Quelle  debugfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
// Copyright 2017 Thomas Gleixner <tglx@linutronix.de>

#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/uaccess.h>

#include "internals.h"

static struct dentry *irq_dir;

void irq_debug_show_bits(struct seq_file *m, int ind, unsigned int state,
    const struct irq_bit_descr *sd, int size)
{
 int i;

 for (i = 0; i < size; i++, sd++) {
  if (state & sd->mask)
   seq_printf(m, "%*s%s\n", ind + 12, "", sd->name);
 }
}

#ifdef CONFIG_SMP
static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc)
{
 struct irq_data *data = irq_desc_get_irq_data(desc);
 const struct cpumask *msk;

 msk = irq_data_get_affinity_mask(data);
 seq_printf(m, "affinity: %*pbl\n", cpumask_pr_args(msk));
#ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
 msk = irq_data_get_effective_affinity_mask(data);
 seq_printf(m, "effectiv: %*pbl\n", cpumask_pr_args(msk));
#endif
#ifdef CONFIG_GENERIC_PENDING_IRQ
 msk = desc->pending_mask;
 seq_printf(m, "pending: %*pbl\n", cpumask_pr_args(msk));
#endif
}
#else
static void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc) { }
#endif

static const struct irq_bit_descr irqchip_flags[] = {
 BIT_MASK_DESCR(IRQCHIP_SET_TYPE_MASKED),
 BIT_MASK_DESCR(IRQCHIP_EOI_IF_HANDLED),
 BIT_MASK_DESCR(IRQCHIP_MASK_ON_SUSPEND),
 BIT_MASK_DESCR(IRQCHIP_ONOFFLINE_ENABLED),
 BIT_MASK_DESCR(IRQCHIP_SKIP_SET_WAKE),
 BIT_MASK_DESCR(IRQCHIP_ONESHOT_SAFE),
 BIT_MASK_DESCR(IRQCHIP_EOI_THREADED),
 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
 BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
 BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
 BIT_MASK_DESCR(IRQCHIP_IMMUTABLE),
 BIT_MASK_DESCR(IRQCHIP_MOVE_DEFERRED),
};

static void
irq_debug_show_chip(struct seq_file *m, struct irq_data *data, int ind)
{
 struct irq_chip *chip = data->chip;

 if (!chip) {
  seq_printf(m, "chip: None\n");
  return;
 }
 seq_printf(m, "%*schip: ", ind, "");
 if (chip->irq_print_chip)
  chip->irq_print_chip(data, m);
 else
  seq_printf(m, "%s", chip->name);
 seq_printf(m, "\n%*sflags: 0x%lx\n", ind + 1, "", chip->flags);
 irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,
       ARRAY_SIZE(irqchip_flags));
}

static void
irq_debug_show_data(struct seq_file *m, struct irq_data *data, int ind)
{
 seq_printf(m, "%*sdomain: %s\n", ind, "",
     data->domain ? data->domain->name : "");
 seq_printf(m, "%*shwirq: 0x%lx\n", ind + 1, "", data->hwirq);
 irq_debug_show_chip(m, data, ind + 1);
 if (data->domain && data->domain->ops && data->domain->ops->debug_show)
  data->domain->ops->debug_show(m, NULL, data, ind + 1);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
 if (!data->parent_data)
  return;
 seq_printf(m, "%*sparent:\n", ind + 1, "");
 irq_debug_show_data(m, data->parent_data, ind + 4);
#endif
}

static const struct irq_bit_descr irqdata_states[] = {
 BIT_MASK_DESCR(IRQ_TYPE_EDGE_RISING),
 BIT_MASK_DESCR(IRQ_TYPE_EDGE_FALLING),
 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_HIGH),
 BIT_MASK_DESCR(IRQ_TYPE_LEVEL_LOW),
 BIT_MASK_DESCR(IRQD_LEVEL),

 BIT_MASK_DESCR(IRQD_ACTIVATED),
 BIT_MASK_DESCR(IRQD_IRQ_STARTED),
 BIT_MASK_DESCR(IRQD_IRQ_DISABLED),
 BIT_MASK_DESCR(IRQD_IRQ_MASKED),
 BIT_MASK_DESCR(IRQD_IRQ_INPROGRESS),

 BIT_MASK_DESCR(IRQD_PER_CPU),
 BIT_MASK_DESCR(IRQD_NO_BALANCING),

 BIT_MASK_DESCR(IRQD_SINGLE_TARGET),
 BIT_MASK_DESCR(IRQD_AFFINITY_SET),
 BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
 BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
 BIT_MASK_DESCR(IRQD_AFFINITY_ON_ACTIVATE),
 BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
 BIT_MASK_DESCR(IRQD_CAN_RESERVE),

 BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),

 BIT_MASK_DESCR(IRQD_WAKEUP_STATE),
 BIT_MASK_DESCR(IRQD_WAKEUP_ARMED),

 BIT_MASK_DESCR(IRQD_DEFAULT_TRIGGER_SET),

 BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),

 BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),

 BIT_MASK_DESCR(IRQD_RESEND_WHEN_IN_PROGRESS),
};

static const struct irq_bit_descr irqdesc_states[] = {
 BIT_MASK_DESCR(_IRQ_NOPROBE),
 BIT_MASK_DESCR(_IRQ_NOREQUEST),
 BIT_MASK_DESCR(_IRQ_NOTHREAD),
 BIT_MASK_DESCR(_IRQ_NOAUTOEN),
 BIT_MASK_DESCR(_IRQ_NESTED_THREAD),
 BIT_MASK_DESCR(_IRQ_PER_CPU_DEVID),
 BIT_MASK_DESCR(_IRQ_IS_POLLED),
 BIT_MASK_DESCR(_IRQ_DISABLE_UNLAZY),
 BIT_MASK_DESCR(_IRQ_HIDDEN),
};

static const struct irq_bit_descr irqdesc_istates[] = {
 BIT_MASK_DESCR(IRQS_AUTODETECT),
 BIT_MASK_DESCR(IRQS_SPURIOUS_DISABLED),
 BIT_MASK_DESCR(IRQS_POLL_INPROGRESS),
 BIT_MASK_DESCR(IRQS_ONESHOT),
 BIT_MASK_DESCR(IRQS_REPLAY),
 BIT_MASK_DESCR(IRQS_WAITING),
 BIT_MASK_DESCR(IRQS_PENDING),
 BIT_MASK_DESCR(IRQS_SUSPENDED),
 BIT_MASK_DESCR(IRQS_NMI),
};


static int irq_debug_show(struct seq_file *m, void *p)
{
 struct irq_desc *desc = m->private;
 struct irq_data *data;

 guard(raw_spinlock_irq)(&desc->lock);
 data = irq_desc_get_irq_data(desc);
 seq_printf(m, "handler: %ps\n", desc->handle_irq);
 seq_printf(m, "device: %s\n", desc->dev_name);
 seq_printf(m, "status: 0x%08x\n", desc->status_use_accessors);
 irq_debug_show_bits(m, 0, desc->status_use_accessors, irqdesc_states,
       ARRAY_SIZE(irqdesc_states));
 seq_printf(m, "istate: 0x%08x\n", desc->istate);
 irq_debug_show_bits(m, 0, desc->istate, irqdesc_istates,
       ARRAY_SIZE(irqdesc_istates));
 seq_printf(m, "ddepth: %u\n", desc->depth);
 seq_printf(m, "wdepth: %u\n", desc->wake_depth);
 seq_printf(m, "dstate: 0x%08x\n", irqd_get(data));
 irq_debug_show_bits(m, 0, irqd_get(data), irqdata_states,
       ARRAY_SIZE(irqdata_states));
 seq_printf(m, "node: %d\n", irq_data_get_node(data));
 irq_debug_show_masks(m, desc);
 irq_debug_show_data(m, data, 0);
 return 0;
}

static int irq_debug_open(struct inode *inode, struct file *file)
{
 return single_open(file, irq_debug_show, inode->i_private);
}

static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
          size_t count, loff_t *ppos)
{
 struct irq_desc *desc = file_inode(file)->i_private;
 char buf[8] = { 0, };
 size_t size;

 size = min(sizeof(buf) - 1, count);
 if (copy_from_user(buf, user_buf, size))
  return -EFAULT;

 if (!strncmp(buf, "trigger", size)) {
  int err = irq_inject_interrupt(irq_desc_get_irq(desc));

  return err ? err : count;
 }

 return count;
}

static const struct file_operations dfs_irq_ops = {
 .open  = irq_debug_open,
 .write  = irq_debug_write,
 .read  = seq_read,
 .llseek  = seq_lseek,
 .release = single_release,
};

void irq_debugfs_copy_devname(int irq, struct device *dev)
{
 struct irq_desc *desc = irq_to_desc(irq);
 const char *name = dev_name(dev);

 if (name)
  desc->dev_name = kstrdup(name, GFP_KERNEL);
}

void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
{
 char name [12];

 if (!irq_dir || !desc || desc->debugfs_file)
  return;

 sprintf(name, "%u", irq);
 desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
       &dfs_irq_ops);
}

static int __init irq_debugfs_init(void)
{
 struct dentry *root_dir;
 int irq;

 root_dir = debugfs_create_dir("irq", NULL);

 irq_domain_debugfs_init(root_dir);

 irq_dir = debugfs_create_dir("irqs", root_dir);

 irq_lock_sparse();
 for_each_active_irq(irq)
  irq_add_debugfs_entry(irq, irq_to_desc(irq));
 irq_unlock_sparse();

 return 0;
}
__initcall(irq_debugfs_init);