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