summaryrefslogtreecommitdiff
path: root/arch/x86/mm/highmem_32.c
blob: 9cf33d3ee5bc7ee0d10fbc4b0ce9c9fc04697ee8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
#include <linux/highmem.h>
#include <linux/module.h>

void *kmap(struct page *page)
{
	might_sleep();
	if (!PageHighMem(page))
		return page_address(page);
	return kmap_high(page);
}

void kunmap(struct page *page)
{
	if (in_interrupt())
		BUG();
	if (!PageHighMem(page))
		return;
	kunmap_high(page);
}

static void debug_kmap_atomic_prot(enum km_type type)
{
#ifdef CONFIG_DEBUG_HIGHMEM
	static unsigned warn_count = 10;

	if (unlikely(warn_count == 0))
		return;

	if (unlikely(in_interrupt())) {
		if (in_irq()) {
			if (type != KM_IRQ0 && type != KM_IRQ1 &&
			    type != KM_BIO_SRC_IRQ && type != KM_BIO_DST_IRQ &&
			    type != KM_BOUNCE_READ) {
				WARN_ON(1);
				warn_count--;
			}
		} else if (!irqs_disabled()) {	/* softirq */
			if (type != KM_IRQ0 && type != KM_IRQ1 &&
			    type != KM_SOFTIRQ0 && type != KM_SOFTIRQ1 &&
			    type != KM_SKB_SUNRPC_DATA &&
			    type != KM_SKB_DATA_SOFTIRQ &&
			    type != KM_BOUNCE_READ) {
				WARN_ON(1);
				warn_count--;
			}
		}
	}

	if (type == KM_IRQ0 || type == KM_IRQ1 || type == KM_BOUNCE_READ ||
			type == KM_BIO_SRC_IRQ || type == KM_BIO_DST_IRQ) {
		if (!irqs_disabled()) {
			WARN_ON(1);
			warn_count--;
		}
	} else if (type == KM_SOFTIRQ0 || type == KM_SOFTIRQ1) {
		if (irq_count() == 0 && !irqs_disabled()) {
			WARN_ON(1);
			warn_count--;
		}
	}
#endif
}

/*
 * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
 * no global lock is needed and because the kmap code must perform a global TLB
 * invalidation when the kmap pool wraps.
 *
 * However when holding an atomic kmap is is not legal to sleep, so atomic
 * kmaps are appropriate for short, tight code paths only.
 */
void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
{
	enum fixed_addresses idx;
	unsigned long vaddr;

	/* even !CONFIG_PREEMPT needs this, for in_atomic in do_page_fault */
	pagefault_disable();

	if (!PageHighMem(page))
		return page_address(page);

	debug_kmap_atomic_prot(type);

	idx = type + KM_TYPE_NR*smp_processor_id();
	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
	BUG_ON(!pte_none(*(kmap_pte-idx)));
	set_pte(kmap_pte-idx, mk_pte(page, prot));
	arch_flush_lazy_mmu_mode();

	return (void *)vaddr;
}

void *kmap_atomic(struct page *page, enum km_type type)
{
	return kmap_atomic_prot(page, type, kmap_prot);
}

void kunmap_atomic(void *kvaddr, enum km_type type)
{
	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
	enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();

	/*
	 * Force other mappings to Oops if they'll try to access this pte
	 * without first remap it.  Keeping stale mappings around is a bad idea
	 * also, in case the page changes cacheability attributes or becomes
	 * a protected page in a hypervisor.
	 */
	if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
		kpte_clear_flush(kmap_pte-idx, vaddr);
	else {
#ifdef CONFIG_DEBUG_HIGHMEM
		BUG_ON(vaddr < PAGE_OFFSET);
		BUG_ON(vaddr >= (unsigned long)high_memory);
#endif
	}

	arch_flush_lazy_mmu_mode();
	pagefault_enable();
}

/* This is the same as kmap_atomic() but can map memory that doesn't
 * have a struct page associated with it.
 */
void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
{
	enum fixed_addresses idx;
	unsigned long vaddr;

	pagefault_disable();

	idx = type + KM_TYPE_NR*smp_processor_id();
	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
	set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot));
	arch_flush_lazy_mmu_mode();

	return (void*) vaddr;
}

struct page *kmap_atomic_to_page(void *ptr)
{
	unsigned long idx, vaddr = (unsigned long)ptr;
	pte_t *pte;

	if (vaddr < FIXADDR_START)
		return virt_to_page(ptr);

	idx = virt_to_fix(vaddr);
	pte = kmap_pte - (idx - FIX_KMAP_BEGIN);
	return pte_page(*pte);
}

EXPORT_SYMBOL(kmap);
EXPORT_SYMBOL(kunmap);
EXPORT_SYMBOL(kmap_atomic);
EXPORT_SYMBOL(kunmap_atomic);
EXPORT_SYMBOL(kmap_atomic_to_page);