[people/arne_f/kernel.git] / drivers / infiniband / sw / rxe / rxe_mr.c

/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, 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 "rxe.h"
#include "rxe_loc.h"

/*
 * lfsr (linear feedback shift register) with period 255
 */
static u8 rxe_get_key(void)
{
	static u32 key = 1;

	key = key << 1;

	key |= (0 != (key & 0x100)) ^ (0 != (key & 0x10))
		^ (0 != (key & 0x80)) ^ (0 != (key & 0x40));

	key &= 0xff;

	return key;
}

int mem_check_range(struct rxe_mem *mem, u64 iova, size_t length)
{
	switch (mem->type) {
	case RXE_MEM_TYPE_DMA:
		return 0;

	case RXE_MEM_TYPE_MR:
	case RXE_MEM_TYPE_FMR:
		if (iova < mem->iova ||
		    length > mem->length ||
		    iova > mem->iova + mem->length - length)
			return -EFAULT;
		return 0;

	default:
		return -EFAULT;
	}
}

#define IB_ACCESS_REMOTE	(IB_ACCESS_REMOTE_READ		\
				| IB_ACCESS_REMOTE_WRITE	\
				| IB_ACCESS_REMOTE_ATOMIC)

static void rxe_mem_init(int access, struct rxe_mem *mem)
{
	u32 lkey = mem->pelem.index << 8 | rxe_get_key();
	u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;

	if (mem->pelem.pool->type == RXE_TYPE_MR) {
		mem->ibmr.lkey		= lkey;
		mem->ibmr.rkey		= rkey;
	}

	mem->lkey		= lkey;
	mem->rkey		= rkey;
	mem->state		= RXE_MEM_STATE_INVALID;
	mem->type		= RXE_MEM_TYPE_NONE;
	mem->map_shift		= ilog2(RXE_BUF_PER_MAP);
}

void rxe_mem_cleanup(struct rxe_pool_entry *arg)
{
	struct rxe_mem *mem = container_of(arg, typeof(*mem), pelem);
	int i;

	if (mem->umem)
		ib_umem_release(mem->umem);

	if (mem->map) {
		for (i = 0; i < mem->num_map; i++)
			kfree(mem->map[i]);

		kfree(mem->map);
	}
}

static int rxe_mem_alloc(struct rxe_dev *rxe, struct rxe_mem *mem, int num_buf)
{
	int i;
	int num_map;
	struct rxe_map **map = mem->map;

	num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;

	mem->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
	if (!mem->map)
		goto err1;

	for (i = 0; i < num_map; i++) {
		mem->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
		if (!mem->map[i])
			goto err2;
	}

	BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));

	mem->map_shift	= ilog2(RXE_BUF_PER_MAP);
	mem->map_mask	= RXE_BUF_PER_MAP - 1;

	mem->num_buf = num_buf;
	mem->num_map = num_map;
	mem->max_buf = num_map * RXE_BUF_PER_MAP;

	return 0;

err2:
	for (i--; i >= 0; i--)
		kfree(mem->map[i]);

	kfree(mem->map);
err1:
	return -ENOMEM;
}

int rxe_mem_init_dma(struct rxe_dev *rxe, struct rxe_pd *pd,
		     int access, struct rxe_mem *mem)
{
	rxe_mem_init(access, mem);

	mem->pd			= pd;
	mem->access		= access;
	mem->state		= RXE_MEM_STATE_VALID;
	mem->type		= RXE_MEM_TYPE_DMA;

	return 0;
}

int rxe_mem_init_user(struct rxe_dev *rxe, struct rxe_pd *pd, u64 start,
		      u64 length, u64 iova, int access, struct ib_udata *udata,
		      struct rxe_mem *mem)
{
	int			entry;
	struct rxe_map		**map;
	struct rxe_phys_buf	*buf = NULL;
	struct ib_umem		*umem;
	struct scatterlist	*sg;
	int			num_buf;
	void			*vaddr;
	int err;

	umem = ib_umem_get(pd->ibpd.uobject->context, start, length, access, 0);
	if (IS_ERR(umem)) {
		pr_warn("err %d from rxe_umem_get\n",
			(int)PTR_ERR(umem));
		err = -EINVAL;
		goto err1;
	}

