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freebsd-skq/sys/dev/nvme/nvme_ctrlr.c
Jim Harris f42ca756b9 nvme: Allocate all MSI resources up front so that we can fall back to 
INTx if necessary.

Sponsored by:	Intel
MFC after:	3 days
2014-03-18 18:10:35 +00:00

1348 lines
34 KiB
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/*-
* Copyright (C) 2012-2014 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/systm.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/ioccom.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/uio.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include "nvme_private.h"
static void nvme_ctrlr_construct_and_submit_aer(struct nvme_controller *ctrlr,
struct nvme_async_event_request *aer);
static int
nvme_ctrlr_allocate_bar(struct nvme_controller *ctrlr)
{
/* Chatham puts the NVMe MMRs behind BAR 2/3, not BAR 0/1. */
if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID)
ctrlr->resource_id = PCIR_BAR(2);
else
ctrlr->resource_id = PCIR_BAR(0);
ctrlr->resource = bus_alloc_resource(ctrlr->dev, SYS_RES_MEMORY,
&ctrlr->resource_id, 0, ~0, 1, RF_ACTIVE);
if(ctrlr->resource == NULL) {
nvme_printf(ctrlr, "unable to allocate pci resource\n");
return (ENOMEM);
}
ctrlr->bus_tag = rman_get_bustag(ctrlr->resource);
ctrlr->bus_handle = rman_get_bushandle(ctrlr->resource);
ctrlr->regs = (struct nvme_registers *)ctrlr->bus_handle;
/*
* The NVMe spec allows for the MSI-X table to be placed behind
* BAR 4/5, separate from the control/doorbell registers. Always
* try to map this bar, because it must be mapped prior to calling
* pci_alloc_msix(). If the table isn't behind BAR 4/5,
* bus_alloc_resource() will just return NULL which is OK.
*/
ctrlr->bar4_resource_id = PCIR_BAR(4);
ctrlr->bar4_resource = bus_alloc_resource(ctrlr->dev, SYS_RES_MEMORY,
&ctrlr->bar4_resource_id, 0, ~0, 1, RF_ACTIVE);
return (0);
}
#ifdef CHATHAM2
static int
nvme_ctrlr_allocate_chatham_bar(struct nvme_controller *ctrlr)
{
ctrlr->chatham_resource_id = PCIR_BAR(CHATHAM_CONTROL_BAR);
ctrlr->chatham_resource = bus_alloc_resource(ctrlr->dev,
SYS_RES_MEMORY, &ctrlr->chatham_resource_id, 0, ~0, 1,
RF_ACTIVE);
if(ctrlr->chatham_resource == NULL) {
nvme_printf(ctrlr, "unable to alloc pci resource\n");
return (ENOMEM);
}
ctrlr->chatham_bus_tag = rman_get_bustag(ctrlr->chatham_resource);
ctrlr->chatham_bus_handle =
rman_get_bushandle(ctrlr->chatham_resource);
return (0);
}
static void
nvme_ctrlr_setup_chatham(struct nvme_controller *ctrlr)
{
uint64_t reg1, reg2, reg3;
uint64_t temp1, temp2;
uint32_t temp3;
uint32_t use_flash_timings = 0;
DELAY(10000);
temp3 = chatham_read_4(ctrlr, 0x8080);
device_printf(ctrlr->dev, "Chatham version: 0x%x\n", temp3);
ctrlr->chatham_lbas = chatham_read_4(ctrlr, 0x8068) - 0x110;
ctrlr->chatham_size = ctrlr->chatham_lbas * 512;
device_printf(ctrlr->dev, "Chatham size: %jd\n",
(intmax_t)ctrlr->chatham_size);
reg1 = reg2 = reg3 = ctrlr->chatham_size - 1;
TUNABLE_INT_FETCH("hw.nvme.use_flash_timings", &use_flash_timings);
if (use_flash_timings) {
device_printf(ctrlr->dev, "Chatham: using flash timings\n");
temp1 = 0x00001b58000007d0LL;
temp2 = 0x000000cb00000131LL;
} else {
device_printf(ctrlr->dev, "Chatham: using DDR timings\n");
temp1 = temp2 = 0x0LL;
}
chatham_write_8(ctrlr, 0x8000, reg1);
chatham_write_8(ctrlr, 0x8008, reg2);
chatham_write_8(ctrlr, 0x8010, reg3);
chatham_write_8(ctrlr, 0x8020, temp1);
temp3 = chatham_read_4(ctrlr, 0x8020);
chatham_write_8(ctrlr, 0x8028, temp2);
temp3 = chatham_read_4(ctrlr, 0x8028);
chatham_write_8(ctrlr, 0x8030, temp1);
chatham_write_8(ctrlr, 0x8038, temp2);
chatham_write_8(ctrlr, 0x8040, temp1);
chatham_write_8(ctrlr, 0x8048, temp2);
chatham_write_8(ctrlr, 0x8050, temp1);
chatham_write_8(ctrlr, 0x8058, temp2);
DELAY(10000);
}
static void
nvme_chatham_populate_cdata(struct nvme_controller *ctrlr)
{
struct nvme_controller_data *cdata;
cdata = &ctrlr->cdata;
cdata->vid = 0x8086;
cdata->ssvid = 0x2011;
/*
* Chatham2 puts garbage data in these fields when we
* invoke IDENTIFY_CONTROLLER, so we need to re-zero
* the fields before calling bcopy().
