1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/vmalloc.h>
5 #define CREATE_TRACE_POINTS
6 #include "null_blk_trace.h"
8 /* zone_size in MBs to sectors. */
9 #define ZONE_SIZE_SHIFT 11
11 static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
13 return sect >> ilog2(dev->zone_size_sects);
16 int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
18 sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
22 if (!is_power_of_2(dev->zone_size)) {
23 pr_err("zone_size must be power-of-two\n");
26 if (dev->zone_size > dev->size) {
27 pr_err("Zone size larger than device capacity\n");
31 dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
32 dev->nr_zones = dev_size >>
33 (SECTOR_SHIFT + ilog2(dev->zone_size_sects));
34 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
35 GFP_KERNEL | __GFP_ZERO);
39 if (dev->zone_nr_conv >= dev->nr_zones) {
40 dev->zone_nr_conv = dev->nr_zones - 1;
41 pr_info("changed the number of conventional zones to %u",
45 for (i = 0; i < dev->zone_nr_conv; i++) {
46 struct blk_zone *zone = &dev->zones[i];
49 zone->len = dev->zone_size_sects;
50 zone->wp = zone->start + zone->len;
51 zone->type = BLK_ZONE_TYPE_CONVENTIONAL;
52 zone->cond = BLK_ZONE_COND_NOT_WP;
54 sector += dev->zone_size_sects;
57 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {
58 struct blk_zone *zone = &dev->zones[i];
60 zone->start = zone->wp = sector;
61 zone->len = dev->zone_size_sects;
62 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
63 zone->cond = BLK_ZONE_COND_EMPTY;
65 sector += dev->zone_size_sects;
68 q->limits.zoned = BLK_ZONED_HM;
69 blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
70 blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
75 int null_register_zoned_dev(struct nullb *nullb)
77 struct nullb_device *dev = nullb->dev;
78 struct request_queue *q = nullb->q;
81 int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
86 blk_queue_chunk_sectors(q, dev->zone_size_sects);
87 q->nr_zones = blkdev_nr_zones(nullb->disk);
90 blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
95 void null_free_zoned_dev(struct nullb_device *dev)
100 int null_report_zones(struct gendisk *disk, sector_t sector,
101 unsigned int nr_zones, report_zones_cb cb, void *data)
103 struct nullb *nullb = disk->private_data;
104 struct nullb_device *dev = nullb->dev;
105 unsigned int first_zone, i;
106 struct blk_zone zone;
109 first_zone = null_zone_no(dev, sector);
110 if (first_zone >= dev->nr_zones)
113 nr_zones = min(nr_zones, dev->nr_zones - first_zone);
114 trace_nullb_report_zones(nullb, nr_zones);
116 for (i = 0; i < nr_zones; i++) {
118 * Stacked DM target drivers will remap the zone information by
119 * modifying the zone information passed to the report callback.
120 * So use a local copy to avoid corruption of the device zone
123 memcpy(&zone, &dev->zones[first_zone + i],
124 sizeof(struct blk_zone));
125 error = cb(&zone, i, data);
133 size_t null_zone_valid_read_len(struct nullb *nullb,
134 sector_t sector, unsigned int len)
136 struct nullb_device *dev = nullb->dev;
137 struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
138 unsigned int nr_sectors = len >> SECTOR_SHIFT;
140 /* Read must be below the write pointer position */
141 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL ||
142 sector + nr_sectors <= zone->wp)
145 if (sector > zone->wp)
148 return (zone->wp - sector) << SECTOR_SHIFT;
151 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
152 unsigned int nr_sectors, bool append)
154 struct nullb_device *dev = cmd->nq->dev;
155 unsigned int zno = null_zone_no(dev, sector);
156 struct blk_zone *zone = &dev->zones[zno];
159 trace_nullb_zone_op(cmd, zno, zone->cond);
161 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
162 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
164 switch (zone->cond) {
165 case BLK_ZONE_COND_FULL:
166 /* Cannot write to a full zone */
167 return BLK_STS_IOERR;
168 case BLK_ZONE_COND_EMPTY:
169 case BLK_ZONE_COND_IMP_OPEN:
170 case BLK_ZONE_COND_EXP_OPEN:
171 case BLK_ZONE_COND_CLOSED:
173 * Regular writes must be at the write pointer position.
174 * Zone append writes are automatically issued at the write
175 * pointer and the position returned using the request or BIO
181 cmd->bio->bi_iter.bi_sector = sector;
183 cmd->rq->__sector = sector;
184 } else if (sector != zone->wp) {
185 return BLK_STS_IOERR;
188 if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
189 zone->cond = BLK_ZONE_COND_IMP_OPEN;
191 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors);
192 if (ret != BLK_STS_OK)
195 zone->wp += nr_sectors;
196 if (zone->wp == zone->start + zone->len)
197 zone->cond = BLK_ZONE_COND_FULL;
200 /* Invalid zone condition */
201 return BLK_STS_IOERR;
205 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
208 struct nullb_device *dev = cmd->nq->dev;
209 unsigned int zone_no = null_zone_no(dev, sector);
210 struct blk_zone *zone = &dev->zones[zone_no];
214 case REQ_OP_ZONE_RESET_ALL:
215 for (i = 0; i < dev->nr_zones; i++) {
216 if (zone[i].type == BLK_ZONE_TYPE_CONVENTIONAL)
218 zone[i].cond = BLK_ZONE_COND_EMPTY;
219 zone[i].wp = zone[i].start;
222 case REQ_OP_ZONE_RESET:
223 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
224 return BLK_STS_IOERR;
226 zone->cond = BLK_ZONE_COND_EMPTY;
227 zone->wp = zone->start;
229 case REQ_OP_ZONE_OPEN:
230 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
231 return BLK_STS_IOERR;
232 if (zone->cond == BLK_ZONE_COND_FULL)
233 return BLK_STS_IOERR;
235 zone->cond = BLK_ZONE_COND_EXP_OPEN;
237 case REQ_OP_ZONE_CLOSE:
238 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
239 return BLK_STS_IOERR;
240 if (zone->cond == BLK_ZONE_COND_FULL)
241 return BLK_STS_IOERR;
243 if (zone->wp == zone->start)
244 zone->cond = BLK_ZONE_COND_EMPTY;
246 zone->cond = BLK_ZONE_COND_CLOSED;
248 case REQ_OP_ZONE_FINISH:
249 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
250 return BLK_STS_IOERR;
252 zone->cond = BLK_ZONE_COND_FULL;
253 zone->wp = zone->start + zone->len;
256 return BLK_STS_NOTSUPP;
259 trace_nullb_zone_op(cmd, zone_no, zone->cond);
263 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op,
264 sector_t sector, sector_t nr_sectors)
268 return null_zone_write(cmd, sector, nr_sectors, false);
269 case REQ_OP_ZONE_APPEND:
270 return null_zone_write(cmd, sector, nr_sectors, true);
271 case REQ_OP_ZONE_RESET:
272 case REQ_OP_ZONE_RESET_ALL:
273 case REQ_OP_ZONE_OPEN:
274 case REQ_OP_ZONE_CLOSE:
275 case REQ_OP_ZONE_FINISH:
276 return null_zone_mgmt(cmd, op, sector);
278 return null_process_cmd(cmd, op, sector, nr_sectors);