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