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2014-01-27NVMe: Abort timed out commandsKeith Busch1-0/+1
Send nvme abort command to io requests that have timed out on an initialized device. If the command is not returned after another timeout, schedule the controller for reset. Signed-off-by: Keith Busch <keith.busch@intel.com> [fix endianness issues] Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2014-01-27NVMe: Schedule reset for failed controllersKeith Busch1-0/+1
Schedules a controller reset when it indicates it has a failed status. If the device does not become ready after a reset, the pci device will be scheduled for removal. Signed-off-by: Keith Busch <keith.busch@intel.com> [fixed checkpatch issue] Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-12-16NVMe: Device resume error handlingKeith Busch1-0/+1
Adds controller error handling on resume power management. If the device fails to initialize, the device is queued for a reset. If the reset fails, a thread is spawned to remove the pci device. If the device resumes as "busy", the device is responding to admin commands but will not create IO queues. In this case, we need to remove the gendisks and free the IO queues since they can't be used and may be holding bios in their lists. From testing, the dma pools require a pci device so this had to change the pci driver 'remove' to release the dma resources in line with that call instead of after all references to the device are released. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-12-16NVMe: compat SG_IO ioctlKeith Busch1-0/+1
For 32-bit versions of sg3-utils running on a 64-bit system. This is mostly a copy from the relevent portions of fs/compat_ioctl.c, with slight modifications for going through block_device_operations. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Vishal Verma <vishal.l.verma@linux.intel.com> [fixed up CONFIG_COMPAT=n build problems] Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-11-18NVMe: Avoid shift operation when writing cq head doorbellHaiyan Hu1-1/+1
Changes the type of dev->db_stride to unsigned and changes the value stored there to be 1 << the current value. Then there is less calculation to be done at completion time. Signed-off-by: Haiyan Hu <huhaiyan@huawei.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-09-03NVMe: Use normal shutdownKeith Busch1-0/+2
The NVMe spec recommends using the shutdown normal sequence when safely taking the controller offline instead of hitting CC.EN on the next start-up to reset the controller. The spec recommends a minimum of 1 second for the shutdown complete. This patch waits 2 seconds to be on the safe side. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-09-03NVMe: Namespace IDs are unsignedMatthew Wilcox1-1/+1
The 'Number of Namespaces' read from the device was being treated as signed, which would cause us to not scan any namespaces for a device with more than 2 billion namespaces. That led to noticing that the namespace ID was also being treated as signed, which could lead to the result from NVME_IOCTL_ID being treated as an error code. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-09-03NVMe: Split header file into user-visible and kernel-visible piecesMatthew Wilcox1-456/+5
To build user programs that call the NVMe ioctls, we need to have a user header file. Catch up to the new way of doing that by splitting the header file into kernel and uapi portions. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-06-20NVMe: Disk IO statisticsKeith Busch1-0/+1
Add io stats accounting for bio requests so nvme block devices show useful disk stats. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-05-08NVMe: Simplify Firmware Activate code slightlyMatthew Wilcox1-0/+3
Add definitions for the three Firmware Activate actions, and change the SCSI translation code to construct the command into a temporary variable instead of translating the endianness back-and-forth. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Reviewed-by: Vishal Verma <vishal.l.verma@linux.intel.com>
2013-05-02NVMe: Meta-data support in NVME_IOCTL_SUBMIT_IOKeith Busch1-0/+1
This adds support for namespaces with separate meta-data formats in the submit io ioctl. The meta-data buffer has to be a contiguous, so such a buffer is allocated and the mapped user pages are copied to/from this buffer for write/read commands. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-05-02NVMe: Device specific stripe size handlingKeith Busch1-0/+1
We have an nvme device that has a concept of a stripe size. IO requests that do not transfer data crossing a stripe boundary has greater performance compared to IO that does cross it. This patch sets the stripe size for the device if the device and vendor ids match one with this feature and splits IO requests that cross the stripe boundary. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-04-16NVMe: Add a character device for each nvme deviceKeith Busch1-0/+5
Registers a miscellaneous device for each nvme controller probed. This creates character device files as /dev/nvmeN, where N is the device instance, and supports nvme admin ioctl commands so devices without namespaces can be managed. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-04-16NVMe: Fix endian-related problems in user I/O submission pathMatthew Wilcox1-2/+2
When constructing the command, dsmgmt needs to be treated as a 32-bit value, not a 16-bit value. reftag, apptag and appmask all need to be converted from native-endian to little-endian. Again, sparse's bitwise warnings caught this problem. Thanks to Keith for pointing out the correct way to fix the reftag. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Acked-by: Keith Busch <keith.busch@intel.com>
2013-04-16NVMe: Abstract out sector to block number conversionMatthew Wilcox1-0/+5
Introduce nvme_block_nr() to help convert sectors to block numbers. This fixes an integer overflow in the SCSI conversion layer, and it's slightly less typing than opencoding it. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Acked-by: Keith Busch <keith.busch@intel.com>
2013-03-28NVMe: Add nvme-scsi.cVishal Verma1-0/+35
