numam-spdk/lib/ftl/ftl_ppa.h

/*-
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 */

#ifndef FTL_PPA_H
#define FTL_PPA_H

#include "spdk/stdinc.h"

/* Marks PPA as invalid */
#define FTL_PPA_INVALID		(-1)
/* Marks LBA as invalid */
#define FTL_LBA_INVALID		((uint64_t)-1)
/* Smallest data unit size */
#define FTL_BLOCK_SIZE		4096

/* This structure represents PPA address. It can have one of the following */
/* formats: */
/*        - PPA describing the on-disk address */
/*        - offset inside the cache (indicated by the cached flag) */
/*        - packed version of the two formats above (can be only used when the */
/*          on-disk PPA address can be represented in less than 32 bits) */
/* Packed format is used, when possible, to avoid wasting RAM on the L2P table. */
struct ftl_ppa {
	union {
		struct {
			uint64_t lbk	: 32;
			uint64_t chk	: 16;
			uint64_t pu	: 8;
			uint64_t grp	: 7;
			uint64_t rsvd	: 1;
		};

		struct {
			uint64_t offset	: 63;
			uint64_t cached : 1;
		};

		struct {
			union {
				struct  {
					uint32_t offset : 31;
					uint32_t cached : 1;
				};

				uint32_t ppa;
			};
			uint32_t rsvd;
		} pack;

		uint64_t ppa;
	};
};

struct ftl_ppa_fmt {
	/* Logical block */
	unsigned int				lbk_offset;
	unsigned int				lbk_mask;

	/* Chunk */
	unsigned int				chk_offset;
	unsigned int				chk_mask;

	/* Parallel unit (NAND die) */
	unsigned int				pu_offset;
	unsigned int				pu_mask;

	/* Group */
	unsigned int				grp_offset;
	unsigned int				grp_mask;
};

#endif /* FTL_PPA_H */