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From: Vaibhav Jain <>
Cc: Vaibhav Jain <>,
	"Aneesh Kumar K . V" <>,
	Michael Ellerman <>
Subject: [PATCH] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible
Date: Wed, 14 Apr 2021 18:10:26 +0530	[thread overview]
Message-ID: <> (raw)

Currently drc_pmem_qeury_stats() generates a dev_err in case
"Enable Performance Information Collection" feature is disabled from
HMC. 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 feature.

So we fix this by explicitly handling the H_AUTHORITY error from the
H_SCM_PERFORMANCE_STATS hcall and generating a warning instead of an
error, saying that "Performance stats in-accessible".

Fixes: 2d02bf835e57('powerpc/papr_scm: Fetch nvdimm performance stats from PHYP')
Signed-off-by: Vaibhav Jain <>
 arch/powerpc/platforms/pseries/papr_scm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 835163f54244..9216424f8be3 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -277,6 +277,9 @@ static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p,
 			"Unknown performance stats, Err:0x%016lX\n", ret[0]);
 		return -ENOENT;
+	} else if (rc == H_AUTHORITY) {
+		dev_warn(&p->pdev->dev, "Performance stats in-accessible");
+		return -EPERM;
 	} else if (rc != H_SUCCESS) {
 			"Failed to query performance stats, Err:%lld\n", rc);
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             reply	other threads:[~2021-04-14 12:40 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14 12:40 Vaibhav Jain [this message]
2021-04-14 15:36 ` [PATCH] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible Ira Weiny
2021-04-14 16:21   ` Vaibhav Jain
2021-04-14 21:24     ` Ira Weiny
2021-04-15 11:48       ` Vaibhav Jain
2021-04-18  7:58         ` kajoljain
2021-04-14 21:32 ` Dan Williams
2021-04-15 11:43   ` Vaibhav Jain
2021-04-15 17:03     ` Dan Williams

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