From patchwork Sat May 29 07:38:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: kajoljain X-Patchwork-Id: 12287717 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 708076D17 for ; Sat, 29 May 2021 07:39:08 +0000 (UTC) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 14T7YJZs094112; Sat, 29 May 2021 03:38:59 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=kNoOEmtusQTyic1il7jei2LAhzCYlACTQx9uFhX8dbA=; b=rUl6vXre8M0IdDY8kqAHX9tAZlmnyNCONOC/kNwDKNCzUu2yvKymLtZR2K+iybvsEe5Q gaNIeIbY45ZO/jWr0kqGPRnWb2WslZWY9n0405cup0+uqGpN90O6+x5FyoVIE5nafHub csPDCNutN2R3q4huiMMPbl8pkOib55JRdI0TDpirqliOTJImANQ3i1PmxpKDJzQTl1pG nHPNQXsxwrf3PRNzn8fiL/AhStdMpJYgldjZs3weLhlpOl6B3f4zVcj3VnMMz2UTcqYj +5MSe1MN2ZfDISAtmJdwVG7SHP/yMIhD+04MJpRtn1KgDf8YR5GksHHnhU6Chzb7rkYS sw== Received: from ppma03ams.nl.ibm.com (62.31.33a9.ip4.static.sl-reverse.com [169.51.49.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 38uh27ga9y-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 29 May 2021 03:38:59 -0400 Received: from pps.filterd (ppma03ams.nl.ibm.com [127.0.0.1]) by ppma03ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 14T7cMbi001290; Sat, 29 May 2021 07:38:57 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma03ams.nl.ibm.com with ESMTP id 38ud88825y-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 29 May 2021 07:38:57 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 14T7csX626476812 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 29 May 2021 07:38:54 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 801E04C040; Sat, 29 May 2021 07:38:54 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CB5AF4C044; Sat, 29 May 2021 07:38:50 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.199.45.117]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Sat, 29 May 2021 07:38:50 +0000 (GMT) From: Kajol Jain To: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, peterz@infradead.org Cc: maddy@linux.vnet.ibm.com, santosh@fossix.org, aneesh.kumar@linux.ibm.com, vaibhav@linux.ibm.com, dan.j.williams@intel.com, ira.weiny@intel.com, atrajeev@linux.vnet.ibm.com, tglx@linutronix.de, kjain@linux.ibm.com, rnsastry@linux.ibm.com Subject: [RFC v3 3/4] powerpc/papr_scm: Add perf interface support Date: Sat, 29 May 2021 13:08:27 +0530 Message-Id: <20210529073828.1542292-4-kjain@linux.ibm.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210529073828.1542292-1-kjain@linux.ibm.com> References: <20210529073828.1542292-1-kjain@linux.ibm.com> X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: f1std8z5L7YiOPT4-Y61MThO---iFXq8 X-Proofpoint-ORIG-GUID: f1std8z5L7YiOPT4-Y61MThO---iFXq8 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-05-29_03:2021-05-27,2021-05-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 spamscore=0 impostorscore=0 clxscore=1015 mlxscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105290058 Performance monitoring support for papr-scm nvdimm devices via perf interface is added which includes addition of pmu functions like add/del/read/event_init for nvdimm_pmu struture. A new parameter 'priv' in added to the pdev_archdata structure to save nvdimm_pmu device pointer, to handle the unregistering of pmu device. papr_scm_pmu_register function populates the nvdimm_pmu structure with events, attribute groups along with event handling functions. Finally the populated nvdimm_pmu structure is passed to register the pmu device. Event handling functions internally uses hcall to get events and counter data. Result in power9 machine with 2 nvdimm device: Ex: List all event by perf list command:# perf list nmem nmem0/cchrhcnt/ [Kernel PMU event] nmem0/cchwhcnt/ [Kernel PMU event] nmem0/critrscu/ [Kernel