user/sven/linux.git/include/linux/nvme.h, branch v3.18.22

NVMe: Fix hot cpu notification dead lock

2014-06-13T14:43:34Z

There is a potential dead lock if a cpu event occurs during nvme probe since it registered with hot cpu notification. This fixes the race by having the module register with notification outside of probe rather than have each device register. The actual work is done in a scheduled work queue instead of in the notifier since assigning IO queues has the potential to block if the driver creates additional queues. Signed-off-by: Keith Busch Signed-off-by: Matthew Wilcox

NVMe: Rename io_timeout to nvme_io_timeout

2014-06-04T03:04:30Z

It's positively immoral to have a global variable called 'io_timeout'. Keep the module parameter called io_timeout, though. Signed-off-by: Matthew Wilcox

NVMe: Flush with data support

2014-05-05T14:54:02Z

It is possible a filesystem may send a flush flagged bio with write data. There is no such composite NVMe command, so the driver sends flush and write separately. The device is allowed to execute these commands in any order, so it was possible the driver ends the bio after the write completes, but while the flush is still active. We don't want to let a filesystem believe flush succeeded before it really has; this could cause data corruption on a power loss between these events. To fix, this patch splits the flush and write into chained bios. Signed-off-by: Keith Busch Signed-off-by: Matthew Wilcox

NVMe: Configure support for block flush

2014-05-05T14:53:53Z

This configures an nvme request_queue as flush capable if the device has a volatile write cache present. Signed-off-by: Keith Busch Signed-off-by: Matthew Wilcox

NVMe: Update copyright headers

2014-05-05T14:41:25Z

Make the copyright dates accurate and remove the final paragraph that includes the address of the FSF. Signed-off-by: Matthew Wilcox

Merge git://git.infradead.org/users/willy/linux-nvme

2014-04-11T23:45:59Z

Pull NVMe driver updates from Matthew Wilcox: "Various updates to the NVMe driver. The most user-visible change is that drive hotplugging now works and CPU hotplug while an NVMe drive is installed should also work better" * git://git.infradead.org/users/willy/linux-nvme: NVMe: Retry failed commands with non-fatal errors NVMe: Add getgeo to block ops NVMe: Start-stop nvme_thread during device add-remove. NVMe: Make I/O timeout a module parameter NVMe: CPU hot plug notification NVMe: per-cpu io queues NVMe: Replace DEFINE_PCI_DEVICE_TABLE NVMe: Fix divide-by-zero in nvme_trans_io_get_num_cmds NVMe: IOCTL path RCU protect queue access NVMe: RCU protected access to io queues NVMe: Initialize device reference count earlier NVMe: Add CONFIG_PM_SLEEP to suspend/resume functions

NVMe: Retry failed commands with non-fatal errors

2014-04-10T21:11:59Z

For commands returned with failed status, queue these for resubmission and continue retrying them until success or for a limited amount of time. The final timeout was arbitrarily chosen so requests can't be retried indefinitely. Since these are requeued on the nvmeq that submitted the command, the callbacks have to take an nvmeq instead of an nvme_dev as a parameter so that we can use the locked queue to append the iod to retry later. The nvme_iod conviently can be used to track how long we've been trying to successfully complete an iod request. The nvme_iod also provides the nvme prp dma mappings, so I had to move a few things around so we can keep those mappings. Signed-off-by: Keith Busch [fixed checkpatch issue with long line] Signed-off-by: Matthew Wilcox

NVMe: Make I/O timeout a module parameter

2014-04-10T21:04:38Z

Increase the default timeout to 30 seconds to match SCSI. Signed-off-by: Keith Busch [use byte instead of ushort] Signed-off-by: Matthew Wilcox

NVMe: CPU hot plug notification

2014-04-10T21:03:42Z

Registers with hot cpu notification to rebalance, and potentially allocate additional, io queues. Signed-off-by: Keith Busch Signed-off-by: Matthew Wilcox

NVMe: per-cpu io queues

2014-04-10T21:03:15Z

The device's IO queues are associated with CPUs, so we can use a per-cpu variable to map the a qid to a cpu. This provides a convienient way to optimally assign queues to multiple cpus when the device supports fewer queues than the host has cpus. The previous implementation may have assigned these poorly in these situations. This patch addresses this by sharing queues among cpus that are "close" together and should have a lower lock contention penalty. Signed-off-by: Keith Busch Signed-off-by: Matthew Wilcox