On Mon, Jul 30, 2018 at 01:28:14PM +0000, David Laight wrote: > From: Lukas Wunner > > Sent: 28 July 2018 19:32 > ... > > Finally, if the card was quickly swapped and the link to the new > > card is already up, you may be accessing that new card. (mmio > > accesses may then still return all ones if the BARs are blank, > > but at least config space accesses should work.) > > On my i7-7700 system that no longer works (at least with some cards). > If I take the PCIe link down completely (reset the FPGA on the card) > it doesn't recover (loops through detect active/quiet and a third > state I can't quite remember). > > ISTR that it recovers from the link going down when I short out > the PCIe data lines. > > It worked fine on a XEON E5-2609 system - I did it a lot when > updating the fpga image. > > Can anyone else verify whether this works on other systems? > Or whether the kernel (or BIOS) needs to (re-)initialise > some register to make link recovery work. Huh? Can you be a bit more specific what exactly no longer works and which branch or kernel version introduced the regression? Thanks, Lukas
