drivers/infiniband/hw/ipath/ipath_keys.c - kernel/lockdown - Git at Google

 /*
  * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
  * Copyright (c) 2005, 2006 PathScale, Inc. 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 <asm/io.h>

 #include "ipath_verbs.h"
 #include "ipath_kernel.h"

 /**
  * ipath_alloc_lkey - allocate an lkey
  * @rkt: lkey table in which to allocate the lkey
  * @mr: memory region that this lkey protects
  *
  * Returns 1 if successful, otherwise returns 0.
  */

 int ipath_alloc_lkey(struct ipath_lkey_table *rkt, struct ipath_mregion *mr)
 {
 	unsigned long flags;
 	u32 r;
 	u32 n;
 	int ret;

 	spin_lock_irqsave(&rkt->lock, flags);

 	/* Find the next available LKEY */
 	r = n = rkt->next;
 	for (;;) {
 		if (rkt->table[r] == NULL)
 			break;
 		r = (r + 1) & (rkt->max - 1);
 		if (r == n) {
 			spin_unlock_irqrestore(&rkt->lock, flags);
 			ipath_dbg("LKEY table full\n");
 			ret = 0;
 			goto bail;
 		}
 	}
 	rkt->next = (r + 1) & (rkt->max - 1);
 	/*
 	 * Make sure lkey is never zero which is reserved to indicate an
 	 * unrestricted LKEY.
 	 */
 	rkt->gen++;
 	mr->lkey = (r << (32 - ib_ipath_lkey_table_size)) |
 		((((1 << (24 - ib_ipath_lkey_table_size)) - 1) & rkt->gen)
 		 << 8);
 	if (mr->lkey == 0) {
 		mr->lkey |= 1 << 8;
 		rkt->gen++;
 	}
 	rkt->table[r] = mr;
 	spin_unlock_irqrestore(&rkt->lock, flags);

 	ret = 1;

 bail:
 	return ret;
 }

 /**
  * ipath_free_lkey - free an lkey
  * @rkt: table from which to free the lkey
  * @lkey: lkey id to free
  */
 void ipath_free_lkey(struct ipath_lkey_table *rkt, u32 lkey)
 {
 	unsigned long flags;
 	u32 r;

 	if (lkey == 0)
 		return;
 	r = lkey >> (32 - ib_ipath_lkey_table_size);
 	spin_lock_irqsave(&rkt->lock, flags);
 	rkt->table[r] = NULL;
 	spin_unlock_irqrestore(&rkt->lock, flags);
 }

 /**
  * ipath_lkey_ok - check IB SGE for validity and initialize
  * @rkt: table containing lkey to check SGE against
  * @isge: outgoing internal SGE
  * @sge: SGE to check
  * @acc: access flags
  *
  * Return 1 if valid and successful, otherwise returns 0.
  *
  * Check the IB SGE for validity and initialize our internal version
  * of it.
  */
 int ipath_lkey_ok(struct ipath_qp *qp, struct ipath_sge *isge,
 		  struct ib_sge *sge, int acc)
 {
 	struct ipath_lkey_table *rkt = &to_idev(qp->ibqp.device)->lk_table;
 	struct ipath_mregion *mr;
 	unsigned n, m;
 	size_t off;
 	int ret;

 	/*
 	 * We use LKEY == zero for kernel virtual addresses
 	 * (see ipath_get_dma_mr and ipath_dma.c).
 	 */
 	if (sge->lkey == 0) {
 		/* always a kernel port, no locking needed */
 		struct ipath_pd *pd = to_ipd(qp->ibqp.pd);

 		if (pd->user) {
 			ret = 0;
 			goto bail;
 		}
 		isge->mr = NULL;
 		isge->vaddr = (void *) sge->addr;
 		isge->length = sge->length;
 		isge->sge_length = sge->length;
 		ret = 1;
 		goto bail;
 	}
 	mr = rkt->table[(sge->lkey >> (32 - ib_ipath_lkey_table_size))];
 	if (unlikely(mr == NULL || mr->lkey != sge->lkey ||
 		     qp->ibqp.pd != mr->pd)) {
 		ret = 0;
 		goto bail;
 	}

 	off = sge->addr - mr->user_base;
 	if (unlikely(sge->addr < mr->user_base ||
 		     off + sge->length > mr->length ||
 		     (mr->access_flags & acc) != acc)) {
 		ret = 0;
 		goto bail;
 	}

 	off += mr->offset;
 	m = 0;
 	n = 0;
 	while (off >= mr->map[m]->segs[n].length) {
 		off -= mr->map[m]->segs[n].length;
 		n++;
 		if (n >= IPATH_SEGSZ) {
 			m++;
 			n = 0;
 		}
 	}
 	isge->mr = mr;
 	isge->vaddr = mr->map[m]->segs[n].vaddr + off;
 	isge->length = mr->map[m]->segs[n].length - off;
 	isge->sge_length = sge->length;
 	isge->m = m;
 	isge->n = n;

