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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/sparc/mm/hugetlbpage.c
Initial import
Diffstat (limited to 'arch/sparc/mm/hugetlbpage.c')
-rw-r--r--arch/sparc/mm/hugetlbpage.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
new file mode 100644
index 000000000..4242eab12
--- /dev/null
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -0,0 +1,226 @@
+/*
+ * SPARC64 Huge TLB page support.
+ *
+ * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/pagemap.h>
+#include <linux/sysctl.h>
+
+#include <asm/mman.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/mmu_context.h>
+
+/* Slightly simplified from the non-hugepage variant because by
+ * definition we don't have to worry about any page coloring stuff
+ */
+
+static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+{
+ unsigned long task_size = TASK_SIZE;
+ struct vm_unmapped_area_info info;
+
+ if (test_thread_flag(TIF_32BIT))
+ task_size = STACK_TOP32;
+
+ info.flags = 0;
+ info.length = len;
+ info.low_limit = TASK_UNMAPPED_BASE;
+ info.high_limit = min(task_size, VA_EXCLUDE_START);
+ info.align_mask = PAGE_MASK & ~HPAGE_MASK;
+ info.align_offset = 0;
+ addr = vm_unmapped_area(&info);
+
+ if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
+ VM_BUG_ON(addr != -ENOMEM);
+ info.low_limit = VA_EXCLUDE_END;
+ info.high_limit = task_size;
+ addr = vm_unmapped_area(&info);
+ }
+
+ return addr;
+}
+
+static unsigned long
+hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+ const unsigned long len,
+ const unsigned long pgoff,
+ const unsigned long flags)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long addr = addr0;
+ struct vm_unmapped_area_info info;
+
+ /* This should only ever run for 32-bit processes. */
+ BUG_ON(!test_thread_flag(TIF_32BIT));
+
+ info.flags = VM_UNMAPPED_AREA_TOPDOWN;
+ info.length = len;
+ info.low_limit = PAGE_SIZE;
+ info.high_limit = mm->mmap_base;
+ info.align_mask = PAGE_MASK & ~HPAGE_MASK;
+ info.align_offset = 0;
+ addr = vm_unmapped_area(&info);
+
+ /*
+ * A failed mmap() very likely causes application failure,
+ * so fall back to the bottom-up function here. This scenario
+ * can happen with large stack limits and large mmap()
+ * allocations.
+ */
+ if (addr & ~PAGE_MASK) {
+ VM_BUG_ON(addr != -ENOMEM);
+ info.flags = 0;
+ info.low_limit = TASK_UNMAPPED_BASE;
+ info.high_limit = STACK_TOP32;
+ addr = vm_unmapped_area(&info);
+ }
+
+ return addr;
+}
+
+unsigned long
+hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ unsigned long task_size = TASK_SIZE;
+
+ if (test_thread_flag(TIF_32BIT))
+ task_size = STACK_TOP32;
+
+ if (len & ~HPAGE_MASK)
+ return -EINVAL;
+ if (len > task_size)
+ return -ENOMEM;
+
+ if (flags & MAP_FIXED) {
+ if (prepare_hugepage_range(file, addr, len))
+ return -EINVAL;
+ return addr;
+ }
+
+ if (addr) {
+ addr = ALIGN(addr, HPAGE_SIZE);
+ vma = find_vma(mm, addr);
+ if (task_size - len >= addr &&
+ (!vma || addr + len <= vma->vm_start))
+ return addr;
+ }
+ if (mm->get_unmapped_area == arch_get_unmapped_area)
+ return hugetlb_get_unmapped_area_bottomup(file, addr, len,
+ pgoff, flags);
+ else
+ return hugetlb_get_unmapped_area_topdown(file, addr, len,
+ pgoff, flags);
+}
+
+pte_t *huge_pte_alloc(struct mm_struct *mm,
+ unsigned long addr, unsigned long sz)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ /* We must align the address, because our caller will run
+ * set_huge_pte_at() on whatever we return, which writes out
+ * all of the sub-ptes for the hugepage range. So we have
+ * to give it the first such sub-pte.
+ */
+ addr &= HPAGE_MASK;
+
+ pgd = pgd_offset(mm, addr);
+ pud = pud_alloc(mm, pgd, addr);
+ if (pud) {
+ pmd = pmd_alloc(mm, pud, addr);
+ if (pmd)
+ pte = pte_alloc_map(mm, NULL, pmd, addr);
+ }
+ return pte;
+}
+
+pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ addr &= HPAGE_MASK;
+
+ pgd = pgd_offset(mm, addr);
+ if (!pgd_none(*pgd)) {
+ pud = pud_offset(pgd, addr);
+ if (!pud_none(*pud)) {
+ pmd = pmd_offset(pud, addr);
+ if (!pmd_none(*pmd))
+ pte = pte_offset_map(pmd, addr);
+ }
+ }
+ return pte;
+}
+
+int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
+{
+ return 0;
+}
+
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t entry)
+{
+ int i;
+
+ if (!pte_present(*ptep) && pte_present(entry))
+ mm->context.huge_pte_count++;
+
+ addr &= HPAGE_MASK;
+ for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+ set_pte_at(mm, addr, ptep, entry);
+ ptep++;
+ addr += PAGE_SIZE;
+ pte_val(entry) += PAGE_SIZE;
+ }
+}
+
+pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep)
+{
+ pte_t entry;
+ int i;
+
+ entry = *ptep;
+ if (pte_present(entry))
+ mm->context.huge_pte_count--;
+
+ addr &= HPAGE_MASK;
+
+ for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+ pte_clear(mm, addr, ptep);
+ addr += PAGE_SIZE;
+ ptep++;
+ }
+
+ return entry;
+}
+
+int pmd_huge(pmd_t pmd)
+{
+ return 0;
+}
+
+int pud_huge(pud_t pud)
+{
+ return 0;
+}