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-rw-r--r--arch/ia64/mm/hugetlbpage.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
new file mode 100644
index 000000000000..40ad8328ffd5
--- /dev/null
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -0,0 +1,357 @@
+/*
+ * IA-64 Huge TLB Page Support for Kernel.
+ *
+ * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com>
+ * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com>
+ *
+ * Sep, 2003: add numa support
+ * Feb, 2004: dynamic hugetlb page size via boot parameter
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <asm/mman.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+unsigned int hpage_shift=HPAGE_SHIFT_DEFAULT;
+
+static pte_t *
+huge_pte_alloc (struct mm_struct *mm, unsigned long addr)
+{
+ unsigned long taddr = htlbpage_to_page(addr);
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ pgd = pgd_offset(mm, taddr);
+ pud = pud_alloc(mm, pgd, taddr);
+ if (pud) {
+ pmd = pmd_alloc(mm, pud, taddr);
+ if (pmd)
+ pte = pte_alloc_map(mm, pmd, taddr);
+ }
+ return pte;
+}
+
+static pte_t *
+huge_pte_offset (struct mm_struct *mm, unsigned long addr)
+{
+ unsigned long taddr = htlbpage_to_page(addr);
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ pgd = pgd_offset(mm, taddr);
+ if (pgd_present(*pgd)) {
+ pud = pud_offset(pgd, taddr);
+ if (pud_present(*pud)) {
+ pmd = pmd_offset(pud, taddr);
+ if (pmd_present(*pmd))
+ pte = pte_offset_map(pmd, taddr);
+ }
+ }
+
+ return pte;
+}
+
+#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
+
+static void
+set_huge_pte (struct mm_struct *mm, struct vm_area_struct *vma,
+ struct page *page, pte_t * page_table, int write_access)
+{
+ pte_t entry;
+
+ add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE);
+ if (write_access) {
+ entry =
+ pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot)));
+ } else
+ entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
+ entry = pte_mkyoung(entry);
+ mk_pte_huge(entry);
+ set_pte(page_table, entry);
+ return;
+}
+/*
+ * 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;
+ if (REGION_NUMBER(addr) != REGION_HPAGE)
+ return -EINVAL;
+
+ return 0;
+}
+
+int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
+ struct vm_area_struct *vma)
+{
+ pte_t *src_pte, *dst_pte, entry;
+ struct page *ptepage;
+ unsigned long addr = vma->vm_start;
+ unsigned long end = vma->vm_end;
+
+ while (addr < end) {
+ dst_pte = huge_pte_alloc(dst, addr);
+ if (!dst_pte)
+ goto nomem;
+ src_pte = huge_pte_offset(src, addr);
+ entry = *src_pte;
+ ptepage = pte_page(entry);
+ get_page(ptepage);
+ set_pte(dst_pte, entry);
+ add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
+ addr += HPAGE_SIZE;
+ }
+ return 0;
+nomem:
+ return -ENOMEM;
+}
+
+int
+follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ struct page **pages, struct vm_area_struct **vmas,
+ unsigned long *st, int *length, int i)
+{
+ pte_t *ptep, pte;
+ unsigned long start = *st;
+ unsigned long pstart;
+ int len = *length;
+ struct page *page;
+
+ do {
+ pstart = start & HPAGE_MASK;
+ ptep = huge_pte_offset(mm, start);
+ pte = *ptep;
+
+back1:
+ page = pte_page(pte);
+ if (pages) {
+ page += ((start & ~HPAGE_MASK) >> PAGE_SHIFT);
+ get_page(page);
+ pages[i] = page;
+ }
+ if (vmas)
+ vmas[i] = vma;
+ i++;
+ len--;
+ start += PAGE_SIZE;
+ if (((start & HPAGE_MASK) == pstart) && len &&
+ (start < vma->vm_end))
+ goto back1;
+ } while (len && start < vma->vm_end);
+ *length = len;
+ *st = start;
+ return i;
+}
+
+struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write)
+{
+ struct page *page;
+ pte_t *ptep;
+
+ if (REGION_NUMBER(addr) != REGION_HPAGE)
+ return ERR_PTR(-EINVAL);
+
+ ptep = huge_pte_offset(mm, addr);
+ if (!ptep || pte_none(*ptep))
+ return NULL;
+ page = pte_page(*ptep);
+ page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT);
+ return page;
+}
+int pmd_huge(pmd_t pmd)
+{
+ return 0;
+}
+struct page *
+follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
+{
+ return NULL;
+}
+
+/*
+ * Same as generic free_pgtables(), except constant PGDIR_* and pgd_offset
+ * are hugetlb region specific.
