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author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 13:26:25 (GMT) |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-11 11:53:55 (GMT) |
commit | 484837601d4dd048d1f8d2cedd39934bb3ad6d59 (patch) | |
tree | d42a4ce2e1ccfd344743e71ec803cf1e245a2d1f /arch/powerpc/mm/hugetlbpage-radix.c | |
parent | 2f5f0dfd1e5f9840560e85ad26cb4a6f06c19e07 (diff) | |
download | linux-484837601d4dd048d1f8d2cedd39934bb3ad6d59.tar.xz |
powerpc/mm: Add radix support for hugetlb
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage-radix.c')
-rw-r--r-- | arch/powerpc/mm/hugetlbpage-radix.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hugetlbpage-radix.c b/arch/powerpc/mm/hugetlbpage-radix.c new file mode 100644 index 0000000..1e11559 --- /dev/null +++ b/arch/powerpc/mm/hugetlbpage-radix.c @@ -0,0 +1,87 @@ +#include <linux/mm.h> +#include <linux/hugetlb.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/cacheflush.h> +#include <asm/machdep.h> +#include <asm/mman.h> + +void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr) +{ + unsigned long ap, shift; + struct hstate *hstate = hstate_file(vma->vm_file); + + shift = huge_page_shift(hstate); + if (shift == mmu_psize_defs[MMU_PAGE_2M].shift) + ap = mmu_get_ap(MMU_PAGE_2M); + else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift) + ap = mmu_get_ap(MMU_PAGE_1G); + else { + WARN(1, "Wrong huge page shift\n"); + return ; + } + radix___flush_tlb_page(vma->vm_mm, vmaddr, ap, 0); +} + +void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr) +{ + unsigned long ap, shift; + struct hstate *hstate = hstate_file(vma->vm_file); + + shift = huge_page_shift(hstate); + if (shift == mmu_psize_defs[MMU_PAGE_2M].shift) + ap = mmu_get_ap(MMU_PAGE_2M); + else if (shift == mmu_psize_defs[MMU_PAGE_1G].shift) + ap = mmu_get_ap(MMU_PAGE_1G); + else { + WARN(1, "Wrong huge page shift\n"); + return ; + } + radix___local_flush_tlb_page(vma->vm_mm, vmaddr, ap, 0); +} + +/* + * A vairant of hugetlb_get_unmapped_area doing topdown search + * FIXME!! should we do as x86 does or non hugetlb area does ? + * ie, use topdown or not based on mmap_is_legacy check ? + */ +unsigned long +radix__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; + struct hstate *h = hstate_file(file); + struct vm_unmapped_area_info info; + + 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)); + vma = find_vma(mm, addr); + if (TASK_SIZE - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + /* + * We are always doing an topdown search here. Slice code + * does that too. + */ + info.flags = VM_UNMAPPED_AREA_TOPDOWN; + info.length = len; + info.low_limit = PAGE_SIZE; + info.high_limit = current->mm->mmap_base; + info.align_mask = PAGE_MASK & ~huge_page_mask(h); + info.align_offset = 0; + return vm_unmapped_area(&info); +} |