i = 0; i < size; i++, sd++) { 24 if (state & sd->mask) 25 seq_printf(m, "%*s%s\n", ind + 12, "", sd->name); 26 } 27 } 28 29 #ifdef CONFIG_SMP 30 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) 31 { 32 struct irq_data *data = irq_desc_get_irq_data(desc); 33 const struct cpumask *msk; 34 35 msk = irq_data_get_affinity_mask(data); 36 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk)); 37 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK 38 msk = irq_data_get_effective_affinity_mask(data); 39 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk)); 40 #endif 41 #ifdef CONFIG_GENERIC_PENDING_IRQ 42 msk = desc->pending_mask; 43 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk)); 44 #endif 45 } 46 #else 47 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { } 48 #endif 49 50 static const struct irq_bit_descr irqchip_flags[] = { 51 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED), 52 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED), 53 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND), 54 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED), 55 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE), 56 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE), 57 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED), 58 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI), 59 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI), 60 BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND), 61 BIT_MASK_DESCR(IRQCHIP_IMMUTABLE), 62 }; 63 64 static void 65 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind) 66 { 67 struct irq_chip *chip = data->chip; 68 69 if (!chip) { 70 seq_printf(m, "chip: None\n"); 71 return; 72 } 73 seq_printf(m, "%*schip: ", ind, ""); 74 if (chip->irq_print_chip) 75 chip->irq_print_chip(data, m); 76 else 77 seq_printf(m, "%s", chip->name); 78 seq_printf(m, "\n%*sflags: 0x%lx\n", ind + 1, "", chip->flags); 79 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags, 80 ARRAY_SIZE(irqchip_flags)); 81 } 82 83 static void 84 irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind) 85 { 86 seq_printf(m, "%*sdomain: %s\n", ind, "", 87 data->domain ? data->domain->name : ""); 88 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq); 89 irq_debug_show_chip(m, data, ind + 1); 90 if (data->domain && data->domain->ops && data->domain->ops->debug_show) 91 data->domain->ops->debug_show(m, NULL, data, ind + 1); 92 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 93 if (!data->parent_data) 94 return; 95 seq_printf(m, "%*sparent:\n", ind + 1, ""); 96 irq_debug_show_data(m, data->parent_data, ind + 4); 97 #endif 98 } 99 100 static const struct irq_bit_descr irqdata_states[] = { 101 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING), 102 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING), 103 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH), 104 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW), 105 BIT_MASK_DESCR(IRQD_LEVEL), 106 107 BIT_MASK_DESCR(IRQD_ACTIVATED), 108 BIT_MASK_DESCR(IRQD_IRQ_STARTED), 109 BIT_MASK_DESCR(IRQD_IRQ_DISABLED), 110 BIT_MASK_DESCR(IRQD_IRQ_MASKED), 111 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS), 112 113 BIT_MASK_DESCR(IRQD_PER_CPU), 114 BIT_MASK_DESCR(IRQD_NO_BALANCING), 115 116 BIT_MASK_DESCR(IRQD_SINGLE_TARGET), 117 BIT_MASK_DESCR(IRQD_MOVE_PCNTXT), 118 BIT_MASK_DESCR(IRQD_AFFINITY_SET), 119 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING), 120 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED), 121 BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE), 122 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN), 123 BIT_MASK_DESCR(IRQD_CAN_RESERVE), 124 BIT_MASK_DESCR(IRQD_MSI_NOMASK_QUIRK), 125 126 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU), 127 128 BIT_MASK_DESCR(IRQD_WAKEUP_STATE), 129 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED), 130 131 BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET), 