drivers/nvme/host/zns.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
   4  */
   5
   6 #include <linux/blkdev.h>
   7 #include <linux/vmalloc.h>
   8 #include "nvme.h"
   9
  10 int nvme_revalidate_zones(struct nvme_ns *ns)
  11 {
  12         struct request_queue *q = ns->queue;
  13         int ret;
  14
  15         ret = blk_revalidate_disk_zones(ns->disk, NULL);
  16         if (!ret)
  17                 blk_queue_max_zone_append_sectors(q, ns->ctrl->max_zone_append);
  18         return ret;
  19 }
  20
  21 static int nvme_set_max_append(struct nvme_ctrl *ctrl)
  22 {
  23         struct nvme_command c = { };
  24         struct nvme_id_ctrl_zns *id;
  25         int status;
  26
  27         id = kzalloc(sizeof(*id), GFP_KERNEL);
  28         if (!id)
  29                 return -ENOMEM;
  30
  31         c.identify.opcode = nvme_admin_identify;
  32         c.identify.cns = NVME_ID_CNS_CS_CTRL;
  33         c.identify.csi = NVME_CSI_ZNS;
  34
  35         status = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
  36         if (status) {
  37                 kfree(id);
  38                 return status;
  39         }
  40
  41         if (id->zasl)
  42                 ctrl->max_zone_append = 1 << (id->zasl + 3);
  43         else
  44                 ctrl->max_zone_append = ctrl->max_hw_sectors;
  45         kfree(id);
  46         return 0;
  47 }
  48
  49 int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
  50 {
  51         struct nvme_effects_log *log = ns->head->effects;
  52         struct request_queue *q = ns->queue;
  53         struct nvme_command c = { };
  54         struct nvme_id_ns_zns *id;
  55         int status;
  56
  57         /* Driver requires zone append support */
  58         if ((le32_to_cpu(log->iocs[nvme_cmd_zone_append]) &
  59                         NVME_CMD_EFFECTS_CSUPP)) {
  60                 if (test_and_clear_bit(NVME_NS_FORCE_RO, &ns->flags))
  61                         dev_warn(ns->ctrl->device,
  62                                  "Zone Append supported for zoned namespace:%d. Remove read-only mode\n",
  63                                  ns->head->ns_id);
  64         } else {
  65                 set_bit(NVME_NS_FORCE_RO, &ns->flags);
  66                 dev_warn(ns->ctrl->device,
  67                          "Zone Append not supported for zoned namespace:%d. Forcing to read-only mode\n",
  68                          ns->head->ns_id);
  69         }
  70
  71         /* Lazily query controller append limit for the first zoned namespace */
  72         if (!ns->ctrl->max_zone_append) {
  73                 status = nvme_set_max_append(ns->ctrl);
  74                 if (status)
  75                         return status;
  76         }
  77
  78         id = kzalloc(sizeof(*id), GFP_KERNEL);
  79         if (!id)
  80                 return -ENOMEM;
  81
  82         c.identify.opcode = nvme_admin_identify;
  83         c.identify.nsid = cpu_to_le32(ns->head->ns_id);
  84         c.identify.cns = NVME_ID_CNS_CS_NS;
  85         c.identify.csi = NVME_CSI_ZNS;
  86
  87         status = nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, id, sizeof(*id));
  88         if (status)
  89                 goto free_data;
  90
  91         /*
  92          * We currently do not handle devices requiring any of the zoned
  93          * operation characteristics.
  94          */
  95         if (id->zoc) {
  96                 dev_warn(ns->ctrl->device,
  97                         "zone operations:%x not supported for namespace:%u\n",
  98                         le16_to_cpu(id->zoc), ns->head->ns_id);
  99                 status = -EINVAL;
 100                 goto free_data;
 101         }
 102
 103         ns->zsze = nvme_lba_to_sect(ns, le64_to_cpu(id->lbafe[lbaf].zsze));
 104         if (!is_power_of_2(ns->zsze)) {
 105                 dev_warn(ns->ctrl->device,
 106                         "invalid zone size:%llu for namespace:%u\n",
 107                         ns->zsze, ns->head->ns_id);
 108                 status = -EINVAL;
 109                 goto free_data;
 110         }
 111
 112         q->limits.zoned = BLK_ZONED_HM;
 113         blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
 114         blk_queue_max_open_zones(q, le32_to_cpu(id->mor) + 1);
 115         blk_queue_max_active_zones(q, le32_to_cpu(id->mar) + 1);
 116 free_data:
 117         kfree(id);
 118         return status;
 119 }
 120
 121 static void *nvme_zns_alloc_report_buffer(struct nvme_ns *ns,
 122                                           unsigned int nr_zones, size_t *buflen)
 123 {
 124         struct request_queue *q = ns->disk->queue;
 125         size_t bufsize;
 126         void *buf;
 127
 128         const size_t min_bufsize = sizeof(struct nvme_zone_report) +
 129                                    sizeof(struct nvme_zone_descriptor);
 130
 131         nr_zones = min_t(unsigned int, nr_zones,
 132                          get_capacity(ns->disk) >> ilog2(ns->zsze));
