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-rw-r--r--arch/loongarch/mm/hugetlbpage.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/loongarch/mm/hugetlbpage.c b/arch/loongarch/mm/hugetlbpage.c
new file mode 100644
index 000000000..ba138117b
--- /dev/null
+++ b/arch/loongarch/mm/hugetlbpage.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/pagemap.h>
+#include <linux/err.h>
+#include <linux/sysctl.h>
+#include <asm/mman.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pte_t *pte = NULL;
+
+ pgd = pgd_offset(mm, addr);
+ p4d = p4d_alloc(mm, pgd, addr);
+ pud = pud_alloc(mm, p4d, addr);
+ if (pud)
+ pte = (pte_t *)pmd_alloc(mm, pud, addr);
+
+ return pte;
+}
+
+pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
+ unsigned long sz)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd = NULL;
+
+ pgd = pgd_offset(mm, addr);
+ if (pgd_present(*pgd)) {
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_present(*p4d)) {
+ pud = pud_offset(p4d, addr);
+ if (pud_present(*pud))
+ pmd = pmd_offset(pud, addr);
+ }
+ }
+ return (pte_t *) pmd;
+}
+
+/*
+ * This function checks for proper alignment of input addr and len parameters.
+ */
+int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
+{
+ if (len & ~HPAGE_MASK)
+ return -EINVAL;
+ if (addr & ~HPAGE_MASK)
+ return -EINVAL;
+ return 0;
+}
+
+int pmd_huge(pmd_t pmd)
+{
+ return (pmd_val(pmd) & _PAGE_HUGE) != 0;
+}
+
+int pud_huge(pud_t pud)
+{
+ return (pud_val(pud) & _PAGE_HUGE) != 0;
+}
+
+uint64_t pmd_to_entrylo(unsigned long pmd_val)
+{
+ uint64_t val;
+ /* PMD as PTE. Must be huge page */
+ if (!pmd_huge(__pmd(pmd_val)))
+ panic("%s", __func__);
+
+ val = pmd_val ^ _PAGE_HUGE;
+ val |= ((val & _PAGE_HGLOBAL) >>
+ (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
+
+ return val;
+}