1 /* 2 * Copyright (c) 2011-2014, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 */ 13 14 #ifndef _NVME_H 15 #define _NVME_H 16 17 #include <linux/nvme.h> 18 #include <linux/pci.h> 19 #include <linux/kref.h> 20 #include <linux/blk-mq.h> 21 22 extern unsigned char nvme_io_timeout; 23 #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) 24 25 enum { 26 NVME_NS_LBA = 0, 27 NVME_NS_LIGHTNVM = 1, 28 }; 29 30 /* 31 * Represents an NVM Express device. Each nvme_dev is a PCI function. 32 */ 33 struct nvme_dev { 34 struct list_head node; 35 struct nvme_queue **queues; 36 struct request_queue *admin_q; 37 struct blk_mq_tag_set tagset; 38 struct blk_mq_tag_set admin_tagset; 39 u32 __iomem *dbs; 40 struct device *dev; 41 struct dma_pool *prp_page_pool; 42 struct dma_pool *prp_small_pool; 43 int instance; 44 unsigned queue_count; 45 unsigned online_queues; 46 unsigned max_qid; 47 int q_depth; 48 u32 db_stride; 49 u32 ctrl_config; 50 struct msix_entry *entry; 51 struct nvme_bar __iomem *bar; 52 struct list_head namespaces; 53 struct kref kref; 54 struct device *device; 55 struct work_struct reset_work; 56 struct work_struct probe_work; 57 struct work_struct scan_work; 58 char name[12]; 59 char serial[20]; 60 char model[40]; 61 char firmware_rev[8]; 62 bool subsystem; 63 u32 max_hw_sectors; 64 u32 stripe_size; 65 u32 page_size; 66 void __iomem *cmb; 67 dma_addr_t cmb_dma_addr; 68 u64 cmb_size; 69 u32 cmbsz; 70 u16 oncs; 71 u16 abort_limit; 72 u8 event_limit; 73 u8 vwc; 74 }; 75 76 /* 77 * An NVM Express namespace is equivalent to a SCSI LUN 78 */ 79 struct nvme_ns { 80 struct list_head list; 81 82 struct nvme_dev *dev; 83 struct request_queue *queue; 84 struct gendisk *disk; 85 struct kref kref; 86 87 unsigned ns_id; 88 int lba_shift; 89 u16 ms; 90 bool ext; 91 u8 pi_type; 92 int type; 93 u64 mode_select_num_blocks; 94 u32 mode_select_block_len; 95 }; 96 97 /* 98 * The nvme_iod describes the data in an I/O, including the list of PRP 99 * entries. You can't see it in this data structure because C doesn't let 100 * me express that. Use nvme_alloc_iod to ensure there's enough space 101 * allocated to store the PRP list. 102 */ 103 struct nvme_iod { 104 unsigned long private; /* For the use of the submitter of the I/O */ 105 int npages; /* In the PRP list. 0 means small pool in use */ 106 int offset; /* Of PRP list */ 107 int nents; /* Used in scatterlist */ 108 int length; /* Of data, in bytes */ 109 dma_addr_t first_dma; 110 struct scatterlist meta_sg[1]; /* metadata requires single contiguous buffer */ 111 struct scatterlist sg[0]; 112 }; 113 114 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector) 115 { 116 return (sector >> (ns->lba_shift - 9)); 117 } 118 119 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 120 void *buf, unsigned bufflen); 121 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 122 void *buffer, void __user *ubuffer, unsigned bufflen, 123 u32 *result, unsigned timeout); 124 int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id); 125 int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid, 126 struct nvme_id_ns **id); 127 int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log); 128 int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, 129 dma_addr_t dma_addr, u32 *result); 130 int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, 131 dma_addr_t dma_addr, u32 *result); 132 133 struct sg_io_hdr; 134 135 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr); 136 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg); 137 int nvme_sg_get_version_num(int __user *ip); 138 139 #ifdef CONFIG_NVM 140 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id); 141 int nvme_nvm_register(struct request_queue *q, char *disk_name); 142 void nvme_nvm_unregister(struct request_queue *q, char *disk_name); 143 #else 144 static inline int nvme_nvm_register(struct request_queue *q, char *disk_name) 145 { 146 return 0; 147 } 148 149 static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {}; 150 151 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id) 152 { 153 return 0; 154 } 155 #endif /* CONFIG_NVM */ 156 157 #endif /* _NVME_H */ 158