diff options
Diffstat (limited to 'drivers/nvme/host/nvme.h')
| -rw-r--r-- | drivers/nvme/host/nvme.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h new file mode 100644 index 000000000..044253dca --- /dev/null +++ b/drivers/nvme/host/nvme.h @@ -0,0 +1,157 @@ +/* + * Copyright (c) 2011-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ + +#ifndef _NVME_H +#define _NVME_H + +#include <linux/nvme.h> +#include <linux/pci.h> +#include <linux/kref.h> +#include <linux/blk-mq.h> + +extern unsigned char nvme_io_timeout; +#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) + +enum { + NVME_NS_LBA = 0, + NVME_NS_LIGHTNVM = 1, +}; + +/* + * Represents an NVM Express device. Each nvme_dev is a PCI function. + */ +struct nvme_dev { + struct list_head node; + struct nvme_queue **queues; + struct request_queue *admin_q; + struct blk_mq_tag_set tagset; + struct blk_mq_tag_set admin_tagset; + u32 __iomem *dbs; + struct device *dev; + struct dma_pool *prp_page_pool; + struct dma_pool *prp_small_pool; + int instance; + unsigned queue_count; + unsigned online_queues; + unsigned max_qid; + int q_depth; + u32 db_stride; + u32 ctrl_config; + struct msix_entry *entry; + struct nvme_bar __iomem *bar; + struct list_head namespaces; + struct kref kref; + struct device *device; + struct work_struct reset_work; + struct work_struct probe_work; + struct work_struct scan_work; + char name[12]; + char serial[20]; + char model[40]; + char firmware_rev[8]; + bool subsystem; + u32 max_hw_sectors; + u32 stripe_size; + u32 page_size; + void __iomem *cmb; + dma_addr_t cmb_dma_addr; + u64 cmb_size; + u32 cmbsz; + u16 oncs; + u16 abort_limit; + u8 event_limit; + u8 vwc; +}; + +/* + * An NVM Express namespace is equivalent to a SCSI LUN + */ +struct nvme_ns { + struct list_head list; + + struct nvme_dev *dev; + struct request_queue *queue; + struct gendisk *disk; + struct kref kref; + + unsigned ns_id; + int lba_shift; + u16 ms; + bool ext; + u8 pi_type; + int type; + u64 mode_select_num_blocks; + u32 mode_select_block_len; +}; + +/* + * The nvme_iod describes the data in an I/O, including the list of PRP + * entries. You can't see it in this data structure because C doesn't let + * me express that. Use nvme_alloc_iod to ensure there's enough space + * allocated to store the PRP list. + */ +struct nvme_iod { + unsigned long private; /* For the use of the submitter of the I/O */ + int npages; /* In the PRP list. 0 means small pool in use */ + int offset; /* Of PRP list */ + int nents; /* Used in scatterlist */ + int length; /* Of data, in bytes */ + dma_addr_t first_dma; + struct scatterlist meta_sg[1]; /* metadata requires single contiguous buffer */ + struct scatterlist sg[0]; +}; + +static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector) +{ + return (sector >> (ns->lba_shift - 9)); +} + +int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + void *buf, unsigned bufflen); +int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + void *buffer, void __user *ubuffer, unsigned bufflen, + u32 *result, unsigned timeout); +int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id); +int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid, + struct nvme_id_ns **id); +int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log); +int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, + dma_addr_t dma_addr, u32 *result); +int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, + dma_addr_t dma_addr, u32 *result); + +struct sg_io_hdr; + +int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr); +int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg); +int nvme_sg_get_version_num(int __user *ip); + +#ifdef CONFIG_NVM +int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id); +int nvme_nvm_register(struct request_queue *q, char *disk_name); +void nvme_nvm_unregister(struct request_queue *q, char *disk_name); +#else +static inline int nvme_nvm_register(struct request_queue *q, char *disk_name) +{ + return 0; +} + +static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {}; + +static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) +{ + return 0; +} +#endif /* CONFIG_NVM */ + +#endif /* _NVME_H */ |