Hello Russell, On Tue, 29 Sep 2015 18:10:54 +0100, Russell King - ARM Linux wrote:
> > In the current kernel implementation, the outer cache flush range > > operation is triggered by the dma_alloc function. > > This operation can be take place during runtime and in some > > circumstances may lead to the PCIe/PL310 deadlock on Armada 375/38x > > SoCs. > > I wonder if that's what's causing the sporadic lockups I'm seeing on > 38x with a SATA PCIe card - it happens at a very specific point during > boot while initialising the SATA card, right down to the kernel message > character that it stops at. It might very well be the case. If there's enough PCIe traffic and a PL310 cache maintenance operation happening at the same time, the system will lockup. I'm a bit surprised that just the initialization of the PCIe card generates enough traffic to trigger the deadlock, but maybe I'm underestimating the problem. Best regards, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
