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Hans de Goede d341838d77 x86/PCI: Disable E820 reserved region clipping via quirks 
To avoid unusable space that some firmware includes in PCI host bridge
_CRS, Linux currently excludes E820 reserved regions from _CRS windows; see
4dc2287c18 ("x86: avoid E820 regions when allocating address space").

However, some systems supply E820 reserved regions that cover the entire
memory window from _CRS, so clipping them out leaves no space for hot-added
or uninitialized PCI devices.

For example, from a Lenovo IdeaPad 3 15IIL 81WE:

  BIOS-e820: [mem 0x4bc50000-0xcfffffff] reserved
  pci_bus 0000:00: root bus resource [mem 0x65400000-0xbfffffff window]
  pci 0000:00:15.0: BAR 0: [mem 0x00000000-0x00000fff 64bit]
  pci 0000:00:15.0: BAR 0: no space for [mem size 0x00001000 64bit]

Add quirks to disable the E820 clipping for machines known to do this.

A single DMI_PRODUCT_VERSION "IIL" quirk matches all the below:

  Lenovo IdeaPad 3 14IIL05
  Lenovo IdeaPad 3 15IIL05
  Lenovo IdeaPad 3 17IIL05
  Lenovo IdeaPad 5 14IIL05
  Lenovo IdeaPad 5 15IIL05
  Lenovo IdeaPad Slim 7 14IIL05
  Lenovo IdeaPad Slim 7 15IIL05
  Lenovo IdeaPad S145-15IIL
  Lenovo IdeaPad S340-14IIL
  Lenovo IdeaPad S340-15IIL
  Lenovo IdeaPad C340-15IIL
  Lenovo BS145-15IIL
  Lenovo V14-IIL
  Lenovo V15-IIL
  Lenovo V17-IIL
  Lenovo Yoga C940-14IIL
  Lenovo Yoga S740-14IIL
  Lenovo Yoga Slim 7 14IIL05
  Lenovo Yoga Slim 7 15IIL05

in addition to the following that don't actually need it because they have
no E820 reserved regions that overlap _CRS windows:

  Lenovo IdeaPad Flex 5 14IIL05
  Lenovo IdeaPad Flex 5 15IIL05
  Lenovo ThinkBook 14-IIL
  Lenovo ThinkBook 15-IIL
  Lenovo Yoga S940-14IIL

Other quirks match these:

  Acer Spin 5 (SP513-54N)

  Clevo X170KM-G Barebone

Link: https://bugzilla.kernel.org/show_bug.cgi?id=206459 Lenovo Yoga C940-14IIL
Link: https://bugzilla.kernel.org/show_bug.cgi?id=214259 Clevo X170KM Barebone
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1868899 Lenovo IdeaPad 3 15IIL05
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1871793 Lenovo IdeaPad 5 14IIL05
Link: https://bugs.launchpad.net/bugs/1878279 Lenovo IdeaPad 5 14IIL05
Link: https://bugs.launchpad.net/bugs/1880172 Lenovo IdeaPad 3 14IIL05
Link: https://bugs.launchpad.net/bugs/1884232 Acer Spin SP513-54N
Link: https://bugs.launchpad.net/bugs/1921649 Lenovo IdeaPad S145
Link: https://bugs.launchpad.net/bugs/1931715 Lenovo IdeaPad S145
Link: https://bugs.launchpad.net/bugs/1932069 Lenovo BS145-15IIL
Link: https://lore.kernel.org/r/20220519152150.6135-3-hdegoede@redhat.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Benoit Grégoire <benoitg@coeus.ca>
Cc: Hui Wang <hui.wang@canonical.com>
2022-05-19 16:55:46 -05:00
arch x86/PCI: Disable E820 reserved region clipping via quirks 2022-05-19 16:55:46 -05:00
block for-5.18/block-2022-04-01 2022-04-01 16:20:00 -07:00
certs Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
crypto for-5.18/64bit-pi-2022-03-25 2022-03-26 12:01:35 -07:00
Documentation x86/PCI: Add kernel cmdline options to use/ignore E820 reserved regions 2022-05-19 14:26:55 -05:00
drivers A single revert to fix a boot regression seen when clk_put() started 2022-04-03 12:21:14 -07:00
fs Updates to Tracing: 2022-04-03 12:26:01 -07:00
include Updates to Tracing: 2022-04-03 12:26:01 -07:00
init Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel Updates to Tracing: 2022-04-03 12:26:01 -07:00
lib for-5.18/block-2022-04-01 2022-04-01 16:20:00 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm Filesystem/VFS changes for 5.18, part two 2022-04-01 13:50:50 -07:00
net Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
samples dma-mapping updates for Linux 5.18 2022-03-29 08:50:14 -07:00
scripts modpost: restore the warning message for missing symbol versions 2022-04-03 03:11:51 +09:00
security hardening updates for v5.18-rc1-fix1 2022-03-31 11:43:01 -07:00
sound sound fixes for 5.18-rc1 2022-04-01 10:32:46 -07:00
tools A set of x86 fixes and updates: 2022-04-03 12:15:47 -07:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: Remove dirty handling from gfn_to_pfn_cache completely 2022-04-02 05:34:41 -04:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Kirill's email 2022-04-01 11:46:09 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +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 chrome platform changes for 5.18 2022-04-02 10:44:18 -07:00
Makefile Linux 5.18-rc1 2022-04-03 14:08:21 -07:00
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.