2 * Copyright (C) 2012-2016 Intel Corporation
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
37 #include <sys/ioccom.h>
42 #include <dev/pci/pcireg.h>
43 #include <dev/pci/pcivar.h>
45 #include "nvme_private.h"
47 static void nvme_ctrlr_construct_and_submit_aer(struct nvme_controller *ctrlr,
48 struct nvme_async_event_request *aer);
49 static void nvme_ctrlr_setup_interrupts(struct nvme_controller *ctrlr);
52 nvme_ctrlr_allocate_bar(struct nvme_controller *ctrlr)
55 ctrlr->resource_id = PCIR_BAR(0);
57 ctrlr->resource = bus_alloc_resource_any(ctrlr->dev, SYS_RES_MEMORY,
58 &ctrlr->resource_id, RF_ACTIVE);
60 if(ctrlr->resource == NULL) {
61 nvme_printf(ctrlr, "unable to allocate pci resource\n");
65 ctrlr->bus_tag = rman_get_bustag(ctrlr->resource);
66 ctrlr->bus_handle = rman_get_bushandle(ctrlr->resource);
67 ctrlr->regs = (struct nvme_registers *)ctrlr->bus_handle;
70 * The NVMe spec allows for the MSI-X table to be placed behind
71 * BAR 4/5, separate from the control/doorbell registers. Always
72 * try to map this bar, because it must be mapped prior to calling
73 * pci_alloc_msix(). If the table isn't behind BAR 4/5,
74 * bus_alloc_resource() will just return NULL which is OK.
76 ctrlr->bar4_resource_id = PCIR_BAR(4);
77 ctrlr->bar4_resource = bus_alloc_resource_any(ctrlr->dev, SYS_RES_MEMORY,
78 &ctrlr->bar4_resource_id, RF_ACTIVE);
84 nvme_ctrlr_construct_admin_qpair(struct nvme_controller *ctrlr)
86 struct nvme_qpair *qpair;
90 qpair = &ctrlr->adminq;
92 num_entries = NVME_ADMIN_ENTRIES;
93 TUNABLE_INT_FETCH("hw.nvme.admin_entries", &num_entries);
95 * If admin_entries was overridden to an invalid value, revert it
96 * back to our default value.
98 if (num_entries < NVME_MIN_ADMIN_ENTRIES ||
99 num_entries > NVME_MAX_ADMIN_ENTRIES) {
100 nvme_printf(ctrlr, "invalid hw.nvme.admin_entries=%d "
101 "specified\n", num_entries);
102 num_entries = NVME_ADMIN_ENTRIES;
106 * The admin queue's max xfer size is treated differently than the
107 * max I/O xfer size. 16KB is sufficient here - maybe even less?
109 error = nvme_qpair_construct(qpair,
119 nvme_ctrlr_construct_io_qpairs(struct nvme_controller *ctrlr)
121 struct nvme_qpair *qpair;
122 union cap_lo_register cap_lo;
123 int i, error, num_entries, num_trackers;
125 num_entries = NVME_IO_ENTRIES;
126 TUNABLE_INT_FETCH("hw.nvme.io_entries", &num_entries);
129 * NVMe spec sets a hard limit of 64K max entries, but
130 * devices may specify a smaller limit, so we need to check
131 * the MQES field in the capabilities register.
133 cap_lo.raw = nvme_mmio_read_4(ctrlr, cap_lo);
134 num_entries = min(num_entries, cap_lo.bits.mqes+1);
136 num_trackers = NVME_IO_TRACKERS;
137 TUNABLE_INT_FETCH("hw.nvme.io_trackers", &num_trackers);
139 num_trackers = max(num_trackers, NVME_MIN_IO_TRACKERS);
140 num_trackers = min(num_trackers, NVME_MAX_IO_TRACKERS);
142 * No need to have more trackers than entries in the submit queue.
143 * Note also that for a queue size of N, we can only have (N-1)
144 * commands outstanding, hence the "-1" here.
146 num_trackers = min(num_trackers, (num_entries-1));
149 * This was calculated previously when setting up interrupts, but
150 * a controller could theoretically support fewer I/O queues than
151 * MSI-X vectors. So calculate again here just to be safe.
153 ctrlr->num_cpus_per_ioq = howmany(mp_ncpus, ctrlr->num_io_queues);
155 ctrlr->ioq = malloc(ctrlr->num_io_queues * sizeof(struct nvme_qpair),
156 M_NVME, M_ZERO | M_WAITOK);
158 for (i = 0; i < ctrlr->num_io_queues; i++) {
159 qpair = &ctrlr->ioq[i];
162 * Admin queue has ID=0. IO queues start at ID=1 -
163 * hence the 'i+1' here.
165 * For I/O queues, use the controller-wide max_xfer_size
166 * calculated in nvme_attach().