	mem->umem = umem;
	num_buf = umem->nmap;

	rxe_mem_init(access, mem);

	err = rxe_mem_alloc(rxe, mem, num_buf);
	if (err) {
		pr_warn("err %d from rxe_mem_alloc\n", err);
		ib_umem_release(umem);
		goto err1;
	}

	mem->page_shift		= umem->page_shift;
	mem->page_mask		= BIT(umem->page_shift) - 1;

	num_buf			= 0;
	map			= mem->map;
	if (length > 0) {
		buf = map[0]->buf;

		for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
			vaddr = page_address(sg_page(sg));
			if (!vaddr) {
				pr_warn("null vaddr\n");
				err = -ENOMEM;
				goto err1;
			}

			buf->addr = (uintptr_t)vaddr;
			buf->size = BIT(umem->page_shift);
			num_buf++;
			buf++;

			if (num_buf >= RXE_BUF_PER_MAP) {
				map++;
				buf = map[0]->buf;
				num_buf = 0;
			}
		}
	}

	mem->pd			= pd;
	mem->umem		= umem;
	mem->access		= access;
	mem->length		= length;
	mem->iova		= iova;
	mem->va			= start;
	mem->offset		= ib_umem_offset(umem);
	mem->state		= RXE_MEM_STATE_VALID;
	mem->type		= RXE_MEM_TYPE_MR;

	return 0;

err1:
	return err;
}

int rxe_mem_init_fast(struct rxe_dev *rxe, struct rxe_pd *pd,
		      int max_pages, struct rxe_mem *mem)
{
	int err;

	rxe_mem_init(0, mem);

	/* In fastreg, we also set the rkey */
	mem->ibmr.rkey = mem->ibmr.lkey;

	err = rxe_mem_alloc(rxe, mem, max_pages);
	if (err)
		goto err1;

	mem->pd			= pd;
	mem->max_buf		= max_pages;
	mem->state		= RXE_MEM_STATE_FREE;
	mem->type		= RXE_MEM_TYPE_MR;

	return 0;

err1:
	return err;
}

static void lookup_iova(
	struct rxe_mem	*mem,
	u64			iova,
	int			*m_out,
	int			*n_out,
	size_t			*offset_out)
{
	size_t			offset = iova - mem->iova + mem->offset;
	int			map_index;
	int			buf_index;
	u64			length;

	if (likely(mem->page_shift)) {
		*offset_out = offset & mem->page_mask;
		offset >>= mem->page_shift;
		*n_out = offset & mem->map_mask;
		*m_out = offset >> mem->map_shift;
	} else {
		map_index = 0;
		buf_index = 0;

		length = mem->map[map_index]->buf[buf_index].size;

		while (offset >= length) {
			offset -= length;
			buf_index++;

			if (buf_index == RXE_BUF_PER_MAP) {
				map_index++;
				buf_index = 0;
			}
			length = mem->map[map_index]->buf[buf_index].size;
		}

		*m_out = map_index;
		*n_out = buf_index;
		*offset_out = offset;
	}
}

void *iova_to_vaddr(struct rxe_mem *mem, u64 iova, int length)
{
	size_t offset;
	int m, n;
	void *addr;

	if (mem->state != RXE_MEM_STATE_VALID) {
		pr_warn("mem not in valid state\n");
		addr = NULL;
		goto out;
	}

	if (!mem->map) {
		addr = (void *)(uintptr_t)iova;
		goto out;
	}

	if (mem_check_range(mem, iova, length)) {
		pr_warn("range violation\n");
		addr = NULL;
		goto out;
	}

	lookup_iova(mem, iova, &m, &n, &offset);

	if (offset + length > mem->map[m]->buf[n].size) {
		pr_warn("crosses page boundary\n");
		addr = NULL;
		goto out;
	}

	addr = (void *)(uintptr_t)mem->map[m]->buf[n].addr + offset;

out:
	return addr;
}

/* copy data from a range (vaddr, vaddr+length-1) to or from
 * a mem object starting at iova. Compute incremental value of
 * crc32 if crcp is not zero. caller must hold a reference to mem
 */
int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
		 enum copy_direction dir, u32 *crcp)
{
	int			err;
	int			bytes;
	u8			*va;
	struct rxe_map		**map;
	struct rxe_phys_buf	*buf;
	int			m;
	int			i;
	size_t			offset;
	u32			crc = crcp ? (*crcp) : 0;

