[lttng-modules.git] / wrapper / page_alloc.c

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 * wrapper/page_alloc.c
 *
 * wrapper around get_pfnblock_flags_mask and Ubuntu
 * get_pageblock_flags_mask. Using KALLSYMS to get their address when
 * available, else we need to have a kernel that exports this function
 * to GPL modules.
 *
 * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include <lttng-kernel-version.h>

#if (defined(CONFIG_KALLSYMS) \
	&& (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,19,2)	\
		|| LTTNG_KERNEL_RANGE(3,14,36, 3,15,0)		\
		|| LTTNG_KERNEL_RANGE(3,18,10, 3,19,0)		\
		|| LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \
		|| LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0)))

/* Include page_alloc wrapper before pageblock-flags.h. */
#include <wrapper/page_alloc.h>

#include <linux/pageblock-flags.h>
#include <linux/kallsyms.h>
#include <linux/mm_types.h>
#include <linux/module.h>
#include <wrapper/kallsyms.h>
#include <lttng-kernel-version.h>

#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,14,0))
static
unsigned long (*get_pfnblock_flags_mask_sym)(const struct page *page,
		unsigned long pfn,
		unsigned long mask);

unsigned long wrapper_get_pfnblock_flags_mask(const struct page *page,
		unsigned long pfn,
		unsigned long mask)
{
	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	if (get_pfnblock_flags_mask_sym) {
		return get_pfnblock_flags_mask_sym(page, pfn, mask);
	} else {
		return -ENOSYS;
	}
}
#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0))
static
unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page,
		unsigned long pfn,
		unsigned long mask);

unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
		unsigned long pfn,
		unsigned long mask)
{
	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	if (get_pfnblock_flags_mask_sym) {
		return get_pfnblock_flags_mask_sym(page, pfn, mask);
	} else {
		return -ENOSYS;
	}
}
#else	/* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0)) */
static
unsigned long (*get_pfnblock_flags_mask_sym)(struct page *page,
		unsigned long pfn,
		unsigned long end_bitidx,
		unsigned long mask);

unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
		unsigned long pfn,
		unsigned long end_bitidx,
		unsigned long mask)
{
	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	if (get_pfnblock_flags_mask_sym) {
		return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask);
	} else {
		return -ENOSYS;
	}
}
#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0)) */

EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask);

int wrapper_get_pfnblock_flags_mask_init(void)
{
	get_pfnblock_flags_mask_sym =
		(void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask");
	if (!get_pfnblock_flags_mask_sym)
		return -1;
	return 0;
}
EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);

#else

#include <linux/pageblock-flags.h>

#endif

#if (defined(CONFIG_KALLSYMS) \
	&& LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))

#include <linux/kallsyms.h>
#include <linux/mm_types.h>
#include <linux/module.h>
#include <wrapper/kallsyms.h>
#include <wrapper/page_alloc.h>

static
unsigned long (*get_pageblock_flags_mask_sym)(struct page *page,
		unsigned long end_bitidx,
		unsigned long mask);

unsigned long wrapper_get_pageblock_flags_mask(struct page *page,
		unsigned long end_bitidx,
		unsigned long mask)
{
	WARN_ON_ONCE(!get_pageblock_flags_mask_sym);
	if (get_pageblock_flags_mask_sym) {
		return get_pageblock_flags_mask_sym(page, end_bitidx, mask);
	} else {
		return -ENOSYS;
	}
}
EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask);

int wrapper_get_pageblock_flags_mask_init(void)
{
	get_pageblock_flags_mask_sym =
		(void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
	if (!get_pageblock_flags_mask_sym)
		return -1;
	return 0;
}
EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);