 	ret = 1;

 bail:
 	return ret;
 }

 /**
  * ipath_rkey_ok - check the IB virtual address, length, and RKEY
  * @dev: infiniband device
  * @ss: SGE state
  * @len: length of data
  * @vaddr: virtual address to place data
  * @rkey: rkey to check
  * @acc: access flags
  *
  * Return 1 if successful, otherwise 0.
  */
 int ipath_rkey_ok(struct ipath_qp *qp, struct ipath_sge_state *ss,
 		  u32 len, u64 vaddr, u32 rkey, int acc)
 {
 	struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
 	struct ipath_lkey_table *rkt = &dev->lk_table;
 	struct ipath_sge *sge = &ss->sge;
 	struct ipath_mregion *mr;
 	unsigned n, m;
 	size_t off;
 	int ret;

 	/*
 	 * We use RKEY == zero for kernel virtual addresses
 	 * (see ipath_get_dma_mr and ipath_dma.c).
 	 */
 	if (rkey == 0) {
 		/* always a kernel port, no locking needed */
 		struct ipath_pd *pd = to_ipd(qp->ibqp.pd);

 		if (pd->user) {
 			ret = 0;
 			goto bail;
 		}
 		sge->mr = NULL;
 		sge->vaddr = (void *) vaddr;
 		sge->length = len;
 		sge->sge_length = len;
 		ss->sg_list = NULL;
 		ss->num_sge = 1;
 		ret = 1;
 		goto bail;
 	}

 	mr = rkt->table[(rkey >> (32 - ib_ipath_lkey_table_size))];
 	if (unlikely(mr == NULL || mr->lkey != rkey ||
 		     qp->ibqp.pd != mr->pd)) {
 		ret = 0;
 		goto bail;
 	}

 	off = vaddr - mr->iova;
 	if (unlikely(vaddr < mr->iova || off + len > mr->length ||
 		     (mr->access_flags & acc) == 0)) {
 		ret = 0;
 		goto bail;
 	}

 	off += mr->offset;
 	m = 0;
 	n = 0;
 	while (off >= mr->map[m]->segs[n].length) {
 		off -= mr->map[m]->segs[n].length;
 		n++;
 		if (n >= IPATH_SEGSZ) {
 			m++;
 			n = 0;
 		}
 	}
 	sge->mr = mr;
 	sge->vaddr = mr->map[m]->segs[n].vaddr + off;
 	sge->length = mr->map[m]->segs[n].length - off;
 	sge->sge_length = len;
 	sge->m = m;
 	sge->n = n;
 	ss->sg_list = NULL;
 	ss->num_sge = 1;

 	ret = 1;

 bail:
 	return ret;
 }
	/*
	* Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
	* Copyright (c) 2005, 2006 PathScale, Inc. 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 <asm/io.h>

	#include "ipath_verbs.h"
	#include "ipath_kernel.h"

	/**
	* ipath_alloc_lkey - allocate an lkey
	* @rkt: lkey table in which to allocate the lkey
	* @mr: memory region that this lkey protects
	*
	* Returns 1 if successful, otherwise returns 0.
	*/

	int ipath_alloc_lkey(struct ipath_lkey_table rkt, struct ipath_mregion mr)
	{
	unsigned long flags;
	u32 r;
	u32 n;
	int ret;

	spin_lock_irqsave(&rkt->lock, flags);

	/* Find the next available LKEY */
	r = n = rkt->next;
	for (;;) {
	if (rkt->table[r] == NULL)
	break;
	r = (r + 1) & (rkt->max - 1);
	if (r == n) {
	spin_unlock_irqrestore(&rkt->lock, flags);
	ipath_dbg("LKEY table full\n");
	ret = 0;
	goto bail;
	}
	}
	rkt->next = (r + 1) & (rkt->max - 1);
	/*
	* Make sure lkey is never zero which is reserved to indicate an
	* unrestricted LKEY.
	*/
	rkt->gen++;
	mr->lkey = (r << (32 - ib_ipath_lkey_table_size)) \|
	((((1 << (24 - ib_ipath_lkey_table_size)) - 1) & rkt->gen)
	<< 8);
	if (mr->lkey == 0) {
	mr->lkey \|= 1 << 8;
	rkt->gen++;
	}
	rkt->table[r] = mr;
	spin_unlock_irqrestore(&rkt->lock, flags);

	ret = 1;

	bail:
	return ret;
	}

	/**
	* ipath_free_lkey - free an lkey
	* @rkt: table from which to free the lkey
	* @lkey: lkey id to free
	*/
	void ipath_free_lkey(struct ipath_lkey_table *rkt, u32 lkey)
	{
	unsigned long flags;
	u32 r;

	if (lkey == 0)
	return;
	r = lkey >> (32 - ib_ipath_lkey_table_size);
	spin_lock_irqsave(&rkt->lock, flags);
	rkt->table[r] = NULL;
	spin_unlock_irqrestore(&rkt->lock, flags);
	}

