cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mmiotrace.h (3122B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_MMIOTRACE_H
      3#define _LINUX_MMIOTRACE_H
      4
      5#include <linux/types.h>
      6#include <linux/list.h>
      7
      8struct kmmio_probe;
      9struct pt_regs;
     10
     11typedef void (*kmmio_pre_handler_t)(struct kmmio_probe *,
     12				struct pt_regs *, unsigned long addr);
     13typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
     14				unsigned long condition, struct pt_regs *);
     15
     16struct kmmio_probe {
     17	/* kmmio internal list: */
     18	struct list_head	list;
     19	/* start location of the probe point: */
     20	unsigned long		addr;
     21	/* length of the probe region: */
     22	unsigned long		len;
     23	/* Called before addr is executed: */
     24	kmmio_pre_handler_t	pre_handler;
     25	/* Called after addr is executed: */
     26	kmmio_post_handler_t	post_handler;
     27	void			*private;
     28};
     29
     30extern unsigned int kmmio_count;
     31
     32extern int register_kmmio_probe(struct kmmio_probe *p);
     33extern void unregister_kmmio_probe(struct kmmio_probe *p);
     34extern int kmmio_init(void);
     35extern void kmmio_cleanup(void);
     36
     37#ifdef CONFIG_MMIOTRACE
     38/* kmmio is active by some kmmio_probes? */
     39static inline int is_kmmio_active(void)
     40{
     41	return kmmio_count;
     42}
     43
     44/* Called from page fault handler. */
     45extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
     46
     47/* Called from ioremap.c */
     48extern void mmiotrace_ioremap(resource_size_t offset, unsigned long size,
     49							void __iomem *addr);
     50extern void mmiotrace_iounmap(volatile void __iomem *addr);
     51
     52/* For anyone to insert markers. Remember trailing newline. */
     53extern __printf(1, 2) int mmiotrace_printk(const char *fmt, ...);
     54#else /* !CONFIG_MMIOTRACE: */
     55static inline int is_kmmio_active(void)
     56{
     57	return 0;
     58}
     59
     60static inline int kmmio_handler(struct pt_regs *regs, unsigned long addr)
     61{
     62	return 0;
     63}
     64
     65static inline void mmiotrace_ioremap(resource_size_t offset,
     66					unsigned long size, void __iomem *addr)
     67{
     68}
     69
     70static inline void mmiotrace_iounmap(volatile void __iomem *addr)
     71{
     72}
     73
     74static inline __printf(1, 2) int mmiotrace_printk(const char *fmt, ...)
     75{
     76	return 0;
     77}
     78#endif /* CONFIG_MMIOTRACE */
     79
     80enum mm_io_opcode {
     81	MMIO_READ	= 0x1,	/* struct mmiotrace_rw */
     82	MMIO_WRITE	= 0x2,	/* struct mmiotrace_rw */
     83	MMIO_PROBE	= 0x3,	/* struct mmiotrace_map */
     84	MMIO_UNPROBE	= 0x4,	/* struct mmiotrace_map */
     85	MMIO_UNKNOWN_OP = 0x5,	/* struct mmiotrace_rw */
     86};
     87
     88struct mmiotrace_rw {
     89	resource_size_t	phys;	/* PCI address of register */
     90	unsigned long	value;
     91	unsigned long	pc;	/* optional program counter */
     92	int		map_id;
     93	unsigned char	opcode;	/* one of MMIO_{READ,WRITE,UNKNOWN_OP} */
     94	unsigned char	width;	/* size of register access in bytes */
     95};
     96
     97struct mmiotrace_map {
     98	resource_size_t	phys;	/* base address in PCI space */
     99	unsigned long	virt;	/* base virtual address */
    100	unsigned long	len;	/* mapping size */
    101	int		map_id;
    102	unsigned char	opcode;	/* MMIO_PROBE or MMIO_UNPROBE */
    103};
    104
    105/* in kernel/trace/trace_mmiotrace.c */
    106extern void enable_mmiotrace(void);
    107extern void disable_mmiotrace(void);
    108extern void mmio_trace_rw(struct mmiotrace_rw *rw);
    109extern void mmio_trace_mapping(struct mmiotrace_map *map);
    110extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args);
    111
    112#endif /* _LINUX_MMIOTRACE_H */