Translates SCSI commands in SG_IO ioctl to NVMe commands. Uses the scsi-nvme translation spec from nvmexpress.org as reference. Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-03-27NVMe: Add definitions for format commandVishal Verma1-0/+12
The SCSI emulation has the ability to send format commands, so we need to add the definition of the command. Also add a missing error code. Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-03-27NVMe: Move structures & definitions to header fileVishal Verma1-0/+60
nvme-scsi.c uses several data structures and definitions that were previously private to nvme-core.c. Move the definitions to nvme.h, protected by __KERNEL__. Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2013-03-26NVMe: Add discard support for capable devicesKeith Busch1-0/+32
This adds discard support to block queues if the nvme device is capable of deallocating blocks as indicated by the controller's optional command support. A discard flagged bio request will submit an NVMe deallocate Data Set Management command for the requested blocks. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2012-11-13NVMe: Define SMART logKeith Busch1-0/+28
This data structure is defined in the NVMe specification. It's not used by the kernel, but is available for use by userspace software. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2012-07-27NVMe: Do not set IO queue depth beyond device maxKeith Busch1-0/+1
Set the depth for IO queues to the device's maximum supported queue entries if the requested depth exceeds the device's capabilities. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2012-07-26NVMe: Set block queue max sectorsKeith Busch1-0/+1
Set the max hw sectors in a namespace's request queue if the nvme device has a max data transfer size. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Update Identify Controller data structureMatthew Wilcox1-5/+22
The driver was still using an old definition of Identify Controller which only came to light once we started using the 'number of namespaces' field properly. Reported-by: Nisheeth Bhat <nisheeth.bhat@intel.com> Reported-by: Khosrow Panah <Khosrow.Panah@idt.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Implement doorbell stride capabilityMatthew Wilcox1-0/+1
The doorbell stride allows devices to spread out their doorbells instead of packing them tightly. This feature was added as part of ECN 003. This patch also enables support for more than 512 queues :-) Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Rework ioctlsMatthew Wilcox1-11/+23
Remove the special-purpose IDENTIFY, GET_RANGE_TYPE, DOWNLOAD_FIRMWARE and ACTIVATE_FIRMWARE commands. Replace them with a generic ADMIN_CMD ioctl that can submit any admin command. Add a new ID ioctl that returns the namespace ID of the queried device. It corresponds to the SCSI Idlun ioctl. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Time out initialisation after a few secondsMatthew Wilcox1-0/+2
THe device reports (in its capability register) how long it will take to initialise. If that time elapses before the ready bit becomes set, conclude the device is broken and refuse to initialise it. Log a nice error message so the user knows why we did nothing. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Correct the Controller Configuration settingsMatthew Wilcox1-4/+6
The arbitration field was extended by one bit, shifting the shutdown notification bits by one. Also, the SQ/CQ entry size was made configurable for future extensions. Reported-by: Paul Luse <paul.e.luse@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Change the definition of nvme_user_ioMatthew Wilcox1-5/+3
The read and write commands don't define a 'result', so there's no need to copy it back to userspace. Remove the ability of the ioctl to submit commands to a different namespace; it's just asking for trouble, and the use case I have in mind will be addressed througha different ioctl in the future. That removes the need for both the block_shift and nsid arguments. Check that the opcode is one of 'read' or 'write'. Future opcodes may be added in the future, but we will need a different structure definition for them. The nblocks field is redefined to be 0-based. This allows the user to request the full 65536 blocks. Don't byteswap the reftag, apptag and appmask. Martin Petersen tells me these are calculated in big-endian and are transmitted to the device in big-endian. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Correct the definitions of two ioctlsMatthew Wilcox1-2/+2
NVME_IOCTL_SUBMIT_IO has a struct nvme_user_io, not a struct nvme_rw_command as a parameter, and NVME_IOCTL_DOWNLOAD_FW is a Write, not a Read. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Remove outdated commentsMatthew Wilcox1-1/+0
The head can never overrun the tail since we won't allocate enough command IDs to let that happen. The status codes are in sync with the spec. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Update admin opcodes to match the 1.0RC specKrzysztof Wierzbicki1-7/+7
Signed-off-by: Krzysztof Wierzbicki <krzysztof.wierzbicki@intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Update BAR structure to match the current specMatthew Wilcox1-2/+4
Add two reserved registers in the middle of the BAR to match the 1.0 spec plus ECN 0002. Also rename IMC and ISC to INTMC and INTSC to conform with the spec. We still don't need to use them :-) Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Add download / activate firmware ioctlsMatthew Wilcox1-6/+27
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Add remaining status codesMatthew Wilcox1-0/+15
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Add NVME_IOCTL_SUBMIT_IOMatthew Wilcox1-0/+18
Allow userspace to submit synchronous I/O like the SCSI sg interface does. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: Make nvme_common_command more featurefulMatthew Wilcox1-8/+12
Add prp1, prp2 and the metadata prp to the common command, since the fields are generally used this way. Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
2011-11-04NVMe: New driverMatthew Wilcox1-0/+343
This driver is for devices that follow the NVM Express standard Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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