Hi all, a problem first that occurred in 3.2 is still in a problem 3.3rc1 See http://lists.linuxfoundation.org/pipermail/iommu/2012-January/003438.html As Chris Wright pointed out there's probably something in the MMC DMA handling missing when IOMMU is enabled. I can send new logs like this from the latest 3.3rc1 ... [ 44.508118] mmc0: error -110 whilst initialising MMC card [ 44.604237] mmc0: error -110 whilst initialising MMC card [ 44.711132] DRHD: handling fault status reg 3 [ 44.711199] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.711202] DMAR:[fault reason 02] Present bit in context entry is clear [ 44.711226] mmc0: card is mmc v4 but doesn't support any high-speed modes. [ 44.711495] mmc0: power class selection to bus width 4 failed [ 44.711996] DRHD: handling fault status reg 3 [ 44.712058] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.712060] DMAR:[fault reason 02] Present bit in context entry is clear [ 44.712093] mmc0: new MMC card at address 0001 [ 44.722460] mmcblk0: mmc0:0001 000000 30.6 MiB [ 44.724100] DRHD: handling fault status reg 2 [ 44.724165] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.724168] DMAR:[fault reason 02] Present bit in context entry is clear [ 44.724363] DRHD: handling fault status reg 3 [ 44.724430] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.724433] DMAR:[fault reason 02] Present bit in context entry is clear [ 44.724667] mmcblk0: unknown partition table [ 44.729817] DRHD: handling fault status reg 3 [ 44.729882] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.729884] DMAR:[fault reason 02] Present bit in context entry is clear [ 44.730088] DRHD: handling fault status reg 3 (..) [ 44.825656] DRHD: handling fault status reg 3 [ 44.829802] DMAR:[DMA Write] Request device [03:00.0] fault addr fffff000 [ 44.829805] DMAR:[fault reason 02] Present bit in context entry is clear [ 47.952259] mmc0: card 0001 removed And also with IOMMU disabled if it helps. Regards, Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
