228 lines
6.0 KiB
C
228 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_PGALLOC_H
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#define __ASM_GENERIC_PGALLOC_H
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#ifdef CONFIG_MMU
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#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
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#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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/**
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* __pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation.
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *__pte_alloc_one_kernel_noprof(struct mm_struct *mm)
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{
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struct ptdesc *ptdesc = pagetable_alloc_noprof(GFP_PGTABLE_KERNEL &
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~__GFP_HIGHMEM, 0);
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if (!ptdesc)
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return NULL;
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return ptdesc_address(ptdesc);
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}
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#define __pte_alloc_one_kernel(...) alloc_hooks(__pte_alloc_one_kernel_noprof(__VA_ARGS__))
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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/**
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* pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *pte_alloc_one_kernel_noprof(struct mm_struct *mm)
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{
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return __pte_alloc_one_kernel_noprof(mm);
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}
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#define pte_alloc_one_kernel(...) alloc_hooks(pte_alloc_one_kernel_noprof(__VA_ARGS__))
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#endif
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/**
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* pte_free_kernel - free PTE-level kernel page table memory
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* @mm: the mm_struct of the current context
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* @pte: pointer to the memory containing the page 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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pagetable_free(virt_to_ptdesc(pte));
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}
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/**
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* __pte_alloc_one - allocate memory for a PTE-level user page table
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* @mm: the mm_struct of the current context
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* @gfp: GFP flags to use for the allocation
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*
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* Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation or must have custom GFP flags.
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*
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* Return: `struct page` referencing the ptdesc or %NULL on error
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*/
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static inline pgtable_t __pte_alloc_one_noprof(struct mm_struct *mm, gfp_t gfp)
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{
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struct ptdesc *ptdesc;
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ptdesc = pagetable_alloc_noprof(gfp, 0);
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if (!ptdesc)
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return NULL;
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if (!pagetable_pte_ctor(ptdesc)) {
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pagetable_free(ptdesc);
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return NULL;
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}
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return ptdesc_page(ptdesc);
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}
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#define __pte_alloc_one(...) alloc_hooks(__pte_alloc_one_noprof(__VA_ARGS__))
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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/**
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* pte_alloc_one - allocate a page for PTE-level user page table
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* @mm: the mm_struct of the current context
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*
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* Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
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*
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* Return: `struct page` referencing the ptdesc or %NULL on error
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*/
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static inline pgtable_t pte_alloc_one_noprof(struct mm_struct *mm)
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{
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return __pte_alloc_one_noprof(mm, GFP_PGTABLE_USER);
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}
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#define pte_alloc_one(...) alloc_hooks(pte_alloc_one_noprof(__VA_ARGS__))
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#endif
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/*
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* Should really implement gc for free page table pages. This could be
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* done with a reference count in struct page.
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*/
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/**
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* pte_free - free PTE-level user page table memory
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* @mm: the mm_struct of the current context
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* @pte_page: the `struct page` referencing the ptdesc
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*/
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static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
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{
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struct ptdesc *ptdesc = page_ptdesc(pte_page);
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pagetable_pte_dtor(ptdesc);
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pagetable_free(ptdesc);
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}
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#if CONFIG_PGTABLE_LEVELS > 2
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#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
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/**
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* pmd_alloc_one - allocate memory for a PMD-level page table
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* @mm: the mm_struct of the current context
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*
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* Allocate memory for a page table and ptdesc and runs pagetable_pmd_ctor().
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*
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* Allocations use %GFP_PGTABLE_USER in user context and
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* %GFP_PGTABLE_KERNEL in kernel context.
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
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{
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struct ptdesc *ptdesc;
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gfp_t gfp = GFP_PGTABLE_USER;
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if (mm == &init_mm)
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gfp = GFP_PGTABLE_KERNEL;
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ptdesc = pagetable_alloc_noprof(gfp, 0);
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if (!ptdesc)
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return NULL;
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if (!pagetable_pmd_ctor(ptdesc)) {
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pagetable_free(ptdesc);
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return NULL;
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}
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return ptdesc_address(ptdesc);
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}
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#define pmd_alloc_one(...) alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
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#endif
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#ifndef __HAVE_ARCH_PMD_FREE
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
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BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
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pagetable_pmd_dtor(ptdesc);
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pagetable_free(ptdesc);
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}
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#endif
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#endif /* CONFIG_PGTABLE_LEVELS > 2 */
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#if CONFIG_PGTABLE_LEVELS > 3
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static inline pud_t *__pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
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{
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gfp_t gfp = GFP_PGTABLE_USER;
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struct ptdesc *ptdesc;
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if (mm == &init_mm)
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gfp = GFP_PGTABLE_KERNEL;
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gfp &= ~__GFP_HIGHMEM;
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ptdesc = pagetable_alloc_noprof(gfp, 0);
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if (!ptdesc)
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return NULL;
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pagetable_pud_ctor(ptdesc);
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return ptdesc_address(ptdesc);
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}
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#define __pud_alloc_one(...) alloc_hooks(__pud_alloc_one_noprof(__VA_ARGS__))
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#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
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/**
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* pud_alloc_one - allocate memory for a PUD-level page table
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* @mm: the mm_struct of the current context
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*
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* Allocate memory for a page table using %GFP_PGTABLE_USER for user context
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* and %GFP_PGTABLE_KERNEL for kernel context.
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pud_t *pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
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{
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return __pud_alloc_one_noprof(mm, addr);
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}
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#define pud_alloc_one(...) alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
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#endif
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static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
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{
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struct ptdesc *ptdesc = virt_to_ptdesc(pud);
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BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
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pagetable_pud_dtor(ptdesc);
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pagetable_free(ptdesc);
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}
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#ifndef __HAVE_ARCH_PUD_FREE
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static inline void pud_free(struct mm_struct *mm, pud_t *pud)
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{
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__pud_free(mm, pud);
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}
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#endif
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#endif /* CONFIG_PGTABLE_LEVELS > 3 */
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#ifndef __HAVE_ARCH_PGD_FREE
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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pagetable_free(virt_to_ptdesc(pgd));
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}
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#endif
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#endif /* CONFIG_MMU */
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#endif /* __ASM_GENERIC_PGALLOC_H */
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