89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
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#ifndef _ASM_POWERPC_PTE_WALK_H
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#define _ASM_POWERPC_PTE_WALK_H
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#include <linux/sched.h>
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/* Don't use this directly */
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extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift);
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static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift)
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{
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pte_t *pte;
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VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
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pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
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#if defined(CONFIG_DEBUG_VM) && \
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!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
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/*
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* We should not find huge page if these configs are not enabled.
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*/
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if (hshift)
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WARN_ON(*hshift);
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#endif
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return pte;
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}
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static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
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{
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pgd_t *pgdir = init_mm.pgd;
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return __find_linux_pte(pgdir, ea, NULL, hshift);
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}
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/*
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* Convert a kernel vmap virtual address (vmalloc or ioremap space) to a
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* physical address, without taking locks. This can be used in real-mode.
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*/
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static inline phys_addr_t ppc_find_vmap_phys(unsigned long addr)
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{
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pte_t *ptep;
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phys_addr_t pa;
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int hugepage_shift;
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/*
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* init_mm does not free page tables, and does not do THP. It may
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* have huge pages from huge vmalloc / ioremap etc.
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*/
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ptep = find_init_mm_pte(addr, &hugepage_shift);
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if (WARN_ON(!ptep))
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return 0;
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pa = PFN_PHYS(pte_pfn(*ptep));
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if (!hugepage_shift)
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hugepage_shift = PAGE_SHIFT;
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pa |= addr & ((1ul << hugepage_shift) - 1);
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return pa;
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}
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/*
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* This is what we should always use. Any other lockless page table lookup needs
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* careful audit against THP split.
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*/
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static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
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bool *is_thp, unsigned *hshift)
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{
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pte_t *pte;
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VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
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VM_WARN(pgdir != current->mm->pgd,
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"%s lock less page table lookup called on wrong mm\n", __func__);
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pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
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#if defined(CONFIG_DEBUG_VM) && \
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!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
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/*
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* We should not find huge page if these configs are not enabled.
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*/
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if (hshift)
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WARN_ON(*hshift);
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#endif
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return pte;
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}
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#endif /* _ASM_POWERPC_PTE_WALK_H */
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