2 * Copyright (C) 2012-2013 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("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/module.h>
35 #include <sys/systm.h>
36 #include <sys/taskqueue.h>
38 #include <geom/geom.h>
39 #include <geom/geom_disk.h>
41 #include <dev/nvme/nvme.h>
47 static disk_ioctl_t nvd_ioctl;
48 static disk_strategy_t nvd_strategy;
50 static void nvd_done(void *arg, const struct nvme_completion *cpl);
52 static void *nvd_new_disk(struct nvme_namespace *ns, void *ctrlr);
53 static void destroy_geom_disk(struct nvd_disk *ndisk);
55 static void *nvd_new_controller(struct nvme_controller *ctrlr);
56 static void nvd_controller_fail(void *ctrlr);
58 static int nvd_load(void);
59 static void nvd_unload(void);
61 MALLOC_DEFINE(M_NVD, "nvd", "nvd(4) allocations");
63 struct nvme_consumer *consumer_handle;
67 struct bio_queue_head bioq;
73 struct nvme_namespace *ns;
76 uint32_t ordered_in_flight;
78 TAILQ_ENTRY(nvd_disk) global_tailq;
79 TAILQ_ENTRY(nvd_disk) ctrlr_tailq;
82 struct nvd_controller {
84 TAILQ_ENTRY(nvd_controller) tailq;
85 TAILQ_HEAD(, nvd_disk) disk_head;
88 static TAILQ_HEAD(, nvd_controller) ctrlr_head;
89 static TAILQ_HEAD(disk_list, nvd_disk) disk_head;
91 static int nvd_modevent(module_t mod, int type, void *arg)
109 moduledata_t nvd_mod = {
111 (modeventhand_t)nvd_modevent,
115 DECLARE_MODULE(nvd, nvd_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
116 MODULE_VERSION(nvd, 1);
117 MODULE_DEPEND(nvd, nvme, 1, 1, 1);
123 TAILQ_INIT(&ctrlr_head);
124 TAILQ_INIT(&disk_head);
126 consumer_handle = nvme_register_consumer(nvd_new_disk,
127 nvd_new_controller, NULL, nvd_controller_fail);
129 return (consumer_handle != NULL ? 0 : -1);
135 struct nvd_controller *ctrlr;
136 struct nvd_disk *disk;
138 while (!TAILQ_EMPTY(&ctrlr_head)) {
139 ctrlr = TAILQ_FIRST(&ctrlr_head);
140 TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq);
144 while (!TAILQ_EMPTY(&disk_head)) {
145 disk = TAILQ_FIRST(&disk_head);
146 TAILQ_REMOVE(&disk_head, disk, global_tailq);
147 destroy_geom_disk(disk);
151 nvme_unregister_consumer(consumer_handle);
155 nvd_bio_submit(struct nvd_disk *ndisk, struct bio *bp)
159 bp->bio_driver1 = NULL;
160 atomic_add_int(&ndisk->cur_depth, 1);
161 err = nvme_ns_bio_process(ndisk->ns, bp, nvd_done);
163 atomic_add_int(&ndisk->cur_depth, -1);
164 if (__predict_false(bp->bio_flags & BIO_ORDERED))
165 atomic_add_int(&ndisk->ordered_in_flight, -1);
167 bp->bio_flags |= BIO_ERROR;
168 bp->bio_resid = bp->bio_bcount;
177 nvd_strategy(struct bio *bp)
179 struct nvd_disk *ndisk;
181 ndisk = (struct nvd_disk *)bp->bio_disk->d_drv1;
183 if (__predict_false(bp->bio_flags & BIO_ORDERED))
184 atomic_add_int(&ndisk->ordered_in_flight, 1);
186 if (__predict_true(ndisk->ordered_in_flight == 0)) {
187 nvd_bio_submit(ndisk, bp);
192 * There are ordered bios in flight, so we need to submit
193 * bios through the task queue to enforce ordering.
