blob: 8519f3212e52b10b3bb883a2950bec9ed64d48bf [file] [log] [blame]
/*
* Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of EITHER the GNU General Public License
* version 2 as published by the Free Software Foundation or the BSD
* 2-Clause License. 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 version 2 for more details at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
*
* You should have received a copy of the GNU General Public License
* along with this program available in the file COPYING in the main
* directory of this source tree.
*
* The BSD 2-Clause 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.
*
* 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 HOLDER 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/list.h>
#include <linux/slab.h>
#include "pvrdma.h"
/**
* pvrdma_get_dma_mr - get a DMA memory region
* @pd: protection domain
* @acc: access flags
*
* @return: ib_mr pointer on success, otherwise returns an errno.
*/
struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc)
{
struct pvrdma_dev *dev = to_vdev(pd->device);
struct pvrdma_user_mr *mr;
union pvrdma_cmd_req req;
union pvrdma_cmd_resp rsp;
struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
int ret;
/* Support only LOCAL_WRITE flag for DMA MRs */
if (acc & ~IB_ACCESS_LOCAL_WRITE) {
dev_warn(&dev->pdev->dev,
"unsupported dma mr access flags %#x\n", acc);
return ERR_PTR(-EOPNOTSUPP);
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
memset(cmd, 0, sizeof(*cmd));
cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
cmd->pd_handle = to_vpd(pd)->pd_handle;
cmd->access_flags = acc;
cmd->flags = PVRDMA_MR_FLAG_DMA;
ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
if (ret < 0) {
dev_warn(&dev->pdev->dev,
"could not get DMA mem region, error: %d\n", ret);
kfree(mr);
return ERR_PTR(ret);
}
mr->mmr.mr_handle = resp->mr_handle;
mr->ibmr.lkey = resp->lkey;
mr->ibmr.rkey = resp->rkey;
return &mr->ibmr;
}
/**
* pvrdma_reg_user_mr - register a userspace memory region
* @pd: protection domain
* @start: starting address
* @length: length of region
* @virt_addr: I/O virtual address
* @access_flags: access flags for memory region
* @udata: user data
*
* @return: ib_mr pointer on success, otherwise returns an errno.
*/
struct ib_mr *pvrdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt_addr, int access_flags,
struct ib_udata *udata)
{
struct pvrdma_dev *dev = to_vdev(pd->device);
struct pvrdma_user_mr *mr = NULL;
struct ib_umem *umem;
union pvrdma_cmd_req req;
union pvrdma_cmd_resp rsp;
struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
int nchunks;
int ret;
int entry;
struct scatterlist *sg;
if (length == 0 || length > dev->dsr->caps.max_mr_size) {
dev_warn(&dev->pdev->dev, "invalid mem region length\n");
return ERR_PTR(-EINVAL);
}
umem = ib_umem_get(pd->uobject->context, start,
length, access_flags, 0);
if (IS_ERR(umem)) {
dev_warn(&dev->pdev->dev,
"could not get umem for mem region\n");
return ERR_CAST(umem);
}
nchunks = 0;
for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry)
nchunks += sg_dma_len(sg) >> PAGE_SHIFT;
if (nchunks < 0 || nchunks > PVRDMA_PAGE_DIR_MAX_PAGES) {
dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
nchunks);
ret = -EINVAL;
goto err_umem;
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr) {
ret = -ENOMEM;
goto err_umem;
}
mr->mmr.iova = virt_addr;
mr->mmr.size = length;
mr->umem = umem;
ret = pvrdma_page_dir_init(dev, &mr->pdir, nchunks, false);
if (ret) {
dev_warn(&dev->pdev->dev,
"could not allocate page directory\n");
goto err_umem;
}
ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0);
if (ret)
goto err_pdir;
memset(cmd, 0, sizeof(*cmd));
cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
cmd->start = start;
cmd->length = length;
cmd->pd_handle = to_vpd(pd)->pd_handle;
cmd->access_flags = access_flags;
cmd->nchunks = nchunks;
cmd->pdir_dma = mr->pdir.dir_dma;
ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
if (ret < 0) {
dev_warn(&dev->pdev->dev,
"could not register mem region, error: %d\n", ret);
goto err_pdir;
}
mr->mmr.mr_handle = resp->mr_handle;
mr->ibmr.lkey = resp->lkey;
mr->ibmr.rkey = resp->rkey;
return &mr->ibmr;
err_pdir:
pvrdma_page_dir_cleanup(dev, &mr->pdir);
err_umem:
ib_umem_release(umem);
kfree(mr);
return ERR_PTR(ret);
}
/**
* pvrdma_alloc_mr - allocate a memory region
* @pd: protection domain
* @mr_type: type of memory region
* @max_num_sg: maximum number of pages
*
* @return: ib_mr pointer on success, otherwise returns an errno.
