Messages in this thread | | | Date | Thu, 11 Dec 2014 16:50:30 -0800 | Subject | Fwd: dma_alloc_coherent allocates same dma address for VF Queue's | From | Kallol Biswas <> |
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Hi, I am trying to bring up a SR-IOV capable device. It seems that the routine dma_alloc_coherent returns the DMA address for VF that has been allocated for PF.
For PF: 241.005637] XXX: ffff880851576600 [ 241.005911] XXX: dmadev ffff881053344098 cqes ffff88084a7ed000 cq_dma_addr 0xfffff000 [ 241.005917] XXX: dmadev ffff881053344098 sq_cmds ffff880850062000 sq_dma_addr 0xffffe000
FOR VF:
[ 242.208847] XXX: ffff880851574600 [ 242.208868] XXX 0000:01:08.0: enabling device (0000 -> 0002) [ 242.208975] XXX: dmadev ffff88085108f098 cqes ffff8808507c6000 cq_dma_addr 0xfffff000 [ 242.208979] XXX: dmadev ffff88085108f098 sq_cmds ffff88084a4dd000 sq_dma_addr 0xffffe000
Most likely the device returns wrong information to OS when I enable VFs.
I have been looking at live kernel memory with the command crash and trying to understand intel DMA mapping code. If anyone has any input kindly send a reply.
Thanks, Kallol
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