Date:   Mon, 16 Mar 2020 08:00:39 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-crypto@...r.kernel.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Horia Geantă <horia.geanta@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Iuliana Prodan <iuliana.prodan@....com>,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: [PATCH v8 0/8] enable CAAM's HWRNG as default

Everyone:

This series is a continuation of original [discussion]. I don't know
if what's in the series is enough to use CAAMs HWRNG system wide, but
I am hoping that with enough iterations and feedback it will be.

Changes since [v1]:

    - Original hw_random replaced with the one using output of TRNG directly

    - SEC4 DRNG IP block exposed via crypto API

    - Small fix regarding use of GFP_DMA added to the series

Chagnes since [v2]:

    - msleep in polling loop to avoid wasting CPU cycles

    - caam_trng_read() bails out early if 'wait' is set to 'false'

    - fixed typo in ZII's name

Changes since [v3]:

    - DRNG's .cra_name is now "stdrng"

    - collected Reviewd-by tag from Lucas

    - typo fixes in commit messages of the series

Changes since [v4]:

    - Dropped "crypto: caam - RNG4 TRNG errata" and "crypto: caam -
      enable prediction resistance in HRWNG" to limit the scope of the
      series. Those two patches are not yet ready and can be submitted
      separately later.

    - Collected Tested-by from Chris

Changes since [v5]:

    - Series is converted back to implementing HWRNG using a job ring
      as per feedback from Horia.

Changes since [v6]:

    - "crypto: caam - drop global context pointer and init_done"
      changed to use devres group to allow freeing HWRNG resource
      independently of the parent device lifecycle. Code to deal with
      circular deallocation dependency is added as well

    - Removed worker self-scheduling in "crypto: caam - simplify RNG
      implementation". It didn't bring much value, but meant that
      simple cleanup with just a call to flush_work() wasn't good
      enough.

    - Added a simple function with a FIXME item for MC firmware check in
      "crypto: caam - enable prediction resistance in HRWNG"

    - "crypto: caam - limit single JD RNG output to maximum of 16
      bytes" now shrinks async FIFO size from 32K to 64 bytes, since
      having a buffer that big doesn't seem to do any good given that
      througput of TRNG

Changes since [v7]:

    - Collected Reviewd-bys from Horia

    - updated "crypto: caam - simplify RNG implementation" to drop
      custom type and fix comments

    - updated "crypto: caam - enable prediction resistance in HRWNG"
      to integrate code from Andrei Botila

    - updated "crypto: caam - drop global context pointer and
      init_done" to use .priv instead of container_of for private data
      pointer

Feedback is welcome!

Thanks,
Andrey Smirnov

[discussion] https://patchwork.kernel.org/patch/9850669/
[v1] https://lore.kernel.org/lkml/20191029162916.26579-1-andrew.smirnov@gmail.com
[v2] https://lore.kernel.org/lkml/20191118153843.28136-1-andrew.smirnov@gmail.com
[v3] https://lore.kernel.org/lkml/20191120165341.32669-1-andrew.smirnov@gmail.com
[v4] https://lore.kernel.org/lkml/20191121155554.1227-1-andrew.smirnov@gmail.com
[v5] https://lore.kernel.org/lkml/20191203162357.21942-1-andrew.smirnov@gmail.com
[v6] https://lore.kernel.org/lkml/20200108154047.12526-1-andrew.smirnov@gmail.com
[v7] https://lore.kernel.org/lkml/20200127165646.19806-1-andrew.smirnov@gmail.com

Andrey Smirnov (8):
  crypto: caam - allocate RNG instantiation descriptor with GFP_DMA
  crypto: caam - use struct hwrng's .init for initialization
  crypto: caam - drop global context pointer and init_done
  crypto: caam - simplify RNG implementation
  crypto: caam - check if RNG job failed
  crypto: caam - invalidate entropy register during RNG initialization
  crypto: caam - enable prediction resistance in HRWNG
  crypto: caam - limit single JD RNG output to maximum of 16 bytes

 drivers/crypto/caam/Kconfig   |   1 +
 drivers/crypto/caam/caamrng.c | 405 +++++++++++++---------------------
 drivers/crypto/caam/ctrl.c    |  88 ++++++--
 drivers/crypto/caam/desc.h    |   2 +
 drivers/crypto/caam/intern.h  |   7 +-
 drivers/crypto/caam/jr.c      |  13 +-
 drivers/crypto/caam/regs.h    |   7 +-
 7 files changed, 243 insertions(+), 280 deletions(-)

--
2.21.0

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