[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/arm64/mm/hugetlbpage.c b/src/kernel/linux/v4.14/arch/arm64/mm/hugetlbpage.c
new file mode 100644
index 0000000..9f6ae96
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/arm64/mm/hugetlbpage.c
@@ -0,0 +1,438 @@
+/*
+ * arch/arm64/mm/hugetlbpage.c
+ *
+ * Copyright (C) 2013 Linaro Ltd.
+ *
+ * Based on arch/x86/mm/hugetlbpage.c.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/init.h>
+#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>
+#include <asm/pgalloc.h>
+
+int pmd_huge(pmd_t pmd)
+{
+ return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
+}
+
+int pud_huge(pud_t pud)
+{
+#ifndef __PAGETABLE_PMD_FOLDED
+ return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
+#else
+ return 0;
+#endif
+}
+
+/*
+ * Select all bits except the pfn
+ */
+static inline pgprot_t pte_pgprot(pte_t pte)
+{
+ unsigned long pfn = pte_pfn(pte);
+
+ return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
+}
+
+static int find_num_contig(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, size_t *pgsize)
+{
+ pgd_t *pgd = pgd_offset(mm, addr);
+ pud_t *pud;
+ pmd_t *pmd;
+
+ *pgsize = PAGE_SIZE;
+ pud = pud_offset(pgd, addr);
+ pmd = pmd_offset(pud, addr);
+ if ((pte_t *)pmd == ptep) {
+ *pgsize = PMD_SIZE;
+ return CONT_PMDS;
+ }
+ return CONT_PTES;
+}
+
+static inline int num_contig_ptes(unsigned long size, size_t *pgsize)
+{
+ int contig_ptes = 0;
+
+ *pgsize = size;
+
+ switch (size) {
+#ifdef CONFIG_ARM64_4K_PAGES
+ case PUD_SIZE:
+#endif
+ case PMD_SIZE:
+ contig_ptes = 1;
+ break;
+ case CONT_PMD_SIZE:
+ *pgsize = PMD_SIZE;
+ contig_ptes = CONT_PMDS;
+ break;
+ case CONT_PTE_SIZE:
+ *pgsize = PAGE_SIZE;
+ contig_ptes = CONT_PTES;
+ break;
+ }
+
+ return contig_ptes;
+}
+
+/*
+ * Changing some bits of contiguous entries requires us to follow a
+ * Break-Before-Make approach, breaking the whole contiguous set
+ * before we can change any entries. See ARM DDI 0487A.k_iss10775,
+ * "Misprogramming of the Contiguous bit", page D4-1762.
+ *
+ * This helper performs the break step.
+ */
+static pte_t get_clear_flush(struct mm_struct *mm,
+ unsigned long addr,
+ pte_t *ptep,
+ unsigned long pgsize,
+ unsigned long ncontig)
+{
+ struct vm_area_struct vma = { .vm_mm = mm };
+ pte_t orig_pte = huge_ptep_get(ptep);
+ bool valid = pte_valid(orig_pte);
+ unsigned long i, saddr = addr;
+
+ for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) {
+ pte_t pte = ptep_get_and_clear(mm, addr, ptep);
+
+ /*
+ * If HW_AFDBM is enabled, then the HW could turn on
+ * the dirty or accessed bit for any page in the set,
+ * so check them all.
+ */
+ if (pte_dirty(pte))
+ orig_pte = pte_mkdirty(orig_pte);
+
+ if (pte_young(pte))
+ orig_pte = pte_mkyoung(orig_pte);
+ }
+
+ if (valid)
+ flush_tlb_range(&vma, saddr, addr);
+ return orig_pte;
+}
+
+/*
+ * Changing some bits of contiguous entries requires us to follow a
+ * Break-Before-Make approach, breaking the whole contiguous set
+ * before we can change any entries. See ARM DDI 0487A.k_iss10775,
+ * "Misprogramming of the Contiguous bit", page D4-1762.
+ *
+ * This helper performs the break step for use cases where the
+ * original pte is not needed.