*/
memset(cdata->sn, 0, sizeof(cdata->sn));
memcpy(cdata->sn, "2012", strlen("2012"));
memset(cdata->mn, 0, sizeof(cdata->mn));
memcpy(cdata->mn, "CHATHAM2", strlen("CHATHAM2"));
memset(cdata->fr, 0, sizeof(cdata->fr));
memcpy(cdata->fr, "0", strlen("0"));
cdata->rab = 8;
cdata->aerl = 3;
cdata->lpa.ns_smart = 1;
cdata->sqes.min = 6;
cdata->sqes.max = 6;
cdata->cqes.min = 4;
cdata->cqes.max = 4;
cdata->nn = 1;
/* Chatham2 doesn't support DSM command */
cdata->oncs.dsm = 0;
cdata->vwc.present = 1;
}
#endif /* CHATHAM2 */
static void
nvme_ctrlr_construct_admin_qpair(struct nvme_controller *ctrlr)
{
struct nvme_qpair *qpair;
uint32_t num_entries;
qpair = &ctrlr->adminq;
num_entries = NVME_ADMIN_ENTRIES;
TUNABLE_INT_FETCH("hw.nvme.admin_entries", &num_entries);
/*
* If admin_entries was overridden to an invalid value, revert it
* back to our default value.
*/
if (num_entries < NVME_MIN_ADMIN_ENTRIES ||
num_entries > NVME_MAX_ADMIN_ENTRIES) {
nvme_printf(ctrlr, "invalid hw.nvme.admin_entries=%d "
"specified\n", num_entries);
num_entries = NVME_ADMIN_ENTRIES;
}
/*
* The admin queue's max xfer size is treated differently than the
* max I/O xfer size. 16KB is sufficient here - maybe even less?
*/
nvme_qpair_construct(qpair,
0, /* qpair ID */
0, /* vector */
num_entries,
NVME_ADMIN_TRACKERS,
ctrlr);
}
static int
nvme_ctrlr_construct_io_qpairs(struct nvme_controller *ctrlr)
{
struct nvme_qpair *qpair;
union cap_lo_register cap_lo;
int i, num_entries, num_trackers;
num_entries = NVME_IO_ENTRIES;
TUNABLE_INT_FETCH("hw.nvme.io_entries", &num_entries);
/*
* NVMe spec sets a hard limit of 64K max entries, but
* devices may specify a smaller limit, so we need to check
* the MQES field in the capabilities register.
*/
cap_lo.raw = nvme_mmio_read_4(ctrlr, cap_lo);
num_entries = min(num_entries, cap_lo.bits.mqes+1);
num_trackers = NVME_IO_TRACKERS;
TUNABLE_INT_FETCH("hw.nvme.io_trackers", &num_trackers);
num_trackers = max(num_trackers, NVME_MIN_IO_TRACKERS);
num_trackers = min(num_trackers, NVME_MAX_IO_TRACKERS);
/*
* No need to have more trackers than entries in the submit queue.
* Note also that for a queue size of N, we can only have (N-1)
* commands outstanding, hence the "-1" here.
*/
num_trackers = min(num_trackers, (num_entries-1));
ctrlr->ioq = malloc(ctrlr->num_io_queues * sizeof(struct nvme_qpair),
M_NVME, M_ZERO | M_WAITOK);
for (i = 0; i < ctrlr->num_io_queues; i++) {
qpair = &ctrlr->ioq[i];
/*
* Admin queue has ID=0. IO queues start at ID=1 -
* hence the 'i+1' here.
*
* For I/O queues, use the controller-wide max_xfer_size
* calculated in nvme_attach().
*/
nvme_qpair_construct(qpair,
i+1, /* qpair ID */
ctrlr->msix_enabled ? i+1 : 0, /* vector */
num_entries,
num_trackers,
ctrlr);
if (ctrlr->per_cpu_io_queues)
bus_bind_intr(ctrlr->dev, qpair->res, i);
}
return (0);
}
static void
nvme_ctrlr_fail(struct nvme_controller *ctrlr)
{
int i;
ctrlr->is_failed = TRUE;
nvme_qpair_fail(&ctrlr->adminq);
for (i = 0; i < ctrlr->num_io_queues; i++)
nvme_qpair_fail(&ctrlr->ioq[i]);
nvme_notify_fail_consumers(ctrlr);
}
void
nvme_ctrlr_post_failed_request(struct nvme_controller *ctrlr,
struct nvme_request *req)
{
mtx_lock(&ctrlr->lock);
STAILQ_INSERT_TAIL(&ctrlr->fail_req, req, stailq);
mtx_unlock(&ctrlr->lock);
taskqueue_enqueue(ctrlr->taskqueue, &ctrlr->fail_req_task);
}
static void
nvme_ctrlr_fail_req_task(void *arg, int pending)
{
struct nvme_controller *ctrlr = arg;
struct nvme_request *req;
mtx_lock(&ctrlr->lock);
while (!STAILQ_EMPTY(&ctrlr->fail_req)) {
req = STAILQ_FIRST(&ctrlr->fail_req);
STAILQ_REMOVE_HEAD(&ctrlr->fail_req, stailq);
nvme_qpair_manual_complete_request(req->qpair, req,
NVME_SCT_GENERIC, NVME_SC_ABORTED_BY_REQUEST, TRUE);
}
mtx_unlock(&ctrlr->lock);
}
static int
nvme_ctrlr_wait_for_ready(struct nvme_controller *ctrlr)
{
int ms_waited;
union cc_register cc;
union csts_register csts;
cc.raw = nvme_mmio_read_4(ctrlr, cc);
csts.raw = nvme_mmio_read_4(ctrlr, csts);
