Yinghai Lu <yinghai <at> kernel.org> writes: > > On Mon, Jun 11, 2012 at 12:32 PM, Tom Carr <tkcarr03873 <at> gmail.com> wrote: > > > > Yinghai, sorry about the direct email on Friday, I tried to reply back to > > the > > newsgroup but the send kept failing. Your suggestion worked but only if > > there > > were no drivers attached to the endpoints. If I load the driver for the > > endpoint > > at bus 6.0 and 9.0, then load the empty FPGA at bus 8.0, which is off of > > 4.8, > > and write 1 to /sys/bus/pci/remove the system crashes. Is there a > > requirement that all down stream devices be removed? I could not find any > > such > > requirement in any documentation. Here is the most of the stack trace. > > can you please try current linus kernel like > 3.4 or 3.5-rc1 ? > > looks like there is some stop/remove pci device code bug in old kernel. > > Thanks > > Yinghai > Yinghai, thank you for the help. Moving to 3.4 fixed the problem. I am now able to load the FPGA and bring the FPGA endpoint online using remove and rescan. I was curious if it would be possible to instruct the root complex port to allocate enough memory to deal with endpoints that come on line after the system is booted. With the solution I have now, the drivers for all the endpoints in the PCIe tree starting at the root port 1.2 have to be removed which means if they have to stop processing while the rescan is done. Since this is an embedded design, the endpoints and the memory they will use does not change. If the root could be instructed to allocate enough memory to deal with endpoints coming in later then only the switch port connected to the endpoint would need to be removed and the other endpoints should be able to continue to function. If you think this is doable and of value to others, I would be willing to make the change and offer it up for consideration. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
