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Mon, 22 Jun 2020 04:25:17 +0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05M4PFNO10289588 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Jun 2020 04:25:15 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E0F7542045; Mon, 22 Jun 2020 04:25:14 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5428642041; Mon, 22 Jun 2020 04:25:08 +0000 (GMT) Received: from vajain21-in-ibm-com (unknown [9.199.35.228]) by d06av24.portsmouth.uk.ibm.com (Postfix) with SMTP; Mon, 22 Jun 2020 04:25:08 +0000 (GMT) Received: by vajain21-in-ibm-com (sSMTP sendmail emulation); Mon, 22 Jun 2020 09:55:07 +0530 From: Vaibhav Jain To: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org Subject: [PATCH 2/2] powerpc/papr_scm: Add support for fetching nvdimm 'fuel-gauge' metric Date: Mon, 22 Jun 2020 09:54:51 +0530 Message-Id: <20200622042451.22448-3-vaibhav@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200622042451.22448-1-vaibhav@linux.ibm.com> References: <20200622042451.22448-1-vaibhav@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-22_01:2020-06-19, 2020-06-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 mlxscore=0 cotscore=-2147483648 phishscore=0 malwarescore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006220030 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Santosh Sivaraj , Oliver O'Halloran , "Aneesh Kumar K . V" , Vaibhav Jain , Dan Williams Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" We add support for reporting 'fuel-gauge' NVDIMM metric via PAPR_PDSM_HEALTH pdsm payload. 'fuel-gauge' metric indicates the usage life remaining of a papr-scm compatible NVDIMM. PHYP exposes this metric via the H_SCM_PERFORMANCE_STATS. The metric value is returned from the pdsm by extending the return payload 'struct nd_papr_pdsm_health' without breaking the ABI. A new field 'dimm_fuel_gauge' to hold the metric value is introduced at the end of the payload struct and its presence is indicated by by extension flag PDSM_DIMM_HEALTH_RUN_GAUGE_VALID. The patch introduces a new function papr_pdsm_fuel_gauge() that is called from papr_pdsm_health(). If fetching NVDIMM performance stats is supported then 'papr_pdsm_fuel_gauge()' allocated an output buffer large enough to hold the performance stat and passes it to drc_pmem_query_stats() that issues the HCALL to PHYP. The return value of the stat is then populated in the 'struct nd_papr_pdsm_health.dimm_fuel_gauge' field with extension flag 'PDSM_DIMM_HEALTH_RUN_GAUGE_VALID' set in 'struct nd_papr_pdsm_health.extension_flags' Signed-off-by: Vaibhav Jain --- arch/powerpc/include/uapi/asm/papr_pdsm.h | 9 +++++ arch/powerpc/platforms/pseries/papr_scm.c | 47 +++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h index 9ccecc1d6840..50ef95e2f5b1 100644 --- a/arch/powerpc/include/uapi/asm/papr_pdsm.h +++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h @@ -72,6 +72,11 @@ #define PAPR_PDSM_DIMM_CRITICAL 2 #define PAPR_PDSM_DIMM_FATAL 3 +/* struct nd_papr_pdsm_health.extension_flags field flags */ + +/* Indicate that the 'dimm_fuel_gauge' field is valid */ +#define PDSM_DIMM_HEALTH_RUN_GAUGE_VALID 1 + /* * Struct exchanged between kernel & ndctl in for PAPR_PDSM_HEALTH * Various flags indicate the health status of the dimm. @@ -84,6 +89,7 @@ * dimm_locked : Contents of the dimm cant be modified until CEC reboot * dimm_encrypted : Contents of dimm are encrypted. * dimm_health : Dimm health indicator. One of PAPR_PDSM_DIMM_XXXX + * dimm_fuel_gauge : Life remaining of DIMM as a percentage from 0-100 */ struct nd_papr_pdsm_health { union { @@ -96,6 +102,9 @@ struct nd_papr_pdsm_health { __u8 dimm_locked; __u8 dimm_encrypted; __u16 dimm_health; + + /* Extension flag PDSM_DIMM_HEALTH_RUN_GAUGE_VALID */ + __u16 dimm_fuel_gauge; }; __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE]; }; diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index cb3f9acc325b..39527cd38d9c 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -506,6 +506,45 @@ static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf, return 0; } +static int papr_pdsm_fuel_gauge(struct papr_scm_priv *p, + union nd_pdsm_payload *payload) +{ + int rc, size; + struct papr_scm_perf_stat *stat; + struct papr_scm_perf_stats *stats; + + /* Silently fail if fetching performance metrics isn't supported */ + if (!p->len_stat_buffer) + return 0; + + /* Allocate request buffer enough to hold single performance stat */ + size = sizeof(struct papr_scm_perf_stats) + + sizeof(struct papr_scm_perf_stat); + + stats = kzalloc(size, GFP_KERNEL); + if (!stats) + return -ENOMEM; + + stat = &stats->scm_statistic[0]; + memcpy(&stat->statistic_id, "MemLife ", sizeof(stat->statistic_id)); + stat->statistic_value = 0; + + /* Fetch the fuel gauge and populate it in payload */ + rc = drc_pmem_query_stats(p, stats, size, 1, NULL); + if (!rc) { + dev_dbg(&p->pdev->dev, + "Fetched fuel-gauge %llu", stat->statistic_value); + payload->health.extension_flags |= + PDSM_DIMM_HEALTH_RUN_GAUGE_VALID; + payload->health.dimm_fuel_gauge = stat->statistic_value; + + rc = sizeof(struct nd_papr_pdsm_health); + } + + kfree(stats); + return rc; +} + /* Fetch the DIMM health info and populate it in provided package. */ static int papr_pdsm_health(struct papr_scm_priv *p, union nd_pdsm_payload *payload) @@ -546,6 +585,14 @@ static int papr_pdsm_health(struct papr_scm_priv *p, /* struct populated hence can release the mutex now */ mutex_unlock(&p->health_mutex); + + /* Populate the fuel gauge meter in the payload */ + rc = papr_pdsm_fuel_gauge(p, payload); + + /* Error fetching fuel gauge is not fatal */ + if (rc < 0) + dev_dbg(&p->pdev->dev, "Err(%d) fetching fuel gauge\n", rc); + rc = sizeof(struct nd_papr_pdsm_health); out: -- 2.26.2