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powerpc/mm: split asm/hugetlb.h into dedicated subarch files

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Three subarches support hugepages:
  - fsl book3e
  - book3s/64
  - 8xx

This patch splits asm/hugetlb.h to reduce the #ifdef mess.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-04-26 05:59:44 +00:00
committed by Michael Ellerman
parent 0001e5aa5c
commit 8197af22be
4 changed files with 106 additions and 83 deletions
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40
arch/powerpc/include/asm/book3s/64/hugetlb.h
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@@ -62,4 +62,44 @@ extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t old_pte, pte_t new_pte);
/*
* This should work for other subarchs too. But right now we use the
* new format only for 64bit book3s
*/
static inline pte_t *hugepd_page(hugepd_t hpd)
{
BUG_ON(!hugepd_ok(hpd));
/*
* We have only four bits to encode, MMU page size
*/
BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
}
static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
{
return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
}
static inline unsigned int hugepd_shift(hugepd_t hpd)
{
return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
}
static inline void flush_hugetlb_page(struct vm_area_struct *vma,
unsigned long vmaddr)
{
if (radix_enabled())
return radix__flush_hugetlb_page(vma, vmaddr);
}
static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
unsigned int pdshift)
{
unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
return hugepd_page(hpd) + idx;
}
void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
#endif