+ */
+void hugetlb_free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *prev,
+ unsigned long start, unsigned long end)
+{
+ unsigned long first = start & HUGETLB_PGDIR_MASK;
+ unsigned long last = end + HUGETLB_PGDIR_SIZE - 1;
+ struct mm_struct *mm = tlb->mm;
+
+ if (!prev) {
+ prev = mm->mmap;
+ if (!prev)
+ goto no_mmaps;
+ if (prev->vm_end > start) {
+ if (last > prev->vm_start)
+ last = prev->vm_start;
+ goto no_mmaps;
+ }
+ }
+ for (;;) {
+ struct vm_area_struct *next = prev->vm_next;
+
+ if (next) {
+ if (next->vm_start < start) {
+ prev = next;
+ continue;
+ }
+ if (last > next->vm_start)
+ last = next->vm_start;
+ }
+ if (prev->vm_end > first)
+ first = prev->vm_end;
+ break;
+ }
+no_mmaps:
+ if (last < first) /* for arches with discontiguous pgd indices */
+ return;
+ clear_page_range(tlb, first, last);
+}
+
+void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ unsigned long address;
+ pte_t *pte;
+ struct page *page;
+
+ BUG_ON(start & (HPAGE_SIZE - 1));
+ BUG_ON(end & (HPAGE_SIZE - 1));
+
+ for (address = start; address < end; address += HPAGE_SIZE) {
+ pte = huge_pte_offset(mm, address);
+ if (pte_none(*pte))
+ continue;
+ page = pte_page(*pte);
+ put_page(page);
+ pte_clear(mm, address, pte);
+ }
+ add_mm_counter(mm, rss, - ((end - start) >> PAGE_SHIFT));
+ flush_tlb_range(vma, start, end);
+}
+
+int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long addr;
+ int ret = 0;
+
+ BUG_ON(vma->vm_start & ~HPAGE_MASK);
+ BUG_ON(vma->vm_end & ~HPAGE_MASK);
+
+ spin_lock(&mm->page_table_lock);
+ for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
+ unsigned long idx;
+ pte_t *pte = huge_pte_alloc(mm, addr);
+ struct page *page;
+
+ if (!pte) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (!pte_none(*pte))
+ continue;
+
+ idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
+ + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
+ page = find_get_page(mapping, idx);
+ if (!page) {
+ /* charge the fs quota first */
+ if (hugetlb_get_quota(mapping)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ page = alloc_huge_page();
+ if (!page) {
+ hugetlb_put_quota(mapping);
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
+ if (! ret) {
+ unlock_page(page);
+ } else {
+ hugetlb_put_quota(mapping);
+ page_cache_release(page);
+ goto out;
+ }
+ }
+ set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
+ }
+out:
+ spin_unlock(&mm->page_table_lock);
+ return ret;
+}
+
+unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags)
+{
+ struct vm_area_struct *vmm;
+
+ if (len > RGN_MAP_LIMIT)
+ return -ENOMEM;
+ if (len & ~HPAGE_MASK)
+ return -EINVAL;
+ /* This code assumes that REGION_HPAGE != 0. */
+ if ((REGION_NUMBER(addr) != REGION_HPAGE) || (addr & (HPAGE_SIZE - 1)))
+ addr = HPAGE_REGION_BASE;
+ else
+ addr = ALIGN(addr, HPAGE_SIZE);
+ for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
+ /* At this point: (!vmm || addr < vmm->vm_end). */
+ if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
+ return -ENOMEM;
+ if (!vmm || (addr + len) <= vmm->vm_start)
+ return addr;
+ addr = ALIGN(vmm->vm_end, HPAGE_SIZE);
+ }
+}
+
+static int __init hugetlb_setup_sz(char *str)
+{
+ u64 tr_pages;
+ unsigned long long size;
+
+ if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0)
+ /*
+ * shouldn't happen, but just in case.
+ */
+ tr_pages = 0x15557000UL;
+
+ size = memparse(str, &str);
+ if (*str || (size & (size-1)) || !(tr_pages & size) ||
+ size <= PAGE_SIZE ||
+ size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
+ printk(KERN_WARNING "Invalid huge page size specified\n");
+ return 1;
+ }
+
+ hpage_shift = __ffs(size);
+ /*
+ * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT
+ * override here with new page shift.
+ */
+ ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2);
+ return 1;
+}
+__setup("hugepagesz=", hugetlb_setup_sz);