f2b19f67ae
This simplifies the driver significantly where it is constructing commands to be submitted to hardware. By reducing the number of PRPs (NVMe parlance for SGE) from 128 to 32, it ensures we do not allocate too much memory for more common smaller I/O sizes, while still supporting up to 128KB I/O sizes. This also paves the way for pre-allocation of nvme_tracker objects for each queue which will simplify the I/O path even further. Sponsored by: Intel
193 lines
4.5 KiB
C
193 lines
4.5 KiB
C
/*-
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* Copyright (C) 2012 Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include "nvme_private.h"
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static void
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nvme_uio_done(void *arg, const struct nvme_completion *status)
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{
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struct mtx *mtx;
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/* TODO: update uio flags based on status */
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mtx = mtx_pool_find(mtxpool_sleep, arg);
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mtx_lock(mtx);
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wakeup(arg);
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mtx_unlock(mtx);
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}
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static struct nvme_tracker *
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nvme_allocate_tracker_uio(struct nvme_controller *ctrlr, struct uio *uio)
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{
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struct nvme_tracker *tr;
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struct nvme_qpair *qpair;
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if (ctrlr->per_cpu_io_queues)
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qpair = &ctrlr->ioq[curcpu];
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else
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qpair = &ctrlr->ioq[0];
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tr = nvme_qpair_allocate_tracker(qpair);
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if (tr == NULL)
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return (NULL);
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memset(&tr->cmd, 0, sizeof(tr->cmd));
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tr->qpair = qpair;
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tr->cb_fn = nvme_uio_done;
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tr->cb_arg = uio;
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return (tr);
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}
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static void
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nvme_payload_map_uio(void *arg, bus_dma_segment_t *seg, int nseg,
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bus_size_t mapsize, int error)
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{
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nvme_payload_map(arg, seg, nseg, error);
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}
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static int
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nvme_read_uio(struct nvme_namespace *ns, struct uio *uio)
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{
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struct nvme_tracker *tr;
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struct nvme_command *cmd;
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int err, i;
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uint64_t lba, iosize = 0;
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tr = nvme_allocate_tracker_uio(ns->ctrlr, uio);
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if (tr == NULL)
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return (ENOMEM);
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cmd = &tr->cmd;
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cmd->opc = NVME_OPC_READ;
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cmd->nsid = ns->id;
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lba = uio->uio_offset / nvme_ns_get_sector_size(ns);
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*(uint64_t *)&cmd->cdw10 = lba;
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for (i = 0; i < uio->uio_iovcnt; i++) {
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iosize += uio->uio_iov[i].iov_len;
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}
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cmd->cdw12 = (iosize / nvme_ns_get_sector_size(ns))-1;
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err = bus_dmamap_load_uio(tr->qpair->dma_tag, tr->payload_dma_map, uio,
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nvme_payload_map_uio, tr, 0);
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KASSERT(err == 0, ("bus_dmamap_load_uio returned non-zero!\n"));
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return (0);
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}
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static int
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nvme_write_uio(struct nvme_namespace *ns, struct uio *uio)
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{
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struct nvme_tracker *tr;
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struct nvme_command *cmd;
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int err, i;
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uint64_t lba, iosize = 0;
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tr = nvme_allocate_tracker_uio(ns->ctrlr, uio);
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if (tr == NULL)
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return (ENOMEM);
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cmd = &tr->cmd;
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cmd->opc = NVME_OPC_WRITE;
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cmd->nsid = ns->id;
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lba = uio->uio_offset / nvme_ns_get_sector_size(ns);
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*(uint64_t *)&cmd->cdw10 = lba;
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for (i = 0; i < uio->uio_iovcnt; i++) {
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iosize += uio->uio_iov[i].iov_len;
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}
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cmd->cdw12 = (iosize / nvme_ns_get_sector_size(ns))-1;
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err = bus_dmamap_load_uio(tr->qpair->dma_tag, tr->payload_dma_map, uio,
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nvme_payload_map_uio, tr, 0);
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KASSERT(err == 0, ("bus_dmamap_load_uio returned non-zero!\n"));
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return (0);
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}
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int
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nvme_ns_physio(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct nvme_namespace *ns;
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struct mtx *mtx;
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int err;
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#if __FreeBSD_version > 900017
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int ref;
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#endif
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PHOLD(curproc);
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ns = dev->si_drv1;
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mtx = mtx_pool_find(mtxpool_sleep, uio);
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#if __FreeBSD_version > 900017
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dev_refthread(dev, &ref);
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#else
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dev_refthread(dev);
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#endif
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mtx_lock(mtx);
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if (uio->uio_rw == UIO_READ)
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err = nvme_read_uio(ns, uio);
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else
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err = nvme_write_uio(ns, uio);
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if (err == 0)
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msleep(uio, mtx, PRIBIO, "nvme_physio", 0);
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mtx_unlock(mtx);
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#if __FreeBSD_version > 900017
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dev_relthread(dev, ref);
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#else
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dev_relthread(dev);
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#endif
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if (err == 0)
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uio->uio_resid = 0;
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PRELE(curproc);
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return (0);
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}
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