diff options
| author | Joachim Fenkes <fenkes@de.ibm.com> | 2007-09-13 18:15:28 +0200 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-10-09 19:59:13 -0700 |
| commit | c8d8beea0383e47c9d65d45f0ca95626ec435fcd (patch) | |
| tree | 00f409205683f3489344eb0cf1b86f8091354fc7 | |
| parent | 247e020ee5e2a7bf46f2d7a3d4490a670a712a40 (diff) | |
IB/umem: Add hugetlb flag to struct ib_umem
During ib_umem_get(), determine whether all pages from the memory
region are hugetlb pages and report this in the "hugetlb" member.
Low-level drivers can use this information if they need it.
Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
| -rw-r--r-- | drivers/infiniband/core/umem.c | 20 | ||||
| -rw-r--r-- | include/rdma/ib_umem.h | 1 |
2 files changed, 20 insertions, 1 deletions
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 664d2faa9e74..2f54e29dc7a6 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -37,6 +37,7 @@ #include <linux/mm.h> #include <linux/dma-mapping.h> #include <linux/sched.h> +#include <linux/hugetlb.h> #include "uverbs.h" @@ -75,6 +76,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, { struct ib_umem *umem; struct page **page_list; + struct vm_area_struct **vma_list; struct ib_umem_chunk *chunk; unsigned long locked; unsigned long lock_limit; @@ -104,6 +106,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, */ umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ); + /* We assume the memory is from hugetlb until proved otherwise */ + umem->hugetlb = 1; + INIT_LIST_HEAD(&umem->chunk_list); page_list = (struct page **) __get_free_page(GFP_KERNEL); @@ -112,6 +117,14 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, return ERR_PTR(-ENOMEM); } + /* + * if we can't alloc the vma_list, it's not so bad; + * just assume the memory is not hugetlb memory + */ + vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL); + if (!vma_list) + umem->hugetlb = 0; + npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT; down_write(¤t->mm->mmap_sem); @@ -131,7 +144,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, ret = get_user_pages(current, current->mm, cur_base, min_t(int, npages, PAGE_SIZE / sizeof (struct page *)), - 1, !umem->writable, page_list, NULL); + 1, !umem->writable, page_list, vma_list); if (ret < 0) goto out; @@ -152,6 +165,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK); for (i = 0; i < chunk->nents; ++i) { + if (vma_list && + !is_vm_hugetlb_page(vma_list[i + off])) + umem->hugetlb = 0; chunk->page_list[i].page = page_list[i + off]; chunk->page_list[i].offset = 0; chunk->page_list[i].length = PAGE_SIZE; @@ -186,6 +202,8 @@ out: current->mm->locked_vm = locked; up_write(¤t->mm->mmap_sem); + if (vma_list) + free_page((unsigned long) vma_list); free_page((unsigned long) page_list); return ret < 0 ? ERR_PTR(ret) : umem; diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index c533d6c7903f..22298423cf0b 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -45,6 +45,7 @@ struct ib_umem { int offset; int page_size; int writable; + int hugetlb; struct list_head chunk_list; struct work_struct work; struct mm_struct *mm; |