if (!cc.bits.en) {
nvme_printf(ctrlr, "%s called with cc.en = 0\n", __func__);
return (ENXIO);
}
ms_waited = 0;
while (!csts.bits.rdy) {
DELAY(1000);
if (ms_waited++ > ctrlr->ready_timeout_in_ms) {
nvme_printf(ctrlr, "controller did not become ready "
"within %d ms\n", ctrlr->ready_timeout_in_ms);
return (ENXIO);
}
csts.raw = nvme_mmio_read_4(ctrlr, csts);
}
return (0);
}
static void
nvme_ctrlr_disable(struct nvme_controller *ctrlr)
{
union cc_register cc;
union csts_register csts;
cc.raw = nvme_mmio_read_4(ctrlr, cc);
csts.raw = nvme_mmio_read_4(ctrlr, csts);
if (cc.bits.en == 1 && csts.bits.rdy == 0)
nvme_ctrlr_wait_for_ready(ctrlr);
cc.bits.en = 0;
nvme_mmio_write_4(ctrlr, cc, cc.raw);
DELAY(5000);
}
static int
nvme_ctrlr_enable(struct nvme_controller *ctrlr)
{
union cc_register cc;
union csts_register csts;
union aqa_register aqa;
cc.raw = nvme_mmio_read_4(ctrlr, cc);
csts.raw = nvme_mmio_read_4(ctrlr, csts);
if (cc.bits.en == 1) {
if (csts.bits.rdy == 1)
return (0);
else
return (nvme_ctrlr_wait_for_ready(ctrlr));
}
nvme_mmio_write_8(ctrlr, asq, ctrlr->adminq.cmd_bus_addr);
DELAY(5000);
nvme_mmio_write_8(ctrlr, acq, ctrlr->adminq.cpl_bus_addr);
DELAY(5000);
aqa.raw = 0;
/* acqs and asqs are 0-based. */
aqa.bits.acqs = ctrlr->adminq.num_entries-1;
aqa.bits.asqs = ctrlr->adminq.num_entries-1;
nvme_mmio_write_4(ctrlr, aqa, aqa.raw);
DELAY(5000);
cc.bits.en = 1;
cc.bits.css = 0;
cc.bits.ams = 0;
cc.bits.shn = 0;
cc.bits.iosqes = 6; /* SQ entry size == 64 == 2^6 */
cc.bits.iocqes = 4; /* CQ entry size == 16 == 2^4 */
/* This evaluates to 0, which is according to spec. */
cc.bits.mps = (PAGE_SIZE >> 13);
nvme_mmio_write_4(ctrlr, cc, cc.raw);
DELAY(5000);
return (nvme_ctrlr_wait_for_ready(ctrlr));
}
int
nvme_ctrlr_hw_reset(struct nvme_controller *ctrlr)
{
int i;
nvme_admin_qpair_disable(&ctrlr->adminq);
for (i = 0; i < ctrlr->num_io_queues; i++)
nvme_io_qpair_disable(&ctrlr->ioq[i]);
DELAY(100*1000);
nvme_ctrlr_disable(ctrlr);
return (nvme_ctrlr_enable(ctrlr));
}
void
nvme_ctrlr_reset(struct nvme_controller *ctrlr)
{
int cmpset;
cmpset = atomic_cmpset_32(&ctrlr->is_resetting, 0, 1);
if (cmpset == 0 || ctrlr->is_failed)
/*
* Controller is already resetting or has failed. Return
* immediately since there is no need to kick off another
* reset in these cases.
*/
return;
taskqueue_enqueue(ctrlr->taskqueue, &ctrlr->reset_task);
}
static int
nvme_ctrlr_identify(struct nvme_controller *ctrlr)
{
struct nvme_completion_poll_status status;
status.done = FALSE;
nvme_ctrlr_cmd_identify_controller(ctrlr, &ctrlr->cdata,
nvme_completion_poll_cb, &status);
while (status.done == FALSE)
pause("nvme", 1);
if (nvme_completion_is_error(&status.cpl)) {
nvme_printf(ctrlr, "nvme_identify_controller failed!\n");
return (ENXIO);
}
#ifdef CHATHAM2
if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID)
nvme_chatham_populate_cdata(ctrlr);
#endif
/*
* Use MDTS to ensure our default max_xfer_size doesn't exceed what the
* controller supports.
*/
if (ctrlr->cdata.mdts > 0)
ctrlr->max_xfer_size = min(ctrlr->max_xfer_size,
ctrlr->min_page_size * (1 << (ctrlr->cdata.mdts)));
return (0);
}
static int
nvme_ctrlr_set_num_qpairs(struct nvme_controller *ctrlr)
{
struct nvme_completion_poll_status status;
int cq_allocated, i, sq_allocated;
status.done = FALSE;
nvme_ctrlr_cmd_set_num_queues(ctrlr, ctrlr->num_io_queues,
nvme_completion_poll_cb, &status);
while (status.done == FALSE)
pause("nvme", 1);
if (nvme_completion_is_error(&status.cpl)) {
nvme_printf(ctrlr, "nvme_set_num_queues failed!\n");
return (ENXIO);
}
/*
* Data in cdw0 is 0-based.
* Lower 16-bits indicate number of submission queues allocated.
* Upper 16-bits indicate number of completion queues allocated.
*/
sq_allocated = (status.cpl.cdw0 & 0xFFFF) + 1;
cq_allocated = (status.cpl.cdw0 >> 16) + 1;
/*
* Check that the controller was able to allocate the number of
* queues we requested. If not, revert to one IO queue pair.