195 mtx_lock(&ndisk->bioqlock);
196 bioq_insert_tail(&ndisk->bioq, bp);
197 mtx_unlock(&ndisk->bioqlock);
198 taskqueue_enqueue(ndisk->tq, &ndisk->bioqtask);
202 nvd_ioctl(struct disk *ndisk, u_long cmd, void *data, int fflag,
216 nvd_done(void *arg, const struct nvme_completion *cpl)
219 struct nvd_disk *ndisk;
221 bp = (struct bio *)arg;
223 ndisk = bp->bio_disk->d_drv1;
225 atomic_add_int(&ndisk->cur_depth, -1);
226 if (__predict_false(bp->bio_flags & BIO_ORDERED))
227 atomic_add_int(&ndisk->ordered_in_flight, -1);
233 nvd_bioq_process(void *arg, int pending)
235 struct nvd_disk *ndisk = arg;
239 mtx_lock(&ndisk->bioqlock);
240 bp = bioq_takefirst(&ndisk->bioq);
241 mtx_unlock(&ndisk->bioqlock);
245 if (nvd_bio_submit(ndisk, bp) != 0) {
251 * BIO_ORDERED flag dictates that the bio with BIO_ORDERED
252 * flag set must be completed before proceeding with
255 if (bp->bio_flags & BIO_ORDERED) {
256 while (ndisk->cur_depth > 0) {
257 pause("nvd flush", 1);
265 nvd_new_controller(struct nvme_controller *ctrlr)
267 struct nvd_controller *nvd_ctrlr;
269 nvd_ctrlr = malloc(sizeof(struct nvd_controller), M_NVD,
272 TAILQ_INIT(&nvd_ctrlr->disk_head);
273 TAILQ_INSERT_TAIL(&ctrlr_head, nvd_ctrlr, tailq);
279 nvd_new_disk(struct nvme_namespace *ns, void *ctrlr_arg)
281 uint8_t descr[NVME_MODEL_NUMBER_LENGTH+1];
282 struct nvd_disk *ndisk;
284 struct nvd_controller *ctrlr = ctrlr_arg;
286 ndisk = malloc(sizeof(struct nvd_disk), M_NVD, M_ZERO | M_WAITOK);
289 disk->d_strategy = nvd_strategy;
290 disk->d_ioctl = nvd_ioctl;
291 disk->d_name = NVD_STR;
292 disk->d_drv1 = ndisk;
294 disk->d_maxsize = nvme_ns_get_max_io_xfer_size(ns);
295 disk->d_sectorsize = nvme_ns_get_sector_size(ns);
296 disk->d_mediasize = (off_t)nvme_ns_get_size(ns);
297 disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns);
298 disk->d_stripesize = nvme_ns_get_optimal_sector_size(ns);
300 if (TAILQ_EMPTY(&disk_head))
304 TAILQ_LAST(&disk_head, disk_list)->disk->d_unit + 1;
306 disk->d_flags = DISKFLAG_DIRECT_COMPLETION;
308 if (nvme_ns_get_flags(ns) & NVME_NS_DEALLOCATE_SUPPORTED)
309 disk->d_flags |= DISKFLAG_CANDELETE;
311 if (nvme_ns_get_flags(ns) & NVME_NS_FLUSH_SUPPORTED)
312 disk->d_flags |= DISKFLAG_CANFLUSHCACHE;
314 /* ifdef used here to ease porting to stable branches at a later point. */
315 #ifdef DISKFLAG_UNMAPPED_BIO
316 disk->d_flags |= DISKFLAG_UNMAPPED_BIO;
320 * d_ident and d_descr are both far bigger than the length of either
321 * the serial or model number strings.
323 nvme_strvis(disk->d_ident, nvme_ns_get_serial_number(ns),
324 sizeof(disk->d_ident), NVME_SERIAL_NUMBER_LENGTH);
326 nvme_strvis(descr, nvme_ns_get_model_number(ns), sizeof(descr),
327 NVME_MODEL_NUMBER_LENGTH);
329 #if __FreeBSD_version >= 900034
330 strlcpy(disk->d_descr, descr, sizeof(descr));
335 ndisk->cur_depth = 0;
336 ndisk->ordered_in_flight = 0;
338 mtx_init(&ndisk->bioqlock, "NVD bioq lock", NULL, MTX_DEF);
339 bioq_init(&ndisk->bioq);
341 TASK_INIT(&ndisk->bioqtask, 0, nvd_bioq_process, ndisk);
342 ndisk->tq = taskqueue_create("nvd_taskq", M_WAITOK,
343 taskqueue_thread_enqueue, &ndisk->tq);
344 taskqueue_start_threads(&ndisk->tq, 1, PI_DISK, "nvd taskq");
346 TAILQ_INSERT_TAIL(&disk_head, ndisk, global_tailq);
347 TAILQ_INSERT_TAIL(&ctrlr->disk_head, ndisk, ctrlr_tailq);
349 disk_create(disk, DISK_VERSION);
351 printf(NVD_STR"%u: <%s> NVMe namespace\n", disk->d_unit, descr);
352 printf(NVD_STR"%u: %juMB (%ju %u byte sectors)\n", disk->d_unit,
353 (uintmax_t)disk->d_mediasize / (1024*1024),
354 (uintmax_t)disk->d_mediasize / disk->d_sectorsize,
361 destroy_geom_disk(struct nvd_disk *ndisk)
370 taskqueue_free(ndisk->tq);
372 disk_destroy(ndisk->disk);
374 mtx_lock(&ndisk->bioqlock);
376 bp = bioq_takefirst(&ndisk->bioq);
380 bp->bio_flags |= BIO_ERROR;
381 bp->bio_resid = bp->bio_bcount;
386 printf(NVD_STR"%u: lost device - %d outstanding\n", unit, cnt);
387 printf(NVD_STR"%u: removing device entry\n", unit);
389 mtx_unlock(&ndisk->bioqlock);
391 mtx_destroy(&ndisk->bioqlock);
395 nvd_controller_fail(void *ctrlr_arg)
397 struct nvd_controller *ctrlr = ctrlr_arg;
398 struct nvd_disk *disk;
400 while (!TAILQ_EMPTY(&ctrlr->disk_head)) {
401 disk = TAILQ_FIRST(&ctrlr->disk_head);
402 TAILQ_REMOVE(&disk_head, disk, global_tailq);
403 TAILQ_REMOVE(&ctrlr->disk_head, disk, ctrlr_tailq);
404 destroy_geom_disk(disk);
408 TAILQ_REMOVE(&ctrlr_head, ctrlr, tailq);