132 133 BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX), 134 135 BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND), 136 137 BIT_MASK_DESCR(IRQD_RESEND_WHEN_IN_PROGRESS), 138 }; 139 140 static const struct irq_bit_descr irqdesc_states[] = { 141 BIT_MASK_DESCR(_IRQ_NOPROBE), 142 BIT_MASK_DESCR(_IRQ_NOREQUEST), 143 BIT_MASK_DESCR(_IRQ_NOTHREAD), 144 BIT_MASK_DESCR(_IRQ_NOAUTOEN), 145 BIT_MASK_DESCR(_IRQ_NESTED_THREAD), 146 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID), 147 BIT_MASK_DESCR(_IRQ_IS_POLLED), 148 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY), 149 BIT_MASK_DESCR(_IRQ_HIDDEN), 150 }; 151 152 static const struct irq_bit_descr irqdesc_istates[] = { 153 BIT_MASK_DESCR(IRQS_AUTODETECT), 154 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED), 155 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS), 156 BIT_MASK_DESCR(IRQS_ONESHOT), 157 BIT_MASK_DESCR(IRQS_REPLAY), 158 BIT_MASK_DESCR(IRQS_WAITING), 159 BIT_MASK_DESCR(IRQS_PENDING), 160 BIT_MASK_DESCR(IRQS_SUSPENDED), 161 BIT_MASK_DESCR(IRQS_NMI), 162 }; 163 164 165 static int irq_debug_show(struct seq_file *m, void *p) 166 { 167 struct irq_desc *desc = m->private; 168 struct irq_data *data; 169 170 raw_spin_lock_irq(&desc->lock); 171 data = irq_desc_get_irq_data(desc); 172 seq_printf(m, "handler: %ps\n", desc->handle_irq); 173 seq_printf(m, "device: %s\n", desc->dev_name); 174 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors); 175 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states, 176 ARRAY_SIZE(irqdesc_states)); 177 seq_printf(m, "istate: 0x%08x\n", desc->istate); 178 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates, 179 ARRAY_SIZE(irqdesc_istates)); 180 seq_printf(m, "ddepth: %u\n", desc->depth); 181 seq_printf(m, "wdepth: %u\n", desc->wake_depth); 182 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data)); 183 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states, 184 ARRAY_SIZE(irqdata_states)); 185 seq_printf(m, "node: %d\n", irq_data_get_node(data)); 186 irq_debug_show_masks(m, desc); 187 irq_debug_show_data(m, data, 0); 188 raw_spin_unlock_irq(&desc->lock); 189 return 0; 190 } 191 192 static int irq_debug_open(struct inode *inode, struct file *file) 193 { 194 return single_open(file, irq_debug_show, inode->i_private); 195 } 196 197 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf, 198 size_t count, loff_t *ppos) 199 { 200 struct irq_desc *desc = file_inode(file)->i_private; 201 char buf[8] = { 0, }; 202 size_t size; 203 204 size = min(sizeof(buf) - 1, count); 205 if (copy_from_user(buf, user_buf, size)) 206 return -EFAULT; 207 208 if (!strncmp(buf, "trigger", size)) { 209 int err = irq_inject_interrupt(irq_desc_get_irq(desc)); 210 211 return err ? err : count; 212 } 213 214 return count; 215 } 216 217 static const struct file_operations dfs_irq_ops = { 218 .open = irq_debug_open, 219 .write = irq_debug_write, 220 .read = seq_read, 221 .llseek = seq_lseek, 222 .release = single_release, 223 }; 224 225 void irq_debugfs_copy_devname(int irq, struct device *dev) 226 { 227 struct irq_desc *desc = irq_to_desc(irq); 228 const char *name = dev_name(dev); 229 230 if (name) 231 desc->dev_name = kstrdup(name, GFP_KERNEL); 232 } 233 234 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc) 235 { 236 char name [10]; 237 238 if (!irq_dir || !desc || desc->debugfs_file) 239 return; 240 241 sprintf(name, "%d", irq); 242 desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc, 243 &dfs_irq_ops); 244 } 245 246 static int __init irq_debugfs_init(void) 247 { 248 struct dentry *root_dir; 249 int irq; 250 251 root_dir = debugfs_create_dir("irq", NULL); 252 253 irq_domain_debugfs_init(root_dir); 254 255 irq_dir = debugfs_create_dir("irqs", root_dir); 256 257 irq_lock_sparse(); 258 for_each_active_irq(irq) 259 irq_add_debugfs_entry(irq, irq_to_desc(irq)); 260 irq_unlock_sparse(); 261 262 return 0; 263 } 264 __initcall(irq_debugfs_init); 265