1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * CXL Flash Device Driver |
4 | * |
5 | * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation |
6 | * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation |
7 | * |
8 | * Copyright (C) 2015 IBM Corporation |
9 | */ |
10 | |
11 | #ifndef _CXLFLASH_VLUN_H |
12 | #define _CXLFLASH_VLUN_H |
13 | |
14 | /* RHT - Resource Handle Table */ |
15 | #define MC_RHT_NMASK 16 /* in bits */ |
16 | #define MC_CHUNK_SHIFT MC_RHT_NMASK /* shift to go from LBA to chunk# */ |
17 | |
18 | #define HIBIT (BITS_PER_LONG - 1) |
19 | |
20 | #define MAX_AUN_CLONE_CNT 0xFF |
21 | |
22 | /* |
23 | * LXT - LBA Translation Table |
24 | * |
25 | * +-------+-------+-------+-------+-------+-------+-------+---+---+ |
26 | * | RLBA_BASE |LUN_IDX| P |SEL| |
27 | * +-------+-------+-------+-------+-------+-------+-------+---+---+ |
28 | * |
29 | * The LXT Entry contains the physical LBA where the chunk starts (RLBA_BASE). |
30 | * AFU ORes the low order bits from the virtual LBA (offset into the chunk) |
31 | * with RLBA_BASE. The result is the physical LBA to be sent to storage. |
32 | * The LXT Entry also contains an index to a LUN TBL and a bitmask of which |
33 | * outgoing (FC) * ports can be selected. The port select bit-mask is ANDed |
34 | * with a global port select bit-mask maintained by the driver. |
35 | * In addition, it has permission bits that are ANDed with the |
36 | * RHT permissions to arrive at the final permissions for the chunk. |
37 | * |
38 | * LXT tables are allocated dynamically in groups. This is done to avoid |
39 | * a malloc/free overhead each time the LXT has to grow or shrink. |
40 | * |
41 | * Based on the current lxt_cnt (used), it is always possible to know |
42 | * how many are allocated (used+free). The number of allocated entries is |
43 | * not stored anywhere. |
44 | * |
45 | * The LXT table is re-allocated whenever it needs to cross into another group. |
46 | */ |
47 | #define LXT_GROUP_SIZE 8 |
48 | #define LXT_NUM_GROUPS(lxt_cnt) (((lxt_cnt) + 7)/8) /* alloc'ed groups */ |
49 | #define LXT_LUNIDX_SHIFT 8 /* LXT entry, shift for LUN index */ |
50 | #define LXT_PERM_SHIFT 4 /* LXT entry, shift for permission bits */ |
51 | |
52 | struct ba_lun_info { |
53 | u64 *lun_alloc_map; |
54 | u32 lun_bmap_size; |
55 | u32 total_aus; |
56 | u64 free_aun_cnt; |
57 | |
58 | /* indices to be used for elevator lookup of free map */ |
59 | u32 free_low_idx; |
60 | u32 free_curr_idx; |
61 | u32 free_high_idx; |
62 | |
63 | u8 *aun_clone_map; |
64 | }; |
65 | |
66 | struct ba_lun { |
67 | u64 lun_id; |
68 | u64 wwpn; |
69 | size_t lsize; /* LUN size in number of LBAs */ |
70 | size_t lba_size; /* LBA size in number of bytes */ |
71 | size_t au_size; /* Allocation Unit size in number of LBAs */ |
72 | struct ba_lun_info *ba_lun_handle; |
73 | }; |
74 | |
75 | /* Block Allocator */ |
76 | struct blka { |
77 | struct ba_lun ba_lun; |
78 | u64 nchunk; /* number of chunks */ |
79 | struct mutex mutex; |
80 | }; |
81 | |
82 | #endif /* ifndef _CXLFLASH_SUPERPIPE_H */ |
83 | |