/* 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;
|
|
typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
|
struct pt_regs *, unsigned long addr);
|
typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
|
unsigned long condition, struct pt_regs *);
|
|
struct kmmio_probe {
|
/* kmmio internal list: */
|
struct list_head list;
|
/* start location of the probe point: */
|
unsigned long addr;
|
/* length of the probe region: */
|
unsigned long len;
|
/* Called before addr is executed: */
|
kmmio_pre_handler_t pre_handler;
|
/* Called after addr is executed: */
|
kmmio_post_handler_t post_handler;
|
void *private;
|
};
|
|
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)
|
{
|
return kmmio_count;
|
}
|
|
/* 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 {
|
MMIO_READ = 0x1, /* struct mmiotrace_rw */
|
MMIO_WRITE = 0x2, /* struct mmiotrace_rw */
|
MMIO_PROBE = 0x3, /* struct mmiotrace_map */
|
MMIO_UNPROBE = 0x4, /* struct mmiotrace_map */
|
MMIO_UNKNOWN_OP = 0x5, /* struct mmiotrace_rw */
|
};
|
|
struct mmiotrace_rw {
|
resource_size_t phys; /* PCI address of register */
|
unsigned long value;
|
unsigned long pc; /* optional program counter */
|
int map_id;
|
unsigned char opcode; /* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
|
unsigned char width; /* size of register access in bytes */
|
};
|
|
struct mmiotrace_map {
|
resource_size_t phys; /* base address in PCI space */
|
unsigned long virt; /* base virtual address */
|
unsigned long len; /* mapping size */
|
int map_id;
|
unsigned char opcode; /* MMIO_PROBE or MMIO_UNPROBE */
|
};
|
|
/* 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 */
|
