On Mon, Oct 31, 2016 at 10:18:25AM -0600, Tejun Heo wrote: > Hello, > > On Sat, Oct 29, 2016 at 11:40:29PM -0400, Andrew Ryder wrote: > > I have some disks attached to a "Silicon Image, Inc. SiI 3124 PCI-X Serial > > ATA Controller" and it repeatedly locks up the system with the message > > whenever there is heavy disk i/o. The system the controller is attached to > > is a via EPIA-M910 board. > > > > sata_sil24: 0000:06:03.0: swiotlb buffer is full: 65536 bytes) > > DMA: Out of SW-IOMMU space for 65536 bytes at device .." > > sata_sil24 0000:06:03.0: swiotlb buffer is full (sz: 65536 bytes .." > > > > For the past week I have been running with two additional boot parameters > > (iommu=allowdac swiotlb=131072) which seem to have solved the issue, but I > > was curious if this is a driver bug or not? Usually it means that the device (sta_sil24) can only handle certain DMA addresses and hence needs the assistance of the bounce buffers (swiotlb). Increasing the number of them is the right way to make it work. I would call this hardware limitation - if you provide the lspci -n -s 06:03.0 one can look in the driver and see where it sets the DMA mask. > > (cc'ing swiotbl maintainer, hi!) > > That looks like iotlb area running out. I don't think there's much to > be done from driver side and we've traditionally been pretty bad at > handling iotlb errors. Konrad, do you have any ideas? > > Thanks. > > -- > tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