PMU event] nmem0/ctlresct/ [Kernel PMU event] nmem0/ctlrestm/ [Kernel PMU event] nmem0/fastwcnt/ [Kernel PMU event] nmem0/hostlcnt/ [Kernel PMU event] nmem0/hostldur/ [Kernel PMU event] nmem0/hostscnt/ [Kernel PMU event] nmem0/hostsdur/ [Kernel PMU event] nmem0/medrcnt/ [Kernel PMU event] nmem0/medrdur/ [Kernel PMU event] nmem0/medwcnt/ [Kernel PMU event] nmem0/medwdur/ [Kernel PMU event] nmem0/memlife/ [Kernel PMU event] nmem0/noopstat/ [Kernel PMU event] nmem0/ponsecs/ [Kernel PMU event] nmem1/cchrhcnt/ [Kernel PMU event] nmem1/cchwhcnt/ [Kernel PMU event] nmem1/critrscu/ [Kernel PMU event] ... nmem1/noopstat/ [Kernel PMU event] nmem1/ponsecs/ [Kernel PMU event] Signed-off-by: Kajol Jain --- arch/powerpc/include/asm/device.h | 5 + arch/powerpc/platforms/pseries/papr_scm.c | 358 ++++++++++++++++++++++ 2 files changed, 363 insertions(+) diff --git a/arch/powerpc/include/asm/device.h b/arch/powerpc/include/asm/device.h index 219559d65864..47ed639f3b8f 100644 --- a/arch/powerpc/include/asm/device.h +++ b/arch/powerpc/include/asm/device.h @@ -48,6 +48,11 @@ struct dev_archdata { struct pdev_archdata { u64 dma_mask; + /* + * Pointer to nvdimm_pmu structure, to handle the unregistering + * of pmu device + */ + void *priv; }; #endif /* _ASM_POWERPC_DEVICE_H */ diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index ef26fe40efb0..a54ce9063ac8 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -18,6 +18,8 @@ #include #include #include +#include +#include #define BIND_ANY_ADDR (~0ul) @@ -67,6 +69,8 @@ #define PAPR_SCM_PERF_STATS_EYECATCHER __stringify(SCMSTATS) #define PAPR_SCM_PERF_STATS_VERSION 0x1 +#define to_nvdimm_pmu(_pmu) container_of(_pmu, struct nvdimm_pmu, pmu) + /* Struct holding a single performance metric */ struct papr_scm_perf_stat { u8 stat_id[8]; @@ -116,6 +120,12 @@ struct papr_scm_priv { /* length of the stat buffer as expected by phyp */ size_t stat_buffer_len; + + /* array to have event_code and stat_id mappings */ + char **nvdimm_events_map; + + /* count of supported events */ + u32 total_events; }; static int papr_scm_pmem_flush(struct nd_region *nd_region, @@ -329,6 +339,347 @@ static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p, return 0; } +PMU_FORMAT_ATTR(event, "config:0-4"); + +static struct attribute *nvdimm_pmu_format_attr[] = { + &format_attr_event.attr, + NULL, +}; + +static struct attribute_group nvdimm_pmu_format_group = { + .name = "format", + .attrs = nvdimm_pmu_format_attr, +}; + +static int papr_scm_pmu_get_value(struct perf_event *event, struct device *dev, u64 *count) +{ + struct papr_scm_perf_stat *stat; + struct papr_scm_perf_stats *stats; + struct papr_scm_priv *p = (struct papr_scm_priv *)dev->driver_data; + int rc, size; + + /* Allocate request buffer enough to hold single performance stat */ + size = sizeof(struct papr_scm_perf_stats) + + sizeof(struct papr_scm_perf_stat); + + if (!p || !p->nvdimm_events_map) + return -EINVAL; + + stats = kzalloc(size, GFP_KERNEL); + if (!stats) + return -ENOMEM; + + stat = &stats->scm_statistic[0]; + memcpy(&stat->stat_id, + p->nvdimm_events_map[event->attr.config - 1], + sizeof(stat->stat_id)); + stat->stat_val = 0; + + rc = drc_pmem_query_stats(p, stats, 1); + if (rc < 0) { + kfree(stats); + return rc; + } + + *count = be64_to_cpu(stat->stat_val); + kfree(stats); + return 0; +} + +static int papr_scm_pmu_event_init(struct perf_event *event) +{ + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu); + struct papr_scm_priv *p; + + if (!nd_pmu) + return -EINVAL; + + /* test the event attr type for PMU enumeration */ + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* it does not support event sampling mode */ + if (is_sampling_event(event)) + return -EOPNOTSUPP; + + /* no branch sampling */ + if (has_branch_stack(event)) + return -EOPNOTSUPP; + + p = (struct papr_scm_priv *)nd_pmu->dev->driver_data; + if (!p) + return -EINVAL; + + /* Invalid eventcode */ + if (event->attr.config == 0 || event->attr.config > p->total_events) + return -EINVAL; + + return 0; +} + +static int papr_scm_pmu_add(struct perf_event *event, int flags) +{ + u64 count; + int rc; + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu); + + if (!nd_pmu) + return -EINVAL; + + if (flags & PERF_EF_START) { + rc = papr_scm_pmu_get_value(event, nd_pmu->dev, &count); + if (rc) + return rc; + + local64_set(&event->hw.prev_count, count); + } + + return 0; +} + +static void papr_scm_pmu_read(struct perf_event *event) +{ + u64 prev, now; + int rc; + struct nvdimm_pmu *nd_pmu = to_nvdimm_pmu(event->pmu); + + if (!nd_pmu) + return; + + rc = papr_scm_pmu_get_value(event, nd_pmu->dev, &now); + if (rc) + return; + + prev = local64_xchg(&event->hw.prev_count, now); + local64_add(now - prev, &event->count); +} + +static void papr_scm_pmu_del(struct perf_event *event, int flags) +{ + papr_scm_pmu_read(event); +} + +static ssize_t device_show_string(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct perf_pmu_events_attr *d; + + d = container_of(attr, struct perf_pmu_events_attr, attr); + + return sysfs_emit(buf, "%s\n", (char *)d->event_str); +} + +static char *strtolower(char *updated_name) +{ + int i = 0; + + while (updated_name[i]) { + if (isupper(updated_name[i])) + updated_name[i] = tolower(updated_name[i]); + i++; + } + updated_name[i] = '\0'; + return strim(updated_name); +} + +/* device_str_attr_create : Populate event "name" and string "str" in attribute */ +static struct attribute *device_str_attr_create_(char *name, char *str) +{ + struct perf_pmu_events_attr *attr; + + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + + if (!attr) + return NULL; + + sysfs_attr_init(&attr->attr.attr); + attr->event_str = str; + attr->attr.attr.name = strtolower(name); + attr->attr.attr.mode = 0444; + attr->attr.show = device_show_string; + + return &attr->attr.attr; +} + +static int papr_scm_pmu_check_events(struct papr_scm_priv *p, struct nvdimm_pmu *nd_pmu) +{ + struct papr_scm_perf_stat *stat; + struct papr_scm_perf_stats *stats, *single_stats; + int index, size, rc, count; + u32 available_events; + struct attribute **events; + char *eventcode, *eventname, *statid; + struct attribute_group *nvdimm_pmu_events_group; + + if (!p->stat_buffer_len) + return -ENOENT; + + available_events = (p->stat_buffer_len - sizeof(struct papr_scm_perf_stats)) + / sizeof(struct papr_scm_perf_stat); + + /* Allocate memory for events attribute group */ + nvdimm_pmu_events_group = kzalloc(sizeof(*nvdimm_pmu_events_group), GFP_KERNEL); + if (!nvdimm_pmu_events_group) + return -ENOMEM; + + /* Allocate the buffer for phyp where stats are written */ + stats = kzalloc(p->stat_buffer_len, GFP_KERNEL); + if (!stats) { + rc = -ENOMEM; + goto out_nvdimm_pmu_events_group; + } + + /* Allocate memory to nvdimm_event_map */ + p->nvdimm_events_map = kcalloc(available_events, sizeof(char *), GFP_KERNEL); + if (!p->nvdimm_events_map) { + rc = -ENOMEM; + goto out_stats; + } + + /* Called to get list of events supported */ + rc = drc_pmem_query_stats(p, stats, 0); + if (rc) + goto out_nvdimm_events_map; + + /* Allocate buffer to hold single performance stat */ + size = sizeof(struct papr_scm_perf_stats) + sizeof(struct papr_scm_perf_stat); + + single_stats = kzalloc(size, GFP_KERNEL); + if (!single_stats) { + rc = -ENOMEM; + goto out_nvdimm_events_map; + } + + events = kzalloc(available_events * sizeof(struct attribute *), GFP_KERNEL); + if (!events) { + rc = -ENOMEM; + goto out_single_stats; + } + + for (index = 0, stat = stats->scm_statistic, count = 0; + index < available_events; index++, ++stat) { + + single_stats->scm_statistic[0] = *stat; + rc = drc_pmem_query_stats(p, single_stats, 1); + + if (rc < 0) { + pr_info("Event not supported %s for device %s\n", + stat->stat_id, nvdimm_name(p->nvdimm)); + } else { + eventcode = kasprintf(GFP_KERNEL, "event=0x%x", count + 1); + eventname = kzalloc(strlen(stat->stat_id) + 1, GFP_KERNEL); + statid = kzalloc(strlen(stat->stat_id) + 1, GFP_KERNEL); + + if (!eventname || !statid || !eventcode) + goto out; + + strcpy(eventname, stat->stat_id); + events[count] = device_str_attr_create_(eventname, + eventcode); + if (!events[count]) + goto out; + + strcpy(statid, stat->stat_id); + p->nvdimm_events_map[count] = statid; + count++; + continue; +out: + kfree(eventcode); + kfree(eventname); + kfree(statid); + } + } + + if (!count) + goto out_events; + + events[count] = NULL; + p->nvdimm_events_map[count] = NULL; + p->total_events = count; + + nvdimm_pmu_events_group->name = "events"; + nvdimm_pmu_events_group->attrs = events; + + /* Fill attribute groups for the nvdimm pmu device */ + nd_pmu->attr_groups[NVDIMM_PMU_FORMAT_ATTR] = &nvdimm_pmu_format_group; + nd_pmu->attr_groups[NVDIMM_PMU_EVENT_ATTR] = nvdimm_pmu_events_group; + nd_pmu->attr_groups[NVDIMM_PMU_NULL_ATTR] = NULL; + + kfree(single_stats); + kfree(stats); + return 0; + +out_events: + kfree(events); +out_single_stats: + kfree(single_stats); +out_nvdimm_events_map: + kfree(p->nvdimm_events_map); +out_stats: + kfree(stats); +out_nvdimm_pmu_events_group: + kfree(nvdimm_pmu_events_group); + return rc; +} + +/* Function to free the attr_groups which are dynamically allocated */ +static void papr_scm_pmu_mem_free(struct nvdimm_pmu *nd_pmu) +{ + if (nd_pmu) { + if (nd_pmu->attr_groups[NVDIMM_PMU_EVENT_ATTR]) + kfree(nd_pmu->attr_groups[NVDIMM_PMU_EVENT_ATTR]->attrs); + kfree(nd_pmu->attr_groups[NVDIMM_PMU_EVENT_ATTR]); + } +} + +static void papr_scm_pmu_register(struct papr_scm_priv *p) +{ + struct nvdimm_pmu *nd_pmu; + int rc; + + nd_pmu = kzalloc(sizeof(*nd_pmu), GFP_KERNEL); + if (!nd_pmu) { + rc = -ENOMEM; + goto pmu_err_print; + } + + rc = papr_scm_pmu_check_events(p, nd_pmu); + if (rc) + goto pmu_check_events_err; + + nd_pmu->name = nvdimm_name(p->nvdimm); + nd_pmu->event_init = papr_scm_pmu_event_init; + nd_pmu->read = papr_scm_pmu_read; + nd_pmu->add = papr_scm_pmu_add; + nd_pmu->del = papr_scm_pmu_del; + + rc = register_nvdimm_pmu(nd_pmu, p->pdev); + if (rc) + goto pmu_register_err; + + /* + * Set archdata.priv value to nvdimm_pmu structure, to handle the + * unregistering of pmu device. + */ + p->pdev->archdata.priv = nd_pmu; + return; + +pmu_register_err: + papr_scm_pmu_mem_free(nd_pmu); + kfree(p->nvdimm_events_map); +pmu_check_events_err: + kfree(nd_pmu); +pmu_err_print: + dev_info(&p->pdev->dev, "nvdimm pmu didn't register rc=%d\n", rc); +} + +static void papr_scm_pmu_uninit(struct nvdimm_pmu *nd_pmu) +{ + unregister_nvdimm_pmu(nd_pmu); + papr_scm_pmu_mem_free(nd_pmu); + kfree(nd_pmu); +} + /* * Issue hcall to retrieve dimm health info and populate papr_scm_priv with the * health information. @@ -1177,6 +1528,7 @@ static int papr_scm_probe(struct platform_device *pdev) goto err2; platform_set_drvdata(pdev, p); + papr_scm_pmu_register(p); return 0; @@ -1195,6 +1547,12 @@ static int papr_scm_remove(struct platform_device *pdev) nvdimm_bus_unregister(p->bus); drc_pmem_unbind(p); + + if (pdev->archdata.priv) + papr_scm_pmu_uninit(pdev->archdata.priv); + + pdev->archdata.priv = NULL; + kfree(p->nvdimm_events_map); kfree(p->bus_desc.provider_name); kfree(p);