[linux-block.git] / include / linux / highmem-internal.h

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

/*
 * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
 */
#ifdef CONFIG_KMAP_LOCAL
void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
void kunmap_local_indexed(void *vaddr);
void kmap_local_fork(struct task_struct *tsk);
void __kmap_local_sched_out(void);
void __kmap_local_sched_in(void);
static inline void kmap_assert_nomap(void)
{
	DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);
}
#else
static inline void kmap_local_fork(struct task_struct *tsk) { }
static inline void kmap_assert_nomap(void) { }
#endif

#ifdef CONFIG_HIGHMEM
#include <asm/highmem.h>

#ifndef ARCH_HAS_KMAP_FLUSH_TLB
static inline void kmap_flush_tlb(unsigned long addr) { }
#endif

#ifndef kmap_prot
#define kmap_prot PAGE_KERNEL
#endif

void *kmap_high(struct page *page);
void kunmap_high(struct page *page);
void __kmap_flush_unused(void);
struct page *__kmap_to_page(void *addr);

static inline void *kmap(struct page *page)
{
	void *addr;

	might_sleep();
	if (!PageHighMem(page))
		addr = page_address(page);
	else
		addr = kmap_high(page);
	kmap_flush_tlb((unsigned long)addr);
	return addr;
}

static inline void kunmap(struct page *page)
{
	might_sleep();
	if (!PageHighMem(page))
		return;
	kunmap_high(page);
}

static inline struct page *kmap_to_page(void *addr)
{
	return __kmap_to_page(addr);
}

static inline void kmap_flush_unused(void)
{
	__kmap_flush_unused();
}

static inline void *kmap_local_page(struct page *page)
{
	return __kmap_local_page_prot(page, kmap_prot);
}

static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
{
	return __kmap_local_page_prot(page, prot);
}

static inline void *kmap_local_pfn(unsigned long pfn)
{
	return __kmap_local_pfn_prot(pfn, kmap_prot);
}

static inline void __kunmap_local(void *vaddr)
{
	kunmap_local_indexed(vaddr);
}

static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
{
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_disable();
	else
		preempt_disable();

	pagefault_disable();
	return __kmap_local_page_prot(page, prot);
}

static inline void *kmap_atomic(struct page *page)
{
	return kmap_atomic_prot(page, kmap_prot);
}

static inline void *kmap_atomic_pfn(unsigned long pfn)
{
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_disable();
	else
		preempt_disable();

	pagefault_disable();
	return __kmap_local_pfn_prot(pfn, kmap_prot);
}

static inline void __kunmap_atomic(void *addr)
{
	kunmap_local_indexed(addr);
	pagefault_enable();
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_enable();
	else
		preempt_enable();
}

unsigned int __nr_free_highpages(void);
extern atomic_long_t _totalhigh_pages;

static inline unsigned int nr_free_highpages(void)
{
	return __nr_free_highpages();
}

static inline unsigned long totalhigh_pages(void)
{
	return (unsigned long)atomic_long_read(&_totalhigh_pages);
}

static inline void totalhigh_pages_add(long count)
{
	atomic_long_add(count, &_totalhigh_pages);
}

#else /* CONFIG_HIGHMEM */

static inline struct page *kmap_to_page(void *addr)
{
	return virt_to_page(addr);
}

static inline void *kmap(struct page *page)
{
	might_sleep();
	return page_address(page);
}

static inline void kunmap_high(struct page *page) { }
static inline void kmap_flush_unused(void) { }

static inline void kunmap(struct page *page)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	kunmap_flush_on_unmap(page_address(page));
#endif
}

static inline void *kmap_local_page(struct page *page)
{
	return page_address(page);
}

static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
{
	return kmap_local_page(page);
}

static inline void *kmap_local_pfn(unsigned long pfn)
{
	return kmap_local_page(pfn_to_page(pfn));
}

static inline void __kunmap_local(void *addr)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	kunmap_flush_on_unmap(addr);
#endif
}

static inline void *kmap_atomic(struct page *page)
{
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_disable();
	else
		preempt_disable();
	pagefault_disable();
	return page_address(page);
}

static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
{
	return kmap_atomic(page);
}

static inline void *kmap_atomic_pfn(unsigned long pfn)
{
	return kmap_atomic(pfn_to_page(pfn));
}

static inline void __kunmap_atomic(void *addr)
{
#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	kunmap_flush_on_unmap(addr);
#endif
	pagefault_enable();
	if (IS_ENABLED(CONFIG_PREEMPT_RT))
		migrate_enable();
	else
		preempt_enable();
}

static inline unsigned int nr_free_highpages(void) { return 0; }
static inline unsigned long totalhigh_pages(void) { return 0UL; }

