<html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">Well a bit background would probably help here.<br> <br> This is useful because certain applications are hopelessly braindead and pass a CPU which they got from the driver in the first place and which is a pointer to a memory mapped BO back to the driver.<br> <br> With this IOCTL the driver is capable to handle this case gracefully and use the original BO for example as replacement for an userptr.<br> <br> Regards,<br> Christian.<br> <br> On 03.12.2015 14:02, Zhou, David(ChunMing) wrote:<br> </div> <blockquote cite="mid:CY1PR12MB019921C7571E8CBD3165A646B40D0@CY1PR12MB0199.namprd12.prod.outlook.com" type="cite"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <style type="text/css" style="display:none;"></style> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;"> <p><br> </p> <div style="color: rgb(0, 0, 0);"> <div id="divRplyFwdMsg" dir="ltr"> <div> </div> </div> <div> <div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif"> <p>UMD can find the bo by the cpu address of BO. Any comments?</p> <p><br> </p> <p>Regards,</p> <p>David Zhou<br> </p> </div> </div> </div> </div> <br> <fieldset class="mimeAttachmentHeader"></fieldset> <br> <pre wrap="">_______________________________________________ dri-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:dri-devel@lists.freedesktop.org">dri-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/dri-devel">http://lists.freedesktop.org/mailman/listinfo/dri-devel</a> </pre> </blockquote> <br> </body> </html>