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