2015-09-21 15:52:41 +00:00
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
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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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*
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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "nvme_internal.h"
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/**
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* \file
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*
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*/
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2015-09-24 23:45:51 +00:00
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static struct nvme_request *
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_nvme_ns_cmd_rw(struct nvme_namespace *ns, void *payload, uint64_t lba,
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uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg,
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uint32_t opc);
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2015-09-28 17:53:57 +00:00
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static void
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nvme_cb_complete_child(void *child_arg, const struct nvme_completion *cpl)
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{
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struct nvme_request *child = child_arg;
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struct nvme_request *parent = child->parent;
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parent->num_children--;
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TAILQ_REMOVE(&parent->children, child, child_tailq);
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if (nvme_completion_is_error(cpl)) {
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memcpy(&parent->parent_status, cpl, sizeof(*cpl));
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}
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if (parent->num_children == 0) {
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if (parent->cb_fn) {
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parent->cb_fn(parent->cb_arg, &parent->parent_status);
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}
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nvme_free_request(parent);
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}
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}
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static void
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nvme_request_add_child(struct nvme_request *parent, struct nvme_request *child)
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{
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if (parent->num_children == 0) {
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/*
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* Defer initialization of the children TAILQ since it falls
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* on a separate cacheline. This ensures we do not touch this
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* cacheline except on request splitting cases, which are
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* relatively rare.
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*/
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TAILQ_INIT(&parent->children);
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memset(&parent->parent_status, 0, sizeof(struct nvme_completion));
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}
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parent->num_children++;
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TAILQ_INSERT_TAIL(&parent->children, child, child_tailq);
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child->parent = parent;
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child->cb_fn = nvme_cb_complete_child;
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child->cb_arg = child;
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}
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2015-09-24 23:45:51 +00:00
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static struct nvme_request *
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_nvme_ns_cmd_split_request(struct nvme_namespace *ns, void *payload,
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uint64_t lba, uint32_t lba_count,
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nvme_cb_fn_t cb_fn, void *cb_arg, uint32_t opc,
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struct nvme_request *req,
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uint32_t sectors_per_max_io, uint32_t sector_mask)
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{
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uint32_t sector_size = ns->sector_size;
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uint32_t remaining_lba_count = lba_count;
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struct nvme_request *child;
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while (remaining_lba_count > 0) {
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lba_count = sectors_per_max_io - (lba & sector_mask);
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lba_count = nvme_min(remaining_lba_count, lba_count);
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child = _nvme_ns_cmd_rw(ns, payload, lba, lba_count, cb_fn,
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cb_arg, opc);
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if (child == NULL) {
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nvme_free_request(req);
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return NULL;
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}
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nvme_request_add_child(req, child);
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remaining_lba_count -= lba_count;
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lba += lba_count;
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payload = (void *)((uintptr_t)payload + (lba_count * sector_size));
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}
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return req;
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}
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2015-09-21 15:52:41 +00:00
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static struct nvme_request *
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_nvme_ns_cmd_rw(struct nvme_namespace *ns, void *payload, uint64_t lba,
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uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg,
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uint32_t opc)
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{
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struct nvme_request *req;
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struct nvme_command *cmd;
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uint64_t *tmp_lba;
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uint32_t sector_size;
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uint32_t sectors_per_max_io;
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uint32_t sectors_per_stripe;
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sector_size = ns->sector_size;
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sectors_per_max_io = ns->sectors_per_max_io;
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sectors_per_stripe = ns->sectors_per_stripe;
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req = nvme_allocate_request(payload, lba_count * sector_size, cb_fn, cb_arg);
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if (req == NULL) {
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return NULL;
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}
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/*
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* Intel DC P3*00 NVMe controllers benefit from driver-assisted striping.
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* If this controller defines a stripe boundary and this I/O spans a stripe
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* boundary, split the request into multiple requests and submit each
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* separately to hardware.
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*/
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if (sectors_per_stripe > 0 &&
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(((lba & (sectors_per_stripe - 1)) + lba_count) > sectors_per_stripe)) {
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2015-09-24 23:45:51 +00:00
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return _nvme_ns_cmd_split_request(ns, payload, lba, lba_count, cb_fn, cb_arg, opc,
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req, sectors_per_stripe, sectors_per_stripe - 1);
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2015-09-21 15:52:41 +00:00
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} else if (lba_count > sectors_per_max_io) {
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2015-09-24 23:45:51 +00:00
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return _nvme_ns_cmd_split_request(ns, payload, lba, lba_count, cb_fn, cb_arg, opc,
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req, sectors_per_max_io, 0);
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2015-09-21 15:52:41 +00:00
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} else {
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cmd = &req->cmd;
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cmd->opc = opc;
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cmd->nsid = ns->id;
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tmp_lba = (uint64_t *)&cmd->cdw10;
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*tmp_lba = lba;
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cmd->cdw12 = lba_count - 1;
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}
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return req;
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}
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int
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nvme_ns_cmd_read(struct nvme_namespace *ns, void *payload, uint64_t lba,
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uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg)
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{
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struct nvme_request *req;
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req = _nvme_ns_cmd_rw(ns, payload, lba, lba_count, cb_fn, cb_arg, NVME_OPC_READ);
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if (req != NULL) {
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nvme_ctrlr_submit_io_request(ns->ctrlr, req);
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return 0;
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} else {
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return ENOMEM;
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}
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}
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int
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nvme_ns_cmd_write(struct nvme_namespace *ns, void *payload, uint64_t lba,
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uint32_t lba_count, nvme_cb_fn_t cb_fn, void *cb_arg)
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{
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struct nvme_request *req;
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req = _nvme_ns_cmd_rw(ns, payload, lba, lba_count, cb_fn, cb_arg, NVME_OPC_WRITE);
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if (req != NULL) {
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nvme_ctrlr_submit_io_request(ns->ctrlr, req);
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return 0;
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} else {
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return ENOMEM;
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}
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}
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int
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nvme_ns_cmd_deallocate(struct nvme_namespace *ns, void *payload,
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uint8_t num_ranges, nvme_cb_fn_t cb_fn, void *cb_arg)
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{
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struct nvme_request *req;
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struct nvme_command *cmd;
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if (num_ranges == 0) {
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return EINVAL;
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}
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req = nvme_allocate_request(payload,
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num_ranges * sizeof(struct nvme_dsm_range),
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cb_fn, cb_arg);
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if (req == NULL) {
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return ENOMEM;
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}
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cmd = &req->cmd;
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cmd->opc = NVME_OPC_DATASET_MANAGEMENT;
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cmd->nsid = ns->id;
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/* TODO: create a delete command data structure */
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cmd->cdw10 = num_ranges - 1;
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cmd->cdw11 = NVME_DSM_ATTR_DEALLOCATE;
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nvme_ctrlr_submit_io_request(ns->ctrlr, req);
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return 0;
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}
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int
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nvme_ns_cmd_flush(struct nvme_namespace *ns, nvme_cb_fn_t cb_fn, void *cb_arg)
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{
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struct nvme_request *req;
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struct nvme_command *cmd;
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req = nvme_allocate_request(NULL, 0, cb_fn, cb_arg);
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if (req == NULL) {
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return ENOMEM;
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}
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cmd = &req->cmd;
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cmd->opc = NVME_OPC_FLUSH;
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cmd->nsid = ns->id;
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nvme_ctrlr_submit_io_request(ns->ctrlr, req);
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return 0;
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}
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