#else

#include <linux/pageblock-flags.h>

#endif
Commit	Line	Data
9f36eaed	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
389d7070 MD	2	* wrapper/page_alloc.c
389d7070 MD	3	*
0e14d6e7 MD	4	* wrapper around get_pfnblock_flags_mask and Ubuntu
	5	* get_pageblock_flags_mask. Using KALLSYMS to get their address when
	6	* available, else we need to have a kernel that exports this function
	7	* to GPL modules.
389d7070 MD	8	*
389d7070 MD	9	* Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
389d7070 MD	10	*/
389d7070 MD	11
5a2f5e92	12	#include <lttng-kernel-version.h>
389d7070	13
ffc696db	14	#if (defined(CONFIG_KALLSYMS) \
2d042821	15	&& (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,19,2) \
36561775 MD	16	\|\| LTTNG_KERNEL_RANGE(3,14,36, 3,15,0) \
36561775 MD	17	\|\| LTTNG_KERNEL_RANGE(3,18,10, 3,19,0) \
397c12b4 MD	18	\|\| LTTNG_DEBIAN_KERNEL_RANGE(3,16,7,9,0,0, 3,17,0,0,0,0) \
397c12b4 MD	19	\|\| LTTNG_UBUNTU_KERNEL_RANGE(3,16,7,34, 3,17,0,0)))
389d7070	20
7a03a49a MD	21	/* Include page_alloc wrapper before pageblock-flags.h. */
	22	#include <wrapper/page_alloc.h>
	23
	24	#include <linux/pageblock-flags.h>
389d7070 MD	25	#include <linux/kallsyms.h>
	26	#include <linux/mm_types.h>
	27	#include <linux/module.h>
5a2f5e92	28	#include <wrapper/kallsyms.h>
7a03a49a MD	29	#include <lttng-kernel-version.h>
	30
	31	#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,14,0))
	32	static
	33	unsigned long (get_pfnblock_flags_mask_sym)(const struct page page,
	34	unsigned long pfn,
	35	unsigned long mask);
	36
	37	unsigned long wrapper_get_pfnblock_flags_mask(const struct page *page,
	38	unsigned long pfn,
	39	unsigned long mask)
	40	{
	41	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	42	if (get_pfnblock_flags_mask_sym) {
	43	return get_pfnblock_flags_mask_sym(page, pfn, mask);
	44	} else {
	45	return -ENOSYS;
	46	}
	47	}
	48	#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0))
	49	static
	50	unsigned long (get_pfnblock_flags_mask_sym)(struct page page,
	51	unsigned long pfn,
	52	unsigned long mask);
389d7070	53
7a03a49a MD	54	unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
	55	unsigned long pfn,
	56	unsigned long mask)
	57	{
	58	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	59	if (get_pfnblock_flags_mask_sym) {
	60	return get_pfnblock_flags_mask_sym(page, pfn, mask);
	61	} else {
	62	return -ENOSYS;
	63	}
	64	}
	65	#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0)) */
389d7070 MD	66	static
	67	unsigned long (get_pfnblock_flags_mask_sym)(struct page page,
	68	unsigned long pfn,
	69	unsigned long end_bitidx,
	70	unsigned long mask);
	71
	72	unsigned long wrapper_get_pfnblock_flags_mask(struct page *page,
	73	unsigned long pfn,
	74	unsigned long end_bitidx,
	75	unsigned long mask)
	76	{
	77	WARN_ON_ONCE(!get_pfnblock_flags_mask_sym);
	78	if (get_pfnblock_flags_mask_sym) {
	79	return get_pfnblock_flags_mask_sym(page, pfn, end_bitidx, mask);
	80	} else {
	81	return -ENOSYS;
	82	}
	83	}
7a03a49a MD	84	#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0)) */
7a03a49a MD	85
389d7070 MD	86	EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask);
	87
	88	int wrapper_get_pfnblock_flags_mask_init(void)
	89	{
	90	get_pfnblock_flags_mask_sym =
	91	(void *) kallsyms_lookup_funcptr("get_pfnblock_flags_mask");
	92	if (!get_pfnblock_flags_mask_sym)
	93	return -1;
	94	return 0;
	95	}
d4d4da49	96	EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
389d7070	97
0e14d6e7	98	#else
389d7070 MD	99
	100	#include <linux/pageblock-flags.h>
	101
0e14d6e7 MD	102	#endif
	103
	104	#if (defined(CONFIG_KALLSYMS) \
	105	&& LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,50, 3,14,0,0))
	106
	107	#include <linux/kallsyms.h>
	108	#include <linux/mm_types.h>
	109	#include <linux/module.h>
5a2f5e92 MD	110	#include <wrapper/kallsyms.h>
5a2f5e92 MD	111	#include <wrapper/page_alloc.h>
0e14d6e7 MD	112
	113	static
	114	unsigned long (get_pageblock_flags_mask_sym)(struct page page,
	115	unsigned long end_bitidx,
	116	unsigned long mask);
	117
	118	unsigned long wrapper_get_pageblock_flags_mask(struct page *page,
	119	unsigned long end_bitidx,
	120	unsigned long mask)
	121	{
	122	WARN_ON_ONCE(!get_pageblock_flags_mask_sym);
	123	if (get_pageblock_flags_mask_sym) {
	124	return get_pageblock_flags_mask_sym(page, end_bitidx, mask);
	125	} else {
	126	return -ENOSYS;
	127	}
	128	}
	129	EXPORT_SYMBOL_GPL(wrapper_get_pageblock_flags_mask);
	130
	131	int wrapper_get_pageblock_flags_mask_init(void)
	132	{
	133	get_pageblock_flags_mask_sym =
	134	(void *) kallsyms_lookup_funcptr("get_pageblock_flags_mask");
	135	if (!get_pageblock_flags_mask_sym)
	136	return -1;
	137	return 0;
	138	}
d4d4da49	139	EXPORT_SYMBOL_GPL(wrapper_get_pfnblock_flags_mask_init);
0e14d6e7 MD	140
	141	#else
	142
	143	#include <linux/pageblock-flags.h>
	144
	145	#endif