	/**
	* ipath_lkey_ok - check IB SGE for validity and initialize
	* @rkt: table containing lkey to check SGE against
	* @isge: outgoing internal SGE
	* @sge: SGE to check
	* @acc: access flags
	*
	* Return 1 if valid and successful, otherwise returns 0.
	*
	* Check the IB SGE for validity and initialize our internal version
	* of it.
	*/
	int ipath_lkey_ok(struct ipath_qp qp, struct ipath_sge isge,
	struct ib_sge *sge, int acc)
	{
	struct ipath_lkey_table *rkt = &to_idev(qp->ibqp.device)->lk_table;
	struct ipath_mregion *mr;
	unsigned n, m;
	size_t off;
	int ret;

	/*
	* We use LKEY == zero for kernel virtual addresses
	* (see ipath_get_dma_mr and ipath_dma.c).
	*/
	if (sge->lkey == 0) {
	/* always a kernel port, no locking needed */
	struct ipath_pd *pd = to_ipd(qp->ibqp.pd);

	if (pd->user) {
	ret = 0;
	goto bail;
	}
	isge->mr = NULL;
	isge->vaddr = (void *) sge->addr;
	isge->length = sge->length;
	isge->sge_length = sge->length;
	ret = 1;
	goto bail;
	}
	mr = rkt->table[(sge->lkey >> (32 - ib_ipath_lkey_table_size))];
	if (unlikely(mr == NULL \|\| mr->lkey != sge->lkey \|\|
	qp->ibqp.pd != mr->pd)) {
	ret = 0;
	goto bail;
	}

	off = sge->addr - mr->user_base;
	if (unlikely(sge->addr < mr->user_base \|\|
	off + sge->length > mr->length \|\|
	(mr->access_flags & acc) != acc)) {
	ret = 0;
	goto bail;
	}

	off += mr->offset;
	m = 0;
	n = 0;
	while (off >= mr->map[m]->segs[n].length) {
	off -= mr->map[m]->segs[n].length;
	n++;
	if (n >= IPATH_SEGSZ) {
	m++;
	n = 0;
	}
	}
	isge->mr = mr;
	isge->vaddr = mr->map[m]->segs[n].vaddr + off;
	isge->length = mr->map[m]->segs[n].length - off;
	isge->sge_length = sge->length;
	isge->m = m;
	isge->n = n;

	ret = 1;

	bail:
	return ret;
	}

	/**
	* ipath_rkey_ok - check the IB virtual address, length, and RKEY
	* @dev: infiniband device
	* @ss: SGE state
	* @len: length of data
	* @vaddr: virtual address to place data
	* @rkey: rkey to check
	* @acc: access flags
	*
	* Return 1 if successful, otherwise 0.
	*/
	int ipath_rkey_ok(struct ipath_qp qp, struct ipath_sge_state ss,
	u32 len, u64 vaddr, u32 rkey, int acc)
	{
	struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
	struct ipath_lkey_table *rkt = &dev->lk_table;
	struct ipath_sge *sge = &ss->sge;
	struct ipath_mregion *mr;
	unsigned n, m;
	size_t off;
	int ret;

	/*
	* We use RKEY == zero for kernel virtual addresses
	* (see ipath_get_dma_mr and ipath_dma.c).
	*/
	if (rkey == 0) {
	/* always a kernel port, no locking needed */
	struct ipath_pd *pd = to_ipd(qp->ibqp.pd);

	if (pd->user) {
	ret = 0;
	goto bail;
	}
	sge->mr = NULL;
	sge->vaddr = (void *) vaddr;
	sge->length = len;
	sge->sge_length = len;
	ss->sg_list = NULL;
	ss->num_sge = 1;
	ret = 1;
	goto bail;
	}

	mr = rkt->table[(rkey >> (32 - ib_ipath_lkey_table_size))];
	if (unlikely(mr == NULL \|\| mr->lkey != rkey \|\|
	qp->ibqp.pd != mr->pd)) {
	ret = 0;
	goto bail;
	}

	off = vaddr - mr->iova;
	if (unlikely(vaddr < mr->iova \|\| off + len > mr->length \|\|
	(mr->access_flags & acc) == 0)) {
	ret = 0;
	goto bail;
	}

	off += mr->offset;
	m = 0;
	n = 0;
	while (off >= mr->map[m]->segs[n].length) {
	off -= mr->map[m]->segs[n].length;
	n++;
	if (n >= IPATH_SEGSZ) {
	m++;
	n = 0;
	}
	}
	sge->mr = mr;
	sge->vaddr = mr->map[m]->segs[n].vaddr + off;
	sge->length = mr->map[m]->segs[n].length - off;
	sge->sge_length = len;
	sge->m = m;
	sge->n = n;
	ss->sg_list = NULL;
	ss->num_sge = 1;

	ret = 1;

	bail:
	return ret;
	}