+ */
+static void clear_flush(struct mm_struct *mm,
+ unsigned long addr,
+ pte_t *ptep,
+ unsigned long pgsize,
+ unsigned long ncontig)
+{
+ struct vm_area_struct vma = { .vm_mm = mm };
+ unsigned long i, saddr = addr;
+
+ for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
+ pte_clear(mm, addr, ptep);
+
+ flush_tlb_range(&vma, saddr, addr);
+}
+
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
+{
+ size_t pgsize;
+ int i;
+ int ncontig;
+ unsigned long pfn, dpfn;
+ pgprot_t hugeprot;
+
+ /*
+ * Code needs to be expanded to handle huge swap and migration
+ * entries. Needed for HUGETLB and MEMORY_FAILURE.
+ */
+ WARN_ON(!pte_present(pte));
+
+ if (!pte_cont(pte)) {
+ set_pte_at(mm, addr, ptep, pte);
+ return;
+ }
+
+ ncontig = find_num_contig(mm, addr, ptep, &pgsize);
+ pfn = pte_pfn(pte);
+ dpfn = pgsize >> PAGE_SHIFT;
+ hugeprot = pte_pgprot(pte);
+
+ clear_flush(mm, addr, ptep, pgsize, ncontig);
+
+ for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn) {
+ pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep,
+ pte_val(pfn_pte(pfn, hugeprot)));
+ set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
+ }
+}
+
+void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte, unsigned long sz)
+{
+ int i, ncontig;
+ size_t pgsize;
+
+ ncontig = num_contig_ptes(sz, &pgsize);
+
+ for (i = 0; i < ncontig; i++, ptep++)
+ set_pte(ptep, pte);
+}
+
+pte_t *huge_pte_alloc(struct mm_struct *mm,
+ unsigned long addr, unsigned long sz)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pte_t *pte = NULL;
+
+ pr_debug("%s: addr:0x%lx sz:0x%lx\n", __func__, addr, sz);
+ pgd = pgd_offset(mm, addr);
+ pud = pud_alloc(mm, pgd, addr);
+ if (!pud)
+ return NULL;
+
+ if (sz == PUD_SIZE) {
+ pte = (pte_t *)pud;
+ } else if (sz == (PAGE_SIZE * CONT_PTES)) {
+ pmd_t *pmd = pmd_alloc(mm, pud, addr);
+
+ WARN_ON(addr & (sz - 1));
+ /*
+ * Note that if this code were ever ported to the
+ * 32-bit arm platform then it will cause trouble in
+ * the case where CONFIG_HIGHPTE is set, since there
+ * will be no pte_unmap() to correspond with this
+ * pte_alloc_map().
+ */
+ pte = pte_alloc_map(mm, pmd, addr);
+ } else if (sz == PMD_SIZE) {
+ if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
+ pud_none(*pud))
+ pte = huge_pmd_share(mm, addr, pud);
+ else
+ pte = (pte_t *)pmd_alloc(mm, pud, addr);
+ } else if (sz == (PMD_SIZE * CONT_PMDS)) {
+ pmd_t *pmd;
+
+ pmd = pmd_alloc(mm, pud, addr);
+ WARN_ON(addr & (sz - 1));
+ return (pte_t *)pmd;
+ }
+
+ pr_debug("%s: addr:0x%lx sz:0x%lx ret pte=%p/0x%llx\n", __func__, addr,
+ sz, pte, pte_val(*pte));
+ return pte;
+}
+
+pte_t *huge_pte_offset(struct mm_struct *mm,
+ unsigned long addr, unsigned long sz)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset(mm, addr);
+ pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
+ if (!pgd_present(*pgd))
+ return NULL;
+
+ pud = pud_offset(pgd, addr);
+ if (sz != PUD_SIZE && pud_none(*pud))
+ return NULL;
+ /* hugepage or swap? */
+ if (pud_huge(*pud) || !pud_present(*pud))
+ return (pte_t *)pud;
+ /* table; check the next level */
+
+ if (sz == CONT_PMD_SIZE)
+ addr &= CONT_PMD_MASK;
+
+ pmd = pmd_offset(pud, addr);
+ if (!(sz == PMD_SIZE || sz == CONT_PMD_SIZE) &&
+ pmd_none(*pmd))
+ return NULL;
+ if (pmd_huge(*pmd) || !pmd_present(*pmd))
+ return (pte_t *)pmd;
+
+ if (sz == CONT_PTE_SIZE) {
+ pte_t *pte = pte_offset_kernel(pmd, (addr & CONT_PTE_MASK));
+ return pte;
+ }
+
+ return NULL;
+}
+
+pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
