linux-kernel - [RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers

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Date:   Mon, 27 Feb 2017 17:38:37 +0530
From:   Vignesh R <vigneshr@...com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
CC:     <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, Vignesh R <vigneshr@...com>,
        Frode Isaksen <fisaksen@...libre.com>,
        <linux-spi@...r.kernel.org>
Subject: [RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers

This series implements bounce buffer support to handle vmalloc'd buffers
in case of drivers use DMA, similar to what is done in MTD NAND
framework.

I have tested this on two platform:
DRA74 SoC (cortex a15 @1GHz) with s25fl256s1 QSPI (SPI bus frequency
76.8 MHz) and I don't see any performance degradation with UBIFS
read/write(10MB file).
AM437x SoC (cortex a9 @1GHz) with macronix mx66l51235l QSPI flash (SPI bus
frequency 48MHz) and performance degradation is <4% for UBIFS.

Vignesh R (2):
  mtd: spi-nor: Introduce bounce buffer to handle vmalloc'd buffers
  mtd: devices: m25p80: Enable spi-nor bounce buffer support

 drivers/mtd/devices/m25p80.c  |  1 +
 drivers/mtd/spi-nor/spi-nor.c | 30 +++++++++++++++++++++++++++---
 include/linux/mtd/spi-nor.h   |  4 ++++
 3 files changed, 32 insertions(+), 3 deletions(-)

-- 
2.11.0