*/
if (sq_allocated < ctrlr->num_io_queues ||
cq_allocated < ctrlr->num_io_queues) {
/*
* Destroy extra IO queue pairs that were created at
* controller construction time but are no longer
* needed. This will only happen when a controller
* supports fewer queues than MSI-X vectors. This
* is not the normal case, but does occur with the
* Chatham prototype board.
*/
for (i = 1; i < ctrlr->num_io_queues; i++)
nvme_io_qpair_destroy(&ctrlr->ioq[i]);
ctrlr->num_io_queues = 1;
ctrlr->per_cpu_io_queues = 0;
}
return (0);
}
static int
nvme_ctrlr_create_qpairs(struct nvme_controller *ctrlr)
{
struct nvme_completion_poll_status status;
struct nvme_qpair *qpair;
int i;
for (i = 0; i < ctrlr->num_io_queues; i++) {
qpair = &ctrlr->ioq[i];
status.done = FALSE;
nvme_ctrlr_cmd_create_io_cq(ctrlr, qpair, qpair->vector,
nvme_completion_poll_cb, &status);
while (status.done == FALSE)
pause("nvme", 1);
if (nvme_completion_is_error(&status.cpl)) {
nvme_printf(ctrlr, "nvme_create_io_cq failed!\n");
return (ENXIO);
}
status.done = FALSE;
nvme_ctrlr_cmd_create_io_sq(qpair->ctrlr, qpair,
nvme_completion_poll_cb, &status);
while (status.done == FALSE)
pause("nvme", 1);
if (nvme_completion_is_error(&status.cpl)) {
nvme_printf(ctrlr, "nvme_create_io_sq failed!\n");
return (ENXIO);
}
}
return (0);
}
static int
nvme_ctrlr_construct_namespaces(struct nvme_controller *ctrlr)
{
struct nvme_namespace *ns;
int i, status;
for (i = 0; i < ctrlr->cdata.nn; i++) {
ns = &ctrlr->ns[i];
status = nvme_ns_construct(ns, i+1, ctrlr);
if (status != 0)
return (status);
}
return (0);
}
static boolean_t
is_log_page_id_valid(uint8_t page_id)
{
switch (page_id) {
case NVME_LOG_ERROR:
case NVME_LOG_HEALTH_INFORMATION:
case NVME_LOG_FIRMWARE_SLOT:
return (TRUE);
}
return (FALSE);
}
static uint32_t
nvme_ctrlr_get_log_page_size(struct nvme_controller *ctrlr, uint8_t page_id)
{
uint32_t log_page_size;
switch (page_id) {
case NVME_LOG_ERROR:
log_page_size = min(
sizeof(struct nvme_error_information_entry) *
ctrlr->cdata.elpe,
NVME_MAX_AER_LOG_SIZE);
break;
case NVME_LOG_HEALTH_INFORMATION:
log_page_size = sizeof(struct nvme_health_information_page);
break;
case NVME_LOG_FIRMWARE_SLOT:
log_page_size = sizeof(struct nvme_firmware_page);
break;
default:
log_page_size = 0;
break;
}
return (log_page_size);
}
static void
nvme_ctrlr_log_critical_warnings(struct nvme_controller *ctrlr,
union nvme_critical_warning_state state)
{
if (state.bits.available_spare == 1)
nvme_printf(ctrlr, "available spare space below threshold\n");
if (state.bits.temperature == 1)
nvme_printf(ctrlr, "temperature above threshold\n");
if (state.bits.device_reliability == 1)
nvme_printf(ctrlr, "device reliability degraded\n");
if (state.bits.read_only == 1)
nvme_printf(ctrlr, "media placed in read only mode\n");
if (state.bits.volatile_memory_backup == 1)
nvme_printf(ctrlr, "volatile memory backup device failed\n");
if (state.bits.reserved != 0)
nvme_printf(ctrlr,
"unknown critical warning(s): state = 0x%02x\n", state.raw);
}
static void
nvme_ctrlr_async_event_log_page_cb(void *arg, const struct nvme_completion *cpl)
{
struct nvme_async_event_request *aer = arg;
struct nvme_health_information_page *health_info;
/*
* If the log page fetch for some reason completed with an error,
* don't pass log page data to the consumers. In practice, this case
* should never happen.
*/
if (nvme_completion_is_error(cpl))
nvme_notify_async_consumers(aer->ctrlr, &aer->cpl,
aer->log_page_id, NULL, 0);
else {
if (aer->log_page_id == NVME_LOG_HEALTH_INFORMATION) {
health_info = (struct nvme_health_information_page *)
aer->log_page_buffer;
nvme_ctrlr_log_critical_warnings(aer->ctrlr,
health_info->critical_warning);
/*
* Critical warnings reported through the
* SMART/health log page are persistent, so
* clear the associated bits in the async event
* config so that we do not receive repeated
* notifications for the same event.
*/
aer->ctrlr->async_event_config.raw &=
~health_info->critical_warning.raw;
nvme_ctrlr_cmd_set_async_event_config(aer->ctrlr,
aer->ctrlr->async_event_config, NULL, NULL);
}
/*
* Pass the cpl data from the original async event completion,
* not the log page fetch.
*/
nvme_notify_async_consumers(aer->ctrlr, &aer->cpl,
aer->log_page_id, aer->log_page_buffer, aer->log_page_size);
}
/*
* Repost another asynchronous event request to replace the one
* that just completed.
