Hi! Recently I started getting multiple errors like this:
cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 cxgb3 0006:01:00.0: iommu_alloc failed, tbl c000000003067980 vaddr c000001fbdaaa882 npages 1 ... and so on This is all happening on a PPC64 "powernv" platform machine. To trigger the error state, it is enough to _flood_ ping CXGB3 card from another machine (which has Emulex 10Gb NIC + Cisco switch). Just do "ping -f 172.20.1.2" and wait 10-15 seconds. The messages are coming from arch/powerpc/kernel/iommu.c and basically mean that the driver requested more pages than the DMA window has which is normally 1GB (there could be another possible source of errors - ppc_md.tce_build callback - but on powernv platform it always succeeds). The patch after which it broke is: commit f83331bab149e29fa2c49cf102c0cd8c3f1ce9f9 Author: Santosh Rastapur <sant...@chelsio.com> Date: Tue May 21 04:21:29 2013 +0000 cxgb3: Check and handle the dma mapping errors Any quick ideas? Thanks! -- Alexey -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
