arch/sparc/mm/hugetlbpage.c - kernel/msm-4.9 - Gitiles

 /*
  * 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/pgtable.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 <= vm_start_gap(vma)))
 			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;
 	pte_t *pte = NULL;

 	pgd = pgd_offset(mm, addr);
 	pud = pud_alloc(mm, pgd, 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)
 {
 	pgd_t *pgd;
 	pud_t *pud;
 	pte_t *pte = NULL;

 	pgd = pgd_offset(mm, addr);
 	if (!pgd_none(*pgd)) {
 		pud = pud_offset(pgd, addr);
 		if (!pud_none(*pud))
 			pte = (pte_t *)pmd_offset(pud, addr);
 	}
 	return pte;
 }

 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
 		     pte_t *ptep, pte_t entry)
 {
 	pte_t orig;

 	if (!pte_present(*ptep) && pte_present(entry))
 		mm->context.hugetlb_pte_count++;

 	addr &= HPAGE_MASK;
 	orig = *ptep;
 	*ptep = entry;

 	/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
 	maybe_tlb_batch_add(mm, addr, ptep, orig, 0);
 	maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0);
 }

 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 			      pte_t *ptep)
 {
 	pte_t entry;

 	entry = *ptep;
 	if (pte_present(entry))
 		mm->context.hugetlb_pte_count--;

 	addr &= HPAGE_MASK;
 	*ptep = __pte(0UL);

 	/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
 	maybe_tlb_batch_add(mm, addr, ptep, entry, 0);
 	maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0);

 	return entry;
 }

 int pmd_huge(pmd_t pmd)
 {
 	return !pmd_none(pmd) &&
 		(pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;
 }

 int pud_huge(pud_t pud)
 {
 	return 0;
 }

 static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
 			   unsigned long addr)
 {
 	pgtable_t token = pmd_pgtable(*pmd);

 	pmd_clear(pmd);
 	pte_free_tlb(tlb, token, addr);
 	atomic_long_dec(&tlb->mm->nr_ptes);
 }

 static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
 				   unsigned long addr, unsigned long end,
 				   unsigned long floor, unsigned long ceiling)
 {
 	pmd_t *pmd;
 	unsigned long next;
 	unsigned long start;

 	start = addr;
 	pmd = pmd_offset(pud, addr);
 	do {
 		next = pmd_addr_end(addr, end);
 		if (pmd_none(*pmd))
 			continue;
 		if (is_hugetlb_pmd(*pmd))
 			pmd_clear(pmd);
 		else
 			hugetlb_free_pte_range(tlb, pmd, addr);
 	} while (pmd++, addr = next, addr != end);

 	start &= PUD_MASK;
 	if (start < floor)
 		return;
 	if (ceiling) {
 		ceiling &= PUD_MASK;
 		if (!ceiling)
 			return;
 	}
 	if (end - 1 > ceiling - 1)
 		return;

 	pmd = pmd_offset(pud, start);
 	pud_clear(pud);
 	pmd_free_tlb(tlb, pmd, start);
 	mm_dec_nr_pmds(tlb->mm);
 }

 static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
 				   unsigned long addr, unsigned long end,
 				   unsigned long floor, unsigned long ceiling)
 {
 	pud_t *pud;
 	unsigned long next;
 	unsigned long start;

 	start = addr;
 	pud = pud_offset(pgd, addr);
 	do {
 		next = pud_addr_end(addr, end);
 		if (pud_none_or_clear_bad(pud))
 			continue;
 		hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
 				       ceiling);
 	} while (pud++, addr = next, addr != end);

 	start &= PGDIR_MASK;
 	if (start < floor)
 		return;
 	if (ceiling) {
 		ceiling &= PGDIR_MASK;
 		if (!ceiling)
 			return;
 	}
 	if (end - 1 > ceiling - 1)
 		return;

 	pud = pud_offset(pgd, start);
 	pgd_clear(pgd);
 	pud_free_tlb(tlb, pud, start);
 }

 void hugetlb_free_pgd_range(struct mmu_gather *tlb,
 			    unsigned long addr, unsigned long end,
 			    unsigned long floor, unsigned long ceiling)
 {
 	pgd_t *pgd;
 	unsigned long next;

 	pgd = pgd_offset(tlb->mm, addr);
 	do {
 		next = pgd_addr_end(addr, end);
 		if (pgd_none_or_clear_bad(pgd))
 			continue;
 		hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
 	} while (pgd++, addr = next, addr != end);
 }
	/*
	* 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/pgtable.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 <= vm_start_gap(vma)))
	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;
	pte_t *pte = NULL;

