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-rw-r--r--Documentation/powerpc/papr_hcalls.rst46
1 files changed, 42 insertions, 4 deletions
diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst
index 3493631a60f8..48fcf1255a33 100644
--- a/Documentation/powerpc/papr_hcalls.rst
+++ b/Documentation/powerpc/papr_hcalls.rst
@@ -220,13 +220,51 @@ from the LPAR memory.
**H_SCM_HEALTH**
| Input: drcIndex
-| Out: *health-bitmap, health-bit-valid-bitmap*
+| Out: *health-bitmap (r4), health-bit-valid-bitmap (r5)*
| Return Value: *H_Success, H_Parameter, H_Hardware*
Given a DRC Index return the info on predictive failure and overall health of
-the NVDIMM. The asserted bits in the health-bitmap indicate a single predictive
-failure and health-bit-valid-bitmap indicate which bits in health-bitmap are
-valid.
+the PMEM device. The asserted bits in the health-bitmap indicate one or more states
+(described in table below) of the PMEM device and health-bit-valid-bitmap indicate
+which bits in health-bitmap are valid. The bits are reported in
+reverse bit ordering for example a value of 0xC400000000000000
+indicates bits 0, 1, and 5 are valid.
+
+Health Bitmap Flags:
+
++------+-----------------------------------------------------------------------+
+| Bit | Definition |
++======+=======================================================================+
+| 00 | PMEM device is unable to persist memory contents. |
+| | If the system is powered down, nothing will be saved. |
++------+-----------------------------------------------------------------------+
+| 01 | PMEM device failed to persist memory contents. Either contents were |
+| | not saved successfully on power down or were not restored properly on |
+| | power up. |
++------+-----------------------------------------------------------------------+
+| 02 | PMEM device contents are persisted from previous IPL. The data from |
+| | the last boot were successfully restored. |
++------+-----------------------------------------------------------------------+
+| 03 | PMEM device contents are not persisted from previous IPL. There was no|
+| | data to restore from the last boot. |
++------+-----------------------------------------------------------------------+
+| 04 | PMEM device memory life remaining is critically low |
++------+-----------------------------------------------------------------------+
+| 05 | PMEM device will be garded off next IPL due to failure |
++------+-----------------------------------------------------------------------+
+| 06 | PMEM device contents cannot persist due to current platform health |
+| | status. A hardware failure may prevent data from being saved or |
+| | restored. |
++------+-----------------------------------------------------------------------+
+| 07 | PMEM device is unable to persist memory contents in certain conditions|
++------+-----------------------------------------------------------------------+
+| 08 | PMEM device is encrypted |
++------+-----------------------------------------------------------------------+
+| 09 | PMEM device has successfully completed a requested erase or secure |
+| | erase procedure. |
++------+-----------------------------------------------------------------------+
+|10:63 | Reserved / Unused |
++------+-----------------------------------------------------------------------+
**H_SCM_PERFORMANCE_STATS**