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1/*
2 * Definitions for the NVM Express interface
3 * Copyright (c) 2011-2013, Intel Corporation.
4 *
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.
8 *
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
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19#ifndef _LINUX_NVME_H
20#define _LINUX_NVME_H
21
22#include <uapi/linux/nvme.h>
23#include <linux/pci.h>
24#include <linux/miscdevice.h>
25#include <linux/kref.h>
26
27struct nvme_bar {
28 __u64 cap; /* Controller Capabilities */
29 __u32 vs; /* Version */
30 __u32 intms; /* Interrupt Mask Set */
31 __u32 intmc; /* Interrupt Mask Clear */
32 __u32 cc; /* Controller Configuration */
33 __u32 rsvd1; /* Reserved */
34 __u32 csts; /* Controller Status */
35 __u32 rsvd2; /* Reserved */
36 __u32 aqa; /* Admin Queue Attributes */
37 __u64 asq; /* Admin SQ Base Address */
38 __u64 acq; /* Admin CQ Base Address */
39};
40
41#define NVME_CAP_MQES(cap) ((cap) & 0xffff)
42#define NVME_CAP_TIMEOUT(cap) (((cap) >> 24) & 0xff)
43#define NVME_CAP_STRIDE(cap) (((cap) >> 32) & 0xf)
44#define NVME_CAP_MPSMIN(cap) (((cap) >> 48) & 0xf)
45
46enum {
47 NVME_CC_ENABLE = 1 << 0,
48 NVME_CC_CSS_NVM = 0 << 4,
49 NVME_CC_MPS_SHIFT = 7,
50 NVME_CC_ARB_RR = 0 << 11,
51 NVME_CC_ARB_WRRU = 1 << 11,
52 NVME_CC_ARB_VS = 7 << 11,
53 NVME_CC_SHN_NONE = 0 << 14,
54 NVME_CC_SHN_NORMAL = 1 << 14,
55 NVME_CC_SHN_ABRUPT = 2 << 14,
56 NVME_CC_SHN_MASK = 3 << 14,
57 NVME_CC_IOSQES = 6 << 16,
58 NVME_CC_IOCQES = 4 << 20,
59 NVME_CSTS_RDY = 1 << 0,
60 NVME_CSTS_CFS = 1 << 1,
61 NVME_CSTS_SHST_NORMAL = 0 << 2,
62 NVME_CSTS_SHST_OCCUR = 1 << 2,
63 NVME_CSTS_SHST_CMPLT = 2 << 2,
64 NVME_CSTS_SHST_MASK = 3 << 2,
65};
66
67#define NVME_VS(major, minor) (major << 16 | minor)
68
69#define NVME_IO_TIMEOUT (5 * HZ)
70
71/*
72 * Represents an NVM Express device. Each nvme_dev is a PCI function.
73 */
74struct nvme_dev {
75 struct list_head node;
76 struct nvme_queue **queues;
77 u32 __iomem *dbs;
78 struct pci_dev *pci_dev;
79 struct dma_pool *prp_page_pool;
80 struct dma_pool *prp_small_pool;
81 int instance;
82 int queue_count;
83 u32 db_stride;
84 u32 ctrl_config;
85 struct msix_entry *entry;
86 struct nvme_bar __iomem *bar;
87 struct list_head namespaces;
88 struct kref kref;
89 struct miscdevice miscdev;
90 struct work_struct reset_work;
91 char name[12];
92 char serial[20];
93 char model[40];
94 char firmware_rev[8];
95 u32 max_hw_sectors;
96 u32 stripe_size;
97 u16 oncs;
98 u16 abort_limit;
99 u8 initialized;
100};
101
102/*
103 * An NVM Express namespace is equivalent to a SCSI LUN
104 */
105struct nvme_ns {
106 struct list_head list;
107
108 struct nvme_dev *dev;
109 struct request_queue *queue;
110 struct gendisk *disk;
111
112 unsigned ns_id;
113 int lba_shift;
114 int ms;
115 u64 mode_select_num_blocks;
116 u32 mode_select_block_len;
117};
118
119/*
120 * The nvme_iod describes the data in an I/O, including the list of PRP
121 * entries. You can't see it in this data structure because C doesn't let
122 * me express that. Use nvme_alloc_iod to ensure there's enough space
123 * allocated to store the PRP list.
124 */
125struct nvme_iod {
126 void *private; /* For the use of the submitter of the I/O */
127 int npages; /* In the PRP list. 0 means small pool in use */
128 int offset; /* Of PRP list */
129 int nents; /* Used in scatterlist */
130 int length; /* Of data, in bytes */
131 unsigned long start_time;
132 dma_addr_t first_dma;
133 struct scatterlist sg[0];
134};
135
136static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
137{
138 return (sector >> (ns->lba_shift - 9));
139}
140
141/**
142 * nvme_free_iod - frees an nvme_iod
143 * @dev: The device that the I/O was submitted to
144 * @iod: The memory to free
145 */
146void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod);
147
148int nvme_setup_prps(struct nvme_dev *dev, struct nvme_common_command *cmd,
149 struct nvme_iod *iod, int total_len, gfp_t gfp);
150struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
151 unsigned long addr, unsigned length);
152void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
153 struct nvme_iod *iod);
154struct nvme_queue *get_nvmeq(struct nvme_dev *dev);
155void put_nvmeq(struct nvme_queue *nvmeq);
156int nvme_submit_sync_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
157 u32 *result, unsigned timeout);
158int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns);
159int nvme_submit_admin_cmd(struct nvme_dev *, struct nvme_command *,
160 u32 *result);
161int nvme_identify(struct nvme_dev *, unsigned nsid, unsigned cns,
162 dma_addr_t dma_addr);
163int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
164 dma_addr_t dma_addr, u32 *result);
165int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
166 dma_addr_t dma_addr, u32 *result);
167
168struct sg_io_hdr;
169
170int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
171int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
172int nvme_sg_get_version_num(int __user *ip);
173
174#endif /* _LINUX_NVME_H */