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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/metag/mm/hugetlbpage.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/metag/mm/hugetlbpage.c')
-rw-r--r-- | kernel/arch/metag/mm/hugetlbpage.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/kernel/arch/metag/mm/hugetlbpage.c b/kernel/arch/metag/mm/hugetlbpage.c new file mode 100644 index 000000000..7ca80ac42 --- /dev/null +++ b/kernel/arch/metag/mm/hugetlbpage.c @@ -0,0 +1,253 @@ +/* + * arch/metag/mm/hugetlbpage.c + * + * METAG HugeTLB page support. + * + * Cloned from SuperH + * + * Cloned from sparc64 by Paul Mundt. + * + * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) + */ + +#include <linux/init.h> +#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> + +/* + * If the arch doesn't supply something else, assume that hugepage + * size aligned regions are ok without further preparation. + */ +int prepare_hugepage_range(struct file *file, unsigned long addr, + unsigned long len) +{ + struct mm_struct *mm = current->mm; + struct hstate *h = hstate_file(file); + struct vm_area_struct *vma; + + if (len & ~huge_page_mask(h)) + return -EINVAL; + if (addr & ~huge_page_mask(h)) + return -EINVAL; + if (TASK_SIZE - len < addr) + return -EINVAL; + + vma = find_vma(mm, ALIGN_HUGEPT(addr)); + if (vma && !(vma->vm_flags & MAP_HUGETLB)) + return -EINVAL; + + vma = find_vma(mm, addr); + if (vma) { + if (addr + len > vma->vm_start) + return -EINVAL; + if (!(vma->vm_flags & MAP_HUGETLB) && + (ALIGN_HUGEPT(addr + len) > vma->vm_start)) + return -EINVAL; + } + return 0; +} + +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; + + pgd = pgd_offset(mm, addr); + pud = pud_offset(pgd, addr); + pmd = pmd_offset(pud, addr); + pte = pte_alloc_map(mm, NULL, pmd, addr); + pgd->pgd &= ~_PAGE_SZ_MASK; + pgd->pgd |= _PAGE_SZHUGE; + + 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; + + pgd = pgd_offset(mm, addr); + pud = pud_offset(pgd, addr); + pmd = pmd_offset(pud, addr); + pte = pte_offset_kernel(pmd, addr); + + return pte; +} + +int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) +{ + return 0; +} + +int pmd_huge(pmd_t pmd) +{ + return pmd_page_shift(pmd) > PAGE_SHIFT; +} + +int pud_huge(pud_t pud) +{ + return 0; +} + +struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, + pmd_t *pmd, int write) +{ + return NULL; +} + +#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA + +/* + * Look for an unmapped area starting after another hugetlb vma. + * There are guaranteed to be no huge pte's spare if all the huge pages are + * full size (4MB), so in that case compile out this search. + */ +#if HPAGE_SHIFT == HUGEPT_SHIFT +static inline unsigned long +hugetlb_get_unmapped_area_existing(unsigned long len) +{ + return 0; +} +#else +static unsigned long +hugetlb_get_unmapped_area_existing(unsigned long len) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + unsigned long start_addr, addr; + int after_huge; + + if (mm->context.part_huge) { + start_addr = mm->context.part_huge; + after_huge = 1; + } else { + start_addr = TASK_UNMAPPED_BASE; + after_huge = 0; + } +new_search: + addr = start_addr; + + for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { + if ((!vma && !after_huge) || TASK_SIZE - len < addr) { + /* + * Start a new search - just in case we missed + * some holes. + */ + if (start_addr != TASK_UNMAPPED_BASE) { + start_addr = TASK_UNMAPPED_BASE; + goto new_search; + } + return 0; + } + /* skip ahead if we've aligned right over some vmas */ + if (vma && vma->vm_end <= addr) + continue; + /* space before the next vma? */ + if (after_huge && (!vma || ALIGN_HUGEPT(addr + len) + <= vma->vm_start)) { + unsigned long end = addr + len; + if (end & HUGEPT_MASK) + mm->context.part_huge = end; + else if (addr == mm->context.part_huge) + mm->context.part_huge = 0; + return addr; + } + if (vma->vm_flags & MAP_HUGETLB) { + /* space after a huge vma in 2nd level page table? */ + if (vma->vm_end & HUGEPT_MASK) { + after_huge = 1; + /* no need to align to the next PT block */ + addr = vma->vm_end; + continue; + } + } + after_huge = 0; + addr = ALIGN_HUGEPT(vma->vm_end); + } +} +#endif + +/* Do a full search to find an area without any nearby normal pages. */ +static unsigned long +hugetlb_get_unmapped_area_new_pmd(unsigned long len) +{ + struct vm_unmapped_area_info info; + + info.flags = 0; + info.length = len; + info.low_limit = TASK_UNMAPPED_BASE; + info.high_limit = TASK_SIZE; + info.align_mask = PAGE_MASK & HUGEPT_MASK; + info.align_offset = 0; + return vm_unmapped_area(&info); +} + +unsigned long +hugetlb_get_unmapped_area(struct file *file, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct hstate *h = hstate_file(file); + + if (len & ~huge_page_mask(h)) + 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, huge_page_size(h)); + if (!prepare_hugepage_range(file, addr, len)) + return addr; + } + + /* + * Look for an existing hugetlb vma with space after it (this is to to + * minimise fragmentation caused by huge pages. + */ + addr = hugetlb_get_unmapped_area_existing(len); + if (addr) + return addr; + + /* + * Find an unmapped naturally aligned set of 4MB blocks that we can use + * for huge pages. + */ + return hugetlb_get_unmapped_area_new_pmd(len); +} + +#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/ + +/* necessary for boot time 4MB huge page allocation */ +static __init int setup_hugepagesz(char *opt) +{ + unsigned long ps = memparse(opt, &opt); + if (ps == (1 << HPAGE_SHIFT)) { + hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); + } else { + pr_err("hugepagesz: Unsupported page size %lu M\n", + ps >> 20); + return 0; + } + return 1; +} +__setup("hugepagesz=", setup_hugepagesz); |