linux-kernel - Re: [PATCH 1/3] ASoC: amd: use DMA addr rather than CPU pa for audio buffer

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Date:   Thu, 1 Aug 2019 13:59:08 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@....com>
Cc:     Alexander.Deucher@....com,
        Vijendar Mukunda <vijendar.mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maruthi Bayyavarapu <maruthi.bayyavarapu@....com>,
        YueHaibing <yuehaibing@...wei.com>,
        Colin Ian King <colin.king@...onical.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ASoC: amd: use DMA addr rather than CPU pa for audio
 buffer

On Mon, Jul 29, 2019 at 05:38:29PM +0530, Ravulapati Vishnu vardhan rao wrote:
> We shouldn't assume CPU physical address we get from page_to_phys()
> is same as DMA address we get from dma_alloc_coherent(). On x86_64,
> we won't run into any problem with the assumption when dma_ops is
> nommu_dma_ops. However, DMA address is IOVA when IOMMU is enabled.
> And it's most likely different from CPU physical address when AMD
> IOMMU is not in passthrough mode.

This doesn't build for me:

sound/soc/amd/raven/acp3x-pcm-dma.c: In function ‘acp3x_dma_hw_params’:
sound/soc/amd/raven/acp3x-pcm-dma.c:356:2: error: ‘pg’ undeclared (first use in this function)
  pg = virt_to_page(substream->dma_buffer.area);
  ^~
sound/soc/amd/raven/acp3x-pcm-dma.c:356:2: note: each undeclared identifier is reported only once for each function it appears in

Please check and resend.

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