Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Vineet Gupta | 431 | 93.70% | 3 | 60.00% |
Kirill A. Shutemov | 27 | 5.87% | 1 | 20.00% |
Thomas Gleixner | 2 | 0.43% | 1 | 20.00% |
Total | 460 | 5 |
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * vineetg: June 2011 * -"/proc/meminfo | grep PageTables" kept on increasing * Recently added pgtable dtor was not getting called. * * vineetg: May 2011 * -Variable pg-sz means that Page Tables could be variable sized themselves * So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx] * -Page Table size capped to max 1 to save memory - hence verified. * -Since these deal with constants, gcc compile-time optimizes them. * * vineetg: Nov 2010 * -Added pgtable ctor/dtor used for pgtable mem accounting * * vineetg: April 2010 * -Switched pgtable_t from being struct page * to unsigned long * =Needed so that Page Table allocator (pte_alloc_one) is not forced to * to deal with struct page. Thay way in future we can make it allocate * multiple PG Tbls in one Page Frame * =sweet side effect is avoiding calls to ugly page_address( ) from the * pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate * * Amit Bhor, Sameer Dhavale: Codito Technologies 2004 */ #ifndef _ASM_ARC_PGALLOC_H #define _ASM_ARC_PGALLOC_H #include <linux/mm.h> #include <linux/log2.h> static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) { pmd_set(pmd, pte); } static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep) { pmd_set(pmd, (pte_t *) ptep); } static inline int __get_order_pgd(void) { return get_order(PTRS_PER_PGD * sizeof(pgd_t)); } static inline pgd_t *pgd_alloc(struct mm_struct *mm) { int num, num2; pgd_t *ret = (pgd_t *) __get_free_pages(GFP_KERNEL, __get_order_pgd()); if (ret) { num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE; memzero(ret, num * sizeof(pgd_t)); num2 = VMALLOC_SIZE / PGDIR_SIZE; memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t)); memzero(ret + num + num2, (PTRS_PER_PGD - num - num2) * sizeof(pgd_t)); } return ret; } static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) { free_pages((unsigned long)pgd, __get_order_pgd()); } /* * With software-only page-tables, addr-split for traversal is tweakable and * that directly governs how big tables would be at each level. * Further, the MMU page size is configurable. * Thus we need to programatically assert the size constraint * All of this is const math, allowing gcc to do constant folding/propagation. */ static inline int __get_order_pte(void) { return get_order(PTRS_PER_PTE * sizeof(pte_t)); } static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) { pte_t *pte; pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, __get_order_pte()); return pte; } static inline pgtable_t pte_alloc_one(struct mm_struct *mm) { pgtable_t pte_pg; struct page *page; pte_pg = (pgtable_t)__get_free_pages(GFP_KERNEL, __get_order_pte()); if (!pte_pg) return 0; memzero((void *)pte_pg, PTRS_PER_PTE * sizeof(pte_t)); page = virt_to_page(pte_pg); if (!pgtable_page_ctor(page)) { __free_page(page); return 0; } return pte_pg; } static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { free_pages((unsigned long)pte, __get_order_pte()); /* takes phy addr */ } static inline void pte_free(struct mm_struct *mm, pgtable_t ptep) { pgtable_page_dtor(virt_to_page(ptep)); free_pages((unsigned long)ptep, __get_order_pte()); } #define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) #define check_pgt_cache() do { } while (0) #define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd)) #endif /* _ASM_ARC_PGALLOC_H */
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