Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/pte-walk.h
#ifndef _ASM_POWERPC_PTE_WALK_H
#define _ASM_POWERPC_PTE_WALK_H
#include <linux/sched.h>
/* Don't use this directly */
extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift);
static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift)
{
pte_t *pte;
VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
#if defined(CONFIG_DEBUG_VM) && \
!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
/*
* We should not find huge page if these configs are not enabled.
*/
if (hshift)
WARN_ON(*hshift);
#endif
return pte;
}
static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift)
{
pgd_t *pgdir = init_mm.pgd;
return __find_linux_pte(pgdir, ea, NULL, hshift);
}
/*
* Convert a kernel vmap virtual address (vmalloc or ioremap space) to a
* physical address, without taking locks. This can be used in real-mode.
*/
static inline phys_addr_t ppc_find_vmap_phys(unsigned long addr)
{
pte_t *ptep;
phys_addr_t pa;
int hugepage_shift;
/*
* init_mm does not free page tables, and does not do THP. It may
* have huge pages from huge vmalloc / ioremap etc.
*/
ptep = find_init_mm_pte(addr, &hugepage_shift);
if (WARN_ON(!ptep))
return 0;
pa = PFN_PHYS(pte_pfn(*ptep));
if (!hugepage_shift)
hugepage_shift = PAGE_SHIFT;
pa |= addr & ((1ul << hugepage_shift) - 1);
return pa;
}
/*
* This is what we should always use. Any other lockless page table lookup needs
* careful audit against THP split.
*/
static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hshift)
{
pte_t *pte;
VM_WARN(!arch_irqs_disabled(), "%s called with irq enabled\n", __func__);
VM_WARN(pgdir != current->mm->pgd,
"%s lock less page table lookup called on wrong mm\n", __func__);
pte = __find_linux_pte(pgdir, ea, is_thp, hshift);
#if defined(CONFIG_DEBUG_VM) && \
!(defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE))
/*
* We should not find huge page if these configs are not enabled.
*/
if (hshift)
WARN_ON(*hshift);
#endif
return pte;
}
#endif /* _ASM_POWERPC_PTE_WALK_H */
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