linux-kernel - [PATCH PoCv2 0/2] mmc: add blk-mq support

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Message-id: <1483464618-16133-1-git-send-email-b.zolnierkie@samsung.com>
Date:   Tue, 03 Jan 2017 18:30:16 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...com>, Hannes Reinecke <hare@...e.com>,
        Tejun Heo <tj@...nel.org>, Omar Sandoval <osandov@...ndov.com>,
        Christoph Hellwig <hch@....de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        baolin.wang@...aro.org, riteshh@...eaurora.org, arnd@...db.de,
        zhang.chunyan@...aro.org, linux-mmc@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        b.zolnierkie@...sung.com
Subject: [PATCH PoCv2 0/2] mmc: add blk-mq support

Hi,

It prints a lot of scheduling while atomic warnings during
boot, lacks error handling and is otherwise incomplete but
boots successully on my Odroid-XU3 board.  I hope that it
is useful to somebody.

The differences between these patches and Linus' RFD patch:
- request completion is handled from the IRQ handler
  (or tasklet context as happens in dw_mmc host driver)
- adds blk-mq code while leaving old code still in place
- based on top of on Adrian's queue handling cleanups
- no support for qdepth == 2 at the moment

The patchset is based on top of commit "mmc: block:
Introduce queue semantics" from swcmdq branch by Adrian
Hunter:

  http://git.infradead.org/users/ahunter/linux-sdhci.git
  (swcmdq branch
   commit 7a1cdc218dac843ebb4eac6d3fd24d54ba30a5b0)

The complete patchset can be found at:

  https://github.com/bzolnier/linux.git mmc-blk-mq-pocv2

Changes since PoC version
(http://www.spinics.net/lists/linux-mmc/msg39351.html):
- removed most of the debugging code
- reworked the blk-mq code to be an add-on instead of
  rewrite
- ported over newer swcmdq branch version
- reverted shared mmc queue changes from swcmdq as they
  break mmc-mq currently
- dropped support for qdepth == 2 as it hasn't survived
  the forward porting (it was ugly & not optimal anyway,
  rewrite to try hwqueue == 2 idea is on TODO)
- misc cleanups

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics


Bartlomiej Zolnierkiewicz (2):
  Revert "mmc: queue: Share mmc request array between partitions"
  mmc-mq: initial blk-mq support

 drivers/mmc/core/block.c    | 115 ++++++++++-----
 drivers/mmc/core/block.h    |   3 +-
 drivers/mmc/core/bus.c      |   3 +-
 drivers/mmc/core/core.c     | 120 +++++++++++++++-
 drivers/mmc/core/mmc_test.c |  16 ++-
 drivers/mmc/core/queue.c    | 344 +++++++++++++++++++++++++-------------------
 drivers/mmc/core/queue.h    |   7 +-
 include/linux/mmc/card.h    |   5 -
 include/linux/mmc/core.h    |  12 ++
 9 files changed, 421 insertions(+), 204 deletions(-)

-- 
1.9.1