[linux-block.git] / include / asm-generic / error-injection.h

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

#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
enum {
	EI_ETYPE_NULL,		/* Return NULL if failure */
	EI_ETYPE_ERRNO,		/* Return -ERRNO if failure */
	EI_ETYPE_ERRNO_NULL,	/* Return -ERRNO or NULL if failure */
	EI_ETYPE_TRUE,		/* Return true if failure */
};

struct error_injection_entry {
	unsigned long	addr;
	int		etype;
};

struct pt_regs;

#ifdef CONFIG_FUNCTION_ERROR_INJECTION
/*
 * Whitelist generating macro. Specify functions which can be error-injectable
 * using this macro. If you unsure what is required for the error-injectable
 * functions, please read Documentation/fault-injection/fault-injection.rst
 * 'Error Injectable Functions' section.
 */
#define ALLOW_ERROR_INJECTION(fname, _etype)				\
static struct error_injection_entry __used				\
	__section("_error_injection_whitelist")				\
	_eil_addr_##fname = {						\
		.addr = (unsigned long)fname,				\
		.etype = EI_ETYPE_##_etype,				\
	}

void override_function_with_return(struct pt_regs *regs);
#else
#define ALLOW_ERROR_INJECTION(fname, _etype)

static inline void override_function_with_return(struct pt_regs *regs) { }
#endif
#endif

#endif /* _ASM_GENERIC_ERROR_INJECTION_H */
Commit	Line	Data
540adea3 MH	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _ASM_GENERIC_ERROR_INJECTION_H
	3	#define _ASM_GENERIC_ERROR_INJECTION_H
	4
	5	#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
663faf9f	6	enum {
663faf9f MH	7	EI_ETYPE_NULL, /* Return NULL if failure */
	8	EI_ETYPE_ERRNO, /* Return -ERRNO if failure */
	9	EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */
af3b8544	10	EI_ETYPE_TRUE, /* Return true if failure */
663faf9f MH	11	};
	12
	13	struct error_injection_entry {
	14	unsigned long addr;
	15	int etype;
	16	};
	17
45880f7b LY	18	struct pt_regs;
45880f7b LY	19
540adea3 MH	20	#ifdef CONFIG_FUNCTION_ERROR_INJECTION
540adea3 MH	21	/*
bef7ec4e MHG	22	* Whitelist generating macro. Specify functions which can be error-injectable
	23	* using this macro. If you unsure what is required for the error-injectable
	24	* functions, please read Documentation/fault-injection/fault-injection.rst
	25	* 'Error Injectable Functions' section.
540adea3	26	*/
663faf9f MH	27	#define ALLOW_ERROR_INJECTION(fname, _etype) \
663faf9f MH	28	static struct error_injection_entry __used \
33def849	29	__section("_error_injection_whitelist") \
663faf9f MH	30	_eil_addr_##fname = { \
	31	.addr = (unsigned long)fname, \
	32	.etype = EI_ETYPE_##_etype, \
733e4175	33	}
45880f7b LY	34
45880f7b LY	35	void override_function_with_return(struct pt_regs *regs);
540adea3	36	#else
663faf9f	37	#define ALLOW_ERROR_INJECTION(fname, _etype)
45880f7b LY	38
45880f7b LY	39	static inline void override_function_with_return(struct pt_regs *regs) { }
540adea3 MH	40	#endif
	41	#endif
	42
	43	#endif /* _ASM_GENERIC_ERROR_INJECTION_H */