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 <jay.e.sternberg@intel.com>
[hch: rebased, renamed core.c to pci.c, slight tweaks]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

MAINTAINERS

@@ -7448,7 +7448,7 @@ M:	Matthew Wilcox <willy@linux.intel.com>
 L:	linux-nvme@lists.infradead.org
 T:	git git://git.infradead.org/users/willy/linux-nvme.git
 S:	Supported
-F:	drivers/block/nvme*
+F:	drivers/nvme/host/
 F:	include/linux/nvme.h
 
 NVMEM FRAMEWORK

drivers/Kconfig

@@ -18,6 +18,8 @@ source "drivers/pnp/Kconfig"
 
 source "drivers/block/Kconfig"
 
+source "drivers/nvme/Kconfig"
+
 # misc before ide - BLK_DEV_SGIIOC4 depends on SGI_IOC4
 
 source "drivers/misc/Kconfig"

drivers/Makefile

@@ -70,6 +70,7 @@ obj-$(CONFIG_NUBUS)		+= nubus/
 obj-y				+= macintosh/
 obj-$(CONFIG_IDE)		+= ide/
 obj-$(CONFIG_SCSI)		+= scsi/
+obj-y				+= nvme/
 obj-$(CONFIG_ATA)		+= ata/
 obj-$(CONFIG_TARGET_CORE)	+= target/
 obj-$(CONFIG_MTD)		+= mtd/

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/nvme/Kconfig

+source "drivers/nvme/host/Kconfig"

drivers/nvme/Makefile

+
+obj-y		+= host/

drivers/nvme/host/Kconfig

+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.

drivers/nvme/host/Makefile

+
+obj-$(CONFIG_BLK_DEV_NVME)     += nvme.o
+
+nvme-y		+= pci.o scsi.o