*/
nvme_ctrlr_construct_and_submit_aer(aer->ctrlr, aer);
}
static void
nvme_ctrlr_async_event_cb(void *arg, const struct nvme_completion *cpl)
{
struct nvme_async_event_request *aer = arg;
if (nvme_completion_is_error(cpl)) {
/*
* Do not retry failed async event requests. This avoids
* infinite loops where a new async event request is submitted
* to replace the one just failed, only to fail again and
* perpetuate the loop.
*/
return;
}
/* Associated log page is in bits 23:16 of completion entry dw0. */
aer->log_page_id = (cpl->cdw0 & 0xFF0000) >> 16;
nvme_printf(aer->ctrlr, "async event occurred (log page id=0x%x)\n",
aer->log_page_id);
if (is_log_page_id_valid(aer->log_page_id)) {
aer->log_page_size = nvme_ctrlr_get_log_page_size(aer->ctrlr,
aer->log_page_id);
memcpy(&aer->cpl, cpl, sizeof(*cpl));
nvme_ctrlr_cmd_get_log_page(aer->ctrlr, aer->log_page_id,
NVME_GLOBAL_NAMESPACE_TAG, aer->log_page_buffer,
aer->log_page_size, nvme_ctrlr_async_event_log_page_cb,
aer);
/* Wait to notify consumers until after log page is fetched. */
} else {
nvme_notify_async_consumers(aer->ctrlr, cpl, aer->log_page_id,
NULL, 0);
/*
* Repost another asynchronous event request to replace the one
* that just completed.
*/
nvme_ctrlr_construct_and_submit_aer(aer->ctrlr, aer);
}
}
static void
nvme_ctrlr_construct_and_submit_aer(struct nvme_controller *ctrlr,
struct nvme_async_event_request *aer)
{
struct nvme_request *req;
aer->ctrlr = ctrlr;
req = nvme_allocate_request_null(nvme_ctrlr_async_event_cb, aer);
aer->req = req;
/*
* Disable timeout here, since asynchronous event requests should by
* nature never be timed out.
*/
req->timeout = FALSE;
req->cmd.opc = NVME_OPC_ASYNC_EVENT_REQUEST;
nvme_ctrlr_submit_admin_request(ctrlr, req);
}
static void
nvme_ctrlr_configure_aer(struct nvme_controller *ctrlr)
{
struct nvme_completion_poll_status status;
struct nvme_async_event_request *aer;
uint32_t i;
ctrlr->async_event_config.raw = 0xFF;
ctrlr->async_event_config.bits.reserved = 0;
status.done = FALSE;
nvme_ctrlr_cmd_get_feature(ctrlr, NVME_FEAT_TEMPERATURE_THRESHOLD,
0, NULL, 0, nvme_completion_poll_cb, &status);
while (status.done == FALSE)
pause("nvme", 1);
if (nvme_completion_is_error(&status.cpl) ||
(status.cpl.cdw0 & 0xFFFF) == 0xFFFF ||
(status.cpl.cdw0 & 0xFFFF) == 0x0000) {
nvme_printf(ctrlr, "temperature threshold not supported\n");
ctrlr->async_event_config.bits.temperature = 0;
}
nvme_ctrlr_cmd_set_async_event_config(ctrlr,
ctrlr->async_event_config, NULL, NULL);
/* aerl is a zero-based value, so we need to add 1 here. */
ctrlr->num_aers = min(NVME_MAX_ASYNC_EVENTS, (ctrlr->cdata.aerl+1));
/* Chatham doesn't support AERs. */
if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID)
ctrlr->num_aers = 0;
for (i = 0; i < ctrlr->num_aers; i++) {
aer = &ctrlr->aer[i];
nvme_ctrlr_construct_and_submit_aer(ctrlr, aer);
}
}
static void
nvme_ctrlr_configure_int_coalescing(struct nvme_controller *ctrlr)
{
ctrlr->int_coal_time = 0;
TUNABLE_INT_FETCH("hw.nvme.int_coal_time",
&ctrlr->int_coal_time);
ctrlr->int_coal_threshold = 0;
TUNABLE_INT_FETCH("hw.nvme.int_coal_threshold",
&ctrlr->int_coal_threshold);
nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr, ctrlr->int_coal_time,
ctrlr->int_coal_threshold, NULL, NULL);
}
static void
nvme_ctrlr_start(void *ctrlr_arg)
{
struct nvme_controller *ctrlr = ctrlr_arg;
int i;
nvme_qpair_reset(&ctrlr->adminq);
for (i = 0; i < ctrlr->num_io_queues; i++)
nvme_qpair_reset(&ctrlr->ioq[i]);
nvme_admin_qpair_enable(&ctrlr->adminq);
if (nvme_ctrlr_identify(ctrlr) != 0) {
nvme_ctrlr_fail(ctrlr);
return;
}
if (nvme_ctrlr_set_num_qpairs(ctrlr) != 0) {
nvme_ctrlr_fail(ctrlr);
return;
}
if (nvme_ctrlr_create_qpairs(ctrlr) != 0) {
nvme_ctrlr_fail(ctrlr);
return;
}
if (nvme_ctrlr_construct_namespaces(ctrlr) != 0) {
nvme_ctrlr_fail(ctrlr);
return;
}
nvme_ctrlr_configure_aer(ctrlr);
nvme_ctrlr_configure_int_coalescing(ctrlr);
for (i = 0; i < ctrlr->num_io_queues; i++)
nvme_io_qpair_enable(&ctrlr->ioq[i]);
}
void
nvme_ctrlr_start_config_hook(void *arg)
{
struct nvme_controller *ctrlr = arg;
nvme_ctrlr_start(ctrlr);
config_intrhook_disestablish(&ctrlr->config_hook);
ctrlr->is_initialized = 1;
nvme_notify_new_controller(ctrlr);
}
static void
nvme_ctrlr_reset_task(void *arg, int pending)
{
struct nvme_controller *ctrlr = arg;
int status;
nvme_printf(ctrlr, "resetting controller\n");
status = nvme_ctrlr_hw_reset(ctrlr);
/*
* Use pause instead of DELAY, so that we yield to any nvme interrupt
* handlers on this CPU that were blocked on a qpair lock. We want
* all nvme interrupts completed before proceeding with restarting the
* controller.
