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 9bb898558SAl Viro static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; } 10bb898558SAl Viro 11bb898558SAl Viro #ifdef CONFIG_PARAVIRT 12bb898558SAl Viro #include <asm/paravirt.h> 13bb898558SAl Viro #else 14bb898558SAl Viro #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm) 15bb898558SAl Viro static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} 16bb898558SAl Viro static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} 17bb898558SAl Viro static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} 18bb898558SAl Viro static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, 19bb898558SAl Viro unsigned long start, unsigned long count) {} 20bb898558SAl Viro static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} 21335437fbSKirill A. Shutemov static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {} 22bb898558SAl Viro static inline void paravirt_release_pte(unsigned long pfn) {} 23bb898558SAl Viro static inline void paravirt_release_pmd(unsigned long pfn) {} 24bb898558SAl Viro static inline void paravirt_release_pud(unsigned long pfn) {} 25335437fbSKirill A. Shutemov static inline void paravirt_release_p4d(unsigned long pfn) {} 26bb898558SAl Viro #endif 27bb898558SAl Viro 28bb898558SAl Viro /* 2914315592SIan Campbell * Flags to use when allocating a user page table page. 3014315592SIan Campbell */ 3114315592SIan Campbell extern gfp_t __userpte_alloc_gfp; 3214315592SIan Campbell 3314315592SIan Campbell /* 34bb898558SAl Viro * Allocate and free page tables. 35bb898558SAl Viro */ 36bb898558SAl Viro extern pgd_t *pgd_alloc(struct mm_struct *); 37bb898558SAl Viro extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 38bb898558SAl Viro 39bb898558SAl Viro extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long); 40bb898558SAl Viro extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long); 41bb898558SAl Viro 42bb898558SAl Viro /* Should really implement gc for free page table pages. This could be 43bb898558SAl Viro done with a reference count in struct page. */ 44bb898558SAl Viro 45bb898558SAl Viro static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 46bb898558SAl Viro { 47bb898558SAl Viro BUG_ON((unsigned long)pte & (PAGE_SIZE-1)); 48bb898558SAl Viro free_page((unsigned long)pte); 49bb898558SAl Viro } 50bb898558SAl Viro 51bb898558SAl Viro static inline void pte_free(struct mm_struct *mm, struct page *pte) 52bb898558SAl Viro { 5342ef73feSPeter Zijlstra pgtable_page_dtor(pte); 54bb898558SAl Viro __free_page(pte); 55bb898558SAl Viro } 56bb898558SAl Viro 579e1b32caSBenjamin Herrenschmidt extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte); 589e1b32caSBenjamin Herrenschmidt 599e1b32caSBenjamin Herrenschmidt static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, 609e1b32caSBenjamin Herrenschmidt unsigned long address) 619e1b32caSBenjamin Herrenschmidt { 629e1b32caSBenjamin Herrenschmidt ___pte_free_tlb(tlb, pte); 639e1b32caSBenjamin Herrenschmidt } 64bb898558SAl Viro 65bb898558SAl Viro static inline void pmd_populate_kernel(struct mm_struct *mm, 66bb898558SAl Viro pmd_t *pmd, pte_t *pte) 67bb898558SAl Viro { 68bb898558SAl Viro paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); 69bb898558SAl Viro set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); 70bb898558SAl Viro } 71bb898558SAl Viro 72bb898558SAl Viro static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 73bb898558SAl Viro struct page *pte) 74bb898558SAl Viro { 75bb898558SAl Viro unsigned long pfn = page_to_pfn(pte); 76bb898558SAl Viro 77bb898558SAl Viro paravirt_alloc_pte(mm, pfn); 78bb898558SAl Viro set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); 79bb898558SAl Viro } 80bb898558SAl Viro 81bb898558SAl Viro #define pmd_pgtable(pmd) pmd_page(pmd) 82bb898558SAl Viro 8398233368SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 2 84bb898558SAl Viro static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 85bb898558SAl Viro { 869491846fSKirill A. Shutemov struct page *page; 873e79ec7dSVladimir Davydov gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; 883e79ec7dSVladimir Davydov 893e79ec7dSVladimir Davydov if (mm == &init_mm) 903e79ec7dSVladimir Davydov gfp &= ~__GFP_ACCOUNT; 913e79ec7dSVladimir Davydov page = alloc_pages(gfp, 0); 929491846fSKirill A. Shutemov if (!page) 939491846fSKirill A. Shutemov return NULL; 949491846fSKirill A. Shutemov if (!pgtable_pmd_page_ctor(page)) { 959491846fSKirill A. Shutemov __free_pages(page, 0); 969491846fSKirill A. Shutemov return NULL; 979491846fSKirill A. Shutemov } 989491846fSKirill A. Shutemov return (pmd_t *)page_address(page); 99bb898558SAl Viro } 100bb898558SAl Viro 101bb898558SAl Viro