Dummy dma processing for rxe device.
Signed-off-by: Bob Pearson rpear...@systemfabricworks.com
---
drivers/infiniband/hw/rxe/rxe_dma.c | 178
1 file changed, 178 insertions(+)
Index: infiniband/drivers/infiniband/hw/rxe/rxe_dma.c
===
--- /dev/null
+++ infiniband/drivers/infiniband/hw/rxe/rxe_dma.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2009-2011 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2009-2011 System Fabric Works, Inc. All rights reserved.
+ * Copyright (c) 2006 QLogic, Corporation. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include rxe.h
+#include rxe_loc.h
+
+static int rxe_mapping_error(struct ib_device *dev, u64 dma_addr)
+{
+ return dma_addr == 0;
+}
+
+static u64 rxe_dma_map_single(struct ib_device *dev,
+ void *cpu_addr, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+ return (u64) (uintptr_t) cpu_addr;
+}
+
+static void rxe_dma_unmap_single(struct ib_device *dev,
+u64 addr, size_t size,
+enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+}
+
+static u64 rxe_dma_map_page(struct ib_device *dev,
+ struct page *page,
+ unsigned long offset,
+ size_t size, enum dma_data_direction direction)
+{
+ u64 addr = 0;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ if (offset + size PAGE_SIZE)
+ goto out;
+
+ addr = (uintptr_t) page_address(page);
+ if (addr)
+ addr += offset;
+
+out:
+ return addr;
+}
+
+static void rxe_dma_unmap_page(struct ib_device *dev,
+ u64 addr, size_t size,
+ enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+}
+
+static int rxe_map_sg(struct ib_device *dev, struct scatterlist *sgl,
+ int nents, enum dma_data_direction direction)
+{
+ struct scatterlist *sg;
+ u64 addr;
+ int i;
+ int ret = nents;
+
+ BUG_ON(!valid_dma_direction(direction));
+
+ for_each_sg(sgl, sg, nents, i) {
+ addr = (uintptr_t) page_address(sg_page(sg));
+ /* TODO: handle highmem pages */
+ if (!addr) {
+ ret = 0;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void rxe_unmap_sg(struct ib_device *dev,
+struct scatterlist *sg, int nents,
+enum dma_data_direction direction)
+{
+ BUG_ON(!valid_dma_direction(direction));
+}
+
+static u64 rxe_sg_dma_address(struct ib_device *dev, struct scatterlist *sg)
+{
+ u64 addr = (uintptr_t) page_address(sg_page(sg));
+
+ if (addr)
+ addr += sg-offset;
+
+ return addr;
+}
+
+static unsigned int rxe_sg_dma_len(struct ib_device *dev,
+ struct scatterlist *sg)
+{
+ return sg-length;
+}
+
+static void rxe_sync_single_for_cpu(struct ib_device *dev,
+ u64 addr,
+ size_t size, enum dma_data_direction dir)
+{
+}
+
+static void rxe_sync_single_for_device(struct ib_device *dev,
+ u64 addr,
+ size_t size, enum dma_data_direction dir)
+{
+}
+