	if (length == 0)
		return 0;

	if (mem->type == RXE_MEM_TYPE_DMA) {
		u8 *src, *dest;

		src  = (dir == to_mem_obj) ?
			addr : ((void *)(uintptr_t)iova);

		dest = (dir == to_mem_obj) ?
			((void *)(uintptr_t)iova) : addr;

		memcpy(dest, src, length);

		if (crcp)
			*crcp = rxe_crc32(to_rdev(mem->pd->ibpd.device),
					*crcp, dest, length);

		return 0;
	}

	WARN_ON_ONCE(!mem->map);

	err = mem_check_range(mem, iova, length);
	if (err) {
		err = -EFAULT;
		goto err1;
	}

	lookup_iova(mem, iova, &m, &i, &offset);

	map	= mem->map + m;
	buf	= map[0]->buf + i;

	while (length > 0) {
		u8 *src, *dest;

		va	= (u8 *)(uintptr_t)buf->addr + offset;
		src  = (dir == to_mem_obj) ? addr : va;
		dest = (dir == to_mem_obj) ? va : addr;

		bytes	= buf->size - offset;

		if (bytes > length)
			bytes = length;

		memcpy(dest, src, bytes);

		if (crcp)
			crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
					crc, dest, bytes);

		length	-= bytes;
		addr	+= bytes;

		offset	= 0;
		buf++;
		i++;

		if (i == RXE_BUF_PER_MAP) {
			i = 0;
			map++;
			buf = map[0]->buf;
		}
	}

	if (crcp)
		*crcp = crc;

	return 0;

err1:
	return err;
}

/* copy data in or out of a wqe, i.e. sg list
 * under the control of a dma descriptor
 */
int copy_data(
	struct rxe_dev		*rxe,
	struct rxe_pd		*pd,
	int			access,
	struct rxe_dma_info	*dma,
	void			*addr,
	int			length,
	enum copy_direction	dir,
	u32			*crcp)
{
	int			bytes;
	struct rxe_sge		*sge	= &dma->sge[dma->cur_sge];
	int			offset	= dma->sge_offset;
	int			resid	= dma->resid;
	struct rxe_mem		*mem	= NULL;
	u64			iova;
	int			err;

	if (length == 0)
		return 0;

	if (length > resid) {
		err = -EINVAL;
		goto err2;
	}

	if (sge->length && (offset < sge->length)) {
		mem = lookup_mem(pd, access, sge->lkey, lookup_local);
		if (!mem) {
			err = -EINVAL;
			goto err1;
		}
	}

	while (length > 0) {
		bytes = length;

		if (offset >= sge->length) {
			if (mem) {
				rxe_drop_ref(mem);
				mem = NULL;
			}
			sge++;
			dma->cur_sge++;
			offset = 0;

			if (dma->cur_sge >= dma->num_sge) {
				err = -ENOSPC;
				goto err2;
			}

			if (sge->length) {
				mem = lookup_mem(pd, access, sge->lkey,
						 lookup_local);
				if (!mem) {
					err = -EINVAL;
					goto err1;
				}
			} else {
				continue;
			}
		}

		if (bytes > sge->length - offset)
			bytes = sge->length - offset;

		if (bytes > 0) {
			iova = sge->addr + offset;

			err = rxe_mem_copy(mem, iova, addr, bytes, dir, crcp);
			if (err)
				goto err2;

			offset	+= bytes;
			resid	-= bytes;
			length	-= bytes;
			addr	+= bytes;
		}
	}

	dma->sge_offset = offset;
	dma->resid	= resid;

	if (mem)
		rxe_drop_ref(mem);

	return 0;

err2:
	if (mem)
		rxe_drop_ref(mem);
err1:
	return err;
}

int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
{
	struct rxe_sge		*sge	= &dma->sge[dma->cur_sge];
	int			offset	= dma->sge_offset;
	int			resid	= dma->resid;

	while (length) {
		unsigned int bytes;

