On Fri, Feb 20, 2009 at 09:39:51PM +0800, arun c wrote: > Hi all, > > I am writing a software to implement communication > over PCI. > > PCI host machine (PPC cpu) writes commands to > the PCI memory space of the (Coldfire CPU) > target device. Target device takes the command > and executes it. > > Target devices SDRAM is exposed over PCI to host. > A circular buffer residing on target memory is used > for command exchange. > > I should not allow host and target to play on the > buffer simultaneously in order to avoid corruption. > > Does anybody know how to implement a lock > suitable for this issue? > > or any lock less algorithm exists for communication > over PCI? Looks like you want two kernels to communicate with each other thru non-transparent PCI bridge. You might want to look at this: http://thread.gmane.org/gmane.linux.kernel/750865 and especially the comments from Arnd Bergmann :-) And the author also published an updated patch using virtio-net this month, you can find it on the lkml. -- 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
