P-SeriesのトピックIOMMU disable in kernel https://community.nxp.com/t5/P-Series/IOMMU-disable-in-kernel/m-p/888355#M4622 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>We have P2041RDB with DDC 1553 (Muxbus) PCIe card inside. In order to enable DMA mode of the card, the vendor&nbsp;requests&nbsp;to disable IOMMU support in the Linux kernel. The question is, what the impact of the IOMMU disabling?&nbsp;</P><P></P><P>Thanks</P></BODY></HTML> Mon, 21 Jan 2019 06:47:21 GMT emintz 2019-01-21T06:47:21Z IOMMU disable in kernel https://community.nxp.com/t5/P-Series/IOMMU-disable-in-kernel/m-p/888355#M4622 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>We have P2041RDB with DDC 1553 (Muxbus) PCIe card inside. In order to enable DMA mode of the card, the vendor&nbsp;requests&nbsp;to disable IOMMU support in the Linux kernel. The question is, what the impact of the IOMMU disabling?&nbsp;</P><P></P><P>Thanks</P></BODY></HTML> Mon, 21 Jan 2019 06:47:21 GMT https://community.nxp.com/t5/P-Series/IOMMU-disable-in-kernel/m-p/888355#M4622 emintz 2019-01-21T06:47:21Z Re: IOMMU disable in kernel https://community.nxp.com/t5/P-Series/IOMMU-disable-in-kernel/m-p/888356#M4623 <HTML><HEAD></HEAD><BODY><P><SPAN style="font-size: 10.0pt; color: #51626f;">Hello <A _jive_internal="true" data-content-finding="Community" data-userid="248953" data-username="emintz" href="https://community.nxp.com/people/emintz">Eli Mintz</A> ,</SPAN></P><P><SPAN style="font-size: 10.0pt;">&nbsp;</SPAN></P><P><SPAN style="color: #51626f; font-size: 10.0pt; ">PAMU(IOMMU) is used for hypervisor case. Typically, a <STRONG>PAMU</STRONG> resides astride the boundary between the coherency and I/O domains. <BR /> </SPAN></P><P></P><P><SPAN style="color: #51626f; font-size: 10.0pt; ">The FSL DPAA QBMAN drivers have an explicit dependency (for stashing) on the <STRONG>PAMU</STRONG> driver. </SPAN></P><P><SPAN style="color: #51626f; font-size: 10.0pt; ">If you <STRONG>disable</STRONG> PAMU, then there would be issues with QBMAN drivers.</SPAN></P><P></P><P><BR />Have a great day,<BR />TIC</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 01 Feb 2019 08:03:20 GMT https://community.nxp.com/t5/P-Series/IOMMU-disable-in-kernel/m-p/888356#M4623 yipingwang 2019-02-01T08:03:20Z