168 error = nvme_qpair_construct(qpair,
170 ctrlr->msix_enabled ? i+1 : 0, /* vector */
178 * Do not bother binding interrupts if we only have one I/O
179 * interrupt thread for this controller.
181 if (ctrlr->num_io_queues > 1)
182 bus_bind_intr(ctrlr->dev, qpair->res,
183 i * ctrlr->num_cpus_per_ioq);
190 nvme_ctrlr_fail(struct nvme_controller *ctrlr)
194 ctrlr->is_failed = TRUE;
195 nvme_qpair_fail(&ctrlr->adminq);
196 for (i = 0; i < ctrlr->num_io_queues; i++)
197 nvme_qpair_fail(&ctrlr->ioq[i]);
198 nvme_notify_fail_consumers(ctrlr);
202 nvme_ctrlr_post_failed_request(struct nvme_controller *ctrlr,
203 struct nvme_request *req)
206 mtx_lock(&ctrlr->lock);
207 STAILQ_INSERT_TAIL(&ctrlr->fail_req, req, stailq);
208 mtx_unlock(&ctrlr->lock);
209 taskqueue_enqueue(ctrlr->taskqueue, &ctrlr->fail_req_task);
213 nvme_ctrlr_fail_req_task(void *arg, int pending)
215 struct nvme_controller *ctrlr = arg;
216 struct nvme_request *req;
218 mtx_lock(&ctrlr->lock);
219 while (!STAILQ_EMPTY(&ctrlr->fail_req)) {
220 req = STAILQ_FIRST(&ctrlr->fail_req);
221 STAILQ_REMOVE_HEAD(&ctrlr->fail_req, stailq);
222 nvme_qpair_manual_complete_request(req->qpair, req,
223 NVME_SCT_GENERIC, NVME_SC_ABORTED_BY_REQUEST, TRUE);
225 mtx_unlock(&ctrlr->lock);
229 nvme_ctrlr_wait_for_ready(struct nvme_controller *ctrlr, int desired_val)
232 union cc_register cc;
233 union csts_register csts;
235 cc.raw = nvme_mmio_read_4(ctrlr, cc);
236 csts.raw = nvme_mmio_read_4(ctrlr, csts);
238 if (cc.bits.en != desired_val) {
239 nvme_printf(ctrlr, "%s called with desired_val = %d "
240 "but cc.en = %d\n", __func__, desired_val, cc.bits.en);
246 while (csts.bits.rdy != desired_val) {
248 if (ms_waited++ > ctrlr->ready_timeout_in_ms) {
249 nvme_printf(ctrlr, "controller ready did not become %d "
250 "within %d ms\n", desired_val, ctrlr->ready_timeout_in_ms);
253 csts.raw = nvme_mmio_read_4(ctrlr, csts);
260 nvme_ctrlr_disable(struct nvme_controller *ctrlr)
262 union cc_register cc;
263 union csts_register csts;
265 cc.raw = nvme_mmio_read_4(ctrlr, cc);
266 csts.raw = nvme_mmio_read_4(ctrlr, csts);
268 if (cc.bits.en == 1 && csts.bits.rdy == 0)
269 nvme_ctrlr_wait_for_ready(ctrlr, 1);
272 nvme_mmio_write_4(ctrlr, cc, cc.raw);
274 nvme_ctrlr_wait_for_ready(ctrlr, 0);
278 nvme_ctrlr_enable(struct nvme_controller *ctrlr)
280 union cc_register cc;
281 union csts_register csts;
282 union aqa_register aqa;
284 cc.raw = nvme_mmio_read_4(ctrlr, cc);
285 csts.raw = nvme_mmio_read_4(ctrlr, csts);
287 if (cc.bits.en == 1) {
288 if (csts.bits.rdy == 1)
291 return (nvme_ctrlr_wait_for_ready(ctrlr, 1));
294 nvme_mmio_write_8(ctrlr, asq, ctrlr->adminq.cmd_bus_addr);
296 nvme_mmio_write_8(ctrlr, acq, ctrlr->adminq.cpl_bus_addr);
300 /* acqs and asqs are 0-based. */
301 aqa.bits.acqs = ctrlr->adminq.num_entries-1;
302 aqa.bits.asqs = ctrlr->adminq.num_entries-1;
303 nvme_mmio_write_4(ctrlr, aqa, aqa.raw);
310 cc.bits.iosqes = 6; /* SQ entry size == 64 == 2^6 */
311 cc.bits.iocqes = 4; /* CQ entry size == 16 == 2^4 */
313 /* This evaluates to 0, which is according to spec. */
314 cc.bits.mps = (PAGE_SIZE >> 13);
316 nvme_mmio_write_4(ctrlr, cc, cc.raw);
319 return (nvme_ctrlr_wait_for_ready(ctrlr, 1));
323 nvme_ctrlr_hw_reset(struct nvme_controller *ctrlr)
327 nvme_admin_qpair_disable(&ctrlr->adminq);
329 * I/O queues are not allocated before the initial HW
330 * reset, so do not try to disable them. Use is_initialized
331 * to determine if this is the initial HW reset.