+ struct page *page, int writable)
+{
+ size_t pagesize = huge_page_size(hstate_vma(vma));
+
+ if (pagesize == CONT_PTE_SIZE) {
+ entry = pte_mkcont(entry);
+ } else if (pagesize == CONT_PMD_SIZE) {
+ entry = pmd_pte(pmd_mkcont(pte_pmd(entry)));
+ } else if (pagesize != PUD_SIZE && pagesize != PMD_SIZE) {
+ pr_warn("%s: unrecognized huge page size 0x%lx\n",
+ __func__, pagesize);
+ }
+ return entry;
+}
+
+void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, unsigned long sz)
+{
+ int i, ncontig;
+ size_t pgsize;
+
+ ncontig = num_contig_ptes(sz, &pgsize);
+
+ for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
+ pte_clear(mm, addr, ptep);
+}
+
+pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ int ncontig;
+ size_t pgsize;
+ pte_t orig_pte = huge_ptep_get(ptep);
+
+ if (!pte_cont(orig_pte))
+ return ptep_get_and_clear(mm, addr, ptep);
+
+ ncontig = find_num_contig(mm, addr, ptep, &pgsize);
+
+ return get_clear_flush(mm, addr, ptep, pgsize, ncontig);
+}
+
+int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep,
+ pte_t pte, int dirty)
+{
+ int ncontig, i, changed = 0;
+ size_t pgsize = 0;
+ unsigned long pfn = pte_pfn(pte), dpfn;
+ pgprot_t hugeprot;
+ pte_t orig_pte;
+
+ if (!pte_cont(pte))
+ return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
+
+ ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
+ dpfn = pgsize >> PAGE_SHIFT;
+
+ orig_pte = get_clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
+ if (!pte_same(orig_pte, pte))
+ changed = 1;
+
+ /* Make sure we don't lose the dirty or young state */
+ if (pte_dirty(orig_pte))
+ pte = pte_mkdirty(pte);
+
+ if (pte_young(orig_pte))
+ pte = pte_mkyoung(pte);
+
+ hugeprot = pte_pgprot(pte);
+ for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
+ set_pte_at(vma->vm_mm, addr, ptep, pfn_pte(pfn, hugeprot));
+
+ return changed;
+}
+
+void huge_ptep_set_wrprotect(struct mm_struct *mm,
+ unsigned long addr, pte_t *ptep)
+{
+ unsigned long pfn, dpfn;
+ pgprot_t hugeprot;
+ int ncontig, i;
+ size_t pgsize;
+ pte_t pte;
+
+ if (!pte_cont(*ptep)) {
+ ptep_set_wrprotect(mm, addr, ptep);
+ return;
+ }
+
+ ncontig = find_num_contig(mm, addr, ptep, &pgsize);
+ dpfn = pgsize >> PAGE_SHIFT;
+
+ pte = get_clear_flush(mm, addr, ptep, pgsize, ncontig);
+ pte = pte_wrprotect(pte);
+
+ hugeprot = pte_pgprot(pte);
+ pfn = pte_pfn(pte);
+
+ for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
+ set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
+}
+
+void huge_ptep_clear_flush(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep)
+{
+ size_t pgsize;
+ int ncontig;
+
+ if (!pte_cont(*ptep)) {
+ ptep_clear_flush(vma, addr, ptep);
+ return;
+ }
+
+ ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
+ clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
+}
+
+static __init int setup_hugepagesz(char *opt)
+{
+ unsigned long ps = memparse(opt, &opt);
+
+ switch (ps) {
+#ifdef CONFIG_ARM64_4K_PAGES
+ case PUD_SIZE:
+#endif
+ case PMD_SIZE * CONT_PMDS:
+ case PMD_SIZE:
+ case PAGE_SIZE * CONT_PTES:
+ hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
+ return 1;
+ }
+
+ hugetlb_bad_size();
+ pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
+ return 0;
+}
+__setup("hugepagesz=", setup_hugepagesz);
+
+#ifdef CONFIG_ARM64_64K_PAGES
+static __init int add_default_hugepagesz(void)
+{
+ if (size_to_hstate(CONT_PTES * PAGE_SIZE) == NULL)
+ hugetlb_add_hstate(CONT_PTE_SHIFT);
+ return 0;
+}
+arch_initcall(add_default_hugepagesz);
+#endif