*
* XXX - any way to guarantee the interrupt handlers have quiesced?
*/
pause("nvmereset", hz / 10);
if (status == 0)
nvme_ctrlr_start(ctrlr);
else
nvme_ctrlr_fail(ctrlr);
atomic_cmpset_32(&ctrlr->is_resetting, 1, 0);
}
static void
nvme_ctrlr_intx_handler(void *arg)
{
struct nvme_controller *ctrlr = arg;
nvme_mmio_write_4(ctrlr, intms, 1);
nvme_qpair_process_completions(&ctrlr->adminq);
if (ctrlr->ioq[0].cpl)
nvme_qpair_process_completions(&ctrlr->ioq[0]);
nvme_mmio_write_4(ctrlr, intmc, 1);
}
static int
nvme_ctrlr_configure_intx(struct nvme_controller *ctrlr)
{
ctrlr->num_io_queues = 1;
ctrlr->per_cpu_io_queues = 0;
ctrlr->rid = 0;
ctrlr->res = bus_alloc_resource_any(ctrlr->dev, SYS_RES_IRQ,
&ctrlr->rid, RF_SHAREABLE | RF_ACTIVE);
if (ctrlr->res == NULL) {
nvme_printf(ctrlr, "unable to allocate shared IRQ\n");
return (ENOMEM);
}
bus_setup_intr(ctrlr->dev, ctrlr->res,
INTR_TYPE_MISC | INTR_MPSAFE, NULL, nvme_ctrlr_intx_handler,
ctrlr, &ctrlr->tag);
if (ctrlr->tag == NULL) {
nvme_printf(ctrlr, "unable to setup intx handler\n");
return (ENOMEM);
}
return (0);
}
static void
nvme_pt_done(void *arg, const struct nvme_completion *cpl)
{
struct nvme_pt_command *pt = arg;
bzero(&pt->cpl, sizeof(pt->cpl));
pt->cpl.cdw0 = cpl->cdw0;
pt->cpl.status = cpl->status;
pt->cpl.status.p = 0;
mtx_lock(pt->driver_lock);
wakeup(pt);
mtx_unlock(pt->driver_lock);
}
int
nvme_ctrlr_passthrough_cmd(struct nvme_controller *ctrlr,
struct nvme_pt_command *pt, uint32_t nsid, int is_user_buffer,
int is_admin_cmd)
{
struct nvme_request *req;
struct mtx *mtx;
struct buf *buf = NULL;
int ret = 0;
if (pt->len > 0) {
if (pt->len > ctrlr->max_xfer_size) {
nvme_printf(ctrlr, "pt->len (%d) "
"exceeds max_xfer_size (%d)\n", pt->len,
ctrlr->max_xfer_size);
return EIO;
}
if (is_user_buffer) {
/*
* Ensure the user buffer is wired for the duration of
* this passthrough command.
*/
PHOLD(curproc);
buf = getpbuf(NULL);
buf->b_saveaddr = buf->b_data;
buf->b_data = pt->buf;
buf->b_bufsize = pt->len;
buf->b_iocmd = pt->is_read ? BIO_READ : BIO_WRITE;
#ifdef NVME_UNMAPPED_BIO_SUPPORT
if (vmapbuf(buf, 1) < 0) {
#else
if (vmapbuf(buf) < 0) {
#endif
ret = EFAULT;
goto err;
}
req = nvme_allocate_request_vaddr(buf->b_data, pt->len,
nvme_pt_done, pt);
} else
req = nvme_allocate_request_vaddr(pt->buf, pt->len,
nvme_pt_done, pt);
} else
req = nvme_allocate_request_null(nvme_pt_done, pt);
req->cmd.opc = pt->cmd.opc;
req->cmd.cdw10 = pt->cmd.cdw10;
req->cmd.cdw11 = pt->cmd.cdw11;
req->cmd.cdw12 = pt->cmd.cdw12;
req->cmd.cdw13 = pt->cmd.cdw13;
req->cmd.cdw14 = pt->cmd.cdw14;
req->cmd.cdw15 = pt->cmd.cdw15;
req->cmd.nsid = nsid;
if (is_admin_cmd)
mtx = &ctrlr->lock;
else
mtx = &ctrlr->ns[nsid-1].lock;
mtx_lock(mtx);
pt->driver_lock = mtx;
if (is_admin_cmd)
nvme_ctrlr_submit_admin_request(ctrlr, req);
else
nvme_ctrlr_submit_io_request(ctrlr, req);
mtx_sleep(pt, mtx, PRIBIO, "nvme_pt", 0);
mtx_unlock(mtx);
pt->driver_lock = NULL;
err:
if (buf != NULL) {
relpbuf(buf, NULL);
PRELE(curproc);
}
return (ret);
}
static int
nvme_ctrlr_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int flag,
struct thread *td)
{
struct nvme_controller *ctrlr;
struct nvme_pt_command *pt;
ctrlr = cdev->si_drv1;
switch (cmd) {
case NVME_RESET_CONTROLLER:
nvme_ctrlr_reset(ctrlr);
break;
case NVME_PASSTHROUGH_CMD:
pt = (struct nvme_pt_command *)arg;
#ifdef CHATHAM2
/*
* Chatham IDENTIFY data is spoofed, so copy the spoofed data
* rather than issuing the command to the Chatham controller.