static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 102bb898558SAl Viro { 103bb898558SAl Viro BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); 1049491846fSKirill A. Shutemov pgtable_pmd_page_dtor(virt_to_page(pmd)); 105bb898558SAl Viro free_page((unsigned long)pmd); 106bb898558SAl Viro } 107bb898558SAl Viro 1089e1b32caSBenjamin Herrenschmidt extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); 1099e1b32caSBenjamin Herrenschmidt 1109e1b32caSBenjamin Herrenschmidt static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, 111b595076aSUwe Kleine-König unsigned long address) 1129e1b32caSBenjamin Herrenschmidt { 1139e1b32caSBenjamin Herrenschmidt ___pmd_free_tlb(tlb, pmd); 1149e1b32caSBenjamin Herrenschmidt } 115bb898558SAl Viro 116bb898558SAl Viro #ifdef CONFIG_X86_PAE 117bb898558SAl Viro extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 118bb898558SAl Viro #else /* !CONFIG_X86_PAE */ 119bb898558SAl Viro static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 120bb898558SAl Viro { 121bb898558SAl Viro paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 122bb898558SAl Viro set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); 123bb898558SAl Viro } 124bb898558SAl Viro #endif /* CONFIG_X86_PAE */ 125bb898558SAl Viro 12698233368SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 3 127f2a6a705SKirill A. Shutemov static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 128bb898558SAl Viro { 129bb898558SAl Viro paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 130f2a6a705SKirill A. Shutemov set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud))); 131bb898558SAl Viro } 132bb898558SAl Viro 133bb898558SAl Viro static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 134bb898558SAl Viro { 1353e79ec7dSVladimir Davydov gfp_t gfp = GFP_KERNEL_ACCOUNT; 1363e79ec7dSVladimir Davydov 1373e79ec7dSVladimir Davydov if (mm == &init_mm) 1383e79ec7dSVladimir Davydov gfp &= ~__GFP_ACCOUNT; 1393e79ec7dSVladimir Davydov return (pud_t *)get_zeroed_page(gfp); 140bb898558SAl Viro } 141bb898558SAl Viro 142bb898558SAl Viro static inline void pud_free(struct mm_struct *mm, pud_t *pud) 143bb898558SAl Viro { 144bb898558SAl Viro BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 145bb898558SAl Viro free_page((unsigned long)pud); 146bb898558SAl Viro } 147bb898558SAl Viro 1489e1b32caSBenjamin Herrenschmidt extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); 1499e1b32caSBenjamin Herrenschmidt 1509e1b32caSBenjamin Herrenschmidt static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, 1519e1b32caSBenjamin Herrenschmidt unsigned long address) 1529e1b32caSBenjamin Herrenschmidt { 1539e1b32caSBenjamin Herrenschmidt ___pud_free_tlb(tlb, pud); 1549e1b32caSBenjamin Herrenschmidt } 1559e1b32caSBenjamin Herrenschmidt 156f2a6a705SKirill A. Shutemov #if CONFIG_PGTABLE_LEVELS > 4 157f2a6a705SKirill A. Shutemov static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 158f2a6a705SKirill A. Shutemov { 159f2a6a705SKirill A. Shutemov paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); 160f2a6a705SKirill A. Shutemov set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); 161f2a6a705SKirill A. Shutemov } 162f2a6a705SKirill A. Shutemov 163f2a6a705SKirill A. Shutemov static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) 164f2a6a705SKirill A. Shutemov { 165f2a6a705SKirill A. Shutemov gfp_t gfp = GFP_KERNEL_ACCOUNT; 166f2a6a705SKirill A. Shutemov 167f2a6a705SKirill A. Shutemov if (mm == &init_mm) 168f2a6a705SKirill A. Shutemov gfp &= ~__GFP_ACCOUNT; 169f2a6a705SKirill A. Shutemov return (p4d_t *)get_zeroed_page(gfp); 170f2a6a705SKirill A. Shutemov } 171f2a6a705SKirill A. Shutemov 172f2a6a705SKirill A. Shutemov static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) 173f2a6a705SKirill A. Shutemov { 174f2a6a705SKirill A. Shutemov BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); 175f2a6a705SKirill A. Shutemov free_page((unsigned long)p4d); 176f2a6a705SKirill A. Shutemov } 177f2a6a705SKirill A. Shutemov 178f2a6a705SKirill A. Shutemov extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); 179f2a6a705SKirill A. Shutemov 180f2a6a705SKirill A. Shutemov static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, 181f2a6a705SKirill A. Shutemov unsigned long address) 182f2a6a705SKirill A. Shutemov { 183f2a6a705SKirill A. Shutemov ___p4d_free_tlb(tlb, p4d); 184f2a6a705SKirill A. Shutemov } 185f2a6a705SKirill A. Shutemov 186f2a6a705SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 4 */ 18798233368SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 18898233368SKirill A. Shutemov #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 189bb898558SAl Viro 1901965aae3SH. Peter Anvin #endif /* _ASM_X86_PGALLOC_H */ 191