d9820ff76f
So far ARC pgtable_t has not been struct page based to avoid extra page_address() calls involved. However the differences are down to noise and get in the way of using generic code, hence this patch. This also allows us to reuse generic THP depost/withdraw code. There's some additional consideration for PGDIR_SHIFT in 4K page config. Now due to page tables being PAGE_SIZE deep only, the address split can't be really arbitrary. Tested-by: kernel test robot <lkp@intel.com> Suggested-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* vineetg: June 2011
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* -"/proc/meminfo | grep PageTables" kept on increasing
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* Recently added pgtable dtor was not getting called.
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*
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* vineetg: May 2011
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* -Variable pg-sz means that Page Tables could be variable sized themselves
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* So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
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* -Page Table size capped to max 1 to save memory - hence verified.
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* -Since these deal with constants, gcc compile-time optimizes them.
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*
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* vineetg: Nov 2010
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* -Added pgtable ctor/dtor used for pgtable mem accounting
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*
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* vineetg: April 2010
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* -Switched pgtable_t from being struct page * to unsigned long
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* =Needed so that Page Table allocator (pte_alloc_one) is not forced to
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* deal with struct page. That way in future we can make it allocate
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* multiple PG Tbls in one Page Frame
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* =sweet side effect is avoiding calls to ugly page_address( ) from the
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* pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate)
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*
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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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*/
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#ifndef _ASM_ARC_PGALLOC_H
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#define _ASM_ARC_PGALLOC_H
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#include <linux/mm.h>
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#include <linux/log2.h>
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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{
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/*
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* The cast to long below is OK in 32-bit PAE40 regime with long long pte
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* Despite "wider" pte, the pte table needs to be in non-PAE low memory
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* as all higher levels can only hold long pointers.
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*
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* The cast itself is needed given simplistic definition of set_pmd()
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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, pgtable_t pte_page)
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{
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set_pmd(pmd, __pmd((unsigned long)page_address(pte_page)));
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *ret = (pgd_t *) __get_free_page(GFP_KERNEL);
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if (ret) {
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int num, num2;
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num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
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memzero(ret, num * sizeof(pgd_t));
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num2 = VMALLOC_SIZE / PGDIR_SIZE;
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memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
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memzero(ret + num + num2,
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(PTRS_PER_PGD - num - num2) * sizeof(pgd_t));
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}
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return ret;
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}
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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_page((unsigned long)pgd);
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}
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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pte_t *pte;
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pte = (pte_t *) __get_free_page(GFP_KERNEL | __GFP_ZERO);
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return pte;
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}
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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{
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struct page *page;
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page = (pgtable_t)alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
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if (!page)
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return NULL;
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if (!pgtable_pte_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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return page;
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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_page((unsigned long)pte);
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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t pte_page)
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{
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pgtable_pte_page_dtor(pte_page);
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__free_page(pte_page);
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}
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#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
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#endif /* _ASM_ARC_PGALLOC_H */
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