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Mon, 18 May 2020 11:08:39 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3AD9711C052; Mon, 18 May 2020 11:08:39 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5ECAF11C050; Mon, 18 May 2020 11:08:36 +0000 (GMT) Received: from vajain21-in-ibm-com (unknown [9.102.2.238]) by d06av25.portsmouth.uk.ibm.com (Postfix) with SMTP; Mon, 18 May 2020 11:08:36 +0000 (GMT) Received: by vajain21-in-ibm-com (sSMTP sendmail emulation); Mon, 18 May 2020 16:38:35 +0530 From: Vaibhav Jain To: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org Subject: [RFC PATCH 4/4] powerpc/papr_scm: Add support for PDSM GET_PERF_STAT Date: Mon, 18 May 2020 16:38:14 +0530 Message-Id: <20200518110814.145644-5-vaibhav@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518110814.145644-1-vaibhav@linux.ibm.com> References: <20200518110814.145644-1-vaibhav@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.676 definitions=2020-05-18_04:2020-05-15,2020-05-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 cotscore=-2147483648 lowpriorityscore=0 adultscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 spamscore=0 suspectscore=0 phishscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005180096 Message-ID-Hash: JCPLLB435R3TEPJVGPFK7DAJMOW2RR6I X-Message-ID-Hash: JCPLLB435R3TEPJVGPFK7DAJMOW2RR6I X-MailFrom: vaibhav@linux.ibm.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Vaibhav Jain , "Aneesh Kumar K . V" , Michael Ellerman X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit This patch adds support for retrieving a singled NVDIMM performance stat from PHYP via PDSM GET_PERF_STAT_VERSION. A new uapi 'struct nd_pdsm_get_perf_stat' is introduced that holds a single performance stat and is populated by newly introduced papr_scm_get_perf_stat() by issuing an H_SCM_PERFORMANCE_STATS to PHYP. Signed-off-by: Vaibhav Jain --- arch/powerpc/include/uapi/asm/papr_scm_pdsm.h | 12 +++ arch/powerpc/platforms/pseries/papr_scm.c | 74 +++++++++++++++++++ 2 files changed, 86 insertions(+) diff --git a/arch/powerpc/include/uapi/asm/papr_scm_pdsm.h b/arch/powerpc/include/uapi/asm/papr_scm_pdsm.h index 2db4ffdff285..473c4bbddb2f 100644 --- a/arch/powerpc/include/uapi/asm/papr_scm_pdsm.h +++ b/arch/powerpc/include/uapi/asm/papr_scm_pdsm.h @@ -116,6 +116,7 @@ enum papr_scm_pdsm { PAPR_SCM_PDSM_HEALTH, PAPR_SCM_PDSM_FETCH_PERF_STATS, PAPR_SCM_PDSM_READ_PERF_STATS, + PAPR_SCM_PDSM_GET_PERF_STAT, PAPR_SCM_PDSM_MAX, }; @@ -218,4 +219,15 @@ struct nd_pdsm_read_perf_stats_v1 { #define nd_pdsm_read_perf_stats nd_pdsm_read_perf_stats_v1 #define ND_PDSM_READ_PERF_STATS_VERSION 1 +/* + * Fetch the value of single nvdimm performance stat id of which is + * stored in 'stat.id' + */ +struct nd_pdsm_get_perf_stat_v1 { + struct nd_pdsm_perf_stat stat; +} __packed; + +#define nd_pdsm_get_perf_stat nd_pdsm_get_perf_stat_v1 +#define ND_PDSM_GET_PERF_STAT_VERSION 1 + #endif /* _UAPI_ASM_POWERPC_PAPR_SCM_PDSM_H_ */ diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 06744d7fe727..284d04f0a094 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -525,6 +525,77 @@ static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf, return 0; } +static int papr_scm_get_perf_stat(struct papr_scm_priv *p, + struct nd_pdsm_cmd_pkg *pkg) +{ + int rc; + struct nd_pdsm_get_perf_stat *stat = + (struct nd_pdsm_get_perf_stat *)pdsm_cmd_to_payload(pkg); + const size_t copysize = sizeof(struct nd_pdsm_get_perf_stat); + struct papr_scm_perf_stats *stats_req; + ssize_t stat_size; + + /* + * If the requested payload version is greater than one we know + * about, return the payload version we know about and let + * caller/userspace handle. + */ + if (pkg->payload_version > ND_PDSM_GET_PERF_STAT_VERSION) + pkg->payload_version = ND_PDSM_GET_PERF_STAT_VERSION; + + if (pkg->hdr.nd_size_out < copysize) { + dev_dbg(&p->pdev->dev, "Truncated payload (%u). Expected (%lu)", + pkg->hdr.nd_size_out, copysize); + rc = -ENOSPC; + goto out; + } + + if (!READ_ONCE(p->len_stat_buffer)) { + dev_dbg(&p->pdev->dev, "Perf stat: req for unsupported device"); + rc = -ENOENT; + goto out; + } + + /* Allocate and setup a PERFORMANCE_STATS request buffer */ + stat_size = sizeof(struct papr_scm_perf_stats) + + sizeof(struct papr_scm_perf_stat); + stats_req = kzalloc(stat_size, GFP_KERNEL); + if (!stats_req) { + dev_err(&p->pdev->dev, "Perf stat: Unable to allocate memory\n"); + rc = -ENOMEM; + goto out; + } + + /* Copy the single request statistic_id into the request buffer */ + memcpy(&stats_req->scm_statistics[0].statistic_id, &stat->stat.id, + sizeof(stats_req->scm_statistics[0].statistic_id)); + + /* Fetch the stat from PHYP */ + rc = drc_pmem_query_stats(p, stats_req, stat_size, 1, NULL); + if (rc) + goto out; + + /* Copy the value of stat to the return payload */ + memcpy(&stat->stat.id, &stats_req->scm_statistics[0].statistic_id, + sizeof(stat->stat.id)); + stat->stat.val = stats_req->scm_statistics[0].statistic_value; + + pkg->hdr.nd_fw_size = copysize; + + dev_dbg(&p->pdev->dev, "Copying payload size=%u version=0x%x\n", + pkg->hdr.nd_fw_size, pkg->payload_version); + +out: + /* + * Put the error in out package and return success from function + * so that errors if any are propogated back to userspace. + */ + pkg->cmd_status = rc; + dev_dbg(&p->pdev->dev, "completion code = %d\n", rc); + + return 0; +} + /* * Read the contents of dimm performance statistics buffer at the given * 'in_offset' and copy 'in_length' number of bytes to the pkg payload. @@ -755,6 +826,9 @@ static int papr_scm_service_pdsm(struct papr_scm_priv *p, case PAPR_SCM_PDSM_READ_PERF_STATS: return papr_scm_read_perf_stats(p, call_pkg); + case PAPR_SCM_PDSM_GET_PERF_STAT: + return papr_scm_get_perf_stat(p, call_pkg); + default: dev_dbg(&p->pdev->dev, "Unsupported PDSM request 0x%llx\n", call_pkg->hdr.nd_command); -- 2.26.2 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org