		if (offset >= sge->length) {
			sge++;
			dma->cur_sge++;
			offset = 0;
			if (dma->cur_sge >= dma->num_sge)
				return -ENOSPC;
		}

		bytes = length;

		if (bytes > sge->length - offset)
			bytes = sge->length - offset;

		offset	+= bytes;
		resid	-= bytes;
		length	-= bytes;
	}

	dma->sge_offset = offset;
	dma->resid	= resid;

	return 0;
}

/* (1) find the mem (mr or mw) corresponding to lkey/rkey
 *     depending on lookup_type
 * (2) verify that the (qp) pd matches the mem pd
 * (3) verify that the mem can support the requested access
 * (4) verify that mem state is valid
 */
struct rxe_mem *lookup_mem(struct rxe_pd *pd, int access, u32 key,
			   enum lookup_type type)
{
	struct rxe_mem *mem;
	struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
	int index = key >> 8;

	if (index >= RXE_MIN_MR_INDEX && index <= RXE_MAX_MR_INDEX) {
		mem = rxe_pool_get_index(&rxe->mr_pool, index);
		if (!mem)
			goto err1;
	} else {
		goto err1;
	}

	if ((type == lookup_local && mem->lkey != key) ||
	    (type == lookup_remote && mem->rkey != key))
		goto err2;

	if (mem->pd != pd)
		goto err2;

	if (access && !(access & mem->access))
		goto err2;

	if (mem->state != RXE_MEM_STATE_VALID)
		goto err2;

	return mem;

err2:
	rxe_drop_ref(mem);
err1:
	return NULL;
}

int rxe_mem_map_pages(struct rxe_dev *rxe, struct rxe_mem *mem,
		      u64 *page, int num_pages, u64 iova)
{
	int i;
	int num_buf;
	int err;
	struct rxe_map **map;
	struct rxe_phys_buf *buf;
	int page_size;

	if (num_pages > mem->max_buf) {
		err = -EINVAL;
		goto err1;
	}

	num_buf		= 0;
	page_size	= 1 << mem->page_shift;
	map		= mem->map;
	buf		= map[0]->buf;

	for (i = 0; i < num_pages; i++) {
		buf->addr = *page++;
		buf->size = page_size;
		buf++;
		num_buf++;

		if (num_buf == RXE_BUF_PER_MAP) {
			map++;
			buf = map[0]->buf;
			num_buf = 0;
		}
	}

	mem->iova	= iova;
	mem->va		= iova;
	mem->length	= num_pages << mem->page_shift;
	mem->state	= RXE_MEM_STATE_VALID;

	return 0;

