LCOV - code coverage report
Current view: top level - lib/ftl/nvc - ftl_nvc_bdev_vss.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 0 49 0.0 %
Date: 2024-07-15 02:54:26 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright 2023 Solidigm All Rights Reserved
       3             :  */
       4             : 
       5             : #include "ftl_nvc_dev.h"
       6             : #include "ftl_core.h"
       7             : #include "ftl_layout.h"
       8             : #include "utils/ftl_layout_tracker_bdev.h"
       9             : 
      10             : static bool
      11           0 : is_bdev_compatible(struct spdk_ftl_dev *dev, struct spdk_bdev *bdev)
      12             : {
      13           0 :         if (!spdk_bdev_is_md_separate(bdev)) {
      14             :                 /* It doesn't support separate metadata buffer IO */
      15           0 :                 return false;
      16             :         }
      17             : 
      18           0 :         if (spdk_bdev_get_md_size(bdev) != sizeof(union ftl_md_vss)) {
      19             :                 /* Bdev's metadata is invalid size */
      20           0 :                 return false;
      21             :         }
      22             : 
      23           0 :         if (spdk_bdev_get_dif_type(bdev) != SPDK_DIF_DISABLE) {
      24             :                 /* Unsupported DIF type used by bdev */
      25           0 :                 return false;
      26             :         }
      27             : 
      28           0 :         if (ftl_md_xfer_blocks(dev) * spdk_bdev_get_md_size(bdev) > FTL_ZERO_BUFFER_SIZE) {
      29           0 :                 FTL_ERRLOG(dev, "Zero buffer too small for bdev %s metadata transfer\n",
      30             :                            spdk_bdev_get_name(bdev));
      31           0 :                 return false;
      32             :         }
      33             : 
      34           0 :         return true;
      35             : }
      36             : 
      37             : static void
      38           0 : md_region_setup(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type,
      39             :                 struct ftl_layout_region *region)
      40             : {
      41           0 :         assert(region);
      42           0 :         region->type = reg_type;
      43           0 :         region->mirror_type = FTL_LAYOUT_REGION_TYPE_INVALID;
      44           0 :         region->name = ftl_md_region_name(reg_type);
      45             : 
      46           0 :         region->bdev_desc = dev->nv_cache.bdev_desc;
      47           0 :         region->ioch = dev->nv_cache.cache_ioch;
      48           0 :         region->vss_blksz = dev->nv_cache.md_size;
      49           0 : }
      50             : 
      51             : static int
      52           0 : md_region_create(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type,
      53             :                  uint32_t reg_version, size_t reg_blks)
      54             : {
      55             :         const struct ftl_layout_tracker_bdev_region_props *reg_props;
      56             : 
      57           0 :         assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX);
      58           0 :         reg_blks = ftl_md_region_align_blocks(dev, reg_blks);
      59             : 
      60           0 :         reg_props = ftl_layout_tracker_bdev_add_region(dev->nvc_layout_tracker, reg_type, reg_version,
      61             :                         reg_blks, 0);
      62           0 :         if (!reg_props) {
      63           0 :                 return -1;
      64             :         }
      65           0 :         assert(reg_props->type == reg_type);
      66           0 :         assert(reg_props->ver == reg_version);
      67           0 :         assert(reg_props->blk_sz == reg_blks);
      68           0 :         assert(reg_props->blk_offs + reg_blks <= dev->layout.nvc.total_blocks);
      69           0 :         return 0;
      70             : }
      71             : 
      72             : static int
      73           0 : md_region_open(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, uint32_t reg_version,
      74             :                size_t entry_size, size_t entry_count, struct ftl_layout_region *region)
      75             : {
      76           0 :         const struct ftl_layout_tracker_bdev_region_props *reg_search_ctx = NULL;
      77           0 :         uint64_t reg_blks = ftl_md_region_blocks(dev, entry_size * entry_count);
      78             : 
      79           0 :         assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX);
      80             : 
      81             :         while (true) {
      82           0 :                 ftl_layout_tracker_bdev_find_next_region(dev->nvc_layout_tracker, reg_type, &reg_search_ctx);
      83           0 :                 if (!reg_search_ctx || reg_search_ctx->ver == reg_version) {
      84             :                         break;
      85             :                 }
      86             :         }
      87             : 
      88           0 :         if (!reg_search_ctx || reg_search_ctx->blk_sz < reg_blks) {
      89             :                 /* Region not found or insufficient space */
      90           0 :                 return -1;
      91             :         }
      92             : 
      93           0 :         if (!region) {
      94           0 :                 return 0;
      95             :         }
      96             : 
      97           0 :         md_region_setup(dev, reg_type, region);
      98             : 
      99           0 :         region->entry_size = entry_size / FTL_BLOCK_SIZE;
     100           0 :         region->num_entries = entry_count;
     101             : 
     102           0 :         region->current.version = reg_version;
     103           0 :         region->current.offset = reg_search_ctx->blk_offs;
     104           0 :         region->current.blocks = reg_search_ctx->blk_sz;
     105             : 
     106           0 :         return 0;
     107             : }
     108             : 
     109             : struct ftl_nv_cache_device_desc nvc_bdev_vss = {
     110             :         .name = "bdev",
     111             :         .features = {
     112             :         },
     113             :         .ops = {
     114             :                 .is_bdev_compatible = is_bdev_compatible,
     115             : 
     116             :                 .md_layout_ops = {
     117             :                         .region_create = md_region_create,
     118             :                         .region_open = md_region_open,
     119             :                 },
     120             :         }
     121             : };
     122           0 : FTL_NV_CACHE_DEVICE_TYPE_REGISTER(nvc_bdev_vss)

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