Use the dma_flags_set_dmabarrier() interface to allow a "dmabarrier"

attribute to be associated with user-allocated memory. (For now,

it's only implemented for mthca.)
Signed-off-by: Arthur Kepner <akepner@sgi.com>
---

 drivers/infiniband/core/umem.c               |    7 +++++--

 drivers/infiniband/hw/amso1100/c2_provider.c |    2 +-

 drivers/infiniband/hw/cxgb3/iwch_provider.c  |    2 +-

 drivers/infiniband/hw/ehca/ehca_mrmw.c       |    2 +-

 drivers/infiniband/hw/ipath/ipath_mr.c       |    2 +-

 drivers/infiniband/hw/mlx4/cq.c              |    2 +-

 drivers/infiniband/hw/mlx4/doorbell.c        |    2 +-

 drivers/infiniband/hw/mlx4/mr.c              |    3 ++-

 drivers/infiniband/hw/mlx4/qp.c              |    2 +-

 drivers/infiniband/hw/mlx4/srq.c             |    2 +-

 drivers/infiniband/hw/mthca/mthca_provider.c |    7 ++++++-

 drivers/infiniband/hw/mthca/mthca_user.h     |   10 +++++++++-

 include/rdma/ib_umem.h                       |    4 ++--

 13 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c

index 664d2fa..5b30b0c 100644

--- a/drivers/infiniband/core/umem.c

+++ b/drivers/infiniband/core/umem.c

@@ -69,9 +69,10 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d

  * @addr: userspace virtual address to start at

  * @size: length of region to pin

  * @access: IB_ACCESS_xxx flags for memory being pinned

+ * @dmabarrier: set "dmabarrier" attribute on this memory, if necessary

  */

 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,

-			    size_t size, int access)

+			    size_t size, int access, int dmabarrier)

 {

 	struct ib_umem *umem;

 	struct page **page_list;

@@ -83,6 +84,8 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,

 	int ret;

 	int off;

 	int i;

+	int flags = dmabarrier ? dma_flags_set_dmabarrier(DMA_BIDIRECTIONAL):

+			DMA_BIDIRECTIONAL;
 	if (!can_do_mlock())

 		retu...
[ message continues ]

Sorry for not mentioning this earlier, but this patch should really be

two (or more) patches: one to add dmabarrier support to the core user

memory stuff in drivers/infiniband, and a second one to add support to

mthca (and more patches to add support to mlx4, cxgb3, etc, etc).
 > + * @dmabarrier: set "dmabarrier" attribute on this memory, if necessary 
Nit: just delete the "if necessary" since I don't think it makes

things clearer (and actually doesn't make much sense in this context)
Other than that this look fine to me, and I'm ready to merge it once

the necessary core DMA stuff is settled.
 - R.

-

Great. A new version of the patchset is on the way.
--

Arthur
-