err1:
	return err;
}
Commit	Line	Data
8700e3e7 MS	1	/*
	2	* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
	3	* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
	34	#include "rxe.h"
	35	#include "rxe_loc.h"
	36
	37	/*
	38	* lfsr (linear feedback shift register) with period 255
	39	*/
	40	static u8 rxe_get_key(void)
	41	{
e404f945	42	static u32 key = 1;
8700e3e7 MS	43
	44	key = key << 1;
	45
	46	key \|= (0 != (key & 0x100)) ^ (0 != (key & 0x10))
	47	^ (0 != (key & 0x80)) ^ (0 != (key & 0x40));
	48
	49	key &= 0xff;
	50
	51	return key;
	52	}
	53
	54	int mem_check_range(struct rxe_mem *mem, u64 iova, size_t length)
	55	{
	56	switch (mem->type) {
	57	case RXE_MEM_TYPE_DMA:
	58	return 0;
	59
	60	case RXE_MEM_TYPE_MR:
	61	case RXE_MEM_TYPE_FMR:
647bf3d8 EI	62	if (iova < mem->iova \|\|
	63	length > mem->length \|\|
	64	iova > mem->iova + mem->length - length)
	65	return -EFAULT;
	66	return 0;
8700e3e7 MS	67
	68	default:
	69	return -EFAULT;
	70	}
	71	}
	72
	73	#define IB_ACCESS_REMOTE (IB_ACCESS_REMOTE_READ \
	74	\| IB_ACCESS_REMOTE_WRITE \
	75	\| IB_ACCESS_REMOTE_ATOMIC)
	76
	77	static void rxe_mem_init(int access, struct rxe_mem *mem)
	78	{
	79	u32 lkey = mem->pelem.index << 8 \| rxe_get_key();
	80	u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;
	81
	82	if (mem->pelem.pool->type == RXE_TYPE_MR) {
	83	mem->ibmr.lkey = lkey;
	84	mem->ibmr.rkey = rkey;
	85	}
	86
	87	mem->lkey = lkey;
	88	mem->rkey = rkey;
	89	mem->state = RXE_MEM_STATE_INVALID;
	90	mem->type = RXE_MEM_TYPE_NONE;
	91	mem->map_shift = ilog2(RXE_BUF_PER_MAP);
	92	}
	93
32404fb7	94	void rxe_mem_cleanup(struct rxe_pool_entry *arg)
8700e3e7	95	{
32404fb7	96	struct rxe_mem mem = container_of(arg, typeof(mem), pelem);
8700e3e7 MS	97	int i;
	98
	99	if (mem->umem)
	100	ib_umem_release(mem->umem);
	101
	102	if (mem->map) {
	103	for (i = 0; i < mem->num_map; i++)
	104	kfree(mem->map[i]);
	105
	106	kfree(mem->map);
	107	}
	108	}
	109
	110	static int rxe_mem_alloc(struct rxe_dev rxe, struct rxe_mem mem, int num_buf)
	111	{
	112	int i;
	113	int num_map;
	114	struct rxe_map **map = mem->map;
	115
	116	num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;
	117
	118	mem->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
	119	if (!mem->map)
	120	goto err1;
	121
	122	for (i = 0; i < num_map; i++) {
	123	mem->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
	124	if (!mem->map[i])
	125	goto err2;
	126	}
	127
43553b47	128	BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));
8700e3e7 MS	129
	130	mem->map_shift = ilog2(RXE_BUF_PER_MAP);
	131	mem->map_mask = RXE_BUF_PER_MAP - 1;
	132
	133	mem->num_buf = num_buf;
	134	mem->num_map = num_map;
	135	mem->max_buf = num_map * RXE_BUF_PER_MAP;
	136
	137	return 0;
	138
	139	err2:
	140	for (i--; i >= 0; i--)
	141	kfree(mem->map[i]);
	142
	143	kfree(mem->map);
	144	err1:
	145	return -ENOMEM;
	146	}
	147
	148	int rxe_mem_init_dma(struct rxe_dev rxe, struct rxe_pd pd,
	149	int access, struct rxe_mem *mem)
	150	{
	151	rxe_mem_init(access, mem);
	152
	153	mem->pd = pd;
	154	mem->access = access;
	155	mem->state = RXE_MEM_STATE_VALID;
	156	mem->type = RXE_MEM_TYPE_DMA;
	157
	158	return 0;
	159	}
	160
	161	int rxe_mem_init_user(struct rxe_dev rxe, struct rxe_pd pd, u64 start,
	162	u64 length, u64 iova, int access, struct ib_udata *udata,
	163	struct rxe_mem *mem)
	164	{
	165	int entry;
