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powerpc: Document details on H_SCM_HEALTH hcall 

Add documentation to 'papr_hcalls.rst' describing the bitmap flags
that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
specification.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Acked-by: Ira Weiny <ira.weiny@intel.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20200615124407.32596-2-vaibhav@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Vaibhav Jain 2020-06-15 18:14:02 +05:30 коммит произвёл Dan Williams
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Коммит 901e34905a
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46
Documentation/powerpc/papr_hcalls.rst
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@ -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**