/* * 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 */Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp | |
| matthew r. ochs | matthew r. ochs | 130 | 100.00% | 1 | 100.00% |
| Total | 130 | 100.00% | 1 | 100.00% |