€•õ9      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ1/translations/zh_CN/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/zh_TW/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/it_IT/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/ja_JP/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/ko_KR/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/pt_BR/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ1/translations/sp_SP/nvme/feature-and-quirk-policy”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh·sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1hµhhh²hh³ŒK/var/lib/git/docbuild/linux/Documentation/nvme/feature-and-quirk-policy.rst”h´KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ#Linux NVMe feature and quirk policy”h]”hŒ#Linux NVMe feature and quirk policy”…””}”(hhÏh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhÊh²hh³hÇh´KubhŒ	paragraph”“”)”}”(hŒhThis file explains the policy used to decide what is supported by the
Linux NVMe driver and what is not.”h]”hŒhThis file explains the policy used to decide what is supported by the
Linux NVMe driver and what is not.”…””}”(hhßh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KhhÊh²hubhÉ)”}”(hhh]”(hÎ)”}”(hŒIntroduction”h]”hŒIntroduction”…””}”(hhðh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhíh²hh³hÇh´KubhÞ)”}”(hŒ?NVM Express is an open collection of standards and information.”h]”hŒ?NVM Express is an open collection of standards and information.”…””}”(hhþh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khhíh²hubhÞ)”}”(hŒ²The Linux NVMe host driver in drivers/nvme/host/ supports devices
implementing the NVM Express (NVMe) family of specifications, which
currently consists of a number of documents:”h]”hŒ²The Linux NVMe host driver in drivers/nvme/host/ supports devices
implementing the NVM Express (NVMe) family of specifications, which
currently consists of a number of documents:”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khhíh²hubhŒblock_quote”“”)”}”(hŒÑ- the NVMe Base specification
- various Command Set specifications (e.g. NVM Command Set)
- various Transport specifications (e.g. PCIe, Fibre Channel, RDMA, TCP)
- the NVMe Management Interface specification
”h]”hŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒthe NVMe Base specification”h]”hÞ)”}”(hj)  h]”hŒthe NVMe Base specification”…””}”(hj+  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khj'  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hj"  ubj&  )”}”(hŒ9various Command Set specifications (e.g. NVM Command Set)”h]”hÞ)”}”(hj@  h]”hŒ9various Command Set specifications (e.g. NVM Command Set)”…””}”(hjB  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khj>  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hj"  ubj&  )”}”(hŒFvarious Transport specifications (e.g. PCIe, Fibre Channel, RDMA, TCP)”h]”hÞ)”}”(hjW  h]”hŒFvarious Transport specifications (e.g. PCIe, Fibre Channel, RDMA, TCP)”…””}”(hjY  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KhjU  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hj"  ubj&  )”}”(hŒ,the NVMe Management Interface specification
”h]”hÞ)”}”(hŒ+the NVMe Management Interface specification”h]”hŒ+the NVMe Management Interface specification”…””}”(hjp  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khjl  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hj"  ubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1j   h³hÇh´Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  h³hÇh´Khhíh²hubhÞ)”}”(hŒCSee https://nvmexpress.org/developers/ for the NVMe specifications.”h]”(hŒSee ”…””}”(hj’  h²hh³Nh´NubhŒ	reference”“”)”}”(hŒ"https://nvmexpress.org/developers/”h]”hŒ"https://nvmexpress.org/developers/”…””}”(hjœ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”jž  uh1jš  hj’  ubhŒ for the NVMe specifications.”…””}”(hj’  h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khhíh²hubeh}”(h]”Œintroduction”ah ]”h"]”Œintroduction”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒSupported features”h]”hŒSupported features”…””}”(hjÀ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhj½  h²hh³hÇh´KubhÞ)”}”(hX¨  NVMe is a large suite of specifications, and contains features that are only
useful or suitable for specific use-cases. It is important to note that Linux
does not aim to implement every feature in the specification.  Every additional
feature implemented introduces more code, more maintenance and potentially more
bugs.  Hence there is an inherent tradeoff between functionality and
maintainability of the NVMe host driver.”h]”hX¨  NVMe is a large suite of specifications, and contains features that are only
useful or suitable for specific use-cases. It is important to note that Linux
does not aim to implement every feature in the specification.  Every additional
feature implemented introduces more code, more maintenance and potentially more
bugs.  Hence there is an inherent tradeoff between functionality and
maintainability of the NVMe host driver.”…””}”(hjÎ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´Khj½  h²hubhÞ)”}”(hŒ^Any feature implemented in the Linux NVMe host driver must support the
following requirements:”h]”hŒ^Any feature implemented in the Linux NVMe host driver must support the
following requirements:”…””}”(hjÜ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K&hj½  h²hubj  )”}”(hXÑ  1. The feature is specified in a release version of an official NVMe
   specification, or in a ratified Technical Proposal (TP) that is
   available on NVMe website. Or if it is not directly related to the
   on-wire protocol, does not contradict any of the NVMe specifications.
2. Does not conflict with the Linux architecture, nor the design of the
   NVMe host driver.
3. Has a clear, indisputable value-proposition and a wide consensus across
   the community.