*/
if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID &&
pt->cmd.opc == NVME_OPC_IDENTIFY) {
if (pt->cmd.cdw10 == 1) {
if (pt->len != sizeof(ctrlr->cdata))
return (EINVAL);
return (copyout(&ctrlr->cdata, pt->buf,
pt->len));
} else {
if (pt->len != sizeof(ctrlr->ns[0].data) ||
pt->cmd.nsid != 1)
return (EINVAL);
return (copyout(&ctrlr->ns[0].data, pt->buf,
pt->len));
}
}
#endif
return (nvme_ctrlr_passthrough_cmd(ctrlr, pt, pt->cmd.nsid,
1 /* is_user_buffer */, 1 /* is_admin_cmd */));
default:
return (ENOTTY);
}
return (0);
}
static struct cdevsw nvme_ctrlr_cdevsw = {
.d_version = D_VERSION,
.d_flags = 0,
.d_ioctl = nvme_ctrlr_ioctl
};
int
nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
{
union cap_lo_register cap_lo;
union cap_hi_register cap_hi;
int i, num_vectors, per_cpu_io_queues, rid;
int status, timeout_period;
ctrlr->dev = dev;
mtx_init(&ctrlr->lock, "nvme ctrlr lock", NULL, MTX_DEF);
status = nvme_ctrlr_allocate_bar(ctrlr);
if (status != 0)
return (status);
#ifdef CHATHAM2
if (pci_get_devid(dev) == CHATHAM_PCI_ID) {
status = nvme_ctrlr_allocate_chatham_bar(ctrlr);
if (status != 0)
return (status);
nvme_ctrlr_setup_chatham(ctrlr);
}
#endif
/*
* Software emulators may set the doorbell stride to something
* other than zero, but this driver is not set up to handle that.
*/
cap_hi.raw = nvme_mmio_read_4(ctrlr, cap_hi);
if (cap_hi.bits.dstrd != 0)
return (ENXIO);
ctrlr->min_page_size = 1 << (12 + cap_hi.bits.mpsmin);
/* Get ready timeout value from controller, in units of 500ms. */
cap_lo.raw = nvme_mmio_read_4(ctrlr, cap_lo);
ctrlr->ready_timeout_in_ms = cap_lo.bits.to * 500;
timeout_period = NVME_DEFAULT_TIMEOUT_PERIOD;
TUNABLE_INT_FETCH("hw.nvme.timeout_period", &timeout_period);
timeout_period = min(timeout_period, NVME_MAX_TIMEOUT_PERIOD);
timeout_period = max(timeout_period, NVME_MIN_TIMEOUT_PERIOD);
ctrlr->timeout_period = timeout_period;
nvme_retry_count = NVME_DEFAULT_RETRY_COUNT;
TUNABLE_INT_FETCH("hw.nvme.retry_count", &nvme_retry_count);
per_cpu_io_queues = 1;
TUNABLE_INT_FETCH("hw.nvme.per_cpu_io_queues", &per_cpu_io_queues);
ctrlr->per_cpu_io_queues = per_cpu_io_queues ? TRUE : FALSE;
if (ctrlr->per_cpu_io_queues)
ctrlr->num_io_queues = mp_ncpus;
else
ctrlr->num_io_queues = 1;
ctrlr->force_intx = 0;
TUNABLE_INT_FETCH("hw.nvme.force_intx", &ctrlr->force_intx);
ctrlr->enable_aborts = 0;
TUNABLE_INT_FETCH("hw.nvme.enable_aborts", &ctrlr->enable_aborts);
ctrlr->msix_enabled = 1;
if (ctrlr->force_intx) {
ctrlr->msix_enabled = 0;
goto intx;
}
/* One vector per IO queue, plus one vector for admin queue. */
num_vectors = ctrlr->num_io_queues + 1;
if (pci_msix_count(dev) < num_vectors) {
ctrlr->msix_enabled = 0;
goto intx;
}
if (pci_alloc_msix(dev, &num_vectors) != 0) {
ctrlr->msix_enabled = 0;
goto intx;
}
/*
* On earlier FreeBSD releases, there are reports that
* pci_alloc_msix() can return successfully with all vectors
* requested, but a subsequent bus_alloc_resource_any()
* for one of those vectors fails. This issue occurs more
* readily with multiple devices using per-CPU vectors.
* To workaround this issue, try to allocate the resources now,
* and fall back to INTx if we cannot allocate all of them.
* This issue cannot be reproduced on more recent versions of
* FreeBSD which have increased the maximum number of MSI-X
* vectors, but adding the workaround makes it easier for
* vendors wishing to import this driver into kernels based on
* older versions of FreeBSD.
