ask for help about swiotlb buffer is full

[Kefeng Wang]

+cc linux-arm-kernel at lists.infradead.org

On 2015-01-30 18:08, Kefeng Wang wrote:
> Hi all,
> 
>   There is an AHCI compliant SATA controller in our arm64 soc, and it only supports 32bit DMA(used coherent dma_ops).
> It works well in v3.16. Recently, we update kernel from linux v3.16 to linux v3.19-rc4(use defconfig in arm64),
> but we get errors when test sata driver, as follows.
> 
> ------------------------------------------------------------------------------
> ahci b1002800.sata: swiotlb buffer is full (sz: 65536 bytes)
> DMA: Out of SW-IOMMU space for 65536 bytes at device b1002800.sata
> ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> ata6.00: failed command: WRITE DMA EXT
> ata6.00: cmd 35/00:0f:05:0d:00/00:38:00:00:00/e0 tag 7 dma 7347712 out
>          res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x40 (internal error)
> ata6.00: status: { DRDY }
> ata6.00: configured for UDMA/133
> ata6: EH complete
> -------------------------------------------------------------------------------
> 
> It's difficult for us to git bisect, could anyone give us some advise, and idea?
> 
> Thanks
> Kefeng
>