333 if (ctrlr->is_initialized) {
334 for (i = 0; i < ctrlr->num_io_queues; i++)
335 nvme_io_qpair_disable(&ctrlr->ioq[i]);
340 nvme_ctrlr_disable(ctrlr);
341 return (nvme_ctrlr_enable(ctrlr));
345 nvme_ctrlr_reset(struct nvme_controller *ctrlr)
349 cmpset = atomic_cmpset_32(&ctrlr->is_resetting, 0, 1);
351 if (cmpset == 0 || ctrlr->is_failed)
353 * Controller is already resetting or has failed. Return
354 * immediately since there is no need to kick off another
355 * reset in these cases.
359 taskqueue_enqueue(ctrlr->taskqueue, &ctrlr->reset_task);
363 nvme_ctrlr_identify(struct nvme_controller *ctrlr)
365 struct nvme_completion_poll_status status;
368 nvme_ctrlr_cmd_identify_controller(ctrlr, &ctrlr->cdata,
369 nvme_completion_poll_cb, &status);
370 while (status.done == FALSE)
372 if (nvme_completion_is_error(&status.cpl)) {
373 nvme_printf(ctrlr, "nvme_identify_controller failed!\n");
378 * Use MDTS to ensure our default max_xfer_size doesn't exceed what the
379 * controller supports.
381 if (ctrlr->cdata.mdts > 0)
382 ctrlr->max_xfer_size = min(ctrlr->max_xfer_size,
383 ctrlr->min_page_size * (1 << (ctrlr->cdata.mdts)));
389 nvme_ctrlr_set_num_qpairs(struct nvme_controller *ctrlr)
391 struct nvme_completion_poll_status status;
392 int cq_allocated, sq_allocated;
395 nvme_ctrlr_cmd_set_num_queues(ctrlr, ctrlr->num_io_queues,
396 nvme_completion_poll_cb, &status);
397 while (status.done == FALSE)
399 if (nvme_completion_is_error(&status.cpl)) {
400 nvme_printf(ctrlr, "nvme_set_num_queues failed!\n");
405 * Data in cdw0 is 0-based.
406 * Lower 16-bits indicate number of submission queues allocated.
407 * Upper 16-bits indicate number of completion queues allocated.
409 sq_allocated = (status.cpl.cdw0 & 0xFFFF) + 1;
410 cq_allocated = (status.cpl.cdw0 >> 16) + 1;
413 * Controller may allocate more queues than we requested,
414 * so use the minimum of the number requested and what was
415 * actually allocated.
417 ctrlr->num_io_queues = min(ctrlr->num_io_queues, sq_allocated);
418 ctrlr->num_io_queues = min(ctrlr->num_io_queues, cq_allocated);
424 nvme_ctrlr_create_qpairs(struct nvme_controller *ctrlr)
426 struct nvme_completion_poll_status status;
427 struct nvme_qpair *qpair;
430 for (i = 0; i < ctrlr->num_io_queues; i++) {
431 qpair = &ctrlr->ioq[i];
434 nvme_ctrlr_cmd_create_io_cq(ctrlr, qpair, qpair->vector,
435 nvme_completion_poll_cb, &status);
436 while (status.done == FALSE)
438 if (nvme_completion_is_error(&status.cpl)) {
439 nvme_printf(ctrlr, "nvme_create_io_cq failed!\n");
444 nvme_ctrlr_cmd_create_io_sq(qpair->ctrlr, qpair,
445 nvme_completion_poll_cb, &status);
446 while (status.done == FALSE)
448 if (nvme_completion_is_error(&status.cpl)) {
449 nvme_printf(ctrlr, "nvme_create_io_sq failed!\n");
458 nvme_ctrlr_construct_namespaces(struct nvme_controller *ctrlr)
460 struct nvme_namespace *ns;
463 for (i = 0; i < ctrlr->cdata.nn; i++) {
465 status = nvme_ns_construct(ns, i+1, ctrlr);
474 is_log_page_id_valid(uint8_t page_id)
479 case NVME_LOG_HEALTH_INFORMATION:
480 case NVME_LOG_FIRMWARE_SLOT:
488 nvme_ctrlr_get_log_page_size(struct nvme_controller *ctrlr, uint8_t page_id)
490 uint32_t log_page_size;
495 sizeof(struct nvme_error_information_entry) *
497 NVME_MAX_AER_LOG_SIZE);
499 case NVME_LOG_HEALTH_INFORMATION:
500 log_page_size = sizeof(struct nvme_health_information_page);
502 case NVME_LOG_FIRMWARE_SLOT:
503 log_page_size = sizeof(struct nvme_firmware_page);
510 return (log_page_size);
514 nvme_ctrlr_log_critical_warnings(struct nvme_controller *ctrlr,
515 union nvme_critical_warning_state state)
518 if (state.bits.available_spare == 1)
519 nvme_printf(ctrlr, "available spare space below threshold\n");
521 if (state.bits.temperature == 1)
522 nvme_printf(ctrlr, "temperature above threshold\n");
524 if (state.bits.device_reliability == 1)
525 nvme_printf(ctrlr, "device reliability degraded\n");
527 if (state.bits.read_only == 1)
528 nvme_printf(ctrlr, "media placed in read only mode\n");
530 if (state.bits.volatile_memory_backup == 1)
531 nvme_printf(ctrlr, "volatile memory backup device failed\n");
533 if (state.bits.reserved != 0)
535 "unknown critical warning(s): state = 0x%02x\n", state.raw);
539 nvme_ctrlr_async_event_log_page_cb(void *arg, const struct nvme_completion *cpl)
541 struct nvme_async_event_request *aer = arg;
542 struct nvme_health_information_page *health_info;
545 * If the log page fetch for some reason completed with an error,
546 * don't pass log page data to the consumers. In practice, this case
547 * should never happen.
