• Jesse Larrew's avatar
    powerpc/pseries: Update CPU maps when device tree is updated · 5d88aa85
    Jesse Larrew authored
    Platform events such as partition migration or the new PRRN firmware
    feature can cause the NUMA characteristics of a CPU to change, and these
    changes will be reflected in the device tree nodes for the affected
    CPUs.
    
    This patch registers a handler for Open Firmware device tree updates
    and reconfigures the CPU and node maps whenever the associativity
    changes. Currently, this is accomplished by marking the affected CPUs in
    the cpu_associativity_changes_mask and allowing
    arch_update_cpu_topology() to retrieve the new associativity information
    using hcall_vphn().
    
    Protecting the NUMA cpu maps from concurrent access during an update
    operation will be addressed in a subsequent patch in this series.
    Signed-off-by: default avatarNathan Fontenot <nfont@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    5d88aa85
prom.h 5.66 KB