Out of DMA space?

Out of DMA space?

[Ben Greear]

I've been reloading the ath10k modules all afternoon, debugging issues
in my CT firmware.  I've been unloading firmware with pkts queued
in the TX logic, and they could easily not be flushable at this piont.

I just saw this...and machine hung.

DMA: Out of SW-IOMMU space for 1984 bytes at device 0000:05:00.0
ath10k_pci 0000:05:00.0: failed to refill htt rx ring: -12
DMA: Out of SW-IOMMU space for 1984 bytes at device 0000:06:00.0
ath10k_pci 0000:06:00.0: failed to refill htt rx ring: -12
DMA: Out of SW-IOMMU space for 2048 bytes at device 0000:07:00.0
DMA: Out of SW-IOMMU space for 16 bytes at device 0000:07:00.0

Just FYI really...I haven't seen this before.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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Re: Out of DMA space?

[Michal Kazior]

On 13 August 2015 at 01:16, Ben Greear <greearb@candelatech.com> wrote:
> I've been reloading the ath10k modules all afternoon, debugging issues
> in my CT firmware.  I've been unloading firmware with pkts queued
> in the TX logic, and they could easily not be flushable at this piont.
>
> I just saw this...and machine hung.
>
> DMA: Out of SW-IOMMU space for 1984 bytes at device 0000:05:00.0
> ath10k_pci 0000:05:00.0: failed to refill htt rx ring: -12
> DMA: Out of SW-IOMMU space for 1984 bytes at device 0000:06:00.0
> ath10k_pci 0000:06:00.0: failed to refill htt rx ring: -12
> DMA: Out of SW-IOMMU space for 2048 bytes at device 0000:07:00.0
> DMA: Out of SW-IOMMU space for 16 bytes at device 0000:07:00.0
>
> Just FYI really...I haven't seen this before.

I haven't seen anything like this before. Nevertheless this may
suggest there's an unbalanced DMA map-unmap in ath10k. I guess
unbalanced dma_pool and cohoerent DMA allocations combined with
kmemleak would've been detected earlier.


Michał

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