linux-kernel - Re: [PATCH v7 00/12] Introduce In Field Scan driver

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Date:   Wed, 11 May 2022 17:51:57 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Tony Luck <tony.luck@...el.com>, markgross@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        corbet@....net, gregkh@...uxfoundation.org,
        andriy.shevchenko@...ux.intel.com, jithu.joseph@...el.com,
        ashok.raj@...el.com, rostedt@...dmis.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v7 00/12] Introduce In Field Scan driver

Hi,

On 5/7/22 00:53, Tony Luck wrote:
> TL;DR this driver loads scan test files that can check whether silicon
> in a CPU core is still running correctly. It is expected that these tests
> would be run several times per day to catch problems as silicon ages.

Thank you for your patch-series, I've applied the series to my
review-hans branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans




> 
> Changes since v6
> 
> Thomas Gleixner
> ---------------
> "struct workqueue_struct *ifs_wq; Seems to be unused."
> 
> True. Deleted.
> 
> "static bool oscan_enabled = true; What changes this?"
> 
> Code that cleared it deleted. Drop this too.
> 
> "Please add curly brackets as these are not one-line statements"
> 
> Added
> 
> cpumask_first(topology_sibling_cpumask(cpu)); Shouldn't that be cpu_smt_mask()?"
> 
> Changed (and several other places)
> 
> "take up to 200 milliseconds before it retires.  200ms per test chunk?"
> 
> Updated comment to note that 200ms is for all chunks.
> 
> "Documentation lost in the intertubes"
> 
> Dredged up the version from v3 series and changed:
> 1) Fixed pathnames now this is a virtual misc device instead of platform
> device
> 2) Put all the text into a "/** DOC:" comment section in ifs.h with just
> a "kernel-doc:: drivers/platform/x86/intel/ifs/ifs.h" in the ifs.rst
> file under Documentation/x86.
> 3) Added a "big fat warning" (in all CAPS) pointing out that a core test
> can take up to 200 milliseconds. So admins must take extra steps if they
> are running latency sensitive workloads.
> 4) Added note that all HT threads of a core must be online to run a
> test.
> 
> Tony Luck
> ---------
> Off-by-one on retries check (#define set to 5, but tried 6 times). Fixed
> Fixed kerneldoc description of "integrity_cap_bit" (was missing a ":")
> 
> Jithu Joseph (7):
>   x86/microcode/intel: Expose collect_cpu_info_early() for IFS
>   platform/x86/intel/ifs: Read IFS firmware image
>   platform/x86/intel/ifs: Check IFS Image sanity
>   platform/x86/intel/ifs: Authenticate and copy to secured memory
>   platform/x86/intel/ifs: Add scan test support
>   platform/x86/intel/ifs: Add IFS sysfs interface
>   platform/x86/intel/ifs: add ABI documentation for IFS
> 
> Peter Zijlstra (1):
>   stop_machine: Add stop_core_cpuslocked() for per-core operations
> 
> Tony Luck (4):
>   x86/msr-index: Define INTEGRITY_CAPABILITIES MSR
>   platform/x86/intel/ifs: Add stub driver for In-Field Scan
>   trace: platform/x86/intel/ifs: Add trace point to track Intel IFS
>     operations
>   Documentation: In-Field Scan
> 
>  .../ABI/testing/sysfs-platform-intel-ifs      |  39 +++
>  Documentation/x86/ifs.rst                     |   2 +
>  Documentation/x86/index.rst                   |   1 +
>  MAINTAINERS                                   |   8 +
>  arch/x86/include/asm/cpu.h                    |  18 ++
>  arch/x86/include/asm/msr-index.h              |   7 +
>  arch/x86/kernel/cpu/intel.c                   |  32 +++
>  arch/x86/kernel/cpu/microcode/intel.c         |  59 +---
>  drivers/platform/x86/intel/Kconfig            |   1 +
>  drivers/platform/x86/intel/Makefile           |   1 +
>  drivers/platform/x86/intel/ifs/Kconfig        |  13 +
>  drivers/platform/x86/intel/ifs/Makefile       |   3 +
>  drivers/platform/x86/intel/ifs/core.c         |  73 +++++
>  drivers/platform/x86/intel/ifs/ifs.h          | 234 +++++++++++++++
>  drivers/platform/x86/intel/ifs/load.c         | 266 ++++++++++++++++++
>  drivers/platform/x86/intel/ifs/runtest.c      | 252 +++++++++++++++++
>  drivers/platform/x86/intel/ifs/sysfs.c        | 149 ++++++++++
>  include/linux/stop_machine.h                  |  16 ++
>  include/trace/events/intel_ifs.h              |  41 +++
>  kernel/stop_machine.c                         |  19 ++
>  20 files changed, 1182 insertions(+), 52 deletions(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-platform-intel-ifs
>  create mode 100644 Documentation/x86/ifs.rst
>  create mode 100644 drivers/platform/x86/intel/ifs/Kconfig
>  create mode 100644 drivers/platform/x86/intel/ifs/Makefile
>  create mode 100644 drivers/platform/x86/intel/ifs/core.c
>  create mode 100644 drivers/platform/x86/intel/ifs/ifs.h
>  create mode 100644 drivers/platform/x86/intel/ifs/load.c
>  create mode 100644 drivers/platform/x86/intel/ifs/runtest.c
>  create mode 100644 drivers/platform/x86/intel/ifs/sysfs.c
>  create mode 100644 include/trace/events/intel_ifs.h
> 
> 
> base-commit: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a