[PATCH v3 00/10] Add sysfs interface files to hv_gpci device to expose system information

[Kajol Jain]

The hcall H_GET_PERF_COUNTER_INFO can be used to get data related to
chips, dimms and system topology, by passing different counter request
values.
Patchset adds sysfs files to "/sys/devices/hv_gpci/interface/"
of hv_gpci pmu driver, which will expose system topology information
using H_GET_PERF_COUNTER_INFO hcall. The added sysfs files are
available for power10 and above platforms and needs root access
to read the data.

Patches 1,3,5,7,9 adds sysfs interface files to the hv_gpci
pmu driver, to get system topology information.

List of added sysfs files:
-> processor_bus_topology (Counter request value : 0xD0)
-> processor_config (Counter request value : 0x90)
-> affinity_domain_via_virtual_processor (Counter request value : 0xA0)
-> affinity_domain_via_domain (Counter request value : 0xB0)
-> affinity_domain_via_partition (Counter request value : 0xB1)

Patches 2,4,6,8,10 adds details of the newly added hv_gpci
interface files listed above in the ABI documentation.

Patches 2,4,6,8,10 adds details of the newly added hv_gpci
interface files listed above in the ABI documentation.

Changelog:
v2 -> v3
-> Make nit changes in documentation patches as suggested by Randy Dunlap.

v1 -> v2
-> Incase the HCALL fails with errors that can be resolve during runtime,
   then only add sysinfo interface attributes to the interface_attrs
   attribute array. Even if one of the counter request value HCALL fails,
   don't add any sysinfo attribute to the interface_attrs attribute array.
   Add the code changes to make sure sysinfo interface added only when all
   the requirements met as suggested by Michael Ellerman.
-> Make changes in documentation, adds detail of errors type
   which can be resolved at runtime as suggested by Michael Ellerman.
-> Add new enum and sysinfo_counter_request array to get required
   counter request value in hv-gpci.c file.
-> Move the macros for interface attribute array index to hv-gpci.c, as
   these macros currently only used in hv-gpci.c file.

Kajol Jain (10):
  powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show
    processor bus topology information
  docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document
    processor_bus_topology sysfs interface file
  powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show
    processor config information
  docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document
    processor_config sysfs interface file
  powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity
    domain via virtual processor information
  docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document
    affinity_domain_via_virtual_processor sysfs interface file
  powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity
    domain via domain information
  docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document
    affinity_domain_via_domain sysfs interface file
  powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity
    domain via partition information
  docs: ABI: sysfs-bus-event_source-devices-hv_gpci: Document
    affinity_domain_via_partition sysfs interface file

 .../sysfs-bus-event_source-devices-hv_gpci    | 160 +++++
 arch/powerpc/perf/hv-gpci.c                   | 640 +++++++++++++++++-
 2 files changed, 798 insertions(+), 2 deletions(-)

-- 
2.39.3