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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 20:46:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 20:46:08 -0800
commiteffa04cc5a31b3f12cda6025ab93460f1f0e454e (patch)
tree4abea24fe619c2f7250d373af014c9693f350100 /include
parenta9aa31cdc2a7be4a70b0ea24a451dfeb00ce0024 (diff)
parent5f436e5ef170e5d3301bf5777a3c7c048295db1c (diff)
downloadlinux-effa04cc5a31b3f12cda6025ab93460f1f0e454e.tar.bz2
Merge branch 'for-4.4/lightnvm' of git://git.kernel.dk/linux-block
Pull lightnvm support from Jens Axboe: "This adds support for lightnvm, and adds support to NVMe as well. This is pretty exciting, in that it enables new and interesting use cases for compatible flash devices. There's a LWN writeup about an earlier posting here: https://lwn.net/Articles/641247/ This has been underway for a while, and should be ready for merging at this point" * 'for-4.4/lightnvm' of git://git.kernel.dk/linux-block: nvme: lightnvm: clean up a data type lightnvm: refactor phys addrs type to u64 nvme: LightNVM support rrpc: Round-robin sector target with cost-based gc gennvm: Generic NVM manager lightnvm: Support for Open-Channel SSDs
Diffstat (limited to 'include')
-rw-r--r--include/linux/lightnvm.h522
-rw-r--r--include/uapi/linux/lightnvm.h130
2 files changed, 652 insertions, 0 deletions
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
new file mode 100644
index 000000000000..5ebd70d12f35
--- /dev/null
+++ b/include/linux/lightnvm.h
@@ -0,0 +1,522 @@
+#ifndef NVM_H
+#define NVM_H
+
+enum {
+ NVM_IO_OK = 0,
+ NVM_IO_REQUEUE = 1,
+ NVM_IO_DONE = 2,
+ NVM_IO_ERR = 3,
+
+ NVM_IOTYPE_NONE = 0,
+ NVM_IOTYPE_GC = 1,
+};
+
+#ifdef CONFIG_NVM
+
+#include <linux/blkdev.h>
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/dmapool.h>
+
+enum {
+ /* HW Responsibilities */
+ NVM_RSP_L2P = 1 << 0,
+ NVM_RSP_ECC = 1 << 1,
+
+ /* Physical Adressing Mode */
+ NVM_ADDRMODE_LINEAR = 0,
+ NVM_ADDRMODE_CHANNEL = 1,
+
+ /* Plane programming mode for LUN */
+ NVM_PLANE_SINGLE = 0,
+ NVM_PLANE_DOUBLE = 1,
+ NVM_PLANE_QUAD = 2,
+
+ /* Status codes */
+ NVM_RSP_SUCCESS = 0x0,
+ NVM_RSP_NOT_CHANGEABLE = 0x1,
+ NVM_RSP_ERR_FAILWRITE = 0x40ff,
+ NVM_RSP_ERR_EMPTYPAGE = 0x42ff,
+
+ /* Device opcodes */
+ NVM_OP_HBREAD = 0x02,
+ NVM_OP_HBWRITE = 0x81,
+ NVM_OP_PWRITE = 0x91,
