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Thorsten Leemhuis 720639ef01 nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs commit `538e4a8c57` upstream. Some Kingston A2000 NVMe SSDs sooner or later get confused and stop working when they use the deepest APST sleep while running Linux. The system then crashes and one has to cold boot it to get the SSD working again. Kingston seems to known about this since at least mid-September 2020: https://bbs.archlinux.org/viewtopic.php?pid=1926994#p1926994 Someone working for a German company representing Kingston to the German press confirmed to me Kingston engineering is aware of the issue and investigating; the person stated that to their current knowledge only the deepest APST sleep state causes trouble. Therefore, make Linux avoid it for now by applying the NVME_QUIRK_NO_DEEPEST_PS to this SSD. I have two such SSDs, but it seems the problem doesn't occur with them. I hence couldn't verify if this patch really fixes the problem, but all the data in front of me suggests it should. This patch can easily be reverted or improved upon if a better solution surfaces. FWIW, there are many reports about the issue scattered around the web; most of the users disabled APST completely to make things work, some just made Linux avoid the deepest sleep state: https://bugzilla.kernel.org/show_bug.cgi?id=195039#c65 https://bugzilla.kernel.org/show_bug.cgi?id=195039#c73 https://bugzilla.kernel.org/show_bug.cgi?id=195039#c74 https://bugzilla.kernel.org/show_bug.cgi?id=195039#c78 https://bugzilla.kernel.org/show_bug.cgi?id=195039#c79 https://bugzilla.kernel.org/show_bug.cgi?id=195039#c80 https://askubuntu.com/questions/1222049/nvmekingston-a2000-sometimes-stops-giving-response-in-ubuntu-18-04dell-inspir https://community.acer.com/en/discussion/604326/m-2-nvme-ssd-aspire-517-51g-issue-compatibility-kingston-a2000-linux-ubuntu For the record, some data from 'nvme id-ctrl /dev/nvme0' NVME Identify Controller: vid : 0x2646 ssvid : 0x2646 mn : KINGSTON SA2000M81000G fr : S5Z42105 [...] ps 0 : mp:9.00W operational enlat:0 exlat:0 rrt:0 rrl:0 rwt:0 rwl:0 idle_power:- active_power:- ps 1 : mp:4.60W operational enlat:0 exlat:0 rrt:1 rrl:1 rwt:1 rwl:1 idle_power:- active_power:- ps 2 : mp:3.80W operational enlat:0 exlat:0 rrt:2 rrl:2 rwt:2 rwl:2 idle_power:- active_power:- ps 3 : mp:0.0450W non-operational enlat:2000 exlat:2000 rrt:3 rrl:3 rwt:3 rwl:3 idle_power:- active_power:- ps 4 : mp:0.0040W non-operational enlat:15000 exlat:15000 rrt:4 rrl:4 rwt:4 rwl:4 idle_power:- active_power:- Cc: stable@vger.kernel.org # 4.14+ Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-02-10 09:29:19 +01:00
arch	Fix unsynchronized access to sev members through svm_register_enc_region	2021-02-10 09:29:18 +01:00
block	blk-mq: test QUEUE_FLAG_HCTX_ACTIVE for sbitmap_shared in hctx_may_queue	2021-02-03 23:28:44 +01:00
certs	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
crypto	crypto: xor - Fix divide error in do_xor_speed()	2021-01-27 11:54:52 +01:00
Documentation	ovl: implement volatile-specific fsync error behaviour	2021-02-10 09:29:16 +01:00
drivers	nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs	2021-02-10 09:29:19 +01:00
fs	io_uring: don't modify identity's files uncess identity is cowed	2021-02-10 09:29:19 +01:00
include	drm/dp/mst: Export drm_dp_get_vc_payload_bw()	2021-02-10 09:29:18 +01:00
init	fgraph: Initialize tracing_graph_pause at task creation	2021-02-10 09:29:16 +01:00
ipc	ipc: adjust proc_ipc_sem_dointvec definition to match prototype	2020-09-05 12:14:29 -07:00
kernel	genirq/msi: Activate Multi-MSI early when MSI_FLAG_ACTIVATE_EARLY is set	2021-02-10 09:29:17 +01:00
lib	iov_iter: fix the uaccess area in copy_compat_iovec_from_user	2021-01-27 11:55:09 +01:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	memblock: do not start bottom-up allocations with kernel_end	2021-02-10 09:29:15 +01:00
net	mac80211: fix station rate table updates on assoc	2021-02-10 09:29:16 +01:00
samples	samples/bpf: Fix possible hang in xdpsock with multiple threads	2020-12-30 11:53:49 +01:00
scripts	scripts: use pkg-config to locate libcrypto	2021-02-10 09:29:17 +01:00
security	dump_common_audit_data(): fix racy accesses to ->d_name	2021-01-19 18:27:29 +01:00
sound	ALSA: hda: Add Cometlake-R PCI ID	2021-02-07 15:37:15 +01:00
tools	objtool: Don't fail the kernel build on fatal errors	2021-02-07 15:37:17 +01:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	KVM: Forbid the use of tagged userspace addresses for memslots	2021-02-03 23:28:41 +01:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-12-10 15:30:13 -08:00
Makefile	kbuild: fix duplicated flags in DEBUG_CFLAGS	2021-02-10 09:29:15 +01:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.