Re: Assign BAR address for pci device after hotplug

[Greg KH <greg@kroah.com>]

On Tue, Aug 09, 2016 at 11:48:59AM -0700, divakar wrote:
> May be i missed one piece of information. I thought i had that in my 
> inline response but just realized i missed it. 
> 
> Device 0 ( FPGA 0), has custom logic which will detect the presence of 
> the card 1 and card 2 and controls the power switches to the same. So If 
> this makes fpga0 a "hotplug controller " then i can add the resource 
> management logic/code for devices on card 1 and card 2 to this driver. 
> Currently fpga_0 driver does some init for some of the devices on 
> itself. can i follow any hp controller driver example to do the above or 
> is there any specific driver/eg i can follow? noted your point on reading 
> the spec for the details and i am on it. 

You might get away with it for your limited hardware platform, but all
bets are off if you plug it into something else.

Again, PCI resource management is handled by the firmware/bios and the
pci hotplug controller.  You can try to fake it out, with limited
success, but really, why do you want to do so?  Just use a real machine,
that's what the pci hotplug hardware was designed for.  It's much
cheaper than trying to work around it in the end, trust me...

greg k-h