linux-toradex.git/drivers/nvme/host/nvme.h, branch v5.3-rc1

nvme: set physical block size and optimal I/O size

2019-07-09T21:15:37+00:00

>From the NVMe 1.4 spec:

NSFEAT bit 4 if set to 1: indicates that the fields NPWG, NPWA, NPDG, NPDA,
and NOWS are defined for this namespace and should be used by the host for
I/O optimization;
[ ... ]
Namespace Preferred Write Granularity (NPWG): This field indicates the
smallest recommended write granularity in logical blocks for this namespace.
This is a 0's based value. The size indicated should be less than or equal
to Maximum Data Transfer Size (MDTS) that is specified in units of minimum
memory page size. The value of this field may change if the namespace is
reformatted. The size should be a multiple of Namespace Preferred Write
Alignment (NPWA). Refer to section 8.25 for how this field is utilized to
improve performance and endurance.
[ ... ]
Each Write, Write Uncorrectable, or Write Zeroes commands should address a
multiple of Namespace Preferred Write Granularity (NPWG) (refer to Figure
245) and Stream Write Size (SWS) (refer to Figure 515) logical blocks (as
expressed in the NLB field), and the SLBA field of the command should be
aligned to Namespace Preferred Write Alignment (NPWA) (refer to Figure 245)
for best performance.

Signed-off-by: Bart Van Assche 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Christoph Hellwig

nvme: enable to inject errors into admin commands

2019-06-21T09:15:50+00:00

This enables to inject errors into the commands submitted to the admin
queue.

It is useful to test error handling in the controller initialization.

	# echo 100 > /sys/kernel/debug/nvme0/fault_inject/probability
	# echo 1 > /sys/kernel/debug/nvme0/fault_inject/times
	# echo 10 > /sys/kernel/debug/nvme0/fault_inject/space
	# nvme reset /dev/nvme0
	# dmesg
	...
	nvme nvme0: Could not set queue count (16385)
	nvme nvme0: IO queues not created

Signed-off-by: Akinobu Mita 
Reviewed-by: Minwoo Im 
Reviewed-by: Sagi Grimberg 
Reviewed-by: Chaitanya Kulkarni 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Christoph Hellwig

nvme: prepare for fault injection into admin commands

2019-06-21T09:15:50+00:00

Currenlty fault injection support for nvme only enables to inject errors
into the commands submitted to I/O queues.

In preparation for fault injection into the admin commands, this makes
the helper functions independent of struct nvme_ns.

Signed-off-by: Akinobu Mita 
Reviewed-by: Minwoo Im 
Reviewed-by: Sagi Grimberg 
Reviewed-by: Chaitanya Kulkarni 
Signed-off-by: Christoph Hellwig

nvme: export get and set features

2019-06-21T09:08:38+00:00

Future use intends to make use of both, so export these functions. And
since their implementation is identical except for the opcode, provide a
new function that implement both.

[akinobu.mita@gmail.com>: fix line over 80 characters]
Signed-off-by: Keith Busch 
Signed-off-by: Akinobu Mita 
Reviewed-by: Chaitanya Kulkarni 
Reviewed-by: Minwoo Im 
Signed-off-by: Sagi Grimberg 
Signed-off-by: Christoph Hellwig

nvme-pci: Sync queues on reset

2019-05-17T17:04:34+00:00

A controller with multiple namespaces may have multiple request_queues with
their own timeout work. If a controller fails with IO outstanding to
diffent namespaces, each request queue may attempt to handle it, so
ensure there is no previously scheduled timeout work executing prior to
starting controller initialization by synchronizing with each queue.

Reviewed-by: Minwoo Im 
Reviewed-by: Ming Lei 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Keith Busch

nvme: mark nvme_core_init and nvme_core_exit static

2019-05-01T13:18:47+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Bart Van Assche 
Reviewed-by: Keith Busch 
Reviewed-by: Chaitanya Kulkarni

nvme: disable Write Zeroes for qemu controllers

2019-03-13T18:57:34+00:00

Qemu started out with a broken implementation of Write Zeroes written
by yours truly.  Disable Write Zeroes on qemu for now, eventually
we need to go back and make all the qemu quirks version specific,
but that is left for another time.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Keith Busch 
Tested-by: Ming Lei 
Signed-off-by: Jens Axboe

nvme: convert to SPDX identifiers

2019-02-20T14:22:28+00:00

Update license to use SPDX-License-Identifier instead of verbose license
text.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Sagi Grimberg

nvme: unexport nvme_delete_ctrl_sync()

2019-02-20T14:18:15+00:00

Since nvme_delete_ctrl_sync() is not called from any other kernel module,
unexport it.

Signed-off-by: Bart Van Assche 
Reviewed-by: Sagi Grimberg 
Reviewed-by: Chaitanya Kulkarni 
Signed-off-by: Christoph Hellwig

nvme-multipath: round-robin I/O policy

2019-02-20T14:17:49+00:00

Implement a simple round-robin I/O policy for multipathing.  Path
selection is done in two rounds, first iterating across all optimized
paths, and if that doesn't return any valid paths, iterate over all
optimized and non-optimized paths.  If no paths are found, use the
existing algorithm.  Also add a sysfs attribute 'iopolicy' to switch
between the current NUMA-aware I/O policy and the 'round-robin' I/O
policy.

Signed-off-by: Hannes Reinecke 
Signed-off-by: Christoph Hellwig