332 lines
8.2 KiB
C
332 lines
8.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (C) 2012-2014 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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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/module.h>
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#include <vm/uma.h>
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#include "nvme_private.h"
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struct nvme_consumer {
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uint32_t id;
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nvme_cons_ns_fn_t ns_fn;
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nvme_cons_ctrlr_fn_t ctrlr_fn;
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nvme_cons_async_fn_t async_fn;
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nvme_cons_fail_fn_t fail_fn;
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};
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struct nvme_consumer nvme_consumer[NVME_MAX_CONSUMERS];
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#define INVALID_CONSUMER_ID 0xFFFF
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int32_t nvme_retry_count;
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MALLOC_DEFINE(M_NVME, "nvme", "nvme(4) memory allocations");
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static void
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nvme_init(void)
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{
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uint32_t i;
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for (i = 0; i < NVME_MAX_CONSUMERS; i++)
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nvme_consumer[i].id = INVALID_CONSUMER_ID;
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}
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SYSINIT(nvme_register, SI_SUB_DRIVERS, SI_ORDER_SECOND, nvme_init, NULL);
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static void
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nvme_uninit(void)
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{
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}
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SYSUNINIT(nvme_unregister, SI_SUB_DRIVERS, SI_ORDER_SECOND, nvme_uninit, NULL);
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int
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nvme_shutdown(device_t dev)
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{
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struct nvme_controller *ctrlr;
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ctrlr = DEVICE2SOFTC(dev);
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nvme_ctrlr_shutdown(ctrlr);
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return (0);
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}
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int
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nvme_attach(device_t dev)
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{
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struct nvme_controller *ctrlr = DEVICE2SOFTC(dev);
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int status;
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status = nvme_ctrlr_construct(ctrlr, dev);
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if (status != 0) {
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nvme_ctrlr_destruct(ctrlr, dev);
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return (status);
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}
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ctrlr->config_hook.ich_func = nvme_ctrlr_start_config_hook;
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ctrlr->config_hook.ich_arg = ctrlr;
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if (config_intrhook_establish(&ctrlr->config_hook) != 0)
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return (ENOMEM);
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return (0);
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}
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int
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nvme_detach(device_t dev)
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{
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struct nvme_controller *ctrlr = DEVICE2SOFTC(dev);
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config_intrhook_drain(&ctrlr->config_hook);
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nvme_ctrlr_destruct(ctrlr, dev);
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return (0);
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}
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static void
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nvme_notify(struct nvme_consumer *cons,
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struct nvme_controller *ctrlr)
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{
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struct nvme_namespace *ns;
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void *ctrlr_cookie;
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int cmpset, ns_idx;
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/*
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* The consumer may register itself after the nvme devices
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* have registered with the kernel, but before the
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* driver has completed initialization. In that case,
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* return here, and when initialization completes, the
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* controller will make sure the consumer gets notified.
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*/
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if (!ctrlr->is_initialized)
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return;
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cmpset = atomic_cmpset_32(&ctrlr->notification_sent, 0, 1);
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if (cmpset == 0)
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return;
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if (cons->ctrlr_fn != NULL)
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ctrlr_cookie = (*cons->ctrlr_fn)(ctrlr);
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else
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ctrlr_cookie = (void *)(uintptr_t)0xdeadc0dedeadc0de;
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ctrlr->cons_cookie[cons->id] = ctrlr_cookie;
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/* ctrlr_fn has failed. Nothing to notify here any more. */
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if (ctrlr_cookie == NULL) {
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(void)atomic_cmpset_32(&ctrlr->notification_sent, 1, 0);
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return;
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}
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if (ctrlr->is_failed) {
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ctrlr->cons_cookie[cons->id] = NULL;
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if (cons->fail_fn != NULL)
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(*cons->fail_fn)(ctrlr_cookie);
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/*
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* Do not notify consumers about the namespaces of a
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* failed controller.
