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Re: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU

From Harsh Jain <Harsh@chelsio.com>
Newsgroups linux.kernel
Subject Re: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU
Date 2017-09-26 14:30 +0200
Message-ID <utX9T-4JB-19@gated-at.bofh.it> (permalink)
References (1 earlier) <urKgO-1Dz-25@gated-at.bofh.it> <utFG1-198-5@gated-at.bofh.it> <utGC6-1Kz-19@gated-at.bofh.it> <utGC7-1Kz-35@gated-at.bofh.it> <utP2G-7zs-13@gated-at.bofh.it>
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Find attached new set of log. After repeated tries it panics.


On 26-09-2017 09:16, Harsh Jain wrote:
> On 26-09-2017 00:16, Casey Leedom wrote:
>> | From: Raj, Ashok <ashok.raj@intel.com>
>> | Sent: Monday, September 25, 2017 8:54 AM
>> |
>> | Not sure how the page->offset would end up being greater than page-size?
> Refer below
>> |
>> | If you have additional traces, please send them by.
>> |
>> | Is this a new driver? wondering how we didn't run into this?
>>
>>   According to Herbert Xu and one of our own engineers, it's actually legal
>> for Scatter/Gather Lists to have this.  This isn't my area of expertise
>> though so I'm just passing that on.
>>
>>   I've asked our team to produce a detailed trace of the exact
>> Scatter/Gather Lists they're seeing and what ends up coming out of the DMA
>> Mappings, etc.  They're in India, so I expect that they'll have this for you
>> by tomorrow morning.
> Below mentioned log was already there in 1st mail. Copied here for easy reference. Let me know if you need
> additional traces.
>
> 1) IN esp_output() "__skb_to_sgvec()" convert skb frags to scatter gather list. 
> At that moment sg->offset was 4094.
> 2) From esp_output control reaches to "crypto_authenc_encrypt()". Here in 
> "scatterwalk_ffwd()" sg->offset become 4110.
> 3) Same sg list received by chelsio crypto driver(chcr). When chcr try to do 
> DMA mapping it starts giving DMA errors.
>
> Following error observed. first two prints are added for debugging in chcr. 
> Kernel version used to reproduce is 4.9.28 on x86_64 with Page size 4K.
>
> Sep 15 12:40:52 heptagon kernel: process_cipher req src ffff8803cb41f0a8
> Sep 15 12:40:52 heptagon kernel: ========= issue    hit offset:4110 ======= 
> dma_addr f24b000e ==> DMA mapped address returned by dma_map_sg()
>
> Sep 15 12:40:52 heptagon kernel: DMAR: DRHD: handling fault status reg 2
> Sep 15 12:40:52 heptagon kernel: DMAR: [DMA Write] Request device [02:00.4] 
> fault addr f24b0000 [fault reason 05] PTE Write access is not set
>
>> Casey

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Thread

DMA error when sg->offset value is greater than PAGE_SIZE in Intel  IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-16 08:20 +0200
  Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Herbert Xu <herbert@gondor.apana.org.au> - 2017-09-20 10:10 +0200
    Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Robin Murphy <robin.murphy@arm.com> - 2017-09-20 12:20 +0200
      Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-20 13:30 +0200
      Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-25 19:50 +0200
        Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-25 20:50 +0200
          Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-25 20:50 +0200
            Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-26 05:50 +0200
              Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-26 14:30 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Robin Murphy <robin.murphy@arm.com> - 2017-09-26 16:30 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Dan Williams <dan.j.williams@intel.com> - 2017-09-26 18:20 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-27 18:40 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Dan Williams <dan.j.williams@intel.com> - 2017-09-27 19:20 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Christoph Hellwig <hch@infradead.org> - 2017-10-01 11:00 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-27 19:50 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-27 23:30 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-28 00:10 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-28 00:20 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-28 07:10 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Herbert Xu <herbert@gondor.apana.org.au> - 2017-09-28 12:40 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-28 15:40 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-28 18:10 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-29 07:40 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-27 19:40 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-26 19:30 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-26 23:00 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-26 19:30 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Robin Murphy <robin.murphy@arm.com> - 2017-09-26 20:20 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-26 19:40 +0200
        Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Dan Williams <dan.j.williams@intel.com> - 2017-09-25 21:40 +0200
          Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-25 22:10 +0200
            Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Dan Williams <dan.j.williams@intel.com> - 2017-09-25 22:20 +0200
              Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU "Raj, Ashok" <ashok.raj@intel.com> - 2017-09-25 23:50 +0200
                Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-26 01:50 +0200
              Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-26 15:10 +0200
    Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-20 13:40 +0200
    Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU David Woodhouse <dwmw2@infradead.org> - 2017-09-25 20:50 +0200
      Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Casey Leedom <leedom@chelsio.com> - 2017-09-25 22:20 +0200
      Re: DMA error when sg->offset value is greater than PAGE_SIZE in  Intel IOMMU Harsh Jain <Harsh@chelsio.com> - 2017-09-26 13:20 +0200

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