| /* |
| * CXL Flash Device Driver |
| * |
| * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation |
| * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation |
| * |
| * Copyright (C) 2015 IBM Corporation |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #ifndef _CXLFLASH_VLUN_H |
| #define _CXLFLASH_VLUN_H |
| |
| /* RHT - Resource Handle Table */ |
| #define MC_RHT_NMASK 16 /* in bits */ |
| #define MC_CHUNK_SHIFT MC_RHT_NMASK /* shift to go from LBA to chunk# */ |
| |
| #define HIBIT (BITS_PER_LONG - 1) |
| |
| #define MAX_AUN_CLONE_CNT 0xFF |
| |
| /* |
| * LXT - LBA Translation Table |
| * |
| * +-------+-------+-------+-------+-------+-------+-------+---+---+ |
| * | RLBA_BASE |LUN_IDX| P |SEL| |
| * +-------+-------+-------+-------+-------+-------+-------+---+---+ |
| * |
| * The LXT Entry contains the physical LBA where the chunk starts (RLBA_BASE). |
| * AFU ORes the low order bits from the virtual LBA (offset into the chunk) |
| * with RLBA_BASE. The result is the physical LBA to be sent to storage. |
| * The LXT Entry also contains an index to a LUN TBL and a bitmask of which |
| * outgoing (FC) * ports can be selected. The port select bit-mask is ANDed |
| * with a global port select bit-mask maintained by the driver. |
| * In addition, it has permission bits that are ANDed with the |
| * RHT permissions to arrive at the final permissions for the chunk. |
| * |
| * LXT tables are allocated dynamically in groups. This is done to avoid |
| * a malloc/free overhead each time the LXT has to grow or shrink. |
| * |
| * Based on the current lxt_cnt (used), it is always possible to know |
| * how many are allocated (used+free). The number of allocated entries is |
| * not stored anywhere. |
| * |
| * The LXT table is re-allocated whenever it needs to cross into another group. |
| */ |
| #define LXT_GROUP_SIZE 8 |
| #define LXT_NUM_GROUPS(lxt_cnt) (((lxt_cnt) + 7)/8) /* alloc'ed groups */ |
| #define LXT_LUNIDX_SHIFT 8 /* LXT entry, shift for LUN index */ |
| #define LXT_PERM_SHIFT 4 /* LXT entry, shift for permission bits */ |
| |
| struct ba_lun_info { |
| u64 *lun_alloc_map; |
| u32 lun_bmap_size; |
| u32 total_aus; |
| u64 free_aun_cnt; |
| |
| /* indices to be used for elevator lookup of free map */ |
| u32 free_low_idx; |
| u32 free_curr_idx; |
| u32 free_high_idx; |
| |
| u8 *aun_clone_map; |
| }; |
| |
| struct ba_lun { |
| u64 lun_id; |
| u64 wwpn; |
| size_t lsize; /* LUN size in number of LBAs */ |
| size_t lba_size; /* LBA size in number of bytes */ |
| size_t au_size; /* Allocation Unit size in number of LBAs */ |
| struct ba_lun_info *ba_lun_handle; |
| }; |
| |
| /* Block Allocator */ |
| struct blka { |
| struct ba_lun ba_lun; |
| u64 nchunk; /* number of chunks */ |
| struct mutex mutex; |
| }; |
| |
| #endif /* ifndef _CXLFLASH_SUPERPIPE_H */ |