549 if (nvme_completion_is_error(cpl))
550 nvme_notify_async_consumers(aer->ctrlr, &aer->cpl,
551 aer->log_page_id, NULL, 0);
553 if (aer->log_page_id == NVME_LOG_HEALTH_INFORMATION) {
554 health_info = (struct nvme_health_information_page *)
555 aer->log_page_buffer;
556 nvme_ctrlr_log_critical_warnings(aer->ctrlr,
557 health_info->critical_warning);
559 * Critical warnings reported through the
560 * SMART/health log page are persistent, so
561 * clear the associated bits in the async event
562 * config so that we do not receive repeated
563 * notifications for the same event.
565 aer->ctrlr->async_event_config.raw &=
566 ~health_info->critical_warning.raw;
567 nvme_ctrlr_cmd_set_async_event_config(aer->ctrlr,
568 aer->ctrlr->async_event_config, NULL, NULL);
573 * Pass the cpl data from the original async event completion,
574 * not the log page fetch.
576 nvme_notify_async_consumers(aer->ctrlr, &aer->cpl,
577 aer->log_page_id, aer->log_page_buffer, aer->log_page_size);
581 * Repost another asynchronous event request to replace the one
582 * that just completed.
584 nvme_ctrlr_construct_and_submit_aer(aer->ctrlr, aer);
588 nvme_ctrlr_async_event_cb(void *arg, const struct nvme_completion *cpl)
590 struct nvme_async_event_request *aer = arg;
592 if (nvme_completion_is_error(cpl)) {
594 * Do not retry failed async event requests. This avoids
595 * infinite loops where a new async event request is submitted
596 * to replace the one just failed, only to fail again and
597 * perpetuate the loop.
602 /* Associated log page is in bits 23:16 of completion entry dw0. */
603 aer->log_page_id = (cpl->cdw0 & 0xFF0000) >> 16;
605 nvme_printf(aer->ctrlr, "async event occurred (log page id=0x%x)\n",
608 if (is_log_page_id_valid(aer->log_page_id)) {
609 aer->log_page_size = nvme_ctrlr_get_log_page_size(aer->ctrlr,
611 memcpy(&aer->cpl, cpl, sizeof(*cpl));
612 nvme_ctrlr_cmd_get_log_page(aer->ctrlr, aer->log_page_id,
613 NVME_GLOBAL_NAMESPACE_TAG, aer->log_page_buffer,
614 aer->log_page_size, nvme_ctrlr_async_event_log_page_cb,
616 /* Wait to notify consumers until after log page is fetched. */
618 nvme_notify_async_consumers(aer->ctrlr, cpl, aer->log_page_id,
622 * Repost another asynchronous event request to replace the one
623 * that just completed.
625 nvme_ctrlr_construct_and_submit_aer(aer->ctrlr, aer);
630 nvme_ctrlr_construct_and_submit_aer(struct nvme_controller *ctrlr,
631 struct nvme_async_event_request *aer)
633 struct nvme_request *req;
636 req = nvme_allocate_request_null(nvme_ctrlr_async_event_cb, aer);
640 * Disable timeout here, since asynchronous event requests should by
641 * nature never be timed out.