#endif /* CONFIG_HIGHMEM */

/*
 * Prevent people trying to call kunmap_atomic() as if it were kunmap()
 * kunmap_atomic() should get the return value of kmap_atomic, not the page.
 */
#define kunmap_atomic(__addr)					\
do {								\
	BUILD_BUG_ON(__same_type((__addr), struct page *));	\
	__kunmap_atomic(__addr);				\
} while (0)

#define kunmap_local(__addr)					\
do {								\
	BUILD_BUG_ON(__same_type((__addr), struct page *));	\
	__kunmap_local(__addr);					\
} while (0)

#endif
Commit	Line	Data
13f876ba TG	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_HIGHMEM_INTERNAL_H
	3	#define _LINUX_HIGHMEM_INTERNAL_H
	4
	5	/*
	6	* Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
	7	*/
	8	#ifdef CONFIG_KMAP_LOCAL
	9	void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
	10	void __kmap_local_page_prot(struct page page, pgprot_t prot);
	11	void kunmap_local_indexed(void *vaddr);
5fbda3ec TG	12	void kmap_local_fork(struct task_struct *tsk);
	13	void __kmap_local_sched_out(void);
	14	void __kmap_local_sched_in(void);
	15	static inline void kmap_assert_nomap(void)
	16	{
	17	DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);
	18	}
	19	#else
	20	static inline void kmap_local_fork(struct task_struct *tsk) { }
	21	static inline void kmap_assert_nomap(void) { }
13f876ba TG	22	#endif
	23
	24	#ifdef CONFIG_HIGHMEM
	25	#include <asm/highmem.h>
	26
	27	#ifndef ARCH_HAS_KMAP_FLUSH_TLB
	28	static inline void kmap_flush_tlb(unsigned long addr) { }
	29	#endif
	30
	31	#ifndef kmap_prot
	32	#define kmap_prot PAGE_KERNEL
	33	#endif
	34
	35	void kmap_high(struct page page);
	36	void kunmap_high(struct page *page);
	37	void __kmap_flush_unused(void);
	38	struct page __kmap_to_page(void addr);
	39
	40	static inline void kmap(struct page page)
	41	{
	42	void *addr;
	43
	44	might_sleep();
	45	if (!PageHighMem(page))
	46	addr = page_address(page);
	47	else
	48	addr = kmap_high(page);
	49	kmap_flush_tlb((unsigned long)addr);
	50	return addr;
	51	}
	52
	53	static inline void kunmap(struct page *page)
	54	{
	55	might_sleep();
	56	if (!PageHighMem(page))
	57	return;
	58	kunmap_high(page);
	59	}
	60
	61	static inline struct page kmap_to_page(void addr)
	62	{
	63	return __kmap_to_page(addr);
	64	}
	65
	66	static inline void kmap_flush_unused(void)
	67	{
	68	__kmap_flush_unused();
	69	}
	70
f3ba3c71 TG	71	static inline void kmap_local_page(struct page page)
	72	{
	73	return __kmap_local_page_prot(page, kmap_prot);
	74	}
	75
	76	static inline void kmap_local_page_prot(struct page page, pgprot_t prot)
	77	{
	78	return __kmap_local_page_prot(page, prot);
	79	}
	80
	81	static inline void *kmap_local_pfn(unsigned long pfn)
	82	{
	83	return __kmap_local_pfn_prot(pfn, kmap_prot);
	84	}
	85
	86	static inline void __kunmap_local(void *vaddr)
	87	{
	88	kunmap_local_indexed(vaddr);
	89	}
	90
13f876ba TG	91	static inline void kmap_atomic_prot(struct page page, pgprot_t prot)
13f876ba TG	92	{
51386120 SAS	93	if (IS_ENABLED(CONFIG_PREEMPT_RT))
	94	migrate_disable();
	95	else
	96	preempt_disable();
	97
13f876ba TG	98	pagefault_disable();
	99	return __kmap_local_page_prot(page, prot);
	100	}
	101
	102	static inline void kmap_atomic(struct page page)
	103	{
	104	return kmap_atomic_prot(page, kmap_prot);
	105	}
	106
	107	static inline void *kmap_atomic_pfn(unsigned long pfn)
	108	{
51386120 SAS	109	if (IS_ENABLED(CONFIG_PREEMPT_RT))
	110	migrate_disable();
	111	else
	112	preempt_disable();
	113
13f876ba TG	114	pagefault_disable();