+ NVM_OP_PREAD = 0x92,
+ NVM_OP_ERASE = 0x90,
+
+ /* PPA Command Flags */
+ NVM_IO_SNGL_ACCESS = 0x0,
+ NVM_IO_DUAL_ACCESS = 0x1,
+ NVM_IO_QUAD_ACCESS = 0x2,
+
+ NVM_IO_SUSPEND = 0x80,
+ NVM_IO_SLC_MODE = 0x100,
+ NVM_IO_SCRAMBLE_DISABLE = 0x200,
+};
+
+struct nvm_id_group {
+ u8 mtype;
+ u8 fmtype;
+ u16 res16;
+ u8 num_ch;
+ u8 num_lun;
+ u8 num_pln;
+ u16 num_blk;
+ u16 num_pg;
+ u16 fpg_sz;
+ u16 csecs;
+ u16 sos;
+ u32 trdt;
+ u32 trdm;
+ u32 tprt;
+ u32 tprm;
+ u32 tbet;
+ u32 tbem;
+ u32 mpos;
+ u16 cpar;
+ u8 res[913];
+} __packed;
+
+struct nvm_addr_format {
+ u8 ch_offset;
+ u8 ch_len;
+ u8 lun_offset;
+ u8 lun_len;
+ u8 pln_offset;
+ u8 pln_len;
+ u8 blk_offset;
+ u8 blk_len;
+ u8 pg_offset;
+ u8 pg_len;
+ u8 sect_offset;
+ u8 sect_len;
+ u8 res[4];
+};
+
+struct nvm_id {
+ u8 ver_id;
+ u8 vmnt;
+ u8 cgrps;
+ u8 res[5];
+ u32 cap;
+ u32 dom;
+ struct nvm_addr_format ppaf;
+ u8 ppat;
+ u8 resv[224];
+ struct nvm_id_group groups[4];
+} __packed;
+
+struct nvm_target {
+ struct list_head list;
+ struct nvm_tgt_type *type;
+ struct gendisk *disk;
+};
+
+struct nvm_tgt_instance {
+ struct nvm_tgt_type *tt;
+};
+
+#define ADDR_EMPTY (~0ULL)
+
+#define NVM_VERSION_MAJOR 1
+#define NVM_VERSION_MINOR 0
+#define NVM_VERSION_PATCH 0
+
+#define NVM_SEC_BITS (8)
+#define NVM_PL_BITS (6)
+#define NVM_PG_BITS (16)
+#define NVM_BLK_BITS (16)
+#define NVM_LUN_BITS (10)
+#define NVM_CH_BITS (8)
+
+struct ppa_addr {
+ union {
+ /* Channel-based PPA format in nand 4x2x2x2x8x10 */
+ struct {
+ u64 ch : 4;
+ u64 sec : 2; /* 4 sectors per page */
+ u64 pl : 2; /* 4 planes per LUN */
+ u64 lun : 2; /* 4 LUNs per channel */
+ u64 pg : 8; /* 256 pages per block */
+ u64 blk : 10;/* 1024 blocks per plane */
+ u64 resved : 36;
+ } chnl;
+
+ /* Generic structure for all addresses */
+ struct {
+ u64 sec : NVM_SEC_BITS;
+ u64 pl : NVM_PL_BITS;
+ u64 pg : NVM_PG_BITS;
+ u64 blk : NVM_BLK_BITS;
+ u64 lun : NVM_LUN_BITS;
+ u64 ch : NVM_CH_BITS;
+ } g;
+
+ u64 ppa;
+ };
+} __packed;
+
+struct nvm_rq {
+ struct nvm_tgt_instance *ins;
+ struct nvm_dev *dev;
+
+ struct bio *bio;
+
+ union {
+ struct ppa_addr ppa_addr;
+ dma_addr_t dma_ppa_list;
+ };
+
+ struct ppa_addr *ppa_list;
+
+ void *metadata;
+ dma_addr_t dma_metadata;
+
+ uint8_t opcode;
+ uint16_t nr_pages;
+ uint16_t flags;
+};
+
