arch/powerpc/include/asm/book3s/64/hugetlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_BOOK3S_64_HUGETLB_H
   3 #define _ASM_POWERPC_BOOK3S_64_HUGETLB_H
   4 /*
   5  * For radix we want generic code to handle hugetlb. But then if we want
   6  * both hash and radix to be enabled together we need to workaround the
   7  * limitations.
   8  */
   9 void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
  10 void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
  11 extern unsigned long
  12 radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
  13                                 unsigned long len, unsigned long pgoff,
  14                                 unsigned long flags);
  15
  16 extern void radix__huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
  17                                                 unsigned long addr, pte_t *ptep,
  18                                                 pte_t old_pte, pte_t pte);
  19
  20 static inline int hstate_get_psize(struct hstate *hstate)
  21 {
  22         unsigned long shift;
  23
  24         shift = huge_page_shift(hstate);
  25         if (shift == mmu_psize_defs[MMU_PAGE_2M].shift)
  26                 return MMU_PAGE_2M;
  27         else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift)
  28                 return MMU_PAGE_1G;
  29         else if (shift == mmu_psize_defs[MMU_PAGE_16M].shift)
  30                 return MMU_PAGE_16M;
  31         else if (shift == mmu_psize_defs[MMU_PAGE_16G].shift)
  32                 return MMU_PAGE_16G;
  33         else {
  34                 WARN(1, "Wrong huge page shift\n");
  35                 return mmu_virtual_psize;
  36         }
  37 }
  38
  39 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
  40 static inline bool gigantic_page_supported(void)
  41 {
  42         /*
  43          * We used gigantic page reservation with hypervisor assist in some case.
  44          * We cannot use runtime allocation of gigantic pages in those platforms
  45          * This is hash translation mode LPARs.
  46          */
  47         if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
  48                 return false;
  49
  50         return true;
  51 }
  52 #endif
  53
  54 /* hugepd entry valid bit */
  55 #define HUGEPD_VAL_BITS         (0x8000000000000000UL)
  56
  57 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
  58 extern pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
  59                                          unsigned long addr, pte_t *ptep);
  60
  61 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
  62 extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
  63                                          unsigned long addr, pte_t *ptep,
  64                                          pte_t old_pte, pte_t new_pte);
  65 #endif