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0002
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0004 #include <linux/irqdomain.h>
0005 #include <linux/irq.h>
0006 #include <linux/uaccess.h>
0007
0008 #include "internals.h"
0009
0010 static struct dentry *irq_dir;
0011
0012 struct irq_bit_descr {
0013 unsigned int mask;
0014 char *name;
0015 };
0016 #define BIT_MASK_DESCR(m) { .mask = m, .name = #m }
0017
0018 static void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
0019 const struct irq_bit_descr *sd, int size)
0020 {
0021 int i;
0022
0023 for (i = 0; i < size; i++, sd++) {
0024 if (state & sd->mask)
0025 seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
0026 }
0027 }
0028
0029 #ifdef CONFIG_SMP
0030 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
0031 {
0032 struct irq_data *data = irq_desc_get_irq_data(desc);
0033 const struct cpumask *msk;
0034
0035 msk = irq_data_get_affinity_mask(data);
0036 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
0037 #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
0038 msk = irq_data_get_effective_affinity_mask(data);
0039 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
0040 #endif
0041 #ifdef CONFIG_GENERIC_PENDING_IRQ
0042 msk = desc->pending_mask;
0043 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk));
0044 #endif
0045 }
0046 #else
0047 static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
0048 #endif
0049
0050 static const struct irq_bit_descr irqchip_flags[] = {
0051 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
0052 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
0053 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
0054 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
0055 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
0056 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
0057 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
0058 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
0059 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
0060 BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
0061 BIT_MASK_DESCR(IRQCHIP_IMMUTABLE),
0062 };
0063
0064 static void
0065 irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
0066 {
0067 struct irq_chip *chip = data->chip;
0068
0069 if (!chip) {
0070 seq_printf(m, "chip: None\n");
0071 return;
0072 }
0073 seq_printf(m, "%*schip: ", ind, "");
0074 if (chip->irq_print_chip)
0075 chip->irq_print_chip(data, m);
0076 else
0077 seq_printf(m, "%s", chip->name);
0078 seq_printf(m, "\n%*sflags: 0x%lx\n", ind + 1, "", chip->flags);
0079 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
0080 ARRAY_SIZE(irqchip_flags));
0081 }
0082
0083 static void
0084 irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
0085 {
0086 seq_printf(m, "%*sdomain: %s\n", ind, "",
0087 data->domain ? data->domain->name : "");
0088 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq);
0089 irq_debug_show_chip(m, data, ind + 1);
0090 if (data->domain && data->domain->ops && data->domain->ops->debug_show)
0091 data->domain->ops->debug_show(m, NULL, data, ind + 1);
0092 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
0093 if (!data->parent_data)
0094 return;
0095 seq_printf(m, "%*sparent:\n", ind + 1, "");
0096 irq_debug_show_data(m, data->parent_data, ind + 4);
0097 #endif
0098 }
0099
0100 static const struct irq_bit_descr irqdata_states[] = {
0101 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
0102 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
0103 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
0104 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
0105 BIT_MASK_DESCR(IRQD_LEVEL),
0106
0107 BIT_MASK_DESCR(IRQD_ACTIVATED),
0108 BIT_MASK_DESCR(IRQD_IRQ_STARTED),
0109 BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
0110 BIT_MASK_DESCR(IRQD_IRQ_MASKED),
0111 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),
0112
0113 BIT_MASK_DESCR(IRQD_PER_CPU),
0114 BIT_MASK_DESCR(IRQD_NO_BALANCING),
0115
0116 BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
0117 BIT_MASK_DESCR(IRQD_MOVE_PCNTXT),
0118 BIT_MASK_DESCR(IRQD_AFFINITY_SET),
0119 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
0120 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
0121 BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE),
0122 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
