From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lelnx193.ext.ti.com ([198.47.27.77]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1ciK7v-0006Pw-OX for linux-mtd@lists.infradead.org; Mon, 27 Feb 2017 12:10:06 +0000 From: Vignesh R To: David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Cyrille Pitchen CC: , , , Vignesh R , Frode Isaksen , Subject: [RFC PATCH 0/2] mtd: spi-nor: Handle vmalloc'd buffers Date: Mon, 27 Feb 2017 17:38:37 +0530 Message-ID: <20170227120839.16545-1-vigneshr@ti.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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