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From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>,
	linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Subject: Re: [PATCH v6 1/4] powerpc: Document details on H_SCM_HEALTH hcall
Date: Mon, 04 May 2020 14:22:58 +0530
Message-ID: <87bln4dqtx.fsf@linux.ibm.com> (raw)
In-Reply-To: <87r1w5echa.fsf@mpe.ellerman.id.au>

Thanks for looking into this patch Mpe,

Michael Ellerman <mpe@ellerman.id.au> writes:

> Vaibhav Jain <vaibhav@linux.ibm.com> writes:
>
>> Add documentation to 'papr_hcalls.rst' describing the bitmap flags
>> that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
>> specification.
>>
>> Cc: Dan Williams <dan.j.williams@intel.com>
>> Cc: Michael Ellerman <mpe@ellerman.id.au>
>> Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
>> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
>> ---
>> Changelog:
>>
>> v5..v6
>> * New patch in the series
>> ---
>>  Documentation/powerpc/papr_hcalls.rst | 43 ++++++++++++++++++++++++---
>>  1 file changed, 39 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst
>> index 3493631a60f8..9a5ba5eaf323 100644
>> --- a/Documentation/powerpc/papr_hcalls.rst
>> +++ b/Documentation/powerpc/papr_hcalls.rst
>> @@ -220,13 +220,48 @@ 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 NVDIMM. The asserted bits in the health-bitmap indicate one or more states
>> +(described in table below) of the NVDIMM and health-bit-valid-bitmap indicate
>> +which bits in health-bitmap are valid.
>> +
>> +Health Bitmap Flags:
>> +
>> ++------+-----------------------------------------------------------------------+
>> +|  Bit |               Definition                                              |
>> ++======+=======================================================================+
>> +|  00  | SCM device is unable to persist memory contents.                      |
>> +|      | If the system is powered down, nothing will be saved.                 |
>> ++------+-----------------------------------------------------------------------+
>
> Are these correct bit numbers or backward IBM big endian bit numbers?
>
> ie. which bit is LSB?
These bit numbers index to a 64-bit dword laid in IBM big endian
format. So LSB would be at the located at a higher address. For example
0xC400000000000000 indicates bits 0, 1, and 5 are valid.

>
> cheers
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  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20  7:07 [PATCH v6 0/4] powerpc/papr_scm: Add support for reporting nvdimm health Vaibhav Jain
2020-04-20  7:07 ` [PATCH v6 1/4] powerpc: Document details on H_SCM_HEALTH hcall Vaibhav Jain
2020-04-30  6:04   ` Michael Ellerman
2020-05-04  8:52     ` Vaibhav Jain [this message]
2020-04-20  7:07 ` [PATCH v6 2/4] powerpc/papr_scm: Fetch nvdimm health information from PHYP Vaibhav Jain
2020-04-30  9:11   ` Michael Ellerman
2020-04-20  7:07 ` [PATCH v6 3/4] ndctl/papr_scm,uapi: Add support for PAPR nvdimm specific methods Vaibhav Jain
2020-04-30  9:17   ` Michael Ellerman
2020-04-30 11:07     ` Vaibhav Jain
2020-04-20  7:07 ` [PATCH v6 4/4] powerpc/papr_scm: Implement support for PAPR_SCM_PDSM_HEALTH Vaibhav Jain
2020-04-29  8:19 ` [PATCH v6 0/4] powerpc/papr_scm: Add support for reporting nvdimm health Aneesh Kumar K.V

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