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From: Corentin Labbe <clabbe.montjoie@gmail.com>
To: hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com,
	iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: DMA mapping fill dma_address to 0
Date: Wed, 28 Apr 2021 10:42:11 +0200	[thread overview]
Message-ID: <YIkf4yqt14dGPoyr@Red> (raw)

Hello

I work on the crypto offloader driver of cortina/gemini SL3516 SoC.
I test it by filling a LUKS2 partition.
I got a reproductible problem when handling skcipher requests.
I use dma_map_sg() and when iterating other the result, sg_dma_address(sg) return 0.
But sg_dma_len(sg) is still correct (4096 in my case).

Below is a simplified view of my code:
nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
(nr_sgs = 1 in my case)
sg = areq->src;
if (!sg_dma_address(sg))
	FAIL

I have digged to find what do dma_map_sg() and I have added some debug.
sg_page(sg) return c7efb000 for example so sg_page() works.
But it seems the problem is that page_to_phys(sg_page(sg)) return 0.

This problem does not appear immediatly, luksOpen and subsequent fsck always work.
But it appears fast after, when mouting or rsync files in it.

I have added CONFIG_DEBUG_SG, CONFIG_DMA_API_DEBUG, CONFIG_DMA_API_DEBUG_SG but they didnt bringed any more hints.
Only "DMA-API: cacheline tracking ENOMEM, dma-debug disabled" appears but always with some "time" between my problem and its display.
So I am not sure it is related.

Regards
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WARNING: multiple messages have this Message-ID (diff)
From: Corentin Labbe <clabbe.montjoie@gmail.com>
To: hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com,
	iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: DMA mapping fill dma_address to 0
Date: Wed, 28 Apr 2021 10:42:11 +0200	[thread overview]
Message-ID: <YIkf4yqt14dGPoyr@Red> (raw)

Hello

I work on the crypto offloader driver of cortina/gemini SL3516 SoC.
I test it by filling a LUKS2 partition.
I got a reproductible problem when handling skcipher requests.
I use dma_map_sg() and when iterating other the result, sg_dma_address(sg) return 0.
But sg_dma_len(sg) is still correct (4096 in my case).

Below is a simplified view of my code:
nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
(nr_sgs = 1 in my case)
sg = areq->src;
if (!sg_dma_address(sg))
	FAIL

I have digged to find what do dma_map_sg() and I have added some debug.
sg_page(sg) return c7efb000 for example so sg_page() works.
But it seems the problem is that page_to_phys(sg_page(sg)) return 0.

This problem does not appear immediatly, luksOpen and subsequent fsck always work.
But it appears fast after, when mouting or rsync files in it.

I have added CONFIG_DEBUG_SG, CONFIG_DMA_API_DEBUG, CONFIG_DMA_API_DEBUG_SG but they didnt bringed any more hints.
Only "DMA-API: cacheline tracking ENOMEM, dma-debug disabled" appears but always with some "time" between my problem and its display.
So I am not sure it is related.

Regards

             reply	other threads:[~2021-04-28  8:42 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-28  8:42 Corentin Labbe [this message]
2021-04-28  8:42 ` DMA mapping fill dma_address to 0 Corentin Labbe
2021-04-28 10:06 ` Robin Murphy
2021-04-28 10:06   ` Robin Murphy
2021-04-28 10:25   ` Corentin Labbe
2021-04-28 10:25     ` Corentin Labbe

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