diff options
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/pgalloc.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgalloc.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h new file mode 100644 index 000000000..dd2cff53a --- /dev/null +++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h @@ -0,0 +1,183 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H +#define _ASM_POWERPC_BOOK3S_64_PGALLOC_H +/* + */ + +#include <linux/slab.h> +#include <linux/cpumask.h> +#include <linux/kmemleak.h> +#include <linux/percpu.h> + +struct vmemmap_backing { + struct vmemmap_backing *list; + unsigned long phys; + unsigned long virt_addr; +}; +extern struct vmemmap_backing *vmemmap_list; + +extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long); +extern void pmd_fragment_free(unsigned long *); +extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); +extern void __tlb_remove_table(void *_table); +void pte_frag_destroy(void *pte_frag); + +static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm) +{ +#ifdef CONFIG_PPC_64K_PAGES + return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP)); +#else + struct page *page; + page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL), + 4); + if (!page) + return NULL; + return (pgd_t *) page_address(page); +#endif +} + +static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ +#ifdef CONFIG_PPC_64K_PAGES + free_page((unsigned long)pgd); +#else + free_pages((unsigned long)pgd, 4); +#endif +} + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *pgd; + + if (radix_enabled()) + return radix__pgd_alloc(mm); + + pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), + pgtable_gfp_flags(mm, GFP_KERNEL)); + if (unlikely(!pgd)) + return pgd; + + /* + * Don't scan the PGD for pointers, it contains references to PUDs but + * those references are not full pointers and so can't be recognised by + * kmemleak. + */ + kmemleak_no_scan(pgd); + + /* + * With hugetlb, we don't clear the second half of the page table. + * If we share the same slab cache with the pmd or pud level table, + * we need to make sure we zero out the full table on alloc. + * With 4K we don't store slot in the second half. Hence we don't + * need to do this for 4k. + */ +#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \ + (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX) + memset(pgd, 0, PGD_TABLE_SIZE); +#endif + return pgd; +} + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + if (radix_enabled()) + return radix__pgd_free(mm, pgd); + kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); +} + +static inline void p4d_populate(struct mm_struct *mm, p4d_t *pgd, pud_t *pud) +{ + *pgd = __p4d(__pgtable_ptr_val(pud) | PGD_VAL_BITS); +} + +static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) +{ + pud_t *pud; + + pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX), + pgtable_gfp_flags(mm, GFP_KERNEL)); + /* + * Tell kmemleak to ignore the PUD, that means don't scan it for + * pointers and don't consider it a leak. PUDs are typically only + * referred to by their PGD, but kmemleak is not able to recognise those + * as pointers, leading to false leak reports. + */ + kmemleak_ignore(pud); + + return pud; +} + +static inline void __pud_free(pud_t *pud) +{ + struct page *page = virt_to_page(pud); + + /* + * Early pud pages allocated via memblock allocator + * can't be directly freed to slab. KFENCE pages have + * both reserved and slab flags set so need to be freed + * kmem_cache_free. + */ + if (PageReserved(page) && !PageSlab(page)) + free_reserved_page(page); + else + kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud); +} + +static inline void pud_free(struct mm_struct *mm, pud_t *pud) +{ + return __pud_free(pud); +} + +static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) +{ + *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS); +} + +static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, + unsigned long address) +{ + pgtable_free_tlb(tlb, pud, PUD_INDEX); +} + +static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) +{ + return pmd_fragment_alloc(mm, addr); +} + +static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) +{ + pmd_fragment_free((unsigned long *)pmd); +} + +static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, + unsigned long address) +{ + return pgtable_free_tlb(tlb, pmd, PMD_INDEX); +} + +static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, + pte_t *pte) +{ + *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS); +} + +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, + pgtable_t pte_page) +{ + *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS); +} + +static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, + unsigned long address) +{ + pgtable_free_tlb(tlb, table, PTE_INDEX); +} + +extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT]; +static inline void update_page_count(int psize, long count) +{ + if (IS_ENABLED(CONFIG_PROC_FS)) + atomic_long_add(count, &direct_pages_count[psize]); +} + +#endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */ |