* 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>
unsigned int hpage_shift=HPAGE_SHIFT_DEFAULT;
-static pte_t *
+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);
- pmd = pmd_alloc(mm, pgd, taddr);
- if (pmd)
- pte = pte_alloc_map(mm, pmd, 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 *
+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)) {
- pmd = pmd_offset(pgd, taddr);
- if (pmd_present(*pmd))
- pte = pte_offset_map(pmd, taddr);
+ 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;
-
- // mm->rss += (HPAGE_SIZE / PAGE_SIZE);
- vx_rsspages_add(mm, 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.
+ * Don't actually need to do any preparation, but need to make sure
+ * the address is in the right region.
*/
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
+int prepare_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)
+ if (REGION_NUMBER(addr) != RGN_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);
- // dst->rss += (HPAGE_SIZE / PAGE_SIZE);
- vx_rsspages_add(dst, 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 (! mm->used_hugetlb)
- return ERR_PTR(-EINVAL);
- if (REGION_NUMBER(addr) != REGION_HPAGE)
+ if (REGION_NUMBER(addr) != RGN_HPAGE)
return ERR_PTR(-EINVAL);
ptep = huge_pte_offset(mm, addr);
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)
+void hugetlb_free_pgd_range(struct mmu_gather **tlb,
+ unsigned long addr, unsigned long end,
+ unsigned long floor, unsigned long ceiling)
{
- unsigned long first = start & HUGETLB_PGDIR_MASK;
- unsigned long last = end + HUGETLB_PGDIR_SIZE - 1;
- unsigned long start_index, end_index;
- 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 + HUGETLB_PGDIR_SIZE - 1;
- break;
- }
-no_mmaps:
- if (last < first) /* for arches with discontiguous pgd indices */
- return;
/*
- * If the PGD bits are not consecutive in the virtual address, the
- * old method of shifting the VA >> by PGDIR_SHIFT doesn't work.
+ * This is called to free hugetlb page tables.
+ *
+ * The offset of these addresses from the base of the hugetlb
+ * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
+ * the standard free_pgd_range will free the right page tables.
+ *
+ * If floor and ceiling are also in the hugetlb region, they
+ * must likewise be scaled down; but if outside, left unchanged.
*/
- start_index = pgd_index(htlbpage_to_page(first));
- end_index = pgd_index(htlbpage_to_page(last));
-
- if (end_index > start_index) {
- clear_page_tables(tlb, start_index, end_index - start_index);
- }
-}
-
-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));
+ addr = htlbpage_to_page(addr);
+ end = htlbpage_to_page(end);
+ if (REGION_NUMBER(floor) == RGN_HPAGE)
+ floor = htlbpage_to_page(floor);
+ if (REGION_NUMBER(ceiling) == RGN_HPAGE)
+ ceiling = htlbpage_to_page(ceiling);
- 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(pte);
- }
- // mm->rss -= (end - start) >> PAGE_SHIFT;
- vx_rsspages_sub(mm, (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);
- free_huge_page(page);
- goto out;
- }
- }
- set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
- }
-out:
- spin_unlock(&mm->page_table_lock);
- return ret;
+ free_pgd_range(tlb, addr, end, floor, ceiling);
}
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
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)))
+ /* This code assumes that RGN_HPAGE != 0. */
+ if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
addr = HPAGE_REGION_BASE;
else
addr = ALIGN(addr, HPAGE_SIZE);
git://git.onelab.eu / linux-2.6.git / blobdiff