*/
struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
u32 max_num_sg)
{
struct pvrdma_dev *dev = to_vdev(pd->device);
struct pvrdma_user_mr *mr;
union pvrdma_cmd_req req;
union pvrdma_cmd_resp rsp;
struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
int size = max_num_sg * sizeof(u64);
int ret;
if (mr_type != IB_MR_TYPE_MEM_REG ||
max_num_sg > PVRDMA_MAX_FAST_REG_PAGES)
return ERR_PTR(-EINVAL);
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr)
return ERR_PTR(-ENOMEM);
mr->pages = kzalloc(size, GFP_KERNEL);
if (!mr->pages) {
ret = -ENOMEM;
goto freemr;
}
ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false);
if (ret) {
dev_warn(&dev->pdev->dev,
"failed to allocate page dir for mr\n");
ret = -ENOMEM;
goto freepages;
}
memset(cmd, 0, sizeof(*cmd));
cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
cmd->pd_handle = to_vpd(pd)->pd_handle;
cmd->access_flags = 0;
cmd->flags = PVRDMA_MR_FLAG_FRMR;
cmd->nchunks = max_num_sg;
ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
if (ret < 0) {
dev_warn(&dev->pdev->dev,
"could not create FR mem region, error: %d\n", ret);
goto freepdir;
}
mr->max_pages = max_num_sg;
mr->mmr.mr_handle = resp->mr_handle;
mr->ibmr.lkey = resp->lkey;
mr->ibmr.rkey = resp->rkey;
mr->page_shift = PAGE_SHIFT;
mr->umem = NULL;
return &mr->ibmr;
freepdir:
pvrdma_page_dir_cleanup(dev, &mr->pdir);
freepages:
kfree(mr->pages);
freemr:
kfree(mr);
return ERR_PTR(ret);
}
/**
* pvrdma_dereg_mr - deregister a memory region
* @ibmr: memory region
*
* @return: 0 on success.
*/
int pvrdma_dereg_mr(struct ib_mr *ibmr)
{
struct pvrdma_user_mr *mr = to_vmr(ibmr);
struct pvrdma_dev *dev = to_vdev(ibmr->device);
union pvrdma_cmd_req req;
struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
int ret;
memset(cmd, 0, sizeof(*cmd));
cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
cmd->mr_handle = mr->mmr.mr_handle;
ret = pvrdma_cmd_post(dev, &req, NULL, 0);
if (ret < 0)
dev_warn(&dev->pdev->dev,
"could not deregister mem region, error: %d\n", ret);
pvrdma_page_dir_cleanup(dev, &mr->pdir);
if (mr->umem)
ib_umem_release(mr->umem);
kfree(mr->pages);
kfree(mr);
return 0;
}
static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr)
{
struct pvrdma_user_mr *mr = to_vmr(ibmr);
if (mr->npages == mr->max_pages)
return -ENOMEM;
mr->pages[mr->npages++] = addr;
return 0;
}
int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
unsigned int *sg_offset)
{
struct pvrdma_user_mr *mr = to_vmr(ibmr);
struct pvrdma_dev *dev = to_vdev(ibmr->device);
int ret;
mr->npages = 0;
ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page);
if (ret < 0)
dev_warn(&dev->pdev->dev, "could not map sg to pages\n");
return ret;
}