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/*-
* Copyright (C) 2012 Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include "nvme_private.h"
static void
nvme_uio_done(void *arg, const struct nvme_completion *cpl)
{
struct mtx *mtx;
struct uio *uio = arg;
if (!nvme_completion_is_error(cpl))
uio->uio_resid = 0;
mtx = mtx_pool_find(mtxpool_sleep, arg);
mtx_lock(mtx);
wakeup(arg);
mtx_unlock(mtx);
}
void
nvme_payload_map_uio(void *arg, bus_dma_segment_t *seg, int nseg,
bus_size_t mapsize, int error)
{
struct nvme_tracker *tr = arg;
/*
* Now that we know the actual size of the uio, divide it by the
* sector size that we stored in cdw12.
*/
tr->req->cmd.cdw12 = (mapsize / tr->req->cmd.cdw12)-1;
nvme_payload_map(arg, seg, nseg, error);
}
static int
nvme_read_uio(struct nvme_namespace *ns, struct uio *uio)
{
struct nvme_request *req;
struct nvme_command *cmd;
uint64_t lba;
req = nvme_allocate_request_uio(uio, nvme_uio_done, uio);
if (req == NULL)
return (ENOMEM);
cmd = &req->cmd;
cmd->opc = NVME_OPC_READ;
cmd->nsid = ns->id;
lba = uio->uio_offset / nvme_ns_get_sector_size(ns);
*(uint64_t *)&cmd->cdw10 = lba;
/*
* Store the sector size in cdw12 (where the LBA count normally goes).
* We'll adjust cdw12 in the map_uio callback based on the mapsize
* parameter. This allows us to not have to store the namespace
* in the request simply to get the sector size in the map_uio
* callback.
*/
cmd->cdw12 = nvme_ns_get_sector_size(ns);
nvme_ctrlr_submit_io_request(ns->ctrlr, req);
return (0);
}
static int
nvme_write_uio(struct nvme_namespace *ns, struct uio *uio)
{
struct nvme_request *req;
struct nvme_command *cmd;
uint64_t lba;
req = nvme_allocate_request_uio(uio, nvme_uio_done, uio);
if (req == NULL)
return (ENOMEM);
cmd = &req->cmd;
cmd->opc = NVME_OPC_WRITE;
cmd->nsid = ns->id;
lba = uio->uio_offset / nvme_ns_get_sector_size(ns);
*(uint64_t *)&cmd->cdw10 = lba;
/*
* Store the sector size in cdw12 (where the LBA count normally goes).
* We'll adjust cdw12 in the map_uio callback based on the mapsize
* parameter. This allows us to not have to store the namespace
* in the request simply to get the sector size in the map_uio
* callback.
*/
cmd->cdw12 = nvme_ns_get_sector_size(ns);
nvme_ctrlr_submit_io_request(ns->ctrlr, req);
return (0);
}
int
nvme_ns_physio(struct cdev *dev, struct uio *uio, int ioflag)
{
struct uio uio_tmp;
struct iovec uio_iov_tmp;
struct nvme_namespace *ns;
struct mtx *mtx;
int i, nvme_err, physio_err = 0;
#if __FreeBSD_version > 900017
int ref;
#endif
PHOLD(curproc);
ns = dev->si_drv1;
mtx = mtx_pool_find(mtxpool_sleep, &uio_tmp);
#if __FreeBSD_version > 900017
dev_refthread(dev, &ref);
#else
dev_refthread(dev);
#endif
/*
* NVM Express doesn't really support true SGLs. All SG elements
* must be PAGE_SIZE, except for the first and last element.
* Because of this, we need to break up each iovec into a separate
* NVMe command - otherwise we could end up with sub-PAGE_SIZE
* elements in the middle of an SGL which is not allowed.
*/
uio_tmp.uio_iov = &uio_iov_tmp;
uio_tmp.uio_iovcnt = 1;
uio_tmp.uio_offset = uio->uio_offset;
uio_tmp.uio_segflg = uio->uio_segflg;
uio_tmp.uio_rw = uio->uio_rw;
uio_tmp.uio_td = uio->uio_td;
for (i = 0; i < uio->uio_iovcnt; i++) {
uio_iov_tmp.iov_base = uio->uio_iov[i].iov_base;
uio_iov_tmp.iov_len = uio->uio_iov[i].iov_len;
uio_tmp.uio_resid = uio_iov_tmp.iov_len;
mtx_lock(mtx);
if (uio->uio_rw == UIO_READ)
nvme_err = nvme_read_uio(ns, &uio_tmp);
else
nvme_err = nvme_write_uio(ns, &uio_tmp);
if (nvme_err == 0)
msleep(&uio_tmp, mtx, PRIBIO, "nvme_physio", 0);
mtx_unlock(mtx);
if (uio_tmp.uio_resid == 0) {
uio->uio_resid -= uio_iov_tmp.iov_len;
uio->uio_offset += uio_iov_tmp.iov_len;
} else {
physio_err = EFAULT;
break;
}
uio_tmp.uio_offset += uio_iov_tmp.iov_len;
}
#if __FreeBSD_version > 900017
dev_relthread(dev, ref);
#else
dev_relthread(dev);
#endif
PRELE(curproc);
return (physio_err);
}
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