v4.19.13 snapshot.
diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h
new file mode 100644
index 0000000..2d00cc5
--- /dev/null
+++ b/arch/powerpc/include/asm/hugetlb.h
@@ -0,0 +1,193 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_HUGETLB_H
+#define _ASM_POWERPC_HUGETLB_H
+
+#ifdef CONFIG_HUGETLB_PAGE
+#include <asm/page.h>
+#include <asm-generic/hugetlb.h>
+
+extern struct kmem_cache *hugepte_cache;
+
+#ifdef CONFIG_PPC_BOOK3S_64
+
+#include <asm/book3s/64/hugetlb.h>
+/*
+ * 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);
+}
+
+#else
+
+static inline pte_t *hugepd_page(hugepd_t hpd)
+{
+ BUG_ON(!hugepd_ok(hpd));
+#ifdef CONFIG_PPC_8xx
+ return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
+#else
+ return (pte_t *)((hpd_val(hpd) &
+ ~HUGEPD_SHIFT_MASK) | PD_HUGE);
+#endif
+}
+
+static inline unsigned int hugepd_shift(hugepd_t hpd)
+{
+#ifdef CONFIG_PPC_8xx
+ return ((hpd_val(hpd) & _PMD_PAGE_MASK) >> 1) + 17;
+#else
+ return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
+#endif
+}
+
+#endif /* CONFIG_PPC_BOOK3S_64 */
+
+
+static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
+ unsigned pdshift)
+{
+ /*
+ * On FSL BookE, we have multiple higher-level table entries that
+ * point to the same hugepte. Just use the first one since they're all
+ * identical. So for that case, idx=0.
+ */
+ unsigned long idx = 0;
+
+ pte_t *dir = hugepd_page(hpd);
+#ifndef CONFIG_PPC_FSL_BOOK3E
+ idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
+#endif
+
+ return dir + idx;
+}
+
+void flush_dcache_icache_hugepage(struct page *page);
+
+int slice_is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
+ unsigned long len);
+
+static inline int is_hugepage_only_range(struct mm_struct *mm,
+ unsigned long addr,
+ unsigned long len)
+{
+ if (IS_ENABLED(CONFIG_PPC_MM_SLICES) && !radix_enabled())
+ return slice_is_hugepage_only_range(mm, addr, len);
+ return 0;
+}
+
+void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
+ pte_t pte);
+#ifdef CONFIG_PPC_8xx
+static inline void flush_hugetlb_page(struct vm_area_struct *vma,
+ unsigned long vmaddr)
+{
+ flush_tlb_page(vma, vmaddr);
+}
+#else
+void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+#endif
+
+void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
+ unsigned long end, unsigned long floor,
+ unsigned long ceiling);
+
+/*
+ * If the arch doesn't supply something else, assume that hugepage
+ * size aligned regions are ok without further preparation.
+ */
+static inline int prepare_hugepage_range(struct file *file,
+ unsigned long addr, unsigned long len)
+{
+ struct hstate *h = hstate_file(file);
+ if (len & ~huge_page_mask(h))
+ return -EINVAL;
+ if (addr & ~huge_page_mask(h))
+ return -EINVAL;
+ return 0;
+}
+
+static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
+{
+ set_pte_at(mm, addr, ptep, pte);
+}
+
+static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+#ifdef CONFIG_PPC64
+ return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1));
+#else
+ return __pte(pte_update(ptep, ~0UL, 0));
+#endif
+}
+
+static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
+{
+ pte_t pte;
+ pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
+ flush_hugetlb_page(vma, addr);
+}
+
+static inline int huge_pte_none(pte_t pte)
+{
+ return pte_none(pte);
+}
+
+static inline pte_t huge_pte_wrprotect(pte_t pte)
+{
+ return pte_wrprotect(pte);
+}
+
+extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep,
+ pte_t pte, int dirty);
+
+static inline pte_t huge_ptep_get(pte_t *ptep)
+{
+ return *ptep;
+}
+
+static inline void arch_clear_hugepage_flags(struct page *page)
+{
+}
+
+#else /* ! CONFIG_HUGETLB_PAGE */
+static inline void flush_hugetlb_page(struct vm_area_struct *vma,
+ unsigned long vmaddr)
+{
+}
+
+#define hugepd_shift(x) 0
+static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
+ unsigned pdshift)
+{
+ return NULL;
+}
+#endif /* CONFIG_HUGETLB_PAGE */
+
+#endif /* _ASM_POWERPC_HUGETLB_H */