	pgd = pgd_offset(mm, addr);
	pud = pud_alloc(mm, pgd, 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)
	{
	pgd_t *pgd;
	pud_t *pud;
	pte_t *pte = NULL;

	pgd = pgd_offset(mm, addr);
	if (!pgd_none(*pgd)) {
	pud = pud_offset(pgd, addr);
	if (!pud_none(*pud))
	pte = (pte_t *)pmd_offset(pud, addr);
	}
	return pte;
	}

	void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
	pte_t *ptep, pte_t entry)
	{
	pte_t orig;

	if (!pte_present(*ptep) && pte_present(entry))
	mm->context.hugetlb_pte_count++;

	addr &= HPAGE_MASK;
	orig = *ptep;
	*ptep = entry;

	/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
	maybe_tlb_batch_add(mm, addr, ptep, orig, 0);
	maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0);
	}

	pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
	pte_t *ptep)
	{
	pte_t entry;

	entry = *ptep;
	if (pte_present(entry))
	mm->context.hugetlb_pte_count--;

	addr &= HPAGE_MASK;
	*ptep = __pte(0UL);

	/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
	maybe_tlb_batch_add(mm, addr, ptep, entry, 0);
	maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0);

	return entry;
	}

	int pmd_huge(pmd_t pmd)
	{
	return !pmd_none(pmd) &&
	(pmd_val(pmd) & (_PAGE_VALID\|_PAGE_PMD_HUGE)) != _PAGE_VALID;
	}

	int pud_huge(pud_t pud)
	{
	return 0;
	}

	static void hugetlb_free_pte_range(struct mmu_gather tlb, pmd_t pmd,
	unsigned long addr)
	{
	pgtable_t token = pmd_pgtable(*pmd);

	pmd_clear(pmd);
	pte_free_tlb(tlb, token, addr);
	atomic_long_dec(&tlb->mm->nr_ptes);
	}

	static void hugetlb_free_pmd_range(struct mmu_gather tlb, pud_t pud,
	unsigned long addr, unsigned long end,
	unsigned long floor, unsigned long ceiling)
	{
	pmd_t *pmd;
	unsigned long next;
	unsigned long start;

	start = addr;
	pmd = pmd_offset(pud, addr);
	do {
	next = pmd_addr_end(addr, end);
	if (pmd_none(*pmd))
	continue;
	if (is_hugetlb_pmd(*pmd))
	pmd_clear(pmd);
	else
	hugetlb_free_pte_range(tlb, pmd, addr);
	} while (pmd++, addr = next, addr != end);

	start &= PUD_MASK;
	if (start < floor)
	return;
	if (ceiling) {
	ceiling &= PUD_MASK;
	if (!ceiling)
	return;
	}
	if (end - 1 > ceiling - 1)
	return;

	pmd = pmd_offset(pud, start);
	pud_clear(pud);
	pmd_free_tlb(tlb, pmd, start);
	mm_dec_nr_pmds(tlb->mm);
	}

	static void hugetlb_free_pud_range(struct mmu_gather tlb, pgd_t pgd,
	unsigned long addr, unsigned long end,
	unsigned long floor, unsigned long ceiling)
	{
	pud_t *pud;
	unsigned long next;
	unsigned long start;

	start = addr;
	pud = pud_offset(pgd, addr);
	do {
	next = pud_addr_end(addr, end);
	if (pud_none_or_clear_bad(pud))
	continue;
	hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
	ceiling);
	} while (pud++, addr = next, addr != end);

	start &= PGDIR_MASK;
	if (start < floor)
	return;
	if (ceiling) {
	ceiling &= PGDIR_MASK;
	if (!ceiling)
	return;
	}
	if (end - 1 > ceiling - 1)
	return;

	pud = pud_offset(pgd, start);
	pgd_clear(pgd);
	pud_free_tlb(tlb, pud, start);
	}

	void hugetlb_free_pgd_range(struct mmu_gather *tlb,
	unsigned long addr, unsigned long end,
	unsigned long floor, unsigned long ceiling)
	{
	pgd_t *pgd;
	unsigned long next;

	pgd = pgd_offset(tlb->mm, addr);
	do {
	next = pgd_addr_end(addr, end);
	if (pgd_none_or_clear_bad(pgd))
	continue;
	hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
	} while (pgd++, addr = next, addr != end);
	}