+static inline struct nvm_rq *nvm_rq_from_pdu(void *pdu)
+{
+ return pdu - sizeof(struct nvm_rq);
+}
+
+static inline void *nvm_rq_to_pdu(struct nvm_rq *rqdata)
+{
+ return rqdata + 1;
+}
+
+struct nvm_block;
+
+typedef int (nvm_l2p_update_fn)(u64, u32, __le64 *, void *);
+typedef int (nvm_bb_update_fn)(u32, void *, unsigned int, void *);
+typedef int (nvm_id_fn)(struct request_queue *, struct nvm_id *);
+typedef int (nvm_get_l2p_tbl_fn)(struct request_queue *, u64, u32,
+ nvm_l2p_update_fn *, void *);
+typedef int (nvm_op_bb_tbl_fn)(struct request_queue *, int, unsigned int,
+ nvm_bb_update_fn *, void *);
+typedef int (nvm_op_set_bb_fn)(struct request_queue *, struct nvm_rq *, int);
+typedef int (nvm_submit_io_fn)(struct request_queue *, struct nvm_rq *);
+typedef int (nvm_erase_blk_fn)(struct request_queue *, struct nvm_rq *);
+typedef void *(nvm_create_dma_pool_fn)(struct request_queue *, char *);
+typedef void (nvm_destroy_dma_pool_fn)(void *);
+typedef void *(nvm_dev_dma_alloc_fn)(struct request_queue *, void *, gfp_t,
+ dma_addr_t *);
+typedef void (nvm_dev_dma_free_fn)(void *, void*, dma_addr_t);
+
+struct nvm_dev_ops {
+ nvm_id_fn *identity;
+ nvm_get_l2p_tbl_fn *get_l2p_tbl;
+ nvm_op_bb_tbl_fn *get_bb_tbl;
+ nvm_op_set_bb_fn *set_bb;
+
+ nvm_submit_io_fn *submit_io;
+ nvm_erase_blk_fn *erase_block;
+
+ nvm_create_dma_pool_fn *create_dma_pool;
+ nvm_destroy_dma_pool_fn *destroy_dma_pool;
+ nvm_dev_dma_alloc_fn *dev_dma_alloc;
+ nvm_dev_dma_free_fn *dev_dma_free;
+
+ uint8_t max_phys_sect;
+};
+
+struct nvm_lun {
+ int id;
+
+ int lun_id;
+ int chnl_id;
+
+ unsigned int nr_free_blocks; /* Number of unused blocks */
+ struct nvm_block *blocks;
+
+ spinlock_t lock;
+};
+
+struct nvm_block {
+ struct list_head list;
+ struct nvm_lun *lun;
+ unsigned long id;
+
+ void *priv;
+ int type;
+};
+
+struct nvm_dev {
+ struct nvm_dev_ops *ops;
+
+ struct list_head devices;
+ struct list_head online_targets;
+
+ /* Media manager */
+ struct nvmm_type *mt;
+ void *mp;
+
+ /* Device information */
+ int nr_chnls;
+ int nr_planes;
+ int luns_per_chnl;
+ int sec_per_pg; /* only sectors for a single page */
+ int pgs_per_blk;
+ int blks_per_lun;
+ int sec_size;
+ int oob_size;
+ int addr_mode;
+ struct nvm_addr_format addr_format;
+
+ /* Calculated/Cached values. These do not reflect the actual usable
+ * blocks at run-time.
