From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-nvdimm <linux-nvdimm@lists.01.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH v8 1/5] powerpc: Document details on H_SCM_HEALTH hcall
Date: Fri, 29 May 2020 00:54:55 +0530 [thread overview]
Message-ID: <87o8q7lv5k.fsf@linux.ibm.com> (raw)
In-Reply-To: <CAPcyv4jXp1FocSe-fFBA_00TnsjPudrBCuHBfv+zwHA_R0353A@mail.gmail.com>
Thanks for looking into this patchset Dan,
Dan Williams <dan.j.williams@intel.com> writes:
> On Tue, May 26, 2020 at 9:13 PM Vaibhav Jain <vaibhav@linux.ibm.com> wrote:
>>
>> Add documentation to 'papr_hcalls.rst' describing the bitmap flags
>> that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
>> specification.
>>
>
> Please do a global s/SCM/PMEM/ or s/SCM/NVDIMM/. It's unfortunate that
> we already have 2 ways to describe persistent memory devices, let's
> not perpetuate a third so that "grep" has a chance to find
> interrelated code across architectures. Other than that this looks
> good to me.
Sure, will use PAPR_NVDIMM instead of PAPR_SCM for new code being
introduced. However certain identifiers like H_SCM_HEALTH are taken from
the papr specificiation hence need to use the same name.
>
>> 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>
>> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
>> ---
>> Changelog:
>> v7..v8:
>> * Added a clarification on bit-ordering of Health Bitmap
>>
>> Resend:
>> * None
>>
>> v6..v7:
>> * None
>>
>> v5..v6:
>> * New patch in the series
>> ---
>> Documentation/powerpc/papr_hcalls.rst | 45 ++++++++++++++++++++++++---
>> 1 file changed, 41 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst
>> index 3493631a60f8..45063f305813 100644
>> --- a/Documentation/powerpc/papr_hcalls.rst
>> +++ b/Documentation/powerpc/papr_hcalls.rst
>> @@ -220,13 +220,50 @@ 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. 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 | SCM device is unable to persist memory contents. |
>> +| | If the system is powered down, nothing will be saved. |
>> ++------+-----------------------------------------------------------------------+
>> +| 01 | SCM device failed to persist memory contents. Either contents were not|
>> +| | saved successfully on power down or were not restored properly on |
>> +| | power up. |
>> ++------+-----------------------------------------------------------------------+
>> +| 02 | SCM device contents are persisted from previous IPL. The data from |
>> +| | the last boot were successfully restored. |
>> ++------+-----------------------------------------------------------------------+
>> +| 03 | SCM device contents are not persisted from previous IPL. There was no |
>> +| | data to restore from the last boot. |
>> ++------+-----------------------------------------------------------------------+
>> +| 04 | SCM device memory life remaining is critically low |
>> ++------+-----------------------------------------------------------------------+
>> +| 05 | SCM device will be garded off next IPL due to failure |
>> ++------+-----------------------------------------------------------------------+
>> +| 06 | SCM contents cannot persist due to current platform health status. A |
>> +| | hardware failure may prevent data from being saved or restored. |
>> ++------+-----------------------------------------------------------------------+
>> +| 07 | SCM device is unable to persist memory contents in certain conditions |
>> ++------+-----------------------------------------------------------------------+
>> +| 08 | SCM device is encrypted |
>> ++------+-----------------------------------------------------------------------+
>> +| 09 | SCM device has successfully completed a requested erase or secure |
>> +| | erase procedure. |
>> ++------+-----------------------------------------------------------------------+
>> +|10:63 | Reserved / Unused |
>> ++------+-----------------------------------------------------------------------+
>>
>> **H_SCM_PERFORMANCE_STATS**
>>
>> --
>> 2.26.2
>>
--
Cheers
~ Vaibhav
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
next prev parent reply other threads:[~2020-05-28 19:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 4:12 [PATCH v8 0/5] powerpc/papr_scm: Add support for reporting nvdimm health Vaibhav Jain
2020-05-27 4:12 ` [PATCH v8 1/5] powerpc: Document details on H_SCM_HEALTH hcall Vaibhav Jain
2020-05-27 18:56 ` Dan Williams
2020-05-28 19:24 ` Vaibhav Jain [this message]
2020-05-27 4:12 ` [PATCH v8 2/5] seq_buf: Export seq_buf_printf Vaibhav Jain
2020-06-01 12:01 ` Vaibhav Jain
2020-06-01 13:48 ` Steven Rostedt
2020-06-01 14:46 ` Vaibhav Jain
2020-05-27 4:12 ` [PATCH v8 3/5] powerpc/papr_scm: Fetch nvdimm health information from PHYP Vaibhav Jain
2020-05-27 9:54 ` Aneesh Kumar K.V
2020-05-27 4:12 ` [PATCH v8 4/5] ndctl/papr_scm,uapi: Add support for PAPR nvdimm specific methods Vaibhav Jain
2020-05-27 9:55 ` Aneesh Kumar K.V
2020-05-27 4:12 ` [PATCH v8 5/5] powerpc/papr_scm: Implement support for PAPR_SCM_PDSM_HEALTH Vaibhav Jain
2020-05-27 9:55 ` Aneesh Kumar K.V
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87o8q7lv5k.fsf@linux.ibm.com \
--to=vaibhav@linux.ibm.com \
--cc=aneesh.kumar@linux.ibm.com \
--cc=dan.j.williams@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).