Re: [PATCH V9 0/8] powerpc/devtree: Add support for 2 new DRC properties

[Michael Bringmann <mwb@linux.vnet.ibm.com>]

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On 12/07/2016 01:13 AM, Michael Bringmann wrote:
> Several properties in the DRC device tree format are replaced by
> more compact representations to allow, for example, for the encoding
> of vast amounts of memory, and or reduced duplication of information
> in related data structures.
> 
> "ibm,drc-info": This property, when present, replaces the following
> four properties: "ibm,drc-indexes", "ibm,drc-names", "ibm,drc-types"
> and "ibm,drc-power-domains".  This property is defined for all
> dynamically reconfigurable platform nodes.  The "ibm,drc-info" elements
> are intended to provide a more compact representation, and reduce some
> search overhead.
> 
> "ibm,dynamic-memory-v2": This property replaces the "ibm,dynamic-memory"
> node representation within the "ibm,dynamic-reconfiguration-memory"
> property provided by the BMC.  This element format is intended to provide
> a more compact representation of memory, especially, for systems with
> massive amounts of RAM.  To simplify portability, this property is
> converted to the "ibm,dynamic-memory" property during system boot.
> 
> "ibm,architecture.vec": Bidirectional communication mechanism between
> the host system and the front end processor indicating what features
> the host system supports and what features the front end processor will
> actually provide.  In this case, we are indicating that the host system
> can support the new device tree structures "ibm,drc-info" and
> "ibm,dynamic-memory-v2".
> 
> Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
> 
> Michael Bringmann (8):
>   powerpc/firmware: Add definitions for new firmware features.
>   powerpc/memory: Parse new memory property to register blocks.
>   powerpc/memory: Parse new memory property to initialize structures.
>   pseries/hotplug init: Convert new DRC memory property for hotplug runtime
>   pseries/drc-info: Search new DRC properties for CPU indexes
>   hotplug/drc-info: Add code to search new devtree properties
>   powerpc: Check arch.vec earlier during boot for memory features
>   powerpc: Enable support for new DRC devtree properties
> ---
> Changes in V9:
>   -- Various code cleanup measures
> 
>  arch/powerpc/include/asm/firmware.h             |    5 -
>  arch/powerpc/include/asm/prom.h                 |   38 ++++
>  arch/powerpc/kernel/prom.c                      |  103 ++++++++++--
>  arch/powerpc/kernel/prom_init.c                 |    3 
>  arch/powerpc/mm/numa.c                          |  168 ++++++++++++++++---
>  arch/powerpc/platforms/pseries/firmware.c       |    2 
>  arch/powerpc/platforms/pseries/pseries_energy.c |  202 ++++++++++++++++++++---
>  drivers/pci/hotplug/rpadlpar_core.c             |   13 +
>  drivers/pci/hotplug/rpaphp.h                    |    4 
>  drivers/pci/hotplug/rpaphp_core.c               |  108 +++++++++---
>  10 files changed, 543 insertions(+), 103 deletions(-)
> 
> 

-- 
Michael W. Bringmann
Linux Technology Center
IBM Corporation
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External: (512) 286-5196
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mwb@linux.vnet.ibm.com