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*/
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return;
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}
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for (ns_idx = 0; ns_idx < min(ctrlr->cdata.nn, NVME_MAX_NAMESPACES); ns_idx++) {
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ns = &ctrlr->ns[ns_idx];
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if (ns->data.nsze == 0)
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continue;
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if (cons->ns_fn != NULL)
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ns->cons_cookie[cons->id] =
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(*cons->ns_fn)(ns, ctrlr_cookie);
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}
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}
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void
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nvme_notify_new_controller(struct nvme_controller *ctrlr)
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{
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int i;
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for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
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if (nvme_consumer[i].id != INVALID_CONSUMER_ID) {
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nvme_notify(&nvme_consumer[i], ctrlr);
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}
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}
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}
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static void
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nvme_notify_new_consumer(struct nvme_consumer *cons)
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{
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device_t *devlist;
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struct nvme_controller *ctrlr;
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int dev_idx, devcount;
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if (devclass_get_devices(devclass_find("nvme"), &devlist, &devcount))
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return;
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for (dev_idx = 0; dev_idx < devcount; dev_idx++) {
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ctrlr = DEVICE2SOFTC(devlist[dev_idx]);
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nvme_notify(cons, ctrlr);
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}
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free(devlist, M_TEMP);
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}
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void
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nvme_notify_async_consumers(struct nvme_controller *ctrlr,
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const struct nvme_completion *async_cpl,
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uint32_t log_page_id, void *log_page_buffer,
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uint32_t log_page_size)
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{
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struct nvme_consumer *cons;
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void *ctrlr_cookie;
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uint32_t i;
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for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
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cons = &nvme_consumer[i];
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if (cons->id != INVALID_CONSUMER_ID && cons->async_fn != NULL &&
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(ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL) {
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(*cons->async_fn)(ctrlr_cookie, async_cpl,
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log_page_id, log_page_buffer, log_page_size);
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}
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}
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}
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void
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nvme_notify_fail_consumers(struct nvme_controller *ctrlr)
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{
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struct nvme_consumer *cons;
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void *ctrlr_cookie;
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uint32_t i;
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/*
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* This controller failed during initialization (i.e. IDENTIFY
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* command failed or timed out). Do not notify any nvme
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* consumers of the failure here, since the consumer does not
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* even know about the controller yet.
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*/
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if (!ctrlr->is_initialized)
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return;
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for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
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cons = &nvme_consumer[i];
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if (cons->id != INVALID_CONSUMER_ID &&
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(ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL) {
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ctrlr->cons_cookie[i] = NULL;
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if (cons->fail_fn != NULL)
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cons->fail_fn(ctrlr_cookie);
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}
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}
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}
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void
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nvme_notify_ns(struct nvme_controller *ctrlr, int nsid)
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{
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struct nvme_consumer *cons;
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struct nvme_namespace *ns;
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void *ctrlr_cookie;
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uint32_t i;
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KASSERT(nsid <= NVME_MAX_NAMESPACES,
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("%s: Namespace notification to nsid %d exceeds range\n",
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device_get_nameunit(ctrlr->dev), nsid));
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if (!ctrlr->is_initialized)
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return;
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ns = &ctrlr->ns[nsid - 1];
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for (i = 0; i < NVME_MAX_CONSUMERS; i++) {
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cons = &nvme_consumer[i];
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if (cons->id != INVALID_CONSUMER_ID && cons->ns_fn != NULL &&
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(ctrlr_cookie = ctrlr->cons_cookie[i]) != NULL)
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ns->cons_cookie[i] = (*cons->ns_fn)(ns, ctrlr_cookie);
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}
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}
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struct nvme_consumer *
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nvme_register_consumer(nvme_cons_ns_fn_t ns_fn, nvme_cons_ctrlr_fn_t ctrlr_fn,
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nvme_cons_async_fn_t async_fn,
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nvme_cons_fail_fn_t fail_fn)
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{
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int i;
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/*
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* TODO: add locking around consumer registration.
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*/
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for (i = 0; i < NVME_MAX_CONSUMERS; i++)
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if (nvme_consumer[i].id == INVALID_CONSUMER_ID) {
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nvme_consumer[i].id = i;
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nvme_consumer[i].ns_fn = ns_fn;
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nvme_consumer[i].ctrlr_fn = ctrlr_fn;
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nvme_consumer[i].async_fn = async_fn;
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nvme_consumer[i].fail_fn = fail_fn;
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nvme_notify_new_consumer(&nvme_consumer[i]);
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return (&nvme_consumer[i]);
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}
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printf("nvme(4): consumer not registered - no slots available\n");
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return (NULL);
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}
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void
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nvme_unregister_consumer(struct nvme_consumer *consumer)
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{
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consumer->id = INVALID_CONSUMER_ID;
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}
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void
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nvme_completion_poll_cb(void *arg, const struct nvme_completion *cpl)
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{
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struct nvme_completion_poll_status *status = arg;
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/*
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* Copy status into the argument passed by the caller, so that
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* the caller can check the status to determine if the
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* the request passed or failed.
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*/
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memcpy(&status->cpl, cpl, sizeof(*cpl));
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atomic_store_rel_int(&status->done, 1);
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}
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static int
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nvme_modevent(module_t mod __unused, int type __unused, void *argp __unused)
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{
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return (0);
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}
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static moduledata_t nvme_mod = {
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"nvme",
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nvme_modevent,
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0
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};
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DECLARE_MODULE(nvme, nvme_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
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MODULE_VERSION(nvme, 1);
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MODULE_DEPEND(nvme, cam, 1, 1, 1);
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