643 req->timeout = FALSE;
644 req->cmd.opc = NVME_OPC_ASYNC_EVENT_REQUEST;
645 nvme_ctrlr_submit_admin_request(ctrlr, req);
649 nvme_ctrlr_configure_aer(struct nvme_controller *ctrlr)
651 struct nvme_completion_poll_status status;
652 struct nvme_async_event_request *aer;
655 ctrlr->async_event_config.raw = 0xFF;
656 ctrlr->async_event_config.bits.reserved = 0;
659 nvme_ctrlr_cmd_get_feature(ctrlr, NVME_FEAT_TEMPERATURE_THRESHOLD,
660 0, NULL, 0, nvme_completion_poll_cb, &status);
661 while (status.done == FALSE)
663 if (nvme_completion_is_error(&status.cpl) ||
664 (status.cpl.cdw0 & 0xFFFF) == 0xFFFF ||
665 (status.cpl.cdw0 & 0xFFFF) == 0x0000) {
666 nvme_printf(ctrlr, "temperature threshold not supported\n");
667 ctrlr->async_event_config.bits.temperature = 0;
670 nvme_ctrlr_cmd_set_async_event_config(ctrlr,
671 ctrlr->async_event_config, NULL, NULL);
673 /* aerl is a zero-based value, so we need to add 1 here. */
674 ctrlr->num_aers = min(NVME_MAX_ASYNC_EVENTS, (ctrlr->cdata.aerl+1));
676 for (i = 0; i < ctrlr->num_aers; i++) {
677 aer = &ctrlr->aer[i];
678 nvme_ctrlr_construct_and_submit_aer(ctrlr, aer);
683 nvme_ctrlr_configure_int_coalescing(struct nvme_controller *ctrlr)
686 ctrlr->int_coal_time = 0;
687 TUNABLE_INT_FETCH("hw.nvme.int_coal_time",
688 &ctrlr->int_coal_time);
690 ctrlr->int_coal_threshold = 0;
691 TUNABLE_INT_FETCH("hw.nvme.int_coal_threshold",
692 &ctrlr->int_coal_threshold);
694 nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr, ctrlr->int_coal_time,
695 ctrlr->int_coal_threshold, NULL, NULL);
699 nvme_ctrlr_start(void *ctrlr_arg)
701 struct nvme_controller *ctrlr = ctrlr_arg;
702 uint32_t old_num_io_queues;
706 * Only reset adminq here when we are restarting the
707 * controller after a reset. During initialization,
708 * we have already submitted admin commands to get
709 * the number of I/O queues supported, so cannot reset
710 * the adminq again here.
712 if (ctrlr->is_resetting) {
713 nvme_qpair_reset(&ctrlr->adminq);
716 for (i = 0; i < ctrlr->num_io_queues; i++)
717 nvme_qpair_reset(&ctrlr->ioq[i]);
719 nvme_admin_qpair_enable(&ctrlr->adminq);
721 if (nvme_ctrlr_identify(ctrlr) != 0) {
722 nvme_ctrlr_fail(ctrlr);
727 * The number of qpairs are determined during controller initialization,
728 * including using NVMe SET_FEATURES/NUMBER_OF_QUEUES to determine the
729 * HW limit. We call SET_FEATURES again here so that it gets called
730 * after any reset for controllers that depend on the driver to
731 * explicit specify how many queues it will use. This value should
732 * never change between resets, so panic if somehow that does happen.
734 if (ctrlr->is_resetting) {
735 old_num_io_queues = ctrlr->num_io_queues;
736 if (nvme_ctrlr_set_num_qpairs(ctrlr) != 0) {
737 nvme_ctrlr_fail(ctrlr);
741 if (old_num_io_queues != ctrlr->num_io_queues) {
742 panic("num_io_queues changed from %u to %u",
743 old_num_io_queues, ctrlr->num_io_queues);
747 if (nvme_ctrlr_create_qpairs(ctrlr) != 0) {
748 nvme_ctrlr_fail(ctrlr);
752 if (nvme_ctrlr_construct_namespaces(ctrlr) != 0) {
753 nvme_ctrlr_fail(ctrlr);
757 nvme_ctrlr_configure_aer(ctrlr);
758 nvme_ctrlr_configure_int_coalescing(ctrlr);
760 for (i = 0; i < ctrlr->num_io_queues; i++)
761 nvme_io_qpair_enable(&ctrlr->ioq[i]);
765 nvme_ctrlr_start_config_hook(void *arg)
767 struct nvme_controller *ctrlr = arg;
769 nvme_qpair_reset(&ctrlr->adminq);
770 nvme_admin_qpair_enable(&ctrlr->adminq);
772 if (nvme_ctrlr_set_num_qpairs(ctrlr) == 0 &&
773 nvme_ctrlr_construct_io_qpairs(ctrlr) == 0)
774 nvme_ctrlr_start(ctrlr);
776 nvme_ctrlr_fail(ctrlr);
778 nvme_sysctl_initialize_ctrlr(ctrlr);
779 config_intrhook_disestablish(&ctrlr->config_hook);
781 ctrlr->is_initialized = 1;
782 nvme_notify_new_controller(ctrlr);
786 nvme_ctrlr_reset_task(void *arg, int pending)
788 struct nvme_controller *ctrlr = arg;
791 nvme_printf(ctrlr, "resetting controller\n");
792 status = nvme_ctrlr_hw_reset(ctrlr);
794 * Use pause instead of DELAY, so that we yield to any nvme interrupt
795 * handlers on this CPU that were blocked on a qpair lock. We want
796 * all nvme interrupts completed before proceeding with restarting the
799 * XXX - any way to guarantee the interrupt handlers have quiesced?
