summaryrefslogtreecommitdiff
path: root/arch/loongarch/mm/init.c
blob: bf789d114c2d79a284b5d6e5acb84659c2c5d375 (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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#include <linux/init.h>
#include <linux/export.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <linux/memremap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>
#include <linux/hardirq.h>
#include <linux/gfp.h>
#include <linux/hugetlb.h>
#include <linux/mmzone.h>
#include <linux/execmem.h>

#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>

unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);

void copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma)
{
	void *vfrom, *vto;

	vfrom = kmap_local_page(from);
	vto = kmap_local_page(to);
	copy_page(vto, vfrom);
	kunmap_local(vfrom);
	kunmap_local(vto);
	/* Make sure this page is cleared on other CPU's too before using it */
	smp_wmb();
}

int __ref page_is_ram(unsigned long pfn)
{
	unsigned long addr = PFN_PHYS(pfn);

	return memblock_is_memory(addr) && !memblock_is_reserved(addr);
}

#ifndef CONFIG_NUMA
void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];

#ifdef CONFIG_ZONE_DMA
	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

	free_area_init(max_zone_pfns);
}

void __init mem_init(void)
{
	max_mapnr = max_low_pfn;
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

	memblock_free_all();
}
#endif /* !CONFIG_NUMA */

void __ref free_initmem(void)
{
	free_initmem_default(POISON_FREE_INITMEM);
}

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	int ret;

	ret = __add_pages(nid, start_pfn, nr_pages, params);

	if (ret)
		pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n",
				__func__,  ret);

	return ret;
}

void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	struct page *page = pfn_to_page(start_pfn);

	/* With altmap the first mapped page is offset from @start */
	if (altmap)
		page += vmem_altmap_offset(altmap);
	__remove_pages(start_pfn, nr_pages, altmap);
}

#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 start)
{
	return pa_to_nid(start);
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif

#ifdef CONFIG_SPARSEMEM_VMEMMAP
void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
			       unsigned long addr, unsigned long next)
{
	pmd_t entry;

	entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL);
	pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL;
	set_pmd_at(&init_mm, addr, pmd, entry);
}

int __meminit vmemmap_check_pmd(pmd_t *pmd, int node,
				unsigned long addr, unsigned long next)
{
	int huge = pmd_val(*pmd) & _PAGE_HUGE;

	if (huge)
		vmemmap_verify((pte_t *)pmd, node, addr, next);

	return huge;
}

int __meminit vmemmap_populate(unsigned long start, unsigned long end,
			       int node, struct vmem_altmap *altmap)
{
#if CONFIG_PGTABLE_LEVELS == 2
	return vmemmap_populate_basepages(start, end, node, NULL);
#else
	return vmemmap_populate_hugepages(start, end, node, NULL);
#endif
}

#ifdef CONFIG_MEMORY_HOTPLUG
void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap)
{
}
#endif
#endif

pte_t * __init populate_kernel_pte(unsigned long addr)
{
	pgd_t *pgd = pgd_offset_k(addr);
	p4d_t *p4d = p4d_offset(pgd, addr);
	pud_t *pud;
	pmd_t *pmd;

	if (p4d_none(*p4d)) {
		pud = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
		if (!pud)
			panic("%s: Failed to allocate memory\n", __func__);
		p4d_populate(&init_mm, p4d, pud);
#ifndef __PAGETABLE_PUD_FOLDED
		pud_init(pud);
#endif
	}

	pud = pud_offset(p4d, addr);
	if (pud_none(*pud)) {
		pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
		if (!pmd)
			panic("%s: Failed to allocate memory\n", __func__);
		pud_populate(&init_mm, pud, pmd);
#ifndef __PAGETABLE_PMD_FOLDED
		pmd_init(pmd);
#endif
	}

	pmd = pmd_offset(pud, addr);
	if (!pmd_present(*pmd)) {
		pte_t *pte;

		pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
		if (!pte)
			panic("%s: Failed to allocate memory\n", __func__);
		pmd_populate_kernel(&init_mm, pmd, pte);
	}

	return pte_offset_kernel(pmd, addr);
}

void __init __set_fixmap(enum fixed_addresses idx,
			       phys_addr_t phys, pgprot_t flags)
{
	unsigned long addr = __fix_to_virt(idx);
	pte_t *ptep;

	BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);

	ptep = populate_kernel_pte(addr);
	if (!pte_none(*ptep)) {
		pte_ERROR(*ptep);
		return;
	}

	if (pgprot_val(flags))
		set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags));
	else {
		pte_clear(&init_mm, addr, ptep);
		flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
	}
}

/*
 * Align swapper_pg_dir in to 64K, allows its address to be loaded
 * with a single LUI instruction in the TLB handlers.  If we used
 * __aligned(64K), its size would get rounded up to the alignment
 * size, and waste space.  So we place it in its own section and align
 * it in the linker script.
 */
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir");

pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss;
#ifndef __PAGETABLE_PUD_FOLDED
pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pud_table);
#endif
#ifndef __PAGETABLE_PMD_FOLDED
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pmd_table);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);

#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;

struct execmem_info __init *execmem_arch_setup(void)
{
	execmem_info = (struct execmem_info){
		.ranges = {
			[EXECMEM_DEFAULT] = {
				.start	= MODULES_VADDR,
				.end	= MODULES_END,
				.pgprot	= PAGE_KERNEL,
				.alignment = 1,
			},
		},
	};

	return &execmem_info;
}
#endif /* CONFIG_EXECMEM */