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56 lines
1.1 KiB
56 lines
1.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* PGD allocation/freeing |
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* |
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* Copyright (C) 2012 ARM Ltd. |
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* Author: Catalin Marinas <[email protected]> |
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*/ |
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#include <linux/mm.h> |
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#include <linux/gfp.h> |
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#include <linux/highmem.h> |
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#include <linux/slab.h> |
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#include <asm/pgalloc.h> |
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#include <asm/page.h> |
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#include <asm/tlbflush.h> |
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static struct kmem_cache *pgd_cache __ro_after_init; |
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pgd_t *pgd_alloc(struct mm_struct *mm) |
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{ |
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gfp_t gfp = GFP_PGTABLE_USER; |
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if (PGD_SIZE == PAGE_SIZE) |
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return (pgd_t *)__get_free_page(gfp); |
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else |
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return kmem_cache_alloc(pgd_cache, gfp); |
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} |
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void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
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{ |
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if (PGD_SIZE == PAGE_SIZE) |
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free_page((unsigned long)pgd); |
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else |
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kmem_cache_free(pgd_cache, pgd); |
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} |
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void __init pgtable_cache_init(void) |
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{ |
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if (PGD_SIZE == PAGE_SIZE) |
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return; |
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#ifdef CONFIG_ARM64_PA_BITS_52 |
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/* |
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* With 52-bit physical addresses, the architecture requires the |
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* top-level table to be aligned to at least 64 bytes. |
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*/ |
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BUILD_BUG_ON(PGD_SIZE < 64); |
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#endif |
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/* |
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* Naturally aligned pgds required by the architecture. |
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*/ |
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pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE, |
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SLAB_PANIC, NULL); |
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}
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