	166	struct rxe_map **map;
	167	struct rxe_phys_buf *buf = NULL;
	168	struct ib_umem *umem;
	169	struct scatterlist *sg;
	170	int num_buf;
	171	void *vaddr;
	172	int err;
	173
	174	umem = ib_umem_get(pd->ibpd.uobject->context, start, length, access, 0);
	175	if (IS_ERR(umem)) {
	176	pr_warn("err %d from rxe_umem_get\n",
	177	(int)PTR_ERR(umem));
	178	err = -EINVAL;
	179	goto err1;
	180	}
	181
	182	mem->umem = umem;
	183	num_buf = umem->nmap;
	184
	185	rxe_mem_init(access, mem);
	186
	187	err = rxe_mem_alloc(rxe, mem, num_buf);
	188	if (err) {
	189	pr_warn("err %d from rxe_mem_alloc\n", err);
	190	ib_umem_release(umem);
	191	goto err1;
	192	}
193
3e7e1193 AK	194	mem->page_shift = umem->page_shift;
3e7e1193 AK	195	mem->page_mask = BIT(umem->page_shift) - 1;
8700e3e7 MS	196
	197	num_buf = 0;
	198	map = mem->map;
	199	if (length > 0) {
	200	buf = map[0]->buf;
	201
	202	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
	203	vaddr = page_address(sg_page(sg));
	204	if (!vaddr) {
	205	pr_warn("null vaddr\n");
	206	err = -ENOMEM;
	207	goto err1;
	208	}
	209
	210	buf->addr = (uintptr_t)vaddr;
3e7e1193	211	buf->size = BIT(umem->page_shift);
8700e3e7 MS	212	num_buf++;
	213	buf++;
	214
	215	if (num_buf >= RXE_BUF_PER_MAP) {
	216	map++;
	217	buf = map[0]->buf;
	218	num_buf = 0;
	219	}
	220	}
	221	}
	222
	223	mem->pd = pd;
	224	mem->umem = umem;
	225	mem->access = access;
	226	mem->length = length;
	227	mem->iova = iova;
	228	mem->va = start;
	229	mem->offset = ib_umem_offset(umem);
	230	mem->state = RXE_MEM_STATE_VALID;
	231	mem->type = RXE_MEM_TYPE_MR;
	232
	233	return 0;
	234
	235	err1:
	236	return err;
	237	}
	238
	239	int rxe_mem_init_fast(struct rxe_dev rxe, struct rxe_pd pd,
	240	int max_pages, struct rxe_mem *mem)
	241	{
	242	int err;
	243
	244	rxe_mem_init(0, mem);
	245
	246	/* In fastreg, we also set the rkey */
	247	mem->ibmr.rkey = mem->ibmr.lkey;
	248
	249	err = rxe_mem_alloc(rxe, mem, max_pages);
	250	if (err)
	251	goto err1;
	252
	253	mem->pd = pd;
	254	mem->max_buf = max_pages;
	255	mem->state = RXE_MEM_STATE_FREE;
	256	mem->type = RXE_MEM_TYPE_MR;
	257
	258	return 0;
	259
	260	err1:
	261	return err;
	262	}
	263
	264	static void lookup_iova(
	265	struct rxe_mem *mem,
	266	u64 iova,
	267	int *m_out,
	268	int *n_out,
	269	size_t *offset_out)
	270	{
	271	size_t offset = iova - mem->iova + mem->offset;
	272	int map_index;
	273	int buf_index;
	274	u64 length;
	275
276	if (likely(mem->page_shift)) {
277	*offset_out = offset & mem->page_mask;
278	offset >>= mem->page_shift;
279	*n_out = offset & mem->map_mask;
280	*m_out = offset >> mem->map_shift;
281	} else {
282	map_index = 0;
283	buf_index = 0;
284
285	length = mem->map[map_index]->buf[buf_index].size;
286
287	while (offset >= length) {
288	offset -= length;
289	buf_index++;
290
291	if (buf_index == RXE_BUF_PER_MAP) {
292	map_index++;
293	buf_index = 0;
294	}
295	length = mem->map[map_index]->buf[buf_index].size;
296	}
297
298	*m_out = map_index;
299	*n_out = buf_index;
300	*offset_out = offset;
301	}
302	}
303
304	void iova_to_vaddr(struct rxe_mem mem, u64 iova, int length)
305	{
306	size_t offset;
307	int m, n;
308	void *addr;
309
310	if (mem->state != RXE_MEM_STATE_VALID) {
311	pr_warn("mem not in valid state\n");
312	addr = NULL;
313	goto out;
314	}
315
316	if (!mem->map) {
317	addr = (void *)(uintptr_t)iova;
318	goto out;
319	}
320
321	if (mem_check_range(mem, iova, length)) {
