From: Ira Weiny <ira.weiny@intel.com>
To: Vaibhav Jain <vaibhav@linux.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: [PATCH v3] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible
Date: Sat, 8 May 2021 08:11:30 -0700 [thread overview]
Message-ID: <20210508151130.GK1904484@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20210508043642.114076-1-vaibhav@linux.ibm.com>
On Sat, May 08, 2021 at 10:06:42AM +0530, Vaibhav Jain wrote:
> Currently drc_pmem_qeury_stats() generates a dev_err in case
> "Enable Performance Information Collection" feature is disabled from
> HMC or performance stats are not available for an nvdimm. The error is
> of the form below:
>
> papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Failed to query
> performance stats, Err:-10
>
> This error message confuses users as it implies a possible problem
> with the nvdimm even though its due to a disabled/unavailable
> feature. We fix this by explicitly handling the H_AUTHORITY and
> H_UNSUPPORTED errors from the H_SCM_PERFORMANCE_STATS hcall.
>
> In case of H_AUTHORITY error an info message is logged instead of an
> error, saying that "Permission denied while accessing performance
> stats" and an EPERM error is returned back.
>
> In case of H_UNSUPPORTED error we return a EOPNOTSUPP error back from
> drc_pmem_query_stats() indicating that performance stats-query
> operation is not supported on this nvdimm.
>
> Fixes: 2d02bf835e57('powerpc/papr_scm: Fetch nvdimm performance stats from PHYP')
> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
> ---
> Changelog
>
> v3:
> * Return EOPNOTSUPP error in case of H_UNSUPPORTED [ Ira ]
> * Return EPERM in case of H_AUTHORITY [ Ira ]
> * Updated patch description
>
> v2:
> * Updated the message logged in case of H_AUTHORITY error [ Ira ]
> * Switched from dev_warn to dev_info in case of H_AUTHORITY error.
> * Instead of -EPERM return -EACCESS for H_AUTHORITY error.
> * Added explicit handling of H_UNSUPPORTED error.
> ---
> arch/powerpc/platforms/pseries/papr_scm.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
> index ef26fe40efb0..e2b69cc3beaf 100644
> --- a/arch/powerpc/platforms/pseries/papr_scm.c
> +++ b/arch/powerpc/platforms/pseries/papr_scm.c
> @@ -310,6 +310,13 @@ static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p,
> dev_err(&p->pdev->dev,
> "Unknown performance stats, Err:0x%016lX\n", ret[0]);
> return -ENOENT;
> + } else if (rc == H_AUTHORITY) {
> + dev_info(&p->pdev->dev,
> + "Permission denied while accessing performance stats");
> + return -EPERM;
> + } else if (rc == H_UNSUPPORTED) {
> + dev_dbg(&p->pdev->dev, "Performance stats unsupported\n");
> + return -EOPNOTSUPP;
> } else if (rc != H_SUCCESS) {
> dev_err(&p->pdev->dev,
> "Failed to query performance stats, Err:%lld\n", rc);
> --
> 2.31.1
>
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next prev parent reply other threads:[~2021-05-08 15:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-08 4:36 [PATCH v3] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible Vaibhav Jain
2021-05-08 15:11 ` Ira Weiny [this message]
2021-05-19 7:06 ` kajoljain
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