linux-kernel - [PATCH v1 RFC 0/2] introduce fallback to pio in spi core

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1591880310-1813-1-git-send-email-yibin.gong@nxp.com>
Date:   Thu, 11 Jun 2020 20:58:28 +0800
From:   Robin Gong <yibin.gong@....com>
To:     broonie@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        festevam@...il.com, robin.murphy@....com,
        matthias.schiffer@...tq-group.com
Cc:     kernel@...gutronix.de, linux-imx@....com,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 RFC 0/2] introduce fallback to pio in spi core

Introudce fallback pio way at spi core level so that the tx/rx buffer
mapped by spi core for dma could be unmap and fallback pio again. Hence no
need the below patch where 'dma_sync_sg_for_devic' to sync fresh data back
into 'device' memory and sync to 'cpu' again in spi core.
https://www.spinics.net/lists/arm-kernel/msg812236.html

If you want to use this fallback feature, please set 'master->flags' with
SPI_MASTER_FALLBACK and add 'master->fallback' checking in your can_dma()
to ensure it can fallback to pio.

Robin Gong (2):
  spi: introduce fallback to pio
  spi: spi-imx: add fallback feature

 drivers/spi/spi-imx.c   | 23 +++++------------------
 drivers/spi/spi.c       | 11 +++++++++++
 include/linux/spi/spi.h |  4 ++++
 3 files changed, 20 insertions(+), 18 deletions(-)

-- 
2.7.4