Message-Id: <1308228169-22771-1-git-send-email-bmt@zurich.ibm.com>
Date:	Thu, 16 Jun 2011 14:42:49 +0200
From:	Bernard Metzler <bmt@...ich.ibm.com>
To:	netdev@...r.kernel.org
Cc:	linux-rdma@...r.kernel.org, Bernard Metzler <bmt@...ich.ibm.com>
Subject: [PATCH 13/14] SIWv2: Memory management: siw_mem.c

---
 drivers/infiniband/hw/siw/siw_mem.c |  180 +++++++++++++++++++++++++++++++++++
 1 files changed, 180 insertions(+), 0 deletions(-)
 create mode 100644 drivers/infiniband/hw/siw/siw_mem.c

diff --git a/drivers/infiniband/hw/siw/siw_mem.c b/drivers/infiniband/hw/siw/siw_mem.c
new file mode 100644
index 0000000..8a3d65d
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_mem.c
@@ -0,0 +1,180 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Animesh Trivedi <atr@...ich.ibm.com>
+ *          Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2011, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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 <linux/scatterlist.h>
+#include <linux/gfp.h>
+#include <rdma/ib_verbs.h>
+
+#include "siw.h"
+#include "siw_verbs.h"
+
+/*
+ * DMA mapping/address translation functions.
+ * Used to populate siw private DMA mapping functions of
+ * struct ib_dma_mapping_ops in struct ib_dev - see rdma/ib_verbs.h
+ */
+
+static int siw_mapping_error(struct ib_device *dev, u64 dma_addr)
+{
+	return dma_addr == 0;
+}
+
+static u64 siw_dma_map_single(struct ib_device *dev, void *kva, size_t size,
+			       enum dma_data_direction dir)
+{
+	/* siw uses kernel virtual addresses for data transfer */
+	return (u64) kva;
+}
+
+static void siw_dma_unmap_single(struct ib_device *dev,
+				 u64 addr, size_t size,
+				 enum dma_data_direction dir)
+{
+	/* NOP */
+}
+
+static u64 siw_dma_map_page(struct ib_device *dev, struct page *page,
+			    unsigned long offset, size_t size,
+			    enum dma_data_direction dir)
+{
+	u64 kva = 0;
+
+	BUG_ON(!valid_dma_direction(dir));
+
+	if (offset + size <= PAGE_SIZE) {
+		kva = (u64) page_address(page);
+		if (kva)
+			kva += offset;
+	}
+	return kva;
+}
+
+static void siw_dma_unmap_page(struct ib_device *dev,
+			       u64 addr, size_t size,
+			       enum dma_data_direction dir)
+{
+	/* NOP */
+}
+
+static int siw_map_sg(struct ib_device *dev, struct scatterlist *sgl,
+		      int n_sge, enum dma_data_direction dir)
+{
+	struct scatterlist *sg;
+	int i;
+
+	BUG_ON(!valid_dma_direction(dir));
+
+	/* This is just a validity check */
+	for_each_sg(sgl, sg, n_sge, i)
+		if (page_address(sg_page(sg)) == NULL)
+			return 0;
+
+	return n_sge;
+}
+
+static void siw_unmap_sg(struct ib_device *dev, struct scatterlist *sgl,
+			 int n_sge, enum dma_data_direction dir)
+{
+	/* NOP */
+}
+
+static u64 siw_dma_address(struct ib_device *dev, struct scatterlist *sg)
+{
+	u64 kva = (u64) page_address(sg_page(sg));
+
+	if (kva)
+		kva += sg->offset;
+
+	return kva;
+}
+
+static unsigned int siw_dma_len(struct ib_device *dev,
+				   struct scatterlist *sg)
+{
+	return sg_dma_len(sg);
+}
+
+static void siw_sync_single_for_cpu(struct ib_device *dev, u64 addr,
+				    size_t size, enum dma_data_direction dir)
+{
+	/* NOP */
+}
+
+static void siw_sync_single_for_device(struct ib_device *dev, u64 addr,
+				       size_t size,
+				       enum dma_data_direction dir)
+{
+	/* NOP */
+}
+
+static void *siw_dma_alloc_coherent(struct ib_device *dev, size_t size,
+				    u64 *dma_addr, gfp_t flag)
+{
+	struct page *page;
+	void *kva = NULL;
+
+	page = alloc_pages(flag, get_order(size));
+	if (page)
+		kva = page_address(page);
+	if (dma_addr)
+		*dma_addr = (u64)kva;
+
+	return kva;
+}
+
+static void siw_dma_free_coherent(struct ib_device *dev, size_t size,
+				  void *kva, u64 dma_addr)
+{
+	free_pages((unsigned long) kva, get_order(size));
+}
+
+struct ib_dma_mapping_ops siw_dma_mapping_ops = {
+	.mapping_error		= siw_mapping_error,
+	.map_single		= siw_dma_map_single,
+	.unmap_single		= siw_dma_unmap_single,
+	.map_page		= siw_dma_map_page,
+	.unmap_page		= siw_dma_unmap_page,
+	.map_sg			= siw_map_sg,
+	.unmap_sg		= siw_unmap_sg,
+	.dma_address		= siw_dma_address,
+	.dma_len		= siw_dma_len,
+	.sync_single_for_cpu	= siw_sync_single_for_cpu,
+	.sync_single_for_device	= siw_sync_single_for_device,
+	.alloc_coherent		= siw_dma_alloc_coherent,
+	.free_coherent		= siw_dma_free_coherent
+};
-- 
1.5.4.3

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