LCOV - code coverage report
Current view: top level - spdk/lib/ftl/base - ftl_base_bdev.c (source / functions) Hit Total Coverage
Test: Combined Lines: 42 59 71.2 %
Date: 2024-12-13 09:49:32 Functions: 5 5 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 16 184 8.7 %

           Branch data     Line data    Source code
       1                 :            : /*   SPDX-License-Identifier: BSD-3-Clause
       2                 :            :  *   Copyright 2023 Solidigm All Rights Reserved
       3                 :            :  */
       4                 :            : 
       5                 :            : #include "ftl_base_dev.h"
       6                 :            : #include "ftl_core.h"
       7                 :            : #include "ftl_layout.h"
       8                 :            : #include "ftl_band.h"
       9                 :            : #include "utils/ftl_layout_tracker_bdev.h"
      10                 :            : 
      11                 :            : static bool
      12                 :         22 : is_bdev_compatible(struct spdk_ftl_dev *dev, struct spdk_bdev *bdev)
      13                 :            : {
      14                 :         22 :         uint64_t write_unit_size = spdk_bdev_get_write_unit_size(bdev);
      15                 :            : 
      16         [ -  + ]:         22 :         if (spdk_bdev_get_block_size(bdev) != FTL_BLOCK_SIZE) {
      17   [ #  #  #  #  :          0 :                 FTL_ERRLOG(dev, "Unsupported block size, only 4096 is supprted.\nn");
             #  #  #  # ]
      18                 :          0 :                 return false;
      19                 :            :         }
      20                 :            : 
      21         [ -  + ]:         22 :         if (spdk_bdev_get_md_size(bdev) != 0) {
      22                 :            :                 /* Bdev's metadata is unsupported */
      23   [ #  #  #  #  :          0 :                 FTL_ERRLOG(dev, "Unsupported metadata size, sector metadata isn't supported.\n");
             #  #  #  # ]
      24                 :          0 :                 return false;
      25                 :            :         }
      26                 :            : 
      27         [ +  - ]:         22 :         if (write_unit_size == 1) {
      28                 :            :                 /* No write unit size, all alignments will work out fine */
      29                 :         22 :                 return true;
      30                 :            :         }
      31                 :            : 
      32   [ #  #  #  #  :          0 :         if (!spdk_u32_is_pow2(write_unit_size) || write_unit_size > (MiB / FTL_BLOCK_SIZE)) {
                   #  # ]
      33                 :            :                 /* Needs to be a power of 2 for current band size (1GiB) restrictions.
      34                 :            :                  * Current buffers are allocated in 1MiB sizes (256 blocks), so it can't be larger than that.
      35                 :            :                  * In the future, if the restriction is relaxed, the ftl_bitmap_buffer_alignment (64 blocks)
      36                 :            :                  * will need to be taken into consideration as well.
      37                 :            :                  */
      38   [ #  #  #  #  :          0 :                 FTL_ERRLOG(dev,
             #  #  #  # ]
      39                 :            :                            "Unsupported write unit size (%lu), must be a power of 2 (in blocks). Can't be larger than 256 (1MiB)\n",
      40                 :            :                            write_unit_size);
      41                 :          0 :                 return false;
      42                 :            :         }
      43                 :            : 
      44                 :          0 :         return true;
      45                 :          0 : }
      46                 :            : 
      47                 :            : static void
      48                 :         32 : md_region_setup(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type,
      49                 :            :                 struct ftl_layout_region *region)
      50                 :            : {
      51   [ -  +  #  # ]:         32 :         assert(region);
      52   [ #  #  #  # ]:         32 :         region->type = reg_type;
      53   [ #  #  #  # ]:         32 :         region->mirror_type = FTL_LAYOUT_REGION_TYPE_INVALID;
      54   [ #  #  #  # ]:         32 :         region->name = ftl_md_region_name(reg_type);
      55                 :            : 
      56   [ #  #  #  #  :         32 :         region->bdev_desc = dev->base_bdev_desc;
             #  #  #  # ]
      57   [ #  #  #  #  :         32 :         region->ioch = dev->base_ioch;
             #  #  #  # ]
      58   [ #  #  #  # ]:         32 :         region->vss_blksz = 0;
      59                 :         32 : }
      60                 :            : 
      61                 :            : static int
      62                 :         32 : md_region_create(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type,
      63                 :            :                  uint32_t reg_version, size_t reg_blks)
      64                 :            : {
      65                 :            :         const struct ftl_layout_tracker_bdev_region_props *reg_props;
      66                 :            :         uint64_t data_base_alignment;
      67                 :            : 
      68   [ -  +  #  # ]:         32 :         assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX);
