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![Martin Schwidefsky](/assets/img/avatar_default.png)
Background: I've implemented 1K/2K page tables for s390. These sub-page page tables are required to properly support the s390 virtualization instruction with KVM. The SIE instruction requires that the page tables have 256 page table entries (pte) followed by 256 page status table entries (pgste). The pgstes are only required if the process is using the SIE instruction. The pgstes are updated by the hardware and by the hypervisor for a number of reasons, one of them is dirty and reference bit tracking. To avoid wasting memory the standard pte table allocation should return 1K/2K (31/64 bit) and 2K/4K if the process is using SIE. Problem: Page size on s390 is 4K, page table size is 1K or 2K. That means the s390 version for pte_alloc_one cannot return a pointer to a struct page. Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one cannot return a pointer to a pte either, since that would require more than 32 bit for the return value of pte_alloc_one (and the pte * would not be accessible since its not kmapped). Solution: The only solution I found to this dilemma is a new typedef: a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced with a later patch. For everybody else it will be a (struct page *). The additional problem with the initialization of the ptl lock and the NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and a destructor pgtable_page_dtor. The page table allocation and free functions need to call these two whenever a page table page is allocated or freed. pmd_populate will get a pgtable_t instead of a struct page pointer. To get the pgtable_t back from a pmd entry that has been installed with pmd_populate a new function pmd_pgtable is added. It replaces the pmd_page call in free_pte_range and apply_to_pte_range. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* linux/include/asm-arm/pgalloc.h
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*
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* Copyright (C) 2000-2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASMARM_PGALLOC_H
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#define _ASMARM_PGALLOC_H
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#include <asm/domain.h>
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#include <asm/pgtable-hwdef.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#define check_pgt_cache() do { } while (0)
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#ifdef CONFIG_MMU
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#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
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#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
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/*
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* Since we have only two-level page tables, these are trivial
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*/
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#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(mm, pmd) do { } while (0)
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#define pgd_populate(mm,pmd,pte) BUG()
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extern pgd_t *get_pgd_slow(struct mm_struct *mm);
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extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
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#define pgd_alloc(mm) get_pgd_slow(mm)
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#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
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/*
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* Allocate one PTE table.
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*
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* This actually allocates two hardware PTE tables, but we wrap this up
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* into one table thus:
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*
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* +------------+
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* | h/w pt 0 |
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* +------------+
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* | h/w pt 1 |
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* +------------+
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* | Linux pt 0 |
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* +------------+
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* | Linux pt 1 |
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* +------------+
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*/
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
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{
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pte_t *pte;
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pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
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if (pte) {
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clean_dcache_area(pte, sizeof(pte_t) * PTRS_PER_PTE);
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pte += PTRS_PER_PTE;
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}
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return pte;
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}
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static inline pgtable_t
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pte_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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struct page *pte;
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pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
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if (pte) {
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void *page = page_address(pte);
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clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
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pgtable_page_ctor(pte);
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}
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return pte;
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}
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/*
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* Free one PTE table.
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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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if (pte) {
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pte -= PTRS_PER_PTE;
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free_page((unsigned long)pte);
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}
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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_page(pte);
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}
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static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
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{
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pmdp[0] = __pmd(pmdval);
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pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
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flush_pmd_entry(pmdp);
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}
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/*
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* Populate the pmdp entry with a pointer to the pte. This pmd is part
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* of the mm address space.
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*
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* Ensure that we always set both PMD entries.
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*/
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
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{
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unsigned long pte_ptr = (unsigned long)ptep;
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/*
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* The pmd must be loaded with the physical
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* address of the PTE table
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*/
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pte_ptr -= PTRS_PER_PTE * sizeof(void *);
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__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
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{
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__pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif /* CONFIG_MMU */
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#endif
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