801 pause("nvmereset", hz / 10);
803 nvme_ctrlr_start(ctrlr);
805 nvme_ctrlr_fail(ctrlr);
807 atomic_cmpset_32(&ctrlr->is_resetting, 1, 0);
811 nvme_ctrlr_intx_handler(void *arg)
813 struct nvme_controller *ctrlr = arg;
815 nvme_mmio_write_4(ctrlr, intms, 1);
817 nvme_qpair_process_completions(&ctrlr->adminq);
819 if (ctrlr->ioq && ctrlr->ioq[0].cpl)
820 nvme_qpair_process_completions(&ctrlr->ioq[0]);
822 nvme_mmio_write_4(ctrlr, intmc, 1);
826 nvme_ctrlr_configure_intx(struct nvme_controller *ctrlr)
829 ctrlr->msix_enabled = 0;
830 ctrlr->num_io_queues = 1;
831 ctrlr->num_cpus_per_ioq = mp_ncpus;
833 ctrlr->res = bus_alloc_resource_any(ctrlr->dev, SYS_RES_IRQ,
834 &ctrlr->rid, RF_SHAREABLE | RF_ACTIVE);
836 if (ctrlr->res == NULL) {
837 nvme_printf(ctrlr, "unable to allocate shared IRQ\n");
841 bus_setup_intr(ctrlr->dev, ctrlr->res,
842 INTR_TYPE_MISC | INTR_MPSAFE, NULL, nvme_ctrlr_intx_handler,
845 if (ctrlr->tag == NULL) {
846 nvme_printf(ctrlr, "unable to setup intx handler\n");
854 nvme_pt_done(void *arg, const struct nvme_completion *cpl)
856 struct nvme_pt_command *pt = arg;
858 bzero(&pt->cpl, sizeof(pt->cpl));
859 pt->cpl.cdw0 = cpl->cdw0;
860 pt->cpl.status = cpl->status;
861 pt->cpl.status.p = 0;
863 mtx_lock(pt->driver_lock);
865 mtx_unlock(pt->driver_lock);
869 nvme_ctrlr_passthrough_cmd(struct nvme_controller *ctrlr,
870 struct nvme_pt_command *pt, uint32_t nsid, int is_user_buffer,
873 struct nvme_request *req;
875 struct buf *buf = NULL;
879 if (pt->len > ctrlr->max_xfer_size) {
880 nvme_printf(ctrlr, "pt->len (%d) "
881 "exceeds max_xfer_size (%d)\n", pt->len,
882 ctrlr->max_xfer_size);
885 if (is_user_buffer) {
887 * Ensure the user buffer is wired for the duration of
888 * this passthrough command.
892 buf->b_data = pt->buf;
893 buf->b_bufsize = pt->len;
894 buf->b_iocmd = pt->is_read ? BIO_READ : BIO_WRITE;
895 #ifdef NVME_UNMAPPED_BIO_SUPPORT
896 if (vmapbuf(buf, 1) < 0) {
898 if (vmapbuf(buf) < 0) {
903 req = nvme_allocate_request_vaddr(buf->b_data, pt->len,
906 req = nvme_allocate_request_vaddr(pt->buf, pt->len,
909 req = nvme_allocate_request_null(nvme_pt_done, pt);
911 req->cmd.opc = pt->cmd.opc;
912 req->cmd.cdw10 = pt->cmd.cdw10;
913 req->cmd.cdw11 = pt->cmd.cdw11;
914 req->cmd.cdw12 = pt->cmd.cdw12;
915 req->cmd.cdw13 = pt->cmd.cdw13;
916 req->cmd.cdw14 = pt->cmd.cdw14;
917 req->cmd.cdw15 = pt->cmd.cdw15;
919 req->cmd.nsid = nsid;
924 mtx = &ctrlr->ns[nsid-1].lock;
927 pt->driver_lock = mtx;
930 nvme_ctrlr_submit_admin_request(ctrlr, req);
932 nvme_ctrlr_submit_io_request(ctrlr, req);
934 mtx_sleep(pt, mtx, PRIBIO, "nvme_pt", 0);
937 pt->driver_lock = NULL;
949 nvme_ctrlr_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int flag,
952 struct nvme_controller *ctrlr;
953 struct nvme_pt_command *pt;
955 ctrlr = cdev->si_drv1;
958 case NVME_RESET_CONTROLLER:
959 nvme_ctrlr_reset(ctrlr);
961 case NVME_PASSTHROUGH_CMD:
962 pt = (struct nvme_pt_command *)arg;
963 return (nvme_ctrlr_passthrough_cmd(ctrlr, pt, pt->cmd.nsid,
