| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_X86_PGALLOC_H |
| #define _ASM_X86_PGALLOC_H |
| |
| #include <linux/threads.h> |
| #include <linux/mm.h> /* for struct page */ |
| #include <linux/pagemap.h> |
| |
| static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; } |
| |
| #ifdef CONFIG_PARAVIRT_XXL |
| #include <asm/paravirt.h> |
| #else |
| #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm) |
| static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} |
| static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} |
| static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} |
| static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, |
| unsigned long start, unsigned long count) {} |
| static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} |
| static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {} |
| static inline void paravirt_release_pte(unsigned long pfn) {} |
| static inline void paravirt_release_pmd(unsigned long pfn) {} |
| static inline void paravirt_release_pud(unsigned long pfn) {} |
| static inline void paravirt_release_p4d(unsigned long pfn) {} |
| #endif |
| |
| /* |
| * Flags to use when allocating a user page table page. |
| */ |
| extern gfp_t __userpte_alloc_gfp; |
| |
| #ifdef CONFIG_PAGE_TABLE_ISOLATION |
| /* |
| * Instead of one PGD, we acquire two PGDs. Being order-1, it is |
| * both 8k in size and 8k-aligned. That lets us just flip bit 12 |
| * in a pointer to swap between the two 4k halves. |
| */ |
| #define PGD_ALLOCATION_ORDER 1 |
| #else |
| #define PGD_ALLOCATION_ORDER 0 |
| #endif |
| |
| /* |
| * Allocate and free page tables. |
| */ |
| extern pgd_t *pgd_alloc(struct mm_struct *); |
| extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); |
| |
| extern pte_t *pte_alloc_one_kernel(struct mm_struct *); |
| extern pgtable_t pte_alloc_one(struct mm_struct *); |
| |
| /* Should really implement gc for free page table pages. This could be |
| done with a reference count in struct page. */ |
| |
| static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
| { |
| BUG_ON((unsigned long)pte & (PAGE_SIZE-1)); |
| free_page((unsigned long)pte); |
| } |
| |
| static inline void pte_free(struct mm_struct *mm, struct page *pte) |
| { |
| pgtable_page_dtor(pte); |
| __free_page(pte); |
| } |
| |
| extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte); |
| |
| static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, |
| unsigned long address) |
| { |
| ___pte_free_tlb(tlb, pte); |
| } |
| |
| static inline void pmd_populate_kernel(struct mm_struct *mm, |
| pmd_t *pmd, pte_t *pte) |
| { |
| paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); |
| set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); |
| } |
| |
| static inline void pmd_populate_kernel_safe(struct mm_struct *mm, |
| pmd_t *pmd, pte_t *pte) |
| { |
| paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); |
| set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); |
| } |
| |
| static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
| struct page *pte) |
| { |
| unsigned long pfn = page_to_pfn(pte); |
| |
| paravirt_alloc_pte(mm, pfn); |
| set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); |
| } |
| |
| #define pmd_pgtable(pmd) pmd_page(pmd) |
| |
| #if CONFIG_PGTABLE_LEVELS > 2 |
| static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| struct page *page; |
| gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; |
| |
| if (mm == &init_mm) |
| gfp &= ~__GFP_ACCOUNT; |
| page = alloc_pages(gfp, 0); |
| if (!page) |
| return NULL; |
| if (!pgtable_pmd_page_ctor(page)) { |
| __free_pages(page, 0); |
| return NULL; |
| } |
| return (pmd_t *)page_address(page); |
| } |
| |
| static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) |
| { |
| BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); |
| pgtable_pmd_page_dtor(virt_to_page(pmd)); |
| free_page((unsigned long)pmd); |
| } |
| |
| extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); |
| |
| static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, |
| unsigned long address) |
| { |
| ___pmd_free_tlb(tlb, pmd); |
| } |
| |
| #ifdef CONFIG_X86_PAE |
| extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); |
| #else /* !CONFIG_X86_PAE */ |
| static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
| { |
| paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); |
| set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); |
| } |
| |
| static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) |
| { |
| paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); |
| set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd))); |
| } |
| #endif /* CONFIG_X86_PAE */ |
| |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) |
| { |
| paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); |
| set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud))); |
| } |
| |
| static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) |
| { |
| paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); |
| set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); |
| } |
| |
| static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| gfp_t gfp = GFP_KERNEL_ACCOUNT; |
| |
| if (mm == &init_mm) |
| gfp &= ~__GFP_ACCOUNT; |
| return (pud_t *)get_zeroed_page(gfp); |
| } |
| |
| static inline void pud_free(struct mm_struct *mm, pud_t *pud) |
| { |
| BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); |
| free_page((unsigned long)pud); |
| } |
| |
| extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); |
| |
| static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, |
| unsigned long address) |
| { |
| ___pud_free_tlb(tlb, pud); |
| } |
| |
| #if CONFIG_PGTABLE_LEVELS > 4 |
| static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) |
| { |
| if (!pgtable_l5_enabled()) |
| return; |
| paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); |
| set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); |
| } |
| |
| static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) |
| { |
| if (!pgtable_l5_enabled()) |
| return; |
| paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); |
| set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); |
| } |
| |
| static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) |
| { |
| gfp_t gfp = GFP_KERNEL_ACCOUNT; |
| |
| if (mm == &init_mm) |
| gfp &= ~__GFP_ACCOUNT; |
| return (p4d_t *)get_zeroed_page(gfp); |
| } |
| |
| static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) |
| { |
| if (!pgtable_l5_enabled()) |
| return; |
| |
| BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); |
| free_page((unsigned long)p4d); |
| } |
| |
| extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); |
| |
| static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, |
| unsigned long address) |
| { |
| if (pgtable_l5_enabled()) |
| ___p4d_free_tlb(tlb, p4d); |
| } |
| |
| #endif /* CONFIG_PGTABLE_LEVELS > 4 */ |
| #endif /* CONFIG_PGTABLE_LEVELS > 3 */ |
| #endif /* CONFIG_PGTABLE_LEVELS > 2 */ |
| |
| #endif /* _ASM_X86_PGALLOC_H */ |
