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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3377e227af
Some users must have 4K pages while needing a 48-bit VA space size. The cleanest way do do this is to go to a 4-level page table for this case. Each page table level using order-0 pages adds 9 bits to the VA size (at 4K pages, so for four levels we get 9 * 4 + 12 == 48-bits. For the 4K page size case only we add support functions for the PUD level of the page table tree, also the TLB exception handlers get an extra level of tree walk. [david.daney@cavium.com: Forward port to v4.10.] [david.daney@cavium.com: Forward port to v4.11.] Signed-off-by: Alex Belits <alex.belits@cavium.com> Signed-off-by: David Daney <david.daney@cavium.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Alex Belits <alex.belits@cavium.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/15312/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 2001, 2003 by Ralf Baechle
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_PGALLOC_H
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#define _ASM_PGALLOC_H
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
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pte_t *pte)
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{
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set_pmd(pmd, __pmd((unsigned long)pte));
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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pgtable_t pte)
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{
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set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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/*
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* Initialize a new pmd table with invalid pointers.
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*/
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extern void pmd_init(unsigned long page, unsigned long pagetable);
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#ifndef __PAGETABLE_PMD_FOLDED
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static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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set_pud(pud, __pud((unsigned long)pmd));
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}
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#endif
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/*
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* Initialize a new pgd / pmd table with invalid pointers.
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*/
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extern void pgd_init(unsigned long page);
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extern pgd_t *pgd_alloc(struct mm_struct *mm);
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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free_pages((unsigned long)pgd, PGD_ORDER);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long address)
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{
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struct page *pte;
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pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
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if (!pte)
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return NULL;
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clear_highpage(pte);
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if (!pgtable_page_ctor(pte)) {
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__free_page(pte);
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return NULL;
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}
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return pte;
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}
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_pages((unsigned long)pte, PTE_ORDER);
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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
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{
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pgtable_page_dtor(pte);
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__free_pages(pte, PTE_ORDER);
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}
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#define __pte_free_tlb(tlb,pte,address) \
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do { \
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pgtable_page_dtor(pte); \
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tlb_remove_page((tlb), pte); \
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} while (0)
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#ifndef __PAGETABLE_PMD_FOLDED
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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pmd_t *pmd;
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pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, PMD_ORDER);
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if (pmd)
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pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
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return pmd;
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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free_pages((unsigned long)pmd, PMD_ORDER);
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}
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#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
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#endif
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#ifndef __PAGETABLE_PUD_FOLDED
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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pud_t *pud;
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pud = (pud_t *) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, PUD_ORDER);
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if (pud)
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pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
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return pud;
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}
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static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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{
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free_pages((unsigned long)pud, PUD_ORDER);
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
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{
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set_pgd(pgd, __pgd((unsigned long)pud));
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}
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#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x)
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#endif /* __PAGETABLE_PUD_FOLDED */
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#define check_pgt_cache() do { } while (0)
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extern void pagetable_init(void);
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#endif /* _ASM_PGALLOC_H */
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