IB/qib: Remove DMA mapping code

The qib DMA mapping code is no longer built since commit eb636ac0
("IB/qib: Remove dma.c and use rdmavt version of dma functions"). Hence
remove it.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Marciniszyn <mike.marciniszyn@intel.com>
Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qib/qib_dma.c

-/*
- * Copyright (c) 2006, 2009, 2010 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 <linux/types.h>
-#include <linux/scatterlist.h>
-
-#include "qib_verbs.h"
-
-#define BAD_DMA_ADDRESS ((u64) 0)
-
-/*
- * The following functions implement driver specific replacements
- * for the ib_dma_*() functions.
- *
- * These functions return kernel virtual addresses instead of
- * device bus addresses since the driver uses the CPU to copy
- * data instead of using hardware DMA.
- */
-
-static int qib_mapping_error(struct ib_device *dev, u64 dma_addr)
-{
-	return dma_addr == BAD_DMA_ADDRESS;
-}
-
-static u64 qib_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) cpu_addr;
-}
-
-static void qib_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 qib_dma_map_page(struct ib_device *dev, struct page *page,
-			    unsigned long offset, size_t size,
-			    enum dma_data_direction direction)
-{
-	u64 addr;
-
-	BUG_ON(!valid_dma_direction(direction));
-
-	if (offset + size > PAGE_SIZE) {
-		addr = BAD_DMA_ADDRESS;
-		goto done;
-	}
-
-	addr = (u64) page_address(page);
-	if (addr)
-		addr += offset;
-	/* TODO: handle highmem pages */
-
-done:
-	return addr;
-}
-
-static void qib_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 qib_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 = (u64) page_address(sg_page(sg));
-		/* TODO: handle highmem pages */
-		if (!addr) {
-			ret = 0;
-			break;
-		}
-		sg->dma_address = addr + sg->offset;
-#ifdef CONFIG_NEED_SG_DMA_LENGTH
-		sg->dma_length = sg->length;
-#endif
-	}
-	return ret;
-}
-
-static void qib_unmap_sg(struct ib_device *dev,
-			 struct scatterlist *sg, int nents,
-			 enum dma_data_direction direction)
-{
-	BUG_ON(!valid_dma_direction(direction));
-}
-
-static void qib_sync_single_for_cpu(struct ib_device *dev, u64 addr,
-				    size_t size, enum dma_data_direction dir)
-{
-}
-
-static void qib_sync_single_for_device(struct ib_device *dev, u64 addr,
-				       size_t size,
-				       enum dma_data_direction dir)
-{
-}
-
-static void *qib_dma_alloc_coherent(struct ib_device *dev, size_t size,
-				    u64 *dma_handle, gfp_t flag)
-{
-	struct page *p;
-	void *addr = NULL;
-
-	p = alloc_pages(flag, get_order(size));
-	if (p)
-		addr = page_address(p);
-	if (dma_handle)
-		*dma_handle = (u64) addr;
-	return addr;
-}
-
-static void qib_dma_free_coherent(struct ib_device *dev, size_t size,
-				  void *cpu_addr, u64 dma_handle)
-{
-	free_pages((unsigned long) cpu_addr, get_order(size));
-}
-
-struct ib_dma_mapping_ops qib_dma_mapping_ops = {
-	.mapping_error = qib_mapping_error,
-	.map_single = qib_dma_map_single,
-	.unmap_single = qib_dma_unmap_single,
-	.map_page = qib_dma_map_page,
-	.unmap_page = qib_dma_unmap_page,
-	.map_sg = qib_map_sg,
-	.unmap_sg = qib_unmap_sg,
-	.sync_single_for_cpu = qib_sync_single_for_cpu,
-	.sync_single_for_device = qib_sync_single_for_device,
-	.alloc_coherent = qib_dma_alloc_coherent,
-	.free_coherent = qib_dma_free_coherent
-};

drivers/infiniband/hw/qib/qib_keys.c

@@ -158,10 +158,7 @@ int qib_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
 	unsigned n, m;
 	size_t off;
 
-	/*
-	 * We use RKEY == zero for kernel virtual addresses
-	 * (see qib_get_dma_mr and qib_dma.c).
-	 */
+	/* We use RKEY == zero for kernel virtual addresses */
 	rcu_read_lock();
 	if (rkey == 0) {
 		struct rvt_pd *pd = ibpd_to_rvtpd(qp->ibqp.pd);