1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 21965aae3SH. Peter Anvin #ifndef _ASM_X86_PGALLOC_H 31965aae3SH. Peter Anvin #define _ASM_X86_PGALLOC_H 4bb898558SAl Viro 5bb898558SAl Viro #include <linux/threads.h> 6bb898558SAl Viro #include <linux/mm.h> /* for struct page */ 7bb898558SAl Viro #include <linux/pagemap.h> 8bb898558SAl Viro 95fba4af4SMike Rapoport #define __HAVE_ARCH_PTE_ALLOC_ONE 101355c31eSMike Rapoport #include <asm-generic/pgalloc.h> 115fba4af4SMike Rapoport 12bb898558SAl Viro static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; } 13bb898558SAl Viro 14fdc0269eSJuergen Gross #ifdef CONFIG_PARAVIRT_XXL 15bb898558SAl Viro #include <asm/paravirt.h> 16bb898558SAl Viro #else 17bb898558SAl Viro #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm) 18bb898558SAl Viro static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} 19bb898558SAl Viro static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} 20bb898558SAl Viro static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} 21bb898558SAl Viro static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, 22bb898558SAl Viro unsigned long start, unsigned long count) {} 23bb898558SAl Viro static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} 24335437fbSKirill A. Shutemov static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {} 25bb898558SAl Viro static inline void paravirt_release_pte(unsigned long pfn) {} 26bb898558SAl Viro static inline void paravirt_release_pmd(unsigned long pfn) {} 27bb898558SAl Viro static inline void paravirt_release_pud(unsigned long pfn) {} 28335437fbSKirill A. Shutemov static inline void paravirt_release_p4d(unsigned long pfn) {} 29bb898558SAl Viro #endif 30bb898558SAl Viro 31bb898558SAl Viro /* 3214315592SIan Campbell * Flags to use when allocating a user page table page. 3314315592SIan Campbell */ 3414315592SIan Campbell extern gfp_t __userpte_alloc_gfp; 3514315592SIan Campbell 36d9e9a641SDave Hansen #ifdef CONFIG_PAGE_TABLE_ISOLATION 37d9e9a641SDave Hansen /* 38d9e9a641SDave Hansen * Instead of one PGD, we acquire two PGDs. Being order-1, it is 39d9e9a641SDave Hansen * both 8k in size and 8k-aligned. That lets us just flip bit 12 40d9e9a641SDave Hansen * in a pointer to swap between the two 4k halves. 41d9e9a641SDave Hansen */ 42d9e9a641SDave Hansen #define PGD_ALLOCATION_ORDER 1 43d9e9a641SDave Hansen #else 44d9e9a641SDave Hansen #define PGD_ALLOCATION_ORDER 0 45d9e9a641SDave Hansen #endif 46d9e9a641SDave Hansen 4714315592SIan Campbell /* 48bb898558SAl Viro * Allocate and free page tables. 49bb898558SAl Viro */ 50bb898558SAl Viro extern pgd_t *pgd_alloc(struct mm_struct *); 51bb898558SAl Viro extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 52bb898558SAl Viro 534cf58924SJoel Fernandes (Google) extern pgtable_t pte_alloc_one(struct mm_struct *); 54bb898558SAl Viro 559e1b32caSBenjamin Herrenschmidt extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte); 569e1b32caSBenjamin Herrenschmidt 579e1b32caSBenjamin Herrenschmidt static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, 589e1b32caSBenjamin Herrenschmidt unsigned long address) 599e1b32caSBenjamin Herrenschmidt { 609e1b32caSBenjamin Herrenschmidt ___pte_free_tlb(tlb, pte); 619e1b32caSBenjamin Herrenschmidt } 62bb898558SAl Viro 63bb898558SAl Viro static inline void pmd_populate_kernel(struct mm_struct *mm, 64bb898558SAl Viro pmd_t *pmd, pte_t *pte) 65bb898558SAl Viro { 66bb898558SAl Viro paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); 67bb898558SAl Viro set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); 68bb898558SAl Viro } 69bb898558SAl Viro 700a9fe8caSDan Williams static inline void pmd_populate_kernel_safe(struct mm_struct *mm, 710a9fe8caSDan Williams pmd_t *pmd, pte_t *pte) 720a9fe8caSDan Williams { 730a9fe8caSDan Williams paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); 740a9fe8caSDan Williams set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); 750a9fe8caSDan Williams } 760a9fe8caSDan Williams 77bb898558SAl Viro static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 78bb898558SAl Viro struct page *pte) 79bb898558SAl Viro { 80bb898558SAl Viro unsigned long pfn = page_to_pfn(pte); 81bb898558SAl Viro 82bb898558SAl Viro paravirt_alloc_pte(mm, pfn); 83bb898558SAl Viro set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); 84bb898558SAl Viro } 85bb898558SAl Viro 86bb898558SAl Viro #define pmd_pgtable(pmd) pmd_page(pmd) 87bb898558SAl Viro 8898233368SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 2 899e1b32caSBenjamin Herrenschmidt extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); 909e1b32caSBenjamin Herrenschmidt 919e1b32caSBenjamin Herrenschmidt static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, 92b595076aSUwe Kleine-König unsigned long address) 939e1b32caSBenjamin Herrenschmidt { 949e1b32caSBenjamin Herrenschmidt ___pmd_free_tlb(tlb, pmd); 959e1b32caSBenjamin Herrenschmidt } 96bb898558SAl Viro 97bb898558SAl Viro #ifdef CONFIG_X86_PAE 98bb898558SAl Viro extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 99bb898558SAl Viro #else /* !CONFIG_X86_PAE */ 100bb898558SAl Viro