”h]”hŒenumerated_list”“”)”}”(hhh]”(j&  )”}”(hX
  The feature is specified in a release version of an official NVMe
specification, or in a ratified Technical Proposal (TP) that is
available on NVMe website. Or if it is not directly related to the
on-wire protocol, does not contradict any of the NVMe specifications.”h]”hÞ)”}”(hX
  The feature is specified in a release version of an official NVMe
specification, or in a ratified Technical Proposal (TP) that is
available on NVMe website. Or if it is not directly related to the
on-wire protocol, does not contradict any of the NVMe specifications.”h]”hX
  The feature is specified in a release version of an official NVMe
specification, or in a ratified Technical Proposal (TP) that is
available on NVMe website. Or if it is not directly related to the
on-wire protocol, does not contradict any of the NVMe specifications.”…””}”(hj÷  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K)hjó  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hjð  ubj&  )”}”(hŒVDoes not conflict with the Linux architecture, nor the design of the
NVMe host driver.”h]”hÞ)”}”(hŒVDoes not conflict with the Linux architecture, nor the design of the
NVMe host driver.”h]”hŒVDoes not conflict with the Linux architecture, nor the design of the
NVMe host driver.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K-hj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hjð  ubj&  )”}”(hŒWHas a clear, indisputable value-proposition and a wide consensus across
the community.
”h]”hÞ)”}”(hŒVHas a clear, indisputable value-proposition and a wide consensus across
the community.”h]”hŒVHas a clear, indisputable value-proposition and a wide consensus across
the community.”…””}”(hj'  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K/hj#  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j%  hjð  ubeh}”(h]”h ]”h"]”h$]”h&]”Œenumtype”Œarabic”Œprefix”hŒsuffix”Œ.”uh1jî  hjê  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  h³hÇh´K)hj½  h²hubhÞ)”}”(hŒOVendor specific extensions are generally not supported in the NVMe host
driver.”h]”hŒOVendor specific extensions are generally not supported in the NVMe host
driver.”…””}”(hjL  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K2hj½  h²hubhÞ)”}”(hŒäIt is strongly recommended to work with the Linux NVMe and block layer
maintainers and get feedback on specification changes that are intended
to be used by the Linux NVMe host driver in order to avoid conflict at a
later stage.”h]”hŒäIt is strongly recommended to work with the Linux NVMe and block layer
maintainers and get feedback on specification changes that are intended
to be used by the Linux NVMe host driver in order to avoid conflict at a
later stage.”…””}”(hjZ  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K5hj½  h²hubeh}”(h]”Œsupported-features”ah ]”h"]”Œsupported features”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒQuirks”h]”hŒQuirks”…””}”(hjs  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhjp  h²hh³hÇh´K<ubhÞ)”}”(hXŸ  Sometimes implementations of open standards fail to correctly implement parts
of the standards.  Linux uses identifier-based quirks to work around such
implementation bugs.  The intent of quirks is to deal with widely available
hardware, usually consumer, which Linux users can't use without these quirks.
Typically these implementations are not or only superficially tested with Linux
by the hardware manufacturer.”h]”hX¡  Sometimes implementations of open standards fail to correctly implement parts
of the standards.  Linux uses identifier-based quirks to work around such
implementation bugs.  The intent of quirks is to deal with widely available
hardware, usually consumer, which Linux users canâ€™t use without these quirks.
Typically these implementations are not or only superficially tested with Linux
by the hardware manufacturer.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´K>hjp  h²hubhÞ)”}”(hX  The Linux NVMe maintainers decide ad hoc whether to quirk implementations
based on the impact of the problem to Linux users and how it impacts
maintainability of the driver.  In general quirks are a last resort, if no
firmware updates or other workarounds are available from the vendor.”h]”hX  The Linux NVMe maintainers decide ad hoc whether to quirk implementations
based on the impact of the problem to Linux users and how it impacts
maintainability of the driver.  In general quirks are a last resort, if no
firmware updates or other workarounds are available from the vendor.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KEhjp  h²hubhÞ)”}”(hX+  Quirks will not be added to the Linux kernel for hardware that isn't available
on the mass market.  Hardware that fails qualification for enterprise Linux
distributions, ChromeOS, Android or other consumers of the Linux kernel
should be fixed before it is shipped instead of relying on Linux quirks.”h]”hX-  Quirks will not be added to the Linux kernel for hardware that isnâ€™t available
on the mass market.  Hardware that fails qualification for enterprise Linux
distributions, ChromeOS, Android or other consumers of the Linux kernel
should be fixed before it is shipped instead of relying on Linux quirks.”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÝh³hÇh´KJhjp  h²hubeh}”(h]”Œquirks”ah ]”h"]”Œquirks”ah$]”h&]”uh1hÈhhÊh²hh³hÇh´K<ubeh}”(h]”Œ#linux-nvme-feature-and-quirk-policy”ah ]”h"]”Œ#linux nvme feature and quirk policy”ah$]”h&]”uh1hÈhhh²hh³hÇh´Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”hÇuh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(hÍNŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
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id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
decoration”Nh²hub.