nvme: move to a new drivers/nvme/host directory

This patch moves the NVMe driver from drivers/block/ to its own new
drivers/nvme/host/ directory.  This is in preparation of splitting the
current monolithic driver up and add support for the upcoming NVMe
over Fabrics standard.  The drivers/nvme/host/ is chose to leave space
for a NVMe target implementation in addition to this host side driver.

Signed-off-by: Jay Sternberg <[email protected]>
[hch: rebased, renamed core.c to pci.c, slight tweaks]
Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Keith Busch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

drivers/block/Kconfig

@@ -310,17 +310,6 @@ config BLK_DEV_NBD
 
 	  If unsure, say N.
 
-config BLK_DEV_NVME
-	tristate "NVM Express block device"
-	depends on PCI
-	---help---
-	  The NVM Express driver is for solid state drives directly
-	  connected to the PCI or PCI Express bus.  If you know you
-	  don't have one of these, it is safe to answer N.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called nvme.
-
 config BLK_DEV_SKD
 	tristate "STEC S1120 Block Driver"
 	depends on PCI

drivers/block/Makefile

@@ -22,7 +22,6 @@ obj-$(CONFIG_XILINX_SYSACE)	+= xsysace.o
 obj-$(CONFIG_CDROM_PKTCDVD)	+= pktcdvd.o
 obj-$(CONFIG_MG_DISK)		+= mg_disk.o
 obj-$(CONFIG_SUNVDC)		+= sunvdc.o
-obj-$(CONFIG_BLK_DEV_NVME)	+= nvme.o
 obj-$(CONFIG_BLK_DEV_SKD)	+= skd.o
 obj-$(CONFIG_BLK_DEV_OSD)	+= osdblk.o
 
@@ -44,6 +43,5 @@ obj-$(CONFIG_BLK_DEV_RSXX) += rsxx/
 obj-$(CONFIG_BLK_DEV_NULL_BLK)	+= null_blk.o
 obj-$(CONFIG_ZRAM) += zram/
 
-nvme-y		:= nvme-core.o nvme-scsi.o
 skd-y		:= skd_main.o
 swim_mod-y	:= swim.o swim_asm.o

drivers/block/nvme.h

@@ -1,133 +0,0 @@
-/*
- * 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)
-
-/*
- * 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;
-	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);
-
-#endif /* _NVME_H */