*/
for (i = 0; i < num_vectors; i++) {
rid = i + 1;
ctrlr->msi_res[i] = bus_alloc_resource_any(ctrlr->dev,
SYS_RES_IRQ, &rid, RF_ACTIVE);
if (ctrlr->msi_res[i] == NULL) {
ctrlr->msix_enabled = 0;
while (i > 0) {
i--;
bus_release_resource(ctrlr->dev,
SYS_RES_IRQ,
rman_get_rid(ctrlr->msi_res[i]),
ctrlr->msi_res[i]);
}
pci_release_msi(dev);
nvme_printf(ctrlr, "could not obtain all MSI-X "
"resources, reverting to intx\n");
break;
}
}
intx:
if (!ctrlr->msix_enabled)
nvme_ctrlr_configure_intx(ctrlr);
ctrlr->max_xfer_size = NVME_MAX_XFER_SIZE;
nvme_ctrlr_construct_admin_qpair(ctrlr);
status = nvme_ctrlr_construct_io_qpairs(ctrlr);
if (status != 0)
return (status);
ctrlr->cdev = make_dev(&nvme_ctrlr_cdevsw, device_get_unit(dev),
UID_ROOT, GID_WHEEL, 0600, "nvme%d", device_get_unit(dev));
if (ctrlr->cdev == NULL)
return (ENXIO);
ctrlr->cdev->si_drv1 = (void *)ctrlr;
ctrlr->taskqueue = taskqueue_create("nvme_taskq", M_WAITOK,
taskqueue_thread_enqueue, &ctrlr->taskqueue);
taskqueue_start_threads(&ctrlr->taskqueue, 1, PI_DISK, "nvme taskq");
ctrlr->is_resetting = 0;
ctrlr->is_initialized = 0;
ctrlr->notification_sent = 0;
TASK_INIT(&ctrlr->reset_task, 0, nvme_ctrlr_reset_task, ctrlr);
TASK_INIT(&ctrlr->fail_req_task, 0, nvme_ctrlr_fail_req_task, ctrlr);
STAILQ_INIT(&ctrlr->fail_req);
ctrlr->is_failed = FALSE;
return (0);
}
void
nvme_ctrlr_destruct(struct nvme_controller *ctrlr, device_t dev)
{
int i;
/*
* Notify the controller of a shutdown, even though this is due to
* a driver unload, not a system shutdown (this path is not invoked
* during shutdown). This ensures the controller receives a
* shutdown notification in case the system is shutdown before
* reloading the driver.
*
* Chatham does not let you re-enable the controller after shutdown
* notification has been received, so do not send it in this case.
* This is OK because Chatham does not depend on the shutdown
* notification anyways.
*/
if (pci_get_devid(ctrlr->dev) != CHATHAM_PCI_ID)
nvme_ctrlr_shutdown(ctrlr);
nvme_ctrlr_disable(ctrlr);
taskqueue_free(ctrlr->taskqueue);
for (i = 0; i < NVME_MAX_NAMESPACES; i++)
nvme_ns_destruct(&ctrlr->ns[i]);
if (ctrlr->cdev)
destroy_dev(ctrlr->cdev);
for (i = 0; i < ctrlr->num_io_queues; i++) {
nvme_io_qpair_destroy(&ctrlr->ioq[i]);
}
free(ctrlr->ioq, M_NVME);
nvme_admin_qpair_destroy(&ctrlr->adminq);
if (ctrlr->resource != NULL) {
bus_release_resource(dev, SYS_RES_MEMORY,
ctrlr->resource_id, ctrlr->resource);
}
if (ctrlr->bar4_resource != NULL) {
bus_release_resource(dev, SYS_RES_MEMORY,
ctrlr->bar4_resource_id, ctrlr->bar4_resource);
}
#ifdef CHATHAM2
if (ctrlr->chatham_resource != NULL) {
bus_release_resource(dev, SYS_RES_MEMORY,
ctrlr->chatham_resource_id, ctrlr->chatham_resource);
}
#endif
if (ctrlr->tag)
bus_teardown_intr(ctrlr->dev, ctrlr->res, ctrlr->tag);
if (ctrlr->res)
bus_release_resource(ctrlr->dev, SYS_RES_IRQ,
rman_get_rid(ctrlr->res), ctrlr->res);
if (ctrlr->msix_enabled)
pci_release_msi(dev);
}
void
nvme_ctrlr_shutdown(struct nvme_controller *ctrlr)
{
union cc_register cc;
union csts_register csts;
int ticks = 0;
cc.raw = nvme_mmio_read_4(ctrlr, cc);
cc.bits.shn = NVME_SHN_NORMAL;
nvme_mmio_write_4(ctrlr, cc, cc.raw);
csts.raw = nvme_mmio_read_4(ctrlr, csts);
while ((csts.bits.shst != NVME_SHST_COMPLETE) && (ticks++ < 5*hz)) {
pause("nvme shn", 1);
csts.raw = nvme_mmio_read_4(ctrlr, csts);
}
if (csts.bits.shst != NVME_SHST_COMPLETE)
nvme_printf(ctrlr, "did not complete shutdown within 5 seconds "
"of notification\n");
}
void
nvme_ctrlr_submit_admin_request(struct nvme_controller *ctrlr,
struct nvme_request *req)
{
nvme_qpair_submit_request(&ctrlr->adminq, req);
}
void
nvme_ctrlr_submit_io_request(struct nvme_controller *ctrlr,
struct nvme_request *req)
{
struct nvme_qpair *qpair;
if (ctrlr->per_cpu_io_queues)
qpair = &ctrlr->ioq[curcpu];
else
qpair = &ctrlr->ioq[0];
nvme_qpair_submit_request(qpair, req);
}
device_t
nvme_ctrlr_get_device(struct nvme_controller *ctrlr)
{
return (ctrlr->dev);
}
const struct nvme_controller_data *
nvme_ctrlr_get_data(struct nvme_controller *ctrlr)
{
return (&ctrlr->cdata);
}
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