2 * Definitions for the NVM Express interface
3 * Copyright (c) 2011-2014, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 #include <uapi/linux/nvme.h>
19 #include <linux/pci.h>
20 #include <linux/kref.h>
21 #include <linux/blk-mq.h>
24 __u64 cap
; /* Controller Capabilities */
25 __u32 vs
; /* Version */
26 __u32 intms
; /* Interrupt Mask Set */
27 __u32 intmc
; /* Interrupt Mask Clear */
28 __u32 cc
; /* Controller Configuration */
29 __u32 rsvd1
; /* Reserved */
30 __u32 csts
; /* Controller Status */
31 __u32 rsvd2
; /* Reserved */
32 __u32 aqa
; /* Admin Queue Attributes */
33 __u64 asq
; /* Admin SQ Base Address */
34 __u64 acq
; /* Admin CQ Base Address */
37 #define NVME_CAP_MQES(cap) ((cap) & 0xffff)
38 #define NVME_CAP_TIMEOUT(cap) (((cap) >> 24) & 0xff)
39 #define NVME_CAP_STRIDE(cap) (((cap) >> 32) & 0xf)
40 #define NVME_CAP_MPSMIN(cap) (((cap) >> 48) & 0xf)
41 #define NVME_CAP_MPSMAX(cap) (((cap) >> 52) & 0xf)
44 NVME_CC_ENABLE
= 1 << 0,
45 NVME_CC_CSS_NVM
= 0 << 4,
46 NVME_CC_MPS_SHIFT
= 7,
47 NVME_CC_ARB_RR
= 0 << 11,
48 NVME_CC_ARB_WRRU
= 1 << 11,
49 NVME_CC_ARB_VS
= 7 << 11,
50 NVME_CC_SHN_NONE
= 0 << 14,
51 NVME_CC_SHN_NORMAL
= 1 << 14,
52 NVME_CC_SHN_ABRUPT
= 2 << 14,
53 NVME_CC_SHN_MASK
= 3 << 14,
54 NVME_CC_IOSQES
= 6 << 16,
55 NVME_CC_IOCQES
= 4 << 20,
56 NVME_CSTS_RDY
= 1 << 0,
57 NVME_CSTS_CFS
= 1 << 1,
58 NVME_CSTS_SHST_NORMAL
= 0 << 2,
59 NVME_CSTS_SHST_OCCUR
= 1 << 2,
60 NVME_CSTS_SHST_CMPLT
= 2 << 2,
61 NVME_CSTS_SHST_MASK
= 3 << 2,
64 extern unsigned char nvme_io_timeout
;
65 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
68 * Represents an NVM Express device. Each nvme_dev is a PCI function.
71 struct list_head node
;
72 struct nvme_queue
**queues
;
73 struct request_queue
*admin_q
;
74 struct blk_mq_tag_set tagset
;
75 struct blk_mq_tag_set admin_tagset
;
77 struct pci_dev
*pci_dev
;
78 struct dma_pool
*prp_page_pool
;
79 struct dma_pool
*prp_small_pool
;
82 unsigned online_queues
;
87 struct msix_entry
*entry
;
88 struct nvme_bar __iomem
*bar
;
89 struct list_head namespaces
;
91 struct device
*device
;
92 work_func_t reset_workfn
;
93 struct work_struct reset_work
;
94 struct work_struct probe_work
;
109 * An NVM Express namespace is equivalent to a SCSI LUN
112 struct list_head list
;
114 struct nvme_dev
*dev
;
115 struct request_queue
*queue
;
116 struct gendisk
*disk
;
122 u64 mode_select_num_blocks
;
123 u32 mode_select_block_len
;
127 * The nvme_iod describes the data in an I/O, including the list of PRP
128 * entries. You can't see it in this data structure because C doesn't let
129 * me express that. Use nvme_alloc_iod to ensure there's enough space
130 * allocated to store the PRP list.
133 unsigned long private; /* For the use of the submitter of the I/O */
134 int npages
; /* In the PRP list. 0 means small pool in use */
135 int offset
; /* Of PRP list */
136 int nents
; /* Used in scatterlist */
137 int length
; /* Of data, in bytes */
138 dma_addr_t first_dma
;
139 struct scatterlist meta_sg
[1]; /* metadata requires single contiguous buffer */
140 struct scatterlist sg
[0];
143 static inline u64
nvme_block_nr(struct nvme_ns
*ns
, sector_t sector
)
145 return (sector
>> (ns
->lba_shift
- 9));
149 * nvme_free_iod - frees an nvme_iod
150 * @dev: The device that the I/O was submitted to
151 * @iod: The memory to free
153 void nvme_free_iod(struct nvme_dev
*dev
, struct nvme_iod
*iod
);
155 int nvme_setup_prps(struct nvme_dev
*, struct nvme_iod
*, int, gfp_t
);
156 struct nvme_iod
*nvme_map_user_pages(struct nvme_dev
*dev
, int write
,
157 unsigned long addr
, unsigned length
);
158 void nvme_unmap_user_pages(struct nvme_dev
*dev
, int write
,
159 struct nvme_iod
*iod
);
160 int nvme_submit_io_cmd(struct nvme_dev
*, struct nvme_ns
*,
161 struct nvme_command
*, u32
*);
162 int nvme_submit_flush_data(struct nvme_queue
*nvmeq
, struct nvme_ns
*ns
);
163 int nvme_submit_admin_cmd(struct nvme_dev
*, struct nvme_command
*,
165 int nvme_identify(struct nvme_dev
*, unsigned nsid
, unsigned cns
,
166 dma_addr_t dma_addr
);
167 int nvme_get_features(struct nvme_dev
*dev
, unsigned fid
, unsigned nsid
,
168 dma_addr_t dma_addr
, u32
*result
);
169 int nvme_set_features(struct nvme_dev
*dev
, unsigned fid
, unsigned dword11
,
170 dma_addr_t dma_addr
, u32
*result
);
174 int nvme_sg_io(struct nvme_ns
*ns
, struct sg_io_hdr __user
*u_hdr
);
175 int nvme_sg_io32(struct nvme_ns
*ns
, unsigned long arg
);
176 int nvme_sg_get_version_num(int __user
*ip
);
178 #endif /* _LINUX_NVME_H */