linux/include/linux/mmiotrace.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MMIOTRACE_H
#define _LINUX_MMIOTRACE_H

#include <linux/types.h>
#include <linux/list.h>

struct kmmio_probe;
struct pt_regs;

kmmio_pre_handler_t;
kmmio_post_handler_t;

struct kmmio_probe { … };

extern unsigned int kmmio_count;

extern int register_kmmio_probe(struct kmmio_probe *p);
extern void unregister_kmmio_probe(struct kmmio_probe *p);
extern int kmmio_init(void);
extern void kmmio_cleanup(void);

#ifdef CONFIG_MMIOTRACE
/* kmmio is active by some kmmio_probes? */
static inline int is_kmmio_active(void)
{ … }

/* Called from page fault handler. */
extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);

/* Called from ioremap.c */
extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
							void __iomem *addr);
extern void mmiotrace_iounmap(volatile void __iomem *addr);

/* For anyone to insert markers. Remember trailing newline. */
extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...);
#else /* !CONFIG_MMIOTRACE: */
static inline int is_kmmio_active(void)
{
	return 0;
}

static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
{
	return 0;
}

static inline void mmiotrace_ioremap(resource_size_t offset,
					unsigned long size, void __iomem *addr)
{
}

static inline void mmiotrace_iounmap(volatile void __iomem *addr)
{
}

static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
{
	return 0;
}
#endif /* CONFIG_MMIOTRACE */

enum mm_io_opcode { … };

struct mmiotrace_rw { … };

struct mmiotrace_map { … };

/* in kernel/trace/trace_mmiotrace.c */
extern void enable_mmiotrace(void);
extern void disable_mmiotrace(void);
extern void mmio_trace_rw(struct mmiotrace_rw *rw);
extern void mmio_trace_mapping(struct mmiotrace_map *map);
extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args);

#endif /* _LINUX_MMIOTRACE_H */