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authorShachar Raindel <raindel@mellanox.com>2014-12-11 18:04:17 +0300
committerRoland Dreier <roland@purestorage.com>2014-12-16 05:13:36 +0300
commit8ada2c1c0c1d75a60723cd2ca7d49c594a146af6 (patch)
treea80d10bb8cf4888a7f6313698a40980de5724b51 /include/rdma/ib_umem.h
parent860f10a799c83e38a69d5a69d80da5312a4c4106 (diff)
downloadlinux-8ada2c1c0c1d75a60723cd2ca7d49c594a146af6.tar.xz
IB/core: Add support for on demand paging regions
* Extend the umem struct to keep the ODP related data. * Allocate and initialize the ODP related information in the umem (page_list, dma_list) and freeing as needed in the end of the run. * Store a reference to the process PID struct in the ucontext. Used to safely obtain the task_struct and the mm during fault handling, without preventing the task destruction if needed. * Add 2 helper functions: ib_umem_odp_map_dma_pages and ib_umem_odp_unmap_dma_pages. These functions get the DMA addresses of specific pages of the umem (and, currently, pin them). * Support for page faults only - IB core will keep the reference on the pages used and call put_page when freeing an ODP umem area. Invalidations support will be added in a later patch. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Majd Dibbiny <majd@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'include/rdma/ib_umem.h')
-rw-r--r--include/rdma/ib_umem.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index a51f4091489a..2d83cfd7e6ce 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -38,6 +38,7 @@
#include <linux/workqueue.h>
struct ib_ucontext;
+struct ib_umem_odp;
struct ib_umem {
struct ib_ucontext *context;
@@ -50,6 +51,7 @@ struct ib_umem {
struct pid *pid;
struct mm_struct *mm;
unsigned long diff;
+ struct ib_umem_odp *odp_data;
struct sg_table sg_head;
int nmap;
int npages;