linux-kernel - Re: next-0519 on thinkpad x60: sound related? window manager crash

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Message-ID: <s5h3674ii49.wl-tiwai@suse.de>
Date:   Tue, 09 Jun 2020 13:38:46 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Christoph Hellwig <hch@....de>
Cc:     David Rientjes <rientjes@...gle.com>,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        alsa-devel@...a-project.org, bp@...en8.de, hch@...radead.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
        Pavel Machek <pavel@....cz>, perex@...ex.cz,
        tglx@...utronix.de, tiwai@...e.com, x86@...nel.org
Subject: Re: next-0519 on thinkpad x60: sound related? window manager crash

On Tue, 09 Jun 2020 13:31:23 +0200,
Christoph Hellwig wrote:
> 
> On Tue, Jun 09, 2020 at 11:31:20AM +0200, Takashi Iwai wrote:
> > > > How would be a proper way to get the virtually mapped SG-buffer pages
> > > > with coherent memory?  (Also allowing user-space mmap, too)
> > > 
> > > dma_mmap_coherent / dma_mmap_attrs for userspace.  We don't really
> > > have a good way for kernel space mappings.
> > 
> > And that's the missing piece right now...  :-<
> 
> Can you point me to the relevant places (allocation and vmap mostly)
> so that I can take a look at how to fix this mess?

Found in sound/core/sgbuf.c.  It's specific to x86.
Also, for V4L, drivers/media/v4l2-core/videobuf-dma-sg.c.


thanks,

Takashi