linux-kernel - Re: ensure dma_alloc_coherent always returns zeroed memory

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Date:   Thu, 20 Dec 2018 14:32:52 +0000
From:   Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
To:     "hch@....de" <hch@....de>,
        Vineet Gupta <vineet.gupta1@...opsys.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>,
        "ashutosh.dixit@...el.com" <ashutosh.dixit@...el.com>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linux-c6x-dev@...ux-c6x.org" <linux-c6x-dev@...ux-c6x.org>,
        "monstr@...str.eu" <monstr@...str.eu>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>
Subject: Re: ensure dma_alloc_coherent always returns zeroed memory

Hi Christoph,

I test kernel from your 'dma-alloc-always-zero' branch, and as
I can see we have DMA peripherals (like USB) broken.

There are the errors example I got during USB initializing:
------------------------------>8--------------------------------
usb 1-1: device descriptor read/64, error -110
usb usb1-port1: attempt power cycle
usb 1-1: new high-speed USB device number 4 using ehci-platform
usb 1-1: device descriptor read/64, error -110
usb 1-1: device descriptor read/64, error -110
usb 1-1: new high-speed USB device number 5 using ehci-platform
usb 1-1: device descriptor read/64, error -110
usb 1-1: device descriptor read/64, error -110
usb usb1-port1: unable to enumerate USB device
usb 2-1: new full-speed USB device number 2 using ohci-platform
usb 2-1: device descriptor read/all, error -84
usb 2-1: new full-speed USB device number 3 using ohci-platform
usb 2-1: device descriptor read/all, error -84
usb usb2-port1: attempt power cycle
usb 2-1: new full-speed USB device number 4 using ohci-platform
usb 2-1: device descriptor read/8, error -62
usb 2-1: device descriptor read/8, error -62
usb 2-1: new full-speed USB device number 5 using ohci-platform
usb 2-1: device descriptor read/8, error -84
usb 2-1: device descriptor read/8, error -84
usb usb2-port1: unable to enumerate USB device
 [snip]
------------------------------8<--------------------------------


On Wed, 2018-12-19 at 17:59 +0100, Christoph Hellwig wrote:
> FYI, I've picked this up for dma-mapping for-next now.
> 
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-- 
 Eugeniy Paltsev