+ */
+ int max_rq_size;
+ int plane_mode; /* drive device in single, double or quad mode */
+
+ int sec_per_pl; /* all sectors across planes */
+ int sec_per_blk;
+ int sec_per_lun;
+
+ unsigned long total_pages;
+ unsigned long total_blocks;
+ int nr_luns;
+ unsigned max_pages_per_blk;
+
+ void *ppalist_pool;
+
+ struct nvm_id identity;
+
+ /* Backend device */
+ struct request_queue *q;
+ char name[DISK_NAME_LEN];
+};
+
+/* fallback conversion */
+static struct ppa_addr __generic_to_linear_addr(struct nvm_dev *dev,
+ struct ppa_addr r)
+{
+ struct ppa_addr l;
+
+ l.ppa = r.g.sec +
+ r.g.pg * dev->sec_per_pg +
+ r.g.blk * (dev->pgs_per_blk *
+ dev->sec_per_pg) +
+ r.g.lun * (dev->blks_per_lun *
+ dev->pgs_per_blk *
+ dev->sec_per_pg) +
+ r.g.ch * (dev->blks_per_lun *
+ dev->pgs_per_blk *
+ dev->luns_per_chnl *
+ dev->sec_per_pg);
+
+ return l;
+}
+
+/* fallback conversion */
+static struct ppa_addr __linear_to_generic_addr(struct nvm_dev *dev,
+ struct ppa_addr r)
+{
+ struct ppa_addr l;
+ int secs, pgs, blks, luns;
+ sector_t ppa = r.ppa;
+
+ l.ppa = 0;
+
+ div_u64_rem(ppa, dev->sec_per_pg, &secs);
+ l.g.sec = secs;
+
+ sector_div(ppa, dev->sec_per_pg);
+ div_u64_rem(ppa, dev->sec_per_blk, &pgs);
+ l.g.pg = pgs;
+
+ sector_div(ppa, dev->pgs_per_blk);
+ div_u64_rem(ppa, dev->blks_per_lun, &blks);
+ l.g.blk = blks;
+
+ sector_div(ppa, dev->blks_per_lun);
+ div_u64_rem(ppa, dev->luns_per_chnl, &luns);
+ l.g.lun = luns;
+
+ sector_div(ppa, dev->luns_per_chnl);
+ l.g.ch = ppa;
+
+ return l;
+}
+
+static struct ppa_addr __generic_to_chnl_addr(struct ppa_addr r)
+{
+ struct ppa_addr l;
+
+ l.ppa = 0;
+
+ l.chnl.sec = r.g.sec;
+ l.chnl.pl = r.g.pl;
+ l.chnl.pg = r.g.pg;
+ l.chnl.blk = r.g.blk;
+ l.chnl.lun = r.g.lun;
+ l.chnl.ch = r.g.ch;
+
+ return l;
+}
+
+static struct ppa_addr __chnl_to_generic_addr(struct ppa_addr r)
+{
+ struct ppa_addr l;
+
+ l.ppa = 0;
+
+ l.g.sec = r.chnl.sec;
+ l.g.pl = r.chnl.pl;
+ l.g.pg = r.chnl.pg;
+ l.g.blk = r.chnl.blk;
+ l.g.lun = r.chnl.lun;
+ l.g.ch = r.chnl.ch;
+
+ return l;
+}
+
+static inline struct ppa_addr addr_to_generic_mode(struct nvm_dev *dev,
+ struct ppa_addr gppa)
+{
+ switch (dev->addr_mode) {
+ case NVM_ADDRMODE_LINEAR:
+ return __linear_to_generic_addr(dev, gppa);
+ case NVM_ADDRMODE_CHANNEL:
+ return __chnl_to_generic_addr(gppa);
+ default:
+ BUG();
+ }
+ return gppa;
+}
+
+static inline struct ppa_addr generic_to_addr_mode(struct nvm_dev *dev,
+ struct ppa_addr gppa)
+{
+ switch (dev->addr_mode) {
+ case NVM_ADDRMODE_LINEAR:
+ return __generic_to_linear_addr(dev, gppa);
+ case NVM_ADDRMODE_CHANNEL:
+ return __generic_to_chnl_addr(gppa);
+ default:
+ BUG();
+ }
+ return gppa;
+}
+
+static inline int ppa_empty(struct ppa_addr ppa_addr)
+{
+ return (ppa_addr.ppa == ADDR_EMPTY);
+}
+
+static inline void ppa_set_empty(struct ppa_addr *ppa_addr)
+{
+ ppa_addr->ppa = ADDR_EMPTY;
+}
+
+static inline struct ppa_addr block_to_ppa(struct nvm_dev *dev,