964 1 /* is_user_buffer */, 1 /* is_admin_cmd */));
972 static struct cdevsw nvme_ctrlr_cdevsw = {
973 .d_version = D_VERSION,
975 .d_ioctl = nvme_ctrlr_ioctl
979 nvme_ctrlr_setup_interrupts(struct nvme_controller *ctrlr)
982 int per_cpu_io_queues;
983 int min_cpus_per_ioq;
984 int num_vectors_requested, num_vectors_allocated;
985 int num_vectors_available;
988 min_cpus_per_ioq = 1;
989 TUNABLE_INT_FETCH("hw.nvme.min_cpus_per_ioq", &min_cpus_per_ioq);
991 if (min_cpus_per_ioq < 1) {
992 min_cpus_per_ioq = 1;
993 } else if (min_cpus_per_ioq > mp_ncpus) {
994 min_cpus_per_ioq = mp_ncpus;
997 per_cpu_io_queues = 1;
998 TUNABLE_INT_FETCH("hw.nvme.per_cpu_io_queues", &per_cpu_io_queues);
1000 if (per_cpu_io_queues == 0) {
1001 min_cpus_per_ioq = mp_ncpus;
1004 ctrlr->force_intx = 0;
1005 TUNABLE_INT_FETCH("hw.nvme.force_intx", &ctrlr->force_intx);
1008 * FreeBSD currently cannot allocate more than about 190 vectors at
1009 * boot, meaning that systems with high core count and many devices
1010 * requesting per-CPU interrupt vectors will not get their full
1011 * allotment. So first, try to allocate as many as we may need to
1012 * understand what is available, then immediately release them.
1013 * Then figure out how many of those we will actually use, based on
1014 * assigning an equal number of cores to each I/O queue.
1017 /* One vector for per core I/O queue, plus one vector for admin queue. */
1018 num_vectors_available = min(pci_msix_count(dev), mp_ncpus + 1);
1019 if (pci_alloc_msix(dev, &num_vectors_available) != 0) {
1020 num_vectors_available = 0;
1022 pci_release_msi(dev);
1024 if (ctrlr->force_intx || num_vectors_available < 2) {
1025 nvme_ctrlr_configure_intx(ctrlr);
1030 * Do not use all vectors for I/O queues - one must be saved for the
1033 ctrlr->num_cpus_per_ioq = max(min_cpus_per_ioq,
1034 howmany(mp_ncpus, num_vectors_available - 1));
1036 ctrlr->num_io_queues = howmany(mp_ncpus, ctrlr->num_cpus_per_ioq);
1037 num_vectors_requested = ctrlr->num_io_queues + 1;
1038 num_vectors_allocated = num_vectors_requested;
1041 * Now just allocate the number of vectors we need. This should
1042 * succeed, since we previously called pci_alloc_msix()
1043 * successfully returning at least this many vectors, but just to
1044 * be safe, if something goes wrong just revert to INTx.
1046 if (pci_alloc_msix(dev, &num_vectors_allocated) != 0) {
1047 nvme_ctrlr_configure_intx(ctrlr);
1051 if (num_vectors_allocated < num_vectors_requested) {
1052 pci_release_msi(dev);
1053 nvme_ctrlr_configure_intx(ctrlr);
1057 ctrlr->msix_enabled = 1;
1061 nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
1063 union cap_lo_register cap_lo;
1064 union cap_hi_register cap_hi;
1065 int status, timeout_period;
1069 mtx_init(&ctrlr->lock, "nvme ctrlr lock", NULL, MTX_DEF);
1071 status = nvme_ctrlr_allocate_bar(ctrlr);
1077 * Software emulators may set the doorbell stride to something
1078 * other than zero, but this driver is not set up to handle that.
