On 19/01/16 13:11, Tomasz Nowicki wrote: > Following ACPI spec: > On systems supporting GICv3 and above, GICR Base Address in MADT GICC > structure holds the 64-bit physical address of the associated Redistributor. > If all of the GIC Redistributors are in the always-on power domain, > GICR structures should be used to describe the Redistributors instead, > and this field must be set to 0. > > It means that we have two ways to initialize registirbutors map. > 1. via GICD structure which can accommodate many redistributors as a region > 2. via GICC which is able to describe single redistributor > > This patch is going to add support for second option. > Considering redistributors, GICD and GICC subtables have be mutually > exclusive. While discovering and mapping redistributor, we need to know > its size in advance. For the GICC case, redistributor can be in > a power-domain that is off, thus we cannot relay on GICR TYPER register. > Therefore, we get GIC version from distributor register and map 2xSZ_64K > for GICv3 and 4xSZ_64K for GICv4. > > Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> > Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx> This is incredibly convoluted, but I'm not sure there is a better way given the current ACPI API. Still, it hurts. Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