      69                 :         32 :         reg_blks = ftl_md_region_align_blocks(dev, reg_blks);
      70                 :            : 
      71                 :            :         /* Allocating a ftl_bitmap requires a 8B input buffer alignment, since we're reusing the global valid map md buffer
      72                 :            :          * this means that each band starting address needs to be aligned too - each device sector takes 1b in the valid map,
      73                 :            :          * so 64 sectors (8*8) is the needed alignment
      74                 :            :          */
      75                 :         32 :         data_base_alignment = 8 * ftl_bitmap_buffer_alignment;
      76   [ #  #  #  # ]:         32 :         reg_props = ftl_layout_tracker_bdev_add_region(dev->base_layout_tracker, reg_type, reg_version,
      77                 :          0 :                         reg_blks, data_base_alignment);
      78         [ -  + ]:         32 :         if (!reg_props) {
      79                 :          0 :                 return -1;
      80                 :            :         }
      81   [ -  +  #  #  :         32 :         assert(reg_props->type == reg_type);
             #  #  #  # ]
      82   [ -  +  #  #  :         32 :         assert(reg_props->ver == reg_version);
             #  #  #  # ]
      83   [ -  +  #  #  :         32 :         assert(reg_props->blk_sz == reg_blks);
             #  #  #  # ]
      84   [ -  +  #  #  :         32 :         assert(reg_props->blk_offs + reg_blks <= dev->layout.base.total_blocks);
          #  #  #  #  #  
          #  #  #  #  #  
                   #  # ]
      85                 :         32 :         return 0;
      86                 :          0 : }
      87                 :            : 
      88                 :            : static int
      89                 :         32 : md_region_open(struct spdk_ftl_dev *dev, enum ftl_layout_region_type reg_type, uint32_t reg_version,
      90                 :            :                size_t entry_size, size_t entry_count, struct ftl_layout_region *region)
      91                 :            : {
      92                 :         32 :         const struct ftl_layout_tracker_bdev_region_props *reg_search_ctx = NULL;
      93                 :         32 :         uint64_t reg_blks = ftl_md_region_blocks(dev, entry_size * entry_count);
      94                 :            : 
      95   [ +  -  #  # ]:         32 :         assert(reg_type < FTL_LAYOUT_REGION_TYPE_MAX);
      96                 :            : 
      97                 :          0 :         while (true) {
      98   [ #  #  #  # ]:         32 :                 ftl_layout_tracker_bdev_find_next_region(dev->base_layout_tracker, reg_type, &reg_search_ctx);
      99   [ +  -  -  +  :         32 :                 if (!reg_search_ctx || reg_search_ctx->ver == reg_version) {
             #  #  #  # ]
     100                 :          0 :                         break;
     101                 :            :                 }
     102                 :            :         }
     103                 :            : 
     104   [ +  -  -  +  :         32 :         if (!reg_search_ctx || reg_search_ctx->blk_sz < reg_blks) {
             #  #  #  # ]
     105                 :            :                 /* Region not found or insufficient space */
     106                 :          0 :                 return -1;
     107                 :            :         }
     108                 :            : 
     109         [ -  + ]:         32 :         if (!region) {
     110                 :          0 :                 return 0;
     111                 :            :         }
     112                 :            : 
     113                 :         32 :         md_region_setup(dev, reg_type, region);
     114                 :            : 
     115   [ #  #  #  #  :         32 :         region->entry_size = entry_size / FTL_BLOCK_SIZE;
                   #  # ]
     116   [ #  #  #  # ]:         32 :         region->num_entries = entry_count;
     117                 :            : 
     118   [ #  #  #  #  :         32 :         region->current.version = reg_version;
                   #  # ]
     119   [ #  #  #  #  :         32 :         region->current.offset = reg_search_ctx->blk_offs;
          #  #  #  #  #  
                      # ]
     120   [ #  #  #  #  :         32 :         region->current.blocks = reg_search_ctx->blk_sz;
          #  #  #  #  #  
                      # ]
     121                 :            : 
     122                 :         32 :         return 0;
     123                 :          0 : }
     124                 :            : 
     125                 :            : struct ftl_base_device_type base_bdev = {
     126                 :            :         .name = "base_bdev",
     127                 :            :         .ops = {
     128                 :            :                 .is_bdev_compatible = is_bdev_compatible,
     129                 :            : 
     130                 :            :                 .md_layout_ops = {
     131                 :            :                         .region_create = md_region_create,
     132                 :            :                         .region_open = md_region_open,
     133                 :            :                 },
     134                 :            :         }
     135                 :            : };
     136                 :       2102 : FTL_BASE_DEVICE_TYPE_REGISTER(base_bdev)

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