+ struct nvm_block *blk)
+{
+ struct ppa_addr ppa;
+ struct nvm_lun *lun = blk->lun;
+
+ ppa.ppa = 0;
+ ppa.g.blk = blk->id % dev->blks_per_lun;
+ ppa.g.lun = lun->lun_id;
+ ppa.g.ch = lun->chnl_id;
+
+ return ppa;
+}
+
+typedef void (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
+typedef sector_t (nvm_tgt_capacity_fn)(void *);
+typedef int (nvm_tgt_end_io_fn)(struct nvm_rq *, int);
+typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
+typedef void (nvm_tgt_exit_fn)(void *);
+
+struct nvm_tgt_type {
+ const char *name;
+ unsigned int version[3];
+
+ /* target entry points */
+ nvm_tgt_make_rq_fn *make_rq;
+ nvm_tgt_capacity_fn *capacity;
+ nvm_tgt_end_io_fn *end_io;
+
+ /* module-specific init/teardown */
+ nvm_tgt_init_fn *init;
+ nvm_tgt_exit_fn *exit;
+
+ /* For internal use */
+ struct list_head list;
+};
+
+extern int nvm_register_target(struct nvm_tgt_type *);
+extern void nvm_unregister_target(struct nvm_tgt_type *);
+
+extern void *nvm_dev_dma_alloc(struct nvm_dev *, gfp_t, dma_addr_t *);
+extern void nvm_dev_dma_free(struct nvm_dev *, void *, dma_addr_t);
+
+typedef int (nvmm_register_fn)(struct nvm_dev *);
+typedef void (nvmm_unregister_fn)(struct nvm_dev *);
+typedef struct nvm_block *(nvmm_get_blk_fn)(struct nvm_dev *,
+ struct nvm_lun *, unsigned long);
+typedef void (nvmm_put_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_open_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_close_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
+typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
+typedef int (nvmm_end_io_fn)(struct nvm_rq *, int);
+typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
+ unsigned long);
+typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
+typedef void (nvmm_free_blocks_print_fn)(struct nvm_dev *);
+
+struct nvmm_type {
+ const char *name;
+ unsigned int version[3];
+
+ nvmm_register_fn *register_mgr;
+ nvmm_unregister_fn *unregister_mgr;
+
+ /* Block administration callbacks */
+ nvmm_get_blk_fn *get_blk;
+ nvmm_put_blk_fn *put_blk;
+ nvmm_open_blk_fn *open_blk;
+ nvmm_close_blk_fn *close_blk;
+ nvmm_flush_blk_fn *flush_blk;
+
+ nvmm_submit_io_fn *submit_io;
+ nvmm_end_io_fn *end_io;
+ nvmm_erase_blk_fn *erase_blk;
+
+ /* Configuration management */
+ nvmm_get_lun_fn *get_lun;
+
+ /* Statistics */
+ nvmm_free_blocks_print_fn *free_blocks_print;
+ struct list_head list;
+};
+
+extern int nvm_register_mgr(struct nvmm_type *);
+extern void nvm_unregister_mgr(struct nvmm_type *);
+
+extern struct nvm_block *nvm_get_blk(struct nvm_dev *, struct nvm_lun *,
+ unsigned long);
+extern void nvm_put_blk(struct nvm_dev *, struct nvm_block *);
+
+extern int nvm_register(struct request_queue *, char *,
+ struct nvm_dev_ops *);
+extern void nvm_unregister(char *);
+
+extern int nvm_submit_io(struct nvm_dev *, struct nvm_rq *);
+extern int nvm_erase_blk(struct nvm_dev *, struct nvm_block *);
+#else /* CONFIG_NVM */
