From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org
Cc: Santosh Sivaraj <santosh@fossix.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Vaibhav Jain <vaibhav@linux.ibm.com>,
Dan Williams <dan.j.williams@intel.com>,
Ira Weiny <ira.weiny@intel.com>
Subject: [PATCH v2] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible
Date: Thu, 6 May 2021 00:46:06 +0530 [thread overview]
Message-ID: <20210505191606.51666-1-vaibhav@linux.ibm.com> (raw)
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". Also '-EACCES' error is return instead of -EPERM.
In case of H_UNSUPPORTED error we return a -EPERM 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>
---
Changelog
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..12f1513f0fca 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 -EACCES;
+ } else if (rc == H_UNSUPPORTED) {
+ dev_dbg(&p->pdev->dev, "Performance stats unsupported\n");
+ return -EPERM;
} else if (rc != H_SUCCESS) {
dev_err(&p->pdev->dev,
"Failed to query performance stats, Err:%lld\n", rc);
--
2.31.1
next reply other threads:[~2021-05-05 19:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-05 19:16 Vaibhav Jain [this message]
2021-05-06 4:58 ` [PATCH v2] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible Ira Weiny
2021-05-07 12:18 ` Vaibhav Jain
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