powerpc/perf/hv_{gpci, 24x7}: Add documentation of device attributes

gpci and 24x7 expose some device specific attributes. Add some
documentation for them.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
new file mode 100644
index 000000000000..3fa58c23f13b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-hv_gpci
@@ -0,0 +1,43 @@
+What:           /sys/bus/event_source/devices/hv_gpci/interface/collect_privileged
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                '0' if the hypervisor is configured to forbid access to event
+                counters being accumulated by other guests and to physical
+                domain event counters.
+                '1' if that access is allowed.
+
+What:           /sys/bus/event_source/devices/hv_gpci/interface/ga
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                0 or 1. Indicates whether we have access to "GA" events (listed
+                in arch/powerpc/perf/hv-gpci.h).
+
+What:           /sys/bus/event_source/devices/hv_gpci/interface/expanded
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                0 or 1. Indicates whether we have access to "EXPANDED" events (listed
+                in arch/powerpc/perf/hv-gpci.h).
+
+What:           /sys/bus/event_source/devices/hv_gpci/interface/lab
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                0 or 1. Indicates whether we have access to "LAB" events (listed
+                in arch/powerpc/perf/hv-gpci.h).
+
+What:           /sys/bus/event_source/devices/hv_gpci/interface/version
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                A number indicating the version of the gpci interface that the
+                hypervisor reports supporting.
+
+What:           /sys/bus/event_source/devices/hv_gpci/interface/kernel_version
+Date:           February 2014
+Contact:        Cody P Schafer <cody@linux.vnet.ibm.com>
+Description:
+                A number indicating the latest version of the gpci interface
+                that the kernel is aware of.