322	pr_warn("range violation\n");
323	addr = NULL;
324	goto out;
325	}
326
327	lookup_iova(mem, iova, &m, &n, &offset);
328
329	if (offset + length > mem->map[m]->buf[n].size) {
330	pr_warn("crosses page boundary\n");
331	addr = NULL;
332	goto out;
333	}
334
335	addr = (void *)(uintptr_t)mem->map[m]->buf[n].addr + offset;
336
337	out:
338	return addr;
339	}
340
341	/* copy data from a range (vaddr, vaddr+length-1) to or from
342	* a mem object starting at iova. Compute incremental value of
343	* crc32 if crcp is not zero. caller must hold a reference to mem
344	*/
345	int rxe_mem_copy(struct rxe_mem mem, u64 iova, void addr, int length,
346	enum copy_direction dir, u32 *crcp)
347	{
348	int err;
349	int bytes;
350	u8 *va;
351	struct rxe_map **map;
352	struct rxe_phys_buf *buf;
353	int m;
354	int i;
355	size_t offset;
356	u32 crc = crcp ? (*crcp) : 0;
357
d4fb5925 AB	358	if (length == 0)
	359	return 0;
	360
8700e3e7 MS	361	if (mem->type == RXE_MEM_TYPE_DMA) {
	362	u8 src, dest;
	363
	364	src = (dir == to_mem_obj) ?
	365	addr : ((void *)(uintptr_t)iova);
	366
	367	dest = (dir == to_mem_obj) ?
	368	((void *)(uintptr_t)iova) : addr;
	369
13eb1e21 AB	370	memcpy(dest, src, length);
13eb1e21 AB	371
8700e3e7	372	if (crcp)
af5df5fb	373	*crcp = rxe_crc32(to_rdev(mem->pd->ibpd.device),
13eb1e21	374	*crcp, dest, length);
8700e3e7 MS	375
	376	return 0;
	377	}
	378
43553b47	379	WARN_ON_ONCE(!mem->map);
8700e3e7 MS	380
	381	err = mem_check_range(mem, iova, length);
	382	if (err) {
	383	err = -EFAULT;
	384	goto err1;
	385	}
	386
	387	lookup_iova(mem, iova, &m, &i, &offset);
	388
	389	map = mem->map + m;
	390	buf = map[0]->buf + i;
	391
	392	while (length > 0) {
	393	u8 src, dest;
	394
	395	va = (u8 *)(uintptr_t)buf->addr + offset;
	396	src = (dir == to_mem_obj) ? addr : va;
	397	dest = (dir == to_mem_obj) ? va : addr;
	398
	399	bytes = buf->size - offset;
	400
	401	if (bytes > length)
	402	bytes = length;
	403
13eb1e21 AB	404	memcpy(dest, src, bytes);
13eb1e21 AB	405
8700e3e7	406	if (crcp)
cee2688e	407	crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
13eb1e21	408	crc, dest, bytes);
8700e3e7 MS	409
	410	length -= bytes;
	411	addr += bytes;
	412
	413	offset = 0;
	414	buf++;
	415	i++;
	416
	417	if (i == RXE_BUF_PER_MAP) {
	418	i = 0;
	419	map++;
	420	buf = map[0]->buf;
	421	}
	422	}
	423
	424	if (crcp)
	425	*crcp = crc;
	426
	427	return 0;
	428
	429	err1:
	430	return err;
	431	}
	432
	433	/* copy data in or out of a wqe, i.e. sg list
	434	* under the control of a dma descriptor
	435	*/
	436	int copy_data(
	437	struct rxe_dev *rxe,
	438	struct rxe_pd *pd,
	439	int access,
	440	struct rxe_dma_info *dma,
	441	void *addr,
	442	int length,
	443	enum copy_direction dir,
	444	u32 *crcp)
	445	{
	446	int bytes;
	447	struct rxe_sge *sge = &dma->sge[dma->cur_sge];
	448	int offset = dma->sge_offset;
	449	int resid = dma->resid;
	450	struct rxe_mem *mem = NULL;
	451	u64 iova;
	452	int err;
	453
	454	if (length == 0)
	455	return 0;
	456
	457	if (length > resid) {
	458	err = -EINVAL;
	459	goto err2;
	460	}
	461
	462	if (sge->length && (offset < sge->length)) {
	463	mem = lookup_mem(pd, access, sge->lkey, lookup_local);
	464	if (!mem) {
	465	err = -EINVAL;
	466	goto err1;
	467	}
	468	}
	469
	470	while (length > 0) {
	471	bytes = length;
	472
473	if (offset >= sge->length) {
474	if (mem) {
475	rxe_drop_ref(mem);