	115	return __kmap_local_pfn_prot(pfn, kmap_prot);
	116	}
	117
	118	static inline void __kunmap_atomic(void *addr)
	119	{
	120	kunmap_local_indexed(addr);
	121	pagefault_enable();
51386120 SAS	122	if (IS_ENABLED(CONFIG_PREEMPT_RT))
	123	migrate_enable();
	124	else
	125	preempt_enable();
13f876ba TG	126	}
	127
	128	unsigned int __nr_free_highpages(void);
	129	extern atomic_long_t _totalhigh_pages;
	130
	131	static inline unsigned int nr_free_highpages(void)
	132	{
	133	return __nr_free_highpages();
	134	}
	135
	136	static inline unsigned long totalhigh_pages(void)
	137	{
	138	return (unsigned long)atomic_long_read(&_totalhigh_pages);
	139	}
	140
13f876ba TG	141	static inline void totalhigh_pages_add(long count)
	142	{
	143	atomic_long_add(count, &_totalhigh_pages);
	144	}
	145
	146	#else /* CONFIG_HIGHMEM */
	147
	148	static inline struct page kmap_to_page(void addr)
	149	{
	150	return virt_to_page(addr);
	151	}
	152
	153	static inline void kmap(struct page page)
	154	{
	155	might_sleep();
	156	return page_address(page);
	157	}
	158
	159	static inline void kunmap_high(struct page *page) { }
	160	static inline void kmap_flush_unused(void) { }
	161
	162	static inline void kunmap(struct page *page)
	163	{
	164	#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	165	kunmap_flush_on_unmap(page_address(page));
	166	#endif
	167	}
	168
f3ba3c71 TG	169	static inline void kmap_local_page(struct page page)
	170	{
	171	return page_address(page);
	172	}
	173
	174	static inline void kmap_local_page_prot(struct page page, pgprot_t prot)
	175	{
	176	return kmap_local_page(page);
	177	}
	178
	179	static inline void *kmap_local_pfn(unsigned long pfn)
	180	{
	181	return kmap_local_page(pfn_to_page(pfn));
	182	}
	183
	184	static inline void __kunmap_local(void *addr)
	185	{
	186	#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	187	kunmap_flush_on_unmap(addr);
	188	#endif
	189	}
	190
13f876ba TG	191	static inline void kmap_atomic(struct page page)
13f876ba TG	192	{
51386120 SAS	193	if (IS_ENABLED(CONFIG_PREEMPT_RT))
	194	migrate_disable();
	195	else
	196	preempt_disable();
13f876ba TG	197	pagefault_disable();
	198	return page_address(page);
	199	}
	200
	201	static inline void kmap_atomic_prot(struct page page, pgprot_t prot)
	202	{
	203	return kmap_atomic(page);
	204	}
	205
	206	static inline void *kmap_atomic_pfn(unsigned long pfn)
	207	{
	208	return kmap_atomic(pfn_to_page(pfn));
	209	}
	210
	211	static inline void __kunmap_atomic(void *addr)
	212	{
	213	#ifdef ARCH_HAS_FLUSH_ON_KUNMAP
	214	kunmap_flush_on_unmap(addr);
	215	#endif
	216	pagefault_enable();
51386120 SAS	217	if (IS_ENABLED(CONFIG_PREEMPT_RT))
	218	migrate_enable();
	219	else
	220	preempt_enable();
13f876ba TG	221	}
	222
	223	static inline unsigned int nr_free_highpages(void) { return 0; }
	224	static inline unsigned long totalhigh_pages(void) { return 0UL; }
	225
	226	#endif /* CONFIG_HIGHMEM */
	227
	228	/*
	229	* Prevent people trying to call kunmap_atomic() as if it were kunmap()
	230	* kunmap_atomic() should get the return value of kmap_atomic, not the page.
	231	*/
	232	#define kunmap_atomic(__addr) \
	233	do { \
	234	BUILD_BUG_ON(__same_type((__addr), struct page *)); \
	235	__kunmap_atomic(__addr); \
	236	} while (0)
	237
f3ba3c71 TG	238	#define kunmap_local(__addr) \
	239	do { \
	240	BUILD_BUG_ON(__same_type((__addr), struct page *)); \
	241	__kunmap_local(__addr); \
	242	} while (0)
	243
13f876ba	244	#endif