1. 04 9月, 2018 1 次提交
  2. 15 8月, 2018 1 次提交
  3. 30 6月, 2018 1 次提交
  4. 05 6月, 2018 1 次提交
  5. 25 5月, 2018 1 次提交
  6. 08 5月, 2018 1 次提交
  7. 04 5月, 2018 1 次提交
  8. 25 4月, 2018 1 次提交
    • A
      PCI/IOV: Add pci-pf-stub driver for PFs that only enable VFs · a8ccf8a6
      Alexander Duyck 提交于
      Some SR-IOV PF devices provide no functionality other than acting as a
      means of enabling VFs.  For these devices, we want to enable the VFs and
      assign them to guest virtual machines, but there's no need to have a driver
      for the PF itself.
      
      Add a new pci-pf-stub driver to claim those PF devices and provide the
      generic VF enable functionality.  An administrator can use the sysfs
      "sriov_numvfs" file to enable VFs, then assign them to guests.
      
      For now I only have one example ID provided by Amazon in terms of devices
      that require this functionality.  The general idea is that in the future we
      will see other devices added as vendors come up with devices where the PF
      is more or less just a lightweight shim used to allocate VFs.
      Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com>
      [bhelgaas: changelog]
      Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
      Reviewed-by: NGreg Rose <gvrose8192@gmail.com>
      Reviewed-by: NChristoph Hellwig <hch@lst.de>
      a8ccf8a6
  9. 20 3月, 2018 1 次提交
  10. 15 3月, 2018 1 次提交
  11. 14 3月, 2018 1 次提交
    • L
      vga_switcheroo: Use device link for HDA controller · 07f4f97d
      Lukas Wunner 提交于
      Back in 2013, runtime PM for GPUs with integrated HDA controller was
      introduced with commits 0d69704a ("gpu/vga_switcheroo: add driver
      control power feature. (v3)") and 246efa4a ("snd/hda: add runtime
      suspend/resume on optimus support (v4)").
      
      Briefly, the idea was that the HDA controller is forced on and off in
      unison with the GPU.
      
      The original code is mostly still in place even though it was never a
      100% perfect solution:  E.g. on access to the HDA controller, the GPU
      is powered up via vga_switcheroo_runtime_resume_hdmi_audio() but there
      are no provisions to keep it resumed until access to the HDA controller
      has ceased:  The GPU autosuspends after 5 seconds, rendering the HDA
      controller inaccessible.
      
      Additionally, a kludge is required when hda_intel.c probes:  It has to
      check whether the GPU is powered down (check_hdmi_disabled()) and defer
      probing if so.
      
      However in the meantime (in v4.10) the driver core has gained a feature
      called device links which promises to solve such issues in a clean way:
      It allows us to declare a dependency from the HDA controller (consumer)
      to the GPU (supplier).  The PM core then automagically ensures that the
      GPU is runtime resumed as long as the HDA controller's ->probe hook is
      executed and whenever the HDA controller is accessed.
      
      By default, the HDA controller has a dependency on its parent, a PCIe
      Root Port.  Adding a device link creates another dependency on its
      sibling:
      
                                  PCIe Root Port
                                   ^          ^
                                   |          |
                                   |          |
                                  HDA  ===>  GPU
      
      The device link is not only used for runtime PM, it also guarantees that
      on system sleep, the HDA controller suspends before the GPU and resumes
      after the GPU, and on system shutdown the HDA controller's ->shutdown
      hook is executed before the one of the GPU.  It is a complete solution.
      
      Using this functionality is as simple as calling device_link_add(),
      which results in a dmesg entry like this:
      
              pci 0000:01:00.1: Linked as a consumer to 0000:01:00.0
      
      The code for the GPU-governed audio power management can thus be removed
      (except where it's still needed for legacy manual power control).
      
      The device link is added in a PCI quirk rather than in hda_intel.c.
      It is therefore legal for the GPU to runtime suspend to D3cold even if
      the HDA controller is not bound to a driver or if CONFIG_SND_HDA_INTEL
      is not enabled, for accesses to the HDA controller will cause the GPU to
      wake up regardless if they're occurring outside of hda_intel.c (think
      config space readout via sysfs).
      
      Contrary to the previous implementation, the HDA controller's power
      state is now self-governed, rather than GPU-governed, whereas the GPU's
      power state is no longer fully self-governed.  (The HDA controller needs
      to runtime suspend before the GPU can.)
      
      It is thus crucial that runtime PM is always activated on the HDA
      controller even if CONFIG_SND_HDA_POWER_SAVE_DEFAULT is set to 0 (which
      is the default), lest the GPU stays awake.  This is achieved by setting
      the auto_runtime_pm flag on every codec and the AZX_DCAPS_PM_RUNTIME
      flag on the HDA controller.
      