static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 101bb898558SAl Viro { 102bb898558SAl Viro paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 103bb898558SAl Viro set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); 104bb898558SAl Viro } 1050a9fe8caSDan Williams 1060a9fe8caSDan Williams static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 1070a9fe8caSDan Williams { 1080a9fe8caSDan Williams paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 1090a9fe8caSDan Williams set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd))); 1100a9fe8caSDan Williams } 111bb898558SAl Viro #endif /* CONFIG_X86_PAE */ 112bb898558SAl Viro 11398233368SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 3 114f2a6a705SKirill A. Shutemov static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 115bb898558SAl Viro { 116bb898558SAl Viro paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 117f2a6a705SKirill A. Shutemov set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud))); 118bb898558SAl Viro } 119bb898558SAl Viro 1200a9fe8caSDan Williams static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 1210a9fe8caSDan Williams { 1220a9fe8caSDan Williams paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 1230a9fe8caSDan Williams set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); 1240a9fe8caSDan Williams } 1250a9fe8caSDan Williams 126bb898558SAl Viro static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 127bb898558SAl Viro { 1283e79ec7dSVladimir Davydov gfp_t gfp = GFP_KERNEL_ACCOUNT; 1293e79ec7dSVladimir Davydov 1303e79ec7dSVladimir Davydov if (mm == &init_mm) 1313e79ec7dSVladimir Davydov gfp &= ~__GFP_ACCOUNT; 1323e79ec7dSVladimir Davydov return (pud_t *)get_zeroed_page(gfp); 133bb898558SAl Viro } 134bb898558SAl Viro 135bb898558SAl Viro static inline void pud_free(struct mm_struct *mm, pud_t *pud) 136bb898558SAl Viro { 137bb898558SAl Viro BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 138bb898558SAl Viro free_page((unsigned long)pud); 139bb898558SAl Viro } 140bb898558SAl Viro 1419e1b32caSBenjamin Herrenschmidt extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); 1429e1b32caSBenjamin Herrenschmidt 1439e1b32caSBenjamin Herrenschmidt static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, 1449e1b32caSBenjamin Herrenschmidt unsigned long address) 1459e1b32caSBenjamin Herrenschmidt { 1469e1b32caSBenjamin Herrenschmidt ___pud_free_tlb(tlb, pud); 1479e1b32caSBenjamin Herrenschmidt } 1489e1b32caSBenjamin Herrenschmidt 149f2a6a705SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 4 150f2a6a705SKirill A. Shutemov static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 151f2a6a705SKirill A. Shutemov { 152ed7588d5SKirill A. Shutemov if (!pgtable_l5_enabled()) 15398219ddaSKirill A. Shutemov return; 154f2a6a705SKirill A. Shutemov paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); 155f2a6a705SKirill A. Shutemov set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); 156f2a6a705SKirill A. Shutemov } 157f2a6a705SKirill A. Shutemov 1580a9fe8caSDan Williams static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 1590a9fe8caSDan Williams { 1600a9fe8caSDan Williams if (!pgtable_l5_enabled()) 1610a9fe8caSDan Williams return; 1620a9fe8caSDan Williams paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); 1630a9fe8caSDan Williams set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); 1640a9fe8caSDan Williams } 1650a9fe8caSDan Williams 166f2a6a705SKirill A. Shutemov static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) 167f2a6a705SKirill A. Shutemov { 168f2a6a705SKirill A. Shutemov gfp_t gfp = GFP_KERNEL_ACCOUNT; 169f2a6a705SKirill A. Shutemov 170f2a6a705SKirill A. Shutemov if (mm == &init_mm) 171f2a6a705SKirill A. Shutemov gfp &= ~__GFP_ACCOUNT; 172f2a6a705SKirill A. Shutemov return (p4d_t *)get_zeroed_page(gfp); 173f2a6a705SKirill A. Shutemov } 174f2a6a705SKirill A. Shutemov 175f2a6a705SKirill A. Shutemov static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) 176f2a6a705SKirill A. Shutemov { 1770e311d23SAndrey Ryabinin if (!pgtable_l5_enabled()) 1780e311d23SAndrey Ryabinin return; 1790e311d23SAndrey Ryabinin 180f2a6a705SKirill A. Shutemov BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); 181f2a6a705SKirill A. Shutemov free_page((unsigned long)p4d); 182f2a6a705SKirill A. Shutemov } 183f2a6a705SKirill A. Shutemov 184f2a6a705SKirill A. Shutemov extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); 185f2a6a705SKirill A. Shutemov 186f2a6a705SKirill A. Shutemov static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, 187f2a6a705SKirill A. Shutemov unsigned long address) 188f2a6a705SKirill A. Shutemov { 189ed7588d5SKirill A. Shutemov if (pgtable_l5_enabled()) 190f2a6a705SKirill A. Shutemov ___p4d_free_tlb(tlb, p4d); 191f2a6a705SKirill A. Shutemov } 192f2a6a705SKirill A. Shutemov 193f2a6a705SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 4 */ 19498233368SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 19598233368SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 196bb898558SAl Viro 1971965aae3SH. Peter Anvin #endif /* _ASM_X86_PGALLOC_H */ 198