Re: Blocking access to a PCI device for "a long time"?

From: Benjamin Herrenschmidt
Date: Sat Nov 20 2004 - 19:36:39 EST



> - Make sure that nothing can get confused by the device "going away" on
> the PCI/AGP bus, using whatever kernel locks are necessary
> - Save PCI config state of device
> - Instruct the FPGA to reload itself
> - Wait many, many, many, many milliseconds
> - Reload PCI config state
> - Unlock and continue
>
> Other drivers accessing the bus for other devices is PROBABLY not a
> problem, but nothing can touch the GPU while it's reloading.
>
> Are there any problems with this approach that would make it a really
> bad idea?

You should read the thread called [PATCH 1/2] pci: Block config access
during BIST where a similar issues with proposed solution is discussed.

Ben.


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