0123 BIT_MASK_DESCR(IRQD_CAN_RESERVE),
0124 BIT_MASK_DESCR(IRQD_MSI_NOMASK_QUIRK),
0125
0126 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
0127
0128 BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
0129 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),
0130
0131 BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET),
0132
0133 BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),
0134
0135 BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),
0136 };
0137
0138 static const struct irq_bit_descr irqdesc_states[] = {
0139 BIT_MASK_DESCR(_IRQ_NOPROBE),
0140 BIT_MASK_DESCR(_IRQ_NOREQUEST),
0141 BIT_MASK_DESCR(_IRQ_NOTHREAD),
0142 BIT_MASK_DESCR(_IRQ_NOAUTOEN),
0143 BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
0144 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
0145 BIT_MASK_DESCR(_IRQ_IS_POLLED),
0146 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
0147 BIT_MASK_DESCR(_IRQ_HIDDEN),
0148 };
0149
0150 static const struct irq_bit_descr irqdesc_istates[] = {
0151 BIT_MASK_DESCR(IRQS_AUTODETECT),
0152 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
0153 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
0154 BIT_MASK_DESCR(IRQS_ONESHOT),
0155 BIT_MASK_DESCR(IRQS_REPLAY),
0156 BIT_MASK_DESCR(IRQS_WAITING),
0157 BIT_MASK_DESCR(IRQS_PENDING),
0158 BIT_MASK_DESCR(IRQS_SUSPENDED),
0159 BIT_MASK_DESCR(IRQS_NMI),
0160 };
0161
0162
0163 static int irq_debug_show(struct seq_file *m, void *p)
0164 {
0165 struct irq_desc *desc = m->private;
0166 struct irq_data *data;
0167
0168 raw_spin_lock_irq(&desc->lock);
0169 data = irq_desc_get_irq_data(desc);
0170 seq_printf(m, "handler: %ps\n", desc->handle_irq);
0171 seq_printf(m, "device: %s\n", desc->dev_name);
0172 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors);
0173 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
0174 ARRAY_SIZE(irqdesc_states));
0175 seq_printf(m, "istate: 0x%08x\n", desc->istate);
0176 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
0177 ARRAY_SIZE(irqdesc_istates));
0178 seq_printf(m, "ddepth: %u\n", desc->depth);
0179 seq_printf(m, "wdepth: %u\n", desc->wake_depth);
0180 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data));
0181 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
0182 ARRAY_SIZE(irqdata_states));
0183 seq_printf(m, "node: %d\n", irq_data_get_node(data));
0184 irq_debug_show_masks(m, desc);
0185 irq_debug_show_data(m, data, 0);
0186 raw_spin_unlock_irq(&desc->lock);
0187 return 0;
0188 }
0189
0190 static int irq_debug_open(struct inode *inode, struct file *file)
0191 {
0192 return single_open(file, irq_debug_show, inode->i_private);
0193 }
0194
0195 static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
0196 size_t count, loff_t *ppos)
0197 {
0198 struct irq_desc *desc = file_inode(file)->i_private;
0199 char buf[8] = { 0, };
0200 size_t size;
0201
0202 size = min(sizeof(buf) - 1, count);
0203 if (copy_from_user(buf, user_buf, size))
0204 return -EFAULT;
0205
0206 if (!strncmp(buf, "trigger", size)) {
0207 int err = irq_inject_interrupt(irq_desc_get_irq(desc));
0208
0209 return err ? err : count;
0210 }
0211
0212 return count;
0213 }
0214
0215 static const struct file_operations dfs_irq_ops = {
0216 .open = irq_debug_open,
0217 .write = irq_debug_write,
0218 .read = seq_read,
0219 .llseek = seq_lseek,
0220 .release = single_release,
0221 };
0222
0223 void irq_debugfs_copy_devname(int irq, struct device *dev)
0224 {
0225 struct irq_desc *desc = irq_to_desc(irq);
0226 const char *name = dev_name(dev);
0227
0228 if (name)
0229 desc->dev_name = kstrdup(name, GFP_KERNEL);
0230 }
0231
0232 void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
0233 {
0234 char name [10];
0235
0236 if (!irq_dir || !desc || desc->debugfs_file)
0237 return;
0238
0239 sprintf(name, "%d", irq);
0240 desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
0241 &dfs_irq_ops);
0242 }
0243
0244 static int __init irq_debugfs_init(void)
0245 {
0246 struct dentry *root_dir;
0247 int irq;
0248
0249 root_dir = debugfs_create_dir("irq", NULL);
0250
0251 irq_domain_debugfs_init(root_dir);
0252
0253 irq_dir = debugfs_create_dir("irqs", root_dir);
0254
0255 irq_lock_sparse();
0256 for_each_active_irq(irq)
0257 irq_add_debugfs_entry(irq, irq_to_desc(irq));
0258 irq_unlock_sparse();
0259
0260 return 0;
0261 }
0262 __initcall(irq_debugfs_init);
