Commit 0bbb3b74 authored by Bart Van Assche's avatar Bart Van Assche Committed by Doug Ledford
Browse files

IB/rxe, IB/rdmavt: Use dma_virt_ops instead of duplicating it 



Make the rxe and rdmavt drivers use dma_virt_ops. Update the
comments that refer to the source files removed by this patch.
Remove struct ib_dma_mapping_ops. Remove ib_device.dma_ops.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Cc: Andrew Boyer <andrew.boyer@dell.com>
Cc: Dennis Dalessandro <dennis.dalessandro@intel.com>
Cc: Jonathan Toppins <jtoppins@redhat.com>
Cc: Alex Estrin <alex.estrin@intel.com>
Cc: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 99db9494

drivers/infiniband/sw/rdmavt/Kconfig

+1 −0
Original line number Diff line number Diff line 
config INFINIBAND_RDMAVT

	tristate "RDMA verbs transport library"

	depends on 64BIT

	select DMA_VIRT_OPS

	---help---

	This is a common software verbs provider for RDMA networks.

drivers/infiniband/sw/rdmavt/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
#

obj-$(CONFIG_INFINIBAND_RDMAVT) += rdmavt.o



rdmavt-y := vt.o ah.o cq.o dma.o mad.o mcast.o mmap.o mr.o pd.o qp.o srq.o \

rdmavt-y := vt.o ah.o cq.o mad.o mcast.o mmap.o mr.o pd.o qp.o srq.o \

	trace.o



CFLAGS_trace.o = -I$(src)

drivers/infiniband/sw/rdmavt/dma.c

deleted100644 → 0
+0 −198
Original line number Diff line number Diff line 
/*

 * Copyright(c) 2016 Intel Corporation.

 *

 * This file is provided under a dual BSD/GPLv2 license.  When using or

 * redistributing this file, you may do so under either license.

 *

 * GPL LICENSE SUMMARY

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * BSD LICENSE

 *

 * 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 Intel Corporation nor the names of its

 *    contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */

#include <linux/types.h>

#include <linux/scatterlist.h>

#include <rdma/ib_verbs.h>



#include "dma.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 rvt_mapping_error(struct ib_device *dev, u64 dma_addr)

{

	return dma_addr == BAD_DMA_ADDRESS;

}



static u64 rvt_dma_map_single(struct ib_device *dev, void *cpu_addr,

			      size_t size, enum dma_data_direction direction)

{

	if (WARN_ON(!valid_dma_direction(direction)))

		return BAD_DMA_ADDRESS;



	return (u64)cpu_addr;

}



static void rvt_dma_unmap_single(struct ib_device *dev, u64 addr, size_t size,

				 enum dma_data_direction direction)

{

	/* This is a stub, nothing to be done here */

}



static u64 rvt_dma_map_page(struct ib_device *dev, struct page *page,

			    unsigned long offset, size_t size,

			    enum dma_data_direction direction)

{

	u64 addr;



	if (WARN_ON(!valid_dma_direction(direction)))

		return BAD_DMA_ADDRESS;



	addr = (u64)page_address(page);

	if (addr)

		addr += offset;



	return addr;

}



static void rvt_dma_unmap_page(struct ib_device *dev, u64 addr, size_t size,

			       enum dma_data_direction direction)

{

	/* This is a stub, nothing to be done here */

}



static int rvt_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;



	if (WARN_ON(!valid_dma_direction(direction)))

		return 0;



	for_each_sg(sgl, sg, nents, i) {

		addr = (u64)page_address(sg_page(sg));

		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 rvt_unmap_sg(struct ib_device *dev,

			 struct scatterlist *sg, int nents,

			 enum dma_data_direction direction)

{

	/* This is a stub, nothing to be done here */

}



static int rvt_map_sg_attrs(struct ib_device *dev, struct scatterlist *sgl,

			    int nents, enum dma_data_direction direction,

			    unsigned long attrs)

{

	return rvt_map_sg(dev, sgl, nents, direction);

}



static void rvt_unmap_sg_attrs(struct ib_device *dev,

			       struct scatterlist *sg, int nents,

			       enum dma_data_direction direction,

			       unsigned long attrs)

{

	return rvt_unmap_sg(dev, sg, nents, direction);

}



static void rvt_sync_single_for_cpu(struct ib_device *dev, u64 addr,

				    size_t size, enum dma_data_direction dir)

{

}



static void rvt_sync_single_for_device(struct ib_device *dev, u64 addr,

				       size_t size,

				       enum dma_data_direction dir)

{

}



static void *rvt_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 rvt_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 rvt_default_dma_mapping_ops = {

	.mapping_error = rvt_mapping_error,

	.map_single = rvt_dma_map_single,

	.unmap_single = rvt_dma_unmap_single,

	.map_page = rvt_dma_map_page,

	.unmap_page = rvt_dma_unmap_page,

	.map_sg = rvt_map_sg,

	.unmap_sg = rvt_unmap_sg,

	.map_sg_attrs = rvt_map_sg_attrs,

	.unmap_sg_attrs = rvt_unmap_sg_attrs,

	.sync_single_for_cpu = rvt_sync_single_for_cpu,

	.sync_single_for_device = rvt_sync_single_for_device,

	.alloc_coherent = rvt_dma_alloc_coherent,

	.free_coherent = rvt_dma_free_coherent

};

drivers/infiniband/sw/rdmavt/dma.h

deleted100644 → 0
+0 −53
Original line number Diff line number Diff line 
#ifndef DEF_RDMAVTDMA_H

#define DEF_RDMAVTDMA_H



/*

 * Copyright(c) 2016 Intel Corporation.

 *

 * This file is provided under a dual BSD/GPLv2 license.  When using or

 * redistributing this file, you may do so under either license.

 *

 * GPL LICENSE SUMMARY

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * BSD LICENSE

 *

 * 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 Intel Corporation nor the names of its

 *    contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */



extern struct ib_dma_mapping_ops rvt_default_dma_mapping_ops;



#endif          /* DEF_RDMAVTDMA_H */

drivers/infiniband/sw/rdmavt/mr.c

+4 −4
Original line number Diff line number Diff line
@@ -305,8 +305,8 @@ static void __rvt_free_mr(struct rvt_mr *mr) 
 * @acc: access flags

 *

 * Return: the memory region on success, otherwise returns an errno.

 * Note that all DMA addresses should be created via the

 * struct ib_dma_mapping_ops functions (see dma.c).

 * Note that all DMA addresses should be created via the functions in

 * struct dma_virt_ops.

 */

struct ib_mr *rvt_get_dma_mr(struct ib_pd *pd, int acc)

{
@@ -782,7 +782,7 @@ int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, 


	/*

	 * We use LKEY == zero for kernel virtual addresses

	 * (see rvt_get_dma_mr and dma.c).

	 * (see rvt_get_dma_mr() and dma_virt_ops).

	 */

	rcu_read_lock();

	if (sge->lkey == 0) {
@@ -880,7 +880,7 @@ int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge, 


	/*

	 * We use RKEY == zero for kernel virtual addresses

	 * (see rvt_get_dma_mr and dma.c).

	 * (see rvt_get_dma_mr() and dma_virt_ops).

	 */

	rcu_read_lock();

	if (rkey == 0) {

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