 133
 134         bufsize = sizeof(struct nvme_zone_report) +
 135                 nr_zones * sizeof(struct nvme_zone_descriptor);
 136         bufsize = min_t(size_t, bufsize,
 137                         queue_max_hw_sectors(q) << SECTOR_SHIFT);
 138         bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
 139
 140         while (bufsize >= min_bufsize) {
 141                 buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
 142                 if (buf) {
 143                         *buflen = bufsize;
 144                         return buf;
 145                 }
 146                 bufsize >>= 1;
 147         }
 148         return NULL;
 149 }
 150
 151 static int nvme_zone_parse_entry(struct nvme_ns *ns,
 152                                  struct nvme_zone_descriptor *entry,
 153                                  unsigned int idx, report_zones_cb cb,
 154                                  void *data)
 155 {
 156         struct blk_zone zone = { };
 157
 158         if ((entry->zt & 0xf) != NVME_ZONE_TYPE_SEQWRITE_REQ) {
 159                 dev_err(ns->ctrl->device, "invalid zone type %#x\n",
 160                                 entry->zt);
 161                 return -EINVAL;
 162         }
 163
 164         zone.type = BLK_ZONE_TYPE_SEQWRITE_REQ;
 165         zone.cond = entry->zs >> 4;
 166         zone.len = ns->zsze;
 167         zone.capacity = nvme_lba_to_sect(ns, le64_to_cpu(entry->zcap));
 168         zone.start = nvme_lba_to_sect(ns, le64_to_cpu(entry->zslba));
 169         zone.wp = nvme_lba_to_sect(ns, le64_to_cpu(entry->wp));
 170
 171         return cb(&zone, idx, data);
 172 }
 173
 174 static int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
 175                         unsigned int nr_zones, report_zones_cb cb, void *data)
 176 {
 177         struct nvme_zone_report *report;
 178         struct nvme_command c = { };
 179         int ret, zone_idx = 0;
 180         unsigned int nz, i;
 181         size_t buflen;
 182
 183         report = nvme_zns_alloc_report_buffer(ns, nr_zones, &buflen);
 184         if (!report)
 185                 return -ENOMEM;
 186
 187         c.zmr.opcode = nvme_cmd_zone_mgmt_recv;
 188         c.zmr.nsid = cpu_to_le32(ns->head->ns_id);
 189         c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
 190         c.zmr.zra = NVME_ZRA_ZONE_REPORT;
 191         c.zmr.zrasf = NVME_ZRASF_ZONE_REPORT_ALL;
 192         c.zmr.pr = NVME_REPORT_ZONE_PARTIAL;
 193
 194         sector &= ~(ns->zsze - 1);
 195         while (zone_idx < nr_zones && sector < get_capacity(ns->disk)) {
 196                 memset(report, 0, buflen);
 197
 198                 c.zmr.slba = cpu_to_le64(nvme_sect_to_lba(ns, sector));
 199                 ret = nvme_submit_sync_cmd(ns->queue, &c, report, buflen);
 200                 if (ret) {
 201                         if (ret > 0)
 202                                 ret = -EIO;
 203                         goto out_free;
 204                 }
 205
 206                 nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
 207                 if (!nz)
 208                         break;
 209
 210                 for (i = 0; i < nz && zone_idx < nr_zones; i++) {
 211                         ret = nvme_zone_parse_entry(ns, &report->entries[i],
 212                                                     zone_idx, cb, data);
 213                         if (ret)
 214                                 goto out_free;
 215                         zone_idx++;
 216                 }
 217
 218                 sector += ns->zsze * nz;
 219         }
 220
 221         if (zone_idx > 0)
 222                 ret = zone_idx;
 223         else
 224                 ret = -EINVAL;
 225 out_free:
 226         kvfree(report);
 227         return ret;
 228 }
 229
 230 int nvme_report_zones(struct gendisk *disk, sector_t sector,
 231                       unsigned int nr_zones, report_zones_cb cb, void *data)
 232 {
 233         struct nvme_ns_head *head = NULL;
 234         struct nvme_ns *ns;
 235         int srcu_idx, ret;
 236
 237         ns = nvme_get_ns_from_disk(disk, &head, &srcu_idx);
 238         if (unlikely(!ns))
 239                 return -EWOULDBLOCK;
 240
 241         if (ns->head->ids.csi == NVME_CSI_ZNS)
 242                 ret = nvme_ns_report_zones(ns, sector, nr_zones, cb, data);
 243         else
 244                 ret = -EINVAL;
 245         nvme_put_ns_from_disk(head, srcu_idx);
 246
 247         return ret;
 248 }
 249
 250 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
 251                 struct nvme_command *c, enum nvme_zone_mgmt_action action)
 252 {
 253         c->zms.opcode = nvme_cmd_zone_mgmt_send;
 254         c->zms.nsid = cpu_to_le32(ns->head->ns_id);
 255         c->zms.slba = cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
 256         c->zms.zsa = action;
 257
 258         if (req_op(req) == REQ_OP_ZONE_RESET_ALL)
 259                 c->zms.select_all = 1;
 260
 261         return BLK_STS_OK;
 262 }