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IB/umem: Add hugetlb flag to struct ib_umem

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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>
This commit is contained in:
Joachim Fenkes 2007-09-13 18:15:28 +02:00 committed by Roland Dreier
parent 247e020ee5
commit c8d8beea03
2 changed files with 20 additions and 1 deletions
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20
drivers/infiniband/core/umem.c
View File

@ -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(&current->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 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
current->mm->locked_vm = locked;
up_write(&current->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;

1
include/rdma/ib_umem.h
View File

@ -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;