[PATCH v2 1/11] Expose pseries devicetree_update()

[Paul Mackerras]

On Mon, Mar 25, 2013 at 01:51:38PM -0500, Nathan Fontenot wrote:
> From: Jesse Larrew <jlarrew at linux.vnet.ibm.com>
> 
> Newer firmware on Power systems can transparently reassign platform resources
> (CPU and Memory) in use. For instance, if a processor or memory unit is
> predicted to fail, the platform may transparently move the processing to an
> equivalent unused processor or the memory state to an equivalent unused
> memory unit. However, reassigning resources across NUMA boundaries may alter
> the performance of the partition. When such reassignment is necessary, the
> Platform Resource Reassignment Notification (PRRN) option provides a
> mechanism to inform the Linux kernel of changes to the NUMA affinity of
> its platform resources.
> 
> When rtasd receives a PRRN event, it needs to make a series of RTAS
> calls (ibm,update-nodes and ibm,update-properties) to retrieve the
> updated device tree information. These calls are already handled in the
> pseries_devtree_update() routine used in partition migration.
> 
> This patch simply exposes pseries_devicetree_update() so it can be
> called by rtasd. pseries_devicetree_update() and supporting functions
> are also modified to take a 32-bit 'scope' parameter. This parameter is
> required by the ibm,update-nodes/ibm,update-properties RTAS calls, and
> the appropriate value is contained within the RTAS event for PRRN
> notifications. In pseries_devicetree_update() it was previously
> hard-coded to 1, the scope value for partition migration.
> 
> Signed-off-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>

Acked-by: Paul Mackerras <paulus at samba.org>