1080 cap_hi.raw = nvme_mmio_read_4(ctrlr, cap_hi);
1081 if (cap_hi.bits.dstrd != 0)
1084 ctrlr->min_page_size = 1 << (12 + cap_hi.bits.mpsmin);
1086 /* Get ready timeout value from controller, in units of 500ms. */
1087 cap_lo.raw = nvme_mmio_read_4(ctrlr, cap_lo);
1088 ctrlr->ready_timeout_in_ms = cap_lo.bits.to * 500;
1090 timeout_period = NVME_DEFAULT_TIMEOUT_PERIOD;
1091 TUNABLE_INT_FETCH("hw.nvme.timeout_period", &timeout_period);
1092 timeout_period = min(timeout_period, NVME_MAX_TIMEOUT_PERIOD);
1093 timeout_period = max(timeout_period, NVME_MIN_TIMEOUT_PERIOD);
1094 ctrlr->timeout_period = timeout_period;
1096 nvme_retry_count = NVME_DEFAULT_RETRY_COUNT;
1097 TUNABLE_INT_FETCH("hw.nvme.retry_count", &nvme_retry_count);
1099 ctrlr->enable_aborts = 0;
1100 TUNABLE_INT_FETCH("hw.nvme.enable_aborts", &ctrlr->enable_aborts);
1102 nvme_ctrlr_setup_interrupts(ctrlr);
1104 ctrlr->max_xfer_size = NVME_MAX_XFER_SIZE;
1105 if (nvme_ctrlr_construct_admin_qpair(ctrlr) != 0)
1108 ctrlr->cdev = make_dev(&nvme_ctrlr_cdevsw, device_get_unit(dev),
1109 UID_ROOT, GID_WHEEL, 0600, "nvme%d", device_get_unit(dev));
1111 if (ctrlr->cdev == NULL)
1114 ctrlr->cdev->si_drv1 = (void *)ctrlr;
1116 ctrlr->taskqueue = taskqueue_create("nvme_taskq", M_WAITOK,
1117 taskqueue_thread_enqueue, &ctrlr->taskqueue);
1118 taskqueue_start_threads(&ctrlr->taskqueue, 1, PI_DISK, "nvme taskq");
1120 ctrlr->is_resetting = 0;
1121 ctrlr->is_initialized = 0;
1122 ctrlr->notification_sent = 0;
1123 TASK_INIT(&ctrlr->reset_task, 0, nvme_ctrlr_reset_task, ctrlr);
1125 TASK_INIT(&ctrlr->fail_req_task, 0, nvme_ctrlr_fail_req_task, ctrlr);
1126 STAILQ_INIT(&ctrlr->fail_req);
1127 ctrlr->is_failed = FALSE;
1133 nvme_ctrlr_destruct(struct nvme_controller *ctrlr, device_t dev)
1138 * Notify the controller of a shutdown, even though this is due to
1139 * a driver unload, not a system shutdown (this path is not invoked
1140 * during shutdown). This ensures the controller receives a
1141 * shutdown notification in case the system is shutdown before
1142 * reloading the driver.
1144 nvme_ctrlr_shutdown(ctrlr);
1146 nvme_ctrlr_disable(ctrlr);
1147 taskqueue_free(ctrlr->taskqueue);
1149 for (i = 0; i < NVME_MAX_NAMESPACES; i++)
1150 nvme_ns_destruct(&ctrlr->ns[i]);
1153 destroy_dev(ctrlr->cdev);
1155 for (i = 0; i < ctrlr->num_io_queues; i++) {
1156 nvme_io_qpair_destroy(&ctrlr->ioq[i]);
1159 free(ctrlr->ioq, M_NVME);
1161 nvme_admin_qpair_destroy(&ctrlr->adminq);
1163 if (ctrlr->resource != NULL) {
1164 bus_release_resource(dev, SYS_RES_MEMORY,
1165 ctrlr->resource_id, ctrlr->resource);
1168 if (ctrlr->bar4_resource != NULL) {
1169 bus_release_resource(dev, SYS_RES_MEMORY,
1170 ctrlr->bar4_resource_id, ctrlr->bar4_resource);
1174 bus_teardown_intr(ctrlr->dev, ctrlr->res, ctrlr->tag);
1177 bus_release_resource(ctrlr->dev, SYS_RES_IRQ,
1178 rman_get_rid(ctrlr->res), ctrlr->res);
1180 if (ctrlr->msix_enabled)
1181 pci_release_msi(dev);
1185 nvme_ctrlr_shutdown(struct nvme_controller *ctrlr)
1187 union cc_register cc;
1188 union csts_register csts;
1191 cc.raw = nvme_mmio_read_4(ctrlr, cc);
1192 cc.bits.shn = NVME_SHN_NORMAL;
1193 nvme_mmio_write_4(ctrlr, cc, cc.raw);
1194 csts.raw = nvme_mmio_read_4(ctrlr, csts);
1195 while ((csts.bits.shst != NVME_SHST_COMPLETE) && (ticks++ < 5*hz)) {
1196 pause("nvme shn", 1);
1197 csts.raw = nvme_mmio_read_4(ctrlr, csts);
1199 if (csts.bits.shst != NVME_SHST_COMPLETE)
1200 nvme_printf(ctrlr, "did not complete shutdown within 5 seconds "
1201 "of notification\n");
1205 nvme_ctrlr_submit_admin_request(struct nvme_controller *ctrlr,
1206 struct nvme_request *req)
1209 nvme_qpair_submit_request(&ctrlr->adminq, req);
1213 nvme_ctrlr_submit_io_request(struct nvme_controller *ctrlr,
1214 struct nvme_request *req)
1216 struct nvme_qpair *qpair;
1218 qpair = &ctrlr->ioq[curcpu / ctrlr->num_cpus_per_ioq];
1219 nvme_qpair_submit_request(qpair, req);
1223 nvme_ctrlr_get_device(struct nvme_controller *ctrlr)
1226 return (ctrlr->dev);
1229 const struct nvme_controller_data *
1230 nvme_ctrlr_get_data(struct nvme_controller *ctrlr)
1233 return (&ctrlr->cdata);