      A side effect is that power consumption might be reduced if the GPU is
      in use but the HDA controller is not, because the HDA controller is now
      allowed to go to D3hot.  Before, it was forced to stay in D0 as long as
      the GPU was in use.  (There is no reduction in power consumption on my
      Nvidia GK107, but there might be on other chips.)
      
      The code paths for legacy manual power control are adjusted such that
      runtime PM is disabled during power off, thereby preventing the PM core
      from resuming the HDA controller.
      
      Note that the device link is not only added on vga_switcheroo capable
      systems, but for *any* GPU with integrated HDA controller.  The idea is
      that the HDA controller streams audio via connectors located on the GPU,
      so the GPU needs to be on for the HDA controller to do anything useful.
      
      This commit implicitly fixes an unbalanced runtime PM ref upon unbind of
      hda_intel.c:  On ->probe, a runtime PM ref was previously released under
      the condition "azx_has_pm_runtime(chip) || hda->use_vga_switcheroo", but
      on ->remove a runtime PM ref was only acquired under the first of those
      conditions.  Thus, binding and unbinding the driver twice on a
      vga_switcheroo capable system caused the runtime PM refcount to drop
      below zero.  The issue is resolved because the AZX_DCAPS_PM_RUNTIME flag
      is now always set if use_vga_switcheroo is true.
      
      For more information on device links please refer to:
      https://www.kernel.org/doc/html/latest/driver-api/device_link.html
      Documentation/driver-api/device_link.rst
      
      Cc: Dave Airlie <airlied@redhat.com>
      Cc: Ben Skeggs <bskeggs@redhat.com>
      Cc: Alex Deucher <alexander.deucher@amd.com>
      Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
      Acked-by: NBjorn Helgaas <bhelgaas@google.com>
      Reviewed-by: NTakashi Iwai <tiwai@suse.de>
      Reviewed-by: NPeter Wu <peter@lekensteyn.nl>
      Tested-by: Kai Heng Feng <kai.heng.feng@canonical.com> # AMD PowerXpress
      Tested-by: Mike Lothian <mike@fireburn.co.uk>          # AMD PowerXpress
      Tested-by: Denis Lisov <dennis.lissov@gmail.com>       # Nvidia Optimus
      Tested-by: Peter Wu <peter@lekensteyn.nl>              # Nvidia Optimus
      Tested-by: Lukas Wunner <lukas@wunner.de>              # MacBook Pro
      Signed-off-by: NLukas Wunner <lukas@wunner.de>
      Link: https://patchwork.freedesktop.org/patch/msgid/51bd38360ff502a8c42b1ebf4405ee1d3f27118d.1520068884.git.lukas@wunner.de
      07f4f97d
  12. 28 2月, 2018 1 次提交
  13. 23 2月, 2018 1 次提交
    • F
      PCI: Add ACS quirk for Ampere root ports · 4ef76ad0
      Feng Kan 提交于
      The Ampere Computing PCIe root port does not support ACS at this point.
      However, the hardware provides isolation and source validation through the
      SMMU. The stream ID generated by the PCIe ports contain both the
      bus/device/function number as well as the port ID in its 3 most significant
      bits. Turn on ACS but disable all the peer-to-peer features.
      
      APM is being rebranded to Ampere.  The Vendor and Device IDs change, but
      the functionality stays the same.
      Signed-off-by: NFeng Kan <fkan@apm.com>
      Signed-off-by: NBjorn Helgaas <helgaas@kernel.org>
      4ef76ad0
  14. 07 2月, 2018 1 次提交
  15. 31 1月, 2018 1 次提交
  16. 02 11月, 2017 1 次提交
    • G
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman 提交于
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      
      How this work was done:
      
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: NKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: NPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  17. 12 8月, 2017 1 次提交
  18. 08 7月, 2017 1 次提交
  19. 28 4月, 2017 1 次提交
  20. 09 2月, 2017 1 次提交
  21. 06 12月, 2016 1 次提交
  22. 04 12月, 2016 1 次提交
  23. 18 11月, 2016 1 次提交
  24. 09 4月, 2016 1 次提交
  25. 15 3月, 2016 1 次提交
  26. 09 3月, 2016 1 次提交
  27. 16 1月, 2016 1 次提交
  28. 11 12月, 2015 1 次提交
  29. 04 12月, 2015 1 次提交
  30. 17 8月, 2015 1 次提交
  31. 15 6月, 2015 1 次提交
  32. 28 5月, 2015 1 次提交
  33. 22 4月, 2015 1 次提交
  34. 11 3月, 2015 1 次提交
  35. 04 11月, 2014 1 次提交
  36. 20 10月, 2014 1 次提交
  37. 09 10月, 2014 1 次提交
  38. 26 9月, 2014 1 次提交
  39. 25 9月, 2014 1 次提交
  40. 24 9月, 2014 1 次提交