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Subject: [PATCH v2 0/6] nfit/ars: Improve polling and short-ARS execution
From:   Dan Williams <dan.j.williams@intel.com>
To:     linux-nvdimm@lists.01.org
Cc:     Krzysztof Rusocki <krzysztof.rusocki@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Toshi Kani <toshi.kani@hpe.com>,
        Erwin Tsaur <erwin.tsaur@oracle.com>,
        linux-kernel@vger.kernel.org
Date:   Fri, 15 Feb 2019 11:43:47 -0800
Message-ID: <155025982726.1043225.15436410616433285475.stgit@dwillia2-desk3.amr.corp.intel.com>
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Changes since v1: [1]
* Fix the root poll interval support to avoid a infinite loop condition
  when the polling is faster than the ARS completion.
* Move the introduction of scrub_flags earlier in the series and
  introduce ARS_POLL to fix the above issue.

[1]: https://lists.01.org/pipermail/linux-nvdimm/2019-February/019964.html

---

Here is a small pile of updates to better coordinate the Linux ARS state
machine with platform-BIOS implementations. Specifically, take advantage
of opportunities to run short-ARS whenever the ARS interface is found to
be idle at init, always run short-ARS even if no_init_ars is specified,
allow root to reset the exponential backoff polling interval for ARS
completion, and protect the kernel against the consumption of stale ARS
results.

---

Dan Williams (6):
      nfit/ars: Attempt a short-ARS whenever the ARS state is idle at boot
      nfit/ars: Attempt short-ARS even in the no_init_ars case
      nfit/ars: Remove ars_start_flags
      nfit/ars: Introduce scrub_flags
      nfit/ars: Allow root to busy-poll the ARS state machine
      nfit/ars: Avoid stale ARS results


 drivers/acpi/nfit/core.c |   70 ++++++++++++++++++++++++++++++++--------------
 drivers/acpi/nfit/nfit.h |   11 +++++--
 2 files changed, 57 insertions(+), 24 deletions(-)