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Date: Tue, 29 Jan 2008 21:54:29 -0800
From: akepner@....com
To: Tony Luck <tony.luck@...el.com>,
Grant Grundler <grundler@...isc-linux.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
Jes Sorensen <jes@....com>,
Randy Dunlap <randy.dunlap@...cle.com>,
Roland Dreier <rdreier@...co.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
David Miller <davem@...emloft.net>,
Muli Ben-Yehuda <muli@...ibm.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] IB: introducing MTHCA_MR_DMABARRIER
Add MTHCA_MR_DMABARRIER to mthca's API, increment ABI version,
and make use of MTHCA_MR_DMABARRIER when mapping a user-allocated
memory region with ib_umem_get().
Signed-off-by: Arthur Kepner <akepner@....com>
--
drivers/infiniband/core/umem.c | 15 +++++++++---
drivers/infiniband/hw/mthca/mthca_provider.c | 7 ++++-
drivers/infiniband/hw/mthca/mthca_user.h | 10 +++++++-
include/rdma/ib_verbs.h | 33 +++++++++++++++++++++++++++
4 files changed, 59 insertions(+), 6 deletions(-)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 5b00408..57b5ce9 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -38,6 +38,7 @@
#include <linux/dma-mapping.h>
#include <linux/sched.h>
#include <linux/hugetlb.h>
+#include <linux/dma-attrs.h>
#include "uverbs.h"
@@ -72,6 +73,8 @@ 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 a "dma barrier" so that in-flight DMA is
+ * flushed when the memory region is written to
*/
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
size_t size, int access, int dmabarrier)
@@ -87,6 +90,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
int ret;
int off;
int i;
+ struct dma_attrs attrs;
+
+ dma_set_attr(&attrs, dmabarrier ? DMA_ATTR_BARRIER : 0);
if (!can_do_mlock())
return ERR_PTR(-EPERM);
@@ -174,10 +180,11 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
sg_set_page(&chunk->page_list[i], page_list[i + off], PAGE_SIZE, 0);
}
- chunk->nmap = ib_dma_map_sg(context->device,
- &chunk->page_list[0],
- chunk->nents,
- DMA_BIDIRECTIONAL);
+ chunk->nmap = ib_dma_map_sg_attrs(context->device,
+ &chunk->page_list[0],
+ chunk->nents,
+ DMA_BIDIRECTIONAL,
+ &attrs);
if (chunk->nmap <= 0) {
for (i = 0; i < chunk->nents; ++i)
put_page(sg_page(&chunk->page_list[i]));
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 704d8ef..e837cc9 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -1017,17 +1017,22 @@ static struct ib_mr *mthca_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
struct mthca_dev *dev = to_mdev(pd->device);
struct ib_umem_chunk *chunk;
struct mthca_mr *mr;
+ struct mthca_reg_mr ucmd;
u64 *pages;
int shift, n, len;
int i, j, k;
int err = 0;
int write_mtt_size;
+ if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
+ return ERR_PTR(-EFAULT);
+
mr = kmalloc(sizeof *mr, GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
- mr->umem = ib_umem_get(pd->uobject->context, start, length, acc, 0);
+ mr->umem = ib_umem_get(pd->uobject->context, start, length, acc,
+ ucmd.mr_attrs & MTHCA_MR_DMABARRIER);
if (IS_ERR(mr->umem)) {
err = PTR_ERR(mr->umem);
diff --git a/drivers/infiniband/hw/mthca/mthca_user.h b/drivers/infiniband/hw/mthca/mthca_user.h
index 02cc0a7..701a430 100644
--- a/drivers/infiniband/hw/mthca/mthca_user.h
+++ b/drivers/infiniband/hw/mthca/mthca_user.h
@@ -41,7 +41,7 @@
* Increment this value if any changes that break userspace ABI
* compatibility are made.
*/
-#define MTHCA_UVERBS_ABI_VERSION 1
+#define MTHCA_UVERBS_ABI_VERSION 2
/*
* Make sure that all structs defined in this file remain laid out so
@@ -61,6 +61,14 @@ struct mthca_alloc_pd_resp {
__u32 reserved;
};
+struct mthca_reg_mr {
+ __u32 mr_attrs;
+#define MTHCA_MR_DMABARRIER 0x1 /* set a dma barrier in order to flush
+ * in-flight DMA on a write to memory
+ * region */
+ __u32 reserved;
+};
+
struct mthca_create_cq {
__u32 lkey;
__u32 pdn;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 11f3960..ac869e2 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1507,6 +1507,24 @@ static inline void ib_dma_unmap_single(struct ib_device *dev,
dma_unmap_single(dev->dma_device, addr, size, direction);
}
+static inline u64 ib_dma_map_single_attrs(struct ib_device *dev,
+ void *cpu_addr, size_t size,
+ enum dma_data_direction direction,
+ struct dma_attrs *attrs)
+{
+ return dma_map_single_attrs(dev->dma_device, cpu_addr, size,
+ direction, attrs);
+}
+
+static inline void ib_dma_unmap_single_attrs(struct ib_device *dev,
+ u64 addr, size_t size,
+ enum dma_data_direction direction,
+ struct dma_attrs *attrs)
+{
+ return dma_unmap_single_attrs(dev->dma_device, addr, size,
+ direction, attrs);
+}
+
/**
* ib_dma_map_page - Map a physical page to DMA address
* @dev: The device for which the dma_addr is to be created
@@ -1576,6 +1594,21 @@ static inline void ib_dma_unmap_sg(struct ib_device *dev,
dma_unmap_sg(dev->dma_device, sg, nents, direction);
}
+static inline int ib_dma_map_sg_attrs(struct ib_device *dev,
+ struct scatterlist *sg, int nents,
+ enum dma_data_direction direction,
+ struct dma_attrs *attrs)
+{
+ return dma_map_sg_attrs(dev->dma_device, sg, nents, direction, attrs);
+}
+
+static inline void ib_dma_unmap_sg_attrs(struct ib_device *dev,
+ struct scatterlist *sg, int nents,
+ enum dma_data_direction direction,
+ struct dma_attrs *attrs)
+{
+ dma_unmap_sg_attrs(dev->dma_device, sg, nents, direction, attrs);
+}
/**
* ib_sg_dma_address - Return the DMA address from a scatter/gather entry
* @dev: The device for which the DMA addresses were created
--
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