476	mem = NULL;
477	}
478	sge++;
479	dma->cur_sge++;
480	offset = 0;
481
482	if (dma->cur_sge >= dma->num_sge) {
483	err = -ENOSPC;
484	goto err2;
485	}
486
487	if (sge->length) {
488	mem = lookup_mem(pd, access, sge->lkey,
489	lookup_local);
490	if (!mem) {
491	err = -EINVAL;
492	goto err1;
493	}
494	} else {
495	continue;
496	}
497	}
498
499	if (bytes > sge->length - offset)
500	bytes = sge->length - offset;
501
502	if (bytes > 0) {
503	iova = sge->addr + offset;
504
505	err = rxe_mem_copy(mem, iova, addr, bytes, dir, crcp);
506	if (err)
507	goto err2;
508
509	offset += bytes;
510	resid -= bytes;
511	length -= bytes;
512	addr += bytes;
513	}
514	}
515
516	dma->sge_offset = offset;
517	dma->resid = resid;
518
519	if (mem)
520	rxe_drop_ref(mem);
521
522	return 0;
523
524	err2:
525	if (mem)
526	rxe_drop_ref(mem);
527	err1:
528	return err;
529	}
530
531	int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
532	{
533	struct rxe_sge *sge = &dma->sge[dma->cur_sge];
534	int offset = dma->sge_offset;
535	int resid = dma->resid;
536
537	while (length) {
538	unsigned int bytes;
539
540	if (offset >= sge->length) {
541	sge++;
542	dma->cur_sge++;
543	offset = 0;
544	if (dma->cur_sge >= dma->num_sge)
545	return -ENOSPC;
546	}
547
548	bytes = length;
549
550	if (bytes > sge->length - offset)
551	bytes = sge->length - offset;
552
553	offset += bytes;
554	resid -= bytes;
555	length -= bytes;
556	}
557
558	dma->sge_offset = offset;
559	dma->resid = resid;
560
561	return 0;
562	}
563
564	/* (1) find the mem (mr or mw) corresponding to lkey/rkey
565	* depending on lookup_type
566	* (2) verify that the (qp) pd matches the mem pd
567	* (3) verify that the mem can support the requested access
568	* (4) verify that mem state is valid
569	*/
570	struct rxe_mem lookup_mem(struct rxe_pd pd, int access, u32 key,
571	enum lookup_type type)
572	{
573	struct rxe_mem *mem;
574	struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
575	int index = key >> 8;
576
577	if (index >= RXE_MIN_MR_INDEX && index <= RXE_MAX_MR_INDEX) {
578	mem = rxe_pool_get_index(&rxe->mr_pool, index);
579	if (!mem)
580	goto err1;
581	} else {
582	goto err1;
583	}
584
585	if ((type == lookup_local && mem->lkey != key) \|\|
586	(type == lookup_remote && mem->rkey != key))
587	goto err2;
588
589	if (mem->pd != pd)
590	goto err2;
591
592	if (access && !(access & mem->access))
593	goto err2;
594
595	if (mem->state != RXE_MEM_STATE_VALID)
596	goto err2;
597
598	return mem;
599
600	err2:
601	rxe_drop_ref(mem);
602	err1:
603	return NULL;
604	}
605
606	int rxe_mem_map_pages(struct rxe_dev rxe, struct rxe_mem mem,
607	u64 *page, int num_pages, u64 iova)
608	{
609	int i;
610	int num_buf;
611	int err;
612	struct rxe_map **map;
613	struct rxe_phys_buf *buf;
614	int page_size;
615
616	if (num_pages > mem->max_buf) {
617	err = -EINVAL;
618	goto err1;
619	}
620
621	num_buf = 0;
622	page_size = 1 << mem->page_shift;
623	map = mem->map;
624	buf = map[0]->buf;
625
626	for (i = 0; i < num_pages; i++) {
627	buf->addr = *page++;
628	buf->size = page_size;
629	buf++;
630	num_buf++;
631
632	if (num_buf == RXE_BUF_PER_MAP) {
633	map++;
634	buf = map[0]->buf;
635	num_buf = 0;
636	}
637	}
638
639	mem->iova = iova;
640	mem->va = iova;
641	mem->length = num_pages << mem->page_shift;
642	mem->state = RXE_MEM_STATE_VALID;
643
644	return 0;
645
646	err1:
647	return err;
648	}