+struct nvm_dev_ops;
+
+static inline int nvm_register(struct request_queue *q, char *disk_name,
+ struct nvm_dev_ops *ops)
+{
+ return -EINVAL;
+}
+static inline void nvm_unregister(char *disk_name) {}
+#endif /* CONFIG_NVM */
+#endif /* LIGHTNVM.H */
diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
new file mode 100644
index 000000000000..928f98997d8a
--- /dev/null
+++ b/include/uapi/linux/lightnvm.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2015 CNEX Labs. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ */
+
+#ifndef _UAPI_LINUX_LIGHTNVM_H
+#define _UAPI_LINUX_LIGHTNVM_H
+
+#ifdef __KERNEL__
+#include <linux/kernel.h>
+#include <linux/ioctl.h>
+#else /* __KERNEL__ */
+#include <stdio.h>
+#include <sys/ioctl.h>
+#define DISK_NAME_LEN 32
+#endif /* __KERNEL__ */
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define NVM_TTYPE_NAME_MAX 48
+#define NVM_TTYPE_MAX 63
+
+#define NVM_CTRL_FILE "/dev/lightnvm/control"
+
+struct nvm_ioctl_info_tgt {
+ __u32 version[3];
+ __u32 reserved;
+ char tgtname[NVM_TTYPE_NAME_MAX];
+};
+
+struct nvm_ioctl_info {
+ __u32 version[3]; /* in/out - major, minor, patch */
+ __u16 tgtsize; /* number of targets */
+ __u16 reserved16; /* pad to 4K page */
+ __u32 reserved[12];
+ struct nvm_ioctl_info_tgt tgts[NVM_TTYPE_MAX];
+};
+
+enum {
+ NVM_DEVICE_ACTIVE = 1 << 0,
+};
+
+struct nvm_ioctl_device_info {
+ char devname[DISK_NAME_LEN];
+ char bmname[NVM_TTYPE_NAME_MAX];
+ __u32 bmversion[3];
+ __u32 flags;
+ __u32 reserved[8];
+};
+
+struct nvm_ioctl_get_devices {
+ __u32 nr_devices;
+ __u32 reserved[31];
+ struct nvm_ioctl_device_info info[31];
+};
+
+struct nvm_ioctl_create_simple {
+ __u32 lun_begin;
+ __u32 lun_end;
+};
+
+enum {
+ NVM_CONFIG_TYPE_SIMPLE = 0,
+};
+
+struct nvm_ioctl_create_conf {
+ __u32 type;
+ union {
+ struct nvm_ioctl_create_simple s;
+ };
+};
+
+struct nvm_ioctl_create {
+ char dev[DISK_NAME_LEN]; /* open-channel SSD device */
+ char tgttype[NVM_TTYPE_NAME_MAX]; /* target type name */
+ char tgtname[DISK_NAME_LEN]; /* dev to expose target as */
+
+ __u32 flags;
+
+ struct nvm_ioctl_create_conf conf;
+};
+
+struct nvm_ioctl_remove {
+ char tgtname[DISK_NAME_LEN];
+
+ __u32 flags;
+};
+
+
+/* The ioctl type, 'L', 0x20 - 0x2F documented in ioctl-number.txt */
+enum {
+ /* top level cmds */
+ NVM_INFO_CMD = 0x20,
+ NVM_GET_DEVICES_CMD,
+
+ /* device level cmds */
+ NVM_DEV_CREATE_CMD,
+ NVM_DEV_REMOVE_CMD,
+};
+
+#define NVM_IOCTL 'L' /* 0x4c */
+
+#define NVM_INFO _IOWR(NVM_IOCTL, NVM_INFO_CMD, \
+ struct nvm_ioctl_info)
+#define NVM_GET_DEVICES _IOR(NVM_IOCTL, NVM_GET_DEVICES_CMD, \
+ struct nvm_ioctl_get_devices)
+#define NVM_DEV_CREATE _IOW(NVM_IOCTL, NVM_DEV_CREATE_CMD, \
+ struct nvm_ioctl_create)
+#define NVM_DEV_REMOVE _IOW(NVM_IOCTL, NVM_DEV_REMOVE_CMD, \
+ struct nvm_ioctl_remove)
+
+#define NVM_VERSION_MAJOR 1
+#define NVM_VERSION_MINOR 0
+#define NVM_VERSION_PATCHLEVEL 0
+
+#endif