// 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; struct irq_bit_descr {	unsigned int	mask;	char		*name;};#define BIT_MASK_DESCR(m)	{ .mask = m, .name = #m } static 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_SMPstatic void irq_debug_show_masks(struct seq_file *m, struct irq_desc *desc){	struct irq_data *data = irq_desc_get_irq_data(desc);	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}#elsestatic 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),}; static voidirq_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:    %s\n", ind, "", chip->name);	seq_printf(m, "%*sflags:   0x%lx\n", ind + 1, "", chip->flags);	irq_debug_show_bits(m, ind, chip->flags, irqchip_flags,			    ARRAY_SIZE(irqchip_flags));} static voidirq_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_MOVE_PCNTXT),	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_MSI_NOMASK_QUIRK), 	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),}; 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),}; 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; 	raw_spin_lock_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);	raw_spin_unlock_irq(&desc->lock);	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 [10]; 	if (!irq_dir || !desc || desc->debugfs_file)		return; 	sprintf(name, "%d", 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);